Battery pack with air guide structure

Abstract

The battery pack with the air guide structure comprises a shell, at least two battery modules and at least two air guide shell assemblies, the shell is provided with a cavity, the shell is provided with a first air inlet and a first air outlet which are communicated with the cavity, all the battery modules are arranged in the cavity, and the air guide shell assemblies are arranged in the cavity. The air guide shell assemblies are arranged in the cavity, the air guide shell assemblies are connected to the corresponding battery modules respectively, air channels are formed in the air guide shell assemblies, the two ends of each air channel are communicated with the first air inlet and the first air outlet respectively, and the battery cells of the battery modules are located in the corresponding air channels. According to the battery pack, the air guide shell assemblies are arranged for all the battery modules, the battery cells of all the battery modules are located in the air channels on the inner sides of the corresponding air guide shell assemblies respectively, air paths of all the air channels are smooth, air cooling heat management efficiency improvement is facilitated, the heat management efficiency of the battery pack is obviously improved, and the heat management cost of the battery pack is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack with a built-in air guide structure. Background Art

[0002] With the increase of new energy storage equipment, the requirements for the safety performance, cost requirements, and cooling effect of the thermal management system of the energy storage equipment are getting higher and higher. The air-cooled battery pack usually includes a shell and multiple battery modules. The shell has a large space inside. Each battery module is arranged in the cavity inside the shell. Each battery pack is directly exposed to the cavity of the shell. The shell is provided with an air inlet and an air outlet. A fan is usually installed on the air outlet. When the fan rotates at high speed, the outside air will enter the space inside the shell through the air inlet. After contacting the battery module, it is discharged from the air outlet. In this process, the cold air will contact the battery module and take away the heat generated by the battery module. However, with this structural design, the cooling air entering the cavity does not have sufficient and effective contact with each battery module, and the air cooling effect is general. To improve the thermal management efficiency, it is usually necessary to increase the power of the fan or make complex structural improvements, which is costly. Summary of the invention

[0003] In order to solve one of the above technical problems, the present invention provides a battery pack with a built-in air guide structure.

[0004] The present invention adopts the following technical solutions:

[0005] A battery pack with a built-in air guide structure, comprising:

[0006] A housing, wherein the housing has a cavity, and the housing has a first air inlet and a first air outlet communicating with the cavity;

[0007] at least two battery modules, each of which is disposed in the cavity;

[0008] At least two air guide shell assemblies are arranged in the cavity, each air guide shell assembly is respectively connected to a corresponding battery module, and the air guide shell assembly forms an air channel, and the two ends of each air channel are respectively connected to the first air inlet and the first air outlet, and each battery cell of the battery module is located in the corresponding air channel.

[0009] Optionally, the battery cells of the battery module are arranged in sequence, and an air guide plate is provided between two adjacent battery cells;

[0010] The air guide housing assembly includes two side housings, and the two side housings are respectively arranged on both sides of the corresponding battery module along the width direction;

[0011] The wind channel includes a transition cavity between the side shell and the battery module;

[0012] Both ends of the air deflector are respectively connected to the transition cavities on both sides of the battery module;

[0013] One of the transition cavities communicates with the first air inlet, and the other transition cavity communicates with the first air outlet.

[0014] Optionally, in the direction from the first air inlet to the first air outlet, the width of the transition cavity communicating with the first air inlet gradually decreases, and the width of the transition cavity communicating with the first air outlet gradually increases.

[0015] Optionally, a heating device is provided in the transition cavity communicating with the first air inlet.

[0016] Optionally, the side shell has an outer convex shell and a flange provided around the edge of the outer convex shell;

[0017] The flanges at both ends of the side shell in the length direction are connected to the end plates of the battery module through fasteners.

[0018] Optionally, the flange at the top of the side shell extends beyond the battery cells of the battery module;

[0019] The air guide shell assembly has a top plate;

[0020] The top plate is located between the two side shells, and the top plate is connected to the flanges at the tops of the two side shells and / or the end plates at both ends of the battery module, and the top plate covers the top of the battery module.

[0021] Optionally, the battery pack with a self - contained air guide structure includes a busbar;

[0022] The busbar is arranged between the two side shells, and a plurality of aluminum bars are arranged on the busbar for connecting the battery cells of the battery module;

[0023] The busbar is located between the battery cells of the battery module and the top plate;

[0024] The air channel includes a top cavity located between the battery cells and the top plate;

[0025] The transition cavity communicates with the top cavity.

[0026] Optionally, the end plates at both ends of the battery module extend beyond the top plate;

[0027] A terminal seat is arranged on the structure where the end plate extends beyond the top plate;

[0028] The terminal seat is electrically connected to the battery cells of the battery module.

[0029] Optionally, the battery pack with a self - contained air guide structure includes an inlet air guide shell;

[0030] The housing has a first end housing, and the first air inlet is provided on the first end housing;

[0031] The air inlet and air guiding housing is located between the battery module and the first end housing;

[0032] The air inlet and air guiding housing has an air inlet and at least two air diversion outlets;

[0033] The air inlet is communicated with the first air inlet, and each air diversion outlet is respectively communicated with a corresponding air guiding housing assembly.

[0034] Optionally, the battery pack with a self - contained air guiding structure includes an exhaust air guiding housing;

[0035] The housing has a second end housing, and the first exhaust air outlet is provided on the second end housing;

[0036] The exhaust air guiding housing is located between the battery module and the second end housing;

[0037] The exhaust air guiding housing has at least two second air inlets and one second exhaust air outlet. Each second air inlet is respectively connected to a corresponding air guiding housing assembly, and the second exhaust air outlet is communicated with the first exhaust air outlet.

[0038] By adopting the above - mentioned technical solutions, the present application has the following beneficial effects:

[0039] For each battery module of the battery pack of the present application, an air guiding housing assembly is respectively provided. The battery cells of each battery module are respectively located in the air channels inside the corresponding air guiding housing assemblies. The air paths of each air channel are smooth, which is beneficial to enhancing the air - cooling and heating management, significantly improving the thermal management efficiency of the battery pack, and reducing the thermal management cost of the battery pack.

[0040] The following further describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, as part of the present application, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention, but do not constitute an improper limitation to the present invention. Obviously, the accompanying drawings in the following description are only some embodiments. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts. In the drawings:

[0042] Figure 1 Shows the external structural schematic diagram of the battery pack with a self - contained air guiding structure provided by the embodiment of the present disclosure;

[0043] Figure 2 Shows the internal structural schematic diagram of the battery pack with a self - contained air guiding structure provided by the embodiment of the present disclosure;

[0044] Figure 3 The state diagram showing a battery module with a built-in air guiding structure provided by an embodiment of the present disclosure hiding a top plate;

[0045] Figure 4 The state diagram showing a battery module with a built-in air guiding structure provided by an embodiment of the present disclosure hiding a top plate of one battery module and another battery module;

[0046] Figure 5 The cross-sectional view of a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure;

[0047] Figure 6 The perspective view of the three-dimensional structure of a partial structure of a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure;

[0048] Figure 7 The state diagram showing a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure after hiding a part of the outer shell;

[0049] Figure 8 Another cross-sectional view of a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure;

[0050] Figure 9 The exploded view of a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure;

[0051] Figure 10 The schematic structural diagram of the air guiding plate of a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure;

[0052] Figure 11 The schematic diagram of the air path inside a battery pack with a built-in air guiding structure provided by an embodiment of the present disclosure.

[0053] In the figure: 1. Outer shell; 11. First end shell; 111. First air inlet; 12. Second end shell; 121. First air exhaust port; 2. Battery module; 21. Battery cell; 22. Air guiding plate; 23. End plate; 24. Terminal block; 3. Air guiding shell assembly; 31. Side shell; 311. Outer convex shell; 312. Flange; 313. Avoidance opening; 32. Top plate; 321. Connecting ear; 33. Transition cavity; 34. Top cavity; 35. Bottom plate; 4. Heating device; 5. Air inlet guiding shell; 51. First fitting plate; 511. Air inlet; 52. Second fitting plate; 521. Shunt air outlet; 53. Shunt plate; 6. Air exhaust guiding shell; 61. First mounting plate; 62. Second mounting plate; 621. Second air exhaust port; 7. Fan; 8. Isolation cavity.

[0054] It should be noted that these drawings and text descriptions are not intended to limit the scope of the concept of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed implementation manners

[0055] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0056] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0058] See Figures 1 to 11 As shown, the embodiment of the present application provides a battery pack with a built-in air guiding structure, including: a housing 1, at least two battery modules 2 and at least two air guiding shell assemblies 3. The housing 1 has a cavity. The housing 1 has a first air inlet 111 and a first air outlet 121 communicating with the cavity. Each of the battery modules 2 is disposed in the cavity. The air guiding shell assemblies 3 are disposed in the cavity. Each of the air guiding shell assemblies 3 is respectively connected to the corresponding battery module 2. The air guiding shell assemblies 3 form air channels. Both ends of each air channel communicate with the first air inlet 111 and the first air outlet 121 respectively. Each battery cell 21 of the battery module 2 is located in the corresponding air channel.

[0059] For each battery module 2 of the battery pack of the present application, an air guiding shell assembly 3 is provided. Each battery cell 21 of each battery module 2 is located in the air channel inside the corresponding air guiding shell assembly 3. The air paths of each air channel are smooth, which is beneficial to improving the efficiency of air-cooling and heat management, significantly improving the heat management efficiency of the battery pack and reducing the heat management cost of the battery pack.

[0060] In this application, each air guide housing assembly 3 is directly connected to the corresponding battery module 2 respectively and forms an integral structure with the corresponding battery module 2, which facilitates the assembly of the battery pack. The air guide housing assembly 3 and the battery module 2 are pre-assembled. During the assembly process of the battery pack, each battery module 2 equipped with the air guide housing assembly 3 can be directly placed into the housing 1 of the battery pack, which simplifies the assembly process and improves the assembly efficiency.

[0061] In some possible implementation schemes, such as Figure 5 and Figure 11 shown, the battery cells 21 of the battery module 2 are arranged in sequence, and an air guide plate 22 is arranged between two adjacent battery cells 21. Each air guide housing assembly 3 includes two side shells 31, and the two side shells 31 are respectively arranged on both sides of the corresponding battery module 2 along the width direction. The air passage includes a transition cavity 33 located between the side shell 31 and the battery module 2. As Figure 10 shown, the air guide plate 22 has a plurality of air guide channels through which air can flow. Both ends of the air guide plate 22 are respectively connected to the transition cavities 33 on both sides of the battery module 2. One transition cavity 33 communicates with the first air inlet 111, and the other transition cavity 33 communicates with the first air outlet 121. Combining Figure 5 and Figure 11 shown, the battery pack may include a fan 7. The fan 7 is located at the first air outlet. After the fan 7 rotates at a high speed, a negative pressure can be formed in the transition cavity 33, so that the outside air can enter the transition cavity 33 formed on one side of the air guide housing assembly 3 through the first air inlet 111, and further pass through the air guide plate 22 between each battery cell 21 and then enter the transition cavity 33 formed on the other side, and finally be discharged through the first air outlet 121. Once the fan 7 starts to work, the fan 7 sucks air, and the outside air will enter each air passage. The air passage has an unobstructed air path, which is beneficial to enhancing the air cooling effect and improving the thermal management performance of the battery pack.

[0062] In some possible implementation schemes, combining Figure 5 and Figure 11 shown (it should be noted that Figure 5 and Figure 11 have the same principle but different setting structures), in the direction from the first air inlet 111 to the first air outlet 121, the transition cavity 33 communicating with the first air inlet 111 ( Figure 5 the transition cavity 33 at the lower side of the upper battery module in Figure 11The width of the transition cavity (the upper transition cavity of the upper and middle battery module) gradually decreases. The cross-section of the transition cavity 33 on one side close to the first air inlet 111 is large, and the cross-section on the side far from the first air inlet 111 is small. Due to inertia, the incoming air tends to flow towards the end side of the transition cavity 33 communicating with the first air inlet 111. In the embodiment of the present application, by gradually reducing the cross-section of the transition cavity 33, the amount of air entering the end of the transition cavity 33 is reduced. At the same time, because the space at the end of the transition cavity 33 is small, the wind speed is relatively high, which is conducive to the incoming air flowing evenly through each battery cell 21, and the amount of air flowing through each air guide plate 22 is close, so as to balance the cooling effect on each battery cell 21. In the direction from the first air inlet 111 to the first air outlet 121, the width of the transition cavity 33 ( Figure 5 the upper transition cavity 33 of the upper and middle battery module, or Figure 11 the transition cavity under the upper and middle battery module) gradually increases, that is, the transition cavity 33 communicating with the first air outlet 121 gradually increases in space in the direction from the first air inlet 111 to the first air outlet, so as to be complementary to the transition cavity 33 on the other side and is more conducive to the incoming air flowing evenly through each battery cell 21.

[0063] In some possible implementation schemes, such as Figure 5 and Figure 6 shown, a heating device 4 is arranged in the transition cavity 33 communicating with the first air inlet 111. The outside air just entering the transition cavity 33 on one side can be heated by the heating device 4, then flows through each air guide plate 22, heats each battery cell 21, and enters the transition cavity 33 on the other side after heat exchange with the battery cell 21 and finally exits from the first air outlet 121.

[0064] Among them, the heating device 4 can be a PTC heating sheet, and the PTC heating sheet can generate heat after being powered on to heat the air entering the transition cavity 33. As Figure 6 shown, the heating device 4 can be fixedly attached to the inner wall of the side shell 31. The heating device 4 can be located on one side of the middle part of the side shell 31 along the length direction close to the first air inlet 111, so as to heat the cold air entering the transition cavity 33 in a timely and effective manner. A communication port communicating with the transition cavity 33 can be arranged on the side shell 31. The heating device 4 is connected with a power supply cable, and the power supply cable penetrates through the communication port. The power supply cable can be connected to the terminal block 24 of the battery module 2. The power supply cable and the communication port are in sealed cooperation.

[0065] In some possible implementation schemes, such as Figure 2 、 Figure 3 and Figure 4As shown in the figure, the side shell 31 has a convex outer shell 311 and a flanging 312 arranged around the edge of the outer convex shell 311. The flangings 312 at both ends of the side shell 31 along the length direction can be connected to the end plate 23 of the battery module 2 through fasteners. For example, both ends of the flanging 312 on the long side of the side shell 31 can be respectively connected to the end plates 23 at both ends of the battery module through fasteners. The flanging 312 on the wide side of the side shell 31 can be fixed to the end plate 23 through fasteners. Threaded holes can be provided on the thickness end surface of the end plate 23, and the fasteners can be bolts. The screw of the bolt can pass through the flanging 312 and be threadedly connected to the threaded hole, and the cap body of the bolt is limited on the flanging 312. In the embodiment of the present application, the side shell 31 is fixed to the end plate 23 of the battery module 2 through fasteners to form an integral structure with the battery module 2, which facilitates the assembly of the battery pack.

[0066] In some possible embodiment solutions, such as Figure 6 As described above, the flanging 312 on the lower edge of the side shell 31 can be fixed to the air guide plate 22 between the respective battery cells 21 through fasteners, thereby enhancing the connection structure strength between the side shell 31 and the battery module 2 and making the air guide shell assembly 3 and the battery module 2 have better integrity.

[0067] In some possible implementation solutions, such as Figure 8 As shown in the figure, the flanging 312 on the top of the side shell 31 extends out of the battery cells 21 of the battery module 2. The air guide shell assembly 3 has a top plate 32. The top plate 32 is located between the two side shells 31, and the top plate 32 is connected to the flangings 312 on the tops (long sides of the tops) of the two side shells 31 and / or the end plates 23 at both ends of the battery module 2, and the top plate 32 covers the top of the battery module 2. The top plate 32 closes the top of the air duct to prevent air from leaking out of the top of the air duct.

[0068] Such as Figure 7 As shown in the figure, connection ears 321 can be provided on the periphery of the top plate 32. The connection ears 321 can be attached to the surface of the side shell 31 to facilitate being fixed to the side shell 31 through fasteners.

[0069] In some possible implementation solutions, the battery pack with a self-provided air guide structure includes a busbar (not shown). The busbar is arranged between the two side shells 31. A plurality of aluminum bars are provided on the busbar for connecting the respective battery cells 21 of the battery module 2. The busbar is located between the battery cells 21 of the battery module 2 and the top plate 32, such as Figure 8As shown, the air passage includes a top cavity 34 located between the battery cells 21 and the top plate 32, and the transition cavity 33 communicates with the top cavity 34. Each battery cell 21 of the battery module 2 has a terminal post, and the terminal post is connected to an aluminum bar. The terminal post and the aluminum bar are the areas with the highest temperature in the battery pack. In the embodiment of the present application, both sides of the top cavity 34 in the width direction of the battery module 2 communicate with the transition cavities 33 inside the two side cases 31 respectively. Such that part of the cooling air entering one side of the transition cavity 33 will flow through the top cavity 34 to take away the heat of the terminal post and the tab, then enter the transition cavity 33 on the other side, and finally be discharged from the first air outlet, thereby significantly reducing the heat on the terminal post side of the battery cell 21, improving safety, and improving the performance of the battery cell 21.

[0070] As Figure 4 and Figure 8 shown, the side case 31 has a convex outer case 311 and a flange 312 located on the periphery of the convex outer case. There is a gap between the convex outer case 311 and the battery cell 21, forming a transition cavity 33. The flanges 312 all converge inward towards the battery cell 21 side. The lower edge of the flange 312 at the top of the side case 31 is higher than the upper edge of each battery cell 21 of the battery module 2, so that the top of the transition cavity 33 communicates with the top cavity 34.

[0071] In some possible implementation schemes, as Figure 2 shown, the end plates 23 at both ends of the battery module 2 extend out of the top plate 32. A terminal seat 24 is provided on the structure where the end plates 23 extend out of the top plate 32. The terminal seat 24 is electrically connected to the battery cells 21 of the battery module 2. The end plates 23 at both ends of the battery module 2 are relatively high, which is convenient for installing the terminal seat 24 at the top. The terminal seat 24 is located outside the air passage, which is convenient for leading wires outwards, and the air guide shell assembly 3 will not interfere with the setting and wiring of the terminal seat 24. Among them, the aluminum bar at the end of the bus bar is electrically connected to the terminal seat 24.

[0072] In some possible implementation schemes, as Figure 6 shown, the air guide shell assembly 3 has a bottom plate 35. The bottom plate 35 is located between the two side cases 31. Each battery cell 21 of the battery module 2 is supported on the bottom plate 35. The bottom plate 35 closes the bottom of the air passage, preventing air from leaking out from the bottom of the air passage. The periphery of the bottom plate 35 is respectively connected to the two side cases 31 and the end plates 23 at both ends of the battery module 2.

[0073] In some possible implementation schemes, in combination with Figure 4 、 Figure 5 、 Figure 6 and Figure 7As shown, the battery pack with a built-in air guiding structure may further include an air inlet air guiding housing 5. The housing 1 has a first end housing 11, and a first air inlet 111 is provided on the first end housing 11. The air inlet air guiding housing 5 is located between the battery module 2 and the first end housing 11. The air inlet air guiding housing 5 has an air inlet 511 and at least two air distribution outlets 521. The air inlet 511 communicates with the first air inlet 111, and each air distribution outlet 521 communicates with a corresponding air guiding housing assembly 3 respectively.

[0074] Taking the example that two battery modules 2 are provided in the battery pack, a flow dividing plate 53 is provided in the air inlet air guiding housing 5. The flow dividing plate 53 divides the air guiding cavity inside the air inlet air guiding housing 5 to form two air paths, and the two air paths communicate with the corresponding transition cavities 33 of the two battery modules 2 respectively.

[0075] For example, the air inlet air guiding housing 5 has a first fitting plate 51 and a second fitting plate 52. The first fitting plate 51 and the second fitting plate 52 are arranged at intervals and in parallel. The air inlet 511 is provided on the first fitting plate 51, and two air distribution outlets 521 are provided on the second fitting plate 52. The first fitting plate 51 is attached to the first end housing 11, and the air inlet 511 communicates with the first air inlet 111. The second fitting plate 52 can be attached to the end plate 23 of the battery module 2 and / or the end of the side shell 31, and the second fitting plate 52 can be connected to the side shell 31 and / or the end plate 23 through fasteners. As Figure 7 shown, an avoidance opening 313 is provided on the side of the side shell 31 on one side of the battery module 2 close to the first air inlet 111. A foam can be pasted around the edge of the avoidance opening 313. The second fitting plate 52 is attached to the end of the side shell 31, and the foam is compressed and arranged between the second fitting plate 52 and the outer wall of the side shell 31. The edge of the air distribution outlet 521 on the second fitting plate 52 and the edge of the avoidance opening 313 of the side shell 31 are connected through fasteners, and the fasteners can be bolts.

[0076] As Figure 7 shown, one side of the flow dividing plate 53 extends to the air inlet 511 on the first fitting plate 51, and the air inlet 511 is divided into two sub-air inlets to guide air to the two air paths in the air inlet air guiding housing 5 respectively. The air inlet air guiding housing 5 includes side plates provided between the first fitting plate 51 and the second fitting plate 52. Some side plates are vertically connected to the first fitting plate 51 and the second fitting plate 52, and some side plates are inclined, extending obliquely from the first fitting plate 51 to the second fitting plate 52.

[0077] In some possible implementation schemes, as Figures 4 to 9As shown in the figure, the battery pack with a built-in air guiding structure may include an exhaust air guiding housing 6. The outer housing 1 has a second end housing 12, and a first exhaust air outlet 121 is provided on the second end housing 12. The exhaust air guiding housing 6 is located between the battery module 2 and the second end housing 12. The exhaust air guiding housing 6 has at least two second air inlets and a second exhaust air outlet 621. Each of the second air inlets is respectively connected to a corresponding air guiding housing assembly 3, and the second exhaust air outlet 621 communicates with the first exhaust air outlet 121.

[0078] Among them, the exhaust air guiding housing 6 may include a first mounting plate 61 and a second mounting plate 62 arranged at intervals. The first mounting plate 61 and the second mounting plate 62 are arranged at intervals and in parallel. Taking the example that two battery modules 2 are arranged in the battery pack, the first mounting plate 61 is attached to the end plate 23 and one side shell 31 of one battery module 2, and is also attached to one side shell 31 of the other battery module 2. Two second air inlets are provided on the first mounting plate 61, and the two second air inlets respectively communicate with the corresponding transition cavities 33 in the corresponding air guiding housing assemblies 3. A second exhaust air outlet 621 is provided on the second mounting plate 62. The fan 7 may be mounted on the second mounting plate 62 and cover the second exhaust air outlet 621. The fan 7 extends from the second mounting plate 62 to the first exhaust air outlet 121 provided on the second end housing 12.

[0079] When the fan 7 rotates, the outside air will enter the air inlet guiding housing 5 from the first air inlet, and enter the corresponding transition cavities on one side of the two battery modules respectively through the two shunt air outlets. Then, the cooling air flows through each air guiding plate in the battery module and enters the transition cavity on the other side of the battery module. The two paths of air finally converge into the exhaust air guiding housing 6 and are finally discharged from the battery pack through the first exhaust air outlet 121.

[0080] It should be noted that when two battery modules 2 are arranged in the battery pack, the battery cells 21 at the ends of the two battery modules 2 need to be connected by wires, and the wires can be copper bars. The copper bars can be located in the exhaust air guiding housing 6, between the first mounting plate 61 and the second mounting plate 62, and the two ends are respectively connected to the poles of the battery cells 21 at the ends of the two battery modules 2, electrically connecting the two battery modules. The air flowing through the exhaust air guiding housing 6 will take away the heat on the wires. Among them, an insulating layer can be sleeved on the wires to prevent the wires from being in electrical contact with the exhaust air guiding housing 6 and causing electric leakage.

[0081] An isolation cavity 8 is formed between the air guiding housing assemblies 3 on two adjacent battery modules 2 in the battery pack. A reinforcing plate can be arranged in the isolation cavity 8. The reinforcing plate connects the two side shells 31 on the two battery modules 2 that are close to each other, thereby enhancing the structural strength of the battery pack. The reinforcing plate can also be connected to the outer housing 1 of the battery pack through fasteners.

[0082] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present invention, may make some changes or modifications using the technical content prompted above into equivalent embodiments of equivalent changes. However, as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the present invention's solution.

Claims

1. A battery pack with a built-in air guide structure, characterized in that: include: A housing, wherein the housing has a cavity, and the housing has a first air inlet and a first air outlet communicating with the cavity; at least two battery modules, each of which is disposed in the cavity; At least two air guide shell assemblies are arranged in the cavity, each air guide shell assembly is respectively connected to a corresponding battery module, and the air guide shell assembly forms an air channel, and the two ends of each air channel are respectively connected to the first air inlet and the first air outlet, and each battery cell of the battery module is located in the corresponding air channel.

2. The battery pack with a built-in air guide structure according to claim 1, characterized in that: The cells of the battery module are arranged in sequence, and an air guide plate is provided between two adjacent cells; The air guide housing assembly includes two side housings, and the two side housings are respectively arranged on both sides of the corresponding battery module along the width direction; The wind channel includes a transition cavity between the side shell and the battery module; The two ends of the air guide plate are respectively connected to the transition cavities on both sides of the battery module; One of the transition chambers is connected to the first air inlet, and the other of the transition chambers is connected to the first air outlet.

3. The battery pack with a built-in air guide structure according to claim 2, characterized in that: In the direction from the first air inlet to the first air outlet, the width of the transition cavity connected to the first air inlet gradually decreases, and the width of the transition cavity connected to the first air outlet gradually increases.

4. The battery pack with a built-in air guide structure according to claim 2, characterized in that: A heating device is arranged in the transition cavity connected to the first air inlet.

5. The battery pack with a built-in air guide structure according to claim 2, characterized in that: The side shell has an outer convex shell and a flange arranged around the edge of the outer convex shell; The flanges at both ends of the side shell along the length direction are connected to the end plates of the battery module through fasteners.

6. The battery pack with a built-in air guide structure according to claim 5, characterized in that: The flange at the top of the side shell extends out of the battery cell of the battery module; The air guide housing assembly has a top plate; The top plate is located between the two side shells, and the top plate is connected to the flanges on the tops of the two side shells and / or the end plates at both ends of the battery module, and the top plate covers the top of the battery module.

7. The battery pack with a built-in air guide structure according to claim 6, characterized in that: Including manifolds; The busbar is disposed between the two side shells, and a plurality of aluminum bars are disposed on the busbar for connecting the battery cells of the battery module; The busbar is located between the battery cell of the battery module and the top plate; The wind channel includes a top cavity between the battery cell and the top plate; The transition chamber is connected to the top chamber.

8. The battery pack with a built-in air guide structure according to claim 6, characterized in that: End plates at both ends of the battery module extend out of the top plate; A terminal seat is arranged on the structure where the end plate extends out of the top plate; The terminal seat is electrically connected to the battery cell of the battery module.

9. The battery pack with a built-in air guide structure according to claim 1, characterized in that: Including an air inlet guide shell; The housing has a first end shell, and the first end shell is provided with the first air inlet; The air inlet guide shell is located between the battery module and the first end shell; The air inlet guide housing has an air inlet and at least two diversion air outlets; The air inlet is connected to the first air inlet, and each of the diversion air outlets is connected to a corresponding air guide shell assembly.

10. The battery pack with a built-in air guide structure according to claim 1, characterized in that: Including an exhaust air guide shell; The housing has a second end shell, and the second end shell is provided with the first air outlet; The exhaust air guide shell is located between the battery module and the second end shell; The air exhaust guide shell has at least two second air inlets and one second air exhaust port, each of the second air inlets is connected to a corresponding air guide shell assembly, and the second air exhaust port is connected to the first air exhaust port.

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