阅读说明：本技术 一种电池包灌胶方法 (Method for encapsulating battery pack ) 是由 陈杰 汤龙江 于 2019-09-28 设计创作，主要内容包括：本发明提供了一种电池包灌胶方法,在电芯间隙之间不同位置灌注不同种类的胶体,保证电芯良好散热的同时也提高了整体电池包的能量密度,从而进一步保证了整车的续航里程。本发明提供的一种电池包灌胶方法,利用支架将单体电芯固定之后,在所述单体电芯之间间隙所述单体电芯下方部位即电池组底层灌注高密度灌封胶,所述高密度灌封胶厚度为所述单体电芯高度的20%~25%；在所述电池组中层灌注低密度灌封胶,所述低密度灌封胶厚度为所述单体电芯高度的50%~60%；在电池组上层灌注高密度灌封胶,所述高密度灌封胶厚度为所述单体电芯高度的20%~25%。(The invention provides a battery pack potting method, wherein different types of colloids are poured into different positions among cell gaps, so that the good heat dissipation of cell cores is ensured, and the energy density of an integral battery pack is also improved, so that the endurance mileage of a whole vehicle is further ensured.)

1. A battery pack glue pouring method is characterized in that after monomer battery cores are fixed through a support, high-density pouring glue is poured into the lower portion of the monomer battery cores, namely the bottom layer of a battery pack, of a gap between the monomer battery cores, and the thickness of the high-density pouring glue is ~ 25% of the height of the monomer battery cores;

pouring a low-density pouring sealant into the middle position of the single battery cells, namely the middle layer of the battery pack, in the gap between the single battery cells, wherein the thickness of the low-density pouring sealant is ~ 60% of the height of the single battery cells;

and filling high-density pouring sealant in the upper part of the battery pack at the upper part of the gaps among the monomer battery cells, wherein the thickness of the high-density pouring sealant is 20 percent ~ 25 percent of the height of the monomer battery cells.

2. The method for pouring the battery pack with the sealant according to claim 1, wherein the density of the high-density pouring sealant is 1g/cm³The above.

3. The method of claim 1, wherein the thermal conductivity of the high-density potting adhesive is greater than 1.0.

4. The method of claim 1, wherein the low-density potting adhesive has a density of 0.6g/cm³The following.

5. The method of claim 1, wherein the low-density potting adhesive has a thermal conductivity of 0.3 or less.

Technical Field

The invention relates to the technical field of design and manufacture of power supplies of electric automobiles, in particular to a battery pack glue pouring method.

Background

With the increasing demand for energy conservation and environmental protection, electric vehicles have become an important future development direction in the automobile industry. The battery pack is formed by fixing hundreds of single batteries through a bracket and connecting electrode plates in a specific series-parallel connection mode, so that a power source is provided for the whole vehicle, and the safety and the energy density of the battery pack become important measurement standards.

At present, the safety of the battery pack is improved by pouring glue between the single battery cores in the battery pack. However, the colloids differ in thermal conductivity and density, with higher thermal conductivity and higher density. If the colloid with lower density is adopted, higher energy density can be obtained, but the heat conductivity of the battery is poorer, so that the heat dissipation of the whole vehicle is influenced; if the colloid with high thermal conductivity coefficient is adopted, higher thermal conductivity can be obtained, but the weight is also higher, the energy density of the battery is influenced, and the endurance mileage of the electric automobile is further influenced.

The existing glue filling method is needed to ensure the safety of the battery pack and simultaneously ensure the higher energy density of the battery pack so as to improve the endurance mileage of the electric automobile.

Disclosure of Invention

According to the battery pack glue filling method provided by the invention, after the single battery cells are fixed through the bracket, different types of glue are filled in different positions of the gaps between the battery cells, so that the safety of the battery pack with good heat dissipation of the battery cells is ensured, the energy density of the battery pack is also improved, and the endurance mileage of an electric vehicle is ensured.

The battery pack pouring method provided by the embodiment of the invention comprises the steps of fixing monomer battery cores by utilizing a support, pouring high-density pouring sealant at the lower part of the monomer battery cores, namely the bottom layer of a battery pack, in a gap between the monomer battery cores, wherein the thickness of the high-density pouring sealant is ~% of the height of the monomer battery cores, pouring low-density pouring sealant at the middle part of the monomer battery cores, namely the middle layer of the battery pack, in the gap between the monomer battery cores, wherein the thickness of the low-density pouring sealant is 50% ~% of the height of the monomer battery cores, pouring high-density pouring sealant at the upper part of the monomer battery cores, namely the upper layer of the battery pack, wherein the thickness of the high-density pouring sealant is 20% ~% of the height of the monomer battery.

Wherein the density of the high-density pouring sealant is 1g/cm³The above.

Wherein, the heat conductivity coefficient of the high-density pouring sealant is more than 1.0.

Wherein the density of the low-density pouring sealant is 0.6g/cm³The following.

Wherein the heat conductivity coefficient of the low-density pouring sealant is less than 0.3.

According to the battery pack glue pouring method provided by the invention, after the battery cores are fixed by the support, high-density pouring glue is poured on the bottom layer and the upper layer of the battery pack in the gap between the single battery cores, and low-density pouring glue is poured in the middle, so that the safety of the battery pack with good heat dissipation of the battery cores is ensured, the energy density of the battery pack is also improved, and the endurance mileage of an electric automobile is further ensured.

Drawings

Fig. 1 is a schematic diagram illustrating a battery pack potting structure according to an embodiment of the present invention.

Detailed Description

The embodiments of the present invention will be described more fully hereinafter with reference to the accompanying drawings.

Fig. 1 is a schematic view of a battery pack potting structure according to the present invention. As shown in fig. 1, the individual cells are fixed by a bracket 1 and connected by electrode connecting pieces to form a specific series-parallel connection mode, so as to provide power for the whole vehicle.

And glue is filled in gaps among the single battery cores in the battery pack to further improve the safety of the battery pack.

Firstly, pouring high-density pouring sealant at the lower part 2 of the single battery cells, namely the bottom layer of the battery pack, of the gap between the single battery cells, wherein the thickness of the pouring sealant is 20% ~ 25% of the height of the single battery cells.

In the embodiment of the invention, 18650 cylindrical single battery cells are adopted, the thickness of the glue poured into the bottom layer of the battery pack is 15mm, and the glue density is 1.0g/cm³The thermal conductivity was 1.0.

The higher the pouring sealant density is, the higher the heat conductivity coefficient is, and the better the heat dissipation performance is. The high-density colloid is poured into the bottom layer of the battery pack, the heat conduction performance is good, the electric core is further reinforced, the good heat dissipation of the single electric core can be ensured, and the phenomenon that the electric core has too high temperature and the electric core performance is influenced is avoided.

Secondly, pouring low-density pouring sealant at the middle position 3 of the single battery cells, namely the middle layer of the battery pack, of the gap between the single battery cells, wherein the thickness of the pouring sealant is 50% ~ 60% of the height of the single battery cells.

In the embodiment of the invention, the thickness of the middle layer perfusion colloid in the battery pack is 35mm, and the colloid density is 0.6g/cm³The thermal conductivity was 0.3.

The middle layer of the battery pack occupies half or even more of the total volume and is filled with low-density colloid, so that the overall quality of the battery pack is effectively reduced, the energy density of the battery pack is improved, and the endurance mileage of the whole vehicle is further ensured.

Thirdly, pouring high-density pouring sealant at the upper position 4 of the single battery cells in the gap between the single battery cells, namely the upper layer of the battery pack, wherein the thickness of the pouring sealant is 20% ~ 25% of the height of the single battery cells.

In the embodiment of the invention, the upper layer of the battery pack is filled with colloid with the same thickness and density as the bottom layer, namely the battery pack is 15mm thick and has the density of 1.0g/cm³The colloid of (2). The good heat conductivity of colloid guarantees that the heat that electric core and connection piece contact position produced can be in time rapid giving off.

The invention fills the colloid into the whole battery pack, further ensures the structural safety of the battery pack, effectively considers the heat dissipation of the battery core and the energy density of the whole battery pack, and ensures the endurance mileage of the whole vehicle.

According to the battery pack glue pouring method provided by the invention, after the battery cores are fixed by the support, high-density pouring glue is poured on the bottom layer and the upper layer of the battery pack in the gap between the single battery cores, and low-density pouring glue is poured in the middle, so that the safety of the battery pack with good heat dissipation of the battery cores is ensured, the energy density of the battery pack is also improved, and the endurance mileage of an electric automobile is further ensured.

The above-mentioned embodiments are merely illustrative of the technical ideas and features of the present invention, and are not intended to limit the present invention, and any modifications, equivalents and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.