CN106784496B

CN106784496B - Battery module

Info

Publication number: CN106784496B
Application number: CN201710061258.6A
Authority: CN
Inventors: 简培伦; 江铭伟; 蔡武璋
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2017-01-25
Filing date: 2017-01-25
Publication date: 2020-03-06
Anticipated expiration: 2037-01-25
Also published as: TW201828527A; TWI623124B; CN106784496A; WO2018137259A1

Abstract

The invention discloses a battery module which comprises a plurality of batteries, two shells and two electrode plates. The two ends of the battery are respectively fixed in the shell, each shell comprises a plurality of lugs, and a plurality of air flow channels are arranged between the lugs. The electrode plates are respectively arranged between the two ends of the battery and the shell.

Description

Battery module

Technical Field

The present invention relates to a battery module.

Background

A battery module is generally formed by a large number of cells combined in series or parallel. However, the battery often generates a large amount of heat energy during the charging and discharging processes, and if the heat energy is not effectively dissipated, the temperature of the battery will rise, thereby changing the electrical characteristics of the battery. For a battery module, if the temperature difference between the batteries is too large or the operating temperature is too high, the power supply efficiency of the battery module is reduced, the overall service life is shortened, and the risk of spontaneous combustion may be caused.

Therefore, how to improve the heat dissipation efficiency of the battery module without increasing the production cost and the heat dissipation space is an important issue.

Disclosure of Invention

In order to solve the above problems, an embodiment of the present invention provides a battery module, which is convenient to be fastened and fixed to each other and ensures effective heat dissipation, and includes a plurality of batteries having opposite ends, two cases, and two electrode tabs. The two ends of the battery are respectively fixed in the shell, each shell comprises a plurality of lugs, and a plurality of first air flow channels are arranged between the lugs. The electrode plates are respectively arranged between the two ends of the battery and the shell.

In one or more embodiments of the present invention, the protrusion protrudes along a connection line between two ends of the battery.

In one or more embodiments of the present invention, the bumps are arranged in an array, and the first air channels are arranged along two different directions.

In one or more embodiments of the present invention, the bumps may be hollow structures, each bump has two openings, and the openings are disposed face to define a plurality of second air flow channels passing through the bumps.

In one or more embodiments of the present invention, the heat dissipation module further includes a plurality of heat dissipation elements respectively disposed between the electrode sheet and the housing, and a portion of the heat dissipation elements is located in the second air flow channel.

In one or more embodiments of the present invention, each heat dissipation element has heat dissipation fins, and the second air flow channel passes through gaps between the heat dissipation fins.

In one or more embodiments of the present invention, the electrode sheet has a first connection portion and a second connection portion, respectively, and the first connection portion is not coplanar with the second connection portion.

In one or more embodiments of the present invention, the housing includes a plurality of clamping portions for clamping the battery, the electrode tab has a plurality of through holes, and the clamping portions pass through the through holes.

In one or more embodiments of the present invention, the height of the clamping portion is not greater than half of the height of the battery.

In one or more embodiments of the present invention, the battery module further includes a heat dissipation base disposed between the electrode plates, the heat dissipation base includes a plurality of accommodating spaces, and the batteries are respectively located in the accommodating spaces and contact with the heat dissipation base.

In one or more embodiments of the present invention, the heat dissipation base includes at least one protrusion, and the protrusion protrudes from an outer edge of the battery.

In view of the above, in one or more embodiments of the present invention, the battery module is provided with the bump on the housing to form the first air flow channel, and the bump may have an opening to form the second air flow channel. In addition, after the battery module is selectively provided with the heat dissipation element in the shell and the heat dissipation base shell is provided with the bump to form the first air flow channel, the heat dissipation efficiency of the battery module can be greatly improved, so that the heat dissipation efficiency of the battery module is further improved.

Drawings

In order to make the aforementioned and other objects, features, and advantages of the invention, as well as others which will become apparent, reference is made to the following detailed description of the invention taken in conjunction with the accompanying drawings, in which:

fig. 1 and 2 are a perspective view and an exploded view of a battery module according to an embodiment of the present invention.

Fig. 3 is a perspective view of an embodiment of a housing of a battery module according to the present invention.

Fig. 4 is a perspective view illustrating an example of electrode tabs of a battery module according to the present invention.

Fig. 5A to 5F are schematic views of different stages of assembling a battery module according to an embodiment of the invention.

Fig. 6A and 6B are a perspective view and a side view of a battery module according to an embodiment of the invention.

Fig. 7A and 7B are an exploded view and a side view of another embodiment of a battery module according to the present invention, respectively.

Fig. 8 is an exploded view of another embodiment of a battery module according to the present invention.

Fig. 9A and 9B are a top view and a cross-sectional view of an application of the battery module of fig. 8, respectively.

Fig. 10 is an exploded view of yet another embodiment of a battery module according to the present invention.

Fig. 11 is a cross-sectional view of an application of the battery module of fig. 10.

Fig. 12 is an exploded view of yet another embodiment of a battery module according to the present invention.

Fig. 13 is a cross-sectional view of an application of the battery module of fig. 12.

Wherein the reference numerals are as follows:

100: battery module

200: battery with a battery cell

210. 220, and (2) a step of: terminal end

300. 300a, 300 b: shell body

310: bump

312: opening of the container

320. 320a, 320 b: clamping part

330: engaging part

332: clamping hook

334: clamping groove

336: screw hole

400: electrode plate

402: the first part

404: the second part

410: through hole

420: first connecting part

430: second connecting part

440: conductive structure

500: concave part

510: convex part

600: heat dissipation element

610: heat radiation fin

700a, 700b, 700 c: heat radiation base

710: containing space

720. 720a, 720 b: projecting part

1000: battery array

2000: cabinet

2002: bottom surface

2004: side surface

2010: track

2012: baffle plate

2014: wing plate

2020: heat dissipation opening

P1: first air flow passage

P2: second air flow passage

X, Y, Z: direction of rotation

Detailed Description

While the spirit of the invention will be described in detail and with reference to the drawings, those skilled in the art will understand that various changes and modifications can be made to the disclosed technology without departing from the spirit and scope of the invention.

Referring to fig. 1 and 2, a perspective view and an exploded view of a battery module according to an embodiment of the present invention are shown, respectively. The battery module 100 includes a plurality of batteries 200, two cases 300, and two electrode tabs 400. The battery 200 has opposite ends 210 and 220, and the

ends

210 and 220 of the battery 200 are the positive and negative poles of the battery 200, respectively. The plurality of cells 200 are arranged in parallel with each other, and the positive electrode and the negative electrode of each cell 200 face the same direction, respectively. For example, if one end 210 of the batteries 200 is positive, the other end 220 of the batteries 200 is negative.

The housings 300 are respectively located at both sides of the battery 200, and both ends 210, 220 of the battery 200 are respectively fixed in the two housings 300. The material of the housing 300 may be an insulating material to electrically isolate the battery 200 from the external environment. The material of the housing 300 may be thermoplastic, and the housing 300 may be manufactured by injection molding. The cases 300 located at both sides of the battery 200 have substantially the same shape, that is, the two cases 300 may be manufactured by sharing a mold. If it is necessary to identify the two cases 300, for example, to facilitate distinguishing the positive and negative polarities of the battery module 100, the two cases 300 may be made of materials with different colors, and the two cases 300 are separated by the difference in color.

The two electrode tabs 400 are respectively located between the two ends 210 and 220 of the battery 200 and the case 300, and the electrode tabs 400 respectively contact the two ends 210 and 220 of the battery 200. The electrode sheet 400 is made of a material having a low resistance and a high thermal conductivity, such as metal. The electrode sheet 400 may be manufactured by a press bending method. Since the positive and negative electrodes of both ends 210 and 220 of the battery 200 are closely contacted with the electrode tabs 400, respectively, the electrode tabs 400 may serve as common electrodes of the battery 200 to converge the positive and negative electrodes of the battery 200, and the positive and negative electrodes of the battery 200 may be connected to the outside through the electrode tabs 400.

Since the battery module 100 generates a large amount of heat during operation and the heat is concentrated at the electrodes at the two ends 210 and 220 of the battery 200, the heat generated during the operation of the battery module 100 is also accumulated on the electrode tabs 400. If the heat energy cannot be dissipated in real time, the operating temperature of the battery module 100 will be higher and higher, and the lifetime of the battery 200 will be reduced. In order to solve the heat dissipation problem, the battery module 100 has a plurality of designs for improving the heat dissipation efficiency.

The housing 300 has a plurality of bumps 310, the bumps 310 protrude along the connection line of the two ends 210, 220 of the battery 200, that is, the extending direction of the bumps 310 extends outward along the long axis direction of the battery 200. The bumps 310 have a plurality of first air flow passages P1 therebetween, and the first air flow passages P1 are continuous air flow passages, i.e., each of the first air flow passages P1 extends from one side of each of the housings 300 to the other. In some embodiments, the bumps 310 are rectangular and the bumps 310 are arranged in an array, so the first air flow channels P1 between the bumps 310 are also distributed in a grid (or a net), i.e. the first air flow channels P1 are arranged along two different directions, and a part of the first air flow channels P1 is orthogonal to the other part of the first air flow channels P1. In other embodiments, the shape of the protrusion 310 may be diamond, circular or other shapes, and the shape of the corresponding first air flow passage P1 may vary, but is continuous.

Since the continuous first air flow channel P1 is disposed adjacent to the electrode tabs 400, heat accumulated at the electrode tabs 400 can be rapidly taken away via a heat exchange effect when air flows through the first air flow channel P1, thereby improving the heat dissipation efficiency of the battery module 100. Also, since the first air flow passage P1 extends in two different directions, the flow rate of air flowing through the first air flow passage P1 can be effectively increased.

Referring to fig. 3, a perspective view of an embodiment of a housing of a battery module according to the invention is shown. The protrusion 310 of the housing 300 may further be provided with a second air flow passage P2 to further enhance the heat dissipation efficiency of the housing 300. For example, the bump 310 may be a hollow structure, and one or more openings 312 may be formed on the surface of the bump 310, so that air enters the bump 310 through the openings 312 to exchange heat with the electrode plate 400, and the air flow directly flows on the electrode plate 400, thereby achieving the purpose of heat dissipation more effectively.

In some embodiments, each of the bumps 310 has two openings 312, and the two openings 312 are respectively disposed on two opposite sides of the bump 310. The openings 312 may be disposed in a face-to-face relationship to define the second air flow path P2 through the projection 310. The openings 312 of each bump 310 may be aligned with the openings 312 of the adjacent bumps 310, so that the second air flow path P2 of the adjacent bumps 310 is also continuous. In other words, the second air flow passage P2 also extends from one side of each housing 300 to the other side. Since the second air flow passage P2 is continuous and penetrates through the protrusion 310, when the air flows through the second air flow passage P2, the air can directly exchange heat with the electrode plate 400 inside the casing 300, so as to further improve the heat dissipation efficiency of the casing 300.

In some embodiments, the housing 300 may be made of plastic with a better thermal conductivity coefficient, for example, the thermal conductivity coefficient of the plastic is greater than 2W/m-k, so that the battery 200 in the central region of the battery module 100 can also dissipate heat through the housing 300, thereby reducing the temperature difference between the batteries 200.

The case 300 includes a plurality of clamping portions 320, and the clamping portions 320 are disposed on an inner surface of the case 300 to fix the battery 200 in the case 300 using the clamping portions 320. The clamping portions 320 may be cylindrical structures (e.g., the clamping portion 320a) or elastic pieces (e.g., the clamping portion 320b), and the clamping portions 320 are spaced apart by a predetermined distance, so that the battery can be fixed in the space surrounded by the clamping portions 320.

In some embodiments, the height of the clamping portion 320, i.e. the distance that the clamping portion 320 extends from the housing 300, is not greater than half of the height of the battery, so that after the two housings 300 are engaged with each other, the clamping portions 320 in the two housings 300 do not contact each other, and therefore, the problem of low heat dissipation efficiency caused by the blockage of the gap between the batteries by the clamping portion 320 does not occur. In other words, the battery 200 is provided with the clamping portions 320 only at the two ends, the center of the battery 200 is not in contact with the clamping portions 320, and the clamping portions 320 are in partial contact with the two ends of the battery 200, so that a larger heat convection heat dissipation area can be obtained.

Each housing 300 has a plurality of engaging portions 330, the height of the engaging portion 330 is greater than the height of the clamping portion 320, the engaging portion 330 on each housing 300 has a hook 332 and a slot 334, further, the engaging portion 330 on each housing 300 forms an engaging structure with the corresponding engaging portion 330 on each housing 300, for example, as shown in fig. 3, one of the engaging portions 330 on the housing 300 on the left side of the drawing has a hook 332, and the corresponding engaging portion 330 on the housing 300 on the right side of the drawing has a slot 334, and the two housings 300 are combined by engaging the corresponding hook 332 with the slot 334. More specifically, the bottom surface of the housing 300 is rectangular, and each housing 300 includes two hooks 332 and two slots 334. In some embodiments, the two hooks 332 are disposed on two opposite corners of the housing 300, and the two slots 334 are disposed on the other two opposite corners of the housing. In other embodiments, the two hooks 332 may be disposed on a long side or a short side of the housing 300, and the two slots 334 are disposed on the other long side or the other short side. The engaging portion 330 may further have a plurality of screw holes 336, and after the two housings 300 are engaged with each other by the engaging structure, the screws may be locked in the screw holes 336 to lock the two housings 300.

Referring to fig. 4, a perspective view of an embodiment of an electrode tab of a battery module according to the present invention is shown. The electrode sheet 400 has a plurality of through holes 410, the through holes 410 may be formed by punching a metal plate, and the through holes 410 may pass through the clamping portion 320 in fig. 3. In some embodiments, the shape of the through hole 410 and the shape of the clamping portion 320 are matched, such that the inner edge of the through hole 410 contacts the clamping portion 320, thereby positioning the electrode plate 400 in the housing 300.

The electrode sheet 400 includes a first portion 402 and two second portions 404 bent from the first portion 402, wherein the first portion 402 is substantially perpendicular to the long axis direction of the battery 200. The area of the first portion 402 is larger than that of the second portion 404, and the through-hole 410 is located on the first portion 402. In some embodiments, the first portion 402 and the second portion 404 are substantially perpendicular to each other. The electrode sheet 400 has a first connection portion 420 and a second connection portion 430, and the first connection portion 420 and the second connection portion 430 are located at the first portion 402 and the second portion 404, respectively. The first connection part 420 and the second connection part 430 serve to allow the electrode tabs 400 to contact the outside, and therefore, the first connection part 420 and the second connection part 430 are respectively disposed on different planes, such as the first part 402 and the second part 404, which are perpendicular to each other, which helps to improve the flexibility of wiring of the battery module.

Fig. 5A to 5F are schematic views of different stages of assembling the battery module according to an embodiment of the invention. Fig. 5A provides a housing 300a, and the battery 200 is placed in the housing 300a, and the battery 200 can be clamped and positioned by clamping portions 320 (see fig. 3) on the housing 300a, in other words, the battery 200 is accommodated in the space between the clamping portions 320, and the battery 200 is positioned in contact with the clamping portions 320.

In the process of assembling the battery 200, the battery 200 can be directly positioned in the housing 300a without using an additional jig for fixing the battery 200. In addition, the plastic case 300a may directly serve as an insulating material and protect the battery 200 therein.

Next, in fig. 5B, the electrode tab 400 is fixed to one side of the battery 200 by using a spot welding process, such that the electrodes on the same end of the battery 200 are all in contact with the electrode tab 400, and the electrode tab 400 is used as a common positive electrode or a common negative electrode of the battery 200.

After the electrode tabs 400 are fixed to the battery 200, a plurality of conductive structures 440 are disposed on the first and

second connection parts

420 and 430 of the electrode tabs 400. In some embodiments, the conductive structure 440 may be a nut and is fixed on the first connection portion 420 and the second connection portion 430 by spot welding.

In fig. 5C, another case 300b is mounted on the other end of the battery 200. The engaging structures of the two

housings

300a, 300b are disposed correspondingly, for example, the pair of hooks 332 and slots 334 are disposed at corresponding positions of the two

housings

300a, 300b, respectively.

Then, the

cases

300a, 300b are inverted, and the upper case 300a is removed, as shown in fig. 5D, to mount another electrode tab 400 at the other end of the battery 200. The electrode tab 400 may also be fixed to the other side of the battery 200 using a spot welding process such that the electrodes of the end of the battery 200 are all in contact with the electrode tab 400, allowing the electrode tab 400 to serve as a common negative electrode or a common positive electrode of the battery 200.

second connection parts

Then, as shown in fig. 5E, the case 300a is closed back to the other end of the battery 200. As described above, since the clamping portions 320 (see fig. 3) are partially in contact with the battery 200, that is, the clamping portions 320 do not completely cover the side surfaces of the battery 200, the electrode tabs 400 are prevented from being divided by the clamping portions 320, and the continuity of the electrode tabs 400 is maintained.

When the

housings

300a and 300b are mounted, the hooks 332 are engaged with the slots 334, whereby the

housings

300a and 300b can be fixed to each other. Then, the screw 340 is locked in the screw hole 336 of the housing 300 to lock the two

housings

300a, 300b, as shown in fig. 5F. In the battery module 100, the conductive structures 440 connected to the electrode tabs 400 are exposed to the

cases

300a and 300b, so that the battery module 100 is connected to an external circuit. The conductive structures 440 of the first connection portions 420 (see fig. 4) and the conductive structures 440 of the second connection portions 430 (see fig. 4) are respectively located on different surfaces of the

housings

300a and 300b, such as the top and side surfaces of the

housings

300a and 300b, so that each electrode tab 400 (see fig. 4) can be electrically connected from two directions (i.e., top and side surfaces), thereby effectively improving the flexibility of connection of the battery module 100.

Referring to fig. 6A and 6B, a perspective view and a side view of an embodiment of the battery module of the invention are shown. A plurality of battery modules 100 may be further connected in series or in parallel to form a battery array 1000. As described above, since the two housings 300 of each battery module 100 can be made of plastic materials with different colors, the positive and negative polarities of the battery modules 100 can be easily distinguished when the battery modules 100 are connected, thereby facilitating the serial connection or the parallel connection.

In order to facilitate assembling the battery module 100 into the battery array 1000, the housing 300 of the battery module 100 has a plurality of recesses 500 and protrusions 510 (refer to fig. 5F), and the recesses 500 and the protrusions 510 are distributed on the side surface of the housing 300. The recesses 500 and the protrusions 510 are substantially elongated, and the long axis directions of the recesses 500 and the protrusions 510 are parallel to the long axis direction of the battery 200. The adjacent two battery modules 100 can be positioned by the engagement between the concave part 500 and the convex part 510 of the adjacent two battery modules 100. For example, the battery modules 100 in this embodiment are horizontally disposed in the housing 2000, the concave portions 500 and the convex portions 510 of two adjacent battery modules 100 in the long axis direction (i.e., the X direction in the figure) are matched with each other, and the battery modules 100 can be connected in series along the X direction by engaging the concave portions 500 and the convex portions 510 opposite to each other. In other embodiments, the battery modules 100 may be placed in the housing 2000 straight, or the battery modules 100 may be connected in series along the Z direction, which is not described herein again.

In some embodiments, the chassis 2000 is further optionally provided with rails 2010 for guiding the battery module 100 into the chassis 2000 and for positioning the battery module 100. For example, the rails 2010 are also arranged in a direction parallel to the X-axis, and the distance between the rails 2010 is equal to or slightly greater than the height of the battery module 100 (parallel to the long axis direction of the battery 200). The battery module 100 may be slidably inserted into the chassis 2000 and positioned between the rails 2010.

The track 2010 may include a baffle 2012 and a wing 2014 extending outwardly from the baffle 2012, wherein the baffle 2012 is upright on the bottom 2002 of the chassis 2000 and the wing 2014 is parallel to the bottom 2002 of the chassis 2000. The height of the baffle 2012, i.e., the distance between the baffle 2012 and the bottom surface 2002, is substantially equal to the width of the projection 310, such that the flaps 2014 are positioned in the first air flow path P1. As a result, the baffles 2012 position the battery module 100 in the Y direction, and the wings 2014 position the battery module 100 in the Z direction.

The housing 2000 may further include a plurality of heat dissipation openings 2020, wherein the heat dissipation openings 2020 are disposed on the bottom 2002 and the side 2004 of the housing 2000 to allow air to enter the interior of the housing 2000 through the heat dissipation openings 2020 to exchange heat with the battery module 100. In some embodiments, the heat dissipation opening 2020 extends parallel to a portion of the first air flow passage P1, and at least a portion of the heat dissipation opening 2020 is located between adjacent bumps 310, so that after air enters the case 2000 from the heat dissipation opening 2020, the heat of the battery module 100 can be dissipated through the first air flow passage P1.

As can be seen from the above embodiments, the battery module can increase the heat dissipation efficiency of the battery module by using the first air flow channel between the bumps. The shell of the battery module can be directly used as a jig for positioning the battery during assembly, so that the assembly process and the equipment cost are saved. In addition, the electrode tabs can be connected with an external circuit from the top and side surfaces of the battery module, so that the flexibility of application of the battery module is improved. In the following embodiments, features of how to further improve the heat dissipation efficiency of the battery module will be described, and the same parts as those in the foregoing embodiments will not be described again.

Referring to fig. 7A and 7B, an exploded view and a side view of another embodiment of a battery module according to the present invention are shown, respectively. In the present embodiment, the battery module 100 further includes a plurality of heat dissipation elements 600, and the heat dissipation elements 600 are disposed between the electrode tabs 400 and the housing 300. The heat dissipation member 600 may be fixed on the electrode tab 400 by a thermal conductive adhesive or solder, and physically contacts the electrode tab 400, so as to dissipate heat accumulated in the electrode tab 400 through the heat dissipation member 600.

In some embodiments, the heat dissipation elements 600 are located at two sides of the through holes 410 of the electrode plate 400, such that the through holes 410 are exposed between the heat dissipation elements 600, and the clamping portion on the housing 300 can pass through the through holes 410 through the heat dissipation elements 600. The heat dissipation device 600 includes a plurality of heat dissipation fins 610 to increase the heat exchange area between the heat dissipation device 600 and air. The material of the heat dissipation member 600 is a metal having high thermal conductivity, such as copper or aluminum. After the assembly of the battery module 100 is completed, the heat dissipation member 600 may be partially exposed to the openings 312 on the protrusions 310, so that air enters the housing 300 through the openings 312 to exchange heat with the heat dissipation member 600.

In some embodiments, the heat dissipation element 600 is disposed in cooperation with the bumps 310 on the housing 300, that is, the long axis direction of the heat dissipation element 600 is parallel to the long axis direction of the bumps 310, and the heat dissipation fins 610 on the heat dissipation element 600 are distributed in groups in the hollow bumps 310. The arrangement direction of the heat dissipation fins 610 is substantially parallel to the connection line direction of the openings 312, so that the gaps between the heat dissipation fins 610 are also parallel to the trend of the second air flow channels P2, and the second air flow channels P2 pass through the gaps between the heat dissipation fins 610.

By disposing the heat dissipation element 600 to contact the electrode tab 400, the heat accumulated in the electrode tab 400 can be dissipated through the heat dissipation element 600, and the second air flow passage P2 in the housing 300 passes through the gaps between the heat dissipation fins 610, so that the heat exchange efficiency of the heat dissipation element 600 can be greatly increased, and the heat dissipation efficiency of the battery module 100 can be further improved.

Referring to fig. 8, which is an exploded view of another embodiment of the battery module of the present invention. In the present embodiment, the battery module 100 further includes a heat dissipation base 700a, the heat dissipation base 700a is disposed between the housings 300, and the battery 200 is positioned in the heat dissipation base 700 a. The heat dissipation base 700a may be made of a metal with high thermal conductivity, and the heat dissipation base 700a has a plurality of receiving spaces 710 matching the shape of the battery 200 through a mold design. When the battery module 100 is assembled, the heat dissipation base 700a may be placed in the lower case 300, for example, on the clamping portion, and then the battery 200 may be directly placed in the receiving space 710 of the heat dissipation base 700a, and the battery 200 and the heat dissipation base 700a are in large-area contact, thereby increasing the heat dissipation efficiency of the battery module 100 and reducing the temperature difference between the batteries 200. The heat dissipation base 700a is shorter than the battery 200 and is located between the clamping portions of the case 300, so that the heat dissipation base 700a does not contact the electrode tabs 400, thereby preventing a short circuit. In addition, in the spot welding process for connecting the battery 200 and the electrode tab 400, the heat dissipation base 700a can be directly used as a positioning jig for the battery 200, thereby omitting the process steps and reducing the cost.

Referring to fig. 9A and 9B, which are a top view and a cross-sectional view of an application of the battery module of fig. 8, respectively. A plurality of battery modules 100 may be further arranged in the chassis 2000 in series or in parallel to form the battery array 1000, and the details of the arrangement of the battery modules 100 are already described in fig. 6A and 6B, and thus are not repeated. After the battery modules 100 are arranged, the heat dissipation bases 700a are substantially located in the housing 300, and the heat dissipation bases 700a of the adjacent battery modules 100 do not contact each other.

Referring to fig. 10 and 11, fig. 10 is an exploded view of another embodiment of a battery module according to the present invention, and fig. 11 is a cross-sectional view of an application of the battery module of fig. 10. In the present embodiment, the battery module 100 includes a heat dissipation base 700b, and the difference between the heat dissipation base 700b and the heat dissipation base 700a is that the heat dissipation base 700b further includes two protrusions 720 at two ends of the heat dissipation base 700b, wherein the protrusions 720 protrude from the outer edge of the battery 200. The protrusions 720 are located on the short sides of the battery modules 100 such that, when a plurality of battery modules 100 are connected together to form the battery array 1000, as shown in fig. 11, the heat dissipation bases 700b in the adjacent battery modules 100 can be in contact with each other through the protrusions 720. In some embodiments, the two side-most protrusions 720 may contact the side 2004 of the case 2000, so that the case 2000 also serves as one of the heat dissipation paths of the battery array 1000, thereby further improving the heat dissipation efficiency of the battery array 1000.

Referring to fig. 12 and 13, fig. 12 is an exploded view of a battery module according to still another embodiment of the present invention, and fig. 13 is a cross-sectional view of an application of the battery module of fig. 12. In the present embodiment, the battery module 100 includes a heat dissipation base 700c, and the difference between the heat dissipation base 700c and the heat dissipation base 700a is that the heat dissipation base 700c includes a plurality of

protrusions

720a and 720b located on the side of the heat dissipation base 700c, wherein the

protrusions

720a and 720b protrude from the outer edge of the battery 200. The protrusions 720a are located on the short sides of the battery modules 100 and the protrusions 720b are located on the long sides of the battery modules 100, so that when a plurality of battery modules 100 are connected together to form the battery array 1000, as shown in fig. 13, the heat dissipation bases 700c in the adjacent battery modules 100 may contact each other through the protrusions 720 a. In some embodiments, the two side-most protrusions 720a may contact the side 2004 of the case 2000, and the protrusions 720b contact the bottom 2002 of the case 2000, so that the case 2000 may also serve as one of the heat dissipation paths of the battery array 1000, thereby further improving the heat dissipation efficiency of the battery array 1000.

Reference is made to the following table, which shows simulation experimental data of comparative examples and different examples of a battery array composed of the battery module of the present invention.

The battery arrays of the comparative example and the first to sixth experimental examples were all three by eight, and the battery modules of the first and second experimental examples were the battery modules as shown in fig. 1, wherein the battery module of the first experimental example was placed vertically, and the battery module of the second experimental example was placed horizontally; the battery module in the third experimental example is the battery module shown in fig. 7A, and the battery module is horizontally placed; the battery module in the fourth experimental example was the battery module shown in fig. 8, and the battery module was laid horizontally; the battery module in experimental example five was the battery module shown in fig. 10, and the battery module was laid horizontally; the battery module in the sixth experimental example was the battery module shown in fig. 12, and the battery module was laid sideways. The comparative example is similar to the battery module of fig. 1, but the case does not have the projections and the battery module is laid across. The maximum temperature (Tmax) is the maximum temperature of the battery module during the simulation, and the maximum temperature difference (Δ T) is the maximum temperature difference between the batteries during the simulation.

As can be seen from the above table, the heat dissipation effect of the battery module in the transverse direction is better than the heat dissipation effect of the battery module in the vertical direction, and the heat dissipation efficiency of the battery module can be improved after the first air flow channel is formed by the bumps on the housing. After the heat dissipation element and/or the heat dissipation base are/is added into the battery module, the maximum working temperature of the battery module can be reduced, and the temperature difference among batteries can be reduced.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. A battery module, comprising:

a plurality of cells having opposite ends;

the two ends of the batteries are respectively fixed in the two shells, each shell comprises a plurality of convex blocks, the convex blocks are arranged on the opposite outer sides of the shells and protrude outwards along the connecting line direction of the two ends of the batteries, a plurality of first air flow channels are arranged between the convex blocks, the convex blocks are of hollow structures, each convex block is provided with two openings, the two openings are respectively positioned on the two opposite side surfaces of the convex block, and the two openings are arranged in a face-to-face mode so as to define a plurality of second air flow channels to pass through the convex blocks;

two electrode plates respectively arranged between two ends of the plurality of batteries and the two shells; and

and the plurality of radiating elements are respectively arranged between the two electrode plates and the two shells, and one part of the plurality of radiating elements is positioned in the plurality of second air flow channels.

2. The battery module of claim 1, wherein the plurality of bumps are arranged in an array, and the plurality of first air channels are arranged in two different directions.

3. The battery module of claim 1, wherein each of the plurality of heat dissipation members has a plurality of heat dissipation fins, and the plurality of second air flow channels pass through gaps between the plurality of heat dissipation fins.

4. The battery module of claim 1, wherein the two electrode tabs respectively have a first connecting portion and a second connecting portion, and the first connecting portion is not coplanar with the second connecting portion.

5. The battery module of claim 1, wherein each of the housings comprises a plurality of clamping portions to clamp the plurality of batteries, each of the electrode tabs has a plurality of through-holes, and the plurality of clamping portions pass through the plurality of through-holes.

6. The battery module of claim 5, wherein a height of the plurality of clips is no greater than half of a height of the plurality of cells.

7. The battery module of claim 1, further comprising a heat sink base disposed between the two electrode tabs, the heat sink base comprising a plurality of receiving spaces, the plurality of batteries being respectively disposed in the plurality of receiving spaces and contacting the heat sink base.

8. The battery module of claim 7, wherein the heat sink base comprises at least one protrusion protruding from an outer edge of the plurality of cells.