A separator pad and battery pack

Abstract

The utility model discloses a kind of partition pad and battery pack, battery pack includes: heat insulation layer and heat conducting layer, heat insulation layer is set between two adjacent battery cells, heat conducting layer is attached to battery cell.The present application solves the situation that heat is easily generated between adjacent battery cells in battery pack, thereby affecting the technical problem of battery performance and safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a separator pad and a battery pack. Background Technology

[0002] With the rapid development of electric vehicles and energy storage systems, the importance of lithium-ion batteries as their core components is becoming increasingly prominent. However, due to the high energy density conditions under which batteries are used, thermal runaway has become one of the major factors threatening their safety and reliability. To suppress heat dissipation during thermal runaway and delay the occurrence of accidents, thermal insulation pads are typically installed between the cells. By placing a thermal insulation layer between the cells, heat transfer between them can be effectively slowed down, thereby reducing the probability of thermal runaway events. Currently, commonly used thermal insulation pad materials on the market include aerogel, nanoporous materials, cross-linked polypropylene (XPP), and silicone foam. These materials are widely used in battery thermal management systems due to their excellent thermal insulation performance and lightweight properties.

[0003] However, heat can easily accumulate between adjacent cells in a battery pack, which can affect battery performance and safety. Utility Model Content

[0004] One objective of this invention is to provide a heat insulation pad and a battery pack, which aims to solve the technical problem that heat easily accumulates between adjacent cells in a battery pack, thereby affecting battery performance and safety.

[0005] To achieve the above objectives, the present invention provides a solution: a separator pad, comprising: a heat insulation layer and a heat-conducting layer, wherein the heat insulation layer is disposed between two adjacent battery cells, and the heat-conducting layer is attached to the battery cells.

[0006] Optionally, the thickness of a single thermally conductive layer is D1, and the thickness of the thermal insulation layer is D2, where 0.015≤D1 / D2≤0.0225.

[0007] Optionally, 0.015mm≤D1≤0.05mm.

[0008] Optionally, 1mm≤D2≤2mm.

[0009] Optionally, at least two spacer pads are provided between two adjacent cells, spaced apart along the width or height of the cells, to form a heat insulation channel, with the spacer pads extending along the height of the cells.

[0010] Optionally, the separator pad has multiple notches that extend through the separator pad along its thickness direction.

[0011] Optionally, the projection of the separator pad in the cell thickness direction falls inside the side of the cell.

[0012] Optionally, the distance between the edge of the separator and the edge of the battery cell is D3, where 3mm≤D3≤7mm.

[0013] Optionally, the battery pack also includes thermally conductive adhesive and a liquid cooling plate. The liquid cooling plate is located at one end of the battery pack for heat dissipation. The thermally conductive adhesive is located between the liquid cooling plate and the battery pack. The battery pack is connected to the liquid cooling plate through the thermally conductive adhesive. The thermally conductive adhesive and spacers are spaced apart.

[0014] Optionally, the separator pad is flexible and can deform along the thickness direction of the cell.

[0015] Secondly, this application provides a solution: a battery pack comprising: multiple battery cells and multiple spacers, wherein the multiple battery cells are arranged sequentially to form a battery pack, and the spacers are disposed between two adjacent battery cells.

[0016] The beneficial effects of this utility model are as follows:

[0017] The battery pack includes multiple battery cells and multiple spacers. The battery cells are arranged sequentially along their thickness to form a battery pack, such that the larger side surfaces of adjacent battery cells are positioned opposite each other. Spacers are positioned between adjacent battery cells and include a heat-insulating layer and a heat-conducting layer. The heat-conducting layer is positioned between the heat-insulating layer and the battery cell and is attached to the larger side surface of the adjacent battery cell.

[0018] In practical applications, battery cells are prone to localized overheating during operation, leading to uneven heat distribution, a technical problem affecting battery performance and safety. To address this issue, the separator consists of an insulating layer and a thermally conductive layer. The insulating layer effectively reduces heat transfer between adjacent cells, while the thermally conductive layer distributes heat evenly within each cell, reducing the risk of temperature rise due to heat accumulation. This design results in a more uniform temperature distribution within the cells during operation, thereby improving the cooling efficiency and effectiveness of the liquid cooling system. This thermal management method not only enhances the safety and stability of the battery pack but also extends battery life and performance, making it more suitable for high-performance applications. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional structural diagram provided by an embodiment of the present invention to show the internal structure of the battery pack;

[0021] Figure 2 This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a schematic diagram of the structure of the separator pad provided in this embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the heat insulation channel provided in this embodiment of the utility model;

[0024] Figure 5 This is a cross-sectional structural diagram of the heat insulation channel provided in this embodiment of the utility model;

[0025] Figure 6 This is a schematic diagram of the structure used to illustrate the notch, provided by an embodiment of the present invention;

[0026] Figure 7 This is a cross-sectional structural diagram provided by an embodiment of the present invention for showing the notch.

[0027] Explanation of icon numbers:

[0028] 20. Battery pack; 21. Battery cell;

[0029] 30. Separator; 31. Insulation layer; 32. Thermally conductive layer; 33. Notch;

[0030] 40. Insulated passageway;

[0031] 50. Thermal conductive adhesive;

[0032] 60. Liquid cooling plate;

[0033] 70. The thickness direction of the battery cell;

[0034] 80. The width direction of the battery cell;

[0035] 90. The height direction of the battery cell. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] Please see Figures 1 to 3 As shown, Figure 1 This is a cross-sectional structural diagram provided by an embodiment of the present invention to show the internal structure of the battery pack. Figure 2This is provided by the embodiment of the present utility model. Figure 1 A magnified view of a portion of region A in the middle. Figure 3 This is a schematic diagram of the structure of the separator pad 30 provided in this embodiment of the utility model.

[0038] This utility model provides a battery pack comprising: multiple battery cells 21 and multiple spacers 30. The multiple battery cells 21 are arranged sequentially along the thickness direction 70 of the cells to form a battery pack 20, such that the larger side surfaces of adjacent battery cells 21 are positioned opposite each other. The spacers 30 are disposed between two adjacent battery cells 21.

[0039] Specifically, the separator 30 includes a heat insulation layer 31 and a heat-conducting layer 32. The heat-conducting layer 32 is disposed between the heat insulation layer 31 and the battery cell 21, and is attached to the larger side of the adjacent battery cell 21.

[0040] In practical applications, the battery cell 21 is prone to localized overheating during operation, leading to uneven heat distribution, which is a technical problem affecting battery performance and safety. To solve this problem, the separator 30 consists of a heat insulation layer 31 and a heat-conducting layer 32. The heat insulation layer 31 effectively reduces heat transfer between adjacent battery cells 21, while the heat-conducting layer 32 is responsible for evenly distributing the heat of each individual battery cell 21, reducing the risk of temperature rise due to heat accumulation. This design makes the temperature of the battery cell 21 more uniform during operation, thereby improving the cooling efficiency and effect of the liquid cooling system. Through this thermal management method, not only is the safety and stability of the battery pack improved, but the battery's lifespan and performance are also extended, making it more suitable for high-performance application environments.

[0041] In this embodiment, the heat insulation layer 31 can be phenolic foam, rigid polyurethane foam, alumina, silicon dioxide, rock wool board or glass wool board, etc., and the heat conduction layer 32 can be aluminum plate, copper plate, graphene composite material or natural graphite plate, metal matrix composite material, etc.

[0042] Further, see Figure 2 The thickness of a single thermally conductive layer 32 is D1, and the thickness of the thermal insulation layer 31 is D2, with 0.015≤D1 / D2≤0.0225.

[0043] In practical applications, the optimal thermal management ratio of the thermally conductive layer 32 to the thermal insulation layer 31 is a key technical issue for achieving optimal thermal performance. To address this issue, this invention further specifies that the ratio of the thickness D1 of the thermally conductive layer 32 to the thickness D2 of the thermal insulation layer 31 is 0.015 ≤ D1 / D2 ≤ 0.0225. With this thickness ratio design, the thermally conductive layer 32 can effectively and uniformly conduct heat within the cell 21, while the thermal insulation layer 31 effectively prevents heat transfer between adjacent cells 21. In particular, the relatively thinner thickness of the thermally conductive layer 32 compared to the thermal insulation layer 31 ensures effective heat dissipation while minimizing the impact on the length of the battery pack 20. This design not only avoids an excessively large battery pack volume but also optimizes thermal management efficiency and improves the overall performance of the battery pack.

[0044] If this thickness ratio is not adopted, for example, if the thermal conductive layer 32 is too thick (D1 / D2>0.0225), the overall size of the battery pack will be too large, which will not only increase material costs, but may also lead to heat concentration due to the short heat dissipation path, reducing heat dissipation efficiency. Conversely, if the thermal conductive layer 32 is too thin (D1 / D2<0.015), it may not be able to effectively conduct heat, causing overheating inside the cell 21. Through a reasonable thickness ratio design, this invention achieves efficient heat dissipation and structural compactness of the battery pack, improves cooling efficiency and safety, makes it suitable for more application scenarios, and provides higher reliability and service life.

[0045] Further, see Figure 2 , 0.015mm≤D1≤0.05mm, 1mm≤D2≤2mm.

[0046] In one embodiment, see Figure 4 and Figure 5 At least two spacer pads 30 are provided at intervals along the width direction 80 or along the height direction 90 of the battery cell to form a heat insulation channel 40, and the spacer pads 30 extend along the height direction 90 of the battery cell.

[0047] In practical applications, firstly, the air in the heat insulation channel 40 has extremely low thermal conductivity, which effectively prevents direct heat transfer between the cells 21, improving the overall thermal management efficiency of the battery pack. Secondly, air, as a good heat insulation medium, forms a natural thermal resistance barrier in the channel, reducing thermal interference between adjacent cells 21.

[0048] Furthermore, because the spacers 30 are spaced apart, even if the dimensions of the spacers 30 differ from the standard dimensions during manufacturing, operators can still flexibly ensure that the spacers 30 do not protrude beyond the cell 21 by adjusting the width of the heat insulation channel 40. This design enhances the assembly flexibility of the battery pack, avoids assembly difficulties and structural instability caused by dimensional deviations, and ensures the reliability and consistency of the battery pack in practical applications.

[0049] Overall, this design not only optimizes the heat dissipation performance of the battery pack, but also improves the fault tolerance and assembly efficiency of the production process, making it better suited to various applications and production needs.

[0050] In this embodiment, there are two separator pads 30, and a heat insulation channel 40 extending along the height direction 90 of the battery cell is formed between adjacent separator pads 30. In other embodiments of this application, the number of separator pads 30 can be three, four, five, etc., and multiple separator pads 30 can also be arranged along the height direction 90 of the battery cell, and the separator pads 30 extend along the width direction 80 of the battery cell. In this case, the heat insulation channel 40 extends along the width direction 80 of the battery cell.

[0051] In one embodiment, reference is made to Figure 6 and Figure 7 The separator 30 has multiple notches 33, which penetrate the separator 30 along its thickness direction.

[0052] In practical applications, the space formed by the notch 33 can retain air, which, as an excellent thermal insulation medium, forms a thermal resistance barrier between adjacent cells 21. This effectively reduces thermal interference between adjacent cells 21 and improves the overall thermal management efficiency of the battery pack. By preventing direct heat transfer, the battery pack can better maintain a stable temperature distribution during use. Furthermore, the presence of the notch 33 not only reduces the weight of the separator 30 but also reduces the amount of material used, thereby lowering production costs. This material optimization allows the battery pack to maintain performance while possessing greater economic efficiency and competitiveness.

[0053] In addition, the notch 33 enhances the elasticity and flexibility of the separator 30, enabling it to better adapt to changes in space between the cells 21 during assembly, ensuring that the separator 30 can fit tightly against the surface of the cell 21, and further improving the thermal management effect.

[0054] In this embodiment, the notch 33 is square in shape. In other embodiments of this application, the notch 33 may be circular, triangular, pentagonal or other shapes.

[0055] In one embodiment, reference is made to Figure 3 The projection of the separator 30 in the thickness direction of the cell 21 falls inside the side of the cell 21.

[0056] In practical applications, when the dimensions of the spacer 30 deviate from the standard dimensions, the position of the spacer 30 can be adjusted to ensure that it does not protrude beyond the cell 21. This feature ensures the overall compactness of the battery pack structure and avoids assembly problems or increased battery pack volume caused by dimensional deviations of the spacer 30. Furthermore, this flexible adjustment capability increases the tolerance for errors during production, reduces the stringent requirements for manufacturing precision, and thus lowers production costs. Simultaneously, ensuring that the spacer 30 does not protrude beyond the cell 21 helps maintain the flatness of the battery pack's appearance and avoids potential wear or damage caused by protruding components.

[0057] In summary, by optimizing the position of the separator 30 in the thickness direction of the cell 21, this design not only improves the structural compactness and appearance integrity of the battery pack, but also enhances the flexibility and economy of the production process.

[0058] Furthermore, referring to Figure 3 The distance between the edge of the separator 30 and the edge of the battery cell 21 is D3, where 3mm≤D3≤7mm.

[0059] Optionally, refer to Figure 2 The battery pack also includes thermally conductive adhesive 50 and liquid cooling plate 60. Liquid cooling plate 60 is disposed at one end of battery pack 20 for heat dissipation of battery pack 20. Thermally conductive adhesive 50 is disposed between liquid cooling plate 60 and battery pack 20. Battery pack 20 is connected to liquid cooling plate 60 through thermally conductive adhesive 50. Thermally conductive adhesive 50 and spacer pad 30 are disposed at intervals.

[0060] In practical applications, the use of thermally conductive adhesive 50 between the battery pack 20 and the liquid cooling plate 60 ensures efficient heat conduction. This connection method not only provides good thermal contact but also absorbs and alleviates stress caused by thermal expansion, improving the overall stability of the battery pack. The spacing between the thermally conductive adhesive 50 and the spacer 30 reduces lateral heat conduction between the cells 21, further enhancing the safety of the battery pack.

[0061] In one embodiment, reference is made to Figure 1 The separator 30 is flexible and can deform along the thickness direction 70 of the battery cell.

[0062] In practical applications, the flexible spacer 30 can better conform to the surface of the cell 21, providing a more uniform heat insulation effect. This conformity ensures that heat conduction between cells 21 is effectively suppressed, thereby improving the overall thermal management performance of the battery pack. Secondly, the deformable nature of the spacer 30 in the thickness direction 70 of the cell allows it to adapt to dynamic changes within the battery pack, such as the expansion or contraction that the cell 21 may experience during charging and discharging. By absorbing these dimensional changes, the flexible spacer 30 can reduce mechanical stress on the cell 21 and extend its lifespan. Furthermore, this design also contributes to greater flexibility during assembly. The flexibility of the spacer 30 allows it to adapt to tolerance variations during manufacturing, ensuring good fit between components and improving production efficiency.

[0063] In summary, the flexible and deformable separator 30 not only optimizes the thermal management and mechanical stability of the battery pack, but also improves its adaptability and reliability in production and use.

[0064] In this embodiment, the heat insulation layer 31 can be polyurethane foam, polyethylene foam, aerogel, glass fiber or mineral fiber pad, etc., and the heat-conducting layer 32 can be made of heat-conducting silicone sheet, natural or synthetic graphite sheet, aluminum foil or copper foil, etc.

[0065] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0066] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0067] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0068] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A separator pad for a battery pack, the battery pack comprising a plurality of cells, characterized by, include: A heat insulation layer and a heat-conducting layer are provided, wherein the heat insulation layer is disposed between two adjacent battery cells, and the heat-conducting layer is attached to the battery cell; At least two spacer pads are provided at intervals between two adjacent cells, either along the width direction or the height direction of the cell, to form a heat insulation channel. The spacer pads extend along the height direction of the cell.

2. The separator pad of claim 1, wherein The thickness of a single thermally conductive layer is D1, and the thickness of the thermal insulation layer is D2, where 0.015 ≤ D1 / D2 ≤ 0.0225.

3. The separator pad of claim 2, wherein 0.015mm≤D1≤0.05mm.

4. The separator pad of claim 2, wherein 1mm≤D2≤2mm.

5. The separator pad of claim 1, wherein The separator pad has multiple notches that penetrate the separator pad along its thickness direction.

6. The separator pad according to any one of claims 1 to 5, wherein The projection of the separator pad in the thickness direction of the cell falls inside the side surface of the cell.

7. The separator pad of claim 6, wherein The distance between the edge of the separator pad and the edge of the battery cell is D3, where 3mm ≤ D3 ≤ 7mm.

8. The separator pad of claim 6, wherein The battery pack also includes thermally conductive adhesive and a liquid cooling plate. The liquid cooling plate is disposed at one end of the battery pack to dissipate heat from the battery pack. The thermally conductive adhesive is disposed between the liquid cooling plate and the battery pack. The battery pack is connected to the liquid cooling plate through the thermally conductive adhesive. The thermally conductive adhesive and the spacer are spaced apart.

9. The separator pad of claim 1, wherein The separator is flexible and can deform along the thickness direction of the battery cell.

10. A battery pack, characterized by, include: A plurality of battery cells and a spacer as described in any one of claims 1-9, wherein the plurality of battery cells are arranged sequentially to form a battery pack, and the spacer is disposed between two adjacent battery cells.

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