A method for improving a battery pack by utilizing a composite sandwich plate structure

A composite material and structural improvement technology, applied in the field of composite materials, can solve problems such as hindering the improvement of the energy density of battery packs and increase the weight of trams, and achieve the effect of improving energy density, eliminating the need for assembly and reducing weight

Pending Publication Date: 2018-12-14
北京博简复才技术咨询有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical casing and the battery pack casing are mostly made of metal. The combination of the two structures greatly increases the weight of the tram and hinders the improvement of the energy density of the battery pack.

Method used

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  • A method for improving a battery pack by utilizing a composite sandwich plate structure
  • A method for improving a battery pack by utilizing a composite sandwich plate structure
  • A method for improving a battery pack by utilizing a composite sandwich plate structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Provide battery pack design with prismatic cells

[0040] According to the size of the battery box for small passenger cars, make a 1300mm×931mm sandwich plate battery pack, including all modules, and the total number of battery cells is consistent with this type of commercial battery pack. The design is as follows:

[0041] (1) The bottom angle of the isosceles trapezoidal corrugation of the interlayer is 75°, the upper bottom is 148mm, the lower bottom is 207mm, and the height is 110mm. The panel adopts [0° / +45° / 90° / -45°]s8-layer layup method, the material is X850 prepreg, and the core material can be [0° / +45° / 90° / -45°]4 layer by layer. The total weight of the simple sandwich panel is calculated as: 5.2kg, plus some additional binding materials and adhesives, it is about 10kg (estimated), which is called the weight of the structure.

[0042] (2) A total of five corrugations are set, and the two adjacent corrugations are in the relationship between the upper and low...

Embodiment 2

[0045] Provide battery pack design with cylindrical cells

[0046]Cylindrical battery cells have a small capacity, so the quantity requirement is large. They should also be bundled with thermoplastic prepreg tapes and connected to long strip battery modules, and then placed in composite sandwich panels.

[0047] Design a battery pack that has the same energy as a square cell but uses 21700 cylindrical cells.

[0048] The performance of domestic 21700 batteries is shown in the table below.

[0049] type

size

Capacity / Ah

voltage / v

Weight / g

Energy density (wh / kg)

21700 cylindrical

21*70

4

3.7

69.3

214

[0050] (1) According to the principle of consistent energy, use at least 1776 21700 batteries of this type; design ten modules, each module has 178 batteries, such as Figure 5 shown. Due to the large number of batteries, the batteries should be arranged tangentially and closely, and insulating tapes with negligible thickn...

Embodiment 3

[0055] The design scheme of providing battery packs with soft pack cells

[0056] Soft-pack batteries packaged in aluminum-plastic film are generally very thin, with a thickness of less than one centimeter. The soft-pack batteries are modularized in advance and become square shells to facilitate subsequent installation.

[0057] (1) First of all, several soft-packed batteries are bundled up in advance, and the electrodes can be connected to each other through the circuit board by welding to form a battery unit with a certain voltage. This battery unit is similar to a hard-shell battery. easy to fix,

[0058] (2) Process the above-mentioned square battery module that has been modularized through the soft package into a module by winding prepreg tape, and the remaining printed circuit boards for battery management functions and aluminum alloy plates for cooling are as shown in Example 1 way to install.

[0059] (3) The module enters the interlayer board, the fixation of the mo...

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Abstract

The invention discloses a method for improving a battery pack by utilizing a composite sandwich plate structure. The improved apparatus comprises a corrugated plate battery pack, and the battery packfurther comprises a component and a lithium power battery unit; a sandwich layer and skin material; a bus bar; a printed circuit board for collecting temperature, voltage and other signals; Temperature controller. According to the structure of corrugated sandwich board, PCB and temperature controller are arranged in the space between corrugated board and panel, and then several cell electrodes areput into the space between corrugated board and panel perpendicular to the panel upward to form modules of specific voltage and capacitance, and finally a plurality of modules are assembled to form abattery pack. The invention no longer needs the module end plate, tray, upper cover and other components with metal texture in the traditional battery pack, and only the composite corrugated plate with high specific strength sandwich structure is used as the battery container, which effectively improves the energy density, lightens the weight of the battery pack and balances the thermal conductivity.

Description

technical field [0001] The design of the invention relates to the field of composite materials, in particular to a method for improving battery packs by utilizing a sandwich plate structure of composite materials. Background technique [0002] At present, the battery packs of electric vehicles are mostly connected in series or in parallel with quadrangular prisms, cylinders and soft packs, and are installed in the mechanical casing to form a battery module. Multiple battery modules are assembled in series or in parallel to form a battery pack. Battery management system and thermal management system for sensors and controller, assembled in one housing. Among them, the mechanical shell is generally a cube surrounded by four end plates and two upper and lower plates, and the shell is generally composed of a battery box cover and a tray. The mechanical casing and the battery pack casing are mostly made of metal. The combination of the two structures greatly increases the weight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/10H01M2/20H01M10/42H01M10/48H01M50/213H01M50/231H01M50/233H01M50/244H01M50/249H01M50/258H01M50/284H01M50/507
CPCH01M10/425H01M10/486H01M50/20H01M50/50Y02E60/10
Inventor 张博明兰祥李静雯李宏福孙义亮
Owner 北京博简复才技术咨询有限公司
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