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Battery pack protection circuit and method

A technology for protecting circuits and battery packs, applied in battery circuit devices, safety/protection battery circuits, circuit devices, etc., can solve the problem of incomplete security technology for battery arrays, and achieve cost saving, normal operation, and fire prevention Effect

Inactive Publication Date: 2017-06-13
CENT SOUTH UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the field that requires a large amount of power as a power source, the insurance technology to protect the battery array is not yet complete

Method used

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  • Battery pack protection circuit and method

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Embodiment 1

[0030] In this embodiment, the battery pack circuit of the present invention is applied to supply power for pure electric vehicles.

[0031] Among the commonly used batteries for pure electric vehicles, the normal specification is 108V, 60Ah; it is generally composed of 3.6V, 2.0Ah monomer batteries connected in series and parallel. Therefore, each battery pack needs to be connected in parallel with 30 single cells. In this embodiment, 30+1 such battery packs are connected in series to provide the power required by the pure electric vehicle.

[0032] The structure diagram of the battery pack of this embodiment is as follows figure 2 As shown, the numbers of the battery modules are 1, 2, ..., 31, and the numbers of the switches are A1, A2, ..., A31. Each group of switches includes a first switch (a switch) and a second switch (b switch). Except that the first switch in the redundant battery module is a normally open switch, the first switches in the other battery modules are...

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Abstract

The invention discloses a battery pack protection circuit and method. The battery pack protection circuit adopts the following structure: a battery cell and a PTC (Positive Temperature Coefficient) thermistor are connected in series to form a battery unit; a plurality of battery units with the same structure are connected in parallel to form a battery pack; the quantity of the battery units, which are arranged in parallel, in the battery pack is determined according to current needed by a load. After each battery pack is connected with a first switch in series, the battery pack is connected with a second switch in parallel, so that a battery module is formed; a plurality of battery modules are connected in series to supply power to the load; the battery modules, which are connected in series, comprises N common battery modules and M redundancy battery modules; the PTC thermistors are connected with a temperature sensor; an output end of the temperature sensor is connected with a control module; the control module is used for controlling switching-off / on of the first switch and the second switch in each battery module according to a temperature condition which is monitored by the temperature sensor in real time. According to the battery pack protection circuit and method, a dangerous battery cell can be separated and the effects that the battery pack can still work when a single battery cell is damaged are realized.

Description

technical field [0001] The invention relates to a battery pack protection circuit and method. Background technique [0002] Non-renewable resources such as oil and natural gas will be in short supply in the future, which is an inevitable loss. At the same time, the use of oil and natural gas will cause environmental pollution and cause greater losses. Therefore, people try to use natural power such as solar energy, wind power, water power, and clean and pollution-free electric energy as alternative energy sources. Therefore, electric vehicles that use clean and pollution-free electric energy as an alternative energy source are rising day by day, but technical challenges also follow. For the previous electric motors, it needs to rely on a large amount of electric energy to drive the vehicle smoothly; therefore, the battery pack required to propel the vehicle, such as figure 1 As shown, hundreds or even thousands of battery cells are often connected in series and parallel t...

Claims

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Application Information

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IPC IPC(8): H02J7/00
CPCH02J7/0026
Inventor 刘雄飞崔彬
Owner CENT SOUTH UNIV
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