Structure for preventing secondary short circuit in battery, and battery

Abstract

A structure for preventing a secondary short circuit in a battery, and a battery. The structure for preventing a secondary short circuit in a battery comprises a first electrode output (1), a second electrode post terminal (2), an insulation sealing assembly (3), and a heat-resistant insulation structure, wherein the first electrode output (1) is provided with a first through hole (101); the second electrode terminal post (2) is arranged at the first through hole (101), and at least part of the second electrode terminal post (2) is inserted into the first through hole (101); the insulation sealing assembly (3) is arranged between the second electrode terminal post (2) and the first electrode output (1), and the insulation sealing assembly (3) is configured to perform insulation sealing between the second electrode terminal post (2) and the first electrode output (1), so as to form primary insulation protection; and the heat-resistant insulation structure is arranged between the first electrode output (1) and the second electrode terminal post (2), so as to form secondary insulation protection between the second electrode terminal post (2) and the first electrode output (1).

Description

Battery secondary short circuit prevention structure and battery

[0001] This application claims priority to Chinese Patent Application No. 202411092064.9, filed on August 09, 2024, Chinese Patent Application No. 202411092069.1, filed on August 09, 2024, Chinese Patent Application No. 202411092060.0, filed on August 09, 2024, Chinese Patent Application No. 202411249142.1, filed on September 06, 2024, Chinese Patent Application No. 202411249148.9, filed on September 06, 2024, Chinese Patent Application No. 202411249137.0, filed on September 06, 2024, and Chinese Patent Application No. 202411249138.5, filed on September 06, 2024, the contents of all of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of energy storage devices, for example to a battery secondary short circuit prevention structure and battery. BACKGROUND

[0003] With the continuous development of new energy technology, the safety of the battery has also become one of the important problems that the industry needs to solve. Once the internal cell of the new energy battery experiences thermal runaway (such as short circuit), high heat will be generated, and when the high heat is conducted to the pole, it will melt the sealing ring, the outer plastic and / or the inner plastic, thereby possibly causing the positive and negative poles to be short-circuited, leading to secondary short circuit.

[0004] For example, a cylindrical battery is provided with a positive pole and a negative output shell. In order to ensure the insulation and sealing between the positive pole and the shell, a sealing ring and multiple insulation rings are arranged between the positive pole and the shell. The sealing ring is arranged to block the gap between the inner wall of the through hole of the positive pole and the shell and is used for insulation. The multiple insulation rings are arranged to ensure the insulation between the outer connecting part of the shell and the positive pole and the inner connecting part of the shell and the positive pole. That is, according to any contact position between the positive pole and the shell, a corresponding insulation structure is arranged. When the internal battery cell is in thermal runaway (such as short circuit), a large amount of heat will be generated in a short time. The heat will be transferred to the inner connecting part of the positive pole closest to the battery cell, the first through hole around the positive pole and the shell, and the outer connecting part of the positive pole away from the battery cell. The temperature of the positive pole and the shell at this position will quickly rise, so that the sealing ring and the insulation ring will also absorb a large amount of heat, and even the melting point will be reached, causing the outer layer of the positive and negative end faces of the sealing ring to melt or the insulation ring to melt. Once the melting phenomenon occurs, it may cause insulation failure and the risk of contact short circuit between the positive pole and the shell. Once the contact short circuit occurs, it will further increase the temperature rise speed of thermal runaway, causing greater danger and loss. SUMMARY

[0005] The application provides a battery secondary short circuit prevention structure, which can help to avoid the short circuit between the positive output and the negative output during thermal runaway, thereby helping to prevent secondary short circuit.

[0006] The application provides a battery secondary short circuit prevention structure, which comprises a first pole output, a first through hole is formed in the first pole output; a second pole, the second pole is arranged at the first through hole, and at least part of the second pole is inserted into the first through hole; an insulation sealing assembly, the insulation sealing assembly is arranged between the second pole and the first pole output, and the insulation sealing assembly is arranged to insulate and seal between the second pole and the first pole output, to form a primary insulation protection; a heat-resistant insulation structure, the heat-resistant insulation structure is arranged between the first pole output and the second pole, so as to form a secondary insulation protection between the second pole and the first pole output.

[0007] The application provides a battery, which comprises a battery secondary short circuit prevention structure according to any one of the above-mentioned schemes and an internal battery cell. BRIEF DESCRIPTION OF DRAWINGS

[0008] Fig. 1 is an exploded view of part of the structure of the battery provided in the first embodiment of the application;

[0009] Fig. 2 is a partial cross-sectional view of the battery secondary short circuit prevention structure provided in the first embodiment of the application;

[0010] Fig. 3 is a partial cross-sectional view II of the battery secondary short circuit prevention structure according to Embodiment 1 of the present application;

[0011] Fig. 4 is a partial cross-sectional view III of the battery secondary short circuit prevention structure according to Embodiment 1 of the present application;

[0012] Fig. 5 is a partial cross-sectional view of the battery according to Embodiment 1 of the present application;

[0013] Fig. 6 is an exploded view of a partial structure of the battery according to Embodiment 2 of the present application;

[0014] Fig. 7 is a partial cross-sectional view I of the battery secondary short circuit prevention structure according to Embodiment 2 of the present application;

[0015] Fig. 8 is a partial cross-sectional view II of the battery secondary short circuit prevention structure according to Embodiment 2 of the present application;

[0016] Fig. 9 is a partial cross-sectional view of the battery according to Embodiment 2 of the present application;

[0017] Fig. 10 is an exploded view of a partial structure of the battery according to Embodiment 3 of the present application;

[0018] Fig. 11 is a partial cross-sectional view I of the battery secondary short circuit prevention structure according to Embodiment 3 of the present application;

[0019] Fig. 12 is a partial cross-sectional view II of the battery secondary short circuit prevention structure according to Embodiment 3 of the present application;

[0020] Fig. 13 is a partial cross-sectional view of the battery according to Embodiment 3 of the present application;

[0021] Fig. 14 is a structural schematic view I of the battery according to Embodiment 4 of the present application;

[0022] Fig. 15 is an exploded view of the battery according to Embodiment 4 of the present application;

[0023] Fig. 16 is a structural schematic view II of the battery according to Embodiment 4 of the present application;

[0024] Fig. 17 is a cross-sectional view along A-A in Fig. 16;

[0025] Fig. 18 is an enlarged view of B in Fig. 17;

[0026] Fig. 19 is a structural schematic view of the battery secondary short circuit prevention structure according to Embodiment 5 of the present application;

[0027] Fig. 20 is an exploded view I of the battery secondary short circuit prevention structure according to Embodiment 5 of the present application;

[0028] Fig. 21 is an exploded view II of the battery secondary short circuit prevention structure according to Embodiment 5 of the present application;

[0029] Fig. 22 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 5 of the present application;

[0030] Fig. 23 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 5 of the present application;

[0031] Fig. 24 is a structural schematic view of a battery secondary short circuit prevention structure according to Embodiment 6 of the present application;

[0032] Fig. 25 is an exploded view of a battery secondary short circuit prevention structure according to Embodiment 6 of the present application;

[0033] Fig. 26 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 6 of the present application;

[0034] Fig. 27 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 6 of the present application;

[0035] Fig. 28 is a structural schematic view of a battery secondary short circuit prevention structure according to Embodiment 7 of the present application;

[0036] Fig. 29 is an exploded view of a battery secondary short circuit prevention structure according to Embodiment 7 of the present application;

[0037] Fig. 30 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 7 of the present application;

[0038] Fig. 31 is a cross-sectional view of a battery secondary short circuit prevention structure according to Embodiment 7 of the present application.

[0039] In the figure: 1, first pole output; 101, first through hole; 102, positioning ring; 1021, second end face; 1022, avoiding groove; 103, third end face; 104, riveting pipe-shaped structure; 105, first face; 106, second face; 2, second pole pole column; 21, middle connecting part; 211, first end face; 22, outer connecting part; 23, inner connecting part; 231, fifth end face; 24, inserting part; 241, first positioning groove; 242, second positioning groove; 25, annular protruding part; 251, sixth end face; 252, seventh end face; 26, first part; 27, second part; 3, insulation sealing assembly; 31, sealing ring; 32, inner insulation ring; 321, annular part; 322, tubular part; 33, outer insulation ring; 331, first positioning groove; 411, first heat-resistant insulation ring; 4111, first insulation ring; 4112, second insulation ring; 4113, first connecting part; 412, second heat-resistant insulation ring; 4121, fourth insulation ring; 4122, 4123, third connecting part; fifth insulation ring; 413, first heat-resistant insulation pipe; 414, third heat-resistant insulation ring; 415, fourth heat-resistant insulation ring; 416, second heat-resistant insulation pipe; 417, supporting connecting ring; 42, heat-resistant insulation layer; 421, first heat-resistant insulation layer; 422, second heat-resistant insulation layer; 423, third heat-resistant insulation layer; 4241, first region heat-resistant insulation layer; 4242, second region heat-resistant insulation layer; 4243, third region heat-resistant insulation layer; 4251, fourth region heat-resistant insulation layer; 4252, fifth region heat-resistant insulation layer; 4253, sixth region heat-resistant insulation layer; 426, sixth heat-resistant insulation layer; 4261, seventh region heat-resistant insulation layer; 4262, eighth region heat-resistant insulation layer; 4263, ninth region heat-resistant insulation layer; 427, seventh heat-resistant insulation layer; 4281, tenth region heat-resistant insulation layer; 4282, eleventh region heat-resistant insulation layer; 429, ninth heat-resistant insulation layer; 4291, twelfth region heat-resistant insulation layer; 4292, thirteenth region heat-resistant insulation layer; 4293, fourteenth region heat-resistant insulation layer; 4294, fifteenth region heat-resistant insulation layer; 4295, sixteenth region heat-resistant insulation layer; 430, tenth heat-resistant insulation layer; 4301, seventeenth region heat-resistant insulation layer; 4302, eighteenth region heat-resistant insulation layer; 4303, nineteenth region heat-resistant insulation layer; 4304, twentieth region heat-resistant insulation layer; 5, third insulation ring; 6, second connecting part; 7, riveting block; 701, second through hole; 702, first side face; 703, fourth end face; 200, electric core. DETAILED DESCRIPTION

[0040] The present application will be described below in conjunction with the accompanying drawings and embodiments. The embodiments described herein are merely intended to explain the present application, but not to limit the present application. For the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0041] In the description of the present application, unless specifically defined and limited otherwise, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the meaning of the above terms in the present application can be understood according to the situation.

[0042] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0043] In the description of the present embodiment, the terms "up", "down", "left", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0044] Please refer to FIG. 1 to FIG. 31 to introduce the battery secondary short circuit prevention structure and the battery provided by the present application.

[0045] When the new energy battery is used, once the internal cell 200 of the new energy battery has thermal runaway (such as short circuit), high heat will be generated, and when the high heat is conducted to the second pole post 2, the insulating sealing assembly 3 will be melted, thereby possibly causing the positive output and the negative output to be short-circuited, causing secondary short circuit.

[0046] Therefore, the present embodiment provides a battery secondary short circuit prevention structure, which can insulate the positive output and the negative output when thermal runaway occurs in the battery, thereby avoiding short circuit between the two, which helps to prevent battery secondary short circuit.

[0047] The battery secondary short circuit prevention structure comprises a first pole output 1, a second pole post 2, an insulation sealing assembly 3, and a heat-resistant insulation structure. The first pole output 1 is provided with a first through hole 101; the second pole post 2 is arranged at the first through hole 101, and at least part of the second pole post 2 is inserted into the first through hole 101; the insulation sealing assembly 3 is arranged between the second pole post 2 and the first pole output 1, and the insulation sealing assembly 3 is arranged to insulate and seal between the second pole post 2 and the first pole output 1 to form a primary insulation protection; and the heat-resistant insulation structure is arranged between the first pole output 1 and the second pole post 2 to form a secondary insulation protection between the second pole post 2 and the first pole output 1, so that even if the insulation sealing ring 31 fails due to high temperature caused by thermal runaway, the heat-resistant insulation structure still provides secondary insulation protection.

[0048] The battery secondary short circuit prevention structure in the embodiment can ensure insulation protection between the first pole output 1 and the second pole post 2 in a high temperature situation, avoid the occurrence of secondary short circuit, and thus help prevent the battery from causing greater danger and damage due to the aggravation of thermal runaway caused by secondary short circuit, that is, help prevent the positive output and the negative output from being short-circuited when thermal runaway occurs in the battery, and improve the safety of the battery.

[0049] In the embodiment, one of the first pole output 1 and the second pole post 2 is a positive output, and the other is a negative output.

[0050] The first pole output 1 comprises a shell and a cover plate, and the second pole post 2 is inserted into the first through hole 101 of the cover plate or the first through hole 101 of the shell. The design is mainly based on the type of the battery and the design position of the second pole post 2.

[0051] The second pole post 2 is a positive post or a negative post, which is related to cylindrical batteries, square cell batteries, etc., and can be further set according to actual needs.

[0052] The second pole post 2 is arranged at the through hole of the first pole output 1 in a manner including riveting connection between the second pole post 2 and the first pole output 1, or glue connection between the second pole post 2 and the first pole output 1, or further including a riveting block 7, the second pole post 2 is arranged in the first through hole 101 and is in riveting connection with the riveting block 7, or the first pole output 1 has a riveting flange, the riveting flange is coaxially arranged with the first through hole 101 and surrounds the first through hole 101, and the riveting flange is riveted and bent to cover at least part of the second pole post 2. The above four fixing modes of the second pole post 2 and the first pole output 1 basically cover all connection modes, and in multiple connection modes, a heat-resistant insulation structure can be arranged as an insulation protection structure for preventing secondary short circuit when the battery is in thermal runaway. Of course, the fixing mode between the two also needs to be selected according to actual needs.

[0053] In different fixing modes, the second pole post 2 also has different structural arrangements. Optionally, when the second pole post 2 is in riveting connection with the first pole output 1 and when the second pole post 2 is in riveting connection with the riveting block 7, the second pole post 2 includes an inner connecting portion 23, a middle connecting portion 21 and an outer connecting portion 22 arranged in sequence along the axial direction of the second pole post 2, the middle connecting portion 21 is partially arranged in the through hole, and the inner connecting portion 23 and the outer connecting portion 22 both protrude radially out of the through hole to limit and fix the second pole post 2. When the second pole post 2 is in glue connection with the first pole output 1, the second pole post 2 includes an inner connecting portion 23 and an insertion portion 24 connected with each other, and a positioning groove is arranged on the side surface of the insertion portion 24 to be in glue connection with the first pole output 1. When the second pole post 2 is fixed by the riveting flange, the second pole post 2 includes a body portion and a ring-shaped protruding portion 25, the body portion is used as an inner and outer electrical connecting portion, and the ring-shaped protruding portion 25 is arranged in riveting connection with the riveting flange. Of course, the structure of the second pole post 2 also needs to be designed according to actual design requirements and space requirements.

[0054] The insulation sealing assembly 3 is not only used for insulation between the second pole post 2 and the first pole output 1, but also used for sealing when the second pole post 2 is connected with the first through hole 101 of the first pole output 1, and the structure is particularly important. Optionally, the insulation sealing assembly 3 comprises an inner insulation ring 32, a sealing ring 31 and an outer insulation ring 33 arranged along the axial direction of the insulation sealing assembly 3 in sequence, the sealing ring 31 is sleeved on the middle connecting part 21, and the sealing ring 31 is clamped between the end face of the first pole output 1 away from the inside of the battery and the end face of the outer connecting part 22 facing the inside of the battery, so as to realize the sealing insulation between the second pole post 2 and the hole wall of the first through hole 101; the inner insulation ring 32 is sleeved on the middle connecting part 21, and the inner insulation ring 32 is partially clamped between the end face of the inner connecting part 23 away from the inside of the battery and the end face of the first pole output 1 facing the inside of the battery, so as to realize the insulation between the inner connecting part 23 of the second pole post 2 and the first pole output 1; the outer insulation ring 33 is sleeved on the outer connecting part 22, and is partially clamped between the outer connecting part 22 and the end face of the first pole output 1 away from the inside of the battery, so as to realize the insulation between the outer connecting part 22 of the second pole post 2 and the first pole output 1.

[0055] As the secondary insulation protection structure between the second pole post 2 and the first pole output 1, in the embodiment, the heat-resistant insulation structure is a ring-shaped or tubular heat-resistant insulation structure or a heat-resistant insulation plating structure, which can realize the heat-resistant insulation effect.

[0056] The heat-resistant insulation structure comprises a heat-resistant insulation piece, and the heat-resistant insulation piece is sleeved on the second pole post 2, so that the heat-resistant insulation structure is arranged between the second pole post 2 and the first pole output 1 to form the secondary insulation protection.

[0057] The heat-resistant insulation piece can be ring-shaped or tubular, so as to realize the sleeving mounting with the second pole post 2.

[0058] The material of the heat-resistant insulation piece is a positive temperature coefficient (PTC) thermistor, ceramic or mica, so that the heat-resistant insulation piece has an insulation effect when the battery is in thermal runaway.

[0059] Optionally, the material of the heat-resistant insulation piece is a ceramic PTC thermistor or an organic PTC thermistor, and the ceramic PTC thermistor belongs to a kind of ceramic materials. The PTC thermistor is a typical semiconductor resistance with temperature sensitivity, and its resistance value increases step by step with the increase of temperature when the temperature exceeds a certain value. At high temperature in thermal runaway, the resistance value of the PTC thermistor increases, which can play an insulation effect and prevent the positive output and the negative output of the battery at the position of the heat-resistant insulation piece from being short-circuited.

[0060] Optionally, the material of the heat-resistant insulation part can also be other ceramic materials in addition to the ceramic PTC thermistor, and ceramic materials generally have insulation properties.

[0061] Optionally, the material of the heat-resistant insulation part can also be mica or composite mica, i.e., a composite material containing a mica component, which can withstand heat and has good insulation performance at high heat runaway temperatures.

[0062] The heat-resistant insulation structure includes a heat-resistant insulation layer 42 arranged between the first pole output 1 and the second pole post 2, i.e., the heat-resistant insulation structure is arranged between the second pole post 2 and the first pole output 1 to form secondary insulation protection.

[0063] The heat-resistant insulation layer 42 is a layer of heat-resistant insulation ceramic formed by electroplating or a layer of heat-resistant insulation material formed by spraying.

[0064] Optionally, the heat-resistant insulation layer 42 is a layer of electroplated aluminum oxide, which has good insulation properties and can withstand high temperatures, and the electroplated aluminum oxide layer can ensure structural strength and connection strength.

[0065] Optionally, the thickness of the heat-resistant insulation layer 42 is greater than 0.01 mm to ensure its insulation performance. Of course, the value of the thickness also needs to consider the cost and space occupied.

[0066] However, the position of the heat-resistant insulation structure is also an important consideration for its insulation protection. In the present embodiment, the heat-resistant insulation structure is arranged at least partially at the connection between the second pole post 2 and the first pole output 1.

[0067] The heat-resistant insulation structure is arranged at least partially between the second pole post 2 and the insulation sealing assembly 3 and / or at least partially between the second pole post 2 and the first pole output 1, which can achieve the heat-resistant insulation effect and the effect of secondary insulation protection.

[0068] The heat-resistant insulation structure is arranged between the middle connecting part 21 of the second pole post 2 and the insulation sealing assembly 3, between the inner connecting part 23 of the second pole post 2 and the insulation sealing assembly 3, and / or between the outer connecting part 22 of the second pole post 2 and the insulation sealing assembly 3. Alternatively, the heat-resistant insulation structure is arranged between the end face of the first pole output 1 facing away from the inside of the battery and the insulation sealing assembly 3, between the end face of the first pole output 1 facing toward the inside of the battery and the insulation sealing assembly 3, and / or between the hole wall of the first through hole 101 of the first pole output 1 and the insulation sealing assembly 3, which can all achieve the effect of insulation protection. Of course, the arrangement position needs to be adaptively arranged according to actual insulation requirements and heat runaway conditions, which is not limited herein.

[0069] Optionally, if at least part of the second pole post 2 and the insulating sealing assembly 3 and at least part of the second pole post 2 and the first pole output 1 are provided with heat-resistant insulation structures, a heat-resistant insulation connecting part can be provided between the two to connect the heat-resistant insulation structures at the two positions, which can support the heat-resistant insulation structures to better achieve insulation between the second pole post 2 and the first pole output 1 and facilitate installation.

[0070] The embodiment also provides a battery including the battery secondary short circuit prevention structure described above. In this embodiment, the battery is a cylindrical battery, and of course, in other embodiments, it can also be a square battery. The battery can help prevent secondary short circuit and improve safety.

[0071] The battery secondary short circuit prevention structure and the battery provided by the present application are described below through multiple embodiments.

[0072] Embodiment One

[0073] As shown in FIGS. 1-3, the battery secondary short circuit prevention structure of the embodiment includes a first pole output 1, a second pole post 2, an insulating sealing assembly 3, and a heat-resistant insulation structure. The difference between this embodiment and other embodiments is the heat-resistant insulation structure.

[0074] In this embodiment, the heat-resistant insulation structure includes a heat-resistant insulation part. The first pole output 1 is provided with a first through hole 101, and the second pole post 2 includes a middle connecting part 21 and an outer connecting part 22 arranged in sequence along the axial direction of the second pole post 2, the middle connecting part 21 is partially inserted into the first through hole 101, and the outer connecting part 22 protrudes out of the first through hole 101 along the radial direction of the second pole post 2, that is, the radial dimension of the outer connecting part 22 is greater than the dimension of the first through hole 101. A sealing ring 31 is sleeved on the middle connecting part 21, and the sealing ring 31 is clamped between the end face of the first pole output 1 away from the inside of the battery and the end face of the outer connecting part 22 facing the inside of the battery. The heat-resistant insulation part includes a first heat-resistant insulation ring 411, the first heat-resistant insulation ring 411 is sleeved on the middle connecting part 21, and the first heat-resistant insulation ring 411 is clamped between the end face of the outer connecting part 22 facing the inside of the battery and the sealing ring 31 or the first heat-resistant insulation ring 411 is clamped between the sealing ring 31 and the end face of the first pole output 1 away from the inside of the battery. The material of the first heat-resistant insulation ring 411 is organic PTC thermistor, ceramic, or mica, so that the first heat-resistant insulation ring 411 has an insulation effect when the battery is out of control.

[0075] Even if the high temperature caused by the thermal runaway of the battery melts the sealing ring 31, the first heat-resistant insulation ring 411 can still have an insulation effect, whether it is arranged between the outer connecting portion 22 and the sealing ring 31 or between the sealing ring 31 and the first pole output 1, which helps to ensure the insulation between the outer connecting portion 22 of the second pole and the first pole output 1, and helps to prevent the short circuit between the second pole and the first pole output 1 after the sealing ring 31 melts, which can cause greater danger and loss, i.e., the secondary short circuit prevention structure of the battery helps to avoid the short circuit between the positive output and the negative output during thermal runaway.

[0076] Optionally, the material of the first heat-resistant insulation ring 411 is a ceramic PTC thermistor or an organic PTC thermistor. The ceramic PTC thermistor belongs to a kind of ceramic materials. The PTC thermistor is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain value, the resistance value of the PTC thermistor increases with the increase of the temperature in a step manner. At a high temperature during thermal runaway, the resistance value of the PTC thermistor increases, i.e., it can play an insulation role to prevent the short circuit between the positive output and the negative output of the battery at the position of the first heat-resistant insulation ring 411.

[0077] Optionally, the material of the first heat-resistant insulation ring 411 can also be other ceramic materials in addition to the ceramic PTC thermistor. Ceramic materials generally have insulation properties.

[0078] Optionally, the material of the first heat-resistant insulation ring 411 can also be mica or composite mica. Composite mica is a composite material containing mica components, which can withstand heat and has good insulation performance at a high temperature during thermal runaway.

[0079] Optionally, the first heat-resistant insulation ring 411 includes a first insulation ring 4111 and a second insulation ring 4112. The first insulation ring 4111 is clamped between the end face of the outer connecting portion 22 facing the inside of the battery and the sealing ring 31, and the second insulation ring 4112 is clamped between the sealing ring 31 and the end face of the first pole output 1 away from the inside of the battery.

[0080] As shown in FIG. 2, optionally, the inner side edge of the first insulation ring 4111 abuts against the middle connecting portion 21 to prevent the deformation of the outer connecting portion 22 at a high temperature, and the inner hole of the first insulation ring 4111 contacts the first pole output 1.

[0081] Optionally, the outer side edge of the first insulation ring 4111 abuts against the outer insulation ring 33. The outer insulation ring 33 is sleeved on the outer connecting portion 22 and partially clamped between the outer connecting portion 22 and the end face of the first pole output 1 away from the inside of the battery. The first insulation ring 4111 can be in abutment with the outer insulation ring 33, and both of them completely cover the annular end face of the outer connecting portion 22 facing the first pole output 1, which can maximize the insulation between them.

[0082] As shown in FIG. 3, optionally, the inner side edge of the first insulation ring 4111 abuts the middle connecting part 21, preventing the outer connecting part 22 from deforming at high temperature, and after the sealing ring 31 melts, the deformed outer connecting part 22 contacts the first pole output 1 through the inner hole of the first insulation ring 4111.

[0083] Optionally, the outer side edge of the first insulation ring 4111 abuts the outer insulation ring 33, that is, the first insulation ring 4111 can be butt-jointed with the outer insulation ring 33, and both of them completely cover the annular end face of the outer connecting part 22 towards the first pole output 1, that is, even if the sealing ring 31 completely melts, the spacing insulation between the outer connecting part 22 and the first pole output 1 can be guaranteed to the maximum.

[0084] Optionally, the first heat-resistant insulation ring 411 further comprises a first connecting part 4113, which is arranged to connect the first insulation ring 4111 and the second insulation ring 4112. Optionally, the material of the first connecting part 4113 is organic PTC thermistor, ceramic or mica, so that the first connecting part 4113 has an insulation effect when the battery is out of control. Optionally, the material of the first connecting part 4113 is ceramic PTC thermistor or organic PTC thermistor. Optionally, the first connecting part 4113, the first insulation ring 4111 and the second insulation ring 4112 are integrally formed.

[0085] Optionally, the first connecting part 4113 is tubular, and one end of the first connecting part 4113 along the axial direction thereof is connected to the first insulation ring 4111, and the other end is connected to the second insulation ring 4112. The first connecting part 4113 is sleeved on the middle connecting part 21, or the first connecting part 4113 is sleeved at the outer ring of the sealing ring 31. The first connecting part 4113 has the functions of connecting and supporting, and after the sealing ring 31 melts, the first connecting part 4113 can fix the spacing between the outer connecting part 22 and the first pole output 1, further ensuring the insulation between the outer connecting part 22 and the first pole output 1. Optionally, the cross section of the first connecting part 4113, the first insulation ring 4111 and the second insulation ring 4112 is H-shaped, C-shaped or similar to T-shaped.

[0086] Optionally, in some embodiments, only the first insulation ring 4111 is arranged, in some other embodiments, only the second insulation ring 4112 is arranged, in some other embodiments, both the first insulation ring 4111 and the second insulation ring 4112 are arranged, and they are arranged in separate bodies, and in some other embodiments, both the first insulation ring 4111 and the second insulation ring 4112 are arranged, and they are connected through the first connecting part 4113.

[0087] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole post 2 is inserted into the first through hole 101 of the cover plate or the first through hole 101 of the shell. That is, the first pole output 1 is the cover plate or the shell. When the first pole output 1 is the cover plate, the battery secondary short circuit prevention structure can be used to manufacture a square battery, and when the first pole output 1 is the shell, the battery secondary short circuit prevention structure can be used to manufacture a cylindrical battery.

[0088] In some optional embodiments, the insulating sealing assembly 3 further comprises an inner insulating ring 32, the battery secondary short circuit prevention structure further comprises a third insulating ring 5, the second pole post 2 further comprises an inner connecting portion 23, the inner connecting portion 23 is connected to one end of the middle connecting portion 21 away from the outer connecting portion 22, the inner insulating ring 32 is sleeved on the middle connecting portion 21, and the inner insulating ring 32 is partially clamped between the end face of the inner connecting portion 23 away from the inside of the battery and the end face of the first pole output 1 towards the inside of the battery. The third insulating ring 5 is sleeved on the middle connecting portion 21, and the third insulating ring 5 is clamped between the end face of the inner connecting portion 23 away from the inside of the battery and the inner insulating ring 32, or the third insulating ring 5 is clamped between the inner insulating ring 32 and the end face of the first pole output 1 towards the inside of the battery.

[0089] The inner insulating ring 32 may also melt and fail at high temperature when the battery is in thermal runaway, and the third insulating ring 5 has an insulating effect no matter whether it is arranged between the inner insulating ring 32 and the end face of the inner connecting portion 23 away from the inside of the battery or between the end face of the first pole output 1 towards the inside of the battery and the inner insulating ring 32. The third insulating ring 5 can ensure insulation between the inner connecting portion 23 and the first pole output 1, and help prevent greater danger and loss caused by short circuit between the inner connecting portion 23 and the first pole output 1.

[0090] Optionally, in some embodiments, the first insulating ring 4111 is provided with a third insulating ring 5 arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery. In yet other embodiments, the first insulating ring 4111 is provided with a third insulating ring 5 arranged between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32. In yet other embodiments, the first insulating ring 4111 is provided with two third insulating rings 5, which are respectively arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery and between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32. In yet other embodiments, the second insulating ring 4112 is provided with a third insulating ring 5 arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery. In yet other embodiments, the second insulating ring 4112 is provided with a third insulating ring 5 arranged between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32. In yet other embodiments, the second insulating ring 4112 is provided with two third insulating rings 5, which are respectively arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery and between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32. In yet other embodiments, the first insulating ring 4111 and the second insulating ring 4112 are provided with a third insulating ring 5 arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery. In yet other embodiments, the first insulating ring 4111 and the second insulating ring 4112 are provided with a third insulating ring 5 arranged between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32. In yet other embodiments, the first insulating ring 4111 and the second insulating ring 4112 are provided with two third insulating rings 5, which are respectively arranged between the inner insulating ring 32 and the end surface of the inner connecting portion 23 facing away from the inside of the battery and between the end surface of the first electrode output 1 facing toward the inside of the battery and the inner insulating ring 32.

[0091] In the above embodiments, when the first insulating ring 4111 and the second insulating ring 4112 are both provided, the first connecting portion 4113 can also be optionally provided. When two third insulating rings 5 are both provided, a connecting member can also be optionally provided to connect the two third insulating rings 5 and fix the position therebetween. Of course, whether the first insulating ring 4111, the second insulating ring 4112 or the third insulating ring 5, they can all be integrally formed with the sealing ring 31 or the inner insulating ring 32 by encapsulation, which is not limited herein.

[0092] As shown in FIG. 4, optionally, the battery secondary short circuit prevention structure further comprises a second connecting part 6, the third insulation ring 5 is clamped between the inner insulation ring 32 and the end surface of the first pole output 1 facing the inside of the battery, the first heat-resistant insulation ring 411 is clamped between the sealing ring 31 and the end surface of the first pole output 1 away from the inside of the battery, that is, the first heat-resistant insulation ring 411 is provided with a second insulation ring 4112, and the second connecting part 6 is arranged to connect the third insulation ring 5 and the first heat-resistant insulation ring 411, that is, the third insulation ring 5 and the second insulation ring 4112.

[0093] Optionally, the second connecting part 6 is tubular, one end of the second connecting part 6 is connected to the third insulation ring 5 along the axis of the second connecting part 6, and the other end of the second connecting part 6 is connected to the first heat-resistant insulation ring 411, and the second connecting part 6 is arranged to fit the inner wall of the first through hole 101. When the sealing ring 31 and the inner insulation ring 32 are both melted, the second connecting part 6 can avoid the short circuit between the inner wall of the first through hole 101 on the first pole output 1 and the middle connecting part 21. When the inner wall of the second insulation ring 4112 abuts against the middle connecting part 21, the second connecting part 6 is connected to the second insulation ring 4112, and can also fix the distance between the middle connecting part 21 and the inner wall of the first through hole 101 on the first pole output 1, further ensuring the insulation between the middle connecting part 21 and the first pole output 1. Optionally, the cross section of the second connecting part 6, the third insulation ring 5 and the second insulation ring 4112 as a whole is H-shaped, C-shaped or similar to T-shaped.

[0094] Optionally, the material of the third insulation ring 5 is organic PTC thermistor, ceramic or mica, so that the third insulation ring 5 has insulation effect when the battery is in thermal runaway. Optionally, the material of the third insulation ring 5 is ceramic PTC thermistor or organic PTC thermistor.

[0095] Optionally, the material of the second connecting part 6 is organic PTC thermistor, ceramic or mica, so that the second connecting part 6 has insulation effect when the battery is in thermal runaway. Optionally, the material of the second connecting part 6 is ceramic PTC thermistor or organic PTC thermistor.

[0096] As shown in FIG. 5, the present embodiment further discloses a battery comprising the above-mentioned battery secondary short circuit prevention structure, and the first pole output 1 is a cover plate or a shell. That is, in some embodiments, the battery can be a cylindrical battery as shown in the figure, the first pole output 1 is a shell, and the battery cell 200 is arranged in the shell. In other embodiments, the battery can also be a square battery, and the first pole output 1 is a cover plate in communication with the second pole 2. Optionally, the second pole 2 is a positive pole, and the first pole output 1 is a negative output, or the second pole 2 is a negative pole, and the first pole output 1 is a positive output.

[0097] The battery can ensure insulation between the outer connecting portion 22 of the second pole post 2 and the first pole output 1, that is, even if the thermal runaway sealing ring 31 melts, it can still help to prevent short circuit between the second pole post 2 and the first pole output 1, that is, to avoid the greater danger and loss caused by short circuit between the positive output and the negative output.

[0098] Embodiment two

[0099] As shown in FIGS. 6-8, the battery secondary short circuit prevention structure of the embodiment includes a first pole output 1, a second pole post 2, an insulation sealing assembly 3, and a heat-resistant insulation structure. The difference between this embodiment and other embodiments is that the heat-resistant insulation structure is different.

[0100] In this embodiment, the heat-resistant insulation structure includes a heat-resistant insulation piece. The second pole post 2 includes an inner connecting portion 23 and a middle connecting portion 21 arranged in sequence along the axial direction of the second pole post 2, the middle connecting portion 21 is partially inserted into the first through hole 101 of the first pole output 1, and the inner connecting portion 23 protrudes radially along the axial direction of the second pole post 2 beyond the first through hole 101, that is, the size of the inner connecting portion 23 is greater than the size of the first through hole 101. The insulation sealing assembly 3 includes an inner insulation ring 32, the inner insulation ring 32 is sleeved on the middle connecting portion 21, and the annular portion 321 of the inner insulation ring 32 is clamped between the end face of the inner connecting portion 23 away from the inside of the battery and the end face of the first pole output 1 facing the inside of the battery. The heat-resistant insulation piece includes a second heat-resistant insulation ring 412, the second heat-resistant insulation ring 412 is sleeved on the middle connecting portion 21, and the second heat-resistant insulation ring 412 is clamped between the annular portion 321 and the end face of the inner connecting portion 23 away from the inside of the battery, or the second heat-resistant insulation ring 412 is clamped between the annular portion 321 and the end face of the first pole output 1 facing the inside of the battery. The material of the second heat-resistant insulation ring 412 is organic PTC thermistor, ceramic or mica, so that the second heat-resistant insulation ring 412 has insulation effect when the battery is in thermal runaway.

[0101] Even if the inner insulation ring 32 melts and fails at high temperature when the battery is in thermal runaway, the second heat-resistant insulation ring 412 can still have insulation effect, which can ensure insulation between the inner connecting portion 23 of the second pole post 2 and the first pole output 1, and help to prevent short circuit between the second pole post 2 and the first pole output 1, thereby avoiding greater danger and loss caused by short circuit between the positive output and the negative output.

[0102] Optionally, the material of the second heat-resistant insulation ring 412 is ceramic PTC thermistor or organic PTC thermistor, and the ceramic PTC thermistor belongs to a kind of ceramic materials. PTC thermistor is a typical temperature-sensitive semiconductor resistor, and its resistance value increases step by step with the increase of temperature when the temperature exceeds a certain value. At high temperature in thermal runaway, the resistance value of PTC thermistor increases, that is, it can play an insulation role to prevent the positive and negative outputs of the battery where the second heat-resistant insulation ring 412 is located from being short-circuited.

[0103] Optionally, the material of the second heat-resistant insulating ring 412 can also be other ceramic materials in addition to the ceramic PTC thermistor, which generally has insulating properties.

[0104] Optionally, the material of the second heat-resistant insulating ring 412 can also be mica or composite mica, i.e., a composite material containing mica components, which can withstand heat and has good insulating performance at high heat runaway temperatures.

[0105] As shown in FIG. 7, optionally, the second heat-resistant insulating ring 412 is clamped between the annular portion 321 and the end surface of the inner connecting portion 23 facing away from the inside of the battery, the inner side edge of the second heat-resistant insulating ring 412 abuts the middle connecting portion 21, preventing the inner connecting portion 23 from deforming at high temperatures, and contacting the first pole output 1 through the inner hole of the second heat-resistant insulating ring 412.

[0106] Optionally, the second heat-resistant insulating ring 412 is clamped between the annular portion 321 and the end surface of the inner connecting portion 23 facing away from the inside of the battery, the outer side edge of the second heat-resistant insulating ring 412 is flush with the outer side edge of the inner connecting portion 23, or the outer side edge of the second heat-resistant insulating ring 412 protrudes radially along itself beyond the outer side edge of the inner connecting portion 23, preventing the inner connecting portion 23 from deforming at high temperatures, and contacting the first pole output 1 through the outside of the outer side edge of the second heat-resistant insulating ring 412.

[0107] As shown in FIG. 8, optionally, the second heat-resistant insulating ring 412 is clamped between the annular portion 321 and the end surface of the first pole output 1 facing the inside of the battery, the inner insulating ring 32 further includes a tubular portion 322 connected to the annular portion 321, the tubular portion 322 is sleeved on the middle connecting portion 21, the inner side edge of the second heat-resistant insulating ring 412 abuts the tubular portion 322, preventing the periphery of the first through hole 101 of the first pole output 1 from deforming at high temperatures, and contacting the second pole post 2 through the inner hole of the second heat-resistant insulating ring 412.

[0108] Optionally, the second heat-resistant insulating ring 412 is clamped between the annular portion 321 and the end surface of the first pole output 1 facing the inside of the battery, the outer side edge of the second heat-resistant insulating ring 412 is flush with the outer side edge of the inner connecting portion 23, or the outer side edge of the second heat-resistant insulating ring 412 protrudes radially along itself beyond the outer side edge of the inner connecting portion 23, preventing the periphery of the first through hole 101 of the first pole output 1 from deforming at high temperatures, and contacting the inner connecting portion 23 through the outside of the outer side edge of the second heat-resistant insulating ring 412.

[0109] Optionally, the second heat-resistant insulation ring 412 comprises a fourth insulation ring 4121 and a fifth insulation ring 4122, the fourth insulation ring 4121 is clamped between the annular portion 321 and the end surface of the inner connecting portion 23 away from the battery interior, and the fifth insulation ring 4122 is clamped between the annular portion 321 and the end surface of the first pole output 1 facing the battery interior, and the fourth insulation ring 4121 and the fifth insulation ring 4122 are separately arranged or integrally formed.

[0110] Optionally, in some embodiments, only the fourth insulation ring 4121 is arranged, in some other embodiments, only the fifth insulation ring 4122 is arranged, and in some other embodiments, both the fourth insulation ring 4121 and the fifth insulation ring 4122 are arranged, and they are separately arranged, and in some other embodiments, both the fourth insulation ring 4121 and the fifth insulation ring 4122 are arranged, and they are optionally integrally formed.

[0111] Optionally, in the embodiment in which the fourth insulation ring 4121 and the fifth insulation ring 4122 are integrally formed, the second heat-resistant insulation ring 412 further comprises a third connecting portion 4123, the third connecting portion 4123 is arranged to connect the fourth insulation ring 4121 and the fifth insulation ring 4122, and the third connecting portion 4123, the fourth insulation ring 4121 and the fifth insulation ring 4122 are integrally formed.

[0112] Optionally, the third connecting portion 4123 is an annular connecting portion, one end of the annular connecting portion is connected to the fourth insulation ring 4121 along the axial direction, and the other end of the annular connecting portion is connected to the fifth insulation ring 4122, that is, the annular connecting portion is sleeved at the outer side wall surface of the annular portion 321 of the inner insulation ring 32. It can be known that the integrally formed arrangement mode can provide a certain spacing space when the thermal runaway inner insulation ring 32 melts, and further ensure the spaced insulation arrangement between the inner connecting portion 23 and the first pole output 1.

[0113] Optionally, the material of the annular connecting portion is organic PTC thermistor, ceramic or mica, so that the annular connecting portion has an insulation effect when the battery is in thermal runaway. Optionally, the material of the annular connecting portion is ceramic PTC thermistor or organic PTC thermistor.

[0114] Optionally, the second pole post 2 further comprises an outer connecting portion 22, the outer connecting portion 22 is connected to one end of the middle connecting portion 21 away from the battery interior, and the outer connecting portion 22 protrudes the first through hole 101 along the radial direction of the outer connecting portion 22.

[0115] Optionally, the battery secondary short circuit prevention structure further comprises a sealing ring 31, the sealing ring 31 is sleeved on the middle connecting portion 21, and the sealing ring 31 is clamped between the end surface of the outer connecting portion 22 facing the battery interior and the end surface of the first pole output 1 away from the battery interior, so as to ensure the insulation arrangement between the second pole post 2 and the end surface of the first pole output 1 away from the battery interior, and to block the gap between the middle connecting portion 21 and the side wall of the first through hole 101.

[0116] Optionally, the battery secondary short circuit prevention structure further comprises an outer insulation ring 33, the outer insulation ring 33 is partially sleeved on the outer connecting portion 22 and partially clamped between the end surface of the outer connecting portion 22 facing the battery interior and the end surface of the first pole output 1 facing away from the battery interior, so as to ensure that the end surface of the outer connecting portion 22 facing the battery interior and the end surface of the first pole output 1 facing away from the battery interior are insulated and spaced apart.

[0117] Optionally, the first pole output 1 comprises a cover plate and a shell, the second pole post 2 is inserted into the first through hole 101 of the cover plate, or the second pole post 2 is inserted into the first through hole 101 of the shell. That is, the first pole output 1 is a cover plate or a shell. When the first pole output 1 is a cover plate, the battery secondary short circuit prevention structure can be used to manufacture a square battery, and when the first pole output 1 is a shell, the battery secondary short circuit prevention structure can be used to manufacture a cylindrical battery.

[0118] The embodiment also provides a battery comprising the above-mentioned battery secondary short circuit prevention structure, and the first pole output 1 is a shell or a cover plate. That is, in some embodiments, the battery can be a cylindrical battery as shown in FIG. 9, the first pole output 1 is a shell, and the battery cell 200 is arranged in the shell. In other embodiments, the battery can also be a square battery, and the first pole output 1 is a cover plate in electrical connection with the second pole post 2. Optionally, the second pole post 2 is a positive pole post, and the first pole output 1 is a negative pole output, or the second pole post 2 is a negative pole post, and the first pole output 1 is a positive pole output.

[0119] The battery can ensure insulation between the inner connecting portion 23 of the second pole post 2 and the first pole output 1, which helps to prevent short circuit between the second pole post 2 and the first pole output 1, that is, to avoid greater danger and loss caused by short circuit between the positive pole output and the negative pole output.

[0120] Embodiment Three

[0121] As shown in FIGS. 10-11, the battery secondary short circuit prevention structure of the embodiment comprises a first pole output 1, a second pole post 2, an insulation sealing assembly 3, and a heat-resistant insulation structure. The difference between the embodiment and other embodiments is that the heat-resistant insulation structure is different.

[0122] In the embodiment, the heat-resistant insulation structure comprises a heat-resistant insulation piece. The first through hole 101 is arranged on the first pole output 1, and the second pole post 2 comprises a middle connecting portion 21 which is partially inserted into the first through hole 101. The insulation sealing assembly 3 is sleeved on the middle connecting portion 21 and is partially clamped between the middle connecting portion 21 and the inner wall of the first through hole 101. The heat-resistant insulation piece comprises a first heat-resistant insulation tube 413 which is sleeved on the middle connecting portion 21 and is clamped between the middle connecting portion 21 and the insulation sealing assembly 3. The material of the first heat-resistant insulation tube 413 is organic PTC thermistor, ceramic or mica, so that the first heat-resistant insulation tube 413 has insulation effect when the battery is in thermal runaway.

[0123] When the battery is in thermal runaway, the insulation sealing assembly 3 will melt under high temperature and fail, but the first heat-resistant insulation tube 413 can still have insulation effect, which can ensure the insulation between the middle connecting portion 21 of the second pole post 2 and the inner wall of the first through hole 101 of the first pole output 1, and help to prevent the short circuit between the second pole post 2 and the first pole output 1, which can cause greater danger and loss, that is, the secondary short circuit prevention structure of the battery can help to avoid the short circuit between the positive output and the negative output when the battery is in thermal runaway.

[0124] Optionally, the material of the first heat-resistant insulation tube 413 is ceramic PTC thermistor or organic PTC thermistor. The ceramic PTC thermistor belongs to a kind of ceramic materials. The PTC thermistor is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain value, the resistance value of the PTC thermistor will increase with the increase of the temperature in a step manner. Under high temperature of thermal runaway, the resistance value of the PTC thermistor increases, that is, the first heat-resistant insulation tube 413 can play an insulation role to prevent the short circuit between the positive output and the negative output of the battery at the position of the first heat-resistant insulation tube 413.

[0125] Optionally, the material of the first heat-resistant insulation tube 413 can also be other ceramic materials in addition to ceramic PTC thermistor. Ceramic materials generally have insulation properties.

[0126] Optionally, the material of the first heat-resistant insulation tube 413 can also be mica or composite mica. The composite mica is a composite material containing mica components, which can withstand heat and has good insulation performance under high temperature of thermal runaway.

[0127] Optionally, the second pole post 2 further comprises an inner connecting portion 23 which is connected to one end of the middle connecting portion 21 close to the inside of the battery. The inner connecting portion 23 protrudes from the middle connecting portion 21 along the radial direction of the inner connecting portion 23. One end of the first heat-resistant insulation tube 413 abuts against the end face of the inner connecting portion 23 away from the inside of the battery, so as to prevent the second pole post 2 from moving in the axial and radial directions after the insulation sealing assembly 3 melts, and the middle connecting portion 21 close to the inner connecting portion 23 contacts the inner wall of the first through hole 101 to cause short circuit.

[0128] Optionally, the second pole post 2 further comprises an outer connecting portion 22 connected to one end of the middle connecting portion 21 away from the inside of the battery, the outer connecting portion 22 protrudes along the radial direction of the middle connecting portion 21, and the other end of the first heat-resistant insulation tube 413 abuts against the end face of the outer connecting portion 22 towards the inside of the battery, so as to prevent the second pole post 2 from moving in the axial and radial directions after the insulation sealing assembly 3 melts, and the middle connecting portion 21 close to the outer connecting portion 22 is in contact with the inner wall of the first through hole 101 to short circuit. The first heat-resistant insulation tube 413 wraps the entire middle connecting portion 21, which can prevent the middle connecting portion 21 from being in contact with the inner wall of the first through hole 101 to short circuit, thereby ensuring the protection effect.

[0129] Optionally, the insulation sealing assembly 3 comprises a first ring, which is a part of the inner insulation ring 32 in the insulation sealing assembly 3 in this embodiment, i.e. the annular portion 321. The first ring is clamped between the end face of the inner connecting portion 23 away from the inside of the battery and the end face of the first pole output 1 towards the inside of the battery. As shown in FIG. 12, the heat-resistant insulation member further comprises a third heat-resistant insulation ring 414 clamped between the end face of the inner connecting portion 23 away from the inside of the battery and the first ring, or clamped between the first ring and the end face of the first pole output 1 towards the inside of the battery (not shown in the figure), and the third heat-resistant insulation ring 414 is made of organic PTC thermistor, ceramic or mica, so that the third heat-resistant insulation ring 414 has insulation effect when the battery is in thermal runaway. The setting of the third heat-resistant insulation ring 414 can ensure the insulation between the end face of the inner connecting portion 23 away from the inside of the battery and the end face of the first pole output 1 towards the inside of the battery when the first ring melts.

[0130] Similarly, optionally, the third heat-resistant insulation ring 414 is made of ceramic PTC thermistor or organic PTC thermistor, and the ceramic PTC thermistor belongs to a kind of ceramic materials. PTC thermistor is a typical semiconductor resistance with temperature sensitivity, and its resistance value increases step by step with the increase of temperature when the temperature exceeds a certain value. At high temperature in thermal runaway, the resistance value of the PTC thermistor increases, i.e. it can play an insulation role to prevent the positive output and the negative output of the battery at the position of the third heat-resistant insulation ring 414 from short circuiting.

[0131] Optionally, the third heat-resistant insulation ring 414 can also be made of other ceramic materials in addition to ceramic PTC thermistor, and ceramic materials generally have insulation properties.

[0132] Optionally, the third heat-resistant insulation ring 414 can also be made of mica or composite mica, and the composite mica is a composite material containing mica components, which can withstand heat and has good insulation performance at high temperature in thermal runaway.

[0133] Optionally, when the third heat-resistant insulation ring 414 is clamped between the end surface of the inner connecting part 23 facing away from the battery interior and the first ring, the inner circle of the third heat-resistant insulation ring 414 abuts the middle connecting part 21, and the outer circle edge is flush with the edge of the inner connecting part 23 or the outer circle edge of the third heat-resistant insulation ring 414 protrudes from the edge of the inner connecting part 23. When the third heat-resistant insulation ring 414 is clamped between the first ring and the end surface of the first pole output 1 facing the battery interior, the inner circle of the third heat-resistant insulation ring 414 abuts the insulation sealing assembly 3, and the outer circle edge is flush with the edge of the inner connecting part 23 or the outer circle edge of the third heat-resistant insulation ring 414 protrudes from the edge of the inner connecting part 23, so as to ensure that the inner connecting part 23 cannot contact the first pole output 1 from the inner hole or the outer side of the third heat-resistant insulation ring 414.

[0134] In some embodiments, the first heat-resistant insulation tube 413 can be provided separately, in other embodiments, the first heat-resistant insulation tube 413 and the third heat-resistant insulation ring 414 can be provided simultaneously, and the two are provided separately, in yet other embodiments, the first heat-resistant insulation tube 413 and the third heat-resistant insulation ring 414 can be provided simultaneously, and the two are connected.

[0135] Optionally, when the third heat-resistant insulation ring 414 is clamped between the end surface of the inner connecting part 23 facing away from the battery interior and the first ring, the third heat-resistant insulation ring 414 and the first heat-resistant insulation tube 413 have an L-shaped cross section as a whole, which can prevent the third heat-resistant insulation ring 414 from moving in the axial direction of the middle connecting part 21. When the third heat-resistant insulation ring 414 is clamped between the first ring and the end surface of the first pole output 1 facing the battery interior, the third heat-resistant insulation ring 414 passes through the insulation sealing assembly 3 and the first heat-resistant insulation tube 413, and the abutting gap of the insulation sealing assembly 3 can be provided at this position, so that the third heat-resistant insulation ring 414 is partially clamped at the abutting gap. The third heat-resistant insulation ring 414 and the first heat-resistant insulation tube 413 have a T-shaped cross section as a whole, which can also prevent the third heat-resistant insulation ring 414 from changing position in the axial direction of the middle connecting part 21.

[0136] Optionally, the insulation sealing assembly 3 comprises a second ring, which is the sealing ring 31 in the embodiment. The second ring is clamped between the end face of the outer connecting portion 22 facing the inside of the battery and the end face of the first pole output 1 facing away from the inside of the battery. The heat-resistant insulation member further comprises a fourth heat-resistant insulation ring 415 clamped between the end face of the outer connecting portion 22 facing the inside of the battery and the second ring, or clamped between the second ring and the end face of the first pole output 1 facing away from the inside of the battery. The fourth heat-resistant insulation ring 415 is made of organic PTC thermistor, ceramic or mica, so that the fourth heat-resistant insulation ring 415 has insulation effect when the battery is in thermal runaway. When the second ring melts in thermal runaway, the setting of the fourth heat-resistant insulation ring 415 can ensure the insulation between the end face of the outer connecting portion 22 facing the inside of the battery and the end face of the first pole output 1 facing away from the inside of the battery.

[0137] Similarly, optionally, the fourth heat-resistant insulation ring 415 is made of ceramic PTC thermistor or organic PTC thermistor. The ceramic PTC thermistor belongs to a kind of ceramic materials. The PTC thermistor is a typical temperature-sensitive semiconductor resistor. When the temperature exceeds a certain value, the resistance value of the PTC thermistor increases with the increase of the temperature in a step manner. At high temperature in thermal runaway, the resistance value of the PTC thermistor increases, which can play an insulation role to prevent the positive output and the negative output of the battery at the position of the fourth heat-resistant insulation ring 415 from being short-circuited.

[0138] Optionally, the fourth heat-resistant insulation ring 415 can also be made of other ceramic materials in addition to ceramic PTC thermistor. Ceramic materials generally have insulation properties.

[0139] Optionally, the fourth heat-resistant insulation ring 415 can also be made of mica or composite mica. The composite mica is a composite material containing mica components, which can withstand heat and has good insulation performance at high temperature in thermal runaway.

[0140] Optionally, when the fourth heat-resistant insulation ring 415 is clamped between the end face of the outer connecting portion 22 facing the inside of the battery and the second ring, the inner circle of the fourth heat-resistant insulation ring 415 abuts against the middle connecting portion 21, and the outer circle edge is flush with the edge of the outer connecting portion 22 or the outer circle edge of the fourth heat-resistant insulation ring 415 protrudes beyond the edge of the outer connecting portion 22. When the fourth heat-resistant insulation ring 415 is clamped between the second ring and the end face of the first pole output 1 facing away from the inside of the battery, the inner circle of the fourth heat-resistant insulation ring 415 abuts against the middle connecting portion 21 through the butt joint gap between the insulation sealing assembly 3, and the outer circle edge is flush with the edge of the outer connecting portion 22 or the outer circle edge of the fourth heat-resistant insulation ring 415 protrudes beyond the edge of the outer connecting portion 22, so as to ensure that the outer connecting portion 22 cannot contact the first pole output 1 through the inner hole or the outer side of the fourth heat-resistant insulation ring 415.

[0141] In some embodiments, the first heat-resistant insulation tube 413 can be provided alone, in other embodiments, the first heat-resistant insulation tube 413 and the fourth heat-resistant insulation ring 415 can be provided simultaneously and separately, and in yet other embodiments, the first heat-resistant insulation tube 413 and the fourth heat-resistant insulation ring 415 can be provided simultaneously and connected. Optionally, the inner ring of the fourth heat-resistant insulation ring 415 is connected to the outer wall of the first heat-resistant insulation tube 413.

[0142] Optionally, when the fourth heat-resistant insulation ring 415 is clamped between the end surface of the outer connecting portion 22 facing the inside of the battery and the second ring, the cross section of the fourth heat-resistant insulation ring 415 and the first heat-resistant insulation tube 413 as a whole is L-shaped, which can prevent the fourth heat-resistant insulation ring 415 from moving in the axial direction of the middle connecting portion 21. When the fourth heat-resistant insulation ring 415 is clamped between the second ring and the end surface of the first pole output 1 away from the inside of the battery, the fourth heat-resistant insulation ring 415 passes through the insulation sealing assembly 3 and the first heat-resistant insulation tube 413, and the abutting gap of the insulation sealing assembly 3 can be provided at this position, so that the fourth heat-resistant insulation ring 415 is partially clamped at the abutting gap. The cross section of the fourth heat-resistant insulation ring 415 and the first heat-resistant insulation tube 413 as a whole is similar to T-shaped, which can also prevent the position of the fourth heat-resistant insulation ring 415 in the axial direction of the middle connecting portion 21 from changing.

[0143] Optionally, in yet other embodiments, the first heat-resistant insulation tube 413, the third heat-resistant insulation ring 414 and the fourth heat-resistant insulation ring 415 can be provided simultaneously and separately, or one is separate and the other two are connected. In yet other embodiments, the first heat-resistant insulation tube 413, the third heat-resistant insulation ring 414 and the fourth heat-resistant insulation ring 415 can be provided simultaneously and connected. That is, as shown in FIG. 12, the inner ring of the third heat-resistant insulation ring 414 and the fourth heat-resistant insulation ring 415 are both connected to the outer wall of the first heat-resistant insulation tube 413. According to the different positions provided, the cross section of the first heat-resistant insulation tube 413, the third heat-resistant insulation ring 414 and the fourth heat-resistant insulation ring 415 as a whole can be similar to C-shaped, F-shaped or horizontally placed π-shaped.

[0144] Optionally, the battery secondary short circuit prevention structure further comprises a second heat-resistant insulation tube 416, which is sleeved on the outside of the insulation sealing assembly 3 and clamped between the insulation sealing assembly 3 and the inner wall of the first through hole 101. The second heat-resistant insulation tube 416 can further prevent short circuit between the middle connecting portion 21 and the inner wall of the first through hole 101.

[0145] Optionally, the material of the second heat-resistant insulation tube 416 is organic PTC thermistor, ceramic or mica, so that the second heat-resistant insulation tube 416 still has insulation effect when the battery is in thermal runaway. Optionally, the material of the second heat-resistant insulation tube 416 is ceramic PTC thermistor or organic PTC thermistor, which can prevent the positive output and the negative output of the battery at the position of the second heat-resistant insulation tube 416 from being short-circuited.

[0146] Optionally, the material of the second heat-resistant insulation tube 416 can also be other ceramic materials in addition to ceramic PTC thermistor, which generally has insulation characteristics.

[0147] Optionally, the material of the second heat-resistant insulation tube 416 can also be mica or composite mica, which is a composite material containing mica components, can withstand heat and has good insulation performance at high temperature in thermal runaway.

[0148] Optionally, the insulation sealing assembly 3 includes an inner insulation ring 32 and a sealing ring 31 arranged in sequence along the axial direction of the second pole post 2. In this embodiment, the first ring is part of the inner insulation ring 32, and the sealing ring 31 is the second ring. The battery secondary short circuit prevention structure further includes a support connecting ring 417, which is clamped between the inner insulation ring 32 and the sealing ring 31, i.e. the support connecting ring 417 is clamped at the abutting gap of the inner insulation ring 32 and the sealing ring 31. The inner ring of the support connecting ring 417 is connected to the first heat-resistant insulation tube 413, and the outer ring of the support connecting ring is connected to the second heat-resistant insulation tube 416. The support connecting ring 417 can fix the relative position of the first heat-resistant insulation tube 413 and the second heat-resistant insulation tube 416, and ensure that they are located at the concentric position.

[0149] Optionally, the material of the support connecting ring 417 is organic PTC thermistor, ceramic or mica, so that the support connecting ring 417 still has insulation effect when the battery is in thermal runaway. Optionally, the material of the support connecting ring 417 is ceramic PTC thermistor or organic PTC thermistor, which can prevent the positive output and the negative output of the battery at the position of the support connecting ring 417 from being short-circuited.

[0150] Optionally, the material of the support connecting ring 417 can also be other ceramic materials in addition to ceramic PTC thermistor, which generally has insulation characteristics.

[0151] Optionally, the material of the support connecting ring 417 can also be mica or composite mica, which is a composite material containing mica components, can withstand heat and has good insulation performance at high temperature in thermal runaway.

[0152] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole post 2 is inserted into the first through hole 101 of the cover plate or the first through hole 101 of the shell. That is, the first pole output 1 is the cover plate or the shell. When the first pole output 1 is the cover plate, the battery secondary short circuit prevention structure can be used to manufacture a square battery, and when the first pole output 1 is the shell, the battery secondary short circuit prevention structure can be used to manufacture a cylindrical battery.

[0153] The embodiment also provides a battery comprising the battery secondary short circuit prevention structure. Optionally, in the embodiment, the first pole output 1 is the shell or the cover plate. In the embodiment, when the battery is a cylindrical battery as shown in FIG. 13, the first pole output 1 is the shell, and the battery cell 200 is arranged in the shell. In other embodiments, the battery can also be a square battery, and the first pole output 1 is the cover plate which is in electrical connection with the second pole post 2. Optionally, the second pole post 2 is the positive pole post, and the first pole output 1 is the negative pole output, or the second pole post 2 is the negative pole post, and the first pole output 1 is the positive pole output.

[0154] The battery can ensure insulation between the middle connecting portion 21 of the second pole post 2 and the inner wall of the first through hole 101 of the first pole output 1, that is, even if the insulation sealing assembly 3 melts when thermal runaway occurs, the arrangement of the first heat-resistant insulation tube 413 can still help prevent short circuit between the second pole post 2 and the first pole output 1, that is, help avoid greater danger and loss caused by short circuit between the positive pole output and the negative pole output.

[0155] Embodiment Four

[0156] As shown in FIGS. 14-18, the battery secondary short circuit prevention structure of the embodiment comprises a first pole output 1, a second pole post 2, an insulation sealing assembly 3, and a heat-resistant insulation structure. The difference between the embodiment and other embodiments is that the heat-resistant insulation structure is different.

[0157] In the embodiment, the heat-resistant insulation structure comprises a heat-resistant insulation layer 42, and the second pole post 2 and the first pole output 1 are riveted. The first pole output 1 is provided with a first through hole 101, the second pole post 2 is riveted to the first through hole 101, the insulation sealing assembly 3 is at least partially arranged between the heat-resistant insulation layer 42 and the first pole output 1, and the heat-resistant insulation layer 42 is arranged on the side wall of the second pole post 2. By arranging the heat-resistant insulation layer 42 on the side wall of the second pole post 2, insulation between the second pole post 2 and the first through hole 101 of the first pole output 1 can still be ensured when the insulation sealing assembly 3 melts at high temperature, that is, it can help prevent secondary short circuit and improve safety.

[0158] Optionally, the heat-resistant insulation layer 42 is an electroplated aluminum oxide layer. Aluminum oxide has good insulation properties and can withstand high temperatures, and the electroplated aluminum oxide layer can ensure structural strength and connection strength.

[0159] As shown in FIG. 18, optionally, the second-pole post 2 comprises an inner connecting portion 23 located inside the battery, an end face of the inner connecting portion 23 is electrically connected with the tab of the battery cell 200, and the heat-resistant insulating layer 42 comprises a first heat-resistant insulating layer 421 located on the end face of the inner connecting portion 23 facing away from the inside of the battery, so that when the insulating sealing assembly 3 is melted, the end face of the inner connecting portion 23 facing away from the inside of the battery and the wall face of the first-pole output 1 facing the inside of the battery can still be insulated. Optionally, the first heat-resistant insulating layer 421 is located on the side wall of the inner connecting portion 23, so as to ensure that the side face of the inner connecting portion 23 does not contact and short-circuit with the first-pole output 1. In this embodiment, the end face of the inner connecting portion 23 facing away from the inside of the battery and the side wall of the inner connecting portion 23 are both provided with the first heat-resistant insulating layer 421. Of course, in other embodiments, the first heat-resistant insulating layer 421 can be provided only on the end face of the inner connecting portion 23 facing away from the inside of the battery, or only on the side wall of the inner connecting portion 23, which can both help prevent secondary short-circuit.

[0160] Optionally, the second-pole post 2 comprises a middle connecting portion 21 inserted into the first through hole 101, and the heat-resistant insulating layer 42 comprises a second heat-resistant insulating layer 422 located on the side wall of the middle connecting portion 21, so as to prevent the middle connecting portion 21 from contacting and short-circuiting with the side wall of the first through hole 101 when the insulating sealing assembly 3 is melted at high temperature. It can be known that at high temperature, the insulating sealing assembly 3 may be partially melted, or the position of the second-pole post 2 relative to the first-pole output 1 may change, which increases the risk of secondary short-circuit.

[0161] Optionally, the second-pole post 2 comprises an outer connecting portion 22 located outside the battery, and an end face of the outer connecting portion 22 is used for electrical connection with the outside. Optionally, the inner connecting portion 23, the middle connecting portion 21 and the outer connecting portion 22 are sequentially connected along the axial direction of the second-pole post 2, and the diameter of the inner connecting portion 23 is greater than the diameter of the middle connecting portion 21, and the diameter of the outer connecting portion 22 is greater than the diameter of the middle connecting portion 21, so as to ensure that the second-pole post 2 does not come off the first through hole 101 of the first-pole output 1. Optionally, the inner connecting portion 23 is a riveting deformation portion, or the outer connecting portion 22 is a riveting deformation portion, which is not limited herein. The riveting manner can ensure the close connection between the second-pole post 2 and the first-pole output 1, and prevent relative displacement therebetween. It can be known that the heat-resistant insulating layer 42 needs to be electroplated on the outer wall of the second-pole post 2 first, and then the second-pole post 2 is riveted on the first-pole output 1.

[0162] The heat-resistant insulation layer 42 comprises a third heat-resistant insulation layer 423 located on the end surface of the outer connecting part 22 facing the inside of the battery, so as to prevent the short circuit between the end surface of the outer connecting part 22 facing the inside of the battery and the wall surface of the first pole output 1 facing the inside of the battery. Since the first pole output 1 may be deformed at high temperature, the third heat-resistant insulation layer 423 is optionally located on the side wall of the outer connecting part 22, so as to prevent the short circuit between the side wall of the outer connecting part 22 and the deformed first pole output 1. In the embodiment, the third heat-resistant insulation layer 423 is arranged on the end surface of the outer connecting part 22 facing the inside of the battery and the side wall of the outer connecting part 22. Of course, in other embodiments, the third heat-resistant insulation layer 423 can be arranged only on the end surface of the outer connecting part 22 facing the inside of the battery or only on the side wall of the outer connecting part 22, which can help to prevent secondary short circuit.

[0163] As shown in FIG. 15 and FIG. 18, the insulation sealing assembly 3 optionally comprises an inner insulation ring 32 sleeved on the middle connecting part 21, and the inner insulation ring 32 comprises an annular part 321 clamped between the end surface of the inner connecting part 23 facing away from the inside of the battery and the wall surface of the first pole output 1 facing the inside of the battery, so as to ensure the insulation between the second pole post 2 and the first pole output 1 at this position.

[0164] The inner insulation ring 32 optionally further comprises a tubular part 322 clamped between the side wall of the middle connecting part 21 and the inner wall of the first through hole 101, so as to ensure the insulation between the second pole post 2 and the first pole output 1 at this position, and help to fix the position of the second pole post 2 relative to the first through hole 101 in the radial direction. When the material of the inner insulation ring 32 has a certain elasticity, the inner insulation ring 32 is clamped with an interference between the second pole post 2 and the first pole output 1, which can have a certain sealing function.

[0165] The insulation sealing assembly 3 optionally further comprises a sealing ring 31 and an outer insulation ring 33. The sealing ring 31 is sleeved on the middle connecting part 21, and the sealing ring 31 is clamped between the end surface of the outer connecting part 22 facing the inside of the battery and the wall surface of the first pole output 1 facing away from the inside of the battery. On the one hand, the sealing ring 31 can block the gap between the middle connecting part 21 and the inner wall of the first through hole 101, and on the other hand, the sealing ring 31 can ensure the spaced insulation state between the second pole post 2 and the first pole output 1 at this position.

[0166] Optionally, the outer insulation ring 33 is partially clamped between the end surface of the outer connecting portion 22 facing the inside of the battery and the wall surface of the first pole output 1 facing away from the inside of the battery, to prevent short circuit between the end surface of the outer connecting portion 22 facing the inside of the battery and the wall surface of the first pole output 1 facing away from the inside of the battery, and the part of the outer insulation ring 33 is annular structure. The outer insulation ring 33 further comprises a tubular structure connected to the outer ring of the annular structure and extending towards the outside of the battery, to have a certain wrapping spacing effect on the outer connecting portion 22 of the second pole post 2.

[0167] Optionally, the thickness of the heat-resistant insulation layer 42 is greater than 0.01 mm, to ensure its insulation performance. Of course, the value of the thickness also needs to be considered comprehensively in terms of cost and space occupation.

[0168] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole post 2 is riveted at the first through hole 101 of the cover plate, or the second pole post 2 is riveted at the first through hole 101 of the shell. In the embodiment, the second pole post 2 is riveted at the first through hole 101 of the shell, the shell is a steel shell, and the shell is in conductive connection with the negative electrode, and the second pole post 2 is in conductive connection with the positive electrode tab of the battery cell 200. Of course, in other embodiments, the shell can be in conductive connection with the positive electrode, and the second pole post 2 is a negative pole post. In other embodiments, the second pole post 2 can also be riveted at the first through hole 101 of the cover plate. In other embodiments, the heat-resistant insulation layer 42 can also be provided on the positive pole post and the negative pole post, or only on the positive pole post, or only on the negative pole post.

[0169] The embodiment also provides a battery comprising the battery secondary short circuit prevention structure and the battery cell 200, and the battery cell 200 is located in the first pole output 1. In the embodiment, the battery is a cylindrical battery, and of course, in other embodiments, it can also be a square battery. The battery can help to prevent secondary short circuit and improve safety.

[0170] Embodiment five

[0171] As shown in FIGS. 19-23, the battery secondary short circuit prevention structure of the embodiment comprises a first pole output 1, a second pole post 2, an insulation sealing assembly 3 and a heat-resistant insulation structure. The difference between the embodiment and other embodiments is that the heat-resistant insulation structure is different.

[0172] In the embodiment, the heat-resistant insulation structure includes the heat-resistant insulation layer 42, and the second pole post 2 and the first pole output 1 are glued together. The first pole output 1 is provided with a first through hole 101, and the second pole post 2 includes an insertion part 24 and an inner connecting part 23 connected along the axial direction of the second pole post 2, the insertion part 24 is inserted into the first through hole 101, and the side wall of the insertion part 24 is annularly provided with a first positioning groove 241 along the axial direction of the insertion part 24, and the inner connecting part 23 is located on the end face of the first pole output 1 facing the inside of the battery, i.e., the first side of the first pole output 1. The insulation sealing assembly 3 includes an outer insulation ring 33, the outer insulation ring 33 is formed by gluing process, the outer insulation ring 33 is partially inserted into the first positioning groove 241, partially covers the end face of the first pole output 1 away from the inside of the battery, i.e., the second side of the first pole output 1, and partially clamps between the side wall of the insertion part 24 and the inner wall of the first through hole 101. Optionally, the insertion part 24 is cylindrical, the first through hole 101 is circular, the diameter of the insertion part 24 is smaller than the diameter of the first through hole 101, and the end of the insertion part 24 is glued and fixed on the first side of the first pole output 1 by the outer insulation ring 33. The heat-resistant insulation layer 42 includes a fourth heat-resistant insulation layer and / or a fifth heat-resistant insulation layer, the fourth heat-resistant insulation layer is arranged on the side wall of the second pole post 2, and the fifth heat-resistant insulation layer is arranged on the surface of the first pole output 1 facing the second pole post 2.

[0173] When the battery is in thermal runaway and the internal temperature is very high, the outer insulation ring 33 may be melted and failed, but the fourth heat-resistant insulation layer and / or the fifth heat-resistant insulation layer can help prevent the second pole post 2 from contacting the first pole output 1 to prevent secondary short circuit and improve safety.

[0174] As shown in FIG. 22, optionally, the fourth heat-resistant insulation layer includes a first area heat-resistant insulation layer 4241 arranged on the side wall of the insertion part 24 to prevent the side wall of the insertion part 24 from contacting the first pole output 1 in a high temperature environment to cause secondary short circuit. The groove bottom and the side wall of the first positioning groove 241 are both provided with the heat-resistant insulation layer 42, and the side wall of the insertion part 24 on both sides of the first positioning groove 241 is also provided with the heat-resistant insulation layer 42 along the axial direction of the second pole post 2.

[0175] Optionally, the upper edge of the side wall of the first positioning groove 241 close to the inner connecting part 23 is provided with a chamfer, and the chamfer surface is also provided with the heat-resistant insulation layer 42.

[0176] Optionally, along the first direction, the maximum size of the inner connecting part 23 is greater than the maximum size of the first through hole 101, the first direction is perpendicular to the axial direction of the second pole post 2, the fourth heat-resistant insulation layer includes a second area heat-resistant insulation layer 4242 arranged on the first end face 211 of the inner connecting part 23 facing the insertion part 24 to prevent the first end face 211 of the inner connecting part 23 from contacting the first pole output 1 in a high temperature environment to cause secondary short circuit.

[0177] Optionally, the fourth heat-resistant insulation layer comprises a third-zone heat-resistant insulation layer 4243 located on the sidewall of the inner connecting part 23 to prevent the sidewall of the inner connecting part 23 from contacting the first-pole output 1 under a high-temperature environment, thereby causing secondary short circuit.

[0178] Optionally, the first-zone heat-resistant insulation layer 4241, the second-zone heat-resistant insulation layer 4242 and the third-zone heat-resistant insulation layer 4243 are sequentially connected without gap between adjacent zones to avoid the formation of secondary short circuit at the connection of the zones.

[0179] As shown in FIG. 23, optionally, the fifth heat-resistant insulation layer comprises a fourth-zone heat-resistant insulation layer 4251 located on the end surface of the first-pole output 1 facing away from the inside of the battery, i.e. the surface of the second side of the first-pole output 1 around the first through hole 101.

[0180] Further optionally, in order to prevent the outer insulation ring 33 from being displaced relative to the first-pole output 1 along the radial direction of the second-pole post 2, so that the relative position of the second-pole post 2 and the first-pole output 1 along the radial direction of the second-pole post 2 changes, a positioning ring 102 is protruded on the end surface of the first-pole output 1 facing away from the inside of the battery, the positioning ring 102 is located around the first through hole 101 and is inserted into the first positioning groove 331 of the outer insulation ring 33, so as to further fix the relative position between the second-pole post 2 and the first-pole output 1.

[0181] Optionally, the fourth-zone heat-resistant insulation layer 4251 is located on the end surface of the positioning ring 102 facing away from the first-pole output 1, i.e. the second end surface 1021, which protrudes from the end surface of the first-pole output 1 facing away from the inside of the battery, i.e. the surface of the second side of the first-pole output 1. When the outer insulation ring 33 fails due to melting under a high-temperature environment, the second-pole post 2 is likely to be tilted and contact the second end surface 1021, thereby causing secondary short circuit. The fourth-zone heat-resistant insulation layer 4251 arranged on the second end surface 1021 can prevent the second end surface 1021 from contacting the second-pole post 2.

[0182] Since the inner wall of the positioning ring 102 faces the second-pole post 2, the inner wall of the positioning ring 102 is also likely to contact the second-pole post 2 and cause short circuit when the second-pole post 2 is tilted or the first-pole output 1 is deformed, therefore, optionally, the fourth-zone heat-resistant insulation layer 4251 is arranged on the inner wall of the positioning ring 102.

[0183] Optionally, the fourth-zone heat-resistant insulation layer 4251 is arranged on the end surface of the first-pole output 1 facing away from the inside of the battery within the positioning ring 102. This part of the region is closer to the second-pole post 2 and is more likely to contact the second-pole post 2 and cause short circuit.

[0184] Optionally, the fifth heat-resistant insulation layer includes a fifth-zone heat-resistant insulation layer 4252, which is located on the inner wall of the first through hole 101 to prevent the inner wall of the first through hole 101 from contacting the second-pole pole 2 in a high-temperature environment, thereby causing secondary short circuit. Optionally, the edge of the first end of the first through hole 101 away from the inner connecting part 23 is provided with a chamfer, and the chamfer surface is also provided with a heat-resistant insulation layer 42 to prevent the chamfer surface from contacting the second-pole pole 2, thereby causing secondary short circuit.

[0185] Optionally, the fifth heat-resistant insulation layer includes a sixth-zone heat-resistant insulation layer 4253, which is located on the end surface of the first-pole output 1 facing the inside of the battery, i.e., the surface of the first side of the first-pole output 1.

[0186] Optionally, the end surface of the first-pole output 1 facing the inside of the battery is provided with a relief groove 1022, and the first through hole 101 is located at the groove bottom of the relief groove 1022. The relief groove 1022 is coaxially arranged with the inner connecting part 23, and the maximum size of the inner connecting part 23 is smaller than the maximum size of the groove bottom of the relief groove 1022 along the first direction, which is perpendicular to the axial direction of the second-pole pole 2. Therefore, the groove bottom and the side wall of the relief groove 1022 both face the inner connecting part 23. Optionally, the sixth-zone heat-resistant insulation layer 4253 is located at the groove bottom of the relief groove 1022 to prevent the groove bottom of the relief groove 1022 from contacting the inner connecting part 23, thereby causing secondary short circuit. Optionally, the sixth-zone heat-resistant insulation layer 4253 is located on the side wall of the relief groove 1022 to prevent the side wall of the relief groove 1022 from contacting the inner connecting part 23, thereby causing secondary short circuit.

[0187] Optionally, the opening edge of the relief groove 1022 is provided with a curved transition to prevent scratching the second-pole pole 2 or the battery cell 200. The transition curve is also provided with a heat-resistant insulation layer 42 to prevent the transition curve from contacting the second-pole pole 2, thereby causing secondary short circuit.

[0188] Optionally, the fourth-zone heat-resistant insulation layer 4251, the fifth-zone heat-resistant insulation layer 4252, and the sixth-zone heat-resistant insulation layer 4253 are sequentially connected without gaps between adjacent zones to avoid the formation of secondary short circuit at the connection of the zones.

[0189] In some embodiments, only the fourth heat-resistant insulation layer is provided on the second-pole pole 2, and the fifth heat-resistant insulation layer is not provided on the first-pole output 1. In other embodiments, only the fifth heat-resistant insulation layer is provided on the first-pole output 1, and the fourth heat-resistant insulation layer is not provided on the second-pole pole 2. In yet other embodiments, both the fourth heat-resistant insulation layer and the fifth heat-resistant insulation layer are provided on the second-pole pole 2 and the first-pole output 1, respectively.

[0190] Optionally, the fourth heat-resistant insulation layer has a thickness greater than 0.01 mm, and optionally, the fifth heat-resistant insulation layer has a thickness greater than 0.01 mm. If the thickness of the heat-resistant insulation layer 42 is too low, the insulation effect will be affected. The upper limit of the thickness depends on the space design of the battery, to balance the energy density and safety performance.

[0191] Optionally, the fourth heat-resistant insulation layer is an electroplated aluminum oxide layer, and optionally, the fifth heat-resistant insulation layer is an electroplated aluminum oxide layer. Aluminum oxide has good insulation properties and can withstand high temperatures. The electroplated aluminum oxide layer can ensure the structural strength and connection strength.

[0192] Optionally, the battery secondary short circuit prevention structure further comprises a sealing ring 31. The insulating sealing assembly 3 comprises the sealing ring 31. The sealing ring 31 is sleeved on the insertion portion 24. The sealing ring 31 is clamped between the first end surface 211 of the inner connecting portion 23 facing the insertion portion 24 and the first pole output 1, to block the gap between the first through hole 101 and the first pole output 1, and ensure that the battery is in a sealed state.

[0193] Optionally, the battery secondary short circuit prevention structure further comprises an inner insulation ring 32. The insulating sealing assembly 3 comprises the inner insulation ring 32. The inner insulation ring 32 is attached to the end surface of the first pole output 1 facing the inside of the battery. The inner insulation ring 32 is partially clamped between the first end surface 211 of the inner connecting portion 23 facing the insertion portion 24 and the first pole output 1. Optionally, the inner insulation ring 32 is partially clamped between the inner connecting portion 23 and the bottom of the avoidance groove 1022, and partially clamped between the inner connecting portion 23 and the sidewall of the avoidance groove 1022. While playing an insulation role, the inner insulation ring 32 fixes the position of the inner connecting portion 23 relative to the first pole output 1, and prevents the second pole post 2 from shaking radially relative to the first through hole 101.

[0194] Optionally, in this embodiment, the outer insulation ring 33 is an outer plastic, and the inner insulation ring 32 is an inner plastic. Optionally, the inner circle of the first positioning groove 331 of the outer insulation ring 33 is toothed, to prevent the outer insulation ring 33 from rotating relative to the first pole output 1. The end surface of the outer insulation ring 33 outwardly has a marking protrusion. The marking protrusion can be provided with a positive or negative sign, to facilitate identification. Optionally, the cross section of the inner connecting portion 23 is a square with missing corners, to prevent the second pole post 2 from rotating relative to the inner insulation ring 32. Since the inner insulation ring 32 is fixed relative to the first pole output 1, it can be ensured that the second pole post 2 will not rotate relative to the first pole output 1.

[0195] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole post 2 is inserted into the first through hole 101 of the cover plate, or the second pole post 2 is inserted into the first through hole 101 of the shell. In this embodiment, the second pole post 2 is inserted into the first through hole 101 of the cover plate. Optionally, a fourth heat-resistant insulation layer can be arranged on the positive pole post, or a fourth heat-resistant insulation layer can be arranged on the negative pole post, or a fourth heat-resistant insulation layer can be arranged on the positive pole post and a fourth heat-resistant insulation layer can be arranged on the negative pole post. Optionally, a fifth heat-resistant insulation layer can be arranged on the cover plate or the shell near the positive pole post, or a fifth heat-resistant insulation layer can be arranged on the cover plate or the shell near the negative pole post, or a fifth heat-resistant insulation layer can be arranged on the cover plate or the shell near the positive pole post and a fifth heat-resistant insulation layer can be arranged on the cover plate or the shell near the negative pole post. The second pole post 2 provided with the fourth heat-resistant insulation layer and the cover plate or the shell provided with the fifth heat-resistant insulation layer can be at the same pole connection position or at different pole connection positions.

[0196] It can be known that the end face of the insertion part 24 of the second pole post 2 away from the inner connection part 23 and the end face of the inner connection part 23 away from the insertion part 24 need to ensure the electrical conductivity, and therefore the electroplating heat-resistant insulation layer 42 cannot be used.

[0197] This embodiment also provides a battery comprising the battery secondary short circuit prevention structure and the battery cell 200 in the first pole output 1. Optionally, in this embodiment, the battery is a square battery, and of course in other embodiments, it can also be a cylindrical battery. The battery can help to prevent secondary short circuit and improve safety.

[0198] Embodiment six

[0199] As shown in FIGS. 24-27, the battery secondary short circuit prevention structure of this embodiment comprises a first pole output 1, a second pole post 2, an insulation sealing assembly 3 and a heat-resistant insulation structure. The difference between this embodiment and other embodiments is that the heat-resistant insulation structure is different.

[0200] In the embodiment, the heat-resistant insulation structure comprises the heat-resistant insulation layer 42, and the riveting block 7 is used for riveting connection between the second pole post 2 and the first pole output 1. The first pole output 1 is provided with a first through hole 101, and the riveting block 7 is provided with a second through hole 701. The riveting block 7 is located at the end surface of the first pole output 1 away from the inside of the battery, i.e. one side of the first pole output 1. One end of the second pole post 2 passes through the first through hole 101 and the second through hole 701 in sequence and is riveted to the inner wall of the second through hole 701. The insulation sealing assembly 3 is arranged between the riveting block 7 and the first pole output 1 and between the second pole post 2 and the first pole output 1. The heat-resistant insulation layer 42 comprises a sixth heat-resistant insulation layer 426, a seventh heat-resistant insulation layer 427 and / or an eighth heat-resistant insulation layer. The sixth heat-resistant insulation layer 426 is arranged on the first pole output 1 to prevent the riveting block 7 or the second pole post 2 from being in conduction with the first pole output 1. The seventh heat-resistant insulation layer 427 is arranged on the riveting block 7 to prevent the riveting block 7 from being in conduction with the first pole output 1. The eighth heat-resistant insulation layer is arranged on the second pole post 2 to prevent the second pole post 2 from being in conduction with the first pole output 1.

[0201] Even if the insulation sealing assembly 3 is melted and fails in a high-temperature environment, the sixth heat-resistant insulation layer 426 and the seventh heat-resistant insulation layer 427 can help to avoid contact between the riveting block 7 and the first pole output 1, causing secondary short circuit. The sixth heat-resistant insulation layer 426 and the eighth heat-resistant insulation layer can help to avoid contact between the second pole post 2 and the first pole output 1, causing secondary short circuit. Therefore, the secondary short circuit prevention structure of the battery can help to prevent secondary short circuit and improve safety.

[0202] As shown in FIG. 26, optionally, the end surface of the first pole output 1 away from the inside of the battery is provided with a second positioning groove 242, the groove bottom of the second positioning groove 242 is provided with the first through hole 101, and the riveting block 7 is partially located in the second positioning groove. The sixth heat-resistant insulation layer 426 comprises a seventh zone heat-resistant insulation layer 4261 located on the side wall and the groove bottom of the second positioning groove 242 to ensure that the side wall and the groove bottom of the second positioning groove 242 are insulated from the riveting block 7. Optionally, the connection between the side wall and the groove bottom of the second positioning groove also has a heat-resistant insulation layer structure.

[0203] Optionally, the sixth heat-resistant insulation layer 426 comprises an eighth zone heat-resistant insulation layer 4262 located on the inner wall of the first through hole 101 to prevent the inner wall of the first through hole 101 from contacting the second pole post 2 in a high-temperature environment, causing secondary short circuit.

[0204] Optionally, the second pole post 2 comprises an inner connecting part 23, the inner connecting part 23 is located at the end face of the first pole output 1 towards the inside of the battery, that is, the side of the first pole output 1 where the riveting block 7 is not arranged, the sixth heat-resistant insulation layer 426 comprises a ninth zone heat-resistant insulation layer 4263, the ninth zone heat-resistant insulation layer 4263 is located on the end face of the first pole output 1 towards the inner connecting part 23 around the first through hole 101, that is, the third end face 103, so as to prevent the short circuit between the fifth end face 231 of the inner connecting part 23 and the third end face 103 of the first pole output 1 in a high-temperature environment.

[0205] Optionally, the seventh zone heat-resistant insulation layer 4261, the eighth zone heat-resistant insulation layer 4262 and the ninth zone heat-resistant insulation layer 4263 are connected in sequence, and there is no discontinuity at the region connection, so as to prevent the second pole post 2 or the riveting block 7 from being in contact with the first pole output 1 at the discontinuity in a high-temperature environment, thereby causing secondary short circuit.

[0206] As shown in FIG. 27, optionally, the seventh heat-resistant insulation layer 427 is located between the side face of the riveting block 7 and the end face of the riveting block 7 towards the first pole output 1, specifically, between the first side face 702 of the riveting block 7 and the fourth end face 703 of the riveting block 7 towards the first pole output 1, so as to ensure the insulation between the first side face 702 of the riveting block 7 and the side wall of the second positioning groove and the insulation between the fourth end face 703 of the riveting block 7 towards the first pole output 1 and the groove bottom of the second positioning groove. Optionally, the connection between the first side face 702 of the riveting block 7 and the fourth end face 703 of the riveting block 7 towards the first pole output 1 also has a heat-resistant insulation layer structure.

[0207] Optionally, the second pole post 2 comprises a middle connecting part 21, and the second pole post 2 further comprises an outer connecting part 22, the outer connecting part 22, the middle connecting part 21 and the inner connecting part 23 are sequentially connected in the axial direction of the second pole post 2. Optionally, the outer connecting part 22 is located in the second through hole 701, the middle connecting part 21 is located at the first through hole 101, and the diameter of the inner connecting part 23 is greater than the diameters of the middle connecting part 21 and the outer connecting part 22. Optionally, in this embodiment, the inner connecting part 23 is used for electrical connection with the battery cell 200 in the battery. The outer connecting part 22 is located outside the battery, which is conducive to reducing the riveting difficulty and ensuring the riveting quality.

[0208] Optionally, the middle connecting part 21 is inserted at the first through hole 101, and the eighth heat-resistant insulation layer comprises a tenth zone heat-resistant insulation layer 4281, the tenth zone heat-resistant insulation layer 4281 is located on the side wall of the middle connecting part 21, so as to prevent the middle connecting part 21 from being in contact with the inner wall of the first through hole 101 in a high-temperature environment, thereby causing secondary short circuit.

[0209] Optionally, the eighth heat-resistant insulation layer comprises an eleventh zone heat-resistant insulation layer 4282, which is located on the end surface of the inner connecting part 23 facing the first pole output 1, i.e., the fifth end surface 231, to prevent the fifth end surface 231 of the inner connecting part 23 from contacting the third end surface 103 of the first pole output 1 under a high-temperature environment, causing secondary short circuit.

[0210] Optionally, the connection part of the tenth zone heat-resistant insulation layer 4281 and the eleventh zone heat-resistant insulation layer 4282 is not interrupted to prevent the second pole post 2 from contacting the first pole output 1 at the interrupted part, causing secondary short circuit.

[0211] Optionally, one of the sixth heat-resistant insulation layer 426 on the first pole output 1, the seventh heat-resistant insulation layer 427 on the riveting block 7, and the eighth heat-resistant insulation layer on the second pole post 2 is implemented, and the other two are not implemented, or two of them are implemented and the other is not implemented, or all three are implemented. Optionally, the above-mentioned multiple different implementation combinations can be implemented in the positive electrode region, or in the negative electrode region, or in both the positive electrode region and the negative electrode region.

[0212] Optionally, the thickness of the sixth heat-resistant insulation layer 426 is greater than 0.01 mm, optionally, the thickness of the seventh heat-resistant insulation layer 427 is greater than 0.01 mm, and optionally, the thickness of the eighth heat-resistant insulation layer is greater than 0.01 mm. If the thickness of the heat-resistant insulation layer 42 is too low, the insulation effect will be affected, and the upper limit of the thickness depends on the space design of the battery to balance the energy density and safety performance.

[0213] Optionally, the sixth heat-resistant insulation layer 426 is an aluminum oxide layer formed by electroplating, optionally, the seventh heat-resistant insulation layer 427 is an aluminum oxide layer formed by electroplating, and optionally, the eighth heat-resistant insulation layer is an aluminum oxide layer formed by electroplating. Aluminum oxide has good insulation properties and can withstand high temperatures. The electroplated aluminum oxide layer can ensure structural strength and connection strength, and electroplating is a very mature process, which is conducive to controlling costs and ensuring process quality.

[0214] Optionally, the insulation sealing assembly 3 comprises an outer insulation ring 33, which is at least partially clamped between the riveting block 7 and the first pole output 1. Optionally, the bottom plate of the outer insulation ring 33 is clamped between the bottom of the second positioning groove and the fourth end surface 703 of the riveting block 7. Optionally, the outer insulation ring 33 also has a side plate, which is arranged around the periphery of the bottom plate and covers the first side surface 702 of the riveting block 7, i.e., the side surface of the riveting block 7, to ensure insulation between the riveting block 7 and the first pole output 1.

[0215] Optionally, the insulation sealing assembly 3 further comprises an inner insulation ring 32, which is located at the side of the first pole output 1 where the riveting block 7 is not arranged, and is at least partially clamped between the second pole post 2 and the first pole output 1 to prevent short circuit between the inner connecting portion 23 of the second pole post 2 and the first pole output 1. Optionally, in this embodiment, the outer insulation ring 33 is an outer plastic, and the inner insulation ring 32 is an inner plastic.

[0216] Optionally, the insulation sealing assembly 3 further comprises a sealing ring 31, which is sleeved on the second pole post 2 and is at least partially clamped between the second pole post 2 and the inner wall of the first through hole 101 to seal the gap between the second pole post 2 and the inner wall of the first through hole 101. Optionally, the sealing ring 31 is also partially clamped between the fifth end surface 231 of the inner connecting portion 23 and the third end surface 103 of the first pole output 1, which helps to fix the position of the second pole post 2 relative to the first pole output 1 and has an insulation effect.

[0217] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole post 2 is inserted into the first through hole 101 of the cover plate or the first through hole 101 of the shell. In this embodiment, the second pole post 2 is inserted into the first through hole 101 of the cover plate. Optionally, a sixth heat-resistant insulation layer 426 can be arranged on the cover plate or the shell near the positive pole post, or a sixth heat-resistant insulation layer 426 can be arranged on the cover plate or the shell near the negative pole post, or a sixth heat-resistant insulation layer 426 can be arranged on the cover plate or the shell near the positive pole post and a sixth heat-resistant insulation layer 426 can be arranged on the cover plate or the shell near the negative pole post. Optionally, a seventh heat-resistant insulation layer 427 can be arranged on the riveting block 7 of the positive pole, or a seventh heat-resistant insulation layer 427 can be arranged on the riveting block 7 of the negative pole, or a seventh heat-resistant insulation layer 427 can be arranged on the riveting block 7 of the positive pole and a seventh heat-resistant insulation layer 427 can be arranged on the riveting block 7 of the negative pole. Optionally, an eighth heat-resistant insulation layer can be arranged on the positive pole post, or an eighth heat-resistant insulation layer can be arranged on the negative pole post, or an eighth heat-resistant insulation layer can be arranged on the positive pole post and an eighth heat-resistant insulation layer can be arranged on the negative pole post. The second pole post 2 provided with the eighth heat-resistant insulation layer, the riveting block 7 provided with the seventh heat-resistant insulation layer 427, and the cover plate or the shell provided with the sixth heat-resistant insulation layer 426 can all be in the same pole region or in different pole regions.

[0218] This embodiment also provides a battery comprising the above-mentioned battery secondary short circuit prevention structure and a battery cell 200 located in the first pole output 1. Optionally, in this embodiment, the battery is a square battery, and of course in other embodiments, it can also be a cylindrical battery. The battery can help to prevent secondary short circuit and improve safety.

[0219] Embodiment Seven

[0220] As shown in FIGS. 28-31, the battery secondary short circuit prevention structure of the present embodiment includes a first pole output 1, a second pole post 2, an insulating sealing assembly 3, and a heat-resistant insulation structure. The present embodiment differs from other embodiments in that the heat-resistant insulation structure is different.

[0221] In the present embodiment, the heat-resistant insulation structure includes a heat-resistant insulation layer 42, and the second pole post 2 and the first pole output 1 are connected by riveting connection through the riveting flange of the first pole output 1. The first pole output 1 is provided with a first through hole 101, and the first pole output 1 has a riveting tubular structure 104 coaxially arranged with the first through hole 101 and surrounding the first through hole 101. The second pole post 2 has an annular protruding portion 25 protruding along the radial direction of the second pole post 2, and the second pole post 2 is inserted into the first through hole 101 along the axial direction of the second pole post 2, and the end face of the annular protruding portion 25 facing the inside of the battery (i.e., the sixth end face 251) abuts against the first face 105 of the first pole output 1 surrounding the first through hole 101 and perpendicular to the axial direction of the second pole post 2, and the riveting tubular structure 104 is riveted and bent to cover the side face of the annular protruding portion 25 and the end face of the annular protruding portion 25 away from the inside of the battery (i.e., the seventh end face 252). The heat-resistant insulation layer 42 includes a ninth heat-resistant insulation layer 429 and / or a tenth heat-resistant insulation layer 430, the ninth heat-resistant insulation layer 429 is arranged on the side wall of the second pole post 2, and the tenth heat-resistant insulation layer 430 is arranged on the face of the first pole output 1 facing the second pole post 2; the insulating sealing assembly 3 is at least partially sleeved on the side wall of the second pole post 2, and the insulating sealing assembly 3 is at least partially clamped between the second pole post 2 and the first pole output 1.

[0222] When the temperature of the battery is very high, the insulating sealing assembly 3 may be melted and failed, but the ninth heat-resistant insulation layer 429 and / or the tenth heat-resistant insulation layer 430 help to prevent the second pole post 2 from contacting the first pole output 1 to prevent secondary short circuit and improve safety.

[0223] As shown in FIG. 30, optionally, the ninth heat-resistant insulation layer 429 includes a twelfth zone heat-resistant insulation layer 4291 located at the end face of the annular protruding portion 25 facing the inside of the battery, i.e., the sixth end face 251, to prevent the sixth end face 251 of the annular protruding portion 25 from contacting the first face 105 of the first pole output 1 to cause secondary short circuit in a high temperature environment.

[0224] Optionally, the ninth heat-resistant insulation layer 429 includes a thirteenth zone heat-resistant insulation layer 4292 located at the side face of the annular protruding portion 25 to prevent the side face of the annular protruding portion 25 from contacting the inner wall of the riveting tubular structure 104 of the first pole output 1 to cause secondary short circuit in a high temperature environment.

[0225] Optionally, the ninth heat-resistant insulation layer 429 comprises a fourteenth heat-resistant insulation layer 4293 located at the end face of the annular protrusion 25 away from the inside of the battery, i.e., the seventh end face 252, to prevent the seventh end face 252 of the annular protrusion 25 from contacting the inner wall of the riveted tubular structure 104 of the first pole output 1 under high-temperature environment, causing secondary short circuit.

[0226] Optionally, the second pole post 2 comprises a first part 26 located at one end of the annular protrusion 25 along the axial direction of the second pole post 2, i.e., the end of the second pole post 2 facing the inside of the battery, and the end face of the first part 26 is used for current conduction. The ninth heat-resistant insulation layer 429 comprises a fifteenth heat-resistant insulation layer 4294 located at the side wall of the first part 26. Optionally, the end face of the first part 26 is used for electrical connection with the outside world. Under high-temperature environment, the side wall of the first part 26 may contact the side wall of the opening formed after the riveted tubular structure 104 is bent, so the fifteenth heat-resistant insulation layer 4294 can prevent the second pole post 2 from contacting the first pole output 1 at this position, which helps to avoid secondary short circuit.

[0227] Optionally, the second pole post 2 comprises a second part 27 located at the other end of the annular protrusion 25 along the axial direction of the second pole post 2, i.e., the end of the second pole post 2 away from the inside of the battery, and the end face of the second part 27 is used for current conduction. The ninth heat-resistant insulation layer 429 comprises a sixteenth heat-resistant insulation layer 4295 located at the side wall of the second part 27. Optionally, the end face of the second part 27 is used for electrical connection with the battery cell 200 inside the battery. Under high-temperature environment, the side wall of the second part 27 may contact the inner wall of the first through hole 101, so the sixteenth heat-resistant insulation layer 4295 can prevent the second pole post 2 from contacting the first pole output 1 at this position, which helps to avoid secondary short circuit.

[0228] Optionally, the fifteenth heat-resistant insulation layer 4294, the fourteenth heat-resistant insulation layer 4293, the thirteenth heat-resistant insulation layer 4292, the twelfth heat-resistant insulation layer 4291, and the sixteenth heat-resistant insulation layer 4295 are sequentially connected without gaps between adjacent regions to avoid the formation of secondary short circuit at the connection between the regions.

[0229] Optionally, the edges of the end faces of the first part and the second part are chamfered, and the ninth heat-resistant insulation layer 429 also covers the chamfered annular surface at both ends of the second pole post 2 to prevent the first pole output 1 from deforming and contacting the chamfered annular surface under high temperature.

[0230] As shown in FIG. 31, to further avoid secondary short circuit, optionally, the tenth heat-resistant insulation layer 430 includes a seventeenth zone heat-resistant insulation layer 4301 located on the inner wall of the riveted tubular structure 104, i.e. the side wall of the first pole output 1 corresponding to the first part close to the second pole post 2 and the seventh end surface 252 and the side surface of the annular protruding part 25, and the seventeenth zone heat-resistant insulation layer 4301 is arranged on the side wall, the seventh end surface 252 and the side surface of the annular protruding part 25. Optionally, in this embodiment, the riveted tubular structure 104 forms a connected tubular segment and an annular segment after riveting, and the inner wall of the tubular segment and the side surface of the annular segment facing the second pole post 2 are provided with the seventeenth zone heat-resistant insulation layer 4301 to prevent the inner wall of the tubular segment and the side surface of the annular segment facing the second pole post 2 from contacting the second pole post 2 in a high-temperature environment, thereby causing secondary short circuit.

[0231] Optionally, the tenth heat-resistant insulation layer 430 includes an eighteenth zone heat-resistant insulation layer 4302 located on the first surface 105 to prevent the first surface 105 from contacting the sixth end surface 251 of the annular protruding part 25 in a high-temperature environment, thereby preventing secondary short circuit.

[0232] Optionally, the tenth heat-resistant insulation layer 430 includes a nineteenth zone heat-resistant insulation layer 4303 located on the inner wall of the first through hole 101 to prevent the second part of the second pole post 2 from moving to contact the inner wall of the first through hole 101 in a high-temperature environment, thereby preventing secondary short circuit.

[0233] Optionally, the tenth heat-resistant insulation layer 430 includes a twentieth zone heat-resistant insulation layer 4304 located on the second surface 106 of the first pole output 1 located around the first through hole 101 and perpendicular to the axial direction of the second pole post 2, and the second surface 106 is opposite to the first surface 105 to prevent the first pole output 1 from deforming in a high-temperature environment, thereby preventing the annular area where the first surface 105 and the second surface 106 of the first pole output 1 are located from being bent, causing the second surface 106 to contact the side wall of the second part of the second pole post 2, thereby causing secondary short circuit. Optionally, a second positioning groove is formed on one side of the second surface 106, the second surface 106 is located at the bottom of the second positioning groove, and the twentieth zone heat-resistant insulation layer 4304 is laid on the bottom of the second positioning groove.

[0234] Optionally, the seventeenth zone heat-resistant insulation layer 4301, the eighteenth zone heat-resistant insulation layer 4302, the nineteenth zone heat-resistant insulation layer 4303 and the twentieth zone heat-resistant insulation layer 4304 are sequentially connected without interruption at the zone connection to prevent the second pole post 2 from contacting the first pole output 1 at the interruption, thereby causing secondary short circuit.

[0235] In some embodiments, the ninth heat-resistant insulation layer 429 is arranged on the second pole post 2 only, and the tenth heat-resistant insulation layer 430 is not arranged on the first pole output 1. In other embodiments, the tenth heat-resistant insulation layer 430 is arranged on the first pole output 1 only, and the ninth heat-resistant insulation layer 429 is not arranged on the second pole post 2. In yet other embodiments, the ninth heat-resistant insulation layer 429 is arranged on the second pole post 2, and the tenth heat-resistant insulation layer 430 is arranged on the first pole output 1.

[0236] Optionally, the thickness of the ninth heat-resistant insulation layer 429 is greater than 0.01 mm, and optionally, the thickness of the tenth heat-resistant insulation layer 430 is greater than 0.01 mm. If the thickness of the heat-resistant insulation layer 42 is too low, the insulation effect will be affected. The upper limit of the thickness depends on the space design of the battery, to balance the energy density and safety performance.

[0237] Optionally, the ninth heat-resistant insulation layer 429 is an electroplated aluminum oxide layer, and optionally, the tenth heat-resistant insulation layer 430 is an electroplated aluminum oxide layer. Aluminum oxide has good insulation properties and can withstand high temperatures. The electroplated aluminum oxide layer can ensure the structural strength and connection strength.

[0238] Optionally, the insulation sealing assembly 3 comprises an outer insulation ring 33, which is sleeved on the second pole post 2 and at least partially clamped between the second pole post 2 and the riveted tubular structure 104. Optionally, the outer insulation ring 33 is also partially clamped between the annular protruding portion 25 and the first face 105.

[0239] Optionally, the insulation sealing assembly 3 further comprises an inner insulation ring 32, which is arranged on the side of the first pole output 1 where the second face 106 is located, to prevent the side of the first pole output 1 from contacting the second pole post 2 or the pole tab. Optionally, in this embodiment, the outer insulation ring 33 is an outer plastic, and the inner insulation ring 32 is an inner plastic.

[0240] Optionally, the insulation sealing assembly 3 further comprises a sealing ring 31, which is sleeved on the second pole post 2 and partially clamped between the second pole post 2 and the inner wall of the first through hole 101. Optionally, the sealing ring 31 is also partially clamped between the sixth end face 251 of the annular protruding portion 25 and the first face 105 of the first pole output 1, and the sealing ring 31 is close to the root of the second pole post 2.

[0241] Optionally, the first pole output 1 comprises a cover plate and a shell, and the second pole stud 2 is inserted into the first through hole 101 of the cover plate, or the second pole stud 2 is inserted into the first through hole 101 of the shell. In this embodiment, the second pole stud 2 is inserted into the first through hole 101 of the cover plate. Optionally, the ninth heat-resistant insulation layer 429 can be arranged on the positive pole stud, or the ninth heat-resistant insulation layer 429 can be arranged on the negative pole stud, or the ninth heat-resistant insulation layer 429 can be arranged on the positive pole stud and the ninth heat-resistant insulation layer 429 can be arranged on the negative pole stud. Optionally, the tenth heat-resistant insulation layer 430 can be arranged on the cover plate or the shell near the positive pole stud, or the tenth heat-resistant insulation layer 430 can be arranged on the cover plate or the shell near the negative pole stud, or the tenth heat-resistant insulation layer 430 can be arranged on the cover plate or the shell near the positive pole stud and the tenth heat-resistant insulation layer 430 can be arranged on the cover plate or the shell near the negative pole stud. The second pole stud 2 provided with the ninth heat-resistant insulation layer 429 and the cover plate or the shell provided with the tenth heat-resistant insulation layer 430 can be at the same pole connection position or at different pole connection positions.

[0242] The present embodiment also provides a battery comprising the battery secondary short circuit prevention structure described above and the battery cell 200 located in the first pole output 1. Optionally, in this embodiment, the battery is a square battery, and of course in other embodiments, it can also be a cylindrical battery. The battery can help to prevent secondary short circuit and improve safety.

[0243] Obviously, the above-mentioned embodiments of the present application are only examples for the purpose of clear illustration, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the scope of the present application. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent substitution and improvement made in the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery secondary short circuit prevention structure, comprising: a first pole output (1) having a first through hole (101) formed therein; a second pole post (2) disposed at the first through hole (101) and at least partially inserted into the first through hole (101); an insulation sealing assembly (3) disposed between the second pole post (2) and the first pole output (1) and configured to insulate and seal the second pole post (2) and the first pole output (1) to form a primary insulation protection; a heat-resistant insulation structure disposed between the first pole output (1) and the second pole post (2) to form a secondary insulation protection between the second pole post (2) and the first pole output (1). 2.The battery secondary short circuit prevention structure according to claim 1, wherein: the heat-resistant insulation structure comprises a heat-resistant insulation member sleeved on the second pole post (2) and made of an organic positive temperature coefficient (PTC) thermistor, ceramic or mica to have an insulation effect when the battery is in thermal runaway; 3. The battery secondary short-circuit prevention structure according to claim 2, wherein the second pole post (2) comprises a middle connecting portion (21) and an outer connecting portion (22) sequentially arranged along an axial direction of the second pole post (2), the middle connecting portion (21) is partially inserted into the first through hole (101), and the outer connecting portion (22) protrudes out of the first through hole (101) along a radial direction of the second pole post (2); the insulation sealing assembly (3) comprises a sealing ring (31) sleeved on the middle connecting portion (21) and clamped between an end surface of the first pole output (1) facing away from an inside of a battery and an end surface of the outer connecting portion (22) facing toward the inside of the battery; the heat-resistant insulation member comprises a first heat-resistant insulation ring (411) sleeved on the middle connecting portion (21) and clamped between the end surface of the outer connecting portion (22) facing toward the inside of the battery and the sealing ring (31) or clamped between the sealing ring (31) and the end surface of the first pole output (1) facing away from the inside of the battery; 4. The battery secondary short-circuit prevention structure according to claim 3, wherein the first heat-resistant insulation ring (411) comprises a first insulation ring (4111) clamped between the end surface of the outer connecting portion (22) facing toward the inside of the battery and the sealing ring (31) and a second insulation ring (4112) clamped between the sealing ring (31) and the end surface of the first pole output (1) facing away from the inside of the battery.

5. The battery secondary short-circuit prevention structure according to claim 4, wherein The first heat-resistant insulation ring (411) further comprises a first connecting portion (4113) configured to connect the first insulation ring (4111) and the second insulation ring (4112), and the first connecting portion, the first insulation ring (4111) and the second insulation ring (4112) are integrally formed.

6. The battery secondary short-circuit prevention structure according to claim 5, wherein The first connecting portion is tubular, one end of the first connecting portion is connected to the first insulation ring (4111) along the axial direction of the first connecting portion, the other end of the first connecting portion is connected to the second insulation ring (4112), and the first connecting portion is sleeved on the middle connecting portion (21) or the outer ring of the sealing ring (31).

7. The battery secondary short-circuit prevention structure according to any one of claims 3 to 6, wherein The insulation sealing assembly (3) further comprises an inner insulation ring (32), the battery secondary short circuit prevention structure further comprises a third insulation ring (5), the second pole post (2) further comprises an inner connecting portion (23) connected to one end of the middle connecting portion (21) away from the outer connecting portion (22), the inner insulation ring (32) is sleeved on the middle connecting portion (21), and the inner insulation ring (32) is partially clamped between the end face of the inner connecting portion (23) away from the inside of the battery and the end face of the first pole output (1) facing the inside of the battery, the third insulation ring (5) is sleeved on the middle connecting portion (21), and the third insulation ring (5) is clamped between the end face of the inner connecting portion (23) away from the inside of the battery and the inner insulation ring (32), or the third insulation ring (5) is clamped between the inner insulation ring (32) and the end face of the first pole output (1) facing the inside of the battery.

8. The battery secondary short circuit prevention structure according to claim 7, further comprising a second connecting portion (6), the third insulation ring (5) is clamped between the inner insulation ring (32) and the end face of the first pole output (1) facing the inside of the battery, the first heat-resistant insulation ring (411) is clamped between the sealing ring (31) and the end face of the first pole output (1) away from the inside of the battery, and the second connecting portion (6) is configured to connect the third insulation ring (5) and the first heat-resistant insulation ring (411).

9. The battery secondary short-circuit prevention structure according to claim 8, wherein The second connecting portion (6) is tubular, one end of the second connecting portion (6) is connected to the third insulation ring (5) along the axial direction of the second connecting portion (6), the other end of the second connecting portion (6) is connected to the first heat-resistant insulation ring (411), and the second connecting portion (6) is arranged in close contact with the inner wall of the first through hole (101).

10. The battery secondary short-circuit prevention structure according to claim 7, wherein The third insulation ring (5) is made of organic PTC thermistor, ceramic or mica, so that the third insulation ring (5) has insulation effect when the battery is in thermal runaway.

11. The battery secondary short-circuit prevention structure according to claim 2, wherein The second pole post (2) comprises the inner connecting portion (23) and the middle connecting portion (21) arranged in sequence along the axial direction of the second pole post (2), the middle connecting portion (21) is partially inserted at the first through hole (101), and the inner connecting portion (23) protrudes out of the first through hole (101) along the radial direction of the second pole post (2). The insulation sealing assembly (3) comprises an inner insulation ring (32), the inner insulation ring (32) is sleeved on the middle connecting part (21), and a ring part (321) of the inner insulation ring (32) is clamped between an end face of the inner connecting part (23) away from the battery interior and an end face of the first pole output (1) towards the battery interior; The heat-resistant insulation part comprises a second heat-resistant insulation ring (412), the second heat-resistant insulation ring (412) is sleeved on the middle connecting part (21), and the second heat-resistant insulation ring (412) is clamped between the ring part (321) and the end face of the inner connecting part (23) away from the battery interior, or the second heat-resistant insulation ring (412) is clamped between the ring part (321) and the end face of the first pole output (1) towards the battery interior.

12. The battery secondary short-circuit prevention structure according to claim 11, wherein The second heat-resistant insulation ring (412) is clamped between the ring part (321) and the end face of the inner connecting part (23) away from the battery interior, and an inner side edge of the second heat-resistant insulation ring (412) abuts against the middle connecting part (21); And / or, an outer side edge of the second heat-resistant insulation ring (412) is flush with an outer side edge of the inner connecting part (23), or the outer side edge of the second heat-resistant insulation ring (412) protrudes radially beyond the outer side edge of the inner connecting part (23).

13. The battery secondary short-circuit prevention structure according to claim 11, wherein The second heat-resistant insulation ring (412) is clamped between the ring part (321) and the end face of the first pole output (1) towards the battery interior, and the inner insulation ring (32) further comprises a tubular part (322) connected with the ring part (321), the tubular part (322) is sleeved on the middle connecting part (21), and an inner side edge of the second heat-resistant insulation ring (412) abuts against the tubular part (322); And / or, an outer side edge of the second heat-resistant insulation ring (412) is flush with an outer side edge of the inner connecting part (23), or the outer side edge of the second heat-resistant insulation ring (412) protrudes radially beyond the outer side edge of the inner connecting part (23).

14. The battery secondary short-circuit prevention structure according to claim 11, wherein The second heat-resistant insulation ring (412) comprises a fourth insulation ring (4121) clamped between the ring part (321) and the end face of the inner connecting part (23) away from the battery interior, and a fifth insulation ring (4122) clamped between the ring part (321) and the end face of the first pole output (1) towards the battery interior.

15. The battery secondary short-circuit prevention structure according to claim 14, wherein The second heat-resistant insulation ring (412) further comprises a third connecting part (4123) configured to connect the fourth insulation ring (4121) and the fifth insulation ring (4122), and the third connecting part, the fourth insulation ring (4121) and the fifth insulation ring (4122) are integrally formed.

16. The battery secondary short-circuit prevention structure according to claim 15, wherein The third connecting part is a ring-shaped connecting part, one end of which is connected to the fourth insulating ring (4121) along the axial direction of the ring-shaped connecting part, and the other end of which is connected to the fifth insulating ring (4122), and the ring-shaped connecting part is sleeved outside the ring-shaped part (321).

17. The battery secondary short-circuit prevention structure according to any one of claims 11 to 16, wherein The second pole post (2) further comprises an outer connecting part (22) connected to one end of the middle connecting part (21) away from the inside of the battery.

18. The battery secondary short-circuit prevention structure according to claim 17, wherein The insulating sealing assembly (3) further comprises a sealing ring (31) sleeved on the middle connecting part (21), and the sealing ring (31) is clamped between the end face of the outer connecting part (22) towards the inside of the battery and the end face of the first pole output (1) away from the inside of the battery. And / or, the insulating sealing assembly (3) further comprises an outer insulating ring (33) partially sleeved on the outer connecting part (22) and partially clamped between the end face of the outer connecting part (22) towards the inside of the battery and the end face of the first pole output (1) away from the inside of the battery.

19. The battery secondary short-circuit prevention structure according to claim 2, wherein The second pole post (2) comprises a middle connecting part (21) partially inserted at the first through hole (101); The insulating sealing assembly (3) is sleeved on the middle connecting part (21) and is partially clamped between the middle connecting part (21) and the inner wall of the first through hole (101); The heat-resistant insulating part comprises a first heat-resistant insulating tube (413) sleeved on the middle connecting part (21), and the first heat-resistant insulating tube (413) is clamped between the middle connecting part (21) and the insulating sealing assembly (3).

20. The battery secondary short-circuit prevention structure according to claim 19, wherein The second pole post (2) further comprises an inner connecting part (23) connected to one end of the middle connecting part (21) close to the inside of the battery, the inner connecting part (23) protrudes radially from the middle connecting part (21), and one end of the first heat-resistant insulating tube (413) abuts against the end face of the inner connecting part (23) away from the inside of the battery. And / or, the second pole post (2) further comprises an outer connecting part (22) connected to one end of the middle connecting part (21) away from the inside of the battery, the outer connecting part (22) protrudes radially from the middle connecting part (21), and the other end of the first heat-resistant insulating tube (413) abuts against the end face of the outer connecting part (22) towards the inside of the battery.

21. The battery secondary short-circuit prevention structure according to claim 19, wherein The second pole post (2) further comprises an inner connecting portion (23) connected to one end of the middle connecting portion (21) close to the inside of the battery, the inner connecting portion (23) protrudes the middle connecting portion (21) along its radial direction, the insulation sealing assembly (3) comprises a first ring clamped between the end face of the inner connecting portion (23) away from the inside of the battery and the end face of the first pole output (1) toward the inside of the battery, the heat-resistant insulation member further comprises a third heat-resistant insulation ring (414) clamped between the end face of the inner connecting portion (23) away from the inside of the battery and the first ring, or clamped between the first ring and the end face of the first pole output (1) toward the inside of the battery.

22. The battery secondary short-circuit prevention structure according to claim 21, wherein The inner ring of the third heat-resistant insulation ring (414) is connected to the outer wall of the first heat-resistant insulation tube (413).

23. The battery secondary short-circuit prevention structure according to any one of claims 19 to 22, wherein The second pole post (2) further comprises an outer connecting portion (22) connected to one end of the middle connecting portion (21) away from the inside of the battery, the outer connecting portion (22) protrudes the middle connecting portion (21) along its radial direction, the insulation sealing assembly (3) comprises a second ring clamped between the end face of the outer connecting portion (22) toward the inside of the battery and the end face of the first pole output (1) away from the inside of the battery, the heat-resistant insulation member further comprises a fourth heat-resistant insulation ring (415) clamped between the end face of the outer connecting portion (22) toward the inside of the battery and the second ring, or clamped between the second ring and the end face of the first pole output (1) away from the inside of the battery.

24. The battery secondary short-circuit prevention structure according to claim 23, wherein The inner ring of the fourth heat-resistant insulation ring (415) is connected to the outer wall of the first heat-resistant insulation tube (413).

25. The battery secondary short circuit prevention structure according to any one of claims 19-22, further comprising a second heat-resistant insulation tube (416) sleeved outside the insulation sealing assembly (3) and clamped between the insulation sealing assembly (3) and the inner wall of the first through hole (101).

26. The battery secondary short circuit prevention structure according to claim 25, further comprising a support connecting ring (417), the insulation sealing assembly (3) comprises an inner insulation ring (32) and a sealing ring (31) arranged in sequence along the axial direction of the second pole post (2), the support connecting ring is clamped between the inner insulation ring (32) and the sealing ring (31), the inner ring of the support connecting ring is connected to the first heat-resistant insulation tube (413), and the outer ring of the support connecting ring is connected to the second heat-resistant insulation tube.

27. The battery secondary short-circuit prevention structure according to claim 3, 11, or 19, wherein The material of the heat-resistant insulation member is ceramic PTC thermistor.

28. The battery secondary short circuit prevention structure according to claim 3, 11 or 19, wherein, The second pole post (2) and the first pole output (1) are riveted; or, The second pole post (2) is connected with the first pole output (1) by gluing; or, Further comprising a riveting block (7), the second pole post (2) passes through the first through hole (101) and is connected with the riveting block (7) by riveting; or, The first pole output (1) has a riveting flange, the riveting flange is coaxially arranged with the first through hole (101) and surrounds the periphery of the first through hole (101), and the riveting flange is pressed and bent to cover at least part of the second pole post (2).

29. The battery secondary short-circuit prevention structure according to claim 3, 11, or 19, wherein The first pole output (1) comprises a cover plate and a shell, the second pole post (2) is inserted into the first through hole (101) of the cover plate, or the second pole post (2) is inserted into the first through hole (101) of the shell.

30. The battery secondary short-circuit prevention structure according to claim 1, wherein The heat-resistant insulation structure comprises a heat-resistant insulation layer (42), which is arranged between the first pole output (1) and the second pole post (2).

31. The battery secondary short-circuit prevention structure according to claim 30, wherein The second pole post (2) is riveted at the first through hole (101), and the heat-resistant insulation layer (42) is arranged on the side wall of the second pole post (2); At least part of the insulation sealing assembly (3) is clamped between the heat-resistant insulation layer (42) and the first pole output (1).

32. The battery secondary short-circuit prevention structure according to claim 31, wherein The second pole post (2) comprises an inner connecting portion (23) located inside the battery, and an end face of the inner connecting portion (23) is electrically connected with a tab of the battery cell (200). The heat-resistant insulation layer (42) comprises a first heat-resistant insulation layer (421) located on an end face of the inner connecting portion (23) away from the inside of the battery, and / or a first heat-resistant insulation layer (421) located on a side wall of the inner connecting portion (23).

33. The battery secondary short-circuit prevention structure according to claim 32, wherein The insulation sealing assembly (3) comprises an inner insulation ring (32) clamped between an end face of the inner connecting portion (23) away from the inside of the battery and a wall surface of the first pole output (1) facing the inside of the battery.

34. The battery secondary short-circuit prevention structure according to claim 31, wherein The second pole post (2) comprises a middle connecting portion (21) inserted into the first through hole (101), and the heat-resistant insulation layer (42) comprises a second heat-resistant insulation layer (422) located on a side wall of the middle connecting portion (21).

35. The battery secondary short-circuit prevention structure according to claim 34, wherein The insulation sealing assembly (3) comprises an inner insulation ring (32) clamped between a side wall of the middle connecting portion (21) and an inner wall of the first through hole (101).

36. The battery secondary short-circuit prevention structure according to any one of claims 31-35, wherein The second pole post (2) comprises an outer connecting portion (22) located outside the battery, and an end face of the outer connecting portion (22) is used for electrical connection with the outside world; The heat-resistant insulation layer (42) comprises a third heat-resistant insulation layer (423) located on an end face of the outer connecting portion (22) facing the inside of the battery, and / or a third heat-resistant insulation layer (423) located on a side wall of the outer connecting portion (22).

37. The battery secondary short-circuit prevention structure according to claim 36, wherein The insulation sealing assembly (3) comprises a sealing ring (31) and an outer insulation ring (33), the sealing ring (31) is clamped between the end surface of the outer connecting portion (22) toward the battery interior and the wall surface of the first pole output (1) away from the battery interior, and the outer insulation ring (33) is partially clamped between the end surface of the outer connecting portion (22) toward the battery interior and the wall surface of the first pole output (1) away from the battery interior.

38. The battery secondary short-circuit prevention structure according to any one of claims 31-35, wherein The thickness of the heat-resistant insulation layer (42) is greater than 0.01 mm. And / or, the heat-resistant insulation layer (42) is an electroplated aluminum oxide layer.

39. The battery secondary short-circuit prevention structure according to any one of claims 31-35, wherein The first pole output (1) comprises a cover plate and a shell, and the second pole post (2) is riveted at the first through hole (101) of the cover plate, or the second pole post (2) is riveted at the first through hole (101) of the shell.

40. The battery secondary short-circuit prevention structure according to claim 30, wherein The second pole post (2) comprises an inner connecting portion (23) and an insertion portion (24) connected to each other, the insertion portion (24) is inserted at the first through hole (101), and a side wall of the insertion portion (24) is annularly provided with a first positioning groove (241) along the axial direction of the insertion portion (24), and the inner connecting portion (23) is located at the end surface of the first pole output (1) toward the battery interior. The insulation sealing assembly (3) comprises an outer insulation ring (33), the outer insulation ring (33) is formed by a rubber coating process, the outer insulation ring (33) is partially inserted into the first positioning groove (241), partially covers the end surface of the first pole output (1) away from the battery interior, and partially clamped between the side wall of the insertion portion (24) and the inner wall of the first through hole (101). The heat-resistant insulation layer (42) comprises a fourth heat-resistant insulation layer and / or a fifth heat-resistant insulation layer, the fourth heat-resistant insulation layer is arranged on the side wall of the second pole post (2), and the fifth heat-resistant insulation layer is arranged on the surface of the first pole output (1) toward the second pole post (2).

41. The battery secondary short circuit prevention structure according to claim 40, wherein, The fourth heat-resistant insulation layer comprises a first area heat-resistant insulation layer (4241) located on the side wall of the insertion portion (24); And / or, in a first direction perpendicular to the axial direction of the second pole post (2), the maximum size of the inner connecting portion (23) is greater than the maximum size of the first through hole (101), the fourth heat-resistant insulation layer comprises a second area heat-resistant insulation layer (4242) located on the first end surface (211) of the inner connecting portion (23) toward the insertion portion (24); And / or, the fourth heat-resistant insulation layer comprises a third area heat-resistant insulation layer (4243) located on the side wall of the inner connecting portion (23).

42. The battery secondary short-circuit prevention structure according to claim 40, wherein The fifth heat-resistant insulation layer comprises a fourth-zone heat-resistant insulation layer (4251) located on the end surface of the first pole output (1) facing away from the inside of the battery and surrounding the first through hole (101).

43. The battery secondary short-circuit prevention structure according to claim 42, wherein The end surface of the first pole output (1) facing away from the inside of the battery is provided with a positioning ring (102) located around the first through hole (101), and the positioning ring (102) is inserted into the first positioning groove (331) of the outer insulation ring (33). The fourth-zone heat-resistant insulation layer (4251) is located on the end surface of the positioning ring (102) facing away from the first pole output (1), and / or the fourth-zone heat-resistant insulation layer (4251) is located on the inner wall of the positioning ring (102), and / or the fourth-zone heat-resistant insulation layer (4251) is located on the end surface of the first pole output (1) facing away from the inside of the battery in the positioning ring (102).

44. The battery secondary short-circuit prevention structure according to claim 40, wherein The fifth heat-resistant insulation layer comprises a fifth-zone heat-resistant insulation layer (4252) located on the inner wall of the first through hole (101).

45. The battery secondary short-circuit prevention structure according to any one of claims 40-44, wherein The fifth heat-resistant insulation layer comprises a sixth-zone heat-resistant insulation layer (4253) located on the end surface of the first pole output (1) facing the inside of the battery and surrounding the first through hole (101).

46. The battery secondary short-circuit prevention structure according to claim 45, wherein The end surface of the first pole output (1) facing the inside of the battery is provided with an avoidance groove (1022), and the first through hole (101) is located at the groove bottom of the avoidance groove (1022). The avoidance groove (1022) is coaxially arranged with the inner connecting part (23), and the maximum size of the inner connecting part (23) is smaller than the maximum size of the groove bottom of the avoidance groove (1022) in the first direction perpendicular to the axial direction of the second pole post (2). The sixth-zone heat-resistant insulation layer (4253) is located at the groove bottom of the avoidance groove (1022), and / or the sixth-zone heat-resistant insulation layer (4253) is located on the side wall of the avoidance groove (1022).

47. The battery secondary short-circuit prevention structure according to any one of claims 40-44, wherein The thickness of the fourth heat-resistant insulation layer is greater than 0.01 mm, and / or the thickness of the fifth heat-resistant insulation layer is greater than 0.01 mm. The fourth heat-resistant insulation layer is an electroplated aluminum oxide layer, and / or the fifth heat-resistant insulation layer is an electroplated aluminum oxide layer.

48. The battery secondary short-circuit prevention structure according to any one of claims 40-44, wherein The first pole output (1) comprises a cover plate and a shell, and the second pole post (2) is inserted into the first through hole (101) of the cover plate or the first through hole (101) of the shell.

49. The battery secondary short-circuit prevention structure according to any one of claims 40-44, wherein ​ 50. The battery secondary short circuit prevention structure according to claim 30, further comprising a riveting block (7) having a second through hole (701) formed therein, the riveting block (7) being located at an end surface of the first pole output (1) facing away from the interior of the battery, and one end of the second pole post (2) sequentially passing through the first through hole (101) and the second through hole (701) and being riveted to an inner wall of the second through hole (701); the heat-resistant insulation layer (42) comprises a sixth heat-resistant insulation layer (426) arranged on the first pole output (1) to prevent the riveting block (7) or the second pole post (2) from being in conduction with the first pole output (1); a seventh heat-resistant insulation layer (427) arranged on the riveting block (7) to prevent the riveting block (7) from being in conduction with the first pole output (1); and an eighth heat-resistant insulation layer arranged on the second pole post (2) to prevent the second pole post (2) from being in conduction with the first pole output (1); the insulating sealing assembly (3) is clamped between the riveting block (7) and the first pole output (1) and between the second pole post (2) and the first pole output (1).

51. The battery secondary short-circuit prevention structure according to claim 50, wherein the end surface of the first pole output (1) facing away from the interior of the battery is provided with a second positioning groove (242), a bottom of the second positioning groove is provided with the first through hole (101), the riveting block (7) is partially located in the second positioning groove, and the sixth heat-resistant insulation layer (426) comprises a seventh zone heat-resistant insulation layer (4261) located on a side wall and a bottom of the second positioning groove; and / or, the sixth heat-resistant insulation layer (426) comprises an eighth zone heat-resistant insulation layer (4262) located on an inner wall of the first through hole (101); and / or, the second pole post (2) comprises an inner connecting portion (23) located at an end surface of the first pole output (1) facing toward the interior of the battery, and the sixth heat-resistant insulation layer (426) comprises a ninth zone heat-resistant insulation layer (4263) located on an end surface of the first pole output (1) facing toward the inner connecting portion (23) around the first through hole (101).

52. The battery secondary short-circuit prevention structure according to claim 50, wherein the seventh heat-resistant insulation layer (427) is located on a side surface of the riveting block (7) and an end surface of the riveting block (7) facing toward the first pole output (1).

53. The battery secondary short-circuit prevention structure according to claim 50, wherein the second pole post (2) comprises a middle connecting portion (21) inserted at the first through hole (101), and the eighth heat-resistant insulation layer comprises a tenth zone heat-resistant insulation layer (4281) located on a side wall of the middle connecting portion (21); And / or, the second pole post (2) comprises an inner connecting part (23) located at an end face of the first pole output (1) towards the inside of the battery, and the eighth heat-resistant insulation layer comprises an eleventh region heat-resistant insulation layer (4282) located on an end face of the inner connecting part (23) towards the first pole output (1).

54. The battery secondary short-circuit prevention structure according to any one of claims 50-53, wherein The thickness of the sixth heat-resistant insulation layer (426) is greater than 0.01mm; And / or, the thickness of the seventh heat-resistant insulation layer (427) is greater than 0.01mm; And / or, the thickness of the eighth heat-resistant insulation layer is greater than 0.01mm.

55. The battery secondary short-circuit prevention structure according to any one of claims 50-53, characterized by The sixth heat-resistant insulation layer (426) is an aluminum oxide layer formed by electroplating; And / or, the seventh heat-resistant insulation layer (427) is an aluminum oxide layer formed by electroplating; And / or, the eighth heat-resistant insulation layer is an aluminum oxide layer formed by electroplating.

56. The battery secondary short-circuit prevention structure according to any one of claims 50-53, wherein The insulation sealing assembly (3) comprises an outer insulation ring (33) at least partially clamped between the riveting block (7) and the first pole output (1); And / or, the insulation sealing assembly (3) further comprises an inner insulation ring (32) located on a side of the first pole output (1) where the riveting block (7) is not arranged, and the inner insulation ring (32) is at least partially clamped between the second pole post (2) and the first pole output (1).

57. The battery secondary short-circuit prevention structure according to any one of claims 50-53, wherein The insulation sealing assembly (3) further comprises a sealing ring (31) sleeved on the second pole post (2), and the sealing ring (31) is at least partially clamped between the second pole post (2) and the inner wall of the first through hole (101).

58. The battery secondary short-circuit prevention structure according to any one of claims 50-53, wherein The first pole output (1) comprises a cover plate and a shell, and the second pole post (2) is inserted at the first through hole (101) of the cover plate or the second pole post (2) is inserted at the first through hole (101) of the shell.

59. The battery secondary short-circuit prevention structure according to claim 30, wherein The first pole output (1) has a riveting tubular structure (104) coaxially arranged with the first through hole (101) and surrounding the first through hole (101); The second pole post (2) comprises an annular protruding part (25) protruding in the radial direction of the second pole post (2), and an end of the second pole post (2) in the axial direction thereof is inserted at the first through hole (101), and an end face of the annular protruding part (25) towards the inside of the battery abuts against a first face (105) of the first pole output (1) located around the first through hole (101) and perpendicular to the axial direction of the second pole post (2), and the riveting tubular structure (104) is riveted and bent to cover the side face of the annular protruding part (25) and the end face of the annular protruding part (25) away from the inside of the battery. The heat-resistant insulation layer (42) comprises a ninth heat-resistant insulation layer (429) arranged on the side wall of the second electrode post (2) and / or a tenth heat-resistant insulation layer (430) arranged on the surface of the first electrode output (1) facing the second electrode post (2); The insulation sealing assembly (3) is at least partially sleeved on the side wall of the second electrode post (2), and is at least partially clamped between the second electrode post (2) and the first electrode output (1).

60. The battery secondary short-circuit prevention structure according to claim 59, wherein The ninth heat-resistant insulation layer (429) comprises a twelfth zone heat-resistant insulation layer (4291) located on the end surface of the annular protruding portion (25) facing the inside of the battery; And / or, the ninth heat-resistant insulation layer (429) comprises a thirteenth zone heat-resistant insulation layer (4292) located on the side surface of the annular protruding portion (25); And / or, the ninth heat-resistant insulation layer (429) comprises a fourteenth zone heat-resistant insulation layer (4293) located on the end surface of the annular protruding portion (25) away from the inside of the battery.

61. The battery secondary short-circuit prevention structure according to claim 59, wherein The second electrode post (2) comprises a first part (26) located at one end of the annular protruding portion (25) in the axial direction of the second electrode post (2), and the end surface of the first part is used for current conduction. The ninth heat-resistant insulation layer (429) comprises a fifteenth zone heat-resistant insulation layer (4294) located on the side wall of the first part. And / or, the second electrode post (2) comprises a second part (27) located at the other end of the annular protruding portion (25) in the axial direction of the second electrode post (2), and the end surface of the second part is used for current conduction. The ninth heat-resistant insulation layer (429) comprises a sixteenth zone heat-resistant insulation layer (4295) located on the side wall of the second part.

62. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The tenth heat-resistant insulation layer (430) comprises a seventeenth zone heat-resistant insulation layer (4301) located on the inner wall of the riveted tubular structure (104); And / or, the tenth heat-resistant insulation layer (430) comprises an eighteenth zone heat-resistant insulation layer (4302) located on the first surface (105); And / or, the tenth heat-resistant insulation layer (430) comprises a nineteenth zone heat-resistant insulation layer (4303) located on the inner wall of the first through hole (101); And / or, the tenth heat-resistant insulation layer (430) comprises a twentieth region heat-resistant insulation layer (4304) located on a second surface (106) of the first pole output (1) located around the first through hole (101) and perpendicular to the axial direction of the second pole post (2), the second surface (106) being opposite to the first surface (105).

63. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The thickness of the ninth heat-resistant insulation layer (429) is greater than 0.01 mm, and / or the thickness of the tenth heat-resistant insulation layer (430) is greater than 0.01 mm.

64. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The ninth heat-resistant insulation layer (429) is an electroplated aluminum oxide layer, and / or the tenth heat-resistant insulation layer (430) is an electroplated aluminum oxide layer.

65. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The insulation sealing assembly (3) comprises an outer insulation ring (33) sleeved on the second pole post (2), and the outer insulation ring (33) is at least partially clamped between the second pole post (2) and the riveted tubular structure (104).

66. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The insulation sealing assembly (3) further comprises a sealing ring (31) sleeved on the second pole post (2), and the sealing ring (31) is partially clamped between the second pole post (2) and the inner wall of the first through hole (101).

67. The battery secondary short-circuit prevention structure according to any one of claims 59-61, wherein The first pole output (1) comprises a cover plate and a shell, and the second pole post (2) is inserted into the first through hole (101) of the cover plate or the shell.

68. A battery comprising a battery cell (200) and the battery secondary short circuit prevention structure according to any one of claims 1-67, wherein the battery cell (200) is located in the first pole output (1) of the battery secondary short circuit prevention structure.

Images