Battery module structure with function of inhibiting thermal runaway of battery

Abstract

The battery module structure with the function of inhibiting the thermal runaway of the battery comprises an isolation plate integrated module, battery cells and mica sheets, the battery cells are arranged side by side in the front-back direction, first heat insulation cotton is uniformly arranged in the front-back contact area of each battery cell, and a second heat insulation cotton is uniformly arranged in the front-back contact area of each battery cell. Second heat insulation cotton is placed in the contact area of the two columns of battery cells adjacent left and right, a first insulation sheet and a second insulation sheet are placed at the front end and the rear end of the assembled battery cells respectively, a first end plate is fixed to the front tail end of the first insulation sheet through structural adhesive, and a second end plate is fixed to the rear tail end of the second insulation sheet through structural adhesive; a second side plate and a first side plate are respectively fixed on the left side and the right side of the assembled battery cell through structural adhesive, a third insulation sheet is fixed at the bottom of the assembled battery cell through structural adhesive, and the isolation plate integration module is placed at the top of the assembled battery cell. Diffusion of thermal runaway is limited by adopting an isolation barrier and a barrier material, light weight is achieved, and the effects of thermal isolation and thermal protection are achieved.

Description

Technical field:

[0001] The utility model relates to a battery module structure with a function of suppressing battery thermal runaway, and belongs to the field of power battery systems. Background technology:

[0002] In the field of new energy power batteries, factors such as overcharging, over-discharging, short circuit, external heat source, and mechanical damage may cause the chemical reaction in the battery to get out of control, which in turn leads to heat accumulation and temperature rise, and ultimately thermal runaway of the power battery. The high temperature caused by thermal runaway may ignite the combustible materials inside the battery, causing fire and explosion, posing a serious threat to personnel, property, and the environment.

[0003] Therefore, it is necessary to improve the existing technology to solve the shortcomings of the existing technology. Utility model content:

[0004] The utility model aims to solve the problems existing in the above-mentioned prior art and provides a battery module structure with the function of suppressing battery thermal runaway. It adopts isolation barriers and barrier materials to limit the spread of thermal runaway, which can not only achieve the purpose of lightweight but also play the role of thermal isolation and thermal protection.

[0005] The technical solutions adopted by the utility model include: a battery module structure with a function of suppressing battery thermal runaway, comprising an isolation plate integrated module, battery cells and mica sheets, the battery cells are placed side by side in the front-to-back direction, a first thermal insulation cotton is evenly placed in the front and rear contact areas of each battery cell, a second thermal insulation cotton is placed in the contact areas of two adjacent columns of battery cells on the left and right, a first insulating sheet and a second insulating sheet are respectively placed at the front and rear ends of the assembled battery cell, a first end plate is fixed to the front end of the first insulating sheet by structural adhesive, a second end plate is fixed to the rear end of the second insulating sheet by structural adhesive, a second side plate and a first side plate are respectively fixed to the left and right sides of the assembled battery cell by structural adhesive, a third insulating sheet is fixed to the bottom of the assembled battery cell by structural adhesive, the isolation plate integrated module is placed on the top of the assembled battery cell, and the mica sheet is installed and fixed on the top of the isolation plate integrated module.

[0006] Furthermore, the isolation plate integrated module is composed of an isolation plate and a plurality of aluminum bars, and a third avoidance hole is provided on the isolation plate integrated module.

[0007] Furthermore, the positions of the two third avoidance holes adjacent to each other on the isolation plate are recessed downward as a whole to form a first installation groove, and the aluminum bar is placed in the first installation groove.

[0008] Furthermore, two spaced-apart first limiting columns are provided on one side edge of each first mounting groove, and an aluminum bar mounting hole is provided on the aluminum bar at a position opposite to the first limiting columns, and the first limiting column passes through the aluminum bar mounting hole.

[0009] Furthermore, nylon rivet mounting posts are provided on both sides of the isolation plate, and a first avoidance hole is formed on the mica sheet at a position opposite to the nylon rivet mounting post. After the nylon rivet passes through the first avoidance hole on the mica sheet, it is fixed to the nylon rivet mounting post.

[0010] Furthermore, a fourth avoidance hole is provided in the middle area of ​​each of the left and right adjacent aluminum bars, and a second avoidance hole is formed on the mica sheet at a position corresponding to the fourth avoidance hole.

[0011] Furthermore, the first thermal insulation wool consists of a circular frame and aerogel.

[0012] Furthermore, end plate mounting holes are evenly distributed on the tops of the first end plate and the second end plate.

[0013] Furthermore, a plurality of end plate weight-reducing holes are provided on the first end plate and the second end plate.

[0014] Furthermore, end plate hoisting holes are provided on the first end plate and the second end plate.

[0015] The utility model has the following beneficial effects:

[0016] (1) Lightweight and high-strength structure: The end plates and side plates are made of aluminum alloy 6061-T6, and the welding is done by laser penetrating drill to ensure the welding strength.

[0017] (2) Low cost: The design of integrating three rows of modules into one large module reduces the use of parts and improves space utilization. The production process is simple and labor costs are reduced. The end panels, side panels, and isolation panels are molded and can be produced in large quantities, which greatly reduces costs. Description of the drawings:

[0018] Figure 1 It is a schematic diagram of the decomposition structure of the battery module with the function of suppressing battery thermal runaway of the utility model.

[0019] Figure 2 It is a schematic diagram of the first end plate or the second end plate.

[0020] Figure 3 Schematic diagram of the first thermal insulation cotton.

[0021] Figure 4 Schematic diagram of mica sheet.

[0022] Figure 5 Schematic diagram of the isolation plate and aluminum bar.

[0023] Figure 6 for Figure 5 A is an enlarged schematic diagram.

[0024] Figure 7 It is a schematic diagram of the assembly structure of a battery module with the function of suppressing battery thermal runaway according to the utility model. Specific implementation method:

[0025] The utility model is further described below in conjunction with the accompanying drawings.

[0026] The utility model discloses a battery module structure with a function of suppressing thermal runaway of a battery, comprising an isolation plate integrated module 1, a battery core 3 and a mica sheet 13.

[0027] In the battery module structure with the function of suppressing battery thermal runaway of the utility model, the cells 3 are placed side by side in the front-to-back direction, and the first thermal insulation cotton 6 is evenly placed in the area where each cell contacts the other cell. In addition, the second thermal insulation cotton 7 is placed in the area where the two adjacent columns of cells contact each other, so that each cell is protected by the thermal insulation cotton. When a cell has thermal runaway, because of the presence of the thermal insulation cotton, there will be no mutual influence, and the heat will not be transferred to other cells.

[0028] A first insulating sheet 4 and a second insulating sheet 10 are placed at the front and rear ends of the assembled battery cell, respectively; a first end plate 5 is fixed to the front end of the first insulating sheet 4 by structural adhesive, and a second end plate 11 is fixed to the rear end of the second insulating sheet 10 by structural adhesive.

[0029] The second side panel 9 and the first side panel 2 are fixed to the left and right sides of the assembled battery cell by structural adhesive respectively. Both ends of the first side panel 2 and the second side panel 9 are folded inward to form flange edges, which are used to be welded to the side panel welding surface 17.

[0030] A third insulating sheet 8 is fixed to the bottom of the assembled battery cell by means of structural adhesive, and the third insulating sheet 8 plays an insulating and protective role for the bottom installation of the battery module.

[0031] In the utility model, the isolation plate integrated module 1 is placed on the top of the assembled battery cell 3, and the isolation plate integrated module 1 is composed of an isolation plate 28 and a plurality of aluminum bars 27. A third avoidance hole 23 is provided on the isolation plate integrated module 1, and the third avoidance hole 23 is used to avoid the positive and negative poles on the top of the battery cell 3, so as to facilitate the welding of the aluminum bar 27 and the battery cell pole.

[0032] The positions of two adjacent third avoidance holes 23 on the isolation plate 28 are recessed downward as a whole to form a first installation groove 29, and the first installation groove 29 is used to place the aluminum bar 27 to play a role of limiting.

[0033] Two spaced-apart first limiting columns 24 are provided on one side edge of each first mounting groove 29, and an aluminum bar mounting hole 26 is provided on the aluminum bar 27 at a position opposite to the first limiting columns 24. The first limiting columns 24 pass through the aluminum bar mounting hole 26 to play an anti-mistake and positioning role, facilitate the installation of the aluminum bar, and avoid the aluminum bar being installed incorrectly or upside down.

[0034] Nylon rivet mounting columns 22 are provided on both sides of the isolation plate 28, and a first avoidance hole 20 is formed on the mica sheet 13 at a position opposite to the nylon rivet mounting columns 22. After the nylon rivet 12 passes through the first avoidance hole 20 on the mica sheet 13, it is fixed to the nylon rivet mounting columns 22, thereby installing and fixing the mica sheet 13 on the top of the isolation plate integrated module 1.

[0035] A fourth avoidance hole 25 is provided in the middle area of ​​each of the left and right adjacent aluminum bars 27 , and a second avoidance hole 21 is formed at a position on the mica sheet 13 corresponding to the fourth avoidance hole 25 .

[0036] When the battery cell has thermal runaway, the electrolyte and other combustibles inside the battery cell are ejected outward through the second avoidance hole 21 and the fourth avoidance hole 25. At the same time, the ejected electrolyte and other combustibles are blocked by the mica sheet 13 to prevent other combustibles from causing thermal runaway to the normal battery cell. The mica sheet has the functions of fire prevention, high temperature resistance and impact resistance, and plays a thermal barrier role in thermal runaway of the battery cell. The high-temperature smoke ejected from the battery cell in thermal runaway is kept as far away from the damaged area as possible, so that the high-temperature combustible gas and heat can be isolated as soon as possible.

[0037] In the present invention, the first heat insulation cotton 6 is composed of a circular frame 18 and an aerogel 19. The circular frame 18 is made of silicone material and has a certain elasticity. It can effectively buffer the expansion force of the battery cell when the battery cell expands. The aerogel 19 has high temperature resistance, low thermal conductivity, extremely high heat insulation battery pack and fireproof ability, and low density and light weight. It is widely used in thermal protection. The second heat insulation cotton 7 is also made of aerogel.

[0038] In the utility model, the first end plate 5 and the second end plate 11 are both made of high-strength aluminum alloy 6061-T6, which are light in weight and high in strength. End plate mounting holes 14 are evenly distributed on the top of the first end plate 5 and the second end plate 11, which play the role of installing and fixing the module. In order to reduce weight, a number of regular end plate weight reduction holes 16 are provided on the first end plate 5 and the second end plate 11. At the same time, end plate hoisting holes 15 are provided on the first end plate 5 and the second end plate 11 for hoisting the module. Side plate welding surfaces 17 are provided on both sides of the first end plate 5 and the second end plate 11 for welding with the first side plate 2 and the second side plate 9 on both sides to make the module a whole.

[0039] The battery module of the utility model is a multi-row large module structure, which can improve space utilization, reduce the use of parts and components, and has the effect of lightweighting compared to a single-row small module.

[0040] In the design of the utility model, the bottom of the battery cell is coated with a thermally conductive structural adhesive, which is fixed to the battery pack. It can resist the impact of the box module under harsh working conditions. Because it has a thermal conductive effect, it can also conduct part of the heat of the battery cell out of the box.

[0041] In the utility model, the first thermal insulation cotton and the second thermal insulation cotton are aerogels with a thermal conductivity of about 0.02W / mK, which can play a role in thermal isolation and block the spread of heat when thermal runaway occurs in the battery core.

[0042] The material of the isolation plate in the utility model is PA66+30% GF, which has good stability, high mechanical strength, heat resistance, antistatic, and can meet the use requirements of the module electrical insulation and withstand voltage.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements without departing from the principle of the present invention, and these improvements should also be regarded as within the protection scope of the present invention.

Claims

1. A battery module structure with a function of suppressing battery thermal runaway, characterized in that: The invention comprises an isolation plate integrated module (1), battery cells (3) and mica sheets (13), wherein the battery cells (3) are arranged side by side in the front-to-back direction, a first heat insulating cotton (6) is evenly placed in the front and rear contact areas of each battery cell, a second heat insulating cotton (7) is placed in the contact areas of two adjacent rows of battery cells on the left and right, a first insulating sheet (4) and a second insulating sheet (10) are respectively placed at the front and rear ends of the assembled battery cells, a first end plate (5) is fixed to the front end of the first insulating sheet (4) by structural adhesive, a second end plate (11) is fixed to the rear end of the second insulating sheet (10) by structural adhesive, a second side plate (9) and a first side plate (2) are respectively fixed to the left and right sides of the assembled battery cells by structural adhesive, a third insulating sheet (8) is fixed to the bottom of the assembled battery cells by structural adhesive, the isolation plate integrated module (1) is placed on the top of the assembled battery cells (3), and the mica sheet (13) is installed and fixed to the top of the isolation plate integrated module (1).

2. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 1, characterized in that: The isolation plate integrated module (1) is composed of an isolation plate (28) and a plurality of aluminum bars (27), and a third avoidance hole (23) is provided on the isolation plate integrated module (1).

3. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 2, characterized in that: The positions of two third avoidance holes (23) adjacent to each other on the isolation plate (28) are integrally recessed downward to form a first installation groove (29), and the aluminum bar (27) is placed in the first installation groove (29).

4. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 3, characterized in that: Two spaced-apart first limiting columns (24) are provided on one side edge of each first mounting groove (29), an aluminum bar mounting hole (26) is provided on the aluminum bar (27) at a position opposite to the first limiting columns (24), and the first limiting column (24) passes through the aluminum bar mounting hole (26).

5. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 4, characterized in that: Nylon rivet mounting columns (22) are provided on both sides of the isolation plate (28), and a first avoidance hole (20) is formed on the mica sheet (13) at a position opposite to the nylon rivet mounting column (22). After the nylon rivet (12) passes through the first avoidance hole (20) on the mica sheet (13), it is fixed to the nylon rivet mounting column (22).

6. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 5, characterized in that: A fourth avoidance hole (25) is provided in the middle area of ​​each of the adjacent aluminum bars (27) on the left and right, and a second avoidance hole (21) is formed on the mica sheet (13) at a position corresponding to the fourth avoidance hole (25).

7. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 6, characterized in that: The first heat insulating cotton (6) is composed of a circular frame (18) and aerogel (19).

8. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 7, characterized in that: End plate mounting holes (14) are evenly distributed on the tops of the first end plate (5) and the second end plate (11).

9. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 8, characterized in that: A plurality of end plate weight-reducing holes (16) are provided on the first end plate (5) and the second end plate (11).

10. The battery module structure with the function of suppressing battery thermal runaway as claimed in claim 9, characterized in that: End plate hoisting holes (15) are provided on the first end plate (5) and the second end plate (11).

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