Battery and electric device

Abstract

The utility model provides a battery and a power utilization device, and belongs to the technical field of batteries. The battery comprises a box body, a separator and a battery monomer, an assembling space is formed in the box body. The isolation piece is configured to divide the assembly space into a first space and a second space, a through hole communicating the first space with the second space is formed in the isolation piece, and the through hole penetrates through the isolation piece in the first direction. The battery monomer comprises a shell, an electrode assembly and a terminal assembly, the shell is accommodated in the second space, the shell is provided with a wall part, the wall part is provided with a mounting hole, the electrode assembly is arranged in the shell, the terminal assembly is mounted on the wall part and covers the mounting hole, the terminal assembly is electrically connected with the electrode assembly, and the separator is arranged on the outer side of the wall part in the first direction; and the terminal assembly is inserted into the through hole. Therefore, the gas leaked from the terminal assembly in the battery monomer can enter the first space and is separated from the second space of the shell for accommodating the battery monomer, and the risks of fire and explosion of the battery and the like can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular, to a battery and an electrical device using the same. Background Art

[0002] In recent years, new energy vehicles have achieved leapfrog development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing day by day. Among them, as the core component of new energy vehicles, the battery has high requirements for both use stability and reliability.

[0003] In battery technology, a battery generally includes a box body and battery cells accommodated in the box body. To ensure the safety of the battery cells, a pressure relief structure for discharging the internal pressure of the battery cells is generally provided on the outer shell of the battery cells, so that when the internal pressure or temperature of the battery cells reaches a threshold value, the pressure relief structure can be actuated to discharge the internal pressure of the battery cells. However, the existing pressure relief structures of battery cells are prone to risks such as fire or explosion of the battery during pressure relief, resulting in great potential safety hazards during the use of the battery, which is not conducive to improving the use reliability of the battery. Summary of the Utility Model

[0004] An embodiment of the present application provides a battery and an electrical device using the same, which can effectively improve the use reliability of the battery.

[0005] In a first aspect, an embodiment of the present application provides a battery, including a box body, a separator, and battery cells; an assembly space is formed inside the box body; the separator is disposed in the assembly space and connected to the box body, and the separator is configured to divide the assembly space into a first space and a second space. A through hole communicating the first space and the second space is provided on the separator, and the through hole penetrates the separator along a first direction; the battery cell includes a housing, an electrode assembly, and a terminal assembly. The housing is accommodated in the second space, the housing has a wall portion, an installation hole is provided on the wall portion, the electrode assembly is disposed inside the housing, the terminal assembly is installed on the wall portion and covers the installation hole, and the terminal assembly is electrically connected to the electrode assembly; wherein, along the first direction, the separator is disposed outside the wall portion, and the terminal assembly is inserted into the through hole.

[0006] In the above technical solution, by providing a separator within the battery casing, the separator divides the assembly space inside the casing into a first space and a second space, and the separator is provided with a through hole penetrating the separator in a first direction. By arranging the separator to be located outside the wall portion in the first direction and inserting the terminal assembly of the battery cell into the through hole in the first direction, the gas leaking from the terminal assembly of the battery cell during the use of the battery can enter the first space through the through hole, so that the gas leaking from the terminal assembly of the battery cell during the use of the battery cell can be contained in the first space, so as to separate the gas leaking inside the battery cell from the second space of the outer casing containing the battery cell, thereby alleviating the spread and diffusion of the combustible gas in the gas leaking inside the battery cell in the second space of the outer casing containing the battery cell, reducing the phenomenon of excessive concentration of the combustible gas in the second space, and further effectively reducing the risks such as the battery catching fire and exploding after the thermal runaway gas or spark contacts the high-concentration combustible gas when the battery cell has a thermal runaway, reducing the safety hazards during the use of the battery, and being beneficial to improving the use reliability of the battery.

[0007] In some embodiments, the terminal assembly includes an electrode terminal, a connecting member, and an insulating member; the electrode terminal is located outside the wall portion, and at least part of the projection of the electrode terminal in the first direction is located in the mounting hole, and the electrode terminal is electrically connected to the electrode assembly; the connecting member is connected to the wall portion, and the connecting member is configured to fasten the electrode terminal to the wall portion; the insulating member is disposed between the electrode terminal and the connecting member, and the insulating member is configured to insulate and isolate the electrode terminal and the connecting member.

[0008] In the above technical solution, the terminal assembly is provided with an electrode terminal, a connecting member, and an insulating member. The electrode terminal is electrically connected to the electrode assembly to realize the input or output of the electric energy of the battery cell, and the electrode terminal is fastened to the wall portion through the connecting member to realize the assembly of the electrode terminal on the wall portion. By providing an insulating member between the electrode terminal and the connecting member, the insulating member can insulate and isolate the connecting member and the electrode terminal, reducing the risk of short circuit of the electrode terminal. Thus, by arranging the terminal assembly to be inserted into the through hole in the first direction, the gas leaking from the contact interface between the electrode terminal and the insulating member or the contact interface between the insulating member and the connecting member inside the battery cell can be contained in the first space.

[0009] In some embodiments, the terminal assembly and the housing together form a receiving space for receiving the electrode assembly. The terminal assembly has an exposed surface exposed outside the battery cell and an inner side surface facing the receiving space. A first contact interface is formed between the insulating member and the electrode terminal. The first contact interface has a first starting end and a first ending end. A second contact interface is formed between the insulating member and the connecting member. The second contact interface has a second starting end and a second ending end. The first starting end and the second starting end are both located on the inner side surface, and the first ending end and the second ending end are both located on the exposed surface. Wherein, the first ending end is located in the through hole or the first space; and / or, the projection of the second ending end in the first direction is located in the through hole.

[0010] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery cell is likely to leak from the first contact interface. By setting the first ending end of the first contact interface located on the exposed surface of the terminal assembly to be located in the through hole or the first space, it is convenient for the gas leaking from the first contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking from the inside of the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking from the inside of the battery cell spreads and diffuses in the second space of the box body. Similarly, a second contact interface is formed between the insulating member and the connecting member, and the gas inside the battery cell is likely to leak from the second contact interface. By setting the projection of the second ending end of the second contact interface located on the exposed surface of the terminal assembly in the first direction to be located in the through hole, it is convenient for the gas leaking from the second contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking from the inside of the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking from the inside of the battery cell spreads and diffuses in the second space of the box body.

[0011] In some embodiments, the terminal assembly and the housing together form a receiving space for receiving the electrode assembly. A first contact interface is formed between the insulating member and the electrode terminal, and a second contact interface is formed between the insulating member and the connecting member. The first space is configured to collect the gas leaking from the receiving space through the first contact interface and the second contact interface. The first contact interface has a first ending end away from the receiving space in the gas leakage direction, and the second contact interface has a second ending end away from the receiving space in the gas leakage direction. Wherein, the first ending end is located in the through hole or the first space; and / or, the projection of the second ending end in the first direction is located in the through hole.

[0012] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery cell is easy to leak from the first contact interface. By setting the first terminal end of the first contact interface away from the accommodation space in the gas leakage direction to be located in the through hole or in the first space, the gas leaked from the first contact interface can enter the first space, which is conducive to further improving the effect of the first space collecting the gas leaked from the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the battery cell spreads and diffuses in the second space of the box. Similarly, a second contact interface is formed between the insulating member and the connecting member, and the gas inside the battery cell is easy to leak from the second contact interface. By setting the second terminal end of the second contact interface away from the accommodation space in the gas leakage direction to be located in the through hole in the first direction, the gas leaked from the second contact interface can enter the first space, which is conducive to further improving the effect of the first space collecting the gas leaked from the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the battery cell spreads and diffuses in the second space of the box.

[0013] In some embodiments, the terminal assembly includes an electrode terminal and an insulating member; a portion of the electrode terminal is inserted into the mounting hole, and the electrode terminal is electrically connected to the electrode assembly; the insulating member is located on the side of the wall portion away from the electrode assembly along the first direction, and the insulating member is disposed between the electrode terminal and the wall portion, and the insulating member is configured to insulate and isolate the electrode terminal and the wall portion.

[0014] In the above technical solution, the terminal assembly is provided with an electrode terminal and an insulating member, and the electrode terminal is electrically connected to the electrode assembly to realize the input or output of electric energy of the battery cell. By arranging an insulating member between the electrode terminal and the wall portion, the insulating member can insulate and isolate the wall portion and the electrode terminal to reduce the risk of short circuit of the electrode terminal. Therefore, by arranging the terminal assembly as a structure inserted into the through hole along the first direction, the gas leaked from the inside of the battery cell from the contact interface between the electrode terminal and the insulating member or the contact interface between the insulating member and the wall portion can be contained in the first space.

[0015] In some embodiments, the terminal assembly and the housing together form a receiving space for receiving the electrode assembly, and the terminal assembly has an exposed surface exposed outside the battery cell; a first contact interface is formed between the insulating member and the electrode terminal, the first contact interface has a first starting end and a first ending end, a second contact interface is formed between the insulating member and the wall portion, the second contact interface has a second starting end and a second ending end, both the first ending end and the second ending end are located on the exposed surface, the first starting end is closer to the receiving space than the first ending end, and the second starting end is closer to the receiving space than the second ending end; wherein, the first ending end is located in the through hole or the first space; and / or, the projection of the second ending end in the first direction is located in the through hole.

[0016] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery cell is likely to leak from the first contact interface. By arranging the first ending end of the first contact interface located on the exposed surface of the terminal assembly to be located in the through hole or the first space, it is convenient for the gas leaking from the first contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking from the inside of the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking from the inside of the battery cell spreads and diffuses in the second space of the box body. Similarly, a second contact interface is formed between the insulating member and the wall portion, and the gas inside the battery cell is likely to leak from the second contact interface. By arranging the projection of the second ending end of the second contact interface located on the exposed surface of the terminal assembly in the first direction to be located in the through hole, it is convenient for the gas leaking from the second contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking from the inside of the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking from the inside of the battery cell spreads and diffuses in the second space of the box body.

[0017] In some embodiments, the terminal assembly and the housing together form a receiving space for receiving the electrode assembly, a first contact interface is formed between the insulating member and the electrode terminal, and a second contact interface is formed between the insulating member and the wall portion; the first space is configured to collect the gas leaking from the receiving space through the first contact interface and the second contact interface, the first contact interface has a first ending end away from the receiving space in the gas leakage direction, and the second contact interface has a second ending end away from the receiving space in the gas leakage direction; wherein, the first ending end is located in the through hole or the first space; and / or, the projection of the second ending end in the first direction is located in the through hole.

[0018] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery cell is likely to leak from the first contact interface. By setting the first contact interface away from the first end of the accommodation space in the gas leakage direction to be located in the through hole or the first space, it is convenient for the gas leaking from the first contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking inside the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking inside the battery cell spreads and diffuses in the second space of the box body. Similarly, a second contact interface is formed between the insulating member and the wall portion, and the gas inside the battery cell is likely to leak from the second contact interface. By setting the second contact interface away from the second end of the accommodation space in the gas leakage direction to have a projection in the first direction located in the through hole, it is convenient for the gas leaking from the second contact interface to enter the first space, thereby being beneficial to further improving the effect of the first space collecting the gas leaking inside the battery cell through the terminal assembly, so as to further alleviate the phenomenon that the combustible gas in the gas leaking inside the battery cell spreads and diffuses in the second space of the box body.

[0019] In some embodiments, the terminal assembly and the outer shell jointly form an accommodation space for accommodating the electrode assembly. The terminal assembly includes an electrode terminal, at least part of the projection of the electrode terminal in the first direction is located in the mounting hole, and the electrode terminal is electrically connected to the electrode assembly; wherein, the battery cell further includes a first seal, the first seal is located in the accommodation space, and the first seal is disposed between the electrode terminal and the wall portion, and the first seal is configured to seal the gap between the electrode terminal and the wall portion.

[0020] In the above technical solution, the battery cell is further provided with a first seal. By setting the first seal to be located in the accommodation space jointly formed by the terminal assembly and the outer shell, and setting the first seal between the electrode terminal of the terminal assembly and the wall portion of the outer shell, the first seal can also seal the gap between the electrode terminal and the wall portion, so that the first seal can play a certain role in blocking the gas inside the outer shell, thereby being able to alleviate the phenomenon that the gas inside the outer shell overflows through the mounting hole, and further reducing the risk of the gas in the accommodation space leaking through the terminal assembly.

[0021] In some embodiments, along the first direction, the projection of the terminal assembly is located in the through hole.

[0022] In the above technical solution, by setting the projection of the terminal assembly in the first direction to be located within the through hole, on the one hand, it is convenient for the terminal assembly to be inserted into the through hole in the first direction, and on the other hand, the gas leaking from the inside of the battery cell through the terminal assembly is more likely to enter the first space through the through hole, thereby facilitating further reduction of the difficulty for the first space to collect the gas leaking from the inside of the battery cell through the terminal assembly, and facilitating further improvement of the effect of the first space collecting the gas leaking from the inside of the battery cell through the terminal assembly, so as to further alleviate the risk of the flammable gas in the gas leaking from the inside of the battery cell spreading and diffusing in the second space of the box body.

[0023] In some embodiments, along the first direction, the wall portion abuts against the separator.

[0024] In the above technical solution, by setting the wall portion and the separator to be structures that abut against each other in the first direction, the tightness of the mutual assembly of the wall portion and the separator of the outer shell in the first direction can be improved, which is conducive to reducing the size of the gap between the wall portion and the separator of the outer shell, and further can effectively alleviate the phenomenon that the gas leaking from the inside of the battery cell through the terminal assembly spreads into the second space from the gap between the wall portion and the separator of the outer shell, so that when the battery cell undergoes thermal runaway, the risk of the thermal runaway gas or spark contacting the high-concentration flammable gas and causing the battery to catch fire and explode can be effectively reduced, so as to improve the reliability of the battery in use.

[0025] In some embodiments, along the first direction, a second sealing member is disposed between the wall portion and the separator, the wall portion abuts against the separator through the second sealing member, the second sealing member surrounds the terminal assembly, and the second sealing member is configured to seal the gap between the wall portion and the separator.

[0026] In the above technical solution, by disposing a second sealing member between the wall portion and the separator of the outer shell, the wall portion of the outer shell is a structure that abuts against the separator through the second sealing member in the first direction, and the second sealing member is a structure that surrounds the outer peripheral side of the terminal assembly. Thus, the second sealing member can seal the gap between the wall portion and the separator of the outer shell, so as to further improve the tightness of the mutual assembly of the wall portion and the separator of the outer shell in the first direction, which is conducive to further reducing the phenomenon that the gas leaking from the inside of the battery cell through the terminal assembly spreads into the second space from the gap between the wall portion and the separator of the outer shell, so that when the battery cell undergoes thermal runaway, the risk of the thermal runaway gas or spark contacting the high-concentration flammable gas and causing the battery to catch fire and explode can be further reduced, so as to further improve the reliability of the battery in use.

[0027] In some embodiments, the box body includes a first box body and a second box body arranged along the first direction, the first box body and the second box body cover each other and jointly define the assembly space; wherein, the isolation member is connected to the inner surface of the first box body facing the battery cell along the first direction, and the isolation member and the first box body jointly define the first space.

[0028] In the above technical solution, the box body is provided with a first box body and a second box body arranged along the first direction, and the first box body and the second box body cover each other and jointly define the assembly space. By arranging the isolation member on the inner surface of the first box body facing the battery cell along the first direction, the isolation member and the first box body can jointly define the first space. The battery with this structure can reduce the assembly difficulty of the isolation member and the difficulty of subsequent maintenance and replacement of the isolation member of the battery, thereby reducing the manufacturing cost and later maintenance cost of the battery.

[0029] In some embodiments, the second box body has a bottom plate, and the bottom plate and the isolation member are arranged at intervals along the first direction; wherein, along the first direction, the outer shell is arranged between the isolation member and the bottom plate, and the bottom plate is configured to support the battery cell.

[0030] In the above technical solution, the bottom plate of the second box body and the isolation member are structures arranged at intervals along the first direction. By arranging the outer shell of the battery cell between the isolation member and the bottom plate in the first direction, and the bottom plate can support the battery cell in the first direction, the isolation member is a structure located above the battery cell in the first direction, so that the first space jointly defined by the isolation member and the first box body is located above the battery cell in the first direction, facilitating the gas leaking from the terminal assembly of the battery cell to directly enter the first space through the through hole, which is beneficial to further reducing the difficulty of collecting the gas leaked from the battery cell inside through the terminal assembly in the first space and further improving the effect of collecting the gas leaked from the battery cell inside through the terminal assembly in the first space.

[0031] In some embodiments, a first exhaust hole is provided on the box body, and the first exhaust hole is communicated with the first space.

[0032] In the above technical solution, by providing a first exhaust hole on the box body that communicates with the first space, the first space can communicate with the outside of the box body through the first exhaust hole, thereby facilitating the discharge of the gas collected in the first space from the box body, so as to enable the combustible gas in the gas leaked inside the battery cell to be discharged from the box body in time, and further effectively alleviate the phenomenon that the combustible gas in the gas leaked inside the battery cell accumulates in the first space of the box body. On the one hand, when the battery cell has a thermal runaway, it can further reduce the risks such as the battery catching fire and exploding after the thermal runaway gas or sparks come into contact with the high-concentration combustible gas. On the other hand, it can alleviate the phenomenon that the gas in the first space accumulates too much and the gas leaked inside the battery cell through the terminal assembly cannot be further collected.

[0033] In some embodiments, the battery further includes a first valve; the first valve is disposed at the first exhaust hole, and the first valve is configured to allow the gas in the first space to discharge from the box body and prevent liquid from entering the first space.

[0034] In the above technical solution, by providing a first valve at the first exhaust hole of the box body, and the first valve is configured to allow the gas in the first space to discharge from the box body and prevent liquid from entering the first space, so that while the gas in the first space is discharged from the first space through the first valve, it can also alleviate the phenomenon of liquid entering the first space of the box body, which is beneficial to reducing the risks such as internal short circuit or damage of the battery caused by the liquid entering the box body, and further improving the use reliability and service life of the battery.

[0035] In some embodiments, the battery cell further includes a pressure relief component; the pressure relief component is disposed on the outer shell, and the pressure relief component is configured to relieve the internal pressure of the battery cell; wherein, the pressure relief component is located in the second space.

[0036] In the above technical solution, a pressure relief component is provided on the outer shell of the battery cell, so that when the battery cell has a thermal runaway, the internal pressure of the battery cell can be relieved through the pressure relief component to reduce the risks such as the battery cell exploding. Among them, by setting the pressure relief component of the battery cell to a structure located in the second space, the thermal runaway gas discharged by the battery cell through the pressure relief component can enter the second space, so that the combustible gas in the gas leaked inside the battery cell through the terminal assembly collected in the first space can be separated from the thermal runaway gas discharged by the pressure relief component of the battery cell. Thus, when the battery cell has a thermal runaway, it can effectively reduce the risks such as the battery catching fire and exploding after the thermal runaway gas comes into contact with the combustible gas, so as to reduce the potential safety hazards during the use of the battery, and further improve the use reliability of the battery.

[0037] In some embodiments, the separator is disposed facing the wall portion in the first direction, and the pressure relief component is disposed on the wall portion.

[0038] In the above technical solution, by disposing both the pressure relief component of the battery cell and the terminal assembly of the battery cell on the wall portion of the housing, the pressure relief component and the terminal assembly are disposed on the same side of the housing in the first direction, so that the pressure relief component and the terminal assembly can share part of the space in the first direction, which is beneficial to optimizing the spatial structure of the battery cell to save the space occupied by the battery cell in the first direction, and can reduce the difficulty of assembling the battery cell into the box body.

[0039] In some embodiments, along the first direction, an avoidance space is formed in the area of the separator corresponding to the pressure relief component. The avoidance space communicates with the second space and does not communicate with the first space.

[0040] In the above technical solution, by providing an avoidance space that communicates with the second space and does not communicate with the first space at the position of the separator corresponding to the pressure relief component along the first direction, when the pressure relief component releases the internal pressure of the battery cell, the shielding and blocking of the pressure relief component by the separator can be reduced, which is beneficial to improving the smoothness of the pressure relief component in releasing the internal pressure of the battery cell, and is also convenient for the thermal runaway gas released by the pressure relief component to enter the second space through the avoidance space, which is beneficial to alleviating the phenomenon that the thermal runaway gas released by the pressure relief component enters the first space.

[0041] In some embodiments, along the first direction, the projection of the pressure relief component is located in the avoidance space.

[0042] In the above technical solution, by setting the projection of the pressure relief component in the first direction to be located in the avoidance space, the whole of the pressure relief component can be disposed corresponding to the avoidance space in the first direction, so that when the pressure relief component releases the internal pressure of the battery cell, the shielding and blocking of the pressure relief component by the separator can be further reduced, which is beneficial to further improving the smoothness of the pressure relief component in releasing the internal pressure of the battery cell.

[0043] In some embodiments, the separator is disposed facing the wall portion in the first direction. Along the first direction, the pressure relief component is disposed at one end of the housing away from the wall portion.

[0044] In the above technical solution, by arranging the pressure relief component at one end of the outer shell away from the wall portion in the first direction, the pressure relief component of the battery cell and the terminal assembly of the battery cell are respectively located at both ends of the outer shell in the first direction. On the one hand, the interference effect between the terminal assembly and the pressure relief component can be reduced. On the other hand, the risk of the combustible gas in the hot runaway gas discharged by the pressure relief component coming into contact with the combustible gas in the gas leaking from the terminal assembly inside the battery cell can be further reduced.

[0045] In some embodiments, a second exhaust hole is provided on the box body, and the second exhaust hole communicates with the second space.

[0046] In the above technical solution, by providing a second exhaust hole communicating with the second space on the box body, the second space can communicate with the outside of the box body through the second exhaust hole, so as to facilitate the discharge of the hot runaway gas discharged by the pressure relief component of the battery cell from the box body, so as to realize that the hot runaway gas discharged by the pressure relief component of the battery cell can be discharged from the box body in time, and further can effectively relieve the phenomenon that the hot runaway gas discharged by the pressure relief component of the battery cell accumulates in the second space of the box body, which is beneficial to further reducing the risk of the battery catching fire and exploding after the combustible gas in the hot runaway gas discharged by the pressure relief component of the battery cell comes into contact with the combustible gas in the gas leaking from the terminal assembly inside the battery cell.

[0047] In some embodiments, the battery further includes a second valve; the second valve is arranged at the second exhaust hole, and the second valve is configured to discharge the internal pressure of the second space.

[0048] In the above technical solution, the battery is further provided with a second valve, and the second valve is arranged at the second exhaust hole of the box body, so that the second valve can discharge the internal pressure of the second space of the box body when the air pressure or temperature in the second space reaches a threshold value, so as to reduce the risk of the battery exploding or bursting during use.

[0049] In a second aspect, an electrical device provided in an embodiment of the present application further includes the above battery, and the battery is used to provide electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0051] Figure 1 A schematic structural diagram of a vehicle provided for some embodiments of the present application;

[0052] Figure 2 Schematic diagram of the structure of the battery provided by some embodiments of the present application;

[0053] Figure 3 Exploded view of the structure of the battery provided by some embodiments of the present application;

[0054] Figure 4 Cross-sectional view of the battery provided by some embodiments of the present application;

[0055] Figure 5 For Figure 4 Partial enlarged view of the A position of the battery shown;

[0056] Figure 6 Schematic diagram of the structure of the separator of the battery provided by some embodiments of the present application;

[0057] Figure 7 Assembly schematic diagram of the separator and the first box body provided by some embodiments of the present application;

[0058] Figure 8 Schematic diagram of the structure of the battery cell provided by some embodiments of the present application;

[0059] Figure 9 Cross-sectional view of the battery cell provided by some embodiments of the present application;

[0060] Figure 10 For Figure 9 Partial enlarged view of the B position of the battery cell shown;

[0061] Figure 11 Partial cross-sectional view of the battery cell provided by some other embodiments of the present application.

[0062] Icon: 1000 - vehicle; 100 - battery; 10 - box body; 11 - assembly space; 111 - first space; 112 - second space; 12 - first box body; 13 - second box body; 131 - bottom plate; 14 - first exhaust hole; 15 - second exhaust hole; 20 - separator; 21 - through hole; 22 - avoidance space; 30 - battery cell; 31 - outer shell; 311 - wall portion; 3111 - mounting hole; 312 - housing; 3121 - opening; 313 - end cover; 32 - electrode assembly; 33 - terminal assembly; 331 - electrode terminal; 3311 - first clamping portion; 3312 - second clamping portion; 332 - connecting member; 333 - insulating member; 334 - first contact interface; 3341 - first starting end; 3342 - first terminating end; 335 - second contact interface; 3351 - second starting end; 3352 - second terminating end; 34 - current collecting member; 35 - pressure relief component; 36 - first seal; 40 - second seal; 50 - first valve; 60 - second valve; 200 - controller; 300 - motor; X - first direction. Detailed implementation manners

[0063] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0064] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used in the description of the present application in the specification are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the description and claims of the present application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the description and claims of the present application or the above drawings are used to distinguish different objects and are not used to describe a specific order or primary-secondary relationship.

[0065] The mention of "embodiment" in the present application means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0066] In the description of the present application, it should be noted that, unless otherwise clearly defined and limited, the terms "installed", "connected", "coupled", and "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0067] The term "and / or" in the present application is only a relationship description of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0068] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only illustrative and should not constitute any limitation to the present application.

[0069] The term "a plurality of" as used in the present application means two or more (including two).

[0070] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can activate the active material through charging after discharging and can be used continuously.

[0071] The battery cell may be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application are not limited thereto.

[0072] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the short circuit between the positive and negative electrodes and allow the active ions to pass through at the same time.

[0073] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0074] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is disposed on any one or both of the two opposite surfaces of the positive electrode current collector.

[0075] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material substrate layer and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as the positive electrode active material of the battery can also be used. These positive electrode active materials can be used alone or in combination of two or more. Among them, examples of the lithium-containing phosphate may include but are not limited to lithium iron phosphate (such as LiFePO4 (which can also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite material of lithium manganese iron phosphate and carbon, etc. Examples of the lithium transition metal oxide may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be abbreviated as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be abbreviated as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be abbreviated as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be abbreviated as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be abbreviated as NCM 811 )、lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0077] In some embodiments, the positive electrode may be made of porous metal. The porous metal may be porous nickel, porous copper, porous aluminum, porous alloy, etc. When the porous metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the porous metal, and of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the porous metal, and the lithium source material is lithium metal and / or lithium-rich material.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] As an example, the negative electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, etc. The composite current collector can include a polymer material substrate layer and a metal layer. The composite current collector can be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0081] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0082] As an example, the negative electrode active material can be a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. The silicon-based materials can be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based materials can be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0083] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0084] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0085] In some embodiments, the separator is a separator membrane. The types of the separator membrane can be various, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0086] As an example, the material of the separator membrane may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator membrane can be a single-layer film or a multi-layer composite film. When the separator membrane is a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a single component located between the positive and negative electrodes, or attached to the surfaces of the positive and negative electrodes.

[0087] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0088] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0089] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro(bis(oxalato))phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0090] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0091] Among them, the gel electrolyte includes a polymer as the skeleton network of the electrolyte, combined with an ionic liquid-lithium salt.

[0092] Among them, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0093] As an example, the polymer solid electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, single-ion polymer, poly(ionic liquid)-lithium salt, cellulose, etc.

[0094] As an example, the inorganic solid electrolyte may include one or more of oxide solid electrolytes (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphorus sulfur, argyrodite), amorphous sulfide), and halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0095] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0096] In some embodiments, the electrode assembly has a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0097] In some embodiments, the electrode assembly has a laminated structure.

[0098] As an example, multiple positive electrode sheets and multiple negative electrode sheets may be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0099] As an example, multiple positive electrode sheets may be provided, and the negative electrode sheet is folded to form multiple folded segments arranged in a stacked manner, and a positive electrode sheet is clamped between adjacent folded segments.

[0100] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple folded segments arranged in a stacked manner.

[0101] As an example, multiple separators may be provided and are respectively arranged between any adjacent positive electrode sheet or negative electrode sheet.

[0102] As an example, the separators may be continuously provided and are arranged between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0103] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, etc.

[0104] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0105] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum plastic film, etc.

[0106] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0107] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0108] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0109] In some embodiments, the battery may be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0110] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, part of the box body may become at least part of the floor of the vehicle, or part of the box body may become at least part of the cross beam and longitudinal beam of the vehicle.

[0111] In some embodiments, the battery may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0112] The battery has prominent advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient, and is an important part of the development of new energy today. The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, the safety of the battery also needs to be considered.

[0113] In battery technology, a battery generally includes a battery case and battery cells accommodated in the battery case. For general battery cells, in order to ensure the use safety of the battery cells, a pressure relief structure is usually provided on the outer shell of the battery cell to release the internal pressure of the battery cell through the pressure relief structure, thereby effectively improving the use safety of the battery cell. Among them, the battery cell includes an outer shell, an electrode assembly, an electrolyte, and electrode terminals installed on the outer shell. The electrode assembly and the electrolyte are both accommodated in the outer shell. The outer shell is provided with mounting holes communicating the inside and the outside of the outer shell. The electrode terminals are installed in the mounting holes so that the electrode terminals can be electrically connected to the electrode assembly accommodated in the outer shell to realize the input or output of electrical energy of the battery cell. However, during the use of the battery cell in the related art, due to chemical reactions between the electrode assembly and the electrolyte or decomposition of the electrolyte, etc., a large amount of flammable gas is likely to be generated inside the outer shell of the battery cell. For example, water molecules in the electrolyte will be decomposed into hydrogen, etc., especially in sodium batteries. And because the molecules of the flammable gas are small, the flammable gas generated inside the battery cell is likely to overflow from the insulation interface or the sealing interface between the electrode terminal and the outer shell, resulting in the spread and accumulation of the flammable gas in the battery case. Thus, there is likely to be a large amount of flammable gas in the battery case. And after the battery cell is thermally out of control, the flammable gas is extremely likely to cause risks such as fire or explosion of the battery when contacting the high-temperature gas of the thermally out-of-control battery cell or the spark generated by the battery cell, resulting in a large potential safety hazard during the use of the battery, which is not conducive to improving the use reliability of the battery.

[0114] Based on the above considerations, in order to solve the problem that the battery is prone to catch fire or explode during use, an embodiment of the present application provides a battery, which includes a battery case, a separator, and battery cells. An assembly space is formed inside the battery case. The separator is disposed in the assembly space and connected to the battery case. The separator is configured to divide the assembly space into a first space and a second space. The separator is provided with through holes communicating the first space and the second space, and the through holes penetrate the separator along a first direction. The battery cell includes an outer shell, an electrode assembly, and a terminal assembly. The outer shell is accommodated in the second space. The outer shell has a wall portion. The wall portion is provided with mounting holes. The electrode assembly is disposed inside the outer shell. The terminal assembly is installed on the wall portion and covers the mounting holes. The terminal assembly is electrically connected to the electrode assembly. Along the first direction, the separator is disposed outside the wall portion, and the terminal assembly is inserted into the through holes. The first space is configured to collect the gas leaked from the inside of the battery cell through the terminal assembly.

[0115] In a battery with such a structure, by providing a separator within the battery case, the separator divides the assembly space inside the case into a first space and a second space, and the separator is provided with a through hole penetrating the separator in a first direction. By arranging the separator to be located outside the wall portion in the first direction and inserting the terminal assembly of the battery cell into the through hole in the first direction, the gas leaking from the terminal assembly of the battery cell during the use of the battery can enter the first space through the through hole, so that the gas leaking from the terminal assembly of the battery cell during the use of the battery cell can be contained in the first space, so as to realize that the gas leaking inside the battery cell can be separated from the second space of the outer shell containing the battery cell, thereby being able to alleviate the spread and diffusion of the combustible gas in the gas leaking inside the battery cell in the second space of the outer shell containing the battery cell of the battery, so as to reduce the phenomenon that the concentration of the combustible gas in the second space is too high. Furthermore, when the battery cell has a thermal runaway, it can effectively reduce the risks such as the battery catching fire and exploding after the thermal runaway gas or sparks come into contact with the high-concentration combustible gas, so as to reduce the potential safety hazards during the use of the battery and is beneficial to improving the use reliability of the battery.

[0116] The battery disclosed in the embodiments of the present application can be but is not limited to being used in power-consuming devices such as vehicles, ships or aircraft. A power supply system of the power-consuming device can be formed by using the battery disclosed in the present application. In this way, it is beneficial to alleviate the problem that the battery is prone to catching fire or exploding during use, so as to improve the use reliability of the battery.

[0117] The embodiments of the present application provide a power-consuming device using a battery as a power source. The power-consuming device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecrafts, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0118] For the convenience of description in the following embodiments, a power-consuming device of an embodiment of the present application is taken as an example of a vehicle for description.

[0119] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application, Figure 2Schematic structural diagram of battery 100 provided in some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. Battery 100 is disposed inside vehicle 1000. Battery 100 can be disposed at the bottom of vehicle 1000, or at the head of vehicle 1000, or at the tail of vehicle 1000. Battery 100 can be used to supply power to vehicle 1000. For example, battery 100 can be used as the operating power source or the power consumption source of vehicle 1000. Vehicle 1000 can also include a controller 200 and a motor 300. Controller 200 is used to control battery 100 to supply power to motor 300. For example, it is used for the working power consumption requirements during the start, navigation, and driving of vehicle 1000.

[0120] In some embodiments of the present application, battery 100 can not only be used as the operating power source or the power consumption source of vehicle 1000, but also as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0121] According to some embodiments of the present application, refer to Figure 2 , and please further refer to Figure 3 , Figure 4 and Figure 5 , Figure 3 Exploded view of the structure of battery 100 provided in some embodiments of the present application, Figure 4 Cross-sectional view of battery 100 provided in some embodiments of the present application, Figure 5 is Figure 4 Partial enlarged view of part A of battery 100 shown in. The present application provides a battery 100. Battery 100 includes a box body 10, a separator 20, and battery cells 30. An assembly space 11 is formed inside box body 10. Separator 20 is disposed in assembly space 11 and connected to box body 10. Separator 20 is configured to divide assembly space 11 into a first space 111 and a second space 112. Battery cell 30 includes a housing 31, an electrode assembly 32, and a terminal assembly 33. Housing 31 is accommodated in second space 112. Housing 31 has a wall portion 311. Wall portion 311 is provided with a mounting hole 3111. Along the first direction X, separator 20 is disposed outside wall portion 311, and separator 20 faces wall portion 311. Electrode assembly 32 is disposed inside housing 31. Terminal assembly 33 is mounted on wall portion 311 and covers mounting hole 3111. Terminal assembly 33 is electrically connected to electrode assembly 32. First space 111 is configured to collect the gas leaked from the inside of battery cell 30 through terminal assembly 33.

[0122] Among them, the box body 10 is used to provide an assembly space 11 for the battery cells 30, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 12 and a second box body 13 arranged along the first direction X. The first box body 12 and the second box body 13 cover each other, and the first box body 12 and the second box body 13 jointly define an assembly space 11 for accommodating the battery cells 30. The second box body 13 may be a hollow structure with one end open, and the first box body 12 may be a plate-like structure. The first box body 12 covers the open side of the second box body 13 so that the first box body 12 and the second box body 13 jointly define the assembly space 11; the first box body 12 and the second box body 13 may also both be hollow structures with one side open, and the open side of the first box body 12 covers the open side of the second box body 13. Exemplarily, in Figure 2 and Figure 3 , both the first box body 12 and the second box body 13 are hollow structures with one side open, and the open side of the first box body 12 covers the open side of the second box body 13 along the first direction X.

[0123] Of course, the box body 10 formed by the first box body 12 and the second box body 13 can be of various shapes, such as a cylinder, a cuboid or a cube, etc. Exemplarily, in Figure 2 , the shape of the box body 10 is a cuboid.

[0124] The separator 20 is disposed in the assembly space 11 and connected to the box body 10. The separator 20 is configured to divide the assembly space 11 into a first space 111 and a second space 112. That is to say, the separator 20 is located inside the box body 10 and connected to the inner surface of the box body 10, so that the separator 20 divides the assembly space 11 inside the box body 10 into two independent spaces, namely the first space 111 and the second space 112.

[0125] Optionally, the structure by which the separator 20 is connected to the box body 10 can be various, such as welding connection, bolt screwing or bonding, etc.

[0126] It should be noted that in the embodiments where the box body 10 includes the first box body 12 and the second box body 13, the separator 20 can be connected to the inner surface of the first box body 12 facing the assembly space 11, or can be connected to the inner surface of the second box body 13 facing the assembly space 11. Exemplarily, in Figure 4 and Figure 5 , the separator 20 is connected to the inner surface of the first box body 12 facing the battery cells 30 in the first direction X.

[0127] In the battery 100, the battery cell 30 disposed in the box 10 may be one or more. When there are more than one battery cell 30 disposed in the box 10, the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by first connecting multiple battery cells 30 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then the whole is accommodated in the box 10.

[0128] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is used to connect the plurality of battery cells 30 to achieve electrical connection between the plurality of battery cells 30 .

[0129] Each battery cell 30 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 30 may be in a rectangular parallelepiped, a cylinder, a prism or other shapes. For example, Figure 3 In the figure, the battery cell 30 is a rectangular parallelepiped structure.

[0130] The outer shell 31 of the battery cell 30 is accommodated in the second space 112, that is, the outer shell 31 of the battery cell 30 is located in the second space 112. Figure 4 and Figure 5 , and please refer to Figure 6 and Figure 7 , Figure 6 A schematic diagram of the structure of the isolation member 20 of the battery 100 provided in some embodiments of the present application, Figure 7 Schematic diagram of assembly of the separator 20 and the first box body 12 provided in some embodiments of the present application. The separator 20 is provided with a through hole 21 penetrating the separator 20 along the first direction X, and the through hole 21 connects the first space 111 and the second space 112, so that the terminal assembly 33 of the battery cell 30 is inserted into the through hole 21, and the shell 31 of the battery cell 30 is located in the second space 112, that is, the shell 31 of the battery cell 30 is located on the side of the separator 20 away from the first space 111 in the first direction X, that is, the shell 31 of the battery cell 30 is located on the side of the separator 20 facing the second space 112 in the first direction X.

[0131] Reference Figure 5 , and please refer to Figure 8 , Figure 9 and Figure 10 , Figure 8Schematic diagram of the structure of the battery cell 30 provided by some embodiments of the present application, Figure 9 Cross-sectional view of the battery cell 30 provided by some embodiments of the present application, Figure 10 For Figure 9 Partial enlarged view of the B position of the battery cell 30 shown. The outer shell 31 has a wall portion 311, and the wall portion 311 faces the separator 20 in the first direction X. That is to say, the separator 20 and the outer shell 31 of the battery cell 30 are arranged along the first direction X, and the wall of the outer shell 31 facing the separator 20 in the first direction X is provided with a mounting hole 3111 and a wall portion 311 for mounting the terminal assembly 33.

[0132] Among them, the outer shell 31 can also be used to accommodate an electrolyte, such as an electrolyte solution. The outer shell 31 can be in various structural forms. The material of the outer shell 31 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0133] In some embodiments, referring to Figure 5 , Figure 8 and Figure 9 shown, the outer shell 31 may include a housing 312 and an end cap 313. An accommodation cavity is formed inside the housing 312, and the accommodation cavity has an opening 3121, that is, the housing 312 is a hollow structure with one end open. The end cap 313 covers the opening 3121 of the housing 312 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.

[0134] Optionally, the wall portion 311 provided with the mounting hole 3111 and on which the terminal assembly 33 is mounted may be the end cap 313 of the outer shell 31, or may be the bottom wall of the housing 312 of the outer shell 31. Exemplarily, in Figure 8 , the wall portion 311 is the end cap 313 of the outer shell 31. Of course, in other embodiments, the wall portion 311 may also be the bottom wall of the housing 312 disposed opposite to the end cap 313 in the first direction X.

[0135] When assembling the battery cell 30, the electrode assembly 32 can be first placed into the housing 312, and the electrolyte can be filled into the housing 312, and then the end cap 313 is covered on the opening 3121 of the housing 312 to close the opening 3121 of the housing 312.

[0136] It should be noted that the first direction X is the thickness direction of the wall portion 311, and the first direction X is also the arrangement direction of the wall portion 311 and the separator 20.

[0137] The wall portion 311 is provided with a mounting hole 3111. The terminal assembly 33 is mounted on the wall portion 311 and covers the mounting hole 3111. The terminal assembly 33 is electrically connected to the electrode assembly 32. That is to say, the terminal assembly 33 is a structure mounted and fixed on the wall portion 311, and the projection of the mounting hole 3111 in the first direction X is located within the terminal assembly 33, so that the terminal assembly 33 can cover and block the mounting hole 3111 of the wall portion 311 in the first direction X, and enables the terminal assembly 33 to be electrically connected to the electrode assembly 32 accommodated inside the housing 31 through the mounting hole 3111.

[0138] It should be noted that the terminal assembly 33 includes electrode terminals 331 for electrically connecting with the electrode assembly 32. At least part of the projection of the electrode terminals 331 in the first direction X is located within the mounting hole 3111, so that the electrode terminals 331 can be electrically connected to the electrode assembly 32. Optionally, the electrode terminals 331 can be a structure at least partially inserted into the mounting hole 3111, or a structure located on one side of the wall portion 311 in the first direction X. Similarly, the electrode assembly 32 and the electrode terminals 331 can be directly connected or indirectly connected. Exemplarily, referring to Figure 9 and Figure 10 As shown, the battery cell 30 may further include a current collector member 34. The current collector member 34 is disposed inside the housing 31, and the current collector member 34 connects the electrode terminals 331 and the tabs of the electrode assembly 32 to achieve electrical connection between the electrode assembly 32 and the electrode terminals 331.

[0139] It should be noted that the connection structures between the current collector member 34 and the electrode terminals 331 and between the current collector member 34 and the tabs of the electrode assembly 32 can be various. For example, welding connection or abutting connection, etc.

[0140] The first space 111 is configured to collect the gas leaked from the inside of the battery cell 30 through the terminal assembly 33, that is, the gas leaked from the inside of the battery cell 30 through the terminal assembly 33 can enter the first space 111, so that the gas leaked from the inside of the battery cell 30 through the terminal assembly 33 can be collected in the first space 111. It should be noted that the gas leaked from the inside of the battery cell 30 through the terminal assembly 33 can be a structure directly entering the first space 111. For example, in Figure 5In this case, the separator 20 is provided with a through hole 21 penetrating the separator 20 in the first direction X. The through hole 21 communicates the first space 111 and the second space 112, and the terminal assembly 33 of the battery cell 30 is inserted into the through hole 21 in the first direction X, so that the gas leaking from the inside of the battery cell 30 through the terminal assembly 33 can directly enter the first space 111. Of course, in other embodiments, the gas leaking from the inside of the battery cell 30 through the terminal assembly 33 can also enter the first space 111 indirectly. For example, a connecting pipe is directly connected between the terminal assembly 33 and the first space 111. One end of the connecting pipe communicates with the first space 111, and the terminal assembly 33 is inserted into the other end of the connecting pipe, so that the gas leaking from the inside of the battery cell 30 through the terminal assembly 33 can indirectly enter the first space 111 through the connecting pipe.

[0141] Among them, in Figure 4 this case, the separator 20 is located above the battery cell 30 in the first direction X. The separator 20 is provided with a through hole 21. The through hole 21 penetrates the separator 20 in the first direction X. The first through hole 21 communicates the first space 111 and the second space 112, and the terminal assembly 33 is inserted into the through hole 21, so that the gas leaking from the inside of the battery cell 30 through the terminal assembly 33 can enter the first space 111 through the through hole 21, so as to enable the first space 111 to collect the gas leaking from the inside of the battery cell 30 through the terminal assembly 33.

[0142] It should be noted that during the use of the battery cell 30 inside the battery 100, due to the chemical reaction between the electrode assembly 32 and the electrolyte inside the battery 100 or the decomposition of the electrolyte, etc., it is very easy to generate a large amount of flammable gas inside the outer shell 31 of the battery cell 30. For example, the electrolyte includes water, and water molecules will be decomposed into hydrogen, etc. Correspondingly, the first space 111 is used to collect the flammable gas leaking from the inside of the battery cell 30 from the terminal assembly 33.

[0143] In this embodiment, by providing a separator 20 inside the casing 10 of the battery 100, the separator 20 can divide the assembly space 11 inside the casing 10 into a first space 111 for collecting the gas leaked through the terminal assembly 33 inside the battery cell 30 and a second space 112 for accommodating the outer casing 31 of the battery cell 30. During the use of the battery cell 30, the gas leaked from the terminal assembly 33 of the battery cell 30 can be contained in the first space 111, so as to separate the gas leaked inside the battery cell 30 from the second space 112 accommodating the outer casing 31 of the battery cell 30. Thereby, it can alleviate the spread and diffusion of the flammable gas in the gas leaked inside the battery cell 30 in the second space 112 of the casing 10 accommodating the outer casing 31 of the battery cell 30, reduce the phenomenon that the concentration of the flammable gas in the second space 112 is too high, and further effectively reduce the risks such as fire and explosion of the battery 100 caused by the contact between the thermal runaway gas or spark and the high-concentration flammable gas when the battery cell 30 undergoes thermal runaway, reduce the potential safety hazards during the use of the battery 100, and is beneficial to improving the use reliability of the battery 100.

[0144] According to some embodiments of the present application, referring to Figure 4 , Figure 5 , Figure 6 , Figure 9 and Figure 10 As shown, the separator 20 is provided with a through hole 21 communicating the first space 111 and the second space 112, and the through hole 21 penetrates the separator 20 along the first direction X. The separator 20 and the wall portion 311 are arranged facing each other in the first direction X, and the terminal assembly 33 is inserted into the through hole 21 along the first direction X.

[0145] Among them, the through hole 21 penetrates the separator 20 along the first direction X, that is, the through hole 21 is a structure extending along the first direction X, and both ends of the through hole 21 in the first direction X extend to the surfaces on both sides of the separator 20 in the first direction X, so that the through hole 21 can communicate the first space 111 and the second space 112.

[0146] The separator 20 and the wall portion 311 are arranged facing each other in the first direction X, that is to say, the separator 20 and the wall portion 311 are structures arranged side by side and facing each other in the first direction X.

[0147] In this embodiment, the separator 20 is provided with a through hole 21 penetrating the separator 20 in the first direction X. By connecting the first space 111 and the second space 112, the wall portion 311 of the outer shell 31 of the battery cell 30 is arranged facing the separator 20 in the first direction X, and the terminal assembly 33 of the battery cell 30 is inserted into the through hole 21 in the first direction X. Thus, the gas leaking from the terminal assembly 33 of the battery cell 30 can directly enter the first space 111 through the through hole 21, which is beneficial to reducing the difficulty of collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33 in the first space 111, and is beneficial to improving the effect of collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33 in the first space 111.

[0148] According to some embodiments of the present application, referring to Figure 9 and Figure 10 as shown, the terminal assembly 33 may include an electrode terminal 331, a connecting member 332, and an insulating member 333. The electrode terminal 331 is located outside the wall portion 311, and at least a part of the projection of the electrode terminal 331 in the first direction X is located in the mounting hole 3111. The electrode terminal 331 is electrically connected to the electrode assembly 32. The connecting member 332 is connected to the wall portion 311, and the connecting member 332 is configured to fasten the electrode terminal 331 to the wall portion 311. The insulating member 333 is disposed between the electrode terminal 331 and the connecting member 332, and the insulating member 333 is configured to insulate and isolate the electrode terminal 331 and the connecting member 332.

[0149] Among them, the electrode terminal 331 covers the mounting hole 3111 in the first direction X, and the electrode terminal 331 is connected to the tab of the electrode assembly 32 through a current collecting member 34.

[0150] The connecting member 332 functions to assemble and fix the electrode terminal 331 to the wall portion 311. The connecting member 332 is an annular structure surrounding the outside of the electrode terminal 331. The connecting member 332 is connected to the wall portion 311, and the connecting member 332 is used to press the electrode terminal 331 against the wall portion 311 in the first direction X, so that the connecting member 332 and the wall portion 311 can cooperate to clamp the electrode terminal 331 to realize fastening and assembling the electrode terminal 331 to the wall portion 311.

[0151] Exemplarily, the connecting member 332 is welded to the wall portion 311.

[0152] The insulating member 333 is disposed between the electrode terminal 331 and the connecting member 332. The insulating member 333 is configured to insulate and isolate the electrode terminal 331 and the connecting member 332. That is to say, at least a part of the insulating member 333 is located between the electrode terminal 331 and the connecting member 332, so that the insulating member 333 can insulate and isolate the electrode terminal 331 and the connecting member 332, and the connecting member 332 is a structure that is indirectly pressed against the electrode terminal 331 through the insulating member 333.

[0153] Exemplarily, in Figure 10 , a part of the connecting member 332 is embedded in the insulating member 333, that is, the insulating member 333 covers the outside of a part of the connecting member 332, which is beneficial to improving the assembly stability between the connecting member 332 and the insulating member 333.

[0154] Optionally, the material of the insulating member 333 can be various. For example, the material of the insulating member 333 can be rubber, silica gel, plastic, etc.

[0155] In this embodiment, the terminal assembly 33 is provided with an electrode terminal 331, a connecting member 332 and an insulating member 333. The electrode terminal 331 is electrically connected to the electrode assembly 32 to realize the input or output of electric energy of the battery cell 30, and the electrode terminal 331 is fastened to the wall portion 311 through the connecting member 332 to realize the assembly of the electrode terminal 331 on the wall portion 311. By providing the insulating member 333 between the electrode terminal 331 and the connecting member 332, the insulating member 333 can insulate and isolate the connecting member 332 and the electrode terminal 331 to reduce the short-circuit risk of the electrode terminal 331. Thus, by setting the terminal assembly 33 to be inserted into the through hole 21 along the first direction X, the gas leaking out from the contact interface between the electrode terminal 331 and the insulating member 333 or the contact interface between the insulating member 333 and the connecting member 332 inside the battery cell 30 can be received in the first space 111.

[0156] According to some embodiments of the present application, in combination with Figure 5 、 Figure 9 and Figure 10As shown, the terminal assembly 33 and the housing 31 jointly form a receiving space for receiving the electrode assembly 32. The terminal assembly 33 has an exposed surface exposed outside the battery cell 30 and an inner surface facing the receiving space. A first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331. The first contact interface 334 has a first starting end 3341 and a first ending end 3342. A second contact interface 335 is formed between the insulating member 333 and the connecting member 332. The second contact interface 335 has a second starting end 3351 and a second ending end 3352. The first starting end 3341 and the second starting end 3351 are both located on the inner surface, and the first ending end 3342 and the second ending end 3352 are both located on the exposed surface. The first ending end 3342 is located in the through hole 21 or the first space 111; and / or, the projection of the second ending end 3352 in the first direction X is located in the through hole 21.

[0157] Wherein, the receiving space is the space jointly formed by the terminal assembly 33 and the housing 31. An installation hole 3111 is provided on the wall portion 311 of the housing 31, and the terminal assembly 33 covers the installation hole 3111. Correspondingly, the receiving space includes the internal space of the housing 31, the space where the installation hole 3111 is located, and the space between the terminal assembly 33 and the wall portion 311. For example, in an embodiment where the battery cell 30 further includes a first sealing member 36, the first sealing member 36 is disposed between the wall portion 311 and the electrode terminal 331, and a part of the first sealing member 36 extends into the installation hole 3111 to seal the gap between the electrode terminal 331 and the wall portion 311. Correspondingly, the first sealing member 36 is also located in the receiving space jointly formed by the terminal assembly 33 and the housing 31.

[0158] The exposed surface of the terminal assembly 33 is the outer surface of the terminal assembly 33 exposed on the outside. On the contrary, the inner surface of the terminal assembly 33 is the inner surface of the terminal assembly 33 facing the receiving space.

[0159] It should be noted that the first contact interface 334 is the surface where the insulating member 333 and the electrode terminal 331 are in contact with each other, and the second contact interface 335 is the surface where the insulating member 333 and the connecting member 332 are in contact with each other. Correspondingly, the first space 111 is configured to collect the gas leaked from the inside of the battery cell 30 through the first contact interface 334 and the second contact interface 335. That is to say, the gas inside the battery cell 30 mainly leaks out through the first contact interface 334 between the insulating member 333 and the electrode terminal 331 or the second contact interface 335 between the insulating member 333 and the connecting member 332 and is collected into the first space 111.

[0160] The first termination end 3342 of the first contact interface 334 is the end of the first contact interface 334 exposed on the outside. Conversely, the first starting end 3341 of the first contact interface 334 is the end of the first contact interface 334 located on the inner surface of the accommodation space. Similarly, the second termination end 3352 of the second contact interface 335 is the end of the second contact interface 335 exposed on the outside. Conversely, the second starting end 3351 of the second contact interface 335 is the end of the second contact interface 335 located on the inner surface of the accommodation space.

[0161] The first termination end 3342 is located in the through hole 21 or the first space 111. That is, the first termination end 3342 of the first contact interface 334 can be a structure located in the through hole 21 or a structure located in the first space 111.

[0162] The projection of the second termination end 3352 in the first direction X is located in the through hole 21. That is to say, in the same plane perpendicular to the first direction X, the orthographic projection of the second termination end 3352 is located inside the orthographic projection of the hole wall surface of the through hole 21.

[0163] In this embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and the gas inside the battery cell 30 is likely to leak from the first contact interface 334. By setting the first termination end 3342 of the first contact interface 334 located on the exposed surface of the terminal assembly 33 to be located in the through hole 21 or the first space 111, it is convenient for the gas leaking from the first contact interface 334 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the battery cell 30 spreads and diffuses in the second space 112 of the box body 10. Similarly, a second contact interface 335 is formed between the insulating member 333 and the connecting member 332, and the gas inside the battery cell 30 is likely to leak from the second contact interface 335. By setting the second termination end 3352 of the second contact interface 335 located on the exposed surface of the terminal assembly 33 to have a projection in the first direction X located in the through hole 21, it is convenient for the gas leaking from the second contact interface 335 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the battery cell 30 spreads and diffuses in the second space 112 of the box body 10.

[0164] According to some embodiments of the present application, please continue to combine Figure 5 、 Figure 9 and Figure 10As shown, the terminal assembly 33 and the housing 31 together form a receiving space for receiving the electrode assembly 32. A first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and a second contact interface 335 is formed between the insulating member 333 and the connecting member 332. The first space 111 is configured to collect the gas leaked from the receiving space through the first contact interface 334 and the second contact interface 335. The first contact interface 334 has a first terminal end 3342 away from the receiving space in the gas leakage direction, and the second contact interface 335 has a second terminal end 3352 away from the receiving space in the gas leakage direction. The first terminal end 3342 is located in the through hole 21 or the first space; and / or, the projection of the second terminal end 3352 in the first direction X is located in the through hole 21.

[0165] Among them, the first contact interface 334 has a first terminal end 3342 away from the receiving space in the gas leakage direction. That is to say, the first terminal end 3342 is the end where the first contact interface 334 contacts the outside of the battery cell 30.

[0166] The second contact interface 335 has a second terminal end 3352 away from the receiving space in the gas leakage direction. That is to say, the second terminal end 3352 is the end where the second contact interface 335 contacts the outside of the battery cell 30.

[0167] In this embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and the gas inside the battery cell 30 is likely to leak from the first contact interface 334. By setting the first terminal end 3342 of the first contact interface 334 away from the receiving space in the gas leakage direction to be located in the through hole 21 or the first space 111, it is convenient for the gas leaked from the first contact interface 334 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the inside of the battery cell 30 spreads and diffuses in the second space 112 of the box body 10. Similarly, a second contact interface 335 is formed between the insulating member 333 and the connecting member 332, and the gas inside the battery cell 30 is likely to leak from the second contact interface 335. By setting the projection of the second terminal end 3352 of the second contact interface 335 away from the receiving space in the gas leakage direction in the first direction X to be located in the through hole 21, it is convenient for the gas leaked from the second contact interface 335 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from the inside of the battery cell 30 spreads and diffuses in the second space 112 of the box body 10.

[0168] According to some embodiments of the present application, with reference to Figure 11 , Figure 11 FIG. is a partial cross-sectional view of the battery cell 30 provided in still other embodiments of the present application. The terminal assembly 33 may include an electrode terminal 331 and an insulator 333. A part of the electrode terminal 331 is inserted into the mounting hole 3111, and the electrode terminal 331 is electrically connected to the electrode assembly 32. The insulator 333 is located on the side of the wall portion 311 facing away from the electrode assembly 32 in the first direction X, and at least a part of the insulator 333 is disposed between the electrode terminal 331 and the wall portion 311. The insulator 333 is configured to insulate and isolate the electrode terminal 331 and the wall portion 311.

[0169] Wherein, a part of the electrode terminal 331 is inserted into the mounting hole 3111, that is, a part of the electrode terminal 331 is a structure inserted into the mounting hole 3111 of the wall portion 311, so that the electrode terminal 331 can be electrically connected to the electrode assembly 32 accommodated in the housing 31.

[0170] The electrode terminal 331 has a first clamping portion 3311 and a second clamping portion 3312. The first clamping portion 3311 is located on the side of the wall portion 311 facing away from the electrode assembly 32, and the second clamping portion 3312 is located on the side of the wall portion 311 facing the electrode assembly 32. The first clamping portion 3311 and the second clamping portion 3312 are configured to cooperate to clamp the wall portion 311. That is to say, a part of the electrode terminal 331 is located on the side of the wall portion 311 facing away from the electrode assembly 32 in the first direction X. Correspondingly, this part is the first clamping portion 3311 of the electrode terminal 331, and a part of the electrode terminal 331 is located on the side of the wall portion 311 facing the electrode assembly 32 in the first direction X. Correspondingly, this part is the second clamping portion 3312 of the electrode terminal 331, so that a part of the wall portion 311 can be located between the first clamping portion 3311 and the second clamping portion 3312 in the first direction X. By the cooperative clamping of the first clamping portion 3311 and the second clamping portion 3312 on the wall portion 311, the electrode terminal 331 can be fastened to the wall portion 311. Exemplarily, the electrode terminal 331 is riveted to the wall portion 311 so that the electrode terminal 331 is formed with the first clamping portion 3311 and the second clamping portion 3312 respectively located on both sides of the wall portion 311.

[0171] It should be noted that the first clamping portion 3311 and the second clamping portion 3312 may be structures that directly clamp the wall portion 311, that is, the first clamping portion 3311 and the second clamping portion 3312 are directly in contact with the wall portion 311. Of course, the first clamping portion 3311 and the second clamping portion 3312 may also be structures that indirectly clamp the wall portion 311, that is, the first clamping portion 3311 and the second clamping portion 3312 may be structures that are indirectly in contact with the wall portion 311 through other components.

[0172] Exemplarily, inFigure 11 Among them, at least a part of the insulating member 333 is disposed between the first clamping portion 3311 and the wall portion 311, and the insulating member 333 is configured to insulate and isolate the first clamping portion 3311 and the wall portion 311, so that the first clamping portion 3311 and the wall portion 311 are indirectly abutted through the insulating member 333, thereby realizing the insulating isolation between the wall portion 311 and the first clamping portion 3311 through the insulating member 333.

[0173] Optionally, the material of the insulating member 333 can be various. For example, the material of the insulating member 333 can be rubber, silica gel, plastic, etc.

[0174] In this embodiment, the terminal assembly 33 is provided with an electrode terminal 331 and an insulating member 333. The electrode terminal 331 is electrically connected to the electrode assembly 32 to realize the input or output of electrical energy of the battery cell 30. By providing the insulating member 333 between the electrode terminal 331 and the wall portion 311, the insulating member 333 can insulate and isolate the wall portion 311 and the electrode terminal 331 to reduce the short - circuit risk of the electrode terminal 331. Thus, by arranging the terminal assembly 33 to be inserted into the through - hole 21 along the first direction X, the gas leaking out from the contact interface between the electrode terminal 331 and the insulating member 333 or the contact interface between the insulating member 333 and the wall portion 311 inside the battery cell 30 can be received in the first space 111.

[0175] According to some embodiments of the present application, in combination with Figure 5 and Figure 11 As shown, the terminal assembly 33 and the housing 31 together form a receiving space for receiving the electrode assembly 32. The terminal assembly 33 has an exposed surface exposed outside the battery cell 30. A first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331. The first contact interface 334 has a first starting end 3341 and a first ending end 3342. A second contact interface 335 is formed between the insulating member 333 and the wall portion 311. The second contact interface 335 has a second starting end 3351 and a second ending end 3352. Both the first ending end 3342 and the second ending end 3352 are located on the exposed surface. The first starting end 3341 is closer to the receiving space than the first ending end 3342, and the second starting end 3351 is closer to the receiving space than the second ending end 3352. The first ending end 3342 is located in the through - hole 21 or the first space 111; and / or, the projection of the second ending end 3352 in the first direction X is located in the through - hole 21.

[0176] Among them, the accommodating space is the space jointly formed by the terminal assembly 33 and the outer shell 31, and a mounting hole 3111 is provided on the wall portion 311 of the outer shell 31, and the terminal assembly 33 covers the mounting hole 3111. Correspondingly, the accommodating space includes the internal space of the outer shell 31, the space where the mounting hole 3111 is located, and the space between the terminal assembly 33 and the wall portion 311. For example, in an embodiment in which the battery cell 30 also includes a first seal 36, the first seal 36 is arranged between the electrode terminal 331 and the hole wall surface of the mounting hole 3111 to seal the gap between the electrode terminal 331 and the hole wall surface of the mounting hole 3111, and a portion of the first seal 36 extends to the side of the wall portion 311 away from the electrode assembly 32 and is located between the first clamping portion 3311 and the wall portion 311. Correspondingly, the first seal 36 is also located in the accommodating space jointly formed by the terminal assembly 33 and the outer shell 31.

[0177] It should be noted that the first contact interface 334 is the surface where the insulating member 333 and the first clamping portion 3311 of the electrode terminal 331 contact each other, and the second contact interface 335 is the surface where the insulating member 333 and the wall portion 311 contact each other. The first space 111 is configured to collect gas leaked from the inside of the battery cell 30 through the first contact interface 334 and the second contact interface 335, that is, the gas inside the battery cell 30 mainly leaks out through the first contact interface 334 between the insulating member 333 and the first clamping portion 3311 of the electrode terminal 331 or the second contact interface 335 between the insulating member 333 and the wall portion 311 and is collected in the first space 111.

[0178] The exposed surface of the terminal assembly 33 is the outer surface of the terminal assembly 33 exposed to the outside, and correspondingly, the first termination end 3342 and the second termination end 3352 are both located on the exposed surface, that is, the first termination end 3342 of the first contact interface 334 is the end of the first contact interface 334 exposed to the outside, and the second termination end 3352 of the second contact interface 335 is the end of the second contact interface 335 exposed to the outside.

[0179] The first starting end 3341 is closer to the accommodation space than the first terminating end 3342, that is, when the gas inside the battery cell 30 leaks from the first contact interface 334, the leaked gas will first pass through the first starting end 3341 and then pass through the first terminating end 3342. Similarly, the second starting end is closer to the accommodation space than the second terminating end, that is, when the gas inside the battery cell 30 leaks from the second contact interface 335, the leaked gas will first pass through the second starting end 3351 and then pass through the second terminating end 3352.

[0180] In this embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and the gas inside the battery cell 30 is likely to leak from the first contact interface 334. By arranging the first termination end 3342 of the first contact interface 334 on the exposed surface of the terminal assembly 33 to be located inside the through hole 21 or inside the first space 111, it is convenient for the gas leaking from the first contact interface 334 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from inside the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from inside the battery cell 30 spreads and diffuses in the second space 112 of the box body 10. Similarly, a second contact interface 335 is formed between the insulating member 333 and the wall portion 311, and the gas inside the battery cell 30 is likely to leak from the second contact interface 335. By arranging the second termination end 3352 of the second contact interface 335 on the exposed surface of the terminal assembly 33 to have a projection in the first direction X located inside the through hole 21, it is convenient for the gas leaking from the second contact interface 335 to enter the first space 111, which is beneficial to further improving the effect of the first space 111 in collecting the gas leaked from inside the battery cell 30 through the terminal assembly 33, so as to further alleviate the phenomenon that the combustible gas in the gas leaked from inside the battery cell 30 spreads and diffuses in the second space 112 of the box body 10.

[0181] According to some embodiments of the present application, please continue to combine Figure 5 and Figure 11 As shown, the terminal assembly 33 and the outer shell 31 jointly form an accommodation space for accommodating the electrode assembly 32. A first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and a second contact interface 335 is formed between the insulating member 333 and the wall portion 311. The first space 111 is configured to collect the gas leaked from the accommodation space through the first contact interface 334 and the second contact interface 335. The first contact interface 334 has a first termination end 3342 away from the accommodation space in the gas leakage direction, and the second contact interface 335 has a second termination end 3352 away from the accommodation space in the gas leakage direction. The first termination end 3342 is located inside the through hole 21 or the first space 111; and / or, the projection of the second termination end 3352 in the first direction X is located inside the through hole 21.

[0182] Among them, the first contact interface 334 has a first termination end 3342 away from the accommodation space in the gas leakage direction, that is to say, the first termination end 3342 is the end of the first contact interface 334 in contact with the outside of the battery cell 30.

[0183] The second contact interface 335 has a second termination end 3352 away from the accommodation space in the gas leakage direction, that is to say, the second termination end 3352 is the end where the second contact interface 335 contacts the outside of the battery cell 30.

[0184] In this embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and the gas inside the battery cell 30 is likely to leak from the first contact interface 334. By setting the first termination end 3342 of the first contact interface 334 away from the accommodation space in the gas leakage direction to be located in the through hole 21 or the first space 111, it is convenient for the gas leaking from the first contact interface 334 to enter the first space 111, thereby facilitating further improving the effect of the first space 111 collecting the gas leaked inside the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon that the combustible gas in the gas leaked inside the battery cell 30 spreads and diffuses in the second space 112 of the box body 10. Similarly, a second contact interface 335 is formed between the insulating member 333 and the wall portion 311, and the gas inside the battery cell 30 is likely to leak from the second contact interface 335. By setting the second termination end 3352 of the second contact interface 335 away from the accommodation space in the gas leakage direction to have a projection in the first direction X located in the through hole 21, it is convenient for the gas leaking from the second contact interface 335 to enter the first space 111, thereby facilitating further improving the effect of the first space 111 collecting the gas leaked inside the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon that the combustible gas in the gas leaked inside the battery cell 30 spreads and diffuses in the second space 112 of the box body 10.

[0185] In some embodiments, referring to Figure 10 and Figure 11 as shown, the terminal assembly 33 and the housing 31 jointly form an accommodation space for accommodating the electrode assembly 32. The terminal assembly 33 includes an electrode terminal 331. At least part of the projection of the electrode terminal 331 in the first direction X is located in the mounting hole 3111, and the electrode terminal 331 is electrically connected to the electrode assembly 32. The battery cell 30 further includes a first seal 36. The first seal 36 is located in the accommodation space, and the first seal 36 is disposed between the electrode terminal 331 and the wall portion 311. The first seal 36 is configured to seal the gap between the electrode terminal 331 and the wall portion 311.

[0186] Wherein, the first seal 36 is disposed in the accommodation space jointly formed by the terminal assembly 33 and the housing 31, and the first seal 36 functions to seal the gap between the electrode terminal 331 and the wall portion 311. Exemplarily, the material of the first seal 36 can be various, such as rubber, silica gel or plastic, etc.

[0187] InFigure 10 Among them, a part of the first seal 36 is located between the electrode terminal 331 and the wall portion 311 in the first direction X, and the part of the first seal 36 extends into the mounting hole 3111. Correspondingly, the space where the first seal 36 is located is also the accommodation space jointly formed by the terminal assembly 33 and the housing 31.

[0188] In Figure 11 Among them, a part of the first seal 36 is located in the mounting hole 3111, a part of the first seal 36 is located between the wall portion 311 and the first clamping portion 3311 of the electrode terminal 331, and a part of the first seal 36 is located between the wall portion 311 and the second clamping portion 3312 of the electrode terminal 331. Correspondingly, the space where the first seal 36 is located is also the accommodation space jointly formed by the terminal assembly 33 and the housing 31.

[0189] In this embodiment, the battery cell 30 is further provided with a first seal 36. By arranging the first seal 36 in the accommodation space jointly formed by the terminal assembly 33 and the housing 31, and arranging the first seal 36 between the electrode terminal 331 of the terminal assembly 33 and the wall portion 311 of the housing 31, the first seal 36 can also seal the gap between the electrode terminal 331 and the wall portion 311, so that the first seal 36 can play a certain role in blocking the gas inside the housing 31, thereby alleviating the phenomenon that the gas inside the housing 31 overflows through the mounting hole 3111, and further reducing the risk of the gas in the accommodation space leaking through the terminal assembly 33.

[0190] According to some embodiments of the present application, referring to Figure 4 and Figure 5 As shown, along the first direction X, the projection of the terminal assembly 33 is located within the through hole 21. That is to say, in a plane perpendicular to the first direction X, the orthographic projection of the terminal assembly 33 is located within the area defined by the orthographic projection of the hole wall surface of the through hole 21.

[0191] In this embodiment, by setting the projection of the terminal assembly 33 in the first direction X to be located within the through hole 21, on the one hand, it is convenient for the terminal assembly 33 to be inserted into the through hole 21 along the first direction X, and on the other hand, the gas leaking from the inside of the battery cell 30 through the terminal assembly 33 is more likely to enter the first space 111 through the through hole 21, which is beneficial to further reducing the difficulty of the first space 111 collecting the gas leaking from the inside of the battery cell 30 through the terminal assembly 33, and is beneficial to further improving the effect of the first space 111 collecting the gas leaking from the inside of the battery cell 30 through the terminal assembly 33, so as to further alleviate the risk of the combustible gas in the gas leaking from the inside of the battery cell 30 spreading and diffusing in the second space 112 of the box body 10.

[0192] According to some embodiments of the present application, referring toFigure 5 As shown, along the first direction X, the wall portion 311 abuts against the spacer 20.

[0193] It should be noted that the structure in which the wall portion 311 and the spacer 20 abut against each other in the first direction X can be that the wall portion 311 directly abuts against the spacer 20 in the first direction X, or it can be a structure in which the wall portion 311 and the spacer 20 indirectly abut against each other through other components in the first direction X.

[0194] In this embodiment, by setting the wall portion 311 and the spacer 20 to be a structure that abuts against each other in the first direction X, the tightness of the assembly of the wall portion 311 of the outer shell 31 and the spacer 20 in the first direction X can be improved, which is beneficial to reducing the size of the gap between the wall portion 311 of the outer shell 31 and the spacer 20. Furthermore, it can effectively alleviate the phenomenon that the gas leaking through the terminal assembly 33 inside the battery cell 30 spreads from the gap between the wall portion 311 of the outer shell 31 and the spacer 20 into the second space 112, so that when the battery cell 30 undergoes thermal runaway, the risks of the battery 100 catching fire and exploding due to the contact between the thermal runaway gas or spark and the high-concentration combustible gas can be effectively reduced, thereby improving the use reliability of the battery 100.

[0195] In some embodiments, please continue to refer to Figure 5 As shown, along the first direction X, a second seal 40 is provided between the wall portion 311 and the spacer 20. The wall portion 311 abuts against the spacer 20 through the second seal 40. The second seal 40 is disposed around the terminal assembly 33, and the second seal 40 is configured to seal the gap between the wall portion 311 and the spacer 20.

[0196] Wherein, the second seal 40 is disposed between the wall portion 311 and the spacer 20 in the first direction X, such that the wall portion 311 and the spacer 20 are in a structure of indirectly abutting against each other through the second seal 40.

[0197] The second seal 40 is disposed around the terminal assembly 33, and the second seal 40 is configured to seal the gap between the wall portion 311 and the spacer 20. That is to say, the second seal 40 surrounds the outer peripheral side of the terminal assembly 33, and the second seal 40 can seal the gap between the wall portion 311 and the spacer 20 in the first direction X.

[0198] Exemplarily, the material of the second seal 40 can be various. For example, the material of the second seal 40 can be plastic, silica gel, rubber, etc.

[0199] In this embodiment, by providing a second seal 40 between the wall portion 311 of the outer shell 31 and the separator 20, the wall portion 311 of the outer shell 31 is configured to abut against the separator 20 through the second seal 40 in the first direction X, and the second seal 40 is configured to surround the outer peripheral side of the terminal assembly 33. Thus, the second seal 40 can seal the gap between the wall portion 311 of the outer shell 31 and the separator 20, so as to further improve the tightness of the mutual assembly of the wall portion 311 of the outer shell 31 and the separator 20 in the first direction X, which is beneficial to further reducing the phenomenon that the gas leaking from the battery cell 30 inside through the terminal assembly 33 spreads into the second space 112 through the gap between the wall portion 311 of the outer shell 31 and the separator 20, so that when the battery cell 30 has a thermal runaway, the risks such as the battery 100 catching fire and exploding caused by the contact between the thermal runaway gas or spark and the highly concentrated combustible gas can be further reduced, thereby further improving the use reliability of the battery 100.

[0200] According to some embodiments of the present application, referring to Figure 2 、 Figure 3 、 Figure 4 and Figure 7 as shown, the box body 10 may include a first box body 12 and a second box body 13 arranged along the first direction X. The first box body 12 and the second box body 13 are mutually covered and jointly define an assembly space 11. The separator 20 is connected to the inner surface of the first box body 12 facing the battery cell 30 in the first direction X, and the separator 20 and the first box body 12 jointly define a first space 111.

[0201] Among them, the separator 20 is connected to the inner surface of the first box body 12 facing the battery cell 30 in the first direction X. That is to say, the separator 20 is connected to the inner surface of the first box body 12 facing the assembly space 11, and the separator 20 and the inner surface of the first box body 12 jointly define a first space 111.

[0202] Exemplarily, the connection structure between the separator 20 and the first box body 12 can be various, such as, welding connection or bonding, etc.

[0203] In this embodiment, the box body 10 is provided with a first box body 12 and a second box body 13 arranged along the first direction X, and the first box body 12 and the second box body 13 are mutually covered and jointly define an assembly space 11. By arranging the separator 20 on the inner surface of the first box body 12 facing the battery cell 30 in the first direction X, the separator 20 and the first box body 12 can jointly define a first space 111. The battery 100 adopting this structure can reduce the assembly difficulty of the separator 20, and can reduce the difficulty of subsequent maintenance and replacement of the separator 20 for the battery 100, thereby reducing the manufacturing cost and later maintenance cost of the battery 100.

[0204] In some embodiments, as shown in Figure 3 and Figure 4 the second box body 13 has a bottom plate 131, and the bottom plate 131 and the separator 20 are arranged at intervals along the first direction X. Along the first direction X, the outer shell 31 is arranged between the separator 20 and the bottom plate 131, and the bottom plate 131 is configured to support the battery cell 30.

[0205] Wherein, the bottom plate 131 is a wall of the second box body 13 opposite to and spaced from the first box body 12 in the first direction X, so that the bottom plate 131 and the separator 20 connected to the inner surface of the first box body 12 can be arranged at intervals in the first direction X.

[0206] Along the first direction X, the outer shell 31 is arranged between the separator 20 and the bottom plate 131, that is to say, the separator 20 and the bottom plate 131 of the second box body 13 are respectively located on both sides of the outer shell 31 of the battery cell 30 in the first direction X.

[0207] Along the first direction X, the bottom plate 131 is configured to support the battery cell 30, that is, the first direction X is the gravity direction or an approximate gravity direction, and the battery cell 30 is a structure placed on the bottom plate 131, so that the bottom plate 131 is located at the bottom of the battery cell 30 in the first direction X.

[0208] In this embodiment, the bottom plate 131 of the second box body 13 and the separator 20 are arranged at intervals along the first direction X. By arranging the outer shell 31 of the battery cell 30 between the separator 20 and the bottom plate 131 in the first direction X, and the bottom plate 131 can support the battery cell 30 in the first direction X, so that the separator 20 is located above the battery cell 30 in the first direction X, so that the first space 111 jointly defined by the separator 20 and the first box body 12 is located above the battery cell 30 in the first direction X, so as to facilitate the gas leaking from the terminal assembly 33 of the battery cell 30 to directly enter the first space 111 through the through hole 21, which is beneficial to further reducing the difficulty of the first space 111 collecting the gas leaking from the inside of the battery cell 30 through the terminal assembly 33, and is beneficial to further improving the effect of the first space 111 collecting the gas leaking from the inside of the battery cell 30 through the terminal assembly 33.

[0209] According to some embodiments of the present application, referring to Figure 4 As shown, a first exhaust hole 14 is provided on the box body 10, and the first exhaust hole 14 communicates with the first space 111.

[0210] Among them, the first exhaust hole 14 penetrates through the inner surface and the outer surface of the box body 10, so that the first exhaust hole 14 can communicate the first space 111 and the outside of the box body 10.

[0211] It should be noted that in the embodiment where the box body 10 includes a first box body 12 and a second box body 13, and the separator 20 is connected to the inner surface of the first box body 12 facing the battery cell 30 and forms the first space 111, the first exhaust hole 14 is provided on the first box body 12.

[0212] In this embodiment, by providing the first exhaust hole 14 on the box body 10 that communicates with the first space 111, the first space 111 can communicate with the outside of the box body 10 through the first exhaust hole 14, so as to facilitate the gas collected in the first space 111 to be discharged from the box body 10, so as to realize that the combustible gas in the gas leaking from the inside of the battery cell 30 can be discharged from the box body 10 in time, and further can effectively relieve the phenomenon that the combustible gas in the gas leaking from the inside of the battery cell 30 accumulates in the first space 111 of the box body 10. On the one hand, when the battery cell 30 has a thermal runaway, it can further reduce the risks such as the battery 100 catching fire and exploding after the thermal runaway gas or spark contacts the high-concentration combustible gas. On the other hand, it can relieve the phenomenon that the gas in the first space 111 accumulates too much and cannot further collect the gas leaking from the inside of the battery cell 30 through the terminal assembly 33.

[0213] In some embodiments, referring to Figure 2 、 Figure 3 and Figure 4As shown, the battery 100 may further include a first valve 50 disposed at the first exhaust hole 14. The first valve 50 is configured to allow the gas in the first space 111 to escape from the box body 10 and prevent liquid from entering the first space 111.

[0214] Wherein, the first valve 50 is connected to the box body 10 and located at the first exhaust hole 14. The first valve 50 functions to allow the gas in the first space 111 to escape from the box body 10 and prevent liquid from entering the first space 111. The structure of the first valve 50 can be various. For example, the first valve 50 can be a waterproof breathable valve or a one-way breathable valve, etc.

[0215] In this embodiment, by providing the first valve 50 at the first exhaust hole 14 of the box body 10, and the first valve 50 is configured to allow the gas in the first space 111 to escape from the box body 10 and prevent liquid from entering the first space 111, thus while the gas in the first space 111 is discharged from the first space 111 through the first valve 50, it can also alleviate the phenomenon of liquid entering the first space 111 of the box body 10, which is beneficial to reducing the risks such as internal short circuit or damage of the battery 100 after the liquid enters the box body 10, and further can improve the use reliability and service life of the battery 100.

[0216] According to some embodiments of the present application, referring to Figure 3 、 Figure 4 and Figure 8 As shown, the battery cell 30 may further include a pressure relief component 35 disposed on the outer shell 31. The pressure relief component 35 is configured to relieve the internal pressure of the battery cell 30, and the pressure relief component 35 is located in the second space 112.

[0217] Wherein, the pressure relief component 35 functions to relieve the internal pressure of the battery cell 30 when the internal pressure or temperature of the battery cell 30 reaches a predetermined value. Optionally, the pressure relief component 35 may be disposed on the wall portion 311 of the outer shell 31, that is, the pressure relief component 35 and the terminal assembly 33 are both disposed at the same end of the outer shell 31 in the first direction X. Of course, the pressure relief component 35 may also be disposed on other walls of the outer shell 31.

[0218] Exemplarily, in Figure 8 , the pressure relief component 35 is disposed on the wall portion 311 of the outer shell 31. Similarly, the pressure relief component 35 and the outer shell 31 may be of an integrally formed structure or a separately disposed structure. Exemplarily, in Figure 8In [the above structure], the pressure relief component 35 and the housing 31 are separately arranged, that is, the pressure relief component 35 and the housing 31 are of a split structure. The pressure relief component 35 can be connected to the housing 31 by means such as welding. Correspondingly, the pressure relief component 35 can be components such as an explosion-proof valve, an explosion-proof sheet, a gas valve, a pressure relief valve or a safety valve. Of course, in other embodiments, the pressure relief component 35 and the housing 31 can also be of an integrally formed structure, that is, the pressure relief component 35 and the housing 31 are of an integral structure. The pressure relief component 35 can be an area on the housing 31 where a weak structure is formed. For example, the pressure relief component 35 can be an area on the wall of the housing 31 where a notch groove is provided.

[0219] The pressure relief component 35 is located in the second space 112. That is to say, when the battery cell 30 undergoes thermal runaway, the thermal runaway gas inside the battery cell 30 discharged by the pressure relief component 35 can enter the second space 112.

[0220] In this embodiment, a pressure relief component 35 is provided on the housing 31 of the battery cell 30, so that when the battery cell 30 undergoes thermal runaway, the internal pressure of the battery cell 30 can be discharged through the pressure relief component 35 to reduce the risk of explosion and the like of the battery cell 30. Among them, by setting the pressure relief component 35 of the battery cell 30 to be located in the second space 112, the thermal runaway gas discharged by the battery cell 30 through the pressure relief component 35 can enter the second space 112, so that the combustible gas in the gas leaked from the inside of the battery cell 30 collected in the first space 111 through the terminal assembly 33 can be separated from the thermal runaway gas discharged by the pressure relief component 35 of the battery cell 30. Thus, when the battery cell 30 undergoes thermal runaway, the risk of the battery 100 catching fire and exploding after the thermal runaway gas contacts the combustible gas can be effectively reduced, so as to reduce the safety hazards during the use of the battery 100, and further contribute to improving the use reliability of the battery 100.

[0221] According to some embodiments of the present application, referring to Figure 8 As shown, the separator 20 and the wall portion 311 are arranged facing each other in the first direction X, and the pressure relief component 35 is provided on the wall portion 311. That is to say, both the pressure relief component 35 and the terminal assembly 33 are provided on one end of the housing 31 facing the separator 20 in the first direction X.

[0222] In this embodiment, by disposing both the pressure relief component 35 of the battery cell 30 and the terminal assembly 33 of the battery cell 30 on the wall portion 311 of the housing 31, so that the pressure relief component 35 and the terminal assembly 33 are disposed at the same end of the housing 31 in the first direction X, thereby enabling the pressure relief component 35 and the terminal assembly 33 to share a part of the space in the first direction X, which is beneficial to optimizing the spatial structure of the battery cell 30 to save the space occupied by the battery cell 30 in the first direction X, and can reduce the difficulty of assembling the battery cell 30 into the box body 10.

[0223] According to some embodiments of the present application, in combination with Figure 6 、 Figure 7 and Figure 8 As shown, along the first direction X, an avoidance space 22 is formed in the area of the separator 20 corresponding to the pressure relief component 35. The avoidance space 22 communicates with the second space 112 and does not communicate with the first space 111.

[0224] Among them, in Figure 6 , the avoidance space 22 is a notch provided on the separator 20, and the notch penetrates the separator 20 along the first direction X. Of course, in other embodiments, the avoidance space 22 may also be a groove provided on the side of the separator 20 facing the pressure relief component 35 in the first direction X.

[0225] In this embodiment, by providing the avoidance space 22 that communicates with the second space 112 and does not communicate with the first space 111 at the position of the separator 20 corresponding to the pressure relief component 35 along the first direction X, when the pressure relief component 35 releases the internal pressure of the battery cell 30, the shielding and blocking of the pressure relief component 35 by the separator 20 can be reduced, which is beneficial to improving the smoothness of the pressure relief component 35 in releasing the internal pressure of the battery cell 30, and it is convenient for the thermal runaway gas released by the pressure relief component 35 to enter the second space 112 through the avoidance space 22, which is beneficial to alleviating the phenomenon that the thermal runaway gas released by the pressure relief component 35 enters the first space 111.

[0226] In some embodiments, along the first direction X, the projection of the pressure relief component 35 is located within the avoidance space 22.

[0227] In this embodiment, by setting the projection of the pressure relief component 35 in the first direction X to be located within the avoidance space 22, the whole of the pressure relief component 35 can be disposed corresponding to the avoidance space 22 in the first direction X, so that when the pressure relief component 35 releases the internal pressure of the battery cell 30, the shielding and blocking of the pressure relief component 35 by the separator 20 can be further reduced, which is beneficial to further improving the smoothness of the pressure relief component 35 in releasing the internal pressure of the battery cell 30.

[0228] It should be noted that the structure of the battery cell 30 is not limited to this. In some embodiments, the battery cell 30 may also be other structures, for example, the isolating member 20 and the wall portion 311 are arranged facing each other in the first direction X, and the pressure relief component 35 is arranged at one end of the housing 31 away from the wall portion 311 along the first direction X. That is, after the battery cell 30 is assembled into the box body 10, the terminal assembly 33 of the battery cell 30 is arranged at one end of the housing 31 facing the isolating member 20 in the first direction X, and the pressure relief component 35 of the battery cell 30 is arranged at one end of the housing 31 away from the isolating member 20 in the first direction X, so that the terminal assembly 33 and the pressure relief component 35 are respectively located on both sides of the housing 31 of the battery cell 30 in the first direction X. In this embodiment, an exhaust channel, an exhaust groove or an exhaust cavity may be arranged on the wall of the box body 10 opposite to the pressure relief component 35, and the exhaust channel, the exhaust groove or the exhaust cavity is connected to the second space 112.

[0229] In this embodiment, by arranging the pressure relief component 35 at one end of the outer shell 31 away from the wall portion 311 in the first direction X, the pressure relief component 35 of the battery cell 30 and the terminal assembly 33 of the battery cell 30 are respectively located at both ends of the outer shell 31 in the first direction X. On the one hand, the interference between the terminal assembly 33 and the pressure relief component 35 can be reduced, and on the other hand, the risk of contact between the thermal runaway gas released by the pressure relief component 35 and the combustible gas in the gas leaked from the terminal assembly 33 inside the battery cell 30 can be further reduced.

[0230] According to some embodiments of the present application, see Figure 4 and Figure 7 As shown, a second exhaust hole 15 is provided on the box body 10 , and the second exhaust hole 15 is communicated with the second space 112 .

[0231] The second exhaust hole 15 penetrates the inner surface and the outer surface of the box body 10 , so that the second exhaust hole 15 can communicate with the second space 112 and the outside of the box body 10 .

[0232] It should be noted that in the embodiment where the box body 10 includes a first box body 12 and a second box body 13, and the isolating member 20 is connected to the inner surface of the first box body 12 facing the battery cell 30 and forms the first space 111, the second exhaust hole 15 can be provided on the first box body 12 or on the second box body 13. Figure 4 and Figure 7 In the embodiment, the second exhaust hole 15 is disposed on the first box body 12 .

[0233] In this embodiment, by providing a second exhaust hole 15 on the box body 10 that communicates with the second space 112, the second space 112 can communicate with the outside of the box body 10 through the second exhaust hole 15, thereby facilitating the discharge of the thermal runaway gas discharged by the pressure relief component 35 of the battery cell 30 from the box body 10, so as to enable the thermal runaway gas discharged by the pressure relief component 35 of the battery cell 30 to be discharged from the box body 10 in a timely manner, and further effectively alleviate the phenomenon that the thermal runaway gas discharged by the pressure relief component 35 of the battery cell 30 accumulates in the second space 112 of the box body 10, which is beneficial to further reduce the risk of fire and explosion of the battery 100 caused by the contact between the thermal runaway gas discharged by the pressure relief component 35 of the battery cell 30 and the combustible gas in the gas leaked from the terminal assembly 33 inside the battery cell 30.

[0234] In some embodiments, referring to Figure 3 and Figure 4 as shown, the battery 100 may further include a second valve 60. The second valve 60 is disposed at the second exhaust hole 15 and is configured to discharge the internal pressure of the second space 112.

[0235] Wherein, the second valve 60 is connected to the box body 10 and is located at the second exhaust hole 15. The second valve 60 functions to discharge the internal pressure of the box body 10 when the internal pressure or temperature of the second space 112 of the box body 10 reaches a predetermined value.

[0236] Exemplarily, the structure of the second valve 60 can be various. For example, the second valve 60 can be an explosion-proof valve, a gas valve, a pressure relief valve, a safety valve, etc.

[0237] In this embodiment, the battery 100 is further provided with a second valve 60, and the second valve 60 is disposed at the second exhaust hole 15 of the box body 10, so that the second valve 60 can discharge the internal pressure of the second space 112 of the box body 10 when the air pressure or temperature in the second space 112 reaches a threshold value, so as to reduce the risk of explosion or bursting of the battery 100 during use.

[0238] According to some embodiments of the present application, the present application further provides an electrical device. The electrical device includes the battery 100 of any of the above solutions, and the battery 100 is used to provide electrical energy for the electrical device.

[0239] Wherein, the electrical device can be any of the foregoing devices or systems that apply the battery 100.

[0240] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0241] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A box body, with an assembly space formed inside; an isolating member, disposed in the assembly space and connected to the box body, the isolating member being configured to separate the assembly space into a first space and a second space, the isolating member being provided with a through hole connecting the first space and the second space, the through hole penetrating the isolating member along a first direction; as well as A battery cell, comprising a housing, an electrode assembly and a terminal assembly, wherein the housing is accommodated in the second space, the housing has a wall portion, the wall portion is provided with a mounting hole, the electrode assembly is arranged in the housing, the terminal assembly is installed on the wall portion and covers the mounting hole, and the terminal assembly is electrically connected to the electrode assembly; Wherein, along the first direction, the isolation member is arranged on the outside of the wall portion, and the terminal assembly is inserted into the through hole.

2. The battery according to claim 1, characterized in that The terminal assembly comprises: an electrode terminal, located outside the wall portion, with at least a portion of a projection of the electrode terminal in the first direction located within the mounting hole, the electrode terminal being electrically connected to the electrode assembly; a connecting member connected to the wall portion, wherein the connecting member is configured to fasten the electrode terminal to the wall portion; An insulating member is disposed between the electrode terminal and the connecting member, and is configured to insulate and isolate the electrode terminal from the connecting member.

3. The battery according to claim 2, characterized in that The terminal assembly and the housing together form a receiving space for receiving the electrode assembly, and the terminal assembly has an exposed surface exposed to the outside of the battery cell and an inner side surface facing the receiving space; A first contact interface is formed between the insulating member and the electrode terminal, the first contact interface having a first starting end and a first terminating end, a second contact interface is formed between the insulating member and the connecting member, the second contact interface having a second starting end and a second terminating end, the first starting end and the second starting end are both located on the inner side surface, and the first terminating end and the second terminating end are both located on the exposed surface; Wherein, the first termination end is located in the through hole or the first space; and / or A projection of the second terminating end in the first direction is located within the through hole.

4. The battery according to claim 2, characterized in that The terminal assembly and the housing together form a receiving space for receiving the electrode assembly, a first contact interface is formed between the insulating member and the electrode terminal, and a second contact interface is formed between the insulating member and the connecting member; The first space is configured to collect gas leaked from the accommodation space through the first contact interface and the second contact interface, the first contact interface has a first terminal end away from the accommodation space in the leakage direction of the gas, and the second contact interface has a second terminal end away from the accommodation space in the leakage direction of the gas; Wherein, the first termination end is located in the through hole or the first space; and / or A projection of the second terminating end in the first direction is located within the through hole.

5. The battery according to claim 1, characterized in that The terminal assembly comprises: An electrode terminal, partially inserted into the mounting hole, the electrode terminal being electrically connected to the electrode assembly; An insulating member is located on a side of the wall portion away from the electrode assembly along the first direction, and the insulating member is disposed between the electrode terminal and the wall portion, and is configured to insulate and isolate the electrode terminal from the wall portion.

6. The battery according to claim 5, characterized in that The terminal assembly and the housing together form a receiving space for receiving the electrode assembly, and the terminal assembly has an exposed surface exposed to the outside of the battery cell; A first contact interface is formed between the insulating member and the electrode terminal, the first contact interface having a first starting end and a first terminating end, a second contact interface is formed between the insulating member and the wall portion, the second contact interface having a second starting end and a second terminating end, the first terminating end and the second terminating end are both located on the exposed surface, the first starting end is closer to the accommodation space than the first terminating end, and the second starting end is closer to the accommodation space than the second terminating end; Wherein, the first termination end is located in the through hole or the first space; and / or A projection of the second terminating end in the first direction is located within the through hole.

7. The battery according to claim 5, characterized in that The terminal assembly and the housing together form a receiving space for receiving the electrode assembly, a first contact interface is formed between the insulating member and the electrode terminal, and a second contact interface is formed between the insulating member and the wall portion; The first space is configured to collect gas leaked from the accommodation space through the first contact interface and the second contact interface, the first contact interface has a first terminal end away from the accommodation space in the leakage direction of the gas, and the second contact interface has a second terminal end away from the accommodation space in the leakage direction of the gas; Wherein, the first termination end is located in the through hole or the first space; and / or A projection of the second terminating end in the first direction is located within the through hole.

8. The battery according to claim 1, characterized in that The terminal assembly and the housing together form a receiving space for receiving the electrode assembly, the terminal assembly includes an electrode terminal, at least a portion of the projection of the electrode terminal in the first direction is located in the mounting hole, and the electrode terminal is electrically connected to the electrode assembly; The battery cell further includes a first sealant, which is located in the accommodation space and disposed between the electrode terminal and the wall portion, and is configured to seal a gap between the electrode terminal and the wall portion.

9. The battery according to claim 1, characterized in that Along the first direction, the projection of the terminal assembly is located within the through hole.

10. The battery according to claim 1, characterized in that Along the first direction, the wall portion abuts against the isolation member.

11. The battery according to claim 10, characterized in that Along the first direction, a second seal is arranged between the wall portion and the isolating member, the wall portion abuts against the isolating member through the second seal, the second seal is arranged around the terminal assembly, and the second seal is configured to seal the gap between the wall portion and the isolating member.

12. The battery according to claim 1, characterized in that The box body comprises a first box body and a second box body arranged along the first direction, the first box body and the second box body cover each other and jointly define the assembly space; The isolating member is connected to an inner surface of the first box body facing the battery cell in the first direction, and the isolating member and the first box body together define the first space.

13. The battery according to claim 12, characterized in that The second box body has a bottom plate, and the bottom plate and the isolation member are spaced apart along the first direction; Wherein, along the first direction, the housing is disposed between the isolation member and the bottom plate, and the bottom plate is configured to support the battery cell.

14. The battery according to claim 1, characterized in that The box body is provided with a first exhaust hole, and the first exhaust hole is communicated with the first space.

15. The battery according to claim 14, characterized in that The battery also includes: The first valve is disposed at the first exhaust hole, and the first valve is configured to allow gas in the first space to be discharged from the box body and to prevent liquid from entering the first space.

16. The battery according to any one of claims 1 to 15, characterized in that The battery cell further comprises: a pressure relief component, disposed on the housing, the pressure relief component being configured to release the internal pressure of the battery cell; Wherein, the pressure relief component is located in the second space.

17. The battery according to claim 16, characterized in that The isolating member and the wall portion are arranged facing each other in the first direction, and the pressure relief component is arranged on the wall portion.

18. The battery according to claim 17, characterized in that Along the first direction, an escape space is formed in a region of the isolating member corresponding to the pressure relief component, the escape space is communicated with the second space, and the escape space is not communicated with the first space.

19. The battery according to claim 18, characterized in that Along the first direction, the projection of the pressure relief component is located in the avoidance space.

20. The battery according to claim 16, characterized in that The isolating member and the wall portion are arranged facing each other in the first direction. Along the first direction, the pressure relief component is arranged at an end of the housing away from the wall portion.

21. The battery according to claim 16, characterized in that The box body is provided with a second exhaust hole, and the second exhaust hole is communicated with the second space.

22. The battery according to claim 21, characterized in that The battery also includes: The second valve is disposed at the second exhaust hole, and the second valve is configured to release the internal pressure of the second space.

23. An electrical device, characterized in that: The invention comprises a battery as claimed in any one of claims 1 to 22, wherein the battery is used to provide electrical energy.

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