Battery case

Abstract

The application provides a battery box, which comprises a box assembly and two partition plates, the two partition plates divide an internal cavity of the box assembly into three independent cavity parts; a first containing cavity is used for filling cooling liquid and placing a battery pack, so that the battery pack is immersed in the cooling liquid in the first containing cavity; a first liquid inlet and a first liquid outlet are both in communication with the first containing cavity, a second liquid inlet and a second liquid outlet are both in communication with the second containing cavity; the first liquid inlet and the second liquid outlet are in communication, so that the cooling liquid in the second containing cavity enters the first containing cavity; the second liquid inlet and the first liquid outlet are in communication, so that the cooling liquid in the first containing cavity enters the second containing cavity; a third containing cavity is used for filling refrigerant, the refrigerant in the third containing cavity exchanges heat with the cooling liquid in the second containing cavity. The battery box solves the problem that the existing battery heat dissipation mode causes temperature difference of the battery module itself.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery box. BACKGROUND

[0002] With the popularization of new energy vehicles, the lithium ion battery industry has developed rapidly. With the increasing demand of users for fast charging and long cycle life of new energy vehicles, it is necessary to further improve the temperature uniformity of battery monomers; at the same time, due to the demand of new energy vehicles for long endurance mileage, the energy density of the battery is getting higher and higher, so the requirement for battery thermal management is getting higher and higher; the battery needs to meet the adaptability requirements of harsh environment, and the demand for inhibiting the thermal runaway of the battery is also getting higher and higher. It is more and more important to effectively cool the lithium ion battery.

[0003] The existing cooling structure is mostly a water cooling structure arranged at the bottom of the battery pack. The water cooling structure is in direct contact with the bottom of the battery module and cools the battery module, so that there is a temperature difference in the thickness direction of the battery module. This temperature difference will affect the service life of the battery pack, reduce the usability of the battery pack, and increase the risk of battery thermal runaway. SUMMARY

[0004] The main purpose of the present application is to provide a battery box to solve the problem that the existing battery cooling method will cause temperature difference in the battery module itself.

[0005] In order to achieve the above purpose, the present application provides a battery box, which comprises: a box assembly, the box assembly has an internal cavity; two partition plates, the two partition plates are arranged in the internal cavity along the depth direction of the internal cavity to divide the internal cavity into three independent cavity parts; the three cavity parts are a first containing cavity, a second containing cavity and a third containing cavity arranged in sequence; wherein the first containing cavity is used to fill cooling liquid and is used to place a battery pack, so that the battery pack is immersed in the cooling liquid in the first containing cavity; the box assembly is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet and a second liquid outlet, the first liquid inlet and the first liquid outlet are both communicated with the first containing cavity, the second liquid inlet and the second liquid outlet are both communicated with the second containing cavity; the first liquid inlet and the second liquid outlet are communicated to make the cooling liquid in the second containing cavity enter the first containing cavity; the second liquid inlet and the first liquid outlet are communicated to make the cooling liquid in the first containing cavity enter the second containing cavity; the third containing cavity is used to fill refrigerant, and the heat of the cooling liquid in the second containing cavity is absorbed by making the refrigerant in the third containing cavity exchange heat with the cooling liquid in the second containing cavity.

[0006] Further, the battery box further comprises one or a plurality of partition plates arranged in the first direction, the one or the plurality of partition plates are arranged in the first accommodating cavity to divide the first accommodating cavity into a plurality of first cavity portions arranged in the first direction in sequence; each partition plate is provided with a communication opening to communicate two first cavity portions on both sides of the partition plate; the battery pack comprises a plurality of battery units, each battery unit comprises a plurality of batteries; the plurality of first cavity portions are arranged in one-to-one correspondence with the plurality of battery units, and the plurality of batteries of each battery unit are arranged in the corresponding first cavity portion.

[0007] Further, each partition plate is a strip-shaped plate, and the extension direction of each partition plate is perpendicular to the first direction; each partition plate has a first end and a second end arranged oppositely in the extension direction of the partition plate; when the partition plate is one, the one end of the partition plate is provided with the communication opening; when the partition plate is a plurality, along the first direction, two adjacent partition plates are a first partition plate and a second partition plate respectively, the first end of the first partition plate is provided with the communication opening, and the second end of the second partition plate is provided with the communication opening.

[0008] Further, along the arrangement sequence in the first direction, the first cavity portion located at the first sequence in the plurality of first cavity portions is a first first cavity portion, and the first cavity portion located at the last sequence in the plurality of first cavity portions is a last first cavity portion; the first liquid inlet communicates with the first first cavity portion, and the first liquid outlet communicates with the last first cavity portion.

[0009] Further, when the partition plate is one, the one end of the partition plate is arranged in the interval between the cavity wall of the first accommodating cavity, so that the interval space between the one end of the partition plate and the cavity wall of the first accommodating cavity forms the communication opening; when the partition plate is a plurality, the first end of the first partition plate is arranged in the interval between the cavity wall of the first accommodating cavity, so that the interval space between the first end of the first partition plate and the cavity wall of the first accommodating cavity forms the communication opening; and / or the second end of the second partition plate is arranged in the interval between the cavity wall of the first accommodating cavity, so that the interval space between the second end of the second partition plate and the cavity wall of the first accommodating cavity forms the communication opening.

[0010] Further, the second accommodating cavity has a first end and a second end arranged oppositely, the second liquid inlet and the second liquid outlet are communicated with the first end and the second end of the second accommodating cavity respectively; the two partition plates are a first partition plate and a second partition plate respectively; the battery box further comprises a first flow disturbing component arranged in the second accommodating cavity, the first flow disturbing component comprises: a plurality of first protruding portions, each first protruding portion protrudes from the surface of the first partition plate towards the second partition plate; the protruding end surface of each first protruding portion is arranged spaced apart from the second partition plate; and / or a plurality of second protruding portions, each second protruding portion protrudes from the surface of the second partition plate towards the first partition plate; the protruding end surface of each second protruding portion is arranged spaced apart from the first partition plate; wherein, when the first flow disturbing component comprises a plurality of first protruding portions, the plurality of first protruding portions are arranged spaced apart along the distribution direction of the first end and the second end of the second accommodating cavity; when the first flow disturbing component comprises a plurality of second protruding portions, the plurality of second protruding portions are arranged spaced apart along the distribution direction of the first end and the second end of the second accommodating cavity; when the first flow disturbing component comprises a plurality of first protruding portions and a plurality of second protruding portions, the plurality of first protruding portions and the plurality of second protruding portions are arranged alternately and spaced apart along the distribution direction of the first end and the second end of the second accommodating cavity, so as to form a zigzag first channel between the plurality of first protruding portions and the plurality of second protruding portions.

[0011] Further, the battery box further comprises one or a plurality of partition portions arranged spaced apart along the second direction, the one or the plurality of partition portions are arranged in the second accommodating cavity, so as to divide the second accommodating cavity into a plurality of second cavity portions arranged along the second direction; each partition portion is provided with a first opening to communicate two second cavity portions on both sides of the partition portion.

[0012] Further, the battery box further comprises a plurality of first flow disturbing components, the plurality of first flow disturbing components are arranged in the plurality of second cavity portions one by one; the two partition plates are a first partition plate and a second partition plate respectively; the first flow disturbing component comprises: a plurality of first protruding portions, each first protruding portion protrudes from the surface of the first partition plate towards the second partition plate; the protruding end surface of each first protruding portion is arranged spaced apart from the second partition plate; and / or a plurality of second protruding portions, each second protruding portion protrudes from the surface of the second partition plate towards the first partition plate; the protruding end surface of each second protruding portion is arranged spaced apart from the first partition plate; wherein, when the first flow disturbing component comprises a plurality of first protruding portions, the plurality of first protruding portions are arranged spaced apart along the flow direction of the cooling liquid in the second cavity portion; when the first flow disturbing component comprises a plurality of second protruding portions, the plurality of second protruding portions are arranged spaced apart along the flow direction of the cooling liquid in the second cavity portion; when the first flow disturbing component comprises a plurality of first protruding portions and a plurality of second protruding portions, the plurality of first protruding portions and the plurality of second protruding portions are arranged alternately and spaced apart along the flow direction of the cooling liquid in the second cavity portion, so as to form a zigzag first channel between the plurality of first protruding portions and the plurality of second protruding portions.

[0013] Further, each first protruding part is in a strip structure; along the extending direction of each first protruding part, each first protruding part comprises a first protruding section and a second protruding section connected with each other, the first protruding section and the second protruding section of each first protruding part are arranged at a first included angle, the lifting direction of the first included angle of each first protruding part is the same as the direction from the first end to the second end of the second accommodating cavity or the flow direction of the cooling liquid in the second cavity part; and / or each second protruding part is in a strip structure; along the extending direction of each second protruding part, each second protruding part comprises a third protruding section and a fourth protruding section connected with each other, the third protruding section and the fourth protruding section of each second protruding part are arranged at a second included angle, the lifting direction of the second included angle of each second protruding part is the same as the direction from the first end to the second end of the second accommodating cavity or the flow direction of the cooling liquid in the second cavity part.

[0014] Further, the two partition plates are respectively a first partition plate and a second partition plate, the third accommodating cavity is located between the second partition plate and the bottom wall of the internal cavity of the box assembly; the box assembly is provided with a refrigerant inlet and a refrigerant outlet; the third accommodating cavity has oppositely arranged first and second ends, and the refrigerant inlet and the refrigerant outlet are in communication with the first and second ends of the third accommodating cavity respectively; the battery box further comprises a second flow disturbing part arranged in the third accommodating cavity, the second flow disturbing part comprises: a plurality of third protruding parts, each third protruding part protrudes from the surface of the second partition plate towards the bottom wall of the internal cavity; the protruding end surface of each third protruding part is spaced apart from the bottom wall of the internal cavity; and / or a plurality of fourth protruding parts, each fourth protruding part protrudes from the bottom wall of the internal cavity towards the second partition plate; the protruding end surface of each fourth protruding part is spaced apart from the second partition plate; wherein, when the second flow disturbing part comprises a plurality of third protruding parts, the plurality of third protruding parts are spaced apart along the distribution direction of the first and second ends of the third accommodating cavity; when the second flow disturbing part comprises a plurality of fourth protruding parts, the plurality of fourth protruding parts are spaced apart along the distribution direction of the first and second ends of the third accommodating cavity; when the second flow disturbing part comprises a plurality of third protruding parts and a plurality of fourth protruding parts, the plurality of third protruding parts and the plurality of fourth protruding parts are sequentially staggered and spaced apart along the distribution direction of the first and second ends of the third accommodating cavity, so as to form a zigzag second channel between the plurality of third protruding parts and the plurality of fourth protruding parts.

[0015] Further, the battery box further comprises: one or a plurality of division parts spaced apart along the third direction, the one or the plurality of division parts are arranged in the third accommodating cavity to divide the third accommodating cavity into a plurality of third cavity parts arranged along the third direction; each division part is provided with a second opening to communicate two third cavity parts on both sides of the division part; wherein, the box assembly is provided with a refrigerant inlet and a refrigerant outlet, and the refrigerant inlet and the refrigerant outlet are in communication with the third accommodating cavity.

[0016] Further, the two partition plates are a first partition plate and a second partition plate, and the third accommodating cavity is located between the second partition plate and a bottom wall of the internal cavity of the box assembly; the battery box further comprises a plurality of second flow disturbing components, and the plurality of second flow disturbing components are arranged in the plurality of third cavity portions one by one; the second flow disturbing component comprises: a plurality of third protruding portions, each third protruding portion protrudes from a plate surface of the second partition plate towards the bottom wall of the internal cavity; the protruding end surface of each third protruding portion is arranged in a spaced manner with the bottom wall of the internal cavity; and / or a plurality of fourth protruding portions, each fourth protruding portion protrudes from the bottom wall of the internal cavity towards the second partition plate; the protruding end surface of each fourth protruding portion is arranged in a spaced manner with the second partition plate; wherein, when the second flow disturbing component comprises the plurality of third protruding portions, the plurality of third protruding portions are arranged in a spaced manner along the flow direction of the refrigerant in the third cavity portion; when the second flow disturbing component comprises the plurality of fourth protruding portions, the plurality of fourth protruding portions are arranged in a spaced manner along the flow direction of the refrigerant in the third cavity portion; and when the second flow disturbing component comprises the plurality of third protruding portions and the plurality of fourth protruding portions, the plurality of third protruding portions and the plurality of fourth protruding portions are arranged in a staggered and spaced manner along the flow direction of the refrigerant in the third cavity portion, so as to form a zigzag second channel between the plurality of third protruding portions and the plurality of fourth protruding portions.

[0017] Further, each third protruding portion is in a strip-shaped structure; along the extension direction of each third protruding portion, each third protruding portion comprises a fifth protruding segment and a sixth protruding segment connected with each other, the fifth protruding segment and the sixth protruding segment of each third protruding portion are arranged in a third included angle, the lifting direction of the third included angle of each third protruding portion is the same as the direction from the first end to the second end of the third accommodating cavity or the flow direction of the refrigerant in the third cavity portion; and / or each fourth protruding portion is in a strip-shaped structure; along the extension direction of each fourth protruding portion, each fourth protruding portion comprises a seventh protruding segment and an eighth protruding segment connected with each other, the seventh protruding segment and the eighth protruding segment of each fourth protruding portion are arranged in a fourth included angle, the lifting direction of the fourth included angle of each fourth protruding portion is the same as the direction from the first end to the second end of the third accommodating cavity or the flow direction of the refrigerant in the third cavity portion.

[0018] The battery box body comprises a box body assembly and two partition plates, the box body assembly has an internal cavity, the two partition plates are arranged in the internal cavity in a depth direction of the internal cavity, and the internal cavity is divided into three independent cavity parts, the three cavity parts are a first containing cavity, a second containing cavity and a third containing cavity arranged in sequence, the first containing cavity is used for filling cooling liquid and placing a battery pack, so that the battery pack is immersed in the cooling liquid in the first containing cavity, the box body assembly is provided with a first liquid inlet, a second liquid inlet, a first liquid outlet and a second liquid outlet, the first liquid inlet and the first liquid outlet are communicated with the first containing cavity, the second liquid inlet and the second liquid outlet are communicated with the second containing cavity, the first liquid inlet and the second liquid outlet are communicated, so that the cooling liquid in the second containing cavity enters the first containing cavity, the second liquid inlet and the first liquid outlet are communicated, so that the cooling liquid in the first containing cavity enters the second containing cavity, and the third containing cavity is used for filling refrigerant, and the heat of the cooling liquid in the second containing cavity is absorbed by heat exchange between the refrigerant in the third containing cavity and the cooling liquid in the second containing cavity.

[0019] The battery box body of the application can achieve good cooling effect on the whole battery pack by immersing the battery pack in the cooling liquid in the first containing cavity, and can avoid the temperature difference of each battery of the battery pack, and solve the problem that the battery heat dissipation mode in the prior art causes the temperature difference of the battery module itself. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the application form a part thereof, serve to provide further understanding of the application, and together with the specification explain the application, and do not constitute an improper limitation on the application. In the drawings:

[0021] Figure 1 An exploded structural view of the battery box body according to the application is shown;

[0022] Figure 2 An exploded structural view of the battery box body according to the application is shown;

[0023] Figure 3 A flow direction of the cooling liquid and a flow direction of the refrigerant in the battery box body according to the application are shown;

[0024] Figure 4 A side view of the external structure of the battery box body according to the application is shown;

[0025] Figure 5 A top view of the battery pack arranged in the first containing cavity of the battery box body according to the application is shown;

[0026] Figure 6 A top view of the first side wall and the plurality of partition plates of the battery box body according to the application is shown;

[0027] Figure 7 A side view of a first side panel of the battery case according to the present application is shown;

[0028] Figure 8 A longitudinal sectional view of the battery case in Figure 4 is shown;

[0029] Figure 9 A partial enlarged view of the battery case in Figure 8 is shown;

[0030] Figure 10 An enlarged view at A of the battery case in Figure 8 is shown;

[0031] Figure 11 A longitudinal sectional view of the first side panel of the battery case in Figure 7 is shown; wherein a first partition panel is arranged inside the first side panel;

[0032] Figure 12 An enlarged view at B of the first partition panel of the battery case in Figure 11 is shown;

[0033] Figure 13 A structural schematic view of the second accommodating cavity of the battery case according to the present application is shown; wherein a bottom view of a plurality of first protrusions of a first turbulence component in each second cavity portion is shown;

[0034] Figure 14 A structural schematic view of the first panel side of the second partition panel of the battery case according to the present application is shown; wherein a top view of a plurality of second protrusions of each first turbulence component for cooperating with the plurality of first protrusions in Figure 13 is shown;

[0035] Figure 15 A structural schematic view of an adjacent one first protrusion and one second protrusion in each first turbulence component of the battery case according to the present application is shown;

[0036] Figure 16 A structural schematic view of the third accommodating cavity of the battery case according to the present application is shown; wherein a top view of a plurality of fourth protrusions of a second turbulence component in each third cavity portion is shown;

[0037] Figure 17 A structural schematic view of the second panel side of the second partition panel of the battery case according to the present application is shown; wherein a bottom view of a plurality of third protrusions of each second turbulence component for cooperating with the plurality of fourth protrusions in Figure 16 is shown;

[0038] Figure 18 A structural schematic view of a fourth protruding part and a third protruding part of adjacent one of each second turbulence part of the battery box according to the present application is shown;

[0039] Figure 19 A structural schematic view of a bottom plate and a partition of the battery box according to the present application is shown;

[0040] Figure 20 A side view of a second partition plate of the battery box according to the present application is shown;

[0041] Figure 21 A structural schematic view of Figure 20 An enlarged view of C of the second partition plate of the battery box in

[0042] Figure 22 A structural schematic view of Figure 1 a first side plate of the battery box in another perspective view and a second plate surface side of the second partition plate.

[0043] In the above drawings, the following reference signs are used:

[0044] 10, first side plate; 101, first liquid inlet; 102, second liquid inlet; 103, first liquid outlet; 104, second liquid outlet; 11, bottom plate; 111, refrigerant inlet; 112, refrigerant outlet; 113, groove; 12, cover plate; 13, baffle plate; 131, communication opening; 132, first baffle plate; 133, last baffle plate; 134, intermediate baffle plate;

[0045] 20, partition plate; 21, first partition plate; 22, second partition plate;

[0046] 31, first accommodating cavity; 311, first cavity part; 32, second accommodating cavity; 321, second cavity part; 322, fourth cavity part; 323, fifth cavity part; 33, third accommodating cavity; 331, third cavity part; 332, sixth cavity part; 333, seventh cavity part;

[0047] 41, partition part; 411, first opening; 42, partition; 421, second opening;

[0048] 50, first turbulence part; 51, first protruding part; 511, first protruding section; 512, second protruding section; 52, second protruding part; 521, third protruding section; 522, fourth protruding section; 53, first channel;

[0049] 60, second turbulence part; 61, third protruding part; 611, fifth protruding section; 612, sixth protruding section; 62, fourth protruding part; 621, seventh protruding section; 622, eighth protruding section; 63, second channel;

[0050] 200, battery pack; 210, battery. DETAILED DESCRIPTION

[0051] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0052] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs.

[0053] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation, device, component and / or combinations thereof.

[0054] The present application provides a battery box, please refer to Figures 1 to 22 The battery box comprises a box assembly and two partition plates 20, the box assembly has an internal cavity; the two partition plates 20 are arranged in the internal cavity in the depth direction of the internal cavity to divide the internal cavity into three independent cavity parts; the three cavity parts are a first containing cavity 31, a second containing cavity 32 and a third containing cavity 33 arranged in sequence; wherein the first containing cavity 31 is used to fill cooling liquid and is used to place a battery pack 200, so that the battery pack 200 is immersed in the cooling liquid in the first containing cavity 31; the box assembly is provided with a first liquid inlet 101, a second liquid inlet 102, a first liquid outlet 103 and a second liquid outlet 104, the first liquid inlet 101 and the first liquid outlet 103 are both communicated with the first containing cavity 31, the second liquid inlet 102 and the second liquid outlet 104 are both communicated with the second containing cavity 32; the first liquid inlet 101 and the second liquid outlet 104 are communicated to make the cooling liquid in the second containing cavity 32 enter the first containing cavity 31; the second liquid inlet 102 and the first liquid outlet 103 are communicated to make the cooling liquid in the first containing cavity 31 enter the second containing cavity 32; the third containing cavity 33 is used to fill refrigerant, and the refrigerant in the third containing cavity 33 exchanges heat with the cooling liquid in the second containing cavity 32 to make the refrigerant in the third containing cavity 33 absorb the heat of the cooling liquid in the second containing cavity 32.

[0055] In the implementation process, the refrigerant in the third accommodating cavity 33 absorbs the heat of the cooling liquid in the second accommodating cavity 32 to cool the cooling liquid in the second accommodating cavity 32; the cooled cooling liquid in the second accommodating cavity 32 enters the first accommodating cavity 31, and the cooling liquid in the first accommodating cavity 31 cools the battery pack 200 immersed therein, that is, the battery pack 200 is in contact with the cooling liquid in the first accommodating cavity 31, so that the cooling liquid in the first accommodating cavity 31 absorbs the heat generated by the battery pack 200, thereby directly cooling the battery pack 200; the cooling liquid in the first accommodating cavity 31 after cooling the battery pack 200 enters the second accommodating cavity 32, that is, the first accommodating cavity 31 and the second accommodating cavity 32 form a cooling liquid circulation through the first liquid inlet 101, the second liquid inlet 102, the first liquid outlet 103 and the second liquid outlet 104, to ensure the cooling effect of the cooling liquid on the battery pack 200.

[0056] The battery box of the present application can achieve better cooling effect on the whole battery pack 200 by immersing the battery pack 200 in the cooling liquid in the first accommodating cavity 31, thereby making the heat dissipation of the battery pack 200 more efficient and avoiding the problem of temperature difference existing in each battery of the battery pack 200, solving the problem that the battery heat dissipation mode in the prior art causes temperature difference existing in the battery module itself, thereby being beneficial to prolonging the service life of the battery pack 200 and improving its use performance.

[0057] Specifically, the cooling liquid in the present application is an insulating fluid.

[0058] Specifically, the cooling liquid in the present application has a large specific heat capacity to have a good heat exchange effect.

[0059] Optionally, the refrigerant in the present application is provided by a vehicle-mounted air conditioning system.

[0060] Optionally, the refrigerant in the present application undergoes phase change after absorbing the heat of the cooling liquid in the second accommodating cavity 32.

[0061] In the embodiment, the battery box further comprises one or more baffles 13. When the baffle 13 is one, the baffle 13 is arranged in the first accommodating cavity 31 to divide the first accommodating cavity 31 into two first cavity portions 311 arranged along the first direction; the baffle 13 is provided with a communication opening 131 to communicate the two first cavity portions 311. When the baffle 13 is multiple, the multiple baffles 13 are arranged in the first accommodating cavity 31 along the first direction to divide the first accommodating cavity 31 into multiple first cavity portions 311, and the multiple first cavity portions 311 are arranged in sequence along the first direction; each baffle 13 is provided with a communication opening 131 to communicate the two first cavity portions 311 on both sides of the baffle 13.

[0062] The battery pack 200 comprises a plurality of battery units, each of which comprises a plurality of batteries 210; a plurality of first cavity portions 311 are arranged in one-to-one correspondence with the plurality of battery units, and the plurality of batteries 210 of each battery unit are arranged in the corresponding first cavity portion 311.

[0063] Optionally, the first accommodating cavity 31 has a cuboid structure, and the first direction is a width direction or a length direction of the first accommodating cavity 31.

[0064] Optionally, the plurality of baffles 13 are uniformly distributed along the first direction.

[0065] In the embodiment, each of the one or more baffles 13 is a strip-shaped plate, and the extension direction of each baffle 13 is perpendicular to the first direction; along the extension direction of each baffle 13, each baffle 13 has oppositely arranged first and second ends. When the baffle 13 is one, one end of the baffle 13 is provided with a communication opening 131. When the baffle 13 is a plurality, the first ends to the second ends of the plurality of baffles 13 are all in the same direction; along the first direction, the two adjacent baffles 13 are respectively a first baffle and a second baffle, the first end of the first baffle is provided with a communication opening 131, and the second end of the second baffle is provided with a communication opening 131.

[0066] Specifically, in the arrangement sequence along the first direction, the first cavity portion 311 located at the first sequence in the plurality of first cavity portions 311 is a first first cavity portion, and the first cavity portion 311 located at the last sequence in the plurality of first cavity portions 311 is a last first cavity portion; the first liquid inlet 101 communicates with the first first cavity portion, and the first liquid outlet 103 communicates with the last first cavity portion.

[0067] When the baffle 13 is one, the first accommodating cavity 31 comprises two first cavity portions 311, and the two first cavity portions 311 are respectively the first first cavity portion and the last first cavity portion, that is, the first liquid inlet 101 and the first liquid outlet 103 respectively communicate with the two first cavity portions 311.

[0068] Specifically, when the baffle 13 is a plurality, in the arrangement sequence along the first direction, the baffle 13 located at the first sequence in the plurality of baffles 13 is a first baffle 132, the baffle 13 located at the last sequence in the plurality of baffles 13 is a last baffle 133, the baffle 13 located at the odd sequence in the plurality of baffles 13 is an odd baffle, and the baffle 13 located at the even sequence in the plurality of baffles 13 is an even baffle; wherein the first baffle 132 is necessarily an odd baffle. The direction from the first baffle 132 to the last baffle 133 is the same as the direction from the first first cavity portion to the last first cavity portion.

[0069] Specifically, the first first cavity and the last first cavity are both strip-shaped cavities, the extension direction of the first first cavity is parallel to the extension direction of each baffle 13, and the extension direction of the last first cavity is parallel to the extension direction of each baffle 13; along the extension direction of the first first cavity, the first first cavity has a first end and a second end arranged oppositely; along the extension direction of the last first cavity, the last first cavity has a first end and a second end arranged oppositely; the direction from the first end to the second end of the first first cavity is the same as the direction from the first end to the second end of the last first cavity, and the direction from the first end to the second end of the first first cavity is the same as the direction from the first end to the second end of each baffle 13.

[0070] Specifically, the first end of the single baffle is provided with a communication opening 131, and the second end of the double baffle is provided with a communication opening 131. The first end of the first baffle 132 is provided with a communication opening 131, and the first liquid inlet 101 is in communication with the second end of the first first cavity. When the last baffle 133 is a single baffle, the first end of the last baffle 133 is provided with a communication opening 131, and the first liquid outlet 103 is in communication with the second end of the last first cavity; when the last baffle 133 is a double baffle, the second end of the last baffle 133 is provided with a communication opening 131, and the first liquid outlet 103 is in communication with the first end of the last first cavity.

[0071] Specifically, each first cavity 311 is a strip-shaped cavity, and the extension direction of each first cavity 311 is parallel to the extension direction of each baffle 13; along the extension direction of each first cavity 311, each first cavity 311 has a first end and a second end arranged oppositely; the direction from the first end to the second end of each first cavity 311 is the same as the direction from the first end to the second end of each baffle 13.

[0072] Optionally, the number of the plurality of baffles 13 is odd, so that the first liquid inlet 101 and the first liquid outlet 103 are located on the same side of the first containing cavity 31.

[0073] As Figure 2 , Figure 3 and Figure 5As shown, the baffles 13 are three, and the three baffles 13 are sequentially a first baffle 132, a middle baffle 134 and a last baffle 133; the first cavity portions 311 are four, and the four first cavity portions 311 are sequentially a first first cavity portion, a first middle cavity portion, a second middle cavity portion and a last first cavity portion. The cooling liquid entering the first first cavity portion from the first liquid inlet 101 flows from the second end of the first first cavity portion to the first end thereof; then enters the first middle cavity portion through the communication opening 131 of the first end of the first baffle 132, and the cooling liquid entering the first middle cavity portion flows from the first end of the first middle cavity portion to the second end thereof; then enters the second middle cavity portion through the communication opening 131 of the second end of the middle baffle 134, and the cooling liquid entering the second middle cavity portion flows from the second end of the second middle cavity portion to the first end thereof; then enters the last first cavity portion through the communication opening 131 of the first end of the last baffle 133, and the cooling liquid entering the last first cavity portion flows from the first end of the last first cavity portion to the second end thereof, and then flows out from the first liquid outlet 103.

[0074] Specifically, when the baffles 13 are one, the first end of the baffle 13 is provided with the communication opening 131, the first liquid inlet 101 is communicated with the second end of one of the two first cavity portions 311, and the first liquid outlet 103 is communicated with the second end of the other first cavity portion 311.

[0075] In the embodiment, when the baffles 13 are one, one end of the baffle 13 is spaced apart from the cavity wall of the first containing cavity 31, so that the spacing space between the one end of the baffle 13 and the cavity wall of the first containing cavity 31 forms the communication opening 131. Alternatively, the first end of the baffle 13 is spaced apart from the cavity wall of the first containing cavity 31, so that the spacing space between the first end of the baffle 13 and the cavity wall of the first containing cavity 31 forms the communication opening 131.

[0076] In the embodiment, when the baffles 13 are multiple, the first end of the first baffle is spaced apart from the cavity wall of the first containing cavity 31, so that the spacing space between the first end of the first baffle and the cavity wall of the first containing cavity 31 forms the communication opening 131; and the second end of the second baffle is spaced apart from the cavity wall of the first containing cavity 31, so that the spacing space between the second end of the second baffle and the cavity wall of the first containing cavity 31 forms the communication opening 131.

[0077] In the embodiment, the first liquid inlet 101 and the second liquid outlet 104 are communicated through a first pipeline; the second liquid inlet 102 and the first liquid outlet 103 are communicated through a second pipeline; and a power pump is arranged on the first pipeline and / or the second pipeline to provide power for the circulation of the cooling liquid.

[0078] In the embodiment, the second accommodating cavity 32 is located between the two partition plates 20, which are the first partition plate 21 and the second partition plate 22.

[0079] In the embodiment, the first arrangement form of the second accommodating cavity 32 is that the second accommodating cavity 32 has oppositely arranged first and second ends, and the second liquid inlet 102 and the second liquid outlet 104 are respectively communicated with the first and second ends of the second accommodating cavity 32. The battery box further comprises a first flow disturbing component 50 arranged in the second accommodating cavity 32, and the first flow disturbing component 50 comprises a plurality of first protruding parts 51 and / or a plurality of second protruding parts 52. Each first protruding part 51 protrudes from the surface of the first partition plate 21 towards the second partition plate 22, that is, the surface of the first partition plate 21 facing the second partition plate 22 is the first surface of the first partition plate 21, and each first protruding part 51 protrudes from the first surface of the first partition plate 21 towards the second partition plate 22. The protruding end surface of each first protruding part 51 is spaced apart from the second partition plate 22. Each second protruding part 52 protrudes from the surface of the second partition plate 22 towards the first partition plate 21, that is, the surface of the second partition plate 22 facing the first partition plate 21 is the first surface of the second partition plate 22, and each second protruding part 52 protrudes from the first surface of the second partition plate 22 towards the first partition plate 21. The protruding end surface of each second protruding part 52 is spaced apart from the first partition plate 21.

[0080] When the first flow disturbing component 50 only comprises a plurality of first protruding parts 51, the plurality of first protruding parts 51 are spaced apart along the distribution direction of the first and second ends of the second accommodating cavity 32 to disturb the flow of the cooling liquid in the second accommodating cavity 32, thereby enhancing the heat exchange effect between the cooling liquid in the second accommodating cavity 32 and the refrigerant in the third accommodating cavity 33.

[0081] When the first flow disturbing component 50 comprises a plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the distribution direction of the first and second ends of the second accommodating cavity 32 to disturb the flow of the cooling liquid in the second accommodating cavity 32, thereby enhancing the heat exchange effect between the cooling liquid in the second accommodating cavity 32 and the refrigerant in the third accommodating cavity 33.

[0082] When the first flow disturbing component 50 comprises a plurality of first protruding parts 51 and a plurality of second protruding parts 52, the plurality of first protruding parts 51 and the plurality of second protruding parts 52 are sequentially staggered and spaced apart along the distribution direction of the first and second ends of the second accommodating cavity 32 to form a zigzag first channel 53 between the plurality of first protruding parts 51 and the plurality of second protruding parts 52, so as to disturb the cooling liquid and increase the flow time of the cooling liquid in the second accommodating cavity 32, thereby enhancing the heat exchange effect between the cooling liquid in the second accommodating cavity 32 and the refrigerant in the third accommodating cavity 33.

[0083] Optionally, the first protrusions 51 are uniformly distributed along the distribution direction of the first end and the second end of the second accommodating cavity 32, and the second protrusions 52 are uniformly distributed along the distribution direction of the first end and the second end of the second accommodating cavity 32.

[0084] In the embodiment, the second accommodating cavity 32 has a second arrangement form. The battery box further comprises one or more partition portions 41. When the partition portion 41 is one, the partition portion 41 is arranged in the second accommodating cavity 32 to divide the second accommodating cavity 32 into two second cavity portions 321 arranged along the second direction. The first opening 411 is arranged on the partition portion 41 to communicate the two second cavity portions 321. When the partition portion 41 is multiple, the multiple partition portions 41 are arranged in the second accommodating cavity 32 along the second direction to divide the second accommodating cavity 32 into multiple second cavity portions 321 arranged along the second direction. The first opening 411 is arranged on each partition portion 41 to communicate the two second cavity portions 321 on both sides of the partition portion 41. Optionally, the partition portion 41 has a plate structure.

[0085] Specifically, the second accommodating cavity 32 has a cuboid structure, and the second direction is the width direction or the length direction of the second accommodating cavity 32.

[0086] Optionally, the second direction is parallel to the first direction.

[0087] Optionally, the multiple partition portions 41 are uniformly distributed along the second direction.

[0088] Specifically, each second cavity portion 321 has a strip-shaped cavity, and the extension direction of each second cavity portion 321 is perpendicular to the second direction. Each second cavity portion 321 has a first end and a second end arranged oppositely along the extension direction of the second cavity portion 321. The first end and the second end of the multiple second cavity portions 321 have the same direction. Each partition portion 41 has a strip-shaped structure, and the extension direction of each partition portion 41 is parallel to the extension direction of each second cavity portion 321. Each partition portion 41 has a first end and a second end arranged oppositely along the extension direction of the partition portion 41. The first end and the second end of each partition portion 41 have the same direction as the first end and the second end of each second cavity portion 321. When the partition portion 41 is multiple, the first end and the second end of the multiple partition portions 41 have the same direction.

[0089] Specifically, along the second direction, two adjacent partition portions 41 are a first partition portion and a second partition portion respectively. The first end of the first partition portion is provided with the first opening 411, and the second end of the second partition portion is provided with the first opening 411.

[0090] Specifically, in the arrangement order along the second direction, the second cavity 321 at the first order is the first second cavity, and the second cavity 321 at the last order is the last second cavity; the second liquid inlet 102 is in communication with the first second cavity, and the second liquid outlet 104 is in communication with the last second cavity.

[0091] When the partition 41 is one, the second accommodating cavity 32 includes two second cavities 321, which are the first second cavity and the last second cavity respectively, that is, the second liquid inlet 102 and the second liquid outlet 104 are in communication with the two second cavities 321 respectively.

[0092] When the partition 41 is multiple, in the arrangement order along the second direction, the partition 41 at the first order is the first partition, the partition 41 at the last order is the last partition, the partition 41 at the odd order is the odd partition, and the partition 41 at the even order is the even partition; wherein, the first partition is necessarily the odd partition. The direction from the first partition to the last partition is the same as the direction from the first second cavity to the last second cavity.

[0093] Specifically, the first end of the odd partition is provided with the first opening 411, and the second end of the even partition is provided with the first opening 411. The first end of the first partition is provided with the first opening 411, and the second liquid inlet 102 is in communication with the second end of the first second cavity. When the last partition is the odd partition, the first end of the last partition is provided with the first opening 411, and the second liquid outlet 104 is in communication with the second end of the last second cavity; when the last partition is the even partition, the second end of the last partition is provided with the first opening 411, and the second liquid outlet 104 is in communication with the first end of the last second cavity.

[0094] As shown in Figure 13 and Figure 22 , the partition 41 is one, the first opening 411 is arranged at the first end of the partition 41, the second liquid inlet 102 is in communication with the second end of one second cavity 321, and the second liquid outlet 104 is in communication with the second end of another second cavity 321. The two second cavities 321 are the fourth cavity 322 and the fifth cavity 323 respectively, the second liquid inlet 102 is in communication with the second end of the fourth cavity 322, and the second liquid outlet 104 is in communication with the second end of the fifth cavity 323; the cooling liquid entering the fourth cavity 322 from the second liquid inlet 102 flows in the fourth cavity 322 from the second end of the fourth cavity 322 to the first end thereof, and then enters the fifth cavity 323 through the first opening 411; the cooling liquid entering the fifth cavity 323 flows from the first end of the fifth cavity 323 to the second end thereof, and then flows out from the second liquid outlet 104.

[0095] Specifically, when the partitioning part 41 is one, one end of the partitioning part 41 is spaced apart from the cavity wall of the second accommodating cavity 32, so that the spacing space between the one end of the partitioning part 41 and the cavity wall of the second accommodating cavity 32 forms the first opening 411. Alternatively, the first end of the partitioning part 41 is spaced apart from the cavity wall of the second accommodating cavity 32, so that the spacing space between the first end of the partitioning part 41 and the cavity wall of the second accommodating cavity 32 forms the first opening 411.

[0096] When the partitioning part 41 is multiple, the first end of the first partitioning part is spaced apart from the cavity wall of the second accommodating cavity 32, so that the spacing space between the first end of the first partitioning part and the cavity wall of the second accommodating cavity 32 forms the first opening 411; the second end of the second partitioning part is spaced apart from the cavity wall of the second accommodating cavity 32, so that the spacing space between the second end of the second partitioning part and the cavity wall of the second accommodating cavity 32 forms the first opening 411.

[0097] Alternatively, the direction from the first end to the second end of each second cavity part 321 is the same as the direction from the first end to the second end of each first cavity part 311, so that the first liquid inlet 101, the second liquid inlet 102, the first liquid outlet 103 and the second liquid outlet 104 are all located on the same side of the box assembly, facilitating the communication between the first liquid inlet 101 and the second liquid outlet 104, and the communication between the second liquid inlet 102 and the first liquid outlet 103.

[0098] In the embodiment, the battery box further comprises a plurality of first flow disturbing parts 50, which are arranged in the plurality of second cavity parts 321 one by one.

[0099] The specific structure of each first flow disturbing part 50 is as follows: the first flow disturbing part 50 comprises a plurality of first protruding parts 51 and / or a plurality of second protruding parts 52; each first protruding part 51 protrudes from the plate surface of the first partition plate 21 towards the second partition plate 22, that is, the plate surface of the first partition plate 21 facing the second partition plate 22 is the first plate surface of the first partition plate 21, and each first protruding part 51 protrudes from the first plate surface of the first partition plate 21 towards the second partition plate 22; the protruding end surface of each first protruding part 51 is spaced apart from the second partition plate 22; each second protruding part 52 protrudes from the plate surface of the second partition plate 22 towards the first partition plate 21, that is, the plate surface of the second partition plate 22 facing the first partition plate 21 is the first plate surface of the second partition plate 22, and each second protruding part 52 protrudes from the first plate surface of the second partition plate 22 towards the first partition plate 21; the protruding end surface of each second protruding part 52 is spaced apart from the first partition plate 21.

[0100] When the first flow disturbing component 50 only includes the plurality of first protruding parts 51, the plurality of first protruding parts 51 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of first protruding parts 51 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 6, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33. Figure 13 When the first flow disturbing component 50 only includes the plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of second protruding parts 52 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 7, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33.

[0101] When the first flow disturbing component 50 only includes the plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of second protruding parts 52 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 7, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33. Figure 13 When the first flow disturbing component 50 only includes the plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of second protruding parts 52 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 7, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33.

[0102] When the first flow disturbing component 50 only includes the plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of second protruding parts 52 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 7, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33. Figure 13 When the first flow disturbing component 50 only includes the plurality of second protruding parts 52, the plurality of second protruding parts 52 are spaced apart along the flow direction of the cooling liquid in the second cavity 321 in which the plurality of second protruding parts 52 are located, and the flow direction of the cooling liquid in the second cavity 321 is the arrow direction in each of the second cavities 321 in FIG. 7, so as to disturb the cooling liquid flowing in the second cavity 321, thereby enhancing the heat exchange effect between the cooling liquid in the second cavity 321 and the refrigerant in the third containing cavity 33.

[0103] Optionally, in each first flow disturbing component 50, the plurality of first protruding parts 51 are uniformly distributed along the extension direction of the second cavity 321, and the plurality of second protruding parts 52 are uniformly distributed along the extension direction of the second cavity 321.

[0104] In the embodiment, each first protruding part 51 is in a strip structure, and the extending direction of each first protruding part 51 is perpendicular to the protruding direction thereof; along the extending direction of each first protruding part 51, each first protruding part 51 comprises a first protruding section 511 and a second protruding section 512 connected to each other, and the first protruding section 511 and the second protruding section 512 of each first protruding part 51 are arranged at a first included angle. When the second accommodating cavity 32 is in the first arrangement form, the lifting direction of the first included angle of each first protruding part 51 is the same as the direction from the first end to the second end of the second accommodating cavity 32, and at this time, the cooling liquid in the second accommodating cavity 32 flows from the first end to the second end. When the second accommodating cavity 32 is in the second arrangement form, the lifting direction of the first included angle of each first protruding part 51 is the same as the flow direction of the cooling liquid in the second cavity part 321 where the first protruding part 51 is located, and the flow direction of the cooling liquid in the second cavity part 321 here refers to the arrow direction in each second cavity part 321 in FIG. 3. Figure 13

[0105] In the embodiment, each second protruding part 52 is in a strip structure, and the extending direction of each second protruding part 52 is perpendicular to the protruding direction thereof; along the extending direction of each second protruding part 52, each second protruding part 52 comprises a third protruding section 521 and a fourth protruding section 522 connected to each other, and the third protruding section 521 and the fourth protruding section 522 of each second protruding part 52 are arranged at a second included angle. When the second accommodating cavity 32 is in the first arrangement form, the lifting direction of the second included angle of each second protruding part 52 is the same as the direction from the first end to the second end of the second accommodating cavity 32, and at this time, the cooling liquid in the second accommodating cavity 32 flows from the first end to the second end. When the second accommodating cavity 32 is in the second arrangement form, the lifting direction of the second included angle of each second protruding part 52 is the same as the flow direction of the cooling liquid in the second cavity part 321 where the second protruding part 52 is located, and the flow direction of the cooling liquid in the second cavity part 321 here refers to the arrow direction in each second cavity part 321 in FIG. 3. Figure 13

[0106] Optionally, when the second accommodating cavity 32 is in the first arrangement form, the two ends of each first protruding part 51 are fixedly connected to the cavity wall of the second accommodating cavity 32, and the two ends of each second protruding part 52 are fixedly connected to the cavity wall of the second accommodating cavity 32. When the second accommodating cavity 32 is in the second arrangement form, in the first second cavity part and the last second cavity part, the two ends of each first protruding part 51 are fixedly connected to the cavity wall of the second cavity part 321 and the spacing part 41 respectively, and the two ends of each second protruding part 52 are fixedly connected to the cavity wall of the second cavity part 321 and the spacing part 41 respectively; in each second cavity part 321 except the first second cavity part and the last second cavity part, the two ends of each first protruding part 51 are fixedly connected to two spacing parts 41 respectively, and the two ends of each second protruding part 52 are fixedly connected to two spacing parts 41 respectively.​​

[0107] Specifically, in each first protruding part 51, the two ends of the first protruding section 511 are a first end and a second end respectively, the two ends of the second protruding section 512 are a first end and a second end respectively, and the first end of the first protruding section 511 is connected with the first end of the second protruding section 512. In each second protruding part 52, the two ends of the third protruding section 521 are a first end and a second end respectively, the two ends of the fourth protruding section 522 are a first end and a second end respectively, and the first end of the third protruding section 521 is connected with the first end of the fourth protruding section 522. In the fourth cavity part 322, along the flow direction of the cooling liquid in the fourth cavity part 322, the first end of the first protruding section 511 is located on the side of the second end of the first protruding section 511 away from the second end of the fourth cavity part 322, the first end of the second protruding section 512 is located on the side of the second end of the second protruding section 512 away from the second end of the fourth cavity part 322, the first end of the third protruding section 521 is located on the side of the second end of the third protruding section 521 away from the second end of the fourth cavity part 322, and the first end of the fourth protruding section 522 is located on the side of the second end of the fourth protruding section 522 away from the second end of the fourth cavity part 322, where the flow direction of the cooling liquid in the fourth cavity part 322 refers to the arrow direction in the fourth cavity part 322 in FIG. 3. In the fifth cavity part 323, along the flow direction of the cooling liquid in the fifth cavity part 323, the first end of the first protruding section 511 is located on the side of the second end of the first protruding section 511 close to the second end of the fifth cavity part 323, the first end of the second protruding section 512 is located on the side of the second end of the second protruding section 512 close to the second end of the fifth cavity part 323, the first end of the third protruding section 521 is located on the side of the second end of the third protruding section 521 close to the second end of the fifth cavity part 323, and the first end of the fourth protruding section 522 is located on the side of the second end of the fourth protruding section 522 close to the second end of the fifth cavity part 323, where the flow direction of the cooling liquid in the fifth cavity part 323 refers to the arrow direction in the fifth cavity part 323 in FIG. 3. Figure 13 Figure 13

[0108] Optionally, in each first spoiler part 50, the first included angles of the plurality of first protruding parts 51 are equal, the second included angles of the plurality of second protruding parts 52 are equal, and the first included angles of the plurality of first protruding parts 51 are equal to the second included angles of the plurality of second protruding parts 52.

[0109] Optionally, in each first spoiler part 50, along the extension direction of the second cavity part 321, the spacing between adjacent two first protruding parts 51 is 8mm to 12mm, and the spacing between adjacent two second protruding parts 52 is 8mm to 12mm.

[0110] Optionally, in each first spoiler part 50, the protruding height of each first protruding part 51 is 6mm, and the protruding height of each second protruding part 52 is 6mm.

[0111] ​​Optionally, in each first spoiler part 50, the maximum vertical length of each first protrusion part 51 is 7mm to 8mm along the extending direction of the second cavity part 321, and the maximum vertical length of each second protrusion part 52 is 7mm to 8mm; that is, the vertical length direction of the first protrusion part 51 is the same as or parallel to the extending direction of the third cavity part 331, and the vertical length direction of the second protrusion part 52 is the same as or parallel to the extending direction of the third cavity part 331.

[0112] In the embodiment, the box assembly is provided with a refrigerant inlet 111 and a refrigerant outlet 112, both of which are in communication with the third containing cavity 33, so that the refrigerant enters the third containing cavity 33 through the refrigerant inlet 111, and the refrigerant in the third containing cavity 33 is discharged through the refrigerant outlet 112. The two partition plates 20 are respectively a first partition plate 21 and a second partition plate 22, the first partition plate 21 is used to enclose the first containing cavity 31, and the second partition plate 22 is used to enclose the third containing cavity 33; the third containing cavity 33 is located between the second partition plate 22 and the bottom wall of the internal cavity of the box assembly.

[0113] In the embodiment, the first type of the third containing cavity 33 is that the third containing cavity 33 has oppositely arranged first and second ends, and the refrigerant inlet 111 and the refrigerant outlet 112 are in communication with the first and second ends of the third containing cavity 33, respectively; the battery box further comprises a second spoiler part 60 arranged in the third containing cavity 33, the second spoiler part 60 comprises a plurality of third protrusion parts 61 and / or a plurality of fourth protrusion parts 62; each third protrusion part 61 protrudes from the surface of the second partition plate 22 towards the bottom wall of the internal cavity of the box assembly, that is, the surface of the second partition plate 22 facing the bottom wall of the internal cavity of the box assembly is the second surface of the second partition plate 22, and each third protrusion part 61 protrudes from the second surface of the second partition plate 22 towards the bottom wall of the internal cavity of the box assembly; the protruding end surface of each third protrusion part 61 is spaced apart from the bottom wall of the internal cavity of the box assembly; each fourth protrusion part 62 protrudes from the bottom wall of the internal cavity of the box assembly towards the second partition plate 22; the protruding end surface of each fourth protrusion part 62 is spaced apart from the second partition plate 22.

[0114] When the second spoiler part 60 only comprises a plurality of third protrusion parts 61, the plurality of third protrusion parts 61 are spaced apart along the distribution direction of the first and second ends of the third containing cavity 33, so as to disturb the refrigerant flowing in the third containing cavity 33, thereby enhancing the heat exchange effect of the refrigerant in the third containing cavity 33 and the cooling liquid in the second containing cavity 32.

[0115] When the second turbulence component 60 only includes the plurality of fourth protruding parts 62, the plurality of fourth protruding parts 62 are arranged in an interval along the distribution direction of the first end and the second end of the third accommodating cavity 33, so as to disturb the refrigerant flowing in the third accommodating cavity 33, and further enhance the heat exchange effect between the refrigerant in the third accommodating cavity 33 and the cooling liquid in the second accommodating cavity 32.

[0116] When the second turbulence component 60 includes the plurality of third protruding parts 61 and the plurality of fourth protruding parts 62, the plurality of third protruding parts 61 and the plurality of fourth protruding parts 62 are arranged in an interval along the distribution direction of the first end and the second end of the third accommodating cavity 33, and are staggered in sequence, so as to form a zigzag second channel 63 between the plurality of third protruding parts 61 and the plurality of fourth protruding parts 62, so as to disturb the refrigerant and increase the flow time of the refrigerant in the third accommodating cavity 33, and further enhance the heat exchange effect between the refrigerant in the third accommodating cavity 33 and the cooling liquid in the second cavity 321.

[0117] Optionally, along the distribution direction of the first end and the second end of the third accommodating cavity 33, the plurality of fourth protruding parts 62 are uniformly distributed, and the plurality of third protruding parts 61 are uniformly distributed.

[0118] In the embodiment, the second arrangement form of the third accommodating cavity 33 is that the battery box further includes one or more division parts 42. When the division part 42 is one, the division part 42 is arranged in the third accommodating cavity 33, so as to divide the third accommodating cavity 33 into two third cavity parts 331 distributed along the third direction; the second opening 421 is arranged on the division part 42, so as to communicate the two third cavity parts 331 through the second opening 421. When the division part 42 is a plurality, the plurality of division parts 42 are arranged in an interval along the third direction in the third accommodating cavity 33, so as to divide the third accommodating cavity 33 into a plurality of third cavity parts 331, and the plurality of third cavity parts 331 are arranged in sequence along the third direction; the second opening 421 is arranged on each division part 42, so as to communicate the two third cavity parts 331 on both sides of the division part 42. Optionally, the division part 42 is a plate structure.

[0119] Specifically, the third accommodating cavity 33 is a cuboid structure, and the third direction is the width direction or the length direction of the third accommodating cavity 33.

[0120] Optionally, the third direction is parallel to the first direction.

[0121] Optionally, the plurality of division parts 42 are uniformly distributed along the third direction.

[0122] Specifically, each third cavity portion 331 is a strip-shaped cavity, and the extension direction of each third cavity portion 331 is perpendicular to the third direction; along the extension direction of each third cavity portion 331, each third cavity portion 331 has oppositely arranged first and second ends; the orientations of the first ends to the second ends of the plurality of third cavity portions 331 are the same. Each division portion 42 in the one or more division portions 42 is a strip-shaped structure, and the extension direction of each division portion 42 is parallel to the extension direction of each third cavity portion 331; along the extension direction of each division portion 42, each division portion 42 has oppositely arranged first and second ends; the orientations of the first ends to the second ends of each division portion 42 are the same as the orientations of the first ends to the second ends of each third cavity portion 331; when the division portions 42 are a plurality, the orientations of the first ends to the second ends of the plurality of division portions 42 are the same.

[0123] Specifically, along the third direction, the two adjacent division portions 42 are a first division portion and a second division portion, respectively, the first end of the first division portion is provided with a second opening 421, and the second end of the second division portion is provided with a second opening 421.

[0124] Specifically, along the arrangement order in the third direction, the third cavity portion 331 located at the first order in the plurality of third cavity portions 331 is a first third cavity portion, and the third cavity portion 331 located at the last order in the plurality of third cavity portions 331 is a last third cavity portion; the refrigerant inlet 111 communicates with the first third cavity portion, and the refrigerant outlet 112 communicates with the last third cavity portion.

[0125] When the division portion 42 is one, the third containing cavity 33 includes two third cavity portions 331, and the two third cavity portions 331 are a first third cavity portion and a last third cavity portion, respectively, that is, the refrigerant inlet 111 and the refrigerant outlet 112 respectively communicate with the two third cavity portions 331.

[0126] When the division portion 42 is a plurality, along the arrangement order in the third direction, the division portion 42 located at the first order in the plurality of division portions 42 is a first division portion, the division portion 42 located at the last order in the plurality of division portions 42 is a last division portion, the division portion 42 located at an odd order in the plurality of division portions 42 is an odd division portion, and the division portion 42 located at an even order in the plurality of division portions 42 is an even division portion; wherein the first division portion is necessarily an odd division portion. The direction from the first division portion to the last division portion is the same as the direction from the first third cavity portion to the last third cavity portion.

[0127] Specifically, the first end of the odd-numbered division section is provided with a second opening 421, and the second end of the even-numbered division section is provided with a second opening 421. The first end of the first division section is provided with a second opening 421, and the refrigerant inlet 111 is connected to the second end of the first third cavity section. When the last division section is an odd-numbered division section, the first end of the last division section is provided with a second opening 421, and the refrigerant outlet 112 is connected to the second end of the last third cavity section; when the last division section is an even-numbered division section, the second end of the last division section is provided with a second opening 421, and the refrigerant outlet 112 is connected to the first end of the last third cavity section.

[0128] like Figure 16 As shown, there is one dividing section 42, and a second opening 421 is provided at the first end of the dividing section 42. The refrigerant inlet 111 is connected to the second end of one third cavity 331, and the refrigerant outlet 112 is connected to the second end of another third cavity 331. The two third cavities 331 are the sixth cavity 332 and the seventh cavity 333, respectively. The refrigerant inlet 111 is connected to the second end of the sixth cavity 332, and the refrigerant outlet 112 is connected to the second end of the seventh cavity 333. The refrigerant entering the sixth cavity 332 from the refrigerant inlet 111 flows from the second end of the sixth cavity 332 to its first end, and then enters the seventh cavity 333 through the second opening 421. The refrigerant entering the seventh cavity 333 flows from the first end of the seventh cavity 333 to its second end, and then flows out from the refrigerant outlet 112.

[0129] Specifically, when there is only one dividing part 42, one end of the dividing part 42 is spaced apart from the cavity wall of the third receiving cavity 33 so that the space between the one end of the dividing part 42 and the cavity wall of the third receiving cavity 33 forms a second opening 421; optionally, the first end of the dividing part 42 is spaced apart from the cavity wall of the third receiving cavity 33 so that the space between the first end of the dividing part 42 and the cavity wall of the third receiving cavity 33 forms a second opening 421.

[0130] When there are multiple dividing sections 42, the first end of the first dividing section is spaced apart from the cavity wall of the third receiving cavity 33 so that the space between the first end of the first dividing section and the cavity wall of the third receiving cavity 33 forms a second opening 421; the second end of the second dividing section is spaced apart from the cavity wall of the third receiving cavity 33 so that the space between the second end of the second dividing section and the cavity wall of the third receiving cavity 33 forms a second opening 421.

[0131] Optionally, the first end to the second end of each third cavity 331 is oriented in the same direction as the first end to the second end of each first cavity 311, so that the first liquid inlet 101, the second liquid inlet 102, the first liquid outlet 103, the second liquid outlet 104, the refrigerant inlet 111, and the refrigerant outlet 112 are all located on the same side of the cabinet assembly.

[0132] In the present embodiment, the battery cabinet further comprises a plurality of second turbulence components 60, which are arranged in the plurality of third cavities 331 one by one.

[0133] For the specific structure of each second turbulence component 60: the second turbulence component 60 comprises a plurality of third protrusions 61 and / or a plurality of fourth protrusions 62; each third protrusion 61 protrudes from the plate surface of the second partition plate 22 towards the bottom wall of the internal cavity of the cabinet assembly, that is, the plate surface of the second partition plate 22 facing the bottom wall of the internal cavity of the cabinet assembly is the second plate surface of the second partition plate 22, and each third protrusion 61 protrudes from the second plate surface of the second partition plate 22 towards the bottom wall of the internal cavity of the cabinet assembly; the protruding end surface of each third protrusion 61 is spaced apart from the bottom wall of the internal cavity of the cabinet assembly; each fourth protrusion 62 protrudes from the bottom wall of the internal cavity of the cabinet assembly towards the second partition plate 22; and the protruding end surface of each fourth protrusion 62 is spaced apart from the second partition plate 22.

[0134] When the second turbulence component 60 only comprises a plurality of third protrusions 61, the plurality of third protrusions 61 are spaced apart along the flow direction of the refrigerant in the third cavity 331 in which they are located, where the flow direction of the refrigerant in the third cavity 331 refers to the arrow direction in each third cavity 331 in Figure 16 , so as to disturb the refrigerant flowing in the third cavity 331, thereby enhancing the heat exchange effect between the refrigerant in the third containing cavity 33 and the cooling liquid in the second containing cavity 32.

[0135] When the second turbulence component 60 only comprises a plurality of fourth protrusions 62, the plurality of fourth protrusions 62 are spaced apart along the flow direction of the refrigerant in the third cavity 331 in which they are located, where the flow direction of the refrigerant in the third cavity 331 refers to the arrow direction in each third cavity 331 in Figure 16 , so as to disturb the refrigerant flowing in the third cavity 331, thereby enhancing the heat exchange effect between the refrigerant in the third containing cavity 33 and the cooling liquid in the second containing cavity 32.

[0136] When the second turbulence component 60 comprises a plurality of third protrusions 61 and a plurality of fourth protrusions 62, the plurality of third protrusions 61 and the plurality of fourth protrusions 62 are spaced apart along the flow direction of the refrigerant in the third cavity 331 in which they are located, where the flow direction of the refrigerant in the third cavity 331 refers to the arrow direction in each third cavity 331 inFigure 16 The third protruding portions 61 and the fourth protruding portions 62 are arranged alternately and spacedly in the third cavity 331, so as to form a zigzag second channel 63 between the third protruding portions 61 and the fourth protruding portions 62, and to make the refrigerant in the third cavity 331 pass through the zigzag second channel 63, so as to disturb the refrigerant and increase the flow time of the refrigerant in the third cavity 331, and to enhance the heat exchange effect between the refrigerant in the third cavity 33 and the cooling liquid in the second cavity 321.

[0137] Optionally, in each second spoiler component 60, the third protruding portions 61 are uniformly distributed along the extending direction of the third cavity 331, and the fourth protruding portions 62 are uniformly distributed along the extending direction of the third cavity 331.

[0138] In the embodiment, each third protruding portion 61 is in a strip structure, and the extending direction of each third protruding portion 61 is perpendicular to the protruding direction of each third protruding portion 61. Along the extending direction of each third protruding portion 61, each third protruding portion 61 comprises a fifth protruding segment 611 and a sixth protruding segment 612 connected with each other, and the fifth protruding segment 611 and the sixth protruding segment 612 of each third protruding portion 61 are arranged at a third included angle. When the third accommodating cavity 33 is in the first arrangement form, the lifting direction of the third included angle of each third protruding portion 61 is the same as the direction from the first end to the second end of the third accommodating cavity 33, and at this time, the refrigerant in the third accommodating cavity 33 flows from the first end to the second end. When the third accommodating cavity 33 is in the second arrangement form, the lifting direction of the third included angle of each third protruding portion 61 is the same as the flow direction of the refrigerant in the third cavity 331 in which each third protruding portion 61 is arranged. Here, the flow direction of the refrigerant in the third cavity 331 refers to the arrow direction in each third cavity 331. Figure 16

[0139] In the embodiment, each fourth protruding portion 62 is in a strip structure, and the extending direction of each fourth protruding portion 62 is perpendicular to the protruding direction of each fourth protruding portion 62. Along the extending direction of each fourth protruding portion 62, each fourth protruding portion 62 comprises a seventh protruding segment 621 and an eighth protruding segment 622 connected with each other, and the seventh protruding segment 621 and the eighth protruding segment 622 of each fourth protruding portion 62 are arranged at a fourth included angle. When the third accommodating cavity 33 is in the first arrangement form, the lifting direction of the fourth included angle of each fourth protruding portion 62 is the same as the direction from the first end to the second end of the third accommodating cavity 33, and at this time, the refrigerant in the third accommodating cavity 33 flows from the first end to the second end. When the third accommodating cavity 33 is in the second arrangement form, the lifting direction of the fourth included angle of each fourth protruding portion 62 is the same as the flow direction of the refrigerant in the third cavity 331 in which each fourth protruding portion 62 is arranged. Here, the flow direction of the refrigerant in the third cavity 331 refers to the arrow direction in each third cavity 331. Figure 16

[0140] ​​Optionally, when the third receiving cavity 33 is in the first configuration, both ends of each third protrusion 61 are fixedly connected to the cavity wall of the third receiving cavity 33, and both ends of each fourth protrusion 62 are fixedly connected to the cavity wall of the third receiving cavity 33. When the third receiving cavity 33 is in the second configuration, in the first and last third cavities, both ends of each third protrusion 61 are fixedly connected to the cavity walls of the dividing portion 42 and the third cavity 331, respectively, and both ends of each fourth protrusion 62 are fixedly connected to the cavity walls of the dividing portion 42 and the third cavity 331, respectively; in the remaining third cavities 331 excluding the first and last third cavities, both ends of each third protrusion 61 are fixedly connected to the two dividing portions 42, respectively, and both ends of each fourth protrusion 62 are fixedly connected to the two dividing portions 42, respectively.

[0141] Specifically, in each of the third protrusions 61, the two ends of the fifth protrusion 611 are the first end and the second end, respectively; the two ends of the sixth protrusion 612 are the first end and the second end, respectively; and the first end of the fifth protrusion 611 is connected to the first end of the sixth protrusion 612. In each of the fourth protrusions 62, the two ends of the seventh protrusion 621 are the first end and the second end, respectively; the two ends of the eighth protrusion 622 are the first end and the second end, respectively; and the first end of the seventh protrusion 621 is connected to the first end of the eighth protrusion 622. In the sixth cavity 332, along the refrigerant flow direction within the sixth cavity 332, the first end of the fifth protrusion 611 is located on the side of its second end away from the second end of the sixth cavity 332; the first end of the sixth protrusion 612 is located on the side of its second end away from the second end of the sixth cavity 332; the first end of the seventh protrusion 621 is located on the side of its second end away from the second end of the sixth cavity 332; and the first end of the eighth protrusion 622 is located on the side of its second end away from the second end of the sixth cavity 332. Here, the refrigerant flow direction within the sixth cavity 332 refers to… Figure 16 The arrow points in the direction of the sixth cavity 332. In the seventh cavity 333, along the refrigerant flow direction, the first end of the fifth protrusion 611 is located on the side of its second end near the second end of the seventh cavity 333; the first end of the sixth protrusion 612 is located on the side of its second end near the second end of the seventh cavity 333; the first end of the seventh protrusion 621 is located on the side of its second end near the second end of the seventh cavity 333; and the first end of the eighth protrusion 622 is located on the side of its second end near the second end of the seventh cavity 333. Here, the refrigerant flow direction within the seventh cavity 333 refers to… Figure 16 Figure 16 The arrow direction within the seventh cavity 333.

[0142] Optionally, in each second spoiler part 60, the third included angles of the plurality of third protrusions 61 are equal, the fourth included angles of the plurality of fourth protrusions 62 are equal, and the first included angles of the plurality of third protrusions 61 and the second included angles of the plurality of fourth protrusions 62 are equal.

[0143] Optionally, in each second spoiler part 60, the spacing between two adjacent third protrusions 61 along the extension direction of the third cavity part 331 is 8-12 mm, and the spacing between two adjacent fourth protrusions 62 is 8-12 mm.

[0144] Optionally, in each second spoiler part 60, the protrusion height of each third protrusion 61 is 6 mm, and the protrusion height of each fourth protrusion 62 is 6 mm.

[0145] Optionally, in each second spoiler part 60, the maximum vertical length of each third protrusion 61 along the extension direction of the third cavity part 331 is 7-8 mm, and the maximum vertical length of each fourth protrusion 62 is 7-8 mm; that is, the vertical length direction of the third protrusion 61 is the same as or parallel to the extension direction of the third cavity part 331, and the vertical length direction of the fourth protrusion 62 is the same as or parallel to the extension direction of the third cavity part 331.

[0146] Optionally, the second direction and the third direction are parallel, and the orientations of the fourth cavity part 322 to the fifth cavity part 323 are the same as or opposite to the orientations of the sixth cavity part 332 to the seventh cavity part 333.

[0147] In the embodiment, the box assembly includes a first side wall 10, a second side wall, a bottom plate 11, and a cover plate 12, the second side wall is arranged on the bottom plate 11, and a second partition plate 22 is arranged on the second side wall to jointly form a third accommodating cavity 33 with the second partition plate 22 and the bottom plate 11; the plate surface of the bottom plate 11 facing the second partition plate 22 is the bottom wall of the internal cavity of the box assembly; a first partition plate 21 is arranged in the space formed by the first side wall 10 to jointly form a second accommodating cavity 32 with the first side wall 10 and the second partition plate 22, and jointly form a first accommodating cavity 31 with the first side wall 10; the cover plate 12 is arranged on the first side wall 10 in a foldable manner to close the first accommodating cavity 31; when the cover plate 12 is arranged on the first side wall 10, the cover plate 12, the first partition plate 21, and the first side wall 10 jointly form the first accommodating cavity 31.

[0148] Or, the second side plate is not arranged, the plate surface of the second partition plate 22 and the plate surface of the bottom plate 11 are attached, the plate surface of the bottom plate 11 towards the second partition plate 22 is provided with a groove 113, and the bottom wall of the groove 113 forms the bottom wall of the internal cavity of the box assembly, and the groove cavity of the groove 113 is the third containing cavity 33.

[0149] Specifically, the first liquid inlet 101, the second liquid inlet 102, the first liquid outlet 103 and the second liquid outlet 104 are arranged on the first side plate 10.

[0150] Specifically, the refrigerant inlet 111 and the refrigerant outlet 112 are arranged on the bottom plate 11.

[0151] Optionally, the first partition plate 21 and the first side plate 10 are in an integrated structure.

[0152] Optionally, the first side plate 10 and the plurality of barrier plates 13 are in an integrated structure.

[0153] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0154] In the battery box provided by the present application, the battery box comprises a box assembly and two partition plates 20, the box assembly has an internal cavity; the two partition plates 20 are arranged in the internal cavity along the depth direction of the internal cavity to divide the internal cavity into three independent cavity parts; the three cavity parts are a first containing cavity 31, a second containing cavity 32 and a third containing cavity 33 arranged in sequence; the first containing cavity 31 is used for filling cooling liquid and placing a battery pack 200, so that the battery pack 200 is immersed in the cooling liquid in the first containing cavity 31; the box assembly is provided with a first liquid inlet 101, a second liquid inlet 102, a first liquid outlet 103 and a second liquid outlet 104, the first liquid inlet 101 and the first liquid outlet 103 are both in communication with the first containing cavity 31, the second liquid inlet 102 and the second liquid outlet 104 are both in communication with the second containing cavity 32; the first liquid inlet 101 and the second liquid outlet 104 are in communication to make the cooling liquid in the second containing cavity 32 enter the first containing cavity 31; the second liquid inlet 102 and the first liquid outlet 103 are in communication to make the cooling liquid in the first containing cavity 31 enter the second containing cavity 32; the third containing cavity 33 is used for filling refrigerant, and the refrigerant in the third containing cavity 33 exchanges heat with the cooling liquid in the second containing cavity 32 to make the refrigerant in the third containing cavity 33 absorb the heat of the cooling liquid in the second containing cavity 32.

[0155] The battery box of the present application can achieve better cooling effect on the whole battery pack 200 by immersing the battery pack 200 in the cooling liquid in the first accommodating cavity 31, avoiding the problem of temperature difference existing in each battery of the battery pack 200 itself, and solving the problem that the existing battery cooling mode can cause temperature difference existing in the battery module itself.

[0156] In addition, the battery box of the present application integrates the heat exchange module into the battery box, so that the structure of the whole battery cooling system is relatively compact and occupies small space.

[0157] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0158] For ease of description, spatial relative terms such as "over", "above", "upper surface", "upper", etc. can be used herein to describe the spatial positional relationship of one device or feature with respect to 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 of the devices as described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0159] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery case characterized by comprising: The battery box comprises: a box assembly having an internal cavity; two partition plates (20) are arranged in the internal cavity in a depth direction of the internal cavity to divide the internal cavity into three independent cavity parts, which are a first containing cavity (31), a second containing cavity (32) and a third containing cavity (33) arranged in sequence; the first containing cavity (31) is used for filling cooling liquid and placing a battery pack (200), so that the battery pack (200) is immersed in the cooling liquid in the first containing cavity (31); the box assembly is provided with a first liquid inlet (101), a second liquid inlet (102), a first liquid outlet (103) and a second liquid outlet (104), the first liquid inlet (101) and the first liquid outlet (103) are communicated with the first containing cavity (31), the second liquid inlet (102) and the second liquid outlet (104) are communicated with the second containing cavity (32); the first liquid inlet (101) and the second liquid outlet (104) are communicated to make the cooling liquid in the second containing cavity (32) enter the first containing cavity (31); the second liquid inlet (102) and the first liquid outlet (103) are communicated to make the cooling liquid in the first containing cavity (31) enter the second containing cavity (32); the third containing cavity (33) is used for filling refrigerant, and the heat of the cooling liquid in the second containing cavity (32) is absorbed by making the refrigerant in the third containing cavity (33) exchange heat with the cooling liquid in the second containing cavity (32).

2. The battery pack of claim 1, wherein The battery box further comprises: one or a plurality of baffle plates (13) arranged in a first direction, one or more baffle plates (13) are arranged in the first containing cavity (31) to divide the first containing cavity (31) into a plurality of first cavity parts (311) arranged in the first direction in sequence; each baffle plate (13) is provided with a communication opening (131) to communicate two first cavity parts (311) on both sides of the baffle plate (13); the battery pack (200) comprises a plurality of battery units, each battery unit comprises a plurality of batteries (210); a plurality of first cavity parts (311) are arranged one by one corresponding to a plurality of battery units, and a plurality of batteries (210) of each battery unit are arranged in the corresponding first cavity part (311).

3. The battery pack of claim 2, wherein, Each baffle plate (13) is a strip-shaped plate, and the extension direction of each baffle plate (13) is perpendicular to the first direction; each baffle plate (13) has a first end and a second end arranged oppositely in the extension direction of the baffle plate (13); when the baffle plate (13) is one, the baffle plate (13) is provided with the communication opening (131) at one end; When the plurality of baffles (13) are provided, two adjacent baffles (13) are respectively a first baffle and a second baffle along the first direction, the first end of the first baffle is provided with the communication opening (131), and the second end of the second baffle is provided with the communication opening (131).

4. The battery pack of claim 2, wherein The first cavity (311) located at the first sequence among the plurality of first cavities (311) is a first cavity (311) located at the head sequence, and the first cavity (311) located at the last sequence among the plurality of first cavities (311) is a first cavity (311) located at the tail sequence along the arrangement sequence in the first direction; the first liquid inlet (101) is in communication with the first cavity (311) located at the head sequence, and the first liquid outlet (103) is in communication with the first cavity (311) located at the tail sequence.

5. The battery case according to claim 3, wherein When the baffle (13) is one, one end of the baffle (13) is spaced apart from the cavity wall of the first containing cavity (31) to form the communication opening (131) between the one end of the baffle (13) and the cavity wall of the first containing cavity (31); When the plurality of baffles (13) are provided, the first end of the first baffle is spaced apart from the cavity wall of the first containing cavity (31) to form the communication opening (131) between the first end of the first baffle and the cavity wall of the first containing cavity (31); and / or the second end of the second baffle is spaced apart from the cavity wall of the first containing cavity (31) to form the communication opening (131) between the second end of the second baffle and the cavity wall of the first containing cavity (31).

6. The battery pack of claim 1, wherein, The second containing cavity (32) has a first end and a second end arranged oppositely, the second liquid inlet (102) and the second liquid outlet (104) are in communication with the first end and the second end of the second containing cavity (32) respectively; the two partition plates (20) are respectively a first partition plate (21) and a second partition plate (22); the battery case further comprises a first flow disturbing component (50) arranged in the second containing cavity (32), the first flow disturbing component (50) comprises: a plurality of first protrusions (51), each first protrusion (51) protrudes from the surface of the first partition plate (21) towards the second partition plate (22); the protruding end surface of each first protrusion (51) is spaced apart from the second partition plate (22); and / or a plurality of second protrusions (52), each second protrusion (52) protrudes from the surface of the second partition plate (22) towards the first partition plate (21); the protruding end surface of each second protrusion (52) is spaced apart from the first partition plate (21); When the first flow disturbing component (50) comprises a plurality of first protrusions (51), the plurality of first protrusions (51) are spaced apart along the distribution direction of the first end and the second end of the second containing cavity (32). When the first flow disturbing component (50) comprises a plurality of the second protruding portions (52), the plurality of the second protruding portions (52) are arranged in an interval along the distribution direction of the first end and the second end of the second accommodating cavity (32); When the first flow disturbing component (50) comprises a plurality of the first protruding portions (51) and a plurality of the second protruding portions (52), the plurality of the first protruding portions (51) and the plurality of the second protruding portions (52) are arranged in an interval and staggered in sequence along the distribution direction of the first end and the second end of the second accommodating cavity (32), so as to form a zigzag first channel (53) between the plurality of the first protruding portions (51) and the plurality of the second protruding portions (52).

7. The battery pack of claim 1, wherein, The battery box further comprises: one or a plurality of partition portions (41) arranged in an interval along the second direction, one or more of the partition portions (41) are arranged in the second accommodating cavity (32) to divide the second accommodating cavity (32) into a plurality of second cavity portions (321) arranged in sequence along the second direction; each of the partition portions (41) is provided with a first opening (411) to communicate two of the second cavity portions (321) on both sides of the partition portion (41).

8. The battery pack of claim 7, wherein, The battery box further comprises a plurality of first flow disturbing components (50), the plurality of the first flow disturbing components (50) are arranged in the plurality of the second cavity portions (321) in a one-to-one correspondence; the two partition plates (20) are respectively a first partition plate (21) and a second partition plate (22); the first flow disturbing component (50) comprises: a plurality of first protruding portions (51), each of the first protruding portions (51) protrudes from the surface of the first partition plate (21) towards the second partition plate (22); the protruding end surface of each of the first protruding portions (51) is arranged in an interval with the second partition plate (22); and / or a plurality of second protruding portions (52), each of the second protruding portions (52) protrudes from the surface of the second partition plate (22) towards the first partition plate (21); the protruding end surface of each of the second protruding portions (52) is arranged in an interval with the first partition plate (21); When the first flow disturbing component (50) comprises a plurality of the first protruding portions (51), the plurality of the first protruding portions (51) are arranged in an interval along the flow direction of the cooling liquid in the second cavity portion (321); When the first flow disturbing component (50) comprises a plurality of the second protruding portions (52), the plurality of the second protruding portions (52) are arranged in an interval along the flow direction of the cooling liquid in the second cavity portion (321); When the first flow disturbing component (50) comprises a plurality of the first protruding portions (51) and a plurality of the second protruding portions (52), the plurality of the first protruding portions (51) and the plurality of the second protruding portions (52) are arranged in an interval and staggered in sequence along the flow direction of the cooling liquid in the second cavity portion (321), so as to form a zigzag first channel (53) between the plurality of the first protruding portions (51) and the plurality of the second protruding portions (52).

9. The battery box according to claim 6 or 8, wherein, Each of the first protruding portions (51) is in a strip-shaped structure; along the extending direction of each of the first protruding portions (51), each of the first protruding portions (51) comprises a first protruding segment (511) and a second protruding segment (512) connected with each other, the first protruding segment (511) and the second protruding segment (512) of each of the first protruding portions (51) are arranged at a first included angle, and the lifting direction of the first included angle of each of the first protruding portions (51) is the same as the flowing direction of the cooling liquid; and / or Each of the second protruding portions (52) is in a strip-shaped structure; along the extending direction of each of the second protruding portions (52), each of the second protruding portions (52) comprises a third protruding segment (521) and a fourth protruding segment (522) connected with each other, the third protruding segment (521) and the fourth protruding segment (522) of each of the second protruding portions (52) are arranged at a second included angle, and the lifting direction of the second included angle of each of the second protruding portions (52) is the same as the flowing direction of the cooling liquid.

10. The battery pack of claim 1, wherein, The two partition plates (20) are respectively a first partition plate (21) and a second partition plate (22), the third containing cavity (33) is located between the second partition plate (22) and the bottom wall of the internal cavity of the box assembly; the box assembly is provided with a refrigerant inlet (111) and a refrigerant outlet (112); the third containing cavity (33) has oppositely arranged first and second ends, and the refrigerant inlet (111) and the refrigerant outlet (112) are in communication with the first and second ends of the third containing cavity (33) respectively; the battery box further comprises a second flow disturbing component (60) arranged in the third containing cavity (33), and the second flow disturbing component (60) comprises: a plurality of third protruding portions (61), each of the third protruding portions (61) protrudes from the surface of the second partition plate (22) toward the bottom wall of the internal cavity; the protruding end surface of each of the third protruding portions (61) is arranged in a spaced manner with the bottom wall of the internal cavity; and / or a plurality of fourth protruding portions (62), each of the fourth protruding portions (62) protrudes from the bottom wall of the internal cavity toward the second partition plate (22); the protruding end surface of each of the fourth protruding portions (62) is arranged in a spaced manner with the second partition plate (22); When the second flow disturbing component (60) comprises a plurality of third protruding portions (61), the plurality of third protruding portions (61) are arranged in a spaced manner along the distribution direction of the first and second ends of the third containing cavity (33); When the second flow disturbing component (60) comprises a plurality of fourth protruding portions (62), the plurality of fourth protruding portions (62) are arranged in a spaced manner along the distribution direction of the first and second ends of the third containing cavity (33); When the second flow disturbing component (60) comprises a plurality of third protrusions (61) and a plurality of fourth protrusions (62), the plurality of third protrusions (61) and the plurality of fourth protrusions (62) are arranged in sequence and alternately staggered along the distribution direction of the first end and the second end of the third accommodating cavity (33), so as to form a zigzag second channel (63) between the plurality of third protrusions (61) and the plurality of fourth protrusions (62).

11. The battery pack of claim 1, wherein, The battery box further comprises: one or a plurality of division parts (42) arranged in the third direction, one or more division parts (42) arranged in the third accommodating cavity (33) to divide the third accommodating cavity (33) into a plurality of third cavity parts (331) arranged in sequence along the third direction; each division part (42) is provided with a second opening (421) to communicate two third cavity parts (331) on both sides of the division part (42); Wherein, the box assembly is provided with a refrigerant inlet (111) and a refrigerant outlet (112), and the refrigerant inlet (111) and the refrigerant outlet (112) are communicated with the third accommodating cavity (33).

12. The battery pack of claim 11, wherein, The two division plates (20) are respectively a first division plate (21) and a second division plate (22), and the third accommodating cavity (33) is located between the second division plate (22) and the bottom wall of the internal cavity of the box assembly; the battery box further comprises a plurality of second flow disturbing components (60), and the plurality of second flow disturbing components (60) are arranged one by one in the plurality of third cavity parts (331); the second flow disturbing component (60) comprises: a plurality of third protrusions (61), each third protrusion (61) protruding from the surface of the second division plate (22) towards the bottom wall of the internal cavity; the protruding end surface of each third protrusion (61) is arranged in the internal cavity; and / or a plurality of fourth protrusions (62), each fourth protrusion (62) protruding from the bottom wall of the internal cavity towards the second division plate (22); the protruding end surface of each fourth protrusion (62) is arranged in the second division plate (22); When the second flow disturbing component (60) comprises a plurality of third protrusions (61), the plurality of third protrusions (61) are arranged in sequence along the flow direction of the refrigerant in the third cavity part (331); When the second flow disturbing component (60) comprises a plurality of fourth protrusions (62), the plurality of fourth protrusions (62) are arranged in sequence along the flow direction of the refrigerant in the third cavity part (331); When the second spoiler component (60) comprises a plurality of third protrusions (61) and a plurality of fourth protrusions (62), the plurality of third protrusions (61) and the plurality of fourth protrusions (62) are arranged in sequence and alternately spaced along the flow direction of the refrigerant in the third cavity (331), so as to form a zigzag second channel (63) between the plurality of third protrusions (61) and the plurality of fourth protrusions (62).

13. The battery case according to claim 10 or 12, wherein Each third protrusion (61) is in a strip structure; along the extension direction of each third protrusion (61), each third protrusion (61) comprises a fifth protrusion segment (611) and a sixth protrusion segment (612) connected with each other, the fifth protrusion segment (611) and the sixth protrusion segment (612) of each third protrusion (61) are arranged at a third included angle, and the lifting direction of the third included angle of each third protrusion (61) is the same as the flow direction of the refrigerant; and / or Each fourth protrusion (62) is in a strip structure; along the extension direction of each fourth protrusion (62), each fourth protrusion (62) comprises a seventh protrusion segment (621) and an eighth protrusion segment (622) connected with each other, the seventh protrusion segment (621) and the eighth protrusion segment (622) of each fourth protrusion (62) are arranged at a fourth included angle, and the lifting direction of the fourth included angle of each fourth protrusion (62) is the same as the flow direction of the refrigerant.

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