Plug anti-loosening structure and battery pack

Abstract

The utility model provides a plug anti-loosening structure, which is used for being mounted inside a battery pack and connected with a cooling system of the battery pack, and comprises a fixed joint, a quick plug and an anti-loosening piece, the fixed joint is fixedly arranged on the shell wall of the battery pack; one end of the fixed joint extends out of the battery pack and is connected with an external pipeline, and the other end extends into the battery pack; the quick plug is provided with a first inserting part and a second inserting part, the first inserting part is connected with the extending end of the fixed joint in an inserting manner, and the second inserting part is connected with a liquid conveying pipeline of the cooling system in an inserting manner; the anti-loosening piece has a loosening state and an abutting state, and when the anti-loosening piece is in the abutting state, the anti-loosening piece abuts against the quick plug in the first direction and is used for limiting the first inserting part to the fixed connector. The utility model further provides a battery pack with the plug anti-loosening structure. According to the utility model, liquid leakage of the battery pack can be completely avoided, sealant does not need to be coated, the assembly efficiency of the battery pack is improved, the assembly cost is saved, and subsequent maintenance operation is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery packs, and more specifically, relates to a plug anti-loosening structure and a battery pack. Background Art

[0002] The battery pack generates heat during use. In order to improve the service life and safety of the battery pack, a liquid cooling system is usually required to cool the battery cells in the battery pack.

[0003] The liquid cooling system includes a liquid cooling plate and a liquid infusion pipeline, which is connected to an external pipeline through a plug structure. The plug structure generally includes a male plug and a female plug that plug into each other. Since the liquid infusion pipeline and the plug assembly need to transport coolant, if the male plug and the female plug are not plugged in tightly, become loose or detached, leakage will occur. In addition, the battery pack is completely closed inside, making it difficult to observe whether there is leakage. A large amount of coolant leakage will affect the cooling of the battery cell.

[0004] In the prior art, in order to prevent the male plug and the female plug from loosening or disengaging, sealant is applied at the connection between the male plug and the female plug. However, the application of the sealant requires waiting for the sealant to solidify into a solid state before subsequent assembly operations can be performed, resulting in low assembly efficiency and high assembly costs for the battery pack. Moreover, after the sealant is applied, the plug structure cannot be disassembled, which is inconvenient for subsequent maintenance operations. Utility Model Content

[0005] The utility model aims to provide a plug anti-loosening structure and a battery pack, aiming to prevent the plug structure from loosening or detaching, and to improve the overall assembly efficiency of the battery pack.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a plug anti-loosening structure, which is used to be installed inside a battery pack and connected to a cooling system of the battery pack, and the plug anti-loosening structure includes:

[0007] A fixed joint, fixedly arranged on the outer shell wall of the battery pack; one end of the fixed joint extends out of the battery pack for connecting to an external pipeline, and the other end of the fixed joint extends into the battery pack;

[0008] A quick plug having a first plug-in portion and a second plug-in portion, wherein the first plug-in portion is plugged into the insertion end of the fixed joint, and the second plug-in portion is plugged into the infusion pipeline of the cooling system; a plug-in direction of the first plug-in portion and the fixed joint is defined as a first direction; and

[0009] The anti-loosening member has a relaxed state and a pressed state. In the pressed state, the anti-loosening member is fixed inside the battery pack, and the anti-loosening member is in contact with the quick plug in the first direction, so as to limit the first plug-in portion on the fixed joint. In the relaxed state, the anti-loosening member is away from the quick plug, and the first plug-in portion and the fixed joint are detachable.

[0010] In a possible implementation manner, an elastic buffer pad is provided on the surface of the anti-loosening member, and in the abutting state, the anti-loosening member abuts against the quick plug through the elastic buffer pad.

[0011] In some embodiments, the anti-loosening component is detachably provided on the outer shell wall of the battery pack, and is also detachably provided on the safety component of the battery pack.

[0012] In some embodiments, the anti-loosening member includes:

[0013] A first fixing plate, which is in contact with and connected to a shell wall of the battery pack;

[0014] A second fixing plate connected to the first fixing plate and fitted and connected to the safety assembly; and

[0015] A limiting ear is formed on the outer peripheral edge of the second fixing plate; in the first direction, the limiting ear is located on one side of the quick plug; and the elastic buffer pad is provided on the surface of the limiting ear.

[0016] In some embodiments, the first fixing plate and the second fixing plate are arranged vertically.

[0017] In a possible implementation, the first plug-in portion is sleeved on the fixed joint, and a sealing ring is provided inside the first plug-in portion, and the sealing ring is interference-fitted with the fixed joint.

[0018] In some embodiments, a limiting ring groove is provided on the outer peripheral wall of the fixed joint, and a clamping block is provided on the inner wall of the first plug-in portion; the clamping block is clamped in the limiting ring groove.

[0019] In some embodiments, in the first direction, the sealing ring is located between the second plug-in portion and the clamping block, and the thickness of the sealing ring is greater than the thickness of the clamping block.

[0020] In a possible implementation, the first plug-in portion and the second plug-in portion are vertically arranged; and the second plug-in portion is inserted into the infusion pipeline of the cooling system.

[0021] The beneficial effects of the plug anti-loosening structure provided by the utility model are as follows: in the plug anti-loosening structure of the utility model, the fixed joint is used to connect the external pipeline, the quick plug is used to connect the infusion pipeline of the battery pack cooling system, and the quick plug is plugged into the fixed joint to realize the connection between the infusion pipeline and the external pipeline; in addition, an anti-loosening member is arranged inside the battery pack, and when in the abutting state, the anti-loosening member and the quick plug are abutted in the first direction, and the anti-loosening member can limit the quick plug from moving in the direction away from the fixed joint, so as to avoid the quick plug from loosening or detaching from the fixed joint, thereby preventing the coolant from leaking; in the relaxed state, the anti-loosening member is away from the quick plug, and the anti-loosening member no longer limits the quick plug, so that the first plug-in portion and the fixed joint are detachable, which is convenient for subsequent maintenance.

[0022] Compared with the prior art, the plug anti-loosening structure provided by the utility model does not require the application of sealant, thereby improving the assembly efficiency of the battery pack and saving assembly costs. Moreover, the quick plug and the fixed joint are detachable, which is convenient for subsequent maintenance operations.

[0023] The utility model also provides a battery pack, comprising the above-mentioned plug anti-loosening structure.

[0024] The battery pack provided by the utility model can completely prevent leakage of the battery pack due to the adoption of the above-mentioned plug anti-loosening structure, and can also improve the assembly efficiency of the battery pack, save costs, and facilitate subsequent maintenance operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of the plug anti-loosening structure provided by an embodiment of the utility model;

[0027] Figure 2 for Figure 1 A schematic diagram of the enlarged structure at the middle circle A;

[0028] Figure 3 A schematic diagram of the structure of the anti-loosening member of the plug anti-loosening structure provided by the embodiment of the utility model;

[0029] Figure 4 A schematic diagram of the exploded structure of the fixed joint and the quick plug provided in the embodiment of the utility model;

[0030] Figure 5 A schematic diagram of the exploded structure of a battery pack provided in an embodiment of the utility model.

[0031] In the figure:

[0032] 1. Fixed joint; 11. Limiting ring groove;

[0033] 2. Quick plug; 21. First plug-in portion; 211. Card-connecting block; 22. Second plug-in portion;

[0034] 3. Anti-loosening part; 31. Elastic buffer pad; 32. First fixing plate; 33. Second fixing plate; 34. Limiting ear;

[0035] 4. Sealing ring;

[0036] 5. Battery pack; 51. Liquid cooling plate; 52. Infusion pipeline; 53. Insurance component; 54. Battery cell; 55. Outer cover; 56. Back plate; 57. Bottom bracket. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] Please also read Figure 1 and Figure 2 The plug anti-loosening structure provided by the utility model is now described. The plug anti-loosening structure is used to be installed inside the battery pack 5 and connected to the cooling system of the battery pack 5. The plug anti-loosening structure includes a fixed joint 1, a quick plug 2 and an anti-loosening member 3. The fixed joint 1 is fixedly arranged on the outer shell wall of the battery pack 5; one end of the fixed joint 1 extends out of the battery pack 5 for connecting with the external pipeline, and the other end of the fixed joint 1 extends into the battery pack 5; the quick plug 2 has a first plug-in portion 21 and a second plug-in portion 22, the first plug-in portion 21 is plugged with the extended end of the fixed joint 1, and the second plug-in portion 22 is plugged with the infusion pipeline 52 of the cooling system; the plug-in direction of the first plug-in portion 21 and the fixed joint 1 is defined as the first direction; the anti-loosening member 3 is located inside the battery pack 5, and the anti-loosening member 3 has a relaxed state and a pressed state. In the pressed state, the anti-loosening member 3 is pressed against the quick plug 2 in the first direction, and the anti-loosening member 3 is used to limit the first plug-in portion 21 on the fixed joint 1; in the relaxed state, the anti-loosening member 3 is away from the quick plug 2, so that the first plug-in portion 21 and the fixed joint 1 are detachable.

[0039] See also Figure 5 In the prior art, the battery pack 5 includes an outer shell, a battery cell 54 and a cooling system located in the outer shell. The cooling system is used to cool the battery cell 54 to prevent the battery pack 5 from overheating. In order to facilitate the assembly of the battery pack 5, the outer shell is a split structure, including a back plate 56, a frame arranged around the back plate 56, and an outer cover 55 buckled on the frame and the back plate 56.

[0040] The cooling system generally includes a liquid cooling plate 51 and a liquid infusion line 52. The liquid cooling plate 51 is attached to the back plate 56. The liquid infusion line 52 has two parts, namely, a liquid inlet line and a liquid outlet line. The liquid inlet line and the liquid outlet line should be connected to the external line respectively to realize the circulation of the coolant in the liquid cooling plate 51. Therefore, both the liquid inlet line and the liquid outlet line are connected with the above-mentioned quick plug 2. In other words, two groups of fixed joints 1 are fixed at intervals on the outer shell wall of the battery pack 5, and each fixed joint 1 is correspondingly connected with a quick plug 2. The two quick plugs 2 are respectively connected to the liquid inlet end of the liquid inlet line and the liquid outlet end of the liquid outlet line; of course, the liquid outlet end of the liquid inlet line and the liquid inlet of the liquid cooling plate 51, and the liquid inlet end of the liquid outlet line and the liquid outlet of the liquid cooling plate 51 can also be connected through the above-mentioned quick plug 2 and the fixed joint 1 to achieve connection.

[0041] In the prior art, when the battery pack 5 is placed, the fixing joint 1 and the quick plug 2 are usually located below the battery cell 54 and the liquid cooling plate 51. Therefore, the fixing joint 1 is fixed to the bottom of the frame, and the bottom of the frame is defined as the bottom bracket 57. The fixing joint 1 can be fixed to the bottom bracket 57 by welding, or fixed to the bottom bracket 57 by two nuts facing each other. This embodiment does not limit the specific fixing method of the fixing joint 1, as long as the fixing joint 1 is fixed relative to the bottom bracket 57.

[0042] Since the fixing joint 1 is fixed on the base 57, it can be understood that the fixing joint 1 is extended along the up-down direction of the battery pack 5. Therefore, the first plug-in portion 21 and the fixing joint 1 are plugged in along the up-down direction, that is, the up-down direction of the battery pack 5 can be understood as the first direction of this embodiment.

[0043] It should be noted that when assembling the above-mentioned plug anti-loosening structure, the anti-loosening member 3 is in a relaxed state and away from the quick plug 2, that is, the quick plug 2 is first plugged with the fixed joint 1 and the infusion pipeline 52, and after the quick plug 2 is assembled, the anti-loosening member 3 is installed inside the battery pack 5 and the anti-loosening member 3 is in a tight state. In addition, when the battery pack 5 is maintained and the quick plug 2 is replaced, the anti-loosening member 3 is also in a relaxed state, that is, the anti-loosening member 3 is first removed, and the quick plug 2 is replaced after it loses its limit.

[0044] In the tight state, the anti-loosening member 3 abuts against the quick plug 2 in the first direction, and the anti-loosening member 3 is located above the quick plug 2. The anti-loosening member 3 can press the quick plug 2 downward to limit the quick plug 2 from moving upward and being misaligned or disengaged from the fixed joint 1. Since the quick plug 2 is always plugged into the fixed joint 1, the leakage problem can be completely eliminated.

[0045] It should be noted that the anti-loosening member 3 can be set as a group, and the anti-loosening member 3 can respectively abut against the two quick plugs 2 located directly above the base 57, or two anti-loosening members 3 can be set, and the two anti-loosening members 3 correspondingly abut against the two quick plugs 2 located directly above the base 57.

[0046] The utility model provides a plug anti-loosening structure, the fixed joint 1 is used to connect the external pipeline, the quick plug 2 is used to connect the infusion pipeline 52 of the cooling system of the battery pack 5, and the quick plug 2 is plugged into the fixed joint 1 to realize the connection between the infusion pipeline 52 and the external pipeline; in addition, an anti-loosening member 3 is arranged inside the battery pack 5, and when in the abutting state, the anti-loosening member 3 and the quick plug 2 are abutted in the first direction, and the anti-loosening member 3 can limit the quick plug 2 from moving in the direction away from the fixed joint 1, so as to prevent the quick plug 2 from loosening or detaching from the fixed joint 1, thereby preventing the coolant from leaking; in the relaxed state, the anti-loosening member 3 is away from the quick plug 2, and the anti-loosening member 3 no longer limits the quick plug 2, so that the first plug-in portion 21 and the fixed joint 1 are detachable, which is convenient for subsequent maintenance.

[0047] Compared with the prior art, the present embodiment adds an anti-loosening part 3, which is used to limit the displacement of the quick plug 2. There is no need to apply sealant, which improves the assembly efficiency of the battery pack 5 and saves assembly costs. Moreover, during subsequent maintenance operations on the battery pack 5, the quick plug 2 and the fixed connector 1 can also be disassembled and assembled, which improves the convenience of maintenance operations.

[0048] In some embodiments, the anti-loosening member 3 can be used as follows: Figure 2 and Figure 3 The structure shown, see Figure 2 and Figure 3 An elastic buffer pad 31 is provided on the surface of the anti-loosening member 3 , and the anti-loosening member 3 abuts against the quick plug 2 through the elastic buffer pad 31 .

[0049] The quick plug 2 is generally made of plastic material with high hardness. In addition, the battery pack 5 is provided with other components such as a safety assembly 53 and a copper busbar below the battery cell 54. Therefore, the space below the battery cell 54 is small, which may cause installation errors of the anti-loosening member 3. Since the elastic buffer pad 31 can be elastically deformed, the elastic buffer pad 31 can be added to compensate for the above-mentioned installation errors to ensure that the quick plug 2 is always in contact with the quick plug 2, and hard friction on the outer surface of the quick plug 2 can also be avoided.

[0050] In some embodiments, the anti-loosening member 3 can be used as follows: Figure 1 and Figure 2 The structure shown, see Figure 1 and Figure 2 The anti-loosening member 3 can be detachably arranged on the outer shell wall of the battery pack 5, and can also be detachably arranged on the insurance component 53 of the battery pack 5.

[0051] In the prior art, a fuse assembly 53 is further provided inside the battery pack 5 below the battery cell 54. The fuse assembly 53 is electrically connected to the battery cell 54. In order to reduce the number of electrical connections and optimize the layout of the two infusion lines 52 and the fuse assembly 53, the fuse assembly 53 is generally located between the two infusion lines 52.

[0052] The anti-loosening member 3 is detachably arranged on the outer shell wall of the battery pack 5 and the safety assembly 53, so that the anti-loosening member 3 can be switched between the loose state and the tight state. Moreover, the anti-loosening member 3 can be limited at two positions, which improves the fixing strength of the anti-loosening member 3 and prevents the anti-loosening member 3 from loosening, thereby ensuring that the anti-loosening member 3 has stable tightness in the tight state.

[0053] See also Figure 3 On the basis of the above embodiment, the anti-loosening member 3 includes a first fixing plate 32, a second fixing plate 33 and a stop ear 34. The first fixing plate 32 is fitted and connected to the outer shell wall of the battery pack 5; the second fixing plate 33 is connected to the first fixing plate 32 and is fitted and connected to the insurance component 53; the stop ear 34 is formed on the outer peripheral edge of the second fixing plate 33; in the first direction, the stop ear 34 is located on one side of the quick plug 2; and an elastic buffer pad 31 is provided on the surface of the stop ear 34.

[0054] Specifically, the first fixing plate 32 is connected to the outer shell wall of the battery pack 5 through threaded fasteners, and the second fixing plate 33 is connected to the insurance assembly 53 through threaded fasteners.

[0055] The anti-loosening member 3 includes a first fixing plate 32, a second fixing plate 33 and a limiting ear 34, that is, the anti-loosening member 3 is a bent plate-like structure, so that the structure of the anti-loosening member 3 is simple and easy to manufacture, and the anti-loosening member 3 occupies a small space and can be limited on the safety component 53, and is easy to install.

[0056] It should be noted that two groups of limiting ears 34 are provided on the outer edge of the second fixing plate 33 , and the two groups of limiting ears 34 are respectively in contact with the two quick plugs 2 .

[0057] Preferably, see Figure 3 The first fixing plate 32 and the second fixing plate 33 are arranged vertically.

[0058] Since the first fixing plate 32 is fixed to the outer shell wall of the battery pack 5, and the second fixing plate 33 is fixed to the insurance assembly 53, the first fixing plate 32 and the second fixing plate 33 are vertically arranged, so that the anti-loosening member 3 can be fixed in two directions, further improving its fixing strength.

[0059] It should be noted that the shell wall of the battery pack 5 refers to the back plate 56 of the shell, and the first fixing plate 32 is fixed on the back plate 56, that is, one of the fixing directions of the anti-loosening member 3 is the front-back direction of the battery pack 5. The insurance component 53 generally has an insulating plate perpendicular to the up-down direction, and the second fixing plate 33 is fixed on the insulating plate, that is, the other fixing direction of the anti-loosening member 3 is the up-down direction of the battery pack 5.

[0060] In order to reduce the installation error of the anti-loosening member 3, the fixing hole on the first fixing plate 32 is a waist-shaped hole.

[0061] In some embodiments, the quick plug 2 and the fixed connector 1 may be connected by Figure 4 The structure shown, see Figure 4 The first plug-in portion 21 is sleeved on the fixed joint 1, and a sealing ring 4 is provided inside the first plug-in portion 21, and the sealing ring 4 is interference-fitted with the fixed joint 1. The sealing ring 4 seals the quick plug 2 and the fixed joint 1 to prevent the coolant from leaking from the plug-in portion of the quick plug 2 and the fixed joint 1.

[0062] In some embodiments, the quick plug 2 and the fixed connector 1 may also be connected by Figure 4 The structure shown, see Figure 4 A limiting ring groove 11 is provided on the outer peripheral wall of the fixed joint 1 , and a clamping block 211 is provided on the inner wall of the first plug-in portion 21 ; the clamping block 211 is clamped in the limiting ring groove 11 .

[0063] The quick plug 2 is quickly connected with the limiting ring groove 11 through the clamping block 211. Specifically, when assembling the quick plug 2 and the fixed joint 1, as long as the first plug-in portion 21 is sleeved on the fixed joint 1 and the quick plug 2 is pushed forcefully in the direction of the fixed joint 1, the clamping block 211 can be clamped in the limiting ring groove 11 to achieve quick connection.

[0064] It should be noted that, in order to reduce friction, the clamping block 211 is not an annular structure, but two symmetrically distributed strip blocks. In addition, the end surface of the clamping block 211 facing the fixed joint 1 is a guiding inclined surface.

[0065] See also Figure 4 On the basis of the above embodiment, in the first direction, the sealing ring 4 is located between the second plug-in portion 22 and the clamping block 211 , and the thickness of the sealing ring 4 is greater than the thickness of the clamping block 211 .

[0066] In the first direction, if the direction in which the first plug-in portion 21 is pressed against the fixed joint 1 is limited to be forward, then the sealing ring 4 is located behind the clamping block 211, which facilitates the quick plugging operation of the quick plug 2, and the sealing ring 4 can completely block the coolant to prevent the coolant from flowing to the joint between the clamping block 211 and the limiting ring groove 11 and causing leakage.

[0067] In addition, the thickness of the sealing ring 4 is made greater than that of the clamping block 211. Even when the first plug-in portion 21 is not plugged in place (i.e., the clamping block 211 is not limited in the limiting ring groove 11, and the clamping block 211 is separated from the limiting ring groove 11 in the negative direction of the first direction), the quick plug 2 is slightly loose or slightly misaligned. Since the quick plug 2 is limited by the anti-loosening member 3, the quick plug 2 will not be completely separated from the fixed joint 1. Moreover, the thickness of the sealing ring 4 is large (i.e., the sealing stroke of the sealing ring 4 is large), and the sealing ring 4 can ensure that a part of the portion is interference fit with the fixed joint 1, thereby completely avoiding leakage of coolant.

[0068] In some embodiments, the quick plug 2 can be used as follows Figure 4 The structure shown, see Figure 4 The first plug-in portion 21 and the second plug-in portion 22 are vertically arranged; the second plug-in portion 22 is inserted into the infusion pipeline 52 of the cooling system.

[0069] Since the infusion pipeline 52 is located below the liquid cooling plate 51 and the battery cell 54, in order to optimize the layout of the infusion pipeline 52, the infusion pipeline 52 is generally extended and distributed along the left-right direction of the battery pack 5, and the fixed joint 1 is extended and distributed along the up-down direction of the battery pack 5. In order to adapt the fixed position of the infusion pipeline 52 and the fixed joint 1, and to facilitate the manufacture of the quick plug 2, the first plug-in portion 21 and the second plug-in portion 22 are vertically arranged, the first plug-in portion 21 is plugged with the fixed joint 1 along the up-down direction, and the second plug-in portion 22 is plugged with the infusion pipeline 52 along the left-right direction.

[0070] See also Figure 5 Based on the same inventive concept, an embodiment of the present application also provides a battery pack 5, including the above-mentioned plug anti-loosening structure.

[0071] The battery pack 5 includes an outer shell, and a battery cell 54, a fuse assembly 53, and a cooling system located inside the outer shell. The cooling system is used to cool the battery cell 54 to prevent the battery pack 5 from overheating. In order to facilitate the assembly of the battery pack 5, the outer shell is a split structure, including a back plate 56, a frame arranged around the back plate 56, and an outer cover 55 buckled on the frame and the back plate 56.

[0072] The cooling system generally includes a liquid cooling plate 51 and a liquid infusion pipeline 52. The liquid cooling plate 51 is attached to the back plate 56. The liquid infusion pipeline 52 has two parts, namely, a liquid inlet pipeline and a liquid outlet pipeline, which are respectively connected to external pipelines to realize the circulation of the coolant in the liquid cooling plate 51. Therefore, both the liquid inlet pipeline and the liquid outlet pipeline are connected with the above-mentioned quick plug 2.

[0073] The insurance component 53 is electrically connected to the battery core 54 . In order to reduce the number of electrical connection lines and optimize the layout of the two infusion pipelines 52 and the insurance component 53 , the insurance component 53 is generally located between the two infusion pipelines 52 .

[0074] In the prior art, when the battery pack 5 is placed in use, the fixing joint 1 and the quick plug 2 are usually located below the battery cell 54 and the liquid cooling plate 51 . Therefore, the fixing joint 1 is fixed to the bottom of the frame, and the bottom of the frame is defined as the bottom support 57 here.

[0075] The battery pack 5 provided by the present invention can completely prevent leakage of the battery pack 5 due to the adoption of the above-mentioned plug anti-loosening structure, and can also improve the assembly efficiency of the battery pack 5, save costs, and facilitate subsequent maintenance operations.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A plug anti-loosening structure, used for being installed inside a battery pack (5) and connected to a cooling system of the battery pack (5), characterized in that: The plug anti-loosening structure comprises: A fixed joint (1) is fixedly arranged on the outer shell wall of the battery pack (5); one end of the fixed joint (1) extends out of the battery pack (5) for connection with an external pipeline, and the other end of the fixed joint (1) extends into the battery pack (5); The quick plug (2) comprises a first plug-in portion (21) and a second plug-in portion (22), wherein the first plug-in portion (21) is plugged into the insertion end of the fixed joint (1), and the second plug-in portion (22) is plugged into the infusion pipeline (52) of the cooling system; a plug-in direction of the first plug-in portion (21) and the fixed joint (1) is defined as a first direction; and An anti-loosening member (3); the anti-loosening member (3) has a relaxed state and a pressed state. In the pressed state, the anti-loosening member (3) is fixed inside the battery pack (5), and the anti-loosening member (3) is pressed against the quick plug (2) in the first direction, so as to limit the first plug-in portion (21) on the fixed joint (1); in the relaxed state, the anti-loosening member (3) is away from the quick plug (2), and the first plug-in portion (21) and the fixed joint (1) are detachable.

2. The plug anti-loosening structure according to claim 1, characterized in that: An elastic buffer pad (31) is provided on the surface of the anti-loosening member (3); in the abutting state, the anti-loosening member (3) abuts against the quick plug (2) via the elastic buffer pad (31).

3. The plug anti-loosening structure according to claim 2, characterized in that: The anti-loosening component (3) is detachably arranged on the outer shell wall of the battery pack (5), and can also be detachably arranged on the safety component (53) of the battery pack (5).

4. The plug anti-loosening structure according to claim 3, characterized in that: The anti-loosening member (3) comprises: A first fixing plate (32) is fitted and connected to a shell wall of the battery pack (5); A second fixing plate (33) connected to the first fixing plate (32) and fitted and connected to the safety assembly (53); and A limiting ear (34) is formed on the outer peripheral edge of the second fixing plate (33); in the first direction, the limiting ear (34) is located on one side of the quick plug (2); and the elastic buffer pad (31) is provided on the surface of the limiting ear (34).

5. The plug anti-loosening structure according to claim 4, characterized in that: The first fixing plate (32) and the second fixing plate (33) are arranged vertically.

6. The plug anti-loosening structure according to claim 1, characterized in that: The first plug-in portion (21) is sleeved on the fixed joint (1), and a sealing ring (4) is provided inside the first plug-in portion (21), and the sealing ring (4) is interference-fitted with the fixed joint (1).

7. The plug anti-loosening structure according to claim 6, characterized in that: A limiting annular groove (11) is provided on the outer peripheral wall of the fixed joint (1), and a clamping block (211) is provided on the inner wall of the first plug-in portion (21); the clamping block (211) is clamped in the limiting annular groove (11).

8. The plug anti-loosening structure according to claim 7, characterized in that: In the first direction, the sealing ring (4) is located between the second plug-in portion (22) and the clamping block (211), and the thickness of the sealing ring (4) is greater than the thickness of the clamping block (211).

9. The plug anti-loosening structure according to claim 1, characterized in that: The first plug-in portion (21) and the second plug-in portion (22) are arranged vertically; the second plug-in portion (22) is inserted into the infusion pipeline (52) of the cooling system.

10. A battery pack, characterized in that: The invention comprises the plug anti-loosening structure as described in any one of claims 1 to 9.

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