Separation assembly and battery module

Abstract

The utility model relates to the technical field of batteries, particularly provides a separation assembly and a battery module, and aims to solve the problem of how to consider the heat insulation performance and the buffer performance of a battery cell. In order to achieve the purpose, the partition assembly comprises a heat insulation part, the heat insulation part comprises a heat insulation pad and a packaging film wrapping the outer side of the heat insulation pad, and the packaging film extends towards the periphery and exceeds the edge of the heat insulation pad, so that a sealing edge is formed; and the buffering cushion is arranged on the sealing edge, and the thickness of the buffering cushion is larger than that of the heat insulation piece. According to the battery pack, the heat insulation part and the buffer pad are integrally arranged, the heat insulation part plays a role in blocking heat transfer between the battery cells, the buffer pad plays a role in buffering and shock insulation between the adjacent battery cells, and the accommodating space formed by the buffer pad and the heat insulation part can accommodate the raised parts on the surfaces of the battery cells; therefore, damage caused by rigid extrusion between the adjacent battery cells or between the battery cells and the heat insulation part is avoided, the battery cells are effectively protected, and normal operation of the battery module can be guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and specifically provides a separation component and a battery module. Background Art

[0002] With the increasing demand for battery performance in recent years, the capacity and charging rate of the current market's battery cells are getting higher and higher. During the long-term charge and discharge process of the battery pack, affected by factors such as environmental conditions and service life, each battery cell will inevitably have phenomena such as overheating and bulging.

[0003] Therefore, in order to improve the above phenomena, heat insulation parts are usually arranged between the battery cells to block the spread of heat. However, the heat insulation parts usually have a small deformation amount, and cannot provide an expansion space for accommodating the local bulging of the battery cells, nor can they play a buffering role between adjacent battery cells. And if elastic materials such as buffer cotton are arranged between the battery cells, the heat transfer between the battery cells cannot be blocked, which will affect all the battery cells in the battery pack.

[0004] Correspondingly, a new technical solution is needed in this field to solve the above problems. Utility Model Content

[0005] This application aims to solve the above technical problems, that is, to solve the problem of how to balance the heat insulation performance and buffering performance of the battery cells.

[0006] In a first aspect, this application provides a separation component for separating adjacent battery cells, which includes:

[0007] A heat insulation part, which includes a heat insulation pad and a packaging film wrapped around the outside of the heat insulation pad. The packaging film extends around and exceeds the edge of the heat insulation pad, thereby forming a sealing edge;

[0008] A buffer pad, which is arranged on the sealing edge, and the thickness of the buffer pad is greater than the thickness of the heat insulation part.

[0009] In a technical solution of the above separation component, the number of the buffer pads is at least two, and a accommodation space for the raised part of the battery cell to extend into is jointly formed between the surfaces of each buffer pad and the surface of the heat insulation part.

[0010] In a technical solution of the above separation component, there are two buffer pads, and each buffer pad extends along a first direction, and the two buffer pads are located on different sides of the heat insulation part in a second direction;

[0011] Wherein, the first direction is perpendicular to the second direction.

[0012] In a technical solution of the above separation component, the number of the buffer pads is more than three, and multiple buffer pads are arranged around the heat insulation part.

[0013] In one technical solution of the above-mentioned separating component, a first release film is adhered to the surface of the buffer pad facing away from the edge sealing, the first release film covers the buffer pad, and at least one end of the first release film extends beyond the edge of the buffer pad.

[0014] In one technical solution of the above-mentioned separating component, a positioning adhesive layer is adhered to the surface of the heat insulation member facing away from the first release film, and a second release film is adhered to the positioning adhesive layer.

[0015] In one technical solution of the above-mentioned separating component, the second release film covers the positioning adhesive layer, and at least one end of the second release film extends beyond the edge of the positioning adhesive layer.

[0016] In one technical solution of the above-mentioned separating component, the width of the edge sealing is 5 - 15 mm.

[0017] In a second aspect, the present application provides a battery module, which includes:

[0018] A housing;

[0019] A plurality of battery cells, which are arranged in the housing;

[0020] The separating component according to any one of the first aspects, which is arranged between adjacent battery cells.

[0021] In one technical solution of the above-mentioned separating component, the buffer pad is fixedly adhered to the battery cell.

[0022] In the case of adopting the above technical solutions, the present application arranges a buffer pad at the edge sealing of the encapsulation film of the heat insulation member. When the separating component is placed between adjacent battery cells, the heat insulation member plays a role in blocking heat transfer between the battery cells, and at the same time, the buffer pad plays a role in buffering and shock isolation between adjacent battery cells. On the other hand, due to the existence of the accommodation space between the buffer pad and the heat insulation member, when the battery cells are used for a long time and bulges or other raised parts are formed on their surfaces, the accommodation space can accommodate the raised parts, avoiding damage due to rigid extrusion between adjacent battery cells or between the battery cells and the heat insulation member, effectively protecting the battery cells, and further ensuring the normal operation of the battery module.

[0023] In addition, the existence of the buffer pad can also overcome the problem that the assembly is affected due to the poor flatness and large thickness tolerance of the surface of the battery cell, that is, the buffer pad and the accommodation space formed by it provide compensation for the assembly problems caused by the processing accuracy of the battery cell.

[0024] Furthermore, the buffer pad is adhesively fixed to the edge of the heat insulation pad, which can enhance the integrity of the separation component, thereby reducing the assembly difficulty of the battery module. On the other hand, the separation component is adhesively fixed to the battery cells on both sides thereof, without the need to provide other connection structures, thereby reducing the processing cost. Moreover, at least one end of the first release film extends beyond the edge of the buffer pad, which can facilitate the operator to manually tear the first release film from the buffer pad during installation, increasing the operational convenience and improving the work efficiency. Description of the Drawings

[0025] The preferred embodiments of the present application will be described below with reference to the drawings, in which:

[0026] Figure 1 is a schematic diagram of a separation component according to an embodiment of the present application;

[0027] Figure 2 is a side view of a separation component according to an embodiment of the present application;

[0028] Figure 3 is Figure 1 a partial enlarged view of part A in

[0029] Figure 4 is Figure 1 a schematic diagram from another perspective (the perspective when the lower surface of the heat insulation member 1 in Figure 1 is turned upwards) with the second release film hidden.

[0030] In the figures, the reference numerals refer to the following:

[0031] 1, heat insulation member; 11, heat insulation pad; 12, encapsulation film; 2, buffer pad; 21, first release film; 3, positioning adhesive layer; 31, second release film. Detailed Embodiments

[0032] The preferred embodiments of the present application will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0033] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or position relationships, are based on the directions or position relationships shown in the drawings. This is only for the convenience of description and does not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, ordinal numbers such as "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and defined, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] During the long-term charge and discharge process of the battery pack, affected by factors such as environmental temperature and charging voltage, a bulging bump is likely to form at a local position on the surface of the battery cell. The worse the environment and the longer the battery cell is used, the greater the probability of this phenomenon occurring. Moreover, when the battery pack operates for a long time, the temperature of each battery cell will rise. When a certain battery cell experiences short circuit, damage, etc., it may cause thermal runaway inside the battery cell, and the heat will spread among the battery cells, ultimately affecting the safety of other battery cells and even the entire module.

[0036] To improve the above phenomenon, in some related technologies, during the assembly process of the battery pack, a way of setting a square frame-shaped glue frame and a heat insulation pad between adjacent battery cells is adopted. The square frame-shaped glue frame surrounds the heat insulation pad on all sides. The square frame-shaped glue frame is used to connect adjacent battery cells, and the heat insulation pad is used to block the spread of heat. However, when both the square frame-shaped glue frame and the heat insulation pad are under pressure, their deformation amounts are relatively small, and they cannot provide a space for accommodating the bulging part on the surface of the battery cell. Moreover, the square frame-shaped glue frame also has a high manufacturing cost and is difficult to meet the requirements of cost reduction and efficiency improvement. In some other related technologies, a way of setting buffer cotton on both surfaces of the battery cell is also adopted, so that the bulging part on the surface of the battery cell compresses the buffer cotton. However, at the beginning of the assembly of the battery pack, this way will occupy too much space inside the battery pack due to the increase in the total thickness of the buffer pad, and there are also great drawbacks.

[0037] Refer to Figure 1 , which is a schematic diagram of a separation component according to an embodiment of the present application. It is arranged between adjacent battery cells and is used to separate the battery cells. The separation component includes a heat insulation member 1 and a buffer pad 2.

[0038] Among them, the heat insulation member 1 includes a heat insulation pad 11 and a packaging film 12. The heat insulation pad 11 can be made of materials such as fiberglass aerogel, pre-oxidized fiber aerogel, and ceramic aerogel. The heat insulation pad 11 is preferably a square plate-like structure. The packaging film 12 can be made of materials such as PI (polyimide), PVC (polyvinyl chloride), and PU (polyurethane). It wraps around the outside of the heat insulation pad 11 and plays a protective role for the heat insulation pad 11. In some implementation manners, the packaging film 12 can encapsulate the heat insulation pad 11 by using, for example, a thermoplastic process. The packaging film 12 extends around the surface of the heat insulation pad 11 and extends beyond the edge of the heat insulation pad 11, thereby forming a sealing edge. Optionally, the width of the sealing edge is 5-15 mm.

[0039] The buffer pad 2 is fixedly arranged on the sealing edge of the heat insulation pad 11. The buffer pad 2 can adopt structures such as silica gel foam and rubber pad. The thickness of the buffer pad 2 is greater than the thickness of the heat insulation member 1.

[0040] The number of the buffer pads 2 is at least two to increase the number of support points. For example, in an embodiment of the present application, two buffer pads 2 are provided, and both of the two buffer pads 2 are strip-shaped. For the convenience of description, in the plane of one surface of the heat insulation member 1, a first direction and a second direction are defined. The first direction is perpendicular to the second direction. For example, if the length direction of the heat insulation member 1 is the first direction, then the width direction of the heat insulation member 1 is the second direction.

[0041] Based on this, each buffer pad 2 extends along the first direction, and the two buffer pads 2 are located on different sides of the heat insulation member 1 in the second direction. For example, when each buffer pad 2 extends along the length direction of the heat insulation member 1, the two buffer pads 2 are respectively located on both sides of the width direction of the heat insulation member 1. When each buffer pad 2 extends along the width direction of the heat insulation member 1, the two buffer pads 2 are respectively located on both sides of the length direction of the heat insulation member 1.

[0042] Thus, referring to Figure 2 , since the thickness of the buffer pad 2 is greater than the thickness of the heat insulation member 1, therefore, on any side of the heat insulation member 1, a receiving space that is recessed toward the heat insulation member 1 is formed between the surface of the buffer pad 2 and the surface of the heat insulation member 1. The raised portion of the battery cell can extend into this receiving space. It should be noted that since the packaging film 12 is a flexible film, the depth of the above-mentioned receiving space is not fixed. For example, when a raised portion is formed on the surface of the battery cell on one side of the heat insulation member 1, the receiving space on the corresponding side of the raised portion may be larger.

[0043] In this application, a buffer pad 2 is provided at the sealing edge of the encapsulation film 12 of the heat insulation member 1. When the separation component is placed between adjacent battery cells, the heat insulation member 1 plays a role in blocking heat transfer between the battery cells, and at the same time, the buffer pad 2 plays a role in buffering and shock isolation between adjacent battery cells. On the other hand, due to the existence of the accommodation space between the buffer pad 2 and the heat insulation member 1, when the battery cells are used for a long time and bulges or other raised parts are formed on their surfaces, the accommodation space can accommodate the raised parts, avoiding damage caused by rigid extrusion between adjacent battery cells or between the battery cells and the heat insulation member 1, effectively protecting the battery cells, and thus ensuring the normal operation of the battery module.

[0044] In addition, the existence of the buffer pad 2 can also overcome the problem that the assembly is affected by the poor flatness and large thickness tolerance of the surface of the battery cell, that is, the buffer pad 2 and the accommodation space formed by it provide compensation for the assembly problems caused by the processing accuracy of the battery cell.

[0045] It should be noted that although in the above manner, the case where there are two buffer pads 2 is schematically described, it does not constitute a limitation to this application. For example, in some other implementation manners, the buffer pad 2 can also be in the form of a square or a disc, and the number thereof can be three, four or even more. A plurality of buffer pads 2 are arranged around the heat insulation member 1, and the above-mentioned accommodation space is formed between the surfaces of the plurality of buffer pads 2 and the surface of the heat insulation member 1. Of course, in some other forms, the buffer pad 2 can also be in a square frame structure, and in this case, the buffering effect can be maximally ensured.

[0046] Refer to Figure 1 and Figure 3 In an implementation manner of this application, adhesive layers are provided on both surfaces of the buffer pad 2. One surface is adhesively fixed to the sealing edge of the encapsulation film 12, and the other surface (the surface of the buffer pad 2 facing away from the sealing edge) is adhered with a first release film 21. The first release film 21 covers the buffer pad 2, the surface area of the first release film 21 is larger than the surface area of the buffer pad 2, and at least one end of the first release film 21 extends beyond the edge of the buffer pad 2.

[0047] Before the separation component is installed between adjacent battery cells, the first release film 21 covers the buffer pad 2 and forms an integral structure with the buffer pad 2. During the assembly of the battery module, the first release film 21 is torn off, so that the buffer pad 2 is adhesively fixed to the surface of the battery cell. At least one end of the first release film 21 extends beyond the edge of the buffer pad 2, which is to facilitate the staff to manually tear off the first release film 21, increase the operation convenience, and improve the work efficiency.

[0048] Refer to Figure 1 and Figure 4, optionally, a positioning adhesive layer 3 is adhered to the surface of the heat insulation member 1 facing away from the first release film 21. The form of the positioning adhesive layer 3 is also a double-sided adhesive, which can be adhered and fixed at the central position of the surface of the heat insulation member 1. A second release film 31 is adhered to the surface of the positioning adhesive layer 3 facing away from the heat insulation member 1. Through the arrangement of the positioning adhesive layer 3, when installing the separation component on the battery cell, the heat insulation member 1 can be first adhered and fixed to one of the battery cells through the positioning adhesive layer 3 to position the separation component, and then the other battery cell on the adjacent side is adhered and fixed to the buffer pad 2. In this way, not only can the separation component be fixed to the battery cells on both sides at the same time, but also through the pre-positioning of the separation component, a large-size offset of the heat insulation member 1 relative to the battery cell during the pasting process can be prevented.

[0049] Optionally, the second release film 31 covers the positioning adhesive layer 3, and at least one end of the second release film 31 extends beyond the edge of the positioning adhesive layer 3. The above setting is also to facilitate the operator to manually tear the second release film 31 from the positioning adhesive layer 3, increasing the convenience of operation and improving work efficiency. In some implementation manners, the surface area of the second release film 31 can be further increased. The surface area of the second release film 31 is larger than the surface area of the heat insulation member 1, and at least one end of the second release film 31 extends beyond the edge of the heat insulation member 1, so as to be more conducive to tearing the second release film 31.

[0050] It should be noted that, in the above, "at least one end of the first release film 21 extends beyond the edge of the buffer pad 2" means that the first release film 21 can be set such that one of its sides or a partial position of its side extends beyond the edge of the buffer pad 2, or it can be set such that multiple sides or all sides of it extend to beyond the edge of the buffer pad 2. This application does not limit this. The setting manner of the second release film 31 is the same, and this application will not elaborate too much here.

[0051] In this application, the buffer pad 2 is adhered and fixed to the edge sealing of the heat insulation pad 11 through an adhesive fixing method, which can enhance the integrity of the separation component, thereby reducing the assembly difficulty of the battery module. On the other hand, the separation component is fixed to the battery cells on both sides through an adhesive fixing method, without the need to set other connection structures, thereby reducing the processing cost.

[0052] This application also discloses a battery module, which includes a housing, a plurality of battery cells arranged in the housing, and a separation component arranged between adjacent battery cells. The separation component connects adjacent battery cells into one body, wherein the separation component is the separation component in any of the above embodiments.

[0053] It can be understood that before the separation component is installed, a first release film 21 is provided on its buffer pad 2. After the separation component is installed on the battery cell, the first release film 21 is torn off, and the separation component is adhered and fixed to the battery cell.

[0054] So far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, those skilled in the art can easily understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. A separating component for separating adjacent battery cells, characterized in that, Comprising: A heat insulation member, which includes a heat insulation pad and a packaging film wrapped around the outside of the heat insulation pad. The packaging film extends around and beyond the edge of the heat insulation pad to form a sealing edge. A buffer pad, which is disposed on the sealing edge, and the thickness of the buffer pad is greater than that of the heat insulation member.

2. The separation component according to claim 1, characterized in that, The number of the buffer pads is at least two, and a receiving space for the raised portion of the battery cell to extend into is jointly formed between the surfaces of each buffer pad and the surface of the heat insulation member.

3. The separation component according to claim 2, characterized in that, There are two buffer pads, and each buffer pad extends along a first direction. The two buffer pads are located on different sides of the heat insulation member in a second direction. Wherein, the first direction is perpendicular to the second direction.

4. The separation component according to claim 2, wherein The number of the buffer pads is more than three, and the plurality of buffer pads are arranged around the heat insulation member.

5. The separation component according to any one of claims 1 to 4, characterized in that A first release film is adhered to the surface of the buffer pad facing away from the sealing edge. The first release film covers the buffer pad, and at least one end of the first release film extends beyond the edge of the buffer pad.

6. The separation component according to claim 5, characterized in that, A positioning adhesive layer is adhered to the surface of the heat insulation member facing away from the first release film, and a second release film is adhered to the positioning adhesive layer.

7. The separating component according to claim 6, wherein The second release film covers the positioning adhesive layer, and at least one end of the second release film extends beyond the edge of the positioning adhesive layer.

8. The separation component according to claim 1, characterized in that The width of the sealing edge is 5-15 mm.

9. A battery module, characterized in that, Comprising: A housing; A plurality of battery cells, which are disposed in the housing; The partition assembly according to any one of claims 1 to 4, which is disposed between adjacent battery cells.

10. The battery module according to claim 9, characterized in that, The buffer pad is fixedly adhered to the battery cell.

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