CN113113718A

CN113113718A - Battery box and electric vehicle

Info

Publication number: CN113113718A
Application number: CN201911344805.7A
Authority: CN
Inventors: 席兵荣; 李笑笑; 王明旺; 王华文
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Sunwoda Electric Vehicle Battery Co Ltd
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2021-07-13

Abstract

The invention relates to a battery box and an electric automobile, wherein the battery box comprises a battery module, a cooling device and a box body, the cooling device comprises a cooling pipe and a cooling pipe joint, and two ends of the cooling pipe are hermetically connected with the cooling pipe joint; a module accommodating bin and a joint accommodating bin are arranged in the box body, and the module accommodating bin is isolated from the joint accommodating bin; the battery module is arranged in the module accommodating bin; the cooling pipe joint penetrates through the box body, part of the cooling pipe joint is arranged on the outer side of the box body, and part of the cooling pipe joint is arranged in the joint accommodating bin. The cooling device of this disclosure does not have the risk of brazing part coolant liquid seepage, and simultaneously, the cooling tube is few with the position of being connected of cooling tube joint in this disclosure, and the position of being connected is isolated with the battery module, can effectively avoid the position of being connected to take place the influence of coolant liquid seepage, and to a great extent has improved the security and the stability of battery box.

Description

Battery box and electric vehicle

Technical Field

The disclosure relates to the field of power battery manufacturing, in particular to a battery box and an electric vehicle.

Background

The power battery can generate a large amount of heat during operation, and the heat of the power battery needs to be dissipated by a cooling device so as to ensure the stability and the safety of the power battery. At present, the battery pack generally uses two modes of liquid cooling and air cooling to dissipate heat, and the liquid cooling heat dissipation mostly adopts a liquid cooling plate to dissipate heat of the battery module. The liquid cooling plate is generally manufactured by an aluminum extrusion forming method, a brazing mode is adopted at the joint of the aluminum plate, the brazing area of the liquid cooling plate in the battery pack manufactured by the mode is large, the problem of leakage of cooling liquid is easy to occur, meanwhile, the connecting parts of the cooling device in the battery box are more, and the connecting parts also have the problems of leakage of the cooling liquid and higher potential safety hazards.

Disclosure of Invention

The purpose of this disclosure is to provide a battery box and electric vehicle, the battery box can effectively reduce the risk of the inside coolant liquid seepage of battery box.

In order to achieve the above object, a first aspect of the present disclosure discloses a battery box including:

a battery module;

a cooling device for cooling the battery module; and the number of the first and second groups,

a case accommodating the battery module and the cooling device;

the cooling device comprises a cooling pipe and a cooling pipe joint, and two ends of the cooling pipe are hermetically connected with the cooling pipe joint; a module accommodating bin and a joint accommodating bin are arranged in the box body, and the module accommodating bin is isolated from the joint accommodating bin; the battery module is arranged in the module accommodating bin; the cooling pipe joint penetrates through the box body, part of the cooling pipe joint is arranged on the outer side of the box body, and part of the cooling pipe joint is arranged in the joint accommodating bin.

Optionally, the battery box comprises at least a pair of the cooling pipe joints, the cooling pipe joints comprising a port and at least one interface,

optionally, the port is located outside the box, the interface is located in the joint accommodating bin, and the port is communicated with the interface.

Optionally, the cooling tube is integrally formed and includes a liquid inlet and a liquid outlet.

Optionally, the liquid inlet is connected with one of the interfaces of one of the cooling pipe joints in a sealing manner, and the liquid outlet is connected with one of the interfaces of the other cooling pipe joint in a sealing manner.

Optionally, the cooling pipe is at least partially bent and extended to form a cooling part.

Optionally, the liquid inlet and the liquid outlet are provided with clamping parts.

Optionally, the cooling device further comprises a cooling tube pressing block, and the cooling tube pressing block covers the clamping portion.

Optionally, at least one layer of battery module is arranged in the module accommodating bin, and one cooling pipe is correspondingly arranged below each layer of battery module.

Optionally, the battery module further comprises a heat conducting plate and a heat conducting pad, wherein the heat conducting plate is arranged above the cooling pipe, the heat conducting pad is arranged above the heat conducting plate, and the battery module is arranged above the heat conducting pad.

Optionally, the heat conducting pad is a heat conducting silica gel pad.

Optionally, the battery module holds and sets up the multilayer in the storehouse battery module, adjacent two-layer among the battery module, be located the upper strata the battery module passes through the support to be fixed and is located the lower floor the top of battery module.

Optionally, the support includes a connecting portion and a supporting portion, the connecting portion connects and fixes two adjacent layers of the battery modules, and the supporting portion supports the cooling tube, the heat-conducting plate, the heat-conducting pad and the upper layer of the battery modules.

A second aspect of the present disclosure provides an electric vehicle including the battery box provided in the first aspect of the present disclosure.

Through above-mentioned technical scheme, this disclosure uses the cooling device that cooling tube and cooling tube connect constitute to replace traditional cooling device, and whole cooling device does not have the part of brazing, does not have the risk of cold brazing part but the liquid seepage, and simultaneously, the cooling tube is less with the position of being connected of cooling tube joint in this disclosure, and the position of connecting is isolated with the position of placing the battery module, even the coolant seepage takes place for the connecting position, also can effectively avoid the influence to liquid to the battery module, and to a great extent has improved the security and the stability of battery box.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic view of a battery box structure of a single-layer battery module.

Fig. 2 is a schematic structural view of a battery box cooling device of a single-layer battery module.

Fig. 3 is an exploded view of a battery case cooling device of a single-layered battery module.

Fig. 4 is a schematic view of a battery box structure of a double-layer battery module.

Fig. 5 is a schematic structural view of a battery box cooling apparatus of a double-layer battery module.

Fig. 6 is an exploded view of a battery case cooling device of a double-layered battery module.

Description of the reference numerals

1 Battery Module 2 Cooling device

21 cooling pipe 211 first cooling pipe

212 second cooling tube 22 cooling tube joint

221 first cooling coupling 222 second cooling coupling

23 liquid inlet and 24 liquid outlet

25 port 26 interface

27 cooling section 28 briquette

29 clamping part 3 box

31 module accommodating bin 32 joint accommodating bin

4 battery module unit 41 first battery module unit

42 second battery module unit 5 heat-conducting plate

6 heat conducting pad 7 support

71 connecting part 72 support part

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "upper, lower, left, right" generally means "above", "below", "left", "right" based on a particular component referred to in the drawings, unless otherwise specified. "inner and outer" refer to "inner" and "outer" based on the particular components referred to in the drawings. "distal and proximal" refer to the distance from a particular element in the drawings.

As shown in fig. 1 to 6, a first aspect of the present disclosure provides a battery case including: the battery module 1 is used for providing electric energy for the whole battery box; the cooling device 2 is used for cooling the battery module 1 and ensuring the normal work of the battery module; and a case 3 for placing and protecting the battery module 1 and the cooling device 2.

The cooling device 2 comprises a cooling pipe 21 and a cooling pipe connection 22. The cooling tube 21 is integrally formed, and has only one liquid inlet 23 and one liquid outlet 24, and no branch exists, and the liquid inlet 23 and the liquid outlet 24 of the cooling tube 21 are both provided with clamping portions 29. The cooling pipe 21 is at least partially bent to form a cooling part 27, and the cooling part 27 is responsible for cooling the battery module. The liquid inlet 23 and the liquid outlet 24 of the cooling pipe 21 are hermetically connected with the cooling pipe joint 22. The cooling pipe 21 is arranged in the box body 3 and is responsible for cooling the battery module, and the cooling pipe joint 22 is hermetically connected with the cooling pipe 21 and a cooling system outside the box body 3.

The cooling coupling 22 has a port 25 and at least one port 26, with the port 25 communicating with each port 26. The entire cooling pipe joint 22 penetrates the tank 3, partly outside the tank 3 and partly inside the tank 3. Specifically, the port 25 of the cooling pipe joint 22 is partially disposed outside the tank 3, and the port 26 is partially disposed inside the tank 3. The port 25 is connected to a cooling system outside the tank 3, and the port 26 is hermetically connected to the liquid inlet 23 or the liquid outlet 24 of the cooling pipe 21 inside the tank 3.

The cooling device 2 further comprises a cooling pipe pressing block 28, and the cooling pipe pressing block 28 covers and presses the joint of the cooling pipe 21 and the cooling pipe joint 22 to improve the sealing performance of the cooling pipe 21 and the cooling pipe joint 22. As an embodiment of the present disclosure, the cooling tube pressing block 28 is U-shaped and has an opening, and the opening of the cooling tube pressing block 28 is clamped above the clamping portion 29 and fixed to the box body 3 by screws. After being fixed with the box body 3, the cooling pipe pressing block 28 can downwards extrude the clamping part 29, so that the cooling pipe 21 and the cooling pipe joint 22 are pressed, and the sealing performance of the cooling pipe pressing block and the cooling pipe joint is improved.

Set up the module in the box 3 and hold storehouse 31 and connect and hold storehouse 32, both keep apart each other, and battery module 1 is placed inside the module holds storehouse 31, and the connecting portion of cooling tube 21 and cooling tube joint 22 then sets up in connecting and holding storehouse 32. When the liquid leakage phenomenon appears in the connecting portion of cooling tube 21 and cooling tube joint 22, the coolant liquid will collect in connecting and holding the storehouse 32, can not get into the module and hold the storehouse 31 in, prevent that the coolant liquid from causing the damage to battery module 1, improve the stability and the security of whole battery box.

The present disclosure provides a battery box with at least one cooling pipe 21 and at least one pair of cooling pipe joints 22, wherein the pair of cooling pipe joints 22 comprises a first cooling pipe joint 221 and a second cooling pipe joint 222. The first cooling pipe joint 221 guides the cooling fluid into the cooling pipe 21, and the second cooling pipe joint 222 guides the cooling fluid in the cooling pipe 21 out to the external cooling system. Each cooling pipe joint 22 has a port 25 and at least one port 26, the number of the ports 26 can be set according to the number of the cooling pipes 21 in the box body 3, the liquid inlet 23 of each cooling pipe 21 is hermetically connected with one port 26 of the first cooling pipe joint 221 in the pair of cooling pipe joints 22, the liquid outlet 24 is hermetically connected with one port 26 of the second cooling pipe joint 222 in the pair of cooling pipe joints 22, so as to form cooling flow channels of the cooling pipe joint 22, the cooling pipe 21 and the cooling pipe joint 22, and each cooling flow channel is corresponding to one layer of battery modules 1 to be cooled.

The module holds and is provided with one deck battery module 1 at least in the storehouse 32, each layer battery module 1 is a battery module unit 4, each battery module unit 4 is equipped with a cooling tube 21 and cools it, still be provided with heat-conducting plate 5 and heat conduction pad 6 between each cooling tube 21 and each battery module unit 4, heat-conducting plate 5 sets up in the cooling portion 27 top of liquid cooling pipe 21, heat conduction pad 6 sets up in heat-conducting plate 5 top, with battery module unit 4 direct contact.

The heat transfer plate 5 is a flat plate having good thermal conductivity, and can increase the contact area between the battery module 1 and the cooling pipe 21. The heat conduction pad 6 is made by the heat conduction material that has deformability, prefers heat conduction silica gel, because battery module 1 bottom surface is not a plane, and it is inhomogeneous to lead to the cooling effect with heat-conducting plate 5 contact is inhomogeneous, influences battery module's work. The heat conducting pad 6 has deformation capability, so that the bottom surface of the battery module 1 can be ensured to be in uniform contact with the heat conducting pad 6, and the phenomenon of uneven cooling is prevented. The heat conduction pad 6 can be designed into the big heat conduction pad that matches with the heat-conducting plate 5 size and directly lay on the heat-conducting plate 5 or lay the position corresponding with battery module 1 on the heat-conducting plate 5 with the little heat conduction pad that the battery module 1 size matches, selects for use the latter design in the embodiment of this disclosure, can reduce the volume of heat conduction pad 6, reduction in production cost.

The manner of cooperation between the cooling device 2 and the battery module units 4 will be further described in two cases, in which only one battery module unit 4 and a plurality of battery module units 4 are disposed in the module accommodating chamber 32.

As shown in fig. 1 to 3, when only one battery module unit 4 is provided in the module housing compartment 32, only one cooling pipe 21 and a pair of cooling pipe joints 22 are provided in the case 3, each cooling pipe joint 22 including one port 25 and one interface 26. The cooling portion 27 of the cooling tube 21 is directly disposed at the bottom of the module accommodating chamber 32, i.e., the bottom of the case 3, and the heat conducting plate 5 and the heat conducting pad 6 are sequentially disposed on the cooling tube 21, and the battery module 1 is correspondingly disposed on the heat conducting pad 6 and fixed. The liquid inlet 23 of the cooling pipe 21 is hermetically connected with the interface 26 of the first cooling pipe joint 221 and is pressed and fixed through the cooling pipe pressing block 28, and the liquid outlet 24 is hermetically connected with the interface 26 of the second cooling pipe joint 222 and is pressed and fixed through the cooling pipe pressing block 28. The coolant in the external cooling system flows in from the port 25 of the first cooling pipe joint 221, cools the battery module 1 while passing through the cooling portion 27, then flows out through the port 25 of the second cooling pipe joint 222, returns to the external cooling system, and completes cooling of the battery module unit 4.

When only a plurality of battery module units 4 are provided in the module accommodating chamber 32, a plurality of cooling pipes 21 are provided in the case 3, and the number of the cooling pipes 21 is the same as the number of the battery module units 4. The cooling coupling 22 includes a port 25 and at least one interface 26. The cooling pipe joints 22 can be arranged in one or more pairs according to actual requirements: when the cooling pipe joints 22 are arranged in a pair, the number of the interfaces 26 arranged on each cooling pipe joint 22 is equal and is consistent with the number of the cooling pipes 21; when cooling pipe joints 22 are arranged in multiple pairs, the number of ports 26 on one cooling pipe joint 22 in each pair of cooling pipe joints 22 should be equal to the number of ports 26 on the other cooling pipe joint 22, and the total number of ports 26 should be twice the number of cooling pipes 21.

As shown in fig. 4 to 6, there is provided an embodiment of a double-layered battery module unit 4, the battery module unit 4 including a first battery module unit 41 and a second battery module unit 42. In the present embodiment, a pair of cooling pipe joints 22 is adopted: two cooling pipes 21 and a pair of cooling pipe joints 22 are arranged in the box body 3, the cooling pipes 21 comprise first cooling pipes 211 and second cooling pipes 212, and each cooling pipe joint 22 comprises a port 25 and two interfaces 26. The cooling portion 27 of the first cooling tube 211 is directly disposed at the bottom of the module accommodating chamber 32, i.e., the bottom of the case 3, and the heat conducting plate 5 and the heat conducting pad 6 are sequentially disposed on the cooling portion 27, and the battery module 1 of the first battery module unit 41 is correspondingly disposed on the heat conducting pad 6 and fixed, thereby fixing the first battery module unit 41. The liquid inlet 23 of the first cooling pipe 211 is hermetically connected with one interface 26 of the first cooling pipe joint 221 and is pressed and fixed through the cooling pipe pressing block 28, and the liquid outlet 24 of the first cooling pipe 211 is hermetically connected with one interface 26 of the second cooling pipe joint 222 and is pressed and fixed through the cooling pipe pressing block 28.

The bracket 7 is provided above the first battery module unit 41 to support the second cooling pipe 212. The bracket 7 includes a connecting portion 71 and a supporting portion 72, and the connecting portion 71 is fixedly connected to an end plate of the battery module 1 in the first battery module unit 41 to fix the bracket 7 to the first battery module unit 41. The shape of the support portion 72 is matched with the cooling portion 27 of the second cooling pipe 212 to support the cooling portion 27 of the second cooling pipe 212, the heat conductive plate 5 and the heat conductive pad 6 are sequentially laid on the upper side of the cooling portion 27 of the second cooling pipe 212, and the battery modules 1 of the second battery module unit 42 are correspondingly placed on the heat conductive pad 6 and fixed, thereby completing the fixation of the second battery module unit 42. The liquid inlet 23 of the second cooling pipe 212 is hermetically connected with the remaining interface 26 of the first cooling pipe joint 221 and is pressed and fixed through the cooling pipe pressing block 28, and the liquid outlet 24 is hermetically connected with the remaining interface 26 of the second cooling pipe joint 222 and is pressed and fixed through the cooling pipe pressing block 28. The coolant in the external cooling system flows in from the port 25 of the first cooling pipe joint 221, enters the first cooling pipe 211 and the second cooling pipe 212, passes through the cooling portions 27 of the two cooling pipes 21, cools the first battery module unit 41 and the second battery module unit 42, merges at the second cooling pipe joint 222, flows out from the port 25 of the second cooling pipe joint 222, returns to the external cooling system, and completes cooling of the battery module unit 4.

A second aspect of the present disclosure provides an electric vehicle including the battery box disclosed in the first aspect of the present disclosure.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. For example, it is possible to change a double-layered battery module unit to a multi-layered battery module unit and to change a pair of cooling pipe joints 22 to a plurality of pairs of cooling pipe joints.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. A battery box, comprising:

a battery module;

a case accommodating the battery module and the cooling device;

2. The battery box of claim 1, wherein the battery box includes at least a pair of the cooling tube connectors, the cooling tube connectors including a port and at least one interface.

3. The battery box of claim 2, wherein the port is located outside the box body, the port is located within the connector receiving bay, and the port communicates with the port.

4. The battery box of claim 3, wherein the cooling tube is integrally formed and includes an inlet port and an outlet port.

5. The battery box of claim 4, wherein the inlet port is sealingly connected to one of the ports of one of the cooling tube connectors, and the outlet port is sealingly connected to one of the ports of another of the cooling tube connectors.

6. The battery box according to claim 1, wherein the cooling pipe is at least partially bent and extended to form a cooling portion.

7. The battery box according to claim 4, wherein clamping portions are respectively arranged around the liquid inlet and the liquid outlet.

8. The battery box according to claim 7, characterized in that the cooling device further comprises a cooling tube press block that is pressed over the snap-in portion.

9. The battery box according to claim 1, wherein at least one layer of the battery modules is arranged in the module accommodating bin, and one cooling pipe is correspondingly arranged below each layer of the battery modules.

10. The battery box according to claim 9, further comprising a heat conductive plate disposed above the cooling tube and a heat conductive pad disposed above the heat conductive plate, the battery module being disposed above the heat conductive pad.

11. The battery box of claim 10, wherein the thermal pad is a thermally conductive silicone pad.

12. The battery box according to claim 9, wherein a plurality of layers of the battery modules are arranged in the battery module accommodating bin, and the battery module on the upper layer is fixed above the battery module on the lower layer by a bracket in two adjacent layers of the battery modules.

13. The battery box according to claim 12, wherein the bracket includes a connecting portion that connects and fixes the adjacent two layers of the battery modules, and a supporting portion that supports the cooling pipe, the heat conductive plate, the heat conductive pad, and the battery modules located at an upper layer.

14. An electric vehicle comprising the battery box according to any one of claims 1 to 13.