Liquid-cooled battery pack and vehicle

Abstract

The utility model provides a liquid-cooled battery pack and a vehicle. The liquid-cooled battery pack comprises a box body which is provided with a containing cavity, a liquid inlet and a liquid outlet, wherein the liquid inlet and the liquid outlet are communicated with the containing cavity; the liquid separation part is at least partially arranged in the accommodating cavity, the accommodating cavity is divided into a first chamber and a second chamber along the first direction by the liquid separation part, the second chamber is used for accommodating the battery module, the liquid separation part is provided with a plurality of liquid separation holes, the liquid separation holes are used for communicating the first chamber with the second chamber, the liquid inlet is communicated with the first chamber, and the liquid outlet is communicated with the second chamber. According to the technical scheme, the technical problem of uneven heat dissipation can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid-cooled battery packs, and particularly relates to a liquid-cooled battery pack and a vehicle. Background Art

[0002] In the related art, due to the continuous increase in the capacity of the battery pack, a lot of heat is generated during the operation of the battery pack. If this heat cannot be discharged in time, the temperature inside the battery pack will continue to rise. In the light case, the temperature difference of the battery packs at different positions in the battery pack will become larger and larger, thus affecting the service life of the battery pack. In the heavy case, the battery pack will not be able to work or even explode due to excessive heat, thus triggering serious accidents.

[0003] Most of the traditional battery pack heat dissipation methods are liquid-cooled heat dissipation modes, which use the temperature difference for liquid-cooled exchange to dissipate the heat inside the battery pack. However, when injecting the coolant into the battery pack, it is impossible to ensure that the coolant evenly flows through each position inside the battery pack, resulting in different temperatures at different positions of the battery pack, which will cause a temperature difference between the components inside the battery pack and affect the normal operation of the battery modules inside the battery pack. Summary of the Utility Model

[0004] The embodiments of the utility model provide a liquid-cooled battery pack and a vehicle, which can improve the technical problem of uneven heat dissipation.

[0005] In a first aspect, the embodiments of the utility model provide a liquid-cooled battery pack, which includes: a box body having a receiving cavity, a liquid inlet and a liquid outlet communicated with the receiving cavity; a liquid dividing member at least partially disposed in the receiving cavity, the liquid dividing member divides the receiving cavity into a first chamber and a second chamber along a first direction, the second chamber is used to accommodate battery modules, the liquid dividing member has a plurality of liquid dividing holes for communicating the first chamber with the second chamber, the liquid inlet is communicated with the first chamber, and the liquid outlet is communicated with the second chamber.

[0006] In one embodiment, a plurality of liquid dividing holes are arranged in an array on the liquid dividing member.

[0007] In one embodiment, the radius of the liquid dividing hole is R, and 12mm ≤ R ≤ 20mm.

[0008] In one embodiment, the radii of at least two liquid dividing holes are different.

[0009] In one embodiment, the center distance between adjacent two liquid dividing holes is L, and 50mm ≤ L ≤ 100mm.

[0010] In one embodiment, the liquid separation member includes a connection structure and a liquid separation plate. The liquid separation member is connected to the box body through the connection structure. The liquid separation plate is disposed in the accommodation cavity and above the battery module to divide the accommodation cavity into a first chamber and a second chamber. The liquid separation plate has a plurality of liquid separation holes.

[0011] In one embodiment, the box body includes: a housing having an accommodation cavity; a cover body covering the housing. The connection structure is disposed between the housing and the cover body, and at least part of the connection structure overlaps with the periphery of the housing.

[0012] In one embodiment, the liquid-cooled battery pack further includes a sealing assembly disposed between the connection of the connection structure and the cover body and / or the connection of the housing.

[0013] In one embodiment, the sealing assembly includes a first sealing member and a second sealing member. The first sealing member is disposed between the connection of the connection structure and the cover body, and the first sealing member is disposed between the connection of the connection structure and the housing.

[0014] In a second aspect, an embodiment of the present invention provides a vehicle, which includes the liquid-cooled battery pack as described above.

[0015] Applying the technical solution of the present invention, a liquid separation member is disposed in the accommodation cavity of the box body, and the liquid separation member has a plurality of liquid separation holes. When the coolant flows into the first chamber from the liquid inlet, it is separated through the plurality of liquid separation holes, enabling the coolant to flow evenly into the second chamber through the liquid separation holes, thereby facilitating the uniform cooling of the components in the second chamber by the coolant. For example, the battery module in the second chamber, which can make the temperatures at different positions of the battery pack tend to be the same as much as possible, reducing the temperature difference between the components in the battery pack, and thus ensuring the normal operation of the battery module in the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 is an exploded schematic view of the liquid-cooled battery pack provided by the embodiment of the present invention;

[0018] Figure 2 is a schematic structural view of the liquid-cooled battery pack provided by the embodiment of the present invention;

[0019] Figure 3 is a top view schematic of the liquid-cooled battery pack provided by the embodiment of the present invention;

[0020] Figure 4 Yes Figure 3 The schematic cross-sectional view at A-A in it;

[0021] Figure 5 It is the schematic structural view of the liquid separation part provided by the embodiment of the present utility model.

[0022] Among them, the above-mentioned drawings include the following reference numerals:

[0023] 10, box body; 11, accommodating cavity; 111, first chamber; 112, second chamber; 12, liquid inlet; 13, liquid outlet; 14, housing; 15, cover body;

[0024] 20, liquid separation part; 21, liquid separation holes; 22, connection structure; 23, liquid separation plate;

[0025] 30, sealing assembly; 31, first seal; 32, second seal;

[0026] 40, battery module;

[0027] X, first direction. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present utility model.

[0029] As Figures 1 to 5 shown, in the first aspect, the embodiment of the present utility model provides a liquid-cooled battery pack, and the liquid-cooled battery pack includes: a box body 10 having an accommodating cavity 11 and a liquid inlet 12 and a liquid outlet 13 communicated with the accommodating cavity 11; a liquid separation part 20, at least partially disposed in the accommodating cavity 11, the liquid separation part 20 divides the accommodating cavity 11 into a first chamber 111 and a second chamber 112 along the first direction, the second chamber 112 is used to accommodate the battery module 40, the liquid separation part 20 has a plurality of liquid separation holes 21, and the liquid separation holes 21 are used to communicate the first chamber 111 and the second chamber 112, the liquid inlet 12 is communicated with the first chamber 111, and the liquid outlet 13 is communicated with the second chamber 112.

[0030] Applying the technical solution of the present utility model, a liquid separation member 20 is arranged in the accommodation cavity 11 of the box body 10, and the liquid separation member 20 has a plurality of liquid separation holes 21. When the coolant flows into the first chamber 111 from the liquid inlet 12, it is separated through the plurality of liquid separation holes 21, enabling the coolant to flow evenly into the second chamber 112 from the liquid separation holes 21, thereby facilitating the uniform cooling of the components in the second chamber 112 by the coolant. For example, the battery module 40 in the second chamber 112, which can make the temperatures at different positions of the battery pack tend to be the same as much as possible, reducing the temperature difference between the components in the battery pack, and thus ensuring the normal operation of the battery module 40 in the battery pack.

[0031] In this application, X is specifically the height direction of the box body 10.

[0032] In this application, the coolant is specifically cooling silicone oil, which is a special industrial liquid mixed with components such as organosilicon base oil, processing aids, and lubricating oil. It has excellent thermal stability, electrical insulation, oxidation resistance, and chemical corrosion resistance. Cooling silicone oil can maintain stable performance in a high-temperature environment, effectively dissipating the huge heat generated inside the equipment quickly and preventing the equipment from being damaged due to high temperature. Cooling silicone oil has good electrical insulation performance, so using it to cool the components in the accommodation cavity 11 can ensure the normal operation of the components and avoid the occurrence of electrical failures. At the same time, cooling silicone oil has good oxidation resistance, can maintain stable performance during long-term use, extend the service life, and thus reduce the usage cost of the coolant.

[0033] Furthermore, cooling silicone oil has good corrosion resistance to a variety of chemical substances and can remain stable in a harsh chemical environment, so it can avoid being affected by the electrolyte, thereby improving the cooling performance of cooling silicone oil. At the same time, cooling silicone oil also has certain lubricating properties, which can reduce the friction and wear between components during the operation of the battery module 40 and improve the service life of the equipment.

[0034] The preparation methods of cooling silicone oil mainly include the water method and the gas phase method. The water method is to add pure dimethylchlorosilane into a reactor containing water and the corresponding acidic solvent, react to generate dimethyl silicate and hydrochloric acid, further react to generate polydimethylsiloxane, and finally obtain silicone oil through methods such as distillation. The gas phase method includes the oxidation method and the acid catalysis method. Through the action of high temperature and catalyst, dimethylchlorosilane is converted into polydimethylsiloxane, and then silicone oil is obtained through methods such as distillation.

[0035] Among them, the material selection of the box body 10 has an important impact on the performance, safety and durability of the battery. The material of the box body 10 can be made of aluminum alloy. Since the aluminum alloy has the characteristics of light weight, high strength, good thermal conductivity and relatively low price, the box body 10 made of aluminum alloy has high reliability, good surface finish and anti-corrosion effect. Its heat dissipation performance is excellent, which can effectively avoid the overheating of the battery module 40 from damaging the performance of the box body 10. Thus, it can meet the usage requirements of the box body 10.

[0036] Optionally, the material of the box body 10 can also be stainless steel. Since stainless steel has the characteristics of high stiffness, high strength, anti-corrosion and not easy to corrode, the stainless steel battery box has good protection effect on chemical substances such as electrolyte and infiltration liquid, and is suitable for anti-corrosion in harsh environments. Therefore, it can extend the service life of the box body 10 and reduce the usage cost of the box body 10.

[0037] In one embodiment, a plurality of liquid distribution holes 21 are arranged in an array on the liquid distribution member 20. By setting the above structure, the plurality of liquid distribution holes 21 are evenly arranged, realizing efficient space utilization and layout. This arrangement enables precise control of parameters such as the spacing, size and shape between the plurality of liquid distribution holes 21, thereby improving the regularity and stability of the overall structure. At the same time, it is also convenient for the processing of the liquid distribution holes 21, which is beneficial to improving the processing efficiency of the liquid distribution holes 21. Meanwhile, the arrangement of the liquid distribution hole 21 array is conducive to achieving high-precision processing and manufacturing. Since the liquid distribution holes 21 are arranged in a predetermined array, the parameters such as the position, size and shape of the liquid distribution holes 21 can be highly consistent through automated and standardized processing equipment, improving the processing accuracy of the liquid distribution holes 21.

[0038] Optionally, in other embodiments of the present application, the plurality of liquid distribution holes 21 may not be arranged in an array and can be arranged according to the usage environment of the device, so as to improve the applicability and scope of application of the device to meet the usage requirements of the device in different environments.

[0039] In one embodiment, the radius of the liquid separation hole 21 is R, where 12 mm ≤ R ≤ 20 mm. When R > 20 mm, the radius of the liquid separation hole 21 is too large. Due to the limited space of the liquid separation member 20, the distance between two adjacent liquid separation holes 21 is too small, which not only reduces the number of liquid separation holes 21 that can be provided, but also is not conducive to the liquid separation of the coolant among multiple liquid separation holes 21. When R < 12 mm, the radius of the liquid separation hole 21 is too small, which makes it difficult for the coolant to pass through the liquid separation hole 21, reducing the unit flow rate of the coolant flowing from the first chamber 111 into the second chamber 112, and thus unable to uniformly cool the components in the second chamber 112 in a timely manner, which will affect the normal use of the liquid-cooled battery pack. Therefore, setting 12 mm ≤ R ≤ 20 mm can not only enable a sufficient number of liquid separation holes 21 to be provided on the liquid separation member 20, facilitating the liquid separation of the coolant among multiple liquid separation holes 21, but also facilitate the passage of the coolant through the liquid separation holes 21, increasing the unit flow rate of the coolant flowing from the first chamber 111 into the second chamber 112, so as to uniformly cool the components in the second chamber 112 in a timely manner, thus enabling the normal use of the liquid-cooled battery pack. Optionally, R can be set to values such as 12 mm, 16 mm, or 20 mm, and the specific setting should be selected according to the use environment of the liquid separation member 20, and no specific limitation is made here.

[0040] In the present application, the diameter of the liquid separation hole 21 is set to 16 mm.

[0041] In one embodiment, the radii of at least two liquid separation holes 21 are different. With this setting, the flow rates of the coolant in the two liquid separation holes 21 with different radii can be made different, so as to meet the setting conditions at different positions in the accommodation chamber 11. Therefore, the applicability and application range of the device can be further improved.

[0042] In one embodiment, the center distance between two adjacent liquid distribution holes 21 is L, where 50 mm ≤ L ≤ 100 mm. When L > 100 mm, the center distance between two adjacent liquid distribution holes 21 is too large. Due to the limited space of the liquid distribution member 20, the number of liquid distribution holes 21 provided will be reduced, and it is also not conducive to the liquid distribution of the coolant among multiple liquid distribution holes 21. When L < 50 mm, the center distance between two adjacent liquid distribution holes 21 is too small, which is not convenient for the processing of the liquid distribution holes 21 and will also affect the flow of the coolant between two adjacent liquid distribution holes 21, resulting in uneven liquid distribution. Therefore, setting 50 mm ≤ L ≤ 100 mm can not only enable a sufficient number of liquid distribution holes 21 to be provided on the liquid distribution member 20, facilitating the liquid distribution of the coolant among multiple liquid distribution holes 21, but also facilitating the flow of the coolant between two adjacent liquid distribution holes 21, so as to uniformly cool the components in the second chamber 112 in a timely manner, thus enabling the normal use of the liquid-cooled battery pack. Optionally, L can be set to values such as 50 mm, 75 mm, or 100 mm. The specific setting should be selected according to the usage environment of the liquid distribution member 20, and no specific limitation is made here.

[0043] In one embodiment, the liquid distribution member 20 includes a connection structure 22 and a liquid distribution plate 23. The liquid distribution member 20 is connected to the box body 10 through the connection structure 22. The liquid distribution plate 23 is disposed in the accommodation cavity 11 and above the battery module 40 to divide the accommodation cavity 11 into a first chamber 111 and a second chamber 112. The liquid distribution plate 23 has a plurality of liquid distribution holes 21. With such a setting, the stability of the liquid distribution member 20 after being installed with the box body 10 can be ensured.

[0044] In one embodiment, the box body 10 includes: a housing 14 having an accommodation cavity 11; a cover body 15 covering the housing 14. The connection structure 22 is disposed between the housing 14 and the cover body 15, and at least part of the connection structure 22 overlaps with the periphery of the housing 14. By setting the above structure, the connection strength between the connection structure 22 and the cover body 15 and the housing 14 can be improved, so that the liquid distribution member 20 will not shift after installation, which is beneficial to maintaining the normal operation of the liquid distribution member 20.

[0045] In the present application, the housing 14 and the cover body 15 are fixedly connected by bolts. Bolt connection usually uses high-strength bolts and nuts. By applying a certain torque, the housing 14 and the cover body 15 are firmly connected together, enabling the housing 14 and the cover body 15 to bear a large load, thus achieving their tight fixation. At the same time, the bolt connection method can be easily disassembled. Only tools such as a wrench or a torque wrench are needed to easily disassemble the bolts and nuts. This feature makes bolt fixation very practical in occasions that require frequent maintenance and replacement. And bolt connection only requires correct installation of the bolts and nuts to connect the housing 14 and the cover body 15, without complex processes and equipment.

[0046] Furthermore, bolt connections usually adopt measures such as lock washers and nut locking agents, which can effectively prevent connection loosening caused by factors such as vibration or shock. Thereby improving the stability and reliability of the bolt fixation in harsh environments.

[0047] In one embodiment, the liquid-cooled battery pack further includes a sealing assembly 30, and the sealing assembly 30 is disposed between the connection structure 22 and the lid 15 and / or between the connection parts of the housing 14. By providing the above structure, it is possible to prevent the coolant from flowing out of the gap between the liquid distribution member 20 and the box body 10, thereby improving the sealing effect of the box body 10 and avoiding waste of the coolant.

[0048] In one embodiment, the sealing assembly 30 includes a first seal 31 and a second seal 32. The first seal 31 is disposed between the connection structure 22 and the lid 15, and the first seal 31 is disposed between the connection structure 22 and the housing 14. With such an arrangement, the first seal 31 and the second seal 32 are respectively disposed above and below the connection structure 22, which can improve the sealing effect between the liquid distribution member 20 and the box body 10 as much as possible.

[0049] Specifically, the materials of the first seal 31 and the second seal 32 can be nitrile rubber, ethylene propylene diene monomer rubber, fluororubber, silica gel, etc., and no specific limitation is made here.

[0050] In a second aspect, an embodiment of the present invention provides a vehicle, and the vehicle includes the liquid-cooled battery pack as described above.

[0051] Applying the technical solution of the present invention, a liquid distribution member 20 is disposed in the accommodation cavity 11 of the box body 10, and the liquid distribution member 20 has a plurality of liquid distribution holes 21. When the coolant flows into the first chamber 111 from the liquid inlet 12, it is separated through the plurality of liquid distribution holes 21, and the coolant can flow evenly into the second chamber 112 from the liquid distribution holes 21, so as to facilitate the uniform cooling of the components in the second chamber 112 by the coolant. For example, the battery module 40 in the second chamber 112. In this way, the temperatures at different positions of the battery pack can be made as close as possible to the same, reducing the temperature difference between the components in the battery pack, thereby enabling the normal operation of the battery module 40 in the battery pack.

[0052] It should be noted that the terms used here are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in accordance with actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0054] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are generally based on the orientation or positional relationships shown in the drawings. These are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms 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. Therefore, they should not be construed as limiting the protection scope of the present utility model; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0055] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above" can be used here to describe the spatial positional relationships of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0056] In addition, it should be noted that the use of words such as "first", "second" to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings. Therefore, they should not be construed as limiting the protection scope of the present utility model.

[0057] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A liquid-cooled battery pack, characterized in that: The liquid-cooled battery pack comprises: A box body, comprising a containing cavity and a liquid inlet and a liquid outlet communicated with the containing cavity; The liquid separating component is at least partially arranged in the accommodating chamber, and the liquid separating component divides the accommodating chamber into a first chamber and a second chamber along a first direction. The second chamber is used to accommodate a battery module. The liquid separating component has a plurality of liquid separating holes, and the liquid separating holes are used to connect the first chamber and the second chamber. The liquid inlet is connected to the first chamber, and the liquid outlet is connected to the second chamber.

2. The liquid-cooled battery pack according to claim 1, characterized in that: A plurality of liquid separation hole arrays are arranged on the liquid separation member.

3. The liquid-cooled battery pack according to claim 1, characterized in that: The radius of the liquid separation hole is R, 12mm≤R≤20mm.

4. The liquid-cooled battery pack according to claim 1, characterized in that: At least two of the liquid separation holes have different radii.

5. The liquid-cooled battery pack according to any one of claims 1 to 4, characterized in that: The center distance between two adjacent liquid separation holes is L, 50mm≤L≤100mm.

6. The liquid-cooled battery pack according to claim 1, characterized in that: The liquid separation component includes a connecting structure and a liquid separation plate. The liquid separation component is connected to the box body through the connecting structure. The liquid separation plate is arranged in the accommodating cavity and located above the battery module to separate the accommodating cavity into the first chamber and the second chamber. The liquid separation plate has a plurality of liquid separation holes.

7. The liquid-cooled battery pack according to claim 6, characterized in that: The box body comprises: A housing having the accommodating cavity; The cover body is disposed on the shell, the connecting structure is disposed between the shell and the cover body, and the connecting structure is at least partially overlapped with the periphery of the shell.

8. The liquid-cooled battery pack according to claim 7, characterized in that: The liquid-cooled battery pack further includes a sealing assembly, which is disposed between a connection point between the connection structure and the cover body and / or a connection point between the shell body.

9. The liquid-cooled battery pack according to claim 8, characterized in that: The sealing assembly includes a first sealing member and a second sealing member, wherein the first sealing member is arranged between the connection structure and the cover body, and the second sealing member is arranged between the connection structure and the shell body.

10. A vehicle, characterized in that: The vehicle comprises a liquid-cooled battery pack as claimed in any one of claims 1 to 9.

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