CN220984623U - Battery pack and thermal management system - Google Patents

Abstract

The application provides a battery pack and a thermal management system, wherein the battery pack comprises a box body, a battery core module, a first pipeline, a liquid inlet pipe and a liquid return pipe, wherein a containing cavity is formed in the box body; the cell module comprises a plurality of cells which are arranged in a stacked manner, and is arranged in the accommodating cavity; the first pipeline is attached to the cell module; one end of the liquid inlet pipe extends to the space between adjacent electric cores or to the side of the electric cores; one end of the liquid return pipe extends to the position between adjacent electric cores or beside the electric cores; wherein, the first pipeline communicates with the other end of one of the feed liquor pipe and the return liquor pipe. This scheme is close to the mode that the electric core set up to the electric core cooling through coolant liquid submergence electric core and first pipeline combined together to promote the cooling effect to the electric core.

Description

Battery pack and thermal management system

Technical Field

The application relates to the technical field of batteries, in particular to a battery pack and a thermal management system.

Background

With the rapid development of battery technology, when the battery pack works, the battery core in the battery pack can generate heat, and some of the prior art can submerge the battery core through cooling liquid to cool the battery core, but the submergence cooling adjusts the overall temperature of all components in the battery pack, so that the position of the battery core can not be accurately cooled, and the cooling effect on the battery core is poor.

Disclosure of utility model

In view of the above, the application provides a battery pack, which solves the problems that the cooling liquid submerges the battery core to cool the battery core, the position of the battery core cannot be accurately cooled, and the cooling effect on the battery core is poor. The application also provides a thermal management system comprising the battery pack.

In order to achieve the above purpose, the present application provides the following technical solutions:

A battery pack, comprising:

A box body, wherein a containing cavity is formed in the box body;

The battery cell module comprises a plurality of battery cells which are arranged in a stacked manner, and the battery cell module is arranged in the accommodating cavity;

A first pipeline attached to the cell module;

one end of the liquid inlet pipe extends to the position between adjacent electric cores or beside the electric cores;

One end of the liquid return pipe extends to the position between adjacent electric cores or beside the electric cores;

Wherein, first pipeline with the feed liquor pipe with the other end intercommunication of one of the return liquid pipe. Optionally, the device further comprises a second pipeline, wherein the second pipeline is attached to the cell module, and the second pipeline is communicated with the other end of the other one of the liquid inlet pipe and the liquid return pipe.

Optionally, in the first direction, the first pipeline is disposed on one side of the accommodating cavity and covers part of the battery cell module, the second pipeline includes a first unit and a second unit disposed on the other side of the accommodating cavity and covers the rest of the battery cell module, and the first unit is disposed around the first pipeline.

Optionally, the first pipeline and/or the second pipeline are arranged in a net shape.

Optionally, the first pipeline and/or the second pipeline are/is arranged at the top of the explosion-proof valve of the electric core, and at least part of the first pipeline and/or the second pipeline which are aligned with the explosion-proof valve is a hot melting pipe.

Optionally, in the second direction,

The liquid inlet pipe is positioned in the middle of the battery cell module, and the liquid return pipes are at least two and are respectively positioned at the end parts of the two sides of the battery cell module; or alternatively, the first and second heat exchangers may be,

The liquid inlet pipes are at least two and are respectively positioned at the end parts of the two sides of the electric core module, and the liquid return pipe is positioned in the middle of the electric core module; or alternatively, the first and second heat exchangers may be,

The liquid inlet pipe is positioned at one side end part of the battery cell module, and the liquid return pipe is positioned at the other side end part of the battery cell module.

Optionally, the device further comprises a cross beam, the cross beam is located in the middle of the box body and divides the accommodating cavity into two mounting cavities, the mounting cavities are internally provided with the cell core modules respectively, the liquid inlet pipe is close to the cross beam, and the liquid return pipe is located at the end part of the box body away from the cross beam.

Optionally, in the third direction, the accommodating cavity is divided into a first area, a second area and a third area in sequence;

The area of the first pipeline and/or the second pipeline covering the battery cell module in the first area is M, the area of the first pipeline and/or the second pipeline covering the battery cell module in the second area is N, and the area of the first pipeline and/or the second pipeline covering the battery cell module in the third area is P, wherein M, N and P satisfy the following conditions: m > P, M > N.

Optionally, the section of the first pipeline and/or the section of the second pipeline are flat, the width of the pipeline is b, the height of the pipeline is h, b is more than or equal to 10mm and less than or equal to 150mm, and h is more than or equal to 2.5mm and less than or equal to 10mm.

Optionally, the first pipeline and/or the second pipeline are provided with resistance reducing parts, and the flow cross section of the resistance reducing parts is larger than the flow cross section of the rest parts of the first pipeline and/or the second pipeline.

Optionally, in the direction of the height of the electric core, the liquid outlet of the liquid inlet pipe and the liquid inlet of the liquid return pipe are both lower than the top edge of the electric core, wherein the length of the liquid inlet pipe extending into the accommodating cavity is smaller than half of the height of the electric core, and the length of the liquid return pipe extending into the accommodating cavity is greater than or equal to half of the height of the electric core and smaller than the height of the electric core.

Optionally, the device comprises a cover body, and the cover body is integrated with the first pipeline and/or the second pipeline.

Optionally, the feed liquor pipe with return the liquid pipe all is provided with a plurality ofly, and all follows the direction that the electric core is range upon range of evenly sets up, and adjacent the space between the electric core is formed with the runner that link up.

Optionally, the first pipeline includes a plurality of connecting portions that are connected with the feed liquor pipe, the cross-sectional area of flow of connecting portion is greater than the cross-sectional area of flow of other positions of first pipeline.

Optionally, the device comprises a total liquid inlet communicated with the first pipeline and a total liquid return port communicated with the second pipeline, wherein the total liquid inlet and the total liquid return port are positioned on the electricity connection side of the box body.

A thermal management system comprising a circulation pump, a radiator, an expansion tank, a throttle valve, and a battery pack according to any one of the above, wherein,

The circulating pump is connected with the first pipeline of the battery pack;

one end of the radiator is connected with a second pipeline of the battery pack, and the other end of the radiator is connected with the circulating pump;

One end of the expansion kettle is connected with the battery pack, and the other end of the expansion kettle is connected with the circulating pump; and/or one end of the expansion kettle is connected with the radiator, and the other end of the expansion kettle is connected with the circulating pump;

The throttle valve is arranged between the expansion pot and the radiator and/or between the expansion pot and the battery pack.

According to the battery pack provided by the application, the first pipeline is attached to the battery core module, and the first pipeline is connected with one of the liquid inlet pipe and the liquid return pipe, so that when the cooling liquid flows in the first pipeline, the first pipeline can primarily cool the battery core in the battery core module, the liquid inlet pipe injects the cooling liquid into the accommodating cavity provided with the battery core, the cooling liquid can cool the battery core through contact, and then the liquid return pipe discharges the cooling liquid. This scheme is close to the mode that the electric core set up to the electric core cooling through coolant liquid submergence electric core and first pipeline combined together to promote the cooling effect to the electric core.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.

Fig. 1 is an exploded view of a battery pack provided in the present embodiment;

FIG. 2 is a front view of an exploded view;

FIG. 3 is a three-dimensional view of the hidden case and cover;

FIG. 4 is a top view of the hidden case and cover;

FIG. 5 is a front view of the hidden case and cover;

FIG. 6 is a bottom view of the hidden case bottom plate;

FIG. 7 is a schematic diagram of a thermal management system.

In fig. 1-7:

1-a box body, 2-a battery cell module, 3-a first pipeline, 4-a liquid inlet pipe, 5-a liquid return pipe, 6-a second pipeline, 7-a cross beam, 8-a cover body, 9-a total liquid inlet, 10-a total liquid return port, 11-a circulating pump, 12-a radiator, 13-an expansion kettle, 14-a throttle valve and 15-a battery pack;

201-battery cell, 301-connecting part, 601-resistance reducing part;

2011-explosion-proof valve.

Detailed Description

The application provides a battery pack. The application also provides a thermal management system comprising the battery pack.

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

As shown in fig. 1 to 7, the embodiment of the present application provides a battery pack 15, and the battery pack 15 is an integral unit assembled from a plurality of battery modules for storing and supplying electric power. The battery cell module comprises a box body 1, a battery cell module 2, a first pipeline 3, a liquid inlet pipe 4 and a liquid return pipe 5, wherein a containing cavity is formed in the box body 1, the battery cell module 2 comprises a plurality of battery cells 201 which are arranged in a stacked mode, the battery cell module 2 is arranged in the containing cavity and is positioned in the box body 1, the battery cells 201 refer to the most basic component parts in a battery, and are usually electrochemical devices packaged in a metal shell, and the box body 1 provides an installation space for the battery cell module 2; the first pipeline 3 is attached to the battery core module 2, wherein the first pipeline 3 is a flowing pipeline of heat exchange medium, and the battery core 201 is cooled by heat conduction when the heat exchange medium in the first pipeline 3 flows due to the attachment of the first pipeline 3 to the battery core module 2; one end of the liquid inlet pipe 4 extends to between adjacent electric cores 201 or to the side of the electric cores 201, one end of the liquid return pipe 5 extends to between adjacent electric cores 201 or to the side of the electric cores 201, the liquid inlet pipe 4 is used for injecting heat exchange medium into the box body 1 provided with the electric core module 2, and the liquid return pipe 5 is used for guiding out the heat exchange medium in the box body 1, so that the circulation flow of the heat exchange medium in the box body 1 is realized, and the cooling of the electric cores 201 is realized.

The first pipeline 3 is communicated with the other end of one of the liquid inlet pipe 4 and the liquid return pipe 5, and illustratively, when the first pipeline 3 is communicated with the liquid inlet pipe 4, a heat exchange medium firstly enters the first pipeline 3, and in the process of flowing the heat exchange medium through the first pipeline 3, as the first pipeline 3 is attached to the electric core 201, the heat exchange medium flowing through the first pipeline 3 carries out primary cooling on the electric core 201, then flows into the box body 1 provided with the electric core 201 from the liquid inlet pipe 4, the heat exchange medium contacts with the electric core 201 in the box body 1 to cool the electric core 201 again, and then the liquid return pipe 5 guides out the heat exchange medium, so that one flowing cycle of the heat exchange medium in the mode is completed; when the first pipeline 3 is communicated with the liquid return pipe 5, the heat exchange medium firstly enters the box body 1 provided with the electric core 201 through the liquid inlet pipe 4, the heat exchange medium contacts with the electric core 201 to primarily cool the electric core 201 in the box body 1, then enters the first pipeline 3 from the liquid return pipe 5, although the temperature of the heat exchange medium is not greatly increased although the electric core 201 is primarily cooled, or the condition that the temperature of the heat exchange medium is lower than that of the electric core 201 is possible exists, then the heat exchange medium in the box body 1 flows to the first pipeline 3 through the liquid return pipe 5, and the heat exchange medium flows in the first pipeline 3 to cool the electric core 201 again due to the fact that the first pipeline 3 is attached to the electric core 201, so that one flow cycle of the heat exchange medium is completed in the mode.

Here, the heat exchange medium flowing through the first pipe 3 is not limited, and the heat exchange medium may be a cooling liquid, a cooling gas (gas having a temperature lower than that of the cell 201), or a mixture of the cooling liquid and the cooling gas, as long as the cooling of the cell 201 can be achieved. Correspondingly, the heat exchange medium flowing in the liquid inlet pipe 4 and the liquid return pipe 5 is the same as the heat exchange medium flowing in the first pipeline 3, and can be either cooling liquid or cooling gas or a mixture of the cooling liquid and the cooling gas.

It should be noted that, the first pipeline 3 is attached to the cell module 2, which not only includes that there is no other structure in the middle of the two being attached tightly, but also includes that the first pipeline 3 is used for cooling the cell 201 in the cell module 2 by heat conduction, and the first pipeline 3 is used for bonding with the cell module 2 by heat conduction glue, or other heat conduction components are arranged between the first pipeline 3 and the cell module 2, and the attachment of the first pipeline 3 and the cell module 2 means that heat conduction can occur between the cell module 2 and the first pipeline 3, and the first pipeline 3 can be used for cooling the cell module 2.

It should be noted that, one end of the liquid inlet pipe 4 extends to between adjacent electric cores 201 or beside the electric cores 201, so that the heat exchange medium cools the electric cores 201 at the first time, and the cooling effect of the heat exchange medium on the electric cores 201 is improved; one end of the liquid return pipe 5 extends to the space between the adjacent cells 201 or to the side of the cells 201. Preferably, the liquid inlet pipe 4 and the liquid return pipe 5 are arranged between 21 of different electric cores 201 or beside different electric cores 201 in the box body 1, and the liquid return pipe 5 is used for guiding the heat exchange medium cooled by the electric cores 201 out of the box body 1.

It should be further noted that one end of the liquid inlet pipe 4 refers to a liquid outlet end of the heat exchange medium, the other end of the liquid inlet pipe 4 refers to a liquid inlet end of the heat exchange medium, one end of the liquid return pipe 5 refers to the liquid inlet pipe 4 of the heat exchange medium, and the other end of the liquid return pipe 5 refers to the liquid outlet end of the heat exchange medium.

The battery pack 15 of above-mentioned structure, through laminating first pipeline 3 with electric core module 2, first pipeline 3 and feed liquor pipe 4 and the connection of one of return liquid pipe 5, when heat transfer medium flows in first pipeline 3 like this, first pipeline 3 can carry out preliminary cooling to electric core 201 in the electric core module 2, and feed liquor pipe 4 pours into heat transfer medium into the box 1 that is provided with electric core 201 into moreover, heat transfer medium can cool down the cooling through contact type electric core 201, then is discharged heat transfer medium by return liquid pipe 5 again. According to the scheme, the heat exchange medium submerges the battery cell 201 and the first pipeline 3 are close to the battery cell 201, and the battery cell 201 is cooled in a combined mode, so that the cooling effect on the battery cell 201 is improved.

In the following examples, a heat exchange medium is taken as a cooling liquid.

Further, in some embodiments, the battery pack 15 further includes a second pipe 6, where the second pipe 6 is attached to the cell module 2, and the second pipe 6 is in communication with the other end of the other of the liquid inlet pipe 4 and the liquid return pipe 5. Specifically, the second pipe 6 is communicated with the other end of one of the liquid inlet pipe 4 and the liquid return pipe 5 on the basis that the first pipe 3 is communicated with the other end of the other of the liquid inlet pipe 4 and the liquid return pipe 5. The first pipeline 3 may be a liquid inlet pipeline 4, and the second pipeline 6 is a liquid return pipeline 5; the first pipeline 3 may be a liquid return pipeline 5, and the second pipeline 6 is a liquid inlet pipeline 4. The first pipe 3 and the second pipe 6 are arranged in three ways, namely, only the liquid inlet pipe 4 or the liquid return pipe 5 is arranged in the battery pack 15, and the two ways have been described in the above embodiment, and the liquid inlet pipe 4 and the liquid return pipe 5 can also be arranged in the battery pack 15.

The first pipe 3 is an inlet pipe 4 and the second pipe 6 is connected to the liquid return pipe 5, so that the first pipe 3 and the second pipe 6 can be attached to the core cell set 2, at this time, when the first pipe 3 is connected to the inlet pipe 4 and the second pipe 6 is connected to the liquid return pipe 5, the cooling liquid first enters the first pipe 3, in the flowing process of the cooling liquid in the first pipe 3, as the first pipe 3 is attached to the core cell 201, the cooling liquid flowing in the first pipe 3 cools the core cell 201 for the first time, then the cooling liquid flows into the box 1 provided with the core cell 201 from the inlet pipe 4, the cooling liquid cools the core cell 201 in the box 1 again, then the cooling liquid is led to the second pipe 6 from the liquid return pipe 5, the cooling liquid flows into the second pipe 6 to cool the core cell 201 again, and thus a flowing cycle of the cooling liquid is completed.

So set up, the coolant liquid flows through first pipeline 3, feed liquor pipe 4, electric core 201, returns liquid pipe 5, second pipeline 6 in proper order, increases the circulation route of coolant liquid, increases the contact number of times of coolant liquid and electric core 201, increases the cooling number of times to electric core 201, further promotes the cooling effect to electric core 201.

It should be noted that, the liquid inlet pipe 4 and the liquid return pipe 5 may have a tubular structure, or may have liquid inlet holes or liquid return holes formed in the first pipeline 3 and the second pipeline 6.

It should be noted that the arrangement of the first pipe 3 and the second pipe 6 is not exclusive, and may be exemplified by the following arrangement, for example: the first pipeline 3 and the second pipeline 6 are both arranged on the top of the battery cell module 2 (refer to fig. 1-6); the first pipeline 3 is arranged at the top of the cell module 2, and the second pipeline 6 is arranged at the bottom of the cell module 2; the first pipeline 3 is arranged at the bottom of the cell module 2, and the second pipeline 6 is arranged at the top of the cell module 2; the first pipeline 3 and the second pipeline 6 are both arranged at the bottom of the battery cell module 2.

In some embodiments, in the first direction, the first pipeline 3 is disposed on one side of the accommodating cavity and covers a part of the cell module 2, the second pipeline 6 comprises a first unit and a second unit disposed on the other side of the accommodating cavity and covers the rest of the cell module 2, and the first unit is disposed around the first pipeline 3. Specifically, taking the liquid inlet pipe 4 with the first pipe 3 as the cooling liquid and the second pipe 6 with the liquid return pipe 5 as the cooling liquid as an example, it is sure that the first pipe 3 covers the larger area of the battery core module 2, the cooling effect of the battery core module 2 is better, but considering the volume of the accommodating cavity in the battery pack 15 and the setting position of the second pipe 6, if the first pipe 3 covers all the battery core modules 2 in the accommodating cavity, the second pipe 6 cannot be reasonably arranged, or the second pipe 6 needs to be provided with a plurality of battery packs 15 which are inconvenient to integrally plan and set, and the first pipe 3 and/or the second pipe 6 dominate the cooling of the battery core 201 and the cooling liquid contact battery core 201 through heat conduction, the first pipe 3 is arranged on one side of the accommodating cavity and covers part of the battery core module 2, the second pipe 6 comprises a first unit and a second unit arranged on the other side of the accommodating cavity and covers the rest of the battery core module 2, and the first unit is arranged around the first pipe 3. So set up, can promote the rationality of first pipeline 3 and the overall arrangement of second pipeline 6 in the battery package 15, and do benefit to the total inlet 9 with the first pipeline 3 intercommunication and the total arrangement of returning liquid mouth 10 with the second pipeline 6 intercommunication, make the overall arrangement of battery package 15 compacter, promote the energy density of battery package 15.

The first direction may be in the direction indicated by the double-headed arrow a in fig. 1, or in the direction indicated by the double-headed arrow B in fig. 1, or in a direction between the a direction and the B direction.

In some embodiments, the first conduit 3 and/or the second conduit 6 are provided in a mesh. Specifically, in the battery pack 15 in general, a plurality of battery core modules 2 are arranged side by side or in an array in the battery pack 15, and the battery core modules 2 are formed by stacking a plurality of battery cores 201, wherein the first pipeline 3 and/or the second pipeline 6 are arranged into a net structure, and the arrangement mode of the pipelines in the first pipeline 3 and the second pipeline 6 is preferably the same as the arrangement direction of the battery cores 201, so that when the cooling liquid flows in the first pipeline 3 and the second pipeline 6, the contact area between the first pipeline 3 and the second pipeline 6 and the battery cores 201 can be increased, and the cooling effect on the battery cores 201 is improved.

Specifically, the first pipeline 3 and/or the second pipeline 6 are arranged in a net shape, which means that the pipelines are arranged in an array of rectangular, m-shaped, triangular, polygonal, fan-shaped and the like, or the first pipeline 3 and/or the second pipeline 6 respectively comprise a plurality of mutually communicated sub-pipelines, and the plurality of sub-pipelines are arranged in a net shape.

In some embodiments, the first pipeline 3 and/or the second pipeline 6 are disposed on top of the explosion-proof valve 2011 of the battery cell 201, and the first pipeline 3 and/or the second pipeline 6 disposed at least partially aligned with the explosion-proof valve 2011 are hot melt pipes. Specifically, the multiple battery cells 201 are stacked to form the battery cell group 2, part of the pipelines in the first pipeline 3 and/or the second pipeline 6 are arranged at the top of the explosion-proof valve 2011 of the battery cell 201, the first pipeline 3 and/or the second pipeline 6 which are aligned with the explosion-proof valve 2011 are hot melt pipes, the hot melt pipes refer to pipes which are heated and melt, when a thermal runaway fault occurs in the battery, high-temperature high-pressure gas-liquid mixture in the battery can rush out of the explosion-proof valve 2011, and because the hot melt pipes are aligned with the explosion-proof valve 2011, the high-temperature high-pressure gas can melt the hot melt pipes, and therefore cooling liquid in the first pipeline 3 and/or the second pipeline 6 flows out to quickly cool the battery cell 201 which is in thermal runaway, so that the battery cell 201 which is in fault is quickly cooled is realized, the safety of the battery pack 15 is improved, and the battery cell 201 which is in thermal runaway can be prevented from affecting normal operation of other battery cells 201, so that normal use of the battery pack 15 is ensured.

It should be noted that, at least part of the first pipeline 3 and/or the second pipeline 6 configured to align the explosion-proof valve 2011 is a hot-melt pipe, where the aligning includes not only aligning the hot-melt pipe with the explosion-proof valve 2011 in the direction indicated by the double-headed arrow a in fig. 1, but also the situation that the two are overlapped in the aligning direction, or when the battery cell 201 is sprayed from the explosion-proof valve 2011 with high-temperature and high-pressure gas in thermal runaway, it is only required to ensure that the hot-melt pipe can melt for the first time and accurately cool the battery cell 201 in thermal runaway.

In addition, the first pipeline 3 and/or the second pipeline 6 may be a bottom of the explosion-proof valve 2011 disposed on the battery cell 201.

In some embodiments, in the second direction, the liquid inlet pipe 4 is located in the middle of the cell module 2, and the liquid return pipes 5 are at least two and are respectively located at two side ends of the cell module 2; or, at least two liquid inlet pipes 4 are arranged and are respectively positioned at the two side end parts of the battery cell module 2, and a liquid return pipe 5 is positioned at the middle part of the battery cell module 2; or, the liquid inlet pipe 4 is positioned at one side end of the battery cell module 2, and the liquid return pipe 5 is positioned at the other side end of the battery cell module 2.

Specifically, when the liquid inlet pipe 4 is located in the middle of the battery cell module 2 and the liquid return pipe 5 is located at two side ends of the battery cell module 2, cooling liquid enters the middle of the battery cell module 2 from the liquid inlet pipe 4, and the cooling liquid flows from the middle of the battery cell module 2 to the two side ends, so that the battery cells 201 in all battery cell modules 2 of the box body 1 can be cooled; when the liquid inlet pipe 4 is positioned at the two side ends of the battery cell module 2, the liquid return pipe 5 is positioned in the middle of the battery cell module 2, at the moment, cooling liquid enters the end parts of the battery cell module 2 from the liquid inlet pipe 4, and the cooling liquid flows to the middle of the battery cell module 2 from the two side end parts of the battery cell module 2, so that the battery cells 201 in all battery cell modules 2 of the box body 1 can be cooled; when the liquid inlet pipe 4 is located at one side end of the cell module 2, the liquid return pipe 5 is located at the other side end of the cell module 2, and at this time, the cooling liquid enters into one side end of the cell module 2 from the liquid inlet pipe 4, and the cooling liquid flows from one side end to the other side end of the cell module 2, so that the cooling can be performed on the cells 201 in all the cell modules 2 of the box 1. Through the arrangement of the cooling liquid, all the battery cells 201 in the box body 1 can be cooled, and the cooling effect of the battery cells 201 on the cooling liquid is improved.

It should be noted that, the middle part of the cell module 2 refers to the middle part of all the cell modules 2 in the case 1, and the corresponding two side ends of the cell module 2 refer to the two side ends of all the cell modules 2 in the case 1.

It should be noted that the second direction may be the same as the first direction or may be different from the first direction, and the second direction may be the direction indicated by the double-headed arrow a in fig. 1, the direction indicated by the double-headed arrow B, or the direction between the double-headed arrow a and the double-headed arrow B.

In some embodiments, the battery pack 15 further includes a cross beam 7, the cross beam 7 is located in the middle of the box body 1 and divides the accommodating cavity into two mounting cavities, the cell module 2 is respectively mounted in each mounting cavity, the liquid inlet pipe 4 is disposed close to the cross beam 7, and the liquid return pipe 5 is located at the end of the box body 1 far away from the cross beam 7. Specifically, in the direction indicated by the double arrow a in fig. 1, that is, in the length direction of the case 1, since the span of the accommodating chamber is large, a cross beam 7 is provided in the middle area of the accommodating chamber, and the cross beam 7 is provided for improving the stability of the overall structure of the case 1. The middle area of the accommodating cavity is the same as the middle position of all the battery cell modules 2, the liquid inlet pipe 4 is arranged close to the cross beam 7, the cross beam 7 divides the accommodating cavity into two accommodating cavities, the liquid inlet pipe 4 is provided with two groups, the liquid inlet pipe 4 can cool the battery cell modules 2 in the two accommodating cavities respectively, in the direction shown by the double-headed arrow A in the figure 1, the liquid inlet pipe 4 is arranged in the middle of all the battery cell modules 2, the middle temperature of the box body 1 is highest because the heat dissipation effect of the middle battery cell 201 is worst, the liquid inlet pipe 4 is arranged close to the cross beam 7, the cooling liquid can cool the battery cell 201 in the middle of the box body 1 at the first time, thereby further improving the cooling effect of the battery cell 201, and fixing the liquid inlet pipe 4 on the cross beam 7 is also convenient for setting the liquid inlet pipe 4 close to the cross beam 7, and improving the stability of the structure of the liquid inlet pipe 4.

It should be noted that, since most of the space in the case 1 is occupied by the cell module 2, the middle portion of the case 1 and the middle portion of the cell module 2 are regarded as approximately the same position.

Further, in the third direction, the accommodating cavity is divided into a first area, a second area and a third area in sequence; the area of the first pipeline 3 and/or the second pipeline 6 covering the battery cell module 2 in the first area is M, the area of the first pipeline 3 and/or the second pipeline 6 covering the battery cell module 2 in the second area is N, the area of the first pipeline 3 and/or the second pipeline 6 covering the battery cell module 2 in the third area is P, wherein M, N and P satisfy the following conditions: m > P, M > N. In the above embodiment, the coverage area of the first pipeline 3 and/or the second pipeline 6 to the battery core module 2 in the middle of the accommodating cavity is guaranteed to be the largest, and on the basis that the liquid inlet pipe 4 is arranged in the middle of the box 1, in order to further improve the cooling effect to the battery core 201 in the box 1, the coverage area of the first pipeline 3 and/or the second pipeline 6 to the battery core 201 in the middle of the box 1 is larger than the coverage area of the first pipeline 3 and/or the second pipeline 6 to the battery core 201 in the end of the box 1, that is, more first pipelines 3 and/or second pipelines 6 are arranged in the middle of the box 1, so that the cooling effect to the battery core 201 is further improved through heat conduction between the first pipeline 3 and/or the second pipeline 6 and the battery core 201.

The third direction may be the same direction as the first direction and/or the second direction, or may be a direction different from the first direction and/or the second direction, and specifically, the third direction may be a direction indicated by a double-headed arrow a in fig. 1, a direction indicated by a double-headed arrow B in fig. 1, or a direction located between the a direction and the B direction.

It should be further noted that, the coverage area of the first pipeline 3 and/or the second pipeline 6 on the battery cell 201 in the middle of the box 1 is larger than the coverage area of the battery cell 201 in the end of the box 1, which includes that when the pipeline cross-sectional areas of the first pipeline 3 and/or the second pipeline 6 are equal, the first pipeline 3 and/or the second pipeline 6 are more densely arranged in the middle of the box 1, and when the pipeline cross-sectional areas of the first pipeline 3 and/or the second pipeline 6 are not equal, the cross-sectional area of the pipeline in the middle of the box 1 in the first pipeline 3 and/or the second pipeline 6 is larger than the cross-sectional area in the rest positions of the box 1.

In some embodiments, the first pipeline 3 and/or the second pipeline 6 has a flat pipeline section, the width of the pipeline is b, the height of the pipeline is h, and 11 mm.ltoreq.b.ltoreq.150 mm, and 2.5 mm.ltoreq.h < 11mm. Specifically, the pipe section of the first pipe 3 and/or the second pipe 6 is flat, so that the bonding area between the first pipe 3 and/or the second pipe 6 and the battery cell 201 can be increased, the cooling efficiency of the battery cell 201 is further ensured, and the size of the battery pack 15 in the direction of the double-headed arrow C in fig. 1 can be reduced, the setting size of the non-discharge unit is reduced, and the energy density of the battery is increased.

It should be noted that, when the pipes of the first pipe 3 and/or the second pipe 6 are arranged in the direction indicated by the double-headed arrow a in fig. 1, the width of the pipe refers to the dimension of the pipe in the direction indicated by the double-headed arrow B in fig. 1; when the lines of the first line 3 and/or the second line 6 are arranged in the direction indicated by the double arrow B in fig. 1, the width of the line refers to the dimension of the line in the direction of the double arrow a in fig. 1; and the height of the pipe refers to the dimension of the pipe in the direction of the double arrow C in fig. 1.

Preferably, b is 11mm or less and 30mm or less, h is 2.5mm or less and 4mm or less, and the width and the height of the first pipeline 3 and/or the second pipeline 6 are set within the range, so that the arrangement of the flow channels is more dense on the premise of ensuring the flow speed of the flow channels.

Specifically, the width of the pipes in the first pipe 3 and/or the second pipe 6 may be 11mm, 15mm, 20mm, 25mm, 30mm, 50mm, 90mm, 110mm, 130mm, 150mm, and the height of the pipes in the first pipe 3 and/or the second pipe 6 may be 2.5mm, 2.9mm, 3mm, 3.2mm, 3.5mm, 3.9mm, 4mm, 6mm, 9mm, 11mm.

In some embodiments, the first pipeline 3 and/or the second pipeline 6 are provided with a resistance reducing portion 601, and the flow cross-sectional area of the resistance reducing portion 601 is larger than the flow cross-sectional area of the rest of the first pipeline 3 and/or the second pipeline 6. Specifically, the resistance reducing portion 601 may be disposed in the first pipeline 3, may be disposed in the second pipeline 6, or may be disposed in both the first pipeline 3 and the second pipeline 6. When the flow sectional areas of the positions of the first pipeline 3 and/or the second pipeline 6 are the same, the flow resistance of the cooling liquid in the first pipeline 3 and/or the second pipeline 6 is uniform, and the sectional area of the resistance reducing part 601 is larger than the flow sectional area of the rest of the first pipeline 3 and/or the second pipeline 6, so that the resistance reducing part 601 can relieve the flow resistance of the cooling liquid in the rest of the first pipeline 3 and/or the second pipeline 6, thereby improving the flow speed of the cooling liquid in the first pipeline 3 and/or the second pipeline 6, and further improving the cooling effect of the cooling liquid on the battery cell 201.

The cross-sectional flow area refers to the cross-sectional area of a conduit or channel through which fluid flows.

Further, taking the setting of the resistance-reducing portion 601 in the second pipeline 6 as an example, wherein the resistance-reducing portion 601 is provided with a plurality of grooves for avoiding the first pipeline 3, and the setting of the grooves for avoiding the first pipeline 3 and the second pipeline 6 can promote the rationality of the layout of the first pipeline 3 and the second pipeline 6, and in the area of the limited accommodating cavity, the coverage area of the first pipeline 3 and/or the second pipeline 6 to the cell module 2 is promoted, so as to promote the cooling effect to the cell 201.

In some embodiments, in the direction of the height of the battery cell 201, the liquid outlet of the liquid inlet pipe 4 and the liquid inlet of the liquid return pipe 5 are lower than the top edge of the battery cell 201, wherein the length of the liquid inlet pipe 4 extending into the accommodating cavity is smaller than half of the height of the battery cell 201, and the length of the liquid return pipe 5 extending into the accommodating cavity is greater than or equal to half of the height of the battery cell 201 and smaller than the height of the battery cell 201. Specifically, one end of the liquid inlet pipe 4 extends between adjacent cells 201 or beside the cells 201, the other end of the liquid inlet pipe 4 is connected with the first pipeline 3, one end of the liquid return pipe 5 extends between adjacent cells 201 or beside the cells 201, and the other end of the liquid return pipe 5 is connected with the second pipeline 6; one end of the liquid inlet pipe 4 preferably extends between the adjacent electric cores 201, and the liquid return pipe 5 extends to the side of the electric cores 201 (see fig. 3-5), so that liquid entering from the liquid inlet pipe 4 can quickly flow to each electric core 201, and accurate cooling of the electric cores 201 is achieved. Further, the liquid outlet of the liquid inlet pipe 4 and the liquid inlet of the liquid return pipe 5 are guaranteed to be lower than the top edge of the electric core 201, the size of the liquid inlet pipe 4 is smaller than half of the height of the electric core 201, the height of the electric core 201 is taken as an example, the liquid outlet of the liquid inlet pipe 4 is located at the position from 0 to 0.5H of the electric core 201, the size of the liquid return pipe 5 is greater than or equal to half of the height of the electric core 201 and smaller than the height of the electric core 201, the liquid inlet of the liquid return pipe 5 is located at the position from 0.5H of the electric core 201, and the liquid outlet of the liquid inlet pipe 4 is lower than the liquid inlet of the liquid return pipe 5, so that more positions of the electric core 201 are cooled by cooling liquid, and the cooling effect of the cooling liquid on the electric core 201 is improved.

Note that, the height direction of the cell 201 refers to the direction indicated by the double-headed arrow C in fig. 1.

In addition, the liquid outlet of the liquid inlet pipe 4 can be higher than the top edge of the electric core 201 or is flush with the top edge of the electric core 201; the liquid inlet pipe 4 can be a liquid inlet formed on the first pipeline 3, the liquid return pipe 5 can also be a liquid return hole formed on the second pipeline 6, at this time, the first pipeline 3 is located at the top of the cell module 2, and the second pipeline 6 is located at the bottom of the cell module 2.

In some embodiments, the battery pack 15 includes a cover 8, the cover 8 being integral with the first conduit 3 and/or the second conduit 6. Specifically, the cover body 8 is used for sealing the box body 1 provided with the battery cell module 2, and the first pipeline 3 and/or the second pipeline 6 and the cover body 8 are integrated into a whole, so that the size of the battery pack 15 in the height direction of the battery pack 15 can be reduced, and the overall energy density of the battery pack 15 is improved; moreover, the cover body 8 and the first pipeline 3 and/or the second pipeline 6 are integrated into a whole, so that the number of components of the battery pack 15 is reduced, and the installation efficiency of the battery pack 15 is further improved.

Furthermore, the first line 3 and the second line 6 may also be arranged in other ways, for example: the bottom plate of the box body 1 is integrated with the first pipeline 3 and/or the second pipeline 6; one of the first pipe 3 and the second pipe 6 is integrated with the cover 8, and the other of the first pipe 3 and the second pipe 6 is integrated with the bottom plate of the tank 1.

Further, in some embodiments, the liquid inlet pipe 4 and the liquid return pipe 5 are all provided with a plurality of liquid inlets, and are all uniformly arranged along the stacking direction of the electric cores 201, and the gaps between the adjacent electric cores 201 are formed with through flow channels. Specifically, the liquid inlet pipe 4 and the liquid return pipe 5 are provided with a plurality of liquid return pipes, so that the speed of cooling liquid flowing from the first pipeline 3 to the box body 1 can be increased, the speed of cooling liquid flowing back to the box body 1 after the temperature of the battery cell 201 in the box body 1 can be increased, and the circulation speed of the cooling liquid can be increased; on this basis, further, evenly set up feed liquor pipe 4 and return liquid pipe 5 in the direction that electric core 201 is range upon range of, so set up when making the coolant liquid get into box 1, it is more even to distribute in electric core 201 to even cooling down to electric core 201, further promote the cooling efficiency to electric core 201, moreover the coolant liquid along evenly arranged feed liquor pipe 4 flow direction is located electric core 201 of box 1 different positions, can cool down to electric core 201 that makes the coolant liquid to different positions, in order to promote the cooling effect to electric core 201. And the gap between adjacent electric cores 201 forms the runner that the coolant liquid flows, and the coolant liquid flows in box 1, and the coolant liquid can be accurate to electric core 201 cooling at the in-process that flows, promotes the efficiency to electric core 201 cooling. And as for the liquid return pipe 5, the liquid return pipes 5 are also uniformly arranged along the stacking direction of the electric cores 201, so that the liquid return pipe 5 can quickly recover the cooling liquid flowing between the electric cores 201, thereby improving the circulation efficiency of the cooling liquid.

The stacking direction of the cells 201 is the direction indicated by the double-headed arrow B in fig. 1.

Of course, the liquid inlet pipe 4 and the liquid return pipe 5 can be only one, or the liquid inlet pipe 4 is provided with a plurality of liquid return pipes 5, or the liquid return pipe 5 is provided with a plurality of liquid inlet pipes 4, so that the temperature of the battery cell 201 can be reduced.

Further, the plurality of liquid inlet pipes 4 are uniformly arranged along the stacking direction of the electric core 201, two groups of liquid inlet pipes 4 are arranged in the middle of the direction shown by the double-headed arrow A in the direction of the double-headed arrow A in fig. 1, and thus the two groups of liquid inlet pipes 4 are used for cooling the electric core modules 2 on the two sides of the liquid inlet pipes 4 respectively, and the cooling efficiency of the cooling liquid on the electric core 201 is further improved.

Furthermore, the plurality of intake pipes 4 and the plurality of return pipes 5 may be arranged in other directions, for example: in the direction between the double-headed arrow B and the double-headed arrow a, or in a direction perpendicular to the stacked arrangement of the cells 201.

In some embodiments, the first pipeline 3 comprises a connecting part 301 connected with the liquid inlet pipes 4, and the flow cross-sectional area of the connecting part 301 is larger than the flow cross-sectional area of the rest parts of the first pipeline 3. Specifically, the connection portion 301 is connected to the plurality of liquid inlet tubes 4, and the preferred connection portion 301 is disposed in the middle of all the battery cell modules 2 along the direction indicated by the double-headed arrow a in fig. 1, so that the cooling liquid flowing out of the liquid inlet tubes 4 is convenient to cool the battery cells 201. The flow cross section of the connecting part 301 is larger than the flow cross section of the rest parts of the first pipeline 3, so that the connecting part 301 gathers the flow of a plurality of pipelines, thereby ensuring the continuity of the liquid supply of the liquid inlet pipe 4 into the box body 1 provided with the battery cell 201; the cross-sectional area of the connection portion 301 is large, so that the flow resistance of the coolant flowing through the first pipe 3 can be reduced, and the flow rate of the coolant can be increased.

In addition, the second pipeline 6 may also include a backflow portion (not shown in the figure) connected to the plurality of liquid return pipes 5, where the flow cross-sectional area of the backflow portion is greater than the flow cross-sectional area of the rest of the second pipeline 6, and the backflow portion has a similar function to the connection portion 301, and will not be described herein.

In some embodiments, a total liquid inlet 9 communicated with the first pipeline 3 and a total liquid return 10 communicated with the second pipeline 6 are included, and the total liquid inlet 9 and the total liquid return 10 are located on the power connection side of the box body 1. Specifically, taking the first pipeline 3 as the liquid inlet 4 pipeline of the cooling liquid, the second pipeline 6 as the liquid return 5 pipeline of the cooling liquid as an example, on this basis, the total liquid inlet 9 communicated with the first pipeline 3 and the total liquid return 10 communicated with the second pipeline 6 are arranged, so that the circulation flow of the cooling liquid can be realized, on this basis, the total liquid inlet 9 and the total liquid return 10 are positioned at the electricity connection side of the box body 1, and because the electricity connection side of the battery pack 15 is provided with components such as cable interfaces and components, the total liquid inlet 9, the total liquid return 10 and other electricity connection components are integrated together, so that the overall layout is more reasonable, the positions of the total liquid inlet 9 and the total liquid return 10 are not reserved at other positions, the layout of the battery pack 15 is more simplified, and the energy density of the battery pack 15 is improved.

A thermal management system comprising a circulation pump 11, a radiator 12, an expansion kettle 13, a throttle valve 14 and any battery pack 15 as described above, wherein the circulation pump 11 is connected with a first pipeline 3 of the battery pack 15; one end of the radiator 12 is connected with the second pipeline 6 of the battery pack 15, and the other end is connected with the circulating pump 11; one end of the expansion pot 13 is connected with the battery pack 15, and the other end is connected with the circulating pump 11; and/or one end of the expansion pot 13 is connected with the radiator 12, and the other end is connected with the circulating pump 11; the throttle valve 14 is provided between the expansion pot 13 and the radiator 12 and/or between the expansion pot 13 and the battery pack 15.

Specifically, the circulating pump 11 is connected with the first pipeline 3 of the battery pack 15, more specifically, the circulating pump 11 is connected with the total liquid inlet 9 through a connecting pipe, applies pressure to the cooling liquid for flowing the cooling liquid to the first pipeline 3, and then is conveyed into the box body 1 provided with the electric core 201 through the liquid inlet pipe 4; the radiator 12 is respectively connected with the circulating pump 11 and the second pipeline 6, the radiator 12 acts on the cooling liquid flowing out of the second pipeline 6 to cool the cooling liquid, and then the cooling liquid is pressurized by the circulating pump 11 and flows to the first pipeline 3 to form circulation of the cooling liquid so as to cool the electric core 201 in the battery pack 15. Further, an expansion pot 13 is provided between the battery pack 15 and the circulation pump 11, and/or an expansion pot 13 is provided between the radiator 12 and the expansion pot 13, and the expansion pot 13 discharges the gas in the cooling system so as to flow the cooling liquid into the tank 1. Further, a throttle valve 14 is provided between the expansion pot 13 and the radiator 12, and a throttle valve 14 is provided between the expansion pot 13 and the battery pack 15 to control the flow rate of the cooling liquid into the tank 1 and the flow rate of the cooling liquid out of the tank 1, thereby realizing the adjustment of the flow rate of the cooling liquid.

Further, since the thermal management system includes the above-described battery pack 15. The beneficial effects of the thermal management system caused by the battery pack 15 are referred to above and will not be described in detail herein.

The block diagrams of the devices, apparatuses, devices, systems referred to in the present application are only illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

It is also noted that in the apparatus, devices and methods of the present application, the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present application.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

It should be understood that the terms "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are used for more clearly describing the technical solutions, and are not intended to limit the scope of the present application.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims (16)

1. A battery pack, comprising:

A box body, wherein a containing cavity is formed in the box body;

The battery cell module comprises a plurality of battery cells which are arranged in a stacked manner, and the battery cell module is arranged in the accommodating cavity;

A first pipeline attached to the cell module;

one end of the liquid inlet pipe extends to the position between adjacent electric cores or beside the electric cores;

One end of the liquid return pipe extends to the position between adjacent electric cores or beside the electric cores;

Wherein, first pipeline with the feed liquor pipe with the other end intercommunication of one of the return liquid pipe.

2. The battery pack of claim 1, further comprising a second conduit attached to the cell module, the second conduit in communication with the other end of the other of the inlet tube and the return tube.

3. The battery pack according to claim 2, wherein in a first direction, the first pipe is disposed at one side of the accommodation chamber and covers a part of the cell module, the second pipe includes a first unit and a second unit disposed at the other side of the accommodation chamber and covers the remaining part of the cell module, and the first unit is disposed around the first pipe.

4. The battery pack of claim 2, wherein the first and/or second conduits are provided in a mesh-like arrangement.

5. The battery pack of claim 2, wherein the first and/or second conduit is disposed on top of an explosion-proof valve of the electrical cell, and the first and/or second conduit disposed at least partially in alignment with the explosion-proof valve is a hot melt tube.

6. The battery pack of claim 2, wherein, in the second direction,

The liquid inlet pipe is positioned in the middle of the battery cell module, and the liquid return pipes are at least two and are respectively positioned at the end parts of the two sides of the battery cell module; or alternatively, the first and second heat exchangers may be,

The liquid inlet pipes are at least two and are respectively positioned at the end parts of the two sides of the electric core module, and the liquid return pipe is positioned in the middle of the electric core module; or alternatively, the first and second heat exchangers may be,

The liquid inlet pipe is positioned at one side end part of the battery cell module, and the liquid return pipe is positioned at the other side end part of the battery cell module.

7. The battery pack of claim 6, further comprising a cross beam positioned in the middle of the case and dividing the receiving chamber into two mounting chambers, wherein each mounting chamber is internally provided with the cell module, the liquid inlet pipe is positioned close to the cross beam, and the liquid return pipe is positioned at the end of the case away from the cross beam.

8. The battery pack according to claim 2, wherein the receiving chamber is divided into a first region, a second region, and a third region in this order in the third direction;

The area of the first pipeline and/or the second pipeline covering the battery cell module in the first area is M, the area of the first pipeline and/or the second pipeline covering the battery cell module in the second area is N, and the area of the first pipeline and/or the second pipeline covering the battery cell module in the third area is P, wherein M, N and P satisfy the following conditions: m > P, M > N.

9. The battery pack according to claim 2, wherein the first pipeline and/or the second pipeline has a flat pipeline section, the pipeline has a width b, the pipeline has a height h, and b is more than or equal to 10mm and less than or equal to 150mm, and h is more than or equal to 2.5mm and less than or equal to 10mm.

10. The battery pack according to claim 2, wherein the first pipe and/or the second pipe is provided with a resistance-reducing portion, and a flow cross-sectional area of the resistance-reducing portion is larger than that of the remaining portion of the first pipe and/or the second pipe.

11. The battery pack according to claim 2, wherein in the direction of the height of the battery cell, the liquid outlet of the liquid inlet pipe and the liquid inlet of the liquid return pipe are lower than the top edge of the battery cell, wherein the length of the liquid inlet pipe extending into the accommodating cavity is smaller than half of the height of the battery cell, and the length of the liquid return pipe extending into the accommodating cavity is larger than or equal to half of the height of the battery cell and smaller than the height of the battery cell.

12. The battery pack of claim 2, comprising a cover integrated with the first and/or second conduits.

13. The battery pack according to claim 2, wherein the liquid inlet pipe and the liquid return pipe are both provided in plurality, and are both uniformly arranged along the stacking direction of the electric cores, and a through runner is formed in a gap between adjacent electric cores.

14. The battery pack according to claim 1, wherein the first pipe includes a connection portion connected to the plurality of liquid inlet pipes, and a flow cross-sectional area of the connection portion is larger than a flow cross-sectional area of the remaining portion of the first pipe.

15. The battery pack of claim 2, comprising a total liquid inlet in communication with the first conduit and a total liquid return in communication with the second conduit, the total liquid inlet and the total liquid return being located on a powered side of the housing.

16. A thermal management system comprising a circulation pump, a radiator, an expansion tank, a throttle valve, and a battery pack according to any one of claims 1 to 15, wherein,

The circulating pump is connected with the first pipeline of the battery pack;

one end of the radiator is connected with a second pipeline of the battery pack, and the other end of the radiator is connected with the circulating pump;

One end of the expansion kettle is connected with the battery pack, and the other end of the expansion kettle is connected with the circulating pump; and/or one end of the expansion kettle is connected with the radiator, and the other end of the expansion kettle is connected with the circulating pump;

The throttle valve is arranged between the expansion pot and the radiator and/or between the expansion pot and the battery pack.