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Highly secure lithium ion dynamic battery and its assembly method

A lithium battery and power technology, applied in battery electrodes, secondary batteries, battery pack components, etc., can solve problems such as user safety hazards, exothermic reaction explosion, etc., to reduce the risk of explosion, reduce the chance of external impact, The effect of reducing the heat release of thermal reactions

Inactive Publication Date: 2008-01-16
北京中润恒动电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these measures only reduce the risk of explosion to a certain extent, and for large-capacity batteries, it is still not guaranteed to effectively prevent the occurrence of explosion in all cases
For example, when the battery is internally short-circuited due to violent vibration or extrusion, its violent exothermic reaction will still cause an explosion, bringing safety hazards to users

Method used

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  • Highly secure lithium ion dynamic battery and its assembly method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Production of 50Ah high-power lithium-ion power battery

[0044] The cathode material is LiMn 2 o 4 , The battery is made by winding. After drying, 0.7M LiBOB electrolyte solution is vacuum-injected, and the solvent contains nonafluorobutyl ether (5-15% v / v). Each cell has a capacity of 10Ah.

[0045] Lead out the positive and negative tabs of each unit battery in parallel.

[0046] After forming the unit cell, assemble it in a rectangular parallelepiped casing, and then inject 50-150ml of a mixture of nonafluorobutyl ether and tributyl phosphate (the ratio is 1:2 (v / v)).

[0047] The unit cells are packaged and assembled into a whole battery.

Embodiment 2

[0048] Example 2: Fabrication of a 100Ah high-power lithium-ion power battery.

[0049] The cathode material is LiFePO 4 , The battery is laminated. After drying, the electrolyte is vacuum injected. LiBOB salt is used as the electrolyte, and carbonates are used as the solvent. The solvent contains tris(3-fluoroethyl phosphate), and its consumption is 10-20% (v / v) of the total solvent. The concentration of the conductive salt is 0.7M, and the capacity of the single battery is 10Ah.

[0050] Other preparation steps are identical with embodiment 1. The flame retardant is a mixture of tris(3-fluoroethyl phosphate) and nonafluorobutyl ether with a volume ratio of 1:2, and the dosage is 100-250ml.

Embodiment 3

[0051] Example 3: Fabrication of a 100Ah high-power lithium-ion power battery.

[0052] The cathode material is LiMn 2 o 4 The ratio of its dosage to LiNi1 / 3CO1 / 3Mn1 / 3O2 mixture is 3:7~4:6 (w / w). The production method is the same as Example 1. The electrolyte uses 0.4M LiPF6+0.7M LiBOB mixed salt as the electrolyte. The solvent system contains trifluoroethyl borate and nonafluorobutyl ether flame retardant in a ratio of 3:2 (v / v). The flame retardant accounts for 10-15% (v / v) of the total solvent. In order to reduce LiMn 2 o 4 Dissolve and add a small amount of polymer monomer (0.1-0.5%, w / v) to form a protective film on the positive electrode.

[0053] Other steps are identical with embodiment 1.

[0054] The flame retardant is a gel-type mixture of triphenyl phosphate and nonafluorobutyl ethyl ether, the volume ratio of which is 2:1-3:2 (v / v). The mixture is first loaded and heated to 46-55°C, then a certain amount of PVDF-HFP powder is added to dissolve it, and inj...

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Abstract

The invention provides a method for assembling power lithium-ion battery, including the sequence-free steps as following: a) unit batteries are provided according to the needed number; b) the unit batteries are placed in a housing; c) the electrical connection is accomplished between the unit batteries; d) flame retardant or heat transfer medium is filled into the housing; and e) the unit batteries are electrically connected with the housing and the encapsulation is completed. The invention also relates to a power lithium-ion battery made by using the method. The power lithium-ion battery assembled by using the method in the invention has an enhanced security.

Description

technical field [0001] The invention relates to a high-capacity battery with improved safety and a manufacturing method thereof. Background technique [0002] With the global energy crisis, the search for green and sustainable energy has become the main development direction of the energy field in the 21st century. Due to the characteristics of high energy density, long cycle life and high working voltage, lithium-ion batteries have become one of the power sources that have attracted much attention. [0003] An important factor that restricts the use of large-capacity lithium-ion power batteries is the safety of the battery. It is manifested that under abuse conditions (such as high temperature, short circuit, overcharge, overdischarge, vibration, extrusion and impact, etc.), the battery will appear Smoke, catch fire, or even explode. Therefore, improving the safety of large-capacity power batteries has become a research focus in this field. At present, the main measures ...

Claims

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Application Information

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IPC IPC(8): H01M2/10H01M2/20H01M2/02H01M2/00C09K21/00H01M4/58H01M6/02H01M10/02H01M6/42H01M10/00H01M50/143H01M50/24H01M50/242H01M50/502
CPCY02E60/12Y02E60/10
Inventor 刘立君张宝文刘巍巍徐艳韩磊周焕升
Owner 北京中润恒动电池有限公司
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