Battery pack

Abstract

The utility model provides a kind of battery pack, it is related to battery pack structure technical field, for solving the problem of low overall air tightness of battery pack caused by the insufficient rigidity and strength of the upper cover of battery pack in relevant technology and the insufficient connecting strength of upper cover and bottom shell;The battery pack comprises: bottom shell, electric core and upper cover, upper cover is sealedly connected with the opening of bottom shell, and electric core is arranged in bottom shell;The inner surface of upper cover and the upper surface of electric core are opposite, the inner surface has a plurality of interval arrangement reinforcing ribs, the upper surface has a plurality of accommodating grooves, and each reinforcing rib is arranged in corresponding accommodating groove;The contact surface of reinforcing rib and accommodating groove is further provided with adhesive layer.Reinforcing rib is used to increase the strength and rigidity, accommodating groove provides space for reinforcing rib, avoids reinforcing rib to occupy too much battery pack thickness space, reduces the overall thickness of battery pack;Adhesive layer is used to improve the connecting strength of reinforcing rib and accommodating groove, and the air tightness of sealing cavity is enhanced.

Description

Technical Field

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

[0002] As the source of power for electric vehicles, the power battery is a crucial factor affecting the key performance of new energy vehicles. The battery pack consists of an upper cover and a lower housing, with the battery cells housed within a sealed cavity formed by the sealed connection between the upper and lower housings. The upper cover, as a protective component of the battery pack, needs a certain degree of rigidity and strength to withstand vibration, impact, and collisions. Simultaneously, the upper cover also serves as the seal for the battery pack, requiring a certain connection strength between the upper cover and the lower housing to ensure the airtightness of the battery pack.

[0003] In related technologies, reinforcing embossing on the top cover improves its strength and rigidity; however, simply adding reinforcing embossing cannot ensure the connection strength between the top cover and the lower casing. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack that improves the rigidity and strength of the battery pack cover while ensuring the connection strength between the cover and the bottom shell, thereby improving the overall airtightness of the battery pack.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a battery pack, comprising: a bottom shell with an opening; and a battery cell disposed within the bottom shell; a top cover sealed to the opening; along the thickness direction of the battery cell, the inner surface of the top cover and the upper surface of the battery cell are opposite to each other, the inner surface having a plurality of spaced reinforcing ribs, and the upper surface having a plurality of receiving grooves, each reinforcing rib being disposed within a corresponding receiving groove; the contact surface between the reinforcing rib and the receiving groove is further provided with an adhesive layer.

[0007] In one embodiment of this invention, a plurality of reinforcing ribs are arranged at equal intervals along the width direction of the battery cell, and the length of the reinforcing ribs is equal to the length of the battery cell along the length direction of the battery cell.

[0008] In one embodiment of this invention, the height of the reinforcing rib is less than or equal to the depth of the connecting groove along the thickness direction of the battery cell.

[0009] In one embodiment of this invention, a portion of the adhesive layer extends beyond the contact surface between the reinforcing rib and the receiving groove.

[0010] In one embodiment of this utility model, the upper cover includes a top plate and side peripheral walls surrounding the top plate; along the thickness direction of the cover, the width of the side peripheral walls is greater than or equal to the height of the reinforcing ribs.

[0011] In one embodiment of this utility model, the side peripheral wall has a mounting flange, which is sealed to the opening; the thickness of the mounting flange is greater than the thickness of the top plate and the side peripheral wall.

[0012] In one embodiment of this invention, the connection area between the side wall and the top plate is provided with an arc-shaped corner.

[0013] In one embodiment of this utility model, the battery cell includes a plurality of sub-cells arranged adjacent to each other along the width direction of the battery cell, and the adjacent edges of two adjacent sub-cells are respectively provided with protrusions to form the receiving groove at the adjacent junction of two adjacent sub-cells.

[0014] In one embodiment of this invention, the top cover is made of fiber-reinforced composite material and is integrally molded.

[0015] In one embodiment of this invention, the resin matrix in the fiber-reinforced composite material includes one or more of polyamide, polycarbonate, polyetheretherketone, polyurethane, or polypropylene; and / or, the fiber reinforcement in the fiber-reinforced composite material includes one or more of short glass fibers, long glass fibers, or continuous fibers; and / or, the molding process of the top cover includes: sheet molding compound molding, prepreg molding, resin injection molding, long fiber thermoplastic molding, glass fiber mat reinforced thermoplastic sheet molding, or fiber winding molding.

[0016] The beneficial effects of the battery pack provided by this utility model are as follows:

[0017] The reinforcing ribs increase the strength and rigidity of the top cover, thereby improving its impact resistance. The receiving groove provides a clearance area for the reinforcing ribs, preventing the ribs from taking up too much space in the battery pack thickness. This increases the strength and rigidity of the top cover while reducing the overall thickness of the battery pack. The adhesive layer improves the connection strength between the reinforcing ribs and the receiving groove, thereby improving the connection strength between the top cover and the battery cells. When the top cover is assembled with the bottom shell, it greatly enhances the airtightness of the sealing cavity. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A perspective view of the top cover of the battery pack provided in an embodiment of this application;

[0020] Figure 2 A cross-sectional view of the top cover of the battery pack provided in an embodiment of this application along the width direction of the battery pack;

[0021] Figure 3 This is a perspective view of the battery pack provided in an embodiment of this application;

[0022] Figure 4 A cross-sectional view of the battery pack along its width direction provided in an embodiment of this application.

[0023] Figure label:

[0024] 100 - Bottom shell;

[0025] 200-cell;

[0026] 201 - Upper surface; 202 - Receiving groove; 203 - Sub-cell;

[0027] 2031 - Protrusion;

[0028] 300 - Top Cover;

[0029] 301-Inner surface; 302-Reinforcing rib; 303-Top plate; 304-Side wall; 305-Installation flange; 306-Curved corner. Detailed Implementation

[0030] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0031] In this embodiment, the thickness direction of the battery pack and the battery cell is the z-axis shown in the figure; the length direction of the battery pack and the battery cell is the x-axis shown in the figure; and the width direction of the battery pack and the battery cell is the y-axis shown in the figure.

[0032] refer to Figures 1-4 The battery pack provided in this application embodiment includes a bottom shell 100 with an opening.

[0033] It also includes a top cover 300, which is sealed to the opening to form a sealed cavity within the bottom shell 100.

[0034] It also includes a battery cell 200, which is disposed inside a sealed cavity.

[0035] Along the thickness direction of the cell 200 (z-axis shown in the figure), the top cover 300 has an inner surface 301 facing the sealing cavity.

[0036] Along the thickness direction of the cell 200 (z-axis shown in the figure), the cell 200 has an upper surface 201, which is opposite to the inner surface 301.

[0037] The inner surface 301 has a plurality of spaced reinforcing ribs 302, which are used to increase the strength and rigidity of the cover 300, thereby improving the impact resistance of the cover 300.

[0038] The upper surface 201 has multiple receiving grooves 202, and the positions of the receiving grooves 202 correspond to the reinforcing ribs 302, so that each reinforcing rib 302 is respectively set in a corresponding receiving groove 202.

[0039] The receiving groove 202 provides a clearance area for the reinforcing rib 302, avoiding the rib 302's protrusion height from occupying too much of the battery pack's thickness space. This increases the strength and rigidity of the top cover 300 while reducing the overall thickness of the battery pack.

[0040] Furthermore, an adhesive layer is provided on the contact surface between the reinforcing rib 302 and the receiving groove 202; that is, an adhesive layer is also provided between the top cover 300 and the battery cell 200.

[0041] The adhesive layer is used to improve the connection strength between the reinforcing rib 302 and the receiving groove 202, thereby improving the connection strength between the top cover 300 and the battery cell 200; when the top cover 300 is assembled with the bottom shell 100, it greatly enhances the airtightness of the sealing cavity.

[0042] In this embodiment, the shape and size of the receiving groove 202 are adapted to the reinforcing rib 302 so that the reinforcing rib 302 is fitted into the receiving groove 202; this further improves the connection strength between the reinforcing rib 302 and the receiving groove 202, thereby further improving the connection strength between the top cover 300 and the battery cell 200.

[0043] In this embodiment, the contact surfaces of the reinforcing rib 302 and the receiving groove 202 are all covered with an adhesive layer to improve the bonding effect.

[0044] The receiving groove 202 includes a groove bottom and an inner sidewall. The outer peripheral wall of the reinforcing rib 302 contacts the groove bottom to form a first contact surface. At the same time, the outer peripheral wall of the reinforcing rib 302 also contacts the inner sidewall to form a second contact surface. Both the first and second contact surfaces are provided with an adhesive layer.

[0045] Continue to refer to Figure 1 In this embodiment of the application, the reinforcing rib 302 can be a rectangular protrusion. The rectangular protrusion has a top surface and two side walls connected to the top surface. The top surface is in contact with the bottom of the groove, and the two side walls are in contact with the inner side wall of the groove.

[0046] The connection between the top surface and the side wall also has a rounded chamfer to prevent the rectangular protrusion from being too sharp and damaging the battery cell 200.

[0047] In this embodiment, part of the adhesive layer extends beyond the contact surface between the reinforcing rib 302 and the receiving groove 202; that is, the adhesive layer overflows from the connection between the reinforcing rib 302 and the receiving groove 202, further improving the bonding effect.

[0048] It should be noted that adhesive is first applied to the receiving groove 202, and then the cover 300 is assembled. When assembling the cover 300, the reinforcing rib 302 is fitted into the receiving groove 202. During the fitting process, the adhesive is squeezed, and some adhesive will overflow from the connection between the reinforcing rib 302 and the receiving groove 202.

[0049] refer to Figure 1 In this embodiment of the application, multiple reinforcing ribs 302 are arranged at equal intervals along the width direction of the battery cell 200 (y-axis shown in the figure), so that the multiple reinforcing ribs 302 are evenly distributed on the inner surface 301 of the top cover 300. When the top cover 300 is impacted, the impact force can be evenly dispersed. The evenly distributed reinforcing ribs 302 can also ensure that the surface of the assembled top cover 300 is completely flat, which is more conducive to improving integration efficiency.

[0050] At the same time, along the length direction of the battery cell 200 (x-axis shown in the figure), the length of the reinforcing rib 302 is equal to the length of the battery cell 200; the longer the reinforcing rib 302 is, the better it can ensure the strength and rigidity of the top cover 300.

[0051] In this embodiment of the application, along the thickness direction of the battery cell 200 (the z-axis shown in the figure), the height of the reinforcing rib 302 is less than or equal to the groove depth of the connecting groove 202.

[0052] To prevent the reinforcing rib 302 from protruding beyond the receiving groove 202 when it is fitted into the receiving groove 202, it is necessary to further prevent the protrusion height of the reinforcing rib 302 from occupying too much of the thickness space of the battery pack and reducing the overall thickness of the battery pack.

[0053] refer to Figure 2 In this embodiment of the application, the upper cover 300 includes a top plate 303 and a side wall 304 surrounding the top plate 303 to form a certain accommodating cavity in the upper cover 300. The reinforcing rib 302 protruding from the inner surface 301 is located in the accommodating cavity, further improving the overall modality of the upper cover 300.

[0054] Along the thickness direction of the cell 200 (z-axis shown in the figure), the width of the side peripheral wall 304 is greater than or equal to the height of the reinforcing rib 302, so as to prevent the reinforcing rib 302 from protruding out of the above-mentioned accommodating cavity.

[0055] refer to Figure 4 In this embodiment of the application, the connection area between the side wall 304 and the top plate 303 is provided with an arc-shaped corner 306.

[0056] The curved corner 306 makes the boundary between the side wall 304 and the top plate 303 smoothly transition, avoiding excessive bending at the connection between the side wall 304 and the top plate 303, which would easily lead to breakage. This improves the connection strength between the side wall 304 and the top plate 303, prevents gaps from forming in the connection area between the side wall 304 and the top plate 303, thus avoiding affecting the sealing effect and further ensuring the airtightness of the sealing cavity.

[0057] refer to Figure 2 and Figure 3 In this embodiment of the application, the end of the side wall 304 away from the top plate 303 also has a mounting flange 305, which is sealed to the opening.

[0058] Installing the flange 305 increases the contact area between the top cover 300 and the opening, thereby improving the sealing strength at the connection between the top cover 300 and the opening and ensuring the airtightness of the sealed cavity.

[0059] Meanwhile, the thickness of the top plate 303 is the same as the thickness of the side wall 304, and the thickness of the mounting flange 305 is greater than the thickness of the top plate 303 and the side wall 304.

[0060] The thickened installation flange 305 enhances the strength of the installation flange 305, thereby increasing the strength of the sealing surface between the top cover 300 and the opening, and further ensuring the airtightness of the sealing cavity.

[0061] refer to Figure 1 and Figure 4 In this embodiment of the application, the battery cell 200 may include a plurality of sub-cells 203 arranged adjacent to each other along the width direction (y-axis shown in the figure) of the battery cell 200. The adjacent edges of two adjacent sub-cells 203 are respectively provided with protrusions 2031 to form a receiving groove 202 at the adjacent junction of two adjacent sub-cells 203.

[0062] In other words, a reinforcing rib 302 is provided between the two sub-cells 203.

[0063] In this embodiment, an adhesive layer is also provided on the contact surface between the mounting flange 305 and the opening. Part of the adhesive layer extends beyond the contact surface between the mounting flange 305 and the opening and is exposed outside the battery pack.

[0064] The adhesive exposed on the outside of the battery pack prevents external moisture from entering the battery pack through the gap between the mounting flange 305 and the opening.

[0065] In this embodiment, the top cover 300 is made of fiber-reinforced composite material.

[0066] Fiber-reinforced composite materials have more reliable insulation properties, and the low density and weight of the composite materials can reduce the weight of the top cover by 300, thereby achieving the goal of reducing the weight of the battery pack.

[0067] In the embodiments of this application, the resin matrix in the fiber-reinforced composite material includes, but is not limited to, one or more of polyamide, polycarbonate, polyetheretherketone, polyurethane, or polypropylene.

[0068] The fiber reinforcements in fiber-reinforced composites include, but are not limited to, one or more of short glass fibers, long glass fibers, or continuous fibers.

[0069] Meanwhile, the top cover is 300mm integrally molded.

[0070] Compared to bonding and welding, one-piece molding ensures that the overall rigidity and strength of the top cover 300 are not affected by the joint surface, and the production speed is faster, which is conducive to ensuring mass production efficiency.

[0071] The molding process of the top cover 300 includes, but is not limited to, one of the following: sheet molding compound molding, prepreg molding, resin injection molding, long fiber thermoplastic molding, glass fiber mat reinforced thermoplastic sheet molding, or fiber winding molding.

[0072] In summary, this application provides a battery pack comprising: a bottom shell 100, a battery cell 200, and a top cover 300. The top cover 300 is sealed to the opening of the bottom shell 100, and the battery cell 200 is disposed within the bottom shell 100. Along the thickness direction of the battery cell 200, the inner surface 301 of the top cover 300 and the upper surface 201 of the battery cell 200 are opposite to each other. The inner surface 301 has a plurality of spaced reinforcing ribs 302, and the upper surface 201 has a plurality of receiving grooves 202. Each reinforcing rib 302 is disposed within a corresponding receiving groove 202. An adhesive layer is also provided on the contact surface between the reinforcing rib 302 and the receiving groove 202.

[0073] The reinforcing rib 302 is used to increase the strength and rigidity of the top cover 300, thereby improving the impact resistance of the top cover 300; the receiving groove 202 provides a clearance area for the reinforcing rib 302, avoiding the rib 302's protrusion height from occupying too much of the battery pack's thickness space, thus reducing the overall thickness of the battery pack while increasing the strength and rigidity of the top cover 300; the adhesive layer is used to improve the connection strength between the reinforcing rib 302 and the receiving groove 202, thereby improving the connection strength between the top cover 300 and the battery cell 200; when the top cover 300 is assembled with the bottom shell 100, it greatly enhances the airtightness of the sealing cavity.

[0074] The various embodiments or embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other.

[0075] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0076] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0077] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0078] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized by, include: A bottom shell with an opening (100). as well as A battery cell (200) is disposed within the bottom casing (100); The upper cover (300) is sealed to the opening; Along the thickness direction of the battery cell (200), the inner surface (301) of the upper cover (300) and the upper surface (201) of the battery cell (200) are opposite to each other. The inner surface (301) has a plurality of spaced reinforcing ribs (302), and the upper surface (201) has a plurality of receiving grooves (202). Each reinforcing rib (302) is respectively disposed in a corresponding receiving groove (202). The contact surface between the reinforcing rib (302) and the receiving groove (202) is also provided with an adhesive layer.

2. The battery pack according to claim 1, characterized in that, The multiple reinforcing ribs (302) are arranged at equal intervals along the width direction of the battery cell (200), and the length of the reinforcing ribs (302) is equal to the length of the battery cell (200) along the length direction of the battery cell (200).

3. The battery pack according to claim 1, characterized in that, Along the thickness direction of the battery cell (200), the height of the reinforcing rib (302) is less than or equal to the depth of the receiving groove (202).

4. The battery pack according to claim 1, characterized in that, Part of the adhesive layer extends beyond the contact surface between the reinforcing rib (302) and the receiving groove (202).

5. The battery pack according to claim 1, characterized in that, The top cover (300) includes a top plate (303) and side walls (304) surrounding the top plate (303). Along the thickness direction of the battery cell (200), the width of the side peripheral wall (304) is greater than or equal to the height of the reinforcing rib (302).

6. The battery pack according to claim 5, characterized in that, The side wall (304) has a mounting flange (305), which is sealed to the opening; The thickness of the mounting flange (305) is greater than the thickness of the top plate (303) and the side peripheral wall (304).

7. The battery pack according to claim 5, characterized in that, The connection area between the side wall (304) and the top plate (303) is provided with an arc-shaped corner (306).

8. The battery pack according to claim 1, characterized in that, The battery cell (200) includes a plurality of sub-cells (203) arranged adjacent to each other along the width direction of the battery cell (200). The adjacent edges of two adjacent sub-cells (203) are respectively provided with protrusions (2031) to form the receiving groove (202) at the adjacent location of two adjacent sub-cells (203).

9. The battery pack according to claim 1, characterized in that, The top cover (300) is made of fiber-reinforced composite material and is integrally formed.

10. The battery pack according to claim 9, characterized in that, The resin matrix in the fiber-reinforced composite material includes one or more of polyamide, polycarbonate, polyetheretherketone, polyurethane, or polypropylene; and / or, The fiber reinforcement in the fiber-reinforced composite material includes one or more of short glass fibers, long glass fibers, or continuous fibers; and / or, The molding process of the top cover (300) includes: sheet molding, prepreg molding, resin injection molding, long fiber thermoplastic molding, glass fiber felt reinforced thermoplastic sheet molding, or fiber winding molding.

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