Temperature regulating plate and battery pack

Abstract

The application provides a temperature adjusting plate and a battery pack. The temperature adjusting plate comprises a body and a turbulence structure. The body is provided with at least one flow channel extending along the length direction thereof. The turbulence structure is arranged in the flow channel and extends along the length direction of the flow channel. In the direction from the inlet to the outlet of the flow channel, the area of the cross section of the turbulence structure in the radial direction of the flow channel has a decreasing trend. The temperature adjusting plate provided by the application can improve the cooling or heating efficiency of the temperature adjusting medium in the flow channel of the body on the battery cell by arranging the turbulence structure in the flow channel of the body and extending the turbulence structure along the length direction of the flow channel. On this basis, the cooling or heating effect of the temperature adjusting medium at each position in the flow channel on the battery cell is basically consistent by making the area of the cross section of the turbulence structure in the radial direction of the flow channel have a decreasing trend in the direction from the inlet to the outlet of the flow channel, which is beneficial to the temperature consistency of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a temperature regulating plate and a battery pack. Background Technology

[0002] In related technologies, in order to improve the cooling or heating efficiency of the battery cells in the battery pack, a temperature regulating plate is usually set between two adjacent rows of battery cells in the battery pack. By circulating a temperature regulating medium in the flow channel of the temperature regulating plate, the temperature regulating medium exchanges heat with the battery cells through the temperature regulating plate to cool or heat the battery cells.

[0003] However, the temperature regulating medium in the flow channel of the temperature regulating plate constantly exchanges heat with the battery cell. The temperature of the temperature regulating medium at different locations in the flow channel will have a large difference, which makes the heat exchange efficiency between the temperature regulating medium and the battery cell different. This leads to a large temperature difference between the battery cells in the battery pack, affecting the overall performance of the battery pack. Utility Model Content

[0004] The embodiments of this application provide a temperature regulating plate and a battery pack, which can improve the technical problem that the temperature of the temperature regulating medium at different positions in the flow channel of the temperature regulating plate is different, resulting in different heat exchange efficiencies between the temperature regulating medium and the battery cells at different positions in the flow channel, and thus causing a large temperature difference between the cells in the battery pack.

[0005] In a first aspect, embodiments of this application provide a temperature regulating plate, comprising:

[0006] The body has at least one flow channel extending along its length.

[0007] A flow disturbance structure is disposed within the flow channel and extends along the length of the flow channel. In the direction from the inlet to the outlet of the flow channel, the cross-sectional area of ​​the flow disturbance structure in the radial direction of the flow channel tends to decrease.

[0008] In one embodiment, the cross-section of the turbulence structure in the radial direction of the flow channel includes two edge lines arranged at an angle, one end of the two edge lines being connected to each other, and the other end of the two edge lines extending to the inner circumferential surface of the flow channel.

[0009] In one embodiment, the included angle formed by the two edge lines in the direction from the inlet to the outlet of the flow channel tends to decrease.

[0010] In one embodiment, the cross-sectional area of ​​the turbulence structure in the radial direction of the flow channel gradually decreases in the direction from the inlet to the outlet of the flow channel.

[0011] In one embodiment, the turbulence structure extends spirally along the extension direction of the flow channel, and the pitch of the turbulence structure tends to decrease in the direction from the inlet to the outlet of the flow channel.

[0012] In one embodiment, the turbulence structure satisfies: P = (1 - L1 / L) * X, where P is the pitch of the turbulence structure at a distance L1 from the inlet of the flow channel, L is the length from the inlet to the outlet of the flow channel, and X is the initial pitch of the turbulence structure at the inlet of the flow channel.

[0013] In one embodiment, the body has a plurality of flow channels arranged along the width direction of the body, and the width of the body is W, wherein 5mm≤X≤W.

[0014] In one embodiment, the inner circumferential surface of the flow channel and / or the surface of the turbulence structure are provided with sharp protrusions, which are used to puncture air bubbles in the flow channel.

[0015] In one embodiment, the height of the sharp protrusion is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

[0016] Secondly, embodiments of this application provide a battery pack, comprising:

[0017] Battery assembly, comprising multiple battery cells;

[0018] A temperature regulating plate, wherein the temperature regulating plate is as described above, the temperature regulating plate is disposed between two adjacent rows of battery cells, and the temperature regulating plate includes:

[0019] The body has at least one flow channel extending along its length.

[0020] A flow disturbance structure is disposed within the flow channel and extends along the length of the flow channel. In the direction from the inlet to the outlet of the flow channel, the cross-sectional area of ​​the flow disturbance structure in the radial direction of the flow channel tends to decrease.

[0021] The beneficial effects of the embodiments of this application are as follows:

[0022] The temperature regulating plate provided in this application embodiment has a turbulence structure set in the flow channel of the body. The turbulence structure extends along the length of the flow channel, which can increase the Reynolds number of the temperature regulation cutoff in the flow channel. This causes the flow of the temperature regulating medium in the flow channel to gradually change into turbulence, so as to mix the temperature regulating medium and accelerate the heat transfer in the boundary layer of the temperature regulating medium. This is beneficial to improving the heat exchange effect between the temperature regulating medium and the body, and thus improving the cooling or heating efficiency of the battery cell by the temperature regulating medium in the flow channel through the body.

[0023] Building upon this, by making the cross-sectional area of ​​the turbulence structure in the radial direction of the flow channel tend to decrease from the inlet to the outlet, the flow area of ​​the flow channel tends to increase from the inlet to the outlet. This also makes the internal surface area and volume per unit length of the flow channel tend to increase from the inlet to the outlet. This not only improves the heat exchange efficiency between the temperature regulating medium and the main body, but also addresses the problem of bubbles occupying space in the flow channel, leading to a reduction in the volume of the temperature regulating medium and thus affecting the cooling efficiency of the temperature regulating medium on the battery cell at the bubble location. This ensures that the cooling or heating effect of the temperature regulating medium on the battery cell is basically consistent at all locations in the flow channel, which is beneficial for the temperature consistency of the battery cell at different locations. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A schematic diagram of the structure of one embodiment of the temperature regulating plate provided in this application;

[0026] Figure 2 A partial structural schematic diagram of one embodiment of the temperature regulating plate provided in this application;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 for Figure 2 A cross-sectional view along the AA direction;

[0029] Figure 5 for Figure 4 Enlarged view of point B in the middle;

[0030] Figure 6 for Figure 2 A partial enlarged view of the cross-sectional view along the BB direction;

[0031] Figure 7 for Figure 2 A cross-sectional view along the CC direction;

[0032] Figure 8 for Figure 7 Enlarged view of point C in the middle.

[0033] Temperature regulating plate 1; body 10; flow channel 11; inlet 111; sharp protrusion 12; turbulence structure 20; cross section 200; edge line 201; turbulence hole 202. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] This application provides a temperature regulating plate and a battery pack. These will be described in detail below.

[0036] Figure 1 This is a schematic diagram of one embodiment of the temperature regulating plate provided in this application. Figure 1 As shown, the temperature regulating plate 1 includes a body 10, which has at least one flow channel 11 extending along its length. The temperature regulating plate 1 can be disposed between two adjacent rows of battery cells in a battery pack, so that the side of the body 10 of the temperature regulating plate 1 is in direct or indirect contact with the outer peripheral surface of the battery cell, enabling rapid heat transfer between the body 10 of the temperature regulating plate 1 and the battery cell. Subsequently, by providing a temperature regulating medium to the flow channel 11 of the body 10 of the temperature regulating plate 1, the temperature regulating medium can exchange heat with the battery cell through the body 10 to cool or heat the battery cell.

[0037] It should be noted that the temperature regulating medium can be water, oil, or other media that can exchange heat with the battery cell through the body 10, and there are no restrictions here.

[0038] In addition, the temperature regulating medium can absorb the heat from the battery cell through the body 10 to cool the battery cell. For example, the temperature of the temperature regulating medium entering the flow channel 11 of the body 10 can be kept low, so that the temperature regulating medium absorbs the heat transferred from the battery cell to the body 10 during the flow of the body 10, thereby cooling the battery cell and the body 10.

[0039] Alternatively, the temperature regulating medium can also transfer heat to the battery cell through the body 10 to heat the battery cell. For example, the temperature of the temperature regulating medium entering the flow channel 11 of the body 10 can be made higher, so that the temperature regulating medium transfers heat to the battery cell through the body 10 during the flow of the flow channel 11 of the body 10, thereby heating the battery cell and the body 10.

[0040] Figure 2 This is a partial structural schematic diagram of one embodiment of the temperature regulating plate provided in this application. Figure 3 for Figure 2 A magnified view of point A in the middle. (See image below.) Figure 2 and Figure 3 As shown, the temperature regulating plate 1 also includes a turbulence structure 20, which is disposed within the flow channel 11 of the body 10 and extends along the length of the flow channel 11. Thus, when the temperature regulating medium flows within the flow channel 11 of the body 10, the turbulence structure 20 can turbulentize the medium, increasing the Reynolds number at which temperature regulation is cut off within the flow channel 11. This gradually transforms the flow of the temperature regulating medium into turbulence, mixing the medium and accelerating heat transfer within the boundary layer of the medium. This improves the heat exchange effect between the temperature regulating medium and the body 10, thereby increasing the cooling or heating efficiency of the battery cell through the body 10.

[0041] Figure 4 for Figure 2 A cross-sectional view along the AA direction. Figure 5 for Figure 4 A magnified view of point B. In some embodiments, such as Figure 4 and Figure 5 As shown, in the direction from the inlet 111 to the outlet of the flow channel 11, the area of ​​the cross section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can tend to decrease.

[0042] It is understandable that as the temperature regulating medium flows in the flow channel 11 from the inlet 111 to the outlet, the temperature difference between the temperature regulating medium farther away from the inlet 111 and the temperature regulating medium at the inlet 111 of the flow channel 11 is greater. Therefore, the temperature regulating medium farther away from the inlet 111 of the flow channel 11 has a weaker cooling or heating effect on the battery cell. This will lead to inconsistent temperatures among the battery cells in the battery pack, affecting the performance of each battery cell in the battery pack.

[0043] In particular, when the temperature regulating medium in the flow channel 11 is used to absorb the heat of the battery cell to cool the battery cell, the temperature regulating medium farther away from the inlet 111 in the flow channel 11 will absorb heat and evaporate to form more bubbles. The bubbles will occupy the space in the flow channel 11, resulting in a reduction in the volume of the temperature regulating medium located at the bubble in the flow channel 11, which affects the cooling efficiency of the temperature regulating medium at the bubble for the battery cell.

[0044] This embodiment of the application makes the cross-sectional area 200 of the turbulence structure 20 in the radial direction of the flow channel 11 tend to decrease in the direction from the inlet 111 to the outlet of the flow channel 11. This makes the flow area of ​​the flow channel 11 tend to increase in the direction from the inlet 111 to the outlet of the flow channel 11. This also makes the inner surface area and volume of the flow channel 11 per unit length tend to increase in the direction from the inlet 111 to the outlet of the flow channel 11. This not only improves the heat exchange efficiency between the temperature regulating medium and the body 10, but also improves the problem that the volume of the temperature regulating medium is reduced due to the bubbles occupying the space of the flow channel 11, which in turn affects the cooling efficiency of the temperature regulating medium on the battery cell at the bubble. This makes the cooling or heating effect of the temperature regulating medium on the battery cell basically consistent at all positions in the flow channel 11, which is beneficial to the temperature consistency of the battery cell at each position.

[0045] The temperature regulating plate 1 provided in this embodiment of the application provides a turbulence structure 20 in the flow channel 11 of the body 10. The turbulence structure 20 extends along the length of the flow channel 11, which can increase the Reynolds number of the temperature regulation cutoff in the flow channel 11. This causes the flow of the temperature regulating medium in the flow channel 11 to gradually change into turbulence, so as to mix the temperature regulating medium and accelerate the heat transfer in the boundary layer of the temperature regulating medium. This is beneficial to improving the heat exchange effect between the temperature regulating medium and the body 10, and thus improving the cooling or heating efficiency of the battery cell by the temperature regulating medium in the flow channel 11 through the body 10.

[0046] In some embodiments, such as Figure 5 and Figure 6 As shown, in the direction from the inlet 111 to the outlet of the flow channel 11, the area of ​​the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can be gradually reduced. As a result, the cooling or heating effect of the temperature regulating medium in the flow channel 11 on the battery cell can be more consistent at various parts in the extension direction of the flow channel 11, thereby further improving the temperature consistency of the battery cells in the battery pack.

[0047] In the direction from the inlet 111 to the outlet of the flow channel 11, the area of ​​the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can be gradually and uniformly reduced, or the area of ​​the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can be gradually and non-uniformly reduced. The specific reduction can be determined according to the actual temperature distribution of each area in the battery pack during normal operation.

[0048] Of course, in the direction from the inlet 111 to the outlet of the flow channel 11, the area of ​​the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can be gradually reduced in a stepwise manner. That is, in the direction from the inlet 111 to the outlet of the flow channel 11, at least a portion of the area of ​​the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 remains unchanged.

[0049] In some embodiments, such as Figure 5 and Figure 6 As shown, the cross-section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 includes two edge lines 201 arranged at an angle. One end of the two edge lines 201 is connected to each other, and the other end of the two edge lines 201 extends to the inner circumferential surface of the flow channel 11. This allows the inner circumferential surface of the flow channel 11 to have a larger area connected to the turbulence structure 20, enabling faster heat transfer between the turbulence structure 20 and the body 10, which is beneficial for improving the cooling or heating efficiency of the temperature regulating medium within the flow channel 11 on the body 10.

[0050] In the direction from the inlet 111 to the outlet of the flow channel 11, the included angle formed by the two edge lines 201 of the cross section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 can tend to decrease, thereby making the cross section 200 of the turbulence structure 20 in the radial direction of the flow channel 11 gradually decrease in the direction from the inlet 111 to the outlet of the flow channel 11.

[0051] Figure 7 for Figure 2 A cross-sectional view along the BB direction. Figure 8 for Figure 7 A magnified view of point C. In some embodiments, such as Figure 7 and Figure 8 As shown, the turbulence-inducing structure 20 can be spirally extended along the extension direction of the flow channel 11. Therefore, the turbulence-inducing structure 20 can have a better turbulence-inducing effect on the temperature-regulating medium within the flow channel 11.

[0052] In the direction from the inlet 111 to the outlet of the flow channel 11, the pitch of the turbulence structure 20 can tend to decrease. Therefore, the turbulence structure 20 farther from the inlet 111 of the flow channel 11 has a better turbulence effect on the temperature regulating medium within the flow channel 11, and the area per unit length of the turbulence structure 20 is larger. This results in higher heat exchange efficiency between the temperature regulating medium and the body 10 and the turbulence structure 20, which is beneficial for improving the uniformity of cooling or heating of each cell within the battery pack.

[0053] It should be noted that the pitch of the turbulence structure 20 can be gradually reduced in the direction from the inlet 111 to the outlet of the flow channel 11, or the pitch of the turbulence structure 20 can be reduced in a stepwise manner in the direction from the inlet 111 to the outlet of the flow channel 11. The specific method can be determined according to the actual temperature distribution of each area in the battery pack during normal operation.

[0054] In some embodiments, the turbulence structure 20 may satisfy: P = (1 - L1 / L) * X, where, as Figure 1 and Figure 8 As shown, P is the pitch of the turbulence structure 20 at a distance L1 from the inlet 111 of the flow channel 11, L is the length from the inlet 111 to the outlet of the flow channel 11, and X is the initial pitch of the turbulence structure 20 at the inlet 111 of the flow channel 11. This allows the cooling effect of the temperature regulating medium within the flow channel 11 on each battery cell to be more consistent, resulting in a more uniform temperature distribution among the battery cells.

[0055] In some embodiments, such as Figure 4 As shown, the body 10 has multiple flow channels 11 arranged along its width. The temperature regulating medium within the multiple flow channels 11 can be identical, or a portion of the flow channels 11 can be connected to another portion, with the temperature regulating medium in one portion of the flow channels 11 being opposite to that in the other portion. The width of the body 10 is W, and the width W of the body 10 and the initial pitch X of the turbulence-inducing structure 20 at the inlet 111 of the flow channel 11 satisfy the following condition: 5mm ≤ X ≤ W. This allows the turbulence-inducing structure 20 to have a better turbulence effect on the temperature regulating medium within the flow channels 11.

[0056] In some embodiments, the radial cross section 200 of the flow channel 11 is fan-shaped, and the inner diameter of the flow channel 11 is D. The inner diameter D of the flow channel 11 and the initial pitch X of the turbulence structure 20 at the inlet 111 of the flow channel 11 can satisfy: 5mm≤X≤D, thereby further improving the turbulence effect of the turbulence structure 20 on the temperature regulating medium in the flow channel 11.

[0057] In some embodiments, such as Figure 3 As shown, sharp protrusions 12 can be provided on the inner circumferential surface of the flow channel 11 and / or the surface of the turbulence structure 20. The sharp protrusions 12 are used to puncture air bubbles in the flow channel 11. Thus, by puncturing air bubbles in the flow channel 11 through the sharp protrusions 12, the temperature regulating medium in the flow channel 11 can fully contact the inner circumferential surface of the flow channel 11 and / or the surface of the turbulence structure 20, thereby improving the heat exchange efficiency between the temperature regulating medium and the body 10 and / or the turbulence structure 20, and thus improving the cooling or heating efficiency of the temperature regulating medium on the battery cell.

[0058] It should be noted that at least one sharp protrusion 12 may be provided on the inner circumferential surface of the flow channel 11. The tip of the sharp protrusion 12 is located at one end of the sharp protrusion 12 away from the inner circumferential surface of the flow channel 11. When multiple sharp protrusions 12 are provided on the inner circumferential surface of the flow channel 11, the multiple sharp protrusions 12 may be arranged at intervals along the inner circumferential surface of the flow channel 11.

[0059] Alternatively, at least one sharp protrusion 12 may be provided on the surface of the turbulence structure 20. The tip of the sharp protrusion 12 is located at the end of the sharp protrusion 12 away from the turbulence structure 20. When multiple sharp protrusions 12 are provided on the surface of the turbulence structure 20, the multiple sharp protrusions 12 may be spaced apart along the extending direction of the turbulence structure 20.

[0060] In some embodiments, the height of the sharp protrusion 12 can be greater than or equal to 0.1 mm and less than or equal to 0.3 mm. This allows the sharp protrusion 12 to effectively puncture air bubbles within the flow channel 11, and avoids the sharp protrusion 12 being too high, which would affect the turbulence effect of the turbulence structure 20 on the temperature regulating medium. The height of the sharp protrusion 12 can be 0.11 mm, 0.13 mm, 0.15 mm, 0.18 mm, 2 mm, 2.2 mm, 2.5 mm, etc., and is not limited here.

[0061] In some embodiments, such as Figure 3 As shown, multiple turbulence holes 202 can be formed in the turbulence structure 20, and these turbulence holes 202 penetrate the turbulence structure 20 to further improve the turbulence effect of the turbulence structure 20 on the temperature regulating medium in the flow channel 11. Specifically, the turbulence structure 20 has multiple turbulence holes 202. The multiple turbulence holes 202 are arranged at intervals along the circumference of the turbulence structure 20. The turbulence holes 202 penetrate the turbulence structure 20 along the extension direction of the flow channel 11.

[0062] This application also provides a battery pack, which includes a temperature regulating plate. The specific structure of the temperature regulating plate is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0063] The battery pack may include battery components and a temperature regulating plate. The battery components include multiple rows of cells. The temperature regulating plate is as described above and is located between two adjacent rows of cells.

[0064] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A temperature regulating plate, characterized in that, include: The body has at least one flow channel extending along its length. A flow disturbance structure is disposed within the flow channel and extends along the length of the flow channel. In the direction from the inlet to the outlet of the flow channel, the cross-sectional area of ​​the flow disturbance structure in the radial direction of the flow channel tends to decrease.

2. The temperature regulating plate as described in claim 1, characterized in that, The turbulence structure has a cross-section in the radial direction of the flow channel comprising two edge lines arranged at an angle, one end of the two edge lines being connected to each other, and the other end of the two edge lines extending to the inner circumferential surface of the flow channel.

3. The temperature regulating plate as described in claim 2, characterized in that, In the direction from the inlet to the outlet of the flow channel, the included angle formed by the two edge lines tends to decrease.

4. The temperature regulating plate as described in claim 1, characterized in that, In the direction from the inlet to the outlet of the flow channel, the cross-sectional area of ​​the turbulence structure in the radial direction of the flow channel gradually decreases.

5. The temperature regulating plate as described in any one of claims 1 to 4, characterized in that, The turbulence structure extends spirally along the extension direction of the flow channel, and the pitch of the turbulence structure tends to decrease in the direction from the inlet to the outlet of the flow channel.

6. The temperature regulating plate as described in claim 5, characterized in that, The turbulence structure satisfies: P = (1 - L1 / L) * X, where P is the pitch of the turbulence structure at a distance L1 from the inlet of the flow channel, L is the length from the inlet to the outlet of the flow channel, and X is the initial pitch of the turbulence structure at the inlet of the flow channel.

7. The temperature regulating plate as described in claim 6, characterized in that, The body has a plurality of flow channels arranged along the width direction of the body, and the width of the body is W, wherein 5mm≤X≤W.

8. The temperature regulating plate as described in any one of claims 1 to 4, characterized in that, The inner circumferential surface of the flow channel and / or the surface of the turbulence structure are provided with sharp protrusions, which are used to puncture air bubbles in the flow channel.

9. The temperature regulating plate as described in claim 8, characterized in that, The height of the sharp protrusion is greater than or equal to 0.1 mm and less than or equal to 0.3 mm.

10. A battery pack, characterized in that, include: Battery assembly, comprising multiple battery cells; A temperature regulating plate, wherein the temperature regulating plate is the temperature regulating plate according to any one of claims 1 to 9, and the temperature regulating plate is disposed between two adjacent rows of battery cells.

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