Battery

Abstract

The utility model provides a battery. The battery comprises a shell and a battery cell positioned in the shell, the battery cell comprises a first tab and a second tab; a first pole is arranged on the shell, and the first pole and the shell are arranged in an insulating manner; the first tab is connected with the first pole, and the second tab is connected with the shell; and a trigger structure is arranged between the first pole and the shell, so that the first pole is electrically conducted with the shell when the temperature of the battery cell is greater than or equal to the preset temperature, and risks such as thermal runaway caused by continuous rising of the temperature of the battery cell are avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, concretely relates to a battery. BACKGROUND

[0002] Battery, such as lithium ion battery, due to its high energy density, environmental protection low pollution and so on, in mobile phone, panel, notebook computer etc. Portable electronic equipment is widely used.

[0003] Battery cell is the core component of battery, and battery cell will continuously generate heat under high temperature and other conditions, and the heat inside battery cell continuously accumulates, which can cause battery cell to appear thermal runaway phenomenon, and further cause fire risk and the like. UTILITY MODEL CONTENT

[0004] Therefore, the utility model embodiment is dedicated to providing a battery to improve the risk of thermal runaway inside the battery cell to some extent.

[0005] The utility model provides a kind of battery, including shell and the battery cell in the shell;

[0006] The battery cell includes first tab and second tab;

[0007] The shell is provided with first pole, and the first pole and the shell are insulated;

[0008] The first tab is connected with the first pole, and the second tab is connected with the shell;

[0009] The first pole and the shell are provided with trigger structure, so that the first pole is electrically conducted with the shell when the temperature of the battery cell is greater than or equal to preset temperature.

[0010] Optionally, the trigger structure includes insulating support body and negative temperature coefficient thermistor;

[0011] The insulating support body is supported between the first pole and the shell;

[0012] One end of the negative temperature coefficient thermistor is connected with the first pole, and the other end of the negative temperature coefficient thermistor is connected with the shell, so that the first pole is electrically conducted with the shell through the negative temperature coefficient thermistor when the temperature of the battery cell is greater than or equal to the preset temperature.

[0013] Optionally, at least part of the negative temperature coefficient thermistor is embedded in the insulating support body;

[0014] And / or, at least two negative temperature coefficient thermistors are provided between the first pole and the shell, and the at least two negative temperature coefficient thermistors are connected in parallel.

[0015] And / or, one end of the negative temperature coefficient thermistor is welded to the first pole, and the other end of the negative temperature coefficient thermistor is welded to the shell.

[0016] Optionally, the first pole includes a first conductive part, a conductive connecting part and a second conductive part connected in sequence; the shell is provided with a through hole, the first conductive part is located outside the shell, the conductive connecting part is arranged in the through hole, and the second conductive part is located inside the shell.

[0017] The negative temperature coefficient thermistor is connected between the outer wall of the shell and the first conductive part.

[0018] Alternatively, the negative temperature coefficient thermistor is connected between the conductive connecting part and the hole wall of the through hole.

[0019] Alternatively, the negative temperature coefficient thermistor is connected between the inner wall of the shell and the second conductive part.

[0020] Alternatively, the shell is provided with a second pole, the second tab is connected to the shell through the second pole, and the negative temperature coefficient thermistor is connected between the second conductive part and the second pole.

[0021] Optionally, the trigger structure includes a meltable insulator arranged between the first pole and the shell.

[0022] The meltable insulator melts when the temperature of the battery cell is greater than or equal to the preset temperature, so that the first pole and the shell are in contact and conductive.

[0023] Optionally, the first pole includes a first conductive part located outside the shell and a second conductive part located inside the shell, and the first conductive part and the second conductive part are electrically connected.

[0024] At least part of the meltable insulator is arranged between the first conductive part and the outer wall of the shell, and / or at least part of the meltable insulator is arranged between the second conductive part and the inner wall of the shell.

[0025] Optionally, the first conductive part and the second conductive part are electrically connected through an elastic conductive piece, the shell is provided with a through hole, the elastic conductive piece is arranged in the through hole, and the shell is insulated.

[0026] And / or, the thickness of the meltable insulator between the first conductive part and the outer wall of the shell in the first direction ranges from 0.2mm to 0.6mm.

[0027] And / or, the thickness of the meltable insulator between the second conductive part and the inner wall of the shell in the first direction ranges from 0.2mm to 0.6mm.

[0028] Optionally, at least one first conductive protrusion extending towards the shell is arranged on the side of the first pole facing the shell.

[0029] And / or, at least one second conductive protrusion extending towards the first pole is arranged on the shell.

[0030] Optionally, at least one first conductive protrusion and at least one second conductive protrusion are arranged correspondingly, and the projection of the corresponding first conductive protrusion and second conductive protrusion in the second direction has an overlapping part.

[0031] And / or, the width of the first conductive protrusion gradually decreases in the direction towards the shell.

[0032] And / or, the width of the second conductive protrusion gradually decreases in the direction towards the first pole.

[0033] Optionally, the material of the meltable insulator is selected from one of polypropylene, polyimide and polymethyl methacrylate.

[0034] Optionally, the preset temperature is not less than 100℃.

[0035] And / or, the shell is a steel shell.

[0036] The battery provided by the utility model has the following advantages: by arranging the first pole on the shell, the first pole and the shell are insulated, the first pole ear is connected with the first pole, the second pole ear is connected with the shell, and the trigger structure is arranged between the first pole and the shell, so that when the temperature of the battery cell is greater than or equal to the preset temperature, the first pole and the shell are electrically conducted, that is, when the battery is normally working, the first pole and the shell are insulated, and the two cannot conduct electricity, and when the temperature of the battery cell is greater than or equal to the preset temperature, the trigger structure triggers the conduction between the first pole and the shell, that is, the battery is externally short-circuited, so that the battery cell can release the charge energy in time through the external short-circuit, and the risk of thermal runaway caused by the continuous increase of the temperature of the battery cell is avoided, and the safety performance of the battery and the thermal abuse passing rate of the battery are improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 The structure diagram of the battery in an embodiment of the utility model Figure 1 ;

[0038] Figure 2 The structure diagram of the battery in an embodiment of the utility modelFigure 1 Enlarged view of the local structure in

[0039] Figure 3 Structure diagram of the battery according to an embodiment of the present application Figure 2 ;

[0040] Figure 4 Structure diagram of the battery according to an embodiment of the present application Figure 3 ;

[0041] Figure 5 Structure diagram of the battery according to an embodiment of the present application Figure 4 ;

[0042] Figure 6 Structure diagram of the battery according to an embodiment of the present application Figure 5 ;

[0043] Figure 7 Structure diagram of the battery according to an embodiment of the present application Figure 6 ;

[0044] Figure 8 Structure diagram of the battery according to an embodiment of the present application Figure 7 ;

[0045] Figure 9 Structure diagram of the battery according to an embodiment of the present application Figure 8 ;

[0046] Figure 10 Structure diagram of the battery according to an embodiment of the present application Figure 8 ;

[0047] Figure 11 Enlarged view of the local structure in Figure 10 .

[0048] 1, housing; 10, through hole; 11, second conductive protrusion; 2, battery cell; 3, first pole; 31, first conductive part; 32, second conductive part; 33, conductive connecting part; 30, first conductive protrusion; 4, second pole; 5, trigger structure; 51, negative temperature coefficient thermistor; 52, insulating support; 53, wire; 6, elastic conductive piece. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application belong to the scope of protection of the present application.

[0050] The battery includes a shell and a battery cell, the battery cell is located in the shell, the battery cell continuously generates heat under high temperature and the like, which causes the heat inside the battery cell to continuously accumulate, which can cause the battery cell to have a thermal runaway phenomenon, thereby causing a fire, explosion and the like.

[0051] Based on this, the utility model provides a kind of battery, by making the insulation between the first pole post on shell and shell, and setting trigger structure between the first pole post and shell, to make the first pole post and shell electrically conductive when battery cell temperature greater than or equal to preset temperature, namely, the insulation between the first pole post and shell when battery normal work, to ensure that battery normal work, and when battery cell temperature greater than or equal to preset temperature, trigger structure triggers the conduction between the first pole post and shell, makes battery external short circuit, battery stops working, by external short circuit and timely release battery cell energy, avoid the heat accumulation inside battery cell and cause thermal runaway situation to appear, so that the heat runaway risk inside battery cell can be effectively improved.

[0052] The battery provided by the utility model will be described in detail in combination with the drawings and specific embodiments as follows:

[0053] Referring to Figures 1 to 11 The battery provided by the embodiment can be a lithium ion battery.

[0054] The battery can be used as a power supply or energy storage unit of an electronic device. The electronic device can be, but is not limited to, a mobile device (such as a mobile phone, a notebook computer, a tablet computer, etc.), an electric vehicle (such as a pure electric vehicle, a hybrid electric vehicle, an electric bicycle, etc.).

[0055] The battery provided by the embodiment includes a shell 1 and a battery cell 2 located in the shell 1.

[0056] The battery cell 2 includes a first tab and a second tab. The shell 1 is provided with a first pole post 3, and the first pole post 3 is insulated from the shell 1. The first tab is connected to the first pole post 3, and the second tab is connected to the shell 1.

[0057] For example, the battery cell 2 can include a first pole piece, a second pole piece and a separator, the separator is located between the first pole piece and the second pole piece, and is used to isolate the first pole piece and the second pole piece from contacting each other. The first pole piece is provided with a first tab, and the second pole piece is provided with a second tab. For example, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, and the first pole post 3 is a positive pole post.

[0058] Of course, in other implementations, the first pole piece can also be a negative pole piece, the second pole piece can be a positive pole piece, and the first pole post 3 can be a negative pole post.

[0059] The electric core 2 can be a winding type electric core, i.e., a first pole piece, a diaphragm and a second pole piece are laminated and wound to form a winding type electric core.

[0060] For example, an insulating layer can be arranged between the first pole 3 and the shell 1 to insulate the first pole 3 from the shell 1. For example, the shell 1 can be a metal shell, such as a steel shell. When the shell 1 is a steel shell, the battery can be a cylindrical lithium ion battery. The steel shell can also disperse heat when the temperature of the electric core 2 is high.

[0061] The first pole 3 and the shell 1 are provided with a trigger structure 5 to electrically connect the first pole 3 and the shell 1 when the temperature of the electric core 2 is greater than or equal to a preset temperature.

[0062] That is, when the battery is working normally, i.e., when the temperature of the electric core 2 is less than the preset temperature, the first pole 3 and the shell 1 are insulated to ensure normal operation of the battery. When the temperature of the electric core 2 is greater than or equal to the preset temperature, the trigger structure 5 triggers the electrical connection between the first pole 3 and the shell 1, i.e., when the temperature reaches or is higher than the preset temperature, the electrical connection between the first pole 3 and the shell 1 causes the battery to be externally short-circuited, i.e., the short-circuit point or source is external, so that the short-circuit point or source is not inside the electric core 2, thereby releasing the energy of the electric core 2 in time through external short-circuit, i.e., the energy of the electric core 2 is released through external short-circuit, thereby avoiding the continuous heat accumulation inside the electric core 2 and the occurrence of thermal runaway.

[0063] The preset temperature is not greater than the temperature at which the battery initially experiences thermal runaway. For example, the preset temperature can be the temperature of the battery before or just before the initial thermal runaway, and if the charge energy of the electric core 2 is not released in time, the temperature of the battery will continue to rise and the battery will experience thermal runaway.

[0064] For example, the preset temperature is not less than 100°C. For example, it can be 100°C, 105°C, 110°C, 115°C or 120°C.

[0065] The battery provided in this embodiment is provided with a first electrode 3 on the shell 1, so that the first electrode 3 and the shell 1 are insulated, the first electrode tab is connected to the first electrode 3, and the second electrode tab is connected to the shell 1, and a trigger structure 5 is provided between the first electrode 3 and the shell 1, so that the first electrode 3 and the shell 1 are electrically conductive when the temperature of the battery cell 2 is greater than or equal to a preset temperature. That is, when the battery is operating normally, the first electrode 3 and the shell 1 are insulated and the two are not conductive. When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the trigger structure 5 triggers the conduction between the first electrode 3 and the shell 1, that is, an external short circuit occurs in the battery, so that the battery cell 2 can release the charged energy in time through the external short circuit, thereby avoiding the risk of thermal runaway caused by the continued increase in the temperature of the battery cell 2, and improving the safety performance of the battery and the thermal abuse pass rate of the battery.

[0066] Reference Figures 1 to 7 As shown, in some embodiments, the trigger structure 5 may specifically include: an insulating support 52 and a negative temperature coefficient thermistor 51 (Negative Temperature Coefficient thermistor, abbreviated as NTC).

[0067] Among them, the insulating support body 52 is supported between the first pole 3 and the shell 1, one end of the negative temperature coefficient thermistor 51 is connected to the first pole 3, and the other end of the negative temperature coefficient thermistor 51 is connected to the shell 1, so that the first pole 3 is electrically connected to the shell 1 through the negative temperature coefficient thermistor 51 when the temperature of the battery cell 2 is greater than or equal to the preset temperature.

[0068] The insulating support 52 not only insulates the first pole 3 and the shell 1 when the battery is working normally, but also supports the first pole 3 and the shell 1, thereby improving the stability of the overall structure.

[0069] For example, the insulating support 52 can be made of a material that is not meltable at high temperatures, such as resin or silicone. Of course, the insulating support 52 can also be made of a material such as polypropylene (PP).

[0070] The resistance value of the negative temperature coefficient thermistor 51 is negatively correlated with temperature. When the battery is normally working (when the temperature is lower than the preset temperature), the negative temperature coefficient thermistor 51 has a large resistance, for example, can reach 1MΩ or above. The negative temperature coefficient thermistor 51 is connected between the first pole 3 and the shell 1, and is equivalent to an insulator. The first pole 3 and the shell 1 are not conductive, and will not form a short circuit, and will not affect the normal use of the battery. When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the resistance of the negative temperature coefficient thermistor 51 drops sharply, for example, can be sharply reduced to 10Ω or below, and becomes a good conductor. At this time, the first pole 3 and the shell 1 are conductive, and the battery cell 2 can release the charge energy in time through the external short circuit, thereby avoiding the risk of thermal runaway caused by the continuous temperature rise of the battery cell 2.

[0071] In some embodiments, one end of the negative temperature coefficient thermistor 51 can be welded to the first pole 3, and the other end of the negative temperature coefficient thermistor 51 can be welded to the shell 1.

[0072] By welding, the stability and reliability of the connection between the negative temperature coefficient thermistor 51 and the first pole 3 and the shell 1 are improved, thereby ensuring that the first pole 3 is reliably conductive between the negative temperature coefficient thermistor 51 and the shell 1 when the temperature of the battery cell 2 is greater than or equal to the preset temperature. Moreover, compared with the connection by wire, the welding method can further save space, which is conducive to the optimization design of the battery structure.

[0073] In some embodiments, at least part of the negative temperature coefficient thermistor 51 can be embedded in the insulating support 52.

[0074] For example, the negative temperature coefficient thermistor 51 is embedded in the insulating support 52, one end of the negative temperature coefficient thermistor 51 is welded to the first pole 3, and the other end of the negative temperature coefficient thermistor 51 is welded to the shell 1.

[0075] In this way, on the basis of ensuring that the first pole 3 can be electrically conductive between the negative temperature coefficient thermistor 51 and the shell 1 when the temperature of the battery cell 2 is greater than or equal to the preset temperature, the insulating support 52 also plays a role in protecting the negative temperature coefficient thermistor 51 to some extent, and the stability of the negative temperature coefficient thermistor 51 is improved. In addition, this arrangement can also save space to some extent, improve the compactness of the overall structure, and is conducive to the optimization design of the battery structure.

[0076] Of course, in other implementations, the negative temperature coefficient thermistor 51 can also be arranged outside the insulating support 52.

[0077] In some embodiments, the first pole 3 comprises a first conductive part 31, a conductive connecting part 33 and a second conductive part 32 connected in sequence.

[0078] The shell 1 is provided with a through hole 10, the first conductive part 31 is located outside the shell 1, the conductive connecting part 33 is arranged in the through hole 10, and the second conductive part 32 is located inside the shell 1. For example, the first conductive part 31 can be electrically connected with an external electrical equipment, and the second conductive part 32 can be connected with a tab of the battery cell 2. When the first pole 3 is a positive pole, the second conductive part 32 is connected with a positive tab.

[0079] Referring to FIGS. 1, 2 and 3, Figure 1 and Figure 2 In some embodiments, the negative temperature coefficient thermistor 51 is specifically connected between the outer wall of the shell 1 and the first conductive part 31.

[0080] When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the resistance of the negative temperature coefficient thermistor 51 drops sharply, and the first conductive part 31 is electrically connected with the shell 1, that is, the first pole 3 is electrically connected with the shell 1.

[0081] By arranging the negative temperature coefficient thermistor 51 outside the shell 1, the risk of thermal runaway is improved, and the negative temperature coefficient thermistor 51 does not occupy the internal space of the shell 1, which is beneficial to the optimization design of the battery cell 2, and further beneficial to the improvement of the energy density of the battery cell 2.

[0082] Referring to FIGS. 1, 2 and 3, Figure 3 In some embodiments, the negative temperature coefficient thermistor 51 is specifically connected between the conductive connecting part 33 and the hole wall of the through hole 10.

[0083] When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the conductive connecting part 33 is electrically connected with the hole wall of the through hole 10 through the negative temperature coefficient thermistor 51, that is, the first pole 3 is electrically connected with the shell 1. Moreover, such an arrangement does not affect the internal space of the shell 1, which is beneficial to the optimization design of the battery structure and the improvement of the energy density of the battery cell, and does not affect the external space of the shell 1, for example, there is no need to adjust or improve the electrical equipment due to space problems.

[0084] Referring to FIGS. 1, 2 and 3, Figure 4 and Figure 5 In some embodiments, the negative temperature coefficient thermistor 51 is specifically connected between the inner wall of the shell 1 and the second conductive part 32.

[0085] By arranging the negative temperature coefficient thermistor 51 inside the shell 1, the risk of thermal runaway is improved, and the external space of the shell 1 is not affected, for example, there is no need to adjust or improve the electrical equipment due to external space problems.

[0086] In one possible implementation, continuing to refer to Figure 4 As shown in FIG. 5, one end of the negative temperature coefficient thermistor 51 is connected to the side of the second conductive part 32 facing the shell 1, and the other end of the negative temperature coefficient thermistor 51 is connected to the inner wall of the shell 1.

[0087] For example, the negative temperature coefficient thermistor 51 is welded between the inner wall of the shell 1 and the side of the second conductive part 32 facing the shell 1.

[0088] In another possible implementation, continuing to refer to Figure 5 As shown in FIG. 6, the negative temperature coefficient thermistor 51 is arranged in the shell 1 and located beside the second conductive part 32.

[0089] For example, one end of the negative temperature coefficient thermistor 51 is welded to the inner wall of the shell 1, and the other end of the negative temperature coefficient thermistor 51 is connected to the second conductive part 32 through the wire 53.

[0090] In this way, the assembly of the negative temperature coefficient thermistor 51 and the insulating support 52 does not interfere with each other, and the two can be assembled separately.

[0091] Of course, in this implementation, one end of the negative temperature coefficient thermistor 51 can also be connected to the inner wall of the shell 1 through a wire, and the other end of the negative temperature coefficient thermistor 51 can also be welded to the second conductive part 32.

[0092] In some embodiments, the shell 1 is provided with a second pole 4, and the second tab is connected to the second pole 4, and the second pole 4 is connected to the shell 1, that is, the second tab is connected to the shell 1 through the second pole 4. For example, the first pole 3 is a positive pole, and the second pole 4 is a negative pole.

[0093] Referring to Figure 6 As shown in FIG. 5, in some embodiments, the negative temperature coefficient thermistor 51 is connected between the second conductive part 32 and the second pole 4.

[0094] By connecting the negative temperature coefficient thermistor 51 between the second conductive part 32 and the second pole 4, when the temperature of the battery cell 2 is greater than or equal to the preset temperature, the second conductive part 32 is electrically connected between the negative temperature coefficient thermistor 51 and the second pole 4, and since the second pole 4 is electrically connected to the shell 1, at this time, the first pole 3 and the shell 1 are electrically connected through the negative temperature coefficient thermistor 51, thereby forming an external short circuit between the first pole 3, the second pole 4 and the shell 1, so that the battery cell 2 releases the charge energy in time through the external short circuit, thereby avoiding the risk of thermal runaway caused by the continuous temperature rise of the battery cell 2.

[0095] By arranging the negative temperature coefficient thermistor 51 in the housing 1, the risk of thermal runaway is improved without affecting the external space of the housing 1, such as not needing to adjust or improve the electrical equipment due to the external space.

[0096] For example, one end of the negative temperature coefficient thermistor 51 can be electrically connected to the second conductive part 32 through a wire 53, and the other end of the negative temperature coefficient thermistor 51 can be electrically connected to the second pole 4 through a wire 53.

[0097] Referring to Figure 7 In some embodiments, at least two negative temperature coefficient thermistors 51 are arranged between the first pole 3 and the housing 1, and the at least two negative temperature coefficient thermistors 51 are arranged in parallel.

[0098] By arranging at least two negative temperature coefficient thermistors 51, when one or some of the negative temperature coefficient thermistors 51 fail or are damaged, the electrical conduction between the first pole 3 and the housing 1 can be achieved by the other one or some of the negative temperature coefficient thermistors 51 when the temperature of the battery cell 2 is greater than or equal to the preset temperature, thereby further ensuring that the first pole 3 and the housing 1 can be normally conducted when the temperature of the battery cell 2 is high to form an external short circuit, further avoiding the risk of thermal runaway of the battery cell 2, and further improving the safety performance of the battery and the thermal abuse pass rate of the battery.

[0099] Referring to Figures 8 to 11 In some embodiments, the trigger structure 5 includes a fusible insulator arranged between the first pole 3 and the housing 1. When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the fusible insulator melts to make the first pole 3 and the housing 1 contact and conduct.

[0100] It can be understood that using a fusible insulator as a starting element of the external short circuit of the battery can melt when the temperature of the battery cell 2 is greater than or equal to the preset temperature to quickly and reliably achieve the external short circuit of the battery, thereby effectively avoiding the risk of thermal runaway of the battery cell 2 to improve safety.

[0101] Specifically, when the battery is working normally, the fusible insulator does not melt, which serves to insulate the first pole 3 and the housing 1 to ensure that the two do not contact. When the temperature of the battery cell 2 is greater than or equal to the preset temperature, i.e., before the battery experiences thermal runaway, the fusible insulator melts, thereby causing the first pole 3 and the housing 1 to contact and short circuit, causing the voltage to drop rapidly, the battery to stop working, and the heat generation to be reduced, thereby effectively avoiding the phenomenon of thermal runaway of the battery in a high-temperature environment and improving the overall safety of the battery.

[0102] Exemplarily, the material of the fusible insulator is selected from one of polypropylene (PP), polyimide (PI), and polymethyl methacrylate (PMMA).

[0103] In this way, the effective melting of the fusible insulator when the temperature is greater than or equal to the preset temperature can be further ensured, and the first pole 3 is in contact with the shell 1 in time.

[0104] Continuing to refer to FIGS. 1 and 2, Figure 8 and Figure 9 The first pole 3 specifically can include a first conductive part 31 located outside the shell 1 and a second conductive part 32 located inside the shell 1, and the first conductive part 31 and the second conductive part 32 are electrically connected.

[0105] At least part of the fusible insulator is arranged between the first conductive part 31 and the outer wall of the shell 1, and / or at least part of the fusible insulator is arranged between the second conductive part 32 and the inner wall of the shell 1.

[0106] Exemplarily, referring to FIGS. 1 and 2, Figure 8 and Figure 9 In some implementations, part of the fusible insulator is arranged between the first conductive part 31 and the outer wall of the shell 1, and part of the fusible insulator is arranged between the second conductive part 32 and the inner wall of the shell 1. Referring to FIG. 2, Figure 8 When the battery is working normally, the fusible insulator between the first conductive part 31 and the outer wall of the shell 1 serves to separate the first conductive part 31 and the shell 1, and the fusible insulator between the second conductive part 32 and the inner wall of the shell 1 serves to separate the second conductive part 32 and the shell 1. Referring to FIG. 2, Figure 9 When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the fusible insulator between the first conductive part 31 and the outer wall of the shell 1 melts and flows outward, the first conductive part 31 approaches the shell 1 and is in contact with the shell 1. The fusible insulator between the second conductive part 32 and the inner wall of the shell 1 melts and flows outward, the second conductive part 32 approaches the shell 1 and is in contact with the shell 1, so that the first pole 3 is in contact with the shell 1, an external short circuit is formed, and the risk of thermal runaway caused by the continuous increase of the temperature of the battery cell 2 is effectively avoided.

[0107] Moreover, in this way, no matter which one of the first conductive part 31 and the second conductive part 32 first comes into contact with the shell 1, the electrical conduction between the first pole 3 and the shell 1 can be achieved, so that the timeliness of triggering the external short circuit is further improved, and the occurrence of thermal failure is avoided in time.

[0108] In some embodiments, the first conductive part 31 and the second conductive part 32 are provided with an elastic conductive piece 6, and the first conductive part 31 and the second conductive part 32 are electrically connected through the elastic conductive piece 6.

[0109] In some embodiments, the first conductive part 31 and the second conductive part 32 are provided with an elastic conductive piece 6, and the first conductive part 31 and the second conductive part 32 are electrically connected through the elastic conductive piece 6.

[0110] Specifically, the shell 1 is provided with a through hole 10, and the elastic conductive piece 6 is arranged in the through hole 10 and insulated from the shell 1.

[0111] It can be understood that the first conductive part 31 and the second conductive part 32 are connected through the elastic conductive piece 6, and when the fusible insulation melts, the elastic conductive piece 6 can freely contract and elastically recover.

[0112] By arranging the elastic conductive piece 6 between the first conductive part 31 and the second conductive part 32, on the basis of realizing the electrical connection of the first conductive part 31 and the second conductive part 32, when the fusible insulation melts, the elastic conductive piece 6 can drive the first conductive part 31 and the second conductive part 32, so that the first conductive part 31 and the second conductive part 32 can approach each other under the elastic restoring force of the elastic conductive piece 6, so that the first conductive part 31 and the shell 1, and the second conductive part 32 and the shell 1 can quickly contact, ensuring the timeliness of the external short-circuit triggering, further avoiding the occurrence of thermal runaway risk in time, and further improving the safety.

[0113] With reference to the foregoing Figure 8 and Figure 9As shown, the first conductive part 31 is provided with a fusible insulator between the outer wall of the shell 1, the second conductive part 32 is provided with a fusible insulator between the inner wall of the shell 1, and the elastic conductive part 6 is provided with a fusible insulator between the hole wall of the through hole 10, so that better insulation and sealing can be achieved. Under normal circumstances, the first pole 3 is insulated from the shell 1, when the temperature is greater than or equal to the preset temperature, the fusible insulator melts, the battery internal gas is discharged, at the same time, the first conductive part 31 and the second conductive part 32 are pulled together by the elastic conductive part 6, and are close to each other and in contact with the shell 1, thereby triggering the external short circuit.

[0114] The elastic conductive part 6 can be a spring made of conductive material. Of course, the elastic conductive part 6 can also be a conductive elastic strip, and the embodiment is not limited thereto.

[0115] In addition, in other implementations, the first conductive part 31 and the second conductive part 32 can also not be provided with the elastic conductive part 6, for example, the first conductive part 31 and the second conductive part 32 are electrically connected by a deformable wire, and after the fusible insulator melts, the first conductive part 31 and the second conductive part 32 move towards each other.

[0116] In addition, the first conductive part 31 and the second conductive part 32 can also be provided with a magnetic attraction structure, for example, the first conductive part 31 and the second conductive part 32 are connected by a deformable wire, a first magnetic body is arranged on the first conductive part 31, and a second magnetic body is arranged on the second conductive part 32. The first magnetic body and the second magnetic body have different magnetic properties. When the battery is working normally, the fusible insulator does not melt, and is supported between the first pole 3 and the shell 1 to separate the first pole 3 and the shell 1. At this time, the first conductive part 31 and the second conductive part 32 cannot move. When the temperature of the battery cell 2 is greater than or equal to the preset temperature, the fusible insulator melts, and the melted insulator flows from the position between the first pole 3 and the shell 1 to the outside. At this time, the first conductive part 31 and the second conductive part 32 move towards each other under the adsorption of the magnetic force, so that the first conductive part 31 is in contact with the shell 1 and conducts, and the second conductive part 32 is in contact with the shell 1 and conducts.

[0117] Referring to Figure 10 and Figure 11 In some embodiments, at least one first conductive protrusion 30 extending towards the shell 1 is arranged on the side of the first pole 3 facing the shell 1.

[0118] For example, the side of the first conductive part 31 facing the shell 1 (for example, the side of the first conductive part 31 facing the shell 1 in the direction of the arrow A1 in FIG. 6) is provided with at least one first conductive protrusion 30 extending towards the shell 1. Figure 10 and Figure 11For example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1; for another example, the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1; for yet another example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1, and the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1. Figure 10 For example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1; for another example, the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1; for yet another example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1, and the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1. Figure 11 For example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1; for another example, the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1; for yet another example, the first conductive part 31 is provided with the first conductive protrusion 30 on the side facing the shell 1, and the second conductive part 32 is provided with the first conductive protrusion 30 on the side facing the shell 1.

[0119] It can be understood that the first conductive protrusion 30 is not in contact with the shell 1 when the battery is working normally.

[0120] By providing the first conductive protrusion 30 between the first pole 3 and the shell 1, when the temperature of the battery cell 2 is greater than or equal to the preset temperature and the fusible insulator melts, the first pole 3 can be in contact with the shell 1 through the first conductive protrusion 30, thereby improving the timeliness of the external short circuit trigger and effectively avoiding the risk of thermal runaway caused by the continuous temperature rise of the battery cell 2.

[0121] In specific implementation, a plurality of first conductive protrusions 30 can be provided on the first pole 3, so that any one of the first conductive protrusions 30 is in contact with the shell 1 to realize the electrical conduction between the first pole 3 and the shell 1, thereby further improving the reliability and timeliness of the external short circuit trigger.

[0122] Continuing to refer to the shell 1 shown in Figure 10 For example, the shell 1 is provided with at least one second conductive protrusion 11 extending towards the direction close to the first pole 3. Figure 11 For example, the shell 1 is provided with at least one second conductive protrusion 11 extending towards the direction close to the first pole 3.

[0123] For example, the shell 1 is provided with at least one second conductive protrusion 11 extending towards the direction close to the first pole 3.

[0124] It can be understood that the second conductive protrusion 11 is not in contact with the first pole 3 when the battery is working normally.

[0125] By providing the second conductive protrusion 11 between the first pole 3 and the shell 1, when the temperature of the battery cell 2 is greater than or equal to the preset temperature and the fusible insulator melts, the first pole 3 can be in contact with the shell 1 through the second conductive protrusion 11, thereby improving the timeliness of the external short circuit trigger and effectively avoiding the risk of thermal runaway caused by the continuous temperature rise of the battery cell 2.

[0126] In specific implementation, a plurality of second conductive protrusions 11 can be arranged on the shell 1, so that any second conductive protrusion 11 can be in contact with the first pole 3 to realize the electrical conduction between the first pole 3 and the shell 1, thereby further improving the reliability and timeliness of the external short-circuit triggering.

[0127] With reference to Figure 10 and Figure 11 , in some embodiments, the first pole 3 is provided with a first conductive protrusion 30, and the shell 1 is provided with a second conductive protrusion 11.

[0128] In some embodiments, at least one first conductive protrusion 30 and at least one second conductive protrusion 11 can be arranged correspondingly, and the projections of the corresponding first conductive protrusion 30 and second conductive protrusion 11 in the second direction have overlapping parts.

[0129] It can be understood that, when the battery is working normally, the first conductive protrusion 30 and the second conductive protrusion 11 are not in contact.

[0130] Here, the second direction can be, for example, the left-right direction in Figure 11 , for example, the width direction of the battery.

[0131] Such arrangement makes the first pole 3 move towards the shell 1 when the fusible insulator melts at the temperature of the battery cell 2 greater than or equal to the preset temperature, and the first conductive protrusion 30 quickly contacts and conducts with the corresponding second conductive protrusion 11, that is, the first pole 3 and the shell 1 are electrically conducted, thereby further improving the timeliness of the external short-circuit triggering, so that the external short-circuit can be started more quickly at a higher temperature, thereby more timely and effectively avoiding the occurrence of thermal runaway risk, and further improving the safety of the battery.

[0132] In specific implementation, for example, the first conductive protrusion 30 can be integrally formed with the first pole 3, and the second conductive protrusion 11 can be integrally formed with the shell 1, which can improve the stability of the overall structure and further ensure the reliability of the external short-circuit triggering.

[0133] For example, the first conductive protrusion 30 and the second conductive protrusion 11 can be embedded in the fusible insulator, and when the temperature is lower than the preset temperature, the first conductive protrusion 30 and the second conductive protrusion 11 are not in contact under the support of the fusible insulator, and when the temperature is higher than or equal to the preset temperature, the first conductive protrusion 30 and the second conductive protrusion 11 are in contact and conducted with each other as the fusible insulator melts, thereby realizing the electrical conduction between the first pole 3 and the shell 1.

[0134] With reference to Figure 11As shown, in some embodiments, the width of the first conductive protrusion 30 gradually decreases in the direction approaching the shell 1. The width of the first conductive protrusion 30 here can be specifically Figure 11 The width of the first conductive protrusion 30 in the left-right direction in

[0135] Specifically, in the direction from top to bottom, the width of the first conductive protrusion 30 on the side of the first conductive portion 31 facing the shell 1 gradually decreases. In the direction from bottom to top, the width of the first conductive protrusion 30 on the side of the second conductive portion 32 facing the shell 1 gradually decreases.

[0136] Such arrangement makes the first conductive portion 31 and / or the second conductive portion 32, when moving towards the shell 1, experience less resistance from the first conductive protrusion 30, and can more quickly make contact with the shell 1 or the second conductive protrusion 11 to conduct, thereby further improving the timeliness of the external short-circuit triggering, and in turn effectively avoiding the risk of thermal runaway of the battery.

[0137] For example, the cross section of the first conductive protrusion 30 can be triangular in structure, further reducing the resistance experienced by the first conductive protrusion 30 when moving when the fusible insulator melts.

[0138] Continuing to refer to Figure 11 As shown, in some embodiments, the width of the second conductive protrusion 11 gradually decreases in the direction approaching the first pole 3.

[0139] The width of the second conductive protrusion 11 here can be specifically Figure 11 The width of the second conductive protrusion 11 in the left-right direction in

[0140] Specifically, in the direction from bottom to top, the width of the second conductive protrusion 11 on the outer wall of the shell 1 gradually decreases. In the direction from top to bottom, the width of the second conductive protrusion 11 on the inner wall of the shell 1 gradually decreases.

[0141] For example, the cross section of the second conductive protrusion 11 can be triangular in structure.

[0142] In actual implementation, if the thickness of the fusible insulator in the first direction is too thick, it will take a long time for the process from the start of the melting of the fusible insulator to the contact of the first pole 3 with the shell 1, resulting in the triggering of the external short-circuit not being timely enough, but if the thickness of the fusible insulator in the first direction is too small, it will affect the good insulation between the first pole 3 and the shell 1 when the battery is working normally.

[0143] Based on this, referring to Figure 11In some embodiments, the thickness h of the meltable insulation between the first conductive part 31 and the outer wall of the shell 1 in the first direction can be in the range of 0.2mm to 0.6mm.

[0144] The first direction can be ​ The first direction can be the up-down direction as shown in the middle, for example, the length direction of the battery cell 2. For example, the thickness h of the meltable insulation between the first conductive part 31 and the outer wall of the shell 1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, or 0.6mm.

[0145] By setting the thickness of the meltable insulation between the first conductive part 31 and the outer wall of the shell 1 in the above range, not only is the good insulation between the first pole 3 and the shell 1 when the battery is working normally guaranteed, but also when the temperature of the battery cell 2 is greater than or equal to the preset temperature, the meltable insulation melts, allowing the first conductive part 31 to quickly contact the outer wall of the shell 1, improving the timeliness of the external short circuit trigger.

[0146] In some embodiments, the thickness h of the meltable insulation between the second conductive part 32 and the inner wall of the shell 1 in the first direction can be in the range of 0.2mm to 0.6mm. For example, the thickness h of the meltable insulation between the second conductive part 32 and the inner wall of the shell 1 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, or 0.6mm.

[0147] By setting the thickness of the meltable insulation between the second conductive part 32 and the inner wall of the shell 1 in the above range, not only is the good insulation between the first pole 3 and the shell 1 when the battery is working normally guaranteed, but also when the temperature of the battery cell 2 is greater than or equal to the preset temperature, the meltable insulation melts, allowing the second conductive part 32 to quickly contact the inner wall of the shell 1, improving the timeliness of the external short circuit trigger.

[0148] In this article, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the application.

[0149] In this article, such as "first" and "second" and the like relationship terms are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0150] The above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement and the like made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery, characterized by, The battery cell (2) is arranged in the shell (1); The battery cell (2) comprises a first tab and a second tab; A first pole (3) is arranged on the shell (1) and insulated from the shell (1); The first tab is connected to the first pole (3), and the second tab is connected to the shell (1); A trigger structure (5) is arranged between the first pole (3) and the shell (1) to electrically connect the first pole (3) to the shell (1) when the temperature of the battery cell (2) is greater than or equal to a preset temperature.

2. The battery of claim 1, wherein, The trigger structure (5) comprises an insulating support (52) and a negative temperature coefficient thermistor (51); The insulating support (52) is supported between the first pole (3) and the shell (1); One end of the negative temperature coefficient thermistor (51) is connected to the first pole (3), and the other end of the negative temperature coefficient thermistor (51) is connected to the shell (1) to electrically connect the first pole (3) to the shell (1) through the negative temperature coefficient thermistor (51) when the temperature of the battery cell (2) is greater than or equal to the preset temperature.

3. The battery of claim 2, wherein, At least part of the negative temperature coefficient thermistor (51) is embedded in the insulating support (52); And / or, at least two negative temperature coefficient thermistors (51) are arranged between the first pole (3) and the shell (1), and the at least two negative temperature coefficient thermistors (51) are arranged in parallel between them; And / or, one end of the negative temperature coefficient thermistor (51) is welded to the first pole (3), and the other end of the negative temperature coefficient thermistor (51) is welded to the shell (1).

4. The battery of claim 2, wherein, The first pole (3) comprises a first conductive part (31), a conductive connecting part (33), and a second conductive part (32) connected in sequence; the shell (1) is provided with a through hole (10), the first conductive part (31) is located outside the shell (1), the conductive connecting part (33) is arranged in the through hole (10), and the second conductive part (32) is located inside the shell (1); The negative temperature coefficient thermistor (51) is connected between the outer wall of the shell (1) and the first conductive part (31); Or, the negative temperature coefficient thermistor (51) is connected between the conductive connecting part (33) and the hole wall of the through hole (10); Or, the negative temperature coefficient thermistor (51) is connected between the inner wall of the shell (1) and the second conductive part (32); Or, a second pole (4) is arranged on the shell (1), the second tab is connected to the shell (1) through the second pole (4), and the negative temperature coefficient thermistor (51) is connected between the second conductive part (32) and the second pole (4).

5. The battery of claim 1, wherein, The trigger structure (5) comprises a fusible insulator arranged between the first pole (3) and the shell (1); The fusible insulator melts when the temperature of the battery cell (2) is greater than or equal to the preset temperature, so as to make the first pole (3) and the shell (1) contact and conduct.

6. The battery of claim 5, wherein the electrolyte is a mixture of LiPF6 and LiBF4. The first pole (3) comprises a first conductive part (31) located outside the shell (1) and a second conductive part (32) located inside the shell (1), and the first conductive part (31) and the second conductive part (32) are electrically connected. At least part of the fusible insulator is arranged between the first conductive part (31) and the outer wall of the shell (1), and / or at least part of the fusible insulator is arranged between the second conductive part (32) and the inner wall of the shell (1).

7. The battery of claim 6, wherein, The first conductive part (31) and the second conductive part (32) are electrically connected by an elastic conductive part (6), and the shell (1) is provided with a through hole (10), the elastic conductive part (6) is arranged in the through hole (10), and the shell (1) is insulated; And / or, the thickness of the fusible insulator between the first conductive part (31) and the outer wall of the shell (1) in the first direction ranges from 0.2mm to 0.6mm; And / or, the thickness of the fusible insulator between the second conductive part (32) and the inner wall of the shell (1) in the first direction ranges from 0.2mm to 0.6mm.

8. The battery of claim 5, wherein, The first pole (3) is provided with at least one first conductive protrusion (30) extending towards the direction close to the shell (1) on the side facing the shell (1); And / or, the shell (1) is provided with at least one second conductive protrusion (11) extending towards the direction close to the first pole (3).

9. The battery of claim 8, wherein, At least one of the first conductive protrusions (30) and at least one of the second conductive protrusions (11) are correspondingly arranged, and the projections of the corresponding first conductive protrusions (30) and second conductive protrusions (11) in the second direction have overlapping parts; And / or, in the direction close to the shell (1), the width of the first conductive protrusion (30) gradually decreases; And / or, in the direction close to the first pole (3), the width of the second conductive protrusion (11) gradually decreases.

10. The battery of claim 5, wherein, The material of the fusible insulator is selected from one of polypropylene, polyimide and polymethyl methacrylate.

11. The battery according to any one of claims 1 to 10, characterized in that, The preset temperature is not less than 100℃; And / or, the shell (1) is a steel shell.

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