Secondary battery and electric device

Abstract

The secondary battery is provided with an anti-explosion assembly, one end of a main body in the anti-explosion assembly is inserted into a mounting hole of a top cover plate, the other end of the main body is located on the side, away from an electrode assembly, of the top cover plate in the first direction, and a channel penetrating through the main body in the first direction is formed in the main body; the diaphragm is internally connected to the main body to seal the channel, and the main body can be connected with the pipeline, so that when the secondary battery is subjected to thermal runaway, the main body can discharge thermal runaway gas generated by the electrode assembly into the pipeline through the channel, and the thermal runaway gas is subjected to oriented discharge through the pipeline; therefore, short circuit between the thermal runaway gas, electrolyte carried by the thermal runaway gas and other electric parts of the electric equipment is avoided, the use safety of the secondary battery and the electric equipment is ensured, and the service life of the secondary battery and the electric equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a secondary battery and electrical equipment. Background Art

[0002] During the recycling process of secondary batteries, if overcharge, over-discharge or short-circuit occurs, the secondary batteries will cause thermal runaway. The thermal runaway secondary batteries will generate thermal runaway gases inside the shell. The explosion-proof valve can release the thermal runaway gases. However, the explosion-proof valves on existing secondary batteries only discharge the thermal runaway gases, and lack the guidance of the discharged thermal runaway gases, resulting in short circuits between the thermal runaway gases and the electrolyte and other ejected materials carried by them and other electrical components, affecting the service life and safety of the secondary batteries. Utility Model Content

[0003] The utility model aims to provide a secondary battery and electrical equipment to solve the problem that the explosion-proof valve of the current secondary battery lacks guidance when discharging thermal runaway gas, resulting in a decrease in the service life and safety of the secondary battery.

[0004] A first aspect of an embodiment of the present application provides a secondary battery, comprising: a shell having a housing cavity therein, the shell having an opening, and the shell having a first direction; an electrode assembly disposed in the housing cavity; a top cover plate covering the opening, the top cover plate having a mounting hole extending through the top cover plate along the first direction; the secondary battery further comprising: an explosion-proof assembly, the explosion-proof assembly comprising a main body and a diaphragm, the main body extending along the first direction, one end of the main body in the first direction being inserted into the mounting hole, and the other end being located on a side of the top cover plate in the first direction away from the electrode assembly, the main body having a channel extending through the main body along the first direction, the diaphragm being internally connected to the main body to seal the channel; wherein the main body can be connected to a pipeline to discharge the gas generated by the electrode assembly through the pipeline through the channel.

[0005] Optionally, along the first direction, the shell includes a first wall and a second wall arranged opposite to each other, and the main body includes a first end face and a second end face arranged opposite to each other; along the first direction, the spacing between the first wall and the second wall is H1 mm, and the spacing between the first end face and the second end face is H2 mm, satisfying: 0.1H1≤H2≤0.5H2.

[0006] Optionally, a thread is provided on the outer wall of the main body away from one end of the electrode assembly, and the pipe is sleeved on the main body to form a threaded connection; or, a thread is provided on the inner wall of the main body, and the pipe is inserted into the channel to form a threaded connection.

[0007] Optionally, the first end face is provided with a first protrusion, and the second end face is provided with a second protrusion, and the first protrusion and the second protrusion respectively surround the outer peripheral wall of the main body along the circumferential direction of the main body; the outer peripheral wall located between the first protrusion and the second protrusion forms a clamping portion, and the pipe is sleeved on the main body and is clamped and connected to the main body through the clamping portion.

[0008] Optionally, the secondary battery includes a filter, which is disposed in the channel and in contact with the main body; the filter and the main body are an integrated structure, or the filter and the main body are a split structure.

[0009] Optionally, the filter screen and the membrane are spaced apart along the first direction; wherein the filter screen is arranged on a side of the membrane adjacent to the top cover plate in the first direction; or, the filter screen is arranged on a side of the membrane away from the top cover plate in the first direction.

[0010] Optionally, a support portion is protruding from the inner wall of the main body, the support portion extends along the circumferential direction of the main body, and the filter is arranged on the support portion.

[0011] Optionally, the first end face is provided with a first protrusion, which surrounds the outer wall of the main body along the circumferential direction of the main body, and the mounting hole is connected with a connecting portion, which surrounds the first protrusion along the circumferential direction of the main body; the connecting portion is injection-moldedly connected to the first protrusion to form an integrated structure.

[0012] Optionally, the secondary battery includes an injection molded part; a first injection hole is opened on the first protrusion, and a second injection hole is opened on the connecting part; part of the injection molded part is filled in the first injection hole, and part of the injection molded part is filled in the second injection hole to achieve an injection molding connection between the connecting part and the first protrusion.

[0013] A second aspect of the embodiments of the present application provides an electrical device, comprising the secondary battery as described above.

[0014] In summary, the embodiments of the present application provide a secondary battery and an electrical device having the secondary battery, wherein the secondary battery is provided with an explosion-proof component, wherein one end of a main body in the explosion-proof component is inserted into a mounting hole of a top cover plate, and the other end of the main body is located on a side of the top cover plate away from the electrode assembly in a first direction, and a channel is provided in the main body which penetrates the main body along the first direction, and a diaphragm is internally connected to the main body to seal the channel, and the main body can be connected to a pipeline, and when thermal runaway occurs in the secondary battery, the explosion-proof component can discharge the thermal runaway gas generated by the electrode assembly into the pipeline through the channel, and form a guided discharge of the thermal runaway gas through the pipeline, thereby preventing the thermal runaway gas and the ejected materials such as the electrolyte it carries from short-circuiting with other electrical components of the electrical device, thereby ensuring the safety of the secondary battery and the electrical device, and improving the service life of the secondary battery and the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a schematic structural diagram of a secondary battery provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 Exploded diagram of

[0018] Figure 3 This is a schematic diagram of the first structure of the combination of the top cover plate and the explosion-proof component in the secondary battery provided in the embodiment of the present application;

[0019] Figure 4 This is a second structural schematic diagram of the combination of the top cover plate and the explosion-proof component in the secondary battery provided in the embodiment of the present application;

[0020] Figure 5 yes Figure 4 Exploded diagram of

[0021] Figure 6 This is a third structural schematic diagram of the combination of the top cover plate and the explosion-proof component in the secondary battery provided in the embodiment of the present application;

[0022] Figure 7 yes Figure 6 Exploded diagram of

[0023] Figure 8 This is a fourth structural schematic diagram of the combination of the top cover plate and the explosion-proof component in the secondary battery provided in the embodiment of the present application;

[0024] Fig. 9 yes Figure 8 Exploded diagram of

[0025] Fig.10 This is a fifth structural schematic diagram of a combination of a top cover plate and an explosion-proof component in a secondary battery provided in an embodiment of the present application;

[0026] Fig.11 yes Fig.10 Exploded diagram of

[0027] Fig.12 yes Fig.10 AA section view;

[0028] Fig.13 yes Fig.12 A schematic diagram of the enlarged structure at B;

[0029] Fig.14 This is a sixth structural schematic diagram of a combination of a top cover plate and an explosion-proof component in a secondary battery provided in an embodiment of the present application;

[0030] Fig.15 yes Fig.14 Exploded diagram of

[0031] Fig.16 It is a schematic diagram of the combined structure of the secondary battery and the pipeline provided in the embodiment of the present application.

[0032] Description of main reference numerals:

[0033] 100, secondary battery, 10, shell, 101, first wall, 102, second wall, 11, accommodating cavity, 12, opening, 20, electrode assembly, 21, main body, 22, pole ear, 221, positive pole ear, 222, negative pole ear, 30, top cover plate, 301, mounting groove, 31, mounting hole, 311, connecting part, 3111, second injection hole, 32, injection hole, 33, sealing nail, 34, positive pole, 35, negative pole, 40, explosion-proof component, 401, channel, 41, main body, 411, first end face, 4111, first protrusion, 4112, first injection hole, 412, second end face, 4121, second protrusion, 413, peripheral wall, 414, clamping part, 415, supporting part, 42, diaphragm, 50, filter screen, 60, injection molded part;

[0034] 200, pipeline;

[0035] X, first direction, Y, second direction, Z, third direction. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0038] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles refer to a state where the tolerance range is -1% to 1%.

[0041] This embodiment provides an electric device, including a secondary battery 100, and the secondary battery 100 serves as a power supply for the electric device. The electric device may be, but is not limited to, a mobile device (such as a mobile phone, a laptop computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, a plug-in hybrid electric vehicle, an electric bicycle, an electric scooter, an electric golf cart, an electric truck, etc.), an electric train, a ship, a satellite, an energy storage system, etc.

[0042] In some embodiments, a secondary battery 100 is provided. The secondary battery 100 includes a housing 10 , an electrode assembly 20 , a top cover plate 30 , and an explosion-proof assembly 40 .

[0043] Reference Figure 1-2 The housing 10 has a first direction X, a second direction Y and a third direction Z that intersect each other. Figure 1 and Figure 2 In the embodiment shown, the first direction X, the second direction Y and the third direction Z are orthogonal to each other, the secondary battery 100 is a square battery, the first direction X is the height direction of the shell 10, the second direction Y is the length direction of the shell 10, and the third direction Z is the width direction (or thickness direction) of the shell 10. Figure 2 The housing 10 has a receiving cavity 11 inside and an opening 12 therein. Figure 2 In the illustrated embodiment, the housing 10 includes a first wall 101 and a second wall 102 that are oppositely disposed along a first direction X, and the opening 12 is formed in the first wall 101 .

[0044] Reference Figure 2 The electrode assembly 20 is arranged in the accommodating cavity 11 of the shell 10, and the electrode assembly 20 includes a main body 21 and a pole ear 22. The pole ear 22 is arranged on the end surface of the main body 21 adjacent to one end of the first wall 101 in the first direction X. The pole ear 22 includes a positive pole ear 221 and a negative pole ear 222. The positive pole ear 221 and the negative pole ear 222 are arranged at intervals along the second direction Y.

[0045] Reference Figure 1 and Figure 2 The top cover plate 30 covers the opening 12 of the housing 10, and the top cover plate 30 forms a seal with respect to the first wall 101 of the housing 10, referring to Figure 5 , Figure 7 , Fig. 9 , Fig.11as well as Fig.15 The top cover plate 30 is provided with a mounting hole 31 that passes through the top cover plate 30 along a first direction X. The first direction X is equivalent to the thickness direction of the top cover plate 30. The top cover plate 30 covers the opening 12, and the mounting hole 31 is connected to the accommodating cavity 11. Figure 1-2 A positive electrode column 34, an injection hole 32 and a negative electrode column 35 are arranged on the top cover plate 30 at intervals. The positive electrode column 34 can be connected to the positive electrode tab 221, and the negative electrode column 35 can be connected to the negative electrode tab 222. The injection hole 32 passes through the top cover plate 30 along the first direction X. The injection hole 32 is configured to be able to inject electrolyte into the accommodating cavity 11 through the injection hole 32. A sealing nail 33 is inserted in the injection hole 32, and the sealing nail 33 is used to seal the injection hole 32.

[0046] Reference Figure 1 to Figure 15 The explosion-proof assembly 40 includes a main body 41 and a diaphragm 42. The main body 41 extends along the first direction X. One end of the main body 41 in the first direction X is inserted into the mounting hole 31 of the top cover plate 30. The other end of the main body 41 in the first direction X is located on the side of the top cover plate 30 away from the electrode assembly 20. Figure 1 to Figure 4 , Figure 7 as well as Fig.10 The main body 41 is provided with a channel 401 penetrating the main body 41 along the first direction X. The opening of the channel 401 makes the main body 41 form a tubular structure. Figure 1 , Figure 5 , Figure 7 to Figure 10 as well as Figure 12-13 The diaphragm 42 is inscribed in the body 41 to form a seal for the channel 401. Fig.16 The main body 41 of the explosion-proof component 40 can be connected to the pipeline 200 to discharge the gas generated by the electrode assembly 20 through the channel 401 via the pipeline 200. Specifically, the diaphragm 42 is configured to be able to open under a preset pressure to connect the channel 401 with the accommodating cavity 11 through the mounting hole 31, so that the gas generated by the electrode assembly 20 during the cycle can be discharged to the pipeline 200 through the channel 401, and discharged to the outside of the secondary battery 100 through the pipeline 200.

[0047] During the recycling process of existing secondary batteries, if they are overcharged, over-discharged, or short-circuited with other secondary batteries and / or electrical devices, the secondary batteries will suffer from thermal runaway. However, when the secondary batteries suffer from thermal runaway, the explosion-proof valves in the existing secondary batteries simply release the thermal runaway gases generated by the electrode assemblies inside the shell, and lack the guidance of the thermal runaway gases, causing the electrolyte and block ejecta carried in the discharged thermal runaway gases to contact with other secondary batteries, resulting in a short circuit, which in turn increases the risk of heat spread. Moreover, the electrolyte, block ejecta, etc. carried by the thermal runaway gases come into contact with other electrical devices, causing damage and / or short circuit to the electrical devices, thereby affecting the service life of the secondary batteries and the safe use of electrical equipment.

[0048] The secondary battery 100 provided in the embodiment of the present application is provided with an explosion-proof component 40, wherein one end of a main body 41 in the explosion-proof component 40 in the first direction X is inserted into the mounting hole 31 of the top cover plate 30, and a channel 401 penetrating the main body 41 along the first direction X is provided inside the main body 41, and a diaphragm 42 is provided inside the main body 41, and the diaphragm 42 is internally connected to the main body 41 to seal the channel 401, and the main body 41 can be connected to the pipe 200, that is, the secondary battery 100 can be connected to the pipe 200 through the main body 41 when in use, and when the secondary battery 100 is working normally, the diaphragm 42 seals the channel 401 to prevent foreign matter from entering the accommodating cavity 11 through the pipe 200 and the channel 401 of the main body 41 to contaminate the electrode assembly 20, and if the secondary battery 100 is overcharged or over-discharged during the cycle operation, or is short-circuited with other secondary batteries and / or electrical devices, The thermal runaway situation may cause the secondary battery 100 to have a thermal runaway. The electrode assembly 20 of the secondary battery 100 with thermal runaway may generate a large amount of thermal runaway gas in a short time. When the generated thermal runaway gas accumulates to a certain extent, it may break through the diaphragm 42 to open the channel 401. Since the main body 41 is connected to the pipe 200, the thermal runaway gas entering the channel 401 may be discharged to the outside of the secondary battery 100 through the pipe 200. The pipe 200 may guide the thermal runaway gas and the electrolyte, block ejection, etc. carried by it, so as to avoid the electrolyte, block ejection, etc. from contacting with other secondary batteries, slowing down the speed of heat spread caused by thermal runaway, and avoiding the electrolyte, block ejection, etc. carried by the thermal runaway gas from contacting with the electrical components in the electrical equipment to cause a short circuit, thereby improving the safety and service life of the secondary battery 100 and the electrical equipment with the secondary battery 100. Among them, the block ejection may be a fragment of the pole piece or pole ear in the electrode assembly 20.

[0049] In some embodiments, reference Figure 2 , along the first direction X, the distance between the first wall 101 and the second wall 102 of the housing 10 is H1 mm, referring to Figure 1 to Figure 3 , Figure 5 as well as Figure 14-15 The main body 41 includes a first end face 411 and a second end face 412 which are arranged opposite to each other along a first direction X. The spacing between the first end face 411 and the second end face 412 in the first direction X is H2 mm, satisfying: 0.1H1≤H2≤0.5H2. Specifically, H2 can be any value among 0.1H1, 0.2H1, 0.3H1, 0.4H1, 0.5H1 or any value in a range consisting of any two values. When the value of H2 is within the above range, the connection stability between the main body 41 and the pipeline 200 can be guaranteed, the smoothness and stability of the guidance of the thermal runaway gas by the pipeline 200 and the channel 401 in the main body 41 can be guaranteed, and the explosion-proof component 40 is prevented from occupying too much space in the first direction X.

[0050] In some embodiments, reference Figures 1 to 13 A thread is provided on the outer wall 413 of the main body 41 at one end away from the electrode assembly 20 to form an external thread structure. The pipe 200 is sleeved on the main body 41 and is threadedly connected with the main body 41, thereby ensuring the assembly stability between the main body 41 and the pipe 200 and improving the assembly convenience between the main body 41 and the pipe 200.

[0051] In some embodiments, a thread is provided on the inner wall of the main body 41 at one end away from the electrode assembly 20 to form an internal thread structure, and the pipe 200 is inserted into the main body 41 and forms a threaded connection with the main body 41 .

[0052] In some embodiments, reference Fig.14 and Fig.15 The first end surface 411 of the main body 41 is provided with a first protrusion 4111, and the first protrusion 4111 surrounds the outer peripheral wall 413 of the main body 41 along the circumferential direction of the main body 41, and the second end surface 412 is provided with a second protrusion 4121, and the second protrusion 4121 surrounds the outer peripheral wall 413 of the main body 41 along the circumferential direction of the main body 41. The first protrusion 4111 and the second protrusion 4121 are arranged opposite to each other along the first direction X, and the outer peripheral wall 413 between the first protrusion 4111 and the second protrusion 4121 forms a clamping portion 414. The pipe 200 is sleeved on the main body 41 and is clamped and connected with the main body 41 through the clamping portion 414, so as to form a quick-install structure between the pipe 200 and the explosion-proof component 40, realize the rapid assembly of the pipe 200 and the explosion-proof component 40, and improve the assembly efficiency between the pipe 200 and the explosion-proof component 40.

[0053] In some embodiments, reference Figure 5 , Figure 7 , Fig. 9 and Fig.15A first end face 411 of the main body 41 is provided with a first protrusion 4111, and the first protrusion 4111 surrounds the outer peripheral wall 413 of the main body 41 along the circumferential direction of the main body 41. A mounting groove 301 is opened on a side of the top cover plate 30 away from the electrode assembly 20 in the first direction X, and the mounting groove 301 forms an annular groove structure around the mounting hole 31 along the circumferential direction of the mounting hole 31. The first protrusion 4111 is embedded in the mounting groove 301 to improve the assembly stability between the explosion-proof assembly 40 and the top cover plate 30.

[0054] In some embodiments, reference Figures 4 to 7 , Fig. 9 as well as Figure 12 to Figure 15 The secondary battery 100 further includes a filter 50, which is disposed in the channel 401 of the main body 41 and is internally connected to the main body 41. The filter 50 and the main body 41 are an integrated structure. For example, the filter 50 and the main body 41 are welded to form an integrated structure. The filter 50 can filter and / or block the block ejecta carried by the thermal runaway gas entering the channel 401 when the secondary battery 100 has a thermal runaway, thereby preventing the block ejecta from being ejected and clogging the pipeline 200, thereby ensuring the smoothness of the thermal runaway gas discharge.

[0055] In some embodiments, the filter screen 50 and the membrane 42 are spaced apart along the first direction X. Figure 4-5 as well as Figures 9 to 13 The filter screen 50 is arranged on one side of the diaphragm 42 adjacent to the top cover plate 30 in the first direction X, that is, the filter screen 50 can form an early filtration and / or blocking of the block ejections carried by the thermal runaway gas, thereby preventing the block ejections with a larger volume from entering the pipeline 200 through the channel 401, preventing the block ejections from clogging the channel 401 and the pipeline 200, and ensuring that the pipeline 200 guides the discharge of the thermal runaway gas smoothly.

[0056] In some embodiments, the filter screen 50 and the membrane 42 are spaced apart along the first direction X. Figure 6-7 as well as Figure 14-15 The filter screen 50 is disposed on the side of the membrane 42 away from the top cover plate 30 in the first direction X, as shown in FIG. Figure 6-7 as well as Figure 14-15 In the illustrated embodiment, the filter screen 50 is disposed at one end of the channel 401 in the first direction X close to the second end face 412. The filter screen 50 can filter and / or block the block ejecta carried by the thermal runaway gas entering the channel 401, thereby preventing larger block ejecta from entering the pipeline 200, preventing the block ejecta from clogging the pipeline 200, and ensuring smooth guidance of the pipeline 200 for the discharge of the thermal runaway gas.

[0057] In some embodiments, reference Figure 7A support portion 415 is protruding from the inner wall of the main body 41. The support portion 415 extends along the circumferential direction of the main body 41. The filter screen 50 is disposed on the support portion 415. Figure 7 In the illustrated embodiment, the support portion 415 is disposed on an inner wall of the main body 41 at one end adjacent to the second end face 412 in the first direction X. The support portion 415 is annular in shape. The filter screen 50 is welded or glued to the support portion 415 to form an integrated structure between the filter screen 50 and the main body 41. In some implementations, the filter screen 50 is snap-connected or bolted to the support portion 415 to form a split structure between the filter screen 50 and the main body 41.

[0058] In some embodiments, reference Fig. 9 A support portion 415 is protruding from the inner wall of the main body 41. The support portion 415 extends along the circumferential direction of the main body 41. The diaphragm 42 is disposed on the support portion 415. Fig. 9 In the embodiment described above, the support portion 415 is disposed at one end of the inner wall of the main body 41 adjacent to the second end surface 412 in the first direction X, and the support portion 415 is annular in shape.

[0059] In some embodiments, reference Fig.11 and Fig.13 A first end face 411 of the main body 41 is provided with a first protrusion 4111, and the first protrusion 4111 surrounds the outer peripheral wall 413 of the main body 41 along the circumferential direction of the main body 41. A connecting portion 311 is connected in the mounting hole 31 of the top cover plate 30. One end of the main body 41 adjacent to the first end face 411 in the first direction X is inserted into the mounting hole 31, and the connecting portion 311 surrounds the first protrusion 4111 along the circumferential direction of the first protrusion 4111. The first protrusion 4111 and the connecting portion 311 are injection-molded to form an integrated structure, thereby forming an integrated structure between the explosion-proof component 40 and the top cover plate 30, thereby ensuring the assembly stability between the explosion-proof component 40 and the top cover plate 30.

[0060] In some embodiments, reference Figure 10 to Figure 13 The secondary battery 100 further includes an injection molded part 60. The first end surface 411 of the main body 41 is provided with a first protrusion 4111. The first protrusion 4111 surrounds the outer peripheral wall 413 of the main body 41 along the circumferential direction of the main body 41. The mounting hole 31 of the top cover plate 30 is connected with a connecting part 311. Fig.11The first protruding portion 4111 is provided with a first injection hole 4112, the number of the first injection holes 4112 is multiple, and they are spaced apart along the circumferential direction of the first protruding portion 4111. The connecting portion 311 is provided with a second injection hole 3111, the number of the second injection holes 3111 is multiple, and they are spaced apart along the circumferential direction of the connecting portion 311. One end of the main body 41 adjacent to the first end surface 411 in the first direction X is inserted into the mounting hole 31, and the first protruding portion 4111 is connected to the connecting portion 311 by injection molding to form an injection molded part 60. Fig.13 Part of the injection molded part 60 is filled in the first injection hole 4112, and part of the injection molded part 60 is filled in the second injection hole 3111 to achieve the injection molding connection between the connecting portion 311 and the first protruding portion 4111. The opening of the first injection hole 4112 and the second injection hole 3111 can form a container for the injection molding material. After the injection molding part 60 is formed by injection molding, the connection stability and firmness between the connecting portion 311, the injection molded part 60 and the first protruding portion 4111 can be further improved, and the assembly stability between the explosion-proof component 40 and the top cover plate 30 can be improved.

[0061] The technical solutions provided by the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A secondary battery comprising: A shell (10) having a receiving cavity (11) therein, the shell (10) having an opening (12), and the shell (10) having a first direction (X); An electrode assembly (20) is disposed in the accommodating cavity (11); A top cover plate (30) is arranged to cover the opening (12), and a mounting hole (31) is provided on the top cover plate (30) and passes through the top cover plate (30) along the first direction (X); Characterized in that the secondary battery further comprises: An explosion-proof component (40), the explosion-proof component (40) comprising a main body (41) and a diaphragm (42), the main body (41) extending along the first direction (X), one end of the main body (41) in the first direction (X) being inserted into the mounting hole (31), and the other end being located on a side of the top cover plate (30) away from the electrode assembly (20) in the first direction (X), the main body (41) being provided with a channel (401) penetrating the main body (41) along the first direction (X), and the diaphragm (42) being internally connected to the main body (41) to seal the channel (401); The main body (41) can be connected to a pipeline (200) so as to discharge the gas generated by the electrode assembly (20) through the pipeline (200) via the channel (401).

2. The secondary battery according to claim 1, wherein: Along the first direction (X), the housing (10) comprises a first wall (101) and a second wall (102) that are arranged opposite to each other, and the main body (41) comprises a first end surface (411) and a second end surface (412) that are arranged opposite to each other; Along the first direction (X), the distance between the first wall (101) and the second wall (102) is H1 mm, and the distance between the first end surface (411) and the second end surface (412) is H2 mm, satisfying: 0.1H1≤H2≤0.5H2.

3. The secondary battery according to claim 1, wherein: A thread is provided on an outer peripheral wall (413) of the main body (41) at one end away from the electrode assembly (20), and the pipe (200) is sleeved on the main body (41) to form a threaded connection; Alternatively, a thread is provided on the inner wall of the main body (41) at one end away from the electrode assembly (20), and the pipe (200) is inserted into the channel (401) to form a threaded connection.

4. The secondary battery according to claim 2, characterized in that: The first end surface (411) is provided with a first protrusion (4111), and the second end surface (412) is provided with a second protrusion (4121), and the first protrusion (4111) and the second protrusion (4121) respectively surround the outer peripheral wall (413) of the main body (41) along the circumferential direction of the main body (41); The outer peripheral wall (413) located between the first protrusion (4111) and the second protrusion (4121) forms a clamping portion (414), and the pipe (200) is sleeved on the main body (41) and is clamped and connected to the main body (41) through the clamping portion (414).

5. The secondary battery according to claim 1, wherein: The secondary battery comprises a filter (50), wherein the filter (50) is arranged in the channel (401) and is internally connected to the main body (41); The filter screen (50) and the main body (41) are of an integrated structure, or the filter screen (50) and the main body (41) are of a split structure.

6. The secondary battery according to claim 5, characterized in that: The filter screen (50) and the membrane (42) are arranged at intervals along the first direction (X); Wherein, the filter screen (50) is arranged on a side of the membrane (42) adjacent to the top cover plate (30) in the first direction (X); Alternatively, the filter screen (50) is arranged on a side of the membrane (42) facing away from the top cover plate (30) in the first direction (X).

7. The secondary battery according to claim 5, characterized in that: A support portion (415) is protrudingly provided on the inner wall of the main body (41), the support portion (415) extends along the circumferential direction of the main body (41), and the filter screen (50) is arranged on the support portion (415).

8. The secondary battery according to claim 2, wherein: The first end surface (411) is provided with a first protrusion (4111), the first protrusion (4111) surrounds the outer peripheral wall (413) of the main body (41) along the circumferential direction of the main body (41), the mounting hole (31) is internally connected with a connecting portion (311), and the connecting portion (311) surrounds the first protrusion (4111) along the circumferential direction of the main body (41); The connecting portion (311) and the first protruding portion (4111) are connected by injection molding to form an integrated structure.

9. The secondary battery according to claim 8, characterized in that The secondary battery comprises an injection molded part (60); The first protruding portion (4111) is provided with a first injection hole (4112), and the connecting portion (311) is provided with a second injection hole (3111); Part of the injection molded part (60) is filled in the first injection molded hole (4112), and part of the injection molded part (60) is filled in the second injection molded hole (3111), so as to realize the injection molding connection between the connecting part (311) and the first protruding part (4111).

10. An electrical device, characterized in that: The invention comprises the secondary battery according to any one of claims 1 to 9.

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