CN220290895U

CN220290895U - Battery pack and vehicle

Info

Publication number: CN220290895U
Application number: CN202320351555.5U
Authority: CN
Inventors: 王亚坤; 徐超; 蒋雷雷
Original assignee: Beijing CHJ Automobile Technology Co Ltd
Current assignee: Beijing CHJ Automobile Technology Co Ltd
Priority date: 2023-02-28
Filing date: 2023-02-28
Publication date: 2024-01-02
Anticipated expiration: 2033-02-28

Abstract

The present disclosure relates to a battery pack including a case and a battery cutoff unit disposed in the case; at least one side of the battery cutting unit is provided with a first liquid cooling structure, and the first liquid cooling structure is in heat exchange contact with the side wall of the battery cutting unit so as to radiate the battery cutting unit, so that working heat of the battery cutting unit can be transferred to the first liquid cooling structure for heat exchange, that is, the battery cutting unit can be radiated and cooled through the first liquid cooling structure, and therefore heat exchange efficiency of the battery cutting unit is improved, and radiating performance is good. In addition, when the battery cutting unit is subjected to heat dissipation and cooling through the first liquid cooling structure, the heat dissipation and cooling of the high-voltage device in the battery cutting unit are realized, so that the cross-sectional area and the selected model of the high-voltage device can be reduced under the condition of the same overcurrent capacity, and the lightweight design and the cost reduction are facilitated.

Description

Battery pack and vehicle

Technical Field

The disclosure relates to the technical field of vehicles, in particular to a battery pack and a vehicle.

Background

A battery shut-off unit (Battery Disconnect Unit, abbreviated as BDU) is provided in the battery pack, and the BDU includes a housing and a high-voltage device, such as a relay, a pre-charge contactor, etc., provided in the housing. The BDU is used as a device for switching on and switching off high-voltage power battery pack of the new energy automobile, plays a vital role in the safety of the battery pack, and is a key component on the new energy automobile.

However, in the prior art, the heat dissipation performance of the BDU is poor, in order to ensure the overcurrent capability of the high-voltage device, the sectional area of the copper bar of the high-voltage device is generally increased or a large model is selected, which results in a large volume and a large weight of the BDU.

Disclosure of Invention

In order to solve the technical problems, the present disclosure provides a battery pack and a vehicle.

In a first aspect, the present disclosure provides a battery pack including a case and a battery cutoff unit disposed in the case;

at least one side of the battery cutting unit is provided with a first liquid cooling structure, and the first liquid cooling structure is in heat exchange contact with the side wall of the battery cutting unit so as to radiate heat of the battery cutting unit.

Optionally, the first liquid cooling structure includes a first liquid cooling plate, a first water inlet pipe and a first water outlet pipe;

the first liquid cooling plate is internally provided with a flow channel cavity for accommodating cooling liquid, and the first water inlet pipe and the first water outlet pipe are respectively communicated with the flow channel cavity.

Optionally, the first liquid cooling plate includes a first sub-plate and a second sub-plate which are oppositely arranged;

the first sub-board is arranged towards the battery cutting unit and is in heat exchange contact with the side wall of the battery cutting unit, and the first sub-board and the second sub-board are connected together and jointly enclose to form the flow channel cavity.

Optionally, at least one buffer slot facing the first daughter board is formed in the second daughter board, the buffer slot extends in a direction from an outlet of the first water inlet pipe to an inlet of the first water outlet pipe, and one end of the buffer slot facing the first daughter board is in sealing connection with the first daughter board, so that the runner cavity is divided into at least two subchambers which are mutually communicated.

Optionally, the first sub-board and the side wall of the battery cutting unit, which faces the first sub-board, are integrally formed.

Optionally, the shape of the first sub-board matches the shape of the side wall of the battery cutting unit facing the first sub-board.

Optionally, a water inlet nozzle and a water outlet nozzle which are communicated with the flow channel cavity are arranged on the first liquid cooling plate;

the water inlet nozzle and the water outlet nozzle are respectively arranged at two opposite ends of the first liquid cooling plate, the first water inlet pipe is communicated with the water inlet nozzle, and the first water outlet pipe is communicated with the water outlet nozzle.

Optionally, a heat conducting piece is arranged between the first liquid cooling structure and the battery cutting unit, and the heat conducting piece is in heat exchange contact with the outer wall of the first liquid cooling structure and the side wall of the battery cutting unit.

Optionally, the battery pack further comprises a battery cell module arranged in the box body and a second liquid cooling structure in heat exchange contact with the battery cell module;

the second liquid cooling structure comprises a second liquid cooling plate in heat exchange contact with the battery cell module, and a second water inlet pipe and a second water outlet pipe which are respectively communicated with the inner cavity of the second liquid cooling plate, a water inlet of the first liquid cooling structure is communicated with the second water inlet pipe, and a water outlet of the first liquid cooling structure is communicated with the second water outlet pipe.

In a second aspect, the present disclosure also provides a vehicle including the battery pack described above.

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

the battery pack and the vehicle provided by the disclosure are characterized in that the first liquid cooling structure is arranged on at least one side of the battery cutting unit in the battery pack, and the first liquid cooling structure is in heat exchange contact with the side wall of the battery cutting unit, so that the working heat of the battery cutting unit can be transferred to the first liquid cooling structure for heat exchange, that is, the battery cutting unit can be subjected to heat dissipation and cooling through the first liquid cooling structure, and therefore the heat exchange efficiency of the battery cutting unit is improved, and the heat dissipation performance is good. In addition, when the battery cutting unit is subjected to heat dissipation and cooling through the first liquid cooling structure, the heat dissipation and cooling of the high-voltage device in the battery cutting unit are realized, so that the cross-sectional area and the selected model of the high-voltage device can be reduced under the condition of the same overcurrent capacity, and the lightweight design and the cost reduction are facilitated.

Drawings

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

In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.

Fig. 1 is an assembly schematic diagram of a first liquid cooling structure, a heat conducting member, and a battery cutting unit of a battery pack according to an embodiment of the disclosure;

FIG. 2 is an isometric view of a first liquid cooling configuration of a battery pack according to an embodiment of the present disclosure;

FIG. 3 is a bottom view of a first liquid cooling structure of a battery pack according to an embodiment of the present disclosure;

FIG. 4 is an assembly schematic diagram of a first liquid-cooled structure and a second liquid-cooled structure of a battery pack according to an embodiment of the disclosure;

fig. 5 is a partially exploded view of a battery pack according to an embodiment of the present disclosure.

1, a battery cutting unit; 11. a housing; 2. a first liquid cooling structure; 21. a first liquid cooling plate; 211. a first sub-board; 212. a second sub-board; 22. a first water inlet pipe; 23. a first water outlet pipe; 3. a buffer tank; 41. a water inlet nozzle; 42. a water outlet nozzle; 5. a heat conductive member; 6. a second liquid cooling structure; 61. a second liquid cooling plate; 62. a second water inlet pipe; 63. a second water outlet pipe; 7. and a battery cell module.

Detailed Description

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

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.

Referring to fig. 1 to 5, the present embodiment provides a battery pack, which may be used for a new energy vehicle, for example.

Specifically, the battery pack includes a case (not shown) and a battery shut-off unit 1 provided in the case. The battery shut-off unit 1 includes a case 11 having a receiving chamber therein, and a high-voltage device (not shown), such as a relay, a pre-charge contactor, etc., disposed in the receiving chamber. The battery shut-off unit 1 is a device for turning on and off high-voltage power from the battery pack, and plays a critical role in the safety of the battery pack.

In particular, at least one side of the battery cutting unit 1 is provided with a first liquid cooling structure 2, and the first liquid cooling structure 2 is in heat exchange contact with a side wall of the battery cutting unit 1 so as to radiate heat of the battery cutting unit 1.

That is, the first liquid cooling structure 2 is located outside the battery cutting unit 1 and is in heat exchange contact with the outer wall of the housing 11 of the battery cutting unit 1, so that the working heat of the battery cutting unit 1 can be transferred to the first liquid cooling structure 2 for heat exchange, and therefore the working heat of the battery cutting unit 1 can be radiated and cooled through the first liquid cooling structure 2, and further the working heat of the high-voltage device in the battery cutting unit 1 can be radiated and cooled.

In some implementations, as shown in fig. 1, 4, and 5, a first liquid cooling structure 2 is provided at the top end of the battery cutting unit 1, and the first liquid cooling structure 2 is in heat exchange contact with the top surface of the housing 11 of the battery cutting unit 1.

In other implementations, a first liquid cooling structure 2 is disposed at the bottom end of the battery cutting unit 1, and the first liquid cooling structure 2 is in heat exchange contact with the bottom surface of the housing 11 of the battery cutting unit 1.

Of course, in other implementations, the first liquid cooling structure 2 may be disposed at both the top and bottom ends of the battery cutting unit 1, or the first liquid cooling structure 2 may be disposed at the left and right sides of the battery cutting unit 1.

According to the battery pack provided by the embodiment, the first liquid cooling structure 2 is arranged on at least one side of the battery cutting unit 1 in the battery pack, and the first liquid cooling structure 2 is in heat exchange contact with the side wall of the battery cutting unit 1, so that the working heat of the battery cutting unit 1 can be transferred to the first liquid cooling structure 2 for heat exchange, that is, the battery cutting unit 1 can be subjected to heat dissipation and cooling through the first liquid cooling structure 2, and therefore the heat exchange efficiency of the battery cutting unit 1 is improved, and the heat dissipation performance is good. In addition, the first liquid cooling structure 2 is used for cooling the battery cutting unit 1, and meanwhile cooling the high-voltage device in the battery cutting unit 1, so that the cross section area and the selected model of the high-voltage device can be reduced under the condition of the same overcurrent capacity, and the lightweight design and the cost reduction are facilitated.

In some embodiments, referring to fig. 1 to 3, the first liquid cooling structure 2 includes a first liquid cooling plate 21, a first water inlet pipe 22, and a first water outlet pipe 23, where the first liquid cooling plate 21 has a flow channel cavity for accommodating a cooling liquid therein, and the first water inlet pipe 22 and the first water outlet pipe 23 are respectively communicated with the flow channel cavity.

In particular, the first liquid cooling plate 21 may be, for example, an aluminum plate, and has excellent heat conduction performance, which is helpful for improving the heat transfer efficiency between the battery cutting unit 1 and the first liquid cooling structure 2, and further improving the heat exchange efficiency and heat dissipation performance of the battery cutting unit 1.

The first liquid cooling plate 21 may be integrally formed by a stamping process, for example, and has high structural strength.

When the battery cutting unit is specifically used, cooling liquid enters the flow channel cavity through the first water inlet pipe 22, flows in the flow channel cavity and flows out of the flow channel cavity through the first water outlet pipe 23, and as the first liquid cooling structure 2 is in heat exchange contact with the battery cutting unit 1, the cooling liquid can take away working heat of the battery cutting unit 1 in the flow channel cavity, so that the heat dissipation and cooling of the battery cutting unit 1 are realized, the heat exchange efficiency and the heat dissipation performance of the battery cutting unit 1 are improved, and the cross section area and the selected model of a high-voltage device can be reduced under the condition that the overcurrent capacity is the same, and the battery cutting unit is beneficial to lightweight design and cost reduction.

In some embodiments, referring to fig. 1 to 5, the first liquid cooling plate 21 includes a first sub-plate 211 and a second sub-plate 212 that are disposed opposite to each other, the first sub-plate 211 is disposed toward the battery cutoff unit 1 and is in heat exchanging contact with a side wall of the battery cutoff unit 1, and the first sub-plate 211 and the second sub-plate 212 are connected together and together enclose a flow channel cavity.

That is, the first liquid cooling plate 21 includes a first sub-plate 211 and a second sub-plate 212 connected together, and the first sub-plate 211 and the second sub-plate 212 enclose together to form a flow channel cavity, which is convenient for assembly and flexible in layout.

Wherein the first sub-board 211 and the second sub-board 212 may be welded together, for example, by brazing.

In some embodiments, referring to fig. 1, 2, 4 and 5, at least one buffer slot 3 recessed toward the first sub-board 211 is formed on the second sub-board 212 (the sub-board of the first liquid cooling board 21 facing away from the battery cutting unit 1), the buffer slot 3 extends in a direction from the outlet of the first water inlet pipe 22 to the inlet of the first water outlet pipe 23, and one end of the buffer slot 3 facing the first sub-board 211 is in sealing connection with the first sub-board 211 to divide the flow channel cavity into at least two sub-cavities that are mutually communicated.

In particular, when the first liquid cooling plate 21 is provided with the water inlet nozzle 41 and the water outlet nozzle 42 which are communicated with the flow channel cavity, the water inlet nozzle 41 and the water outlet nozzle 42 are respectively arranged at two opposite ends of the first liquid cooling plate 21, for example, the water inlet nozzle 41 and the water outlet nozzle 42 are respectively arranged at two ends of the first liquid cooling plate 21 along the length direction of the first liquid cooling plate, the water inlet nozzle 41 is communicated with the outlet of the first water inlet pipe 22, and the water outlet nozzle 42 is communicated with the inlet of the first water outlet pipe 23.

The buffer tank 3 extends along the direction from the outlet of the first water inlet pipe 22 to the inlet of the first water outlet pipe 23, which can be specifically understood that the buffer tank 3 extends along the direction from the water inlet nozzle 41 to the water outlet nozzle 42, that is, the buffer tank 3 extends along the length direction of the first liquid cooling plate 21, so that at least two sub-cavities which are mutually communicated are formed between the first water inlet pipe 22 and the first water outlet pipe 23, the occurrence of the swelling phenomenon of the runner cavity is avoided to a certain extent, the use safety of the first liquid cooling plate 21 is improved, and the service life of the first liquid cooling plate 21 is prolonged.

In some implementations, the second daughter board 212 is provided with a plurality of buffer slots 3, each buffer slot 3 extends along the length direction of the first liquid cooling plate 21, and the plurality of buffer slots 3 are spaced along the width direction of the first liquid cooling plate 21.

Wherein the groove wall of each buffer groove 3 extends inward from the second sub-board 212 toward the direction approaching the first sub-board 211, thereby forming the buffer groove 3 concavely provided inward on the second sub-board 212.

In some implementations, the end of the buffer tank 3 facing the first sub-board 211 is formed as a blocking surface, i.e. the tank bottom of the buffer tank 3 is a blocking surface, which is in sealing connection with the first sub-board 211.

In other implementations, the end of the buffer tank 3 facing the first sub-board 211 is formed as an open end, i.e., the tank bottom of the buffer tank 3 is open, and the open end is in sealing connection with the first sub-board 211.

In some embodiments, the first sub-plate 211 (the sub-plate of the first liquid cooling plate 21 facing the battery cutoff unit 1) is integrally formed with the side wall of the battery cutoff unit 1 facing the first sub-plate 211.

Illustratively, the first sub-board 211 is located at the top of the battery cutting unit 1, and the first sub-board 211 and the top wall of the housing 11 of the battery cutting unit 1 are integrally formed, that is, the first sub-board 211 and the top wall of the battery cutting unit 1 are combined into a whole structure, at this time, the second sub-board 212 is assembled on the top wall of the battery cutting unit 1 to form the first liquid cooling board 21, and the top wall of the battery cutting unit 1 and the second sub-board 212 are enclosed together to form a flow channel cavity, which is convenient for assembly, has the function of reducing the number of parts, and is helpful for improving the assembly efficiency.

In some embodiments, referring to fig. 1 to 5, the shape of the first sub-board 211 is matched with the shape of the side wall of the battery cutting unit 1 facing the first sub-board 211, so that the battery cutting unit 1 has good aesthetic property, and the first sub-board 211 has good fit with the battery cutting unit 1, thereby improving the heat exchange efficiency and heat dissipation performance of the battery cutting unit 1.

In some embodiments, referring to fig. 1 to 5, a water inlet nozzle 41 and a water outlet nozzle 42 which are communicated with the runner cavity are formed on the first liquid cooling plate 21, the water inlet nozzle 41 and the water outlet nozzle 42 are respectively arranged at two opposite ends of the first liquid cooling plate 21, the first water inlet pipe 22 is communicated with the water inlet nozzle 41, and the first water outlet pipe 23 is communicated with the water outlet nozzle 42.

A water inlet nozzle 41 for communicating with the first water inlet pipe 22 and a water outlet nozzle 42 for communicating with the first water outlet pipe 23 are arranged on the first liquid cooling plate 21, so that the transportation and the assembly are convenient.

Wherein, divide water inlet nozzle 41 and water outlet nozzle 42 to establish at the opposite both ends of first liquid cooling board 21 for the coolant liquid gets into from the one end in runner chamber, and the coolant liquid flows out from the other end in runner chamber after flowing through in the runner chamber, has prolonged the extension length in runner chamber to a certain extent, has increased the circulation path of coolant liquid in first cooling board, has further improved heat exchange efficiency and the heat dispersion of battery cutting-off unit 1.

In some implementations, referring to fig. 1, the buffer tank 3 is formed as a linear tank in a direction along the water inlet nozzle 41 to the water outlet nozzle 42.

In other implementations, the buffer tank 3 is formed as a curved tank in the direction from the water inlet nozzle 41 to the water outlet nozzle 42, and the extension length of the flow passage chamber can be increased without changing the overall structure of the first liquid cooling plate 21.

In some embodiments, referring to fig. 1, 4 and 5, a heat conducting member 5 is disposed between the first liquid cooling structure 2 and the battery cutting unit 1, and the heat conducting member 5 is in heat exchanging contact with both the outer wall of the first liquid cooling structure 2 and the side wall of the battery cutting unit 1.

That is, heat exchange contact is achieved between the first liquid cooling structure 2 and the battery cutting unit 1 through the heat conducting member 5, specifically, heat exchange contact is achieved between the side wall of the battery cutting unit 1 and the cavity wall of the runner cavity through the heat conducting member 5, so that working heat on the housing 11 of the battery cutting unit 1 is transferred to the heat conducting member 5, and the working heat is transferred to the first liquid cooling structure 2 through the heat conducting member 5, thereby performing heat dissipation and cooling on the battery cutting unit 1.

By arranging the heat conducting member 5, heat conduction between the battery cutting unit 1 and the first liquid cooling structure 2 is improved, so that heat transfer efficiency of the first liquid cooling structure 2 to the battery cutting unit 1 is improved, and heat dissipation efficiency to the battery cutting unit 1 is further improved.

In particular, when the battery cutting unit 1 is implemented, the side of the heat conducting member 5 facing the battery cutting unit 1 is matched with the shape of the corresponding side wall of the battery cutting unit 1, so that the heat conducting member and the side wall are tightly attached to each other, and the heat transfer efficiency is further improved.

The heat conducting member 5 may be, for example, a heat conducting silicone coated on a side wall of the battery cutting unit 1, and the heat conducting member 5 may be, for example, a heat conducting pad or the like provided between the first liquid cooling structure 2 and the battery cutting unit 1.

In some embodiments, referring to fig. 4 and 5, the battery pack further includes a battery cell module 7 disposed in the case and a second liquid cooling structure 6 in heat exchange contact with the battery cell module 7, the second liquid cooling structure 6 includes a second liquid cooling plate 61 in heat exchange contact with the battery cell module 7, and a second water inlet pipe 62 and a second water outlet pipe 63 respectively communicating with an inner cavity of the second liquid cooling plate 61, a water inlet of the first liquid cooling structure 2 communicates with the second water inlet pipe 62, and a water outlet of the first liquid cooling structure 2 communicates with the second water outlet pipe 63.

The second liquid cooling structure 6 is in heat exchange contact with the large surface of the cell module 7, and the second liquid cooling structure 6 is used for exchanging heat to the cell module 7.

In particular, when the water inlet of the first liquid cooling structure 2 is communicated with the second water inlet pipe 62, the water outlet of the first liquid cooling structure 2 is communicated with the second water outlet pipe 63, and parallel connection between the first liquid cooling structure 2 (i.e. the battery cutting-off unit liquid cooling structure) and the second liquid cooling structure 6 (i.e. the battery module liquid cooling structure) is realized, that is, a parallel circuit is formed between the first liquid cooling structure 2 and the second liquid cooling structure 6, so that the influence on the flow resistance of cooling liquid is small, the cooling efficiency is improved, and the first liquid cooling structure 2 and the second liquid cooling structure 6 can share a pipeline, thereby saving the space and the cost.

Specifically, one end of the first water inlet pipe 22 is communicated with a water inlet on the first liquid cooling structure 2, and the other end of the first water inlet pipe 22 is communicated with an outlet of the second water inlet pipe 62; one end of the first water outlet pipe 23 is communicated with a water outlet on the first liquid cooling structure 2, and the other end of the first water outlet pipe 23 is communicated with an inlet of the second water outlet pipe 63.

Example two

The present embodiment also provides a vehicle including a battery pack.

The specific structure and implementation principle of the battery pack in this embodiment are the same as those of the battery pack provided in the foregoing embodiment, and the same or similar technical effects can be brought, which are not described in detail herein, and specific reference may be made to the description of the foregoing embodiment.

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

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

Claims

1. The battery pack is characterized by comprising a box body and a battery cutting unit arranged in the box body;

at least one side of the battery cutting unit is provided with a first liquid cooling structure, and the first liquid cooling structure is in heat exchange contact with the side wall of the battery cutting unit so as to radiate heat of the battery cutting unit;

the first liquid cooling structure comprises a first liquid cooling plate, a first water inlet pipe and a first water outlet pipe;

2. The battery pack of claim 1, wherein the first liquid cooling plate comprises a first sub-plate and a second sub-plate arranged opposite to each other;

3. The battery pack according to claim 2, wherein the second sub-board is provided with at least one buffer groove recessed toward the first sub-board, the buffer groove extends in a direction from the outlet of the first water inlet pipe to the inlet of the first water outlet pipe, and one end of the buffer groove, which faces the first sub-board, is in sealing connection with the first sub-board so as to divide the flow channel cavity into at least two sub-cavities which are mutually communicated.

4. The battery pack according to claim 2, wherein the first sub-board is integrally formed with a side wall of the battery cutoff unit facing the first sub-board.

5. The battery pack according to claim 2, wherein the shape of the first sub-board matches the shape of the side wall of the battery cutoff unit facing the first sub-board.

6. The battery pack according to claim 2, wherein the first liquid cooling plate is provided with a water inlet nozzle and a water outlet nozzle which are communicated with the flow channel cavity;

7. The battery pack according to any one of claims 1 to 6, wherein a heat conductive member is provided between the first liquid cooling structure and the battery shut-off unit, and the heat conductive member is in heat exchanging contact with both an outer wall of the first liquid cooling structure and a side wall of the battery shut-off unit.

8. The battery pack of any one of claims 1 to 6, further comprising a cell module disposed within the housing and a second liquid cooled structure in heat exchange contact with the cell module;

9. A vehicle comprising the battery pack according to any one of claims 1 to 8.