CN213366706U

CN213366706U - Battery pack

Info

Publication number: CN213366706U
Application number: CN202021586449.8U
Authority: CN
Inventors: 王志强; 刘安龙; 徐鹏; 韩海滨
Original assignee: Guangzhou Xiaopeng Automobile Manufacturing Co Ltd
Current assignee: Guangzhou Xiaopeng Automobile Manufacturing Co Ltd
Priority date: 2020-08-03
Filing date: 2020-08-03
Publication date: 2021-06-04
Anticipated expiration: 2030-08-03

Abstract

The present application relates to a battery pack. The battery pack comprises a battery pack box body, a battery module and a battery pack dehumidifying device, wherein the battery module is arranged in the battery pack box body; the battery pack dehumidifying device comprises a condenser arranged in the battery pack box body; the battery pack box is internally provided with a drainage structure connected with the condenser, and the drainage structure is communicated with the outside of the battery pack box. The scheme that this application provided can effectively reduce the humidity of battery package box.

Description

Battery pack

Technical Field

The application relates to the technical field of new energy, in particular to a battery pack.

Background

The electric automobile as a new energy automobile has the advantages of energy conservation and environmental protection, and is more and more a hot spot for research in the automobile field. The power battery is one of the main international power development directions of the electric automobile as the power energy of the electric automobile.

In the related art, although the sealing grade of the power battery assembly is higher and higher, air is inevitably introduced into the battery pack. In addition, the power battery assembly is generally provided with an explosion-proof vent valve for balancing the air pressure inside and outside the battery pack, and when the battery pack is in an environment with higher temperature and humidity, wet air can enter the battery pack through the explosion-proof vent valve. Therefore, in the power battery assembly in the related art, when the ambient humidity is high, the air humidity inside the battery pack is also correspondingly increased, and when the ambient temperature changes greatly, condensation is easily generated inside the box body of the power battery assembly. In addition, if the temperature of the battery is high, condensation may also form on the surface of the thermal management member after the cooling function of the battery assembly is activated, and when the condensation accumulates to a large extent, the risk of failure of the battery assembly may increase. In the related art, some battery packs are dehumidified by installing water-absorbing materials, but if the battery packs are in a high-temperature and high-humidity environment for a long time, the water-absorbing capacity of the water-absorbing materials tends to be saturated, and the humidity in the battery packs is still difficult to be effectively reduced.

Therefore, when the battery pack of the related art is exposed to a high-temperature and high-humidity environment for a long time, the high humidity inside the battery pack may affect the performance of the battery assembly.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problems in the prior art, the battery pack can effectively reduce the humidity in the battery pack box body.

The embodiment of the application provides a battery pack, include the battery pack box, locate battery module in the battery pack box and locate be used for reducing the battery pack dehydrating unit of box inner space humidity in the battery pack box.

Further, the battery pack dehumidifying device comprises a condenser arranged in the battery pack box body;

the battery pack box is internally provided with a drainage structure connected with the condenser, and the drainage structure is communicated with the outside of the battery pack box.

Further, a mounting seat for mounting the condenser is arranged in the battery pack box body;

the drainage structure comprises a liquid collecting groove arranged on the mounting seat, and the condenser is fixed in the liquid collecting groove;

and a drainage hole is formed in the liquid collecting tank and is communicated with the outside of the battery pack box body through a drainage tube.

Further, the condenser comprises at least one condensing plate which is spaced apart along the horizontal direction, and the at least one condensing plate is vertically fixed to the liquid collecting tank respectively.

Further, the condenser is arranged in an integrated mode, a flow guide structure is arranged on the condenser, and the flow guide structure extends to the flow guide structure.

Furthermore, the flow guide structure is arranged on the condenser in a sawtooth shape or a wavy shape.

Furthermore, the diversion structure that cockscomb structure or wavy setting are in the condenser both sides form a plurality of recesses, a plurality of recesses are in the both sides evenly distributed of condenser just extend to the collecting tank.

Further, a humidity sensor is arranged in the battery pack box body;

the battery pack dehumidifying device further comprises a controller configured to control the condenser to be turned on or off according to the humidity in the battery pack box sensed by the humidity sensor.

Furthermore, an explosion-proof vent valve is arranged on the battery pack box body, and comprises an outer vent end positioned on the outer side of the battery pack box body and an inner vent end positioned on the inner side of the battery pack box body; the humidity sensor and/or the condenser are/is arranged in the area, close to the inner ventilation end of the explosion-proof ventilation valve, in the battery pack box body.

Furthermore, the condenser is arranged in an area opposite to the inner ventilation end of the explosion-proof ventilation valve, and the humidity sensor is arranged between the explosion-proof ventilation valve and the condenser.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the scheme provided by the embodiment, the battery pack comprises a battery pack box body, a battery module arranged in the battery pack box body and a battery pack dehumidifying device arranged in the battery pack box body and used for reducing the humidity of the internal space of the box body. After setting up like this, battery package dehydrating unit can dehumidify the inner space of battery package box, enables the battery module in the battery package box and is in safe, dry operational environment, has guaranteed the stability of battery package performance.

In some embodiments, the battery pack dehumidification device comprises a condenser mounted within the battery pack enclosure; the battery pack box is internally provided with a drainage structure connected with the condenser, and the drainage structure is communicated with the outside of the battery pack box. After setting up like this, the condenser can be liquid water with the steam condensation in the battery package box to reduce the humidity in the battery package box, the drainage structure can be in real time with the liquid water discharge that the condenser produced, can avoid the battery assembly to splash because of liquid water and cause the risk of short circuit.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The foregoing and other objects, features and advantages of the application will be apparent from the following more particular descriptions of exemplary embodiments of the application, as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the application.

Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

FIG. 2 is a perspective view of the battery pack of FIG. 1 assembled with a dehumidification device;

FIG. 3 is a top view of the battery pack of FIG. 1 with the dehumidification device assembled;

FIG. 4 is a schematic diagram of the dehumidification apparatus of FIG. 2;

FIG. 5 is a schematic diagram of a dehumidifier according to another embodiment of the present application;

fig. 6 is a top view of the dehumidifying apparatus of fig. 5.

Detailed Description

Preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms "first," "second," "third," etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be considered limiting of the present application.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The application provides a battery package can effectively reduce the humidity of battery package box internal.

The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 4, the battery pack provided in this embodiment includes a battery pack case 10, a battery module disposed in the battery pack case 10, and a battery pack dehumidifying device disposed in the battery pack case 10 for reducing humidity of an internal space of the battery pack case, where the dehumidifying device is configured to reduce humidity of the internal space of the battery pack case 10, so as to keep air in the battery pack dry.

In one implementation, the battery pack dehumidification device includes a condenser 12 mounted within the battery pack enclosure 10. After the condenser 12 is started, the temperature of the surface of the condenser 12 can be rapidly reduced, and the water vapor in the battery pack case 10 can be condensed into liquid water on the condenser 12, so that the humidity in the battery pack case 10 is rapidly reduced.

In one implementation mode, a drainage structure matched with the condenser 12 is further arranged in the battery pack box body 10, and the drainage structure is communicated with the outside of the battery pack box body 10 through a drainage pipe 15. The drainage structure can drain the liquid water generated by the condenser 12 in real time, so that the air humidity in the battery pack box body 10 cannot rise secondarily due to the fact that the liquid water generated by the condenser 12 stays for a long time in the battery pack box body 10; in addition, the drainage structure can prevent the accumulation and the splashing of liquid water in the battery pack box body 10, and can avoid the risk of short circuit caused by the splashing of the liquid water of the battery assembly.

Referring to fig. 4, in one implementation, a mounting seat 13 for mounting a condenser 12 is provided in the battery pack case 10, the drainage structure includes a liquid collecting tank 131 provided on the mounting seat 13, and one end of the condenser 12 is fixed to the liquid collecting tank 131. In this embodiment, the condenser 12 is fixedly installed in the battery pack case 10 through the installation seat 13, the liquid collecting tank 131 is opened on the upper surface of the installation seat 13, and the liquid collecting tank 131 has a bottom surface arranged along the horizontal direction and a side edge extending upward from the periphery of the bottom surface. The condenser 12 is arranged along the vertical direction, the lower end of the condenser 12 is fixed in the middle of the liquid collecting tank 131, the outer wall of the condenser 12 is connected with the bottom surface of the liquid collecting tank 131, and liquid water generated on the condenser 12 can flow downwards along the outer wall of the condenser 12 and can be collected into the liquid collecting tank 131.

In this embodiment, the drainage hole 133 is vertically opened on the bottom surface of the liquid collecting tank 131, and the drainage hole 133 is communicated with the outside of the battery pack case 10 through the drainage tube 15. In one implementation, the drainage holes 133 may be provided in one side region of the bottom surface of the sump 131, and the condenser 12 is installed in the other side region of the bottom surface. The flow guide part 132 can be arranged around the drainage hole 133, the flow guide part 132 is provided with a flow guide inclined plane with the height lower than the bottom surface of the liquid collecting groove 131, the drainage hole 133 is positioned at the bottom of the flow guide inclined plane, water in the liquid collecting groove 131 can flow to the flow guide part after accumulating and then flows into the drainage hole 133 after flowing through the flow guide inclined plane, the flow guide part 132 can enable the water in the liquid collecting groove 131 to be discharged through the drainage hole 133 more easily, and liquid water can be prevented from accumulating at the bottom surface of the liquid collecting groove 131.

In this embodiment, a humidity sensor 14 is installed in the battery pack case 10. The humidity sensor 14, the condenser 12 and the battery management system are electrically connected. The battery Management system is also called bms (battery Management system), and a controller in the battery Management system can switch the operation state of the condenser 12 according to the humidity information collected by the humidity sensor 14. The humidity sensor 14 may measure the humidity of the air inside the battery pack case 10 in real time and send the humidity information to the battery management system. A threshold value can be set for the humidity in the battery pack box 10, the humidity sensor 14 sends the measured humidity information to the battery management system, the battery management system controls the condenser 12 to start when the humidity in the battery pack box 10 exceeds the preset threshold value, after the condenser 12 is started, the surface temperature of the condenser 12 rapidly drops, and water vapor in the battery pack box 10 can be condensed into liquid water on the condenser 12, so that the humidity in the battery pack box 10 is rapidly reduced; when the humidity within the battery pack case 10 drops to or below a preset threshold, the condenser 12 is turned off. Through the arrangement, the condenser 12 can be automatically started or closed according to the humidity change in the battery pack box body 10, so that the humidity in the battery pack box body 10 can be kept within a set range, the humidity in the battery pack box body 10 can be accurately controlled, the humidity in the battery pack box body 10 is always kept within an allowable range, the battery in the battery pack box body 10 is in a safe and dry working environment, and the stability of the performance of the battery pack is ensured.

In this embodiment, the battery pack case 10 is provided with the explosion-proof vent valve 11, and the explosion-proof vent valve 11 can keep the internal and external air pressures of the battery pack balanced through the internal and external exchange of air. When the battery pack is in an environment with high humidity, wet air can enter the battery pack through the anti-explosion vent valve 11, which can result in the humidity in the battery pack increasing. In this embodiment, by arranging the condenser 12 and the drainage structure in the battery pack case 10, the problem that the humidity in the battery pack is easily increased due to the arrangement of the explosion-proof ventilation valve 11 can be avoided, and the humidity in the battery pack can be kept stable.

The explosion-proof vent valve 11 is assembled in the battery pack case 10, and has an outer vent end located outside the battery pack case 10 and an inner vent end located inside the battery pack case 10. The humidity sensor 14 and/or the condenser 12 can be installed in the battery pack case 10 near the inner ventilation end of the explosion-proof ventilation valve 11; alternatively, the condenser 12 may be installed at a position horizontally opposite to the inner ventilation end of the explosion-proof ventilation valve 11, and the humidity sensor 14 may be installed between the explosion-proof ventilation valve 11 and the condenser 12. When the battery pack is in a high-temperature and high-humidity environment, the humidity change of the area of the air permeable region in the battery pack box body 10 close to the anti-explosion vent valve 11 is most obvious, after the humidity change is set, the humidity sensor 14 can detect the humidity change information in the battery pack box body 10 more quickly, the starting of the condenser 12 can be controlled more accurately, the condenser 12 can also condense the humid air in the battery pack box body more effectively, and the dehumidification efficiency of the battery pack dehumidification device can be improved.

It is understood that in some other embodiments, the condenser 12 and the humidity sensor 14 may be mounted in other areas inside the battery pack case 10 besides the above-mentioned mounting areas, and the present application is not limited thereto.

In the related art, generally, a water absorbing material is arranged in a battery pack for dehumidification, and if the battery pack is in a high-temperature and high-humidity environment for a long time, the water absorbing capacity of the water absorbing material tends to be saturated, so that the humidity in the battery pack is difficult to be continuously controlled. The battery pack that this embodiment provided, the dehydrating unit of inside setting can be based on the humidity information automatic start condenser 12 that humidity transducer 14 detected and dehumidify, and the liquid hydroenergy that condenser 12 produced is outside real-time discharge battery pack box 10, even if the battery pack lasts work for a long time in the environment of high temperature and high humidity like this, also enables the humidity in the battery pack and keeps in controllable within range, enables the better severe operating mode environment that is applicable to of battery pack that this embodiment provided.

Referring to fig. 1, 2 and 4, in one implementation, the battery pack case 10 includes a lower case 101 and an upper case 102 assembled as a whole, the lower case 101 has a bottom wall 111 and four side walls 121 vertically connected to the bottom wall 111, and the bottom wall 111 and the four side walls 121 define a cavity for mounting a battery module. The dehumidification device is installed in the cavity at battery module place, and explosion-proof breather valve 11 is installed in the lateral wall 121 of box 101 under the battery package, can be fixed in the diapire 111 of box 101 down with the mount pad 13 of condenser 12, and drainage tube 15 can vertically run through in diapire 111. When the battery pack is assembled, the bottom surface of the liquid collecting groove 131 is kept horizontal, and the liquid water guided from the condenser 12 to the liquid collecting groove 131 flows to the drainage holes 133 along the bottom surface of the liquid collecting groove 131 and is discharged to the outside of the battery pack case 10 through the drainage tube 15.

FIG. 4 is a schematic diagram of the dehumidification apparatus of FIG. 2; referring to fig. 2 and 4, in one implementation, the condenser 12 includes at least one condensation plate 122 spaced apart in a horizontal direction, when the number of the condensation plates 122 is plural, the plurality of condensation plates 122 are vertically fixed to the sump 131 on the mounting seat 13, respectively, and the plurality of condensation plates 122 may be arranged along the same horizontal line in the sump 131. In this embodiment, the liquid collection tank 131 is substantially rectangular, the condensation plate 122 can be arranged at intervals along the long side direction of the rectangle in the liquid collection tank 131, the surface of the condensation plate 122 can be parallel to the length direction of the liquid collection tank 131, and the width of the liquid collection tank 131 can be greater than the thickness of the condensation plate 122. After the arrangement, the liquid water on the two side surfaces of the condensing plate 122 can be completely converged to the liquid collecting tank 131, and the connection part between the condensing plate 122 and the liquid collecting tank 131 can reduce the obstruction to the flow of the liquid water in the liquid collecting tank 131, so that the liquid water in the liquid collecting tank 131 can be more smoothly converged to the drainage hole 133; in addition, the plurality of condensation plates 122 have a large contact area with the air, and the dehumidification efficiency may be improved.

FIG. 5 is a schematic diagram of a dehumidifier according to another embodiment of the present application; fig. 6 is a top view of the dehumidifying apparatus of fig. 5.

Referring to fig. 5 and 6, in some other embodiments, the condenser 12 may be integrally disposed and have a zigzag or wavy structure, and the zigzag or wavy structure forms a flow guide structure having a flow guide function. After the arrangement, on one hand, the zigzag or wavy structure forms a plurality of grooves 123 which extend longitudinally and are arranged alternately in the horizontal direction on the surface of the condenser 12, the grooves 123 are connected to the liquid collecting tank 131, the grooves 123 have the functions of collecting liquid and guiding flow on the condenser, and the condensed water generated on the surface of the condenser 12 can be quickly collected in the grooves 123 and guided to the liquid collecting tank 131; on the other hand, the flow guiding structure on the condenser 12 can increase the surface area of the condenser 12, so as to increase the contact area with the air in the battery pack box 10, and can improve the condensation efficiency, thereby improving the dehumidification speed.

It is understood that in other embodiments, besides the condenser 12 with the above structure, other known condensers with other structures can be used, and the present application is not limited thereto.

In this embodiment, condenser 12, drainage structure and water conservancy diversion structure set up in battery package box 10 cooperatedly, and the effect of quick dehumidification can be realized to such setting, can discharge the liquid water that produces in the battery package box 10 in real time, can effectively avoid producing the condensation on the module surface of battery package inside, high pressure or the low pressure electrical component, has guaranteed the stability of battery package performance.

The aspects of the present application have been described in detail hereinabove with reference to the accompanying drawings.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A battery pack, comprising:

the battery pack dehumidifying device is arranged in the battery pack box body and is used for reducing the humidity of the internal space of the box body;

the battery pack dehumidifying device comprises a condenser arranged in the battery pack box body;

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

the battery pack box body is internally provided with a mounting seat for mounting the condenser;

the drainage structure comprises a liquid collecting groove arranged on the mounting seat, and the condenser is fixed in the liquid collecting groove; and a drainage hole is formed in the liquid collecting tank and is communicated with the outside of the battery pack box body through a drainage tube.

3. The battery pack according to claim 2, wherein:

the condenser comprises at least one condensing plate which is arranged at intervals along the horizontal direction, and the at least one condensing plate is vertically fixed in the liquid collecting tank respectively.

4. The battery pack according to claim 2, wherein:

the condenser is arranged in an integrated mode, a flow guide structure is arranged on the condenser, and the flow guide structure extends to the flow guide structure.

5. The battery pack according to claim 4, wherein:

the flow guide structure is arranged on the condenser in a sawtooth shape or a wavy shape.

6. The battery pack according to claim 5, wherein:

the diversion structure that cockscomb structure or wavy setting are in the condenser both sides form a plurality of recesses, a plurality of recesses are in the both sides evenly distributed of condenser just extend to the collecting tank.

7. The battery pack according to any one of claims 1 to 6, wherein:

a humidity sensor is arranged in the battery pack box body;

8. The battery pack according to claim 7, wherein:

the battery pack box body is provided with an explosion-proof vent valve, and the explosion-proof vent valve comprises an outer vent end positioned on the outer side of the battery pack box body and an inner vent end positioned on the inner side of the battery pack box body;

the humidity sensor and/or the condenser are/is arranged in the area, close to the inner ventilation end of the explosion-proof ventilation valve, in the battery pack box body.

9. The battery pack according to claim 8, wherein:

the condenser is arranged in an area horizontally opposite to the inner ventilating end of the explosion-proof ventilating valve, and the humidity sensor is arranged between the explosion-proof ventilating valve and the condenser.