Battery box body

Abstract

The invention discloses a battery box, which comprises: an enclosure frame assembly, which comprises a bottom plate and an enclosure frame arranged along the periphery of the bottom plate, and the enclosure frame and the bottom plate enclose to form a first inner cavity; 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 disclosed by the invention, 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 also 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 present invention relates to the technical field of batteries, and in particular to a battery box. Background Art

[0002] As a key component of the power battery system of new energy vehicles, the battery box is mainly used to carry, fix and protect the battery cells and modules to ensure the safety and range of the battery system. It is not only the physical carrier of the battery system, but also undertakes multiple functions such as thermal management, electrical connection, waterproof and dustproof. Thermal management is an important part of the battery box design. It is necessary to ensure the uniformity of heat dissipation of the battery system and the efficiency of the thermal management system to ensure the performance and life of the battery.

[0003] Existing cooling structures mostly use a water cooling structure set at the bottom of the battery box. The water cooling structure is in direct contact with the bottom of the battery module and cools the battery module by heat exchange. However, this cooling method has a significant problem: it causes a temperature difference between the upper and lower parts of the battery module along its thickness direction, which will affect the service life and performance of the battery module, reduce the usability of the battery pack, and increase the risk of thermal runaway of the battery. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a battery box that improves heat exchange uniformity and heat exchange efficiency.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: providing a battery box, comprising:

[0006] A surrounding frame assembly, comprising a bottom plate and a surrounding frame arranged along the periphery of the bottom plate, wherein the surrounding frame and the bottom plate together form a first inner cavity;

[0007] a crossbeam assembly, disposed in the first inner cavity and dividing the first inner cavity into a plurality of first sub-cavities; and

[0008] The cooling system includes a first cooling unit arranged at the crossbeam assembly and a second cooling unit arranged at the bottom plate.

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

[0010] Furthermore, the crossbeam also has a sub-beam arranged in the second inner cavity and divides it into a plurality of second sub-cavities, and the cooling medium flows out from the outlet after flowing through all the second sub-cavities.

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

[0012] Furthermore, the inlet and the outlet are both arranged at the ends of the crossbeam, and the inlet is closer to the upper side of the crossbeam, and the outlet is closer to the lower side of the crossbeam.

[0013] Furthermore, the first cooling unit also includes 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, and the refrigeration device cools the medium from the output main pipe and uses it as a cooling source.

[0014] Furthermore, the first cooling unit also includes 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] Furthermore, one end of the input connector and the output connector is fixedly connected to the crossbeam, and the other end is detachably and airtightly connected to the corresponding branch pipe.

[0016] Furthermore, a sealing block for sealing the second inner cavity is configured at the end of the crossbeam, and the sealing block has an embedding portion embedded in the second inner cavity and an abutting portion abutting against the end surface of the crossbeam, and a weld is formed between the abutting surface of the abutting portion and the end surface of the crossbeam;

[0017] The inlet and outlet are both arranged on the sealing block, with the outer end thereof penetrating the outer side surface of the sealing block outwardly and the inner end thereof penetrating the inner side surface of the sealing block inwardly, and the height of the inlet is adapted to the height of the second sub-chamber on the upper side of the beam, and the height of the outlet is adapted to the height of the second sub-chamber on the lower side of the beam.

[0018] Furthermore, the crossbeam assembly also includes:

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

[0020] A second reinforcing beam is 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 case of the present invention has the following beneficial effects: (i) The battery case is divided into a frame assembly and a beam assembly, and the two assemblies are assembled separately and then assembled into a battery case. Compared with the traditional method in which each beam needs to be assembled with the frame, the assembly method of the beam and the reinforcement beam is not limited by the angle between the frame and the bottom plate, making the assembly of the beam more convenient and quick, saving assembly time, and enhancing the strength of the beam assembly. (ii) The beam can not only play the original supporting and reinforcing role, but also realize the circulation of the coolant medium by modifying the structure inside the beam, transport the cooling medium to the inside of the beam through the first cooling unit, and realize the full-area flow of the cooling medium from top to bottom through the unique structure inside the beam, so as to evenly exchange heat from top to bottom on both sides of the battery pack. (III) The liquid inlet and the liquid outlet are both set at one end of the crossbeam. During processing, the liquid inlet and the liquid outlet can be processed and formed at the same time after only one clamping and fixing. There is no need to clamp and fix the parts multiple times and in multiple directions, which reduces the manufacturing difficulty; and the liquid inlet pipe and the liquid outlet pipe can be set on the same side, which is convenient for the one-time assembly of the liquid inlet pipe and the liquid outlet pipe, and reduces the assembly space of the liquid inlet pipe and the liquid outlet pipe. There is no need to design assembly structures for the liquid inlet pipe and the liquid outlet pipe respectively, which reduces the number of parts and reduces the complexity of assembly, and further saves manufacturing costs. (IV) The distribution position of the sub-beams inside the crossbeam and the ingenious distribution of the flow guide components such as the flow port all guide the cooling medium to an outlet on the same side. Through the design of the sub-beams of the present invention, only one inlet and outlet need to be designed to realize the circulation of the cooling medium; there is no need to design multiple inlets and multiple outlets, which reduces the probability of cooling medium leakage. (V) Combined with the original second cooling unit of the bottom plate, the heat dissipation of the battery in the upper, lower and side directions is realized, the heat exchange efficiency of the battery is improved, and the uniformity and comprehensiveness of the heat exchange of the battery are improved. In summary, the battery box of the present invention can achieve better cooling and heat exchange effects by simply and cleverly modifying the internal structure of the beam without incurring high costs and configuring a complex cooling structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 1 It is a schematic structural diagram of a battery case according to an embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of a battery case according to another embodiment of the present invention from another perspective.

[0025] Figure 3It is a schematic diagram of the assembly of the crossbeam assembly and the first cooling unit in one embodiment of the battery box of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the crossbeam in one embodiment of the battery box of the present invention.

[0027] Figure 5 It is a longitudinal cross-sectional view of a cross beam in one embodiment of a battery box of the present invention.

[0028] Figure 6 It is a longitudinal cross-sectional view of a cross beam in another embodiment of a battery box of the present invention.

[0029] Figure 7 It is a schematic diagram of the connection between the crossbeam and the first cooling unit in one embodiment of the battery box of the present invention.

[0030] The accompanying drawings in the specification are as follows:

[0031] Surrounding frame assembly 100; bottom plate 110; surrounding 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; central sub-beam 2041; upper sub-beam 2042; first flow guide gap 205; second flow guide gap 206; crossbeam body 211; sealing block 212; embedded portion 212a; abutment portion 212b; first reinforcing beam 220; third inner cavity 221; through hole 222; second reinforcing beam 230; connecting block 240;

[0033] The first cooling unit 300 ; the liquid inlet main pipe 310 ; the liquid outlet main pipe 320 ; the liquid inlet joint 330 ; the liquid outlet joint 340 ; the elastic clamping member 350 ; the clamping block 351 ; and the annular step surface 360 ​​. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are 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 may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] See also Figure 1 , Figure 2 and Figure 3 , Figure 1 It is a schematic structural diagram of a battery case according to an embodiment of the present invention. Figure 2 It is a structural schematic diagram of a battery case according to another embodiment of the present invention from another perspective. Figure 3 Schematic diagram of the assembly of the crossbeam assembly and the first cooling unit of the battery box of the present invention. Figure 1 , Figure 2 and Figure 3 The structure shown in the figure is used as an example to illustrate the battery box of the present invention, so as to more clearly show the various components and matching relationships of the battery box. Figure 1 , Figure 2 and Figure 3 The battery case shown is described in detail as an example, but this example is not used to limit the scope of the battery case of the present invention. Except for the components that solve the necessary technical problems of the present invention, the remaining components can be regarded as non-essential technical elements, which can be replaced by other technical elements with the same or similar functions or structures in other embodiments. Alternatively, these non-essential technical elements may not be needed in other embodiments.

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

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

[0040] The crossbeam assembly 200 includes at least one crossbeam 210 disposed in the first inner cavity 130, and the at least one crossbeam 210 divides the first inner cavity 130 into at least two first sub-cavities 131. The orientation, quantity, and distribution position of the crossbeam 210 are configured according to the orientation, quantity, and size of the battery pack in different embodiments. For example, the crossbeam 210 can be configured as a plurality of crossbeams distributed at intervals along the length direction of the battery case, and each crossbeam 210 extends along the width direction of the battery case (that is, the length direction of each crossbeam 210 is consistent with the width direction of the battery case). For another example, the crossbeam 210 can be configured as a plurality of crossbeams distributed at intervals along the width direction of the battery case, and each crossbeam 210 extends along the length direction of the battery case (that is, the length direction of each crossbeam 210 is consistent with the length direction of the battery case). In this embodiment, eight cross beams 210 are arranged at intervals along the length direction of the battery box. The eight cross beams 210 and two short side frames 120 divide the first inner cavity 130 into nine first sub-cavities 131. The length of each first sub-cavity 131 extends along the width direction of the battery box, and the width extends along the length direction of the battery box.

[0041] See also Figure 4 and Figure 5 The crossbeam 210 is configured as a hollow crossbeam having a hollow second inner cavity 201. The crossbeam 210 is provided with an inlet 202 and an outlet 203 communicating with the first cooling unit 300. 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 crossbeam 210, can be configured at two ends of the crossbeam 210 respectively, and can also be configured at the side of the crossbeam 210. In this embodiment, the inlet 202 and the outlet 203 are both provided at the ends of the crossbeam 210, and the inlet 202 is closer to the upper side of the crossbeam 210, and the outlet 203 is closer to the lower side of the crossbeam 210.

[0042] See also Figure 5 and Figure 6The crossbeam 210 also has a sub-beam 204 disposed in the second inner cavity 201 and dividing it into a plurality of second sub-cavities 201a. 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 configured to be distributed in the second inner cavity 201 along the length direction of the crossbeam 210. The sub-beam 204 divides the second inner cavity 201 into a plurality of second sub-cavities 201a distributed along the height direction thereof. The sub-beam 204 is provided with a flow port 204a (such as a cooling port 204a) for the cooling medium to flow from one second sub-cavity 201a into another second sub-cavity 201a. Figure 5 As shown). The advantage of arranging the second sub-chamber 201a horizontally is that, since the lower part of the battery pack exchanges heat through the second cooling unit at the bottom plate 110, the heat dissipation effect of the lower part of the battery pack far exceeds the heat dissipation effect of the upper part of the battery pack. Therefore, the cooling medium can first enter the second sub-chamber 201a located on the upper side of the crossbeam 210, and then flow downward through all the second sub-chambers 201a in sequence and then flow to the bottom of the crossbeam 210; the cooling medium preferentially exchanges heat with the upper part of the battery pack through the upper side of the crossbeam 210, and then the cooling medium sequentially flows downward to exchange heat with the battery pack through the lower side of the crossbeam 210, and the heat is exchanged with the battery pack from the upper (first cooling unit 300 from top to bottom) and lower (second cooling unit from bottom to top) convection directions, thereby improving the heat dissipation efficiency and heat dissipation uniformity of the battery pack.

[0043] For example, see Figure 5 Five sub-beams 204 can be configured in the second inner cavity 201. The five sub-beams 204 are evenly spaced in the second inner cavity 201 of the crossbeam 210 along the height direction of the crossbeam 210. Each sub-beam 204 extends along the length direction of the crossbeam 210, and the two lateral sides of each sub-beam 204 are respectively connected to the two lateral cavity walls of the second inner cavity 201, so as to divide the second inner cavity 201 into four second sub-cavities 201a distributed along the height direction.

[0044] Based on the embodiment that the inlet 202 and the outlet 203 are both arranged at the same end of the cross beam 210, and the inlet 202 is located at the upper side and the outlet 203 is located at the lower side. In one embodiment, the flow opening 204a on each sub-beam 204 can be arranged as follows: the flow opening 204a of the sub-beam 204 located at the uppermost side is far away from the inlet 202, the flow opening 204a of the sub-beam 204 located at the next uppermost side is close to the inlet 202, the flow opening 204a of the sub-beam 204 located at the next middle side is far away from the inlet 202, the flow opening 204a of the cross beam 210 located at the next lower side is close to the inlet 202, and the flow opening 204a located at the next lower side is far away from the inlet 202, so that after entering the second sub-chamber 201a at the lowermost side through the flow opening 204a of the sub-beam 204 at the lowermost side, it flows out towards the outlet 203. In summary, the flow openings 204 a of every two adjacent sub-beams 204 are not at the same end, so that the cooling medium flows in the “Z” direction or the “S” direction, so that the cooling medium can flow through all the second sub-cavities 201 a and then flow out from the outlet 203 .

[0045] In yet another embodiment, a plurality of flow openings 204 a may be disposed on each sub-beam 204 , and the plurality of flow openings 204 a are distributed along the length direction of the corresponding sub-beam 204 .

[0046] In another embodiment, please continue to refer to Figure 6 A central sub-beam 2041 is provided at the center line along the length direction of the cross beam 210. The central sub-beam 2041 divides the second inner cavity 201 into an upper half and a lower half. At least one upper half sub-beam 2042 is provided in the upper half, and at least one lower half sub-beam 2043 is provided in the lower half. The central sub-beam 2041 can change the flow direction of the cooling medium, so that the cooling medium flowing into the lower half flows from the direction away from the end of the outlet 203 to the direction of the outlet 203. Specifically, the end of the central sub-beam 2041 close to the inlet 202 and the outlet 203 is tightly connected to the cavity wall of the corresponding end of the second inner cavity 201, so that the upper half sub-beam 2042, as shown in FIG. Figure 6The two upper sub-beams 2042 shown in the figure have one end near the inlet 202 and the outlet 203 and form a first guide gap 205 with the cavity wall of the corresponding end of the second inner cavity 201. A part of the cooling medium entering from the inlet 202 can flow into the second sub-cavity 201a at the uppermost side, a part of the cooling medium can flow into the second sub-cavity 201a at the second upper side through the first guide gap 205, and the other part all flows into the second sub-cavity 201a on the upper side of the central sub-beam 2041. A second guide gap 206 is formed between the end of all the sub-beams 204 away from the inlet 202 and the outlet 203 and the cavity wall of the corresponding end of the second inner cavity 201. The second guide gap 206 between the end of the upper half partition beam 2042 located at the uppermost side away from the inlet 202 and the outlet 203 and the corresponding end of the second inner cavity 201 is small, and the cooling medium falls into the lowermost second sub-cavity 201a through the second guide gap 206, flows through the lowermost second sub-cavity 201a, and then flows out from the outlet 203. The lower half partition beam 2043, such as Figure 6 The second flow guide gap 206 between the end of the lower half partition beam 2043 away from the outlet 203 and the corresponding end is greater than or equal to the second flow guide gap 206 between the central cross beam 210 and the corresponding end, so that part of the cooling medium in the upper half can directly enter the second sub-cavity 201a at the lower side. When there are multiple lower half partition beams 2043, the second flow guide gap 206 can be gradually reduced from top to bottom, so that the corresponding cooling medium can enter each second sub-cavity 201a. In this way, 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 sealed at two ends of the cross beam body 211. The second inner cavity 201 penetrates 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 to the end of the cross beam 210 through a welding process. In order to improve the sealing effect and the firmness of the connection, the sealing block 212 has an embedded portion 212a embedded in the second inner cavity 201 and an abutting portion 212b abutting against the end face of the cross beam 210, and a weld is formed between the abutting surface of the abutting portion 212b and the end face. Based on this solution, the shell wall of the cross beam body 211 can be configured as a thin-walled shell, and the thin-walled shell 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 to ensure the connection strength between the cross beam 210 and the enclosure 120, and the sealing block 212 also plays the role of connecting with the first cooling unit 300. The inlet 202 and the outlet 203 are both arranged on the sealing block 212, and the outer end thereof penetrates the outer side surface of the sealing block 212 outwardly, and the inner end thereof penetrates the inner side surface of the sealing block 212 inwardly, 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 crossbeam assembly 200 further includes a first reinforcing beam 220 and a second reinforcing beam 230. The first reinforcing beam 220 is connected to one end of the crossbeam 210 and fixed to (such as welded and fixed) the inner wall of the enclosure 120, and the second reinforcing beam 230 is connected to the other end of the crossbeam 210 and fixed to (such as welded and fixed) the other inner wall of the enclosure 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 functions of strengthening the strength of the crossbeam assembly 200, increasing the integration of the crossbeam assembly 200 and improving the assembly efficiency of the crossbeam assembly 200 and the enclosure assembly 100, but also have the functions of accommodating, assembling and enclosing some components of the first cooling unit 300 (such as the main components such as the input main pipe and the output main pipe described below), protecting the important main components of the first cooling unit 300, and making the internal layout of the battery box more concise.

[0049] In the illustrated embodiment, the first reinforcing beam 220 and the second reinforcing beam 230 are respectively fixedly connected to the sealing blocks 212 at both ends of the crossbeam 210. Specifically, the two lateral sides of the sealing block 212 are respectively fixedly connected to the corresponding reinforcing beams through two connecting blocks 240, one end of the connecting block 240 is connected to the corresponding side of the sealing block 212, and the other end is connected to the corresponding reinforcing beam. On the horizontal projection plane, the two connecting blocks 240 are in an "eight" shape, and their ends close to each other are respectively connected to the two lateral side surfaces of the sealing block 212, and their ends far away from each other are connected to the inner side of the corresponding reinforcing beam. They are respectively located outside the two sides of the inlet 202 and the outlet 203 to protect the inlet 202 and the outlet 203.

[0050] The first cooling unit 300 also includes an input main pipe, an output main pipe and the cooling medium described above. In this embodiment, the cooling medium is preferably configured as a coolant, the input main pipe is correspondingly configured as a liquid inlet main pipe 310, and the output main pipe is correspondingly configured as a liquid outlet main pipe 320. The input end of the liquid inlet main pipe 310 is connected to a cooling liquid source, and the output end is connected to the inlet 202; the input end of the liquid outlet main pipe 320 is connected to the outlet 203, and the output end is connected to a refrigeration device, and the refrigeration device cools the medium from the liquid outlet main pipe 320 and uses it as a cooling liquid source.

[0051] See also Figure 7 The first cooling unit 300 further includes an input branch pipe (not shown) connected to the input main pipe, an input joint connected between the input branch pipe and the inlet 202, an output branch pipe (not shown) connected to 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 is fixedly connected to the crossbeam 210, and the other end is detachably and tightly connected to the corresponding branch pipe. The input branch pipe and the output branch pipe are respectively configured as a liquid inlet branch pipe and a liquid outlet branch pipe. The input joint and the output joint are respectively configured as a liquid inlet joint 330 and a liquid outlet joint 340.

[0052] Parts of the liquid inlet main pipe 310 and the liquid 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 reinforced beam, and the other parts can be fixed at the adjacent side enclosure 120, and a total liquid inlet and a total liquid outlet are provided at the side enclosure 120. The liquid inlet main pipe 310 and the liquid outlet main pipe 320 are arranged in parallel along the height direction of the enclosure 120, with the liquid inlet main pipe 310 located at the upper side and the liquid outlet main pipe 320 located at the lower side. Based on this embodiment, a through hole 222 is provided at the inner side wall of the first reinforcing beam 220 or the second reinforcing beam 230 corresponding to the inlet 202 (liquid inlet) and the outlet 203 (liquid outlet) of each cross beam 210, for example, two through holes 222 distributed along the height direction of the corresponding reinforcing plate, and the two through holes 222 are used for the liquid inlet branch pipe and the output branch pipe to pass through them respectively, so that one end of the liquid inlet branch pipe and the output branch pipe are respectively connected to the liquid inlet main pipe 310 and the liquid outlet main pipe 320, and the other end is respectively connected to the liquid inlet and the liquid outlet. The two connecting blocks 240 mentioned above are respectively covered on both sides of the liquid inlet joint 330 and the liquid outlet joint 340.

[0053] In the illustrated embodiment, the liquid inlet joint 330 and the liquid outlet joint 340 may be configured as the same or similar structures. The outer ends of the liquid inlet joint 330 and the liquid outlet joint 340 may be respectively clamped to the outer periphery of the liquid inlet branch pipe and the liquid outlet branch pipe through a clamping structure and be in close communication with them, and the inner ends of the liquid inlet joint 330 and the liquid outlet joint 340 may be respectively welded to the sealing block 212 and be in communication with the liquid inlet and the liquid outlet.

[0054] The clamping structure includes a plurality of first clamping members arranged on the outer wall of the liquid inlet main pipe 310 around the periphery of the liquid inlet branch pipe, a first matching member arranged on the periphery of the liquid inlet joint 330, a second clamping member arranged on the outer wall of the liquid outlet main pipe 320 around the periphery of the liquid outlet branch pipe, and a second matching member arranged on the periphery of the liquid outlet joint 340, the first clamping member and the second clamping member are both configured as elastic clamping members 350, the elastic clamping member 350 has elastic force in the radial direction of the corresponding branch pipe, the elastic clamping member 350 extends inwardly in the radial direction toward one end of the corresponding joint to form a clamping block 351, the inner side surface of the clamping block 351 (the side surface facing the center in the radial direction) is configured as a circular arc surface adapted to the outer peripheral surface of the corresponding joint. The first matching member and the second matching member are both configured as an annular step surface 360 ​​formed on the outer peripheral surface of the corresponding joint.

[0055] The outer peripheral surface of the outer end of the liquid inlet connector 330 and the liquid outlet connector 340 is configured as a conical surface with an outer diameter gradually increasing from the outside to the inside (inlet direction), and the conical surface can facilitate the corresponding connector to be quickly inserted into the space between the elastic clamp 350 and the corresponding branch pipe. The liquid inlet connector 330 and the liquid outlet connector 340 also have a small outer diameter section located at the inner end side of the conical surface and with an outer diameter smaller than the maximum outer diameter of the conical surface, and the end surface of the conical surface facing the small outer diameter section forms the annular step surface 360.

[0056] Based on the above-described embodiments, the assembly process of the battery box of the present invention is as follows: first, each enclosure 120 is welded to each edge of the bottom plate 110 to assemble into an enclosure assembly 100; second, the input connector and the output connector are welded to the liquid inlet and the liquid outlet of each crossbeam 210; both ends of each crossbeam 210 are connected to two connecting blocks 240, and the two connecting blocks 240 at one end away from the input connector and the output connector are fixedly connected to one of the reinforcement beams; then, the liquid inlet main pipe 310 and the liquid outlet main pipe 320 are passed through another reinforced beam, and the corresponding liquid inlet branch pipe and liquid outlet branch pipe are aligned with the through hole 222; then, each The liquid inlet joint 330 and the liquid outlet joint 340 of the root crossbeam 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 to the reinforcing beam, thereby assembling the crossbeam assembly 200; finally, the crossbeam assembly 200 is assembled in the first inner cavity 130 enclosed by the frame assembly 100, so that the first reinforcing beam 220 and the second reinforcing beam 230 are both welded to the frame 120, and the exposed section of the liquid inlet main pipe 310 and the liquid outlet main pipe 320 is connected to a section passing through the reinforcing beam, and the exposed section is fixed to the inner wall of the corresponding frame 120, so that the exposed section is sealed and connected with the total liquid inlet and total liquid outlet on the frame 120.

[0057] Compared with the prior art, the battery case of the present invention has the following beneficial effects: (a) The battery case is divided into a frame assembly and a beam assembly, and the two assemblies are assembled separately and then assembled into a battery case. Compared with the traditional method that each beam needs to be assembled with the frame, the assembly method of the beam and the reinforcement beam is not limited by the angle between the frame and the bottom plate, making the assembly of the beam more convenient and quick, saving assembly time, and enhancing the strength of the beam assembly. (b) The beam can not only play the original supporting and reinforcing role, but also realize the circulation of the coolant medium by modifying the structure inside the beam, and transport the cooling medium to the inside of the beam through the first cooling unit. The cooling medium can flow in the whole area from top to bottom through the unique structure inside the beam, and evenly exchange heat from top to bottom on the two sides of the battery pack. (III) The liquid inlet and the liquid outlet are both set at one end of the crossbeam. During processing, the liquid inlet and the liquid outlet can be processed and formed at the same time after only one clamping and fixing. There is no need to clamp and fix the parts multiple times and in multiple directions, which reduces the manufacturing difficulty; and the liquid inlet pipe and the liquid outlet pipe can be set on the same side, which is convenient for the one-time assembly of the liquid inlet pipe and the liquid outlet pipe, and reduces the assembly space of the liquid inlet pipe and the liquid outlet pipe. There is no need to design assembly structures for the liquid inlet pipe and the liquid outlet pipe respectively, which reduces the number of parts and reduces the complexity of assembly, and further saves manufacturing costs. (IV) The distribution position of the sub-beams inside the crossbeam and the ingenious distribution of the flow guide components such as the flow port all guide the cooling medium to an outlet on the same side. Through the design of the sub-beams of the present invention, only one inlet and outlet need to be designed to realize the circulation of the cooling medium; there is no need to design multiple inlets and multiple outlets, which reduces the probability of cooling medium leakage. (V) Combined with the original second cooling unit of the bottom plate, the heat dissipation of the battery in the upper, lower and side directions is realized, the heat exchange efficiency of the battery is improved, and the uniformity and comprehensiveness of the heat exchange of the battery are improved. In summary, the battery box of the present invention can achieve better cooling and heat exchange effects by simply and cleverly modifying the internal structure of the beam without incurring high costs and configuring a complex cooling structure.

[0058] The above embodiments only express the preferred implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A battery box, characterized in that: include: A surrounding frame assembly, comprising a bottom plate and a surrounding frame arranged along the periphery of the bottom plate, wherein the surrounding frame and the bottom plate together form a first inner cavity; A crossbeam assembly is arranged in the first inner cavity and divides the first inner cavity into a plurality of first sub-cavities; as well as The cooling system includes a first cooling unit arranged at the crossbeam assembly and a second cooling unit arranged at the bottom plate.

2. The battery case according to claim 1, characterized in that: The crossbeam assembly includes at least one crossbeam having a second inner cavity, which is provided with an inlet and an outlet; the first cooling unit includes a cooling medium, and the cooling medium enters the second inner cavity through the inlet and flows out through the outlet.

3. The battery case according to claim 2, characterized in that: The crossbeam also has a sub-beam which is arranged in the second inner cavity and divides the second inner cavity into a plurality of second sub-cavities. The cooling medium flows through all the second sub-cavities and then flows out from the outlet.

4. The battery case according to claim 3, characterized in that: The sub-beams are configured to be distributed in the second inner cavity along the length direction of the crossbeam, and the sub-beams divide the second inner cavity into a plurality of second sub-cavities distributed along the height direction thereof; and the sub-beams are provided with flow openings for the cooling medium to enter from one second sub-cavity into another second sub-cavity.

5. The battery case according to claim 4, characterized in that: The inlet and the outlet are both arranged at the ends 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.

6. The battery case according to claim 2, characterized in that: The first cooling unit also includes 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, and the refrigeration device cools the medium from the output main pipe and uses it as a cooling source.

7. The battery case according to claim 6, characterized in that: The first cooling unit further includes 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.

8. The battery case according to claim 7, characterized in that: One end of the input connector and the output connector is fixedly connected to the crossbeam, and the other end is detachably and airtightly connected to the corresponding branch pipe.

9. The battery case according to claim 3, characterized in that: The end of the cross beam is provided with a sealing block for sealing the second inner cavity, the sealing block having an embedding portion embedded in the second inner cavity and an abutting portion abutting against the end surface of the cross beam, a weld is formed between the abutting surface of the abutting portion and the end surface of the cross beam; The inlet and outlet are both arranged on the sealing block, with the outer end thereof penetrating the outer side surface of the sealing block outwardly and the inner end thereof penetrating the inner side surface of the sealing block inwardly, and the height of the inlet is adapted to the height of the second sub-chamber on the upper side of the beam, and the height of the outlet is adapted to the height of the second sub-chamber on the lower side of the beam.

10. The battery case according to any one of claims 1 to 9, characterized in that: The crossbeam assembly also includes: a first reinforcing beam connected to one end of the cross beam and fixed to the inner wall of the enclosure frame; A second reinforcing beam is connected to the other end of the cross beam and fixed to the other inner wall of the surrounding frame.

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