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System and method for detecting copper bar connection in battery pack

A battery pack and battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as harsh working conditions, endangering the personal safety of passengers, and rising battery pack temperature.

Active Publication Date: 2019-09-10
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The working conditions of these components are relatively harsh. Under vibration, acid and alkali gas corrosion, temperature changes and humidity changes, the copper bars may loosen over time, such as figure 1 As shown, the performance of the torque is less than the preset torque
The working voltage of the power battery is generally above 300V DC. If the connection of the copper bar is loose due to the above reasons (the torque is less than the preset torque), the contact resistance will increase, and a large current will continue to flow during the operation of the vehicle. It will cause the copper bar and its connection to continue to generate heat and oxidize, which will cause the temperature of the entire battery pack to rise, affect the normal operation of the electrical system, and even cause the battery pack to catch fire and endanger the personal safety of passengers.

Method used

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  • System and method for detecting copper bar connection in battery pack
  • System and method for detecting copper bar connection in battery pack
  • System and method for detecting copper bar connection in battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The invention provides a system for detecting the connection of copper bars in a battery pack, such as figure 2As shown, the system for detecting the connection of the copper bars in the battery pack may include: a preset unit 201, configured to acquire The state range of the state value of the copper bar connection is taken as a normal value range; the state acquisition unit 202 is used to obtain the actual state value of the copper bar connection in real time; the control unit 203 is used to judge whether the actual state value is in the specified range. If the judgment result is yes, it is determined that the connection of the copper bar is in normal contact; if the judgment result is no, it is determined that the contact of the connection of the copper bar is abnormal.

[0035] Among them, briefly introduce the role of each unit. The preset unit 201 is mainly used to preset the normal value range of the status value of the copper bar connection, and is used to set...

Embodiment 2

[0039] Figure 3A It is a structural block diagram of Embodiment 2 of the present invention. Embodiment 2 is a further improvement of Embodiment 1. Compared with Embodiment 1, the part of the preset unit is replaced. Figure 3B It is actually the circuit diagram of the second embodiment. Let's describe it in detail.

[0040] Such as Figure 3A As shown, in order to obtain the normal value range of the state value reflecting the connection of the copper bar, the preset unit 201 may include: a plurality of first temperature sensors 301, each of which is respectively placed in the Each copper bar connection of the battery pack is used to characterize the resistance value corresponding to the temperature value of each copper bar connection.

[0041] Correspondingly, the voltage acquisition module 302 is used to obtain all the values ​​except all of the loops formed by the resistance and the power supply when the battery pack is working normally and the torque at the copper bar ...

Embodiment 3

[0051] Figure 4 It is a structural block diagram of Embodiment 3 of the present invention. Embodiment 3 is a further improvement made on the basis of Embodiment 1, and is actually a technical solution paralleled with Embodiment 2.

[0052] Such as Figure 4 As shown, in order to detect the connection situation of each copper bar connection, and accurately detect each copper bar connection, the preset unit 201 may include: a temperature sensing module 401, which is used in the battery pack In the case of normal operation and the torque at the copper bar connection of the battery pack is within a preset normal range, the temperature range of the temperature value at the copper bar connection is obtained as a normal value range.

[0053] Wherein, the temperature sensing module 401 is used to directly detect the temperature of the copper bar connection of the battery pack, and directly according to the torque at the copper bar connection of the battery pack in the normal workin...

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PUM

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Abstract

Embodiments of the invention provide a system and method for detecting copper bar connection in a battery pack, and belongs to the field of battery pack detection. The system for detecting copper barconnection in the battery pack comprises the following parts of a preset unit configured to acquire the state range where the state value of the copper bar connection belongs as a normal value range in a case where the battery pack works normally and the torque at the copper bar connection of the battery pack is within a preset normal range; a state collecting unit configured to obtain an actual state value of the copper bar connection in real time; and a control unit configured to determine whether the actual state value is within the normal value range, determine that the contact of the copper bar connection is normal if so, and determine that the contact of the copper bar connection is abnormal otherwise. The system for detecting copper bar connection in the battery pack realizes real-time detection of the copper bar connection, and avoids the safety hazard caused by looseness of the copper bar connection.

Description

technical field [0001] The invention relates to the field of battery pack detection, in particular to a system and method for detecting the connection of copper bars in a battery pack. Background technique [0002] The three core systems in electric vehicles include: motor control, power battery, and vehicle controller. Power battery is the most core device in three electrics, and its composition includes: module, various detection sensors, manual maintenance switch (Manual Service Disconnect), connection copper bar, battery management system (BATTERY MANAGEMENT SYSTEM, BMS), battery pack shell structure etc. The copper bar is used as a bridge connecting the modules to conduct electricity through screw connections. The working conditions of these components are relatively harsh. Under vibration, acid and alkali gas corrosion, temperature changes and humidity changes, the copper bars may loosen over time, such as figure 1 As shown, the performance is that the torque is les...

Claims

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Application Information

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IPC IPC(8): G01R31/04G01R31/385
CPCG01R31/385G01R31/67Y02E60/10
Inventor 裴家俊颜广博冯志升董佳熹王锐
Owner SVOLT ENERGY TECHNOLOGY CO LTD