Power cell negative plate, cell, and power cell buffer battery pack

A technology of power battery and negative electrode sheet, applied in battery electrodes, non-aqueous electrolyte battery electrodes, batteries, etc., can solve problems such as limited protection capability of power battery packs

Inactive Publication Date: 2014-07-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the technical solution mentioned in this patent is limited by materials and process conditions, so the polarization resistance of the pulse buffer battery pack can only be 0.5-0.1 times that of the power battery pack.
This kind of pulse buffer battery pack has limited protection ability for the power battery pack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12

[0032] See Table 1 for the positive electrode active material, dressing thickness, dressing area, negative electrode active material, dressing thickness, and dressing area of ​​power batteries A1-A12. The parameters of hard carbon in each embodiment are shown in Table 2.

Embodiment 13-24

[0036] 89 power batteries A1-A12 are respectively connected in series to form buffer battery packs B1-B12. Connect B1-B12 to CD1 in parallel to form power battery modules D1-D12. Among them, the terminal voltage of 100 power batteries CA1 connected in series is equal to the terminal voltage of 89 power batteries A1-A12 connected in series to form a buffer battery pack.

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PUM

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Abstract

The invention provides a power cell negative plate. The negative plate comprises a negative active material, a negative current collector, a conductive agent, and a negative binding agent; wherein the negative active material is hard carbon, and the thickness of the coating on the negative plate is 2 to 5 times as long as the average particle size of the negative active material. The invention also provides a power cell comprising the negative plate and a buffer battery pack. The internal resistance of the power cell is less than 0.5 m[Omega], and the capacity of the power cell is lower than 30 Ah. The buffer battery pack, which is prepared by serially connecting the power cells, has the advantages of low internal resistance and small capacity. The buffer battery pack can be applied to the power buffer system of an electric vehicle, is capable of effectively resisting the harms generated by the braking impulse current, and can effectively maintain the circulation performance and safety performance of the vehicle-mounted power cell module after the pulse current impact.

Description

technical field [0001] The invention belongs to the field of power batteries, and in particular relates to a power battery negative plate, a battery and a power battery buffer battery pack. Background technique [0002] In recent years, with the impact of the oil crisis and high-level requirements for environmental protection, hybrid vehicles and pure power vehicles have become the main development trend of automobiles. As the most important source of power for hybrid electric vehicles and pure electric vehicles—vehicle power battery module has become a research hotspot. [0003] The braking method of hybrid vehicles and pure electric vehicles is different from that of traditional fuel vehicles. The braking method of fuel vehicles is mechanical brakes. The braking method of pure electric vehicles is regenerative braking, which feeds back the energy generated during braking to the vehicle battery, which not only avoids energy waste, but also increases the driving range. The...

Claims

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Application Information

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IPC IPC(8): H01M4/13H01M4/62H01M10/42
CPCH01M4/583H01M4/625H01M10/0525H01M2220/20Y02E60/10
Inventor 程耀波江文锋
Owner BYD CO LTD
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