CN212967867U

CN212967867U - Battery box body and battery box

Info

Publication number: CN212967867U
Application number: CN202021702414.6U
Authority: CN
Inventors: 郭军; 李华; 徐超
Original assignee: Beijing CHJ Automobile Technology Co Ltd
Current assignee: Beijing CHJ Automobile Technology Co Ltd
Priority date: 2020-08-14
Filing date: 2020-08-14
Publication date: 2021-04-13
Anticipated expiration: 2030-08-14

Abstract

The present disclosure relates to a battery box body and a battery box, the battery box body comprises an upper cover (10), a frame (20) and a cold plate (31), the frame (20) has a first end and a second end which are oppositely arranged, the first end of the frame (20) has a first opening, the second end of the frame (20) has a second opening, the upper cover (10) seals the first opening, the cold plate (31) seals the second opening, and an accommodating space is formed between the upper cover (10) and the cold plate (31); the cold plate (31) is provided with a cold liquid channel (34), and the cold liquid channel (34) is positioned outside the accommodating space. In the scheme of this disclosure, the cold drawing is direct to participate in the sealed of battery box body for the cooling effect obtains obviously promoting, will carry the cold liquid passageway setting at the accommodation space outside at cold night, thereby makes the accommodation space of battery box body keep apart with cold liquid passageway completely, has reduced the condition of cold night inflow damage inside battery module in the accommodation space.

Description

Battery box body and battery box

Technical Field

The utility model relates to a power battery technical field especially relates to a battery box body and battery box.

Background

The battery box is an important part of the electric automobile, and the performance and the safety of the battery box play an important role in the whole electric automobile. The existing battery box structure arranges a liquid cooling system and a power battery module in a lower box body, and a liquid cooling plate is paved on the lower surface of the battery module to form a sealed waterway system.

The battery module and the liquid cooling system of the battery box in the prior art are usually in a cabin, along with the operation of a vehicle, the vibration is increased, and if the liquid cooling system leaks, the battery module is soaked by cooling liquid to harm the personal safety and the vehicle safety. Therefore, the liquid cooling system of the battery box in the prior art has a lower sealing and blocking effect relative to the battery module, and needs to be improved.

Disclosure of Invention

The utility model aims at providing a battery box body and battery box to solve among the prior art problem that the coolant liquid leaked to damaging battery module in the battery box body.

In order to achieve the above object, the present disclosure first provides a battery box body, including an upper cover, a frame, and a cold plate, where the frame has a first end and a second end that are oppositely disposed, the first end of the frame has a first opening, the second end of the frame has a second opening, the upper cover seals the first opening, the cold plate seals the second opening, and a receiving space is formed between the upper cover and the cold plate;

the cold plate is provided with a cold liquid channel, and the cold liquid channel is positioned outside the accommodating space.

In some embodiments, the battery box body further comprises a flow channel plate connected to the cold plate and forming the cold liquid channel with the cold plate.

In some embodiments, the battery case body further includes a shield connected to the frame and pressing an edge of the cold plate.

In some embodiments, the second opening of the frame has a stepped recess in which the edge of the cold plate is located.

In some embodiments, the cold plate is flush with an end face of the second end of the frame, and the shield simultaneously compresses the cold plate and the frame.

In some embodiments, the flow field plate has a gap with the shield plate.

In some embodiments, the gap is filled with heat insulation cotton.

In some embodiments, the guard plate is formed with a protrusion facing the runner plate.

In some embodiments, the cold plate is joined to the frame by a friction stir welding process, a hot melt self-tapping joining process, or a process or an adhesive process.

This disclosed another aspect provides a battery box, includes battery module and this disclosure provides's battery box body, battery module set up in accommodation space.

Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:

the cold drawing is direct to participate in the sealed of battery box body for the cooling effect obtains obviously promoting, will carry the cold liquid passageway setting at the accommodation space outside at cold night moreover, thereby makes the accommodation space of battery box body keep apart with cold liquid passageway completely, has reduced the condition of cold night inflow damage inside battery module in the accommodation space.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a perspective view of a battery box in an embodiment of the present disclosure;

FIG. 2 is an exploded view of the battery box of FIG. 1;

FIG. 3 is a plan view of a battery box in an embodiment of the present disclosure;

FIG. 4 is a cross-sectional view A-A of the battery case of FIG. 3;

FIG. 5 is a partial schematic view of FIG. 4 at section A;

fig. 6 is a partial schematic view of fig. 4 at section B.

In the figure, the position of the upper end of the main shaft,

10-upper cover;

20-a frame; 21-a step groove; 22-a first end; 23-a second end;

31-cold plate; 32-flow channel plate; 33-guard board; 34-a cold liquid channel; 35-a protected space;

40-battery module.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

Referring to fig. 1 to 4, the present embodiment provides a battery box body, including an upper cover 10, a frame 20, and a cold plate 31, where the frame 20 has a first end 22 and a second end 23 disposed opposite to each other, the first end 22 of the frame 20 has a first opening, the second end 23 of the frame 20 has a second opening, the upper cover 10 seals the first opening, the cold plate 31 seals the second opening, and an accommodating space is formed between the upper cover 10 and the cold plate 31; the cold plate 31 has a cold fluid passage 34 therein, and the cold fluid passage 34 is located outside the receiving space.

The cold liquid channel 34 is a channel through which cold liquid flows, and the cold liquid exchanges heat with the battery module in the accommodating space through the cold plate 31 in the channel, so that the effect of reducing the temperature of the battery module 40 is achieved.

In the above scheme, since the cold plate 31 directly seals the second opening of the frame 20, the cold plate 31 forms an inner wall of the accommodating space, so that the battery module in the accommodating space can be directly disposed on the cold plate 31, and the cooling effect is obviously improved; further, the cold liquid passageway 34 that will carry the cold night sets up in the accommodation space outside to make the accommodation space of battery box body and cold liquid passageway 34 keep apart completely, reduced the condition of cold night inflow damage inside battery module in the accommodation space.

In some embodiments, the frame 20 may be surrounded by a frame having a width that may be designed according to the size of the battery module to be received. The first end 22 and the second end 23 of the frame 20 may be provided with screw holes or the like to facilitate connection with the upper cover 10 or other components. The sealing connection of the upper cover 10 to the frame 20 may be achieved by providing a wire thread bushing in the solid of the frame 20, the wire thread bushing connecting the upper cover 10.

The cold fluid passage 34 may be a separate tube, and the cold fluid passage 34 may be an internal passage of the tube, and the tube may be welded to the cold plate 31 and located outside the receiving space. The cold liquid channel 34 may also be formed by a flow channel plate, and specifically, the battery box body further includes a flow channel plate 32, and the flow channel plate 32 is connected to the cold plate 31 and forms the cold liquid channel 34 with the cold plate 31. Since the cold liquid channel 34 is located outside the receiving space, it is apparent that the runner plate 32 is also located outside the receiving space.

In some embodiments, referring to fig. 5 in combination, the battery box body further comprises a shield 33, wherein the shield 33 is connected to the frame 20 and presses against the edge of the cold plate 31. The edge of the cold plate 31 is extruded by the guard plate 33, so that the cold plate 31 is not easy to fall off or leak, and the sealing stability of the cold plate 31 is further ensured. The guard plate 33 can also protect the cold liquid channel 34, so that the damage to the cold liquid channel 34 caused by the outside is avoided, and the possibility of cold liquid leakage is reduced. The protective plate 33 serves to preserve heat, reduce the amount of heat exchange between the flow channel plate 32 and the outside, and increase the amount of heat exchange with the battery module 40. In the present embodiment, if the cold fluid channel 34 is formed by the flow field plate 32 and the cold plate 31, the protector plate 33 mainly serves to protect the flow field plate 32 from damage by the flow field plate 32.

Specifically, the shield 33 may be connected to the frame 20 by removable connectors such as screws, bolts, etc. to facilitate installation and maintenance.

In one particular embodiment, referring to FIG. 5 in combination, the second opening of the frame 20 has a step recess 21, and the edge of the cold plate 31 is located within the step recess 21. The overall shape of the step groove 21 is annular, the size and the shape of the step groove are matched with those of the cold plate 31, the step groove 21 is arranged, the installation position of the cold plate 31 is limited, the installation efficiency is improved, the installation position is more accurate and uniform, in addition, the step groove 21 is arranged, so that the adhesive can be conveniently applied, and good sealing can be formed between the cold plate 31 and the frame 20.

Further, as shown in fig. 5, in this embodiment, the cold plate 31 may be flush with the end surface of the second end 23 of the frame 20, and the edge of the protective plate 33 simultaneously presses the cold plate 31 and the frame 20, that is, in the process of installing the protective plate 33, as the preload of the protective plate 33 and the frame 20 increases, a part of the pressure of the protective plate 33 will act on the cold plate 31, and the cold plate 31 further presses the frame 20, thereby ensuring the connection tightness and the sealing stability of the cold plate 31 and the frame 20.

The arrangement of the cold plate 31 flush with the end face of the second end of the frame 20 may be implemented by: the depth of the step groove 21 is equal to the thickness of the cold plate 31, so that the cold plate 31 can be flush with the lower end surface of the frame 20 after the cold plate 31 is placed in the step groove 21. Wherein the cold plate 31 and the frame 20 may be joined together by a Friction Stir Welding (FSW) process or a hot melt self-tapping (FDS) process or an adhesive process. To further increase the sealing performance, the lower surfaces of the shield 33 and the cold plate 31 may also be provided with a sealant. The thickness of the cold plate 31 may also be slightly greater than the depth of the step groove 21, so that a portion of the cold plate 31 is exposed from the step groove 21, and after the protective plate 33 is connected to the frame 20, a greater pressure may be applied to the cold plate 31, thereby further improving the sealing property between the cold plate 31 and the frame 20.

The friction stir welding process comprises the following steps: the method is a method for welding by using heat generated by friction of a contact surface of a workpiece as a heat source to enable the workpiece to generate plastic deformation under the action of pressure;

the gluing process comprises the following steps: the sealing structure glue has the functions of bonding and sealing;

the hot melting self-tapping connection process comprises the following steps: is a thermal connection technology, and is characterized in that: the screw thread has a sealing function;

the high-speed nail shooting connection process comprises the following steps: the technology is characterized in that a piston firing pin is accelerated by compressed air, and the rivet is impacted by the maximum force of 20kN, so that the rivet is pressed into a workpiece at the speed of 20-40 m/s. Due to the inertia effect, the rivet can realize the connection of the sheet metal parts under the condition of not causing the deformation of the whole parts.

In one embodiment, referring to FIG. 5, the edge of the flow field plate 32 extends to the interface between the cold plate 31 and the shield 33, such that the flow field plate 32 contacts the shield 33 and the shield 33 supports and/or compresses the flow field plate 32. Therefore, the edge of the flow path plate 32 is restricted by the protector plate 33, and the problem of seal failure such as cracking or lifting is not likely to occur. The protecting plate 33 has an inclined surface, the inclined surface and the cold plate 31 have a certain included angle, the included angle is smaller than 90 degrees, the top of the inclined surface is the boundary position of the cold plate 31 and the protecting plate 33, and the protecting plate 33 supports and/or extrudes the flow passage plate 32 through the inclined surface. The protector plate 33 may also form a stepped surface for supporting the flow field plate 32, thereby better ensuring the sealing between the flow field plate 32 and the cold plate 31.

In one embodiment, a shielding space 35 is formed between the shield 33 and the cold plate 31, the flow field plate 32 is located in the shielding space 35, and a gap is formed between the flow field plate 32 and the shield 33. The gap has a buffer protection function, and when the guard plate 33 is subjected to external impact force, the gap can deform slightly without contacting the internal runner plate 32, so that most of the impact force is absorbed by the guard plate 33, and the possibility of damage to the runner plate 32 is reduced. When the battery box body is used for a long time and has a problem of cracking or sealing failure at the edge of the flow channel plate 32, cold liquid preferentially enters the protective space 35, and the cold liquid enters the accommodating space of the battery box body and needs to pass through the sealing surface between the edge of the cold plate 31 and the protective plate 33 and the step sealing surface between the cold plate 31 and the step groove 21, the two surfaces are not at the same height position, and the probability that the cooling liquid passes through the two sealing surfaces is very small.

In some embodiments, the gap may be filled with thermal insulation cotton, which may support the cold plate 31 and the runner plate 32, and improve the thermal management effect.

Wherein the guard plate 33 is detachably connected to the frame 20 for later maintenance. The detachable connection mode can be bolt connection, rivet connection, clamping groove buckling connection and the like.

In a specific embodiment, the protector plate 33 is formed with a projection toward the flow field plate 32. Providing the protector plate 33 with protrusions can enhance the structural strength of the protector plate 33.

The cold liquid channel 34 formed between the flow channel plate 32 and the cold plate 31 is located on the flow channel plate 32, the cold plate 31 is a whole flat plate, the flow channel plate 32 is provided with a recessed cold liquid channel 34, part of the plate surface of the flow channel plate 32 is attached to the cold plate 31, and the plate surface at the position of the cold liquid channel 34 is separated from the cold plate 31. The projections of the partial shield 33 can press against the flow field plate 32 at locations where the cold liquid channel 34 is not provided, so that the arrangement can increase the supporting force of the shield 33 in the central area, and thus, the shield can protect the cold liquid channel 34. Referring to fig. 6, in some embodiments, the protrusions on the partial protection plate 33 may also have a predetermined buffer gap with the position of the flow channel plate 32 where the cold liquid channel 34 is not located, and when the external environment collides with the protection plate 33, the buffer gap is only reduced if the collision amplitude is small, but the gap still exists, and if the collision amplitude is large, the protrusions on the protection plate 33 contact the flow channel plate 32, and the flow channel plate 32 supports the protection plate 33. Since the support is located without the cold liquid channel 34, the runner plate 32 is not damaged.

The flow channel plate 32 can be formed by stamping, and the structure formed by the flow channel plate 32 and the cold plate 31 is similar to a harmonica tube structure; the protector plate 33 may be formed by punching. The cold fluid channel 34 has at least one inlet and at least one outlet, and the cold fluid enters the cold fluid channel 34 through the inlet and then flows out of the outlet after sufficient heat exchange is performed on the cold plates 31. The cold liquid can be recycled after being cooled.

Referring to fig. 3, in some embodiments, the inlet and the outlet of the cold liquid channel 34 are both disposed outside the accommodating space, so that the accommodating space has no connection interface, the reliability of leakage in the accommodating space is reduced, and the stability of sealing is improved.

In one particular embodiment, the frame 20 has a hollow configuration and the cold plate 31 is flat in shape. The frame 20 is designed to be a hollow structure, so that the weight of the battery box body can be reduced, and the frame 20 can be formed by welding sectional materials.

With reference to fig. 2, the present embodiment further provides a battery box, which includes a battery module 40 and the battery box body provided in the present embodiment, wherein the battery module 40 is disposed in the accommodating space. The battery module 40 may be directly disposed on the cold plate 31, and in order to increase the heat transfer rate, heat conductive silicon may be disposed between the cold plate 31 and the battery module 40 to increase the heat transfer rate. Through the battery box body that adopts this embodiment, realized battery module and coolant liquid independent sealing (battery module is located accommodation space, and the coolant liquid is located cold liquid passageway 34), effectual solved battery module because of the coolant liquid leaks to lead to the insulating security of battery module to lose, takes place the safety problem on fire even.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery box body, characterized by comprising an upper cover (10), a frame (20) and a cold plate (31), wherein the frame (20) is provided with a first end (22) and a second end (23) which are oppositely arranged, the first end (22) of the frame (20) is provided with a first opening, the second end (23) of the frame (20) is provided with a second opening, the upper cover (10) seals the first opening, the cold plate (31) seals the second opening, and an accommodating space is formed between the upper cover (10) and the cold plate (31);

the cold plate (31) is provided with a cold liquid channel (34), and the cold liquid channel (34) is positioned outside the accommodating space.

2. The battery box body according to claim 1, further comprising a flow channel plate (32), wherein the flow channel plate (32) is connected to the cold plate (31) and forms the cold liquid channel (34) with the cold plate (31).

3. The battery box body according to claim 2, further comprising a guard plate (33), wherein the guard plate (33) is connected to the frame (20) and presses an edge of the cold plate (31).

4. The battery box body according to claim 3, wherein the second opening of the frame (20) has a stepped groove (21), and an edge of the cold plate (31) is located in the stepped groove (21).

5. Battery box body according to claim 4, characterised in that the cold plate (31) is flush with the end face of the second end (23) of the frame (20), the apron (33) forming a compression of the cold plate (31) and the frame (20) simultaneously.

6. The battery box body according to claim 3, wherein a gap is provided between the flow channel plate (32) and the protector plate (33).

7. The battery box body as claimed in claim 6, wherein the gap is filled with heat insulation cotton.

8. The battery case body according to claim 3, wherein the protector plate (33) is formed with a projection toward the flow channel plate (32).

9. The battery box body according to claim 1, characterized in that the cold plate (31) is connected to the frame (20) by a friction stir welding process, a hot-melt self-tapping connection process or a process or an adhesive process.

10. A battery box, characterized in that, comprises a battery module (40) and a battery box body according to any one of claims 1-9, the battery module (40) is arranged in the accommodating space.