Battery box and battery pack

Abstract

The utility model provides a battery box and a battery pack, the battery box comprises a bottom plate and a frame, the bottom plate and the frame define a mounting cavity, the bottom plate is internally provided with a plurality of liquid cooling runners for liquid cooling media to circulate, at least one end of the bottom plate is provided with a groove, and the groove is located in the mounting cavity; the water distribution box is arranged on the bottom plate and located in the mounting cavity, at least one part of the water distribution box is arranged in the groove, and a liquid passing hole is formed in the portion, located in the groove, of the water distribution box and communicates with the liquid cooling flow channel. According to the battery box and the battery pack provided by the utility model, the problem that the hidden danger of liquid leakage exists due to the fact that the water distribution box is easy to damage in the structural arrangement of the water distribution box and the liquid cooling plate in the prior art can be solved.

Description

Technical Field

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

[0002] In order to improve the energy density of the battery pack, some existing battery packs have introduced a technical solution that integrates liquid cooling channels in the box. Liquid cooling of the box reduces the need for additional heat dissipation components, and the saved space can be used to place more battery cells, thereby improving the battery energy density.

[0003] There are two main designs of water dividing box and liquid cooling plate for common battery packs on the market. One is that the water dividing box and liquid cooling plate of the battery pack are integrated into one design. The manufacturing cost of this method is relatively high, and another design method is usually adopted. The other is that the water dividing box and the liquid cooling plate of the battery pack are split into a separate design. Specifically, the water dividing box is directly set on the top of the liquid cooling plate, and the water dividing box and the liquid cooling plate are fixedly connected by arc welding. The split structure of the water dividing box and the liquid cooling plate is easy to process and form, and the cost is relatively low. However, in actual use, the battery pack with a split design of the water dividing box and the liquid cooling plate will inevitably be bumped and damaged during assembly and transportation, which will bring hidden dangers of leakage.

[0004] As can be seen from the above, in the structural arrangement of the water separation box and the liquid cooling plate in the prior art, the water separation box is easily damaged, resulting in the hidden danger of liquid leakage. Utility Model Content

[0005] The main purpose of the utility model is to provide a battery box and a battery pack to solve the problem that the water separation box is easily damaged in the structural arrangement of the water separation box and the liquid cooling plate in the prior art, resulting in the hidden danger of liquid leakage.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery box is provided, including a bottom plate and a frame, the bottom plate and the frame are arranged to form an installation cavity, the bottom plate is provided with a plurality of liquid cooling channels for circulating liquid cooling medium, at least one end of the bottom plate along a first direction is provided with a groove, and the groove is located inside the installation cavity; a water dividing box, the water dividing box is arranged on the bottom plate and located inside the installation cavity, at least a part of the water dividing box is arranged inside the groove, and the water dividing box located inside the groove has a liquid hole, and the liquid hole is connected to the liquid cooling channel.

[0007] Furthermore, the water distribution box includes: a mounting plate, which is arranged inside the groove; a flow channel structure, which is arranged on the side of the mounting plate away from the bottom plate, the flow channel structure has a flow channel cavity, the liquid hole is arranged on the mounting plate and connected to the flow channel cavity, and the flow channel cavity is connected to the liquid cooling flow channel through the liquid hole.

[0008] Furthermore, the outer peripheral surface of the mounting plate is in contact with the inner wall surface of the groove; and / or the surface of the mounting plate at the notch of the groove is flush with the surface of the bottom plate.

[0009] Furthermore, a water outlet groove is arranged inside the groove, a through hole connected to the water outlet groove is provided on the bottom plate, a water outlet boss is provided on the mounting plate, at least a part of the water outlet boss extends into the interior of the water outlet groove, a liquid hole is provided on the water outlet boss, and the liquid hole is connected to the through hole.

[0010] Furthermore, the water distribution box also includes a water nozzle, which is arranged on the flow channel structure and is connected to the flow channel cavity. The flow channel structure includes a liquid inlet channel and a liquid outlet channel arranged on the same mounting plate. The water nozzle includes a water inlet nozzle and a water outlet nozzle. The water inlet nozzle is arranged on the liquid inlet channel, and the water outlet nozzle is arranged on the liquid outlet channel.

[0011] Furthermore, the frame has a hole structure, one end of the water inlet and the water outlet is connected to the flow channel cavity, and the other ends of the water inlet and the water outlet extend to the outside of the installation cavity through the hole structure; and / or, along the first direction, the water inlet is arranged at one end of the liquid inlet flow channel, and the water outlet is arranged at an end of the liquid outlet flow channel away from the water inlet.

[0012] Furthermore, the liquid inlet channel and the liquid outlet channel extend in the same direction; and / or along a second direction perpendicular to the first direction, the liquid inlet channel and the liquid outlet channel are spaced apart from each other in the first direction; and / or along a third direction, the projections of the liquid inlet channel and the liquid outlet channel on the mounting plate are located inside the mounting plate, and the third direction is the height direction of the battery box.

[0013] Furthermore, the water inlet trough includes a water inlet trough and a water outlet trough, and along a first direction, the water inlet trough and the water outlet trough are alternately arranged; along a second direction perpendicular to the first direction, the water inlet trough and the water outlet trough are alternately arranged.

[0014] Furthermore, the frame and the bottom plate are connected by arc welding; and / or the water diversion box and the bottom plate are connected by friction stir welding.

[0015] According to another aspect of the present invention, a battery pack is provided, comprising the above-mentioned battery box.

[0016] By applying the technical solution of the utility model, the following technical effects are achieved:

[0017] 1. The split structure of the bottom plate and the water-dividing box can facilitate the processing and forming of the bottom plate and the water-dividing box, reduce the difficulty of forming, and reduce the cost. By placing at least a part of the water-dividing box in the groove, the stability of the water-dividing box installation can be increased. When the water-dividing box collides with external components during the installation, transportation or maintenance of the entire battery box, the inner wall of the groove can play a limiting role, preventing the water-dividing box from moving relative to the bottom plate, thereby improving the water-dividing box's ability to resist collision.

[0018] 2. Since the outer circumference of the mounting plate fits the inner wall of the groove, when the water diversion box collides, no matter what direction the force is applied, the inner wall of the groove in the corresponding direction can bear the force. When the mounting plate wants to move due to the collision, the inner wall of the groove limits the displacement of the mounting plate in all directions, blocking the displacement of the mounting plate. This further increases the anti-collision ability of the water diversion box.

[0019] 3. The flow channel cavity in the flow channel structure is connected with the liquid cooling flow channel through the liquid hole, so that the liquid cooling medium is connected with the liquid cooling flow channel through the flow channel cavity in the liquid cooling flow channel, which is convenient for the cooling medium to enter and exit the liquid cooling flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 A schematic diagram of the overall structure of the battery box provided for this application;

[0022] Figure 2 A top view of the base plate provided for this application;

[0023] Figure 3 To reflect the overall structural diagram of the water diversion box provided by this application;

[0024] Figure 4 Another angle diagram of the water diversion box provided by the present application;

[0025] Figure 5 It is a schematic diagram showing the coordination between the liquid hole and the water outlet groove.

[0026] The above drawings include the following reference numerals:

[0027] 1. Bottom plate; 11. Groove; 12. Water inlet groove; 121. Water inlet groove; 122. Water outlet groove; 2. Frame; 21. Hole structure; 3. Water distribution box; 31. Mounting plate; 311. Liquid hole; 312. Water inlet boss; 32. Flow channel structure; 321. Liquid inlet flow channel; 322. Liquid outlet flow channel; 33. Water nozzle; 331. Water inlet nozzle; 332. Water outlet nozzle. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0030] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0031] Embodiment 1

[0032] In order to solve the problem that the water separation box in the structural setting of the water separation box and the liquid cooling plate in the prior art is easily damaged, resulting in the hidden danger of leakage, the present application provides a battery box, which increases the anti-collision ability of the water separation box of the battery box by adding a limiter.

[0033] A battery box, see Figures 1 to 5 The battery box includes a bottom plate 1, a frame 2 and a water dividing box 3. The bottom plate 1 and the frame 2 are arranged to form an installation cavity. The bottom plate 1 has a plurality of liquid cooling channels for providing a liquid cooling medium to flow. A groove 11 is provided at at least one end of the bottom plate 1 along a first direction. The groove 11 is located inside the installation cavity. The water dividing box 3 is arranged on the bottom plate 1 and inside the installation cavity. At least a part of the water dividing box 3 is arranged inside the groove 11. The water dividing box 3 located inside the groove 11 has a liquid hole 311, and the liquid hole 311 is connected to the liquid cooling channel.

[0034] Among them, Figure 1 As shown, the X direction shown is the first direction, the Y direction shown is the second direction, and the Z direction shown is the third direction, that is, the height direction of the battery box.

[0035] During use, the battery cell is placed in the battery box, and the battery cell is cooled by the liquid cooling channel located in the bottom plate 1. The liquid cooling medium enters and exits the liquid cooling channel through the water distribution box 3 connected to the liquid cooling channel. Usually, the liquid cooling medium is water, which has high specific heat capacity and low price. In order to improve safety, a non-conductive coolant can also be selected.

[0036] Specifically, the bottom plate 1 and the water-dividing box 3 are split structures, which can facilitate the processing and forming of the bottom plate 1 and the water-dividing box 3, reduce the difficulty of forming, and reduce the cost. By placing at least a portion of the water-dividing box 3 in the groove 11, the stability of the installation of the water-dividing box 3 can be increased. When the water-dividing box 3 collides with external components during the installation, transportation or maintenance of the entire battery box, the inner wall of the groove 11 can play a limiting role, preventing the water-dividing box 3 from being displaced relative to the bottom plate 1, thereby improving the anti-collision ability of the water-dividing box 3.

[0037] Furthermore, the water distribution box 3 includes a mounting plate 31 and a flow channel structure 32. The mounting plate 31 is arranged inside the groove 11, and the flow channel structure 32 is arranged on the side of the mounting plate 31 away from the base plate 1. The flow channel structure 32 has a flow channel cavity. The liquid hole 311 is arranged on the mounting plate 31 and connected to the flow channel cavity. The flow channel cavity is connected to the liquid cooling channel through the liquid hole 311.

[0038] Specifically, the mounting plate 31 is installed inside the groove 11. When the mounting plate 31 or the flow channel structure 32 installed on the mounting plate 31 collides, the inner wall of the groove 11 limits the mounting plate 31, blocks the displacement of the mounting plate 31, and increases the stability of the installation of the mounting plate 31. The flow channel cavity located in the flow channel structure 32 is connected to the liquid cooling flow channel through the liquid hole 311, so that the liquid cooling medium is connected to the liquid cooling flow channel through the flow channel cavity located in the liquid cooling flow channel, which facilitates the cooling medium to enter and exit the liquid cooling flow channel.

[0039] Since the mounting plate 31 is a flat structure, after the mounting plate 31 is set inside the groove 11, friction stir welding can be used to achieve the connection between the mounting plate 31 and the base plate 1. This structural design method provides the possibility of friction stir welding for the connection between the water diversion box 3 and the base plate 1. At the same time, it is easier to implement in terms of process than arc welding, and further improves the anti-collision ability.

[0040] Furthermore, the outer peripheral surface of the mounting plate 31 is in contact with the inner wall surface of the groove 11 .

[0041] Since the outer peripheral surface of the mounting plate 31 is in contact with the inner wall surface of the groove 11, when the water diversion box 3 collides, no matter what direction the force is applied, the inner wall of the groove 11 in the corresponding direction can bear the force, and when the mounting plate 31 wants to move due to the collision, the inner wall of the groove 11 limits the displacement of the mounting plate 31 in all directions, thereby blocking the displacement of the mounting plate 31, thereby further increasing the anti-collision capability of the water diversion box 3.

[0042] Furthermore, the surface of the mounting plate 31 located at the notch of the groove 11 is flush with the surface of the base plate 1 .

[0043] In this way, after the installation is completed, the mounting plate 31 can be completely located in the groove 11 and will not protrude from the bottom plate 1, which can reduce the collision between the mounting plate 31 and other components, avoid the possibility of collision caused by the mounting plate 31, and further increase the anti-collision ability of the water diversion box 3.

[0044] In this embodiment, a water outlet groove 12 is provided inside the groove 11, and the base plate 1 also has a through hole connected to the water outlet groove 12. A water outlet boss 312 is provided on the mounting plate 31, and at least a portion of the water outlet boss 312 extends into the interior of the water outlet groove 12. The water outlet boss 312 has a liquid hole 311, and the liquid hole 311 is connected to the through hole.

[0045] During the installation process, the water inlet groove 12 cooperates with the water inlet boss 312 and a part of the water inlet boss 312 extends into the interior of the water groove. Through the cooperation between the water inlet groove 12 and the water inlet boss 312, the sealing effect between the water diversion box 3 and the base plate 1 can be increased. Through the two-level cooperation structure of the mounting plate 31 and the groove 11, and the water inlet groove 12 and the water inlet boss 312, the sealing of the connection between the two is increased, and the leakage of the cooling medium is reduced.

[0046] In this embodiment, the water distribution box 3 further includes a water nozzle 33 . The water nozzle 33 is disposed on the flow channel structure 32 , and the water nozzle 33 is communicated with the flow channel cavity.

[0047] The water nozzle 33 is used to connect the flow channel structure 32 with external pipelines. The external pipelines are installed on the water nozzle 33, and then connected with the flow channel cavity and the liquid cooling flow channel through the water nozzle 33, so that the liquid cooling medium can enter and exit the liquid cooling flow channel. The connection between the water nozzle 33 and the external pipeline can facilitate the installation between the water distribution box 3 and the external pipeline.

[0048] Furthermore, the flow channel structure 32 includes a liquid inlet channel 321 and a liquid outlet channel 322 arranged on the same mounting plate 31, and the water nozzle 33 includes a water inlet nozzle 331 and a water outlet nozzle 332, the water inlet nozzle 331 is arranged on the liquid inlet channel 321, and the water outlet nozzle 332 is arranged on the liquid outlet channel 322.

[0049] The flow channel structure 32 is divided into a liquid inlet flow channel 321 and a liquid outlet flow channel 322, so that a water separation box 3 can be responsible for the liquid inlet and liquid outlet of the liquid cooling medium at the same time, thereby making the structure of the water separation box 3 more compact, reducing the volume of the installation cavity occupied by the water separation box 3, and improving the space utilization rate of the installation cavity.

[0050] Furthermore, the inlet channel 321 and the outlet channel 322 extend in the same direction, which is convenient for processing and also convenient for the flow efficiency of the liquid cooling medium. Preferably, the extension direction of the inlet channel 321 and the outlet channel 322 is consistent with the first direction.

[0051] The liquid inlet channel 321 and the liquid outlet channel 322 extend in the same direction. In a possible embodiment, the liquid inlet channel 321 and the liquid outlet channel 322 are spaced apart along the first direction. At this time, the liquid inlet channel 321 is connected to one end of the liquid cooling channel in the base plate 1, and the liquid outlet channel 322 is connected to the other end of the liquid cooling channel in the base plate 1. The liquid cooling channel is roughly U-shaped in the base plate.

[0052] In another possible implementation, Figure 3As shown, along the second direction perpendicular to the first direction, the liquid inlet channel 321 and the liquid outlet channel 322 are spaced apart. The present embodiment adopts the spaced apart liquid inlet channel 321 and the liquid outlet channel 322 to realize the independence of liquid inlet and liquid outlet. In order to further avoid the cross-flow between the liquid inlet channel 321 and the liquid outlet channel 322, the mounting plate area between the liquid inlet channel 321 and the liquid outlet channel 322 can be further puncture-stir-welded with the bottom plate 1 to improve the reliability of the water diversion box 3.

[0053] It can be understood that when the liquid inlet channel 321 and the liquid outlet channel 322 are installed on two mounting plates 31 , the two mounting plates 31 can be located at two ends of the bottom plate 1 .

[0054] In this embodiment, the frame 2 has a hole structure 21 , one end of the water inlet nozzle 331 and the water outlet nozzle 332 are connected to the flow channel cavity, and the other end of the water inlet nozzle 331 and the water outlet nozzle 332 extend to the outside of the installation cavity through the hole structure 21 .

[0055] The water-dividing box 3 is installed inside the installation cavity. Due to the protective effect of the frame 2, the water-dividing box 3 can be prevented from colliding with the outside world, further improving the anti-collision capability of the water-dividing box 3. At the same time, the via structure 21 can limit the water inlet nozzle 331 and the water outlet nozzle 332, reducing the displacement of the water inlet nozzle 331 and the water outlet nozzle 332, further improving the anti-collision capability of the water-dividing box 3.

[0056] Further, along the first direction, the water inlet nozzle 331 is disposed at one end of the liquid inlet channel 321 , and the water outlet nozzle 332 is disposed at one end of the liquid outlet channel 322 away from the water inlet nozzle 331 .

[0057] The water inlet nozzle 331 and the water outlet nozzle 332 are respectively arranged at the two ends of the water separation box 3, which can avoid the inconvenience of connection caused by the water inlet nozzle 331 and the water outlet nozzle 332 being installed too close. At the same time, since the water inlet nozzle 331 and the water outlet nozzle 332 are arranged at the two ends of the water separation box 3, the utilization of the space in the middle part of the installation cavity can be reduced, and the space at the edge of the installation cavity can be used to improve the utilization rate of the space.

[0058] Furthermore, if Figure 3 As shown, along the third direction, the projections of the liquid inlet flow channel 321 and the liquid outlet flow channel 322 on the mounting plate 31 are located inside the mounting plate 31. That is, along the first direction and / or along the second direction, the liquid inlet flow channel 321 and the liquid outlet flow channel 322 are both arranged inside the mounting plate 31, so as to reserve an area at the edge of the mounting plate 31 for friction stir welding with the bottom plate.

[0059] Furthermore, the water inlet groove 12 includes an inlet groove 121 and an outlet groove 122. Along a first direction, the inlet groove 121 and the outlet groove 122 are alternately arranged; along a second direction perpendicular to the first direction, the inlet groove 121 and the outlet groove 122 are alternately arranged.

[0060] The staggered and spaced arrangement of the water inlet groove 121 and the water outlet groove 122 can separate the water inlet groove 121 and the water outlet groove 122, so as to facilitate the cooperation with the water inlet boss 312. After the liquid cooling cycle is formed in the liquid cooling channel, it is convenient to distinguish the liquid inlet and the liquid outlet.

[0061] In this embodiment, the liquid cooling medium enters the interior of the liquid inlet channel 321 through the water inlet nozzle 331, and then flows through the water inlet groove 121, the liquid hole 311, and the through hole in sequence to enter the interior of the liquid cooling channel for cooling and heat dissipation; after the heat dissipation inside the liquid cooling channel is completed, the liquid cooling medium flows through the through hole, the liquid hole 311, the water outlet groove 122, the liquid outlet channel 322, the water outlet nozzle 332 in sequence and is discharged.

[0062] In this embodiment, the frame 2 and the bottom plate 1 are connected by arc welding; the water diversion box 3 and the bottom plate 1 are connected by friction stir welding.

[0063] The frame 2 and the bottom plate 1 are connected by arc welding, which is simple to operate and convenient for connecting the frame 2 and the bottom plate 1. The water distribution box 3 and the bottom plate 1 are connected by friction stir welding, which is easier to implement than arc welding in terms of technology and improves the anti-collision ability.

[0064] Embodiment 2

[0065] This embodiment provides a battery pack, including the battery box in the first embodiment.

[0066] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0067] 1. The split structure of the base plate 1 and the water diversion box 3 can facilitate the processing and forming of the base plate 1 and the water diversion box 3, reduce the difficulty of forming, and reduce the cost. However, there is a hidden danger of loose connection during installation. By placing at least a part of the water diversion box 3 in the groove 11, the stability of the installation of the water diversion box 3 can be increased. When the water diversion box 3 collides with external components during the installation, transportation or maintenance of the entire battery box, the inner wall of the groove 11 can play a limiting role, preventing the water diversion box 3 from displacing relative to the base plate 1, thereby improving the anti-collision ability of the water diversion box 3.

[0068] 2. Since the outer peripheral surface of the mounting plate 31 is in contact with the inner wall of the groove 11, when the water diversion box 3 collides, no matter what direction the force is applied, the inner wall of the groove 11 in the corresponding direction can bear the force. When the mounting plate 31 wants to move due to the collision, the inner wall of the groove 11 limits the displacement of the mounting plate 31 in all directions, thereby blocking the displacement of the mounting plate 31. This further increases the anti-collision capability of the water diversion box 3.

[0069] 3. The mounting plate 31 is installed inside the groove 11. When the mounting plate 31 or the flow channel structure 32 installed on the mounting plate 31 collides, the inner wall of the groove 11 limits the mounting plate 31, blocks the displacement of the mounting plate 31, and increases the stability of the installation of the mounting plate 31. The flow channel cavity in the flow channel structure 32 is connected to the liquid cooling flow channel through the liquid hole 311, so that the liquid cooling medium is connected to the liquid cooling flow channel through the flow channel cavity in the liquid cooling flow channel, which facilitates the cooling medium to enter and exit the liquid cooling flow channel.

[0070] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0071] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0072] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0073] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery box, characterized in that: include: A bottom plate (1) and a frame (2), wherein the bottom plate (1) and the frame (2) are arranged to form a mounting cavity, wherein the bottom plate (1) has a plurality of liquid cooling channels for circulating a liquid cooling medium, and a groove (11) is arranged at at least one end of the bottom plate (1) along a first direction, wherein the groove (11) is located inside the mounting cavity; A water diversion box (3), the water diversion box (3) is arranged on the base plate (1) and is located inside the installation cavity, at least a portion of the water diversion box (3) is arranged inside the groove (11), and the water diversion box (3) located inside the groove (11) has a liquid passage hole (311), and the liquid passage hole (311) is connected to the liquid cooling channel.

2. The battery box according to claim 1, characterized in that: The water separation box (3) comprises: A mounting plate (31), wherein the mounting plate (31) is arranged inside the groove (11); A flow channel structure (32), wherein the flow channel structure (32) is arranged on a side of the mounting plate (31) away from the base plate (1), the flow channel structure (32) has a flow channel cavity, the liquid passage hole (311) is arranged on the mounting plate (31) and is connected to the flow channel cavity, and the flow channel cavity is connected to the liquid cooling flow channel through the liquid passage hole (311).

3. The battery box according to claim 2, characterized in that: The outer peripheral surface of the mounting plate (31) is in contact with the inner wall surface of the groove (11); and / or The surface of the mounting plate (31) located at the notch of the groove (11) is flush with the surface of the bottom plate (1).

4. The battery box according to claim 2, characterized in that: A nozzle groove (12) is arranged inside the groove (11); a through hole connected to the nozzle groove (12) is provided on the bottom plate (1); a nozzle boss (312) is provided on the mounting plate (31); at least a portion of the nozzle boss (312) extends into the interior of the nozzle groove (12); the nozzle boss (312) has the liquid passage hole (311); and the liquid passage hole (311) is connected to the through hole.

5. The battery box according to claim 4, characterized in that: The water separation box (3) further comprises a water nozzle (33); the flow channel structure (32) comprises a liquid inlet flow channel (321) and a liquid outlet flow channel (322) arranged on the same mounting plate (31); the water nozzle (33) comprises a water inlet nozzle (331) and a water outlet nozzle (332); the water inlet nozzle (331) is arranged on the liquid inlet flow channel (321); and the water outlet nozzle (332) is arranged on the liquid outlet flow channel (322).

6. The battery box according to claim 5, characterized in that: The frame (2) has a hole structure (21), one end of the water inlet nozzle (331) and the water outlet nozzle (332) are in communication with the flow channel cavity, and the other end of the water inlet nozzle (331) and the water outlet nozzle (332) extend to the outside of the installation cavity through the hole structure (21); and / or Along the first direction, the water inlet nozzle (331) is arranged at one end of the liquid inlet channel (321), and the water outlet nozzle (332) is arranged at one end of the liquid outlet channel (322) away from the water inlet nozzle (331).

7. The battery box according to claim 5, characterized in that: The liquid inlet channel (321) and the liquid outlet channel (322) extend in the same direction; and / or Along a second direction perpendicular to the first direction, the liquid inlet channel (321) and the liquid outlet channel (322) are arranged at intervals; and / or Along a third direction, the projections of the liquid inlet channel (321) and the liquid outlet channel (322) on the mounting plate (31) are located inside the mounting plate (31), and the third direction is the height direction of the battery box.

8. The battery box according to claim 6, characterized in that: The water inlet trough (12) comprises a water inlet trough (121) and a water outlet trough (122). Along the first direction, the water inlet grooves (121) and the water outlet grooves (122) are arranged alternately; Along a second direction perpendicular to the first direction, the water inlet groove (121) and the water outlet groove (122) are arranged at intervals.

9. The battery box according to claim 1, characterized in that: The frame (2) and the bottom plate (1) are connected by arc welding; and\or The water separation box (3) and the bottom plate (1) are welded by friction stirring.

10. A battery pack, characterized in that: A battery box comprising the battery box described in any one of claims 1 to 9.

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