CN212485407U

CN212485407U - Structure for delaying thermal runaway

Info

Publication number: CN212485407U
Application number: CN202021232666.7U
Authority: CN
Inventors: 程岩; 张福增; 刘玉龙; 周哲; 陈保国
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-02-05
Anticipated expiration: 2030-06-29

Abstract

The utility model provides a delay thermal runaway's structure, including a plurality of independent settings's modular unit, every modular unit is equipped with a plurality of electric cores, and installation silica gel bubble is cotton and aerogel between two adjacent electric cores, the outside cladding stainless steel casing of modular unit. The structure for delaying thermal runaway of the utility model makes the soft-packaged cell into individual module units, namely the soft-packaged cell is hardened into a hard shell; silica gel foam and aerogel for buffering and heat insulation are added between every two battery cells of each module; the outermost surface is coated with a stainless steel shell, so that the thermal runaway can be effectively slowed down, and the directional eruption of the battery cell in the thermal runaway can be ensured, so that the battery cell can be erupted only at the side of the lug and is not erupted from the edge sealing position; and the mica sheets are used for guiding treatment between every two strings, so that one string is prevented from thermal runaway and rapidly spreads to the other string, and thermal runaway oriented eruption is realized.

Description

Structure for delaying thermal runaway

Technical Field

The utility model belongs to power battery accessories field especially relates to a structure that delays thermal runaway.

Background

The lithium ion battery has the characteristics of small volume, light weight, large capacity, large power density, high energy density, wide applicable temperature range, long cycle life and the like, meets the composite environmental protection requirement, and is widely applied to mobile equipment at present. With the continuous improvement of the energy density of the lithium ion battery, the safety problem becomes a main obstacle of the large-scale application of the lithium ion battery to the electric automobile, and the safety and reliability problems of the lithium ion battery must be solved preferentially when the electric automobile industry is developed. With electric core can cause thermal runaway when receiving overcharge, acupuncture, collision, produce a large amount of heats, if protective measures such as not taking the heat dissipation, thermal runaway electric core will be fast to electric core transmission heat on every side, causes a large amount of electric cores to take place interlocking thermal runaway, and then causes the battery package to catch fire or even explode, seriously threatens the problem of personnel's safety.

Disclosure of Invention

In view of this, the utility model aims at providing a structure that delays thermal runaway to a speed that can effectively slow down electric core thermal runaway is provided, the structure that delays thermal runaway that slows down electric core thermal spread.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a delay thermal runaway's structure, includes a plurality of independent setting's modular unit, every modular unit is equipped with a plurality of electric cores, installs silica gel bubble cotton and aerogel between two adjacent electric cores, the outside cladding stainless steel casing of modular unit.

Further, the inside even number of electric core of modular unit is equipped with silica gel bubble cotton and aerogel between two adjacent electric cores, and silica gel bubble cotton and aerogel interval arrangement, the top of aerogel is equipped with the flat structure, and the top of aerogel covers two electric cores completely and forms an electric core unit, and the top coating silica gel of electric core unit.

Furthermore, the cross section of the aerogel is of an L-shaped structure, and the top of the L-shaped structure completely covers two battery cells to form a battery cell unit.

Furthermore, the number of the battery cells arranged in the module unit is 12.

Further, the stainless steel shell comprises a stainless steel cover and insulation parts arranged at two ends of the stainless steel cover, the cross section of the stainless steel cover is of a U-shaped groove structure, the stainless steel cover is arranged above the module unit, mica sheets are arranged between two adjacent battery cell modules, and two ends of each mica sheet penetrate through the insulation parts close to the mica sheets respectively to be in contact with the stainless steel shell.

Furthermore, a plurality of copper bars are arranged on the insulating part.

Furthermore, an insulating layer is sprayed inside the stainless steel cover.

Compared with the prior art, delay thermal runaway's structure have following advantage:

(1) the structure for delaying thermal runaway of the utility model makes the soft-packaged cell into individual module units, namely the soft-packaged cell is hardened into a hard shell; silica gel foam and aerogel for buffering and heat insulation are added between every two battery cells of each module; the outermost surface is coated with a stainless steel shell, so that the thermal runaway can be effectively slowed down, and the directional eruption of the battery cell in the thermal runaway can be ensured, so that the battery cell can be erupted only at the side of the lug and is not erupted from the edge sealing position; and the mica sheets are used for guiding treatment between every two strings, so that one string is prevented from thermal runaway and rapidly spreads to the other string, and thermal runaway oriented eruption is realized.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded view of a structure for delaying thermal runaway according to an embodiment of the present invention;

FIG. 2 is a schematic front view of the positional relationship between the insulating member and the mica sheet according to the embodiment of the present invention;

figure 3 is the embodiment of the utility model provides a cross-sectional view of silica gel bubble cotton, electric core, aerogel position relation.

Description of reference numerals:

1-mica sheet; 2-an insulator; 3-soaking the cotton with silica gel; 4-electric core; 5-aerogel; 6-stainless steel cover.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The utility model provides a structure of delaying thermal runaway, as shown in fig. 1 to 3, includes the modular unit of a plurality of independent settings, and every modular unit is equipped with a plurality of electric cores 4, installs silica gel bubble cotton 3 and aerogel 5 between two adjacent electric cores 4, the outside cladding stainless steel casing of modular unit.

The inside even number of electric core 4 of module unit, two adjacent electric cores directly are equipped with the cotton 3 of silica gel bubble and aerogel 5, and the cotton 3 of silica gel bubble and 5 interval arrangements of aerogel, the top of aerogel 5 is equipped with the flat structure, and two electric cores 4 are covered completely at the top of aerogel 5 and form an electric core unit, and the top coating silica gel of electric core unit.

The silica gel bubble of setting is cotton 3, when absorbing 4 inflation of electric core, can the separation heat, and the cotton 3 temperature toleration of silica gel bubble is high, but instantaneous temperature resistant 400 ℃, can effectively slow down heat together with aerogel 5 and stretch, and the cotton PU bubble of 3 more commonly used of silica gel bubble is cotton to be compared, and weatherability and compression resilience performance are good, can be in the whole life cycle of electric core 4 and module, provide lasting invariable effort for electric core 4 breathes and the inflation.

Preferably, the cross section of the aerogel 5 is an L-shaped structure, and the top of the L-shaped structure completely covers two battery cells 4 to form a battery cell unit. When two electric core 4 thermal runaway, steam can not ripple other electric core 4, at the top coating silica gel of two electric core 4 simultaneously to prevent that electric core 4 erupts at the top, realizes directional exhaust, so select silica gel because silica gel temperature resistance is good.

Preferably, the number of the battery cells 4 arranged in the module unit is 12, and the electric energy provided by the number is convenient to use directly.

Stainless steel casing includes stainless steel lid 6 and the insulator 2 of both ends installation, and stainless steel lid 6's cross section is U type groove structure, and stainless steel lid 6 is installed module unit top is equipped with mica sheet 1 between two adjacent electric core modules, and the insulator 2 rather than being close to is passed respectively at the both ends of mica sheet 1, and with the contact of stainless steel casing, the stainless steel casing is located insulator 2 is outside, can separate the heat that two strings of electricity core 4 between stretch when the thermal runaway takes place, and mica sheet 1 plays the guide effect, realizes directional exhaust.

Be equipped with a plurality of copper bars on insulating part 2, make things convenient for heat conduction.

The both ends of stainless steel lid 6 are equipped with the draw-in groove, and 2 upper portions of insulating part are equipped with joint head, joint head and draw-in groove cooperation for stainless steel lid 6 and insulating part 2 joint.

The temperature resistance of the stainless steel cover 6 can reach more than 800 ℃, when thermal runaway occurs, under the synergistic effect of silica gel and L-shaped aerogel 5, the battery cell 4 is prevented from erupting from the upper edge sealing position and the erupted gas is thermally spread on the edge sealing of the battery cell 4, and the directional eruption of the battery cell 4 when thermal runaway is ensured, so that the battery cell 4 can only erupt at the side of the lug, the eruption is not carried out from the edge sealing position, the strength of the module can be increased, and modularization is realized.

The inside of the stainless steel cover 6 is subjected to electrostatic spraying insulation treatment, so that the insulation performance and the safety of the whole module are ensured.

The scheme of the structure for delaying thermal runaway makes the soft-packaged battery cell into module units one by one, namely the soft-packaged battery cell is hardened into a shell; a buffer heat-insulation silica gel foam and aerogel 5 are added between every two battery cells of each module; the outermost surface is coated with a stainless steel shell, so that the thermal runaway can be effectively slowed down, and the directional eruption of the battery cell in the thermal runaway can be ensured, so that the battery cell can be erupted only at the side of the lug and is not erupted from the edge sealing position; and the mica sheets are used for guiding treatment between every two strings, so that one string is prevented from thermal runaway and rapidly spreads to the other string, and thermal runaway oriented eruption is realized.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A structure for delaying thermal runaway, comprising: the battery pack comprises a plurality of independently arranged module units, each module unit is provided with a plurality of battery cells, silica gel foam and aerogel are arranged between every two adjacent battery cells, and the outside of each module unit is coated with a stainless steel shell.

2. A structure for delaying thermal runaway as claimed in claim 1, wherein: the module unit is inside even number electric core, is equipped with silica gel bubble cotton and aerogel between two adjacent electric cores, and silica gel bubble cotton and aerogel interval arrangement, the top of aerogel is equipped with dull and stereotyped structure, and the top of aerogel covers two electric cores completely and forms an electric core unit, and the top coating silica gel of electric core unit.

3. A structure for delaying thermal runaway as claimed in claim 2, wherein: the cross section of aerogel is L type structure, and the top of L type covers two electric cores completely and forms electric core unit.

4. A structure for delaying thermal runaway as claimed in claim 2, wherein: preferably, the number of the battery cells arranged in the module unit is 12.

5. A structure for delaying thermal runaway as claimed in claim 1, wherein: the stainless steel shell comprises a stainless steel cover and insulating parts arranged at two ends of the stainless steel cover, the cross section of the stainless steel cover is of a U-shaped groove structure, the stainless steel cover is arranged above the module unit, mica sheets are arranged between two adjacent battery cell modules, and two ends of each mica sheet penetrate through the insulating parts close to the mica sheets respectively to be in contact with the stainless steel shell.

6. A structure for delaying thermal runaway as claimed in claim 5, wherein: and a plurality of copper bars are arranged on the insulating part.

7. A structure for delaying thermal runaway as claimed in claim 1, wherein: and an insulating layer is sprayed inside the stainless steel cover.