Battery pack

Abstract

The battery pack comprises a main shell, a waterproof cover, a battery cell assembly, an upper cover and a sealing ring, the main shell is provided with a cavity and a top opening communicated with the cavity, at least part of the waterproof cover is located in the cavity, the waterproof cover is in sealing fit with the main shell, a sealing space is formed between the waterproof cover and the main shell, and the battery cell assembly is contained in the sealing space; the upper cover is connected to at least one of the main shell and the waterproof cover, the waterproof cover is covered with the upper cover, the upper cover seals the top opening, and the sealing ring is arranged between the upper cover and the main shell to seal a gap between the upper cover and the main shell. The battery pack provided by the embodiment of the utility model has two seals, and when the sealing ring between the main shell and the upper cover fails, a sealing structure is also arranged between the waterproof cover and the main shell, so that water can be prevented from being in contact with the battery core assembly in the battery pack, and the waterproof performance of the battery pack is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and particularly to a battery pack. BACKGROUND

[0002] The battery pack of the two-wheeled vehicle includes a middle barrel, an upper cover, a bottom shell and a battery module, the middle barrel has a top opening and a bottom opening, the bottom shell is connected to the middle barrel and closes the bottom opening, the upper cover is connected to the middle barrel and closes the top opening, a cavity is formed between the upper cover, the middle barrel and the bottom shell, and the battery module is arranged in the cavity. There is usually a sealing ring between the upper cover and the middle barrel for sealing the gap between the upper cover and the middle barrel. The entire battery pack has only one sealing structure at the top. When the sealing ring between the upper cover and the middle barrel fails, external liquid can easily enter the cavity of the battery pack and contact the battery cell assembly, causing the battery cell assembly to short circuit and triggering a safety accident. CONTENT OF THE UTILITY MODEL

[0003] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0004] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0005] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0006] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0007] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0008] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0009] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0010] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0011] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0012] The battery pack provided by the embodiments of the present disclosure has two sealing structures at the top, which improves the waterproof performance of the battery pack and improves the safety of the battery pack.

[0013] The first connecting member comprises a first stud and a first cap connected to the first stud, the first stud is connected to the battery cell shell through the waterproof cover, and the first cap is limited to the waterproof cover.

[0014] The gel covers the first cap.

[0015] Optionally, the waterproof cover comprises a middle shell and a sealing matching edge arranged around the edge of the middle shell, the sealing matching edge is supported on the battery cell shell, the sealing matching edge extends to the inner wall of the main shell, and the sealing matching edge and the inner wall of the main shell are sealedly connected by the gel;

[0016] The middle shell is convex to one side of the upper cover, and an accommodation space is formed between the middle shell and the battery cell shell, and the accommodation space is used at least for arranging a BMS module of the battery pack.

[0017] Optionally, the main shell has a top end face surrounding the top opening;

[0018] The sealing ring comprises a first sealing ring piece and a second sealing ring piece, and the first sealing ring piece and the second sealing ring piece are connected vertically;

[0019] The upper cover has a sealing ring plate and a plug barrel, and the sealing ring plate is arranged around the plug barrel;

[0020] In the state that the upper cover is connected to the main shell, the plug barrel is inserted into the main shell, and the sealing ring plate is supported on the top end face;

[0021] The first sealing ring piece is located between the sealing ring plate and the top end face to close the gap between the sealing ring plate and the main shell, and the second sealing ring piece is located between the plug barrel and the inner wall of the main shell to close the gap between the plug barrel and the inner wall of the main shell.

[0022] Optionally, the battery pack comprises a second connecting member;

[0023] The second connecting member comprises a second stud and a second cap, and the second cap is connected to the second stud;

[0024] The second stud is threadedly connected to the plug barrel through the main shell and the second sealing ring piece, and the second cap is limited to the main shell.

[0025] Optionally, a convex ring is arranged on the side of the second sealing ring piece away from the plug barrel;

[0026] The convex ring and the inner wall of the main shell are in sealing contact.

[0027] Optionally, the waterproof cover comprises a middle shell and a sealing matching edge arranged around the edge of the middle shell,

[0028] The sealing ring comprises a third sealing ring piece connected to a side of the second sealing ring piece away from the first sealing ring piece;

[0029] The third sealing ring piece is sealingly pressed and fitted between the insertion cylinder and the sealing fitting edge to close the gap between the insertion cylinder and the sealing fitting edge.

[0030] Optionally, the third sealing ring piece is sealingly bonded to the sealing fitting edge by a colloid.

[0031] Optionally, the main shell comprises a middle barrel and a bottom shell;

[0032] The middle barrel has the top opening and a bottom opening communicating with the cavity;

[0033] The bottom shell is welded to the middle barrel and the bottom shell closes the bottom opening.

[0034] The battery pack provided by the present disclosure has two sealing structures. When the sealing ring between the main shell and the upper cover fails, there is still a sealing structure between the waterproof cover and the main shell, which can avoid water from contacting the battery cell assembly in the battery pack, and significantly improves the waterproof performance of the battery pack.

[0035] The technical solutions of the present disclosure will be described in further detail below with the aid of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0037] The present disclosure can be understood more clearly with the aid of the following detailed description in conjunction with the accompanying drawings, in which:

[0038] Figure 1 An appearance structure schematic diagram of a battery pack provided by an embodiment of the present disclosure is shown;

[0039] Figure 2 A cross-sectional view of a battery pack provided by an embodiment of the present disclosure is shown;

[0040] Figure 3 A middle A part enlarged view is shown; Figure 2 A middle B part enlarged view is shown;

[0041] Figure 4 An exploded view of a battery pack provided by an embodiment of the present disclosure is shown; Figure 2 A middle B part enlarged view is shown;

[0042] Figure 5 An exploded view of a battery pack provided by an embodiment of the present disclosure is shown;

[0043] Figure 6 A middle A part enlarged view is shown; Figure 5Enlarged view of the middle C part;

[0044] Figure 7 Show Figure 5 Enlarged view of the middle D part.

[0045] In the figure: 1, main shell; 11, cavity; 111, sealing space; 111a, containing space; 12, middle barrel; 121, top port; 122, top end face; 13, bottom shell; 131, bottom wall; 132, circumferential wall; 1321, annular main wall; 1322, first annular step; 1323, second annular step; 14, groove; 2, waterproof cover; 21, middle shell; 22, sealing fit edge; 3, electric core assembly; 31, electric core shell; 32, electric core; 4, upper cover; 41, sealing ring plate; 42, insertion cylinder; 5, sealing ring; 51, first sealing ring piece; 52, second sealing ring piece; 521, convex ring; 53, third sealing ring piece; 6, BMS module; 7, second connecting piece; 71, second stud; 72, second cap body.

[0046] It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0048] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.

[0049] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] Figure 1 Show the structural schematic diagram of the battery pack provided by the embodiment of the present disclosure. Figure 2A cross-sectional view of the battery pack is shown. Figure 3 A cross-sectional view of the battery pack is shown. Figure 2 An enlarged view of the middle A part. The battery pack includes a battery cell assembly 3, a main shell 1, and an upper cover 4. The main shell 1 has a cavity 11 and a top opening 121 communicating with the cavity 11. The battery cell assembly 3 is arranged in the cavity 11. The upper cover 4 is connected to the main shell 1. The upper cover 4 covers the top opening 121. A sealing ring 5 is arranged between the upper cover 4 and the main shell 1 to seal the gap between the upper cover 4 and the main shell 1, so as to prevent external liquid from entering the cavity 11 and contacting the battery cell assembly 3 in the cavity 11 through the gap between the upper cover 4 and the main shell 1.

[0051] The sealing ring 5 arranged between the upper cover 4 and the main shell 1 forms a first sealing. The battery pack further has a second sealing structure arranged at the top of the battery pack. When the first sealing fails, the second sealing structure can still effectively prevent water from entering the inside of the battery pack from the top of the battery pack.

[0052] Figure 5 An exploded view of the battery pack is shown. Figure 6 An exploded view of the battery pack is shown. Figure 5 An enlarged view of the middle C part. The battery pack includes a waterproof cover 2, a battery cell assembly 3, and an upper cover 4. The waterproof cover 2 is at least partially located in the cavity 11. The waterproof cover 2 is sealingly connected to the main shell 1. A sealing space 111 is formed between the waterproof cover 2 and the main shell 1. The battery cell assembly 3 is contained in the sealing space 111. The upper cover 4 is connected to the main shell 1. The upper cover 4 covers the waterproof cover 2. The upper cover 4 covers the top opening 121. The sealing ring 5 is arranged between the upper cover 4 and the main shell 1 to seal the gap between the upper cover 4 and the main shell 1.

[0053] The battery pack has two sealing structures. The sealing ring 5 arranged between the upper cover 4 and the main shell 1 forms a first sealing. When the sealing ring 5 arranged between the main shell 1 and the upper cover 4 fails, a second sealing structure is formed between the waterproof cover 2 and the main shell 1. This can prevent water from entering the sealing space 111 and contacting the battery cell assembly 3 inside, thereby significantly improving the waterproof performance of the battery pack.

[0054] In some possible embodiments, the battery cell assembly 3 has a battery cell shell 31 and a battery cell 32 arranged in the battery cell shell 31. The battery cell 32 can be a plurality of cylindrical batteries. The waterproof cover 2 is supported on the battery cell shell 31. The peripheral side edge of the waterproof cover 2 extends to the inner wall of the main shell 1. The waterproof cover and the inner wall of the main shell 1 are sealingly connected by a colloid. The waterproof cover is stably supported on the insulating battery cell shell 31 outside the battery cell assembly 3. The gap between the peripheral side edge 132 of the waterproof cover 2 and the inner wall of the main shell 1 is sealed by a colloid. The sealing space 111 is formed between the waterproof cover 2 and the main shell 1.

[0055] In some possible embodiments, the battery pack comprises a first connector (not shown) comprising a first stud and a first cap body connecting the first stud, the first stud is connected to the cell shell 31 through the waterproof cover 2, and the first cap body is limited to the waterproof cover 2, and the adhesive covers the first cap body.

[0056] The waterproof cover 2 is supported on the cell shell 31 and is also fixed on the cell shell 31 through the first connector, the waterproof cover 2 is stably assembled on the cell shell 31 and cannot be easily shaken, the adhesive between the waterproof cover 2 and the inner wall of the main shell 1 is prevented from being cracked under stress, and the durability and reliability of the battery pack are improved. Threaded holes can be provided on the cell shell 31 outside the cell assembly 3, through holes corresponding to the threaded holes are provided on the waterproof cover 2, the first stud of the first connector can penetrate the through holes and be threadedly connected to the threaded holes on the cell shell 31. The first cap body of the first connector can cover the through holes. The adhesive can cover the waterproof cover 2 and the first cap body of the first connector, thereby further sealing the through holes and determining the sealing effect of the waterproof cover 2.

[0057] In some possible embodiments, as shown in Figure 3 The waterproof cover 2 comprises a middle shell 21 and a sealing matching edge 22 arranged around the edge of the middle shell 21, the sealing matching edge 22 is supported on the cell shell 31, the sealing matching edge 22 extends to the inner wall of the main shell 1, and the sealing matching edge 22 and the inner wall of the main shell 1 are sealingly connected through the adhesive, the middle shell 21 is gap-fitted with the cell shell 31, the middle shell 21 is outwardly convex to one side of the upper cover 4, and a containing space 111a is formed between the middle shell 21 and the cell shell 31, which is used at least for arranging the BMS module 6 of the battery pack. The BMS module 6 is also substantially arranged in the sealed space 111 and is also sealingly protected by the two-layer sealing structure.

[0058] In some possible embodiments, as shown in Figure 3 and Figure 6 The sealing ring 5 can comprise a first sealing ring piece 51 and a second sealing ring piece 52, the first sealing ring piece 51 and the second sealing ring piece 52 are vertically connected, the sealing ring 5 is not a planar structure piece in the form of a ring, but a three-dimensional structure, thereby increasing the contact area between the sealing ring 5 and the upper cover 4 and the main shell 1 and improving the sealing effect.

[0059] The main shell 1 has a top end face 122 surrounding the top opening 121, the upper cover 4 has a sealing ring plate 41 covering the top end face 122 of the main shell 1, and the first sealing ring piece 51 can be arranged between the top end face 122 and the sealing ring plate 41 to close the gap between the top end face 122 and the sealing ring plate 41.

[0060] The main shell 1 has a plug 42, and a sealing ring plate 41 extends along the circumference of the plug 42. In the state that the upper cover 4 is connected to the main shell 1, the plug 42 is inserted into the main shell 1, the outer wall of the plug 42 is in contact with the inner wall of the main shell 1, and the second sealing ring plate 52 is located between the plug 42 and the inner wall of the main shell 1 to seal the gap between the plug 42 and the inner wall of the main shell 1. Even if the first sealing ring plate 51 fails, the second sealing ring plate 52 can still provide good sealing effect.

[0061] In some possible embodiments, as shown in Figure 3 and Figure 6 The battery pack includes a second connecting piece 7, the second connecting piece 7 includes a second stud 71 and a second cap 72, the second cap 72 is connected to the second stud 71, the second stud 71 is screwed to the plug 42 through the main shell 1 and the second sealing ring plate 52, and the second cap 72 is limited on the main shell 1.

[0062] The plug 42 can be provided with a threaded hole, and the second stud 71 is screwed to the threaded hole on the plug 42. During the screwing of the second connecting piece 7, the plug 42 can be sequentially pressed against the inner wall of the main shell 1 to compress the second sealing ring plate 52, so that the second sealing ring plate 52 can effectively seal the gap between the plug 42 and the main shell 1.

[0063] In some possible embodiments, as shown in Figure 3 and Figure 6 The side of the second sealing ring plate 52 away from the plug 42 is provided with a convex ring 521, the convex ring 521 is in sealing contact with the inner wall of the main shell 1, the convex ring 521 is a closed ring and protrudes from the surface of the second sealing ring plate 52. Under the extrusion of the main shell 1 and the plug 42, the convex ring 521 is in elastic deformation, which can effectively increase the sealing effect.

[0064] In some possible embodiments, as shown in Figure 3 and Figure 6 The waterproof cover 2 includes a middle shell 21 and a sealing fitting edge 22 arranged along the circumference of the edge of the middle shell 21. The sealing ring 5 includes a third sealing ring plate 53 connected to the side of the second sealing ring plate 52 away from the first sealing ring plate 51. The third sealing ring plate 53 is sealingly and tightly fitted between the plug 42 and the sealing fitting edge 22 to seal the gap between the plug 42 and the sealing fitting edge 22.

[0065] The third sealing ring plate 53 is located at the bottom annular end face of the plug 42 and the upper surface of the sealing fitting edge 22. The third sealing ring plate 53 can be sealed and bonded to the sealing fitting edge 22 by glue. The third sealing ring plate 53 can be bonded to the sealing fitting edge 22 by the glue. The glue not only has the effect of connecting and fixing the ring, but also has the effect of sealing.

[0066] In the process of assembling the waterproof cover 2 and the upper cover 4, the waterproof cover 2 can be first placed in the cavity 11, so that the sealing fitting edge 22 of the waterproof cover 2 is supported on the battery cell shell 31. The sealing fitting edge 22 is fixed to the battery cell shell 31 through the first connecting piece. Then, glue is applied on the sealing fitting edge 22 to seal the gap between the inner wall of the main shell 1 and the sealing fitting edge 22, and the glue covers the first cap of the first connecting piece. Then, the sealing ring 5 is installed, so that the third sealing ring piece 53 of the sealing ring 5 is bonded to the glue on the sealing fitting edge 22. Next, the upper cover 4 is installed, so that the sealing ring plate 41 of the upper cover 4 and the top end surface 122 of the main shell 1 extrude and fix the first sealing ring piece 51. Finally, the second connecting piece 7 is connected to the plug barrel 42 through the main shell 1 and the second sealing ring piece 52, so that the plug barrel 42 and the main shell 1 are tightly fixed to the second sealing ring piece 52.

[0067] In some possible embodiments, as shown in Figure 1 , Figure 2 , Figure 5 and Figure 7 , the main shell 1 includes a middle barrel 12 and a bottom shell 13. The middle barrel 12 has a top opening 121 and a bottom opening communicating with the cavity 11. The bottom shell 13 is welded to the middle barrel 12 and seals the bottom opening. The welding can effectively seal the gap between the middle barrel 12 and the bottom shell 13, avoiding the situation that water easily enters the bottom of the battery pack.

[0068] In some possible embodiments, as shown in Figure 1 , Figure 4 and Figure 7 , the bottom shell 13 has a bottom wall 131 and a peripheral side wall 132. The peripheral side wall 132 has an annular main wall 1321, a first annular step 1322 and a second annular step 1323. The annular main wall 1321 is directly connected to the bottom wall 131. The first annular step 1322 is arranged on the end surface of the annular main wall 1321. The second annular step 1323 is arranged on the end surface of the first annular step 1322. In the connected state of the bottom shell 13 and the middle barrel 12, the middle barrel 12 is sleeved on the first annular step 1322 and abuts against the second annular step 1323. A groove 14 is formed between the middle barrel 12 and the annular main wall 1321, which can be used to fill the welding material, facilitating the sealing welding of the bottom shell 13 and the middle barrel 12.

[0069] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although a plurality of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery pack, characterized by, The application relates to a waterproof battery pack, which comprises a main shell, a waterproof cover, an electric core assembly, an upper cover and a sealing ring. The main shell has a cavity and a top opening communicating with the cavity. The waterproof cover is at least partially located in the cavity and is in sealing cooperation with the main shell, and a sealing space is formed between the waterproof cover and the main shell. The electric core assembly is accommodated in the sealing space. The upper cover is connected to the main shell, covers the waterproof cover and seals the top opening. The sealing ring is arranged between the upper cover and the main shell to seal the gap between the upper cover and the main shell.

2. The battery pack of claim 1, wherein, The electric core assembly has an electric core shell and an electric core arranged in the electric core shell. The waterproof cover is supported on the electric core shell, the peripheral edge of the waterproof cover extends to the inner wall of the main shell, and the waterproof cover and the inner wall of the main shell are in sealing connection through glue.

3. The battery pack of claim 2, wherein, The application further relates to a first connecting member. The first connecting member comprises a first stud and a first cap body connected to the first stud. The first stud is connected to the electric core shell through the waterproof cover, and the first cap body is limited to the waterproof cover.

4. The battery pack of claim 2, wherein, The glue covers the first cap body. The waterproof cover comprises a middle shell and a sealing cooperation edge arranged around the peripheral edge of the middle shell.

5. The battery pack of claim 1, wherein, The middle shell is convex to one side of the upper cover, and a containing space is formed between the middle shell and the electric core shell. The containing space is used for arranging a BMS module of a battery pack. The main shell has a top end face surrounding the top opening. The sealing ring comprises a first sealing ring piece and a second sealing ring piece. The first sealing ring piece and the second sealing ring piece are vertically connected. The upper cover has a sealing ring plate and a plug barrel. In the state that the upper cover is connected to the main shell, the plug barrel is inserted into the main shell, and the sealing ring plate is supported on the top end face. The first sealing ring piece is located between the sealing ring plate and the top end face to seal the gap between the sealing ring plate and the main shell. The second sealing ring piece is located between the plug barrel and the inner wall of the main shell to seal the gap between the plug barrel and the inner wall of the main shell.

6. The battery pack of claim 5, wherein, The application further relates to a second connecting member. The second connecting member comprises a second stud and a second cap body. The second cap body is connected to the second stud. The second stud is threadedly connected to the plug barrel through the main shell and the second sealing ring piece. The second cap body is limited to the main shell.

7. The battery pack of claim 5, wherein, The side, away from the plug barrel, of the second sealing ring piece is provided with a convex ring. The convex ring is in sealing contact with the inner wall of the main shell. The waterproof cover comprises a middle shell and a sealing cooperation edge arranged around the peripheral edge of the middle shell.

8. The battery pack of claim 5, wherein, The sealing ring comprises a third sealing ring piece. The third sealing ring piece is connected to the side, away from the first sealing ring piece, of the second sealing ring piece. The third sealing ring piece is in sealing and pressing cooperation between the plug barrel and the sealing cooperation edge to seal the gap between the plug barrel and the sealing cooperation edge. The third sealing ring piece is in sealing contact with the plug barrel and the sealing cooperation edge through glue. ​ ​ 9. The battery pack of claim 8, wherein, ​ The body is sealed to the sealing mating edge by adhesive.

10. The battery pack of any one of claims 1-9, wherein, The main shell includes a middle shell and a bottom shell; The middle shell has the top opening and a bottom opening communicating with the cavity; The bottom shell is welded to the middle shell and the bottom shell closes the bottom opening.

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