Battery module with high temperature consistency, battery and equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery module with high temperature consistency, a battery and equipment, which comprise a battery cell group and a liquid cooling bottom plate, the liquid cooling bottom plate is arranged below the battery cell group and is connected to the battery cell group, a cooling channel for a cooling medium to flow is arranged in the liquid cooling bottom plate, discontinuous fins which are arranged at intervals are arranged in the cooling channel, the liquid cooling bottom plate is provided with a first end and a second end which are opposite to each other, and a liquid injection port of the cooling channel is positioned in the middle of the first end; therefore, the liquid injection port is formed in the middle of the first end of the liquid cooling bottom plate, so that a cooling medium flows in from the middle, with large heat accumulation, of the battery cell group, the middle of the battery cell group is subjected to optimal heat dissipation, the temperature difference between the middle and the periphery of the battery cell group is reduced, and the effects of improving the temperature consistency of the battery cell group and preventing the temperature difference from influencing the battery performance are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module, a battery and a device with high temperature consistency. Background Art

[0002] Lithium-ion batteries have the advantages of high energy density, low self-discharge rate, long life and no memory effect, and are widely used in electric vehicles and other fields. However, lithium batteries are very sensitive to temperature. When the temperature is too high, the performance of lithium batteries will be reduced, and even thermal runaway will occur. Low temperature will shorten the driving range of lithium batteries and shorten the life of lithium batteries. In addition, the large temperature difference of lithium batteries will also have an adverse effect on the stability of lithium batteries.

[0003] In order to prevent the performance of lithium batteries from being adversely affected by temperature, liquid cooling solutions are currently mostly used to provide lithium batteries with more efficient, more stable, and lighter heat dissipation, so as to help improve the overall performance and safety of lithium battery systems. For example, a new energy battery liquid cooling plate is disclosed in the publication number CN212257623U. The liquid cooling plate in the disclosed technical solution sets the inlet and outlet of the cooling medium at both ends of the liquid cooling plate. This design is highly flexible and can make the coolant flow evenly throughout the liquid cooling plate, thereby improving the heat transfer efficiency. However, with this inlet and outlet design, the stage where the cooling medium temperature is the lowest and the heat dissipation effect is the best is in the low-temperature area around the lithium battery. When the cooling medium reaches the middle high-temperature part, the temperature rises and the heat dissipation effect has decreased, causing heat accumulation in the middle high-temperature part of the lithium battery, resulting in inconsistent lithium battery temperatures and affecting the performance of the lithium battery.

[0004] It should be noted that the information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to a person skilled in the art. Utility Model Content

[0005] In order to solve the problem that the battery temperature difference affects the battery performance, the utility model provides a battery module with high temperature consistency. The battery module includes a battery cell group and a liquid cooling base plate.

[0006] The liquid cooling base plate is arranged below the battery cell group and connected to the battery cell group. A cooling channel for the flow of cooling medium is provided in the liquid cooling base plate. Discontinuous fins arranged at intervals from each other are provided in the cooling channel. The liquid cooling base plate has a first end and a second end opposite to each other. The liquid injection port of the cooling channel is located in the middle of the first end.

[0007] Furthermore, the battery module with high temperature consistency also includes a liquid injection part and a liquid outlet part, the liquid injection part is arranged in the middle of the first end, the liquid injection port is located on the liquid injection part, the liquid outlet part is arranged on the second end, a liquid outlet is provided on the liquid outlet part, and the cooling channel is respectively connected to the liquid injection port and the liquid outlet.

[0008] Furthermore, the cooling channel includes a first cooling channel and a second cooling channel, and the first cooling channel and the second cooling channel are both provided with discontinuous fins arranged at intervals from each other.

[0009] Furthermore, the first cooling channel and the second cooling channel are S-shaped.

[0010] Furthermore, the first cooling channel and the second cooling channel are arranged symmetrically to each other.

[0011] Furthermore, the arrangement direction of the fins is the same as the arrangement direction of the first cooling channel and the second cooling channel.

[0012] Furthermore, the battery module with high temperature consistency also includes a cover plate, which is located between the liquid-cooling base plate and the battery cell group, and the cover plate is respectively connected to the liquid-cooling base plate and the battery cell group.

[0013] Furthermore, a heat-conducting medium is provided on a side of the cover plate facing the battery cell group.

[0014] The utility model also provides a battery, comprising at least one battery module with high temperature consistency as described in any one of the above items.

[0015] The utility model also provides a device, comprising the battery described above.

[0016] Based on the above, the utility model provides a battery module, battery and equipment with high temperature consistency. Compared with the prior art, a liquid injection port is set in the middle of the first end of the liquid cooling base plate, so that the cooling medium flows into the middle of the battery cell group where the heat accumulation is large, so that the middle of the battery cell group can obtain the best heat dissipation and reduce the temperature difference between the middle and the surrounding of the battery cell group. In this way, the temperature consistency of the battery cell group is improved and the temperature difference is prevented from affecting the battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. The positional relationship described in the drawings in the following description is based on the direction of the bottom plate in the figure unless otherwise specified.

[0018] Figure 1 A schematic diagram of the structure of a battery module with high temperature consistency provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of the exploded structure of a liquid cooling base plate provided in one embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of a cooling channel provided in one embodiment of the utility model;

[0021] Figure 4 for Figure 2 A local enlarged view of point N in the middle.

[0022] Reference numerals:

[0023] 10-battery cell group 20-liquid cooling base plate 30-cooling channel

[0024] 40-fin 50-liquid injection part 60-liquid injection port

[0025] 70-liquid outlet 80-liquid outlet 90-cover plate

[0026] 21-first end 22-second end 31-first cooling channel

[0027] 32- Second cooling channel 41- Bevel cut DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "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 utility model and simplifying the description, rather than indicating or implying 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 utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof all mean "at least including".

[0030] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of the structure of a battery module with high temperature consistency provided by an embodiment of the utility model; Figure 2 A schematic diagram of the exploded structure of a liquid cooling base plate provided in one embodiment of the utility model.

[0031] In order to solve the technical problem that the battery temperature difference affects the battery performance, or to achieve at least one of the above advantages or other advantages, an embodiment of the utility model provides a battery module with high temperature consistency. As shown in the figure, the battery module includes a battery cell group 10 and a liquid cooling base plate 20;

[0032] The liquid cooling base plate 20 is disposed below the battery cell group 10 and connected to the battery cell group 10. In a specific implementation, the liquid cooling base plate 10 is attached to the bottom of the battery cell group 10. A cooling channel 30 for the cooling medium to flow is provided in the liquid cooling base plate 20. When the cooling medium flows in the cooling channel 30, heat is dissipated for the battery cell group 10 through heat transfer.

[0033] Specifically, if Figure 3 As shown, the cooling channel 30 includes a first cooling channel 31 and a second cooling channel 32. The first cooling channel 31 and the second cooling channel 32 are both provided with fins 40 arranged at intervals from each other. The fins 40 divide the first cooling channel 31 and the second cooling channel 32 into a plurality of sub-channels. Preferably, the first cooling channel 31 and the second cooling channel 32 are both S-shaped.

[0034] In some preferred embodiments, the first cooling channel 31 and the second cooling channel 32 are arranged symmetrically to each other.

[0035] like Figure 4As shown, the fin 40 is provided with a plurality of oblique cuts 41, and the plurality of oblique cuts 41 divide the fin 40 into a plurality of discontinuous sections. When the cooling medium flows through the oblique cuts 41, the cooling medium generates flow dispersion and mixes with the cooling medium in other sub-channels to balance the temperature of the cooling medium, thereby achieving uniform cooling of the entire surface of the battery cell group 10, avoiding the problem of local overheating or insufficient cooling. At the same time, the contact area between the cooling medium and the fin 30 is increased, further improving the heat transfer effect.

[0036] Preferably, the fin 40 is arranged in the same direction as the first cooling channel 31 and the second cooling channel 32 , that is, the first cooling channel 31 and the second cooling channel 32 are linear, S-shaped, etc., and the fin 40 also adopts a corresponding linear or S-shaped shape.

[0037] On the basis of the above, the liquid cooling base plate 20 has a first end 21 and a second end 22 opposite to each other. In a specific implementation, a liquid injection portion 50 is provided in the middle of the first end 21. A liquid injection port 60 is provided on the liquid injection portion 50. The cooling medium can flow into the first cooling channel 31 and the second cooling channel 32 from the liquid injection port 60. When the cooling medium flows in from the liquid injection port 60, the temperature is the lowest and the heat dissipation effect is the best. It preferentially flows through the middle of the liquid cooling base plate 20, takes away the heat accumulated in the middle of the battery cell group 10, reduces the temperature difference between the middle and the surrounding of the battery cell group 10, improves the temperature consistency of the battery cell group 10, and avoids the temperature difference affecting the battery performance.

[0038] It should be noted that, since the liquid cooling base plate 20 is plate-shaped, the “middle portion” described in this embodiment refers to the middle portion of the first end 21 of the liquid cooling base plate 20 , rather than the geometric center of the liquid cooling base plate 20 .

[0039] The second end 22 is provided with a liquid outlet 70. The liquid outlet 70 is provided with a liquid outlet port 80. The cooling medium can flow out of the cooling base plate 20 through the liquid outlet port 80. It is understandable that the present case does not limit the location of the liquid outlet 70, and it is only necessary to ensure that the distribution path and area of ​​the first cooling channel 31 and the second cooling channel 32 can fully dissipate heat for the battery cell group 10, and can be set according to actual needs.

[0040] In some preferred embodiments, the battery module with high temperature consistency further includes a cover plate 90. The cover plate 90 is disposed between the liquid cooling base plate 20 and the battery cell group 10. In specific implementation, the cover plate 90 is sealed and covered with the liquid cooling base plate 20 on one side facing the liquid cooling base plate 20, so that a closed cooling channel 30 is formed inside the liquid cooling base plate 20, and the cooling medium can only flow from the liquid injection port 60 and the liquid outlet 80 to avoid leakage of the cooling medium. The sealing method is not limited to bolts, sealing gaskets, sealants, etc.

[0041] On the basis of the above, a heat conducting medium, such as heat conducting gel, heat conducting paste, etc., is provided on the side of the cover plate 90 facing the battery cell group 10 to improve the heat conduction efficiency between the battery cell group 10 and the liquid cooling base plate 20 and improve the heat dissipation effect.

[0042] In some preferred embodiments, the present invention further provides a battery comprising at least one battery module with high temperature consistency as described above.

[0043] In some preferred embodiments, the present invention further provides a device comprising the battery described above.

[0044] In summary, the utility model provides a battery module, battery and equipment with high temperature consistency. Compared with the prior art, a liquid injection port is set in the middle of the first end of the liquid cooling base plate, so that the cooling medium flows into the middle of the battery cell group where the heat accumulation is large, so that the middle of the battery cell group can obtain the best heat dissipation and reduce the temperature difference between the middle and the surrounding of the battery cell group. In this way, the temperature consistency of the battery cell group is improved and the temperature difference is prevented from affecting the battery performance.

[0045] Although this article uses more terms such as battery pack, liquid cooling base plate, fins, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

[0046] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the utility model can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A battery module with high temperature consistency, characterized in that: include: Battery cell group; A liquid-cooled base plate, the liquid-cooled base plate is arranged below the battery cell group and connected to the battery cell group, the liquid-cooled base plate is provided with a cooling channel for the flow of cooling medium, the cooling channel is provided with discontinuous fins arranged at intervals from each other, the liquid-cooled base plate has a first end and a second end opposite to each other, and the liquid injection port of the cooling channel is located in the middle of the first end.

2. The battery module with high temperature consistency according to claim 1, characterized in that: The battery module with high temperature consistency also includes a liquid injection part and a liquid outlet part, the liquid injection part is arranged in the middle of the first end, the liquid injection port is located on the liquid injection part, the liquid outlet part is arranged on the second end, a liquid outlet is provided on the liquid outlet part, and the cooling channel is respectively connected to the liquid injection port and the liquid outlet.

3. The battery module with high temperature consistency according to claim 1, characterized in that: The cooling channel comprises a first cooling channel and a second cooling channel, wherein the first cooling channel and the second cooling channel are both provided with discontinuous fins arranged at intervals from each other.

4. The battery module with high temperature consistency according to claim 3, characterized in that: The first cooling channel and the second cooling channel are S-shaped.

5. The battery module with high temperature consistency according to claim 3, characterized in that: The first cooling channel and the second cooling channel are arranged symmetrically to each other.

6. The battery module with high temperature consistency according to any one of claims 3 to 5, characterized in that: The arrangement direction of the fins is the same as the arrangement direction of the first cooling channel and the second cooling channel.

7. The battery module with high temperature consistency according to claim 1, characterized in that: The battery module with high temperature consistency also includes a cover plate, which is located between the liquid cooling base plate and the battery cell group, and the cover plate is respectively connected to the liquid cooling base plate and the battery cell group.

8. The battery module with high temperature consistency according to claim 7, characterized in that: A heat-conducting medium is disposed on a side of the cover plate facing the battery cell group.

9. A battery, characterized in that: A battery module comprising at least one battery module with high temperature consistency as claimed in any one of claims 1 to 8.

10. A device, characterized in that: Comprising the battery as claimed in claim 9.

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