Battery housing, battery pack and vehicle

Abstract

A battery housing, a battery pack, and a vehicle are disclosed, the battery housing including a tray (2), at least one module cross beam (3), and a liquid cooling plate (4). A first passage (21) is formed in the tray (2), and an explosion-proof valve (22) communicating with the first passage (21) is provided in the tray (2). The module cross beam (3) is provided in the tray (2), and has a storage section (31) in the module cross beam (3), at least a part of the bottom of the storage section (31) forms a groove (312) recessed downward and capable of storing gas, and at least one end of the groove (312) along the length direction of the module cross beam (3) is provided with openings (3121, 3122). The liquid cooling plate (4) is sealed and connected to the bottom outside of the module cross beam (3), and at least one connecting passage (321, 322, 331, 332) is formed between the liquid cooling plate (4) and the module cross beam (3), and the openings (3121, 3122) are connected to the first passage (21) via the connecting passages (321, 322, 331, 332).

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application bearing application number 202122973127.X and entitled "Battery Housing, Battery Pack and Vehicle" filed with the State Intellectual Property Office of the People's Republic of China on November 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the technical field of batteries, and more particularly to battery housings, battery packs, and vehicles. [Background technology]

[0003] Currently, battery packs must always include a middle beam to increase their strength. However, because the middle beam occupies a portion of the battery pack's space, the overall utilization rate of the battery pack is reduced. Therefore, a new technological solution is to use a middle beam within the battery pack and to install a battery module within the middle beam. However, when a battery module is installed within the middle beam, if a thermal failure occurs in the battery, the generated high-temperature, high-pressure gas cannot be cooled and discharged from the battery pack in a timely manner, resulting in a problem of rapid accumulation of high-temperature gas that cannot be discharged. This can lead to thermal runaway in adjacent cells, and ultimately to all cells in the battery pack, which can easily ignite. Therefore, there is an urgent need to address how to cool and discharge the gas generated from the cell module within the middle beam and thereby improve the safety of the battery pack. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to solve the above technical problems, one object of the present application is to provide a battery housing, a battery pack, and a vehicle. The battery housing of the present application can protect the battery pack and improve the safety of the battery pack by cooling the high-temperature gas generated from the cell module, quickly diffusing the gas in a direction toward the tray, and then discharging the gas from the battery pack. [Means for solving the problem]

[0005] A first aspect of the present invention provides a battery housing, the battery housing including a tray, at least one module cross beam, and a liquid cooling plate; a first passage is formed in the tray, and an explosion-proof valve is provided in the tray, the first passage communicates with the explosion-proof valve; The module horizontal beam is provided in the tray, and the module horizontal beam has a storage section therein, and at least a part of the bottom of the storage section is recessed downward to form a groove capable of storing gas, and an opening is provided at at least one end of the groove along the length direction of the module horizontal beam, The liquid cooling plate is sealed and connected to the bottom outside of the module cross beam, and at least one connecting passage is formed between the liquid cooling plate and the module cross beam, and the opening communicates with the first passage through the connecting passage.

[0006] Preferably, the module cross beam includes a first connecting portion and a second connecting portion, the first connecting portion, the accommodating portion and the second connecting portion are fixedly connected in order, and the first connecting portion and the second connecting portion are respectively connected to the tray; The groove has a first opening and a second opening at both ends along the longitudinal direction of the module cross beam, the first connection portion forms a second passage with the liquid cooling plate in the longitudinal direction of the module cross beam, and the second connection portion forms a third passage with the liquid cooling plate in the longitudinal direction of the module cross beam; One end of the second passage communicates with the first opening, and one end of the third passage communicates with the second opening.

[0007] Preferably, the first connection portion and the second connection portion are provided with a first communication port and a second communication port, respectively, the other end of the second passage communicates with one end of the first communication port, the other end of the third passage communicates with one end of the second communication port, and the other ends of the first communication port and the second communication port each communicate with the first passage.

[0008] Preferably, the second passage includes a first connecting passage and a second connecting passage provided on both sides of the module cross beam in the length direction, and the third passage includes a third connecting passage and a fourth connecting passage provided on both sides of the module cross beam in the length direction, One end of the first connection passage and one end of the second connection passage each communicate with the first opening, one end of the third connection passage and one end of the fourth connection passage each communicate with the second opening, the first connection portion and the second connection portion are provided with a first communication port and a second communication port, respectively, the other end of the first connection passage and the other end of the second connection passage communicate with one end of the first communication port, the other end of the third connection passage and the other end of the fourth connection passage communicate with one end of the second communication port, and the other end of the first communication port and the other end of the second communication port each communicate with the first passage.

[0009] Preferably, the first connecting passage and the third connecting passage communicate with each other to form an integrated passage, and the second connecting passage and the fourth connecting passage communicate with each other to form an integrated passage.

[0010] Preferably, the depth of the groove is 3 mm to 5 mm, the difference between the length of the storage base and the length of the groove is 15 mm to 35 mm, and the difference between the width of the storage base and the width of the groove is 15 mm to 35 mm.

[0011] Preferably, the bottom of the module cross beam is connected to the liquid cooling plate via a thermally conductive structural adhesive.

[0012] Preferably, the modular cross beams are metal members.

[0013] Preferably, the module cross beam is made of an aluminum alloy material.

[0014] A second aspect of the present invention provides a battery pack, which includes a cell module and the battery housing according to the first aspect, and the cell module is disposed in the receiving portion.

[0015] Preferably, the cell module includes a plurality of cells, a pre-positioning bracket, and a housing, the bottom of the housing is open, the pre-positioning bracket is fastened to the opening at the bottom of the housing to form an accommodating space for accommodating cells, and a plurality of cell positioning portions are provided on the side of the pre-positioning bracket that is located within the accommodating space, and the plurality of cells are respectively provided within the plurality of cell positioning portions.

[0016] Preferably, the cell module further includes a positive electrode connection sheet and a negative electrode connection sheet, the positive electrode connection sheet and the negative electrode connection sheet being respectively located on the other side of the pre-positioning bracket and being insulated from each other, a through groove being provided in the bottom wall of the cell positioning portion, and the positive electrode or negative electrode of the cell being connected to the positive electrode connection sheet or the negative electrode connection sheet through the through groove.

[0017] Preferably, a potting agent is filled between the cell, the housing, the pre-positioning bracket, the positive electrode connection sheet, and the negative electrode connection sheet, and the potting agent seals and fixedly connects the cell, the housing, the pre-positioning bracket, the positive electrode connection sheet, and the negative electrode connection sheet.

[0018] Preferably, a rectangular adhesive-resistant foam cotton is provided between the cell module and the module cross beam, and a step portion is provided around the groove in the storage portion, the shape of the rectangular adhesive-resistant foam cotton matches the step portion, and the rectangular adhesive-resistant foam cotton is attached to the step portion.

[0019] Preferably, the rectangular opening of the rectangular adhesive-resistant foam cotton corresponds to the opening of the groove.

[0020] Preferably, the cell module is at least one of a ternary lithium cell module and a polymer lithium cell module.

[0021] Preferably, the cell is a cylindrical battery or a pouch battery.

[0022] Preferably, the cell module is provided with a relief valve, and the relief valve is provided facing the recessed groove.

[0023] A third aspect of the present invention provides a vehicle, the vehicle including the battery pack according to the second aspect.

[0024] Preferably, the vehicle is a pure electric vehicle or a hybrid vehicle.

[0025] One technical effect of the present application is as follows. In a battery housing according to an embodiment of the present application, a groove is formed at the bottom of the housing portion of the module cross beam to accommodate high-temperature, high-pressure gas generated by thermal runaway of a cell. A liquid cooling plate is connected to the bottom of the module cross beam to quickly cool the high-temperature, high-pressure gas. An opening is formed at the end of the groove to discharge the high-temperature, high-pressure gas. The discharged high-temperature, high-pressure gas is directionally discharged through a connecting passage to the first passage of the tray and then discharged from the battery pack by an explosion-proof valve. Because the gas is discharged directionally, other cells in the battery pack are not affected by the gas. The battery housing of the present application not only timely cools high-temperature, high-pressure gas generated by thermal failure of a cell, but also quickly and directionally discharges the gas from the battery pack, protecting the battery pack and improving its safety.

[0026] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application, taken in conjunction with the accompanying drawings. [Brief explanation of the drawings]

[0027] The drawings, which are incorporated into the specification, illustrate embodiments of the present application and, together with the specification, serve to explain the principles of the present application.

[0028] [Figure 1] 1 is a schematic diagram of a battery pack according to an embodiment of the present invention; [Figure 2]1 is a schematic diagram illustrating a part of a battery pack according to an embodiment of the present invention. [Figure 3] 1 is an exploded view of the structure of a battery pack according to an embodiment of the present application. [Figure 4] 1 is a schematic diagram of a pre-positioning bracket according to an embodiment of the present application; [Figure 5] FIG. 10 is a schematic diagram illustrating a configuration in which a module cross beam and a cell module according to an embodiment of the present application are fixed together. [Figure 6] FIG. 6 is a cross-sectional view of the AA plane in FIG. 5. [Figure 7] 3 is a schematic diagram showing the flow direction of gas in a groove according to an embodiment of the present application. FIG. [Figure 8] 10 is a schematic diagram of a part of the case where gas in a groove flows to a first connection part according to an embodiment of the present application. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0029] Various exemplary embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that unless specifically stated otherwise, the relative arrangement of parts and steps, numerical expressions and values ​​described in these embodiments do not limit the scope of the present application.

[0030] The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the present application, its application, or uses.

[0031] Techniques and devices known to those skilled in the art are not discussed in detail, but where appropriate, said techniques and devices should be considered part of the specification.

[0032] In all examples shown and discussed herein, any specific values ​​should be construed as illustrative only and not limiting, and therefore, other examples of the exemplary embodiments may have different values.

[0033] It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, it need not be further discussed in subsequent drawings.

[0034] A first aspect of the present application provides a battery housing. As shown in Fig. 1, the battery housing includes a tray 2, at least one module cross beam 3, and a liquid cooling plate 4. The module cross beam 3 is provided within the tray 2.

[0035] As shown in FIG. 2 , the module horizontal beam 3 includes a storage section 31, and at least a portion of the bottom of the storage section 31 is recessed downward to form a groove 312 capable of storing gas. An opening is provided at at least one end of the groove 312 along the longitudinal direction of the module horizontal beam 3. The liquid cooling plate 4 is sealed and connected to the outside of the bottom of the module cross beam 3, and at least one connecting passage is formed between the liquid cooling plate 4 and the module cross beam 3, and the opening communicates with the first passage 21 via the connecting passage.

[0036] In the battery housing according to the embodiment of the present application, if a cell generates high-temperature, high-pressure gas due to thermal runaway, the high-temperature, high-pressure gas breaks through the cell module, enters the groove, and is cooled by the liquid cooling plate. After initial cooling, the gas quickly diffuses to the opening of the groove, then diffuses directionally through the connecting passage to the tray, and breaks through the explosion-proof valve 22 to be discharged to the outside of the battery pack. The battery housing according to the present application allows the high-temperature, high-pressure gas generated by the cell to be cooled in a timely manner and then quickly and directionally discharged from the battery pack along the connecting passage and the first passage 21. This allows the cell to thermally diffuse, preventing adjacent cells from similarly experiencing thermal runaway due to high temperatures and igniting. This prevents the thermal runaway of a single cell from spreading to the entire battery pack, ensuring the safety of the entire battery pack and the safety of passengers in the electric vehicle. As described above, the battery housing according to the present application allows high-temperature gas generated by a cell due to thermal failure to be cooled in a timely manner and then quickly discharged from the battery pack, protecting the battery pack and improving its safety.

[0037] In one embodiment of the present application, as shown in FIGS. 2 and 4 , the module cross beam 3 includes a first connecting portion 32 and a second connecting portion 33, and the first connecting portion 32, the receiving portion 31, and the second connecting portion 33 are fixedly connected in sequence, and the first connecting portion 32 and the second connecting portion 33 are respectively connected to the tray 2; The groove 312 has a first opening 3121 and a second opening 3122 at both ends along the longitudinal direction of the module cross beam 3, The first connection portion 32 forms a second passage with the liquid cooling plate 4 in the longitudinal direction of the module cross beam 3, and the second connection portion 33 forms a third passage with the liquid cooling plate 4 in the longitudinal direction of the module cross beam 3. One end of the second passage is connected to the first opening 3121, one end of the third passage is connected to the second opening 3122, the first connection part 32 and the second connection part 33 are provided with a first communication port 323 and a second communication port 333, respectively, the other end of the second passage is connected to one end of the first communication port 323, the other end of the third passage is connected to one end of the second communication port 333, and the other ends of the first communication port 323 and the second communication port 333 are each connected to the first passage 21.

[0038] In one embodiment of the present application, the second passage includes a first connecting passage 321 and a second connecting passage 322 provided on both sides in the longitudinal direction of the module cross beam 3, and the third passage includes a third connecting passage 331 and a fourth connecting passage 332 provided on both sides in the longitudinal direction of the module cross beam 3, one end of the first connecting passage 321 and one end of the second connecting passage 322 respectively communicating with the first opening 3121, and one end of the third connecting passage 331 and one end of the fourth connecting passage 332 are respectively connected to the second opening 3122, and the first connection portion 32 and the second connection portion 33 are provided with a first communication port 323 and a second communication port 333, the other end of the first connection passage 321 and the other end of the second connection passage 322 are connected to one end of the first communication port 323, the other end of the third connection passage 331 and the other end of the fourth connection passage 332 are connected to one end of the second communication port 333, and the other end of the first communication port 323 and the other end of the second communication port 333 are each connected to the first passage 21. In this embodiment, the cell module is located in the center of the module cross beam, and both ends of the cell module are provided with connecting passages. If a cell generates high-temperature, high-pressure gas due to thermal runaway, the liquid cooling plate initially cools the high-temperature, high-pressure gas. The gas then quickly diffuses to the openings at both ends of the groove, through the connecting passages in the connection section, into the tray passage, and breaks through the explosion-proof valve 22 to be discharged to the outside of the battery pack. In this embodiment, high-temperature, high-pressure gas generated by a cell module failure enters the groove. As shown in Figure 7, the arrows in the figure indicate the gas flow direction. The gas diffuses from the center of the groove to both ends and communicates with the connecting passages in the connection section through the first and second openings. As shown in Figure 8, the arrows in the figure indicate the gas flow direction. The gas diffuses from the groove through the first opening, exits the first opening, and then diffuses from the middle of the first opening into the first and second connecting passages on both sides. In this way, the gas diffusion distance is short and the gas has a specific diffusion direction, so that the gas can be discharged to the outside of the battery pack more quickly and the safety of the battery pack can be better guaranteed.

[0039] In one embodiment of the present application, the first connecting passage 321 and the third connecting passage 331 communicate to form an integrated passage, and the second connecting passage 322 and the fourth connecting passage 332 communicate to form an integrated passage. In this embodiment, there is one passage on each side of the length of the modular cross beam, and these passages respectively penetrate the first connecting portion, the receiving portion, and the second connecting portion, i.e., the passages on each side are integrated. In this way, the molding structure of the modular cross beam can be simplified. Gas generated by thermal runaway can diffuse from the first or second opening and then diffuse to the left or right along the passage.

[0040] In one embodiment of the present application, the depth of the groove is 3mm to 5mm, for example, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm, and the difference between the length of the receiving base and the length of the groove is 15mm to 35mm, for example, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, and 35mm. In one embodiment of the present application, the length of the receiving base may be 580mm, and the length of the groove may be 550mm. The difference between the width of the accommodating base and the width of the groove is 15 mm to 35 mm, and may be, for example, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, 27 mm, 28 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, or 35 mm. In one embodiment of the present application, the width of the accommodating base may be 80 mm, and the length of the groove may be 50 mm. By ensuring the depth, width, and length of the groove within the above ranges, rapid gas diffusion can be ensured while minimizing the space required for the battery pack.

[0041] In one embodiment of the present application, the bottom of the module cross beam 3 is connected to the liquid-cooled plate 4 via a thermally conductive structural adhesive 34. The thermally conductive structural adhesive 34 can firmly connect the liquid-cooled plate 4 to the module cross beam, while also allowing the temperature of gases generated by thermal runaway to be exchanged with the liquid-cooled plate as quickly as possible, thereby lowering the temperature. In other words, the function of the thermally conductive structural adhesive 34 is to ensure the connection between the module cross beam and the liquid-cooled plate, and to transfer the temperature to the liquid-cooled plate as quickly as possible to lower the temperature.

[0042] In one embodiment of the present application, the module cross beams 3 are made of metal, for example, aluminum alloy, which reduces the weight of the entire battery pack.

[0043] A second aspect of the present application provides a battery pack. As shown in Figure 1, the battery pack includes a cell module 1 and the battery housing according to the first aspect.

[0044] In one embodiment of the present application, as shown in Figures 3 and 4, the cell module 1 includes a plurality of cells 11, a pre-positioning bracket 12, and a housing 13, the bottom of the housing 13 is open, the pre-positioning bracket 12 is fastened to the opening at the bottom of the housing 13 to form an accommodating space for accommodating the cells, the cells 11 are located in the accommodating space, and a plurality of cell positioning portions 121 are provided on the side of the pre-positioning bracket 12 located in the accommodating space, and the plurality of cells 11 are respectively provided in the cell positioning portions 121.

[0045] In one embodiment of the present application, as shown in Figures 3 and 4, the cell module 1 further includes a positive electrode connection sheet 14 and a negative electrode connection sheet 15, which are respectively located on the other side of the pre-positioning bracket 12 and are insulated from each other, and a through-groove 122 is provided on the bottom wall of the cell positioning portion 121, and the positive electrode or negative electrode of the cell 11 is connected to the positive electrode connection sheet 14 or the negative electrode connection sheet 15 through the through-groove 122.

[0046] In one embodiment of the present application, as shown in Figures 3 and 4, a potting material 16 is filled between the cells 11, the housing 13, the pre-positioning bracket 12, the positive electrode connection sheet 14, and the negative electrode connection sheet 15, and the potting material 16 seals and fixedly connects the multiple cells 11, the housing 13, the pre-positioning bracket 12, the positive electrode connection sheet 14, and the negative electrode connection sheet 15.

[0047] In this application, the assembly process for the cell module 1 involves first initially fixing the cells 11 in the pre-positioning brackets 12 using the cell positioning portions 121, then connecting the positive and negative electrodes of the batteries to the positive and negative electrode connection sheets through the through-slots, respectively, and then injecting a potting agent into the housing. As shown in Figures 5 and 6, the gaps between the housing, cells, pre-positioning brackets 12, positive and negative electrode connection sheets 14 and 15 are filled with the potting agent to fix them together, forming the cell module 1 with an integrated structure.

[0048] 3, a rectangular adhesive-resistant foam cotton 17 is provided between the cell module 1 and the module cross beam 3, and a step portion 311 is provided around the groove 312 in the storage portion, and the shape of the rectangular adhesive-resistant foam cotton 17 matches the step portion 311, and the rectangular adhesive-resistant foam cotton 17 is attached to the step portion 311. In other words, the shape and size of the rectangular opening of the rectangular adhesive-resistant foam cotton 17 are the same as those of the opening of the groove 312, so that the groove 312 is exposed from the rectangular adhesive-resistant foam cotton 17.

[0049] In one embodiment of the present application, when the cell module is placed within the module cross beam, the cell module as a whole is attached to the step portion together with rectangular adhesive-resistant foam cotton, and the rectangular opening of the rectangular adhesive-resistant foam cotton corresponds to the opening of the groove. Therefore, when the potting agent is subsequently filled into the battery pack, the rectangular adhesive-resistant foam cotton prevents the potting agent from entering the groove, which is convenient for the high-temperature, high-pressure gas to quickly diffuse into the groove in the event of subsequent thermal runaway.

[0050] In one embodiment of the present application, the cell module is at least one of a ternary lithium cell module and a polymer lithium cell module. The cell module is configured by connecting a plurality of cells, and the cells are cylindrical batteries or pouch batteries.

[0051] In one embodiment of the present application, the cell module is provided with a relief valve, and the relief valve is provided facing the recessed groove. When the cell module generates high-temperature gas due to thermal runaway, the high-temperature gas passes through the relief valve and enters the recessed groove.

[0052] A third aspect of the present application provides a vehicle, including the battery pack of the first aspect. For example, the vehicle may be a pure electric vehicle or a hybrid vehicle, such as a passenger car, bus, or truck, and the present application improves safety during use of the vehicle.

[0053] In the above embodiments, the differences between each embodiment are described in detail. The different optimal features between each embodiment can be combined to form a more preferred embodiment, unless they are contradictory, and for the sake of brevity, the description will be omitted here.

[0054] Although some specific embodiments of the present application have been described in detail using examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. Those skilled in the art should understand that modifications to the above embodiments can be made without departing from the scope and spirit of the present application. The scope of the present application is limited by the appended claims. [Explanation of symbols]

[0055] 1 cell module 11 cells 12 Pre-positioning bracket 121 Cell positioning unit 122 Through groove 13. Housing 14 Positive electrode connection sheet 15 Negative electrode connection sheet 16 Potting agent 17 rectangular adhesive-resistant foam pads 2 trays 21 1st aisle 22 Explosion-proof valve 3-module horizontal beam 31 Storage unit 311 Step 312 Groove 3121 First Opening 3122 Second Opening 32 First connection part 321 First connecting passage 322 Second connecting passage 323 1st communication port 33 Second connection part 331 Third connecting passage 332 4th connecting passage 333 2nd communication port 34 Thermally conductive structural adhesive 4 Liquid cooling plate

Claims

1. A battery housing including a tray (2), at least one module cross beam (3), and a liquid cooling plate (4), A first passage (21) is formed in the tray (2), and an explosion-proof valve (22) is provided in the tray (2), and the first passage (21) communicates with the explosion-proof valve (22); The module cross beams (3) are provided in the trays (2), and the module cross beams (3) have storage sections (31) capable of storing cell modules (1), and the bottoms of at least some of the storage sections (31) are recessed downward to form grooves (312) capable of storing gas, and an opening is provided at at least one end of the grooves (312) along the longitudinal direction of the module cross beams (3); The liquid cooling plate (4) is sealed and connected to the bottom outside of the module cross beam (3), at least one connecting passage is formed between the liquid cooling plate (4) and the module cross beam (3), and the opening communicates with the first passage (21) through the connecting passage.

2. The module cross beam (3) includes a first connecting portion (32) and a second connecting portion (33), the first connecting portion (32), the storage portion (31) and the second connecting portion (33) are fixedly connected in order, and the first connecting portion (32) and the second connecting portion (33) are respectively connected to the tray (2); The groove (312) has a first opening (3121) and a second opening (3122) at both ends along the longitudinal direction of the module cross beam (3), respectively; A second passage is formed between the first connection portion (32) and the liquid cooling plate (4) along the longitudinal direction of the module cross beam (3), and a third passage is formed between the second connection portion (33) and the liquid cooling plate (4) along the longitudinal direction of the module cross beam (3). The battery housing of claim 1, wherein one end of the second passage is connected to the first opening (3121) and one end of the third passage is connected to the second opening (3122).

3. 3. The battery housing according to claim 2, wherein the first connecting portion (32) and the second connecting portion (33) are provided with a first communication port (323) and a second communication port (333), respectively, the other end of the second passage communicates with one end of the first communication port (323), the other end of the third passage communicates with one end of the second communication port (333), and the other end of the first communication port (323) and the other end of the second communication port (333) each communicate with the first passage (21).

4. The second passage includes a first connecting passage (321) and a second connecting passage (322) provided on both sides in the longitudinal direction of the module cross beam (3), and the third passage includes a third connecting passage (331) and a fourth connecting passage (332) provided on both sides in the longitudinal direction of the module cross beam (3), One end of the first connecting passage (321) and one end of the second connecting passage (322) are each connected to the first opening (3121), one end of the third connecting passage (331) and one end of the fourth connecting passage (332) are each connected to the second opening (3122), and the first connecting portion (32) and the second connecting portion (33) are provided with a first communicating port (323) and a second communicating port (333), respectively, and the first connecting passage (321) and the second connecting portion (33) are each provided with a second communicating port (333).

3. The battery housing according to claim 2, wherein the other end of the third connecting passage (331) and the other end of the second connecting passage (322) are connected to one end of the first connecting port (323), the other end of the third connecting passage (331) and the other end of the fourth connecting passage (332) are connected to one end of the second connecting port (333), and the other end of the first connecting port (323) and the other end of the second connecting port (333) are each connected to the first passage (21).

5. 5. The battery housing according to claim 4, wherein the first connecting passage (321) and the third connecting passage (331) communicate with each other to form an integrated passage, and the second connecting passage (322) and the fourth connecting passage (332) communicate with each other to form an integrated passage.

6. 2. The battery housing according to claim 1, wherein the depth of the groove (312) is 3 mm to 5 mm, the difference between the length of the accommodating base and the length of the groove (312) is 15 mm to 35 mm, and the difference between the width of the accommodating base and the width of the groove (312) is 15 mm to 35 mm.

7. 2. The battery housing according to claim 1, wherein the bottom of the module cross beam (3) is connected to the liquid cooling plate (4) via a thermally conductive structural adhesive (34).

8. 2. The battery housing according to claim 1, wherein the module cross beams (3) are metal members.

9. 9. The battery housing according to claim 8, wherein the module cross beam (3) is made of an aluminum alloy material.

10. A battery pack including a cell module (1) and a battery housing, The battery housing includes a tray (2), at least one module cross beam (3), and a liquid cooling plate (4); A first passage (21) is formed in the tray (2), and an explosion-proof valve (22) is provided in the tray (2), and the first passage (21) communicates with the explosion-proof valve (22); The module cross beam (3) is provided in the tray (2), and the module cross beam (3) has a storage section (31) therein, and at least a part of the bottom of the storage section (31) is recessed downward to form a groove (312) capable of storing gas, and an opening is provided at at least one end of the groove (312) along the length direction of the module cross beam (3); The liquid cooling plate (4) is sealed and connected to the bottom outside of the module cross beam (3), and at least one connecting passage is formed between the liquid cooling plate (4) and the module cross beam (3), and the opening communicates with the first passage (21) through the connecting passage; The battery pack is characterized in that the cell module (1) is placed in the storage section (31).

11. 11. The battery pack of claim 10, wherein the cell module (1) includes a plurality of cells (11), a pre-positioning bracket (12), and a housing (13), the bottom of the housing (13) is open, the pre-positioning bracket (12) stops at the opening in the bottom of the housing (13) to form an accommodating space for accommodating the cells (11), and a plurality of cell positioning portions (121) are provided on one side of the pre-positioning bracket (12) located within the accommodating space, and the plurality of cells (11) are respectively provided in the plurality of cell positioning portions (121).

12. 12. The battery pack of claim 11, wherein the cell module (1) further includes a positive electrode connection sheet (14) and a negative electrode connection sheet (15), the positive electrode connection sheet (14) and the negative electrode connection sheet (15) being respectively located on both sides of the pre-positioning bracket (12) and insulated from each other, the bottom wall of the cell positioning portion (121) being provided with a through-groove (122), and the positive electrode or the negative electrode of the cell (11) being connected to the positive electrode connection sheet (14) or the negative electrode connection sheet (15) through the through-groove (122).

13. 13. The battery pack according to claim 12, wherein a potting material (16) is filled between the cell (11), the housing (13), the pre-positioning bracket (12), the positive electrode connection sheet, and the negative electrode connection sheet (15), and the potting material (16) seals and fixedly connects the cell (11), the housing (13), the pre-positioning bracket (12), the positive electrode connection sheet, and the negative electrode connection sheet (15).

14. The battery pack of claim 13, characterized in that a rectangular adhesive-resistant foam cotton (17) is provided between the cell module (1) and the module cross beam (3), the storage section (31) has a step portion (311) around the groove (312), the shape of the rectangular adhesive-resistant foam cotton (17) matches the step portion (311), and the rectangular adhesive-resistant foam cotton (17) is in contact with the step portion (311).

15. The battery pack according to claim 14, wherein the rectangular opening of the rectangular adhesive-resistant foam cotton (17) corresponds to the opening of the recess (312).

16. The battery pack according to any one of claims 10 to 15, characterized in that the cell module (1) is at least one of a ternary lithium cell module and a polymer lithium cell module.

17. The battery pack according to any one of claims 11 to 15, wherein the cells (11) are cylindrical batteries or pouch batteries.

18. The battery pack according to any one of claims 11 to 15, characterized in that the cell module (1) is provided with a relief valve, and the relief valve is provided facing the recessed groove (312).

19. A vehicle comprising the battery pack according to any one of claims 10 to 15.

20. 20. The vehicle of claim 19, wherein the vehicle is a pure electric vehicle or a hybrid vehicle.

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