Battery box and battery pack with same

Abstract

The utility model particularly relates to a battery box and a battery pack with the same, and aims to solve the technical problem that a cooling system of the battery pack leaks and is easy to cause bottom scraping damage. In order to achieve the purpose, the utility model provides the battery box, which comprises a battery frame, a battery box body and a battery box body, the cooling plate is laid at the bottom of the battery frame and is in thermal contact with the battery core, and a cooling liquid connecting nozzle communicated with the cooling plate is arranged on the outer side wall of the battery frame; the protective cover is arranged at the bottom of the outer side wall and mounted on the battery frame, the protective cover covers the cooling liquid connecting nozzle from bottom to top, and a buffer gap is formed between the protective cover and the cooling liquid connecting nozzle. The protective cover covers the cooling liquid connecting nozzle, the protective cover is mounted on the battery frame, and the buffer gap is formed between the protective cover and the cooling liquid connecting nozzle, so that the bottom scraping impact force at the cooling liquid connecting nozzle area can be relieved, and the risk that the cooling liquid connecting nozzle is damaged by the bottom scraping impact force is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery box and a battery pack having the same. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] During the driving process of the vehicle, the bottom of the battery pack is very likely to be hit by stones or scraped, which may cause the water cooling plate of the battery pack to rupture and leak, the seal to fail, or even cause the battery pack to catch fire.

[0004] New regulatory requirements for bottom protection of battery packs will be released soon. However, some existing battery packs were not designed with bottom scraping in mind. Part of the liquid cooling system of the battery pack extends out of the battery pack. When the battery pack is scraped, the liquid cooling system is the first to be impacted. The liquid cooling system is generally made of materials with very weak practical strength. When the battery pack is scraped, it is very easy to break and cause coolant leakage, resulting in abnormal insulation of the battery pack and causing unsafe consequences. Utility Model Content

[0005] The purpose of this application is to at least solve the technical problem that the cooling system of the battery pack is easily damaged by scratching due to leakage, and this purpose is achieved through the following technical solutions:

[0006] In the first aspect, the present application provides a battery box, comprising: a battery frame, which is arranged around the periphery of a battery cell; a cooling plate, which is laid on the bottom of the battery frame and is in thermal contact with the battery cell, and the outer wall of the battery frame is provided with a coolant nozzle connected to the cooling plate; a protective cover, which is arranged at the bottom of the outer wall and installed to the battery frame, covering the coolant nozzle from bottom to top, and a buffer gap is provided between the protective cover and the coolant nozzle.

[0007] The present application achieves the goal of mitigating the bottom scraping impact force in the coolant nozzle area and reducing the risk of the coolant nozzle being damaged by the bottom scraping impact force by covering the coolant nozzle with a protective cover, installing the protective cover to the battery frame, and providing a buffer gap between the protective cover and the coolant nozzle.

[0008] Specifically, by covering the coolant nozzle with a protective cover, installing the protective cover to the battery frame, and setting a buffer gap between the protective cover and the coolant nozzle, the bottom-scraping impact force at the coolant nozzle area can be changed: first, the bottom-scraping impact force at the coolant nozzle is transmitted to the protective cover, and then the bottom-scraping impact force is transmitted to the battery frame with a stronger structure through the protective cover, and the battery frame bears the bottom-scraping impact force of the battery frame. Not only can the coolant nozzle be protected from the bottom-scraping impact force by the protective cover, but the bottom-scraping impact force borne by the protective cover can also be shared by the battery frame, which reduces the pressure of the protective cover and converts the load-bearing performance of the protective cover into the transmission performance. The protective cover can achieve lightweight structure, reduce the weight of the protective cover, and have a low cost for modifying the battery box. There will be no major changes to the existing structure of the battery box, which reduces the manufacturing costs such as modifying the manufacturing mold of the battery box.

[0009] In some embodiments, the outer side wall of the battery frame is provided with a reinforcing beam avoiding the coolant nozzle, and the protective cover includes an eave structure extending to the reinforcing beam, and the eave structure is installed to the reinforcing beam.

[0010] In some embodiments, the reinforcing beam is provided with an avoidance gap to avoid the coolant nozzle, and the eaves structure includes eaves plates attached to the bottom of both sides of the avoidance gap, and the eaves plates are installed to the reinforcing beams on both sides of the avoidance gap.

[0011] In some embodiments, the cooling liquid nozzle includes an inlet nozzle and an outlet nozzle that are spaced apart, and the top of the side eaves plate is provided with two partitions that extend to the avoidance gap and are spaced apart, and the two partitions have two sides facing each other to form an inlet nozzle groove and an outlet nozzle groove, respectively, and / or a plug groove for accommodating an electrical plug of the battery box is formed between the two partitions.

[0012] In some embodiments, the eave structure further includes an eave protrusion disposed on the top of the eave plate and extending to the avoidance gap, and the eave protrusion is located on the outer side of the coolant nozzle.

[0013] In some embodiments, the bottom outer edge of the edge panel is provided with an arc-shaped chamfered structure, and / or the thickness of the edge panel is configured to gradually increase from the outside to the inside.

[0014] In some embodiments, the battery frame includes a bottom plate and a frame surrounding the bottom plate, the cooling plate is laid on the bottom plate, and the cooling liquid nozzle is arranged on the outer side wall of the frame.

[0015] In some embodiments, the protective cover further comprises a bottom guard plate attached to the bottom of the frame, the top of the bottom guard plate is provided with a supporting slope cooperating with the bottom of the frame, and / or the bottom of the bottom guard plate is provided with an elastic protective layer.

[0016] In some embodiments, the protective cover further comprises a mounting plate mounted to the bottom of the base plate, two mounting wing plates are arranged on both sides of the mounting plate, and the protective cover is mounted to the base plate through the mounting plate and the two mounting wing plates.

[0017] In a second aspect, the present application further provides a battery pack, comprising a battery cell and the battery box of the first aspect, wherein the battery cell is placed inside the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 An axonometric view of a battery box according to the first embodiment of the present application;

[0020] Figure 2 for Figure 1 A schematic diagram of a partial structure of a battery box shown;

[0021] Figure 3 This is a schematic structural diagram of the protective cover of the first embodiment of the present application;

[0022] Figure 4 An axonometric view of a battery box according to a second embodiment of the present application;

[0023] Figure 5 for Figure 4 A schematic diagram of a partial structure of a battery box shown;

[0024] Figure 6 A schematic structural diagram of a protective cover according to a second embodiment of the present application;

[0025] Figure 7 An axonometric view of a battery box according to a third embodiment of the present application;

[0026] Figure 8 for Figure 7 Schematic diagram of the partial structure of the battery box shown.

[0027] The reference numerals are as follows:

[0028] 100. Battery box;

[0029] 10. Battery frame; 11. Frame; 110. Outer wall; 12. Reinforcement beam; 13. Bottom plate;

[0030] 20. Coolant nozzle; 21. Liquid inlet nozzle; 22. Liquid outlet nozzle;

[0031] 30. Protective cover; 31. Eaves plate; 311. Arc chamfer structure; 32. Partition plate; 33. Eaves protrusion; 34. Bottom guard plate; 35. Install wing plate. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", and "have" are inclusive and therefore specify the presence of stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0034] Although the terms first, second, etc. may be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms may only be used to distinguish one element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. In addition, in the description of this application, unless otherwise clearly specified and limited, the terms "set" 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 directly connected or indirectly connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] For ease of description, spatial relative terms can be used in the text to describe the relationship of an element or feature relative to another element or feature as shown in the figure, and these relative terms are, for example, "in", "inside", "top", "circumferential", "side", "bottom", etc. Such spatial relative terms are intended to include different orientations of the mechanism in use or operation in addition to the orientation depicted in the figure. For example, if the mechanism in the figure flips, the element described as "below other elements or features" or "below other elements or features" will be subsequently oriented to "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include the orientation on and below. The mechanism can be oriented in addition (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0036] The "battery frame" described in the embodiments of the present application refers to the battery box structure assembly, which is generally composed of a bottom plate, a cover plate, and a frame surrounding the bottom plate. According to the direction of the vehicle, the frame is divided into front and rear frames and side frames. The "electrical plug" described in the embodiments of the present application refers to the frame that runs through the battery frame and is used to connect the electrical components inside and outside the battery box.

[0037] When the battery pack is scraped by the bottom of the vehicle, it is easy to be damaged by the impact force of the scrape, especially the coolant nozzle exposed on the battery pack, which is the first to be damaged and can easily cause coolant leakage, resulting in insulation abnormalities in the battery pack and causing unsafe consequences.

[0038] Although some protective measures have been taken for the coolant nozzle in the prior art, these protective structures generally only play a surface protective role and do not play a role in unloading and transferring the impact force from the source, resulting in the coolant nozzle still being at risk of being damaged by the impact force of scraping the bottom.

[0039] like Figures 1 to 8 As shown, in order to solve the technical problem that the battery box of a vehicle is easily damaged by being scratched at the bottom, the embodiment of the present application proposes a battery box and a battery pack having the same, wherein the exposed coolant nozzle of the battery box is protected by a protective cover, thereby reducing the risk of the coolant nozzle being damaged by being scratched at the bottom.

[0040] Combine the following Figures 1 to 8 Specific embodiments of the battery cooling device are described in detail.

[0041] First, refer to Figures 1 to 4The present application provides a battery box 100, including a battery frame 10, a cooling plate and a protective cover 30. The battery frame 10 is arranged around the periphery of the battery cell; the cooling plate is laid on the bottom of the battery frame 10 and is in thermal contact with the battery cell, and the outer wall 110 of the battery frame 10 is provided with a coolant nozzle 20 connected to the cooling plate; the protective cover 30 is arranged at the bottom of the outer wall 110 and installed to the battery frame 10, the protective cover 30 covers the coolant nozzle 20 from bottom to top, and a buffer gap is provided between the protective cover 30 and the coolant nozzle 20.

[0042] In this embodiment, by covering the coolant nozzle 20 with the protective cover 30, installing the protective cover 30 to the battery frame 10, and setting a buffer gap between the protective cover 30 and the coolant nozzle 20, the bottom scraping impact force at the coolant nozzle 20 area can be changed: first, the bottom scraping impact force at the coolant nozzle 20 is transmitted to the protective cover 30, and then the bottom scraping impact force is transmitted to the battery frame 10 with a stronger structure through the protective cover 30, and the bottom scraping impact force of the battery frame 10 is borne by the battery frame 10. Not only can the coolant nozzle 20 be protected from the bottom scraping impact force by the protective cover 30, but the bottom scraping impact force borne by the protective cover 30 can also be shared by the battery frame 10, which reduces the pressure of the protective cover 30, and converts the load-bearing performance of the protective cover 30 into the transmission performance, so that the structure of the protective cover 30 can be lightweight, the weight of the protective cover 30 can be reduced, the cost of modifying the battery box 100 is low, and no major changes will be made to the existing structure of the battery box 100, reducing the manufacturing costs such as modifying the manufacturing mold of the battery box 100.

[0043] Furthermore, the embodiment of the present application proposes to pile up some force-transmitting materials as much as possible on the periphery of the bottom of the coolant nozzle 20 to form a protective cover 30 in the form of an outer envelope around the coolant nozzle 20. The protective cover 30 in the form of an outer envelope only reserves an assembly gap with the coolant nozzle 20 without interfering with the coolant nozzle 20, and the remaining space is piled with the protective cover 30 in the form of an outer envelope, thereby improving the utilization rate of the protective cover 30 and reducing the proportion of waste of the protective cover 30.

[0044] Specifically, when the protective cover 30 is subjected to the impact force of scraping the bottom, since a buffer gap is set between the protective cover 30 and the coolant nozzle 20, before the protective cover 30 collides with the coolant nozzle 20, the protective cover 30 will first transfer the impact force to the battery frame 10. At this time, the battery frame 10, as a load-bearing component of the bottom scraping impact force, will share the pressure of the protective cover 30 and limit the protective cover 30 from continuing to move toward the direction of the coolant nozzle 20 and collide with the coolant nozzle 20.

[0045] It should be noted that the embodiment of the present application does not limit the specific structure of the protective cover 30 because the main protection point of the embodiment of the present application lies in the force transmission path of the protective cover 30, that is, the protective cover 30 can transmit the bottom scraping impact force to the battery frame 10 without colliding with the coolant nozzle 20. Therefore, the embodiment of the present application does not limit the specific structure of the protective cover 30. Of course, the preferred structure of the protective cover 30 will also be described below.

[0046] In some embodiments, reference Figures 1 to 3 The outer wall 110 of the battery frame 10 is provided with a reinforcing beam 12 avoiding the coolant nozzle 20 , and the protective cover 30 includes an eave structure (including an eave plate 31 ) extending to the reinforcing beam 12 , and the eave structure is installed to the reinforcing beam 12 .

[0047] In this embodiment, the protective cover 30 is installed to the reinforcing beam 12 through the eaves structure. When the protective cover 30 is subjected to the bottom-scraping impact force, the protective cover 30 can transmit the bottom-scraping impact force to the reinforcing beam 12, and the reinforcing beam 12 bears a part of the bottom-scraping impact force, thereby reducing the bottom-scraping impact force transmitted from the protective cover 30 to the coolant nozzle 20.

[0048] Furthermore, the reinforcing beam 12 is located on the outer wall 110 of the battery frame 10. By transmitting the bottom scraping impact force to the reinforcing beam 12, the damage to the internal structure of the battery box 100 caused by the bottom scraping impact force can be reduced, especially the impact of the bottom scraping impact force on the battery cells inside the battery box 100 can be reduced, thereby improving the structural stability and safety reliability of the battery box 100 and the battery cells.

[0049] In some embodiments, reference Figures 1 to 3 The reinforcing beam 12 is provided with an avoidance gap to avoid the coolant nozzle 20, and the eaves structure includes eaves plates 31 attached to the bottom of both sides of the avoidance gap, and the eaves plates 31 are installed to the reinforcing beams 12 on both sides of the avoidance gap.

[0050] In this embodiment, the assembly method of the side eaves plate 31 and the reinforcing beam 12 includes screw connection, welding or clamping. The side eaves plate 31 is installed to the reinforcing beam 12 on both sides of the avoidance gap. The structural strength of the avoidance gap is supplemented by the side eaves plate 31, thereby reducing the damage of the battery box 100 at the avoidance gap.

[0051] Furthermore, by installing the edge eaves plate 31 to the reinforcing beams 12 on both sides of the avoidance gap, the reinforcing beams 12 on both sides of the avoidance gap can be evenly stressed, thereby reducing the phenomenon of uneven stress on the reinforcing beams 12 .

[0052] In some embodiments, reference Figures 4 to 6The cooling liquid nozzle 20 includes an inlet nozzle 21 and an outlet nozzle 22 that are spaced apart. The top of the side eaves plate 31 is provided with two partitions 32 that extend to the avoidance gap and are spaced apart. The two partitions 32 form an inlet nozzle groove and an outlet nozzle groove on the two sides facing each other, and / or a plug groove for accommodating the electrical plug of the battery box 100 is formed between the two partitions 32.

[0053] In this embodiment, the embodiment of the present application proposes to perform zoned protection on the liquid inlet nozzle 21 and the liquid outlet nozzle 22, so as to reduce the phenomenon that the liquid inlet nozzle 21 and the liquid outlet nozzle 22 are both subjected to impact force when the battery box 100 is subjected to the impact force of scraping the bottom. The embodiment of the present application places the liquid inlet nozzle 21 in the liquid inlet nozzle groove, and the liquid outlet nozzle 22 in the liquid outlet nozzle groove, so as to achieve the purpose of separately protecting the liquid inlet nozzle 21 and the liquid outlet nozzle 22.

[0054] In addition, a plug slot for accommodating the electric plug of the battery box 100 is formed between the two partitions 32 , which can protect the electric plug and reduce the phenomenon that the electric plug is damaged during the scraping and impact of the battery box 100 .

[0055] In some embodiments, reference Figures 4 to 6 The eave structure also includes an eave protrusion 33 arranged on the top of the eave plate 31 and extending to the avoidance gap, and the eave protrusion 33 is located on the outer side of the coolant nozzle 20.

[0056] In this embodiment, the edge protrusion 33 is located on the outer side of the coolant nozzle 20, and the edge protrusion 33 is used to make up for the structural strength of the avoidance gap, thereby reducing damage to the battery box 100 at the avoidance gap.

[0057] Specifically, the eaves protrusion 33 can be set to a solid structure or a hollow structure. As a preferred embodiment of the present application, the eaves protrusion 33 is set to a hollow grid structure, which can not only ensure the structural strength of the eaves protrusion 33, but also reduce the weight of the eaves protrusion 33, thereby realizing a lightweight design of the eaves protrusion 33.

[0058] In some embodiments, reference Figure 7 and Figure 8 The bottom outer edge of the edge eaves plate 31 is provided with an arc chamfered structure 311, and / or the thickness of the edge eaves plate 31 is set to gradually increase from the outside to the inside.

[0059] In this embodiment, an arc-shaped chamfered structure 311 is provided on the bottom outer edge of the side eaves plate 31, which can guide the bottom scraping impact force, so that the bottom scraping impact force borne by the battery box 100 can be smoothly transferred to the protective cover 30, reducing the stress concentration or uneven stress distribution of the protective cover 30.

[0060] Furthermore, the thickness of the edge eaves plate 31 is set to gradually increase from the outside to the inside, so that the load-bearing capacity of the edge eaves plate 31 gradually increases toward the battery box 100, thereby reducing the phenomenon that the cooling plate in the battery box 100 is damaged during the process of bearing the impact force of scraping the bottom.

[0061] In some embodiments, reference Figures 1 to 8 The battery frame 10 includes a bottom plate 13 and a frame 11 surrounding the bottom plate 13 , the cooling plate is laid on the bottom plate 13 , and the coolant nozzle 20 is disposed on an outer side wall 110 of the frame 11 .

[0062] In this embodiment, the outer wall 110 described in the embodiment of the present application includes the front side wall, the rear side wall or the left and right side walls of the frame 11, and the coolant nozzle 20 is arranged on the outer wall 110 of the frame 11, which is convenient for installing and connecting the coolant nozzle 20, and convenient for subsequent maintenance and replacement of the coolant nozzle 20. The cooling plate is laid on the upper surface of the bottom plate 13 and is provided with a liquid inlet connected to the coolant nozzle 20. The bottom plate 13 can protect the cooling plate.

[0063] Specifically, the frame 11 is provided with a through groove, and the coolant nozzle 20 is arranged to extend to the through groove. A positioning piece for positioning the coolant nozzle 20 is arranged in the through groove. The coolant nozzle 20 is positioned by the positioning piece, so that the operation is more convenient when the coolant nozzle 20 is connected to the cooling plate, and a blind plug effect is achieved. The structure is reasonable and the connection is firm.

[0064] This solution has a firm and tight connection and is not prone to leakage; it has a compact structure, occupies little space, does not interfere with the battery and other vehicle components, and has the effect of storage and protection.

[0065] In some embodiments, reference Figures 6 to 8 The protective cover 30 also includes a bottom guard plate 34 attached to the bottom of the frame 11, the top of the bottom guard plate 34 is provided with a supporting slope that cooperates with the bottom of the frame 11, and / or the bottom of the bottom guard plate 34 is provided with an elastic protective layer.

[0066] In this embodiment, the supporting slope is set to be consistent with the bottom contour of the frame 11, so as to improve the fit between the protective cover 30 and the bottom of the frame 11, and to compensate for the height difference between the reinforcing beam 12 and the bottom of the frame 11, thereby achieving the effective transmission of the bottom scraping impact force between the reinforcing beam 12 and the frame 11, thereby achieving the purpose of evenly distributing the bottom scraping impact force and reducing the phenomenon of damage to the battery frame 11 due to stress concentration.

[0067] Furthermore, by providing an elastic protective layer at the bottom of the bottom guard plate 34, the elastic protective layer can buffer the impact force of the bottom scraping, and reduce the risk of the bottom guard plate 34 being damaged due to the hard contact between the impact force of the bottom scraping and the bottom guard plate 34. Specifically, the material of the elastic protective layer includes PE (polyethylene), and the elastic protective layer is provided at the bottom of the bottom guard plate 34 by bonding or spraying. When the protective cover 30 is subjected to the impact force of the bottom scraping, the elastic protective layer avoids the bottom scraping obstacle by its own deformation, thereby reducing the phenomenon of the protective cover 30 being stuck to the bottom scraping obstacle.

[0068] In some embodiments, reference Figures 6 to 8 The protective cover 30 also includes a mounting plate mounted to the bottom of the base plate 13 , two mounting wing plates 35 are provided on both sides of the mounting plate, and the protective cover 30 is mounted to the base plate 13 through the mounting plate and the two mounting wing plates 35 .

[0069] In this embodiment, the mounting plate is mounted to the base plate 13, and the two mounting wings extend to the bottom beam of the base plate 13, which not only increases the effective area of ​​the protective cover 30 and the battery box 100, but also can effectively change the force transmission path between the protective cover 30 and the battery box 100. In the process of the battery pack being subjected to the bottom-scraping impact force, the protective cover 30 can transfer the bottom-scraping impact force to the mounting plate and the two mounting wings 35, and then transfer the bottom-scraping impact force to the base plate 13 and the bottom beam through the mounting plate and the two mounting wings 35, thereby sharing the bottom-scraping impact force borne by the protective cover 30 and reducing the risk of the protective cover 30 being damaged by the bottom-scraping impact.

[0070] Furthermore, the embodiments of the present application propose to share the bottom scraping impact force through the frame 11, reinforcing beam 12 and bottom plate 13 of the battery frame 10, thereby reducing the phenomenon that the bottom scraping impact force is transmitted to the cooling plate and the coolant nozzle 20, and improving the safety and reliability of the cooling plate and the coolant nozzle 20.

[0071] Second, refer to Figures 1 to 8 The present application also provides a battery pack, including a battery cell and a battery box 100 of the first aspect, wherein the battery cell is placed inside the battery box 100 .

[0072] In this embodiment, the battery pack of the second aspect has the same technical effect as the battery box 100 of the first aspect of the present application, which will not be described in detail here.

[0073] The embodiments of the present application only illustrate the structure in the battery pack related to the improvement points of the present application, and do not mean that the battery pack of the present application does not have other structures. For example, the battery pack also has a battery management system, a battery protection board, etc. Other structures will not be described one by one here.

[0074] It should be noted that the battery pack can be but is not limited to a blade battery, and is not limited to the application scenario of automobiles.

[0075] The above is only a preferred specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A battery box, characterized in that: include: A battery frame is arranged around the periphery of the battery cell; A cooling plate is laid on the bottom of the battery frame and is in thermal contact with the battery cell, and an outer side wall of the battery frame is provided with a coolant nozzle connected to the cooling plate; A protective cover is arranged at the bottom of the outer side wall and mounted to the battery frame. The protective cover covers the coolant nozzle from bottom to top and a buffer gap is arranged between the protective cover and the coolant nozzle.

2. The battery box according to claim 1, characterized in that: The outer side wall of the battery frame is provided with a reinforcing beam avoiding the coolant nozzle, and the protective cover includes an eave structure extending to the reinforcing beam, and the eave structure is installed to the reinforcing beam.

3. The battery box according to claim 2, characterized in that: The reinforcing beam is provided with an avoidance gap to avoid the coolant nozzle, and the side eave structure includes side eave plates attached to the bottom of both sides of the avoidance gap, and the side eave plates are installed to the reinforcing beams on both sides of the avoidance gap.

4. The battery box according to claim 3, characterized in that: The cooling liquid connection nozzle comprises an inlet nozzle and an outlet nozzle which are spaced apart from each other. The top of the edge eaves plate is provided with two partitions which extend to the avoidance gap and are spaced apart from each other. The two partitions respectively form an inlet nozzle groove and an outlet nozzle groove on their backs to each other, and / or a plug groove for accommodating the electrical plug of the battery box is formed between the two partitions.

5. The battery box according to claim 3, characterized in that: The edge eave structure also includes an edge eave protrusion which is arranged on the top of the edge eave plate and extends to the avoidance gap, and the edge eave protrusion is located on the outer side of the coolant nozzle.

6. The battery box according to claim 3, characterized in that: The bottom outer edge of the edge panel is provided with an arc chamfer structure, and / or the thickness of the edge panel is arranged to gradually increase from the outside to the inside.

7. The battery box according to any one of claims 1 to 6, characterized in that: The battery frame includes a bottom plate and a frame surrounding the bottom plate, the cooling plate is laid on the bottom plate, and the cooling liquid nozzle is arranged on the outer side wall of the frame.

8. The battery box according to claim 7, characterized in that: The protective cover also includes a bottom guard plate attached to the bottom of the frame, the top of the bottom guard plate is provided with a supporting slope that matches the bottom of the frame, and / or the bottom of the bottom guard plate is provided with an elastic protective layer.

9. The battery box according to claim 7, characterized in that: The protective cover also includes a mounting plate mounted to the bottom of the base plate, two mounting wing plates are arranged on both sides of the mounting plate, and the protective cover is mounted to the base plate through the mounting plate and the two mounting wing plates.

10. A battery pack, characterized in that: The invention comprises a battery cell and a battery box according to any one of claims 1 to 9, wherein the battery cell is placed inside the battery box.

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