CN214043864U

CN214043864U - Battery pack box

Info

Publication number: CN214043864U
Application number: CN202022877892.7U
Authority: CN
Inventors: 王清华; 王英喆; 戴�峰
Original assignee: Bafang Electric Suzhou Co Ltd
Current assignee: Bafang Electric Suzhou Co Ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-08-24
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a battery pack box, including casing, end cover, group battery, the group battery sets up inside the casing, the end cover is used for sealing the casing the battery pack box outside sets up anodal, the negative pole of battery pack box, the group battery with anodal, negative pole circuit connection, wherein the group battery with soak insulating heat-conducting medium between the space of casing, end cover, the casing surface is provided with a plurality of recesses, the recess is in the corresponding arch of casing internal surface formation. The utility model adopts the mode that the gaps among the battery pack, the shell and the end cover are fully filled with the insulating heat-conducting medium, so that the battery pack can uniformly dissipate heat, and the service life of the battery pack is prolonged; through set up a plurality of recesses at the casing surface, further enlarged the area of contact of casing with the air, the radiating effect is good has reduced the volume of battery box simultaneously, and the product miniaturization degree is high, simple structure, with low costs.

Description

Battery pack box

Technical Field

The utility model relates to a battery heat dissipation field, concretely relates to battery pack box.

Background

Along with the improvement of living standard, consumers put forward higher requirements on the performance of the electric power-assisted bicycle, and one of the requirements is embodied in the heat dissipation performance of the battery pack of the electric power-assisted bicycle. The group battery provides power for electric power bicycle, needs the group battery to provide comparatively powerful power for power bicycle when the user faces environment such as climbing, and this just leads to the group battery can produce great discharge current, makes the group battery temperature rise, influences the life of group battery.

In order to solve the problems, in the prior art, one mode is to reduce the temperature of the battery pack by adopting a natural air heat dissipation mode, but the effect is not ideal due to low air heat conductivity; one is that the wave-shaped liquid cooling pipe is jointed on the surface of the battery pack, but the jointing effect of the wave-shaped liquid cooling pipe and each battery in the battery pack is different, so that the heat dissipation of the battery is not uniform, and the service life of the battery is reduced; the other is to adopt the mode of circulating liquid cooling to dispel the heat to the group battery, but this mode needs to cooperate water pump, water tank to use together, and the structure is complicated, with high costs, is not suitable for the limited situation in space.

SUMMERY OF THE UTILITY MODEL

In order to overcome the aforementioned problem that exists among the prior art, the utility model provides a battery pack box can promote the radiating effect of group battery, makes the battery in the group battery evenly dispel the heat, and the high structure complexity, with low costs that reduce simultaneously of product miniaturization degree.

Based on the above purpose, the technical scheme of the utility model is as follows:

the utility model provides a battery pack box, battery pack box includes casing, end cover and group battery, the group battery sets up inside the casing, the end cover is used for sealing the casing battery pack box outside sets up the positive pole and the negative pole of battery pack box, the group battery with positive pole, negative pole electricity are connected, wherein the group battery with soak insulating heat-conducting medium between the space of casing, end cover, the casing surface is provided with a plurality of recesses, the recess is in the corresponding arch of casing internal surface formation.

Wherein at least one surface of the housing is provided with at least two grooves having the same length, width and depth, respectively. The long edge of the groove is parallel to any edge of the surface of the shell where the groove is located.

Wherein, the casing is cuboid or square.

In order to further increase the heat dissipation area of the shell, grooves are formed in each surface of the shell. Each surface of the shell is provided with a first groove and a second groove, the length, the width and the depth of the first groove are the same as those of the second groove, and the long edge of the first groove is parallel to the long edge of the second groove.

Furthermore, the shell is made of aluminum.

Further, the insulating heat-conducting medium is transformer oil.

Still further, the battery pack case may be used for an electric power-assisted bicycle.

The utility model discloses following beneficial effect has:

the utility model adopts the mode that the gaps among the battery pack, the shell and the end cover are fully filled with the insulating heat-conducting medium, so that the battery pack can uniformly dissipate heat, and the service life of the battery pack is prolonged; through set up a plurality of recesses at the casing surface, further enlarged the area of contact of casing with the air, the radiating effect is good has reduced the volume of battery box simultaneously, and the product miniaturization degree is high, is particularly useful for the limited situation of installation space, simple structure, with low costs.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

Certain embodiments of the invention will hereinafter be described in detail by way of example and not limitation with reference to the accompanying drawings, in which like references indicate similar or analogous elements or parts, and it will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:

fig. 1(a) - (c) are schematic structural diagrams of a battery box of the present invention, wherein fig. 1(a) is a schematic perspective view of the battery box, fig. 1(b) is a schematic sectional view of fig. 1(a), and fig. 1(c) is a schematic perspective view of another battery box;

fig. 2(a) - (d) are schematic structural diagrams of the first embodiment of the present invention in which the grooves are disposed on the outer surface of the housing, wherein fig. 2(a) and 2(b) are schematic structural diagrams of the first groove and the second groove disposed at the middle position of the outer surface of the housing when the long edge of the first groove is parallel to the edge of the housing; FIG. 2(c) is a diagram showing the situation where the first groove and the second groove are randomly arranged when the long side of the first groove is parallel to the edge of the surface of the housing where the first groove is located; FIG. 2(d) is a view showing the case where the long side of the first groove is not parallel to the edge of the surface of the housing;

fig. 3(a) - (d) are schematic structural diagrams illustrating the grooves disposed on the outer surface of the housing according to the second embodiment of the present invention, wherein fig. 3(a) and 3(b) are schematic structural diagrams illustrating the third groove and the fourth groove disposed at the middle position of the outer surface of the housing when the long side of the third groove is parallel to the edge of the outer surface of the housing; FIG. 3(c) is a diagram showing the situation where the third groove and the fourth groove are randomly arranged when the long side of the third groove is parallel to the edge of the surface of the housing where the third groove is located; fig. 3(d) shows the case where the long side of the third groove is not parallel to the edge of the surface of the housing where the third groove is located.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be embodied in many other forms different from those described herein, and it will be apparent to those skilled in the art that similar modifications may be made without departing from the spirit of the invention, and it is therefore intended that the invention not be limited to the specific embodiments disclosed below.

As shown in fig. 1(a) -1(b), a battery pack case 1 includes a housing 10, a battery pack 30, and end caps (not shown), wherein the battery pack 30 is composed of a first battery cell 301 and a second battery cell 302, the battery pack 30 is disposed inside the housing 10, and the upper and lower surfaces of the housing 10 are hermetically connected by the end caps. The positive and negative electrodes (not shown) of the battery box 1 are disposed on the outer side of the battery box 1, and the battery pack 30 is electrically connected to the positive and negative electrodes of the battery box 1 to transmit electric current. The insulating heat-conducting medium 40 is fully soaked between the battery pack 30 and gaps of the casing 10 and the end covers for uniform heat dissipation of the battery pack 30, wherein the insulating heat-conducting medium 40 is fully filled in the inner gap of the battery pack box 1, so that the first battery cell 301 and the second battery cell 302 in the battery pack 30 can be fully contacted with the insulating heat-conducting medium 40, and a uniform heat dissipation effect is achieved.

As shown in fig. 1(a), for further promoting the heat dissipation effect of battery pack case 1, reduce the volume of battery pack case simultaneously, do benefit to the product miniaturization, make the utility model discloses a battery pack case is particularly useful for the narrow and small situation of installation space, has set up a plurality of recesses on the surface of casing 10, and can understand, the recess forms corresponding arch at the casing internal surface.

The present invention is not particularly limited in the arrangement and number of the grooves 20 on the outer surface of the housing 10, and for example, two, three, or four grooves may be provided on each outer surface of the housing 10; it is also possible to provide the groove 20 only on a certain outer surface of the housing 10, and exemplarily, as shown in fig. 1(c), the groove 20 is provided on each surface of the housing 10. The specific number and arrangement mode of the grooves can be individually designed according to the actual production requirement of the battery pack box. It should be understood that the housing 10 of the present invention may have various shapes, such as a cube, a rectangular parallelepiped, etc., and the following description will be made by taking the housing 10 as a cube or a rectangular parallelepiped.

Example 1:

when the housing 10 is in the shape of a cube, description will be made taking as an example two grooves provided on each surface of the housing 10:

each outer surface of the housing 10 is provided with a first groove 201 and a second groove 202, wherein the length, the width and the depth of the first groove 201 are the same as those of the second groove 202, and the long sides of the first groove 201 are parallel to the long sides of the second groove 202.

As shown in fig. 2(a) -2(c), when the long side of the first groove 201 is parallel to the edge of the outer surface of the housing where the first groove is located, the long side of the second groove 202 is also parallel to the edge of the outer surface of the housing where the second groove is located, wherein the lengths of the long sides of the first groove 201 and the second groove 202 are the same as the length of the edge of the surface of the housing where the first groove 201 and the second groove 202 are located. In fig. 2(a) and 2(b), the first groove 201 and the second groove 202 are disposed at the middle position of the surface of the housing where the two grooves are located; fig. 2(c) shows the situation where the first grooves 201 and the second grooves 202 are randomly arranged.

It is understood that when the long side of the first groove 201 is not parallel to the edge of the housing surface, the long side of the second groove 202 is not parallel to the edge of the housing surface, as shown in fig. 2 (d). In this embodiment, the upper and lower opposite surfaces of the housing 10 are end caps (not shown), and the end caps are hermetically connected to the housing 10.

Example 2:

when the housing 10 has a rectangular parallelepiped structure, two grooves are provided on each surface of the housing 10 for explanation:

a third groove 203 and a fourth groove 204 are disposed on each outer surface of the housing 10, wherein the length, width and depth of the third groove 203 are the same as those of the fourth groove 204, and the long sides of the third groove 203 and the fourth groove 204 are parallel to each other.

As shown in fig. 3(a) -3(c), when the long side of the third groove 203 is parallel to the edge of the outer surface of the housing where it is located, the long side of the fourth groove 204 is also parallel to the edge of the outer surface of the housing where it is located. In fig. 3(a), the lengths of the long sides of the third groove 203 and the fourth groove 204 are the same as the lengths of the long sides of the housing surfaces, and the third groove 203 and the fourth groove 204 are disposed in the middle of the housing surfaces. In fig. 3(b) and 3(c), the third grooves 203 and the fourth grooves 204 are randomly arranged.

It will be understood that when the long side of the third groove 203 is not parallel to the edge of the housing surface, the long side of the fourth groove 204 is not parallel to the edge of the housing surface, as shown in fig. 3 (d).

Further, the utility model provides an insulating heat-conducting medium 40 is transformer oil, and it has big, the high, the good characteristics of thermal conductivity of dielectric strength than the heat capacity, can absorb the group battery 30 in a large number and discharge the heat that produces, avoid the short circuit risk of firing of group battery when lightening the moisture and corroding, improve the security of group battery.

Further, the utility model discloses well casing 10's material is aluminium, and its heat conductivility is good, has promoted the radiating effect of group battery.

Adopt the utility model discloses beneficial effect example of scheme is as follows: with prior art's scheme and the utility model discloses a contrast test is carried out to the scheme, wherein, the utility model discloses only lie in with prior art's difference: 1. the insulating heat-conducting medium in the prior art is air, and the insulating heat-conducting medium of the utility model is transformer oil; 2. the casing surface of battery pack case among the prior art is not provided with the recess and corresponds the arch, the utility model discloses in all be provided with first, second recess on each surface of battery pack case casing, and first, second recess form corresponding arch at the internal surface of casing.

The battery packs in the two pairs of proportions adopt the same specification, namely adopt 28 batteries, and the arrangement mode is as follows: the 14 batteries are connected in series to form a string, the string is formed by the batteries, the first battery in the first string and the first battery in the second string are connected in parallel, the battery pack to be tested is obtained by analogy, the two pairs of proportions are placed in a constant temperature box at 40 ℃, a charging and discharging electrical cabinet is simultaneously opened, the two pairs of proportions are discharged by the current of 14A, the temperature of each distribution point in the battery pack in the two pairs of proportions is read by a temperature acquisition instrument, and the test is stopped until the discharging is stopped (30min) or the discharging temperature protection threshold (65 ℃), namely the temperature is higher than 65 ℃.

In which three battery packs were tested in each comparative example in order to ensure the objectivity of the experimental results.

In the prior art, the experimental results of three battery packs are as follows: the discharge time of the three battery boxes is 15 minutes, 18 minutes and 19 minutes respectively, and the discharge temperature protection threshold (65 ℃) of the battery is reached.

The utility model discloses in the scheme, the experimental result of three battery pack case as follows: the discharge time of the three battery box is more than 30 minutes, and the discharge temperature threshold (more than 65 ℃) of the battery is not reached yet, after discharging for 30 minutes, the temperature of each point of the battery in the three battery boxes is read by using a temperature acquisition instrument, the highest temperature is 62.7 ℃, and the highest temperature is less than the discharge temperature protection threshold (65 ℃) of the battery.

It can be understood that the utility model discloses a battery pack case is not specifically restricted to its application scope, and is exemplary, can use in the electric power assisted bicycle field.

The utility model adopts the mode that the gaps among the battery pack, the shell and the end cover are fully filled with the insulating heat-conducting medium, so that the battery pack can uniformly dissipate heat, and the service life of the battery pack is prolonged; through setting up a plurality of recesses at the casing surface, further enlarged the area of contact of casing with the air, the volume of battery pack case has been dwindled simultaneously to the radiating effect good, and the product miniaturization degree is high, is particularly useful for the narrow and small condition of installation space, simple structure, with low costs.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. The utility model provides a battery pack box, battery pack box includes casing, end cover and group battery, the group battery sets up inside the casing, the end cover is used for sealing the casing battery pack box outside sets up the anodal and the negative pole of battery pack box, the group battery with anodal, negative pole electrical connection, its characterized in that the group battery with soak insulating heat-conducting medium between the space of casing, end cover, the casing surface is provided with a plurality of recesses, the recess is in corresponding arch is formed to the casing internal surface.

2. The battery pack case according to claim 1, wherein at least one surface of the case is provided with at least two grooves having the same length, width and depth, respectively.

3. The battery pack case as claimed in claim 2, wherein the groove has a long side parallel to any one of the edges of the surface of the case where the groove is formed.

4. The battery pack case according to claim 1, wherein the case is a rectangular parallelepiped or a square.

5. The battery pack case according to claim 2, wherein each surface of the housing is provided with a groove.

6. The battery pack case according to claim 5, wherein a first groove and a second groove are provided on each surface of the housing, the length, width and depth of the first groove are the same as those of the second groove, and the long side of the first groove and the long side of the second groove are parallel to each other.

7. The battery pack case according to any one of claims 1 to 6, wherein the case is made of aluminum.

8. The battery pack according to any one of claims 1 to 6, wherein the insulating heat transfer medium is transformer oil.

9. The battery pack according to any one of claims 1 to 6, wherein the battery pack is usable for an electric power-assisted bicycle.