Soft package battery cell thermal safety protection device

Abstract

The utility model provides a thermal safety protection device for a soft package battery cell, which relates to the technical field of lithium ion batteries and comprises a battery cell component and a shell component, a containing cavity used for containing the battery cell assembly is formed in the shell assembly, heat dissipation notches are formed in the upper portions of the two sides of the shell assembly, and the heat dissipation notches are sealed through glue spraying; an upper structural adhesive is arranged on the upper surface of the battery cell assembly, a lower structural adhesive is arranged on the lower surface of the battery cell assembly, the battery cell assembly comprises a plurality of soft package battery cells, the plurality of soft package battery cells are stacked in the thickness direction of the battery cell assembly, every two soft package battery cells form a battery cell group, and a heat insulation plate is arranged between every two adjacent battery cell groups. The heat dissipation notches are located in the side edges of the soft package battery cells, and the ends, provided with the tabs, of the multiple soft package battery cells are jointly filled with tab glue. The problem that thermal runaway directional eruption cannot be realized, so that a battery pack has a relatively large potential safety hazard is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium - ion batteries, and particularly relates to a thermal safety protection device for a soft - package battery cell. Background Art

[0002] With the development of the new - energy industry, electric vehicles are more and more widely used. Soft - package lithium - ion batteries are widely used in the market because of their advantages such as light weight, high specific capacity, good safety performance, small internal resistance, and flexible design. With the improvement of the energy density of lithium - ion batteries, the safety of lithium - ion batteries has attracted more and more attention. After the thermal runaway of the battery cell, the high - temperature gas generated by the thermal runaway generally exhausts through the tab end or the sealing edge surface. When exhausting through the tab end, because the high - temperature gas ejected by the thermal runaway will carry the internal conductive materials and particles of the battery cell, and at the same time, the tab end is connected to the high - voltage circuit, the high - temperature conductive air flow passing through the tab position is likely to cause arcing, triggering the thermal runaway of non - thermal - runaway battery cells, and even arcing through the upper cover of the box body, causing fire; when exhausting through the sealing edge surface, because the high - temperature gas ejected by the thermal - runaway battery cell sweeps and bakes the sealing edge position of the surrounding non - thermal - runaway battery cells, the sealing edge glue of the surrounding battery cells melts and leaks liquid, which is likely to cause thermal diffusion. The structure of the existing soft - package power - battery module cannot achieve directional ejection of thermal runaway, resulting in great potential safety hazards in the battery pack. Summary of the Utility Model

[0003] Aiming at the deficiencies in the prior art, the utility model provides a thermal safety protection device for a soft - package battery cell, which solves the problem that the inability to achieve directional ejection of thermal runaway leads to great potential safety hazards in the battery pack.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A thermal safety protection device for a soft - package battery cell includes: a battery - cell assembly and a housing assembly;

[0006] An accommodation cavity for accommodating the battery - cell assembly is formed inside the housing assembly, and heat - dissipation gaps are provided above both sides of the housing assembly, and the heat - dissipation gaps are closed by spraying glue.

[0007] An upper structural adhesive is provided on the upper surface of the battery - cell assembly, and a lower structural adhesive is provided on the lower surface of the battery - cell assembly. The battery - cell assembly includes a plurality of soft - package battery cells, and the plurality of soft - package battery cells are stacked in their thickness direction. Each two soft - package battery cells form a battery - cell group, and a heat - insulation board is provided between adjacent battery - cell groups. The heat - dissipation gap is located on the side of the soft - package battery cell, and the ends of the plurality of soft - package battery cells with tabs are jointly potted with tab glue.

[0008] Preferably, the upper structural adhesive includes three long - strip - shaped structural adhesives arranged at intervals, and the long - strip - shaped structural adhesives are perpendicular to the soft - package battery cells.

[0009] Preferably, the heat insulation board includes a foam layer and two mica sheets, the two mica sheets are respectively located on both sides of the foam layer, and a double-sided adhesive layer is provided between the mica sheet and the foam layer.

[0010] Preferably, the housing assembly includes an upper box cover and a lower box body with an upper opening.

[0011] Preferably, the inner wall of the housing assembly is provided with a fireproof coating.

[0012] The utility model has the following beneficial effects:

[0013] The soft-pack battery cells are sealed with structural parts such as structural adhesives on the upper surface, lower surface, and tab positions, guiding the exhaust gas of the thermally out-of-control battery cells to exhaust directionally from the heat dissipation gaps above both sides of the housing assembly, solving the problem of random exhaust of the soft-pack battery cells during thermal runaway.

[0014] Other advantages, objectives, and features of the utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 is a schematic cross-sectional view of the heat insulation board structure of the utility model.

[0017] In the above-mentioned drawings: 1, upper structural adhesive; 2, lower structural adhesive; 3, soft-pack battery cell; 4, heat insulation board; 5, tab adhesive; 6, foam layer; 7, mica sheet; 8, double-sided adhesive layer; 91, upper box cover; 92, lower box body. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the technical means, creative features, achieved objectives, and functions of the utility model more clear and easy to understand, the technical solutions in the utility model will be further described below with reference to the drawings and embodiments.

[0019] Please refer to Figure 1 As shown, a thermal safety protection device for soft-pack battery cells includes: a battery cell assembly and a housing assembly; a receiving cavity for receiving the battery cell assembly is formed inside the housing assembly, and heat dissipation gaps are provided above both sides of the housing assembly, and the heat dissipation gaps are closed by spraying glue; an upper structural adhesive 1 is provided on the upper surface of the battery cell assembly, a lower structural adhesive 2 is provided on the lower surface of the battery cell assembly, the battery cell assembly includes a plurality of soft-pack battery cells 3, the plurality of soft-pack battery cells 3 are stacked in their thickness direction, every two soft-pack battery cells 3 form a battery cell group, a heat insulation board 4 is provided between adjacent battery cell groups, the heat dissipation gaps are located on the sides of the soft-pack battery cells 3, and an end of the plurality of soft-pack battery cells 3 where the tabs are provided is jointly potted with a tab adhesive 5.

[0020] The upper structural adhesive 1 and the lower structural adhesive 2 are provided to form a protective film on the upper and lower surfaces of the soft-pack battery cell 3, reducing the risks of the battery cell being affected by moisture, oxidized, and corroded, and extending the service life of the battery cell. The heat insulation board 4 is provided to play a role in fire prevention and heat insulation, separating the soft-pack battery cell 3 from the thermally runaway battery cell. One end of the soft-pack battery cell 3 where the tab is located is potted with tab glue 5, potting the tab, the sampling wire harness, and the busbar as a whole in a closed space, isolating them from the high-temperature conductive air flow during thermal runaway, and playing the roles of surface protection, insulation, and fixation. The soft-pack battery cell 3 is blocked with structural parts such as structural adhesive on the upper surface, lower surface, and tab positions, and the heat dissipation gap position is entirely sprayed with glue, meeting the requirements for the air flow to spray out from the thermally runaway battery cell and ensuring that the edges of the surrounding battery cells are not roasted by high temperature during thermal runaway, protecting the surrounding battery cells, and guiding the exhaust gas of the thermally runaway battery cell to exhaust directionally from the heat dissipation gaps above both sides of the housing assembly, solving the problem of random exhaust during the thermal runaway of the soft-pack battery cell.

[0021] Further, as Figure 1 shown, the upper structural adhesive 1 includes three strip-shaped structural adhesives arranged at intervals, the strip-shaped structural adhesives are perpendicular to the soft-pack battery cell 3, and while playing a protective role, the strip-shaped structural adhesives can also connect several soft-pack battery cells 3 to ensure the stability of the battery cell structure.

[0022] Further, as Figure 2 shown, the heat insulation board 4 includes a foam layer 6 and two mica sheets 7, the two mica sheets 7 are respectively located on both sides of the foam layer 6, and a double-sided adhesive layer 8 is provided between the mica sheet 7 and the foam layer 6. The foam layer 6 is made of flame-retardant foam, which not only achieves the function of flame retardance; when the foam layer 6 melts and burns, it can also form a porous structure, cooperating with the mica sheet 7 to form a fireproof and heat-insulating layer for heat-insulating protection.

[0023] Further, as Figure 1 shown, the housing assembly includes an upper box cover 91 and a lower box body 92 with an upper opening, and the upper box cover 91 and the lower box body 92 cooperate to wrap and fix the soft-pack battery cell 3.

[0024] Further, to improve the overall fireproof effect, the inner wall of the housing assembly is provided with a fireproof coating. The fireproof coating is an existing technology.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A thermal safety protection device for a soft-pack battery cell, characterized in that: include: Battery cell assembly and housing assembly; A receiving cavity for receiving the battery cell assembly is formed in the shell assembly, and heat dissipation gaps are provided above both sides of the shell assembly, and the heat dissipation gaps are sealed by spraying glue; The upper surface of the battery cell assembly is provided with an upper structural glue (1), and the lower surface of the battery cell assembly is provided with a lower structural glue (2). The battery cell assembly comprises a plurality of soft-pack battery cells (3), and the plurality of soft-pack battery cells (3) are stacked in the thickness direction thereof, and every two soft-pack battery cells (3) form a battery cell group. A heat insulation plate (4) is provided between adjacent battery cell groups, and the heat dissipation notch is located on the side of the soft-pack battery cell (3). The ends of the plurality of soft-pack battery cells (3) provided with pole ears are jointly encapsulated with pole ear glue (5).

2. A soft-pack battery core thermal safety protection device as claimed in claim 1, characterized in that: The upper structural adhesive (1) comprises three long strips of structural adhesive arranged at intervals, and the long strips of structural adhesive are arranged perpendicular to the soft-package battery core (3).

3. A soft-pack battery core thermal safety protection device as claimed in claim 1, characterized in that: The heat insulation board (4) comprises a foam layer (6) and two mica sheets (7), wherein the two mica sheets (7) are respectively located on both sides of the foam layer (6), and a double-sided adhesive layer (8) is provided between the mica sheet (7) and the foam layer (6).

4. A soft-pack battery core thermal safety protection device as claimed in claim 1, characterized in that: The housing assembly comprises an upper box cover (91) and a lower box body (92) with an upper opening.

5. A thermal safety protection device for a soft-pack battery cell according to claim 1, characterized in that: The inner wall of the shell assembly is provided with a fireproof coating.

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