CN219832771U

CN219832771U - Battery pack

Info

Publication number: CN219832771U
Application number: CN202320304907.1U
Authority: CN
Inventors: 陈保国; 彭月猛; 郑浩然; 董兴宇
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2023-02-23
Filing date: 2023-02-23
Publication date: 2023-10-13
Anticipated expiration: 2033-02-23

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack, which comprises a shell and a plurality of modules, wherein a first liquid inlet and a first liquid outlet are formed in the shell, a liquid inlet pipe penetrates through the first liquid inlet, and a liquid outlet pipe penetrates through the first liquid outlet. The plurality of modules are all arranged in the shell, each module is internally provided with a containing cavity, and the containing cavity of each module is communicated with the liquid inlet pipe and the liquid outlet pipe so that the cooling medium flows in each containing cavity. The cooling medium directly flows into the module, the battery pack is not filled with the cooling medium, and the cooling of the module is realized, and meanwhile, the use amount of the cooling medium is greatly reduced, so that the weight of the battery pack is reduced. And as the battery pack is not filled with the cooling medium, the explosion-proof performance of the explosion-proof valve of the battery pack is not influenced, and the safety of the battery pack is ensured.

Description

Battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery pack.

Background

The immersed cooling scheme of the battery pack is to fill the battery pack with a cooling medium so as to form immersed cooling for the battery modules in the battery pack, and the modules are completely immersed in the electrically insulating cooling medium. The existing submerged cooling battery packs have the following problems: the cooling medium occupies a larger volume in the battery pack, so that the battery pack has high weight, high cost and low energy density; and because the battery pack is filled with the cooling medium, the opening pressure of the explosion-proof valve of the battery pack is difficult to control, and the sealing performance of the sealing position of the battery pack is high.

Therefore, there is a need for a battery pack to solve the above-described problems.

Disclosure of Invention

The utility model aims at: the battery pack can reduce the use amount of a cooling medium, reduce the weight of the battery pack and ensure the explosion-proof performance of an explosion-proof valve of the battery pack.

To achieve the purpose, the utility model adopts the following technical scheme:

provided is a battery pack including:

the liquid inlet pipe is arranged at the first liquid inlet in a penetrating way, and the liquid outlet pipe is arranged at the first liquid outlet in a penetrating way;

the plurality of modules are arranged in the shell, each module is internally provided with a containing cavity, and each containing cavity of each module is communicated with the liquid inlet pipe and the liquid outlet pipe so that cooling medium flows in each containing cavity.

As a preferred scheme of the battery pack, a thermal runaway spraying opening is formed in the top cover of each module, the thermal runaway spraying opening is a through hole, or a module explosion-proof valve is arranged at the thermal runaway spraying opening.

As a preferred scheme of the battery pack, a second liquid outlet is formed in each side wall of the shell of the module, the second liquid outlet is communicated with the liquid outlet pipe, and the second liquid outlet is close to the top cover.

As a preferred scheme of the battery pack, each module comprises a plurality of electric cores, the electric cores are sequentially arranged at intervals, gaps are formed between the tops of the electric cores and the tops of the modules, and gaps are formed between the bottoms of the electric cores and the bottoms of the modules.

As a preferred scheme of battery pack, every the module still includes two horizontal partition beams and a plurality of vertical roof beam, every the second inlet has all been seted up on the lateral wall of module, the second inlet communicate in the feed liquor pipe, the second inlet is close to the bottom surface setting of shell, two horizontal partition beams set up respectively at both ends the electric core with between the lateral wall, a plurality of vertical roof beam sets up respectively between two adjacent electric cores, two adjacent set up a plurality of vertical roof beam between the electric core, adjacent form cooling runner between the vertical roof beam.

As a preferred scheme of the battery pack, a diaphragm is arranged in the shell, the distance between the diaphragm and the bottom surface of the shell is smaller than the height of the module, a plurality of assembly holes are formed in the diaphragm, and a plurality of assembly holes are correspondingly penetrated in the module one by one.

As a preferred scheme of battery pack, still include enclosing the frid, enclose the frid setting and be in the casing, enclose the frid with the casing encloses to establish and forms the ascending collecting vat of opening, every the second liquid outlet of module all through the pipeline intercommunication in the collecting vat, the collecting vat communicate in the drain pipe.

As a preferable scheme of the battery pack, the diaphragm plate is provided with a liquid collecting hole, the liquid collecting hole is positioned above the liquid collecting groove, and the liquid collecting hole is communicated with the liquid collecting groove.

As a preferable mode of the battery pack, the diaphragm is inclined toward the liquid collecting tank so that the cooling medium on the diaphragm flows into the liquid collecting tank; the diaphragm plate is provided with a runner groove, and the runner groove is arranged at the liquid collecting hole in a penetrating mode.

As a preferred scheme of the battery pack, the liquid level sensor is arranged in the liquid collecting tank so as to measure the liquid level in the liquid collecting tank, and the electromagnetic valve is arranged on the liquid outlet pipe.

The utility model has the beneficial effects that:

the utility model provides a battery pack, which comprises a shell and a plurality of modules, wherein a first liquid inlet and a first liquid outlet are formed in the shell, a liquid inlet pipe is arranged at the first liquid inlet in a penetrating manner, and a liquid outlet pipe is arranged at the first liquid outlet in a penetrating manner. The plurality of modules are all arranged in the shell, each module is internally provided with a containing cavity, and the containing cavity of each module is communicated with the liquid inlet pipe and the liquid outlet pipe so that the cooling medium flows in each containing cavity. The cooling medium directly flows into the module, the battery pack is not filled with the cooling medium, and the cooling of the module is realized, and meanwhile, the use amount of the cooling medium is greatly reduced, so that the weight of the battery pack is reduced. And as the battery pack is not filled with the cooling medium, the explosion-proof performance of the explosion-proof valve of the battery pack is not influenced, and the safety of the battery pack is ensured.

Drawings

Fig. 1 is a top view of a battery pack provided by an embodiment of the present utility model;

fig. 2 is a front view of a battery pack provided by an embodiment of the present utility model;

FIG. 3 is a top view of a module provided by an embodiment of the present utility model;

fig. 4 is a front view of a module provided by an embodiment of the present utility model.

In the figure:

1. a housing;

2. a module; 21. a housing; 22. a battery cell; 23. a transverse partition beam; 24. a vertical beam; 201. a thermal runaway burst orifice; 202. a cooling flow passage; 203. an upper cavity; 204. a lower cavity;

3. a liquid inlet pipe; 4. a liquid outlet pipe; 5. a diaphragm; 6. a groove surrounding plate; 7. a liquid level sensor; 8. a first communication pipe; 9. a second communicating pipe;

100. a liquid collecting tank.

Detailed Description

The technical scheme of the utility model is further described below with reference to the attached drawings and the embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

As shown in fig. 1-2, the battery pack of the present embodiment includes a housing 1 and a plurality of modules 2, and the number of modules 2 is not limited to that shown in the drawings. The shell 1 is provided with a first liquid inlet and a first liquid outlet, the liquid inlet pipe 3 is arranged at the first liquid inlet in a penetrating way, and the liquid outlet pipe 4 is arranged at the first liquid outlet in a penetrating way. The plurality of modules 2 are all arranged in the shell 1, each module 2 is internally provided with a containing cavity, and the containing cavity of each module 2 is communicated with the liquid inlet pipe 3 and the liquid outlet pipe 4 so that the cooling medium flows in each containing cavity.

The cooling medium in the battery pack directly flows into the module 2, the battery pack is not filled with the cooling medium, and the cooling of the module 2 is realized, meanwhile, the using amount of the cooling medium can be greatly reduced, and the weight of the battery pack is reduced. And as the battery pack is not filled with the cooling medium, the explosion-proof performance of the explosion-proof valve of the battery pack is not influenced, and the safety of the battery pack is ensured.

When thermal runaway occurs in the modules 2, in order to release heat in a directional manner, it is preferable that a thermal runaway firing port 201 is provided on a top cover of each module 2, the thermal runaway firing port 201 is a through hole, or a module explosion-proof valve is provided at the thermal runaway firing port 201.

As shown in fig. 3 to 4, preferably, a second liquid outlet is formed on the side wall of the housing 21 of each module 2, and the second liquid outlet is communicated with the liquid outlet pipe 4 through a second communicating pipe 9, and the second liquid outlet is arranged close to the top cover. I.e. the cooling medium flows to the upper part of the module 2 and can flow out of the module 2 when reaching the height of the second liquid outlet. Preferably, the second liquid outlet and the top cover are arranged at intervals, so that a certain space is reserved at the top of the accommodating cavity of the module 2, cooling medium cannot flow into the space, and the explosion-proof performance of the module explosion-proof valve on the top cover of the module 2 can be ensured to be stable.

In this embodiment, the width of the module 2 is greater than the height of the module 2 to minimize the hydraulic force required for the cooling medium to flow upward within the module 2, thereby reducing energy consumption.

As shown in fig. 3 and 4, each module 2 preferably includes a plurality of cells 22, the plurality of cells 22 are sequentially arranged at intervals, the top of the plurality of cells 22 has a gap with the top of the module 2, and the bottom of the plurality of cells 22 has a gap with the bottom of the module 2.

Preferably, each module 2 further comprises two transverse partition beams 23 and a plurality of vertical beams 24. Wherein, the second inlet has all been seted up on the lateral wall of every module 2, and the second inlet is through first connecting pipe 8 intercommunication in feed liquor pipe 3, and the second inlet is close to the bottom surface setting of shell 21, and the coolant can flow in from the lower part of module 2 promptly, and when the liquid level height of coolant reached the second liquid outlet, coolant flowed out. Optionally, the second liquid inlet and the second liquid outlet are arranged on the same side or on different sides, and can be adjusted according to the actual arrangement mode of the module 2, so that the pipeline arrangement is simplest, complex pipeline design is avoided, and the assembly difficulty is reduced.

The plurality of battery cells 22 are sequentially arranged at intervals along the same direction, the side walls of two sides of each battery cell 22 are respectively contacted with the side walls of the shell 21 of the module 2, and the lower parts of the battery cells 22 are not contacted with the bottom surface of the shell 21. The two transverse partition beams 23 are respectively arranged between the electric core 22 at two ends and the side wall of the shell 21, the two transverse partition beams 23 are horizontally arranged, and each side face is respectively in sealing contact with the shell 21 and the electric core 22, so that the containing cavity can be divided into an upper cavity 203 and a lower cavity 204 by the planes where the transverse partition beams 23 are arranged, cooling medium can be prevented from flowing into the space between the electric core 22 at two ends and the shell 21, the consumption of the cooling medium can be further reduced, more cooling medium can be ensured to flow between the adjacent electric cores 22, and the heat exchange efficiency between the cooling medium and the electric core 22 can be improved. And the arrangement of the transverse partition beams 23 can also prevent the battery cells 22 at the two ends from shifting.

The plurality of vertical beams 24 are respectively disposed between two adjacent cells 22, and the plurality of vertical beams 24 are disposed between two adjacent cells 22, and the adjacent vertical beams 24 are disposed at intervals, such that a cooling flow channel 202 is formed between the adjacent vertical beams 24. Of course, the vertical beam 24 can reduce the amount of cooling medium, increase the flow rate of the quantitative cooling medium, support the battery cells 22, prevent the battery cells 22 from shifting, and maintain a proper distance between the adjacent battery cells 22. Alternatively, both ends of the vertical beams 24 contact the top and bottom surfaces of the housing 21 of the module 2, respectively, to form a support for the housing 21 of the module 2.

As shown in fig. 2, preferably, a diaphragm 5 is disposed in the housing 1, the distance between the diaphragm 5 and the bottom surface of the housing 1 is smaller than the height of the module 2, a plurality of assembly holes are formed in the diaphragm 5, and a plurality of assembly holes are correspondingly formed in the module 2 in a penetrating manner. When the battery pack is subjected to vibration, and the module 2 is not provided with the module explosion-proof valve, a small amount of cooling medium can be splashed onto the diaphragm 5 from the thermal runaway eruption port 201 of the module 2, the arrangement of the diaphragm 5 can prevent the cooling medium from being present in the lower area of the diaphragm 5 in the battery pack, and the electric connection assembly can be arranged in the lower area of the battery pack, so that the use safety of the battery pack is further ensured.

In the present embodiment, the liquid inlet pipe 3 and the plurality of first communication pipes 8 are disposed below the diaphragm 5, and the plurality of second communication pipes 9 are disposed mostly above the diaphragm 5. Of course, in other embodiments, the position of the diaphragm 5 may be increased, and the plurality of second communication pipes 9 may be provided below the diaphragm 5. Can be adjusted according to the actual condition of the module, and is not limited herein.

Preferably, the battery pack further comprises a groove surrounding plate 6, the groove surrounding plate 6 is arranged in the shell 1, the groove surrounding plate 6 and the shell 1 enclose to form a liquid collecting groove 100 with an upward opening, the second liquid outlet of each module 2 is communicated with the liquid collecting groove 100 through a pipeline, namely, the second communicating pipe 9 is communicated with the liquid collecting groove 100, namely, the tail end of the second communicating pipe 9 stretches into the liquid collecting groove 100, the liquid collecting groove 100 is communicated with the liquid outlet pipe 4, and the position of the liquid outlet pipe 4 is located below the plane where the diaphragm 5 is located. That is, the cooling medium flowing out of the plurality of modules 2 is introduced into the liquid collecting tank 100 to be converged, and then flows out of the battery pack through the liquid outlet pipe 4.

Preferably, the diaphragm 5 is provided with a liquid collecting hole, the liquid collecting hole is located above the liquid collecting tank 100, the liquid collecting hole is communicated with the liquid collecting tank 100, so that excessive cooling medium splashed onto the diaphragm 5 can flow into the liquid collecting tank 100, and the tail end of the second communicating pipe 9 can extend into the liquid collecting tank 100 from the liquid collecting hole.

In order to allow the splashed cooling medium to rapidly flow into the sump 100, thereby reducing the need for tightness of the housing 1, it is preferable that the diaphragm 5 is inclined toward the sump 100, and the plate surface of the diaphragm 5 is gradually lowered in a direction toward the sump 100, so that the cooling medium on the diaphragm 5 flows into the sump 100. Of course, in some embodiments, the diaphragm 5 may be configured as a flat plate, in other embodiments, the diaphragm 5 may be configured as a curved plate, so that the higher the plate surface position of the diaphragm 5 contacting the housing 1, the lower the plate surface position of the diaphragm is, that is, the lower the plate surface position is at the center, so as to increase the speed of the cooling medium flowing into the liquid collecting tank 100 on the diaphragm 5, and prevent the inner wall of the housing 1 from contacting the cooling medium.

Preferably, the diaphragm 5 is provided with a runner groove (not shown in the figure), and the runner groove is penetrated to the liquid collecting hole, that is, the cooling medium will flow into the runner groove first, and then flow to the liquid collecting hole through the runner groove, that is, fall into the liquid collecting groove 100. The runner groove can be one or more straight line grooves, folding line grooves or curve grooves, and can also be a plurality of mutually communicated straight line grooves, folding line grooves or curve grooves so as to form a tree shape.

Preferably, in the present embodiment, the plate surface of the diaphragm 5 is smooth, so that the cooling medium flows into the runner groove quickly, and the groove bottom of the runner groove is smooth, so that the cooling medium flows into the liquid collecting groove 100 quickly.

Preferably, the battery pack further comprises a liquid level sensor 7 and a solenoid valve (not shown in the drawings), the liquid level sensor 7 is arranged in the sump 100, the liquid level sensor 7 is used for measuring the liquid level in the sump 100, and the solenoid valve is arranged on the drain pipe 4. The flow rate of the cooling medium in the liquid outlet pipe 4 can be regulated by the liquid level in the liquid collecting tank 100 so as to ensure the flow stability of the cooling medium and the cooling effect stability of the battery pack.

Preferably, the battery pack further includes a plurality of pipe supports (not shown), which fix the pipes so as not to be displaced with respect to the housing 1, to prevent the safety of the battery pack from being affected by the pipe removal, etc.

The cooling medium in the battery pack directly flows into the module 2, the battery pack is not filled with the cooling medium, and the cooling of the module 2 is realized, meanwhile, the using amount of the cooling medium can be greatly reduced, and the weight of the battery pack is reduced. And the battery pack is not filled with the cooling medium, so that the explosion-proof performance of the explosion-proof valve of the battery pack is not influenced, and the safety of the battery pack can be ensured.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. A battery pack, comprising:

the liquid inlet device comprises a shell (1), wherein a first liquid inlet and a first liquid outlet are formed in the shell (1), a liquid inlet pipe (3) penetrates through the first liquid inlet, and a liquid outlet pipe (4) penetrates through the first liquid outlet;

the cooling device comprises a plurality of modules (2), wherein the modules (2) are arranged in a shell (1), each module (2) is internally provided with a containing cavity, and each containing cavity of each module (2) is communicated with a liquid inlet pipe (3) and a liquid outlet pipe (4) so that cooling medium flows in each containing cavity.

2. The battery pack according to claim 1, wherein a thermal runaway firing port (201) is provided on a top cover of each module (2), the thermal runaway firing port (201) being a through hole, or a module explosion-proof valve is provided at the thermal runaway firing port (201).

3. The battery pack according to claim 2, wherein a second liquid outlet is formed in the side wall of the housing (21) of each module (2), the second liquid outlet is communicated with the liquid outlet pipe (4), and the second liquid outlet is arranged close to the top cover.

4. A battery pack according to claim 3, wherein each module (2) comprises a plurality of cells (22), the plurality of cells (22) are sequentially arranged at intervals, a gap is formed between the top of each cell (22) and the top of the module (2), and a gap is formed between the bottom of each cell (22) and the bottom of the module (2).

5. The battery pack according to claim 4, wherein each module (2) further comprises two transverse partition beams (23) and a plurality of vertical beams (24), each module (2) is provided with a second liquid inlet on the side wall, the second liquid inlet is communicated with the liquid inlet pipe (3), the second liquid inlet is close to the bottom surface of the shell (21), two transverse partition beams (23) are respectively arranged between the electric cores (22) at two ends and the side wall, a plurality of vertical beams (24) are respectively arranged between two adjacent electric cores (22), a plurality of vertical beams (24) are arranged between two adjacent electric cores (22), and a cooling flow channel (202) is formed between the adjacent vertical beams (24).

6. The battery pack according to claim 2, wherein a diaphragm (5) is arranged in the housing (1), the distance between the diaphragm (5) and the bottom surface of the housing (1) is smaller than the height of the module (2), a plurality of assembly holes are formed in the diaphragm (5), and the module (2) is correspondingly penetrated with the assembly holes one by one.

7. The battery pack according to claim 6, further comprising a surrounding groove plate (6), wherein the surrounding groove plate (6) is arranged in the shell (1), the surrounding groove plate (6) and the shell (1) are surrounded to form a liquid collecting groove (100) with an upward opening, a second liquid outlet of each module (2) is communicated with the liquid collecting groove (100) through a pipeline, and the liquid collecting groove (100) is communicated with the liquid outlet pipe (4).

8. The battery pack according to claim 7, wherein the diaphragm (5) is provided with a liquid collecting hole, the liquid collecting hole is located above the liquid collecting groove (100), and the liquid collecting hole is communicated with the liquid collecting groove (100).

9. The battery pack according to claim 8, wherein the diaphragm (5) is disposed obliquely toward the liquid collecting tank (100) so that the cooling medium on the diaphragm (5) flows into the liquid collecting tank (100); the diaphragm plate (5) is provided with a runner groove, and the runner groove penetrates through the liquid collecting hole.

10. The battery pack according to claim 7, further comprising a liquid level sensor (7) and a solenoid valve, the liquid level sensor (7) being disposed in the liquid sump (100) to measure the liquid level within the liquid sump (100), the solenoid valve being disposed on the liquid outlet pipe (4).