Battery pack

Abstract

The utility model provides a kind of battery pack.The battery pack includes: box body component, box body component has accommodating cavity;At least one battery pack, battery pack includes at least one battery monomer arranged along first direction;At least one insulation structure, the outer surface of at least one battery monomer is provided with insulation structure, insulation structure is at least arranged at the bottom surface of battery monomer, and insulation structure is provided with at least one avoiding opening corresponding the bottom surface of battery monomer, to make at least a part of the bottom surface of battery monomer exposed and be bonded fixed with the bottom plate of box body component.The utility model solves the problem that the shearing strength of battery insulation structure and structural adhesive cannot meet the design requirements of battery pack in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0002] The casing of a single battery cell is typically covered with an insulating structure to form a battery assembly. This insulating structure is usually encapsulated by covering the large side (the side with the largest surface area), the small side (the side with the smallest surface area), and the bottom side of the battery. When the battery assemblies are arranged into a battery pack and installed, structural adhesive is applied to the bottom surface of the battery assemblies to bond them to the bottom plate of the battery pack's casing assembly for secure fixation. As the required strength for the battery pack's fixation within the battery pack increases, the shear strength requirements between the bottom surface of the battery cell and the bottom plate also increase. In existing technologies, the commonly used battery insulation structure on the surface of the battery cell casing is PET (polyethylene terephthalate) material with adhesive backing. The shear strength of this type of battery insulation structure and structural adhesive no longer meets the design requirements.

[0003] Therefore, existing technologies suffer from the problem that the shear strength of the battery insulation structure and structural adhesive cannot meet the design requirements of the battery pack. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack that solves the problem that the shear strength of the battery insulation structure and structural adhesive in the prior art cannot meet the design requirements of the battery pack.

[0005] To achieve the above objectives, according to one aspect of the present invention, a battery pack is provided, comprising: a housing assembly having a receiving cavity; at least one battery pack including at least one battery cell arranged along a first direction; at least one insulating structure, wherein the outer surface of at least one battery cell is provided with the insulating structure, the insulating structure is at least disposed on the bottom surface of the battery cell, and the insulating structure is provided with at least one clearance opening corresponding to the bottom surface of the battery cell, so that at least a portion of the bottom surface of the battery cell is exposed and bonded and fixed to the bottom plate of the housing assembly.

[0006] Furthermore, the bottom plate of the housing assembly has a raised structure corresponding to the clearance opening, and the exposed part of the bottom surface of the battery cell is bonded and fixed to the raised structure.

[0007] Furthermore, the battery pack also includes a liquid cooling plate disposed on the base plate, at least a portion of which is disposed around the raised structure, and the liquid cooling plate is in thermal contact with the bottom surface of the battery cell.

[0008] Furthermore, the insulating structure has at least two clearance openings spaced apart along the second direction on the bottom surface of the battery cell, and the first direction and the second direction are perpendicular to each other.

[0009] Furthermore, the protruding structure extends along the first direction, and the same protruding structure corresponds to at least one clearance opening in each insulating structure of the same battery pack.

[0010] Furthermore, there are multiple protrusions, which are spaced apart along the second direction, and the same protrusion corresponds to an avoidance opening in each insulating structure of the same battery pack.

[0011] Furthermore, the battery pack also includes a liquid cooling plate disposed on the base plate, at least a portion of which is disposed between adjacent protruding structures and / or between the protruding structures and the circumferential inner sidewall of the housing assembly, and the liquid cooling plate is in thermally conductive contact with the bottom surface of the battery cell.

[0012] Furthermore, in the third direction, the height of the protruding structure is the same as the height of the portion of the liquid cooling plate located between two adjacent protruding structures and / or between the protruding structure and the circumferential inner sidewall of the housing assembly, and the first direction, the second direction, and the third direction are mutually perpendicular to each other.

[0013] Furthermore, a thermally conductive medium layer exists between the insulating structure and the liquid cooling plate.

[0014] Furthermore, the clearance opening has a clearance gap around the bottom edge of the corresponding battery cell.

[0015] Applying the technical solution of this utility model, the battery pack in this application includes a housing assembly, at least one battery pack, and at least one insulating structure. The housing assembly has a receiving cavity; the battery pack includes at least one battery cell arranged along a first direction; the outer surface of at least one battery cell is provided with an insulating structure, the insulating structure is at least disposed on the bottom surface of the battery cell, and the insulating structure is provided with at least one clearance opening corresponding to the bottom surface of the battery cell, so that at least a portion of the bottom surface of the battery cell is exposed and bonded and fixed to the bottom plate of the housing assembly.

[0016] When using the battery pack of this application, the insulating structure is at least disposed on the bottom surface of the battery cell and covers at least a portion of the battery cell to provide insulation protection. Simultaneously, because the insulating structure has clearance openings corresponding to the bottom surface of the battery cell, the portion of the battery cell exposed through the clearance openings can be directly bonded and fixed to the bottom plate of the housing assembly using structural adhesive, thereby improving the shear strength between the battery cell and the bottom plate. Therefore, the battery assembly of this application effectively solves the problem in the prior art where the shear strength of the battery insulating structure and structural adhesive cannot meet the design requirements of the battery pack. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the structure of a battery pack according to a specific embodiment of this application is shown;

[0019] Figure 2 It shows Figure 1 An exploded view of part of the battery pack structure;

[0020] Figure 3 It shows Figure 1 A schematic diagram showing the positional relationship between the battery cells, insulation structure, and insulation patches in the battery pack.

[0021] Figure 4 A schematic diagram of the insulation structure corresponding to the bottom surface of a battery cell is shown in a specific embodiment of this application.

[0022] The above figures include the following reference numerals:

[0023] 10. Housing assembly; 11. Raised structure; 20. Battery pack; 21. Battery cell; 211. Positive terminal; 212. Negative terminal; 30. Insulation structure; 31. Clearance opening; 311. First opening; 312. Second opening; 313. Third opening; 32. Window; 40. Liquid cooling plate; 50. Insulating patch. Detailed Implementation

[0024] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0026] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0027] To address the problem that the shear strength of the battery insulation structure 30 and the structural adhesive in the prior art cannot meet the design requirements of the battery pack, this application provides a battery pack.

[0028] like Figures 1 to 4 As shown, the battery pack in this application includes a housing assembly 10, at least one battery pack 20, and at least one insulating structure 30. The housing assembly 10 has a receiving cavity; the battery pack 20 includes at least one battery cell 21 arranged along a first direction; the outer surface of at least one battery cell 21 is provided with an insulating structure 30, the insulating structure 30 is at least disposed on the bottom surface of the battery cell 21, and the insulating structure 30 is provided with at least one clearance opening 31 corresponding to the bottom surface of the battery cell 21, so that at least a portion of the bottom surface of the battery cell 21 is exposed and bonded and fixed to the bottom plate of the housing assembly 10.

[0029] When using the battery pack of this application, the insulating structure 30 is at least disposed on the bottom surface of the battery cell 21 and covers at least a portion of the battery cell 21 to provide insulation protection for the battery cell 21. Simultaneously, since the insulating structure 30 has an clearance opening 31 corresponding to the bottom surface of the battery cell 21, the portion of the battery cell 21 exposed above the clearance opening 31 can be directly bonded and fixed to the bottom plate of the housing assembly 10 using structural adhesive, thereby improving the shear strength between the battery cell 21 and the bottom plate. Therefore, the battery assembly of this application effectively solves the problem in the prior art where the shear strength of the battery insulating structure and structural adhesive cannot meet the design requirements of the battery pack.

[0030] It should be noted that, in this application, the insulating structure 30 can cover not only at least a portion of the bottom surface of the battery cell 21, but also at least a portion of the circumferential sidewall of the battery cell 21. In other words, the insulating structure 30 can also cover at least a portion of the large surface and at least a portion of the small surface of the battery cell 21, thereby providing insulation protection for the large and small surfaces of the battery cell 21.

[0031] Furthermore, in this application, there may be two or more battery packs 20. When there are two or more battery packs 20, all battery packs 20 are spaced apart along the second direction.

[0032] Meanwhile, in this application, the thickness direction of the battery cell 21 is the first direction, or the direction in which the two large faces of the battery cell 21 are arranged is the first direction; the length direction of the battery cell 21 is the second direction, or the direction in which the two small faces of the battery cell 21 are arranged is the second direction; and the height direction of the battery cell 21 is the third direction, or the height direction of the housing assembly 10 is the third direction. Therefore, in this application, the first direction, the second direction, and the third direction are all perpendicular to each other.

[0033] It should also be noted that in this application, the battery pack 20 may have multiple battery cells 21, and each battery cell 21 is provided with a different insulation structure 30. Furthermore, the number and location of the clearance openings 31 in each insulation structure 30 may be the same or different. Preferably, all battery cells 21 in the same battery pack 20 are provided with the same insulation structure 30, and the number and location of the clearance openings 31 in each insulation structure 30 are the same, thereby facilitating the bonding and fixing of the battery cells.

[0034] Optionally, the bottom plate of the housing assembly 10 is provided with a raised structure 11 corresponding to the clearance opening 31, and the exposed part of the bottom surface of the battery cell 21 is bonded and fixed to the raised structure 11. By providing the raised structure 11, the positioning and bonding of the battery pack 20 and the battery cell 21 can be facilitated. In other words, providing the raised structure 11 on the bottom plate of the housing assembly 10 can play a positioning role in the installation of the battery pack 20, thereby ensuring a more accurate installation between the battery pack 20 and the housing assembly 10.

[0035] Optionally, the battery pack also includes a liquid cooling plate 40, which is disposed on the bottom plate of the housing assembly 10. At least a portion of the liquid cooling plate 40 is disposed around the raised structure 11, and the liquid cooling plate 40 makes thermally conductive contact with the bottom surface of the battery cell 21. That is, in this application, the liquid cooling plate 40 is disposed to avoid the portion of the bottom surface of the battery cell 21 that is exposed by the clearance opening 31, i.e., the liquid cooling plate 40 and the battery cell 21 are in indirect contact through an insulating structure. This arrangement enables effective fixation of the battery cell 21 through direct bonding between the raised structure 11 and the housing of the battery cell 21, thereby ensuring the stability of the bonding and fixation between the battery cell 21 and the housing assembly 10. In addition, in this application, the liquid cooling plate 40 can make thermally conductive contact with the portion of the bottom surface of the battery cell 21 covered by the insulating structure 30, thereby achieving the cooling or heating effect of the liquid cooling plate 40 on the battery pack 20 to ensure the performance of the battery pack 20.

[0036] Optionally, the insulating structure 30 has at least two clearance openings 31 on the bottom surface of the battery cell 21, and all clearance openings 31 are spaced apart along the second direction. By setting multiple clearance openings 31, multi-point fixation of the battery cell 21 can be achieved, improving the fixation effect.

[0037] In one specific embodiment of this application, the insulating structure 30 may have three clearance openings 31 on the bottom surface of the battery cell 21. These three clearance openings 31 are a first opening 311, a second opening 312, and a third opening 313. The first opening 311 and the third opening 313 are respectively located at opposite ends of the bottom surface of the battery cell 21 in a second direction, while the second opening 312 is located between the first opening 311 and the third opening 313. When the insulating structure 30 has two clearance openings 31, it may have two of the first opening 311, the second opening 312, and the third opening 313. Of course, in other embodiments, only one clearance opening 31 may be provided, and the insulating structure 30 may have any one of the first opening 311, the second opening 312, and the third opening 313.

[0038] Specifically, the protruding structure 11 extends along the first direction, and the same protruding structure 11 corresponds to at least one clearance opening 31 of at least one insulating structure 30. Further, the same protruding structure 11 corresponds to at least one clearance opening 31 of each insulating structure 30 in the same battery pack 20, meaning that the same protruding structure 11 can simultaneously fix all battery cells 21 in the same battery pack 20, improving assembly convenience. Of course, in this application, the shape and arrangement of the protruding structure 11 can be adaptively adjusted according to different actual design requirements, as long as the portion of the bottom surface of the battery cell 21 exposed above the clearance opening 31 can be bonded and fixed to the bottom plate of the housing assembly 10 rather than being attached to the liquid cooling plate 40.

[0039] Optionally, the insulating structure 30 has at least two clearance openings 31 on the bottom surface of the battery cell 21, and there are multiple protruding structures 11 spaced apart along the second direction. Each protruding structure 11 corresponds to one clearance opening 31 of each insulating structure 30 in the same battery pack 20. The battery pack also includes a liquid cooling plate 40, at least a portion of which is disposed between adjacent protruding structures 11. Simultaneously, at least a portion of the liquid cooling plate 40 can also be disposed between the protruding structures 11 and the circumferential inner sidewall of the housing assembly 10. This achieves a good heat exchange effect while ensuring a secure fit.

[0040] In this application, when there are multiple protruding structures 11 and these protruding structures 11 are spaced apart along the second direction, the liquid cooling plate 40 is arranged in an arc shape around the space between two adjacent protruding structures 11 and between the protruding structures 11 and the circumferential inner sidewall of the housing assembly 10. This arrangement not only provides stable support for all battery packs 20 through the multiple protruding structures 11, but also ensures the cooling or heating effect of the liquid cooling plate 40 on the battery packs 20. Simultaneously, this arrangement also ensures a better fit between the portion of the bottom surface of the battery cell 21 exposed through the clearance opening 31 and the protruding structure 11.

[0041] It should be noted that, in order to ensure the connectivity of the flow channels in the liquid cooling plate 40, the protruding structure 11 can be provided with an avoidance notch corresponding to the laying path of the liquid cooling plate 40. At this time, if a part of the bottom surface of one of the multiple battery cells 21 in the battery pack 20 is located above the avoidance notch, the bottom surface of the battery cell 21 can also be directly attached to the liquid cooling plate 40.

[0042] Optionally, in the third direction, the height of the protruding structure 11 and the height of the liquid cooling plate 40 between two adjacent protruding structures 11 and between the protruding structure 11 and the circumferential inner sidewall of the housing assembly 10 are the same. This arrangement ensures that the portion of the bottom surface of the battery cell 21 exposed above the clearance opening 31 can be stably attached to the protruding structure 11, and also ensures that the portion of the bottom surface of the battery cell 21 covered by the insulating structure 30 can fully contact the liquid cooling plate 40. In other words, the portions of the protruding structure 11 and the liquid cooling plate 40 that contact the battery pack 20 are approximately on the same plane, thereby ensuring the flatness of the battery pack 20 installation and thus ensuring the stability of the battery pack 20 when it is located inside the housing assembly 10.

[0043] Optionally, a thermally conductive medium layer is provided between the insulating structure 30 and the liquid cooling plate 40. This arrangement can further improve the cooling or heating effect of the liquid cooling plate 40 on the battery pack 20. That is, an adhesive with better adhesion can be provided between the battery cell 21 and the protruding structure 11, while an adhesive with better thermal conductivity can be provided between the liquid cooling plate 40 and the battery cell 21, thereby achieving effective fixation and thermal management at the same time.

[0044] Optionally, the clearance opening 31 has a clearance gap at the periphery of the bottom surface of the battery cell 21. That is, the bottom surface of the battery cell 21 near the edge is provided with an insulating structure 30, and the clearance gap can effectively achieve insulation protection for the battery cell 21.

[0045] In one specific embodiment of this application, at least a portion of the top surface of the battery cell 21 is exposed through a window 32 at the top of the insulating structure 30, and an insulating patch 50 is attached to the top surface of the battery cell 21, with the positive terminal 211 and the negative terminal 212 of the battery cell 21 passing through the insulating patch 50.

[0046] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0047] 1. Effectively solves the problem that the shear strength of the battery insulation structure and structural adhesive in the existing technology cannot meet the design requirements of the battery pack;

[0048] 2. Simple structure and stable performance.

[0049] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0050] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0051] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0052] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: A housing assembly (10) having a receiving cavity; At least one battery pack (20), the battery pack (20) comprising at least one battery cell (21) arranged along a first direction; At least one insulating structure (30) is provided on the outer surface of at least one of the battery cells (21). The insulating structure (30) is provided at least on the bottom surface of the battery cell (21), and the insulating structure (30) is provided with at least one clearance opening (31) corresponding to the bottom surface of the battery cell (21) so that at least a portion of the bottom surface of the battery cell (21) is exposed and bonded and fixed to the bottom plate of the housing assembly (10).

2. The battery pack according to claim 1, characterized in that, The bottom plate of the housing assembly (10) is provided with a protruding structure (11) corresponding to the clearance opening (31), and the exposed part of the bottom surface of the battery cell (21) is bonded and fixed to the protruding structure (11).

3. The battery pack according to claim 2, characterized in that, The battery pack also includes a liquid cooling plate (40), which is disposed on the base plate. At least a portion of the liquid cooling plate (40) is disposed around the protruding structure (11), and the liquid cooling plate (40) is in thermal contact with the bottom surface of the battery cell (21).

4. The battery pack according to claim 2, characterized in that, The insulating structure (30) has at least two clearance openings (31) spaced apart along the second direction on the bottom surface of the battery cell (21), and the first direction and the second direction are perpendicular to each other.

5. The battery pack according to claim 4, characterized in that, The protruding structure (11) extends along the first direction, and the same protruding structure (11) corresponds to at least one of the clearance openings (31) of each of the insulating structures (30) in the same battery pack (20).

6. The battery pack according to claim 5, characterized in that, There are multiple protrusions (11), and the multiple protrusions (11) are spaced apart along the second direction. The same protrusion (11) corresponds to one of the clearance openings (31) of each of the insulating structures (30) in the same battery pack (20).

7. The battery pack according to claim 6, characterized in that, The battery pack also includes a liquid cooling plate (40) disposed on the base plate. At least a portion of the liquid cooling plate (40) is disposed between adjacent protrusions (11) and / or between the protrusions (11) and the circumferential inner sidewall of the housing assembly (10), and the liquid cooling plate (40) is in thermal contact with the bottom surface of the battery cell (21).

8. The battery pack according to claim 7, characterized in that, In the third direction, the height of the protruding structure (11) and the height of the liquid cooling plate (40) located between two adjacent protruding structures (11) and / or between the protruding structure (11) and the circumferential inner sidewall of the housing assembly (10) are the same, and the first direction, the second direction and the third direction are mutually perpendicular.

9. The battery pack according to claim 3 or 7, characterized in that, A thermally conductive medium layer is present between the insulating structure (30) and the liquid cooling plate (40).

10. The battery pack according to claim 1, characterized in that, The clearance opening (31) has a clearance gap corresponding to the periphery of the bottom surface of the battery cell (21).

Images