Liquid cooling plate and battery pack

Abstract

The utility model discloses a liquid cooling plate and a battery pack. The liquid cooling plate comprises a harmonica-shaped tube and a current collector, the harmonica-shaped tube is attached to the cooling main face of a to-be-cooled part, a plurality of liquid cooling channels are arranged in the harmonica-shaped tube side by side, each liquid cooling channel is provided with a plurality of concave parts and convex parts which are arranged in a staggered mode, and the distance between the adjacent concave parts and convex parts in the same liquid cooling channel is set to be an interval. Wherein the distance on one liquid cooling channel is different from the distance on at least another liquid cooling channel, and the distance is gradually reduced along the direction from the low-temperature area to the high-temperature area of the cooling main surface, so that the cooling effect of the liquid cooling channel close to the area with higher temperature of the cooling main surface is stronger, the temperature equalization effect of the liquid cooling plate can be realized, and the service life of the liquid cooling plate is prolonged. And the service life of the single battery cell is prolonged. Current collectors are arranged at the two ends of the harmonica-shaped tube respectively, each current collector is provided with a current collecting cavity, the current collecting cavities are communicated with the liquid cooling channels, and cooling media can circularly flow between the liquid cooling channels and the current collecting cavities. By using the liquid cooling plate in the battery pack, the safety and reliability of the battery pack are enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery cooling, and in particular relates to a liquid cooling plate and a battery pack. Background Art

[0002] Currently, the most widely used new energy vehicles on the market are electric vehicles, which are powered by power batteries. Since the power batteries themselves generate heat during the charging and discharging process, liquid cooling plates are often used to cool the batteries.

[0003] An existing liquid cooling plate consists of a harmonica tube with multiple liquid cooling channels and two current collectors located at the ends of the harmonica tube. The liquid cooling plate fits the main surface of the battery cell, which can effectively improve the heat dissipation effect of the battery cell. However, in actual use, the heating power of the battery cell at different positions is different. The heat generation on the side close to the pole on the main surface is larger, and the heating power of the battery cell gradually decreases in the direction away from the pole. The existing liquid cooling plate cannot solve the problem of temperature difference caused by different heating power, which leads to excessive temperature difference between the upper and lower parts of the battery cell, affecting the life of the battery cell.

[0004] Based on the above, there is an urgent need for a liquid cooling plate and a battery pack to solve the technical problems existing in the prior art. Utility Model Content

[0005] One purpose of the utility model is to provide a liquid cooling plate, which can reduce the temperature difference between different positions of a single battery cell, enhance the temperature equalization effect, and extend the service life of the battery cell.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A liquid cooling plate comprises a harmonica tube and a current collector, wherein the harmonica tube is arranged in contact with the cooling main surface of the component to be cooled, a plurality of liquid cooling channels are arranged in parallel in the harmonica tube, the liquid cooling channel has a plurality of staggered recesses and protrusions, the distance between adjacent recesses and protrusions in the same liquid cooling channel is set as a spacing, the spacing on one liquid cooling channel is different from the spacing on at least another liquid cooling channel, and the spacing gradually decreases along the direction from the low temperature zone to the high temperature zone of the cooling main surface, a current collector is respectively arranged at both ends of the harmonica tube, the current collector has a collecting cavity, the collecting cavity is connected to the liquid cooling channel, and the cooling medium can circulate between the liquid cooling channel and the collecting cavity.

[0008] Optionally, the cross-sectional area of ​​the liquid cooling channel is larger in the direction of the area with higher temperature close to the cooling main surface.

[0009] Optionally, in a direction closer to a region of the cooling main surface where the temperature is higher, the distance between adjacent liquid cooling channels is smaller.

[0010] Optionally, along the direction from the bottom of the component to be cooled to the top of the component to be cooled, the cross-sectional area of ​​the liquid cooling channel gradually increases, the spacing between the concave portion and the convex portion gradually decreases, and the distance between adjacent liquid cooling channels gradually decreases.

[0011] Optionally, the cross-sectional shape of the liquid cooling channel is wavy or broken line.

[0012] Optionally, the cross-sectional shape of the liquid cooling channel is wavy.

[0013] Optionally, a partition plate is provided in the manifold to divide the manifold into a plurality of unit cavities, and the unit cavity is connected to at least one corresponding liquid cooling channel.

[0014] Optionally, along the direction of the area with higher temperature close to the cooling main surface, the number of the liquid cooling channels corresponding to the communication with the unit cavities gradually increases.

[0015] Another object of the present invention is to provide a battery pack that can enhance the temperature equalization effect and extend the service life.

[0016] To achieve this purpose, the utility model adopts the following technical solutions:

[0017] The battery pack comprises a plurality of columns of single cells and a plurality of the above-mentioned liquid cooling plates, and each column of the single cells is fitted with at least one of the above-mentioned liquid cooling plates.

[0018] Optionally, the battery pack further includes a connecting tube, and the current collectors at the same end of the plurality of liquid cooling plates are connected via the connecting tube.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model provides a liquid cooling plate, including a harmonica tube and a current collector. A plurality of liquid cooling channels are arranged in parallel in the harmonica tube, the liquid cooling channel has a plurality of staggered recesses and protrusions, the distance between adjacent recesses and protrusions in the same liquid cooling channel is set as a spacing, the spacing on one liquid cooling channel is different from the spacing on at least another liquid cooling channel, and the spacing gradually decreases along the direction from the low temperature zone to the high temperature zone of the cooling main surface, so that the cooling effect of the liquid cooling channel in the area with higher temperature close to the cooling main surface is stronger, thereby achieving the temperature uniformity effect of the liquid cooling plate, reducing the temperature difference of the single battery cell, and extending the service life of the single battery cell.

[0021] The utility model also provides a battery pack, comprising a single battery cell and the above-mentioned liquid cooling plate, wherein the liquid cooling plate is attached to the cooling main surface of the single battery cell, and since the distance between the concave portion and the convex portion gradually shortens along the direction from the low temperature zone to the high temperature zone of the cooling main surface, so that the fluctuation period of the liquid cooling channel gradually becomes smaller, the contact area between the liquid cooling channel and the cooling main surface can be further increased, so that the cooling effect close to the liquid cooling channel is stronger, thereby achieving the temperature equalization effect of the liquid cooling plate, reducing the temperature difference of the single battery cell, extending the service life of the single battery cell, and effectively enhancing the safety and reliability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the battery pack provided by the embodiment of the utility model;

[0023] Figure 2 It is a schematic diagram of the structure of the liquid cooling plate provided in the embodiment of the utility model;

[0024] Figure 3 is a cross-sectional view of a liquid cooling plate provided in an embodiment of the utility model;

[0025] Figure 4 It is a schematic diagram of the internal structure of the current collector provided in an embodiment of the utility model.

[0026] In the figure:

[0027] 100, single cell; 110, pole; 200, connecting tube;

[0028] 1. Liquid cooling plate; 11. Harmonica tube; 111. Liquid cooling channel; 1111. Concave portion; 1112. Protrusion; 12. Current collector; 121. Current collecting cavity; 1211. Unit cavity; 122. Partition plate; 123. Liquid inlet; 124. Liquid outlet. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0032] The technical solution provided by the utility model is introduced below in conjunction with the accompanying drawings and specific embodiments.

[0033] refer to Figure 1 As shown, this embodiment provides a liquid cooling plate 1, which is arranged on the cooling main surface of the single battery cell 100 to cool down the single battery cell 100. Figure 2 , Figure 3 As shown, the liquid cooling plate 1 includes a harmonica tube 11 and a current collector 12, wherein the harmonica tube 11 is arranged in contact with the cooling main surface of the single battery cell 100, and a plurality of liquid cooling channels 111 are arranged in parallel in the harmonica tube 11, and water or other cooling medium flows in the liquid cooling channels 111; a current collector 12 is respectively arranged at both ends of the harmonica tube 11, and the current collector 12 has a current collecting cavity 121, and the current collecting cavity 121 is connected to the plurality of liquid cooling channels 111, and the cooling medium is branched from one of the current collectors 12 to form a plurality of fluids and enter the plurality of liquid cooling channels 111, absorbs the heat generated during the charging and discharging operation of the single battery cell 100, and then is collected in another current collector 12 and discharged to the outside, thereby realizing the process of cooling the single battery cell 100.

[0034] Specifically, refer to Figure 3 As shown, the liquid cooling channel 111 has a plurality of staggered recesses 1111 and convex portions 1112. For example, the cross-sectional shape of the liquid cooling channel 111 can be a broken line shape or a wave shape, and the utility model is not limited to this. Compared with the liquid cooling channel 111 with a straight cross-sectional shape, the liquid cooling channel 111 provided in this embodiment can effectively increase the contact area between the liquid cooling channel 111 and the wall of the harmonica tube 11, thereby enhancing the heat absorption effect of the cooling medium on the single battery cell 100, making the cooling degree of the single battery cell 100 more obvious.

[0035] Preferably, continue to refer to Figure 3 As shown, in this embodiment, the cross-sectional shape of the liquid cooling channel 111 is wavy. Compared with the liquid cooling channel 111 with a zigzag cross-sectional shape, the liquid cooling channel 111 with a wavy cross-sectional shape can reduce the friction resistance of the cooling medium in the liquid cooling channel 111, making the cooling medium flow more smoothly, reducing energy loss and the generation of noise and vibration.

[0036] A pole 110 (including a positive pole and a negative pole) is arranged at the top of the single cell 100, so that during the charging and discharging process, the heat generation power of the single cell 100 gradually decreases from the top of the single cell 100 to the bottom of the single cell 100. Therefore, the temperature of the cooling main surface gradually decreases along the direction from the top of the single cell 100 to the bottom of the single cell 100, that is, a low temperature zone is formed at the bottom of the cooling main surface, and a high temperature zone is formed at the top of the cooling main surface. In order to improve the temperature equalization effect of the single battery cell 100, in the present embodiment, the distance between adjacent recesses 1111 and protrusions 1112 in the same liquid cooling channel 111 is set as the spacing, and the spacing between the recesses 1111 and the protrusions 1112 in a single liquid cooling channel 111 is gradually shortened in the direction from the top of the single battery cell 100 to the bottom of the single battery cell 100, so that the fluctuation period of the liquid cooling channel 111 gradually becomes smaller, so that the contact area between the liquid cooling channel 111 and the cooling main surface can be further increased, so that the cooling effect of the liquid cooling channel 111 close to the pole 110 is stronger, thereby achieving the temperature equalization effect of the liquid cooling plate 1, reducing the temperature difference of the single battery cell 100, and extending the service life of the single battery cell 100.

[0037] Exemplarily, in the present embodiment, the harmonica tube 11 has three liquid cooling channels 111 arranged in parallel, and the cross-sectional shapes of the three liquid cooling channels 111 are all wavy. In the vertical direction, the distance between the concave portion 1111 and the convex portion 1112 in the liquid cooling channel 111 close to the pole 110 is the largest, and the distance between the concave portion 1111 and the convex portion 1112 in the liquid cooling channel 111 away from the pole 110 is the smallest. In addition, the cross-sectional sizes of the three liquid cooling channels 111 decrease from top to bottom, thereby increasing the flow rate of the cooling medium entering the uppermost liquid cooling channel 111. Those skilled in the art can select a liquid cooling plate 1 with liquid cooling channels 111 of different cross-sectional sizes according to the actual heating power of a single battery cell 100, thereby further enhancing the temperature uniformity effect of the liquid cooling plate 1.

[0038] Optionally, in other embodiments, along the vertical direction, the closer to the pole 110 of the single battery cell 100, the smaller the distance between the recess 1111 and the protrusion 1112, so that the arrangement of the liquid cooling channel 111 is more compact. By changing the arrangement density of the liquid cooling channel 111, the cooling performance of different positions of the liquid cooling plate 1 can be adjusted, thereby further enhancing the temperature uniformity effect of the liquid cooling plate 1.

[0039] In order to ensure the temperature uniformity performance of the liquid cooling plate 1, in other embodiments, the cross-sectional area of ​​the liquid cooling channel 111 gradually increases along the direction from the bottom of the single battery cell 100 to the top of the single battery cell 100, and the spacing between the concave portion 1111 and the convex portion 1112 in a single liquid cooling channel 111 gradually decreases, and the distance between two adjacent liquid cooling channels 111 also gradually decreases, so that the temperature uniformity performance of the liquid cooling plate 1 is maximized, thereby ensuring the temperature uniformity requirement of the liquid cooling plate 1 under actual conditions.

[0040] Specifically, refer to Figure 4 As shown, in this embodiment, a partition plate 122 is provided in the collecting cavity 121, and the partition plate 122 can divide the collecting cavity 121 into a plurality of unit cavities 1211, and the unit cavity 1211 corresponds to at least one liquid cooling channel 111. After the cooling medium enters the collecting cavity 121 from one of the collecting fluids 12, it can be diverted to form multiple streams of fluid. In this way, before entering the liquid cooling channel 111, the impact force and flow resistance between the cooling medium and the liquid cooling channel 111 can be reduced, so that the cooling medium can enter the liquid cooling channel 111 more smoothly, thereby helping to improve the flow rate and cooling efficiency of the cooling medium.

[0041] It is understandable that in other embodiments, in the vertical direction, along the direction of the pole 110 close to the single battery cell 100, the number of liquid cooling channels 111 connected to the corresponding unit cavities 1211 gradually increases. For example, when six liquid cooling channels 111 are provided in the harmonica tube 11, the unit cavity 1211 located at the bottom is connected to one liquid cooling channel 111, the unit cavity 1211 located in the middle is connected to two liquid cooling channels 111, and the unit cavity 1211 located at the top is connected to three liquid cooling channels 111. As the number of unit cavities 1211 connected to the liquid cooling channels 111 gradually increases, the flow rate of the cooling medium flowing through different positions on the liquid cooling plate 1 will also gradually increase, so that the closer the position on the liquid cooling plate 1 is to the pole 110, the stronger the cooling effect, which helps to balance the cooling performance of the entire liquid cooling plate 1, so that the temperature uniformity effect of the liquid cooling plate 1 is further guaranteed.

[0042] This embodiment also provides a battery pack, referring to Figure 1As shown, the battery pack includes multiple columns of single cells 100 and multiple liquid cooling plates 1, and at least one side of each column of single cells 100 is fitted with a liquid cooling plate 1. In the battery pack, since the distance between the concave portion 1111 and the convex portion 1112 in the liquid cooling plate 1 is gradually shortened along the direction from the top of the single cell 100 to the bottom of the single cell 100, the fluctuation period of the liquid cooling channel 111 gradually becomes smaller, so that the contact area between the liquid cooling channel 111 and the cooling main surface can be further increased, so that the cooling effect of the liquid cooling channel 111 close to the pole 110 is stronger, so that the temperature equalization effect of the liquid cooling plate 1 can be achieved, the temperature difference of the single cell 100 is reduced, and the service life of the single cell 100 is extended, which effectively enhances the safety and reliability of the battery pack.

[0043] Furthermore, in the present embodiment, the battery pack includes four single cells 100 and three liquid cooling plates 1, and two single cells 100 are arranged at intervals along the length direction of the liquid cooling plate 1 and along the length direction horizontally perpendicular to the liquid cooling plate 1, and three liquid cooling plates 1 are arranged at intervals along the length direction horizontally perpendicular to the liquid cooling plate 1, so that two opposite sides of each column of single cells are respectively fitted with a liquid cooling plate 1. Through the above arrangement, the temperature balance of each single cell 100 can be ensured, and the rate at which the single cell 100 recovers to the normal working temperature is further improved.

[0044] It should be noted that, along the length extension direction of the liquid cooling plate 1, the number of single battery cells 100 can be set to be multiple, and the length of a single liquid cooling plate 1 can be adjusted according to the number of single battery cells 100 in each column to ensure the cooling effect on the single battery cells 100, thereby expanding the cooling capacity of the liquid cooling plate 1.

[0045] Specifically, the liquid cooling plate 1 provided in this embodiment also includes a cooling system, and the cooling system includes a compressor, and the output end and the input end of the compressor are respectively connected to a current collector 12. Referring to the prior art, it can be known that after the cooling medium flows out of the liquid cooling plate 1, it can enter the cooling system to achieve cooling, thereby re-forming a low-temperature cooling medium, and under the action of the compressor, it flows into the liquid cooling plate 1 again. In addition, the compressor also has the function of controlling the flow rate of the cooling medium, so that the cooling efficiency of the liquid cooling plate 1 can be effectively adjusted to ensure that the cooling of the single battery cell 100 is achieved on the basis of energy saving and consumption reduction.

[0046] Specifically, in this embodiment, a single current collector 12 is provided with a plurality of liquid inlets 123 and liquid outlets 124, and one liquid inlet 123 and one liquid outlet 124 are connected to one unit cavity 1211. Among them, the three liquid inlets 123 on one of the liquid cooling plates 1 at the edge are connected to the outlet of the cooling system, the three liquid outlets 124 on another liquid cooling plate 1 at the edge are connected to the inlet of the cooling system, and the liquid outlets 124 and liquid inlets 123 on the liquid cooling plate 1 in the middle are respectively connected to the two liquid cooling plates 1 at the edge through connecting pipes 200 (such as corrugated pipes, rubber hoses), so that the three liquid cooling plates 1 are connected in parallel.

[0047] In the above configuration, the cooling medium cooled by the cooling system can be transported in sequence through the compressor to one of the liquid cooling plates 1 located at the edge, the liquid cooling plate 1 located in the middle, and another liquid cooling plate 1 located at the edge, thereby ensuring that each liquid cooling plate 1 can obtain an appropriate amount of cooling medium, ensuring that each battery cell can be cooled, and avoiding the problem of local overheating.

[0048] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Liquid cooling plate, characterized in that: The invention comprises a harmonica tube (11) and a current collector (12), wherein the harmonica tube (11) is arranged in contact with the cooling main surface of the component to be cooled, and a plurality of liquid cooling channels (111) are arranged in parallel in the harmonica tube (11), wherein the liquid cooling channel (111) has a plurality of staggered recesses (1111) and protrusions (1112), and the distance between adjacent recesses (1111) and protrusions (1112) in the same liquid cooling channel (111) is set as a spacing, wherein one of the liquid cooling channels (111) The spacing on the liquid cooling channel (111) is different in size from the spacing on at least another liquid cooling channel (111), and the spacing gradually decreases along the direction from the low temperature zone to the high temperature zone of the cooling main surface. A collector (12) is provided at each end of the harmonica tube (11). The collector (12) has a collecting cavity (121). The collecting cavity (121) is connected to the liquid cooling channel (111), and a cooling medium can circulate between the liquid cooling channel (111) and the collecting cavity (121).

2. The liquid cooling plate according to claim 1, characterized in that: The cross-sectional area of ​​the liquid cooling channel (111) increases in the direction of a region with a higher temperature close to the cooling main surface.

3. The liquid cooling plate according to claim 2, characterized in that: In the direction of a region with a higher temperature close to the cooling main surface, the distance between adjacent liquid cooling channels (111) is smaller.

4. The liquid cooling plate according to claim 3, characterized in that: Along the direction from the bottom of the part to be cooled to the top of the part to be cooled, the cross-sectional area of ​​the liquid cooling channel (111) gradually increases, the spacing between the concave portion (1111) and the convex portion (1112) gradually decreases, and the distance between adjacent liquid cooling channels (111) gradually decreases.

5. The liquid cooling plate according to any one of claims 1 to 4, characterized in that: The cross-sectional shape of the liquid cooling channel (111) is wavy or folded.

6. The liquid cooling plate according to claim 5, characterized in that: The cross-sectional shape of the liquid cooling channel (111) is wavy.

7. The liquid cooling plate according to claim 1, characterized in that: A partition plate (122) is provided in the manifold (121) so as to separate the manifold (121) into a plurality of unit cavities (1211), wherein the unit cavities (1211) are connected to at least one corresponding liquid cooling channel (111).

8. The liquid cooling plate according to claim 7, characterized in that: Along the direction of the area with higher temperature close to the cooling main surface, the number of the liquid cooling channels (111) corresponding to the communication of the unit cavities (1211) gradually increases.

9. A battery pack, characterized in that: It comprises a plurality of columns of single battery cells (100) and a plurality of liquid cooling plates (1) according to any one of claims 1 to 8, and each column of the single battery cells (100) is provided with at least one of the liquid cooling plates (1).

10. The battery pack according to claim 9, characterized in that: The battery pack further comprises a connecting tube (200), and the current collectors (12) at the same end of a plurality of the liquid cooling plates (1) are connected via the connecting tube (200).

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