Heat insulation buffer structure and battery module
By adopting a thermally insulated buffer structure in the battery module, including a heat insulating sheet and a multi-layer bonding buffer structure, the problems of poor heat transfer and difficult thickness tolerance of the battery module are solved, and the effect of reducing the risk of thermal runaway and production costs is achieved.
Patent Information
- Application Number
- CN202420643899.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The lack of thermal insulation between the existing battery modules between two adjacent battery cells leads to poor heat transfer, increasing the risk of thermal runaway, and the thickness tolerance is difficult to control, increasing production costs.
The thermal insulation buffer structure is adopted, including a heat insulation sheet, an adhesive layer, a buffer layer and a protective layer. Through these layers of design, the heat insulation sheet is bonded between two adjacent battery cells, filling the gap and blocking heat transfer.
It effectively reduces the risk of thermal runaway from the battery, controls the thickness tolerance of the battery module, and reduces assembly steps and production costs.
Smart Images
Figure CN222601148U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of lithium batteries, and in particular relates to a heat insulation buffer structure and a battery module. Background Art
[0002] With the development of technology, various electronic devices have become an indispensable part of daily life. In response to the increasing demand for high power in the system, the number of cells carried in the battery module is increasing.
[0003] The assembly of the battery module first requires placing multiple cells side by side, and then bundling them with steel strips to ensure the structural strength of the entire battery module and prevent the cells from squeezing each other, as well as deformation and damage under external forces. However, after bundling, there is a tolerance in the thickness of the battery module, and insulation treatment is also required between two adjacent cells to prevent thermal runaway from spreading and causing losses.
[0004] Most battery modules on the market do not have insulation or buffer materials between two adjacent cells, which can easily lead to heat transfer between the two adjacent cells and cause the risk of thermal runaway of the battery module. At the same time, the thickness tolerance of the battery module cannot be controlled.
[0005] Of course, there are also some battery modules that have insulation materials or buffer materials filled between two adjacent cells. Usually, manual installation is adopted to apply structural adhesive on the side walls of the two adjacent cells to bond the adjacent cells together. This installation method increases the assembly steps and production costs.
[0006] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content
[0007] The purpose of the utility model is to provide a heat-insulating buffer structure and a battery module, which can block the heat transfer between adjacent battery cells, reduce the risk of thermal runaway of the battery, reduce the assembly steps, and reduce production costs.
[0008] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:
[0009] A thermal insulation buffer structure, the thermal insulation buffer structure includes a thermal insulation sheet, the thermal insulation sheet includes a first surface and a second surface arranged opposite to each other, the first surface is provided with a first adhesive layer, a first buffer layer, a second adhesive layer and a first protective layer stacked in sequence, the second surface is provided with a third adhesive layer and a second protective layer stacked in sequence, the first protective layer can be peeled off and stacked on the second adhesive layer, and the second protective layer can be peeled off and stacked on the third adhesive layer.
[0010] In one or more embodiments of the present invention, the first bonding layer, the first buffer layer, and the second bonding layer are all located inside the first surface, and the first protective layer partially extends to the outside of the first surface; and / or,
[0011] The first bonding layer, the first buffer layer, the second bonding layer and the first protective layer are all longitudinally long and have the same width. The length of the first protective layer is greater than that of the second bonding layer.
[0012] In one or more embodiments of the present invention, the third adhesive layer is located inside the second surface, and the second protective layer partially extends to the outside of the second surface; and / or,
[0013] The third adhesive layer and the second protective layer are both longitudinally elongated and have equal widths, and the length of the second protective layer is greater than that of the third adhesive layer.
[0014] In one or more embodiments of the present invention, two opposite sides of the first surface are respectively provided with a first adhesive layer, a first buffer layer, a second adhesive layer, and a first protective layer stacked in sequence.
[0015] In one or more embodiments of the present invention, the thermal insulation sheet is a mica thermal insulation sheet; and / or,
[0016] The first buffer layer includes at least one foam layer; and / or,
[0017] The thickness of the thermal insulation sheet is 0.2 mm to 1 mm; and / or,
[0018] The thickness of the first buffer layer is 1 mm to 5 mm; and / or,
[0019] The thickness of the first adhesive layer, the second adhesive layer and the first protective layer are all 0.1 mm to 0.3 mm.
[0020] In one or more embodiments of the present invention, a fourth adhesive layer and a second buffer layer stacked in sequence are further provided on the second surface, and the third adhesive layer is stacked on the second buffer layer.
[0021] In one or more embodiments of the present invention, the fourth bonding layer, the second buffer layer, and the third bonding layer are all located inside the second surface, and the second protective layer partially extends to the outside of the second surface; and / or,
[0022] The thickness of the second buffer layer is 1 mm to 5 mm; and / or,
[0023] The fourth adhesive layer, the third adhesive layer, and the second protective layer are all longitudinally long and have the same width, and the length of the second protective layer is greater than that of the third adhesive layer.
[0024] In one or more embodiments of the present invention, two opposite sides of the second surface are respectively provided with a fourth adhesive layer, a second buffer layer, a third adhesive layer, and a second protective layer stacked in sequence.
[0025] In one or more embodiments of the present invention, the second buffer layer includes at least one foam layer; and / or,
[0026] The thickness of the third adhesive layer, the second buffer layer, the fourth adhesive layer and the second protective layer are all 0.1 mm to 0.3 mm.
[0027] Another specific embodiment of the present invention provides a technical solution as follows:
[0028] A battery module, comprising:
[0029] Multiple cells;
[0030] The heat-insulating buffer structure is the heat-insulating buffer structure after the first protective layer and the second protective layer are peeled off, and the second adhesive layer and the third adhesive layer are respectively bonded to two adjacent battery cells.
[0031] Compared with the prior art, the utility model has the following beneficial effects:
[0032] The utility model provides a heat-insulating buffer structure and a battery module. The heat-insulating buffer structure can fill the gap between two adjacent battery cells of the battery module, block the heat transfer of the adjacent battery cells through the heat-insulating sheet, and reduce the risk of thermal runaway of the battery.
[0033] Through the design of the first buffer layer and the second buffer layer, the thickness of the heat-insulating buffer structure has a variable range, so as to fill the different gaps between two adjacent battery cells, control the thickness of the entire battery module within a reasonable thickness range, and control the thickness tolerance of the battery module;
[0034] Through the design of the second adhesive layer and the third adhesive layer, the heat insulation buffer structure can be quickly and reliably bonded between two adjacent battery cells without the need for manual gluing, thus reducing assembly steps and lowering production costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0036] Figure 1 This is a schematic cross-sectional view of the heat insulation buffer structure in the first embodiment of the present utility model;
[0037] Figure 2 This is a schematic diagram of the main structure of the heat insulation buffer structure in the first embodiment of the utility model;
[0038] Figure 3 This is a schematic diagram of the three-dimensional structure of the heat insulation buffer structure in the first embodiment of the utility model;
[0039] Figure 4 This is a schematic cross-sectional view of the heat insulation buffer structure in the second embodiment of the present utility model;
[0040] Figure 5 This is a schematic diagram of the main structure of the heat insulation buffer structure in the second embodiment of the present utility model;
[0041] Figure 6 This is a schematic diagram of the three-dimensional structure of the heat insulation buffer structure in the second embodiment of the present utility model;
[0042] Figure 7 This is a schematic cross-sectional view of the battery module in the third embodiment of the present utility model;
[0043] Figure 8 It is a schematic cross-sectional structural diagram of a battery module in Embodiment 4 of the present utility model. DETAILED DESCRIPTION
[0044] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.
[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0046] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.
[0047] The technical solution of the present utility model will be described below in conjunction with the accompanying drawings.
[0048] Embodiment 1:
[0049] Reference Figure 1As shown, the heat insulation buffer structure in this embodiment includes a heat insulation sheet 1, which includes a first surface 11 and a second surface 12 arranged opposite to each other. The first surface 11 is provided with a first adhesive layer 21, a first buffer layer 22, a second adhesive layer 23 and a first protective layer 24 stacked in sequence, and the second surface 12 is provided with a third adhesive layer 31 and a second protective layer 32 stacked in sequence. The first protective layer 24 can be peeled off and stacked on the second adhesive layer 23, and the second protective layer 32 can be peeled off and stacked on the third adhesive layer 31. The first protective layer 24 and the second protective layer 32 can be peeled off from the second adhesive layer 23 and the third adhesive layer 31 respectively under the action of external force, so that the second adhesive layer 23 and the third adhesive layer 31 are exposed to the air, so as to be bonded with other structures.
[0050] Since the heat-insulating buffer structure has a certain thickness, when the heat-insulating buffer structure in this embodiment is used, it can fill the gap between two adjacent battery cells of the battery module. The heat transfer between adjacent battery cells is blocked by the heat-insulating sheet 1, thereby reducing the risk of thermal runaway of the battery. Through the design of the first buffer layer 22, the overall thickness of the heat-insulating buffer structure can have a variable range, so as to adapt to the different sizes of spacing between any two adjacent battery cells, so as to control the thickness of the entire battery module within a reasonable thickness range, so that the thickness tolerance of the battery module is controlled. Through the design of the second adhesive layer 23 and the third adhesive layer 31, the heat-insulating buffer structure can be bonded between two adjacent battery cells without the need for manual gluing, reducing assembly steps and reducing production costs.
[0051] The first protective layer 24 can be torn manually or peeled off mechanically, which facilitates production operations and reduces labor costs.
[0052] Specifically, refer to Figure 1 As shown, the first surface 11 in this embodiment is provided with a first adhesive layer 21, a first buffer layer 22, a second adhesive layer 23, and a first protective layer 24 stacked in sequence on opposite sides thereof.
[0053] The second adhesive layers 23 on opposite sides of the first surface 11 can both be bonded to the battery cell. Since the first adhesive layer 21, the first buffer layer 22, and the second adhesive layer 23 stacked in sequence on the first surface 11 have a certain thickness, a cavity located beside the first surface 11 can be formed between the heat-insulating buffer structure and the battery cell, and the cavity can be used for heat dissipation. Therefore, in actual use, this design can improve the heat dissipation effect of the battery module.
[0054] In order to facilitate the peeling of the first protective layer 24, refer to Figure 1 to Figure 3 As shown, in this embodiment, the first bonding layer 21 , the first buffer layer 22 , and the second bonding layer 23 are all located inside the first surface 11 , and a portion of the first protective layer 24 extends to the outside of the first surface 11 .
[0055] In order to save materials while protecting the second adhesive layer 23 by the first protective layer 24, refer to Figure 1 to Figure 3 As shown, the first adhesive layer 21 , the first buffer layer 22 , the second adhesive layer 23 , and the first protective layer 24 in this embodiment are all longitudinally long and have equal widths, and the length of the first protective layer 24 is greater than that of the second adhesive layer 23 .
[0056] In order to facilitate the peeling of the second protective layer 32, refer to Figure 1 to Figure 3 As shown, the third bonding layer 31 in this embodiment is located inside the second surface 12, and the second protective layer 32 partially extends to the outside of the second surface 12. Preferably, the length and width of the third bonding layer 31 are substantially the same as the length and width of the thermal insulation sheet 1. The length and width of the second protective layer 32 are slightly larger than the length and width of the thermal insulation sheet 1.
[0057] In order to save materials while protecting the third adhesive layer 31 through the second protective layer 32, refer to Figure 1 to Figure 3 As shown, the third adhesive layer 31 and the second protective layer 32 in this embodiment are both longitudinally long and have equal widths, and the length of the second protective layer 32 is greater than that of the third adhesive layer 31 .
[0058] Preferably, the heat insulation sheet 1 in this embodiment is a mica heat insulation sheet 1. The mica heat insulation sheet 1 can withstand a high temperature of 800°C and has a heat insulation effect.
[0059] Preferably, the first buffer layer 22 in this embodiment includes at least one foam layer, wherein the foam layer can be a CR foam layer or an EPDM foam layer, both of which have good flame retardancy.
[0060] The thickness of the heat insulation sheet 1 in this embodiment is 0.2 mm to 1 mm. For example, the thickness of the heat insulation sheet 1 is 0.5 mm. Of course, the present application is not limited thereto, and the thickness of the heat insulation sheet 1 can also be 0.2 mm, or 1 mm, or any value between 0.2 mm and 1 mm.
[0061] The thickness of the first buffer layer 22 in this embodiment is 1 mm to 5 mm. For example, the thickness of the first buffer layer 22 is 2.5 mm. Of course, the present application is not limited thereto, and the thickness of the first buffer layer 22 can also be 1 mm, or 5 mm, or any value between 1 mm and 5 mm.
[0062] In this embodiment, the thickness of the first adhesive layer 21, the first buffer layer 22, the second adhesive layer 23, and the first protective layer 24 are all 0.1 mm to 0.3 mm. For example, the thickness of the first adhesive layer 21, the first buffer layer 22, the second adhesive layer 23, and the first protective layer 24 are all 0.5 mm. Of course, the present application is not limited thereto, and the thickness of the first adhesive layer 21, the first buffer layer 22, the second adhesive layer 23, and the first protective layer 24 can also be 0.2 mm, or 1 mm, or any value between 0.2 mm and 1 mm.
[0063] Embodiment 2:
[0064] Reference Figure 4 As shown, the structure stacked sequentially on the first surface 11 of the insulation sheet 1 in this embodiment is substantially the same as the structure stacked sequentially on the first surface 11 of the insulation sheet 1 in the first embodiment, except that the structure stacked sequentially on the second surface 12 of the insulation sheet 1 is different.
[0065] Specifically, the second surface 12 in this embodiment is further provided with a fourth adhesive layer 41 and a second buffer layer 42 stacked in sequence, and the third adhesive layer 31 is stacked on the second buffer layer 42. That is, the fourth adhesive layer 41, the second buffer layer 42, the third adhesive layer 31, and the second protective layer 32 are stacked in sequence on the second surface 12 in this embodiment.
[0066] The thermal insulation buffer structure in this embodiment enables the overall thickness of the thermal insulation buffer structure to have a larger variable range on the basis of the first embodiment, so as to better adapt to the different sizes of spacing between any two adjacent battery cells, so as to control the thickness of the entire battery module within a reasonable thickness range, so that the thickness tolerance of the battery module can be controlled.
[0067] The second protective layer 32 can be torn manually or peeled off mechanically, which facilitates production operations and reduces labor costs.
[0068] Specifically, refer to Figure 4 As shown, the second surface 12 of the present embodiment is provided with a fourth adhesive layer 41 , a second buffer layer 42 , a third adhesive layer 31 , and a second protective layer 32 stacked in sequence on opposite sides thereof.
[0069] The third adhesive layer 31 on both sides of the second surface 12 can be bonded to the battery cell. Since the fourth adhesive layer 41, the second buffer layer 42, and the third adhesive layer 31 stacked in sequence on the second surface 12 have a certain thickness, a cavity located beside the second surface 12 can be formed between the heat-insulating buffer structure and the battery cell, and the cavity can be used for heat dissipation. Therefore, in actual use, this design can further improve the heat dissipation effect of the battery module on the basis of the first embodiment.
[0070] In order to facilitate the peeling of the second protective layer 32, refer to Figures 4 to 6 As shown, the fourth bonding layer 41 , the second buffer layer 42 , and the third bonding layer 31 in this embodiment are all located inside the second surface 12 , and a portion of the second protective layer 32 extends to the outside of the second surface 12 .
[0071] In order to save materials while protecting the third adhesive layer 31 through the second protective layer 32, refer to Figures 4 to 6 As shown, the fourth adhesive layer 41 , the second buffer layer 42 , the third adhesive layer 31 , and the second protective layer 32 in this embodiment are all longitudinally long and have equal widths, and the length of the second protective layer 32 is greater than that of the third adhesive layer 31 .
[0072] Preferably, the second buffer layer 42 in this embodiment includes at least one foam layer, wherein the foam layer can be a CR foam layer or an EPDM foam layer, both of which have good flame retardancy.
[0073] The thickness of the second buffer layer 42 in this embodiment is 1 mm to 5 mm. For example, the thickness of the second buffer layer 42 is 2.5 mm. Of course, the present application is not limited thereto, and the thickness of the second buffer layer 42 can also be 1 mm, or 5 mm, or any value between 1 mm and 5 mm.
[0074] In this embodiment, the thickness of the third adhesive layer 31, the second buffer layer 42, the fourth adhesive layer 41, and the second protective layer 32 are all 0.1 mm to 0.3 mm. Exemplarily, the thickness of the third adhesive layer 31, the second buffer layer 42, the fourth adhesive layer 41, and the second protective layer 32 are all 0.5 mm. Of course, the present application is not limited thereto, and the thickness of the third adhesive layer 31, the second buffer layer 42, the fourth adhesive layer 41, and the second protective layer 32 can also be 0.2 mm, or 1 mm, or any value between 0.2 mm and 1 mm.
[0075] Embodiment three:
[0076] Reference Figure 7 As shown, the battery module in this embodiment includes: a plurality of battery cells 5 and a heat-insulating buffer structure 101 after the first protective layer 24 and the second protective layer 32 are peeled off as shown in the first embodiment, and the second adhesive layer 23 and the third adhesive layer 31 of the heat-insulating buffer structure 101 are respectively bonded to two adjacent battery cells 5. According to this design, the gap between two adjacent battery cells 5 of the battery module can be filled by the heat-insulating buffer structure 101 to block the heat transfer of the adjacent battery cells 5 and reduce the risk of thermal runaway of the battery; the thickness of the entire battery module is controlled within a reasonable thickness range, so as to reduce the thickness tolerance of the battery module; at the same time, the assembly steps can be reduced and the production cost can be reduced.
[0077] Embodiment 4:
[0078] Reference Figure 8 As shown, the battery module in this embodiment includes: a plurality of battery cells 5 and a heat-insulating buffer structure 102 after the first protective layer 24 and the second protective layer 32 are peeled off as shown in the second embodiment, and the second adhesive layer 23 and the third adhesive layer 31 of the heat-insulating buffer structure 102 are respectively bonded to two adjacent battery cells 5. According to this design, the gap between two adjacent battery cells 5 of the battery module can be filled by the heat-insulating buffer structure 102 to block the heat transfer of the adjacent battery cells 5 and reduce the risk of thermal runaway of the battery; the thickness of the entire battery module is controlled within a reasonable thickness range, so as to reduce the thickness tolerance of the battery module; at the same time, the assembly steps can be reduced and the production cost can be reduced.
[0079] It can be seen from the above technical solutions that the utility model has the following beneficial effects:
[0080] The utility model provides a heat-insulating buffer structure and a battery module. The heat-insulating buffer structure can fill the gap between two adjacent battery cells of the battery module, block the heat transfer of the adjacent battery cells through the heat-insulating sheet, and reduce the risk of thermal runaway of the battery.
[0081] Through the design of the first buffer layer and the second buffer layer, the thickness of the heat-insulating buffer structure has a variable range, so as to fill the different gaps between two adjacent battery cells, control the thickness of the entire battery module within a reasonable thickness range, and control the thickness tolerance of the battery module;
[0082] Through the design of the second adhesive layer and the third adhesive layer, the heat insulation buffer structure can be quickly and reliably bonded between two adjacent battery cells without the need for manual gluing, thus reducing assembly steps and lowering production costs.
[0083] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
[0084] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A heat insulation buffer structure, characterized in that: The thermal insulation buffer structure includes a thermal insulation sheet, which includes a first surface and a second surface arranged opposite to each other, wherein a first adhesive layer, a first buffer layer, a second adhesive layer and a first protective layer stacked in sequence are provided on the first surface, and a third adhesive layer and a second protective layer stacked in sequence are provided on the second surface, wherein the first protective layer can be peeled off and stacked on the second adhesive layer, and the second protective layer can be peeled off and stacked on the third adhesive layer.
2. The heat insulation buffer structure according to claim 1, characterized in that: The first bonding layer, the first buffer layer, and the second bonding layer are all located inside the first surface, and the first protective layer partially extends to the outside of the first surface; and / or, The first bonding layer, the first buffer layer, the second bonding layer and the first protective layer are all longitudinally long and have the same width. The length of the first protective layer is greater than that of the second bonding layer.
3. The heat insulation buffer structure according to claim 1, characterized in that: The third adhesive layer is located inside the second surface, and the second protective layer partially extends to the outside of the second surface; and / or, The third adhesive layer and the second protective layer are both longitudinally elongated and have the same width, and the length of the second protective layer is greater than that of the third adhesive layer.
4. The heat insulation buffer structure according to claim 1, characterized in that: Two opposite sides of the first surface are respectively provided with a first adhesive layer, a first buffer layer, a second adhesive layer, and a first protective layer stacked in sequence.
5. The heat insulation buffer structure according to claim 1, characterized in that: The thermal insulation sheet is a mica thermal insulation sheet; and / or, The first buffer layer includes at least one foam layer; and / or, The thickness of the thermal insulation sheet is 0.2 mm to 1 mm; and / or, The thickness of the first buffer layer is 1 mm to 5 mm; and / or, The thickness of the first adhesive layer, the second adhesive layer and the first protective layer are all 0.1 mm to 0.3 mm.
6. The heat insulation buffer structure according to claim 1, characterized in that: The second surface is also provided with a fourth adhesive layer and a second buffer layer stacked in sequence, and the third adhesive layer is stacked on the second buffer layer.
7. The heat insulation buffer structure according to claim 6, characterized in that: The fourth bonding layer, the second buffer layer, and the third bonding layer are all located inside the second surface, and the second protective layer partially extends to the outside of the second surface; and / or, The fourth adhesive layer, the second buffer layer, the third adhesive layer, and the second protective layer are all longitudinally long and have the same width, and the length of the second protective layer is greater than that of the third adhesive layer.
8. The heat insulation buffer structure according to claim 6, characterized in that: The fourth adhesive layer, the second buffer layer, the third adhesive layer, and the second protective layer stacked in sequence are respectively disposed on two opposite sides of the second surface.
9. The heat insulation buffer structure according to claim 6, characterized in that: The second buffer layer includes at least one foam layer; and / or, The thickness of the second buffer layer is 1 mm to 5 mm; and / or, The thickness of the third adhesive layer, the fourth adhesive layer and the second protective layer are all 0.1 mm to 0.3 mm.
10. A battery module, characterized in that: The battery module comprises: Multiple cells; The thermal insulation buffer structure is the thermal insulation buffer structure after the first protective layer and the second protective layer are peeled off in any one of claims 1 to 9, and the second adhesive layer and the third adhesive layer are respectively bonded to two adjacent battery cells.