Single-piece thermal runaway prevention structure

Abstract

The utility model discloses a one-piece thermal runaway prevention structure which comprises a flame-retardant protective cylinder, the flame-retardant protective cylinder comprises a thermal expansion layer, the flame-retardant protective cylinder is vertically through, and a battery cell mounting hole is formed in the middle of the flame-retardant protective cylinder. The flame-retardant protective cylinder is sleeved on the single battery to protect the periphery of the single battery, and the thermal expansion layer expands to increase the distance between the adjacent batteries after thermal runaway, so that the flame of one battery cannot spread to other batteries, and the intact condition of other battery cells is ensured. According to the utility model, the barrel-shaped flame-retardant protective barrel is used for carrying out wrapping type protection on the single batteries, even if one battery is in thermal runaway, the thermal expansion layer is heated to expand, so that the distance between the two batteries can be increased, heat is prevented from being conducted to the other battery, and thermal runaway protection can be well carried out on each battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery protection, and in particular relates to a single-piece thermal runaway prevention structure. Background Art

[0002] In order to ensure the safety of the battery pack and / or energy storage cabinet, flame-retardant insulation materials or expansion materials are usually used between the battery cells to delay or block the transfer of heat and flames during thermal runaway, thereby buying time for passengers to escape and reducing property losses.

[0003] However, most of the commonly used thermal insulation pads are aerogel thermal insulation pads placed between two battery cells, which mainly rely on the low thermal conductivity of the aerogel thermal insulation pad itself to avoid heat conduction between adjacent battery cells. The thermal insulation pad is usually shared by a row of single cells, and there is no thermal insulation protection between the single cells in the same row, so thermal protection of the single cells cannot be achieved. Utility Model Content

[0004] In view of the deficiencies described in the above-mentioned prior art, the utility model provides a single-piece thermal runaway prevention structure for protecting a single battery from thermal runaway.

[0005] The technical solution adopted by the utility model is:

[0006] A single-piece structure for preventing thermal runaway includes a flame retardant protective tube, the flame retardant protective tube includes a thermal expansion layer, and the flame retardant protective tube is through-through and a battery cell mounting hole is provided in the middle of the flame retardant protective tube. The flame retardant protective tube is sleeved on a single battery to protect the single battery on all sides. When thermal runaway occurs, the thermal expansion layer expands to increase the distance between adjacent batteries, so that the flame of one battery will not spread to other batteries, ensuring that other batteries are intact.

[0007] As a preferred solution of the utility model, the flame retardant protection tube is provided with a thinning area. In order to avoid excessive increase in volume of a battery pack assembled from single cells, the side wall of the flame retardant protection tube between adjacent single cells is made thinner while protecting the single cells.

[0008] As a preferred solution of the utility model, the thinning area is located at a relative position between the flame retardant protection tube and an adjacent flame retardant protection tube.

[0009] As a preferred solution of the present invention, the flame retardant protective tube is integrally formed.

[0010] As a preferred solution of the utility model, a plurality of flame retardant protective tubes are combined into a honeycomb protective structure. The battery pack can be directly made into an integral structure with multiple battery cell installation holes, which is in a honeycomb shape for quick installation and removal.

[0011] The utility model uses a cylindrical flame retardant protective tube to wrap the single battery for protection. Even if one battery has thermal runaway, the thermal expansion layer will expand due to heat to increase the distance between the two batteries and prevent the heat from being transmitted to another battery, so each battery can be well protected from thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Figure 2 It is a schematic diagram of the use state of the utility model.

[0015] Figure 3 Schematic diagram of the structure of the honeycomb protection structure. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] Embodiment 1:

[0018] A one-piece thermal runaway prevention structure, such as Figure 1 and 2 As shown, it includes a flame retardant protective tube 1, which includes a thermal expansion layer. The thermal expansion layer uses a flame retardant thermal expansion thermoplastic plastic, and the flame retardant protective tube 1 is integrally formed and penetrates from top to bottom. A battery cell mounting hole 2 is provided in the middle of the flame retardant protective tube, and a single battery is installed in the battery cell mounting hole.

[0019] The flame retardant protective tube is put on the single battery 4 to protect the single battery on all sides. When thermal runaway occurs, the thermal expansion layer expands to increase the distance between adjacent batteries. The flame of one battery will not spread to other batteries, ensuring that other battery cells are intact.

[0020] In order to avoid excessive increase in volume when a single cell is assembled into a battery pack, the flame retardant protection tube is provided with a thinning area 3. Preferably, the thinning area is located at a relative position between the flame retardant protection tube and an adjacent flame retardant protection tube. When protecting a single cell, the side wall of the flame retardant protection tube between adjacent single cells is made thinner.

[0021] Furthermore, the cross-sectional shape of the cell mounting hole can be circular, polygonal or irregular, depending on the shape of the battery.

[0022] Example 2

[0023] A one-piece thermal runaway prevention structure, such as Figure 3 As shown, in order to be able to quickly install and disassemble the thermal runaway structure of the entire battery pack, several flame retardant protective tubes can be combined into a honeycomb protective structure. The battery pack can be directly made into an integral structure with multiple battery cell mounting holes. The whole structure is honeycomb-shaped, which is convenient for quick installation and disassembly. The rest is the same as Example 1.

[0024] In the description of this specification, the description of reference terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A single-piece thermal runaway prevention structure, characterized in that: It comprises a flame retardant protective tube (1), wherein the flame retardant protective tube (1) comprises a thermal expansion layer, and the flame retardant protective tube (1) is penetrated from top to bottom and a battery cell mounting hole is provided in the middle of the flame retardant protective tube.

2. The one-piece thermal runaway prevention structure according to claim 1, characterized in that: The flame retardant protective tube is provided with a thinning area.

3. The one-piece thermal runaway prevention structure according to claim 2, characterized in that: The thinned area is located at a relative position between the flame retardant protection tube and an adjacent flame retardant protection tube.

4. The one-piece thermal runaway prevention structure according to claim 3, characterized in that: The flame retardant protective tube is integrally formed.

5. The one-piece thermal runaway prevention structure according to claim 1, characterized in that: A plurality of flame retardant protective tubes are combined into a honeycomb protective structure.

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