Battery cell heat insulation pad and battery module

Abstract

The utility model relates to a battery cell heat insulation pad and a battery module. The battery cell heat insulation pad comprises a heat insulation core body, the upper surface and the lower surface of the heat insulation core body are coated with the upper hot melting film and the lower hot melting film respectively, at least one of the upper hot melting film and the lower hot melting film is provided with a concave part, and the heat insulation core body is contained in the concave part. Flash parts extend out of the peripheries of the upper hot melting film and the lower hot melting film far away from the heat insulation core body, and the flash part of the upper hot melting film and the flash part of the lower hot melting film are bonded and fixed together; and the buffer piece is fixed on the flash part of the upper hot melting film. According to the battery cell heat insulation pad, the heat insulation core body is directly coated with the upper hot melting film and the lower hot melting film, and the buffer piece is arranged on the flash part of the upper hot melting film, so that the upper hot melting film and the lower hot melting film can be completely and tightly attached to the surface of the heat insulation core body, and the heat insulation core body is better coated and protected by the hot melting films, so that a good heat insulation effect is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery cell heat insulation pad and a battery module. BACKGROUND

[0002] When a lithium battery is discharged, a chemical reaction occurs inside the battery, generating a large amount of heat energy, causing the temperature of the battery cell inside the battery to rise. The frequent heating of the battery cell will cause the battery to age, and if it is long-term, it will cause the internal air to expand violently, causing the battery to protrude outward, and in severe cases, it will cause the battery to burn. Therefore, in order to ensure that the battery cell and the battery cell will not cause heating due to heat transfer, a buffer heat insulation pad is usually placed between the two battery cells.

[0003] Chinese patent CN219937181U discloses a battery cell heat insulation pad, which sets a heat insulation body in the accommodating cavity of the buffer frame; both sides of the buffer frame are provided with a hot melt film. The hot melt film is attached to both surfaces of the buffer frame by attaching the two peripheral parts, and the two main parts seal the accommodating cavity, so that the heat insulation body is firmly and reliably embedded in the accommodating cavity and will not be squeezed out of the buffer frame due to the expansion of the battery cell, ensuring that the heat insulation pad can be used normally. In combination with the double-sided adhesive layer attached to the corresponding peripheral part, the double-sided adhesive layer is only bonded to the periphery of the battery cell, and during the operation of the battery cell, the expansion part at the middle position of the battery cell will not contact the double-sided adhesive layer, so that the battery cell can normally shrink after expansion, effectively prolonging the service life of the battery cell.

[0004] However, this arrangement has the following defects: there is a gap between the edge of the accommodating cavity, the hot melt film and the surface of the heat insulation body, and the fit is not tight. When the battery module cell is out of control and fails, it cannot effectively block the heat. UTILITY MODEL CONTENT

[0005] Therefore, it is necessary to provide a battery cell heat insulation pad to solve the problem that the heat cannot be effectively blocked when the battery module cell is out of control and fails. A battery module is also proposed.

[0006] According to an aspect of the present application, a battery cell heat insulation pad comprises: a heat insulation core; an upper hot melt film and a lower hot melt film, the upper hot melt film and the lower hot melt film are respectively wrapped on the upper and lower surfaces of the heat insulation core, at least one of the upper hot melt film and the lower hot melt film has a recessed part, the recessed part accommodates the heat insulation core, the periphery of the upper hot melt film and the lower hot melt film has a flash part extending away from the heat insulation core, and the flash part of the upper hot melt film and the flash part of the lower hot melt film are bonded and fixed together; a buffer member fixed on the flash part of the upper hot melt film.

[0007] In some embodiments, the number of buffer members is 2, and they are located on both sides of the heat insulation core.

[0008] In some embodiments, the buffer member is arranged around the heat insulation core.

[0009] In some embodiments, the buffer element includes at least two buffer strips joined end to end in the circumferential direction surrounding the thermal insulation core.

[0010] In some embodiments, the buffer element includes at least two sequentially spliced ​​buffer strips in the circumferential direction surrounding the heat insulation core, wherein the end of the first buffer strip abuts against the side of the second buffer strip in two adjacent buffer strips.

[0011] In some embodiments, the buffer is made of silicone.

[0012] In some embodiments, the height of the buffer is higher than the upper surface of the heat insulation core; the cell heat insulation pad also includes two adhesive layers and two release papers, the two release papers being bonded to the buffer and the lower hot melt film respectively through the two adhesive layers.

[0013] In some embodiments, both adhesive layers are double-sided adhesive paper.

[0014] In some embodiments, the periphery of the release paper includes at least one protruding tear.

[0015] In some embodiments, both the upper and lower hot melt films are PET films.

[0016] According to another aspect of this application, a battery module includes multiple battery cells, with the aforementioned battery cell heat insulation pads disposed between adjacent battery cells.

[0017] The aforementioned cell heat insulation pad directly covers the heat insulation core with an upper and lower hot melt film. The buffer is set on the edge of the upper hot melt film, which allows the upper and lower hot melt films to be 100% tightly attached to the surface of the heat insulation core. The heat insulation core is better covered and protected by the hot melt film, thus achieving a good heat insulation effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the assembly structure of the cell heat insulation pad according to an embodiment of this application.

[0019] Figure 2 for Figure 1 The top view of the battery cell heat insulation pad shown.

[0020] Figure 3 for Figure 2 Sectional view along the AA direction.

[0021] Figure 4 for Figure 3 A magnified view of point X in the middle.

[0022] Figure 5 for Figure 1 The exploded view of the battery cell heat insulation pad is shown.

[0023] Figure 6 An exploded view of a cell thermal insulation pad according to another embodiment of the present application.

[0024] Figure 7 A structural schematic view of a buffer according to an embodiment of the present application.

[0025] Figure 8 A structural schematic view of another embodiment of the buffer according to the present application.

[0026] Figure 9 A structural schematic view of yet another embodiment of the buffer according to the present application.

[0027] Figure 10 A schematic view of a cell thermal insulation pad and a cell in cooperation according to an embodiment of the present application.

[0028] Reference signs:

[0029] 100, cell thermal insulation pad; 10, thermal insulation core; 20, upper hot melt film; 210, recessed portion; 220, flash portion; 30, lower hot melt film; 40, buffer; 410, buffer strip; 411, first buffer strip; 412, second buffer strip; 50, adhesive layer; 60, release paper; 610, tear portion; 1, battery module; 200, cell. DETAILED DESCRIPTION

[0030] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using these specific details in other ways, and the skilled person can make similar improvements without departing from the scope of the present application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, if there are these terms "first", "second", these terms are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one feature. In the description of the present application, if there are terms "a plurality of", the meaning of "a plurality of" is at least 2, for example, 2, three, etc., unless otherwise specifically limited.

[0033] An aspect of the present application provides a battery cell thermal insulation pad. Referring to Figures 1 to 5 , wherein Figure 1 is a schematic diagram of the assembly structure of the battery cell thermal insulation pad 100 of an embodiment of the present application. Figure 2 is Figure 1 is a top view of the battery cell thermal insulation pad 100 shown. Figure 3 is Figure 2 is a sectional view in the direction of A-A in Figure 4 is Figure 3 is an enlarged view of the position X in Figure 5 is Figure 1 is an exploded view of the battery cell thermal insulation pad 100 shown.

[0034] As shown in the figure, the battery cell thermal insulation pad 100 of an embodiment of the present application includes a thermal insulation core 10, an upper hot melt film 20 and a lower hot melt film 30, and a buffer 40. The upper hot melt film 20 and the lower hot melt film 30 are respectively wrapped on the upper and lower surfaces of the thermal insulation core 10. At least one of the upper hot melt film 20 and the lower hot melt film 30 has a recessed portion 210, which accommodates the thermal insulation core 10. The peripheries of the upper hot melt film 20 and the lower hot melt film 30 each have a flash portion 220 extending away from the thermal insulation core 10. The flash portion 220 of the upper hot melt film 20 and the flash portion 220 of the lower hot melt film 30 are bonded and fixed together. The buffer 40 is fixed on the flash portion 220 of the upper hot melt film 20.

[0035] The thermal insulation core 10 is used to isolate the heat transfer between the battery cells, for example, aerogel can be selected.

[0036] The upper hot melt film 20 and the lower hot melt film 30 are respectively wrapped from the upper and lower surfaces of the thermal insulation core 10, and both wrap the thermal insulation core 10 inside. The flash portion 220 of the upper hot melt film 20 and the flash portion 220 of the lower hot melt film 30 can be bonded and fixed together, for example, by a hot pressing process. After the flash portion 220 of the upper hot melt film 20 and the flash portion 220 of the lower hot melt film 30 are bonded and fixed together, the upper hot melt film 20 and the lower hot melt film 30 will seal the thermal insulation core 10 inside.

[0037] In the present application, the upper hot melt film 20 is provided with a recessed portion 210. Specifically, the lower surface of the upper hot melt film 20 is provided with the recessed portion 210; the recessed portion 210 protrudes out of the upper surface of the upper hot melt film 20 towards the upper surface side of the upper hot melt film 20. The flash portion 220 of the upper hot melt film 20 protrudes outwards from the bottom periphery of the recessed portion 210.

[0038] In the present application, the bottom surface of the heat insulation core body 10 is in contact with the upper surface of the lower hot melt film 30. At the same time, the heat insulation core body 10 is at least partially accommodated in the recessed portion 210 described above. That is, the depth of the recessed portion 210 can be greater than the thickness of the heat insulation core body 10, or can be equal to the thickness of the heat insulation core body 10. The flash portion 220 of the upper hot melt film 20 and the flash portion 220 of the lower hot melt film 30 are then bonded and fixed together.

[0039] In other embodiments, the lower hot melt film 30 is also provided with a recessed portion 210. Specifically, the upper surface of the lower hot melt film 30 is also provided with a recessed portion 210; the recessed portion 210 protrudes out of the lower surface of the lower hot melt film 30 towards the lower surface side of the lower hot melt film 30. The flash portion 220 of the lower hot melt film 30 protrudes outwards from the bottom periphery of the recessed portion 210. At this time, the heat insulation core body 10 is accommodated in the space surrounded by the two recessed portions 210.

[0040] It should be noted that in the present application, at least one of the upper hot melt film 20 and the lower hot melt film 30 has a recessed portion 210, which means that the recessed portion 210 has already been provided before the buffer member 40 is covered.

[0041] The buffer member 40 is fixed on the flash portion 220 of the upper hot melt film 20, for example, by means of adhesion. The buffer member 40 is used to enhance the buffering performance of the battery heat insulation pad 100, so that the battery heat insulation pad 100 is not easily damaged when subjected to external force, greatly prolonging the service life of the product.

[0042] The battery heat insulation pad 100 of the present application directly covers the heat insulation core body 10 with the upper hot melt film 20 and the lower hot melt film 30, and the buffer member 40 is arranged on the flash portion 220 of the upper hot melt film 20, so that the upper hot melt film 20 and the lower hot melt film 30 are 100% tightly bonded to the surface of the heat insulation core body 10, the heat insulation core body 10 is better protected by the hot melt film, thereby achieving good heat insulation effect.

[0043] In some embodiments, the number of buffer members 40 is two, located on both sides of the heat insulation core body 10. Referring to Figure 5 As shown, the buffer member 40 is provided with two, respectively located on both sides of the heat insulation core body 10. Specifically, the two buffer members 40 can be located on both sides in the length direction of the heat insulation core body 10, or can be located on both sides in the width direction of the heat insulation core body 10.

[0044] The buffer 40 is arranged on the two sides of the heat insulation core 10, so that the battery cell heat insulation pad 100 is uniformly stressed when subjected to external force, and good buffering effect is achieved.

[0045] In the battery cell heat insulation pad 100 of the present application, the buffer 40 is arranged on the flash part 220 of the upper hot melt film 20. During preparation of the battery cell heat insulation pad 100, the buffer 40 is arranged after the battery cell heat insulation pad 100 is directly wrapped with the upper hot melt film 20 and the lower hot melt film 30, so that the buffer 40 is arranged in a simple manner, and the structure is flexible. Details are described below with reference to the drawings.

[0046] In some embodiments, referring to Figure 6 , the buffer 40 is arranged around the heat insulation core 10. Optionally, the buffer 40 is in a rectangular ring shape, a circular ring shape, etc., so that the battery cell heat insulation pad 100 is uniformly stressed in the circumferential direction when subjected to external force, and the buffering performance is better.

[0047] The buffer 40 can be an integral structure or a multi-piece structure. Referring to Figure 7 and Figure 8 , the buffer 40 includes at least two buffer strips 410 that are sequentially spliced at the head and tail in the circumferential direction around the heat insulation core 10.

[0048] In one embodiment, referring to Figure 7 , the buffer 40 includes four L-shaped buffer strips 410 that are sequentially spliced at the head and tail. The four L-shaped buffer strips 410 form a rectangular ring structure, and each L-shaped buffer strip 410 occupies a corner of the rectangular ring structure. Referring to Figure 8 , in another embodiment, the buffer 40 includes two buffer strips 410 that are sequentially spliced at the head and tail, and the two buffer strips 410 form a rectangular ring structure.

[0049] Referring to Figure 9 , in yet another embodiment, the buffer 40 includes at least two buffer strips 410 that are sequentially spliced in the circumferential direction around the heat insulation core 10, and the end of the first buffer strip 410 abuts against the side of the second buffer strip 410 among the two adjacent buffer strips 410.

[0050] Specifically, in the present embodiment, two lengths of buffer strips 410 are provided, which are a first buffer strip 411 and a second buffer strip 412, and the number of each length of buffer strip 410 is two. The length of the first buffer strip 411 is greater than the length of the second buffer strip 412, and the widths of the two are the same. The first buffer strip 411 and the second buffer strip 412 are sequentially and staggered arranged in the circumferential direction around the heat insulation core 10, and the end of the second buffer strip 412 abuts against the side of the first buffer strip 411.

[0051] When the buffer 40 includes two or more buffer strips 410, the buffer strips 410 can be bonded together between adjacent buffer strips 410 in addition to being bonded to the upper hot melt film 20. The buffer strip 410 is specifically a flat strip with a large length-width ratio; for example, the length can be 5 times or more than the width.

[0052] In some embodiments, the buffer 40 is made of silica gel. The buffer 40 made of silica gel has good buffering performance.

[0053] In some embodiments, as shown in Figure 3 and Figure 4 , the height of the buffer 40 is higher than the upper surface of the heat insulation core 10; the battery cell heat insulation pad 100 further includes two adhesive layers 50 and two release papers 60, the two release papers 60 are bonded to the buffer 40 and the lower hot melt film 30 respectively through the two adhesive layers 50.

[0054] In this application, the release paper 60 is bonded to the buffer 40 or the lower hot melt film 30 through the adhesive layer 50, which protects the heat insulation core 10 and is easy to tear off. In addition, the height of the buffer 40 is higher than the upper surface of the heat insulation core 10, so that the buffer 40 can be bonded to the battery cell and provide space for the middle part of the battery cell to expand.

[0055] In some embodiments, the two adhesive layers 50 are both double-sided adhesive papers. The adhesive layer 50 preferably uses a double-sided adhesive paper. In this way, after the release paper 60 is torn off, the upper surface of the adhesive layer 50 still has adhesion, so as to be bonded to the battery cell.

[0056] In some embodiments, the periphery of the release paper 60 includes at least one protruding tear part 610.

[0057] As shown in Figure 5 , one pair of oppositely arranged end portions of the release paper 60 respectively extend outwardly by two tear parts 610. The tear parts 610 at both ends are symmetrically arranged about the center of the release paper 60, which facilitates the operation of automatic equipment.

[0058] In some embodiments, the upper hot melt film 20 and the lower hot melt film 30 are both PET films. The bonding effect of the PET film after hot pressing is excellent, and the hot pressing process is convenient to operate, which can facilitate continuous or intermittent operation.

[0059] Please refer to Figure 10 , one aspect of the present application proposes a battery module 1, which includes a plurality of battery cells 200, and the battery cell heat insulation pad 100 is arranged between adjacent battery cells 200. The battery module 1 can be specifically an energy storage battery module or a power battery module. The battery cell heat insulation pad 100 is the battery cell heat insulation pad of any one of the above embodiments. The battery cell heat insulation pad 100 is arranged between two adjacent battery cells 200, so that the battery cells 200 will not cause heating due to heat transfer.

[0060] In the present application, unless specifically defined otherwise, if there appears the terms "mount", "connect", "connection", "fix", and the like, these terms should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the present application, unless specifically defined otherwise, if there appears the terms "mount", "connect", "connection", "fix", and the like, these terms should be interpreted broadly. For example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0062] It should be noted that if an element is referred to as "fixed to" or "disposed to" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0063] The technical features of the above embodiments can be combined in any way. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0064] The above embodiments only express several implementation ways of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be noted that for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, which are within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. An electrochemical cell thermal insulation pad, characterized by, The application relates to a battery cell thermal insulation pad. The battery cell thermal insulation pad comprises: a thermal insulation core; an upper hot melt film and a lower hot melt film, the upper hot melt film and the lower hot melt film being respectively coated on upper and lower surfaces of the thermal insulation core, at least one of the upper hot melt film and the lower hot melt film being provided with a recess part for accommodating the thermal insulation core, and the peripheries of the upper hot melt film and the lower hot melt film being provided with flash parts extending away from the thermal insulation core, the flash part of the upper hot melt film and the flash part of the lower hot melt film being bonded and fixed together; 2. The cell insulation mat of claim 1, wherein, a buffer part fixed on the flash part of the upper hot melt film.

3. The cell insulation mat of claim 1, wherein, The number of the buffer parts is two, and the two buffer parts are located on two sides of the thermal insulation core.

4. The cell insulation mat of claim 3, wherein, The buffer parts are arranged around the thermal insulation core.

5. The cell insulation mat of claim 3, wherein, In the circumferential direction around the thermal insulation core, the buffer part comprises at least two buffer strips which are sequentially spliced together.

6. The cell insulation mat of claim 1, wherein, In the circumferential direction around the thermal insulation core, the buffer part comprises at least two buffer strips which are sequentially spliced together, and in the two adjacent buffer strips, the end part of the first buffer strip is in abutment with the side part of the second buffer strip.

7. The cell insulation mat of claim 1, wherein, The material of the buffer part is silica gel.

8. The cell insulation mat of claim 7, wherein, The height of the buffer part is higher than that of the upper surface of the thermal insulation core.

9. The cell insulation mat of claim 8, wherein, The battery cell thermal insulation pad further comprises two adhesive layers and two release papers, and the two release papers are respectively bonded to the buffer part and the lower hot melt film through the two adhesive layers.

10. A battery module comprising a plurality of cells, characterized by, The two adhesive layers are double-sided adhesive papers. The periphery of the release paper comprises at least one protruding tearing part. Adjacent battery cells are provided with the battery cell thermal insulation pad as claimed in any one of claims 1 to 9.

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