CN211238330U

CN211238330U - Lower shell assembly and battery pack thereof

Info

Publication number: CN211238330U
Application number: CN201922327272.3U
Authority: CN
Inventors: 黄毅轩; 陈许超; 陈荣康; 董汝帅; 梁建鹏; 王路
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-08-11
Anticipated expiration: 2029-12-20

Abstract

The utility model relates to a power battery makes the field, a casing subassembly and battery package down is disclosed, this time casing subassembly includes interconnect's boundary beam (100) and bottom plate (200), the boundary beam includes preceding boundary beam (110), preceding boundary beam is connected with connector panel (300), connector panel package board body (310) and encircle protruding establishing at the peripheral being used for of plate body respectively with preceding boundary beam and bottom plate continuous connection border (320), connect the border and establish towards the direction of bottom plate is protruding, and form accommodation space (330) in one side of plate body towards the bottom plate. The utility model increases and fully utilizes the internal space of the battery pack under the condition of not increasing the size of the battery pack; the safety problem caused by the reverse installation of the positive electrode and the negative electrode is effectively avoided by arranging the error-proof convex columns; the battery pack connector protecting plate is arranged, so that the battery pack connector which is easy to collide and pollute is fully protected; the light weight and the cost saving of the battery pack are realized while the safety of the battery pack and the reliability of the whole vehicle are improved.

Description

Lower shell assembly and battery pack thereof

Technical Field

The utility model relates to a power battery makes the field, specifically relates to casing assembly and battery package down.

Background

In the conventional battery pack, the lower case is generally manufactured by welding the edge beam and the bottom plate, both of which are manufactured by an aluminum profile extrusion process. Firstly, the connection and fixation of the low-voltage plug connector and the high-voltage plug connector in the battery pack and the battery core are realized through the plug connector panels arranged in the boundary beams. The internal space that current connector panel reserved for the battery package is little, leads to battery package internal space to be nervous, is unfavorable for the make full use of battery package internal space. Secondly, the high-voltage wire harness is generally connected with the total positive and total negative of the battery pack, the voltage is the total voltage of the battery pack, the high-voltage wire harness or the soft copper bar inside the battery pack is soft and easy to deform, and the risk of reverse installation exists in the two high-voltage wire harnesses or the soft copper bar close to the connector part. Once the high-voltage wire harness or the soft copper bar is reversely installed, the electric automobile is seriously damaged, and huge property loss or casualties can be caused. Meanwhile, in the prior art, because the size of the connector for connecting the battery pack and the whole vehicle is usually larger, if the connector is directly fixed on the side beam of the battery pack lower shell, the height of the battery edge beam is easily larger, and the weight reduction is not facilitated. In addition, in the driving process of the battery car, the battery pack connector is easy to collide, and the existing connector guard plate needs to be fixed on an extra bracket of the car body, so that the whole structure is complex.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the problem that the inner space that prior art exists is little, easily adorn anti-, the size is big and easily collide with, providing casing assembly and battery package down, being equipped with the connection border towards the bottom plate through the plate body epirelief at the connector panel to form accommodation space in one side of plate body towards the bottom plate, can ensure that the inner space of battery package can obtain abundant utilization.

In order to achieve the above object, an aspect of the present invention provides a lower casing assembly, boundary beam and bottom plate including interconnect, the boundary beam includes the front boundary beam, the front boundary beam is connected with the connector panel, the connector panel includes the plate body and encircles protruding the peripheral being used for of plate body respectively with the front boundary beam with the connection border that the bottom plate links to each other, connect the border orientation the protruding establishment of direction of bottom plate, and the plate body orientation one side of bottom plate forms accommodation space.

Preferably, the connector panel is connected to the middle of the front edge beam, two sides of the plate body are respectively connected with the front edge beam through the connecting edge, and one side surface of the plate body, which is far away from the connecting edge, is flush with the outer side surface of the front edge beam.

Preferably, the plate body is provided with a connector through hole, and a connector is fixed in the connector through hole; the connector is provided with a first plugging position and a second plugging position, a first plug and a second plug of a wiring harness are respectively connected with the first plugging position and the second plugging position, and the first plug and the second plug are accommodated in the accommodating space; the plate body is provided with a mistake-proof convex column which can interfere with the first plug and the second plug when the first plug and the second plug are not inserted into the correspondingly arranged plugging position and can not be connected with the plugging position.

Preferably, a plurality of mounting holes are formed in the plate body, the connector is fixed to the plate body through fasteners penetrating through the mounting holes, a plurality of mounting bosses are formed in the accommodating space by the fasteners, and the error-proofing boss is formed by at least one of the mounting bosses.

Preferably, the transverse dimension of at least one of the mounting bosses forming the error-proofing boss in the length direction of the plate body is larger than the transverse dimension of the rest of the mounting bosses in the length direction of the plate body.

Preferably, the first plug is a positive plug, and the second plug is a negative plug.

Preferably, the connector panel is connected to the middle of the front side beam, and the connector panel includes a straight portion for connecting to the front side beam on both sides and a protruding portion protruding from the straight portion.

Preferably, the straight portion is the same height as the front side rail.

Preferably, one side of the connector panel, which deviates from the connecting edge, is provided with a connecting end used for being connected with the connector guard plate, and the connecting end is provided with a connecting hole.

A second aspect of the present invention provides a battery pack, preferably, the battery pack includes the lower housing assembly as described above.

Through above-mentioned technical scheme, be equipped with the connection border towards the bottom plate through the plate body epirelief at the connector panel to form accommodation space in the plate body towards one side of bottom plate, can ensure that the inner space of battery package can obtain abundant utilization.

Drawings

Fig. 1 is a partial structural schematic view of a lower housing assembly according to an embodiment of the present invention;

FIG. 2 is a schematic top view of the overall structure of the lower housing assembly shown in FIG. 1;

fig. 3 and 4 are schematic diagrams of front and back structures of the connector panel of the present invention, respectively;

FIG. 5 is a schematic view of a connector structure on a connector panel according to an embodiment of the present invention;

fig. 6 is a schematic diagram of the correct plugging position of the positive plug and the negative plug of the present invention;

fig. 7 is an interference schematic diagram of the wrong plugging position of the positive plug and the negative plug of the present invention;

fig. 8 is a schematic view of the connection position structure between the connector guard plate and the lower housing assembly and the electric vehicle body according to the present invention.

Description of the reference numerals

100 edge Beam 110 front edge Beam 200 bottom plate 300 front Panel 301 Flat 302 projection 310 plate 311 connector Panel 301 connector through hole 312 connector 3121 first Patch position 3122 second Patch position 313 mistake proofing post 314 mounting hole 315 fastener 320 attachment end 340 attachment end 341 attachment end connection hole 400 harness 410 first plug 420 second plug 500 connector shield 600 body attachment

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, the use of directional terms such as "upper, lower, left, right" generally means upper, lower, left, right as viewed with reference to the accompanying drawings, unless otherwise specified; "inner and outer" generally refer to the inner and outer relative to the profile of the components themselves; "distal and proximal" generally refer to distance relative to the contour of the components themselves.

As shown in fig. 1 in combination with fig. 2, an aspect of the present invention provides a lower housing assembly, which includes an edge beam 100 and a bottom plate 200 connected to each other, wherein the edge beam 100 includes a front edge beam 110, and the front edge beam 110 is connected to a connector panel 300. As shown in fig. 1 and 2 in combination with fig. 3 and 4, the connector panel 300 includes a plate body 310 and a connecting edge 320 protruding around the periphery of the plate body 310 and connecting to the front side beam 110 and the bottom plate 200, respectively, wherein the connecting edge 320 protrudes toward the bottom plate 200, and a receiving space 330 is formed on a side of the plate body 310 facing the bottom plate 200. As can be seen from the above, in the present invention, since the connection edge 320 is protruded toward the bottom plate 200, and the plate body 310 faces the accommodating space 330 is formed on one side of the bottom plate 200, the connector connected to the connector panel 300 and the wiring harness thereof can be accommodated in the accommodating space 330 by adopting the above structure, so that the reserved space inside the battery pack can be not occupied as much as possible, and the internal space of the battery pack can be fully utilized. As shown in the embodiment of fig. 1, specifically, if the total thickness of the connector panel 300 of the battery pack is 30mm, the height of the connecting edge 320 protruding out of the plate body 310 is about 25mm, that is: the depth of the receiving space 330 is about 25 mm. The wall thickness of the connecting rim 320 is 5 mm. Because the utility model discloses change accommodation space 330 among the prior art towards the structure in the battery package outside into the utility model discloses accommodation space 330 sets up towards the inboard structure of battery package, thus makes accommodation space 330's 25 mm's thickness space, puts into inside the battery package, is favorable to increasing the inner space of battery package, the assembly operation of being convenient for.

As shown in fig. 1, in order to facilitate the connection of connector panel 300 at the middle position of front side beam 110 and ensure that two sides of board 310 are respectively connected to front side beam 110 via connecting edge 320, a side surface of board 310 facing away from connecting edge 320 is flush with an outer side surface of front side beam 110. In the embodiment shown in fig. 1, connector panel 300 is located at a middle position in the front of the battery pack, and mainly functions to: the high-voltage connector and the low-voltage connector of the battery pack are convenient to fix; the installation of the shell on the battery pack is convenient; and simultaneously, the upper shell and the lower shell of the battery pack are convenient to seal. Of course, the connector panel 300 may be located at a middle position of the rear of the battery pack, and the same effect can be achieved.

As shown in fig. 3 and 4 in combination with fig. 5 and 6, the plate body 310 is provided with a connector through hole 311, and a connector 312 is fixed in the connector through hole 311; the connector 312 is provided with a first plugging position 3121 and a second plugging position 3122, the first plug 410 and the second plug 420 of the wiring harness 400 are respectively connected to the first plugging position 3121 and the second plugging position 3122, and the first plug 410 and the second plug 420 are accommodated in the accommodating space 330.

As shown in fig. 6 in combination with fig. 7, in order to prevent the first plug 410 and the second plug 420 with the wiring harness 400 from being inserted incorrectly between the first plugging position 3121 and the second plugging position 3122, the plate body 310 is further provided with an error-proof post 313. FIG. 6 is an illustration of a proper patching position, in which there is no interference between the wiring harness and the connector panel. When the first plug 410 and the second plug 420 are inserted into the first plugging position 3121 and the second plugging position 3122, a stable connection between the plugs and the plugging positions can be ensured. If the inserting positions of the first plug 410 and the second plug 420 are wrong, and the correspondingly arranged plugging positions are not inserted, as shown in fig. 7, the wrong plugging position shows that, in the position, the first plug 410 which should be inserted into the first plugging position 3121 is inserted into the second plugging position 3122, the directions of the tabs of the first plug 410 and the second plugging position are different, when the left plug and the right plug are reversely installed, the interference between the right lower part of the first plug 410 and the error-proof convex column 313 occurs, so that the first plug 410 cannot be completely inserted into the second plugging position 3122, and cannot be connected with the plugging positions, and the purpose of error prevention is achieved.

Further, as shown in fig. 3 to 5, a plurality of mounting holes 314 are provided on the plate body 310 of the connector panel 300, and the connectors 312 are fixed to the plate body 310 by fasteners 315 provided through the mounting holes 314. As shown in fig. 4, the fastening member 315 is a fixing bolt, the fixing bolt forms a plurality of mounting bosses 331 in the receiving space 330, and at least one of the mounting bosses 331 forms the error-proofing boss 313. In order to achieve the error prevention effect, the cross-sectional shape of the error prevention protrusion 313 is different from the cross-sectional shapes of the other mounting bosses 331, and the lateral dimension of at least one of the mounting bosses 331 forming the error prevention protrusion 313 in the length direction of the plate body 310 is larger than the lateral dimension of the remaining mounting bosses 331 in the length direction of the plate body 310. In the embodiment shown in fig. 3 to 5, the cross-sectional shape of the error-proofing boss 313 is an oval, and the other mounting bosses 331 are provided as cylinders having a generally circular cross-sectional shape. The cross-sectional shape of the error-proof convex column 313 long circle is arranged, so that the cost is saved, and the risk caused by reverse installation of a plug made of a softer material is effectively prevented. Of course, the cross-sectional shape of the error-proofing boss 313 is not limited thereto, and other cross-sectional shapes may be adopted according to actual needs, as long as the size is large enough to achieve the effect of error proofing due to interference when the plugging positions of the first plug 410 and the second plug 420 are wrong.

Further, in the present embodiment, the first plug 410 is a positive plug, and the second plug 420 is a negative plug. The first plug 410 and the second plug 420 may take a variety of configurations, such as: the high-voltage wire harness can be a high-voltage wire harness and can also be a copper bar. In the above-described embodiments of the present invention, a high-voltage wiring harness structure is used. Normally, the distance between two mounting holes of the connector is about 20mm, the two mounting holes are respectively installed into the total positive and total negative of the high-voltage wire harness of the battery pack by bolts, and the potential difference of the two high-voltage wire harnesses is the total voltage of the battery pack. Because the high-voltage wire harness is soft, the left and right reverse installation errors are easy to occur when the high-voltage plug-in is installed. If the position of high-voltage wire harness or copper bar is installed reversely, the electric automobile is seriously damaged, and even huge property loss or casualties can be caused. Therefore, the error prevention of the positive plug and the negative plug of the high-voltage wire harness is a very important problem.

As shown in fig. 1 in combination with fig. 3 to 5, the connector panel 300 is connected to the middle of the front side beam 110, the connector panel 300 includes a flat portion 301 for connecting to the front side beam 110 on both sides and a protruding portion 302 protruding from the flat portion 301, and for convenience of description, as shown in fig. 3, the flat portion 301 and the protruding portion 302 of the connector panel 300 are separated by a dotted line, but in practical applications, they are an integral body that cannot be separated. As shown in fig. 1, the straight portion 301 has the same height as the front side member 110 in order to facilitate connection while reducing space and cost.

Because what the casing adopted under the battery package is that the aluminium alloy tailor-welding technology processing forms, therefore can't realize complicated section type, so the utility model discloses the connector panel that has set up an adoption high pressure cast aluminium or forged and made welds with the section bar to the manufacturing of casing under the completion. In general, the perimeter of the side beam of the lower shell is larger, and for example, the length of the side beam is close to 5.2 meters in the lower shell with the size of 1600mm × 1000mm, and the height of the side beam of the lower shell determines the weight of the lower shell, so that the reduction of the height of the side beam of the lower shell is one of the important means for reducing the weight. If the high-voltage connector and the low-voltage connector of the battery pack are large in size and are directly mounted on the lower shell, the side beam of the lower shell is large in height, and therefore weight reduction is not facilitated. The utility model discloses set up connector panel 300 into including two parts of straight portion 301 and protruding portion 302, and straight portion 301 part and the boundary beam that links to each other rather than equal height, protruding portion 302 is enough high and leave the space that holds, reaches and increases, its and lower casing welded position height is lower and the high higher effect of connector position with casing boundary beam part down, has not only satisfied and has subtract heavy, has also satisfied the installation requirement simultaneously.

Since the battery pack is disposed under the floor of the power automobile, when the automobile wades, silt and water may splash onto the high-voltage connector and the low-voltage connector, although the Protection safety level of the high-voltage connector and the low-voltage connector reaches IP67(IP is an abbreviation of Ingressprotective Rating (or International protective code), which defines the Protection capability of an interface against liquid and solid particles, the IP67 explains the requirements of Protection against dust inhalation (overall prevention of contact, Protection against dust penetration) and Protection against short-term immersion (immersion prevention)). However, if the connector is clogged by sludge or sand or stones hit the connector, the operation of the battery pack is abnormal, and therefore, the battery pack needs to be protected. In order to solve the protection problem, as shown in fig. 3, a connecting end 340 for connecting with the connector shield 500 shown in fig. 8 is disposed on a side of the connector panel 300 away from the connecting edge 320, and a connecting hole 341 is disposed on the connecting end 340. Can fix connector backplate 500 on whole car on connector panel 300 and automobile body 600 through adopting the buckle, the utility model discloses a set up connector guard plate 500 and get up the anterior high, low pressure interface of battery package and pencil protection, improve the security performance of battery package, prevent silt and crashproof.

The utility model discloses the second aspect provides a battery package, battery package includes as above the lower casing assembly, consequently this battery package has following characteristics: because the utility model provides a lower casing subassembly in the battery package adopts CMT (cold metal transition technique of ColdMetal Transfer) welding process to weld the connector panel 300 of high-pressure casting process and the front edge beam 110 of section bar extruded lower casing, sets up connector through-hole 311 at connector panel 300 simultaneously, and this connector through-hole 311 can include high pressure interface and low pressure interface to set up mounting hole 314 on the plate body 310 of connector panel 300. The fixing bolt 315 forms a plurality of mounting bosses 331 in the accommodating space 330 through the mounting hole 314, and adjusts the shape of one of the mounting bosses 331 from the existing cylindrical shape to a long cylindrical shape, so that the size is increased to form the error-proof boss 313, thereby avoiding safety problems and loss caused by reverse installation of positive and negative electrodes. Because connector panel 300 has included plate body 310 and has encircleed protruding the establishing the peripheral connection border 320 of plate body 310, connection border 320 orientation the protruding establishment of direction of bottom plate 200, and plate body 310 orientation one side of bottom plate 200 forms accommodation space 330, has constituted the structure of "evagination", can be under the condition that does not increase battery package size, increase battery package inner space, make full use of battery package inner space, make the battery package arrange compacter, avoided connector panel section bar extrusion technology to be difficult to the realistic cut type preparation, realized the setting of a function, improved the security of battery package simultaneously, the reliability of whole car and the lightweight of battery package, and practice thrift the cost. In addition, through setting up the connector backplate, the battery of battery car driving in-process makes easily colliding with, the battery package connector of easy pollution obtain fully protecting, and the connector backplate that sets up on casing and automobile body need not to set up the support at the automobile body additional like prior art, and overall structure is simple compact.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. The utility model discloses an in the technical conception scope, can be right the utility model discloses a technical scheme carries out multiple simple variant, for example, but lower casing subassembly forges, can cast, also can use aluminium extruded section bar or aluminum plate to bend the spare part of preparation looks isostructure. In order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a lower shell subassembly, includes interconnect's boundary beam (100) and bottom plate (200), boundary beam (100) includes preceding boundary beam (110), preceding boundary beam (110) are connected with connector panel (300), its characterized in that, connector panel (300) include plate body (310) and encircle protruding establishing plate body (310) peripheral be used for respectively with preceding boundary beam (110) with the connection border (320) that bottom plate (200) link to each other, connect border (320) orientation the direction of bottom plate (200) is protruding to be established, and plate body (310) orientation one side formation accommodation space (330) of bottom plate (200).

2. The lower housing assembly according to claim 1, wherein the connector panel (300) is connected to the front side beam (110) at a middle position, two sides of the plate body (310) are respectively connected to the front side beam (110) through the connecting edges (320), and a side surface of the plate body (310) facing away from the connecting edges (320) is flush with an outer side surface of the front side beam (110).

3. The lower shell assembly of claim 1, wherein the plate body (310) is provided with a connector through hole (311), and a connector (312) is fixed in the connector through hole (311); the connector (312) is provided with a first plugging position (3121) and a second plugging position (3122), a first plug (410) and a second plug (420) of the wiring harness (400) are respectively connected with the first plugging position (3121) and the second plugging position (3122), and the first plug (410) and the second plug (420) are accommodated in the accommodating space (330);

the plate body (310) is provided with a mistake-proofing convex column (313) which can interfere with at least one of the first plug (410) and the second plug (420) when the first plug (410) and the second plug (420) are not inserted into the correspondingly arranged first plugging position (3121) and the second plugging position (3122) and cannot be connected with the first plugging position (3121) and the second plugging position (3122).

4. A lower housing assembly according to claim 3, wherein a plurality of mounting holes (314) are provided on the plate body (310), the connector (312) is fixed on the plate body (310) by fasteners (315) provided through the mounting holes (314), the fasteners (315) form a plurality of mounting bosses (331) in the receiving space (330), and at least one of the mounting bosses (331) forms the error-proofing boss (313).

5. The lower housing assembly according to claim 4, wherein a transverse dimension of at least one of the mounting bosses (331) forming the error-proofing boss (313) in a length direction of the plate body (310) is larger than a transverse dimension of the remaining mounting bosses (331) in the length direction of the plate body (310).

6. A lower housing assembly according to claim 3, wherein the first plug (410) is a positive plug and the second plug (420) is a negative plug.

7. A lower housing assembly according to claim 1, wherein the connector panel (300) is attached to the middle of the front side beam (110), the connector panel (300) including a straight portion (301) for connecting to the front side beam (110) on both sides and a protruding portion (302) protruding from the straight portion (301).

8. The lower housing assembly of claim 7, wherein the flat portion (301) is the same height as the front side beam (110).

9. A lower housing assembly according to claim 3, wherein a side of the connector panel (300) facing away from the connecting edge (320) is provided with a connecting end (340) for connecting with a connector shield (500), and the connecting end (340) is provided with a connecting hole (341).

10. A battery pack, characterized in that the battery pack comprises the lower housing assembly according to any one of claims 1 to 9.