Heat insulation cushion, battery module and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a heat insulation cushion, a battery module and a battery pack. The heat insulation cushion pad is provided with the two heat insulation plates and the multiple buffer strips, the two heat insulation plates are oppositely arranged, the buffer strips are arranged between the two heat insulation plates, the multiple buffer strips are arranged at equal intervals in the first direction, and in the first direction, the buffer strips are arranged at equal intervals. In the first direction, the side walls of the opposite sides of the two buffering strips located on the outermost side in the multiple buffering strips are flush with the side wall of the corresponding side of the heat insulation plate, and in the second direction, the side walls of the two opposite sides of each buffering strip are flush with the side wall of the corresponding side of the heat insulation plate. After being clamped between two adjacent battery cells in the battery module, the heat insulation buffer cushion has good heat insulation and buffer effects. Moreover, compared with a sheet-shaped buffer sheet, the heat insulation buffer pad adopts a plurality of buffer strips which are arranged at intervals, so that the weight of the heat insulation buffer pad is correspondingly reduced, and the effect of improving the energy density of the battery module is further achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a heat-insulating buffer pad, a battery module and a battery pack. Background Art

[0002] The battery cell is the smallest unit of a power battery and also serves as the energy storage unit. It must have a high energy density to store as much energy as possible, giving electric vehicles a longer range. Furthermore, the lifespan of the battery cell is also a critical factor. Damage to any single cell will damage the entire battery pack.

[0003] As battery cells undergo increasing charge and discharge cycles, they expand slightly compared to their initial stage. This expansion becomes more pronounced after 3-5 years of use. Furthermore, the factory manufacturing process introduces dimensional tolerances within the cells. These dimensional variations can alter the shape of the battery pack, reducing the battery's lifespan.

[0004] Current battery modules typically incorporate buffer sheets to isolate battery cells. These sheets are compressed to absorb cell expansion and are typically sandwiched between the larger surfaces of the cells. However, since modules often require multiple thermal insulation pads between cells to prevent thermal diffusion, the addition of these pads increases the weight of the module, further increasing the weight of the battery, reducing its energy density and hindering daily use.

[0005] Therefore, there is an urgent need to provide a thermal insulation buffer pad, a battery module and a battery pack to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a heat-insulating buffer pad, which can achieve the effect of improving the energy density of the battery while meeting the heat-insulating buffer effect.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] A heat-insulating cushion comprising:

[0009] There are two heat insulation boards, which are spaced apart from each other.

[0010] A buffer bar is placed between two insulation boards. There are multiple buffer bars, and the multiple buffer bars are arranged at intervals along a first direction. In the first direction, the side walls of the two outermost buffer bars among the multiple buffer bars are respectively flush with the side walls of the insulation boards corresponding to the side walls. In the second direction, the opposite side walls of each buffer bar are respectively flush with the side walls of the insulation boards corresponding to the side walls. One of the first direction and the second direction is the length direction of the insulation board, and the other is the width direction of the insulation board.

[0011] Preferably, an air accommodating space is formed between two adjacent buffer strips.

[0012] Preferably, the heat insulation board is bonded and fixed to the buffer strip.

[0013] Preferably, the heat insulation board and the buffer strip are bonded and fixed by double-sided tape and / or adhesive.

[0014] Preferably, the buffer strip is a foam element.

[0015] Preferably, the thermal insulation board is a mica board.

[0016] Preferably, the thickness of the heat insulation board ranges from 0.15 mm to 2.5 mm, and / or the thickness of the buffer strip ranges from 0.45 mm to 5.5 mm.

[0017] Another object of the present invention is to provide a battery module with higher energy density.

[0018] To achieve this purpose, the present invention adopts the following technical solutions:

[0019] A battery module includes a battery cell and the above-mentioned thermal insulation buffer pad. There are multiple battery cells, which are arranged in sequence along a third direction, which is the thickness direction of the insulation board. A thermal insulation buffer pad is sandwiched between every two adjacent battery cells.

[0020] Preferably, the thermal insulation buffer pad is bonded to the battery cell; and / or, two adjacent battery cells cooperate to clamp the thermal insulation buffer pad.

[0021] Another object of the present invention is to provide a battery pack with higher energy density.

[0022] To achieve this purpose, the present invention adopts the following technical solutions:

[0023] A battery pack comprises a shell and the above-mentioned battery module, wherein the battery module is placed in the shell.

[0024] Beneficial effects of the utility model:

[0025] The thermal insulation buffer pad of the present invention is provided with two thermal insulation plates and a plurality of buffer strips. The thermal insulation plates are arranged relative to each other, and the buffer strips are placed between the two thermal insulation plates. The plurality of buffer strips are arranged at equal intervals along the first direction. In the first direction, the side walls of the two outermost buffer strips among the plurality of buffer strips are respectively flush with the side walls of the corresponding side of the thermal insulation plate. In the second direction, the side walls of each buffer strip are respectively flush with the side walls of the corresponding side of the thermal insulation plate. After the thermal insulation buffer pad is clamped between two adjacent battery cells in the battery module, firstly, the two thermal insulation plates are arranged relative to each other. On the one hand, the thermal insulation plates can provide stable support for the battery cells on both sides thereof, and on the other hand, the thermal insulation plates have a heat insulation effect. Secondly, the buffer strips are placed between the two thermal insulation plates, and the plurality of buffer strips are arranged at intervals. Compared with the sheet-like buffer sheet, the thermal insulation buffer pad adopts a plurality of buffer strips arranged at intervals, so that the weight of the thermal insulation buffer pad is reduced accordingly, thereby achieving the effect of reducing the weight of the battery module. Again, when the two insulation boards move relative to each other, the buffer strips have a good buffering effect, and in the first direction, the side walls of the two outermost buffer strips facing each other are flush with the side walls corresponding to the insulation boards. In the second direction, the side walls on both sides of each buffer strip are flush with the side walls corresponding to the insulation boards, so that the insulation buffer pad has a good buffering effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the heat-insulating cushion provided by the present invention;

[0027] Figure 2 This is a schematic diagram of the explosion structure of the heat-insulating cushion provided by the utility model;

[0028] Figure 3 It is a top view of the thermal insulation cushion provided by the utility model.

[0029] In the picture:

[0030] 1. Heat insulation board; 2. Buffer strip. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0032] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0033] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0035] This embodiment provides a thermal insulation cushion, which can achieve the effect of improving the energy density of the battery while satisfying the thermal insulation cushioning effect.

[0036] Specifically, if Figures 1 to 3 As shown, the thermal insulation cushion is provided with two thermal insulation boards 1 and a plurality of buffer bars 2, the two thermal insulation boards 1 are arranged at intervals relative to each other, the buffer bars 2 are placed between the two thermal insulation boards 1, and the plurality of buffer bars 2 are arranged at equal intervals along the first direction. Figure 1 In the X direction shown in FIG, the side walls of the two outermost buffer bars 2 of the plurality of buffer bars 2 facing each other are flush with the side walls of the insulation board 1 corresponding to the side walls thereof. Figure 1 The Y direction shown in the figure), the two opposite side walls of each buffer bar 2 are flush with the corresponding side wall of the insulation board 1, and one of the first direction and the second direction is the length direction of the insulation board 1, and the other is the width direction of the insulation board 1.

[0037] After the thermal insulation buffer pad is sandwiched between two adjacent battery cells in the battery module, first, the two thermal insulation boards 1 are arranged relative to each other. On the one hand, the thermal insulation boards 1 can provide stable support for the battery cells on both sides, and on the other hand, the thermal insulation boards 1 have a heat insulation effect. Secondly, the buffer strips 2 are placed between the two thermal insulation boards 1, and multiple buffer strips 2 are arranged at intervals. Compared with sheet-like buffer sheets, the thermal insulation buffer pad uses multiple buffer strips 2 arranged at intervals, so that the weight of the thermal insulation buffer pad is reduced accordingly, thereby achieving the effect of reducing the weight of the battery module. Thirdly, when the two thermal insulation boards 1 move relative to each other, the buffer strips 2 have a good buffering effect. In addition, in the first direction, the side walls of the two outermost buffer strips 2 facing each other are respectively flush with the side walls of the corresponding side of the thermal insulation board 1. In the second direction, the two opposite side walls of each buffer strip 2 are respectively flush with the side walls of the corresponding side of the thermal insulation board 1, so that the thermal insulation buffer pad has a good buffering effect, and thus the thermal insulation buffer pad can effectively absorb the expansion and dimensional tolerance of the battery cell, thereby achieving the effect of extending the service life of the battery.

[0038] In this embodiment, the number of buffer bars 2 is 3. In other embodiments, the number of buffer bars 2 is 4, 5 or 6, etc. The specific number and volume of the buffer bars 2 can be adjusted according to the preload force of the battery pack and the size of the battery cell area, and will not be listed here one by one.

[0039] Furthermore, air is filled between two adjacent buffer bars 2. On the one hand, because air has the lowest thermal conductivity in nature, the thermal insulation cushion has a good thermal insulation effect. On the other hand, it also avoids adding other materials between the two buffer bars 2 to affect the cushioning effect of the thermal insulation cushion. On the other hand, the air filled between the two adjacent buffer bars 2 increases the air volume and avoids direct contact between the two adjacent buffer bars 2, making the thermal insulation cushion have a very low thermal conductivity and improving the thermal insulation performance of the thermal insulation cushion.

[0040] Optionally, the heat insulation board 1 and the buffer strip 2 are bonded and fixed to achieve fixation of the heat insulation board 1 and the buffer strip 2, making the buffering performance of the heat insulation buffer pad more stable.

[0041] Furthermore, the insulation board 1 and buffer strip 2 are bonded and fixed using double-sided tape, making the connection between the insulation board 1 and buffer strip 2 more stable. The double-sided tape has a thickness range of only 0.01mm-0.05mm, which does not affect the overall thickness of the insulation cushion. Furthermore, the double-sided tape itself has high high-temperature resistance, making it less likely to deform during the charge and discharge of the battery cell, thereby further enhancing the bonding stability between the insulation board 1 and buffer strip 2. In other embodiments, the insulation board 1 and buffer strip 2 can also be bonded using adhesive.

[0042] Optionally, the buffer strip 2 is a foam element, which gives the buffer strip 2 itself excellent compression rebound properties. This allows the buffer strip 2 to absorb the dimensional changes of the battery cell during the charge and discharge process, providing stable support for the battery cell and extending the battery life. At the same time, the buffer strip 2 can absorb the dimensional tolerance of the battery cell itself, thereby ensuring that the size of the battery module remains unchanged, thereby improving the dimensional stability of the battery pack. In this embodiment, the material of the buffer strip 2 is silicone foam. In other embodiments, the material of the buffer strip 2 can also be silicone rubber, PU foam, melamine foam, MPP (microporous expanded polypropylene), EPP (polypropylene plastic foam material), or CR foam, etc.

[0043] Optionally, the thermal insulation board 1 is a mica board, so that the thermal insulation buffer pad has a good thermal insulation effect. The mica board has excellent fire resistance and can still maintain structural integrity at high temperatures. The mica board can also resist flame erosion of at least 1300 degrees Celsius, preventing the spread of flames to other areas and eliminating the occurrence of heat convection, so that the thermal insulation buffer pad has excellent thermal insulation performance. In addition, the mica sheet itself has high stiffness, which facilitates the processing of the thermal insulation board 1 and the installation between the thermal insulation buffer pad and the battery cell. Since the thermal insulation buffer pad can still maintain structural integrity at high temperatures and has excellent electrical insulation, after the battery pack thermal runaway, the battery cell will spray high-temperature molten material, which can easily cause the battery pack to short-circuit and cause high-temperature arcing. Placing the thermal insulation buffer pad between the battery cells can avoid the occurrence of serious fire accidents caused by battery pack short-circuit arcing, thereby improving the safety of the battery pack.

[0044] Optionally, the thickness of the thermal insulation board 1 ranges from 0.15mm to 2.5mm. This allows the thermal insulation cushion to provide insulation while further reducing the space occupied by the cushion, thereby achieving a lightweight battery module. In this embodiment, the thickness of the thermal insulation board 1 is 0.2mm. In other implementations, thermal insulation boards of different thicknesses, such as 0.15mm, 1.5mm, or 2.5mm, can be selected based on the thickness and area of the battery cells.

[0045] Optionally, the thickness of the buffer strip 2 ranges from 0.45mm to 5.5mm, allowing the thermal insulation cushion to provide a cushioning effect while further reducing the space occupied by the cushion. In this embodiment, the cushion thickness is 0.5mm. In other implementations, buffer strips 2 of varying thicknesses can be selected based on the thickness of the battery cell to meet the lightweight requirements of the battery module, such as 0.45mm, 3.0mm, or 5.5mm.

[0046] This embodiment also provides a battery module having a high energy density.

[0047] Specifically, the battery module includes a battery cell and the above-mentioned thermal insulation buffer pad, wherein the number of the battery cells is multiple, and the multiple battery cells are arranged along the third direction (such as Figure 1 The battery cells are arranged in the Z direction (as shown), and the third direction is the thickness direction of the thermal insulation board 1. A thermal insulation cushioning pad is sandwiched between each two adjacent battery cells. This battery module uses the thermal insulation cushioning pad, which is lightweight and has good insulation and cushioning effects, thereby improving the dimensional stability and energy density of the battery module.

[0048] In this embodiment, the number of battery cells is 3. In other embodiments, the number of battery cells may be 4, 5, or 6.

[0049] Optionally, the thermal insulation cushions and the battery cells are arranged alternately. In this embodiment, the two opposite outer sides of the battery module are both battery cells. In other embodiments, the two opposite outer sides of the battery module may be thermal insulation cushions and battery cells respectively, or both opposite outer sides of the battery module may be thermal insulation cushions.

[0050] Furthermore, the thermal insulation cushion is bonded to the battery cell, achieving a stable connection between the thermal insulation cushion and the battery cell, thereby ensuring the stability of the thermal insulation cushion's ability to absorb the battery cell's dimensional tolerances. In another embodiment, two adjacent battery cells can cooperate to clamp the thermal insulation cushion to achieve a stable connection between the thermal insulation cushion and the battery cell. In yet another embodiment, two adjacent battery cells cooperate to clamp the thermal insulation cushion and are bonded to the corresponding side surface of the thermal insulation cushion.

[0051] This embodiment also provides a battery pack with high energy density.

[0052] Specifically, the battery pack includes a housing and the aforementioned battery module, wherein the battery module is placed within the housing to secure the battery module. The battery pack utilizes the aforementioned battery module, which has high dimensional stability and energy density, resulting in the battery pack having good dimensional stability and high energy density. Furthermore, the thermal insulation cushion absorbs the expansion of the battery cells during charging and discharging, thereby extending the battery's service life. In this embodiment, the number of battery modules is one; in other embodiments, the number of battery modules may be two, three, or four groups, for example.

[0053] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A thermal insulation cushion, characterized in that: The thermal insulation cushion comprises: A heat insulation board (1), wherein the number of the heat insulation boards (1) is two, and the two heat insulation boards (1) are arranged relative to each other and spaced apart; A buffer bar (2), the buffer bar (2) is placed between the two heat insulation boards (1), the number of the buffer bars (2) is multiple, and the multiple buffer bars (2) are spaced apart along a first direction. In the first direction, the side walls of the two outermost buffer bars (2) among the multiple buffer bars (2) facing each other are respectively flush with the side walls of the corresponding side of the heat insulation board (1); in the second direction, the two opposite side walls of each buffer bar (2) are respectively flush with the side walls of the corresponding side of the heat insulation board (1); one of the first direction and the second direction is the length direction of the heat insulation board (1), and the other is the width direction of the heat insulation board (1).

2. The thermal insulation cushion according to claim 1, characterized in that: An air accommodating space is formed between two adjacent buffer strips (2).

3. The thermal insulation cushion according to claim 1, characterized in that: The heat insulation board (1) is bonded and fixed to the buffer strip (2).

4. The thermal insulation cushion according to claim 3, characterized in that: The heat insulation board (1) and the buffer strip (2) are bonded and fixed by double-sided tape and / or adhesive.

5. The thermal insulation cushion according to any one of claims 1 to 4, characterized in that: The buffer strip (2) is a foaming element.

6. The thermal insulation cushion according to any one of claims 1 to 4, characterized in that: The heat insulation board (1) is a mica board.

7. The thermal insulation cushion according to any one of claims 1 to 4, characterized in that: The thickness of the heat insulation board (1) ranges from 0.15 mm to 2.5 mm, and / or the thickness of the buffer strip (2) ranges from 0.45 mm to 5.5 mm.

8. A battery module, characterized in that: include: A battery cell and a thermal insulation buffer pad as described in any one of claims 1 to 7, wherein the number of the battery cells is multiple, the multiple battery cells are arranged in sequence along a third direction, the third direction is the thickness direction of the thermal insulation board (1), and the thermal insulation buffer pad is sandwiched between every two adjacent battery cells.

9. The battery module according to claim 8, characterized in that: The thermal insulation buffer pad is bonded to the battery core; and / or two adjacent battery cores cooperate to clamp the thermal insulation buffer pad.

10. A battery pack, characterized in that: The invention comprises a housing and the battery module according to claim 8 or 9, wherein the battery module is placed in the housing.

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