CN220138436U

CN220138436U - Current collector, cooling device and battery pack

Info

Publication number: CN220138436U
Application number: CN202321546764.1U
Authority: CN
Inventors: 秦波; 赵宇航; 王圆圆; 闫仕伟; 刘华俊
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2023-12-05
Anticipated expiration: 2033-06-16

Abstract

The utility model belongs to the technical field of battery thermal management, and discloses a current collector, a cooling device and a battery pack, wherein the current collector comprises a body part, and the body part is provided with a containing cavity; the side wall of the body part is provided with a first connecting hole, the first connecting hole is used for being inserted into the heat exchange flat tube, the first connecting hole is communicated with the accommodating cavity, the opening size of the first connecting hole is larger than the opening size of the accommodating cavity, so that a first step part is formed between the inner wall of the first connecting hole and the inner wall of the accommodating cavity, and the first step part can limit the heat exchange flat tube. The current collector can reduce the pressure loss at the joint of the current collector and the heat exchange flat tube, and meanwhile, the welding effect at the joint can be optimized, and the tightness is ensured.

Description

Current collector, cooling device and battery pack

Technical Field

The utility model relates to the technical field of battery thermal management, in particular to a current collector, a cooling device and a battery pack.

Background

Currently, in the field of batteries, large cylindrical batteries and large cylindrical battery systems have become one direction of development of power batteries with high charge/discharge rates, high grouping efficiency, high safety and higher economy.

The cooling scheme for the large cylinder is mainly a coiled pipe scheme, wherein the coiled pipe is arranged at the side edge of a single row of large cylinder batteries, and cooling liquid flows in the coiled pipe to dissipate heat of the large cylinder batteries. The current serpentine pipe is formed by welding an extruded serpentine flat pipe and a current collector, the serpentine flat pipe stretches into the current collector and is welded with the current collector, the height difference of wall thickness exists at the joint of the serpentine flat pipe and the current collector, the change of flow channel size occurs when cooling liquid flows through the joint due to the existence of the height difference, the pressure loss of the cooling liquid is caused, and in order to compensate the pressure loss, the pressure, the volume and the cost of a circulating pump are increased, so that the space utilization rate in a battery system is reduced; meanwhile, the welding at the joint is likely to cause slag to flow into the collector body, affecting the flow of the flow channel and the cooling liquid in the collector body.

Therefore, there is a need to design a current collector, a cooling device and a battery pack to solve the above technical problems.

Disclosure of Invention

The utility model aims to provide a current collector, which can reduce the pressure loss at the joint of the current collector and a heat exchange flat tube, optimize the welding effect at the joint and ensure the tightness.

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

the current collector comprises a body part, wherein the body part is provided with a containing cavity; the side wall of the body part is provided with a first connecting hole, the first connecting hole is used for being inserted into the heat exchange flat tube, the first connecting hole is communicated with the accommodating cavity, the opening size of the first connecting hole is larger than that of the accommodating cavity, a first step part is formed between the inner wall of the first connecting hole and the inner wall of the accommodating cavity, and the first step part can limit the heat exchange flat tube.

Optionally, the width of the first step part is the same as the wall thickness of the heat exchange flat tube.

Optionally, the width of the first step part is larger than the wall thickness of the heat exchange flat tube.

Optionally, a groove is further formed on a side wall of the body portion, the first connecting hole is formed at a bottom of the groove, and the groove is used for placing solder.

Optionally, a second connecting hole is further formed on a side wall of the body portion, and the second connecting hole is communicated with the accommodating cavity.

The utility model further aims to provide a cooling device which can reduce the pressure loss at the joint of the current collector and the heat exchange flat tube, optimize the welding effect at the joint, ensure the tightness and improve the cooling effect and the space utilization rate of the cooling device.

the cooling device comprises a heat exchange flat tube and two current collectors, wherein a flow passage is arranged in the heat exchange flat tube, and the two current collectors are respectively communicated with two openings of the flow passage.

Optionally, the heat exchange flat tube has a serpentine structure.

Optionally, the cooling device further includes an inlet pipe and an outlet pipe, where the inlet pipe and the outlet pipe are respectively disposed on the two current collectors and are communicated with the accommodating cavities of the corresponding current collectors.

Optionally, the collector and the heat exchange flat tube, the inlet tube and the collector, and the outlet tube and the collector are all connected by welding.

Another object of the present utility model is to provide a battery pack, which includes a plurality of battery packs and a plurality of cooling devices, wherein the battery packs include a plurality of batteries, and the cooling devices are disposed on at least one side of the battery packs, and can cool the batteries, so that a cooling effect is good.

The utility model has the beneficial effects that:

the utility model provides a current collector, a cooling device and a battery pack, wherein when the current collector is connected with a heat exchange flat tube, the heat exchange flat tube is arranged in a first connecting hole and can be abutted with a first step part, so that the installation and the positioning of the heat exchange flat tube are facilitated, at the moment, the height difference between the first connecting hole and a containing cavity, namely the width of the first step part neutralizes the wall thickness of the heat exchange flat tube, so that the height difference between the containing cavity and the heat exchange flat tube is reduced, even no height difference exists, and the pressure loss at the joint of the current collector and the heat exchange flat tube is reduced; and when this collector and heat exchange flat pipe weld, the welding wire can flow into between first connecting hole and the heat exchange flat pipe after melting, has strengthened the welding effect and the leakproofness of heat exchange flat pipe and collector, avoids the welding wire to melt simultaneously and flows into the phenomenon emergence that holds the intracavity, has improved the cleanliness factor of this collector, has guaranteed the circulation of the runner between this collector and the heat exchange flat pipe.

Drawings

FIG. 1 is an isometric view of a cooling device provided in an embodiment of the present utility model;

FIG. 2 is a front view of a cooling device provided in an embodiment of the present utility model;

fig. 3 is a cross-sectional view of a current collector provided in an embodiment of the present utility model;

fig. 4 is a cross-sectional view of a heat collector and a heat exchange flat tube according to an embodiment of the present utility model after being installed.

In the figure:

100. a current collector; 110. a body portion; 120. a receiving chamber; 130. a first connection hole; 140. a first step portion; 150. a groove;

200. a heat exchange flat tube; 210. a flow passage;

300. an inlet pipe; 400. an outlet tube.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. 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 structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the 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.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The current collector 100, the cooling device, and the battery pack of the present utility model will be described with reference to fig. 1 to 4.

As shown in fig. 1 and 2, the present embodiment discloses a cooling device, which includes a heat exchange flat tube 200 and two current collectors 100, wherein a flow channel 210 is disposed in the heat exchange flat tube 200, and the two current collectors 100 are respectively communicated with two openings of the flow channel 210. Through the current collector 100 of this embodiment, the pressure loss of the junction of the current collector 100 and the heat exchange flat tube 200 can be reduced, and meanwhile, the welding effect of the junction can be optimized, and the tightness is ensured.

It will be appreciated that the cooling device may be applied to prismatic, cylindrical and pouch cells, without specific limitation. In this embodiment, the cooling device is applied to the cylindrical battery.

In this embodiment, the heat exchange flat tube 200 has a serpentine structure, and is more attached to the cylindrical battery, so that the space occupation is greatly reduced, and the space utilization rate of the cooling device is improved.

Further, the cooling device further comprises an inlet pipe 300 and an outlet pipe 400, wherein the inlet pipe 300 and the outlet pipe 400 are respectively arranged on the two current collectors 100 and are communicated with the accommodating cavities 120 of the corresponding current collectors 100, so that the cooling device forms a complete cooling circuit, namely, cooling liquid flows into the flow channel 210 from the inlet pipe 300 and flows out from the outlet pipe 400, and the circulating flow of the cooling liquid is realized.

Alternatively, the above-mentioned collector 100 and the flat heat exchange tube 200, the inlet tube 300 and the collector 100, and the outlet tube 400 and the collector 100 are all connected by welding, so that the tightness of the connection between the collector 100 and the flat heat exchange tube 200, the inlet tube 300 and the collector 100, and the outlet tube 400 and the collector 100 can be ensured.

The embodiment also discloses a battery pack, and it includes a plurality of group battery and the cooling device of any one of a plurality of above-mentioned scheme, and the group battery includes a plurality of batteries, and cooling device sets up in at least one side of group battery, can realize cooling down better to the battery, and has improved space utilization and cooling effect.

In order to reduce the pressure loss at the joint of the current collector 100 and the heat exchange flat tube 200, the utility model discloses the current collector 100, wherein the current collector 100 is used for being communicated with the heat exchange flat tube 200, so that the pressure loss at the joint of the current collector 100 and the heat exchange flat tube 200 can be reduced, the welding effect at the joint can be optimized, and the tightness can be ensured.

As shown in fig. 3 and 4, specifically, the current collector 100 includes a body 110, and the body 110 is provided with a receiving cavity 120; the side wall of the body 110 is provided with a first connecting hole 130, the first connecting hole 130 is used for plugging the heat exchange flat tube 200, the first connecting hole 130 is communicated with the accommodating cavity 120, the opening size of the first connecting hole 130 is larger than the opening size of the accommodating cavity 120, so that a first step part 140 is formed between the inner wall of the first connecting hole 130 and the inner wall of the accommodating cavity 120, and the first step part 140 can limit the heat exchange flat tube 200.

Through the above structure, when the collector 100 is connected with the heat exchange flat tube 200, the heat exchange flat tube 200 is arranged in the first connecting hole 130 and can be abutted against the first step part 140, so that the heat exchange flat tube 200 is convenient to install and position, at this time, the height difference between the first connecting hole 130 and the accommodating cavity 120, namely the width of the first step part 140 neutralizes the wall thickness of the heat exchange flat tube 200, so that the height difference between the accommodating cavity 120 and the heat exchange flat tube 200 is reduced, even no height difference exists, and the pressure loss at the joint of the collector 100 and the heat exchange flat tube 200 is reduced; in addition, when the current collector 100 and the heat exchange flat tube 200 are welded, welding wires can flow between the first connecting hole 130 and the heat exchange flat tube 200 after being melted, so that the welding effect and the sealing performance of the heat exchange flat tube 200 and the current collector 100 are enhanced, the phenomenon that the welding wires flow into the accommodating cavity 120 after being melted is avoided, the cleanliness of the current collector 100 is improved, and the flow passage 210 between the current collector 100 and the heat exchange flat tube 200 is ensured.

In an alternative embodiment, the width of the first step portion 140 (the width of the first step portion 140 is the shortest distance between the inner wall surface on any side of the first connecting hole 130 and the inner wall surface on the same side of the accommodating cavity 120) is the same as the wall thickness of the flat heat exchange tube 200, so that the size of the flow channel 210 in the flat heat exchange tube 200 is the same as the size of the accommodating cavity 120, and no height difference exists at the joint between the current collector 100 and the flat heat exchange tube 200, thereby further reducing the pressure loss and saving energy. In another alternative embodiment, the width of the first step portion 140 is greater than the wall thickness of the flat heat exchange tube 200, so that a certain tolerance value can be given on one hand, and the flat heat exchange tube 200 can be installed in the current collector 100, and on the other hand, a gap exists between the flat heat exchange tube 200 and the wall of the first connecting hole 130, and when welding, welding wires melt and flow into the gap, so that the connection strength between the flat heat exchange tube 200 and the current collector 100 is improved.

Optionally, the longitudinal section of the first connecting hole 130 is in a trapezoid structure, that is, the opening size of the side, close to the accommodating cavity 120, of the first connecting hole 130 is the same as the outer peripheral size of the heat exchange flat tube 200, and the opening size of the side, far away from the accommodating cavity 120, of the first connecting hole 130 is larger than the outer peripheral size of the heat exchange flat tube 200, so that a certain welding wire melting and fixing space is provided, the welding wire cannot enter the accommodating cavity 120 after being melted, and the welding effect is improved.

Further, the side wall of the body 110 is further provided with a groove 150, the first connecting hole 130 is formed in the bottom of the groove 150, the groove 150 is used for placing welding wires, so that the welding wires cannot deviate, the welding wires are installed and positioned, and in the welding process, the welding wires are melted, so that the heat exchange flat tube 200 and the current collector 100 can be better fixedly connected, and good sealing performance is ensured.

Still further, a second connection hole is further formed on the sidewall of the body 110, and the second connection hole is communicated with the receiving chamber 120, and is used for connecting the inlet pipe 300 or the outlet pipe 400, so as to ensure inflow and outflow of the cooling liquid in the receiving chamber 120 of the current collector 100.

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. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. 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. The current collector is characterized by comprising a body part (110), wherein the body part (110) is provided with a containing cavity (120); offer first connecting hole (130) on the lateral wall of body portion (110), first connecting hole (130) are used for pegging graft heat transfer flat tube (200), first connecting hole (130) communicate in hold chamber (120), the opening size of first connecting hole (130) is greater than hold chamber (120) opening size, so that the inner wall of first connecting hole (130) with hold and form first ladder portion (140) between the inner wall of chamber (120), first ladder portion (140) can be right heat transfer flat tube (200) are spacing.

2. The current collector according to claim 1, wherein the width of the first step (140) is the same as the wall thickness of the heat exchanging flat tube (200).

3. The current collector of claim 1, wherein the width of the first step (140) is greater than the wall thickness of the heat exchange flat tube (200).

4. A current collector according to any of claims 1-3, wherein the side wall of the body portion (110) is further provided with a groove (150), the first connecting hole (130) is formed at the bottom of the groove (150), and the groove (150) is used for placing solder.

5. A current collector according to any of claims 1-3, wherein a second connecting hole is further provided in a side wall of the body portion (110), said second connecting hole being in communication with the receiving cavity (120).

6. A cooling device, characterized by comprising a heat exchange flat tube (200) and two current collectors (100) according to any one of claims 1-5, wherein a flow channel (210) is arranged in the heat exchange flat tube (200), and the two current collectors (100) are respectively communicated with two openings of the flow channel (210).

7. The cooling device according to claim 6, characterized in that the heat exchange flat tube (200) has a serpentine structure.

8. The cooling device according to claim 7, further comprising an inlet pipe (300) and an outlet pipe (400), said inlet pipe (300) and said outlet pipe (400) being respectively arranged on two of said current collectors (100) and communicating with said containing cavities (120) of the corresponding current collectors (100).

9. The cooling device according to claim 8, characterized in that between the collector (100) and the heat exchange flat tube (200), between the inlet tube (300) and the collector (100) and between the outlet tube (400) and the collector (100) are connected by welding.

10. A battery pack comprising a plurality of battery packs and a plurality of cooling devices according to any one of claims 6-9, wherein the battery packs comprise a plurality of batteries, and wherein the cooling devices are arranged on at least one side of the battery packs.