A system and equipment for detecting the contact resistance and temperature of a battery.

Abstract

This application provides a battery contact impedance and temperature detection system and device. The detection system includes: a battery positive terminal, a battery negative terminal, a first aluminum sheet welded to the battery positive terminal and having a first hole, a second aluminum sheet welded to the battery negative terminal and having a second hole, a first screw passing through the first hole and a first OT terminal, a first nut screwed to the first screw, a second screw passing through the second hole and a second OT terminal, a second nut screwed to the second screw, a first temperature sensor disposed on the first OT terminal, a second temperature sensor disposed on the second OT terminal, a detection device for determining the battery contact impedance, a Hall current acquisition circuit, and a power module. The detection device, by combining the acquired temperature values ​​of the first OT terminal, the acquired temperature values ​​of the second OT terminal, and the obtained battery contact impedance, determines the location of the abnormal point in the battery's charging and discharging circuit.

Description

Technical Field

[0001] This application relates to the field of battery testing technology, and in particular to a system and equipment for testing the contact resistance and temperature of a battery. Background Technology

[0002] CN102879744A provides a method for detecting or monitoring battery parameters such as internal resistance, overvoltage, undervoltage, and overtemperature.

[0003] In actual battery testing, for ease of testing, the battery testing equipment connects to the battery terminals via aluminum sheets welded to the terminals, and the OT terminals connected to these aluminum sheets are manually connected to the terminals or aluminum sheets using bolts. However, poor welding between the aluminum sheets and terminals, oxidation of the aluminum sheets leading to poor contact, human error causing loose connections between the OT terminals and aluminum sheets, and vibration can all cause abnormalities in the charging and discharging circuit. If these abnormalities persist, they can lead to severe overheating of the battery terminals and damage to the battery terminals and related components in the circuit. Currently, there is no effective solution in existing technology to detect these persistent abnormalities or pinpoint their location. Failure to detect these abnormalities in a timely manner can result in unusable test data or the risk of thermal damage due to battery overheating. Summary of the Invention

[0004] To address the aforementioned technical problems, this application provides a battery contact impedance and temperature detection system and device. The detection device is used to determine the location of abnormal points in the battery's charging and discharging circuit by combining the collected temperature values ​​of the first OT terminal, the collected temperature values ​​of the second OT terminal, the first contact impedance, and the second contact impedance. The abnormal point locations include: between the first aluminum sheet and the first OT terminal, between the battery positive terminal and the first aluminum sheet, between the first OT terminal and the cable used to connect the power module, between the second aluminum sheet and the second OT terminal, between the battery negative terminal and the second aluminum sheet, or between the second OT terminal and the cable used to connect the power module.

[0005] In a first aspect, this application provides a system for detecting the contact resistance and temperature of a battery, comprising:

[0006] The battery comprises a positive terminal, a negative terminal, a first aluminum sheet welded to the positive terminal and having a first hole, a second aluminum sheet welded to the negative terminal and having a second hole, a first screw passing through the first hole and a first OT terminal, a first nut screwed to the first screw, a second screw passing through the second hole and a second OT terminal, a second nut screwed to the second screw, a first temperature sensor disposed on the first OT terminal for collecting the temperature value of the first OT terminal, a second temperature sensor disposed on the second OT terminal for collecting the temperature value of the second OT terminal, a detection device for determining the contact impedance of the battery including a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, and a fifth connection terminal, a Hall current acquisition circuit, and a power module. The battery includes: a positive terminal and a negative terminal.

[0007] A first screw passing through the first hole and the first OT terminal is screwed to the first nut so that the first aluminum sheet abuts against the first OT terminal; a second screw passing through the second hole and the second OT terminal is screwed to the second nut so that the second aluminum sheet abuts against the second OT terminal.

[0008] The first connection terminal is connected to the first end of the first OT terminal and the first conductive port of the first aluminum sheet respectively. The first end of the first OT terminal is also connected to the power module through a Hall current acquisition circuit for acquiring current. The Hall current acquisition circuit is also connected to the third connection terminal. The fourth connection terminal is connected to the first temperature sensor. The second connection terminal is connected to the second end of the second OT terminal and the second conductive port of the second aluminum sheet respectively. The fifth connection terminal is connected to the second temperature sensor.

[0009] The contact impedance of the battery includes: the first contact impedance between the first end of the first OT terminal and the first conductive port of the first aluminum sheet, and the second contact impedance between the second end of the second OT terminal and the second conductive port of the second aluminum sheet;

[0010] The detection equipment is used to determine the location of the abnormal point in the battery's charging and discharging circuit by combining the collected temperature values ​​of the first OT terminal and the second OT terminal, the calculated first contact impedance, and the calculated second contact impedance. The abnormal point locations include: between the first aluminum plate and the first OT terminal, between the battery positive terminal and the first aluminum plate, between the first OT terminal and the cable used to connect the power module, between the second aluminum plate and the second OT terminal, between the battery negative terminal and the second aluminum plate, or between the second OT terminal and the cable used to connect the power module. The battery's charging and discharging circuit includes: the battery positive terminal, the battery negative terminal, the first aluminum plate, the second aluminum plate, the first OT terminal, the second OT terminal, and the power module.

[0011] In conjunction with the first aspect, in one optional implementation, the Hall current acquisition circuit is disposed between the first end of the first OT terminal and the power module to acquire the current flowing between the first end of the first OT terminal and the power module.

[0012] The first connection terminal of the detection device is connected to the first end of the first OT terminal and the first conductive port of the first aluminum sheet respectively, so as to collect the first voltage flowing through the positive terminal of the battery, and combine the collected current flowing between the first end of the first OT terminal and the power module to determine the first contact impedance between the first end of the first OT terminal and the first conductive port of the first aluminum sheet.

[0013] The second connection terminal of the detection device is connected to the second end of the second OT terminal and the second conductive port of the second aluminum sheet respectively, so as to collect the second voltage flowing through the negative terminal of the battery. Combined with the current flowing between the first end of the first OT terminal and the power module, the second contact impedance between the second end of the second OT terminal and the second conductive port of the second aluminum sheet is determined.

[0014] The first temperature sensor, located on the first OT terminal, is connected to the fourth connection terminal of the detection device to transmit the collected temperature value of the first OT terminal to the detection device. The second temperature sensor, located on the second OT terminal, is connected to the fifth connection terminal of the detection device to transmit the collected temperature value of the second OT terminal to the detection device.

[0015] In conjunction with the first aspect, in one optional embodiment, the detection device is used to obtain the current flowing between the first end of the first OT terminal and the power module, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal, and the collected temperature value of the second OT terminal through the first connection terminal, the second connection terminal, the third connection terminal, the fourth connection terminal, and the fifth connection terminal, and to display the current flowing between the first end of the first OT terminal and the power module, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal, and the collected temperature value of the second OT terminal through a display screen on the detection device.

[0016] In conjunction with the first aspect, in one optional implementation, the detection device is specifically used for:

[0017] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery, and the temperature value of the second OT terminal collected is taken as the second temperature of the negative terminal of the battery.

[0018] Determine if the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, the positive terminal temperature of the battery is determined to be abnormal. Determine if the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, the negative terminal temperature of the battery is determined to be abnormal.

[0019] In conjunction with the first aspect, in one alternative implementation, the detection device is further specifically used for:

[0020] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery.

[0021] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery positive terminal is determined to be between the first aluminum sheet and the first OT terminal in the battery's charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the first aluminum sheet and the first OT terminal.

[0022] In conjunction with the first aspect, in one alternative implementation, the detection device is further specifically used for:

[0023] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery.

[0024] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery positive terminal is determined to be between the battery positive terminal and the first aluminum sheet in the battery charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the battery positive terminal and the first aluminum sheet. Alternatively, the abnormal point causing the abnormal temperature of the battery positive terminal is determined to be between the first OT terminal and the cable used to connect the power module in the battery charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the first OT terminal and the cable used to connect the power module.

[0025] In conjunction with the first aspect, in one alternative implementation, the detection device is further specifically used for:

[0026] The temperature value of the second OT terminal collected is used as the second temperature of the battery negative terminal.

[0027] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal is determined to be between the second aluminum sheet and the second OT terminal in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal is caused by poor contact between the second aluminum sheet and the second OT terminal.

[0028] In conjunction with the first aspect, in one alternative implementation, the detection device is further specifically used for:

[0029] The temperature value of the second OT terminal collected is used as the second temperature of the battery negative terminal.

[0030] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal is determined to be between the battery negative terminal and the second aluminum sheet in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal is caused by poor contact between the battery negative terminal and the second aluminum sheet, or...

[0031] The abnormal point causing the abnormal temperature of the battery negative terminal was determined to be between the second OT terminal and the cable used to connect the power module in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal was caused by poor contact between the second OT terminal and the cable used to connect the power module.

[0032] In conjunction with the first aspect, in one optional implementation, the detection device is also connected to the central control unit via WIFI, Bluetooth, or cable to upload the unique code of the battery with abnormal positive terminal temperature or abnormal negative terminal temperature to the central control unit.

[0033] In conjunction with the first aspect, in an optional implementation, the detection device is further used for:

[0034] The temperature of the positive terminal of the battery is periodically collected, the temperature of the negative terminal of the battery is collected, the current flowing between the first end of the first OT terminal and the power module is collected, the first contact impedance and the second contact impedance are calculated, and the unique code of the battery with abnormal positive terminal temperature or abnormal negative terminal temperature is periodically uploaded to the central control computer connected to the detection equipment.

[0035] Secondly, this application provides a device for detecting the contact resistance and temperature of a battery, comprising:

[0036] The system includes a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, a fifth connection terminal, a display screen, and an MCU chip for determining the contact impedance of the battery. The battery includes a positive terminal and a negative terminal.

[0037] The first connection terminal is connected to the first end of the first OT terminal and the first conductive port of the first aluminum sheet respectively. The first end of the first OT terminal is also connected to the power module through a Hall current acquisition circuit for acquiring current. The Hall current acquisition circuit is also connected to the third connection terminal. The fourth connection terminal is connected to the first temperature sensor disposed on the first OT terminal for acquiring the temperature value of the first OT terminal. The second connection terminal is connected to the second end of the second OT terminal and the second conductive port of the second aluminum sheet respectively. The fifth connection terminal is connected to the second temperature sensor disposed on the second OT terminal for acquiring the temperature value of the second OT terminal.

[0038] The first aluminum sheet is welded to the positive terminal of the battery and has a first hole. A first screw and a first nut are screwed through the first hole and the first OT terminal so that the first aluminum sheet abuts against the first OT terminal. The second aluminum sheet is welded to the negative terminal of the battery and has a second hole. A second screw and a second nut are screwed through the second hole and the second OT terminal so that the second aluminum sheet abuts against the second OT terminal.

[0039] The contact impedance of the battery includes: the first contact impedance between the first end of the first OT terminal and the first conductive port of the first aluminum sheet, and the second contact impedance between the second end of the second OT terminal and the second conductive port of the second aluminum sheet;

[0040] The MCU chip is used to determine the location of the abnormal point in the battery's charging and discharging circuit by combining the collected temperature values ​​of the first OT terminal and the second OT terminal, the first contact impedance, and the second contact impedance. The abnormal point locations include: between the first aluminum plate and the first OT terminal, between the battery positive terminal and the first aluminum plate, between the first OT terminal and the cable used to connect the power module, between the second aluminum plate and the second OT terminal, between the battery negative terminal and the second aluminum plate, or between the second OT terminal and the cable used to connect the power module. The battery's charging and discharging circuit includes: the battery positive terminal, the battery negative terminal, the first aluminum plate, the second aluminum plate, the first OT terminal, the second OT terminal, and the power module.

[0041] In conjunction with the second aspect, in one optional implementation, the Hall current acquisition circuit is disposed between the first end of the first OT terminal and the power module to acquire the current flowing between the first end of the first OT terminal and the power module.

[0042] The first connection terminal is connected to the first end of the first OT terminal and the first conductive port of the first aluminum sheet respectively, so as to collect the first voltage flowing through the positive terminal of the battery, and combine the collected current flowing between the first end of the first OT terminal and the power module to determine the first contact impedance between the first end of the first OT terminal and the first conductive port of the first aluminum sheet.

[0043] The second connection terminal is connected to the second end of the second OT terminal and the second conductive port of the second aluminum sheet respectively, so as to collect the second voltage flowing through the negative terminal of the battery. Combined with the current flowing between the first end of the first OT terminal and the power module, the second contact impedance between the second end of the second OT terminal and the second conductive port of the second aluminum sheet is determined.

[0044] A first temperature sensor, located on the first OT terminal, is connected to a fourth connection terminal to transmit the collected temperature value from the first OT terminal to the MCU chip.

[0045] The second temperature sensor, located on the second OT terminal, is connected to the fifth connection terminal to transmit the collected temperature value of the second OT terminal to the MCU chip.

[0046] In conjunction with the second aspect, in one optional embodiment, the display screen is used to display the current flowing between the first end of the first OT terminal and the power module, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal, and the collected temperature value of the second OT terminal.

[0047] In conjunction with the second aspect, in one optional implementation, the MCU chip is specifically used for:

[0048] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery, and the temperature value of the second OT terminal collected is taken as the second temperature of the negative terminal of the battery.

[0049] Determine if the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, the positive terminal temperature of the battery is determined to be abnormal. Determine if the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, the negative terminal temperature of the battery is determined to be abnormal.

[0050] In conjunction with the second aspect, in one alternative implementation, the MCU chip is further specifically used for:

[0051] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery.

[0052] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery positive terminal is determined to be between the first aluminum sheet and the first OT terminal in the battery's charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the first aluminum sheet and the first OT terminal.

[0053] In conjunction with the second aspect, in one alternative implementation, the MCU chip is further specifically used for:

[0054] The temperature value of the first OT terminal collected is taken as the first temperature of the positive terminal of the battery.

[0055] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery positive terminal is determined to be between the battery positive terminal and the first aluminum sheet in the battery charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the battery positive terminal and the first aluminum sheet. Alternatively, the abnormal point causing the abnormal temperature of the battery positive terminal is determined to be between the first OT terminal and the cable used to connect the power module in the battery charging and discharging circuit, and the abnormal temperature of the battery positive terminal is caused by poor contact between the first OT terminal and the cable used to connect the power module.

[0056] In conjunction with the second aspect, in one alternative implementation, the MCU chip is further specifically used for:

[0057] The temperature value of the second OT terminal collected is used as the second temperature of the battery negative terminal.

[0058] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal is determined to be between the second aluminum sheet and the second OT terminal in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal is caused by poor contact between the second aluminum sheet and the second OT terminal.

[0059] In conjunction with the second aspect, in one alternative implementation, the MCU chip is further specifically used for:

[0060] The temperature value of the second OT terminal collected is used as the second temperature of the battery negative terminal.

[0061] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal is determined to be between the battery negative terminal and the second aluminum sheet in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal is caused by poor contact between the battery negative terminal and the second aluminum sheet, or...

[0062] The abnormal point causing the abnormal temperature of the battery negative terminal was determined to be between the second OT terminal and the cable used to connect the power module in the battery's charging and discharging circuit, and the abnormal temperature of the battery negative terminal was caused by poor contact between the second OT terminal and the cable used to connect the power module.

[0063] In conjunction with the second aspect, in one optional implementation, the temperature of the positive terminal of the battery, the temperature of the negative terminal of the battery, and the current flowing between the first end of the first OT terminal and the power module are periodically collected by the Hall current acquisition circuit. The first contact impedance and the second contact impedance are calculated by the MCU chip. The unique code of the battery with abnormal positive terminal temperature or abnormal negative terminal temperature is periodically uploaded to the central control computer.

[0064] This application provides a system and device for detecting the contact impedance and temperature of a battery. The detection system includes: a positive terminal of the battery, a negative terminal of the battery, a first aluminum sheet welded to the positive terminal of the battery and having a first hole, a second aluminum sheet welded to the negative terminal of the battery and having a second hole, a first screw passing through the first hole and a first OT terminal, a first nut screwed to the first screw, a second screw passing through the second hole and a second OT terminal, a second nut screwed to the second screw, a first temperature sensor disposed on the first OT terminal for collecting the temperature value of the first OT terminal, a second temperature sensor disposed on the second OT terminal for collecting the temperature value of the second OT terminal, a detection device including a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, and a fifth connection terminal for determining the contact impedance of the battery, a Hall current acquisition circuit, and a power module. The battery includes: a positive terminal of the battery and a negative terminal of the battery.

[0065] A first screw passing through the first hole and the first OT terminal is screwed to the first nut so that the first aluminum sheet abuts against the first OT terminal; a second screw passing through the second hole and the second OT terminal is screwed to the second nut so that the second aluminum sheet abuts against the second OT terminal.

[0066] The first connection terminal is connected to the first end of the first OT terminal and the first conductive port of the first aluminum sheet respectively. The first end of the first OT terminal is also connected to the power module through a Hall current acquisition circuit for acquiring current. The Hall current acquisition circuit is also connected to the third connection terminal. The fourth connection terminal is connected to the first temperature sensor. The second connection terminal is connected to the second end of the second OT terminal and the second conductive port of the second aluminum sheet respectively. The fifth connection terminal is connected to the second temperature sensor.

[0067] The contact impedance of the battery includes: the first contact impedance between the first end of the first OT terminal and the first conductive port of the first aluminum sheet, and the second contact impedance between the second end of the second OT terminal and the second conductive port of the second aluminum sheet;

[0068] The detection equipment is used to determine the location of abnormal points in the battery's charging and discharging circuit by combining the collected temperature values ​​of the first OT terminal and the second OT terminal, the first contact impedance, and the second contact impedance. The abnormal point locations include: between the first aluminum plate and the first OT terminal, between the battery positive terminal and the first aluminum plate, between the first OT terminal and the cable used to connect the power module, between the second aluminum plate and the second OT terminal, between the battery negative terminal and the second aluminum plate, or between the second OT terminal and the cable used to connect the power module. The battery's charging and discharging circuit includes: the battery positive terminal, the battery negative terminal, the first aluminum plate, the second aluminum plate, the first OT terminal, the second OT terminal, and the power module.

[0069] Using this application, the detection equipment can determine the location of abnormal points in the battery's charging and discharging circuit by combining the collected temperature values ​​of the first OT terminal and the second OT terminal, the first contact impedance, and the second contact impedance. The abnormal point locations include: between the first aluminum sheet and the first OT terminal; between the battery positive terminal and the first aluminum sheet; between the first OT terminal and the cable used to connect the power module; between the second aluminum sheet and the second OT terminal; between the battery negative terminal and the second aluminum sheet; or between the second OT terminal and the cable used to connect the power module. In other words, the detection equipment can promptly detect abnormalities in the battery's charging and discharging circuit and their locations. Attached Figure Description

[0070] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0071] Figure 1 This is a schematic diagram of a battery contact resistance and temperature detection system provided in this application;

[0072] Figure 2 This is a schematic diagram of a battery contact resistance and temperature detection device provided in this application;

[0073] 10-Detection equipment, 101-First connection terminal, 102-Second connection terminal, 103-Third connection terminal, 104-Fourth connection terminal, 105-Fifth connection terminal, 106-MCU chip, 107-Display screen, 20-Battery, 201-Battery positive terminal, 202-Battery negative terminal, 30-Power module, 40-Hall current acquisition circuit, 401-First temperature sensor, 402-Second temperature sensor, 501-First screw, 502-Second screw, 601-First OT terminal, 602-Second OT terminal, 701-First aluminum sheet, 702-Second aluminum sheet, 801-First nut, 802-Second nut. Detailed Implementation

[0074] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0075] It should be noted that the terms "first," "second," "third," "fourth," and "fifth" in this application are only used to distinguish different connection ends, holes, screws, nuts, aluminum sheets, temperature sensors, OT terminals, contact impedances, conductive ports, etc., and have no other meaning, and should not limit the scope of protection of this application.

[0076] See Figure 1 This is a schematic diagram of a battery contact resistance and temperature detection system provided in this application, as shown below. Figure 1 As shown, specifically, the detection system may include, but is not limited to:

[0077] Battery positive terminal 201, battery negative terminal 202, a first aluminum sheet 701 welded to the battery positive terminal 201 and having a first hole, a second aluminum sheet 702 welded to the battery negative terminal 202 and having a second hole, passing through the first hole and the first OT (Output) terminal. The device includes a first screw 501 for the terminal, a first nut 801 screwed to the first screw 501, a second screw 502 passing through the second hole and the second OT terminal 602, a second nut 802 screwed to the second screw 502, a first temperature sensor 401 disposed on the first OT terminal 601 for collecting the temperature value of the first OT terminal 601, a second temperature sensor 402 disposed on the second OT terminal 602 for collecting the temperature value of the second OT terminal 602, a detection device 10 for determining the contact impedance of the battery 20 including a first connection terminal 101, a second connection terminal 102, a third connection terminal 103, a fourth connection terminal 104 and a fifth connection terminal 105, a Hall current acquisition circuit 40, and a power module 30 for charging or discharging the battery 20.

[0078] The first screw 501, which passes through the first hole and the first OT terminal 601, is screwed to the first nut 801 so that the first aluminum sheet 701 abuts against the first OT terminal 601. The second screw 502, which passes through the second hole and the second OT terminal 602, is screwed to the second nut 802 so that the second aluminum sheet 702 abuts against the second OT terminal 602.

[0079] The first connection terminal 101 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively. The first end of the first OT terminal 601 is also connected to the power module 30 through a Hall current acquisition circuit 40 for acquiring current. The Hall current acquisition circuit 40 is also connected to the third connection terminal 103. The fourth connection terminal 104 is connected to the first temperature sensor 401. The second connection terminal 102 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively. The fifth connection terminal 105 is connected to the second temperature sensor 402.

[0080] The contact impedance of battery 20 includes: a first contact impedance between the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701, and a second contact impedance between the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702; wherein, the first connection end 101 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively; the second connection end 102 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively;

[0081] The detection device 10 is used to determine the location of the abnormal point in the charging and discharging circuit of the battery 20 by combining the collected temperature value of the first OT terminal 601, the collected temperature value of the second OT terminal 602, the calculated first contact impedance, and the calculated second contact impedance. The abnormal point locations include: between the first aluminum sheet 701 and the first OT terminal 601; between the battery positive terminal 201 and the first aluminum sheet 701; between the first OT terminal 601 and the cable used to connect the power module 30; between the second aluminum sheet 702 and the second OT terminal 602; between the battery negative terminal 202 and the second aluminum sheet 702; or between the second OT terminal 602 and the cable used to connect the power module 30.

[0082] The charging and discharging circuit of battery 20 may include, but is not limited to: battery positive terminal 201, battery negative terminal 202, first aluminum sheet 701, second aluminum sheet 702, first OT terminal 601, second OT terminal 602, power module 30, Hall current acquisition circuit 40, first screw 501, second screw 502, first nut 801, second nut 802, and connecting cables or lines between the various components in the charging and discharging circuit of battery 20.

[0083] It should be noted that the first OT terminal 601 and the second OT terminal 602 belong to different OT terminals; the first aluminum sheet 701 and the second aluminum sheet 702 belong to different aluminum sheets; the first screw 501 and the second screw 502 belong to different screws; the first nut 801 and the second nut 802 belong to different nuts; the first connecting end 101, the second connecting end 102, the third connecting end 103, the fourth connecting end 104, and the fifth connecting end 105 belong to different connecting ends of the detection device 10; and the first temperature sensor 401 and the second temperature sensor 402 belong to different temperature sensors.

[0084] Preferably, the Hall current acquisition circuit 40 is disposed between the first end of the first OT terminal 601 and the power module 30 to acquire the current flowing between the first end of the first OT terminal 601 and the power module 30.

[0085] The first connection terminal 101 of the detection device 10 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively, so as to collect the first voltage flowing through the positive terminal 201 of the battery. The detection device 10 determines the first contact impedance between the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 by combining the collected current flowing between the first end of the first OT terminal 601 and the power module 30.

[0086] The second connection terminal 102 of the detection device 10 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively, so as to collect the second voltage flowing through the negative terminal 202 of the battery. The detection device 10 determines the second contact impedance between the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 by combining the collected current flowing between the first end of the first OT terminal 601 and the power module 30.

[0087] The first temperature sensor 401, which is mounted on the first OT terminal 601, is connected to the fourth connection terminal 104 of the detection device 10 to transmit the collected temperature value of the first OT terminal 601 to the detection device 10.

[0088] The second temperature sensor 402, which is installed on the second OT terminal 602, is connected to the fifth connection terminal 105 of the detection device 10 to transmit the collected temperature value of the second OT terminal 602 to the detection device 10.

[0089] It should be noted that the first conductive port and the second conductive port are different conductive ports; the first voltage is used to characterize the voltage of the positive terminal 201 of the battery, and the second voltage is used to characterize the voltage of the negative terminal 202 of the battery.

[0090] Preferably, the detection device 10 is used to obtain the current flowing between the first end of the first OT terminal 601 and the power module 30, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal 601, and the collected temperature value of the second OT terminal 602 through the first connection terminal 101, the second connection terminal 102, the third connection terminal 103, the fourth connection terminal 104, and the fifth connection terminal 105, and to display the current flowing between the first end of the first OT terminal 601 and the power module 30, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal 601, and the collected temperature value of the second OT terminal 602 through the display screen 107 on the detection device 10.

[0091] It should be noted that the first contact impedance is the impedance presented by the contact portion between the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701, and the second contact impedance is the impedance presented by the contact portion between the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702.

[0092] Preferably, the testing device 10 is specifically used for:

[0093] The temperature value of the first OT terminal 601 is used as the first temperature of the positive terminal 201 of the battery, and the temperature value of the second OT terminal 602 is used as the second temperature of the negative terminal 202 of the battery; wherein, the first temperature is used to characterize the temperature of the positive terminal 201 of the battery, and the second temperature is used to characterize the temperature of the negative terminal 202 of the battery.

[0094] The system determines whether the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, the temperature of the positive terminal 201 of the battery is determined to be abnormal. The system then determines whether the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, the temperature of the negative terminal 202 of the battery is determined to be abnormal. The preset temperature value can be set to multiple different values ​​according to user needs.

[0095] Preferably, the testing device 10 is also specifically used for:

[0096] The temperature value of the first OT terminal 601 collected is used as the first temperature of the positive terminal 201 of the battery.

[0097] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point causing the abnormal temperature of the battery positive terminal 201 is determined to be between the first aluminum sheet 701 and the first OT terminal 601 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the first aluminum sheet 701 and the first OT terminal 601. The preset impedance value can be set to multiple different values ​​according to user needs.

[0098] Preferably, the testing device 10 is also specifically used for:

[0099] The temperature value of the first OT terminal 601 collected is used as the first temperature of the positive terminal 201 of the battery.

[0100] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point location causing the abnormal temperature of the battery positive terminal 201 is determined to be between the battery positive terminal 201 and the first aluminum sheet 701 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the battery positive terminal 201 and the first aluminum sheet 701. Alternatively, the abnormal point location causing the abnormal temperature of the battery positive terminal 201 is determined to be between the first OT terminal 601 and the cable used to connect the power module 30 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the first OT terminal 601 and the cable used to connect the power module 30.

[0101] Preferably, the testing device 10 is also specifically used for:

[0102] The temperature value of the second OT terminal 602 collected is used as the second temperature of the battery negative terminal 202;

[0103] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal 202 is determined to be between the second aluminum sheet 702 and the second OT terminal 602 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery negative terminal 202 is caused by poor contact between the second aluminum sheet 702 and the second OT terminal 602.

[0104] Preferably, the testing device 10 is also specifically used for:

[0105] The temperature value of the second OT terminal 602 collected is used as the second temperature of the battery negative terminal 202;

[0106] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal 202 is determined to be between the battery negative terminal 202 and the second aluminum sheet 702 in the charging and discharging circuit of the battery 20. Furthermore, the abnormal temperature of the battery negative terminal 202 is caused by poor contact between the battery negative terminal 202 and the second aluminum sheet 702.

[0107] The abnormal point that caused the abnormal temperature of the battery negative terminal 202 was determined to be between the second OT terminal 602 and the cable used to connect the power module 30 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery negative terminal 202 was caused by poor contact between the second OT terminal 602 and the cable used to connect the power module 30.

[0108] Preferably, the detection device 10 is also connected to the central control unit via WIFI, Bluetooth, or cable to upload the unique code of the battery 20 with abnormal temperature at the positive terminal 201 or the negative terminal 202 to the central control unit. The unique code of the battery 20 is a unique identification code of the battery 20, which is used by the central control unit to identify batteries 20 in the detection system with the same unique code as the above-mentioned battery with abnormal temperature at the positive terminal 201 or the negative terminal 202, so that users can intuitively identify abnormal batteries with abnormal temperature at the positive terminal or the negative terminal in the detection system through the central control unit or the detection device 10.

[0109] Preferably, the testing device 10 is also used for:

[0110] The temperature of the positive terminal 201 and the negative terminal 202 of the battery are periodically collected, and the current flowing between the first end of the first OT terminal 601 and the power module 30 is collected. The first contact impedance and the second contact impedance are calculated. The unique code of the battery 20 with abnormal temperature of positive terminal 201 or negative terminal 202 is periodically uploaded to the central control computer connected to the detection device 10. Thus, the central control computer can promptly identify abnormal batteries with abnormal temperature of positive terminal or negative terminal in the detection system.

[0111] Preferably, the detection system includes a first battery, a second battery, a first detection device for detecting the first battery, and a second detection device for detecting the second battery. The first battery and the second battery are respectively connected to a central control unit via the first and second detection devices. When the temperature of the positive or negative terminal of the first battery is abnormal, the first detection device uploads the unique code of the first battery to the central control unit connected to it. Similarly, when the temperature of the positive or negative terminal of the second battery is abnormal, the second detection device uploads the unique code of the second battery to the central control unit connected to it. This allows the central control unit to identify abnormal batteries in the detection system with abnormal positive or negative terminal temperatures.

[0112] This application provides a device for detecting the contact resistance and temperature of a battery. Taking the detection device 10 and the battery 20 as an example, the device... Figure 2 As shown, specifically, battery 20 includes: battery positive terminal 201, battery negative terminal 202, and the detection device 10 may include, but is not limited to:

[0113] The system includes a first connection terminal 101, a second connection terminal 102, a third connection terminal 103, a fourth connection terminal 104, a fifth connection terminal 105, a display screen 107, and an MCU (Microcontroller Unit) chip 106 for determining the contact impedance of the battery 20; wherein,

[0114] The first connection terminal 101 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively. The first end of the first OT terminal 601 is also connected to the power module 30 through a Hall current acquisition circuit 40 for acquiring current. The Hall current acquisition circuit 40 is also connected to the third connection terminal 103. The fourth connection terminal 104 is connected to the first temperature sensor 401 disposed on the first OT terminal 601 for acquiring the temperature value of the first OT terminal 601. The second connection terminal 102 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively. The fifth connection terminal 105 is connected to the second temperature sensor 402 disposed on the second OT terminal 602 for acquiring the temperature value of the second OT terminal 602.

[0115] A first aluminum sheet 701 is welded to the positive terminal post 201 of the battery and has a first hole. A first screw 501, passing through the first hole and the first OT terminal 601, is screwed to a first nut 801 so that the first aluminum sheet 701 abuts against the first OT terminal 601. A second aluminum sheet 702 is welded to the negative terminal post 202 of the battery and has a second hole. A second screw 502, passing through the second hole and the second OT terminal 602, is screwed to a second nut 802 so that the second aluminum sheet 702 abuts against the second OT terminal 602.

[0116] The contact impedance of battery 20 may include, but is not limited to: a first contact impedance between the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701, and a second contact impedance between the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702; wherein, the first connection end 101 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively; the second connection end 102 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively;

[0117] The MCU chip 106 is used to determine the location of the abnormal point in the charging and discharging circuit of the battery 20 by combining the collected temperature value of the first OT terminal 601, the collected temperature value of the second OT terminal 602, the calculated first contact impedance, and the calculated second contact impedance. The abnormal point locations include: between the first aluminum plate 701 and the first OT terminal 601; between the battery positive terminal 201 and the first aluminum plate 701; between the first OT terminal 601 and the cable used to connect the power module 30; between the second aluminum plate 702 and the second OT terminal 602; and between the battery negative terminal 202 and the second OT terminal 602. The charging and discharging circuit of the battery 20 may include, but is not limited to: the positive terminal 201 of the battery, the negative terminal 202 of the battery, the first aluminum sheet 701, the second aluminum sheet 702, the first OT terminal 601, the second OT terminal 602, the power module 30, the Hall current acquisition circuit 40, the first screw 501, the second screw 502, the first nut 801, the second nut 802, and the connecting cables or lines between the various components in the charging and discharging circuit of the battery 20.

[0118] Preferably, the Hall current acquisition circuit 40 is disposed between the first end of the first OT terminal 601 and the power module 30 to acquire the current flowing between the first end of the first OT terminal 601 and the power module 30.

[0119] The first connection terminal 101 is connected to the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701 respectively, so as to collect the first voltage flowing through the positive terminal 201 of the battery, and combine the collected current flowing between the first end of the first OT terminal 601 and the power module 30 to determine the first contact impedance between the first end of the first OT terminal 601 and the first conductive port of the first aluminum sheet 701.

[0120] The second connection terminal 102 is connected to the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 respectively, so as to collect the second voltage flowing through the negative terminal 202 of the battery. Combined with the current flowing between the first end of the first OT terminal 601 and the power module 30, the second contact impedance between the second end of the second OT terminal 602 and the second conductive port of the second aluminum sheet 702 is determined.

[0121] The first temperature sensor 401, which is set on the first OT terminal 601, is connected to the fourth connection terminal 104 to transmit the collected temperature value of the first OT terminal 601 to the MCU chip 106.

[0122] The second temperature sensor 402, which is located on the second OT terminal 602, is connected to the fifth connection terminal 105 to transmit the collected temperature value of the second OT terminal 602 to the MCU chip 106.

[0123] Preferably, the first connection terminal 101, the second connection terminal 102, the third connection terminal 103, the fourth connection terminal 104, and the fifth connection terminal 105 can be used to obtain the current flowing between the first end of the first OT terminal 601 and the power module 30, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal 601, and the collected temperature value of the second OT terminal 602. The display screen 107 can be used to display the current flowing between the first end of the first OT terminal 601 and the power module 30, the first contact impedance, the second contact impedance, the collected temperature value of the first OT terminal 601, and the collected temperature value of the second OT terminal 602.

[0124] Preferably, the MCU chip 106 is specifically used for:

[0125] The temperature value of the first OT terminal 601 is taken as the first temperature of the positive terminal 201 of the battery, and the temperature value of the second OT terminal 602 is taken as the second temperature of the negative terminal 202 of the battery.

[0126] Determine whether the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, it is determined that the temperature of the positive terminal 201 of the battery is abnormal. Determine whether the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, it is determined that the temperature of the negative terminal 202 of the battery is abnormal.

[0127] Preferably, the MCU chip 106 is also specifically used for:

[0128] The temperature value of the first OT terminal 601 collected is used as the first temperature of the positive terminal 201 of the battery.

[0129] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery positive terminal 201 is determined to be between the first aluminum sheet 701 and the first OT terminal 601 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the first aluminum sheet 701 and the first OT terminal 601.

[0130] Preferably, the MCU chip 106 is also specifically used for:

[0131] The temperature value of the first OT terminal 601 collected is used as the first temperature of the positive terminal 201 of the battery.

[0132] When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point location causing the abnormal temperature of the battery positive terminal 201 is determined to be between the battery positive terminal 201 and the first aluminum sheet 701 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the battery positive terminal 201 and the first aluminum sheet 701. Alternatively, the abnormal point location causing the abnormal temperature of the battery positive terminal 201 is determined to be between the first OT terminal 601 and the cable used to connect the power module 30 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery positive terminal 201 is caused by poor contact between the first OT terminal 601 and the cable used to connect the power module 30.

[0133] Preferably, the MCU chip 106 is also specifically used for:

[0134] The temperature value of the second OT terminal 602 collected is used as the second temperature of the battery negative terminal 202;

[0135] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal 202 is determined to be between the second aluminum sheet 702 and the second OT terminal 602 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery negative terminal 202 is caused by poor contact between the second aluminum sheet 702 and the second OT terminal 602.

[0136] Preferably, the MCU chip 106 is also specifically used for:

[0137] The temperature value of the second OT terminal 602 collected is used as the second temperature of the battery negative terminal 202;

[0138] When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal 202 is determined to be between the battery negative terminal 202 and the second aluminum sheet 702 in the charging and discharging circuit of the battery 20. Furthermore, the abnormal temperature of the battery negative terminal 202 is caused by poor contact between the battery negative terminal 202 and the second aluminum sheet 702.

[0139] The abnormal point that caused the abnormal temperature of the battery negative terminal 202 was determined to be between the second OT terminal 602 and the cable used to connect the power module 30 in the charging and discharging circuit of the battery 20, and the abnormal temperature of the battery negative terminal 202 was caused by poor contact between the second OT terminal 602 and the cable used to connect the power module 30.

[0140] Preferably, the Hall current acquisition circuit 40 periodically acquires the temperature of the positive terminal 201 of the battery, the temperature of the negative terminal 202 of the battery, and the current flowing between the first end of the first OT terminal 601 and the power module 30. The MCU chip 106 calculates the first contact impedance and the second contact impedance, and periodically uploads the unique code of the battery 20 with abnormal temperature of the positive terminal 201 or the negative terminal 202 of the battery to the central control computer.

[0141] It should be noted that, for the purpose of explanation Figure 2 The custom terminology or text used in the Chinese testing equipment 10 can be found in [reference]. Figure 1 The examples provided are explained and will not be repeated here.

[0142] Figures 1 to 2 This is merely used to explain the embodiments of this application and should not be construed as limiting the scope of protection of this application.

[0143] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the equipment and system described above can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0144] The embodiments of the systems and devices described above are merely illustrative. For example, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interface, device, system or component, or may be electrical, mechanical or other forms of connection.

[0145] Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0146] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A system for detecting the contact resistance and temperature of a battery, characterized in that, include: A battery positive terminal (201), a battery negative terminal (202), a first aluminum sheet (701) welded to the battery positive terminal (201) and having a first hole, a second aluminum sheet (702) welded to the battery negative terminal (202) and having a second hole, a first screw (501) passing through the first hole and the first OT terminal (601), a first nut (801) screwed to the first screw (501), a second screw (502) passing through the second hole and the second OT terminal (602), a second nut (802) screwed to the second screw (502), and a device for collecting first O data on the first OT terminal (601). A first temperature sensor (401) for the temperature value of the T terminal (601), a second temperature sensor (402) disposed on the second OT terminal (602) for collecting the temperature value of the second OT terminal (602), a detection device (10) for determining the contact impedance of the battery (20) including a first connection terminal (101), a second connection terminal (102), a third connection terminal (103), a fourth connection terminal (104) and a fifth connection terminal (105), a Hall current acquisition circuit (40), and a power module (30), the battery (20) including: a positive terminal (201) and a negative terminal (202); wherein, A first screw (501) passing through the first hole and the first OT terminal (601) is screwed to a first nut (801) so that the first aluminum sheet (701) abuts against the first OT terminal (601); a second screw (502) passing through the second hole and the second OT terminal (602) is screwed to a second nut (802) so that the second aluminum sheet (702) abuts against the second OT terminal (602); The first connection terminal (101) is connected to the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701) respectively. The first end of the first OT terminal (601) is also connected to the power module (30) through a Hall current acquisition circuit (40) for acquiring current. The Hall current acquisition circuit (40) is also connected to the third connection terminal (103). The fourth connection terminal (104) is connected to the first temperature sensor (401). The second connection terminal (102) is connected to the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) respectively. The fifth connection terminal (105) is connected to the second temperature sensor (402). The contact impedance of the battery (20) includes: the first contact impedance between the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701), and the second contact impedance between the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702); The detection device (10) is used to determine the location of the abnormal point in the charging and discharging circuit of the battery (20) by combining the temperature value of the first OT terminal (601), the temperature value of the second OT terminal (602), the first contact impedance, and the second contact impedance. The abnormal point location includes: between the first aluminum sheet (701) and the first OT terminal (601), between the positive terminal post (201) of the battery and the first aluminum sheet (701), and between the first OT terminal (601) and the wire used to connect the power module (30). Between the cables, between the second aluminum plate (702) and the second OT terminal (602), between the battery negative terminal (202) and the second aluminum plate (702), or between the second OT terminal (602) and the cable used to connect the power module (30); the charging and discharging circuit of the battery (20) includes: the battery positive terminal (201), the battery negative terminal (202), the first aluminum plate (701), the second aluminum plate (702), the first OT terminal (601), the second OT terminal (602) and the power module (30).

2. The battery contact resistance and temperature detection system as described in claim 1, characterized in that, The Hall current acquisition circuit (40) is located between the first end of the first OT terminal (601) and the power module (30) to acquire the current flowing between the first end of the first OT terminal (601) and the power module (30); The first connection terminal (101) of the detection device (10) is connected to the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701) respectively, so as to collect the first voltage flowing through the positive terminal (201) of the battery, and combine the collected current flowing between the first end of the first OT terminal (601) and the power module (30) to determine the first contact impedance between the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701); The second connection terminal (102) of the detection device (10) is connected to the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) respectively, so as to collect the second voltage flowing through the negative terminal (202) of the battery. Combined with the current flowing between the first end of the first OT terminal (601) and the power module (30) collected, the second contact impedance between the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) is determined. The first temperature sensor (401) set on the first OT terminal (601) is connected to the fourth connection terminal (104) of the detection device (10) to transmit the collected temperature value of the first OT terminal (601) to the detection device (10). The second temperature sensor (402) set on the second OT terminal (602) is connected to the fifth connection terminal (105) of the detection device (10) to transmit the collected temperature value of the second OT terminal (602) to the detection device (10).

3. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing device (10) is used to obtain the current flowing between the first end of the first OT terminal (601) and the power module (30), the first contact impedance, the second contact impedance, the temperature value of the first OT terminal (601) and the temperature value of the second OT terminal (602) through the first connection terminal (101), the second connection terminal (102), the third connection terminal (103), the fourth connection terminal (104) and the fifth connection terminal (105), and to display the current flowing between the first end of the first OT terminal (601) and the power module (30), the first contact impedance, the second contact impedance, the temperature value of the first OT terminal (601) and the temperature value of the second OT terminal (602) through the display screen (107) on the testing device (10).

4. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery, and the temperature value of the second OT terminal (602) is taken as the second temperature of the negative terminal (202) of the battery. Determine whether the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, it is determined that the temperature of the positive terminal (201) of the battery is abnormal. Determine whether the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, it is determined that the temperature of the negative terminal (202) of the battery is abnormal.

5. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is also specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery; When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery positive terminal (201) is determined to be between the first aluminum sheet (701) and the first OT terminal (601) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the first aluminum sheet (701) and the first OT terminal (601).

6. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is also specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery; When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point location causing the abnormal temperature of the battery positive terminal (201) is determined to be between the battery positive terminal (201) and the first aluminum sheet (701) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the battery positive terminal (201) and the first aluminum sheet (701). Alternatively, the abnormal point location causing the abnormal temperature of the battery positive terminal (201) is determined to be between the first OT terminal (601) and the cable used to connect the power module (30) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the first OT terminal (601) and the cable used to connect the power module (30).

7. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is also specifically used for: The temperature value of the second OT terminal (602) collected is used as the second temperature of the battery negative terminal (202); When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal (202) is determined to be between the second aluminum sheet (702) and the second OT terminal (602) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery negative terminal (202) is caused by poor contact between the second aluminum sheet (702) and the second OT terminal (602).

8. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is also specifically used for: The temperature value of the second OT terminal (602) collected is used as the second temperature of the battery negative terminal (202); When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal (202) is determined to be between the battery negative terminal (202) and the second aluminum sheet (702) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery negative terminal (202) is caused by poor contact between the battery negative terminal (202) and the second aluminum sheet (702), or, The abnormal point that caused the abnormal temperature of the battery negative terminal (202) was determined to be between the second OT terminal (602) in the charging and discharging circuit of the battery (20) and the cable used to connect the power module (30). The abnormal temperature of the battery negative terminal (202) was caused by poor contact between the second OT terminal (602) and the cable used to connect the power module (30).

9. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The detection device (10) is also connected to the central control unit via WIFI, Bluetooth or cable to upload the unique code of the battery (20) with abnormal temperature of positive terminal (201) or negative terminal (202) to the central control unit.

10. The battery contact resistance and temperature detection system as described in claim 2, characterized in that, The testing equipment (10) is also used for: The temperature of the positive terminal (201) of the battery is periodically collected, the temperature of the negative terminal (202) of the battery is collected, the current flowing between the first end of the first OT terminal (601) and the power module (30) is collected, the first contact impedance and the second contact impedance are calculated, and the unique code of the battery (20) with abnormal temperature of positive terminal (201) or abnormal temperature of negative terminal (202) of the battery is periodically uploaded to the central control computer connected to the detection device (10).

11. A device for detecting the contact resistance and temperature of a battery, characterized in that, include: The system includes a first connection terminal (101), a second connection terminal (102), a third connection terminal (103), a fourth connection terminal (104), a fifth connection terminal (105), a display screen (107), and an MCU chip (106) for determining the contact impedance of the battery (20). The battery (20) includes: a positive terminal (201) and a negative terminal (202). The first connection terminal (101) is connected to the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701) respectively. The first end of the first OT terminal (601) is also connected to the power module (30) through a Hall current acquisition circuit (40) for acquiring current. The Hall current acquisition circuit (40) is also connected to the third connection terminal (103). The fourth connection terminal (104) is connected to the first temperature sensor (401) disposed on the first OT terminal (601) for acquiring the temperature value of the first OT terminal (601). The second connection terminal (102) is connected to the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) respectively. The fifth connection terminal (105) is connected to the second temperature sensor (402) disposed on the second OT terminal (602) for acquiring the temperature value of the second OT terminal (602). A first aluminum sheet (701) is welded to the positive terminal post (201) of the battery and has a first hole. A first screw (501) passing through the first hole and the first OT terminal (601) is screwed to a first nut (801) so that the first aluminum sheet (701) abuts against the first OT terminal (601). A second aluminum sheet (702) is welded to the negative terminal post (202) of the battery and has a second hole. A second screw (502) passing through the second hole and the second OT terminal (602) is screwed to a second nut (802) so that the second aluminum sheet (702) abuts against the second OT terminal (602). The contact impedance of the battery (20) includes: the first contact impedance between the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701), and the second contact impedance between the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702); The MCU chip (106) is used to determine the location of the abnormal point in the charging and discharging circuit of the battery (20) by combining the collected temperature value of the first OT terminal (601), the collected temperature value of the second OT terminal (602), the first contact impedance, and the second contact impedance. The abnormal point locations include: between the first aluminum plate (701) and the first OT terminal (601), between the battery positive terminal (201) and the first aluminum plate (701), and between the first OT terminal (601) and the terminal used to connect the power module (30). Between the cables, between the second aluminum plate (702) and the second OT terminal (602), between the battery negative terminal (202) and the second aluminum plate (702), or between the second OT terminal (602) and the cable used to connect the power module (30); the charging and discharging circuit of the battery (20) includes: the battery positive terminal (201), the battery negative terminal (202), the first aluminum plate (701), the second aluminum plate (702), the first OT terminal (601), the second OT terminal (602) and the power module (30).

12. The battery contact resistance and temperature detection device as described in claim 11, characterized in that, The Hall current acquisition circuit (40) is located between the first end of the first OT terminal (601) and the power module (30) to acquire the current flowing between the first end of the first OT terminal (601) and the power module (30); The first connection terminal (101) is connected to the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701) respectively, so as to collect the first voltage flowing through the positive terminal (201) of the battery, and combine the collected current flowing between the first end of the first OT terminal (601) and the power module (30) to determine the first contact impedance between the first end of the first OT terminal (601) and the first conductive port of the first aluminum sheet (701); The second connection terminal (102) is connected to the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) respectively, so as to collect the second voltage flowing through the negative terminal (202) of the battery. Combined with the current flowing between the first end of the first OT terminal (601) and the power module (30) collected, the second contact impedance between the second end of the second OT terminal (602) and the second conductive port of the second aluminum sheet (702) is determined. The first temperature sensor (401) located on the first OT terminal (601) is connected to the fourth connection terminal (104) to transmit the collected temperature value of the first OT terminal (601) to the MCU chip (106). The second temperature sensor (402) located on the second OT terminal (602) is connected to the fifth connection terminal (105) to transmit the collected temperature value of the second OT terminal (602) to the MCU chip (106).

13. The battery contact resistance and temperature detection device as described in claim 11, characterized in that, The display screen (107) is used to display the current flowing between the first end of the first OT terminal (601) and the power module (30), the first contact impedance, the second contact impedance, the temperature value of the first OT terminal (601) collected, and the temperature value of the second OT terminal (602) collected.

14. The device for detecting the contact resistance and temperature of a battery as described in claim 11, characterized in that, The MCU chip (106) is specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery, and the temperature value of the second OT terminal (602) is taken as the second temperature of the negative terminal (202) of the battery. Determine whether the first temperature exceeds the preset temperature value. If the first temperature exceeds the preset temperature value, it is determined that the temperature of the positive terminal (201) of the battery is abnormal. Determine whether the second temperature exceeds the preset temperature value. If the second temperature exceeds the preset temperature value, it is determined that the temperature of the negative terminal (202) of the battery is abnormal.

15. The battery contact resistance and temperature detection device as described in claim 11, characterized in that, The MCU chip (106) is also specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery; When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery positive terminal (201) is determined to be between the first aluminum sheet (701) and the first OT terminal (601) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the first aluminum sheet (701) and the first OT terminal (601).

16. The device for detecting the contact resistance and temperature of a battery as described in claim 11, characterized in that, The MCU chip (106) is also specifically used for: The temperature value of the first OT terminal (601) is taken as the first temperature of the positive terminal (201) of the battery; When the first temperature exceeds the preset temperature value, it is determined whether the first contact impedance is less than the preset impedance value. If the first contact impedance is less than the preset impedance value, the abnormal point location causing the abnormal temperature of the battery positive terminal (201) is determined to be between the battery positive terminal (201) and the first aluminum sheet (701) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the battery positive terminal (201) and the first aluminum sheet (701). Alternatively, the abnormal point location causing the abnormal temperature of the battery positive terminal (201) is determined to be between the first OT terminal (601) and the cable used to connect the power module (30) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery positive terminal (201) is caused by poor contact between the first OT terminal (601) and the cable used to connect the power module (30).

17. The battery contact resistance and temperature detection device as described in claim 11, characterized in that, The MCU chip (106) is also specifically used for: The temperature value of the second OT terminal (602) collected is used as the second temperature of the battery negative terminal (202); When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is greater than the preset impedance value, the abnormal point that causes the abnormal temperature of the battery negative terminal (202) is determined to be between the second aluminum sheet (702) and the second OT terminal (602) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery negative terminal (202) is caused by poor contact between the second aluminum sheet (702) and the second OT terminal (602).

18. The device for detecting the contact resistance and temperature of a battery as described in claim 11, characterized in that, The MCU chip (106) is also specifically used for: The temperature value of the second OT terminal (602) collected is used as the second temperature of the battery negative terminal (202); When the second temperature exceeds the preset temperature value, it is determined whether the second contact impedance is less than the preset impedance value. If the second contact impedance is less than the preset impedance value, the abnormal point causing the abnormal temperature of the battery negative terminal (202) is determined to be between the battery negative terminal (202) and the second aluminum sheet (702) in the charging and discharging circuit of the battery (20), and the abnormal temperature of the battery negative terminal (202) is caused by poor contact between the battery negative terminal (202) and the second aluminum sheet (702), or, The abnormal point that caused the abnormal temperature of the battery negative terminal (202) was determined to be between the second OT terminal (602) in the charging and discharging circuit of the battery (20) and the cable used to connect the power module (30). The abnormal temperature of the battery negative terminal (202) was caused by poor contact between the second OT terminal (602) and the cable used to connect the power module (30).

19. The device for detecting the contact resistance and temperature of a battery as described in claim 11, characterized in that, The Hall current acquisition circuit (40) periodically acquires the temperature of the positive terminal (201) of the battery, the temperature of the negative terminal (202) of the battery, and the current flowing between the first end of the first OT terminal (601) and the power module (30). The MCU chip (106) calculates the first contact impedance and the second contact impedance. The unique code of the battery (20) with abnormal temperature of positive terminal (201) or abnormal temperature of negative terminal (202) is periodically uploaded to the central control computer.

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