Battery pack and electric device

Abstract

The utility model provides a battery pack and a power utilization device, and relates to the field of power batteries, the battery pack comprises a glue blocking assembly, a box body and a battery cell, the battery cell is arranged in the box body, and the glue blocking assembly is arranged between the box body and the battery cell; the glue blocking assembly comprises a supporting piece and an elastic sealing piece. The supporting piece is provided with a first surface and a second surface, and the first surface is opposite to the second surface; the elastic sealing piece is connected with the supporting piece, covers the first surface and the second surface, and elastically abuts against the box body and the battery cell. The first surface and the second surface can elastically abut against the box body and the battery cell through the elastic sealing pieces respectively, so that a local gap between the box body and the battery cell is blocked, glue poured between the box body and the battery cell is blocked, the glue is not prone to overflowing, and the problems that the heat conduction capacity is reduced and the cost is increased due to the fact that the glue overflows are solved.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and in particular to a battery pack and an electrical device. Background Technology

[0002] Current societal development faces two major challenges: energy shortages and environmental problems. Against this backdrop, new energy electric vehicles have rapidly emerged, alleviating these two issues to some extent. As a core component of new energy electric vehicles, the power battery plays a crucial role.

[0003] Adhesive is a crucial component of power batteries. Currently, a significant portion of power batteries utilize adhesive between the casing and the battery cells to enhance their safety.

[0004] However, different adhesives have different flowability and viscosity. When using adhesives with low viscosity and good flowability, adhesive overflow often occurs, preventing the required adhesive coverage area from being achieved. This reduces thermal conductivity and consequently affects the heat dissipation of the entire battery pack. At the same time, adhesive overflow also increases product cost. Utility Model Content

[0005] To address the problem of glue overflow in existing technologies, one of the objectives of this invention is to provide a battery pack.

[0006] This utility model provides the following technical solution:

[0007] A battery pack includes a rubber-blocking assembly, a housing, and battery cells, wherein the battery cells are disposed within the housing, and the rubber-blocking assembly is disposed between the housing and the battery cells;

[0008] The adhesive-blocking assembly includes a support member and an elastic sealing member;

[0009] The support member has a first surface and a second surface, wherein the first surface and the second surface are opposite to each other;

[0010] The elastic seal is connected to the support and covers the first surface and the second surface, and the elastic seal elastically abuts against the housing and the battery cell.

[0011] As a further optional feature of the battery pack, the support member also has a third surface that is in contact with both the first surface and the second surface, and the resilient seal also covers the third surface.

[0012] As a further alternative to the battery pack, the support member has a square cross-section, and the resilient seal has a receiving groove in its cross-section to accommodate the support member, thereby surrounding or partially surrounding the support member.

[0013] As a further alternative to the battery pack, the resilient seal is a resilient porous layer.

[0014] As a further optional feature of the battery pack, the compression of the resilient seal is 20-35%.

[0015] As a further optional solution for the battery pack, the support member is a support plate, and the support plate is an insulating and flame-retardant plate.

[0016] As a further optional feature of the battery pack, the support member is provided with weight-reduction holes.

[0017] As a further alternative to the battery pack, the support member includes a first side plate, a second side plate, and two third side plates;

[0018] The first side plate and the second side plate are disposed opposite to each other. The side of the first side plate facing away from the second side plate has the first surface, and the side of the second side plate facing away from the first side plate has the second surface.

[0019] One side of each of the two third side plates is connected to the first side plate, and the other side is connected to the second side plate. The first side plate, the second side plate, and the two third side plates surround each other to form the weight reduction hole.

[0020] As a further alternative to the battery pack, the first surface faces the housing and elastically abuts against the housing via the resilient seal;

[0021] The second surface faces the battery cell and elastically abuts against the battery cell through the elastic seal;

[0022] The sum of the thickness of the support member, the thickness of the elastic seal on the first surface, and the thickness of the elastic seal on the second surface is greater than the gap width between the housing and the battery cell.

[0023] Another objective of this invention is to provide an electrical device.

[0024] This utility model provides the following technical solution:

[0025] An electrical device includes the aforementioned battery pack.

[0026] The embodiments of this utility model have the following beneficial effects:

[0027] In the aforementioned battery pack, the adhesive-blocking assembly is positioned between the casing and the battery cells. Since both the first and second surfaces are covered with elastically deformable sealing elements, the first and second surfaces can elastically abut against the casing and battery cells respectively through these sealing elements, thereby sealing the localized gaps between the casing and the battery cells. This prevents the adhesive injected between the casing and the battery cells from overflowing, thus mitigating the problems of reduced thermal conductivity and increased costs caused by adhesive overflow.

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present invention is shown;

[0031] Figure 2 This diagram shows an overall structural schematic of a sealant assembly provided in an embodiment of the present invention.

[0032] Figure 3 A front view of a sealing assembly provided in an embodiment of the present invention is shown;

[0033] Figure 4 This diagram illustrates the overall structure of a sealant assembly provided in one specific embodiment of the present invention.

[0034] Explanation of key component symbols:

[0035] 10 - Adhesive blocking assembly; 20 - Housing; 30 - Battery cell; 40 - Adhesive filling chamber;

[0036] 100 - Support member; 110 - First side plate; 120 - Second side plate; 130 - Third side plate; 101 - First surface; 102 - Second surface; 103 - Third surface; 104 - Weight reduction hole; 200 - Elastic seal; 210 - Receiving groove. Detailed Implementation

[0037] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0038] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] Please refer to the following: Figure 1 and Figure 2 This embodiment provides a battery pack, including a sealant assembly 10, a housing 20, and battery cells 30, with the sealant assembly 10 disposed between the housing 20 and the battery cells 30. The sealant assembly 10 consists of a support member 100 and an elastic sealing member 200.

[0043] Please combine Figure 3 The support member 100 has a first surface 101 and a second surface 102, and the first surface 101 and the second surface 102 are opposite to each other.

[0044] Accordingly, the elastic seal 200 is connected to the support 100 and covers the first surface 101 and the second surface 102, and the elastic seal 200 elastically abuts against the housing 20 and the battery cell 30.

[0045] In the aforementioned battery pack, the adhesive-blocking assembly 10 is disposed between the housing 20 and the battery cell 30. Since both the first surface 101 and the second surface 102 are covered with elastically deformable sealing elements 200, the first surface 101 and the second surface 102 can elastically abut against the housing 20 and the battery cell 30 respectively through the elastic sealing elements 200, thereby sealing the local gap between the housing 20 and the battery cell 30. This acts as a barrier against the adhesive injected between the housing 20 and the battery cell 30, preventing the adhesive from overflowing and thus alleviating the problems of reduced thermal conductivity and increased cost caused by adhesive overflow.

[0046] In some embodiments, the first surface 101 faces the inner wall side of the housing 20 and elastically abuts against the inner wall side of the housing 20 via the elastic seal 200.

[0047] Accordingly, the second surface 102 faces the sidewall of the cell 30 and elastically abuts against the sidewall of the cell 30 through the elastic seal 200.

[0048] Furthermore, the sum of the thickness of the support member 100, the thickness of the elastic seal 200 located on the first surface 101, and the thickness of the elastic seal 200 located on the second surface 102 is greater than the gap width between the housing 20 and the battery cell 30. When the adhesive-blocking assembly 10 is placed between the housing 20 and the battery cell 30, the elastic seal 200 is compressed and deformed, forming an interference fit with the housing 20 and the battery cell 30.

[0049] In some specific embodiments, the support member 100 is in the shape of a cuboid, and the first surface 101 and the second surface 102 are the two outer surfaces of the support member 100 along the thickness direction (or the length direction, the width direction). In this case, the first surface 101 and the second surface 102 are parallel, which is suitable for situations where the sidewall of the battery cell 30 is parallel to the inner sidewall of the housing 20.

[0050] In some other embodiments, if the sidewall of the battery cell 30 is not parallel to the inner wall of the housing 20, but forms a certain angle, the support member 100 can also be of other shapes. Accordingly, the first surface 101 and the second surface 102 are not parallel to each other; it is sufficient that the first surface 101 is parallel to the inner wall of the housing 20, and the second surface 102 is parallel to the sidewall of the battery cell 30.

[0051] In this embodiment, the support member 100 is a support plate, which is suitable for situations where the gap between the housing 20 and the battery cell 30 is narrow. The support plate has a first surface 101 on one side along the normal direction and a second surface 102 on the other side along the normal direction.

[0052] In addition, the thickness of the support plate along the normal direction is less than the gap width between the housing 20 and the battery cell 30, and the sum of the thickness of the support plate, the thickness of the elastic seal 200 located on the first surface 101 and the thickness of the elastic seal 200 located on the second surface 102 is greater than the gap width between the housing 20 and the battery cell 30.

[0053] When the sealing assembly 10 is placed between the housing 20 and the battery cell 30, the elastic seal 200 located on the first surface 101 and the elastic seal 200 located on the second surface 102 are both deformed by pressure.

[0054] Furthermore, the support plate is an insulating and flame-retardant plate to ensure that the insulation and fire resistance between the battery cell 30 and the housing 20 meet the requirements.

[0055] Optionally, the insulating flame-retardant board is made of PC material with a thickness of 3mm, a dielectric strength of not less than 2500V / mm, a volume resistivity of not less than 10^16Ω.cm, and a flame retardant rating of V0 under the UL94 flammability test.

[0056] Please see Figure 4 In another embodiment of this application, the support member 100 may also be a block structure with greater thickness, which is suitable for situations where the gap between the housing 20 and the battery cell 30 is wider.

[0057] At this time, in order to reduce the weight of the adhesive baffle assembly 10, a weight reduction hole 104 is provided on the support member 100 to avoid the battery pack being too heavy after the adhesive baffle assembly 10 is added.

[0058] In some specific embodiments, the support member 100 consists of a first side plate 110, a second side plate 120, and two third side plates 130.

[0059] The first side plate 110 and the second side plate 120 are disposed opposite to each other. The side of the first side plate 110 facing away from the second side plate 120 has a first surface 101, and the side of the second side plate 120 facing away from the first side plate 110 has a second surface 102.

[0060] In addition, one side of each of the two third side plates 130 is connected to the first side plate 110, and the other side is connected to the second side plate 120. The first side plate 110, the second side plate 120 and the two third side plates 130 surround each other to form a weight reduction hole 104.

[0061] In use, the first side plate 110 is held against the inner wall side of the housing 20 by the elastic sealing element 200 covering the first surface 101, causing the elastic sealing element 200 to deform under pressure, thereby sealing the first side plate 110 with the housing 20. Similarly, the second side plate 120 is held against the side wall of the battery cell 30 by the elastic sealing element 200 covering the second surface 102, causing the elastic sealing element 200 to deform under pressure, thereby sealing the second side plate 120 with the battery cell 30.

[0062] At this time, the third side plate 130, the elastic seal 200 covering the first surface 101, and the elastic seal 200 covering the second surface 102 work together to seal the local gap between the housing 20 and the battery cell 30, thus blocking the glue injected between the housing 20 and the battery cell 30.

[0063] Optionally, the first side plate 110, the second side plate 120 and the third side plate 130 are integrally formed or welded together.

[0064] Optionally, the first side plate 110, the second side plate 120, and the third side plate 130 are all elongated and parallel to the length direction of the support member 100. In this case, the first side plate 110, the second side plate 120, and the two third side plates 130 pass through the support member 100 along the length direction of the support member 100 around the weight reduction hole 104 formed.

[0065] Please refer to the following: Figure 3 and Figure 4 Furthermore, for fluid adhesives, the greater the pressure applied, the easier they flow. In other words, the adhesive at the bottom of the gap between the housing 20 and the battery cell 30 is most likely to overflow. To prevent adhesive from overflowing between the adhesive-blocking assembly 10 and the bottom inner wall of the housing 20, the support member 100 also has a third surface 103, which is in contact with the first surface 101 and the second surface 102, and the elastic seal 200 also covers the third surface 103.

[0066] In use, the support 100 is placed between the battery pack housing 20 and the battery cell 30, with the third surface 103 facing the bottom inner wall of the housing 20, until the third surface 103 is press-fitted with the housing 20 through the elastic seal 200, thereby enhancing the sealing between the support 100 and the bottom inner wall of the housing 20, so that the glue is not easy to overflow from there.

[0067] Please see Figure 4 In some embodiments, the support member 100 has a square cross-section. Correspondingly, the resilient seal 200 has a square receiving groove 210 in its cross-section. The receiving groove 210 is used to receive the support member 100 such that the resilient seal 200 surrounds or partially surrounds the support member 100.

[0068] Specifically, the receiving groove 210 can be an open groove, with the elastic seal 200 partially surrounding the support member 100. Alternatively, the receiving groove 210 can also be a closed groove, with the elastic seal 200 surrounding the support member 100.

[0069] Optionally, the elastic seal 200 covering the first surface 101, the elastic seal 200 covering the third surface 103, and the elastic seal 200 covering the second surface 102 are sequentially connected and integrally formed to form an open receiving groove 210.

[0070] Optionally, the third surface 103 is the end face of one end of the support member 100 along its length.

[0071] In this embodiment, the elastic seal 200 is an elastic porous layer. The elastic porous layer is connected to the support 100 and covers the first surface 101 and the second surface 102, or covers the first surface 101, the second surface 102 and the third surface 103.

[0072] When in use, the pores of the elastic porous layer can absorb the adhesive, which not only prevents the adhesive from flowing, but also gives the elastic porous layer a certain thermal conductivity, thereby improving the heat dissipation of the battery pack.

[0073] Optionally, the elastic porous layer is attached to the support 100 by adhesive backing.

[0074] Furthermore, the compression amount of the elastic seal 200 is 20-35%. The compression amount of the elastic seal 200 refers to the ratio of the difference between the thickness of the elastic seal 200 before compression and the thickness of the elastic seal 200 after compression, to the thickness of the elastic seal 200 before compression.

[0075] Understandably, if the compression of the elastic seal 200 is too large, it will be difficult to insert the sealant assembly 10 between the housing 20 and the battery cell 30, making installation difficult. Conversely, if the compression of the elastic seal 200 is too small, it may not be able to fit tightly against the housing 20 and the battery cell 30, resulting in insufficient sealing. Therefore, keeping the compression of the elastic seal 200 between 20% and 35% can better balance installation convenience and sealing performance.

[0076] In some specific embodiments, the elastic porous layer is foam. The compression of the foam is 28.5%, and the thickness of the foam before compression is 26±0.5 mm.

[0077] In another embodiment of this application, the elastic seal 200 may also be made of rubber.

[0078] In summary, in the aforementioned battery pack, there are one or more gaps between the housing 20 and the battery cell 30. Adhesive-blocking assemblies 10 are paired and positioned at both ends of each gap. The housing 20, the battery cell 30, and the two adhesive-blocking assemblies 10 at both ends of the gap together form a potting cavity 40. Adhesive is poured into this potting cavity 40, and after the adhesive cures, the battery cell 30 is fixed in place. Simultaneously, the heat generated by the battery cell 30 is transferred to the housing 20 for further heat dissipation.

[0079] The first surface 101 of the support member 100 faces the inner wall side of the housing 20, and the third surface 103 faces the inner wall bottom of the housing 20. Correspondingly, the second surface 102, which is opposite to the first surface 101, faces the side wall of the battery cell 30.

[0080] Since the first surface 101, the second surface 102 and the third surface 103 are all covered with elastic seals 200 that can be elastically deformed, the first surface 101 can elastically abut against the inner wall side of the housing 20 through the elastic seals 200, the second surface 102 can elastically abut against the side wall of the battery cell 30 through the elastic seals 200, and the third surface 103 can elastically abut against the bottom surface of the inner wall of the housing 20 through the elastic seals 200.

[0081] At this time, the glue-blocking component 10 seals the local gap between the housing 20 and the battery cell 30, which blocks the glue injected between the housing 20 and the battery cell 30, making it difficult for the glue to overflow, thereby alleviating the problem of reduced heat conductivity and increased cost caused by glue overflow.

[0082] This embodiment also provides an electrical device, including the battery pack described above.

[0083] In some specific implementations, the electrical device is the power system of a new energy electric vehicle.

[0084] Experimental Example

[0085] Adhesion blocking tests were conducted using a battery pack testing method. A casing 20 and an adhesive blocking component 10 were prepared. The adhesive blocking component 10 was inserted into the casing 20, and adhesive was poured into the casing 20. The adhesive was allowed to cure, and the leakage was observed. Five sets of experiments were conducted, including experimental groups 1-5. Experimental group 1 used the adhesive blocking component 10 provided in this application, with a compression of 15% for the elastic seal 200; experimental group 2 used the adhesive blocking component 10 provided in this application, with a compression of 20% for the elastic seal 200; experimental group 3 used the adhesive blocking component 10 provided in this application, with a compression of 28% for the elastic seal 200; experimental group 4 used the adhesive blocking component 10 provided in this application, with a compression of 35% for the elastic seal 200; and experimental group 5 used the adhesive blocking component 10 provided in this application, with a compression of 40% for the elastic seal 200. A control group was also provided, the difference being the absence of the adhesive blocking component 10.

[0086] The test results are shown in the table below.

[0087]

[0088] The test results show that the control group experienced severe adhesive leakage, which, as described in the background section, leads to poor thermal conductivity. Alternatively, using a higher viscosity adhesive would increase product costs. Experimental groups 1-5, which utilize the adhesive-blocking component 10 provided in this application, can alleviate adhesive overflow to varying degrees, thereby improving thermal conductivity or reducing product costs. Experimental groups 2 and 4 are considered superior, with group 3 being the best.

[0089] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0090] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0091] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, It includes a glue-blocking assembly (10), a housing (20), and a battery cell (30), wherein the battery cell (30) is disposed inside the housing (20), and the glue-blocking assembly (10) is disposed between the housing (20) and the battery cell (30); The adhesive-blocking assembly (10) includes a support member (100) and an elastic sealing member (200); The support member (100) has a first surface (101) and a second surface (102), wherein the first surface (101) and the second surface (102) are opposite to each other; The elastic seal (200) is connected to the support (100) and covers the first surface (101) and the second surface (102), and the elastic seal (200) elastically abuts against the housing (20) and the battery cell (30).

2. The battery pack according to claim 1, characterized in that, The support member (100) also has a third surface (103) that is in contact with the first surface (101) and the second surface (102) respectively, and the elastic seal (200) also covers the third surface (103).

3. The battery pack according to claim 2, characterized in that, The support member (100) has a square cross-section, and the elastic seal (200) has a receiving groove (210) in its cross-section to accommodate the support member (100) so as to surround or partially surround the support member (100).

4. The battery pack according to claim 1, 2 or 3, characterized in that, The elastic seal (200) is an elastic porous layer.

5. The battery pack according to claim 4, characterized in that, The compression of the elastic seal is 20-35%.

6. The battery pack according to claim 1, 2 or 3, characterized in that, The support member (100) is a support plate, and the support plate is an insulating and flame-retardant plate.

7. The battery pack according to claim 1, 2 or 3, characterized in that, The support member (100) is provided with weight reduction holes (104).

8. The battery pack according to claim 7, characterized in that, The support member (100) includes a first side plate (110), a second side plate (120), and two third side plates (130); The first side plate (110) and the second side plate (120) are disposed opposite to each other. The side plate (110) facing away from the second side plate (120) has the first surface (101), and the side plate (120) facing away from the first side plate (110) has the second surface (102). One side of each of the two third side plates (130) is connected to the first side plate (110), and the other side is connected to the second side plate (120). The first side plate (110), the second side plate (120), and the two third side plates (130) surround each other to form the weight reduction hole (104).

9. The battery pack according to claim 1, characterized in that, The first surface (101) faces the housing (20) and elastically abuts against the housing (20) through the elastic seal (200); The second surface (102) faces the battery cell (30) and elastically abuts against the battery cell (30) through the elastic seal (200); The sum of the thickness of the support member (100), the thickness of the elastic seal member (200) located on the first surface (101), and the thickness of the elastic seal member (200) located on the second surface (102) is greater than the gap width between the housing (20) and the battery cell (30).

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-9.

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