Soft package battery cell structure

Abstract

The utility model discloses a soft package battery cell structure, which comprises a U-shaped aluminum plate and at least one battery cell accommodated in the U-shaped aluminum plate, the bottom of the U-shaped aluminum plate is provided with an exhaust hole, the U-shaped aluminum plate and the battery cell are fixed in an adhesive mode and form a battery cell module, the battery cell module is a thermal runaway unit, and the thermal runaway unit is connected with the U-shaped aluminum plate. The thermal runaway units are used for controlling internal thermal runaway, the bottoms of the thermal runaway units are provided with water cooling plate binding faces, the water cooling plate binding faces are attached to water cooling plates, the arrangement positions of the water cooling plates correspond to the forming positions of the exhaust holes, and a heat insulation part is arranged between every two adjacent thermal runaway units in a clamped mode. According to the soft package battery cell structure disclosed by the utility model, thermal runaway in a single thermal runaway unit can be realized after thermal runaway of the battery cell, and diffusion is avoided; on the other hand, exhaust of the thermal runaway battery cell is exhausted through the directional exhaust holes, and disordered eruption is avoided; and on the other hand, the thermal runaway battery cell can be rapidly cooled, and the thermal runaway of the surrounding battery cells is inhibited.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal safety of lithium-ion power batteries for new energy electric vehicles, and in particular to a soft-pack battery core structure. Background Art

[0002] At present, the exhaust of soft-pack batteries after thermal runaway is not fixed, and it is randomly sprayed from the pole ear and the side sealing edge of the battery. In the case of such random exhaust, thermal safety protection is very difficult, and the solution is complex and costly.

[0003] Specifically, the current soft-pack thermal runaway exhaust port is not fixed. After thermal runaway, the high-temperature airflow will find a weak point and break through the aluminum-plastic film to exhaust the air. However, since the exhaust port is located randomly, thermal protection is difficult to design, the probability of heat diffusion is greater, and the risk of fire and explosion is higher. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a soft-pack battery core structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a soft-pack battery cell structure, comprising a U-shaped aluminum plate and a battery cell accommodated in the U-shaped aluminum plate, the number of the battery cell is at least one, an exhaust hole is opened at the bottom of the U-shaped aluminum plate, the U-shaped aluminum plate and the battery cell are fixed by gluing to form a battery cell module, the battery cell module is a thermal runaway unit, the thermal runaway unit is used to control internal thermal runaway, the bottom of the thermal runaway unit has a water-cooled plate bonding surface, the water-cooled plate bonding surface is bonded to the water-cooled plate, the setting position of the water-cooled plate corresponds to the opening position of the exhaust hole, and a heat insulating member is sandwiched between two adjacent thermal runaway units.

[0007] Furthermore, the thermal insulation element is a nano-scale thermal insulation material.

[0008] Furthermore, a fireproof part is provided on the exhaust hole.

[0009] Furthermore, the fireproof component is a thin film fireproof material.

[0010] In summary, the beneficial effects of the utility model are:

[0011] The soft-pack battery cell structure of the utility model, on the one hand, after the soft-pack battery cell thermal runaway, the coated "U"-shaped aluminum plate material is used to conduct heat to the bottom water-cooling plate bonding surface to quickly reduce the target battery cell temperature. In addition, after the soft-pack battery cell thermal runaway, the heat insulation material can be used to isolate the high-temperature conduction; on the other hand, the thermal runaway exhaust of the soft-pack battery cell is directionally exhausted through the bottom opening of the coated "U"-shaped aluminum plate; on the other hand, the high-voltage side and non-exhaust port position of the soft-pack battery cell are sealed with structural adhesive to prevent irregular exhaust due to thermal runaway; finally, a thin film fireproof material is pasted through the directional exhaust port to prevent high-temperature gas and fire flow from burning normal batteries.

[0012] The soft-pack battery cell structure of the utility model can, on the one hand, prevent thermal runaway within a single thermal runaway unit after thermal runaway of the battery cell, and on the other hand, exhaust gas from the thermal runaway battery cell is exhausted through directional exhaust holes without disorderly eruption, and on yet another hand, the thermal runaway battery cell can be quickly cooled, and thermal runaway of surrounding battery cells is suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of a soft-pack battery cell structure according to one embodiment;

[0014] Figure 2 for Figure 1 A schematic diagram of the structure of a cell module of a soft-pack cell structure shown;

[0015] Figure 3 for Figure 1 Schematic diagram of the matching relationship between the battery cell and the U-shaped aluminum plate.

[0016] Attached photos

[0017] Battery core 1, U-shaped aluminum plate 2, exhaust hole 21, fireproof part 22, thermal runaway unit 3, heat insulation part 4, water cooling plate bonding surface 5, water cooling plate 6. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of 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.

[0019] See also Figure 1-Figure 3The utility model provides a soft-pack battery cell structure, comprising a U-shaped aluminum plate 2 and a battery cell 1 accommodated in the U-shaped aluminum plate, the number of the battery cell is at least 1, an exhaust hole 21 is opened at the bottom of the U-shaped aluminum plate, the U-shaped aluminum plate and the battery cell are fixed by gluing to form a battery cell module, the battery cell module is a thermal runaway unit 3, the thermal runaway unit is used to control internal thermal runaway, the bottom of the thermal runaway unit has a water-cooled plate bonding surface 5, the water-cooled plate bonding surface is bonded to a water-cooled plate 6, the setting position of the water-cooled plate corresponds to the opening position of the exhaust hole, and a heat insulating member 4 is sandwiched between two adjacent thermal runaway units.

[0020] In one embodiment, the thermal insulation element is a nanoscale thermal insulation material.

[0021] In one embodiment, a fireproof member 22 is provided on the exhaust hole.

[0022] In one embodiment, the fireproofing element is a thin film fireproofing material.

[0023] The soft-pack battery cell structure of the utility model, the U-shaped aluminum plate can form a single battery cell or multiple battery cells into a battery cell module, and the unit is a thermal runaway unit, which controls the thermal runaway in the unit and does not spread to the next unit; the "U"-shaped aluminum plate quickly cools the thermal runaway battery cell by heat conduction cooling of multiple surfaces of the battery cell, thereby reducing the risk of heat diffusion; nano-scale thermal insulation materials are used for strong thermal insulation between two adjacent thermal runaway units to ensure that the heat transferred during the thermal runaway process is within a safe range, and to ensure that the thermal runaway unit next door does not have thermal runaway due to heat conduction; directional exhaust holes are designed at the bottom of the U-shaped aluminum plate to guide the high-temperature gas and fire flow of the thermal runaway battery cell to be discharged from the exhaust holes, avoiding high-voltage devices, and avoiding insulation, short circuit, arcing and other risks; thin film fireproof materials are used at the exhaust hole position to block the high-temperature gas and fire flow discharged from the explosion-proof valve of the thermal runaway battery cell from the high-temperature impact on the surrounding battery cells, which can prevent the thermal runaway gas from impacting and roasting the thermal runaway battery cell and causing heat diffusion.

[0024] The soft-pack battery cell structure of the utility model, on the one hand, after the soft-pack battery cell thermal runaway, the coated "U"-shaped aluminum plate material is used to conduct heat to the bottom water-cooling plate bonding surface to quickly reduce the target battery cell temperature. In addition, after the soft-pack battery cell thermal runaway, the heat insulation material can be used to isolate the high-temperature conduction; on the other hand, the thermal runaway exhaust of the soft-pack battery cell is directionally exhausted through the bottom opening of the coated "U"-shaped aluminum plate; on the other hand, the high-voltage side and non-exhaust port position of the soft-pack battery cell are sealed with structural adhesive to prevent irregular exhaust due to thermal runaway; finally, a thin film fireproof material is pasted through the directional exhaust port to prevent high-temperature gas and fire flow from burning normal batteries.

[0025] The soft-pack battery cell structure of the utility model can, on the one hand, prevent thermal runaway within a single thermal runaway unit after thermal runaway of the battery cell, and on the other hand, exhaust gas from the thermal runaway battery cell is exhausted through directional exhaust holes without disorderly eruption, and on yet another hand, the thermal runaway battery cell can be quickly cooled, and thermal runaway of surrounding battery cells is suppressed.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit the protection scope of the utility model. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the utility model.

Claims

1. A soft-pack battery cell structure, characterized in that: It comprises a U-shaped aluminum plate and a battery cell accommodated in the U-shaped aluminum plate, the number of the battery cell is at least 1, an exhaust hole is opened at the bottom of the U-shaped aluminum plate, the U-shaped aluminum plate and the battery cell are fixed by gluing to form a battery cell module, the battery cell module is a thermal runaway unit, the thermal runaway unit is used to control internal thermal runaway, the bottom of the thermal runaway unit has a water-cooled plate bonding surface, the water-cooled plate bonding surface is bonded to the water-cooled plate, the setting position of the water-cooled plate corresponds to the opening position of the exhaust hole, and a heat insulating member is sandwiched between two adjacent thermal runaway units.

2. The soft-pack battery cell structure according to claim 1, characterized in that: The thermal insulation member is a nano-scale thermal insulation material.

3. The soft-pack battery cell structure according to claim 2, characterized in that: The exhaust hole is provided with a fireproof part.

4. The soft-pack battery cell structure according to claim 3, characterized in that: The fireproofing element is a thin film fireproofing material.

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