Box girder, battery box and battery pack

Abstract

The application discloses a box beam, a battery box and a battery pack, and belongs to the technical field of immersed battery cooling. The box beam has a flow channel group and a flow collecting cavity. The flow channel group comprises a plurality of liquid flow channels and a plurality of liquid distribution ports. The liquid flow channels extend from the flow collecting cavity along the length direction of the box beam. The lengths of the plurality of liquid flow channels are different from each other. The liquid flow channels with different lengths and the liquid distribution ports with different areas are arranged. The area of the liquid distribution port increases with the increase of the length of the liquid flow channel. The liquid distribution port far from the flow collecting cavity can output a large flow of cooling liquid. The liquid distribution port close to the flow collecting cavity outputs cooling liquid quickly. When the box beam is used for cooling the batteries in the battery pack, the batteries far from the flow collecting cavity and the batteries close to the flow collecting cavity can be immersed in cooling liquid with substantially the same flow, so that the temperature of the batteries at different positions changes uniformly.

Description

Technical Field

[0001] This application belongs to the field of immersion battery cooling technology, and specifically relates to a box beam, battery box and battery pack. Background Technology

[0002] During high-rate charging, batteries generate a significant amount of heat. To dissipate this heat, cooling is necessary. Currently, most immersion cooling solutions for battery packs employ a channel design for the coolant flowing into the pack. However, this design suffers from uneven coolant distribution within the pack, resulting in inconsistent temperature distribution across different battery locations. Utility Model Content

[0003] The purpose of this utility model is to provide a box beam to overcome the technical problem of poor temperature uniformity of batteries in different positions within a battery pack; another purpose of this application is to provide a battery box; a third purpose of this application is to provide a battery pack.

[0004] Technical solution: The box girder described in this application embodiment has a flow channel assembly and a confluence cavity, wherein the flow channel assembly includes:

[0005] Multiple liquid flow channels and multiple liquid distribution ports are provided. The liquid flow channels extend from the manifold along the length of the box beam. The lengths of the multiple liquid flow channels are different from each other. The multiple liquid distribution ports are located on the same side of the width direction of the box beam, and each liquid distribution port is connected to one of the liquid flow channels.

[0006] Along the length direction, a plurality of the liquid distribution ports are arranged sequentially, and the opening area increases in the direction away from the manifold.

[0007] In some embodiments, the box beam includes multiple flow channel groups, which are spaced apart along the width direction of the box beam, and the lengths of the multiple flow channel groups decrease or increase. Multiple liquid flow channels in each flow channel group are spaced apart along the height direction of the box beam, and each liquid outlet is located at the end of a liquid flow channel away from the manifold.

[0008] In some embodiments, along the height direction, the lengths of the plurality of liquid flow channels in the same flow channel group increase or decrease, and the cross-sectional areas of the plurality of liquid flow channels in the same flow channel group increase or decrease.

[0009] In some embodiments, the total area of ​​the plurality of liquid flow channels in each flow channel group decreases along the orientation of the liquid outlet.

[0010] In some embodiments, the box beam has at least one first channel, and the box beam further includes at least one partition, wherein at least one partition is disposed within the first channel for dividing the first channel into a plurality of liquid flow channels;

[0011] The box beam includes multiple sealing components, which are connected to the partition plate and are used to seal the liquid flow channel.

[0012] This application embodiment also provides a battery box, including:

[0013] The box-shaped enclosure has a receiving cavity;

[0014] The box beam as described in any one of the above descriptions is provided. There are two box beams, which are located on both sides of the box along the width direction and connected to the box. The liquid outlet of the box beam is connected to the receiving cavity.

[0015] In some embodiments, the battery box further includes:

[0016] Multiple crossbeams are located within the receiving cavity and connected to the box body. The multiple crossbeams are arranged at intervals along the length direction, dividing the receiving cavity into multiple placement cavities. Each flow channel group of the box body beams is connected to one of the placement cavities.

[0017] This application embodiment also provides a battery pack, including:

[0018] The battery box as described in any one of the above statements;

[0019] A battery pack, wherein the battery pack is disposed within the receiving cavity of the battery box.

[0020] In some embodiments, the battery pack further includes:

[0021] A limiting frame is located within the receiving cavity and connected to the battery box. The limiting frame has an installation space, and the battery pack is disposed within the installation space. Both sides of the battery pack along the length direction and both sides along the width direction are connected to the limiting frame.

[0022] The limiting frame has openings on both sides that communicate with the installation space, and the openings are connected to the liquid outlet of the battery box.

[0023] In some embodiments, the battery pack includes a plurality of battery cells arranged along the length direction, and the battery cell includes a plurality of individual cells arranged along the width direction; the battery pack further includes:

[0024] Multiple spacers are located between two adjacent battery cells and are respectively connected to the two adjacent battery cells to form a current-passing gap between the two adjacent battery cells;

[0025] Multiple insulating elements are located between two adjacent individual cells and are respectively connected to the two adjacent individual cells.

[0026] Beneficial Effects: The box beam of this embodiment has a flow channel group and a manifold. The flow channel group includes multiple liquid flow channels and multiple liquid outlets. The liquid flow channels extend from the manifold along the length of the box beam, and the lengths of the multiple liquid flow channels are different from each other. The multiple liquid outlets are arranged on the same side of the width direction of the box beam, and each liquid outlet is connected to a liquid flow channel. Along the length direction, the multiple liquid outlets are arranged sequentially, and the opening area increases in the direction away from the manifold. By setting liquid flow channels of different lengths and liquid outlets of different areas, the area of ​​the liquid outlets increases with the increase of the length of the liquid flow channels. The liquid outlets farther from the manifold can output a larger flow rate of coolant, and the liquid outlets closer to the manifold output coolant faster. When the box beam cools the batteries in the battery pack, the batteries farther from the manifold and the batteries closer to the manifold can be immersed in approximately the same flow rate of coolant, so that the temperature change of the batteries at different positions is consistent. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a front sectional view of the box girder in an embodiment of this application;

[0029] Figure 2 Examples of this application Figure 1 Enlarged view of area A in the middle;

[0030] Figure 3 This is a side sectional view of a box beam according to an embodiment of this application, wherein a flow channel assembly is provided;

[0031] Figure 4 This is a perspective view of a box beam according to an embodiment of this application, wherein it has a flow channel assembly;

[0032] Figure 5 This is a side sectional view of a box beam according to an embodiment of this application, which has multiple flow channel groups;

[0033] Figure 6This is a perspective view of a box girder according to an embodiment of this application, wherein it has multiple flow channel groups;

[0034] Figure 7 This is a top sectional view of the box girder in an embodiment of this application;

[0035] Figure 8 Examples of this application Figure 7 Enlarged view of area B in the middle;

[0036] Figure 9 Examples of this application Figure 7 Enlarged view of area C;

[0037] Figure 10 Examples of this application Figure 7 Enlarged view of area D in the middle;

[0038] Figure 11 This is a perspective view of the battery box according to an embodiment of this application;

[0039] Figure 12 This is a perspective view of the battery pack according to an embodiment of this application;

[0040] Figure 13 This is a schematic diagram of the exploded structure of the battery pack according to an embodiment of this application;

[0041] Figure 14 This is a schematic diagram of the battery pack, limiting frame, spacer and insulating component in an embodiment of this application;

[0042] Figure 15 This is a schematic diagram of the battery cell structure according to an embodiment of this application;

[0043] Figure 16 This is a schematic diagram of the structure of the battery cell and spacer in an embodiment of this application;

[0044] Explanation of reference numerals in the attached drawings: 10-Box beam; 11-Flow channel assembly; 111-Liquid flow channel; 112-Distribution port; 12-Gathering cavity; 13-First channel; 14-Baffle; 15-Sealing component; 20-Box body; 21-Receiving cavity; 211-Placement cavity; 30-Crossbeam; 40-Battery pack; 41-Battery unit; 411-Single cell; 42-Overflow gap; 50-Limiting frame; 51-Installation space; 52-Opening; 60-Spacer; 70-Insulating component; X-Length direction; Y-Width direction; Z-Height direction. Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified.

[0047] During high-rate charging, batteries generate a significant amount of heat. To dissipate this heat, cooling is necessary. Currently, cooling channels are incorporated within the battery pack for cooling. However, most of these designs lack specific inlet and outlet designs for the coolant, instead focusing on channels between the batteries. This approach makes it difficult to distribute the coolant flow evenly among the batteries. In existing technology, the coolant enters the battery pack from the inlet and spreads in a specific direction, immersing and cooling batteries at different locations sequentially. During this process, the coolant temperature gradually increases, resulting in poor cooling for batteries farther from the inlet. This leads to uneven cooling, with batteries closer to the inlet experiencing lower temperatures and those farther away experiencing higher temperatures, resulting in poor temperature uniformity. This design is not ideal for immersion batteries and does not provide adequate cooling.

[0048] In view of this, embodiments of this application provide a box girder to overcome at least one of the above-mentioned technical problems.

[0049] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 In this embodiment, the box beam 10 has a flow channel assembly 11 and a manifold 12. The flow channel assembly 11 includes multiple liquid flow channels 111 and multiple liquid outlets 112. The multiple liquid flow channels 111 extend from the manifold 12 along the length direction X of the box beam 10 and communicate with the manifold 12. The lengths of the multiple liquid flow channels 111 are different from each other. The multiple liquid outlets 112 are located on the same side of the width direction Y of the box beam 10, and each liquid outlet 112 communicates with one liquid flow channel 111. Along the length direction X, the multiple liquid outlets 112 are arranged sequentially, and along the direction away from the manifold, the opening area of ​​the multiple liquid outlets 112 increases.

[0050] It is understandable that the battery pack 40 is installed inside the battery box housing 20 (e.g., Figure 13 As shown), to better cool the individual cells 411 inside the battery pack, the structure of the battery box beam 10 can be improved. For example... Figure 1 As shown, a manifold 12 is provided at one end of the box beam 10 along the length direction X. The pipe for supplying coolant from the outside can be connected to the manifold 12, so that the coolant can enter the interior of the manifold 12. At the same time, a flow channel group 11 is also provided inside the box beam 10. The flow channel group 11 includes multiple liquid flow channels 111. Each liquid flow channel 111 is connected to the manifold 12, so that the coolant in the manifold 12 can enter the interior of each liquid flow channel 111. Each liquid flow channel 111 in the flow channel group 11 has a different length (length refers to the dimension of the liquid flow channel 111 in the length direction X), and each liquid flow channel 111 is connected to a liquid distribution port 112. Multiple liquid distribution ports 112 are arranged on the same side of the box beam 10 in the width direction Y. When the battery pack is installed, this side of the box beam 10 is arranged to face the battery. The coolant entering the liquid flow channel 111 from the manifold 12 can be discharged from the liquid distribution port 112, so that the coolant can flow to the battery at the corresponding position, so that the battery at the corresponding position is immersed in the coolant. In the field of immersion battery, the cooling effect of the battery can be improved.

[0051] Multiple coolant outlets 112 are arranged sequentially along the length direction X. During battery pack assembly, the batteries placed inside are generally also arranged along the length direction X. This allows the multiple coolant outlets 112 arranged in the same direction to correspond to batteries at different positions along the length direction X, delivering coolant to batteries at different positions through different fluid flow channels 111 and outlets 112. The coolant temperature contacted by batteries at different positions is the same, as it has not been heated by other batteries, resulting in a lower temperature and better cooling effect on batteries at all positions. This effectively ensures temperature consistency among batteries at different positions and improves the thermal management performance of the batteries. Meanwhile, along the length direction X, and in the direction away from the manifold 12, the area of ​​the multiple liquid distribution ports 112 increases progressively. That is, the liquid distribution port 112 connected to the longer liquid flow channel 111 has a larger area, and the larger liquid distribution port 112 is further away from the manifold 12; the liquid distribution port 112 connected to the shorter liquid flow channel 111 has a smaller area, and the smaller liquid distribution port 112 is further away from the manifold 12. This creates a structure where the area of ​​the multiple liquid distribution ports 112 increases progressively along the length direction X, and in the direction away from the manifold 12. As the distance from the manifold 12 increases, the larger liquid distribution port 112 can compensate for the pressure loss of the liquid in the longer liquid flow path, ensuring sufficient flow to the area away from the manifold 12. Furthermore, by rationally setting the area and position of each liquid distribution port 112, each liquid flow channel 111 receives an appropriate amount of cooling liquid, ensuring the uniformity of the cooling liquid flow and preventing overheating or insufficient cooling in certain areas.

[0052] Please see Figure 5 In conjunction with the above embodiments, in some embodiments, the box beam 10 includes multiple flow channel groups 11. Along the width direction Y of the box beam 10, the multiple flow channel groups 11 are arranged at intervals, and the length of the multiple flow channel groups 11 decreases or decreases. Further, along the orientation of the liquid outlet 112, the length of the multiple flow channel groups 11 decreases. Multiple liquid flow channels 111 in each flow channel group 11 are arranged at intervals along the height direction Z of the box beam 10. Each liquid outlet 112 is located at the end of a liquid flow channel 111 away from the manifold 12.

[0053] Understandably, multiple flow channel groups 11 can be set on the box beam 10, each with a different length. Therefore, different flow channel groups 11 can deliver coolant to different locations, increasing the range of coolant delivery. Simultaneously, each flow channel group 11 includes multiple liquid flow channels 111 of varying lengths. Since each distributor port 112 is located at the end of a liquid flow channel 111 furthest from the manifold 12, the coolant output from each distributor port 112 flows to batteries in different locations. Therefore, when different flow channel groups 11 deliver coolant to different locations, the liquid flow channels 111 on each flow channel group 11 can further refine the coolant delivery location, delivering coolant to different areas at corresponding locations, allowing the coolant to immerse and cool batteries in different areas. The coolant can cool batteries in specific areas; a given volume of coolant only needs to cool an appropriate number of batteries, ensuring consistent cooling across that number of batteries and preventing large temperature differences between them.

[0054] Please see Figure 4 and Figure 5 In conjunction with the above embodiments, in some embodiments, along the height direction Z, the length of multiple liquid flow channels 111 in the same flow channel group 11 increases or decreases, and the cross-sectional area of ​​multiple liquid flow channels 111 in the same flow channel group 11 increases or decreases.

[0055] It is understandable that when multiple flow channel groups 11 are set on the box beam 10, along the height direction Z, the length of multiple liquid flow channels 111 on each flow channel group 11 can be increased or decreased sequentially (the increase or decrease of the length of multiple liquid flow channels 111 depends on the specific direction of the height direction Z. If from top to bottom, the length of multiple liquid flow channels 111 in each flow channel group 11 gradually decreases; if from bottom to top, the length of multiple liquid flow channels 111 in each flow channel group 11 gradually increases). Figure 4 In this diagram, the end of the liquid distribution port 112 that is furthest from the manifold 12 is the end of the corresponding liquid flow channel 111. It can be seen that the multiple liquid flow channels 111 and the corresponding liquid distribution ports 112 in this group are arranged in a relatively neat and orderly manner, which is conducive to the setting and connection of the corresponding structures on the box beam 10 and avoids the liquid distribution ports 112 being set up in a chaotic manner, which would cause some structures inside the battery pack to be unable to be connected to the box beam 10.

[0056] Furthermore, the cross-sectional area of ​​multiple fluid channels 111 within the same flow channel group 11 increases or decreases progressively, and this increase or decrease is related to their length. A longer fluid channel 111 has a larger cross-sectional area, and a shorter fluid channel 111 has a smaller cross-sectional area. This structure allows more coolant to flow through the longer fluid channels 111 due to their larger cross-sectional area. Although the longer flow channel encounters more resistance, the larger flow rate still ensures uniformity, ensuring that batteries farther from the manifold 12 receive approximately the same amount of coolant as batteries closer to the manifold 12.

[0057] Please see Figure 5 and Figure 6 In conjunction with the above embodiments, in some embodiments, the total area of ​​the plurality of liquid flow channels 111 in each flow channel group 11 decreases along the orientation of the liquid outlet 112.

[0058] It is understandable that when multiple flow channel groups 11 are set on the box beam 10, the length of the flow channel group 11 gradually decreases along the direction of the liquid distribution port 112, so the distance of coolant flow gradually decreases. In order to ensure the uniformity of coolant flow over a long distance, the flow rate of coolant passing through the longer flow channel group 11 needs to be relatively large. This purpose can be achieved by changing the total area of ​​the multiple liquid flow channels 111 in the flow channel group 11. Therefore, by gradually reducing the total area of ​​the multiple liquid flow channels 111 in each flow channel group 11 along the orientation of the liquid distribution port 112, the flow rate through the flow channel groups 11 of different lengths can be different. The flow rate of coolant passing through the longer flow channel group 11 is larger, and the flow rate of coolant passing through the shorter flow channel group 11 is smaller (although the flow rate is smaller, because the distance is shorter, more coolant can be output in a shorter time). This makes the amount of coolant contacted by the battery that is farther away from the manifold 12 about the same as the amount of coolant contacted by the battery that is closer to the manifold 12.

[0059] Please see Figure 3 and Figure 5 In conjunction with the above embodiments, in some embodiments, the box beam 10 has at least one first channel 13, and the box beam 10 further includes at least one partition 14, which is disposed within the first channel 13 to divide the first channel 13 into multiple liquid flow channels 111. The box beam 10 includes multiple sealing members 15, which are connected to the partition 14 to seal the liquid flow channels 111.

[0060] Understandably, at least one first channel 13 can be provided on the box beam 10. If only one flow channel group 11 is provided on the box beam 10, then only one first channel 13 needs to be provided. If multiple flow channel groups 11 are provided, then the box beam 10 needs to provide the same number of first channels 13 as the flow channel groups 11. The function of the first channel 13 is to form multiple liquid flow channels 111. At least one baffle 14 can be provided inside the first channel 13. The baffle 14 can divide the first channel 13 into multiple regions along the height direction Z, and each region is a liquid flow channel 111. The number of liquid flow channels 111 is determined by the number of baffles 14. Changing the number of baffles 14 as needed can change the number of liquid flow channels 111 in each flow channel group 11. Of course, the channels in the box beam 10 can also be formed by extruding profiles, which is simple and convenient to process.

[0061] Multiple sealing components 15 can also be installed inside the first channel 13, such as Figure 7 , Figure 8 , Figure 9 and Figure 10 As shown, taking three flow channel groups 11 as an example, as follows: Figure 8 As shown, a sealing element 15 is installed at the position of one of the liquid distribution ports 112 on the shortest flow channel group 11. The sealing element 15 can block and isolate the liquid flow channel 111 connected to the liquid distribution port 112, so that the coolant flowing along the liquid flow channel 111 is discharged from the position of the liquid distribution port 112 and does not need to continue flowing, thus avoiding the waste of some coolant. Similarly, as Figure 9 As shown, a sealing element 15 is installed at the position of one of the liquid distribution ports 112 on the middle flow channel group 11. This sealing element can block other liquid flow channels 111 at the position of the liquid distribution port 112, ensuring that the liquid distribution port 112 only needs to communicate with the corresponding liquid flow channel 111 on the middle flow channel group 11. This prevents the coolant output from the liquid distribution port 112 from entering other liquid flow channels 111, thus avoiding the loss of some coolant. Figure 10 As shown, a sealing element 15 is also provided at the position of one of the liquid outlets 112 on the longest flow channel group 11. This can block other liquid flow channels 111 at the position of the liquid outlet 112, so that the liquid outlet 112 only needs to be connected to the corresponding liquid flow channel 111 on the longest flow channel group 11, preventing the coolant output from the liquid outlet 112 from entering other liquid flow channels 111. Similarly, if the number of flow channel groups 11 on the box beam 10 increases, a sealing element 15 is also provided at the position of the liquid outlet 112 corresponding to the increased flow channel group 11, so that the liquid outlet 112 only communicates with the corresponding liquid flow channel 111, and the coolant in the liquid flow channel 111 is discharged at the liquid outlet 112.

[0062] Please see Figure 11In conjunction with the above embodiments, this application also provides a battery box, including a box body 20 and the aforementioned box body beams 10, wherein the number of box body beams 10 is two.

[0063] The box body 20 has a receiving cavity 21. Two box body beams 10 are located on both sides of the box body 20 along the width direction Y and are connected to the box body 20. The liquid outlet 112 of the box body beam 10 is connected to the receiving cavity 21.

[0064] It is understood that box beams 10 are connected to both sides of the box body 20 along the width direction Y, so that the liquid distribution ports 112 on the box beams 10 are connected to the receiving cavity 21 inside the box body 20. The receiving cavity 21 is used to accommodate batteries. The coolant flowing in the liquid flow channel 111 can enter the receiving cavity 21 through the corresponding liquid distribution ports 112, which can immerse the batteries contained therein. Since multiple liquid distribution ports 112 are provided on the side of the box beams 10 facing the batteries, and the multiple liquid distribution ports 112 are arranged sequentially along the length direction X, each liquid distribution port 112 can deliver coolant to batteries at different positions in the receiving cavity 21, which can cool batteries at different positions, ensure the temperature uniformity of the batteries, and improve the cooling effect.

[0065] Of the two box beams 10, one box beam 10 is used as an inlet beam. The liquid flow channel 111 and the corresponding liquid distribution port 112 on the inlet beam deliver coolant to the interior of the receiving cavity 21, so that the battery in the receiving cavity 21 can be immersed in the coolant. The other box beam 10 is used as an outlet beam. The receiving cavity 21 is connected to the corresponding liquid distribution port 112 on the outlet beam, so that the coolant in the receiving cavity 21 can enter the liquid distribution port 112 on the outlet beam and then be discharged through the corresponding connected liquid flow channel 111 on the outlet beam. During the installation process, the inlet beam and outlet beam are spaced apart along the width direction Y. The liquid distribution port 112 on the inlet beam and the liquid distribution port 112 on the outlet beam can be set one-to-one along the width direction Y. The sizes of the corresponding liquid distribution ports 112 on the two beams can be different, which can be set as needed. For example, the area of ​​the liquid distribution port 112 on the outlet beam is larger than the area of ​​the corresponding liquid distribution port 112 on the inlet beam, or the area of ​​the liquid distribution port 112 on the outlet beam is equal to the area of ​​the corresponding liquid distribution port 112 on the inlet beam.

[0066] Please see Figure 11 In conjunction with the above embodiments, in some embodiments, the battery box further includes multiple crossbeams 30, which are located in the receiving cavity 21 and connected to the box body 20. The multiple crossbeams 30 are arranged at intervals along the length direction X, dividing the receiving cavity 21 into multiple placement cavities 211. Each flow channel group 11 of the box body beam 10 is connected to a placement cavity 211.

[0067] Understandably, multiple crossbeams 30 can be installed inside the receiving cavity 21. These crossbeams 30 can divide the receiving cavity 21 into multiple placement cavities 211. Each placement cavity 211 is isolated from each other and does not communicate with each other. Each placement cavity 211 is connected to a flow channel group 11 on the box beam 10. That is, multiple liquid outlets 112 on a flow channel group 11 are connected to a placement cavity 211. Each placement cavity 211 can hold a certain number of batteries. The arrangement direction of the batteries is the same as the arrangement direction of the corresponding liquid outlet 112. This allows the coolant output from each liquid outlet 112 to cool a specific portion of the batteries, resulting in a good cooling effect. This ensures that the temperature of each part of the batteries is consistent, avoiding uneven temperature phenomena.

[0068] Please see Figure 12 and Figure 13 In conjunction with the above embodiments, this application also provides a battery pack, including the battery box and battery pack 40, wherein the battery pack 40 is disposed in the receiving cavity 21 of the battery box.

[0069] It is understood that the battery pack 40 is housed within the receiving cavity 21 of the battery box. If there are multiple battery packs 40, each battery pack 40 can be placed in a placement cavity 211 within the receiving cavity 21, thus spacing each battery pack 40 apart. Multiple liquid distribution ports 112 connected to the placement cavity 211 are used to deliver coolant to different locations within the corresponding battery pack 40, ensuring that batteries at different locations are submerged in coolant. This improves the cooling effect on the battery pack 40, allowing the temperature of each battery in the battery pack 40 to decrease synchronously, ensuring that the battery temperatures within a battery pack 40 are approximately the same and without significant differences, thereby improving the safety performance of the battery pack.

[0070] Please see Figure 14 In conjunction with the above embodiments, in some embodiments, the battery pack further includes a limiting frame 50, which is located within the receiving cavity 21 and connected to the battery box. The limiting frame 50 has an installation space 51, within which the battery pack 40 is disposed. Both sides of the battery pack 40 along the length direction X and both sides along the width direction Y are connected to the limiting frame 50. The limiting frame 50 has openings 52 on both sides communicating with the installation space 51, and these openings 52 communicate with the liquid distribution port 112 of the battery box.

[0071] It is understood that a limiting frame 50 can be provided inside the receiving cavity 21. If the receiving cavity 21 is divided into multiple placement cavities 211, a limiting frame 50 can be provided in each placement cavity 211. The battery pack 40 can be placed in the mounting space 51 of the limiting frame 50, so that both sides of the battery pack 40 along the length direction X and both sides along the width direction Y are in contact with or abut against the limiting frame 50. The limiting frame 50 constrains the battery pack 40, so that the multiple individual batteries 411 in the battery pack 40 can be tightly connected, avoiding loosening. Openings 52 are provided on both sides of the limiting frame 50. One opening 52 faces the housing beam 10 for coolant input, and the other opening faces the housing beam 10 for coolant discharge. The two openings 52 are respectively connected to the corresponding distribution ports 112 on the housing beam 10, allowing the distribution port 112 to deliver coolant to one opening 52 into the installation space 51, and the other opening 52 to deliver coolant into the installation space 51 to the corresponding distribution port 112 for coolant discharge. The limiting frame 50 is made of epoxy resin, which has good insulation properties, preventing electrical connection between the battery pack 40 and the battery box, thus improving the safety of the battery pack.

[0072] Please see Figure 14 , Figure 15 and Figure 16 In conjunction with the above embodiments, in some embodiments, the battery pack 40 includes a plurality of battery cells 41 arranged along the length direction X, and each battery cell 41 includes a plurality of individual cells 411 arranged along the width direction Y. The battery pack also includes a plurality of spacers 60 and a plurality of insulating members 70. The plurality of spacers 60 are located between two adjacent battery cells 41 and are respectively connected to the two adjacent battery cells 41 to form a current-passing gap 42 between the two adjacent battery cells 41. The plurality of insulating members 70 are located between two adjacent individual cells 411 and are respectively connected to the two adjacent individual cells 411.

[0073] It is understood that the battery pack 40 can be composed of multiple battery cells 41 arranged along the length direction X. The large surface of the battery cell 41 faces the adjacent battery cell 41. At least one spacer 60 can be provided between two adjacent battery cells 41. The spacer 60 extends along the width direction Y to separate the two adjacent battery cells 41 (the spacer 60 is provided between two corresponding large surface areas of the battery cells), so that a flow gap 42 is formed between the two battery cells 41. The flow gap 42 extends along the width direction Y, and its extension direction is the same as the flow direction of the coolant from one housing beam 10 to another housing beam 10, which facilitates the flow of coolant in the flow gap 42, thereby removing the temperature from the large surface area of ​​the battery, so that the battery temperature drops rapidly and the cooling effect is improved. If multiple spacers 60 are provided between two adjacent battery cells 41, the multiple spacers 60 are arranged at intervals along the height direction Z.

[0074] The battery unit 41 may include multiple individual cells 411 arranged along the width direction Y. Adjacent individual cells 411 are separated by an insulating member 70. The insulating member 70 may be made of epoxy resin, which can provide good insulation between adjacent individual cells 411 in the battery unit 41 and improve the safety of the battery.

[0075] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0076] The box beam, battery box, and battery pack provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A box beam, characterized in that, The box beam (10) has a flow channel group (11) and a flow collecting cavity (12), the flow channel group (11) comprises: A plurality of liquid flow channels (111) and a plurality of liquid distribution ports (112), the liquid flow channels (111) extend from the flow collecting cavity (12) along the length direction (X) of the box beam (10), the lengths of the plurality of liquid flow channels (111) are different from each other, the plurality of liquid distribution ports (112) are arranged on the same side of the width direction (Y) of the box beam (10), and each liquid distribution port (112) is in communication with one liquid flow channel (111); Along the length direction (X), the plurality of liquid distribution ports (112) are arranged in sequence, and the opening area increases in the direction away from the flow collecting cavity.

2. The box beam of claim 1, wherein, The box beam (10) comprises a plurality of flow channel groups (11), the plurality of flow channel groups (11) are arranged in sequence along the width direction (Y) of the box beam (10), and the lengths of the plurality of flow channel groups (11) decrease or increase, the plurality of liquid flow channels (111) in each flow channel group (11) are arranged in sequence along the height direction (Z) of the box beam (10), and each liquid distribution port (112) is arranged at one end of one liquid flow channel (111) away from the flow collecting cavity (12).

3. The box beam of claim 2, wherein, Along the height direction (Z), the lengths of the plurality of liquid flow channels (111) in the same flow channel group (11) increase or decrease, and the cross-sectional areas of the plurality of liquid flow channels (111) in the same flow channel group (11) increase or decrease.

4. The box beam of claim 2, wherein, Along the direction of the liquid distribution port (112), the total area of the plurality of liquid flow channels (111) in each flow channel group (11) decreases.

5. The box beam of claim 1, wherein, The box beam (10) has at least one first channel (13), and further comprises at least one partition plate (14) arranged in the first channel (13) for separating the first channel (13) into a plurality of liquid flow channels (111). The box beam (10) comprises a plurality of blocking members (15) connected with the partition plate (14) for blocking the liquid flow channels (111).

6. A battery box characterized by The battery box comprises: A box body (20) having a containing cavity (21); The box beam (10) according to any one of claims 1 to 5, the number of the box beams (10) is two, the two box beams (10) are respectively arranged on the two sides of the box body (20) along the width direction (Y) and are connected with the box body (20), and the liquid distribution ports (112) of the box beams (10) are in communication with the containing cavity (21).

7. The battery pack of claim 6, wherein, The battery box further comprises: A plurality of cross beams (30) arranged in the containing cavity (21) and connected with the box body (20), the plurality of cross beams (30) are arranged in sequence along the length direction (X) and separate the containing cavity (21) into a plurality of placing cavities (211), and each flow channel group (11) of the box beam (10) is in communication with one placing cavity (211).

8. A battery pack, characterized by, The battery box comprises: The battery box according to any one of claims 6 and 7. A battery pack (40) is arranged in the accommodating cavity (21) of the battery box.

9. The battery pack of claim 8, wherein, The battery pack further comprises: A limiting frame (50) is arranged in the accommodating cavity (21) and connected with the battery box, the limiting frame (50) has a mounting space (51), the battery pack (40) is arranged in the mounting space (51), and the battery pack (40) is connected with the limiting frame (50) on both sides in the length direction (X) and on both sides in the width direction (Y); Both sides of the limiting frame (50) have openings (52) in communication with the mounting space (51), and the openings (52) are in communication with the distribution ports (112) of the battery box.

10. The battery pack of claim 8, wherein, The battery pack (40) comprises a plurality of battery units (41) arranged in the length direction (X), and each battery unit (41) comprises a plurality of single batteries (411) arranged in the width direction (Y); the battery pack further comprises: A plurality of spacing pieces (60) are arranged between and connected with two adjacent battery units (41) to form an overcurrent gap (42) between the two adjacent battery units (41); A plurality of insulation pieces (70) are arranged between and connected with two adjacent single batteries (411).

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