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Method for protecting cascaded lithium ion batteries and circuit

A lithium-ion battery and protection circuit technology, which is used in emergency protection circuit devices, secondary battery charging/discharging, and secondary battery repair/maintenance, etc. problem, to achieve the effect of convenient implementation and simple structure

Active Publication Date: 2006-02-01
SUZHOU PHYLION BATTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, there is a lack of mature charge-discharge protection technology. If the above-mentioned 1-4 series lithium-ion battery protection integrated circuits are used in multiple chips, there will be problems that the potentials of each integrated circuit are different, and the definitions of high and low levels are inconsistent. This limits the development of the technology of using multiple lithium-ion batteries in series

Method used

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  • Method for protecting cascaded lithium ion batteries and circuit
  • Method for protecting cascaded lithium ion batteries and circuit
  • Method for protecting cascaded lithium ion batteries and circuit

Examples

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Embodiment 1

[0022] Embodiment one: see attached figure 1 As shown, a protection circuit for lithium-ion batteries in series is used for charging and discharging protection of 10 lithium-ion batteries in series, including a single cell voltage detection circuit, an overcharge and overdischarge signal generation circuit and a control switch. Cells are grouped, 2 of which are composed of 3 lithium-ion cells connected in series, and 1 group is composed of 4 lithium-ion cells connected in series. Composition, the voltage detection circuit of each single cell group and each group of signal generation modules use 1 to 4 serial lithium-ion battery protection integrated circuits MM1414, the overcharge signals of the three groups of modules are OV1, OV2, OV3, respectively, The over-discharge signals are respectively DC1, DC2, and DC3, and the signal synthesis module includes an over-charge signal synthesis module and an over-discharge signal synthesis module. The non-common ground level conversion...

Embodiment 2

[0026] Embodiment two: see attached figure 2 As shown, a protection circuit for lithium-ion batteries in series is used for charging and discharging protection of 8 lithium-ion batteries in series, including a single cell voltage detection circuit, an overcharge and overdischarge signal generation circuit and a control switch. The batteries are divided into two groups, each group is composed of 4 lithium-ion batteries connected in series, the overcharge and overdischarge signal generation circuit is composed of each group of signal generation modules and signal synthesis modules in two stages, and each single battery The voltage detection circuit of the core pack and each group of signal generation modules adopt MM1414 lithium-ion battery protection integrated circuit with 1 to 4 serial cells. The overcharge signals of the two groups of modules are OV1 and OV2, and the overdischarge signals are DC1 and DC2 respectively. The signal synthesis module includes an overcharge signa...

Embodiment 3

[0029] Embodiment three: see attached image 3 As shown, a protection circuit for lithium-ion batteries in series is used for charging and discharging protection of 7-cell lithium-ion batteries in series, including a single cell voltage detection circuit, an overcharge and overdischarge signal generation circuit and a control switch, and the single cell The cells are divided into two groups, one group is composed of 4 lithium-ion cells in series, and the other group is composed of 3 lithium-ion cells in series. The overcharge and over-discharge signal generation circuit is composed of each group of signal generation modules and signal synthesis modules. Two-level structure, the voltage detection circuit of each single cell group and each group of signal generation modules use 1 to 4 series lithium-ion battery protection integrated circuits MM1414, the overcharge signals of the two groups of modules are OV1, OV2, respectively, The over-discharge signals are respectively DC1 and...

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Abstract

In the invention, single battery core is grouped. Each group includes cascaded single battery in quantity no more than four pieces. Using protection IC suitable for 1-4 pieces of cascaded lithium ion batteries obtains overcharge signal and overdischarge signal of each group of battery core. Through not common grounding electrical level conversion, overcharge signal level in each group is adjusted unitedly, and synthesized as one overcharge signal. Similarly, one overdischarge signal is synthesized. Output control switch of cascaded batteries is controlled by the said synthesized overcharge signal and overdischarge signal so as to realize protection for batteries. Using protection IC suitable for 1-4 pieces of cascaded lithium ion batteries, the invention realizes protection for more than five pieces of batteries. Features are simple structure and easy of implementation.

Description

technical field [0001] The invention relates to a protection method and circuit for lithium ion batteries used in series, and is especially suitable for use in the occasion where more than five lithium ion batteries are connected in series to prevent single batteries from overcharging or overdischarging. Background technique [0002] Batteries are usually used in series and parallel to provide higher output voltage and larger power capacity to meet the needs of load driving. Because rechargeable batteries have good cost performance, they are widely used in various electronic products and even electric vehicles. Lithium-ion batteries, in particular, have attracted people's attention due to their small size and light weight. However, lithium-ion batteries also have the problem that overcharging or over-discharging will affect their service life. Therefore, protection circuits such as overcharging, over-discharging, over-current, and overheating must b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H02H7/18
CPCY02E60/12Y02E60/10
Inventor 王潘黄学杰
Owner SUZHOU PHYLION BATTERY