Liquid cooling system and battery pack

Abstract

The utility model provides a liquid cooling system and a battery pack, the liquid cooling system comprises a plurality of cooling side plates and a plurality of cooling bottom plates, the plurality of cooling side plates and the plurality of cooling bottom plates extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; a gap is formed between every two adjacent cooling side plates, and the two cooling side plates and the at least one cooling bottom plate are encircled to form a containing part; the first pipeline is respectively communicated with the inlet end of each cooling side plate and the inlet end of each cooling bottom plate, and the second pipeline is respectively communicated with the outlet end of each cooling side plate and the outlet end of each cooling bottom plate; according to the battery pack, the cooling side plates and the cooling bottom plate are combined and applied, so that the heat dissipation area of each single battery can be increased, the heat dissipation efficiency of the battery is improved, and the operation safety and the working performance of the battery pack are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a liquid cooling system and a battery pack. BACKGROUND

[0002] The liquid cooling system is an indispensable component of the battery pack, which is used to solve the temperature rise problem caused by the heat accumulation in the battery pack during operation, and to ensure the working efficiency and safety of the battery pack.

[0003] In the related art, due to the limitation of the size of the battery pack and the number of single batteries, the heat exchange area of the liquid cooling system located in the battery pack is difficult to meet the heat dissipation demand of multiple single batteries, so that the effective control of the temperature of the battery pack is not easy to achieve, which affects the operation safety and working performance of the battery pack. CONTENT OF THE INVENTION

[0004] Therefore, the present application aims to provide a liquid cooling system and a battery pack to solve the above-mentioned technical problems.

[0005] To achieve the above purpose, the first aspect of the present application provides a liquid cooling system applied to a battery pack, which comprises:

[0006] A plurality of cooling side plates and a plurality of cooling bottom plates, the plurality of cooling side plates and the plurality of cooling bottom plates extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction;

[0007] There is a gap between two adjacent cooling side plates, and the two cooling side plates and at least one cooling bottom plate form a containing part;

[0008] A first pipe and a second pipe, the first pipe is connected to the inlet end of each cooling side plate and the inlet end of each cooling bottom plate, and the second pipe is connected to the outlet end of each cooling side plate and the outlet end of each cooling bottom plate.

[0009] The second aspect of the present application provides a battery pack, which comprises:

[0010] A box body;

[0011] The liquid cooling system of the first aspect, the first pipe and the second pipe are fixedly connected to the box body; and

[0012] A plurality of single batteries, the plurality of single batteries are arranged in the box body, and the plurality of single batteries are arranged in each containing part in the first direction.

[0013] From the above, it can be seen that the liquid cooling system and the battery pack provided by the application can correspondingly form a plurality of accommodating portions for accommodating single batteries by the plurality of cooling side plates and the plurality of cooling bottom plates, the opposite sides of each single battery in the accommodating portion can be cooled by the cooling side plates, the bottom of each single battery in the accommodating portion can be cooled by the cooling side plates, the single battery has a larger heat dissipation area, the heat dissipation efficiency of the single battery is improved, the temperature inside the battery pack is effectively controlled, and the safety and stability of the performance of the battery pack are ensured. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0015] Figure 1 It is a structural schematic diagram of the liquid cooling system in the present application;

[0016] Figure 2 It is a connection schematic diagram of the cooling side plate and the first pipeline and the second pipeline in the present application respectively;

[0017] Figure 3 It is a sectional view of one of the cooling side plates in the present application;

[0018] Figure 4 It is a connection schematic diagram of the cooling bottom plate and the first pipeline and the second pipeline in the present application respectively;

[0019] Figure 5 It is a structural schematic diagram of one of the cooling bottom plates in the present application;

[0020] Figure 6 It is a sectional view of the medium regulator in the first perspective in the present application;

[0021] Figure 7 It is a sectional view of the medium regulator in the second perspective in the present application;

[0022] Figure 8 It is a structural schematic diagram of the battery pack in the present application;

[0023] Figure 9 It is a structural schematic diagram of the liquid cooling system in the box in the present application;

[0024] Figure 10 It is a local enlarged view of the first pipeline and the second pipeline at the end plate in the present application.

[0025] Explanation of reference signs:

[0026] 1. Cooling side plate; 101. Liquid cooling channel; 102. First guide flow channel;

[0027] 2. Cooling bottom plate; 201. Sub cooling plate; 202. Second guide flow channel;

[0028] 3. Containing part;

[0029] 401. First pipe; 402. Second pipe; 410. Converging pipe; 420. Diverging pipe;

[0030] 5. Control switch;

[0031] 6. Medium dispenser; 610. Medium dispensing part; 611. First cavity; 620. Medium recycling part; 621. Second cavity;

[0032] 7. Heat exchange surface;

[0033] 8. Box;

[0034] 9. Single battery;

[0035] 10. End plate; 1001. Open slot;

[0036] 11. Electrical component. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below with reference to the embodiments and the accompanying drawings.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be understood as the common meanings understood by those with ordinary skills in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0039] The liquid cooling system is an important component of the battery pack, which can effectively manage the heat generated during the operation of the battery pack, so as to maintain the battery pack in a suitable temperature range to prevent the overall temperature rise of the battery pack due to heat accumulation inside the battery pack; therefore, the application of the liquid cooling system not only can improve the working efficiency of the battery pack, but also can enhance the safety and reliability of the operation process, and ensure that the battery pack has good performance under different working conditions.

[0040] In practical application, the cooling efficiency of the liquid cooling system is often limited by the overall size of the battery pack and the number of single batteries constituting it. The applicant found that the heat exchange area of the liquid cooling system currently applied in the battery pack is insufficient to meet the simultaneous heat dissipation of multiple single batteries, resulting in the technical problems of low heat dissipation efficiency and poor heat dissipation performance of the battery pack, so that it is difficult to effectively control the temperature inside the battery pack. In the long run, not only affects the safe operation of the battery pack, but also has a negative impact on its working performance.

[0041] Therefore, the first aspect of the present application provides a liquid cooling system, which comprises a plurality of cooling side plates 1, a plurality of cooling side plates 1, a first pipe 401 and a second pipe 402, which are combined Figures 1-7 The content shown is described in detail for the liquid cooling system.

[0042] A liquid cooling system comprises a plurality of cooling side plates 1 and a plurality of cooling side plates 1, the plurality of cooling side plates 1 and the plurality of cooling bottom plates 2 extend in a first direction and are arranged in parallel in a second direction perpendicular to the first direction; there is a gap between two adjacent cooling side plates 1, and the two cooling side plates 1 and at least one cooling bottom plate 2 form a containing part 3; the liquid cooling system further comprises a first pipe 401 and a second pipe 402, the first pipe 401 is connected to the inlet end of each cooling side plate 1 and the inlet end of each cooling bottom plate 2 respectively, and the second pipe 402 is connected to the outlet end of each cooling side plate 1 and the outlet end of each cooling bottom plate 2 respectively.

[0043] Specifically, Figure 1 The structure of the liquid cooling system in the present application is shown in the figure, Figure 2 The connection of the cooling side plate 1 with the first pipe 401 and the second pipe 402 is shown in the figure, Figure 4 The connection of the cooling bottom plate 2 with the first pipe 401 and the second pipe 402 is shown in the figure.

[0044] For the cooling side plate 1, such as Figure 1 And Figure 2As shown, the liquid cooling system has a plurality of cooling side plates 1 extending in a first direction and arranged in parallel in a second direction, specifically, there is a space between two adjacent cooling side plates 1, which can be used to accommodate a single battery 9 in the battery pack, when a plurality of single batteries 9 are located between two adjacent cooling side plates 1, the two adjacent cooling side plates 1 can limit the installation position of the single battery 9, and improve the neatness of the arrangement of the single battery 9. More specifically, when a plurality of single batteries 9 are arranged in the second direction perpendicular to the first direction, the opposite sides of each single battery 9 can be respectively in contact with two adjacent cooling side plates 1 and form a heat exchange area, so that the cooling side plates 1 cool the single battery 9 through the heat exchange area and control the temperature of the single battery 9.

[0045] In addition to the cooling side plate 1, the liquid cooling system also has a plurality of cooling bottom plates 2, as shown in Figure 1 and Figure 4 ; Specifically, a plurality of cooling bottom plates 2 extend in a first direction and are arranged in parallel in a second direction, that is, the extension direction and arrangement direction of the plurality of cooling bottom plates 2 are the same as those of the plurality of cooling side plates 1, so that the single battery 9 located between two adjacent cooling side plates 1 can be supported by the cooling bottom plate 2. More specifically, each cooling bottom plate 2 can be perpendicular to a cooling side plate 1, and two adjacent cooling side plates 1 and at least one cooling bottom plate 2 form a containing part 3 for cooling the single battery 9, when a plurality of single batteries 9 are arranged in the first direction in the containing part 3, the two adjacent cooling side plates 1 can cool the two opposite sides of each single battery 9 in the containing part 3, and the cooling bottom plate 2 can cool the bottom of each single battery 9 in the containing part 3, so that each single battery 9 is cooled on three sides, and each single battery 9 has sufficient heat dissipation area, which is beneficial to improve the cooling efficiency of the liquid cooling system on the single battery 9, improve the heat dissipation effect of the single battery 9, avoid heat accumulation inside the battery pack, thereby effectively control the temperature of the battery pack, and ensure the operation safety and performance of the battery pack.

[0046] Further, in order to combine Figure 1 , Figure 2 and Figure 4 to illustrate the content, the first direction can be set as the Y direction, and the second direction can be set as the X direction, at this time, the X direction is perpendicular to the Y direction, which will not be described here.

[0047] For the first pipe 401 and the second pipe 402, as shown in Figure 1 and Figure 4As shown, the first pipeline 401 is connected to the inlet end of each cooling side plate 1 and the inlet end of each cooling bottom plate 2, i.e. the cooling medium can be supplied to each cooling side plate 1 and each cooling bottom plate 2 through the first pipeline 401; the second pipeline 402 is connected to the outlet end of each cooling side plate 1 and the outlet end of each cooling bottom plate 2, i.e. the cooling medium discharged from all the cooling side plates 1 and cooling bottom plates 2 can be released to the outside of the liquid cooling system through the second pipeline 402.

[0048] More specifically, when the battery pack in operation is cooled by the liquid cooling system, the cooling medium can be supplied to the inside of each cooling side plate 1 and each cooling bottom plate 2 through the first pipeline 401 by the conveying device, so that the cooling medium fills and flows in all the cooling side plates 1 and all the cooling bottom plates 2; since the unit cells 9 of the battery pack are in contact with the corresponding cooling side plates 1 and cooling bottom plates 2, the heat generated by the unit cells 9 can be transferred to the cooling side plates 1 through the opposite two sides of the unit cells 9, to the cooling bottom plates 2 through the bottom of the unit cells 9, and exchanged with the cooling medium in the cooling side plates 1 and cooling bottom plates 2 respectively, i.e. the heat is transferred to the cooling medium; as the cooling medium flows into the second pipeline 402 from the outlet end of the cooling side plates 1 and the outlet end of the cooling bottom plates 2, the second pipeline 402 can release the cooling medium to the outside of the liquid cooling system, thereby dissipating the heat accumulated in the battery pack.

[0049] For example, the conveying device can be a pump body or other device having a liquid pumping function.

[0050] Further, since the first pipeline 401 and the second pipeline 402 of the liquid cooling system are connected to each cooling side plate 1 and each cooling bottom plate 2 respectively, the integration of the first pipeline 401 and the second pipeline 402 is relatively high, which can reduce the redundancy of the pipeline distribution in the liquid cooling system and help to reduce the space occupied by the liquid cooling system in the battery pack.

[0051] Further, since the first pipeline 401 and the second pipeline 402 of the liquid cooling system are connected to each cooling side plate 1 and each cooling bottom plate 2 respectively, each cooling side plate 1 and each cooling bottom plate 2 has good independence, so that when one of the cooling side plates 1 or one of the cooling bottom plates 2 fails, it will not affect the other cooling side plates 1 or cooling bottom plates 2, which helps to maintain the cooling effect of the liquid cooling system on the battery pack.

[0052] In some embodiments, each cooling side plate 1 is provided with two groups of liquid cooling channels 101 connected to the inlet end and the outlet end of the cooling side plate 1 respectively, each group of liquid cooling channels 101 includes a plurality of first sub-flow passages extending in a first direction; the side of the cooling side plate 1 away from the inlet end is provided with a first guide flow passage 102 connected to the two groups of liquid cooling channels 101 respectively, and the flow directions of the cooling medium in the two groups of liquid cooling channels 101 are opposite.

[0053] Specifically, Figure 3 is a sectional view of one of the cooling side plates 1 in the present application.

[0054] Further, for the cooling side plate 1, as shown in Figure 2 and Figure 3 , two groups of liquid cooling channels 101 can be provided in each cooling side plate 1, which are respectively connected to the inlet end and the outlet end of the cooling side plate 1, to provide a flow path for the cooling medium, so that the cooling medium can be distributed in different areas of the cooling side plate 1 and absorb the heat transferred from the single battery 9 to the cooling side plate 1 during the flow process. More specifically, each group of liquid cooling channels 101 includes a plurality of first sub-flow channels extending in the first direction, i.e., the extension directions of the plurality of first sub-flow channels are the same. When the cooling medium flows in the cooling flow channel, it can be distributed in the plurality of first sub-flow channels, which can expand the uniformity of the distribution of the cooling medium in the cooling side plate 1, so that the cooling side plate 1 forms a larger heat exchange area, thereby improving the side cooling effect of the single battery 9.

[0055] More specifically, the side of the cooling side plate 1 away from the inlet end is provided with a first guide flow channel 102 connected to the two groups of liquid cooling channels 101, which can be used to connect the two groups of cooling flow channels. Since the two groups of cooling flow channels are respectively connected to the inlet end and the outlet end of the cooling side plate 1, and the cooling medium flows in opposite directions in the two groups of liquid cooling channels 101, the cooling medium can flow into the next cooling flow channel through the first guide flow channel 102 after flowing into one of the cooling flow channels, i.e., flowing in the direction indicated by the arrow in Figure 3 and forming a "U" shape; this design can increase the utilization rate of the first sub-flow channel for the internal space of the cooling side plate 1, which is beneficial to enhance the cooling performance of the cooling side plate 1.

[0056] In some embodiments, in the height direction of the cooling side plate 1, the outlet end of the same cooling side plate 1 is located above the inlet end, wherein the height direction of the cooling side plate 1 is perpendicular to the first direction and the second direction, respectively.

[0057] For the inlet end and the outlet end of the cooling side plate 1, as shown in Figure 3 , by setting the outlet end of the cooling side plate 1 above the inlet end of the same cooling side plate, the cooling medium can gradually fill the cooling flow channel in the cooling side plate 1 under the action of gravity after entering the internal cooling flow channel of the cooling side plate 1 through the first pipe 401 and the inlet end of the cooling side plate 1, to ensure that the cooling side plate 1 has good cooling effect, and also improves the utilization rate of the cooling medium.

[0058] Further, in order to combine Figures 1-4The cooling side plate 1 and the cooling bottom plate 2 will be described in detail. The high end of the cooling side plate 1 can be set as the Z direction, and the Z direction is perpendicular to the X direction and the Y direction.

[0059] In some embodiments, the cooling bottom plate 2 comprises two sub-cooling plates 201, each of which is provided with a plurality of second sub-flow channels extending in the first direction; the side of the cooling bottom plate 2 away from the inlet end is provided with a second guide flow channel 202 in communication with the two sub-cooling plates 201, and the flow directions of the cooling medium in the two sub-cooling plates 201 are opposite.

[0060] Specifically, Figure 5 FIG. 2 is a schematic structural diagram of one of the cooling bottom plates 2 in the application.

[0061] Further, for the cooling bottom plate 2, as shown in Figure 4 and Figure 5 , the cooling bottom plate 2 can comprise two sub-cooling plates 201, each of which is provided with a plurality of second sub-flow channels extending in the first direction, i.e., the extension directions of the plurality of second sub-flow channels are the same, and the plurality of second sub-flow channels provide flow channels for the cooling medium and absorb the heat transferred from the single battery 9 to the cooling bottom plate 2 during the flow process. More specifically, the plurality of second sub-flow channels extending in the first direction can also distribute the cooling medium in different areas of the cooling bottom plate 2, expand the uniformity of the distribution of the cooling medium in the cooling bottom plate 2, and form a larger heat exchange area in the cooling bottom plate 2, thereby improving the cooling effect on the bottom of the single battery 9.

[0062] More specifically, the side of the cooling bottom plate 2 away from the inlet end is provided with a second guide flow channel 202 in communication with the two sub-cooling plates 201, which can be used to communicate the plurality of second sub-flow channels in the two sub-cooling plates 201; since the first pipeline 401 is in communication with the inlet end of the cooling bottom plate 2, the second pipeline 402 is in communication with the outlet end of the cooling bottom plate 2, and the flow directions of the cooling medium in the two sub-cooling plates 201 are opposite, the cooling medium flowing into the plurality of second sub-flow channels in one of the sub-cooling plates 201 can flow into the plurality of second sub-flow channels in the next sub-cooling plate 201 through the second guide flow channel 202, i.e., flow in the direction indicated by the arrow in Figure 5 and in a "U" shape; this design can increase the utilization rate of the internal space of the cooling bottom plate 2 by the second sub-flow channels, which is conducive to enhancing the cooling performance of the cooling bottom plate 2.

[0063] In some embodiments, a strip-shaped gap is formed between the two sub-cooling plates 201 of the same cooling bottom plate 2 to release the eruption material of the single battery 9 during the thermal runaway process.

[0064] Further, for the cooling bottom plate 2, as shown in Figure 1 , Figure 4 andFigure 5 As shown, a strip-shaped gap can be formed between two sub-cooling plates 201 of the same cooling plate 2; specifically, since the housing bottom of the single battery 9 can be provided with an explosion-proof valve, when the single battery 9 is located in the accommodating portion 3, the explosion-proof valve of the single battery 9 can correspond to the strip-shaped gap, and if the single battery 9 occurs thermal runaway, the single battery 9 can release the eruption material with high temperature and high pressure in the internal through the explosion-proof valve, so that the release eruption material is released to the environment outside the battery pack through the strip-shaped gap, reducing the threat to the surrounding single battery 9, and being beneficial to improve the safety of the battery pack application.

[0065] It should be noted that the eruption material released by the single battery during thermal runaway includes but is not limited to eruption material electrolyte vapor, decomposition gas (such as hydrogen, etc.), metal particles, and smoke, etc.

[0066] In some embodiments, the plurality of cooling plates 2 are respectively connected with the first pipe 401 and the second pipe 402 through the medium distributor 6, and the medium distributor 6 includes a medium distribution part 610 and a medium recovery part 620; the medium distribution part 610 is provided with a first cavity 611, and the first cavity 611 is respectively connected with the inlet end of the cooling plate 2 and the first pipe 401; the medium recovery part 620 is provided with a second cavity 621, and the second cavity 621 is respectively connected with the outlet end of the cooling plate 2 and the second pipe 402, and the second cavity 621 is not connected with the first cavity 611.

[0067] Specifically, Figure 6 It is a cross-sectional view of the medium distributor 6 in the first perspective of the present application, Figure 7 It is a cross-sectional view of the medium distributor 6 in the second perspective of the present application.

[0068] For the medium distributor 6, such as Figures 4-7 As shown, the plurality of cooling plates 2 are respectively connected with the first pipe 401 and the second pipe 402 through the medium distributor 6, and the medium distributor 6 is used to realize the transfer and distribution of the cooling medium; specifically, the medium distributor 6 includes a medium distribution part 610, and the medium distribution part 610 is provided with a first cavity 611 connected with the inlet end of the cooling plate 2 and the first pipe 401; when the cooling medium enters the first cavity 611 of the medium distribution part 610 through the first pipe 401, the cooling medium can gradually fill the first cavity 611, and since the first cavity 611 is connected with the inlet end of each cooling plate 2, the cooling medium in the first cavity 611 can flow into each cooling plate 2, which is beneficial to fill the cooling medium in the second flow channel of the cooling plate 2, improve the uniformity of the cooling medium in different cooling plates 2, and thus improve the cooling effect of the liquid cooling system on the battery pack.

[0069] More specifically, the medium distributor 6 comprises a medium recovery part 620, and the medium recovery part 620 is provided with a second cavity 621 which is communicated with the outlet end of the cooling bottom plate 2 and the second pipeline 402 respectively; since the liquid cooling system has a plurality of cooling bottom plates 2, when the cooling medium flows from the cooling bottom plate 2 into the second cavity 621 of the medium recovery part 620, the cooling medium discharged from all the cooling bottom plates 2 can be converged through the second cavity 621, so as to be discharged through the second pipeline 402 communicated with the second cavity 621, thereby releasing the cooling medium carrying heat to the outside of the battery pack in time, and the cooling performance of the liquid cooling system is improved.

[0070] Further, the second cavity 621 is not communicated with the first cavity 611, so that the heat exchange between the cooling medium in the second cavity 621 and the first cavity 611 can be avoided, and the heat dissipation capacity of the cooling medium is not affected.

[0071] In some embodiments, the first pipeline 401 and the second pipeline 402 each comprise a converging pipe 410 and a diverging pipe 420, wherein the converging pipe 410 of the first pipeline 401 is communicated with the first cavity 611 and the diverging pipe 420 of the first pipeline 401 respectively, and the diverging pipe 420 of the first pipeline 401 is communicated with the inlet end of each cooling side plate 1 respectively; the converging pipe 410 of the second pipeline 402 is communicated with the second cavity 621 and the diverging pipe 420 of the second pipeline 402 respectively, and the diverging pipe 420 of the second pipeline 402 is communicated with the outlet end of each cooling side plate 1 respectively.

[0072] Further, for the first pipeline 401, as shown in Figure 1 and Figure 2 , the first pipeline 401 comprises a converging pipe 410 and a diverging pipe 420, and the converging pipe 410 of the first pipeline 401 is communicated with the first cavity 611 and the diverging pipe 420 of the first pipeline 401 respectively, and the diverging pipe 420 of the first pipeline 401 is communicated with the inlet end of each cooling side plate 1 respectively; specifically, when the first pipeline 401 is used to provide the cooling medium to the cooling side plate 1 and the cooling bottom plate 2, the first pipeline 401 can provide the cooling medium to the first cavity 611 of the medium distribution part 610 through the converging pipe 410, so as to ensure the delivery flow of the first cavity 611 and make the cooling medium fill the first cavity 611 quickly, and ensure that the medium distribution part 610 can provide the cooling medium to all the cooling bottom plates 2 synchronously; meanwhile, the first pipeline 401 can realize the diversion of the cooling medium through the diverging pipe 420, that is, the cooling is divided into multiple strands, and each strand of the cooling medium is delivered to the multiple cooling side plates 1 respectively, so as to ensure that the cooling medium can be provided to all the cooling side plates 1 synchronously, thereby ensuring the uniformity of the cooling of the liquid cooling system to the battery pack and improving the cooling performance of the battery pack.

[0073] Further, for the second pipeline 402, as shown in Figure 1and Figure 3 As shown, the second pipeline 402 includes a converging pipe 410 and a diverging pipe 420, the converging pipe 410 of the second pipeline 402 is communicated with the second cavity 621 and the diverging pipe 420 of the second pipeline 402 respectively, and the diverging pipe 420 of the second pipeline 402 is communicated with the outlet end of each cooling side plate 1; specifically, when the cooling medium carrying heat in the cooling side plate 1 and the cooling bottom plate 2 is discharged by using the second pipeline 402, the outlet end of the plurality of cooling side plates 1 is communicated with the diverging pipe 420 of the second pipeline 402, and the cooling medium carrying heat discharged by the plurality of cooling side plates 1 can be collected through the diverging pipe 420, and the cooling medium carrying heat recovered in the second cavity 621 in the medium recovery part 620 is discharged at the same time, that is, the cooling medium carrying heat can be timely and concentratedly released, so that the cooling effect of the liquid cooling system on the battery pack can be improved.

[0074] In some embodiments, the medium distributor 6 can include the features described in the following embodiment, which can be combined with Figures 5-7 to be described in detail.

[0075] As a feasible embodiment, the second cavity 621 is located above the first cavity 611, and one of the two sub-cooling plates 201 is arranged to be bent in the height direction of the cooling side plate 1, so that the outlet end of the cooling bottom plate 2 is communicated with the second cavity 621.

[0076] Further, as shown, Figures 5-7 by locating the second cavity 621 above the first cavity 611, the occupied space of the medium distributor 6 in the battery pack can be reduced; at the same time, since the second cavity 621 is communicated with the outlet end of the cooling bottom plate 2, and the first cavity 611 is communicated with the inlet end of the cooling bottom plate 2, the cooling medium can fill the second sub-flow channel of the sub-cooling plate 201 in the same cooling bottom plate 2 to ensure the cooling effect of the cooling bottom plate 2;

[0077] Further, one of the two sub-cooling plates 201 is arranged to be bent in the height direction of the cooling side plate 1, that is, in the direction Z, so that the outlet end of the cooling bottom plate 2 is communicated with the second cavity 621, so that the flatness of the surface of the cooling bottom plate 2 can be improved, and a larger cooling area can be formed on the surface of the cooling bottom plate 2 to ensure that the bottom of the single battery 9 can be in full contact with the surface of the cooling bottom plate 2.

[0078] As a feasible embodiment, at least one of the medium recovery part 620 and the medium distribution part 610 extends in the plurality of cooling side plates 1 in the second direction.

[0079] Specifically, as shown, Figure 6As shown, by extending the medium distribution portion 610 in the second direction of the cooling side plate 1, the first cavity 611 in the medium distribution portion 610 can be ensured to communicate with all the inlet ends of the cooling bottom plate 2, so as to ensure the supply effect of the cooling medium with cooling effect; more specifically, by extending the medium recovery portion 620 in the second direction of the cooling side plate 1, the second cavity 621 in the medium recovery portion 620 can be ensured to communicate with all the outlet ends of the cooling bottom plate 2, so as to timely and centrally recover the cooling medium carrying heat and improve the heat dissipation effect in the battery pack.

[0080] As a feasible embodiment, the medium recovery portion 620 is integrally connected with the medium distribution portion 610.

[0081] Specifically, as shown in Figure 6 and Figure 7 , by setting the medium recovery portion 620 and the medium distribution portion 610 in an integral connection, the connection strength between the two can be improved, so that the battery pack can be applied to more complex working conditions.

[0082] Exemplarily, the medium distributor 6 can be formed of aluminum and its alloy materials, which are light in weight and high in strength.

[0083] Exemplarily, the medium distributor 6 can be made by drawing process and form the corresponding medium recovery portion 620 and medium distribution portion 610, which is simple in process and low in cost.

[0084] In some embodiments, the top of the medium distributor 6 is provided with a heat exchange surface 7.

[0085] Further, as shown in Figures 5-7 , for the medium distributor 6, since the second cavity 621 is located above the first cavity 611, i.e., the medium recovery portion 620 is located above the medium distribution portion 610, at this time, the top of the medium distributor 6 forms a heat exchange surface 7; specifically, when there is no heating component on the heat exchange surface 7, if the temperature of the cooling medium in the second cavity 621 is higher than the ambient temperature, the heat of the cooling medium in the second cavity 621 can be released through the heat exchange surface 7, i.e., the heat is released through natural convection heat exchange.

[0086] More specifically, when there is a heating component on the heat exchange surface 7, if the temperature of the cooling medium in the second cavity 621 is lower than the heating component, the heat generated by the heating component can be absorbed through the heat exchange surface 7, so as to cool the heating component through the cooling medium, thereby improving the heat dissipation effect of the battery pack.

[0087] Exemplarily, the current collector of the battery pack can be arranged on the heat exchange surface 7, since the temperature of the current collector after being electrified is relatively high, the heat of the current collector can be transferred to the cooling medium in the medium recovery portion 620 through the heat exchange surface 7 of the medium distributor 6, so as to cool the current collector.

[0088] Exemplarily, the controller of the battery pack can be arranged on the heat exchange surface 7. Since a large amount of heat is generated during the operation of the controller, the heat exchange surface 7 of the medium distributor 6 can transfer the heat of the controller to the cooling medium in the medium recovery part 620, so as to cool the controller.

[0089] In some embodiments, at least one of the cooling side plate 1 and the cooling bottom plate 2 is a harmonica plate. Specifically, when the harmonica plate is used to form the cooling side plate 1 and / or the cooling bottom plate 2, the cooling medium can be uniformly distributed in the cooling side plate 1 and / or the cooling bottom plate 2, so as to ensure the uniformity of the cooling of the single battery 9. In addition, the process of using the harmonica plate to form the cooling side plate 1 and / or the cooling bottom plate 2 is simple and low in cost, which is conducive to reducing the cooling cost of the battery pack.

[0090] Exemplarily, the harmonica plate can be formed of plastic material, which is low in cost and conducive to lightweight design.

[0091] Exemplarily, the harmonica plate can be formed of metal material, which is low in cost and good in heat conduction performance, and is conducive to improving the utilization efficiency of the cooling medium.

[0092] In some embodiments, the first pipeline 401 and / or the second pipeline 402 is provided with a control switch 5 for controlling the on-off state of the cooling medium.

[0093] For the control switch 5, as shown in Figure 1 , Figure 2 and Figure 4 , by providing the first pipeline 401 and / or the second pipeline 402 with the control switch 5 for controlling the on-off state of the cooling medium, the state of the control switch 5 can be adjusted according to the use temperature of the battery pack. For example, when the maximum module temperature of the battery pack is lower than a preset temperature threshold, it indicates that the temperature of the battery pack is low, and the operation at this temperature will not affect the performance of the battery pack. At this time, the control switch 5 can be controlled to be in the closed state to reduce the energy consumption. For another example, when the maximum module temperature of the battery pack is higher than the preset temperature threshold, it indicates that the temperature of the battery pack is high, and the operation at this temperature may affect the performance of the battery pack. At this time, the control switch 5 can be controlled to be in the open state to cool the battery pack by the flowing cooling medium.

[0094] Exemplarily, the control switch 5 can be a valve body with a flow adjusting function, which is used to adjust the cooling effect of the liquid cooling system on the battery pack, which will not be described herein.

[0095] Based on the same inventive concept, the second aspect of the present application provides a battery pack with good heat dissipation performance, which is used to solve the problem of too fast temperature rise in the battery pack, and combines the Figures 8-10 exhibition content to be described in detail.

[0096] A battery pack comprises a box 8, a liquid cooling system as described in the first aspect, and a plurality of single batteries 9; wherein the first pipeline 401 and the second pipeline 402 are fixedly connected with the box 8; the plurality of single batteries 9 are arranged in the box 8, and the plurality of single batteries 9 are arranged in each accommodating part 3 and in the first direction.

[0097] Specifically, Figure 8 is a structural schematic diagram of the battery pack in the present application; Figure 9 is a structural schematic diagram of the liquid cooling system in the present application in the box 8, Figure 10 is a partial enlarged view of the first pipeline 401 and the second pipeline 402 at the end plate 10.

[0098] For the box 8, as shown in Figures 8-10 , in addition to supporting the liquid cooling system and the plurality of battery packs, the box 8 can also protect the periphery of the battery pack to avoid damage to the internal structure of the battery pack due to bumps; further, the first pipeline 401 and the second pipeline 402 are fixedly connected with the box 8, which can fix the first pipeline 401 and the second pipeline 402, improve the stability of the first pipeline 401 and the second pipeline 402, and facilitate the connection of the external pipeline structure with the first pipeline 401 and the second pipeline 402.

[0099] For the single battery 9, as shown in Figure 8 and Figure 10 , the battery pack has a plurality of single batteries 9 for storing and releasing electric energy, thereby constituting a battery pack with energy storage and energy supply functions; further, the plurality of single batteries 9 located in the accommodating part 3 are arranged in a straight line in the first direction, which can guarantee the arrangement number and arrangement density of the single batteries 9 in the battery pack, and guarantee that the battery pack has a larger capacity.

[0100] In some embodiments, the battery pack further comprises an end plate 10 arranged in the box 8; in the first direction, the end plate 10 is located at the end face of the cooling side plate 1 to limit the plurality of single batteries 9 in the accommodating part 3; the end plate 10 is provided with an open slot 1001 adapted to the inlet end and the outlet end of the cooling side plate 1, and the inlet end and the outlet end of the cooling side plate 1 are embedded in the open slot 1001.

[0101] For the end plate 10, as shown in Figure 8 and Figure 10 , the end plate 10 is arranged in the box 8; and the end plate 10 is located at the end face of the cooling side plate 1 in the first direction, so as to limit the plurality of single batteries 9 in the accommodating part 3; therefore, by applying the end plate 10 in the battery pack, the firmness of the battery pack inside the accommodating part 3 can be improved, and the overall strength of the battery pack can be improved, so that the battery pack is suitable for more complex working conditions.

[0102] More specifically, the end plate 10 is provided with an open slot 1001 adapted to the inlet end and outlet end of the cooling side plate 1, and the inlet end and outlet end of the cooling side plate 1 are embedded in the open slot 1001; by providing the end plate 10 with the open slot 1001, the inlet end and outlet end of the cooling side plate 1 can be limited, the firmness of the cooling side plate 1 in the box 8 is enhanced, and the flow path of the cooling medium between the first pipeline 401 and the cooling side plate 1 and the path of the cooling medium between the second pipeline 402 and the cooling side plate 1 is reduced.

[0103] In some embodiments, the box 8 is provided with the medium distributor 6 and the electrical components 11 on the top of the medium distributor 6; wherein the plurality of cooling bottom plates 2 are respectively connected to the first pipeline 401 and the second pipeline 402 through the medium distributor 6, so that the top surface of the medium distributor 6 exchanges heat with the electrical components 11.

[0104] For the battery pack, as shown in FIGS. Figure 8 and Figure 10 The box 8 is also provided with the medium distributor 6 and the electrical components 11, specifically, the medium distributor 6 is connected to the cooling bottom plate 2 in addition to being connected to the first pipeline 401 and the second pipeline 402, when the cooling medium flows into the medium distributor 6 through the first pipeline 401, the cooling medium can be evenly distributed to each cooling bottom plate 2 by the medium distributor 6, and the bottom of the monomer battery 9 in the battery pack is cooled by the cooling bottom plate 2; then, the cooling medium in the cooling bottom plate 2 can flow back to the medium distributor 6, the cooling medium flowing into the medium distributor 6 is collected by the medium distributor 6, and the cooling medium is discharged to the outside of the battery pack through the second pipeline 402 connected thereto, so as to complete the heat dissipation and realize the uniform distribution and centralized release of the cooling medium.

[0105] More specifically, the electrical components 11 of the battery pack can be arranged on the top surface of the medium distributor 6, on the one hand, the compact distribution between the medium distributor 6 and the electrical components 11 can improve the utilization rate of the internal space of the battery pack; on the other hand, since the medium distributor 6 has the cooling medium inside, when the electrical components 11 are installed on the top surface of the medium distributor 6, the top surface of the medium distributor 6 can be used as a heat exchange surface 7, and the heat exchange surface 7 can exchange heat with the electrical components 11 and cool the electrical components 11, thereby providing a good operating environment for the electrical components 11.

[0106] Exemplarily, the electrical components 11 in the battery pack can be a BDU (Battery Distribution Unit, battery distribution unit), which is mainly responsible for the power distribution, protection and management of the battery pack, and ensures the safe and efficient operation of the battery pack, which will not be described here.

[0107] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims.

[0108] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between various embodiments can be understood by referring to each other.

[0109] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the application to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application in order to design various embodiments with various modifications for specific use cases.

[0110] Those of ordinary skill in the art will understand that the above discussion of any embodiment is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the embodiments or technical features between different embodiments can also be combined, steps can be implemented in any order, and there are many other variations of the aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0111] Although the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications and variations will be apparent to those skilled in the art from the foregoing description.

[0112] Embodiments of the present application are intended to cover all such alternatives, modifications and variations as falling within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made in the spirit and principle of the embodiments of the present application shall be included in the protection scope of the present application.

Claims

1. A liquid cooling system applied to a battery pack, characterized in that, The liquid cooling system comprises: a plurality of cooling side plates and a plurality of cooling bottom plates, the plurality of cooling side plates and the plurality of cooling bottom plates extending in a first direction and arranged in parallel in a second direction perpendicular to the first direction; a space between two adjacent cooling side plates, and the two adjacent cooling side plates and at least one cooling bottom plate forming a containing part; and a first pipeline and a second pipeline, the first pipeline being connected to an inlet end of each cooling side plate and an inlet end of each cooling bottom plate, and the second pipeline being connected to an outlet end of each cooling side plate and an outlet end of each cooling bottom plate.

2. The liquid cooling system of claim 1, wherein, Each cooling side plate is provided with two groups of liquid cooling channels connected to the inlet end and the outlet end of the cooling side plate, and each group of liquid cooling channels comprises a plurality of first sub-flow channels extending in the first direction. The side of the cooling side plate away from the inlet end is provided with a first guide flow channel connected to the two groups of liquid cooling channels, and the flow directions of the cooling medium in the two groups of liquid cooling channels are opposite.

3. The liquid cooling system of claim 2, wherein, In the height direction of the cooling side plate, the outlet end of the same cooling side plate is located above the inlet end. The height direction of the cooling side plate is perpendicular to the first direction and the second direction.

4. The liquid cooling system of claim 1, wherein, Each cooling bottom plate comprises two sub-cooling plates, and each sub-cooling plate is provided with a plurality of second sub-flow channels extending in the first direction. The side of the cooling bottom plate away from the inlet end is provided with a second guide flow channel connected to the two sub-cooling plates, and the flow directions of the cooling medium in the two sub-cooling plates are opposite.

5. The liquid cooling system of claim 1, wherein, A strip-shaped gap is formed between the two sub-cooling plates of the same cooling bottom plate.

6. The liquid cooling system of claim 4, wherein, The plurality of cooling bottom plates are connected to the first pipeline and the second pipeline through a medium distributor, and the medium distributor comprises: a medium distribution part provided with a first cavity connected to the inlet end of the cooling bottom plate and the first pipeline; a medium recovery part provided with a second cavity connected to the outlet end of the cooling bottom plate and the second pipeline; The second cavity is not connected to the first cavity.

7. The liquid cooling system of claim 6, wherein, The first pipeline and the second pipeline each comprise a converging pipe and a diverging pipe, and the converging pipe of the first pipeline is connected to the first cavity and the diverging pipe of the first pipeline, and the diverging pipe of the first pipeline is connected to the inlet end of each cooling side plate; the converging pipe of the second pipeline is connected to the second cavity and the diverging pipe of the second pipeline, and the diverging pipe of the second pipeline is connected to the outlet end of each cooling side plate.

8. The liquid cooling system according to claim 6, wherein the second cavity is located above the first cavity, one of the two sub-cooling plates is arranged in a bent manner in the height direction of the cooling side plate, so that the outlet end of the cooling bottom plate is connected to the second cavity; and / or at least one of the medium recovery part and the medium distribution part extends in the second direction; and / or the medium recovery part and the medium distribution part are integrally connected.

9. The liquid cooling system of any of claims 6-8, wherein, The top of the medium distributor is provided with a heat exchange surface.

10. The liquid cooling system of claim 1, wherein, At least one of the cooling side plate and the cooling bottom plate is a harmonica plate.

11. The liquid cooling system of claim 1, wherein, The first pipeline and / or the second pipeline is provided with a control switch for controlling the on-off state of the cooling medium.

12. A battery pack, characterized by, The liquid cooling system comprises: a box body; The first pipeline and the second pipeline are fixedly connected to the box body according to any one of claims 1-11. and a plurality of single batteries, the plurality of single batteries are arranged in the box body, and the plurality of single batteries are arranged in each of the accommodating portions and in the first direction.

13. The battery pack of claim 12, wherein, Further comprising: an end plate arranged in the box body; in the first direction, the end plate is located at the end surface of the cooling side plate to limit the plurality of single batteries in the accommodating portion; the end plate is provided with an open slot matching the inlet end and the outlet end of the cooling side plate, and the inlet end and the outlet end of the cooling side plate are embedded in the open slot.

14. The battery pack of claim 12, wherein, The box body is provided with a medium regulator and an electrical component on the top of the medium regulator; wherein the plurality of cooling bottom plates are respectively connected to the first pipeline and the second pipeline through the medium regulator, so that the top surface of the medium regulator exchanges heat with the electrical component.

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