CN210123766U

CN210123766U - Battery pack with waterproof function

Info

Publication number: CN210123766U
Application number: CN201921329100.3U
Authority: CN
Inventors: 李文灶; 张志荣; 宋维哲
Original assignee: Taipu Power New Energy (changshu) Co Ltd
Current assignee: Taipu Power New Energy (changshu) Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2020-03-03
Anticipated expiration: 2029-08-16

Abstract

The utility model provides a group battery with waterproof function contains a battery module, a conductor wire and a bag form waterproof construction. The battery module includes a plurality of battery cells, and the battery cells are connected in series or in parallel with each other. Conductive wires are connected to the battery cells. The bag-shaped waterproof structure is used for accommodating the battery module and comprises a waterproof flexible layer and a covering piece. The waterproof flexible layer is defined with a wire outlet, and the conductive wire passes through the wire outlet and then extends to the outside of the waterproof flexible layer. The covering piece covers the outlet and a part of the conductive wire, so that water is prevented from entering the interior of the waterproof flexible layer from the outlet.

Description

Battery pack with waterproof function

Technical Field

The present invention relates to a battery pack, and more particularly, to a battery pack having a waterproof function.

Background

With the development of technology, transportation vehicles have progressed from gasoline as fuel for automobiles and motorcycles to natural gas as fuel for automobiles and motorcycles as power supply to operate the automobiles and the motorcycles, while bicycles have traditionally operated by manpower to drive machinery as power to operate the bicycles. Of course, with the gradual decrease of fuel raw materials, the gradual increase of prices, and the rising of environmental awareness, vehicles including electric bicycles, electric locomotives, gasoline-electric vehicles, and the like have been developed.

With the development of transportation vehicles and the emphasis on electric transportation vehicles in the green energy-saving industry, battery packs for supplying electric power to transportation vehicles become an important element. However, in a wet area, the lifetime of the electronic device or the Battery may be reduced, and particularly, in a Battery Pack suitable for a transportation vehicle, if water enters a Battery Module (Battery Module) of the Battery Pack (Battery Pack) due to rain or water accumulation during traveling, the Battery Module may cause serious damage.

Fig. 1 shows a schematic view of a battery pack having a waterproof function according to a known art. The structure shown in fig. 1 is a waterproof structure of a battery pack of japanese patent laid-open No. 8-298103. As shown in fig. 1, the battery pack 100 includes a case 111, an upper cover 112, a waterproof plastic layer 120, and battery modules 200. The battery module 200 includes a plurality of battery cells 211. The waterproof plastic layer 120 and the plurality of battery cells 211 are disposed in the accommodating space defined by the housing 111 and the upper cover 112. An opening is formed above the housing 111, the battery cells 211 are disposed in the housing 111, and the waterproof plastic layer 120 is disposed on a side of the housing 111 and is formed in an open shape to cover the opening. The case 111 and the waterproof plastic layer 120 are integrally formed to seal the battery cell 211 in the case 111, thereby preventing water from entering the battery pack 100, and finally, the upper cover 112 is covered on the case 111.

However, there is room for further improvement in known waterproof structures. Therefore, it is worth to discuss how to prevent water drops or dust from entering the battery modules 200 of the battery pack 100 and affecting the operation and life of the battery modules 200.

SUMMERY OF THE UTILITY MODEL

An object of an embodiment of the present invention is to provide a battery module with a waterproof structure.

According to an embodiment of the present invention, a battery pack includes a battery module, a conductive wire, and a pouch-shaped waterproof structure. The battery module includes a plurality of battery cells, and the battery cells are connected in series or in parallel with each other. Conductive wires are connected to the battery cells. The bag-shaped waterproof structure is used for accommodating the battery module and comprises a waterproof flexible layer and a covering piece. The waterproof flexible layer is provided with a wire outlet, and the conductive wire penetrates through the wire outlet and then extends to the outside of the waterproof flexible layer. The covering piece covers the wire outlet and a part of the conductive wire, so that water or water gas is prevented from entering the waterproof flexible layer from the wire outlet.

In one embodiment, the conductive wires are outside the waterproof flexible layer and extend along a first direction. The covering piece and the waterproof flexible layer define an accommodating space, and the accommodating space defines an opening. And after the conducting wire passes through the wire outlet, the conducting wire passes through the accommodating space and extends to the outside of the bag-shaped waterproof structure from the opening.

In one embodiment, the bag-shaped waterproof structure further includes a sealant layer. The sealant layer is disposed in the accommodating space to prevent water or moisture from entering the waterproof flexible layer from the accommodating space. Preferably, the covering member is a strip-shaped member, the accommodating space is a strip-shaped accommodating space, and a long axis of the strip-shaped accommodating space extends along the first direction. Preferably, the opening faces the first direction.

In one embodiment, the covering element comprises a welding side, and the welding side is formed by welding the covering element to the waterproof flexible layer through a welding technology. Preferably, in one embodiment, the welding technique is a thermal welding technique or an adhesive layer welding technique.

In one embodiment, the waterproof bag structure includes a plane, and the entire cover is located on the plane.

In one embodiment, the bag-shaped waterproof structure forms a strip body with a long axis direction, a strip-shaped opening is defined along the long axis direction at one side edge of the strip body, and the strip-shaped opening is sealed to form a strip-shaped sealing part. Preferably, in an embodiment, the strip-shaped sealing portion is formed by hot-pressing the strip-shaped opening portion, the strip-shaped sealing portion is formed by sealing the strip-shaped opening portion with a zipper tape, or the strip-shaped sealing portion is formed by bonding the strip-shaped opening portion. Further, the longitudinal direction of the elongated body of the bag-like waterproof structure extends in the first direction.

In one embodiment, the battery pack further includes a housing for accommodating the battery module and the bag-shaped waterproof structure.

According to an embodiment of the present invention, the waterproof flexible layer of the bag-shaped waterproof structure is a flexible material forming a bag shape, which is very convenient for assembly and has a low manufacturing cost. In addition, the covering member can cover the outlet and a part of the conductive wire, thereby preventing water from entering the waterproof flexible layer from the outlet. In one embodiment, the sealant layer is disposed in the accommodating space to prevent water from entering the waterproof flexible layer from the accommodating space. In one embodiment, since the elongated opening portion is located at one side of the bag-like waterproof structure in the longitudinal direction, the opening can be made large, the battery device can pass through the elongated opening portion more easily, and the number of assembly steps can be reduced.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention. The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of the preferred embodiments, as illustrated in the accompanying drawings.

Drawings

Fig. 1 shows a schematic view of a battery pack having a waterproof function according to a known art.

Fig. 2 shows an exploded view of a battery module according to an embodiment of the present invention.

Fig. 3 shows an exploded view of a battery pack according to an embodiment of the present invention.

Fig. 4(a) shows a schematic diagram of a battery pack in a separated state according to an embodiment of the present invention.

Fig. 4(B) shows a schematic diagram of a battery pack according to an embodiment of the present invention.

Fig. 5 shows an exploded view of a battery pack according to an embodiment of the present invention.

Reference numerals:

100: battery pack

111: shell body

112: upper cover

120: waterproof plastic layer

200: battery module

211: battery core

212: electrode plate

220: circuit board

221: long-strip-shaped opening part

231: first fixed shell

232: second fixed shell

310: conductive wire

320: bag-shaped waterproof structure

321: waterproof flexible layer

322: covering element

323: wire outlet

325: welding the side edges

331: opening of the container

332: long-strip-shaped opening part

333: strip-shaped sealing part

334: sealing glue layer

360: outer casing

361: upper casing

362: lower casing

D1: a first direction

D2: direction of long axis

Detailed Description

Fig. 2 shows an exploded view of a battery module of the present invention. As shown in fig. 2, the battery module 200 includes a plurality of battery cells 211, a plurality of electrode tabs 212, a circuit board 220, a first fixing case 231, and a second fixing case 232. The battery cells 211 are connected in series or in parallel by the electrode tabs 212. The battery cells 211 and the electrode tabs 212 are disposed inside the first fixing case 231 and fixed by the first fixing case 231, and the circuit board 220 is disposed in the accommodating space of the second fixing case 232, and the circuit board 220 is fixed to the second fixing case 232. The first fixing case 231 and the second fixing case 232 may be assembled and fixed by fixing members (not shown), such as screws, to form the entire battery module 200.

Fig. 3 shows an exploded view of a battery pack of the present invention. As shown in fig. 3, the battery pack 300 according to an embodiment of the present invention includes a battery module 200, a conductive wire 310, and a pouch-shaped waterproof structure 320. The battery module 200 includes a plurality of battery cells 211, and the battery cells 211 are electrically connected in series or in parallel with each other. The conductive wires 310 are electrically connected to the battery cells 211. The pouch-shaped waterproof structure 320 is used to accommodate the battery module 200 and includes a waterproof flexible layer 321 and a covering member 322. Waterproof flexible layer 321 defines an outlet 323, and conductive wire 310 extends through outlet 323 to the exterior of waterproof flexible layer 321. Cover 322 covers outlet 323 and a portion of conductive wire 310 to prevent water from entering the interior of waterproof flexible layer 321 from outlet 323.

Fig. 4(a) shows a schematic diagram of a battery pack in a separated state according to an embodiment of the present invention. Fig. 4(B) shows a schematic diagram of a battery pack according to an embodiment of the present invention. As shown in fig. 3, 4(a) and (B), in one embodiment, the bag-shaped waterproof structure 320 is formed as a long strip having a long axis direction D2, a long strip opening 332 is defined along the long axis direction D2 at one side of the long strip, and the long strip opening 332 is sealed to form a strip-shaped sealing portion 333.

According to the present invention, the structure and formation method of the stripe seal part 333 are not limited. For example, in one embodiment, the strip-shaped sealing portions 333 may be formed by performing a hot-pressing process on the strip-shaped openings 332. In one embodiment, the strip-shaped sealing portion 333 may be formed by sealing the strip-shaped opening portion 332 with a zipper. In addition, in an embodiment, the strip-shaped sealing portion 333 may also be formed by bonding the strip-shaped opening portion 332.

Referring again to FIG. 3, in one embodiment, the conductive wires 310 extend along a first direction D1 outside the waterproof flexible layer 321. The covering element 322 is a long strip, the covering element 322 and the waterproof flexible layer 321 define a long strip-shaped accommodating space, and a long axis of the long strip-shaped accommodating space extends along the first direction D1 and defines an opening 331. Furthermore, the conductive wires 310 pass through the wire outlets 323, then pass through the strip-shaped accommodating space, and extend from the opening to the outside of the waterproof flexible layer 321.

Referring to fig. 4(a), in an embodiment, the bag-shaped waterproof structure 320 further includes a sealant layer 334. The sealant layer 334 is disposed in the strip-shaped receiving space to prevent water from entering the waterproof flexible layer 321 from the strip-shaped receiving space. Preferably, a waterproof adhesive is injected into the strip-shaped accommodating space and then hardened to form the sealant layer 334, and the sealant layer 334 preferably fills at least half of the space of the strip-shaped accommodating space, and more preferably the sealant layer 334 fills the entire strip-shaped accommodating space, so as to enhance the waterproof function of the sealant layer 334.

In one embodiment, cover 322 includes a welding side 325, and welding side 325 is formed by welding cover 322 to flexible waterproof layer 321 by a welding technique. In this embodiment, the welding side 325 may be a U-shape. According to the present invention, the type of welding technique is not limited, for example, in one embodiment, the welding technique may be a thermal welding technique or may be an adhesive layer welding technique.

Referring to fig. 4(B), in an embodiment, the bag-shaped waterproof structure 320 includes a plane P, and the covering member 322 is entirely located on the plane P. More specifically, cover 322 does not span two planes, which increases the degree of adhesion of the weld between cover 322 and waterproof flexible layer 321, and reduces the ease of welding during manufacturing. More specifically, the welding side 325 of the covering material 322 is closely attached to the waterproof flexible layer 321.

Fig. 5 shows an exploded view of a battery pack according to an embodiment of the present invention. As shown in fig. 5, in one embodiment, the battery pack 300 further includes a housing 360, and the housing 360 defines a module accommodating space for accommodating the battery module 200 and the pouch-shaped waterproof structure 320. In the embodiment shown in fig. 5, the housing 360 includes an upper shell 361 and a lower shell 362, and the upper shell 361 and the lower shell 362 are welded together to define the module accommodating space. Preferably, the upper casing 361 and the lower casing 362 are welded in a watertight manner, so as to prevent water from entering the casing 360, thereby further enhancing the waterproof function.

In one embodiment, the interior of the waterproof flexible layer 321 of the waterproof bag structure 320 is in a vacuum state. More specifically, in order to avoid moisture remaining in the pouch-shaped waterproof structure 320; or to prevent the battery core 211 from being oxidized, when the elongated opening 221 is sealed, a small through hole is reserved after a portion thereof is sealed, and the waterproof flexible layer 321 is further vacuumized through the small through hole, and the small through hole is sealed to form the strip-shaped sealing portion 333, so that the inside of the waterproof flexible layer 321 is in a vacuum state. In one embodiment, a process of injecting nitrogen gas into the waterproof flexible layer 321 through the small through hole is also performed to prevent moisture from remaining in the waterproof flexible layer 321; or the strip-shaped sealing part 333 is formed by sealing the elongated opening 332 while preventing the oxidation of the battery cell 211.

In one embodiment, the flexible waterproof layer 321 is an antistatic material. In one embodiment, the strip-shaped opening 332 is folded and then bonded to form the strip-shaped sealing portion 333.

According to an embodiment of the present invention, the flexible waterproof layer 321 of the bag-shaped waterproof structure 320 is formed in a bag shape and is made of flexible material, so that the assembly is very convenient and the manufacturing cost is low. Further, the covering member 322 can cover the outlet 323 and a part of the conductive wire 310, thereby preventing water from entering the waterproof flexible layer 321 through the outlet 323. In one embodiment, the sealant layer 334 is disposed in the strip-shaped receiving space to prevent water from entering the waterproof flexible layer 321 from the strip-shaped receiving space. In one embodiment, since the elongated opening 332 is located at one side of the bag-like waterproof structure 320 in the longitudinal direction, the opening can be made large, the battery device can pass through the elongated opening 332 easily, and the number of assembly steps can be reduced.

Although the present invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Moreover, not all objects, advantages, or features of the present disclosure are necessarily to be achieved in any one embodiment or claimed herein. In addition, the abstract and the title are provided to assist the searching of the patent document and are not intended to limit the scope of the present invention.

Claims

1. A battery pack having a waterproof function, characterized by comprising:

a battery module including a plurality of battery cells, and the battery cells are connected in series or in parallel with each other;

a conductive wire connected to the battery cells; and

a pouch-shaped waterproof structure for accommodating the battery module and comprising:

a waterproof flexible layer having a wire outlet, the conductive wire passing through the wire outlet and extending to the outside of the waterproof flexible layer; and

a covering member covering the outlet and a portion of the conductive wire to prevent water or moisture from entering the interior of the waterproof flexible layer from the outlet.

2. The battery pack according to claim 1, wherein,

the conductive wire is outside the waterproof flexible layer and extends along a first direction,

the covering member and the waterproof flexible layer define a receiving space, the receiving space defines an opening facing the first direction, and,

the conductive wire passes through the wire outlet and then passes through the accommodating space, and extends from the opening to the outside of the waterproof flexible layer.

3. The battery pack according to claim 2, wherein the pouch-shaped waterproof structure further comprises:

a sealing adhesive layer located in the accommodating space to prevent water or moisture from entering the interior of the waterproof flexible layer from the accommodating space.

4. The battery pack according to claim 3, wherein,

the covering piece is in a long strip shape,

the accommodating space is a long strip-shaped accommodating space, and a long axis of the long strip-shaped accommodating space extends along the first direction.

5. The battery of any of claims 1-4, wherein the cover comprises a welding side, the welding side being formed by welding the cover to the waterproof flexible layer by a welding technique.

6. The battery pack according to claim 5, wherein the pouch-shaped waterproof structure includes a plane, and the cover is entirely located on the plane.

7. The battery pack according to claim 6, wherein the welding technique is a thermal welding technique or an adhesive layer welding technique.

8. The battery pack according to any one of claims 2 to 4, wherein the pouch-like waterproof structure forms an elongated body having a long axis direction, an elongated opening portion is defined in one side edge of the elongated body along the long axis direction, and the elongated opening portion is sealed to form a strip-like sealing portion.

9. The battery pack according to claim 8,

the strip-shaped sealing part is formed by the strip-shaped opening part through a hot pressing manufacturing process,

the strip-shaped sealing part is formed by closely combining the strip-shaped opening part with a chain clamping belt, or,

the strip-shaped sealing part is formed by the strip-shaped opening part in a bonding way,

wherein, the long axis direction of the long strip body of the bag-shaped waterproof structure extends along the first direction.

10. The battery pack according to any one of claims 1 to 4, further comprising a housing for accommodating the battery module and the pouch-shaped waterproof structure.