CN214505702U

CN214505702U - Battery pack

Info

Publication number: CN214505702U
Application number: CN202120894536.8U
Authority: CN
Inventors: 陈许超; 于拴柱; 梁建鹏; 孙立新
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-04-27
Filing date: 2021-04-27
Publication date: 2021-10-26
Anticipated expiration: 2031-04-27

Abstract

The utility model discloses a battery pack, battery pack includes: the upper shell body is provided with a first skirt edge in the circumferential direction, the lower shell body is provided with a second skirt edge matched with the first skirt edge in the circumferential direction, the pressing strip is matched on one side, far away from the second skirt edge, of the first skirt edge, and/or the pressing strip is matched on one side, far away from the first skirt edge, of the second skirt edge, and the fastener is suitable for penetrating through the first skirt edge, the second skirt edge and the pressing strip so as to fixedly connect the upper shell body and the lower shell body. According to the utility model discloses battery package can make the intensity of junction between first shirt rim and the second shirt rim obtain strengthening to also can improve the sealed effect of last casing and lower casing, strengthen battery package's security.

Description

Battery pack

Technical Field

The utility model belongs to the technical field of the electric automobile technique and specifically relates to a battery package is related to.

Background

With the decrease of new energy subsidies, the design of low-cost battery packs becomes the key point of research and development design of various large battery factories, but the safety of the battery packs is necessarily put in the first place on the premise of low cost. The sealed face intensity of current battery package casing is relatively weak, has sealed risk of inefficacy, and moreover, the battery package casing among the prior art is relatively poor at the drainage effect of sealed department to influence the sealed and water-proof effects of battery package.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, an object of the utility model is to provide a battery pack, battery pack's casing light in weight, intensity is big, and is sealed effectual, and battery pack's security is better.

According to the utility model discloses battery package, battery package includes: the upper shell body is provided with a first skirt edge in the circumferential direction, the lower shell body is provided with a second skirt edge matched with the first skirt edge in the circumferential direction, the pressing strip is matched on one side, far away from the second skirt edge, of the first skirt edge, and/or the pressing strip is matched on one side, far away from the first skirt edge, of the second skirt edge, and the fastener is suitable for penetrating through the first skirt edge, the second skirt edge and the pressing strip so as to fixedly connect the upper shell body and the lower shell body.

According to the utility model discloses battery pack, through with the layering cooperation keep away from one side of second shirt rim and/or the layering cooperation of second shirt rim in first shirt rim keep away from one side of first shirt rim, then utilize the fastener to link together layering, first shirt rim and second shirt rim, can make the intensity of junction between first shirt rim and the second shirt rim obtain strengthening to also can improve the sealed effect of upper shell body and lower casing, strengthen battery pack's security.

In addition, according to the utility model discloses a battery package can also have following additional technical characterstic:

in some embodiments of the present invention, a water guiding groove is formed on the pressing bar, and the water guiding groove extends along a width direction of the pressing bar.

In some embodiments of the present invention, the upper housing and/or the lower housing comprises: the reinforcing part comprises a metal net which is formed by extruding aluminum alloy, and the reinforcing part is positioned in the SMC composite material layer.

In some embodiments of the present invention, the compression strip comprises: the first folding edge is attached to the first skirt edge and/or the second skirt edge, and the second folding edge is attached to the side face of the upper shell and/or the side face of the lower shell.

In some embodiments of the present invention, the compression strip comprises: the first skirt edge and the second skirt edge are respectively provided with a straight section and a straight section, the straight section of the first skirt edge and the straight section of the second skirt edge are respectively provided with a plurality of straight pressing strips, the straight pressing strips are used for being attached to the straight section of the first skirt edge and/or the straight section of the second skirt edge, and the bent pressing strips are used for being attached to the corner section of the first skirt edge and/or the corner section of the second skirt edge.

Optionally, a first matching portion and a second matching portion are formed at two ends of the plurality of straight pressing strips and the plurality of bending pressing strips respectively, the two adjacent straight pressing strips or the two adjacent straight pressing strips and the first matching portion of the bending pressing strip are used for matching with the second matching portion, and a water guide groove is formed between the first matching portion and the second matching portion.

Furthermore, a first fold line is formed by the projection of the end part of the first matching part on the horizontal plane, a second fold line used for matching with the first fold line is formed by the projection of the end part of the second matching part on the horizontal plane, and the water chute is defined between the first fold line and the second fold line.

In some embodiments of the present invention, a fastening hole is further configured between the first mating portion and the second mating portion, and the fastening hole is configured to mate with the fastening member.

In some embodiments of the present invention, the battery pack further comprises: a sealing layer disposed between the first skirt and the second skirt.

In some embodiments, the sealing layer comprises at least one of a bonding material, fire barrier foam, and a breathable film.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural view of an upper case fitting bead of a battery pack according to an embodiment of the present invention;

fig. 3 is a partial view of an upper housing assembly bead of a battery pack according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a pressing bar of a battery pack according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a straight pressing bar of a battery pack according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a bending pressing bar of a battery pack according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of the cooperation of the straight pressing strip and the bending pressing strip of the battery pack according to the embodiment of the present invention.

Reference numerals:

100: a battery pack;

1: an upper housing; 11: a first skirt edge; 12: an upper housing side;

2: a lower housing;

3: layering; 31: a first folded edge; 32: a second folded edge; 33: pressing the strips straight; 34: bending the pressing strip; 35: a first mating portion; 351: a first fold line; 36: a second mating portion; 361: a second fold line; 37: a water chute;

4: a fastener; 41: a fastening hole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A battery pack 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 7.

As shown in fig. 1 and 2, according to the utility model discloses a battery pack 100 includes casing 1, casing 2 down, layering 3 and fastener 4, upward casing 1 has first shirt rim 11 in week, casing 2 has the second shirt rim (not shown in the figure) with first shirt rim 11 complex in week, in a concrete example, battery pack 100's shell structure is connected after upper casing 1 and casing 2 cooperate in the upper and lower direction down, that is to say, upper casing 1 and casing 2 are through mutually supporting between first shirt rim 11 and the second shirt rim, make and to laminate between casing 1 and the casing 2 down better, thereby can be favorable to fastener 4 assembling along the upper and lower direction, can simplify the assembly degree of difficulty, improve assembly efficiency.

Further, after the first skirt edge 11 and the second skirt edge are respectively arranged on the upper shell 1 and the lower shell 2 of the battery pack 100, the battery pack can also have a certain water retaining function, and can play a role in blocking water from entering the battery pack 100 to a certain extent.

Although the case of the battery pack in the related art basically has a skirt-like design and also serves as a water barrier, the strength of the connection between the upper case and the lower case is often insufficient and the sealing effect is not good due to the fact that the upper case and the lower case are directly connected by bolts at the skirt, which results in low safety of the battery pack 100, and therefore, the strength of the connection between the cases needs to be reinforced.

In an example of the present invention, the pressing strip 3 may be fitted on a side of the first skirt 11 away from the second skirt, for example, as shown in fig. 3, the pressing strip 3 may be fitted on an upper surface of the first skirt 11, and then the fastening member 4 may pass through the first skirt 11, the second skirt and the pressing strip 3 in the up-down direction to fixedly connect the upper casing 1 and the lower casing 2. Since the bead 3 is a metal member made by sheet metal stamping or other processes, the strength of the bead 3 is much greater than the strength of the first and

second skirts

11 and 11. Therefore, after the upper shell 1 and the lower shell 2 are assembled, the pressing strip 3 can better improve the structural strength of the first skirt edge 11 and the second skirt edge after being matched, the fastener 4 is not directly contacted with the first skirt edge 11 and the second skirt edge, the first skirt edge 11 and the second skirt edge can be better protected, the first skirt edge 11 and the second skirt edge are not easy to damage, in addition, the pressing strip 3 can also better transmit the fastening force applied by the fastener 4 on the first skirt edge 11 and the second skirt edge uniformly, and the sealing effect between the first skirt edge 11 and the second skirt edge can be further improved.

In addition, it is understood that the fastening element 4 may be a bolt, or may be other forms of fixing connection elements such as a rivet, which are not described herein again.

In the utility model discloses a in another example, layering 3 cooperation is kept away from one side of first shirt rim 11 at the second shirt rim, and layering 3 is installed in the lower surface of second shirt rim promptly, passes layering 3, second shirt rim and first shirt rim 11 with fastener 4, with last casing 1 and casing 2 fixed connection down, has played reinforced junction intensity equally, improves the effect of casing 1 and the sealed effect of casing 2 down, and it is no longer repeated here.

It should be further noted that, according to the two examples, the pressing strip 3 may be fitted on a side of the first skirt 11 away from the second skirt, the pressing strip 3 may also be fitted on a side of the second skirt away from the first skirt 11, and the pressing strip 3 may also be fitted on an upper surface of the first skirt 11 and a lower surface of the second skirt at the same time, which is not limited herein.

Therefore, according to the utility model discloses battery pack 100, through with the cooperation of layering 3 keep away from one side of second shirt rim and/or layering 3 cooperation keep away from one side of first shirt rim 11 at the second shirt rim at first shirt rim 11, then utilize fastener 4 to link together layering 3, first shirt rim 11 and second shirt rim, can make the intensity of the junction between first shirt rim 11 and the second shirt rim strengthened to can also improve the sealed effect of upper housing 1 and lower housing 2, strengthen battery pack 100's security.

As shown in fig. 3 and 7, a water guide groove 37 is formed in the bead 3, and the water guide groove 37 extends in the width direction of the bead 3. In prior art, the drainage effect of battery package casing at sealed department is relatively poor, if there is rivers to the battery package casing on, water often can not in time be discharged, leads to water probably to enter into inside the battery package from sealed department to influence the sealed and water-proof effects of battery package. Therefore, the water guide groove 37 is formed on the pressing bar 3, so that water flowing to the battery pack case can be timely discharged through the water guide groove 37, and the sealing and waterproof effects of the battery pack 100 are good.

In an example of the present invention, the upper case 1 includes a reinforcement and an SMC composite material layer, the reinforcement includes a metal mesh, the metal mesh is formed by extrusion of an aluminum alloy, and the reinforcement is located in the SMC composite material layer. The metal mesh herein is not limited to a metal mesh of a fine and dense mesh structure extruded from an aluminum alloy, but may be a metal frame made of an aluminum alloy, and the strength of the upper case 1 can be enhanced by placing such a reinforcement member in the SMC composite material layer. In another example of the present invention, the lower case 2 includes a reinforcement and an SMC composite layer, the reinforcement includes a metal mesh, the metal mesh is formed by extrusion of an aluminum alloy, and the reinforcement is located in the SMC composite layer. The strength of the lower case 2 can be enhanced by placing the metal mesh made of aluminum alloy in the SMC composite material layer.

It should be further noted that, in the actual manufacturing of the battery pack 100, only the upper case 1 may be processed into the structure of the reinforcement and the SMC composite layer, only the lower case 2 may be processed into the structure of the reinforcement and the SMC composite layer, and both the upper case 1 and the lower case 2 may be processed into the structure of the reinforcement and the SMC composite layer according to actual needs, which is not limited herein.

In the prior art, most of battery pack shells are made of SMC materials, so that the strength is poor, and the shells can crack when the battery packs are out of control due to heat, so that the battery packs are subjected to flame spraying; and the metal plate shell has heavier weight and weaker strength of a sealing surface, so that the risk of sealing failure exists. In some examples of the present invention, the upper case 1 and/or the lower case 2 of the battery pack 100 are processed into the structure of the reinforcing member and the SMC composite layer, which not only can enhance the strength of the case of the battery pack 100, but also can further enhance the strength of the joint between the pressing bar 3 and the upper case 1 and/or the lower case 2, and the weight of the case is lighter, thereby improving the safety of the battery pack 100.

In some embodiments of the present invention, the bead 3 comprises a first flange 31 and a second flange 32. For example, as shown in the figures, the first folding edge 31 and the second folding edge 32 are perpendicular to each other, so that the pressing strip 3 has a thicker portion (the first folding edge 31 or the second folding edge 32) to bear an external force regardless of the force applied from the direction of the first folding edge 31 or the direction of the second folding edge 32, so that the pressing strip 3 is not easily bent. Thus, by designing the bead 3 in a structural form having the first folded edge 31 and the second folded edge 32, the strength of the bead 3 can be enhanced. Further, in an example of the bead 3, as shown in fig. 3, the bead 3 is connected with the first skirt 11 in a matching manner, specifically, the first folded edge 31 is attached to the upper surface of the first skirt 11, and the second folded edge 32 is attached to the upper shell side 12 of the upper shell 1. In another example of the bead 3, the bead 3 is connected with the second skirt in a matching manner, specifically, the first folded edge 31 is attached to the lower surface of the second skirt, and the second folded edge 32 is attached to the lower shell side surface of the lower shell 2. Therefore, the pressing strips 3 can be well assembled, and the structural strength of the upper shell 1 and the lower shell 2 can be well improved.

From this, through be equipped with first hem 31 and second hem 32 on layering 3, can improve the structural strength of layering 3, through first hem 31 and first shirt rim 11 and/or the laminating of second shirt rim, the laminating of second hem 32 and last casing side 12 of last casing 1 and/or lower casing 2 side of casing 2 down can improve between casing 1 and the lower casing 2 the reliability of sealing, and then has improved battery package 100's security.

In some embodiments of the present invention, as shown in fig. 4-6, the bead 3 includes a plurality of straight beads 33 and a plurality of bent beads 34. In one example, the bead 3 is cooperatively connected to the first skirt 11, a plurality of straight beads 33 are adapted to engage a straight section of the first skirt 11, and a plurality of bent beads 34 are adapted to engage a corner section of the first skirt 11. In another example, the bead 3 is connected to the second skirt in a matching manner, a plurality of straight beads 33 are used for being attached to the straight section of the second skirt, and a plurality of bent beads 34 are used for being attached to the corner section of the second skirt. It should be further noted that, for the two examples, since the pressing strip 3 may be connected with the first skirt 11 in a matching manner, may also be connected with the second skirt in a matching manner, and may also be connected with the first skirt 11 and the second skirt in a matching manner, respectively, a plurality of straight pressing strips 33 and a plurality of bent pressing strips 34 of the pressing strip 3 are correspondingly connected in a matching manner according to the specific installation position of the pressing strip 3, which is not limited herein.

It should be further noted that, for the straight pressing strips 33 and the bent pressing strips 34, the size specification of the battery pack 100, the capacity of the battery pack 100, the arrangement of the battery modules, and the installation space of the battery pack 100 are determined, that is, the sizes of the cases of the battery packs 100 with different capacities, different arrangement modes of the battery modules, and different installation spaces are greatly different. Therefore, the pressing strip 3 is designed to be composed of a plurality of straight pressing strips 33 and a plurality of bent pressing strips 34, when the pressing strip 3 is matched with the shell of the battery pack 100, the straight pressing strips 33 or the bent pressing strips 34 with proper specification and size can be selected according to the actual size of the shell of the battery pack 100, the pressing strips 3 matched with the upper shell 1 and/or the lower shell 2 are spliced, and the operation is simple and convenient. Moreover, the straight pressing strips 33 and the bent pressing strips 34 with certain specifications can be commonly used on the battery packs 100 with different sizes, so that the development of a pressing strip 3 die is reduced, and the cost for manufacturing the die is reduced. In addition, the pressing strip 3 is designed to be composed of a plurality of straight pressing strips 33 and a plurality of bent pressing strips 34, so that the processing difficulty of the pressing strip 3 can be further reduced, the production of the pressing strip 3 is more convenient and faster, and the efficiency is improved.

In some embodiments, bead 3 is comprised of a plurality of straight beads 33 and a plurality of bent beads 34 connected end-to-end. When the pressing strips 3 are combined by selecting a plurality of straight pressing strips 33 and a plurality of bent pressing strips 34, the straight pressing strips 33 and the bent pressing strips 34 with proper sizes can be selected according to the specific size of the shell of the battery pack 100, and the first skirt edge 11 and/or the second skirt edge matched with the pressing strips can be completely surrounded by the straight pressing strips 33 and the bent pressing strips 34 which are sequentially connected end to end. In one example, as shown in fig. 4, bead 2 is comprised of 4

straight beads

33 and 4 bent beads 34. The pressing strip 3 is formed by combining a plurality of straight pressing strips 33 and a plurality of bent pressing strips 34 end to end, so that the pressing strip 3 can be combined more conveniently and quickly and is convenient to operate.

In some embodiments of the present invention, the two ends of the plurality of straight pressing strips 33 and the plurality of bending pressing strips 34 are respectively formed with a first matching portion 35 and a second matching portion 36, the first matching portions 35 of two adjacent straight pressing strips 33 are connected with the second matching portion 36 in a matching manner, or the first matching portions 35 of the adjacent straight pressing strips 33 and the bending pressing strips 34 are connected with the second matching portion 36 in a matching manner. Through the matching connection of the first matching part 35 and the second matching part 36, two adjacent straight pressing strips 33 or the adjacent straight pressing strips 33 and the bent pressing strips 34 can be rapidly assembled together, and the assembling efficiency of the pressing strips 3 is improved.

Further, as shown in fig. 7, a water guiding groove 37 is formed at the joint of the first matching portion 35 and the second matching portion 36, so that accumulated water stored between the second folded edge 32 of the bead 3 and the upper case 1 can be guided out along the water guiding groove 37, the upper case 1 is prevented from being corroded, and the safety performance of the battery pack 100 is improved.

In some embodiments, as shown in fig. 5-7, the projection of the end of the first matching portion 35 on the horizontal plane forms a first folding line 351, and the projection of the end of the second matching portion 36 on the horizontal plane forms a second folding line 361 for matching with the first folding line 351. The first folding line 351 and the second folding line 361 are matched, so that the first matching part 35 and the second matching part 36 can be connected in a quick matching mode, and the assembling efficiency of the pressing strip 3 can be improved.

Further, as shown in fig. 7, the first folding line 351 and the second folding line 361 may define the water chute 37. The water chute 37 defined by the first folding line 351 and the second folding line 361 can lead accumulated water stored between the second folding edge 32 of the pressing strip 3 and the upper shell 1 out along the water chute 37, so that the upper shell 1 is prevented from being corroded, and the safety performance of the battery pack 100 is improved.

In some embodiments of the present invention, a fastening hole 41 is further configured between the first and

second mating portions

35 and 36 for mating with the fastening member 4. As shown in fig. 7, a fastening hole 41 is formed between the first and second

fitting portions

35 and 36 for allowing the fastening member 4 to pass therethrough, thereby connecting the bead 3, the upper case 1, and the lower case 2 together by the fastening member 4. The fastening holes 41 are preset to facilitate installation of the pressing strips 3, holes do not need to be formed in the pressing strips 3 during installation, installation labor intensity is reduced, installation efficiency is improved, and labor cost is saved.

In some embodiments of the present invention, the battery pack 100 includes a sealing layer disposed between the first skirt 11 and the second skirt. A sealing layer is arranged between the first skirt edge 11 and the second skirt edge, the shell of the battery pack 100 is connected through the pressing strip 3 and the fastening piece 4, and the sealing performance of the whole battery pack 100 can be further improved through the sealing layer.

In some embodiments, the sealing layer may include at least one of a bonding material, fire barrier foam, and a breathable film. The adhesive material can be common adhesive materials such as silica gel, structural adhesive and the like. The fire-retardant foam is made of a flame-retardant material, and has the advantages of high temperature resistance, flame retardance and the like. The breathable film is a water-blocking breathable film for the storage battery, allows gas to permeate, and provides a reliable blocking effect for water, oil, dust and other substances which can affect the interior of the battery pack. It is understood that, for many types of power batteries, such as lithium ion batteries, the batteries generate heat during discharging and charging processes, and the generated heat increases the pressure in the battery case (the internal gas absorbs heat and expands). The water-blocking and air-permeable film of the storage battery can be used for continuously and dynamically balancing the internal and external pressure of the battery box due to more and less micropores, so that the battery is ensured to be always in a good performance state. Meanwhile, the water-blocking and air-permeable film of the storage battery can effectively exclude liquid and particle pollutants from the device of the battery pack 100. At least one of a bonding material, fire-retardant foam and a breathable film is used in the sealing layer of the battery pack 100, so that the effects of high temperature resistance, oxygen isolation and condensation absorption of the sealing layer of the battery pack 100 can be improved, and the safety and reliability of the battery pack 100 and the structural strength of the battery pack 100 are improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack, comprising:

the upper shell is provided with a first skirt edge in the circumferential direction;

the lower shell is provided with a second skirt edge matched with the first skirt edge in the circumferential direction;

the pressing strip is matched on one side, far away from the second skirt edge, of the first skirt edge, and/or the pressing strip is matched on one side, far away from the first skirt edge, of the second skirt edge;

a fastener adapted to pass through the first skirt, the second skirt and the bead to fixedly connect the upper shell and the lower shell.

2. The battery pack according to claim 1, wherein the bead is formed with a water guide groove extending in a width direction of the bead.

3. The battery pack according to claim 1, wherein the upper case and/or the lower case comprises:

a reinforcement comprising a metal mesh extruded from an aluminum alloy;

a SMC composite layer, the reinforcement being located within the SMC composite layer.

4. The battery pack of claim 1, wherein the compression bead comprises:

the first folding edge is attached to the first skirt edge and/or the second skirt edge, and the second folding edge is attached to the side face of the upper shell and/or the side face of the lower shell.

5. The battery pack of claim 1, wherein the compression bead comprises:

the plurality of straight pressing strips are used for being attached to the straight section of the first skirt edge and/or the straight section of the second skirt edge;

and the bending pressing strips are used for being attached to the corner sections of the first skirt edge and/or the second skirt edge.

6. The battery pack according to claim 5, wherein a first mating portion and a second mating portion are respectively formed at two ends of the plurality of straight pressing strips and the plurality of bent pressing strips, two adjacent straight pressing strips or the first mating portions of the adjacent straight pressing strips and the bent pressing strips are used for mating with the second mating portions, and a water guide groove is formed between the first mating portions and the second mating portions.

7. The battery pack according to claim 6, wherein a projection of the end of the first engaging portion on a horizontal plane forms a first folding line, a projection of the end of the second engaging portion on a horizontal plane forms a second folding line for engaging with the first folding line, and the first folding line and the second folding line define the water chute therebetween.

8. The battery pack of claim 6, wherein a fastening hole is further defined between the first and second mating portions for mating with the fastening member.

9. The battery pack of any one of claims 1-8, further comprising: a sealing layer disposed between the first skirt and the second skirt.

10. The battery pack of claim 9, wherein the sealing layer comprises at least one of a bonding material, fire retardant foam, and a gas permeable membrane.