Lithium iron phosphate lithium ion battery as well as electricity quantity status test method and pairing method thereof

A lithium-ion battery and lithium iron phosphate technology, which is applied in non-aqueous electrolyte battery electrodes, secondary batteries, and measuring electrical variables, etc., can solve the problem of low battery pack life, unbalanced lithium-ion battery power, and inability to know the lithium-ion battery power Status and other issues to achieve the effect of ensuring quality and life

Inactive Publication Date: 2012-05-16
SHENZHEN HAIYING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the above-mentioned characteristics of lithium iron phosphate, the current state of charge of the lithium-ion battery cannot be known through the measurement of the open circuit voltage of the lithium-ion battery. If obtained in the step) are directly paired to form a battery pack, the power of the lithium-ion batteries in the paired battery pack may be unbalanced, resulting in a quality problem of low life of the battery pack

Method used

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  • Lithium iron phosphate lithium ion battery as well as electricity quantity status test method and pairing method thereof
  • Lithium iron phosphate lithium ion battery as well as electricity quantity status test method and pairing method thereof
  • Lithium iron phosphate lithium ion battery as well as electricity quantity status test method and pairing method thereof

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Effect test

Embodiment 1

[0034] This embodiment provides a lithium-ion battery suitable for use. The lithium-ion battery can be a lithium-ion battery of various specifications or shapes at present, including: a wound battery cell, which is stacked by a stacked positive electrode sheet, negative electrode sheet, and separator. or coiled. Wherein the separator is spaced between the positive electrode sheet and the negative electrode sheet. The difference between this lithium ion battery and the lithium iron phosphate battery in the prior art is that:

[0035] In addition to the main material of lithium iron phosphate, the positive electrode material coated on the positive electrode sheet also includes a second auxiliary positive electrode material whose discharge platform is higher than that of lithium iron phosphate.

[0036] It can be seen from the above that, applying the technical solution of this embodiment, in addition to the main material lithium iron phosphate, the positive electrode material al...

Embodiment 2

[0055] image 3 It is a schematic flowchart of a method for detecting the state of charge of a lithium-ion battery provided in this embodiment. The lithium ion battery is the lithium ion battery described in Example 1.

[0056] see image 3 As shown, the process mainly includes:

[0057] Step 301: Measure the open circuit voltage of the lithium ion battery.

[0058] Its test method can be any one in the prior art.

[0059] Step 302: If the open circuit voltage is lower than the resting voltage corresponding to the fully charged state corresponding to the second auxiliary positive electrode material, perform step 303; otherwise, perform step 304.

[0060] For example, when the second auxiliary positive electrode material is lithium manganate, the full charge static voltage corresponding to lithium manganate is about 3.85V, that is, in this step, when the current open circuit voltage V0<3.85V, it is considered that the current lithium The lithium iron phosphate, the main po...

Embodiment 3

[0066] Figure 4 It is a schematic flow chart of the pairing method for the lithium-ion battery provided in Embodiment 1.

[0067] see Figure 4 As shown, this embodiment is relative to image 3 The only difference is that:

[0068] After step 304, also include battery pairing step:

[0069] Step 401: According to the capacity level of each lithium ion battery, pair each lithium ion battery to form a battery pack.

[0070] In the case of ensuring that the current lithium-ion batteries to be paired are fully charged, the lithium-ion batteries in this embodiment are paired according to the original capacity level of each lithium-ion battery, and are composed of multiple lithium-ion battery cells Li-ion battery pack.

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Abstract

The invention relates to the field of lithium ion batteries, and discloses a lithium ion phosphate lithium iron battery as well as an electricity quantity status test method and a pairing method thereof, wherein the lithium ion battery comprises a battery cell which is formed by laminating or winding an anode plate, a cathode plate and a diaphragm, wherein the diaphragm is spaced between the anode plate and the cathode plate; anode materials coated on the anode plate comprise lithium iron phosphate and a second auxiliary anode material; and the second auxiliary anode material is an anode material with an electro-discharge platform higher than that of lithium iron phosphate. By applying the technical scheme of the embodiment of the invention, the current electricity quantity status of the lithium ion battery can be measured and acquired by virtue of simple voltage measurement of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery and a method for detecting the state of electricity and a pairing method thereof. Background technique [0002] At present, lithium phosphate batteries are mainly used in power batteries. Power batteries usually cannot be completed by single cells. They need to be connected in series and parallel to form a group. Before forming a group, the voltage, internal resistance and capacity of the cells need to be matched. During the pairing process of the power battery pack, the better the balance of the power of each lithium-ion battery in the battery pack, the better the performance of the entire power battery pack; otherwise, the power of each lithium-ion battery in the battery pack is different. In the process of use, the battery with low power may be over-discharged. During the charging process, the battery with a large power may be over-charged, resulting ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M4/13H01M10/42H01M10/04H01M10/058G01R31/36
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 唐道平陶芝勇曾纪术郭永兴曾坚义
Owner SHENZHEN HAIYING TECH
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