CN216054924U - Battery box and battery package - Google Patents

Abstract

The utility model provides a battery box body which comprises a metal matrix and a plastic matrix, wherein the battery box body is formed by compounding the plastic matrix and the metal matrix. The metal matrix is provided with lightening holes for lightening, and the plastic matrix at least covers the lightening holes. The battery box body is formed by compounding the plastic matrix and the metal matrix, so that the weight of the battery box body can be reduced, the energy density of a battery pack can be improved, and the strength and the sealing performance of the battery box body can be ensured. The utility model also provides a battery pack.

Description

Battery box and battery package

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery box body and a battery pack.

Background

With the development of electronic technology, lithium ion batteries have the advantages of high specific power, long cycle life, good safety performance, no pollution and the like, so that the lithium ion batteries are widely applied, and meanwhile, people have higher and higher pursuits on energy density of the batteries.

In order to improve the energy density of the battery pack, the weight of the battery pack is generally reduced by adopting a weight reduction mode at present, namely, the weight of the battery pack is reduced by adopting a mode of arranging a battery box body into a frame structure and/or arranging weight reduction holes on the battery box body, and the like, so that the energy density is improved. However, in the conventional light-weight battery case structure, since only the frame structure is adopted and the lightening holes are formed, the overall strength and the sealing performance of the battery case may be reduced. Especially, in terms of sealing performance, the frame structure, lightening holes and other complex structures can enable the battery box body to have a plurality of permeable and breathable gaps, through holes or through grooves, so that the sealing performance and the general usability of the battery box body are reduced, and risks of corrosion, electric leakage and the like which affect the service life and safety are caused. Meanwhile, the battery box body adopting the frame structure at present is lack of a structure for fixedly mounting the battery module (or the battery core), so that the mounting stability of the battery module (or the battery core) in the battery box body can be influenced.

Disclosure of Invention

The utility model aims to provide a battery box body and a battery pack, aiming at solving the defects of the prior art, the battery box body is formed by compounding a plastic matrix and a metal matrix, so that the weight of the battery box body can be reduced, the energy density can be improved, and the strength and the sealing performance of the battery box body can be ensured.

One embodiment of the utility model provides a battery box body, which is formed by compounding a metal matrix and a plastic matrix, wherein the plastic matrix at least partially covers the surface of the metal matrix. The metal matrix is provided with lightening holes for lightening, and the plastic matrix at least covers the lightening holes.

In an implementable manner, the plastic matrix is formed on the metal matrix by an injection molding process, the plastic matrix covering the entire surface of the metal matrix. The case where the plastic base covers the entire surface of the metal base includes: the plastic matrix covers the whole inner surface and/or outer surface of the metal matrix; the case where the plastic substrate entirely covers the metal substrate is also included.

In an implementation manner, the metal base body comprises a top beam, a cross beam and a longitudinal beam, the top beam is of an annular structure, the cross beam and the longitudinal beam are both of a U-shaped structure, the cross beam and the longitudinal beam are arranged in a mutually crossed manner, and two ends of the cross beam and two ends of the longitudinal beam are respectively connected with the top beam; the weight reduction holes are formed between the cross beam and the longitudinal beam and/or between the cross beam, the longitudinal beam and the top beam.

In an implementation manner, the number of the cross beams and the number of the longitudinal beams are multiple, the cross beams are arranged at intervals along the front-back direction of the battery box body, and the longitudinal beams are arranged at intervals along the left-right direction of the battery box body.

In an implementable manner, the transverse beams and the longitudinal beams are provided with stiffening projections.

In an implementation manner, the metal base further includes a connecting plate, the connecting plate is disposed on one side inside the battery box body, the connecting plate is provided with a connecting portion, and the connecting plate is further provided with a weight reduction port for reducing weight.

In an implementation manner, the metal base further includes a front panel, the front panel is disposed on one side of the battery box body in the front-back direction of the battery box body, and the front panel is provided with a plug-in hole.

In an implementable manner, the front panel is further provided with a plurality of through holes, and the plastic substrate covers the through holes.

In an implementation manner, the metal base further includes a fixing beam, the fixing beam is disposed on at least one side outside the battery box, and a reinforcing portion for reinforcing is disposed on the fixing beam.

Another embodiment of the utility model further provides a battery pack, which comprises the battery box body.

According to the battery box body provided by the utility model, the battery box body is formed by compounding the plastic base body and the metal base body, and the density of the plastic base body is far lower than that of metal, so that the weight of the battery box body is greatly reduced compared with that of the traditional metal box body, the light weight of the battery box body is realized, and the energy density of a battery pack is improved. Meanwhile, the metal matrix can bear main stress and impact force, the plastic matrix can bear secondary stress and impact force, and the plastic matrix can absorb vibration, so that the overall strength of the battery box body meets the design and use requirements. Moreover, due to the insulating property of the plastic substrate, the electric gap between the electric connecting part inside the battery box body and the battery box body can be reduced, and the electric protection level is improved, so that the internal structure of the battery pack system is optimized. Meanwhile, the plastic base body covers the surface of the metal base body and seals the metal base body, so that the sealing performance of the battery box body can be guaranteed, most of the metal base body can be isolated from contacting with air, and the metal base body is effectively prevented from being corroded and damaged.

Drawings

Fig. 1 is a schematic perspective view of a battery case according to an embodiment of the present invention.

Fig. 2 is an exploded view of the structure of fig. 1.

Fig. 3 is a schematic structural view of the cross beam in fig. 2.

Fig. 4 is a schematic structural view of the longitudinal beam in fig. 2.

Fig. 5 is a schematic structural view of the connection plate in fig. 2.

Fig. 6 is a schematic structural view of the front panel in fig. 2.

Fig. 7 is a structural schematic view of the fixing beam in fig. 2.

Fig. 8 is a schematic perspective view of a battery pack according to an embodiment of the present invention.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

The terms "first," "second," "third," "fourth," and the like in the description and in the claims, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The terms of orientation, up, down, left, right, front, back, top, bottom, and the like (if any) referred to in the specification and claims of the present invention are defined by the positions of structures in the drawings and the positions of the structures relative to each other, only for the sake of clarity and convenience in describing the technical solutions. It is to be understood that the use of the directional terms should not be taken to limit the scope of the utility model as claimed.

As shown in fig. 1 and fig. 2, the battery box provided in the embodiment of the present invention is used for accommodating a battery module 3 (or a battery core, please refer to fig. 8 for a specific structure of the battery module 3). The battery box body comprises a metal matrix 1 and a plastic matrix 2, and is formed by compounding the plastic matrix 2 and the metal matrix 1. The plastic matrix 2 at least partially covers the surface of the metal matrix 1, and the plastic matrix 2 seals the pores of the metal matrix 1 and seals and insulates the unsealed pores of the metal matrix 1.

Specifically, since the density of the plastic base 2 is much lower than that of metal, the weight of the battery case is greatly reduced (the weight can be reduced by at least about 1/3) compared with that of a conventional metal case, so that the weight of the battery case is reduced, and the energy density of the battery pack is improved. Meanwhile, the metal matrix 1 can bear main stress and impact force, the plastic matrix 2 can bear secondary stress and impact force, and the plastic matrix 2 can absorb vibration, so that the overall strength of the battery box body meets the design and use requirements. Moreover, due to the insulating property of the plastic substrate 2, the electrical gap between the electrical connection part inside the battery case and the battery case can be reduced, and the electrical protection level can be improved, so that the internal structure of the battery pack system can be optimized.

As shown in fig. 2, as an embodiment, the metal matrix 1 is provided with lightening holes 11 for lightening, and the plastic matrix 2 covers at least the lightening holes 11 (i.e. seals the lightening holes 11).

As shown in fig. 2, the entire metal base 1 is formed by screwing, welding, riveting, or die casting, as an embodiment, and can withstand various stresses and impact forces to which the battery case is subjected. The metal matrix 1 comprises a top beam 12, a cross beam 13 and a longitudinal beam 14, wherein the top beam 12 is of an annular structure (specifically, a square annular structure), and the cross beam 13 and the longitudinal beam 14 are both of U-shaped structures. The top beam 12 is connected with the box cover in a sealing way by riveting, crimping, screwing or welding. The cross beam 13 and the longitudinal beam 14 are arranged in a mutually crossed manner, and both ends of the cross beam 13 and both ends of the longitudinal beam 14 are respectively connected with the top beam 12. Specifically, both ends of the cross beam 13 are connected to the left and right ends of the top beam 12, respectively, and both ends of the longitudinal beam 14 are connected to the front and rear ends of the top beam 12, respectively. The cross beams 13 and the top beams 12 and the longitudinal beams 14 and the top beams 12 may be fixed by screwing, welding or riveting.

As shown in fig. 2, in one embodiment, the number of the cross members 13 and the number of the longitudinal members 14 are plural, the plural cross members 13 are arranged at intervals in the front-rear direction X of the battery case, and the plural longitudinal members 14 are arranged at intervals in the left-right direction Y of the battery case. The crossed positions of the cross beams 13 and the longitudinal beams 14 are fixed by screwing, welding or riveting to form a grid-shaped framework structure, so that the overall strength of the battery box body is improved. The number of the lightening holes 11 is multiple, and the lightening holes 11 are enclosed between two adjacent cross beams 13 and two adjacent longitudinal beams 14 and between the cross beams 13, the longitudinal beams 14 and the top beam 12.

As shown in fig. 3 and 4, as an embodiment, the cross beam 13 and the longitudinal beam 14 are provided with a protrusion 10 for reinforcing, the protrusion 10 is formed by stamping, and the protrusion 10 protrudes outward from the cross beam 13 and the longitudinal beam 14.

As shown in fig. 2 and 5, as an embodiment, the metal base 1 further includes a connection plate 15, the connection plate 15 is disposed on one side (or multiple sides) in the battery box, and the connection plate 15 is fixed to the plurality of cross beams 13 by screwing, welding, or riveting (of course, the connection plate 15 may also be fixed to the plurality of longitudinal beams 14), and can play a certain role in reinforcement. The connecting plate 15 is provided with a thin-wall convex connecting portion 151, and the connecting portion 151 is used for fixing the battery module 3 (or the battery cell) in the battery box.

Specifically, the thin-wall convex connecting portion 151 can play a role in reducing weight and also can play a role in improving the installation stability of the battery module 3 (or the battery cell). The connecting portion 151 may be fixed to the connecting plate 15 by stamping or welding, and the battery module 3 (or the battery core) and the connecting portion 151 may be fixed to each other by screwing or welding or by clamping. The connection plate 15 and the connection portion 151 can ensure reliable mounting and fixing of the battery module 3 (or the battery cell).

As shown in fig. 5, as an embodiment, the connecting plate 15 is provided with a lightening hole 152 for lightening, the lightening hole 152 is formed by recessing the side edge of the connecting plate 15, and the lightening hole 152 may be a lightening structure such as a groove, a hole, etc.

As shown in fig. 2 and 6, according to one embodiment, the metal base 1 further includes a front panel 16, the front panel 16 is provided on one side of the battery case in the front-rear direction X of the battery case (in the present embodiment, the front panel 16 is provided on the front side of the battery case), and the front panel 16 is provided with a plug-in hole 161. In the present embodiment, the number of the insert holes 161 is three.

Specifically, the front panel 16 is disposed inside the battery case (of course, the front panel 16 may be disposed outside the battery case), and the front panel 16 is fixed to the side members 14 by screwing, welding, or riveting (of course, the front panel 16 may be fixed to the cross member 13). The plug-in holes 161 on the front panel 16 are mainly used for installing high-voltage and low-voltage plug-ins, are simple and reliable to install, and can ensure communication and electric connection between the inside and the outside of the battery system.

As shown in fig. 2 and 6, as an embodiment, the front panel 16 is further provided with a plurality of through holes 162, the plastic substrate 2 covers the through holes 162, and the through holes 162 have the same function and opening manner as the lightening holes 11, that is, the through holes 162 not only can play a role of lightening, but also can improve the composite effect of the plastic substrate 2 and the metal substrate 1.

As shown in fig. 2 and 7, as an embodiment, the metal base 1 further includes fixing beams 17, the fixing beams 17 are disposed on opposite sides outside the battery case (of course, the fixing beams 17 may be disposed on one side or two asymmetric sides of the battery case), and the fixing beams 17 are fixed to the plurality of cross beams 13 by screwing, welding, or riveting (of course, the fixing beams 17 may be fixed to the plurality of longitudinal beams 14). The fixing beam 17 is provided with a mounting hole 172, and the mounting hole 172 is used for connecting with an external frame to realize the mounting and fixing of the battery box body. The fixed beam 17 can ensure the reliable fixed connection of the battery box body and the external frame.

As shown in fig. 7, as an embodiment, a reinforcing portion 171 for reinforcing is provided on the fixing beam 17, and the reinforcing portion 171 may be formed by punching. The reinforcing part 171 corresponds to the protrusion 10 on the cross beam 13 or the longitudinal beam 14, and can present a mounting state of a sleeved and embedded state as shown in fig. 2 and 8 during mounting, so that the mounting convenience and the mounting precision of the whole battery box body are improved.

As shown in fig. 1 and 2, as an embodiment, the plastic substrate 2 is formed on the metal substrate 1 by an injection molding process, that is, the entire plastic substrate 2 is integrally formed by the injection molding process, and the plastic substrate 2 and the metal substrate 1 are formed as an integral structure.

As shown in fig. 1 and 2, as an embodiment, the plastic substrate 2 covers the entire surface of the metal substrate 1, which not only ensures the sealing performance of the battery case, but also isolates the metal substrate 1 from air, thereby effectively preventing the metal substrate 1 from corrosion damage (of course, the plastic substrate 2 may only cover the lightening holes 11, the through holes 162, and the pores between the parts of the metal substrate 1 to achieve the sealing effect).

Specifically, after the metal base 1 is assembled, plastic is filled into the surface and the gaps (such as the lightening holes 11, the through holes 162 and the like) of the metal base 1 through an injection molding process, so that the whole battery case is formed into a closed container (of course, the positions of the plug-in holes 161, the mounting holes 172 and the like need to remain the gaps, that is, the positions of the plug-in holes 161, the mounting holes 172 and the like are not filled with the plastic). Generally, besides the lightening holes 11 and the through holes 162 of the metal base 1 being non-sealing structures, there are many gaps (such as spaces between the cross beams 13 and the longitudinal beams 14 which are staggered with each other), if the plastic base 2 is fixed on the metal base 1 by a common method (such as adhesion, screwing, etc.), the gaps of the metal base 1 cannot be completely sealed, and there is also a gap at the joint of the plastic base 2 and the metal base 1, so that the sealing effect of the battery case cannot be completely ensured. In the embodiment, the plastic substrate 2 and the metal substrate 1 are compounded into a whole by using an injection molding process, that is, the plastic substrate 2 at least wraps and covers the space to be sealed, so that the metal substrate 1 is wrapped, and not only the lightening holes 11 and the gaps on the metal substrate 1 can be completely sealed, thereby ensuring the sealing effect of the battery box body, but also ensuring the consistency of the battery box body (the plastic substrate 2 and the metal substrate 1 form an integrated structure), so that the processing treatment of sealing and insulating the gaps of the battery box body is reduced, and the production cost of the battery box body is effectively reduced.

As shown in fig. 8, an embodiment of the present invention further provides a battery pack, which includes the above-mentioned battery box, and the battery pack further includes a box cover (not shown) and a battery module 3 (or an electrical core), where the box cover and the battery box are fastened and hermetically connected, and the battery module 3 (or the electrical core) is fixedly disposed in the battery box.

The battery box provided by the embodiment of the utility model has the advantages that:

1. the battery box body is formed by compounding the plastic base body 2 and the metal base body 1, and the density of the plastic base body 2 is far lower than that of metal, so that the weight of the battery box body is greatly reduced (the weight of the battery box body can be reduced by about 1/3 at least) compared with that of a traditional metal box body, the weight of the battery box body is reduced, and the energy density of a battery pack is improved.

2. The metal base body 1 can bear main stress and impact force, the plastic base body 2 can bear secondary stress and impact force, and the plastic base body 2 can absorb vibration, so that the overall strength of the battery box body meets the design and use requirements.

3. Due to the insulating property of the plastic base body 2, the electric gap between the electric connecting part inside the battery box body and the battery box body can be reduced, and the electric protection level is improved, so that the internal structure of the battery pack system is optimized.

4. Because plastic substrate 2 covers the surface of metal substrate 1 and seals metal substrate 1, not only can guarantee the sealing performance of battery box, make the battery package satisfy IP68 waterproof dustproof requirement, can also completely cut off the contact of most metal substrate 1 and air to effectively prevent the corrosion damage of metal substrate 1.

5. The plastic base body 2 is formed on the metal base body 1 through the injection molding process, namely the whole plastic base body 2 is integrally formed through the injection molding process, and the plastic base body 2 and the metal base body 1 form an integrated structure, so that the sealing effect of the battery box body can be ensured, the consistency of the battery box body can be ensured, the follow-up processing of the battery box body is reduced, and the production cost of the battery box body is effectively reduced.

6. Be equipped with connecting plate 15 in the battery box, be equipped with connecting portion 151 on the connecting plate 15, connecting plate 15 and connecting portion 151 can guarantee that the reliable installation of battery module 3 (or electric core) is fixed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. The battery box body is characterized by being formed by compounding a metal matrix (1) and a plastic matrix (2), wherein lightening holes (11) playing a lightening role are formed in the metal matrix (1), and the plastic matrix (2) at least covers the lightening holes (11).

2. The battery case according to claim 1, wherein the plastic substrate (2) is formed on the metal substrate (1) by an injection molding process, and the plastic substrate (2) covers the entire surface of the metal substrate (1).

3. The battery box body according to claim 1, characterized in that the metal base body (1) comprises a top beam (12), a cross beam (13) and a longitudinal beam (14), the top beam (12) is of an annular structure, the cross beam (13) and the longitudinal beam (14) are of a U-shaped structure, the cross beam (13) and the longitudinal beam (14) are arranged in a mutually crossing manner, and two ends of the cross beam (13) and two ends of the longitudinal beam (14) are respectively connected with the top beam (12); the lightening holes (11) are formed between the cross beam (13) and the longitudinal beam (14) and/or between the cross beam (13), the longitudinal beam (14) and the top beam (12).

4. The battery box according to claim 3, characterized in that the number of the cross beams (13) and the number of the longitudinal beams (14) are plural, the plural cross beams (13) are arranged at intervals in the front-rear direction (X) of the battery box, and the plural longitudinal beams (14) are arranged at intervals in the left-right direction (Y) of the battery box.

5. A battery box according to claim 3, characterised in that the cross beams (13) and the longitudinal beams (14) are provided with stiffening protrusions (10).

6. The battery box according to any of claims 1 to 5, characterized in that the metal base body (1) further comprises a connecting plate (15), the connecting plate (15) being provided on at least one side of the battery box, the connecting plate (15) being provided with a connecting portion (151).

7. The battery case according to any one of claims 1 to 5, wherein the metal base body (1) further comprises a front panel (16), the front panel (16) is provided on one side of the battery case in a front-rear direction (X) of the battery case, and the front panel (16) is provided with a plug-in hole (161).

8. The battery box body according to claim 7, characterized in that the front panel (16) is further provided with a plurality of through holes (162), and the plastic base body (2) covers the through holes (162).

9. The battery box according to any of claims 1 to 5, characterized in that the metal matrix (1) further comprises a fixing beam (17), the fixing beam (17) being arranged on at least one side outside the battery box.

10. A battery pack characterized by comprising the battery case according to any one of claims 1 to 9.

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