Battery pack box body and battery pack

Abstract

The utility model discloses a battery pack box body and a battery pack, the battery pack box body comprises a box shell, a bottom plate, a liquid cooling assembly and an air cooling assembly, the box shell forms an accommodating cavity for placing a single battery; the bottom plate is connected with the box shell and seals the containing cavity, the bottom plate comprises a first bottom plate body, a second bottom plate body and a third bottom plate body which are connected with one another, and the first bottom plate body, the second bottom plate body and the third bottom plate body are sequentially arranged in the direction away from the containing cavity; a flow channel used for containing cooling liquid is formed between the first bottom plate and the second bottom plate, and a first air channel used for being communicated with the containing cavity is formed between the second bottom plate and the third bottom plate. The liquid cooling assembly comprises a liquid inlet pipe and a liquid outlet pipe which are connected to the bottom plate; the air cooling assembly comprises a first fan and a second fan which are arranged at the two ends of the air channel correspondingly, and the rotating directions of the first fan and the second fan are opposite. While the heat dissipation performance is ensured, an air inlet and an air outlet do not need to be formed in the box shell or the bottom plate, and it is ensured that the battery pack can still operate safely in the severe environment.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery pack box body and a battery pack. Background Art

[0002] With the rapid development of energy storage devices, as a core component, the heat problem generated by the battery pack during operation has attracted increasing attention. The current battery pack heat dissipation technologies mainly adopt methods such as air cooling and liquid cooling. However, in a humid and high-salinity application environment, the liquid cooling system is prone to potential risks such as condensation, resulting in the condensation of the coolant when the temperature difference is large, thereby affecting the system stability. At the same time, the air cooling system is likely to allow gases, moisture, salts, and other corrosive substances in the external environment to enter the inside of the battery pack, which may cause problems such as corrosion and performance degradation of the battery pack. These environmental factors significantly increase the battery pack failures and safety hazards, restricting the application of existing heat dissipation technologies under harsh conditions. Summary of the Utility Model

[0003] An object of the utility model is to provide a battery pack box body and a battery pack, aiming to solve the technical problem of heat dissipation of the battery pack in a humid and high-salinity application environment.

[0004] To achieve the above object, a solution provided by the utility model is: a battery pack box body and a battery pack, characterized in that it includes: a box shell, the box shell is formed with a receiving cavity for placing monomer batteries; a bottom plate, the bottom plate is connected to the box shell and seals the receiving cavity, the bottom plate includes a first bottom plate, a second bottom plate and a third bottom plate that are connected to each other, and the first bottom plate, the second bottom plate and the third bottom plate are arranged in sequence along the direction away from the receiving cavity; a flow channel for accommodating coolant is formed between the first bottom plate and the second bottom plate, and a first air duct for communicating with the receiving cavity is formed between the second bottom plate and the third bottom plate; a liquid cooling component, the liquid cooling component includes an inlet pipe and an outlet pipe both connected to the bottom plate, one end of the inlet pipe penetrates through the box shell, and the other end communicates with the flow channel, one end of the outlet pipe penetrates through the box shell, and the other end communicates with the flow channel; an air cooling component, the air cooling component includes a first fan and a second fan respectively arranged at both ends of the air duct, the first fan and the second fan are both connected to the bottom plate, and the rotation directions of the first fan and the second fan are opposite.

[0005] Optionally, the bottom plate includes a first air duct and a second air duct both connected to the third bottom plate, a second air duct is formed inside the first air duct, one end of the second air duct communicates with the receiving cavity, and the other end communicates with the first air duct, the first fan is connected to the end of the second air duct away from the first bottom plate, a third air duct is formed inside the second air duct, one end of the third air duct communicates with the receiving cavity, the other end of the third air duct communicates with the first air duct, and the second fan is connected to the end of the third air duct away from the first bottom plate.

[0006] Optionally, the distance between one end of the first air duct away from the first air passage and the first bottom plate is H1, and the distance between one end of the second air duct away from the first air passage and the first bottom plate is H2, where H1 > H2. The first fan is used to drive the gas flow at the end of the single cell away from the first bottom plate, and the second fan is used to drive the gas flow at the end of the single cell close to the first bottom plate.

[0007] Optionally, the thickness of the second air passage is greater than that of the first air passage, and the thickness of the third air passage is greater than that of the first air passage. The first air duct and the second air duct are arranged oppositely.

[0008] Optionally, the box shell includes a plurality of first flow guiding plates arranged at intervals. The first flow guiding plates are arranged in the accommodating cavity, and are arranged along the connection direction of the first fan and the second fan and connected to the box shell.

[0009] Optionally, the air cooling component includes a plurality of second flow guiding plates arranged at intervals. The second flow guiding plates are arranged in the first air passage, and are arranged along the connection direction of the first fan and the second fan. The second flow guiding plates are connected to the bottom plate.

[0010] Optionally, the liquid cooling component includes a plurality of first baffles respectively connected to the first bottom plate and the second bottom plate; the flow channel includes a first flow channel and a second flow channel. The first flow channel is arranged among the plurality of first baffles, and the second flow channel is arranged on both sides of the plurality of first baffles. The first flow channel is communicated with the liquid inlet pipe, the second flow channel is communicated with the liquid outlet pipe, and one end of the first flow channel away from the liquid inlet pipe is communicated with one end of the second flow channel away from the liquid outlet pipe.

[0011] Optionally, the flow channel includes a liquid inlet cavity and a liquid outlet cavity that are communicated with each other. One end of the liquid inlet cavity is communicated with the liquid inlet pipe, and the other end is communicated with the liquid outlet cavity. The liquid outlet cavity is communicated with the liquid outlet pipe; the liquid cooling component includes a second baffle and a third baffle. The second baffle is arranged in the first flow channel and connected to the plurality of first baffles to form a liquid inlet cavity communicated with the liquid inlet pipe. The second baffle is provided with an outlet. The third baffle is arranged in the first flow channel, and its opposite ends are respectively connected to the side wall of the flow channel and the second baffle to separate the first flow channel.

[0012] Optionally, the liquid cooling component includes a plurality of fourth baffles. The plurality of fourth baffles are respectively arranged in the first flow channel and the second flow channel. The fourth baffles are respectively arranged at intervals with the first baffle, the second baffle, the third baffle, and the side wall of the flow channel. The fourth baffles are used to guide the flow direction of the coolant.

[0013] Optionally, the battery pack box body further includes a heat conducting plate, and the heat conducting plate is arranged on one side of the first bottom plate away from the second bottom plate.

[0014] To achieve the above object, a solution provided by the present utility model is: a battery pack, including a plurality of single cells and the battery pack box body of any one of the above, and the plurality of single cells are placed in the battery pack box body.

[0015] The beneficial effects of the present utility model are as follows: In harsh environments with high humidity and corrosive substances, such as the marine environment, the battery pack prevents moisture and corrosive substances from entering the interior through the sealing design of the casing and the bottom plate, thereby extending its service life and improving stability. To ensure the heat dissipation performance, the battery pack adopts a combined heat dissipation method of liquid cooling and air cooling. The liquid cooling component absorbs the heat generated by the single cells through the circulation of external coolant, reducing the temperature on the side close to the first bottom plate; after the coolant fits with the battery through the flow channel, it absorbs heat and rises in temperature, and then is discharged through the liquid outlet pipe. The end far from the bottom plate is cooled by the air cooling component. The second fan draws the hot gas in the box into the air duct, and the first fan discharges the cooled gas out of the cavity. The gas exchanges heat with the coolant when flowing through the second bottom plate, realizing cyclic cooling. This design does not require air inlets and outlets to be opened on the casing or the bottom plate, ensuring the safe operation of the battery pack in harsh environments. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 It is a schematic diagram of the overall structure of the battery pack provided by the embodiment of the present utility model;

[0018] Figure 2 It is a schematic diagram of a partial structure for showing the interior of the battery pack provided by the embodiment of the present utility model;

[0019] Figure 3 It is a schematic diagram of a partial structure for showing the heat conduction plate provided by the embodiment of the present utility model;

[0020] Figure 4 It is provided by the embodiment of the present utility model Figure 3 The cross-sectional structure diagram at A-A in;

[0021] Figure 5 It is provided by the embodiment of the present utility model Figure 3 The cross-sectional structure diagram at B-B in;

[0022] Figure 6 It is a schematic diagram of a partial structure for showing the interior of the casing provided by the embodiment of the present utility model;

[0023] Figure 7 It is a schematic diagram of a partial structure for showing the C-C cutting line provided by the embodiment of the present utility model;

[0024] Figure 8It is provided by an embodiment of the present utility model Figure 7 The schematic cross-sectional structure diagram at C-C in it;

[0025] Figure 9 It is a partial structure schematic diagram provided by an embodiment of the present utility model for showing the D-D cutting line;

[0026] Figure 10 It is provided by an embodiment of the present utility model Figure 9 The schematic cross-sectional structure diagram at D-D in it.

[0027] Explanation of the reference numerals in the drawings:

[0028] 20, box shell; 21, first deflector; 30, bottom plate; 31, first bottom plate; 32, second bottom plate; 33, third bottom plate; 34, first air duct; 341, second air duct; 35, second air duct; 351, third air duct; 36, first air duct; 37, flow channel; 371, first flow channel; 372, second flow channel; 373, liquid inlet cavity; 374, liquid outlet cavity; 40, accommodation cavity; 50, air cooling assembly; 51, second deflector; 52, first fan; 53, second fan; 60, liquid cooling assembly; 61, first baffle; 62, second baffle; 621, outlet; 63, third baffle; 64, fourth baffle; 65, liquid inlet pipe; 66, liquid outlet pipe; 70, heat conducting plate; 80, single cell. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present utility model.

[0030] Please refer to Figures 1 to 5 as shown Figure 1 It is the overall structure schematic diagram of the battery pack provided by an embodiment of the present utility model, Figure 2 It is a partial structure schematic diagram provided by an embodiment of the present utility model for showing the inside of the battery pack, Figure 3 It is a partial structure schematic diagram provided by an embodiment of the present utility model for showing the heat conducting plate 70, Figure 4 It is provided by an embodiment of the present utility model Figure 3 The schematic cross-sectional structure diagram at A-A in it, Figure 5 It is provided by an embodiment of the present utility model Figure 3 The schematic cross-sectional structure diagram at B-B in it.

[0031] The embodiment of the present utility model provides a battery pack, which includes a battery pack housing and a plurality of single cells 80. The battery pack housing includes a housing 20, a bottom plate 30, a liquid cooling component 60 and an air cooling component 50. An accommodation cavity 40 is formed inside the housing 20. The bottom plate 30 is connected to the housing 20 and seals the accommodation cavity 40. The plurality of single cells 80 are arranged inside the accommodation cavity 40 and fixed to the bottom plate 30 inside the accommodation cavity 40.

[0032] Specifically, the bottom plate 30 includes a first bottom plate 31, a second bottom plate 32 and a third bottom plate 33 that are connected to each other. The first bottom plate 31, the second bottom plate 32 and the third bottom plate 33 are arranged in parallel in sequence along the direction away from the accommodation cavity 40. A flow channel 37 for accommodating coolant is formed between the first bottom plate 31 and the second bottom plate 32. The projection of the flow channel 37 on the first bottom plate 31 covers the projection of the plurality of single cells 80 on the first bottom plate 31. A first air duct 36 for communicating with the accommodation cavity 40 is formed between the second bottom plate 32 and the third bottom plate 33. That is, the bottom plate 30 is a multi-layer hollow structure. A flow channel 37 and a first air duct 36 are arranged in parallel inside the bottom plate 30. The first air duct 36 is arranged on the side of the flow channel 37 away from the accommodation cavity 40. The first air duct 36 straddles the plurality of single cells 80, and both ends of the first air duct 36 on both sides of the plurality of single cells 80 are communicated with the accommodation cavity 40.

[0033] The liquid cooling component 60 includes an inlet pipe 65 and an outlet pipe 66 both connected to the bottom plate 30. One end of the inlet pipe 65 penetrates through the housing 20, and the other end is communicated with the flow channel 37. One end of the outlet pipe 66 penetrates through the housing 20, and the other end is communicated with the flow channel 37. The air cooling component 50 includes a first fan 52 and a second fan 53 respectively arranged at both ends of the air duct. The first fan 52 and the second fan 53 are both connected to the bottom plate 30, and the rotation directions of the first fan 52 and the second fan 53 are opposite. Among them, the first fan 52 is installed on the side wall of the bottom plate 30 where the first air duct 36 communicates with the accommodation cavity 40 to form the first air duct 36, and the second fan 53 is installed on the side wall of the bottom plate 30 where the other first air duct 36 communicates with the accommodation cavity 40 to form the first air duct 36.

[0034] In practical applications, when the battery pack is in a harsh environment such as at sea with high gas humidity and containing corrosive substances, the design of the housing 20 and the bottom plate 30 to seal the battery pack makes it difficult for gas to carry water vapor and corrosive substances into the interior of the battery pack, thereby improving the service life and stability of the battery pack. To ensure the heat dissipation performance of the battery pack in such a harsh environment, the battery pack adopts a heat dissipation method combining the liquid cooling component 60 and the air cooling component 50.

[0035] Among them, the specific heat dissipation method of the liquid cooling component 60 is to conduct heat exchange through the circulation of external coolant. The coolant outside the battery pack enters the flow channel 37 inside the battery pack through the liquid inlet pipe 65. The side wall of the single battery 80 close to the first bottom plate 31 is attached to the first bottom plate 31, and heat is transferred to the coolant through heat conduction. After absorbing the heat of the single battery 80, the temperature of the coolant rises, and then it is discharged outside the battery pack through the liquid outlet pipe 66, realizing the effective transfer of heat to reduce the temperature of the side of the single battery 80 close to the first bottom plate 31.

[0036] For the end of the single battery 80 far from the first bottom plate 31, the battery pack is cooled by the air cooling component 50. Since whether the first fan 52 sucks or exhausts air in the air cooling component 50 has little impact on the technical effect, here, the case where the first fan 52 exhausts air and the second fan 53 sucks air is taken as an example for illustration. The working principle of the air cooling component 50 is as follows. The second fan 53 sucks the hot gas inside the box body into the first air duct 36, and then the first fan 52 discharges the gas in the first air duct 36 out of the accommodation cavity 40. When the hot gas flows through the first air duct 36, it exchanges heat with the coolant through the second bottom plate 32. The coolant absorbs the heat of the gas, causing the temperature of the gas to drop. The gas with the reduced temperature is discharged out of the accommodation cavity 40 through the first fan 52, forming a cycle to continuously reduce the temperature of the gas in the accommodation cavity 40, and then absorb the heat of the end of the single battery 80 far from the first bottom plate 31, completing the overall heat dissipation of the single battery 80.

[0037] Thus, while the single battery 80 maintains good heat dissipation performance, there is no need to open air inlets or outlets for air cooling on the box shell 20 or the bottom plate 30, enabling the battery pack to operate safely and stably in environments with high humidity and corrosive substances, such as the marine environment.

[0038] In this embodiment, the first fan 52 can be used to suck the gas in the accommodation cavity 40 into the first air duct 36. At this time, the second fan 53 is used to discharge the gas in the first air duct 36 out of the accommodation cavity 40. The first fan 52 can also be used to discharge the gas in the first air duct 36 out of the accommodation cavity 40. At this time, the second fan 53 is used to suck the gas in the accommodation cavity 40 into the first air duct 36. One set of the first fan 52 and the second fan 53 can be provided, or multiple sets of the first fan 52 and the second fan 53 can be provided.

[0039] In one embodiment, referring to Figure 2 and Figure 3 , the battery pack box body further includes a heat conducting plate 70. The heat conducting plate 70 is arranged on the side of the first bottom plate 31 away from the second bottom plate 32. The heat conducting plate 70 is attached to the first bottom plate 31, and the projection of the heat conducting plate 70 on the first bottom plate 31 at least covers the projections of multiple single batteries 80 on the first bottom plate 31. The side walls of the multiple single batteries 80 close to the first bottom plate 31 are attached to the heat conducting plate 70.

[0040] The heat conduction plate 70 is made of a material with high thermal conductivity. These materials have a high thermal conductivity and can transfer heat quickly. In practical applications, the heat of multiple single cells 80 is quickly and effectively transferred to the coolant through the heat conduction plate 70, thereby improving the heat exchange efficiency of the liquid cooling component 60. Moreover, the projection of the heat conduction plate 70 on the first bottom plate 31 is large and the heat conduction plate 70 is in contact with the first bottom plate 31, increasing the contact area for heat exchange between the single cell 80 and the coolant and improving the heat conduction efficiency to reduce the situation of local overheating of the first bottom plate 31.

[0041] In this embodiment, the material of the heat conduction plate 70 can be aluminum alloy, or copper, stainless steel, graphite material, etc.

[0042] Further, referring to Figure 4 and Figure 5 , the bottom plate 30 includes a first air duct 34 and a second air duct 35 both connected to the third bottom plate 33. A second air duct 341 is formed inside the first air duct 34. One end of the second air duct 341 communicates with the accommodation cavity 40, and the other end communicates with the first air duct 36. The first fan 52 is connected to the end of the second air duct 341 far from the first bottom plate 31, that is, the first fan 52 is connected to the side wall of the first air duct 34 far from the first bottom plate 31 for forming the second air duct 341. A third air duct 351 is formed inside the second air duct 35. One end of the third air duct 351 communicates with the accommodation cavity 40, and the other end of the third air duct 351 communicates with the first air duct 36. The second fan 53 is connected to the end of the third air duct 351 far from the first bottom plate 31, that is, the second fan 53 is connected to the side wall of the second air duct 35 far from the first bottom plate 31 for forming the third air duct 351.

[0043] In practical applications, taking the first fan 52 exhausting air and the second fan 53 pumping air as an example for illustration, the second fan 53 first pumps the gas in the accommodation cavity 40 into the third air duct 351, and then the gas in the third air duct 351 enters the first air duct 36. Under the action of the first fan 52, the gas in the first air duct 36 is discharged from the accommodation cavity 40 through the second air duct 341. The designs of the first air duct 36 and the second air duct 341 allow the positions of the first fan 52 and the second fan 53 to be designed according to actual needs, thereby optimizing the gas flow path in the accommodation cavity 40 and ensuring a more uniform and efficient heat dissipation efficiency.

[0044] In this embodiment, the first air duct 34 and the second air duct 35 can be arranged opposite to each other or staggered. The first air duct 34 and the second air duct 35 can be arranged in a pair or multiple pairs.

[0045] Optionally, the distance between one end of the first air duct 34 away from the first air duct 36 and the first bottom plate 31 is H1, and the distance between one end of the second air duct 35 away from the first air duct 36 and the first bottom plate 31 is H2, where H1 > H2. That is, the distance between the first fan 52 and the first bottom plate 31 is greater than the distance between the second fan 53 and the first bottom plate 31. The first fan 52 is used to drive the gas flow at the end of the single battery 80 away from the first bottom plate 31, and the second fan 53 is used to drive the gas flow at the end of the single battery 80 close to the first bottom plate 31.

[0046] In practical applications, taking the first fan 52 exhausting air and the second fan 53 extracting air as an example, the cooler gas blown out by the first fan 52 passes through one end of the single battery 80 away from the first bottom plate 31 and exchanges heat with the single battery 80, and then the temperature rises. The warmer gas is drawn into the first air duct 36 by the second fan 53 and exchanges heat with the coolant, forming a cycle. The first fan 52 is arranged close to one end of the single battery 80 away from the first bottom plate 31, and the second fan 53 is arranged close to one end of the single battery 80 close to the first bottom plate 31, so that the gas in the accommodation cavity 40 can exchange heat with the whole single battery 80, thereby improving the heat dissipation effect of the air-cooling assembly 50.

[0047] Optionally, referring to Figure 5 , the thickness of the second air duct 341 is greater than the thickness of the first air duct 36, the thickness of the third air duct 351 is greater than the thickness of the first air duct 36, and the first air duct 34 and the second air duct 35 are arranged oppositely.

[0048] In practical applications, due to the limitation of the internal space of the battery pack, the thickness of the bottom plate 30 is small, so that the thickness of the first air duct 36 is small, and further the internal space of the first air duct 36 is narrow, and the gas is not easy to flow in the first air duct 36. The thicknesses of the second air duct 341 and the third air duct 351 are both greater than that of the first air duct 36, which can increase the air intake and air output of the first air duct 36, thereby increasing the flow rate of the first air duct 36, and further improving the heat exchange effect of the air-cooling assembly 50.

[0049] In one embodiment, referring to Figure 6 , the box shell 20 includes a plurality of first guide plates 21 arranged at intervals. The first guide plates 21 are arranged in the accommodation cavity 40, and the first guide plates 21 are arranged along the connection line direction of the first fan 52 and the second fan 53 and are connected to the box shell 20.

[0050] In practical applications, the first guide plates 21 can guide the gas in the accommodation cavity 40 to move along the length direction of the first guide plates 21, thereby controlling the flow direction of the gas, so that the gas can fully contact the single battery 80, and further improving the heat dissipation efficiency of the air cooling.

[0051] In one embodiment, referring to Figure 7 and Figure 8, the air-cooling assembly 50 includes a plurality of second flow-guiding plates 51 arranged at intervals. The second flow-guiding plates 51 are arranged in the first air duct 36, the second flow-guiding plates 51 are arranged along the connection direction of the first fan 52 and the second fan 53, and the second flow-guiding plates 51 are connected to the bottom plate 30.

[0052] In practical applications, the gas in the first air duct 36 can move along the length direction of the second flow-guiding plate 51, so that the moving direction of the gas is restricted, reducing the situation of the gas flowing around or stagnating in the accommodating cavity 40, improving the fluidity of the gas in the first air duct 36, and making the gas evenly distributed in the first air duct 36 to improve the heat exchange effect between the gas in the first air duct 36 and the coolant.

[0053] In one embodiment, referring to Figure 9 and Figure 10 , the liquid-cooling assembly 60 includes a plurality of first baffles 61 respectively connected to the first bottom plate 31 and the second bottom plate 32;

[0054] The flow channel 37 includes a first flow channel 371 and a second flow channel 372. The first flow channel 371 is arranged among the plurality of first baffles 61, the second flow channel 372 is arranged on both sides of the plurality of first baffles 61. The first flow channel 371 is communicated with the liquid inlet pipe 65, the second flow channel 372 is communicated with the liquid outlet pipe 66, and one end of the first flow channel 371 far from the liquid inlet pipe 65 is communicated with one end of the second flow channel 372 far from the liquid outlet pipe 66. That is, the second flow channel 372 is divided into two parts, and the two parts of the second flow channel 372 are respectively arranged on both sides of the first flow channel 371, and the first baffle 61 separates the second flow channel 372 on one side from the first flow channel 371, so that the connection part of the first flow channel 371 and the second flow channel 372 is bent. In this embodiment, the liquid outlet pipe 66 can be divided into two branch pipes, and the branch pipes are communicated with the second flow channel 372 in one-to-one correspondence.

[0055] In practical applications, the coolant first enters the first flow channel 371 through the liquid inlet pipe 65, and then the coolant in the first flow channel 371 enters the second flow channel 372 with a relatively short distance and is discharged from the second flow channel 372 through the liquid outlet pipe 66 to form a cycle, thereby guiding the moving track of the coolant. That is, the moving track of the coolant in the flow channel 37 is in an "m" shape, and the moving track of the coolant in the first flow channel 371 and the second flow channel 372 is in an "n" shape to improve the heat exchange efficiency of the liquid-cooling assembly 60.

[0056] Furthermore, referring to Figure 10 , the flow channel 37 includes a liquid inlet cavity 373 and a liquid outlet cavity 374 that are communicated with each other. One end of the liquid inlet cavity 373 is communicated with the liquid inlet pipe 65, the other end is communicated with the liquid outlet cavity 374, and the liquid outlet cavity 374 is communicated with the liquid outlet pipe 66;

[0057] The liquid cooling assembly 60 includes a second baffle 62 and a third baffle 63. The second baffle 62 is disposed in the first flow channel 371 and connected to a plurality of first baffles 61 to form an inlet liquid chamber 373 communicating with the inlet liquid pipe 65. The second baffle 62 is provided with an outlet 621. The third baffle 63 is disposed in the first flow channel 371, and its opposite ends are respectively connected to the side wall of the flow channel 37 and the second baffle 62 to partition the first flow channel 371.

[0058] In this embodiment, two outlets 621 may be provided corresponding to the first flow channel 371, and the outlets 621 correspond to the first flow channel 371 one by one.

[0059] In practical applications, the coolant in the inlet liquid chamber 373 enters the corresponding first flow channel 371 through the outlet 621, then enters the second flow channel 372 and flows out from the outlet liquid pipe 66. The inlet liquid chamber 373, the outlet liquid chamber 374, and the third baffle 63 partition the first flow channel 371 into two parts, all for guiding the flow direction of the coolant, reducing the situation of the coolant stagnating or flowing around, and ensuring that the coolant can flow through the inlet liquid chamber 373, the first flow channel 371, and the second flow channel 372 in sequence and finally flow out from the outlet liquid pipe 66, thereby improving the heat dissipation efficiency of the liquid cooling assembly 60. In this embodiment, the fourth baffle 64 may be arranged parallel to the first baffle 61.

[0060] In one embodiment, referring to Figure 10 , the liquid cooling assembly 60 includes a plurality of fourth baffles 64. The plurality of fourth baffles 64 are respectively disposed in the first flow channel 371 and the second flow channel 372. The fourth baffles 64 are respectively spaced apart from the first baffle 61, the second baffle 62, the third baffle 63, and the side wall of the flow channel 37. The fourth baffles 64 are used to guide the flow direction of the coolant. In this embodiment, the fourth baffle 64 may be arranged parallel to the first baffle 61 or may be inclined to the first baffle 61.

[0061] In practical applications, the fourth baffle 64 can guide the flow direction of the coolant, thereby optimizing the flow path of the coolant, enabling the coolant to flow to the area that needs heat dissipation, reducing the ineffective flow of the coolant in the flow channel 37, and thus improving the heat dissipation efficiency of the liquid cooling assembly 60.

[0062] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indication also changes accordingly.

[0063] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element present at the same time. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or can also be indirectly connected to the other element through an intermediate element.

[0064] In addition, in the present utility model, the descriptions involving "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0065] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the description of the specification and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A battery pack housing, characterized in that, Comprising: A box shell, in which a receiving cavity for placing single cells is formed; A bottom plate, which is connected to the box shell and seals the receiving cavity. The bottom plate includes a first bottom plate, a second bottom plate, and a third bottom plate that are connected to each other, and the first bottom plate, the second bottom plate, and the third bottom plate are arranged in sequence in a direction away from the receiving cavity; a flow channel for receiving coolant is formed between the first bottom plate and the second bottom plate, and a first air duct for communicating with the receiving cavity is formed between the second bottom plate and the third bottom plate; A liquid cooling component, which includes an inlet pipe and an outlet pipe both connected to the bottom plate. One end of the inlet pipe penetrates the box shell, and the other end communicates with the flow channel. One end of the outlet pipe penetrates the box shell, and the other end communicates with the flow channel; An air cooling component, which includes a first fan and a second fan respectively arranged at both ends of the air duct. The first fan and the second fan are both connected to the bottom plate, and the rotation directions of the first fan and the second fan are opposite.

2. The battery pack housing according to claim 1, wherein The bottom plate includes a first air duct and a second air duct both connected to the third bottom plate. A second air duct is formed inside the first air duct. One end of the second air duct communicates with the receiving cavity, and the other end communicates with the first air duct. The first fan is connected to the end of the second air duct away from the first bottom plate. A third air duct is formed inside the second air duct. One end of the third air duct communicates with the receiving cavity, and the other end of the third air duct communicates with the first air duct. The second fan is connected to the end of the third air duct away from the first bottom plate.

3. The battery pack housing according to claim 2, characterized in that, The distance between one end of the first air duct away from the first air duct and the first bottom plate is H1, and the distance between one end of the second air duct away from the first air duct and the first bottom plate is H2, where H1 > H2. The first fan is used to drive the gas flow at the end of the single cell away from the first bottom plate, and the second fan is used to drive the gas flow at the end of the single cell close to the first bottom plate.

4. The battery pack housing according to claim 2, characterized in that, The thickness of the second air duct is greater than the thickness of the first air duct, and the thickness of the third air duct is greater than the thickness of the first air duct. The first air duct and the second air duct are arranged oppositely.

5. The battery pack housing according to claim 1, characterized in that, The box shell includes a plurality of first guide plates arranged at intervals. The first guide plates are arranged in the receiving cavity, and the first guide plates are arranged along the connection line direction of the first fan and the second fan and are connected to the box shell.

6. The battery pack housing according to claim 1, wherein, The air cooling component includes a plurality of second guide plates arranged at intervals. The second guide plates are arranged in the first air duct, and the second guide plates are arranged along the connection line direction of the first fan and the second fan. The second guide plates are connected to the bottom plate.

7. The battery pack box according to claim 1, wherein The liquid cooling component includes a plurality of first baffles respectively connected to the first bottom plate and the second bottom plate; The flow channel includes a first flow channel and a second flow channel. The first flow channel is disposed among the plurality of first baffles. The second flow channel is disposed on both sides of the plurality of first baffles. The first flow channel is communicated with the liquid inlet pipe. The second flow channel is communicated with the liquid outlet pipe. One end of the first flow channel away from the liquid inlet pipe is communicated with one end of the second flow channel away from the liquid outlet pipe.

8. The battery pack box according to claim 7, wherein the flow channel includes a liquid inlet cavity and a liquid outlet cavity that are communicated with each other. One end of the liquid inlet cavity is communicated with the liquid inlet pipe, and the other end is communicated with the liquid outlet cavity. The liquid outlet cavity is communicated with the liquid outlet pipe; the liquid cooling component includes a second baffle and a third baffle. The second baffle is disposed in the first flow channel and is connected to the plurality of first baffles to form a liquid inlet cavity communicated with the liquid inlet pipe. The second baffle is provided with an outlet. The third baffle is disposed in the first flow channel, and its opposite ends are respectively connected to the side wall of the flow channel and the second baffle to partition the first flow channel.

9. The battery pack housing according to claim 7, wherein The liquid cooling component includes a plurality of fourth baffles. The plurality of fourth baffles are respectively disposed in the first flow channel and the second flow channel. The fourth baffles are respectively arranged at intervals with the first baffle, the second baffle, the third baffle, and the side wall of the flow channel. The fourth baffles are used to guide the flow direction of the coolant.

10. The battery pack housing according to claim 1, characterized in that, The battery pack box further includes a heat conducting plate, and the heat conducting plate is disposed on a side of the first bottom plate away from the second bottom plate.

11. A battery pack, characterized in that, It includes a plurality of single cells and the battery pack box according to any one of claims 1 to 10, and the plurality of single cells are placed in the battery pack box.

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