Battery box and battery pack

Abstract

The invention discloses a battery box and a battery pack. The battery box comprises a box body, a box cover and a sealing ring, wherein an opening is formed in one end of the box body; the box cover comprises a first part and a second part, the second part is connected to the side, close to the box body, of the first part, the first part covers the opening and defines a containing space with the box body, and the second part is embedded into the containing space; and the sealing ring is sleeved on the second part and is clamped between the inner side surface of the box body and the second part. Compared with the prior art, the box cover and the box body are more convenient to disassemble and assemble, the sealing performance is good, and the thin-wall design of the box body is facilitated.

Description

Technical Field

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

[0002] For integration considerations, single cells are usually connected in series and parallel through aluminum bars to form energy storage modules, which are then loaded into boxes to form battery packs for application. In order to facilitate the placement of energy storage modules, the box body consists of a box shell and a box cover. The box cover is set at the opening of the box shell to form a storage space, and the energy storage module is loaded in the storage space.

[0003] The general method currently adopted by the industry is to abut the edge of the box cover with the box shell and fix it with glue at the abutment point to achieve a waterproof and sealing effect. However, the connection method of fixing with glue will cause difficulties in maintenance. In addition, the gluing method is difficult to ensure the consistency of the gluing effect during large-scale production. Summary of the invention

[0004] An object of the present invention is to provide a battery box and a battery pack, which are intended to solve the technical problem of the inconvenience in fixing the box cover and the box body in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention provides a solution: a battery box, which includes a box body, a box cover and a sealing ring: an opening is formed at one end of the box body; the box cover includes a first part and a second part, the second part is connected to a side of the first part close to the box body, the first part seals the opening and is combined with the box body to form an accommodating space, and the second part is embedded in the accommodating space; the sealing ring is sleeved on the second part and clamped between the inner side surface of the box body and the second part.

[0006] In some embodiments of the present application, the battery box further includes a positioning member, a first positioning hole is formed on the box body near the opening, and the positioning member passes through the first positioning hole and is connected to the first part.

[0007] In some embodiments of the present application, the box body includes multiple side panels and a bottom panel, the side panels and the bottom panel together form the box body, the opening is located at one end of the side panel away from the bottom panel, adjacent side panels are connected by arcs, the inner curvature radius of the arc is R1, R1 ≥ 5 mm; and / or, the thickness of the side panel is L1, L1 ≤ 2 mm.

[0008] In some embodiments of the present application, the gap between the second portion and the inner side surface of the box body is L2, and the maximum thickness of the sealing ring in a natural state is L0, L2<L0.

[0009] In some embodiments of the present application, the sealing ring includes a ring and at least one sub-ring, the ring is arranged on the second part, the sub-ring is arranged on the side of the ring away from the second part, and an escape space is formed between adjacent sub-rings or between the sub-ring and the ring.

[0010] In some embodiments of the present application, at least two sub-circles include a first circle and a second circle, the thickness of the circle is L3, L3<L2, the thickness of the first circle is L4, the thickness of the second circle is L5, L3+L4>L2, L5+L3>L2.

[0011] In some embodiments of the present application, at least two sub-circles include a first circle and a second circle, the second circle is located on a side of the first circle away from the first portion, the thickness of the first circle is L4, the thickness of the second circle is L5, and L5<L4.

[0012] In some embodiments of the present application, a slot is provided on the second portion; the sealing ring includes a buckle and a trap, the trap is sleeved on the second portion, and the buckle is provided on the inner surface of the trap and embedded in the slot.

[0013] In some embodiments of the present application, a cover space is formed in the second part; the card slot includes a first slot and a second slot, the second slot is connected to the first slot, the first slot runs through the edge of the second part, the first slot and the second slot are both connected to the cover space, the width of the first slot is L6, and the width of the second slot is L7; the buckle includes a first sub-buckle and a second sub-buckle, the second sub-buckle is connected to the trap through the first sub-buckle, the first sub-buckle is embedded in the second slot, and the second sub-buckle is arranged in the cover space, the width of the first sub-buckle is L8, and the width of the second sub-buckle is L9; L6<L8≤L7<L9.

[0014] In some embodiments of the present application, the outer diameter of the first portion is greater than the outer diameter of the second portion, and a side of the sealing ring close to the first portion abuts against the first portion.

[0015] In order to achieve the above-mentioned object, a solution provided by the present invention is: a battery pack, which includes a single battery and any one of the battery boxes described above, and the single battery is arranged in the accommodating space.

[0016] The beneficial effects of the present invention are:

[0017] The box cover comprises a second part embedded in the accommodating space, a sealing ring is sleeved on the second part, and is sandwiched between the inner side surface of the box body and the second part.

[0018] This brings the following advantages: On the one hand, the box cover and the box body of the present application are sealed by a sealing ring, which is more convenient to disassemble and repair than fixing with glue. On the other hand, the second part of the present application is inserted into the opening; further, the contact surface between the box body and the box cover is the inner surface of the box body rather than the end surface, and the wall thickness of the box body of the present application can be thinner. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 is a schematic diagram of the overall structure of a battery box provided by an embodiment of the present invention;

[0021] Figure 2 It is a schematic diagram of the matching relationship between the box cover and the sealing ring provided in an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 A partial enlarged view of the middle A area;

[0023] Figure 4 is along Figure 1 Schematic diagram of the cross section of the middle BB line;

[0024] Figure 5 yes Figure 4 A partial enlarged view of the middle C area;

[0025] Figure 6 is a partial detail diagram of a box cover provided by an embodiment of the present invention;

[0026] Figure 7 It is a partial detail diagram of the sealing ring provided in the embodiment of the present invention.

[0027] Description of Figure Numbers:

[0028] 10. Box body; 11. Opening; 12. Side panel; 121. First positioning hole; 13. Bottom plate; 20. Box cover; 21. First part; 211. Second positioning hole; 22. Second part; 221. Slot; 2211. First slot; 2212. Second slot; 222. Cover plate space; 30. Accommodating space; 40. Sealing ring; 41. Loop; 42. First ring; 43. Second ring; 44. Buckle; 441. First sub-buckle; 442. Second sub-buckle; 50. Positioning piece. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1 and Figure 2 As shown, Figure 1 is a schematic diagram of the overall structure of a battery box provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the matching relationship between the box cover 20 and the sealing ring 40 provided in an embodiment of the present invention.

[0031] An embodiment of the present invention discloses a battery box, which includes a box body 10, a box cover 20 and a sealing ring 40: an opening 11 is formed at one end of the box body 10; the box cover 20 includes a first part 21 and a second part 22, the second part 22 is connected to a side of the first part 21 close to the box body 10, the first part 21 covers the opening 11 and encloses the box body 10 to form a accommodating space 30, and the second part 22 is embedded in the accommodating space 30; the sealing ring 40 is sleeved on the second part 22, and is clamped between the inner side surface of the box body 10 and the second part 22.

[0032] For the sake of clarity, a preferred installation method of the battery box of this embodiment is described here: provide a box cover 20, a sealing ring 40 and a box body 10; sleeve the sealing ring 40 on the second part 22 area of ​​the box cover 20; snap the box cover 20 into the opening 11 of the box body 10, so that the second part 22 is embedded in the accommodating space 30, and the second part 22 and the inner side of the box body 10 are sandwiched with a sealing ring 40. When it is necessary to open the box for inspection, just pull out the box cover 20 and the sealing ring 40 together, and buckle them back in the original way after the inspection is completed. It should be noted that the above-mentioned implementation method is only an application example of this embodiment, and the protection scope of this application cannot be limited accordingly.

[0033] Compared with the prior art, on the one hand, the provision of the sealing ring 40 makes the battery box of this embodiment more convenient to assemble and disassemble. The installation process can be completed without waiting for the sealant to cure, and there is no need to consider the influence of residual glue on the secondary seal during disassembly. On the other hand, the box body 10 and the box cover 20 of the prior art abut against each other in the buckling direction of the box cover 20, and the fixation of the relative position of the box cover 20 and the box body 10 requires additional fixings. The second part 22 of this embodiment can be fastened after being inserted into the accommodating space 30. If necessary, the fixings can be eliminated to achieve a simpler structure. In addition, in the prior art, the sealing surfaces of the box body 10 and the box cover 20 are abutment surfaces, that is, the area of ​​the sealing surface is limited by the wall thickness of the box body 10. When the box body 10 is too thin, the sealing of the battery box will be affected. In the present embodiment, the relative sealing surfaces of the box body 10 and the box cover 20 are side surfaces. Specifically, the inner side surface of the box body 10 and the outer side surface of the second part 22 are sealed via a sealing ring 40. The area of ​​the sealing surface has nothing to do with the wall thickness of the box body 10. Therefore, the box body 10 can be configured with a thinner wall thickness, which reduces the dead weight of the battery box while increasing the cell volume and energy density of the finished battery pack.

[0034] It should be understood that the sealing ring 40 can have various shapes, and the cross-section can be circular, elliptical, rectangular, etc., or it can be in the form of multiple sub-rings protruding on a substrate; the sealing ring 40 can be a circular ring in its natural state, or it can be a preset shape according to the shape of the second part 22.

[0035] In some embodiments of the present application, the battery box further includes a positioning member 50 . A first positioning hole 121 is formed on the box body 10 near the opening 11 . The positioning member 50 passes through the first positioning hole 121 and is connected to the first portion 21 .

[0036] The setting of the positioning member 50 ensures the relative shape of the box body 10 and the box cover 20, especially when the wall thickness of the box body 10 is reduced, the multiple positioning members 50 evenly distributed around the circumference of the first part 21 can effectively curb the tendency of deformation of the edge of the opening 11 of the box body 10, ensuring that the box body 10 can stably clamp the sealing ring 40 with the second part 22, thereby ensuring good sealing of the battery box.

[0037] Exemplarily, a first positioning hole 121 is opened on the box body 10, and a second positioning hole 211 is opened on the first part 21. The positioning member 50 is preferably a screw that matches the thread of the second positioning hole 211. The positioning member 50 passes through the first positioning hole 121 and cooperates with the second positioning hole 211, so that the box body 10 is tightened in the direction close to the box cover 20, and the box body 10 and the box cover 20 clamp the sealing ring 40 to optimize the sealing effect of the battery box.

[0038] Please also read Figures 3 to 5 As shown, Figure 3 yes Figure 1 A partial enlarged view of the middle A area; Figure 4 is along Figure 1 Schematic diagram of the cross section of the middle BB line; Figure 5 yes Figure 4 A partial enlarged view of the middle C area.

[0039] In some embodiments of the present application, the box body 10 includes a plurality of side panels 12 and a bottom panel 13, the side panels 12 and the bottom panel 13 together form the box body 10, the opening 11 is located at one end of the side panel 12 away from the bottom panel 13, adjacent side panels 12 are connected by an arc, the inner curvature radius of the arc is R1, R1 ≥ 5 mm; and / or the thickness of the side panel 12 is L1, L1 ≤ 2 mm.

[0040] The smaller R1 is, the smaller the space redundancy is when the battery boxes are densely stacked. However, if R1 is too small, it will be difficult for the sealing ring 40 to squeeze into the angle between the adjacent two side panels 12. R1≥5mm, on the one hand, ensures that the sealing ring 40 and the angle between the side panels 12 fit tightly, and no additional mold is required to produce special-shaped sealing rings 40. On the other hand, it can also maintain the structural strength of the box 10 after the wall thickness of the box 10 is thinned, and prevent the box 10 from cracking at the side edges. L1≤2mm can reduce the weight of the box 10, increase the weight of the battery cells, circuit boards and other structures in the battery pack, and improve the energy density of the battery pack.

[0041] In some embodiments of the present application, the gap between the second portion 22 and the inner side surface of the box body 10 is L2, and the maximum thickness of the sealing ring 40 in a natural state is L0, L2<L0.

[0042] The gap between the second portion 22 and the inner side of the box body 10 is smaller than the maximum thickness of the sealing ring 40 in the natural state, that is, after the box cover 20 and the box body 10 are assembled in place, the sealing ring 40 is interference fit with the box body 10 and the box cover 20, and the sealing ring 40 is compressed and deformed, and spontaneously extends, filling the possible airtight holes while increasing the cross-sectional area of ​​the sealing surface, thereby enhancing the sealing effect. In addition, the interference fit sealing ring 40 also increases the difficulty of the box cover 20 to be disengaged, and the relative position relationship between the box cover 20 and the box body 10 can be maintained to a certain extent without additionally setting the positioning member 50.

[0043] Furthermore, the sealing ring 40 includes a ring 41 and at least one sub-ring. The ring 41 is sleeved on the second part 22, and the sub-ring is sleeved on a side of the ring 41 away from the second part 22. An escape space is formed between the first ring 42 and the second ring 43 or between the sub-ring and the ring 41.

[0044] On the one hand, the overall sealing ring 40 is divided into a loop 41 and a plurality of sub-rings. Compared with an overall sealing ring 40 of uniform size, the difficulty of inserting the sealing ring 40 is reduced, the pressure required for assembly is reduced, and the probability of deformation of the box body 10 is reduced. On the other hand, an avoidance space is formed between adjacent sub-rings. When the sub-rings are deformed, the sealing ring 40 can extend a larger sealing surface. Specifically, when the middle area of ​​the overall sealing ring 40 is about to extend to both sides, it will be restricted by the areas on both sides of itself, and it will be difficult to expand due to the existence of internal stress. In this embodiment, the deformation area is divided into a plurality of sub-rings, the internal stress of the sealing ring 40 is reduced, and the deformation amount under the same pressure is larger, which can achieve a better sealing effect.

[0045] It can be imagined that although the drawings of this embodiment only show two sub-circles, technicians in this field can set the first circle and the second circle without creative work, and continue to stack the third circle, the fourth circle, etc., which also falls within the scope of protection of this application.

[0046] Furthermore, at least two sub-rings include a first ring 42 and a second ring 43, the thickness of the ring 41 is L3, L3<L2, the thickness of the first ring 42 is L4, the thickness of the second ring 43 is L5, L3+L4>L2, L5+L3>L2.

[0047] The thickness of the snare 41 is smaller than the gap between the second portion 22 and the inner side surface of the box body 10, that is, without considering the deformation of the first circle 42 and the second circle 43, there is a gap between the snare 41 and the box body 10, which ensures that the resistance of the first circle 42 and the second circle 43 in the process of deformation toward the avoidance space is small, and the avoidance space can play its effect of releasing internal stress.

[0048] Optionally, the at least two sub-circles include a first circle 42 and a second circle 43 , the second circle 43 is located on a side of the first circle 42 away from the first portion 21 , the thickness of the first circle 42 is L4 , the thickness of the second circle 43 is L5 , and L5<L4.

[0049] The thickness of the second circle 43 is smaller than that of the first circle 42, and the second circle 43 is located on the side of the first circle 42 away from the first part 21. This makes it possible that in a natural state, the theoretical resistance encountered by the second circle 43 when inserted into the box body 10 is smaller than the theoretical resistance encountered by the first circle 42 when inserted into the box body 10. When the first circle 42 is inserted into the box body 10, due to the positioning effect of the second circle 43, the insertion resistance encountered by the first circle 42 is smaller than the theoretical value of directly inserting the first circle 42. Therefore, in the process of inserting the sealing ring 40 into the box body 10, the resistances encountered by the first circle 42 and the second circle 43 are relatively balanced, thereby reducing the risk of the edge of the box body 10 being squeezed and unstable.

[0050] In some embodiments of the present application, a slot 221 is formed on the second portion 22 ; the sealing ring 40 includes a buckle 44 and a trap 41 , the trap 41 is sleeved on the second portion 22 , the buckle 44 is disposed on the inner surface of the trap 41 and embedded in the slot 221 .

[0051] The cooperation between the slot 221 and the buckle 44 enables the sealing ring 40 to fit tightly against the second portion 22. During the actual assembly process, it is only necessary to hold the box cover 20 and buckle it onto the box body 10. There is no need to clamp the sealing ring 40 additionally, which reduces the difficulty of assembly.

[0052] Please refer to Figure 6 and Figure 7 As shown, Figure 6 is a partial detail diagram of the box cover 20 provided in an embodiment of the present invention; Figure 7 It is a partial detail diagram of the sealing ring 40 provided in the embodiment of the present invention.

[0053] Furthermore, a cover space 222 is formed in the second part 22; the slot 221 includes a first slot 2211 and a second slot 2212, the second slot 2212 is connected to the first slot 2211, the first slot 2211 runs through the edge of the second part 22, the first slot 2211 and the second slot 2212 are both connected to the cover space 222, the width of the first slot 2211 is L6, and the width of the second slot 2212 is L7; the buckle 44 includes a first sub-buckle 441 and a second sub-buckle 442, the second sub-buckle 442 is connected to the snare 41 through the first sub-buckle 441, the first sub-buckle 441 is embedded in the second slot 2212, the second sub-buckle 442 is arranged in the cover space 222, the width of the first sub-buckle 441 is L8, and the width of the second sub-buckle 442 is L9; L6<L8≤L7<L9.

[0054] This embodiment provides a specific structure of a slot 221 and a buckle 44, wherein the first buckle 441 is embedded in the second slot 2212, and the second buckle 442 is disposed in the cover plate space 222, which makes it difficult for the buckle 44 to escape from the slot 221, thereby ensuring a stable connection between the sealing ring 40 and the box cover 20.

[0055] In some embodiments of the present application, the outer diameter of the first portion 21 is greater than the outer diameter of the second portion 22 , and the side of the sealing ring 40 close to the first portion 21 abuts against the first portion 21 .

[0056] The outer diameter of the first part 21 is greater than the outer diameter of the second part 22. After the battery box is assembled, one side surface of the sealing ring 40 is still in contact with the first part 21. That is, when the box cover 20 is buckled on the box body 10, the sealing ring 40 is pushed by the first part 21 in the buckling direction of the box cover 20, thereby preventing the sealing ring 40 from slipping in a direction relatively away from the second part 22.

[0057] The outer diameter here should be understood as the outer contour intercept of the first portion 21 and the second portion 22 , and does not limit the cross-section of the first portion 21 and the second portion 22 to be circular.

[0058] In order to solve the defects of the existing battery box structure that it is difficult to assemble and has a thick wall, the present invention also discloses a battery pack, which includes a single battery and any of the above-mentioned battery boxes, and the single battery is arranged in the accommodating space 30.

[0059] Because the disclosed battery pack includes the battery box disclosed in the above embodiment, and the single cell is accommodated in the accommodation space 30 for arranging the single cell, the battery pack of this embodiment also has the technical effect of the battery box of the above embodiment. Specifically, on the one hand, the battery pack does not need additional fixing parts when assembling, and only the box cover 20 is set on the box body 10, so that the second part 22 is embedded in the accommodation space 30, and the box cover 20 and the box body 10 are sandwiched with a sealing ring 40 to achieve the fixing of the relative position of the box cover 20 and the box body 10, and ensure the sealing of the accommodation space 30, to prevent the electrolyte from leaking out or the external gas and liquid from entering the battery box; on the other hand, the side of the sealing ring 40 away from the box cover 20 abuts against the inner surface of the box body 10. Compared with the existing technical solution in which the box cover 20 abuts against the box body 10 in the buckling direction of the box cover 20, the end face design of the box body 10 of the present application does not need to take into account the setting of the sealing ring 40, and a thinner wall thickness can be configured as needed.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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 design 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: include: A box body, one end of which forms an opening; The box cover comprises a first part and a second part, wherein the second part is connected to a side of the first part close to the box body, the first part covers the opening and is surrounded by the box body to form an accommodating space, and the second part is embedded in the accommodating space; A sealing ring is sleeved on the second part and sandwiched between the inner side surface of the box body and the second part.

2. The battery box according to claim 1, characterized in that: The battery box further comprises a positioning member, a first positioning hole is formed on the box body near the opening, and the positioning member passes through the first positioning hole and is connected to the first part.

3. The battery box according to claim 1, characterized in that: The box body comprises a plurality of side panels and a bottom panel, the side panels and the bottom panel are combined to form the box body, the opening is located at one end of the side panel away from the bottom panel, adjacent side panels are connected by arcs, the inner curvature radius of the arc is R1, R1 ≥ 5 mm; and / or The thickness of the side plate is L1, L1≤2mm.

4. The battery box according to claim 1, characterized in that: The gap between the second portion and the inner side surface of the box body is L2, and the maximum thickness of the sealing ring in a natural state is L0, L2<L0.

5. The battery box according to claim 4, characterized in that: The sealing ring includes a ring and at least one sub-ring, the ring is sleeved on the second part, the sub-ring is sleeved on a side of the ring away from the second part, and an escape space is formed between adjacent sub-rings or between the sub-ring and the ring.

6. The battery box according to claim 5, characterized in that: At least two of the sub-circles include a first circle and a second circle, the thickness of the circle is L3, L3<L2, the thickness of the first circle is L4, the thickness of the second circle is L5, L3+L4>L2, L5+L3>L2.

7. The battery box according to claim 5, characterized in that: The at least two sub-circles include a first circle and a second circle, the second circle is located on a side of the first circle away from the first portion, the thickness of the first circle is L4, the thickness of the second circle is L5, and L5<L4.

8. The battery box according to any one of claims 1 to 7, characterized in that: The second part is provided with a card slot; The sealing ring comprises a buckle and a trap, wherein the trap is sleeved on the second portion, and the buckle is arranged on the inner surface of the trap and embedded in the slot.

9. The battery box according to claim 8, characterized in that: A cover plate space is formed in the second portion; The card slot includes a first slot and a second slot, the second slot is connected to the first slot, the first slot passes through the edge of the second portion, the first slot and the second slot are both connected to the cover plate space, the width of the first slot is L6, and the width of the second slot is L7; The buckle comprises a first buckle and a second buckle, the second buckle is connected to the trap through the first buckle, the first buckle is embedded in the second groove, the second buckle is arranged in the cover plate space, the first buckle has a width of L8, and the second buckle has a width of L9; L6<L8≤L7<L9.

10. The battery box according to any one of claims 1 to 7, characterized in that: The outer diameter of the first part is greater than the outer diameter of the second part, and the side of the sealing ring close to the first part abuts against the first part.

11. A battery pack, characterized in that: include: The battery box according to any one of claims 1 to 10; The single battery is arranged in the accommodating space.

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