Battery box and battery pack

Abstract

The invention discloses a battery box and a battery pack. The battery box comprises a box body, a waterproof breathable film and a protective cover, a through hole is formed in the box body, and an accommodating cavity for accommodating a battery is formed in the box body; the waterproof breathable film is arranged on the side, away from the containing cavity, of the box body and covers the through hole. The protective cover is connected with the box body and presses the waterproof breathable film, a pressure relief channel communicated with the through hole is formed between the protective cover and the box body, and the pressure relief channel forms an included angle with the axis of the through hole and penetrates through the protective cover. When the battery works normally, the waterproof breathable film ensures that the accommodating cavity and the outside only exchange air, and water vapor is not allowed to enter. When the battery works abnormally, gas released by the battery breaks through the waterproof breathable film through the through hole and is discharged along the pressure relief channel. The arrangement of the pressure relief channel has the advantages that when sundries fall down by gravity and hit the protective cover, the protective cover can bear impact in the axis direction of the through hole, and the waterproof breathable film is prevented from being punctured and losing efficacy.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a battery box and a battery pack. Background Art

[0002] One of the safety protections for new energy batteries is to prevent safety crises caused by battery explosions. Batteries are usually equipped with pressure relief protection. At present, in terms of pressure relief protection, battery packs directly use explosion-proof valves, but for some battery packs that are rented and replaced, the explosion-proof valves are installed on the outer shell without protection and are easily damaged. Summary of the invention

[0003] An object of the present invention is to provide a battery box and a battery pack.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a solution as follows: the battery box includes a box body, a waterproof breathable membrane and a protective cover; the box body is provided with a through hole, and a accommodating cavity for accommodating the battery is formed inside the box body; the waterproof breathable membrane is arranged on a side of the box body away from the accommodating cavity and covers the through hole; the protective cover is connected to the box body and presses the waterproof breathable membrane, and a pressure relief channel connected to the through hole is formed between the protective cover and the box body, and the pressure relief channel forms an angle with the axis of the through hole and passes through the protective cover.

[0005] Optionally, the pressure relief channel includes a first cavity and a first notch; the protective cover includes a cover portion and a first stop portion, the cover portion is opposite to the through hole in the axial direction of the through hole, the first stop portion is arranged on the cover portion, a first cavity is formed between the cover portion, the first stop portion and the box body, the first stop portion is provided with the first notch, and the first cavity is respectively connected to the through hole and the first notch.

[0006] Optionally, the pressure relief channel includes a second cavity and a second notch; the protective cover includes a second stopper, the second stopper is arranged on the cover portion, and is spaced apart from the first stopper to form a second cavity, the second stopper is provided with a second notch, the first notch and the second stopper are opposite, and the second notch and the first stopper are opposite.

[0007] Optionally, there are multiple first notches, and the multiple first notches are evenly distributed around the axis of the through hole.

[0008] Optionally, the axial direction of the opening of the pressure relief channel penetrating the protective cover is the same as the axial direction of the through hole.

[0009] Optionally, the pressure relief passage is at least partially curved.

[0010] Optionally, one side of the box body away from the accommodating cavity is recessed to form a limiting groove, a through hole is opened in the limiting groove, the waterproof breathable membrane is arranged in the limiting groove, the first stopper is inserted into the limiting groove to press the waterproof breathable membrane, and the second stopper contacts the appearance surface of the box body.

[0011] Optionally, the first stop portion and the side wall of the limiting groove are spaced apart.

[0012] Optionally, a step is provided between the side wall and the bottom wall of the limiting groove, and the first stop portion is opposite to the side wall of the step.

[0013] Optionally, the battery box further comprises a pressure ring, which is arranged between the protective cover and the waterproof breathable membrane, and the protective cover presses the waterproof breathable membrane through the pressure ring.

[0014] Optionally, the battery box further includes screws, the box body is provided with an assembly hole, the screws pass through the assembly hole, and are connected to a side of the protective cover facing the accommodating cavity.

[0015] The present invention also includes a battery pack, which includes: a battery and a battery box as described in any one of the above items, wherein the battery is assembled in the battery box.

[0016] The beneficial effects of the present invention are as follows: the protective cover presses the waterproof breathable membrane onto the box body, the waterproof breathable membrane covers the through hole, a pressure relief channel connected to the through hole is formed between the protective cover and the box body, and the pressure relief channel forms an angle with the axis of the through hole and passes through the protective cover. When the battery is working normally, the waterproof breathable membrane ensures that only air exchanges between the accommodating cavity and the outside world, and does not allow water vapor to enter. When the battery is working abnormally, the gas released by the battery breaks through the waterproof breathable membrane through the through hole and is discharged along the pressure relief channel. The advantage of such a pressure relief channel is that when debris falls by gravity and hits the protective cover, the protective cover can withstand the impact in the axial direction of the through hole, thereby preventing the waterproof breathable membrane from being punctured and failing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 is a schematic diagram of the structure of a battery pack provided by an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the exploded structure of a battery pack provided by an embodiment of the present invention in the protective cover area;

[0020] Figure 3 is a schematic diagram of a cross-sectional structure of a battery pack provided by an embodiment of the present invention at a viewing angle in a protective cover area;

[0021] Figure 4 is a schematic structural diagram of a protective cover provided by an embodiment of the present invention;

[0022] Figure 5It is a schematic diagram of the cross-sectional structure of the battery pack provided by an embodiment of the present invention located in the protective cover area from another viewing angle.

[0023] Description of the accompanying drawings: box body 10, through hole 11, accommodating cavity 12, limiting groove 13, step 14, assembly hole 15, waterproof breathable membrane 20, protective cover 30, cover part 31, first stop part 32, partition part 33, second stop part 34, pressure relief channel 40, first cavity 41, first notch 42, second cavity 43

[0024] The second notch 44 , the pressure ring 50 , and the screw 60 . DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figures 1 to 3 As shown, Figure 1 is a schematic diagram of the structure of a battery pack provided by an embodiment of the present invention, Figure 2 is a schematic diagram of the exploded structure of the battery pack provided by an embodiment of the present invention in the area of ​​the protective cover 30, Figure 3 It is a schematic diagram of the cross-sectional structure of the battery pack provided by an embodiment of the present invention at a viewing angle in the area of ​​the protective cover 30 .

[0027] The present invention protects a battery pack, which includes: a battery and a battery box. The battery is assembled in the battery box. The battery can be a lithium iron phosphate battery, a ternary lithium battery, or a sodium ion battery. The battery box protects the battery from damage caused by external impact. When the battery releases gas abnormally, the battery box can also quickly discharge the gas to prevent the battery box from exploding due to excessive pressure.

[0028] The battery box includes a box body 10, a waterproof breathable membrane 20 and a protective cover 30. The box body 10 is provided with a through hole 11, and a receiving cavity 12 for receiving the battery is formed inside the box body 10. The receiving cavity 12 is connected to the outside through the through hole 11. The number of the through hole 11 can be one or more. The through hole 11 can be circular, square, triangular, etc.

[0029] The waterproof breathable membrane 20 is arranged on the side of the box body 10 away from the accommodating cavity 12, and covers the through hole 11. The waterproof breathable membrane 20 is a new type of polymer waterproof material. The distance between gas molecules is large, and they can pass through the air holes of the waterproof breathable membrane 20 during the diffusion movement. The distance between liquid molecules is smaller than the distance between the air holes, and under the action of surface tension, the liquid molecules cannot pass through the waterproof breathable membrane 20, that is, it plays a waterproof role. The waterproof breathable membrane 20 can ensure the circulation of air in the accommodating cavity 12 and the external air to ensure that the accommodating cavity 12 is always at the same atmospheric pressure as the outside world. The waterproof breathable membrane 20 can prevent external water vapor from entering the accommodating cavity 12, thereby causing circuit corrosion and short circuit.

[0030] The protective cover 30 is connected to the box body 10 and presses the waterproof breathable membrane 20. The protective cover 30 fixes the waterproof breathable membrane 20. A pressure relief channel 40 connected to the through hole 11 is formed between the protective cover 30 and the box body 10. The pressure relief channel 40 forms an angle with the axis of the through hole 11 and passes through the protective cover 30. The angle here can be an acute angle, a right angle, or an obtuse angle, that is, at least one section of the pressure relief channel 40 does not extend toward the axis direction of the through hole 11 to ensure that foreign objects cannot directly penetrate the pressure relief channel 40 through the gravity direction and pierce the waterproof breathable membrane 20. In the axis direction of the through hole 11, at least a part of the extension trajectory of the pressure relief channel 40 is not on the same line as the axis of the through hole 11. The pressure relief channel 40 can have a rounded transition or a sharp transition. For example, the pressure relief channel 40 can form an L-shaped shape. In this case, the pressure relief channel 40 has a sharp-angle transition. During the pressure relief process, the gas released by the battery first passes through the through hole 11 along the axial direction of the through hole 11, and then is ejected along the axial direction perpendicular to the through hole 11 under the guidance of the protective cover 30; the pressure relief channel 40 can form a spiral shape in the style of a winding mountain road. During the pressure relief process, the gas released by the battery first passes through the through hole 11 along the axial direction of the through hole 11, and then is ejected along the spiral pressure relief channel 40. In this case, the pressure relief channel 40 has a rounded transition.

[0031] In this embodiment, the protective cover 30 presses the waterproof breathable membrane 20 onto the case 10, the waterproof breathable membrane 20 covers the through hole 11, and a pressure relief channel 40 connected to the through hole 11 is formed between the protective cover 30 and the case 10. The pressure relief channel 40 is at an angle to the axis of the through hole 11 and passes through the protective cover 30. When the battery is working normally, the waterproof breathable membrane 20 ensures that only air exchanges between the accommodating cavity 12 and the outside world, and does not allow water vapor to enter. When the battery is working abnormally, the gas released by the battery breaks through the waterproof breathable membrane 20 through the through hole 11 and is discharged along the pressure relief channel 40. The advantage of setting the pressure relief channel 40 in this way is that when debris falls by gravity and hits the protective cover 30, the protective cover 30 can withstand the impact in the axial direction of the through hole 11, thereby preventing the waterproof breathable membrane 20 from being punctured and failing.

[0032] Optionally, the pressure relief channel 40 is at least partially curved, and the curvature referred to here is a smooth transition of the pressure relief channel 40, so as to facilitate the flow of gas released by the battery. The pressure relief channel 40 can be formed into a spiral shape in the style of a winding mountain road. During the pressure relief process, the gas released by the battery first passes through the through hole 11 along the axial direction of the through hole 11, and then sprays out along the spiral pressure relief channel 40. At this time, the pressure relief channel 40 has a rounded transition.

[0033] See also Figures 1 to 4 As shown, Figure 4 Schematic diagram of the structure of the protective cover 30 provided in an embodiment of the present invention.

[0034] The pressure relief channel 40 includes a first cavity 41 and a first notch 42 .

[0035] The protective cover 30 includes a cover portion 31 and a first stop portion 32. The cover portion 31 is opposite to the through hole 11 in the axial direction of the through hole 11. The first stop portion 32 is arranged on the cover portion 31. The cover portion 31 is spaced apart from the through hole 11 by the first stop portion 32. The first stop portion 32 can press the waterproof breathable membrane 20. A first cavity 41 is formed between the cover portion 31, the first stop portion 32 and the box body 10. The first notch 42 is opened in the first stop portion 32. The first cavity 41 is respectively connected to the through hole 11 and the first notch 42.

[0036] In this embodiment, after the battery abnormally releases gas, it first passes through the through hole 11 and then to the first cavity 41, and finally is discharged through the first notch 42. The cover 31 blocks the gas released by the battery from being discharged along the axial direction of the through hole 11, and also protects the waterproof breathable membrane 20 from impact from the gravity direction. In the direction perpendicular to the axial direction of the through hole 11, the first notch 42 on the first stopper 32 allows the gas released by the battery to be discharged, and the first stopper 32 can prevent foreign objects from passing into the first cavity 41 to damage the waterproof breathable membrane 20, thereby reducing the risk of the waterproof breathable membrane 20 being damaged while allowing the gas released by the battery to pass normally.

[0037] Furthermore, the pressure relief channel 40 includes a second cavity 43 and a second notch 44 .

[0038] The protective cover 30 includes a second stopper 34, which is disposed on the cover 31 and is spaced apart from the first stopper 32 to form a second cavity 43. The second stopper 34 is located on the side of the first stopper 32 away from the through hole 11. The second stopper 34 is provided with a second notch 44. The first notch 42 and the second stopper 34 are opposite, and the second notch 44 and the first stopper 32 are opposite. In the direction perpendicular to the axis of the through hole 11, the projection of the first notch 42 on the second stopper 34 does not overlap with the first notch 42, and the projection of the second notch 44 on the first stopper 32 does not overlap with the second notch 44. The first notch 42 and the second notch 44 are arranged in a staggered manner. In this way, when a foreign object is inserted into the protective cover 30 through the second notch 44, it will be blocked by the first stopper 32 from entering the first cavity 41 to prevent the foreign object from contacting the waterproof breathable membrane 20 and puncturing the waterproof breathable membrane 20. When the battery is abnormal, because the first notch 42 is connected to the second cavity 43 , 44 , the gas ejected from the battery first enters the first cavity 41 , then enters the second cavity 43 through the first notch 42 , and finally enters the second notch 44 from the second cavity 43 and is discharged.

[0039] In this embodiment, the first stopper 32 and the second stopper 34 are arranged at intervals on the cover 31, and the first notch 42 and the second notch 44 are arranged on the first stopper 32 and the second stopper 34 respectively, and the first notch 42 and the second notch 44 are staggered with each other, and the second notch 44 cannot be seen from the first notch 42, and the first notch 42 cannot be seen from the second notch 44. External hard objects passing through the second notch 44 will be blocked by the first stopper 32, and then cannot enter the first cavity 41 to damage the waterproof breathable membrane 20. The first notch 42 and the second notch 44 are connected through the second cavity 43 to ensure the normal circulation of the gas released by the battery, thereby ensuring the ventilation and water blocking function of the waterproof breathable membrane 20 when the battery is in normal use and the smooth discharge of the gas ejected when the battery is abnormal.

[0040] The number of the first notches 42 can be multiple, and the multiple first notches 42 are evenly distributed around the axis of the through hole 11. Each first notch 42 can allow the gas released by the battery to pass through. The multiple first notches 42 allow the gas released by the battery to be ejected from different directions. When the first notch 42 in one direction is blocked, the first notches 42 in the remaining directions can ensure that the gas released by the battery continues to be discharged. In addition, the gas released by the battery is evenly discharged in multiple directions, which can also ensure that the protective cover 30 is subjected to balanced pressure, avoiding the phenomenon of strain damage caused by continuous force in a single direction.

[0041] Of course, the plurality of first notches 42 may also be arranged unevenly, and the first notches 42 may be arranged according to the calculated pressure relief area based on the actual product structure.

[0042] The protective cover 30 also includes a plurality of partitions 33, which are cross-arranged in the first cavity 41 and are respectively connected to the cover 31 and the first stopper 32. The plurality of partitions 33 divide the first cavity 41 into a plurality of small cavities, which are connected to the corresponding first notches 42 to form a plurality of independent small passages. The gas released by the battery through the through hole 11 enters the small cavity and is discharged through the first notch 42. The gas released by the batteries in adjacent small cavities does not affect each other, ensuring the normal flow of each passage. In addition, the partition 33 can also strengthen the cover 31 located at the first cavity 41, improve the local strength of the cover 31, so as to withstand a greater impact force. The partition 33 can also strengthen the first stopper 32, improve the local strength of the first stopper 32, so as to withstand a greater impact force.

[0043] The number of the second notches 44 can be multiple, and the multiple second notches 44 are evenly distributed around the axis of the through hole 11. Each second notch 44 can allow the gas released by the battery to pass through, and the multiple second notches 44 allow the gas released by the battery to be ejected from different directions. When the second notch 44 in one direction is blocked, the second notches 44 in the remaining directions can ensure that the gas released by the battery continues to be discharged. In addition, the gas released by the battery is evenly discharged in multiple directions, which can also ensure that the protective cover 30 is subjected to balanced pressure, avoiding the phenomenon of strain damage caused by continuous force in a single direction.

[0044] Of course, the plurality of second notches 44 may also be arranged unevenly, and the second notches 44 may be arranged according to the calculated pressure relief area based on the actual product structure.

[0045] Look specifically Figure 2 and Figure 3 The side of the box body 10 away from the accommodating cavity 12 is recessed to form a limiting groove 13, the through hole 11 is opened in the limiting groove 13, the through hole 11 is located on the bottom wall of the limiting groove 13, the waterproof breathable membrane 20 is arranged in the limiting groove 13, and the side wall of the limiting groove 13 forms a limiting effect on the waterproof breathable membrane 20, thereby ensuring that the waterproof breathable membrane 20 covers the through hole 11. The first stopper 32 is inserted into the limiting groove 13 to press the waterproof breathable membrane 20, and the groove wall of the limiting groove 13 limits the first stopper 32 to ensure the correct assembly of the protective cover 30 and ensure that the first stopper 32 can press the waterproof breathable membrane 20, and the second stopper 34 contacts the appearance surface of the box body 10.

[0046] In this embodiment, the limiting groove 13 limits the waterproof breathable membrane 20 to ensure that the waterproof breathable membrane 20 is directly opposite to the through hole 11, and the limiting groove 13 limits the first stopper 32 to ensure that the first stopper 32 can press the waterproof breathable membrane 20. In addition, the limiting groove 13 can accommodate part of the protective cover 30 to reduce the height of the protective cover 30 protruding relative to the box body 10, thereby reducing the probability of the protective cover 30 being accidentally touched.

[0047] The first stopper 32 and the side wall of the limiting groove 13 are spaced apart, and the first stopper 32 and the side wall of the limiting groove 13 form a third cavity, and the second cavity 43 is connected to the third cavity. There is space between the first stopper 32 and the side wall of the limiting groove 13 to allow the gas released by the battery to flow, thereby increasing the flow speed of the gas released by the battery.

[0048] Furthermore, a step 14 is provided between the side wall and the bottom wall of the limiting groove 13, and the first stopper 32 is opposite to the side wall of the step 14. The free end of the first stopper 32 is deeper into the limiting groove 13 than the top surface of the step 14, and the side wall of the step 14 can prevent the first stopper 32 from contacting the side wall of the limiting groove 13, thereby ensuring the unobstructed flow of the third cavity.

[0049] The battery box also includes a pressure ring 50, which is arranged between the protective cover 30 and the waterproof breathable membrane 20. The protective cover 30 presses the waterproof breathable membrane 20 through the pressure ring 50. Specifically, the first stopper 32 presses the waterproof breathable membrane 20 through the pressure ring 50. The pressure ring 50 is an annular structure with a circular hole in the middle. The protective cover 30 applies pressure to the pressure ring 50, and the pressure ring 50 presses the waterproof breathable membrane 20. The thickness and structural strength of the pressure ring 50 are much greater than the waterproof breathable membrane 20, so the pressure ring 50 can withstand the pressure of the protective cover 30 well without being damaged. In addition, the contact area between the pressure ring 50 and the waterproof breathable membrane 20 is larger, which can better press the waterproof breathable membrane 20.

[0050] In another embodiment, the axial direction of the opening of the pressure relief channel 40 passing through the protective cover 30 is the same as the axial direction of the through hole. The pressure relief channel 40 has a first section, a middle section and a last section connected in sequence, the first section is connected to the through hole 11, the last section passes through the protective cover 30 to form an opening, the axial direction of the first section and the axial direction of the last section are the same as the axial direction of the through hole 11, and the middle section can be bent and extended in the protective cover, such as a folded line extension, a spiral extension, etc. The pressure relief channel 40 in the middle section forms an angle with the axial direction of the through hole 11.

[0051] See also Figure 5 As shown, Figure 5 3 is a schematic diagram of the cross-sectional structure of the battery pack provided by an embodiment of the present invention in the area of ​​the protective cover 30 from another perspective.

[0052] The battery box also includes a screw 60. The box body 10 is provided with an assembly hole 15. The screw 60 passes through the assembly hole 15 and is connected to the side of the protective cover 30 facing the accommodating cavity 12. The screw 60 passes through the assembly hole 15 from the side of the box body 10 located at the accommodating cavity 12 and is connected to the protective cover 30. The screw 60 does not penetrate the protective cover 30. The top surface of the protective cover 30 away from the accommodating cavity 12 is a complete surface, thereby preventing water vapor from corroding the screw 60. The screw 60 detachably connects the protective cover 30 and the box body 10. When the battery fails and the gas released by the battery breaks through the waterproof breathable membrane 20, causing the waterproof breathable membrane 20 to fail, the screw 60 can be removed, the protective cover 30 can be separated, and a new waterproof breathable membrane 20 can be replaced.

[0053] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0054] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0055] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0056] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that: The battery box also includes: A box body is provided with a through hole, and a receiving cavity for receiving a battery is formed inside the box body; A waterproof and breathable membrane, arranged on a side of the box body away from the accommodating cavity and covering the through hole; The protective cover is connected to the box body and presses the waterproof breathable membrane. The protective cover is formed with a pressure relief channel connected to the through hole. The pressure relief channel forms an angle with the axis of the through hole and passes through the protective cover.

2. The battery box according to claim 1, characterized in that: The pressure relief channel includes a first cavity and a first notch; The protective cover includes a cover portion and a first stop portion, the cover portion is opposite to the through hole in the axial direction of the through hole, the first stop portion is arranged on the cover portion, the first cavity is formed between the cover portion, the first stop portion and the box body, the first stop portion is provided with the first notch, and the first cavity is respectively connected to the through hole and the first notch.

3. The battery box according to claim 2, characterized in that: The pressure relief channel includes a second cavity and a second notch; The protective cover includes a second stopper, which is arranged on the cover and spaced apart from the first stopper to form the second cavity. The second stopper is provided with the second notch, the first notch is opposite to the second stopper, and the second notch is opposite to the first stopper.

4. The battery box according to claim 2, characterized in that: There are multiple first notches, and the multiple first notches are evenly distributed around the axis of the through hole.

5. The battery box according to claim 1, characterized in that: The axial direction of the opening of the pressure relief channel penetrating the protection cover is the same as the axial direction of the through hole.

6. The battery box according to claim 1, characterized in that: The pressure relief passage is at least partially curved.

7. The battery box according to claim 3, characterized in that: The side of the box body away from the accommodating cavity is recessed to form a limiting groove, the through hole is opened in the limiting groove, the waterproof breathable membrane is arranged in the limiting groove, the first stopper is inserted into the limiting groove to press the waterproof breathable membrane, and the second stopper is in contact with the appearance surface of the box body.

8. The battery box according to claim 7, characterized in that: The first stopper and the side wall of the limiting groove are arranged at intervals.

9. The battery box according to claim 8, characterized in that: A step is provided between the side wall and the bottom wall of the limiting groove, and the first stop portion is opposite to the side wall of the step.

10. The battery box according to any one of claims 1 to 9, characterized in that: The battery box further comprises a pressure ring, which is arranged between the protective cover and the waterproof breathable membrane, and the protective cover presses the waterproof breathable membrane through the pressure ring.

11. The battery box according to any one of claims 1 to 9, characterized in that: The battery box further comprises a screw, the box body is provided with an assembly hole, the screw passes through the assembly hole, and is connected to a side of the protective cover facing the accommodating cavity.

12. A battery pack, characterized in that: The battery pack comprises: a battery and a battery box as claimed in any one of claims 1 to 11, wherein the battery is assembled in the battery box.

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