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 box cover and a sealing ring, wherein an opening is formed at 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] This utility model relates to the field of energy storage equipment technology, and in particular to a battery box and battery pack. Background Technology

[0002] For integration purposes, individual batteries are typically connected in series and parallel via aluminum busbars to form energy storage modules, which are then loaded into a housing to create a battery pack for application. To facilitate the placement of the energy storage modules, the housing consists of two parts: a casing and a cover. The cover is positioned over the opening of the casing to create an accommodating space, within which the energy storage modules are housed.

[0003] The current industry practice is to fit the lid to the edge of the casing and then apply sealant to the joint to achieve a waterproof seal. However, this sealant-based method makes maintenance difficult, and it's also challenging to ensure consistent sealant application during mass production. Utility Model Content

[0004] One objective of this utility model is to provide a battery box and battery pack, which aims to solve the technical problem of inconvenient fixing of the box cover and the box body in the prior art.

[0005] To achieve the above objectives, the present invention provides a solution as follows: a battery box, comprising a box body, a box cover, and a sealing ring: one end of the box body forms an opening; the box cover comprises a first part and a second part, the second part being connected to the side of the first part near the box body, the first part sealing the opening and enclosing the box body to form an accommodating space, the second part being embedded in the accommodating space; the sealing ring is sleeved on the second part and sandwiched between the inner side of the box body and the second part.

[0006] In some embodiments of this application, the battery box further includes a positioning member, and a first positioning hole is provided 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 this application, the box body includes multiple side plates and a bottom plate, the side plates and the bottom plate together form the box body, the opening is located at the end of the side plate away from the bottom plate, adjacent side plates are connected by an arc, the inner radius of curvature of the arc is R1, R1≥5mm; and / or, the thickness of the side plate is L1, L1≤2mm.

[0008] In some embodiments of this application, the gap between the second part and the inner side of the housing is L2, and the maximum thickness of the sealing ring in its natural state is L0, where L2 < L0.

[0009] In some embodiments of this application, the sealing ring includes a sleeve and at least one sub-ring. The sleeve is fitted onto the second part, and the sub-ring is fitted onto the side of the sleeve away from the second part. An avoidance space is formed between adjacent sub-rings or between the sub-ring and the sleeve.

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

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

[0012] In some embodiments of this application, a slot is provided on the second part; the sealing ring includes a buckle and a sleeve, the sleeve is fitted on the second part, and the buckle is disposed on the inner surface of the sleeve and embedded in the slot.

[0013] In some embodiments of this application, a cover space is formed in the second part; the 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 part, and both the first slot and the second slot are 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 loop through the first sub-buckle, the first sub-buckle is embedded in the second slot, and the second sub-buckle is set 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 this application, the outer diameter of the first part is larger than the outer diameter of the second part, and the sealing ring abuts against the first part on the side closest to the first part.

[0015] To achieve the above objectives, the present invention provides a solution: a battery pack, which includes individual batteries and a battery box as described above, wherein the individual batteries are disposed within the accommodating space.

[0016] The beneficial effects of this utility model are as follows:

[0017] The lid includes a second part embedded in the accommodating space, a sealing ring fitted onto the second part, and sandwiched between the inner side of the box and the second part.

[0018] This brings the following advantages: Firstly, the lid and body of the box are sealed with a sealing ring, which makes disassembly and maintenance more convenient compared to fixing with glue. Secondly, the second part in this application is inserted into the opening; furthermore, the surface in contact between the box body and the lid is the inner surface of the box body rather than the end face, allowing for a thinner and lighter box body. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery box provided in this embodiment of the utility model;

[0021] Figure 2 This is a schematic diagram showing the fit between the box cover and the sealing ring provided in this embodiment of the utility model;

[0022] Figure 3 yes Figure 2 A magnified view of a portion of region A in the middle;

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

[0024] Figure 5 yes Figure 4 A magnified view of a portion of region C in the middle;

[0025] Figure 6 This is a partial detail view of the box lid provided in an embodiment of this utility model;

[0026] Figure 7 This is a partial detail view of the sealing ring provided in an embodiment of this utility model.

[0027] Explanation of icon 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. Accommodation space; 40. Sealing ring; 41. Ring; 42. First ring; 43. Second ring; 44. Buckle; 441. First sub-buckle; 442. Second sub-buckle; 50. Positioning component. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the overall structure of the battery box provided in this embodiment of the utility model; Figure 2 This is a schematic diagram showing the fit between the box cover 20 and the sealing ring 40 provided in this embodiment of the utility model.

[0031] This utility model discloses a battery box, which includes a box body 10, a box cover 20, and a sealing ring 40: one end of the box body 10 forms an opening 11; the box cover 20 includes a first part 21 and a second part 22, the second part 22 is connected to the side of the first part 21 near the box body 10, the first part 21 covers the opening 11 and surrounds the box body 10 to form an 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 sandwiched between the inner side of the box body 10 and the second part 22.

[0032] For clarity, a preferred installation method of the battery box in this embodiment is described here: a box cover 20, a sealing ring 40, and a box body 10 are provided; the sealing ring 40 is fitted onto the second part 22 area of ​​the box cover 20; the box cover 20 is fastened to the opening 11 of the box body 10, such that the second part 22 is embedded in the receiving space 30, and the sealing ring 40 is sandwiched between the second part 22 and the inner side of the box body 10. When it is necessary to open the box for maintenance, only the box cover 20 and the sealing ring 40 need to be pulled out together, and after maintenance, they can be fastened back in the original way. It should be noted that the above implementation is only an application example of this embodiment and should not be used to limit the scope of protection of this application.

[0033] Compared with the prior art, on the one hand, the setting of the sealing ring 40 makes the battery box of this embodiment more convenient to disassemble and assemble. The installation process can be completed without waiting for the sealant to cure, and the impact of residual sealant on secondary sealing is not needed when disassembling. On the other hand, in the prior art, the box body 10 and the box cover 20 abut against each other in the fastening direction of the box cover 20. The fixation of the relative position of the box cover 20 and the box body 10 requires additional fasteners. In this embodiment, the second part 22 can be fastened after being inserted into the accommodating space 30. If necessary, the fasteners can be eliminated to achieve a more simplified structure. Furthermore, in the prior art, the sealing surfaces of the casing 10 and the cover 20 are abutting surfaces. That is, the area of ​​the sealing surface is limited by the wall thickness of the casing 10. If the casing 10 is too thin, the sealing performance of the battery box will be affected. However, in this embodiment, the relative sealing surfaces of the casing 10 and the cover 20 are the sides. Specifically, the inner side of the casing 10 and the outer side of the second part 22 are sealed by the sealing ring 40. The area of ​​the sealing surface is independent of the wall thickness of the casing 10. Therefore, the casing 10 can be configured with a thinner wall thickness, which reduces the weight of the battery box and increases 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 a shape in which multiple sub-rings are protruded on a substrate; the sealing ring 40 can be annular in its natural state, or it can be a pre-set shape according to the shape of the second part 22.

[0035] In some embodiments of this application, the battery box further includes a positioning member 50. A first positioning hole 121 is provided 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 part 21.

[0036] The positioning element 50 ensures the relative shape of the box body 10 and the box cover 20. In particular, when the wall thickness of the box body 10 is reduced, the multiple positioning elements 50 evenly distributed around 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 be stably clamped with the sealing ring 40 with the second part 22, ensuring good sealing of the battery box.

[0037] For example, the housing 10 has a first positioning hole 121 and the first part 21 has a second positioning hole 211. The positioning member 50 is preferably a screw that is threaded into 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 housing 10 is pulled closer to the cover 20. The housing 10 and the cover 20 clamp the sealing ring 40, thereby optimizing the sealing effect of the battery box.

[0038] Please refer to the following: Figures 3 to 5 As shown, Figure 3 yes Figure 1 A magnified view of a portion of region A in the middle; Figure 4 It is along Figure 1 Schematic diagram of the cross section of the middle BB line; Figure 5 yes Figure 4 A magnified view of a portion of region C.

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

[0040] A smaller R1 results in less space redundancy when the battery pack is densely packed. However, an excessively small R1 can make it difficult for the sealing ring 40 to fit into the angle between the adjacent side plates 12. An R1 ≥ 5mm ensures a tight fit between the sealing ring 40 and the side plate 12, eliminating the need for additional molds to produce irregularly shaped sealing rings 40. Furthermore, it maintains the structural strength of the housing 10 even after the wall thickness is reduced, preventing cracking at the side edges. An L1 ≤ 2mm reduces the weight of the housing 10, increasing the weight ratio of components such as cells and circuit boards within the battery pack and improving its energy density.

[0041] In some embodiments of this application, the gap between the second part 22 and the inner side of the housing 10 is L2, and the maximum thickness of the sealing ring 40 in its natural state is L0, where L2 < L0.

[0042] The gap between the second part 22 and the inner side of the housing 10 is less than the maximum thickness of the sealing ring 40 in its natural state. That is, after the housing cover 20 and the housing 10 are assembled in place, the sealing ring 40 is interference-fitted with the housing 10 and the housing cover 20. The sealing ring 40 is compressed and deformed, spontaneously extending to fill any possible airtight gaps, while also increasing the cross-sectional area of ​​the sealing surface and enhancing the sealing effect. In addition, the interference-fit sealing ring 40 also increases the difficulty of removing the housing cover 20, and can maintain the relative positional relationship between the housing cover 20 and the housing 10 to a certain extent without the need for additional positioning parts 50.

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

[0044] On the one hand, by dividing the overall sealing ring 40 into a ring 41 and multiple sub-rings, compared with the uniformly sized overall sealing ring 40, the difficulty of inserting the sealing ring 40 is reduced, the pressure required for assembly is reduced, and the probability of deformation of the housing 10 is reduced. On the other hand, a clearance space is formed between adjacent sub-rings, so that when the sub-rings deform, the sealing ring 40 can extend to a larger sealing surface. Specifically, when the central area of ​​the overall sealing ring 40 is about to extend to both sides, it will be restricted by the areas on both sides and will be difficult to unfold due to the presence of internal stress. In this embodiment, the deformable area is divided into multiple sub-rings, the internal stress of the sealing ring 40 is reduced, and the deformation under the same pressure is greater, which can achieve a better sealing effect.

[0045] It is conceivable that, although the accompanying drawings of this embodiment only show two sub-circles, those skilled in the art can set up a first circle, a second circle, and continue to superimpose a third circle, a fourth circle, etc., without any creative effort, which also falls within the protection scope 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, where L3 < L2. The thickness of the first ring 42 is L4, and the thickness of the second ring 43 is L5, where L3 + L4 > L2 and L5 + L3 > L2.

[0047] The thickness of the loop 41 is less than the gap between the second part 22 and the inner side of the box 10. That is, without considering the deformation of the first ring 42 and the second ring 43, there is a gap between the loop 41 and the box 10. This ensures that the resistance is small during the deformation of the first ring 42 and the second ring 43 toward the clearance space, and the clearance space can play its role in releasing internal stress.

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

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

[0050] In some embodiments of this application, the second part 22 is provided with a slot 221; the sealing ring 40 includes a buckle 44 and a sleeve 41, the sleeve 41 is fitted onto the second part 22, and the buckle 44 is disposed on the inner surface of the sleeve 41 and embedded in the slot 221.

[0051] The cooperation between the slot 221 and the buckle 44 allows the sealing ring 40 to fit tightly against the second part 22. In the actual assembly process, you only need to hold the lid 20 and fasten it to the box body 10. There is no need to clamp the sealing ring 40, which reduces the assembly difficulty.

[0052] Please refer to the above as well. Figure 6 and Figure 7 As shown, Figure 6 This is a partial detail view of the box cover 20 provided in this embodiment of the utility model; Figure 7 This is a partial detail view of the sealing ring 40 provided in this embodiment of the utility model.

[0053] Furthermore, a cover space 222 is formed within the second part 22; the slot 221 includes a first slot 2211 and a second slot 2212, the second slot 2212 is interconnected with the first slot 2211, the first slot 2211 passes through the edge of the second part 22, and both the first slot 2211 and the second slot 2212 are 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 loop 41 through the first sub-buckle 441, the first sub-buckle 441 is embedded in the second slot 2212, and the second sub-buckle 442 is set 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 the slot 221 and the buckle 44. The first buckle 441 is embedded in the second slot 2212, and the second buckle 442 is set in the cover space 222. This makes it difficult for the buckle 44 to come out of the slot 221, ensuring the stable connection between the sealing ring 40 and the box cover 20.

[0055] In some embodiments of this application, the outer diameter of the first part 21 is larger than the outer diameter of the second part 22, and the sealing ring 40 abuts against the first part 21 on the side closest to the first part 21.

[0056] The outer diameter of the first part 21 is larger than the outer diameter of the second part 22. After the battery box is assembled, one side surface of the sealing ring 40 still abuts against the first part 21. That is, when the box cover 20 is fastened to the box body 10, the sealing ring 40 is pushed by the first part 21 in the fastening direction of the box cover 20, so as to prevent the sealing ring 40 from slipping away from the second part 22.

[0057] The outer diameter here should be understood as the outer contour intercept of the first part 21 and the second part 22, and it is not required that the cross-sections of the first part 21 and the second part 22 must be circular.

[0058] To address the shortcomings of existing battery box structures, such as difficult assembly and large wall thickness, this utility model also discloses a battery pack, which includes individual batteries and a battery box as described above, with the individual batteries disposed within the accommodating space 30.

[0059] Because the disclosed battery pack includes the battery box disclosed in the above embodiments, with individual batteries housed in the housing space 30 for housing the individual batteries, the battery pack of this embodiment also has the technical effects of the battery box of the above embodiments. Specifically, on the one hand, the battery pack does not require additional fasteners during assembly; simply placing the cover 20 on the housing 10 allows the second part 22 to be embedded in the housing space 30. The cover 20 and the housing 10 are clamped together with a sealing ring 40, which can fix the relative positions of the cover 20 and the housing 10 and ensure the sealing of the housing space 30, preventing electrolyte leakage or external gas and liquid from entering the battery box. On the other hand, the side of the sealing ring 40 away from the cover 20 abuts against the inner surface of the housing 10. Compared with the existing technical solution where the cover 20 and the housing 10 abut against each other in the fastening direction of the cover 20, the end face design of the housing 10 in this 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 indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0061] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0062] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0063] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the design concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A battery box characterized by, The battery box comprises: a box body, one end of which forms an opening; a box cover comprising a first part and a second part, the second part being connected to the first part near one side of the box body, the first part covering the opening and forming a containing space together with the box body, and the second part being embedded in the containing space; a sealing ring, which is sleeved on the second part and clamped between the inner side of the box body and the second part.

2. The battery pack of claim 1, wherein, 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 is connected to the first part through the first positioning hole.

3. The battery pack of claim 1, wherein, The box body comprises a plurality of side plates and a bottom plate, the side plates and the bottom plate form the box body, the opening is located at one end of the side plates away from the bottom plate, adjacent side plates are connected in an arc shape, the inner curvature radius of the arc is R1, and R1≥5mm; and / or The thickness of the side plates is L1, and L1≤2mm.

4. The battery pack of claim 1, wherein, The gap between the second part and the inner side of the box body is L2, the maximum thickness of the sealing ring in a natural state is L0, and L2 5. The battery pack of claim 4, wherein, The sealing ring comprises a sleeve and at least one sub-ring, the sleeve is sleeved on the second part, the sub-ring is sleeved on one side of the sleeve away from the second part, and an avoiding space is formed between adjacent sub-rings or between the sub-ring and the sleeve.

6. The battery pack of claim 5, wherein, At least two sub-rings comprise a first ring and a second ring, the thickness of the sleeve is L3, L3 7. The battery pack of claim 5, wherein, At least two sub-rings comprise a first ring and a second ring, the second ring is located on one side of the first ring away from the first part, the thickness of the first ring is L4, the thickness of the second ring is L5, and L5 8. The battery box according to any one of claims 1 to 7, characterized in that, A clamping groove is formed on the second part; The sealing ring comprises a buckle and a sleeve, the sleeve is sleeved on the second part, and the buckle is arranged on the inner surface of the sleeve and embedded in the clamping groove.

9. The battery pack of claim 8, wherein, A cover plate space is formed in the second part; The clamping groove comprises a first groove and a second groove, the second groove and the first groove are in communication with each other, the first groove penetrates the edge of the second part, the first groove and the second groove are in communication with the cover plate space, the width of the first groove is L6, and the width of the second groove is L7; The buckle comprises a first sub-buckle and a second sub-buckle, the second sub-buckle is connected to the sleeve through the first sub-buckle, the first sub-buckle is embedded in the second groove, the second sub-buckle is arranged in the cover plate space, the width of the first sub-buckle is L8, and the width of the second sub-buckle is L9; L6 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 one side of the sealing ring near the first part abuts against the first part.

11. A battery pack, characterized by The battery box comprises: The battery box of any one of claims 1-10; The monomer battery is arranged in the containing space.

Images