Battery box

Abstract

The application relates to the battery technical field, in particular to a battery box which comprises a box body, a battery cell assembly, a sampling circuit board and a fixing plate piece; wherein the battery cell assembly, the sampling circuit board and the fixing plate piece are arranged in the box body; the sampling circuit board is formed with a temperature detection area and is used for detecting the temperature of the battery cell assembly; the fixing plate piece and the inner wall of the box body surround a first air duct, and the first air duct is staggered with the temperature detection area, so that the air in the first air duct cannot blow on the temperature detection area. In the application, a novel battery box is provided, the first air duct and the temperature detection area on the sampling circuit board are separated by the fixing plate piece, so that the air in the air duct cannot directly blow on the temperature detection area on the sampling circuit board, the accuracy of the detection result can be guaranteed, and the power of the fan of the battery box can be adjusted according to the detection result in the later period, so that the optimal cooling effect is achieved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery box. Background Technology

[0002] Currently, to prevent the battery modules inside the battery box from overheating, air ducts are often installed inside the battery box to dissipate heat and cool the battery. However, the current heat dissipation air ducts in the battery box directly pass through the area on the flexible sampling circuit board that can detect the battery temperature. This causes the air in the air duct to dissipate heat and cool the battery temperature detection area, resulting in the actual detected temperature being much lower than the actual temperature of the battery cell. This leads to inaccurate detection results, which in turn affects the subsequent adjustment of fan power based on the detection results, thus affecting the heat dissipation of the battery cell and the performance of the battery cell. Utility Model Content

[0003] The purpose of this application is to provide a battery box that, to a certain extent, solves the technical problem in the prior art where the heat dissipation air duct inside the battery box directly passes through the area on the flexible sampling circuit board that can detect the battery temperature, thereby allowing the air in the air duct to dissipate heat and cool the battery temperature detection area. This results in a large temperature difference between the actual detected temperature and the actual temperature of the battery cell, affecting the subsequent adjustment of fan power based on the detection results, thus affecting the heat dissipation of the battery cell and the performance of the battery cell.

[0004] This application provides a battery box, including: a box body, a battery cell assembly, a sampling circuit board, and a fixing plate; wherein, the battery cell assembly, the sampling circuit board, and the fixing plate are all disposed in the box body, the sampling circuit board forms a temperature detection area and is used to detect the temperature of the battery cell assembly; the fixing plate and the inner wall of the box body form a first air duct, and the first air duct and the temperature detection area are staggered so that the air in the first air duct cannot blow onto the temperature detection area.

[0005] In the above technical solution, the battery cell assembly further includes a plurality of battery cells stacked sequentially along a first preset direction. Along a direction perpendicular to the first preset direction, at least one side of the battery cell assembly is provided with the fixing plate, the sampling circuit board and the first air duct. The fixing plate, the sampling circuit board and the first air duct all extend along the first preset direction, and the sampling circuit board is fixed to the fixing plate.

[0006] In any of the above technical solutions, the fixing plate further includes a main board body and a shielding plate body; wherein, the main board body is disposed on the side of the battery cell assembly; the shielding plate body is disposed on the side of the main board body away from the battery cell assembly and extends in a direction away from the main board body, and the shielding plate body divides the main board body into a first main board body and a second main board body along its height direction.

[0007] The first motherboard body, the shielding plate body, and the inner wall of the housing form the first air duct; the sampling circuit board is installed on the side of the second motherboard body away from the battery cell assembly, and the shielding plate body separates the sampling circuit board from the first air duct.

[0008] In any of the above technical solutions, the fixing plate further includes an auxiliary mating plate, which is connected to the main body and forms an angle between them, and the auxiliary mating plate is pressed onto the top or bottom of the battery cell assembly.

[0009] In any of the above technical solutions, the first motherboard body and the shielding plate body form an L-shaped structure. Along the first preset direction, the side of the back plate of the box body has an installation notch, and the installation notch is adapted to the L-shaped structure.

[0010] In any of the above technical solutions, the side panel of the battery box is further provided with a bend, and the bend is installed in the mounting notch and is used to block the first air duct; the bend is provided with a third air inlet.

[0011] In any of the above technical solutions, when the first air duct is disposed near the top of the battery cell assembly, a second air duct and a second air inlet are formed between the top of the battery cell assembly and the top of the housing, and the second air duct is connected to the first air duct on the side.

[0012] When the first air duct is positioned near the bottom of the battery cell assembly, a second air duct and a second air inlet are formed between the bottom of the battery cell assembly and the bottom of the housing, and the second air duct is connected to the first air duct on the side.

[0013] In any of the above technical solutions, further, the structure of the fixing plate surrounding the first air duct has a plurality of explosion-proof through holes, and the plurality of explosion-proof through holes correspond one-to-one with the explosion-proof valves of the plurality of battery cells.

[0014] In any of the above technical solutions, a first air inlet is formed on the structure of the housing corresponding to the first air duct, and the first air inlet is connected to the air duct.

[0015] In any of the above technical solutions, further, along the first preset direction, an air outlet is formed at the front end of the first air duct near the box body, and multiple sets of first air inlets are formed on the structure of the box body corresponding to the rear half of the first air duct, and each set of first air inlets is connected to the air duct, and the sum of the areas of the multiple sets of first air inlets near the rear end of the box body is greater than the sum of the areas of the multiple sets of first air inlets near the front end of the box body.

[0016] In any of the above technical solutions, the battery box further includes an electrical component mounting plate, a battery management module, a protective cover, and a fan disposed inside the box; wherein the battery management module, the protective cover, and the fan are all mounted on the electrical component mounting plate; the fan is disposed on one side of the battery management module, and the protective cover covers the battery management module to separate the fan from the wiring of the battery management module;

[0017] In any of the above technical solutions, the battery box further includes a fuse, and the fuse is mounted on the electrical component mounting plate;

[0018] The battery box also includes fire-fighting components, which are mounted on the electrical component mounting plate.

[0019] Compared with the prior art, the beneficial effects of this application are as follows:

[0020] This application provides a novel battery box that uses a fixing plate to separate the first air duct from the temperature detection area on the sampling circuit board, thereby preventing the air in the air duct from blowing directly onto the temperature detection area on the sampling circuit board. This ensures the accuracy of the detection results and helps to adjust the power of the battery box fan based on the detection results to achieve the optimal cooling effect. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the battery box provided in an embodiment of this application;

[0023] Figure 2 This is another structural schematic diagram of the battery box provided in an embodiment of this application;

[0024] Figure 3 for Figure 2 A magnified structural diagram at point A;

[0025] Figure 4 Another schematic diagram of the battery box provided in the embodiments of this application;

[0026] Figure 5 for Figure 4 A sectional view along section BB;

[0027] Figure 6 This is a schematic diagram of the battery box after the side panel is opened, as provided in an embodiment of this application.

[0028] Figure 7 This is a structural schematic diagram of the fixing plate provided in the embodiments of this application;

[0029] Figure 8 This is another structural schematic diagram of the fixing plate provided in the embodiments of this application;

[0030] Figure 9 Another structural diagram of the battery box after opening the side panel, provided in an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of the structure of the electrical mounting plate provided in an embodiment of this application.

[0032] Figure label:

[0033] 1-Box body, 101-Front panel, 1011-Air outlet grille, 102-Back panel, 1021-Mounting notch, 103-Side panel, 1031-Bending part, 1032-Third air inlet, 1033-First air inlet, 104-Second air inlet, 2-Battery cell assembly, 3-Sampling circuit board, 4-Fixing plate, 41-Main board body, 411-First main board body, 412-Second main board body, 42-Shielding plate body, 43-Auxiliary mating plate, 44-Explosion-proof through hole, 45-Bending mounting part, 5-First air duct, 6-Fastening component, 7-Second air duct, 8-Electrical component mounting plate, 9-Battery management module, 10-Protective cover, 11-Fan mounting base, 12-Fuse, 13-Fire protection component mounting base, a-First preset direction. Detailed Implementation

[0034] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0035] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0036] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The following reference Figures 1 to 10 This application describes a battery box according to some embodiments.

[0040] See Figures 1 to 9 As shown, an embodiment of this application provides a battery box, including: a box body 1, a battery cell assembly 2, a sampling circuit board 3, and a fixing plate 4; wherein, the battery cell assembly 2, the sampling circuit board 3, and the fixing plate 4 are all disposed inside the box body 1, the sampling circuit board 3 forms a temperature detection area and is used to detect the temperature of the battery cell assembly 2; the fixing plate 4 and the inner wall of the box body 1 form a first air duct 5, and the first air duct 5 is staggered from the temperature detection area so that the air in the first air duct 5 cannot blow onto the temperature detection area.

[0041] As can be seen from the structure described above, this application provides a novel battery box that uses a fixing plate 4 to separate the first air duct 5 from the temperature detection area on the sampling circuit board 3, thereby preventing the air in the first air duct 5 from blowing directly onto the temperature detection area on the sampling circuit board 3, thus ensuring the accuracy of the detection results and helping to adjust the power of the battery box fan according to the detection results in order to achieve the optimal cooling effect.

[0042] In this embodiment, preferably, as follows: Figure 5 and Figure 6 As shown, the battery cell assembly 2 includes a plurality of battery cells stacked sequentially along a first preset direction a. Along a direction perpendicular to the first preset direction a, at least one side of the battery cell assembly 2 is provided with a fixing plate 4, a sampling circuit board 3 and a first air duct 5. The fixing plate 4, the sampling circuit board 3 and the first air duct 5 all extend along the first preset direction a, and the sampling circuit board 3 is fixed to the fixing plate 4.

[0043] As described above, along the arrangement direction perpendicular to the battery cells, the ends of the battery cells, i.e., the small facet side, are provided with tabs. Therefore, the sampling circuit board 3 needs to be installed on the side of the battery cell with tabs, so that the detection area of ​​the sampling circuit board 3 can just contact the busbar connecting the battery cells (it should be noted that the busbar is fixedly installed on the fixing plate 4. After the output tabs of the battery cells are soldered, the fixing plate 4 is stably fixed on the side of the battery cells). This allows for the detection of the battery cell temperature, making the layout more reasonable and helping to improve the accuracy of the detection results. According to the above design principle, the fixing plate 4 is also installed on the side of the battery cell with tabs, and the sampling circuit board 3 is then fixed on the fixing plate 4. The fixing plate 4 serves to support the sampling circuit board 3.

[0044] It should be noted that the sampling circuit board 3 is not limited to being fixed on the fixing plate 4. A bracket or other support can also be set separately for the sampling circuit board 3. In other words, the fixing plate 4 does not support the sampling circuit board 3 at this time. Instead, the fixing plate 4 only serves to enclose the air duct and block the air duct from the sampling circuit board 3.

[0045] Furthermore, as the orientation of the battery cell's tabs changes, the orientation of the sampling circuit board 3 and the fixing plate 4 will also change accordingly.

[0046] In this embodiment, preferably, as follows: Figure 6 and Figure 7 As shown, the fixing plate 4 includes a main body 41 and a shielding plate 42; wherein, the main body 41 is disposed on the side of the cell assembly 2; the shielding plate 42 is disposed on the side of the main body 41 away from the cell assembly 2 and extends in a direction away from the main body 41, and the shielding plate 42 divides the main body 41 into a first main body 411 and a second main body 412 along its height direction.

[0047] The first main board body 411, the shielding plate body 42 and the inner wall of the housing 1 form a first air duct 5; the sampling circuit board 3 is installed on the side of the second main board body 412 away from the battery cell assembly 2, and the shielding plate body 42 separates the sampling circuit board 3 from the first air duct 5.

[0048] As can be seen from the structure described above, the first main board body 411, the shielding plate body 42 and the inner wall of the box 1 form a first air duct 5. Because the shielding plate body 42 blocks the sampling circuit board 3, the air in the air duct cannot blow onto the sampling circuit board 3, which helps to reduce the temperature difference between the temperature of the battery cell detected by the sampling circuit board 3 and the actual temperature of the battery cell, and helps to improve the accuracy of the detection results.

[0049] Furthermore, preferably, along the height direction of the motherboard body 41, the first motherboard body 411 is on top and the second motherboard body 412 is on the bottom. In this case, the shielding plate body 42 is above the sampling circuit board 3, that is, the first air duct 5 is above the sampling circuit board 3. Of course, it is not limited to this. Alternatively, along the height direction of the motherboard body 41 from top to bottom, the second motherboard body 412 can be on top and the first motherboard body 411 can be on the bottom. In this case, the sampling circuit board 3 is on top and the shielding plate body 42 is on the bottom, that is, the first air duct 5 is on the bottom. The specific choice depends on the actual needs.

[0050] Further, preferably, such as Figure 8 As shown, along the first preset direction a, a bent mounting portion 45 is formed at one end of the main body 41 near the front panel 101 of the housing 1. This bent mounting portion 45 is used to install structural components such as connectors.

[0051] Furthermore, preferably, the fixing plate 4 is made of insulating material, and preferably can be made of plastic, and can be formed by integral structure.

[0052] Furthermore, preferably, the fixing plate 4 has an installation groove for installing the busbar, and a buckle can also be provided on the side wall of the installation groove to fix the busbar.

[0053] In this embodiment, preferably, as follows: Figure 7 and Figure 10 As shown, the fixing plate 4 also includes an auxiliary mating plate 43, which is connected to the main body 41 and forms an angle between them, and the auxiliary mating plate 43 is pressed on the top or bottom of the cell assembly 2.

[0054] As can be seen from the structure described above, the auxiliary mating plate 43 is pressed on the top of the cell assembly 2, which plays a supporting role for the fixing plate 4 and improves the stability and reliability of the fixing plate 4.

[0055] Furthermore, preferably, the main body 41, the shielding plate 42, and the auxiliary mating plate 43 can be an integrated structure. Of course, it is not limited to this and can also be separate parts that are assembled together later, for example, by welding or bolts.

[0056] In this embodiment, preferably, as follows: Figure 6 and Figure 7 As shown, the first main board body 411 and the shielding plate body 42 form an L-shaped structure. Along the first preset direction a, the side of the back plate 102 of the housing 1 has an installation notch 1021, and the installation notch 1021 is adapted to the L-shaped structure.

[0057] As can be seen from the structure described above, designing the top or bottom of the side of the rear end plate as an L-shaped mounting notch 1021 allows the rear end plate to cover the fixed plate 4 with a special shape, thereby improving the sealing effect and reducing material costs.

[0058] Furthermore, preferably, an insulating plate or the like is also provided between the back plate 102 and the cell assembly 2.

[0059] In this embodiment, preferably, as follows: Figure 3 As shown, the side panel 103 of the battery box has a bent portion 1031, which is installed in the mounting notch 1021 and is used to block the first air duct 5; the bent portion 1031 has a third air inlet 1032.

[0060] As can be seen from the structure described above, a bending portion 1031, i.e. a bending plate, is provided on the side plate 103, so that it can be installed in the installation notch 1021, which can play the role of blocking the first air duct 5 over a large area, preventing debris from entering the first air duct 5. Moreover, a third air inlet 1032 is opened on the bending portion 1031 to increase the air intake area and improve the heat dissipation effect. Of course, the third air inlet 1032 may not be provided on the bending portion 1031, depending on the actual needs.

[0061] In this embodiment, preferably, as follows: Figure 5 As shown, the first air duct 5 is located near the top of the cell assembly 2, and a second air duct 7 and a second air inlet 104 are formed between the top of the cell assembly 2 and the top of the housing 1, and the second air duct 7 is connected to the first air duct 5 on the side.

[0062] As can be seen from the structure described above, an air duct, namely the second air duct 7, is also provided on the top of the battery cell assembly 2 to increase the heat dissipation area and improve the heat dissipation effect. Furthermore, the first air duct 5 and the second air duct 7 are connected so that air can be conducted between the two air ducts, thereby improving the heat dissipation effect.

[0063] Furthermore, preferably, both the first air duct 5 and the second air duct 7 extend along a first preset direction a, and the ends of the first air duct 5 and the second air duct 7 near the fan described below are open and connected to the fan described below, thereby facilitating airflow.

[0064] Furthermore, preferably, the back plate 102 is higher than the top of the cell assembly 2, so that the back plate 102 supports the top plate, thereby forming the aforementioned second air duct 7 between the top plate and the top of the cell assembly 2.

[0065] Further, preferably, such as Figure 9 As shown, the top plate of the housing 1 and its side plate 103 can be detachably connected by fastening components 6 such as bolts or screws. Similarly, the back plate 102 and the top plate can also be detachably connected by bolts or screws.

[0066] It should be noted that, not limited to the above, when the first air duct 5 is set close to the bottom of the cell assembly 2, a second air duct 7 and a second air inlet 104 are formed between the bottom of the cell assembly 2 and the bottom of the housing 1, and the second air duct 7 is connected to the first air duct 5 on the side. The specific selection is based on actual needs.

[0067] In addition, it should be noted that the first air duct 5 can also be separated from the second air duct 7, that is, the two are not connected. The specific choice depends on the actual needs.

[0068] In this embodiment, preferably, as follows: Figure 6 As shown, the structure of the fixed plate 4 surrounding the first air duct 5 has multiple explosion-proof through holes 44, and the multiple explosion-proof through holes 44 correspond one-to-one with the explosion-proof valves of multiple battery cells, which are used for exhaust and pressure relief when the battery cells are thermally runaway.

[0069] In this embodiment, preferably, as follows: Figure 1 As shown, the housing 1 has a first air inlet 1033 formed on the structure corresponding to the first air duct 5, and the first air inlet 1033 is connected to the air duct.

[0070] As can be seen from the structure described above, a first air inlet is opened on the structure corresponding to the first air duct 5 on the housing 1, so that the outside air can quickly enter the first air duct 5 and improve the heat dissipation effect.

[0071] Furthermore, preferably, along the first preset direction a, an air outlet is formed at the front end of the first air duct 5 near the housing 1, and multiple sets of first air inlets 1033 are formed on the structure of the housing 1 corresponding to the rear half of the first air duct 5, arranged in sequence at intervals, and each set of first air inlets 1033 is connected to the air duct, and the sum of the areas of the multiple sets of first air inlets 1033 near the rear end of the housing 1 is greater than the sum of the areas of the multiple sets of first air inlets 1033 near the front end of the housing 1. As can be seen, since the air outlet is at the front end of the air duct, i.e., the front end of the housing 1, multiple sets of first air inlets 1033 are opened on the rear half of the housing 1 structure. This ensures that under the action of the front-end fan, the air enters from the rear end and flows through the entire cell assembly 2 along the cell arrangement direction, increasing the heat dissipation path and helping to improve the heat dissipation effect. Moreover, the sum of the areas of the multiple sets of first air inlets 1033 near the rear end of the housing 1 is greater than the sum of the areas of the multiple sets of first air inlets 1033 near the front end of the housing 1, further increasing the air intake speed at the rear end and preventing air from being exhausted from the multiple sets of first air inlets 1033 near the front end. Of course, the design position and layout of the first air inlets 1033 are not limited to the above and can be selected according to actual needs.

[0072] In this embodiment, preferably, as follows: Figure 10 As shown, the battery box also includes an electrical component mounting plate 8, a battery management module 9, a protective cover 10, and a fan, all housed within the box body 1. The battery management module 9, the protective cover 10, and the fan are all mounted on the electrical component mounting plate 8. The fan is positioned on one side of the battery management module 9, and the protective cover 10 covers the battery management module 9 to separate the fan from the wiring of the battery management module 9. It should be noted that although the fan is not shown in the figure, a fan mounting bracket 11 is provided, indicating the fan's mounting position; the fan can be mounted on the fan mounting bracket 11.

[0073] As can be seen from the structure described above, the protective cover 10 can separate the low-voltage connection wire of the fan from the high-voltage connection wire of the battery management module 9, making it safer and more reliable.

[0074] Furthermore, preferably, along the first preset direction a, the electrical component mounting plate 8 is disposed near the front end of the housing 1, and preferably, the front panel 101 of the housing 1 is formed with an air outlet grille 1011, and the aforementioned second air inlet 104 is disposed near the back panel 102 of the housing 1, that is, cold air enters from the rear end. Under the suction action of the fan, the cold air can flow along the length direction of the battery cell assembly 2 through the entire battery cell assembly 2, improving the heat dissipation effect, and finally the hot air is discharged by the fan and the front air outlet grille 1011.

[0075] It should be noted that the extension direction and arrangement of the first air duct 5 and the second air duct 7 are not limited to those mentioned above, and can be selected according to actual needs.

[0076] In this embodiment, preferably, as follows: Figure 10 As shown, the battery box also includes a fuse 12, which is mounted on the electrical component mounting plate 8 to protect the circuit and equipment safety.

[0077] The battery box also includes a fire-fighting component, which is mounted on the electrical component mounting plate 8. This component serves to extinguish fires in the event of thermal runaway and ignition of the battery cells. It should be noted that although the fire-fighting component is not shown in the figure, the figure shows the fire-fighting component mounting base 13, indicating the mounting location of the fan's fire-fighting component. The fire-fighting component can be mounted on the fire-fighting component mounting base 13.

[0078] As can be seen from the structure described above, integrating the fuse 12 and fire protection components onto the electrical component mounting plate 8 results in higher integration, easier maintenance, and a more organized appearance.

[0079] Furthermore, preferably, the aforementioned fire-fighting component can be a fire-fighting pipe fitting, and the mounting base has an installation through hole, in which the fire-fighting pipe fitting is fixed. Of course, the structure and installation structure of the fire-fighting component are not limited to this.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such 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 battery box, characterized in that, include: The enclosure comprises a housing, a battery cell assembly, a sampling circuit board, and a fixing plate; wherein the battery cell assembly, the sampling circuit board, and the fixing plate are all disposed within the housing, the sampling circuit board forms a temperature detection area and is used to detect the temperature of the battery cell assembly; the fixing plate and the inner wall of the housing form a first air duct, and the first air duct is staggered from the temperature detection area so that the air in the first air duct cannot blow onto the temperature detection area.

2. The battery box according to claim 1, characterized in that, The battery cell assembly includes a plurality of battery cells stacked sequentially along a first preset direction. Along a direction perpendicular to the first preset direction, at least one side of the battery cell assembly is provided with the fixing plate, the sampling circuit board and the first air duct. The fixing plate, the sampling circuit board and the first air duct all extend along the first preset direction, and the sampling circuit board is fixed to the fixing plate.

3. The battery box according to claim 2, characterized in that, The fixing plate includes a main body and a shielding plate; wherein, the main body is disposed on the side of the battery cell assembly; the shielding plate is disposed on the side of the main body away from the battery cell assembly and extends in a direction away from the main body, and the shielding plate divides the main body into a first main body and a second main body along its height direction. The first motherboard body, the shielding plate body, and the inner wall of the housing form the first air duct; the sampling circuit board is installed on the side of the second motherboard body away from the battery cell assembly, and the shielding plate body separates the sampling circuit board from the first air duct.

4. The battery box according to claim 3, characterized in that, The fixing plate also includes an auxiliary mating plate, which is connected to the main body and forms an angle between them, and the auxiliary mating plate is pressed onto the top or bottom of the cell assembly.

5. The battery box according to claim 3, characterized in that, The first main board body and the shielding plate body form an L-shaped structure. Along the first preset direction, the side of the back plate of the box body has an installation notch, and the installation notch is adapted to the L-shaped structure.

6. The battery box according to claim 5, characterized in that, The side panel of the battery box has a bend, which is installed within the mounting notch and serves to block the first air duct; the bend has a third air inlet.

7. The battery box according to claim 2, characterized in that, When the first air duct is positioned close to the top of the battery cell assembly, a second air duct and a second air inlet are formed between the top of the battery cell assembly and the top of the housing, and the second air duct is connected to the first air duct on the side. When the first air duct is positioned near the bottom of the battery cell assembly, a second air duct and a second air inlet are formed between the bottom of the battery cell assembly and the bottom of the housing, and the second air duct is connected to the first air duct on the side; and / or The fixed plate has multiple explosion-proof through holes formed on the structure of the first air duct, and each of the multiple explosion-proof through holes corresponds one-to-one with the explosion-proof valve of each of the multiple battery cells.

8. The battery box according to claim 2, characterized in that, The housing has a first air inlet hole on its structure corresponding to the first air duct, and the first air inlet hole is connected to the air duct.

9. The battery box according to claim 8, characterized in that, Along the first preset direction, an air outlet is formed at the front end of the first air duct near the box body. The rear half of the box body, corresponding to the first air duct, has multiple sets of first air inlets arranged in sequence at intervals. Each set of first air inlets is connected to the air duct. The sum of the areas of the multiple sets of first air inlets near the rear end of the box body is greater than the sum of the areas of the multiple sets of first air inlets near the front end of the box body.

10. The battery box according to any one of claims 1 to 9, characterized in that, The battery box also includes an electrical component mounting plate, a battery management module, a protective cover, and a fan disposed inside the box; wherein the battery management module, the protective cover, and the fan are all mounted on the electrical component mounting plate; the fan is disposed on one side of the battery management module, and the protective cover covers the battery management module to separate the fan from the wiring of the battery management module; The battery box also includes a fuse, and the fuse is mounted on the electrical component mounting plate; The battery box also includes fire-fighting components, which are mounted on the electrical component mounting plate.

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