CN114725566A - Liquid cooling battery package and car - Google Patents

Abstract

The invention discloses a liquid-cooled battery pack and an automobile, wherein the liquid-cooled battery pack comprises a liquid-cooled system and a plurality of battery components, each battery component comprises an electric core and a liquid-cooled plate group, each liquid-cooled plate group comprises a liquid-cooled plate and at least two pipelines, the liquid-cooled plates and the electric cores are stacked and arranged, each liquid-cooled plate is provided with a containing cavity, the containing cavity is provided with two openings used for being communicated with the external environment, the two pipelines are respectively communicated with the two openings in a one-to-one correspondence mode to form liquid-cooled branches, the liquid-cooled branches of the plurality of battery components are connected to the liquid-cooled system in parallel, and liquid-cooled liquid flowing out of the liquid-cooled system returns to the liquid-cooled system after passing through the liquid-cooled branches to form a liquid-cooled loop. The invention aims to solve the problem that the performance of a battery is influenced because a liquid cooling structure is not designed in the existing new energy battery automobile. The invention can exchange heat uniformly and ensure that the liquid-cooled battery pack operates in a good working environment.

Description

Liquid-cooled battery packs and cars

technical field

The invention relates to the technical field of new energy vehicles, in particular to a liquid-cooled battery pack and an automobile.

Background technique

At present, the battery swap technology has greatly improved the efficiency of electric energy replenishment, extended the service life of the battery, and eliminated the anxiety of the cruising range, which has become a new driving force for the second take-off of the new energy vehicle industry in the future. However, there are still many bottlenecks in the development of new energy power exchange modes, especially the restriction of thermal management performance, which is a crucial factor affecting the performance of power batteries. The existing new energy vehicles are not designed with a liquid cooling structure, so the battery pack has huge defects. The power battery pack will generate a lot of heat during the driving and charging and discharging of the vehicle, which will cause the power battery to heat up and affect the performance of the battery, thereby reducing the power consumption. The cruising range of the vehicle in a high temperature or low temperature environment, the user experience is poor, and the performance quality of the new energy vehicle is reduced.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to propose a liquid-cooled battery pack and a vehicle, aiming to solve the problem that the current new energy battery vehicle does not have a liquid-cooled structure, which affects the performance of the battery.

In order to achieve the above purpose, a liquid-cooled battery pack proposed by the present invention includes:

liquid cooling systems; and,

A plurality of battery assemblies, each of the battery assemblies includes a battery cell and a liquid-cooling plate group, the liquid-cooling plate group includes a liquid-cooling plate and at least two pipelines, and the liquid-cooling plate and the battery core are stacked and arranged, so that the The liquid cooling plate is formed with a cavity, and the cavity is provided with two openings for communicating with the external environment, and the two pipelines are respectively connected with the two openings in a one-to-one correspondence to form a liquid cooling branch. The liquid-cooling branches of the battery assembly are connected in parallel to the liquid-cooling system, so that the liquid-cooling liquid flowing out of the liquid-cooling system flows through each of the liquid-cooling branches and returns to the liquid-cooling system, Constitutes a liquid cooling circuit.

Optionally, each of the battery assemblies includes two of the liquid-cooled plate groups, and the liquid-cooled plates of the two liquid-cooled plate groups are respectively arranged on opposite sides of the battery core, and are respectively the first liquid-cooled plate group. plate group and second liquid-cooled plate group;

In the plurality of battery assemblies, the liquid cooling branches of each of the first liquid cooling plate groups are sequentially connected in parallel and then connected to the liquid cooling system, and the liquid cooling branches of each of the second liquid cooling plate groups are connected in parallel. The branches are sequentially connected in parallel and then connected to the liquid cooling system.

Optionally, at least one of the pipelines of the plurality of first liquid-cooling plate groups and at least one of the pipelines of the plurality of second liquid-cooling plate groups are connected with a matching joint, so as to The liquid cooling branch of the first liquid cooling plate group and the liquid cooling branch of the second liquid cooling plate group are connected.

Optionally, in the pipelines of each of the battery assemblies, at least one of the pipelines includes a first pipe section and a second pipe section, wherein the material of the first pipe section is a flexible and bendable material, and the second pipe section The material is a rigid material.

Optionally, the liquid-cooling plate group further includes a partition, which is arranged in the cavity to separate a flow channel in the cavity, and the flow channel is used to circulate along the cooling liquid The direction is curved and extended.

Optionally, a plurality of the flow channels are provided, and the plurality of the flow channels are arranged in parallel along the first direction.

Optionally, the cavity includes a cavity segment that communicates with at least one of the openings, the cavity segment communicates with the flow channel openings of a plurality of the flow channels, and the flow channel openings of the plurality of flow channels are arranged side by side at the On one side of the cavity section, the opening is provided on the other side of the cavity section, and the flow cross-sectional areas of the flow channel openings of the plurality of flow channels are gradually reduced in the direction away from the opening.

Optionally, the liquid-cooled battery pack further includes thermally conductive adhesive disposed between the liquid-cooled plate and the battery core.

Optionally, the liquid-cooled battery pack further includes a casing, and the casing is formed with a cavity, and the cavity is used for accommodating a plurality of the battery components;

The liquid-cooled battery pack further includes a high-voltage connector and a liquid-cooled connector spaced along the first direction, the high-voltage connector and the liquid-cooled connector are arranged on the housing, and the high-voltage connector is connected to the The cells are electrically connected, the liquid cooling joint is connected to two of the pipelines in at least one of the liquid cooling branches, and the liquid cooling joint is connected to the liquid cooling system.

The present invention also provides an automobile, including the liquid cooling battery pack including the liquid cooling system and a plurality of battery assemblies, each of the battery assemblies including a battery cell and a liquid cooling plate group, the liquid cooling plate group including a liquid cooling plate and at least two pipelines, the liquid-cooling plate and the battery core are stacked and arranged, the liquid-cooling plate is formed with a cavity, and the cavity is provided with two openings for communicating with the external environment. The pipelines are respectively connected with the two openings in a one-to-one correspondence to form a liquid-cooling branch, and the liquid-cooling branches of the plurality of battery assemblies are connected in parallel to the liquid-cooling system to supply the liquid-cooling system The outflowing liquid cooling liquid flows through each of the liquid cooling branches and returns to the liquid cooling system to form a liquid cooling circuit.

In the technical solution of the present invention, each of the battery components includes a battery cell and a liquid-cooling plate group, the liquid-cooling plate group includes a liquid-cooling plate and at least two pipelines, and the liquid-cooling plate and the battery core are stacked and arranged. , so that the liquid-cooling plate is attached to the battery core and conducts heat exchange stably; the liquid-cooling plate is formed with a cavity, and the cavity is provided with two openings for communicating with the external environment. The pipelines are respectively connected with the two openings in a one-to-one correspondence to form a liquid-cooling branch, and the liquid-cooling branches of the plurality of battery assemblies are connected in parallel to the liquid-cooling system to supply the liquid-cooling system The outflowing liquid cooling liquid flows through each of the liquid cooling branches and returns to the liquid cooling system to form a liquid cooling circuit; thus, the liquid cooling liquid in the liquid cooling system flows from one of the plurality of liquid cooling plate groups. The pipeline flows into the corresponding liquid cooling plate, and then flows back to the liquid cooling system from another pipeline to perform heat exchange on the cells of the plurality of battery assemblies, thereby increasing the number of The uniformity of the temperature of the liquid cooling plate in the battery assembly reduces the risk of uneven temperature distribution of the battery pack.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a schematic perspective view of an embodiment of a liquid-cooled battery pack provided by the present invention;

FIG. 2 is a schematic diagram of the internal structure of the liquid cooling plate in FIG. 1;

3 is a schematic diagram of the internal three-dimensional structure of the liquid cooling plate in FIG. 1;

Fig. 4 is the enlarged schematic diagram of the part A of Fig. 3;

Fig. 5 is the sectional schematic diagram of the partial side view in Fig. 1;

FIG. 6 is a schematic perspective view of a liquid-cooled battery pack provided by the present invention (including a casing).

Description of reference numbers:

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indications are only used to explain a certain posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication also changes accordingly.

In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for the purpose of description, and should not be construed as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In addition, the meaning of "and/or" in the whole text includes three parallel schemes. Taking "A and/or B" as an example, it includes scheme A, scheme B, or scheme satisfying both of A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist. , is not within the scope of protection required by the present invention.

At present, the battery swap technology has greatly improved the efficiency of electric energy replenishment, extended the service life of the battery, and eliminated the anxiety of the cruising range, which has become a new driving force for the second take-off of the new energy vehicle industry in the future. However, there are still many bottlenecks in the development of new energy power exchange modes, especially the restriction of thermal management performance, which is a crucial factor affecting the performance of power batteries. The existing new energy vehicles are not designed with a liquid cooling structure, so the battery pack has huge defects. The power battery pack will generate a lot of heat during the driving and charging and discharging of the vehicle, which will cause the power battery to heat up and affect the performance of the battery, thereby reducing the power consumption. The cruising range of the vehicle in a high temperature or low temperature environment, the user experience is poor, and the performance quality of the new energy vehicle is reduced.

In view of this, the present invention provides a liquid-cooled battery pack, which can uniformly cool the batteries in the battery pack. FIGS. 1 to 6 are an embodiment of the liquid-cooled battery pack provided by the present invention.

Referring to FIGS. 1 , 3 and 5 , the liquid-cooled battery pack 100 includes a liquid-cooling system and a plurality of battery assemblies 1 . The cold plate group 12 includes a liquid cold plate 121 and at least two pipelines 122. The liquid cold plate 121 and the battery cells 11 are stacked and arranged. The liquid cold plate 121 is formed with a cavity 1211, and the cavity 1211 is provided with There are two openings 1212 for communicating with the external environment, and the two pipelines 122 are respectively connected with the two openings 1212 in a one-to-one correspondence to form a liquid cooling branch. The liquid cooling branches of the plurality of battery assemblies 1 The circuits are connected in parallel on the liquid cooling system, so that the liquid cooling liquid flowing out of the liquid cooling system flows through each of the liquid cooling branches and returns to the liquid cooling system to form a liquid cooling circuit.

In the technical solution of the present invention, each of the battery assemblies 1 includes a battery cell 11 and a liquid cooling plate group 12. The liquid cooling plate group 12 includes a liquid cooling plate 121 and at least two pipelines 122. The liquid cooling plate 121 It is stacked and arranged with the battery cells 11, so that the liquid cooling plate 121 is attached to the battery core 11 to perform heat exchange stably; the liquid cooling plate 121 is formed with a cavity 1211, and the cavity 1211 is provided with With two openings 1212 communicating with the external environment, the two pipelines 122 are respectively connected with the two openings 1212 in a one-to-one correspondence to form a liquid cooling branch. The liquid cooling branches of the plurality of battery assemblies 1 It is connected in parallel to the liquid cooling system, so that the liquid cooling liquid flowing out of the liquid cooling system flows through each of the liquid cooling branches and returns to the liquid cooling system to form a liquid cooling circuit; thus the liquid cooling system The liquid cooling liquid in the liquid cooling system flows from one of the pipelines 122 of the plurality of the liquid-cooling plate groups 12 into the corresponding liquid-cooling plate 121, and then flows back to the liquid-cooling system from the other pipeline 122, The heat exchange of the cells 11 of the plurality of battery assemblies 1 improves the temperature uniformity of the liquid cooling plates 121 in the plurality of the battery assemblies 1 and reduces the risk of uneven temperature distribution of the battery packs .

In order to improve the efficiency of heat exchange, in this embodiment, referring to FIG. 1 , each of the battery assemblies 1 includes two liquid cooling plate groups 12 , and the liquid cooling plates 121 of the two liquid cooling plate groups 12 They are respectively arranged on opposite sides of the battery core 11, and are respectively a first liquid cooling plate group and a second liquid cooling plate group. The liquid cooling plate 121 of the first liquid cooling plate group is attached to the battery core. 11, the liquid cooling plate 121 of the second liquid cooling plate group is attached to the lower side of the cell 11, so that the upper and lower sides of the cell 11 are attached with the The liquid cooling plate 121 improves the heat exchange efficiency, so that the temperature distribution of the liquid cooling battery pack 100 is more uniform during the heat exchange process; and in the plurality of battery assemblies 1, all the first liquid cooling plate groups The liquid-cooling branches are sequentially connected in parallel and then connected to the liquid-cooling system, and the liquid-cooling branches of each of the second liquid-cooling plate groups are sequentially connected in parallel and then connected to the liquid-cooling system. A part of the liquid cooling liquid of the liquid cooling system flows back into the liquid cooling system after passing through the liquid cooling branches of the plurality of first liquid cooling plate groups in sequence, and another part of the liquid cooling liquid of the liquid cooling system , and then flow back into the liquid cooling system after passing through the liquid cooling branches of the second liquid cooling plate groups in sequence, so that the liquid cooling plates corresponding to the upper surfaces of the battery cells 11 121 and the middle liquid cooling liquid of the liquid cooling plate 121 corresponding to the lower surface are all direct current from the liquid cooling system, which ensures the uniformity of the temperature of the battery core 11, improves the heat exchange efficiency, and enhances the performance of the new energy vehicle. Performance quality.

Specifically, please continue to refer to FIG. 1 , in order to strengthen the connection between the liquid cooling branches, at least one of the pipelines 122 of the plurality of first liquid cooling plate groups and a plurality of the second liquid cooling plate groups A matching joint is connected between at least one of the pipelines 122 to connect the liquid cooling branch of the first liquid cooling plate group with the liquid cooling branch of the second liquid cooling plate group , so that only one of the liquid-cooling branches of the first liquid-cooling plate group is required to communicate with the liquid-cooling system, or one of the liquid-cooling branches of the second liquid-cooling plate group needs to be connected to the The liquid cooling system connection can connect the entire liquid cooling circuit with the liquid cooling system; in this way, the connection between the pipelines 122 in the liquid cooling circuit is reduced, and the multiple pipelines 122 are simplified Connection with the liquid cooling plate 121 and the liquid cooling system.

More specifically, the present invention does not limit the number of the liquid cooling plate group 12, as long as it can match the number of the battery cells 11. In this embodiment, the first liquid cooling plate group is set to three. two of the pipelines 122 of the first liquid-cooling plate group on both sides are communicated with the liquid cooling system, so as to form a liquid inlet and a liquid outlet on the two pipelines 122; The joint is further divided into a connecting joint 31 and a shunt joint 32. The connecting joint 31 is provided at the opening 1212 of the liquid cooling plate 121, and two adjacent first liquid cooling plate groups or two The pipes on the same side of the second liquid-cooling plate group are connected through the connecting joint 31, so that a plurality of the first liquid-cooling plate groups or a plurality of the second liquid-cooling plate groups are arranged in parallel; the The split joint 32 is used to connect the pipelines 122 located on the same side of the two adjacent first liquid-cooling plate groups and one pipeline 122 of the second liquid-cooling plate group, or used for Connect the pipelines 122 on the same side of two adjacent second liquid-cooling plate groups and one pipeline 122 in one of the second liquid-cooling plate groups, so as to connect the first liquid-cooling plate group and the The second liquid-cooling plate group is connected in parallel and then connected to the liquid-cooling system, so that the liquid-cooling liquid of the liquid-cooling system enters the pipeline 122 from the liquid inlet and passes through the connecting joint 31 and the The split joints 32 respectively enter the adjacent liquid cooling plates 121 of the first liquid cooling plate group and the liquid cooling plates 121 of the second liquid cooling plate group, so as to pass through all the liquid cooling plates. For the cold plate 121, since the plurality of liquid cold plates 121 are connected in parallel, the temperature of the liquid cooling liquid entering each of the liquid cold plates 121 is guaranteed to be consistent, the heat exchange efficiency is improved, and the uniformity of the heat exchange of the battery pack is improved. .

In this embodiment, referring to FIG. 1 , among the pipelines 122 of the battery assemblies 1 , at least one pipeline 122 includes a first pipeline section 1221 and a second pipeline section 1222 , wherein the first pipeline section 1221 has The material is a flexible and bendable material, and the material of the second pipe section 1222 is a rigid material; the first pipe section 1221 is set to a flexible and bendable material, so that the deformation of the first pipe section 1221 can facilitate the liquid For the connection between the cold plates 121, the second pipe section 1222 is made of a rigid material, so as to enhance the stability of the connection between the liquid cold plates 121 and reduce the battery assembly 1 during travel or vehicle collision. vibrations between.

It should be noted that the first pipe section 1221 can be used to connect the two liquid cooling plates 121 that are arranged opposite to each other in the up-down direction, and the second pipe section 1222 can be used to connect the two liquid cooling plates 121 that are spaced apart along the first direction. The cold plate 121 can enhance the stability of the entire liquid cooling circuit and facilitate the connection and installation of the liquid cooling plates 121 .

Specifically, the first pipe section 1221 can be configured as a corrugated pipe, the corrugated pipe can be deformed and has a certain amount of shrinkage, which can absorb tolerances during installation and facilitate installation; the second pipe section 1222 is configured as a hard straight pipe, The stability is strong and the vibration is small. The bellows and the rigid straight pipes are flexibly installed on the openings 1212 of the liquid cooling plates 121, which makes the connection and installation between the liquid cooling branches easier. , and the stability of the entire liquid cooling circuit is good.

In order to further improve the uniformity of heat exchange of each of the liquid cooling plates 121, referring to FIG. 2, the liquid cooling plate group 12 further includes a partition 4, and the partition 4 is arranged in the cavity 1211 so that the The cavity 1211 is divided into a flow channel 41, and the flow channel 41 is used to extend and bend along the flow direction of the cooling liquid. Specifically, in this embodiment, the two openings 1212 of the liquid cooling plate 121 are Located on opposite sides of the liquid cooling plate 121 and arranged in a staggered manner, the two sides of the liquid cooling plate 121 are divided into a first side and a second side; After entering the liquid cooling plate 121, it flows toward the second side, and then flows toward the first side after one bend, and flows from the opening of the second side after the second bend. 1212 flows out; the shape of the flow channel 41 is an “S” shape, and the flow channel 41 is lengthened to enhance the heat exchange performance of the liquid cooling plate 121 .

Further, referring to FIG. 3 , a plurality of the flow channels 41 are provided, and the plurality of the flow channels 41 are arranged in parallel along the first direction; The liquid cooling liquid entering the opening 1212 can flow through the plurality of the flow channels 41 to perform heat exchange, so that the heat exchange efficiency can be improved while the heat exchange uniformity is improved.

Since the flow channel port 411 that is closer to the opening 1212 receives a larger impulse, the corresponding flow rate will be larger. In order to balance the flow rate, further, in this embodiment, referring to FIG. 4 , the cavity 1211 includes a cavity section 1213 that communicates with at least one of the openings 1212, the cavity section 1213 communicates with the flow channel openings 411 of the plurality of flow channels 41, and the flow channel openings 411 of the plurality of flow channels 41 are arranged side by side in the On one side of the cavity section 1213 , the opening 1212 is provided on the other side of the cavity section 1213 , and the flow cross-sectional area of the flow channel openings 411 of the plurality of flow channels 41 gradually increases in the direction away from the opening 1212 . The setting is reduced, so that the impulses in the flow passage openings 411 of the plurality of flow passages 41 can be kept as consistent as possible, so that the flow rates in the flow passages 41 can be kept as consistent as possible, and the heat exchange efficiency can be further improved. Evenness.

It should be noted that the two openings 1212 of the cavity 1211 are provided with communicating cavity segments 1213, so that the two openings 1212 of the liquid cooling plate 121 correspond to all the openings 1212 entering the liquid cooling liquid. The flow rates of the plurality of flow passages 411 at the opening 1212 are kept the same, and the flow rates of the plurality of flow passages 411 corresponding to the openings 1212 from which the liquid cooling liquid flows out are kept the same, so that the liquid cooling liquid flows more evenly from the plurality of flow passages 411. The flow channel 41 flows through.

In this embodiment, referring to FIG. 5 , the liquid-cooled battery pack 100 further includes a thermally conductive adhesive 5 , which is disposed between the liquid-cooled plate 121 and the battery core 11 , so that the thermally-conductive adhesive 5 attaches the liquid-cooled plate to the 121 is fixedly mounted on the battery core 11 , and the thermally conductive adhesive 5 is coated between the battery core 11 and the liquid cooling plate 121 to realize the connection between the liquid cooling plate 121 and the battery core 11 . The connection is fixed and the heat is conducted, the height space of the liquid-cooled battery pack 100 is fully utilized, the space occupation is reduced under the condition of effective heat conduction, and the structure is more compact.

It should be noted that the liquid cooling system can also provide heat transfer liquid, which can still flow through a plurality of the liquid cooling branches to form a liquid cooling circuit, and conduct heat conduction for each of the battery cells 11, so that the temperature is low Adjust the working environment of the liquid-cooled battery pack 100 at the time.

In this embodiment, referring to FIG. 6 , the liquid-cooled battery pack 100 further includes an outer casing 6, and the outer casing 6 is formed with a cavity, and the cavity is used for accommodating the plurality of the battery assemblies 1; The liquid-cooled battery pack 100 further includes a high-voltage connector 71 and a liquid-cooled connector 72 spaced along the first direction. The high-voltage connector 71 and the liquid-cooled connector 72 are arranged on the housing 6, and the high-voltage connector The connector 71 is electrically connected to the battery cell 11 , the liquid cooling connector 72 is connected to the two pipelines 122 in at least one of the liquid cooling branches, and the liquid cooling connector 72 is connected to the Liquid cooling system; when the vehicle enters the power station, the two-way stop valve of the liquid cooling system will be automatically closed to disconnect the liquid cooling system from the liquid cooling circuit to realize the disassembly of the liquid cooling battery pack 100; or The two-way shut-off valve of the cooling system is automatically opened, allowing the liquid cooling system to be reconnected with the liquid cooling circuit to realize the installation of the liquid cooling battery pack 100; in this way, the structure is simple, the operation is convenient, and the liquid cooling battery pack 100 can be quickly installed. Replacement, through the liquid cooling connector 72 and the high-voltage connector 71 to achieve intelligent and safe "vehicle-electric separation".

It should be noted that the housing 6 is further provided with a locking structure 73 , through which the liquid-cooled battery pack 100 is installed on the body of the vehicle, and can be reliably locked and quickly unlocked, which not only improves the efficiency , but also to ensure the accuracy of battery installation.

The present invention also provides an automobile, including the liquid-cooled battery pack 100. The specific structure of the liquid-cooled battery pack 100 refers to the above-mentioned embodiments. Since the automobile adopts all the technical solutions of all the above-mentioned embodiments, it also has the All the beneficial effects brought by the technical solutions of the above embodiments will not be repeated here.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, any equivalent structural transformations made by the contents of the description and drawings of the present invention, or direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (10)

1. A liquid-cooled battery pack, comprising: liquid cooling systems; and, A plurality of battery assemblies, each of the battery assemblies includes a battery cell and a liquid-cooling plate group, the liquid-cooling plate group includes a liquid-cooling plate and at least two pipelines, and the liquid-cooling plate and the battery core are stacked and arranged, so that the The liquid cooling plate is formed with a cavity, and the cavity is provided with two openings for communicating with the external environment, and the two pipelines are respectively connected with the two openings in a one-to-one correspondence to form a liquid cooling branch. The liquid-cooling branches of the battery assembly are connected in parallel to the liquid-cooling system, so that the liquid-cooling liquid flowing out of the liquid-cooling system flows through each of the liquid-cooling branches and returns to the liquid-cooling system, Constitutes a liquid cooling circuit. 2 . The liquid-cooled battery pack according to claim 1 , wherein each of the battery assemblies comprises two of the liquid-cooled plate groups, and the liquid-cooled plates of the two liquid-cooled plate groups are respectively arranged in the The opposite sides of the cell are respectively the first liquid-cooling plate group and the second liquid-cooling plate group; In the plurality of battery assemblies, the liquid cooling branches of each of the first liquid cooling plate groups are sequentially connected in parallel and then connected to the liquid cooling system, and the liquid cooling branches of each of the second liquid cooling plate groups are connected in parallel. The branches are sequentially connected in parallel and then connected to the liquid cooling system. 3 . The liquid-cooled battery pack according to claim 2 , wherein at least one of the pipelines of the plurality of first liquid-cooled plate groups and at least one of the plurality of second liquid-cooled plate groups. 4 . A matching joint is connected between the pipelines to connect the liquid cooling branch of the first liquid cooling plate group and the liquid cooling branch of the second liquid cooling plate group. 4 . The liquid-cooled battery pack according to claim 1 , wherein, in the pipelines of each battery assembly, at least one pipeline comprises a first pipe section and a second pipe section, wherein the first pipe section The material of the pipe section is a flexible and bendable material, and the material of the second pipe section is a rigid material. 5 . The liquid-cooled battery pack according to claim 1 , wherein the liquid-cooled plate group further comprises a separator, and the separator is arranged in the cavity to separate a partition in the cavity. 6 . The flow channel is used to extend and bend along the flow direction of the cooling liquid. 6 . The liquid-cooled battery pack according to claim 5 , wherein a plurality of the flow channels are provided, and the plurality of the flow channels are arranged in parallel along the first direction. 7 . 7 . The liquid-cooled battery pack according to claim 6 , wherein the cavity comprises a cavity section communicating with at least one of the openings, and the cavity section communicates with the flow channel openings of the plurality of flow channels. 8 . , the flow channel openings of the plurality of flow channels are arranged side by side on one side of the cavity segment, the openings are arranged on the other side of the cavity segment, and the flow cross-sectional areas of the flow channel openings of the plurality of flow channels are far away from The openings are gradually reduced in the direction of the openings. 8 . The liquid-cooled battery pack according to claim 1 , wherein the liquid-cooled battery pack further comprises a thermally conductive adhesive disposed between the liquid-cooled plate and the battery cells. 9 . 9 . The liquid-cooled battery pack according to claim 1 , wherein the liquid-cooled battery pack further comprises a casing, the casing is formed with a cavity, and the cavity is used for accommodating a plurality of the battery components. 10 . ; The liquid-cooled battery pack further includes a high-voltage connector and a liquid-cooled connector spaced along the first direction, the high-voltage connector and the liquid-cooled connector are arranged on the housing, and the high-voltage connector is connected to the The cells are electrically connected, the liquid cooling joint is connected to two of the pipelines in at least one of the liquid cooling branches, and the liquid cooling joint is connected to the liquid cooling system. 10. An automobile, characterized by comprising the liquid-cooled battery pack according to any one of claims 1-9.

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