Low temperature difference battery cell module and battery

Abstract

The utility model relates to battery technology field especially low temperature difference electric core module and battery module, it includes electric core group and first liquid cooling board, first liquid cooling board is located the bottom of electric core group and is connected in electric core group, is equipped with a plurality of cooling flow channel for cooling medium flow in first liquid cooling board, both ends of cooling flow channel are formed and pour liquid mouth and liquid outlet through first liquid cooling board, cooling flow channel is equipped with at least two discontinuous fins, two rows of fins are arranged mutually and are spaced, the height H of cooling flow channel is greater than the height h of fin, through setting up two rows of interval distribution's fin in cooling flow channel, make the gap between fin and cooling flow channel top wall simultaneously, make cooling medium form flow velocity difference when flowing through fin, this flow velocity distribution help to adjust the flow state of cooling medium in whole cooling flow channel, make the flow of cooling medium in each area more uniform, thereby reduce the possibility of bias flow, avoid the problem of large temperature difference caused by bias flow phenomenon.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a low temperature differential cell module and battery. Background Technology

[0002] Lithium-ion batteries have advantages such as high energy density, low self-discharge rate, long lifespan, and no memory effect, and are widely used in electric vehicles and other fields; however, lithium batteries are very sensitive to temperature. Excessively high battery temperatures can reduce battery performance and even lead to thermal runaway, while excessively low battery temperatures can shorten driving range and battery life. Furthermore, large temperature differences can also adversely affect battery stability.

[0003] To prevent battery performance from being affected by temperature, liquid cooling solutions are commonly used to provide efficient, stable, and lightweight heat dissipation, which helps improve the performance and safety of the battery system. Currently, to improve the heat dissipation efficiency of liquid cooling, fins or fins are typically incorporated into the cooling channels to increase the heat exchange area of ​​the liquid cooling plate and enhance secondary flow of the coolant. However, while these solutions can improve heat dissipation efficiency to some extent, the fin or fin design also increases the flow resistance of the coolant and causes flow deviation, resulting in a large temperature difference on the surface of the liquid cooling plate, which adversely affects the stability of the lithium battery.

[0004] It should be noted that the information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0005] To address the technical problem of large temperature differences on the surface of the liquid cooling plate caused by conventional heat dissipation solutions, this invention provides a low temperature differential battery cell module, which includes a battery cell assembly and a first liquid cooling plate.

[0006] The first liquid cooling plate is located at the bottom of the battery cell assembly and connected to the battery cell assembly. The first liquid cooling plate is provided with a plurality of cooling channels for the flow of cooling medium. The two ends of the cooling channels pass through the first liquid cooling plate to form a liquid injection port and a liquid outlet. The cooling channels are provided with at least two rows of discontinuous fins. The two rows of fins are arranged at intervals. The height H of the cooling channels is greater than the height h of the fins.

[0007] Furthermore, the ratio of the height h of the fin to the height H of the cooling channel is 1:1.3 to 1:4.

[0008] Furthermore, both ends of the fins are provided with beveled angles.

[0009] Furthermore, the angle β of the beveled angle at both ends of the fin is 20° to 60°.

[0010] Furthermore, the length of the fin The spacing between the two rows of fins The ratio is 1:1 to 1:2.6.

[0011] Furthermore, the width of the fins Spacing between different fins in the same column The ratio is 1:4 to 1:10.

[0012] Furthermore, the first liquid cooling plate includes a base plate and a top cover, the cooling channel is disposed on the base plate, the top cover is connected to the base plate, and the side of the top cover away from the base plate is connected to the cell assembly.

[0013] Furthermore, the low temperature differential battery module also includes a second liquid cooling plate, which is connected to the battery module.

[0014] Furthermore, there are two second liquid cooling plates, which are respectively connected to both sides of the battery cell assembly.

[0015] Furthermore, this utility model also provides a battery comprising a low temperature differential cell module as described in any of the above claims.

[0016] Based on the above, the low temperature differential cell module and battery provided by this utility model, compared with the prior art, by setting two rows of spaced fins in the cooling channel, and forming a gap between the fins and the top wall of the cooling channel, the cooling medium forms a velocity difference when flowing through the fins. This velocity distribution helps to adjust the flow state of the cooling medium in the entire cooling channel, making the flow of the cooling medium in each area more uniform, thereby reducing the possibility of flow deviation and avoiding the problem of large temperature difference caused by flow deviation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships shown in the drawings in the following description are based on the direction in which the components are drawn in the figures.

[0018] Figure 1This is an exploded structural diagram of a low-temperature differential battery module provided in an embodiment of the present invention;

[0019] Figure 2 This is an exploded structural diagram of the first liquid cooling plate provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the cooling channel structure provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point N;

[0022] Figure 5 for Figure 3 A schematic diagram of the cross-sectional structure at point AA.

[0023] Reference numerals: 10-cell assembly, 20-first liquid cooling plate, 30-cooling channel, 40-fin, 21-bottom plate, 22-top cover, 31-injection port, 32-outlet port Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0026] Please see Figure 1 and Figure 2 , Figure 1 This is an exploded structural diagram of a low-temperature differential battery module provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the first liquid cooling plate provided in an embodiment of the present invention.

[0027] To address the technical problem of large temperature differences on the surface of the liquid cooling plate caused by conventional heat dissipation solutions, or to achieve at least one or more of the aforementioned advantages, an embodiment of this utility model provides a low temperature differential battery module. As shown in the figure, the low temperature differential battery module includes a battery cell assembly 10 and a first liquid cooling plate 20.

[0028] The first liquid cooling plate 20 is located at the bottom of the battery cell assembly 10 and is connected to the battery cell assembly 10 to dissipate heat. The first liquid cooling plate 20 has several cooling channels 30 for the flow of cooling medium, and the two ends of each cooling channel 30 penetrate the first liquid cooling plate 20 to form an injection port 31 and an outlet 32. The cooling medium can be injected into the cooling channels 30 through the injection port 31, dissipating heat for the battery cell assembly 10 through heat exchange, and then flowing out of the cooling channels 30 through the outlet 32.

[0029] In a specific implementation, the first liquid cooling plate 20 includes a base plate 21 and a top cover 22. Cooling channels 30 are disposed on the base plate 21. The top cover 22 is connected to the base plate 21. The side of the top cover 22 away from the base plate 21 is connected to the battery cell assembly 10. When the cooling medium is injected into the cooling channels 30 from the injection port 31, it dissipates heat from the battery cell assembly 10 through heat exchange.

[0030] Please combine Figure 2 See Figure 3 Based on the above, the cooling channel 30 is provided with at least two rows of discontinuous fins 40. Specifically, the two rows of fins 40 are arranged alternately in the cooling channel 30. The fins 40 can increase the contact area between the first liquid cooling plate 20 and the cooling medium, thereby improving heat dissipation efficiency. At the same time, the fins 40 can interrupt the development of the boundary layer of the cooling medium, reduce inertial loss, and achieve a smaller fluid pressure loss, so as to reduce the thermal boundary, reduce flow resistance, and improve heat dissipation efficiency.

[0031] In some preferred embodiments, the length of the fin 40 The spacing between the two rows of fins 40 The ratio is 1:1 to 1:2.6. This facilitates uniform fluid flow of the cooling medium as it flows through the fins 40, reduces the generation of eddies and dead zones, improves flow stability, and promotes effective distribution of the cooling medium between the fins 40, avoiding local overheating or uneven cooling.

[0032] In some preferred embodiments, the width of the fins Spacing between different fins 40 in the same column The ratio is 1:4 to 1:10. This ensures that the cooling medium can fully exchange heat with the fins 40 as it flows through them, thereby improving heat exchange efficiency. The spacing between different fins 40 in the same row... If the spacing is too small, it will increase the flow resistance between the fins 40, restricting the flow of the cooling medium between the fins 40 and ultimately reducing the heat exchange efficiency. When the spacing between different fins 40 in the same row is too small... When the temperature is too high, the contact time between the cooling medium and the fin 40 will be shorter, resulting in insufficient heat exchange and reduced heat exchange efficiency.

[0033] In some preferred embodiments, both ends of the fin 40 are provided with beveled angles. The beveled angle design can further enhance the turbulence of the cooling medium fluid, break the boundary layer in the cooling medium flow, and improve the convective heat transfer coefficient. Preferably, the angle β of the beveled angle at both ends of the fin 40 is 20° to 60°.

[0034] If the angle β of the oblique cut is greater than 60°, the cooling medium will generate local backflow and eddies when flowing through the fins 40°, which will increase the flow resistance of the cooling medium, leading to a decrease in the heat transfer coefficient. This will result in local heat retention, reducing local heat transfer efficiency and creating a temperature difference that will have a negative impact on the overall battery.

[0035] If the angle β of the oblique cut is less than 20°, it is not conducive to the formation of flow splitting, and it is impossible to effectively balance the temperature of the cooling medium. In addition, the thermal boundary layer of the cooling medium is thick, resulting in low heat transfer efficiency.

[0036] In some preferred embodiments, such as Figure 5 As shown, the height H of the cooling channel 30 is greater than the height h of the fins 40. This means there is a gap between the fins 40 and the top cover 22 to promote uniform flow of the cooling medium. When the cooling medium flows through the fins 40, the fins 40 can change the flow cross-sectional area of ​​the cooling medium, thus affecting the flow velocity. Specifically, the cooling medium flows faster around the periphery of the fins 40 and slower around the gap, creating a velocity difference. This velocity distribution helps adjust the flow state of the cooling medium throughout the entire cooling channel 30, making the flow of the cooling medium more uniform in all areas, thereby reducing the possibility of flow deviation and avoiding large temperature differences caused by flow deviation.

[0037] In some preferred embodiments, the ratio of the fin height h to the cooling channel height H is 1:1.3 to 1:4, so as to achieve a better balance between pressure drop and heat transfer performance, avoid the adverse effect of excessive pressure drop on heat dissipation efficiency, and at the same time, the heat transfer effect can be enhanced by the turbulence effect of the fins 40.

[0038] In some preferred embodiments, the low temperature differential battery module may further include a second liquid cooling plate (not shown). The second liquid cooling plate is connected to the battery cell assembly 10. In specific implementations, the structure of the second liquid cooling plate is completely identical to the structure of the first liquid cooling plate 20. There can be two second liquid cooling plates, which are respectively disposed on both sides of the battery cell assembly to improve the heat dissipation uniformity on both sides of the battery cell assembly 10.

[0039] In some preferred embodiments, the present invention also provides a battery comprising a low temperature differential cell module as described above.

[0040] In summary, the low-temperature differential cell module and battery provided by this utility model, compared with the prior art, by setting two rows of spaced fins in the cooling channel and forming a gap between the fins and the top wall of the cooling channel, a velocity difference is formed when the cooling medium flows through the fins. This velocity distribution helps to adjust the flow state of the cooling medium in the entire cooling channel, making the flow of the cooling medium in each area more uniform, thereby reducing the possibility of flow deviation and avoiding the problem of large temperature difference caused by flow deviation.

[0041] Although this document frequently uses terms such as fins, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

[0042] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of this utility model can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A low-temperature differential battery module, characterized in that: include Battery cell assembly; The first liquid cooling plate is located at the bottom of the battery cell assembly and connected to the battery cell assembly. The first liquid cooling plate is provided with a plurality of cooling channels for the flow of cooling medium. The two ends of the cooling channels pass through the first liquid cooling plate to form a liquid injection port and a liquid outlet. The cooling channels are provided with at least two rows of discontinuous fins, and the two rows of fins are arranged at intervals. Wherein, the height H of the cooling channel is greater than the height h of the fin.

2. The low temperature differential battery module according to claim 1, characterized in that: The ratio of the height h of the fin to the height H of the cooling channel is 1:1.3 to 1:

4.

3. The low temperature differential battery module according to claim 1, characterized in that: Both ends of the fins are provided with beveled angles.

4. The low temperature differential battery module according to claim 3, characterized in that: The angle β of the oblique cut at both ends of the fin is 20° to 60°.

5. The low temperature differential battery module according to claim 1, characterized in that: The length of the fin The spacing between the two rows of fins The ratio is 1:1 to 1:2.

6.

6. The low temperature differential battery module according to claim 1, characterized in that: The width of the fins Spacing between different fins in the same column The ratio is 1:4 to 1:

10.

7. The low temperature differential battery module according to claim 1, characterized in that: The first liquid cooling plate includes a base plate and a top cover. The cooling channel is disposed on the base plate, the top cover is connected to the base plate, and the side of the top cover away from the base plate is connected to the cell assembly.

8. The low temperature differential battery module according to claim 1, characterized in that: The low temperature differential battery module also includes a second liquid cooling plate, which is connected to the battery module.

9. The low temperature differential battery module according to claim 8, characterized in that: There are two second liquid cooling plates, which are respectively connected to both sides of the battery cell assembly.

10. A battery, characterized in that: It includes the low temperature differential battery module as described in any one of claims 1-9.

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