Battery box body

Abstract

The utility model discloses a battery box body, which comprises an enclosure frame assembly, a battery box body, a battery box body, a battery box body, a battery box body, a battery box body and a battery box body, and is characterized in that the enclosure frame assembly comprises a bottom plate and an enclosure frame arranged along the periphery of the bottom plate; the cross beam assembly is arranged in the first inner cavity and divides the first inner cavity into a plurality of first sub-cavities; and the cooling system comprises a first cooling unit arranged at the cross beam assembly and a second cooling unit arranged at the bottom plate. According to the battery box body disclosed by the utility model, the assembly of the cross beam is more convenient and faster, the assembly time is saved, and the strength of the cross beam assembly is enhanced. The cross beam can play an original supporting and reinforcing role, circulation of a cooling liquid medium is achieved by modifying the internal structure of the cross beam, the cooling medium is conveyed into the cross beam through the first cooling unit, full-area flowing of the cooling medium from top to bottom is achieved through the specific internal structure of the cross beam, the heat exchange efficiency of the battery is improved, and the service life of the battery is prolonged. And the uniformity and comprehensiveness of battery heat exchange are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, especially a battery box. BACKGROUND

[0002] As a key component of the power battery system of new energy vehicles, the battery box is mainly used for bearing, fixing and protecting the battery cell and module, and ensuring the safety and endurance of the battery system. It is not only the physical carrier of the battery system, but also bears multiple functions such as thermal management, electrical connection, waterproof and dustproof. Thermal management is an important part of the battery box design, which needs to ensure the uniformity of the battery system heat dissipation, the efficiency of the thermal management system, etc. to ensure the performance and life of the battery.

[0003] The existing cooling structure is mostly a water cooling structure arranged at the bottom of the battery box. The water cooling structure directly contacts the bottom of the battery module and cools the battery module through heat exchange. However, this cooling method has a significant problem: it causes a temperature difference between the top and bottom of the battery module along its thickness direction, which affects the service life and performance of the battery module, reduces the usability of the battery pack, and increases the risk of battery thermal runaway. SUMMARY

[0004] In view of the above problems of the prior art, the technical problem to be solved by the utility model is to provide a battery box which improves the heat exchange uniformity and efficiency.

[0005] To solve the above technical problems, one technical scheme of the utility model is to provide a battery box, which comprises:

[0006] a frame assembly comprising a bottom plate and a frame arranged along the periphery of the bottom plate, the frame and the bottom plate forming a first inner cavity;

[0007] a beam assembly arranged in the first inner cavity and dividing it into a plurality of first sub-cavities; and

[0008] a cooling system comprising a first cooling unit arranged at the beam assembly and a second cooling unit arranged at the bottom plate.

[0009] Further, the beam assembly comprises at least one beam having a second inner cavity, which is provided with an inlet and an outlet; the first cooling unit comprises a cooling medium, which enters the second inner cavity through the inlet and flows out through the outlet.

[0010] Further, the beam further has a sub-beam arranged in the second inner cavity and dividing it into a plurality of second sub-cavities, and the cooling medium flows through all the second sub-cavities and then flows out from the outlet.

[0011] Further, the sub-beams are arranged along the length direction of the cross beam in the second inner cavity, and the sub-beams divide the second inner cavity into a plurality of second sub-cavities arranged along the height direction of the second inner cavity; and the sub-beams are provided with flow-through openings for the cooling medium to flow from one second sub-cavity to another second sub-cavity.

[0012] Further, the inlet and the outlet are arranged at the end of the cross beam, and the inlet is closer to the upper side of the cross beam, and the outlet is closer to the lower side of the cross beam.

[0013] Further, the first cooling unit further comprises an input main pipe and an output main pipe; the input end of the input main pipe is connected to a cooling source, and the output end is connected to the inlet; the input end of the output main pipe is connected to the outlet, and the output end is connected to a refrigeration device which cools the medium from the output main pipe to serve as the cooling source.

[0014] Further, the first cooling unit further comprises an input branch pipe connected to the input main pipe, an input joint connected between the input branch pipe and the inlet, an output branch pipe connected to the output main pipe, and an output joint connected between the output branch pipe and the outlet.

[0015] Further, one end of each of the input joint and the output joint is fixedly connected to the cross beam, and the other end is detachably and airtightly connected to the corresponding branch pipe.

[0016] Further, the end of the cross beam is provided with a sealing block for sealing the second inner cavity, the sealing block has an embedded part embedded in the second inner cavity and an abutting part abutting against the end face of the cross beam, and a welding seam is formed between the abutting face of the abutting part and the end face of the cross beam.

[0017] The inlet and the outlet are arranged on the sealing block, the outer end penetrates through the outer side face of the sealing block outwardly, the inner end penetrates through the inner side face of the sealing block inwardly, the height of the inlet is adapted to the height of the second sub-cavity on the upper side of the cross beam, and the height of the outlet is adapted to the height of the second sub-cavity on the lower side of the cross beam.

[0018] Further, the cross beam assembly further comprises:

[0019] a first reinforcing beam connected to one end of the cross beam and fixed to the inner wall of the surrounding frame;

[0020] a second reinforcing beam connected to the other end of the cross beam and fixed to the other inner wall of the surrounding frame.

[0021] Compared with the prior art, the battery box has the following beneficial effects: (1) the battery box is divided into a frame assembly and a beam assembly, two assemblies are assembled respectively, and then the two assemblies are assembled into the battery box, compared with the traditional mode that each beam needs to be assembled with the frame, the assembly mode of the beam and the reinforcing beam is not limited by the angle between the frame and the bottom plate, the assembly of the beam is more convenient and fast, the assembly time is saved, and the strength of the beam assembly is also strengthened; (2) the beam can not only play the original supporting and strengthening role, but also realize circulation of the cooling medium by structural modification of the inside of the beam, the cooling medium is delivered to the inside of the beam through the first cooling unit, the cooling medium flows in the whole area from top to bottom through the special structure in the inside of the beam, and the two sides of the battery pack are uniformly heat-exchanged from top to bottom; (3) the liquid inlet and the liquid outlet are arranged at one end of the beam, during machining, the liquid inlet and the liquid outlet can be simultaneously machined and formed after one-time clamping and fixing, the parts need not be clamped and fixed in multiple directions for multiple times, the manufacturing difficulty is reduced; and the liquid inlet main pipe and the liquid outlet main pipe can be arranged on the same side, the liquid inlet main pipe and the liquid outlet main pipe are conveniently assembled at one time, the assembly space of the liquid inlet main pipe and the liquid outlet main pipe is reduced, the assembly structure needs not to be designed for the liquid inlet main pipe and the liquid outlet main pipe respectively, the number of parts is reduced, the assembly complexity is reduced, and the manufacturing cost is further saved; (4) the distribution position of the beam in the inside of the beam and the ingenious distribution of the flow guide members such as the flow port guide the cooling medium to one outlet on the same side, through the design of the beam in the utility model, only one inlet and one outlet need to be designed to realize circulation of the cooling medium; multiple inlets and multiple outlets need not to be designed, and the probability of leakage of the cooling medium is reduced; (5) the original second cooling unit of the bottom plate realizes heat dissipation of the battery in the upward, downward and lateral directions, the heat exchange efficiency of the battery is improved, and the uniformity and comprehensiveness of heat exchange of the battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings described herein are used to provide further understanding of the present application, constitute a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0023] Figure 1 is a structural schematic view of one embodiment of the battery box of the utility model.

[0024] Figure 2 is a structural schematic view of another view of one embodiment of the battery box of the utility model.

[0025] Figure 3It is the assembly schematic view of the crossbeam assembly and the first cooling unit in the battery box one embodiment of the utility model.

[0026] Figure 4 It is the structure schematic view of the crossbeam in the battery box one embodiment of the utility model.

[0027] Figure 5 It is the longitudinal section view of the crossbeam in the battery box one embodiment of the utility model.

[0028] Figure 6 It is the longitudinal section view of the crossbeam in the battery box one embodiment of the utility model.

[0029] Figure 7 It is the connection schematic view of the crossbeam and the first cooling unit in the battery box one embodiment of the utility model.

[0030] The description of the drawings is as follows:

[0031] frame assembly 100;Bottom plate 110;Frame 120;First inner cavity 130;First sub-cavity 131;

[0032] Crossbeam assembly 200;Crossbeam 210;Second inner cavity 201;Second sub-cavity 201a;Inlet 202;Outlet 203;Sub-beam 204;Flow port 204a;Center sub-beam 2041;Upper half sub-beam 2042;First flow gap 205;Second flow gap 206;Crossbeam body 211;Sealing block 212;Embedded part 212a;Butt joint part 212b;First reinforcing beam 220;Third inner cavity 221;Perforation 222;Second reinforcing beam 230;Connecting block 240;

[0033] First cooling unit 300;Inlet main pipe 310;Outlet main pipe 320;Inlet connector 330;Outlet connector 340;Elastic clamping part 350;Clamping block 351;Annular step surface 360. Specific embodiments

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0037] Please refer to Figure 1 , Figure 2 and Figure 3 , Figure 1 is a structural schematic diagram of an embodiment of the battery box of the present application. Figure 2 is a structural schematic diagram of another view of an embodiment of the battery box of the present application. Figure 3 is an assembly schematic diagram of the beam assembly and the first cooling unit of an embodiment of the battery box of the present application. In this text, the structures shown in Figure 1 , Figure 2 and Figure 3 are used to exemplarily describe the battery box of the present application, so as to more clearly show the various components and the cooperation relationship of the battery box. It should be understood that although this battery box shown in Figure 1 , Figure 2 and Figure 3 is described in detail as an example, this example is not intended to limit the scope of the battery box of the present application, and the components other than the components necessary for solving the technical problems of the present application can be regarded as non-essential technical elements. These non-essential technical elements can be replaced by other technical elements having the same or similar functions or structures in other embodiments, or these non-essential technical elements can not be needed in other embodiments.

[0038] As Figure 1 , Figure 2 and Figure 3As shown, the battery box comprises a frame assembly 100, a beam assembly 200 and a cooling system. The frame assembly 100 comprises a bottom plate 110 and frames 120 arranged along the periphery of the bottom plate 110, which together with the bottom plate 110 form a first half-enclosed inner cavity 130. The beam assembly 200 is arranged in the first inner cavity 130 and divides it into a plurality of first sub-cavities 131, in which battery packs (not shown) are arranged. The cooling system comprises a first cooling unit 300 arranged at the beam assembly 200 and a second cooling unit (not shown) arranged at the bottom plate 110, which is used to cool the battery packs by heat exchange with the bottom surface of the battery packs, and the first cooling unit 300 is used to cool the battery packs by heat exchange with the two side surfaces of the battery packs. The transfer direction of the cooling medium of the second cooling unit is configured to transfer from the upper side to the lower side of the beam assembly 200, so that the second cooling unit preferentially cools the side of the battery pack farthest from the first cooling unit 300, and the second cooling unit and the first cooling unit 300 cooperate to realize cooling in the upper and lower directions, thereby improving the uniformity of heat dissipation of the battery packs. The second cooling unit can adopt a known cooling structure, which can be arranged on the bottom plate 110, for example, in an S-shaped manner, a back-shaped manner, etc., between the top side plate and the bottom side plate of the bottom plate 110.

[0039] The frame assembly 100 can be configured in a rectangular box structure. For example, four frames 120 are respectively welded at the four edges of the bottom plate 110, wherein the two frames 120 welded at the two longer edges are defined as long side frames 120, and the two frames 120 welded at the two shorter edges are defined as short side frames 120. Among the two short side frames 120, one of the short side frames 120 is configured as a non-straight bent frame 120, for example, the bent frame 120 has a straight frame distributed along the width direction of the frame assembly 100, and two inclined frames connected to the two ends of the straight frame, and the other ends of the two inclined frames are respectively connected to the two long side frames 120.

[0040] The beam assembly 200 includes at least one beam 210 disposed in the first inner cavity 130, which separates the first inner cavity 130 into at least two first sub-cavities 131. The orientation, number, and distribution of the beams 210 are configured according to the orientation, number, and size of the battery pack of different embodiments. For example, the beams 210 can be configured as a plurality of beams spaced along the length direction of the battery box, each of which extends along the width direction of the battery box (i.e., the length direction of each beam 210 is consistent with the width direction of the battery box). For another example, the beams 210 can be configured as a plurality of beams spaced along the width direction of the battery box, each of which extends along the length direction of the battery box (i.e., the length direction of each beam 210 is consistent with the length direction of the battery box). In the present embodiment, eight beams 210 are spaced along the length direction of the battery box, and the eight beams 210 and the two short side frames 120 separate the first inner cavity 130 into nine first sub-cavities 131, each of which extends along the width direction of the battery box and has a width along the length direction of the battery box.

[0041] Referring to Figure 4 and Figure 5 , the beams 210 are configured as hollow beams having a hollow second inner cavity 201, and the beams 210 are provided with an inlet 202 and an outlet 203 that are in communication with the first cooling unit 300, so that the cooling medium of the first cooling unit 300 enters the second inner cavity 201 through the inlet 202 and flows out through the outlet 203. The inlet 202 and the outlet 203 can be configured at the same end of the beam 210, can be respectively configured at the two ends of the beam 210, or can be configured at the side of the beam 210. In the present embodiment, the inlet 202 and the outlet 203 are both disposed at the end of the beam 210, and the inlet 202 is closer to the upper side of the beam 210, and the outlet 203 is closer to the lower side of the beam 210.

[0042] Referring to Figure 5 and Figure 6The cross beam 210 further has a sub-beam 204 arranged in the second inner cavity 201 and separating the second inner cavity 201 into a plurality of second sub-cavities 201a, and the cooling medium flows through all the second sub-cavities 201a and then flows out from the outlet 203. The sub-beam 204 can be arranged in the second inner cavity 201 along the length direction of the cross beam 210, and the sub-beam 204 separates the second inner cavity 201 into a plurality of second sub-cavities 201a arranged along the height direction. The sub-beam 204 is provided with a flow-through opening 204a (as shown in Figure 5 The second sub-cavities 201a are arranged transversely, and the advantage is that, since the lower part of the battery pack exchanges heat with the second cooling unit at the bottom plate 110, the heat dissipation effect of the lower part of the battery pack is much better than that of the upper part of the battery pack. Therefore, the cooling medium can first enter the second sub-cavities 201a on the upper side of the cross beam 210 and then flow downward through all the second sub-cavities 201a to the bottom of the cross beam 210; the cooling medium exchanges heat with the upper part of the battery pack on the upper side of the cross beam 210 first, and then exchanges heat with the battery pack on the lower side of the cross beam 210, thereby improving the heat dissipation efficiency and uniformity of the battery pack by exchanging heat with the battery pack from the top (the first cooling unit 300 exchanges heat with the battery pack from top to bottom) and from the bottom (the second cooling unit exchanges heat with the battery pack from bottom to top).

[0043] For example, please continue to refer to Figure 5 Five sub-beams 204 can be arranged in the second inner cavity 201 of the cross beam 210, and the five sub-beams 204 are arranged in the second inner cavity 201 of the cross beam 210 along the height direction of the cross beam 210 at equal intervals, each sub-beam 204 extends along the length direction of the cross beam 210, and the two sides of each sub-beam 204 are connected with the two side walls of the second inner cavity 201, so as to separate the second inner cavity 201 into four second sub-cavities 201a arranged along the height direction.

[0044] Based on the embodiment where the inlet 202 and outlet 203 are both located at the same end of the crossbeam 210, with the inlet 202 located on the upper side and the outlet 203 located on the lower side. In one embodiment, the flow port 204a on each branch beam 204 can be configured as follows: the flow port 204a of the uppermost branch beam 204 is away from the inlet 202; the flow port 204a of the next uppermost branch beam 204 is close to the inlet 202; the flow port 204a of the next middle branch beam 204 is away from the inlet 202; the flow port 204a of the next lowermost crossbeam 210 is close to the inlet 202; and the flow port 204a of the next lowest branch beam 204 is away from the inlet 202, so that after entering the lowermost second compartment 201a through the flow port 204a of the lowermost branch beam 204, it flows out towards the outlet 203. In summary, the flow ports 204a of each pair of adjacent beams 204 are not at the same end, allowing the cooling medium to flow in either the "Z" or "S" direction. This enables the cooling medium to flow through all the second chambers 201a and then out of the outlet 203.

[0045] In another embodiment, each sub-beam 204 may be provided with a plurality of flow ports 204a, which are distributed along the length direction of the corresponding sub-beam 204.

[0046] In yet another implementation, please continue to see Figure 6 A central dividing beam 2041 is provided along the centerline of the crossbeam 210, dividing the second inner cavity 201 into an upper and lower half. At least one upper dividing beam 2042 is provided in the upper half, and at least one lower dividing beam 2043 is provided in the lower half. The central dividing beam 2041 can change the flow direction of the cooling medium, causing the cooling medium flowing into the lower half to flow from the end away from the outlet 203 towards the outlet 203. Specifically, the end of the central dividing beam 2041 near the inlet 202 and outlet 203 is sealed to the cavity wall of the corresponding end of the second inner cavity 201, so that the upper dividing beam 2042, as... Figure 6The two upper half partition beams 2042 shown in FIG. 2 are formed with a first flow gap 205 between the end of the beam and the corresponding end wall of the second inner cavity 201. A portion of the cooling medium entering from the inlet 202 can flow into the uppermost second sub-cavity 201a, and another portion of the cooling medium can flow into the second sub-cavity 201a below the uppermost second sub-cavity 201a through the first flow gap 205. The remaining portion of the cooling medium flows into the second sub-cavity 201a above the central beam 2041. All the partition beams 204 are formed with a second flow gap 206 between the end of the beam and the corresponding end wall of the second inner cavity 201. The second flow gap 206 between the end of the uppermost upper half partition beam 2042 and the corresponding end wall of the second inner cavity 201 is smaller than the second flow gap 206 between the end of the central beam 2041 and the corresponding end wall of the second inner cavity 201. The cooling medium flows into the lowermost second sub-cavity 201a through the second flow gap 206, and then flows out of the outlet 203 after flowing through the lowermost second sub-cavity 201a. The lower half partition beam 2043 is formed with a second flow gap 206 between the end of the beam and the corresponding end wall of the second inner cavity 201, as shown in FIG. 2. Figure 6 The second flow gap 206 between the end of the lower half partition beam 2043 shown in FIG. 2 and the corresponding end wall of the second inner cavity 201 is greater than or equal to the second flow gap 206 between the end of the central beam 2041 and the corresponding end wall of the second inner cavity 201. This allows a portion of the cooling medium in the upper half to directly flow into the second sub-cavity 201a below the upper half. When there are multiple lower half partition beams 2043, the second flow gaps 206 can gradually decrease from top to bottom, so that each second sub-cavity 201a can receive corresponding cooling medium. Thus, the cooling medium flows through all the second sub-cavities 201a and then flows out of the outlet 203.

[0047] The cross beam 210 can also be configured to include a cross beam body 211 and a sealing block 212 sealing the two ends of the cross beam body 211, and the second inner cavity 201 penetrates through the cross beam body 211 along the length direction of the cross beam body 211, and the two sealing blocks 212 are used to seal the second inner cavity 201 from the ends of the cross beam 210. The sealing block 212 can be fixedly connected with the end of the cross beam 210 by a welding process, in order to improve the sealing effect and connection firmness, the sealing block 212 has an embedded part 212a embedded in the second inner cavity 201 and an abutting part 212b abutting against the end face of the cross beam 210, and a welding seam is formed between the abutting face of the abutting part 212b and the end face. Based on this scheme, the shell wall of the cross beam body 211 can be configured as a thin-walled shell, which can be made of a material with good heat exchange performance to increase the heat exchange efficiency. The end of the cross beam 210 is configured as a solid sealing block 212 with high strength, which ensures the connection strength of the cross beam 210 and the surrounding frame 120, and the sealing block 212 also plays a role of being connectable with the first cooling unit 300. The inlet 202 and the outlet 203 are both arranged on the sealing block 212, the outer end penetrates through the outer side face of the sealing block 212, the inner end penetrates through the inner side face of the sealing block 212, and the height of the inlet 202 is adapted to the height of the second sub-cavity 201a on the upper side of the cross beam 210, and the height of the outlet 203 is adapted to the height of the second sub-cavity 201a on the lower side of the cross beam 210.

[0048] Please continue to see Figure 3 The cross beam assembly 200 further includes a first reinforcing beam 220 and a second reinforcing beam 230, the first reinforcing beam 220 is connected with one end of the cross beam 210 and fixed (such as welded) to the inner wall of the surrounding frame 120, and the second reinforcing beam 230 is connected with the other end of the cross beam 210 and fixed (such as welded) to the other inner wall of the surrounding frame 120. The first reinforcing beam 220 and / or the second reinforcing beam 230 have a hollow third inner cavity 221. The first reinforcing beam 220 and the second reinforcing beam 230 not only have the effects of strengthening the strength of the cross beam assembly 200, increasing the integration degree of the cross beam assembly 200 and improving the assembly efficiency of the cross beam assembly 200 and the surrounding frame assembly 100, but also have the effects of accommodating, assembling and sealing part of the components (such as the input main pipe, the output main pipe and other main components described below) of the first cooling unit 300, which protects the important main components of the first cooling unit 300 and makes the internal layout of the battery box more simple.

[0049] In the shown embodiment, the first and second reinforcing beams 220 and 230 are fixedly connected with the end blocks 212 at both ends of the cross beam 210. Specifically, the lateral sides of the end blocks 212 are fixedly connected with the corresponding reinforcing beams via two connecting blocks 240 respectively, one end of the connecting block 240 being connected with the corresponding side of the end block 212 and the other end being connected with the corresponding reinforcing beam. In the horizontal projection plane, the two connecting blocks 240 are in the shape of "8", one end of each of which is connected with the lateral sides of the end block 212 and the other end of each of which is connected with the inner side of the corresponding reinforcing beam, and each of the connecting blocks 240 is located outside the inlet 202 and the outlet 203 to protect the inlet 202 and the outlet 203.

[0050] The first cooling unit 300 further comprises an input main pipe, an output main pipe and the cooling medium as described above. In the present embodiment, the cooling medium is preferably configured as cooling liquid, the input main pipe is correspondingly configured as an input liquid main pipe 310, and the output main pipe is correspondingly configured as an output liquid main pipe 320. The input end of the input liquid main pipe 310 is connected with a cooling liquid source and the output end is connected with the inlet 202; the input end of the output liquid main pipe 320 is connected with the outlet 203 and the output end is connected with a refrigeration device which cools the medium from the output liquid main pipe 320 to serve as the cooling liquid source.

[0051] Please refer to Figure 7 , the first cooling unit 300 further comprises an input branch pipe (not shown in the figure) connected with the input main pipe, an input joint connected between the input branch pipe and the inlet 202, an output branch pipe (not shown in the figure) connected with the output main pipe, and an output joint connected between the output branch pipe and the outlet 203, one end of each of the input joint and the output joint being fixedly connected with the cross beam 210 and the other end of each of the input joint and the output joint being detachably and airtightly connected with the corresponding branch pipe. The input branch pipe and the output branch pipe are correspondingly configured as an input liquid branch pipe and an output liquid branch pipe respectively. The input joint and the output joint are correspondingly configured as an input liquid joint 330 and an output liquid joint 340 respectively.

[0052] The inlet main pipe 310 and the outlet main pipe 320 can be fixed in the third inner cavity 221 along the length direction of the first reinforcing beam 220 or the second reinforcing beam 230, and can be fixed at the adjacent side frame 120, and the total inlet and the total outlet can be formed at the side frame 120. The inlet main pipe 310 and the outlet main pipe 320 are arranged in parallel along the height direction of the side frame 120, and the inlet main pipe 310 is arranged at the upper side and the outlet main pipe 320 is arranged at the lower side. According to the embodiment, the perforations 222 are formed at the inlet 202 (inlet) and the outlet 203 (outlet) of each cross beam 210 at the inner side wall of the first reinforcing beam 220 or the second reinforcing beam 230, for example, two perforations 222 arranged along the height direction of the corresponding reinforcing plate, and the two perforations 222 are used for the inlet branch pipe and the outlet branch pipe to pass through, so that one end of the inlet branch pipe and the outlet branch pipe is connected with the inlet main pipe 310 and the outlet main pipe 320 respectively, and the other end is connected with the inlet and the outlet respectively. The two connecting blocks 240 described above are respectively arranged on the two sides of the inlet connector 330 and the outlet connector 340.

[0053] In the embodiment shown, the inlet connector 330 and the outlet connector 340 can be configured as the same or similar structure. The outer end of the inlet connector 330 and the outlet connector 340 can be clamped on the outer periphery of the inlet branch pipe and the outlet branch pipe respectively by a clamping structure and in sealed communication with the inlet branch pipe and the outlet branch pipe respectively, and the inner end of the inlet connector 330 and the outlet connector 340 can be welded on the sealing block 212 respectively and in communication with the inlet and the outlet respectively.

[0054] The clamping structure includes a plurality of first clamping members arranged on the outer wall of the inlet main pipe 310 around the outer periphery of the inlet branch pipe, a first matching member arranged on the outer periphery of the inlet connector 330, a second clamping member arranged on the outer wall of the outlet main pipe 320 around the outer periphery of the outlet branch pipe, and a second matching member arranged on the outer periphery of the outlet connector 340. The first clamping member and the second clamping member are configured as elastic clamping members 350, the elastic clamping members 350 have elastic force in the radial direction of the corresponding branch pipe, and one end of the elastic clamping members 350 extending inward in the radial direction forms a clamping block 351, and the inner side surface (the side surface facing the center in the radial direction) of the clamping block 351 is configured as a circular arc surface matched with the outer peripheral surface of the corresponding connector. The first matching member and the second matching member are configured as an annular stepped surface 360 formed on the outer peripheral surface of the corresponding connector.

[0055] The outer circumferential surface of the outer end of the liquid inlet connector 330 and the liquid outlet connector 340 is configured as a tapered surface with an outer diameter gradually increasing from outside to inside (liquid inlet direction), which can facilitate the quick insertion of the corresponding connector into the space between the elastic clamping member 350 and the corresponding branch pipe. The liquid inlet connector 330 and the liquid outlet connector 340 also have a small-diameter section with an outer diameter smaller than the maximum outer diameter of the tapered surface, which is located on the inner end side of the tapered surface. The end surface of the tapered surface towards the small-diameter section forms the annular stepped surface 360.

[0056] Based on the above-described embodiments, the assembly process of the battery box of the utility model is as follows: first, each surrounding frame 120 is respectively welded with each edge of the bottom plate 110 to assemble into a surrounding frame assembly 100; second, the input connector and the output connector are respectively welded at the liquid inlet and the liquid outlet of each cross beam 210; the two connecting blocks 240 are connected to both ends of each cross beam 210, and the two connecting blocks 240 away from the input connector and the output connector are fixedly connected with one of the reinforcing beams; then, the liquid inlet main pipe 310 and the liquid outlet main pipe 320 are arranged in the other reinforcing beam, and the corresponding liquid inlet branch pipe and liquid outlet branch pipe are aligned with the perforations 222; next, the liquid inlet connector 330 and the liquid outlet connector 340 of each cross beam 210 are clamped on the outer periphery of the corresponding liquid inlet branch pipe and liquid outlet branch pipe, and the two connecting blocks 240 are fixedly connected with the reinforcing beam, thereby assembling into a cross beam assembly 200; finally, the cross beam assembly 200 is assembled in the first inner cavity 130 surrounded by the surrounding frame assembly 100, the first reinforcing beam 220 and the second reinforcing beam 230 are welded at the surrounding frame 120, and the exposed section of the liquid inlet main pipe 310 and the liquid outlet main pipe 320 is connected with the section arranged in the reinforcing beam, and the exposed section is fixed to the inner wall of the corresponding surrounding frame 120, so that the exposed section is in sealed communication with the total liquid inlet and the total liquid outlet on the surrounding frame 120.

[0057] Compared with the prior art, the battery box has the following beneficial effects: (1) the battery box is divided into a frame assembly and a beam assembly, two assemblies are assembled respectively, and then the two assemblies are assembled into the battery box, compared with the traditional mode that each beam needs to be assembled with the frame, the assembly mode of the beam and the reinforcing beam is not limited by the angle between the frame and the bottom plate, the assembly of the beam is more convenient and fast, the assembly time is saved, and the strength of the beam assembly is also strengthened; (2) the beam can not only play the original supporting and strengthening role, but also realize circulation of the cooling medium by structural modification of the inside of the beam, the cooling medium is delivered to the inside of the beam through the first cooling unit, and the cooling medium flows in the whole area from top to bottom through the special structure in the inside of the beam, and the two sides of the battery pack are uniformly heat-exchanged from top to bottom; (3) the liquid inlet and the liquid outlet are arranged at one end of the beam, during machining, the liquid inlet and the liquid outlet can be simultaneously machined and formed after one-time clamping and fixing, the parts do not need to be clamped and fixed in multiple directions for multiple times, the manufacturing difficulty is reduced; and the liquid inlet main pipe and the liquid outlet main pipe are arranged on the same side, the liquid inlet main pipe and the liquid outlet main pipe are assembled at one time, the assembly space of the liquid inlet main pipe and the liquid outlet main pipe is reduced, the assembly structure needs to be designed for the liquid inlet main pipe and the liquid outlet main pipe respectively, the number of parts is reduced, the assembly complexity is reduced, and the manufacturing cost is further saved; (4) the distribution position of the beam in the inside of the beam and the ingenious distribution of the flow guide members such as the flow port guide the cooling medium to one outlet on the same side, through the design of the beam in the utility model, only one inlet and one outlet are needed to realize the circulation of the cooling medium; multiple inlets and multiple outlets are not needed, and the probability of leakage of the cooling medium is reduced; (5) the original second cooling unit of the bottom plate realizes heat dissipation of the battery in the upward, downward and lateral directions, the heat exchange efficiency of the battery is improved, and the uniformity and comprehensiveness of the heat exchange of the battery are improved.

[0058] The above embodiments only express the preferred implementation modes of the utility model, the description is more specific and detailed, but it cannot be understood as the limitation on the scope of the utility model patent. It should be pointed out that, for ordinary skilled persons in the art, without departing from the concept of the utility model, a plurality of modifications and improvements can be made, which belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A battery case characterized by comprising: The application relates to a cooling system for a frame assembly, comprising: a frame assembly, comprising a bottom plate and a frame arranged along the periphery of the bottom plate, the frame and the bottom plate forming a first inner cavity; a beam assembly arranged in the first inner cavity and separating the first inner cavity into a plurality of first sub-cavities; and a cooling system, comprising a first cooling unit arranged at the beam assembly and a second cooling unit arranged at the bottom plate. The beam assembly comprises at least one beam having a second inner cavity, and the beam is provided with an inlet and an outlet; the first cooling unit comprises a cooling medium, and the cooling medium enters the second inner cavity through the inlet and flows out through the outlet.

2. The battery pack of claim 1, wherein: The beam further comprises a sub-beam arranged in the second inner cavity and separating the second inner cavity into a plurality of second sub-cavities, and the cooling medium flows through all the second sub-cavities and then flows out of the outlet.

3. The battery pack of claim 2, wherein: The sub-beam is arranged in the second inner cavity along the length direction of the beam, and the sub-beam separates the second inner cavity into a plurality of second sub-cavities arranged along the height direction of the beam; the sub-beam is provided with a flow-through opening for the cooling medium to flow from one second sub-cavity into another second sub-cavity.

4. The battery pack of claim 3, wherein: The inlet and the outlet are arranged at the end of the beam, and the inlet is closer to the upper side of the beam, and the outlet is closer to the lower side of the beam.

5. The battery pack of claim 4, wherein: The first cooling unit further comprises an input main pipe and an output main pipe; the input end of the input main pipe is connected to a cooling source, and the output end is connected to the inlet; the input end of the output main pipe is connected to the outlet, and the output end is connected to a refrigeration device which cools the medium from the output main pipe and serves as the cooling source.

6. The battery pack of claim 2, wherein: The first cooling unit further comprises an input branch pipe connected to the input main pipe, an input joint connected between the input branch pipe and the inlet, an output branch pipe connected to the output main pipe, and an output joint connected between the output branch pipe and the outlet.

7. The battery pack of claim 6, wherein: One end of each of the input joint and the output joint is fixedly connected to the beam, and the other end is detachably and airtightly connected to the corresponding branch pipe.

8. The battery pack of claim 7, wherein: The end of the beam is provided with a sealing block for sealing the second inner cavity, the sealing block has an embedding part embedded in the second inner cavity and an abutting part abutting against the end face of the beam, and a welding seam is formed between the abutting face of the abutting part and the end face of the beam; 9. The battery pack of claim 3, wherein: The inlet and the outlet are arranged on the sealing block, the outer end of the inlet and the outer end of the outlet pass through the outer side face of the sealing block outwardly, the inner end of the inlet and the inner end of the outlet pass through the inner side face of the sealing block inwardly, the height of the inlet is adapted to the height of the second sub-cavity on the upper side of the beam, and the height of the outlet is adapted to the height of the second sub-cavity on the lower side of the beam. The beam assembly further comprises:

10. The battery pack according to any one of claims 1 to 9, wherein a first reinforcing beam connected to one end of the beam and fixed to the inner wall of the frame; and a second reinforcing beam connected to the other end of the beam and fixed to the other inner wall of the frame. ​

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