Battery box and battery pack

Abstract

The utility model 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 comprises a cover part, a first blocking part and a limiting part, the cover part is opposite to the through hole, the first blocking part is arranged on the cover part, a first cavity is formed among the cover part, the first blocking part and the box body, the first cavity is communicated with the through hole and the outside, the first blocking part presses the waterproof breathable film, and the limiting part is arranged in the first cavity and connected with the cover part. The limiting parts and the waterproof breathable films are arranged at intervals. The first blocking part forms first limit on the waterproof breathable film, the limiting part forms second limit on the waterproof breathable film, and the first blocking part and the second blocking part can ensure that the waterproof breathable film is within a preset flatness range, so that the waterproof breathable film is prevented from wrinkling, and the waterproof breathable effect is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery pack, in particular to a battery box and a battery pack. BACKGROUND

[0002] One of the safety protection of new energy battery is to prevent safety crisis caused by battery explosion, and the battery is usually provided with pressure relief protection. At present, in the aspect of pressure relief protection, the battery pack directly uses the explosion-proof valve, and some explosion-proof valves use waterproof and breathable membranes, but the waterproof and breathable effect of the waterproof and breathable membrane is not good. SUMMARY

[0003] One of the purposes of the present application is to provide a battery box and a battery pack to solve the problem of poor waterproof and breathable effect of the waterproof and breathable membrane.

[0004] To achieve the above purpose, one of the schemes provided by the present application is: the battery box comprises a box body, a waterproof and breathable membrane and a protective cover; the box body is provided with a through hole, and an accommodation cavity for accommodating a battery is formed in the inside of the box body; the waterproof and breathable membrane is arranged on the side of the box body away from the accommodation cavity and covers the through hole; the protective cover comprises a cover part, a first blocking part and a limiting part, the cover part is opposite to the through hole, the first blocking part is arranged on the cover part, a first cavity is formed between the cover part, the first blocking part and the box body, the first cavity is respectively communicated with the through hole and the outside, the first blocking part presses the waterproof and breathable membrane, the limiting part is arranged in the first cavity and connected with the cover part, and the limiting part and the waterproof and breathable membrane are arranged in a spaced manner.

[0005] Optionally, the distance between the top surface of the limiting part and the cover part is L1, the distance between the top surface of the first blocking part and the cover part is L2 millimeters, and 5≤L2-L1≤15.

[0006] Optionally, the battery box further comprises a pressing ring, the pressing ring is arranged between the first blocking part and the waterproof and breathable membrane, and the first blocking part presses the waterproof and breathable membrane through the pressing ring.

[0007] Optionally, the number of the limiting parts is multiple, and the multiple limiting parts are arranged in the first cavity in a crossed manner and connected with the first blocking part.

[0008] Optionally, the first blocking part is provided with a first notch, and the first cavity is respectively communicated with the through hole and the first notch.

[0009] Optionally, the protective cover comprises a second blocking part, the second blocking part is arranged on the cover part and arranged in a spaced manner to form a second cavity, the second blocking part is provided with a second notch, the first notch is opposite to the second blocking part, and the second notch is opposite to the first blocking part.

[0010] Optionally, the side of the box body away from the accommodation cavity is recessed to form a limiting groove, the through hole is arranged in the limiting groove, the waterproof and breathable membrane is arranged in the limiting groove, the first blocking part is arranged in the limiting groove, and the second blocking part is in contact with 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 arranged 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 screw, the box body is provided with an assembly hole, the screw is arranged through the assembly hole and connected to the side of the protective cover facing the containing cavity.

[0014] The application further comprises a battery pack, which comprises a battery and the battery box according to any one of the above.

[0015] The application has the beneficial effect that 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 protective cover presses the waterproof and breathable film on the box body through the first stop portion, the waterproof and breathable film covers the through hole, the limiting portion is arranged in the first cavity and connected to the cover portion, the limiting portion and the waterproof and breathable film are spaced apart, the protective cover limits the waterproof and breathable film through the limiting portion, and the part of the waterproof and breathable film that is buckled is straightened and flattened to a range of a preset flatness, so that wrinkles of the waterproof and breathable film in the installation process are avoided, and the waterproof and breathable effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the application, and for those skilled in the art, other drawings can also be obtained according to the structures shown in the drawings without creative labor.

[0017] Figure 1 is a structural schematic diagram of a battery pack provided by the embodiment of the application;

[0018] Figure 2 is an exploded structural schematic diagram of the battery pack in the region of the protective cover provided by the embodiment of the application;

[0019] Figure 3 is a cross-sectional structural schematic diagram of the battery pack in the region of the protective cover from a perspective provided by the embodiment of the application;

[0020] Figure 4 is a structural schematic diagram of the protective cover provided by the embodiment of the application;

[0021] Figure 5 is a cross-sectional structural schematic diagram of the battery pack in the region of the protective cover from another perspective provided by the embodiment of the application.

[0022] Explanation of reference numerals: box 10, through hole 11, accommodating cavity 12, limiting groove 13, stepped assembly hole 15, waterproof and breathable film 20, protective cover 30, cover portion 31, first blocking portion 32, limiting portion 33, second blocking portion 34, pressure relief channel 40, first cavity 41, first notch 42, second cavity 43

[0023] Second notch 44, pressure ring 50, screw 60. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0025] Please refer to Figures 1 to 3 shown, Figure 1 is a structural schematic diagram of a battery pack provided by an embodiment of the present application, Figure 2 is an exploded structural schematic diagram of a battery pack in a region of a protective cover 30 provided by an embodiment of the present application, Figure 3 is a cross-sectional structural schematic diagram of a battery pack in a region of a protective cover 30 provided by an embodiment of the present application.

[0026] The present application protects a battery pack, which comprises 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 abnormally sprays gas, the battery box can quickly discharge the gas released by the battery to prevent the battery box from exploding due to excessive pressure.

[0027] The battery box comprises a box 10, a waterproof and breathable film 20 and a protective cover 30. The box 10 is provided with a through hole 11. An accommodating cavity 12 for accommodating the battery is formed in the inside of the box 10. The accommodating cavity 12 is in communication with the outside through the through hole 11. The number of the through holes 11 can be one or multiple. The through hole 11 can be circular, square, triangular or the like.

[0028] The waterproof and breathable film 20 is arranged on the side of the box body 10 away from the containing cavity 12 and covers the through hole 11. The waterproof and breathable film 20 is a new type of high polymer waterproof material, the spacing between gas molecules is large, and the gas molecules can pass through the air-permeable holes of the waterproof and breathable film 20 in the diffusion movement process. The spacing between liquid molecules is smaller than the spacing of the air-permeable holes, and under the action of surface tension, the liquid molecules cannot pass through the waterproof and breathable film 20, that is, the waterproof effect is achieved. The waterproof and breathable film 20 can ensure the circulation of air in the containing cavity 12 and external air, so as to ensure that the containing cavity 12 is always at the same atmospheric pressure as the outside. The waterproof and breathable film 20 can prevent external water vapor from entering the containing cavity 12, thereby causing corrosion and short circuit of the circuit.

[0029] The protective cover 30 includes a cover portion 31, a first blocking portion 32 and a limiting portion 33. The cover portion 31 is opposite to the through hole 11. The first blocking portion 32 is arranged on the cover portion 31. The cover portion 31, the first blocking portion 32 and the box body 10 form a first cavity 41. The first cavity 41 is in communication with the through hole 11 and the outside, respectively. The first blocking portion 32 presses the waterproof and breathable film 20. The limiting portion 33 is arranged in the first cavity 41 and connected with the cover portion 31. The limiting portion 33 and the waterproof and breathable film 20 are arranged in a spaced manner.

[0030] In the embodiment, the first blocking portion 32 is arranged on the cover portion 31. The cover portion 31, the first blocking portion 32 and the box body 10 form the first cavity 41. The protective cover 30 presses the waterproof and breathable film 20 to the box body 10 through the first blocking portion 32. The waterproof and breathable film 20 covers the through hole 11. The limiting portion 33 is arranged in the first cavity 41 and connected with the cover portion 31. The limiting portion 33 and the waterproof and breathable film 20 are arranged in a spaced manner. The protective cover 30 forms a limiting action on the waterproof and breathable film 20 through the limiting portion 33. The part of the waterproof and breathable film 20 that is raised is flattened to a range of a predetermined flatness, so as to avoid wrinkles of the waterproof and breathable film 20 in the installation process, thereby improving the waterproof and breathable effect.

[0031] The distance between the top surface of the limiting portion 33 and the cover portion 31 is L1 millimeters, and the distance between the top surface of the first blocking portion 32 and the cover portion 31 is L2 millimeters, 5≤L2-L1≤15, L2-L1 can be 5 millimeters, 6 millimeters, 7 millimeters, 8 millimeters, 9 millimeters, 10 millimeters, 11 millimeters, 12 millimeters, 13 millimeters, 14 millimeters, 15 millimeters, etc. In the present embodiment, the limiting portion 33 is arranged to be sunken relative to the first blocking portion 32, and within this range, it can be ensured that the limiting portion 33 limits the bulging part of the waterproof and breathable film 20, and ensures that the waterproof and breathable film 20 remains flat and does not wrinkle when the first blocking portion 32 fixes the waterproof and breathable film 20. When exceeding this range, the probability of the waterproof and breathable film 20 wrinkling during fixing increases, thereby affecting the waterproof and breathable effect of the waterproof and breathable film 20. When below this range, the precision requirement of the protective cover 30 is high, and in processing, it will increase the additional mold manufacturing cost to ensure that the limiting portion 33 is sunken relative to the first blocking portion 32.

[0032] The battery box further comprises a pressing ring 50, which is arranged between the first blocking portion 32 and the waterproof and breathable film 20, and the first blocking portion 32 presses the waterproof and breathable film 20 through the pressing ring 50. Specifically, the first blocking portion 32 presses the waterproof and breathable film 20 through the pressing ring 50. The pressing ring 50 is a ring structure with a circular hole in the middle, and the protective cover 30 applies pressure to the pressing ring 50, which in turn presses the waterproof and breathable film 20. The thickness and structural strength of the pressing ring 50 are much greater than those of the waterproof and breathable film 20, so the pressing ring 50 can well withstand the pressure of the first blocking portion 32 without being damaged. In addition, the pressing ring 50 has a larger contact area with the waterproof and breathable film 20, which can better press the waterproof and breathable film 20.

[0033] The protective cover 30 is connected with the box body 10 and presses the waterproof and breathable film 20, the protective cover 30 fixes the waterproof and breathable film 20, a pressure relief channel 40 is formed between the protective cover 30 and the box body 10 and communicates with the through hole 11, the pressure relief channel 40 is at least partially completely curved and forms an angle with the axis of the through hole 11 and penetrates the protective cover 30, the angle here can be an acute angle, a right angle or an obtuse angle, that is, the pressure relief channel 40 at least has a section not extending towards the axis direction of the through hole 11, so as to ensure that foreign matter cannot directly penetrate the pressure relief channel 40 to pierce the waterproof and breathable film 20 by gravity. In the axis direction of the through hole 11, at least a part of the extension track of the pressure relief channel 40 is not on the same line as the axis of the through hole 11, and the pressure relief channel 40 can be roundly or sharply transitioned. For example, the pressure relief channel 40 can form an L-shaped shape, at this time, the pressure relief channel 40 is sharply transitioned, in the process of pressure relief, the gas released by the battery first passes through the through hole 11 along the axis direction of the through hole 11, and then is sprayed out along the direction perpendicular to the axis of the through hole 11 under the guidance of the protective cover 30; the pressure relief channel 40 can form a spiral shape like a mountain road, in the process of pressure relief, the gas released by the battery first passes through the through hole 11 along the axis direction of the through hole 11, and then is sprayed out along the spiral pressure relief channel 40, at this time, the pressure relief channel 40 is roundly transitioned.

[0034] In the embodiment, the protective cover 30 presses the waterproof and breathable film 20 to the box body 10, the waterproof and breathable film 20 covers the through hole 11, and the pressure relief channel 40 is formed between the protective cover 30 and the box body 10 and communicates with the through hole 11. The pressure relief channel 40 is at least partially completely curved and forms an angle with the axis of the through hole 11 and penetrates the protective cover 30. When the battery works normally, the waterproof and breathable film 20 ensures that the containing cavity 12 and the outside only interact with air, and does not allow water vapor to enter. When the battery works abnormally, the gas released by the battery bursts the waterproof and breathable film 20 through the through hole 11 and is discharged along the pressure relief channel 40. The pressure relief channel 40 is thus arranged, so that when the foreign matter falls by gravity and hits the protective cover 30, the protective cover 30 can bear the impact from the axis direction of the through hole 11, so as to avoid that the waterproof and breathable film 20 is poked and broken and fails.

[0035] Please refer to Figures 1 to 4 as shown, Figure 4 which is a structural schematic view of the protective cover 30 provided by the embodiment of the application.

[0036] The pressure relief channel 40 includes a first cavity 41 and a first notch 42.

[0037] The first blocking part 32 is provided with a first gap 42, the cover part 31 is opposite to the through hole 11 in the axial direction of the through hole 11, the first blocking part 32 is arranged on the cover part 31, the cover part 31 is arranged in the first cavity 41 through the first blocking part 32 and the through hole 11, the first blocking part 32 can press the waterproof and breathable film 20, the cover part 31, the first blocking part 32 and the box body 10 form the first cavity 41, the first blocking part 32 is provided with the first gap 42, and the first cavity 41 is respectively communicated with the through hole 11 and the first gap 42.

[0038] In the embodiment, after the battery abnormally releases gas, the gas is first discharged through the through hole 11, then to the first cavity 41, and finally through the first gap 42. The cover part 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 and breathable film 20 from impact from the direction of gravity. In the direction perpendicular to the axial direction of the through hole 11, the first gap 42 on the first blocking part 32 allows the gas released by the battery to be discharged, and the first blocking part 32 can block foreign matter from entering the first cavity 41 to damage the waterproof and breathable film 20, thereby reducing the risk of damage to the waterproof and breathable film 20 while allowing the gas released by the battery to pass normally.

[0039] Further, the pressure relief channel 40 includes a second cavity 43 and a second gap 44.

[0040] The protective cover 30 includes a second blocking part 34, which is arranged on the cover part 31 and spaced apart from the first blocking part 32 to form the second cavity 43, and the second blocking part 34 is located on the side of the first blocking part 32 away from the through hole 11, and the second blocking part 34 is provided with the second gap 44, the first gap 42 is opposite to the second blocking part 34, and the second gap 44 is opposite to the first blocking part 32. In the direction perpendicular to the axial direction of the through hole 11, the projection of the first gap 42 on the second blocking part 34 does not coincide with the first gap 42, and the projection of the second gap 44 on the first blocking part 32 does not coincide with the second gap 44, and the first gap 42 and the second gap 44 form an interleaved arrangement. In this way, when foreign matter is inserted into the protective cover 30 through the second gap 44, it will be blocked by the first blocking part 32 from entering the first cavity 41, so as to avoid the foreign matter from contacting the waterproof and breathable film 20 and piercing the waterproof and breathable film 20. When the battery is abnormal, because the first gap 42 is communicated through the second cavity 43 and the second gap 44, the gas released by the battery first enters the first cavity 41, then passes through the first gap 42 to enter the second cavity 43, and finally enters the second gap 44 from the second cavity 43 and is discharged.

[0041] In the present embodiment, the first blocking portion 32 and the second blocking portion 34 are arranged on the cover portion 31 at intervals, the first notch 42 and the second notch 44 are arranged on the first blocking portion 32 and the second blocking portion 34 respectively, the first notch 42 and the second notch 44 are staggered with each other, the second notch 44 cannot be seen from the first notch 42, the first notch 42 cannot be seen from the second notch 44, the external hard object passing through the second notch 44 is blocked by the first blocking portion 32, and then cannot enter the first cavity 41 to damage the waterproof and breathable membrane 20. The first notch 42 and the second notch 44 are communicated through the second cavity 43 to ensure the normal circulation of the gas released by the battery, thereby ensuring the functions of the waterproof and breathable membrane 20, i.e. the ventilation and water blocking functions in the normal use of the battery and the smooth discharge function of the gas released by the battery in the abnormal use of the battery.

[0042] The number of the first notches 42 can be multiple, the multiple first notches 42 are uniformly distributed around the axis of the through hole 11, each of the first notches 42 can allow the gas released by the battery to pass through, and the multiple first notches 42 allow the gas released by the battery to be sprayed out from different directions. When the first notch 42 in one of the directions is blocked, the first notches 42 in the remaining directions can ensure the continuous discharge of the gas released by the battery. In addition, the uniform discharge of the gas released by the battery in multiple directions can also ensure that the protective cover 30 is subjected to balanced pressure and avoid the phenomenon of fatigue damage due to continuous force in a single direction.

[0043] Of course, the multiple first notches 42 can also be arranged non-uniformly according to the calculation of the pressure relief area of the actual product structure.

[0044] The protective cover 30 further comprises multiple limiting portions 33, the multiple limiting portions 33 are arranged in the first cavity 41 in a cross manner and are connected with the cover portion 31 and the first blocking portion 32 respectively. The multiple limiting portions 33 divide the first cavity 41 into multiple small cavities, the small cavities are communicated with the corresponding first notches 42 to form multiple independent small passages. The gas released by the battery passing through the through hole 11 enters the small cavities and is discharged through the first notches 42, and the gas released by the battery in the adjacent small cavities does not affect each other, thereby ensuring the normal circulation of each passage.

[0045] In addition, the limiting portion 33 can also form a reinforcing effect on the cover portion 31 located at the first cavity 41 to improve the local strength of the cover portion 31 so as to withstand greater impact force. The limiting portion 33 can also form a reinforcing effect on the first blocking portion 32 to improve the local strength of the first blocking portion 32 so as to withstand greater impact force.

[0046] 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 battery release gas to be discharged, and the multiple second notches 44 allow the battery release gas to be discharged from different directions. When one of the second notches 44 in one direction is blocked, the remaining second notches 44 in other directions can ensure the continuous discharge of the battery release gas. In addition, the uniform discharge of the battery release gas in multiple directions can also ensure that the protective cover 30 is subjected to balanced pressure, avoiding the phenomenon of labor damage due to continuous force in a single direction.

[0047] Of course, the multiple second notches 44 can also be unevenly arranged according to the actual product structure to calculate the pressure relief area to arrange the second notches 44.

[0048] Specifically, Figure 2 and Figure 3 The box body 10 is recessed on the side away from the containing cavity 12 to form a limiting groove 13, the through hole 11 is arranged in the limiting groove 13, the through hole 11 is located on the bottom wall of the limiting groove 13, the waterproof and breathable film 20 is arranged in the limiting groove 13, and the side wall of the limiting groove 13 limits the waterproof and breathable film 20, so as to ensure that the waterproof and breathable film 20 covers the through hole 11. The first blocking portion 32 is inserted into the limiting groove 13 to press the waterproof and breathable film 20, the groove wall of the limiting groove 13 limits the first blocking portion 32, so as to ensure the correct assembly of the protective cover 30 and ensure that the first blocking portion 32 can press the waterproof and breathable film 20, and the second blocking portion 34 is in contact with the appearance surface of the box body 10.

[0049] In the embodiment, the limiting groove 13 limits the waterproof and breathable film 20 to ensure that the waterproof and breathable film 20 faces the through hole 11, and the limiting groove 13 limits the first blocking portion 32 to ensure that the first blocking portion 32 can press the waterproof and breathable film 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.

[0050] The first blocking portion 32 and the side wall of the limiting groove 13 are spaced apart, the first blocking portion 32 and the side wall of the limiting groove 13 form a third cavity, the second cavity 43 and the third cavity are communicated, and the first blocking portion 32 and the side wall of the limiting groove 13 have a space allowing the battery release gas to flow, thereby increasing the flow speed of the battery release gas.

[0051] Further, the side wall and the bottom wall of the limiting groove 13 are provided with a step 14, and the first blocking portion 32 is opposite to the side wall of the step 14. The free end of the first blocking portion 32 is more deeply inserted into the limiting groove 13 than the top surface of the step 14, and the side wall of the step 14 can block the contact between the first blocking portion 32 and the side wall of the limiting groove 13, thereby ensuring the smoothness of the third cavity.

[0052] In another embodiment, the pressure relief channel 40 has the same axial direction as the opening of the protective cover 30 and 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 communicates with the through hole 11, and the last section forms an opening through the protective cover 30, 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 to extend in the protective cover, such as a fold line extension, a spiral extension, etc. The axial direction of the pressure relief channel 40 of the middle section and the through hole 11 forms an angle.

[0053] Please refer to Figure 5 shown, Figure 5 is a cross-sectional structure schematic diagram of the battery pack in another view of the protective cover 30 region provided by the embodiment of the application.

[0054] The battery box further comprises a screw 60, the box body 10 is provided with an assembly hole 15, the screw 60 is arranged through the assembly hole 15 and connected to the side of the protective cover 30 facing the containing cavity 12. The screw 60 passes through the assembly hole 15 from the side of the box body 10 facing the containing cavity 12 and is connected to the protective cover 30, the screw 60 does not penetrate the protective cover 30, and the top surface of the protective cover 30 away from the containing cavity 12 is a complete surface, thereby preventing the screw 60 from being corroded by water vapor. The screw 60 detachably connects the protective cover 30 and the box body 10 together, and after the gas released by the failed battery breaks through the waterproof and breathable film 20 and causes the waterproof and breathable film 20 to fail, the screw 60 can be removed, the protective cover 30 can be separated, and the new waterproof and breathable film 20 can be replaced.

[0055] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the application are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture, and if the specific posture changes, the directional indications also change accordingly.

[0056] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can be indirectly connected to the other element through a middle element.

[0057] In addition, the descriptions involving "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0058] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made on the basis of the inventive concept of the present application, and the contents of the specification and drawings, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery box characterized by, The battery box further comprises: a box body having a through hole, an accommodating cavity for accommodating a battery being formed in 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; a protective cover comprising a cover portion, a first blocking portion and a limiting portion, the cover portion being opposite to the through hole, the first blocking portion being arranged on the cover portion, a first cavity being formed between the cover portion, the first blocking portion and the box body, the first cavity being in communication with the through hole and the outside respectively, the first blocking portion pressing the waterproof and breathable membrane, the limiting portion being arranged in the first cavity and connected with the cover portion, the limiting portion and the waterproof and breathable membrane being arranged in a spaced manner.

2. The battery pack of claim 1, wherein, A distance between a top surface of the limiting portion and the cover portion is L1 millimeters, a distance between a top surface of the first blocking portion and the cover portion is L2 millimeters, and 5≤L2-L1≤15.

3. The battery pack of claim 1, wherein, The battery box further comprises a compression ring arranged between the first blocking portion and the waterproof and breathable membrane, the first blocking portion pressing the waterproof and breathable membrane through the compression ring.

4. The battery pack of claim 1, wherein, The limiting portion is in a plurality, and the plurality of limiting portions are arranged in the first cavity in a crossed manner and connected with the first blocking portion.

5. The battery pack of claim 1, wherein, The first blocking portion has a first notch, and the first cavity is in communication with the through hole and the first notch respectively.

6. The battery pack of claim 5, wherein, The protective cover comprises a second blocking portion arranged on the cover portion and arranged in a spaced manner with the first blocking portion to form a second cavity, the second blocking portion has a second notch, the first notch is opposite to the second blocking portion, and the second notch is opposite to the first blocking portion.

7. The battery pack of claim 6, wherein, A limiting groove is recessed on a side of the box body away from the accommodating cavity, the through hole is arranged in the limiting groove, the waterproof and breathable membrane is arranged in the limiting groove, the first blocking portion is arranged in the limiting groove, and the second blocking portion is in contact with an appearance surface of the box body.

8. The battery pack of claim 7, wherein, The first blocking portion and a side wall of the limiting groove are arranged in a spaced manner.

9. The battery pack of claim 8, wherein, A step is arranged between the side wall and a bottom wall of the limiting groove, and the first blocking 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 screw, the box body has an assembly hole, the screw is arranged through the assembly hole and connected with a side of the protective cover facing the accommodating cavity.

11. A battery pack, characterized by The battery pack comprises a battery and the battery box according to any one of claims 1 to 10, and the battery is assembled in the battery box.

Images