Battery and electric device

Abstract

A battery (100) and an electric device, relating to the technical field of batteries. The battery (100) comprises a case (10), a partition member (20), and a battery cell (30). An assembly space (11) is formed inside the case (10). The partition member (20) is configured to divide the assembly space (11) into a first space (111) and a second space (112), the partition member (20) is provided with a through hole (21) in communication with the first space (111) and the second space (112), and the through hole (21) extends through the partition member (20) in a first direction (X). The battery cell (30) comprises a housing (31), an electrode assembly (32), and a terminal assembly (33). The housing (31) is accommodated in the second space (112) and has a wall portion (311), the wall portion (311) is provided with a mounting hole (3111), the electrode assembly (32) is arranged in the housing (31), the terminal assembly (33) is mounted on the wall portion (311) and covers the mounting hole (3111), and the terminal assembly (33) is electrically connected to the electrode assembly (32); and the partition member (20) is arranged outside the wall portion (311) in the first direction (X), and the terminal assembly (33) is inserted into the through hole (21). This allows gas leaked from the interior of the battery cell (30) at the terminal assembly (33) to enter the first space (111) and be isolated from the second space (112) that accommodates the housing (31) of the battery cell (30), thereby helping to reduce risks such as ignition and explosion of the battery (100).

Description

Battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery and an electric device. BACKGROUND

[0002] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, the battery as a core component of new energy vehicles has higher requirements in terms of use stability and use reliability.

[0003] In the battery technology, the battery generally includes a box body and a battery monomer contained in the box body. In order to ensure the safety of the battery monomer, a pressure relief structure for relieving the internal pressure of the battery monomer is generally provided on the shell of the battery monomer, so that when the internal pressure or temperature of the battery monomer reaches a threshold value, the pressure relief structure can be actuated to relieve the internal pressure of the battery monomer. However, the existing pressure relief structure of the battery monomer is prone to cause the battery to catch fire or explode when relieving pressure, resulting in a large safety hazard in the use process of the battery, thereby being not conducive to improving the use reliability of the battery.

[0004] SUMMARY

[0005] The embodiments of the present application provide a battery and an electric device, which can effectively improve the use reliability of the battery.

[0006] In a first aspect, the embodiments of the present application provide a battery, which includes a box body, a partition and a battery monomer. The inside of the box body forms an assembly space. The partition is arranged in the assembly space and connected to the box body. The partition is configured to divide the assembly space into a first space and a second space. The partition is provided with a through hole communicating the first space and the second space. The through hole penetrates the partition along a first direction. The battery monomer includes a shell, an electrode assembly and a terminal assembly. The shell is contained in the second space. The shell has a wall portion provided with a mounting hole. The electrode assembly is arranged in the shell. The terminal assembly is mounted on the wall portion and covers the mounting hole. The terminal assembly is electrically connected with the electrode assembly. In the first direction, the partition is arranged outside the wall portion, and the terminal assembly is inserted into the through hole.

[0007] In the technical scheme, the partition is arranged in the box of the battery, the partition divides the assembly space in the box into a first space and a second space, and the partition is provided with a through hole penetrating the partition in the first direction. The partition is arranged outside the wall in the first direction, and the terminal assembly of the battery cell is inserted into the through hole in the first direction. Therefore, the gas leaked from the terminal assembly of the battery cell can enter the first space through the through hole during use of the battery, so that the gas leaked from the terminal assembly of the battery cell can be accommodated in the first space, thereby preventing the combustible gas in the gas leaked from the battery cell from spreading and diffusing in the second space in which the shell of the battery cell is accommodated. This can reduce the concentration of the combustible gas in the second space, thereby reducing the risk of fire and explosion of the battery caused by contact between the hot runaway gas or sparks and the combustible gas with high concentration when the battery cell is in thermal runaway, and improving the safety of the battery during use and the reliability of the battery.

[0008] In some embodiments, the terminal assembly includes an electrode terminal, a connecting piece and an insulating piece. The electrode terminal is located outside the wall, and at least part of the projection of the electrode terminal in the first direction is located in the mounting hole. The electrode terminal is electrically connected to the electrode assembly. The connecting piece is connected to the wall and is configured to fasten the electrode terminal to the wall. The insulating piece is arranged between the electrode terminal and the connecting piece and is configured to insulate and separate the electrode terminal and the connecting piece.

[0009] In the technical scheme, the terminal assembly includes an electrode terminal, a connecting piece and an insulating piece. The electrode terminal is electrically connected to the electrode assembly to realize input or output of the electric energy of the battery cell. The electrode terminal is fastened to the wall by the connecting piece to realize assembly of the electrode terminal on the wall. The insulating piece is arranged between the electrode terminal and the connecting piece to insulate and separate the connecting piece and the electrode terminal, thereby reducing the risk of short circuit of the electrode terminal. Therefore, the gas leaked from the contact interface between the electrode terminal and the insulating piece or the contact interface between the insulating piece and the connecting piece in the battery cell can be accommodated in the first space by arranging the terminal assembly in the through hole in the first direction.

[0010] In some embodiments, the terminal assembly and the housing jointly form an accommodation space for accommodating the electrode assembly, the terminal assembly has an exposed surface exposed to the outside of the battery monomer and an inner surface facing the accommodation 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 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.

[0011] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and gas inside the battery monomer is prone to leak from the first contact interface. By setting the first ending end of the first contact interface, which is located on the exposed surface of the terminal assembly, to be located in the through hole or the first space, the gas leaked from the first contact interface is facilitated to enter the first space, thereby facilitating further improvement of the effect of the first space in collecting the gas leaked from the battery monomer through the terminal assembly, and further relieving the phenomenon of the combustible gas in the leaked gas inside the battery monomer spreading and diffusing in the second space of the box. Similarly, a second contact interface is formed between the insulating member and the connecting member, and gas inside the battery monomer is prone to leak from the second contact interface. By setting the second ending end of the second contact interface, which is located on the exposed surface of the terminal assembly, to have a projection located in the through hole in the first direction, the gas leaked from the second contact interface is facilitated to enter the first space, thereby facilitating further improvement of the effect of the first space in collecting the gas leaked from the battery monomer through the terminal assembly, and further relieving the phenomenon of the combustible gas in the leaked gas inside the battery monomer spreading and diffusing in the second space of the box.

[0012] In some embodiments, the terminal assembly and the housing jointly form an accommodation space for accommodating 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 ending end away from the accommodation space in the leakage direction of the gas, and the second contact interface has a second ending end away from the accommodation space in the leakage direction of the gas; 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.

[0013] In the above technical solution, the first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery monomer is prone to leak from the first contact interface. By arranging the first contact interface, which is away from the first terminal end of the accommodation space in the gas leakage direction, to be located in the through hole or the first space, the gas leaked from the first contact interface is facilitated to enter the first space, thereby further improving the effect of the first space collecting the gas leaked from the terminal assembly inside the battery monomer, and further alleviating the phenomenon that the flammable gas in the gas leaked from the battery monomer spreads and diffuses in the second space of the box. Similarly, the second contact interface is formed between the insulating member and the connecting member, and the gas inside the battery monomer is prone to leak from the second contact interface. By arranging the second contact interface, which is away from the second terminal end of the accommodation space in the gas leakage direction, to have a projection in the first direction located in the through hole, the gas leaked from the second contact interface is facilitated to enter the first space, thereby further improving the effect of the first space collecting the gas leaked from the terminal assembly inside the battery monomer, and further alleviating the phenomenon that the flammable gas in the gas leaked from the battery monomer spreads and diffuses in the second space of the box.

[0014] In some embodiments, the terminal assembly includes an electrode terminal and an insulating member; a portion of the electrode terminal is arranged in 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 arranged 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.

[0015] 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 the electric energy of the battery monomer. By arranging the insulating member between the electrode terminal and the wall portion, the insulating member can insulate and isolate the wall portion and the electrode terminal, thereby reducing the risk of short circuit of the electrode terminal. Therefore, by arranging the terminal assembly to be inserted into the through hole along the first direction, the gas leaked from the contact interface between the electrode terminal and the insulating member or the contact interface between the insulating member and the wall portion inside the battery monomer can be accommodated in the first space.

[0016] In some embodiments, the terminal assembly and the housing collectively form an accommodation space for accommodating the electrode assembly, 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 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, the first ending end and the second ending end are both located on the exposed surface, the first starting end is closer to the accommodation space than the first ending end, and the second starting end is closer to the accommodation 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.

[0017] In the above technical solution, a first contact interface is formed between the insulating member and the electrode terminal, and gas inside the battery cell is prone to leak from the first contact interface. By setting the first ending end of the first contact interface, which is located on the exposed surface of the terminal assembly, to be located in the through hole or the first space, the gas leaked from the first contact interface is facilitated to enter the first space, thereby facilitating further improvement of the effect of the first space collecting the gas leaked from the battery cell through the terminal assembly, and further alleviating the phenomenon of the flammable gas in the leaked gas inside the battery cell spreading and diffusing in the second space of the box. Similarly, a second contact interface is formed between the insulating member and the wall portion, and gas inside the battery cell is prone to leak from the second contact interface. By setting the second ending end of the second contact interface, which is located on the exposed surface of the terminal assembly, to be located in the through hole in the projection in the first direction, the gas leaked from the second contact interface is facilitated to enter the first space, thereby facilitating further improvement of the effect of the first space collecting the gas leaked from the battery cell through the terminal assembly, and further alleviating the phenomenon of the flammable gas in the leaked gas inside the battery cell spreading and diffusing in the second space of the box.

[0018] In some embodiments, the terminal assembly and the housing collectively form an accommodation space for accommodating 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 ending end away from the accommodation space in the direction of gas leakage, and the second contact interface has a second ending end away from the accommodation space in the direction of gas leakage; 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.

[0019] In the technical solution, the first contact interface is formed between the insulating member and the electrode terminal, and the gas inside the battery monomer is prone to leak from the first contact interface. By arranging the first contact interface, which is away from the first terminal end of the accommodation space in the gas leakage direction, to be located in the through hole or the first space, the gas leaked from the first contact interface is facilitated to enter the first space, thereby further improving the effect of the first space in collecting the gas leaked from the terminal assembly inside the battery monomer, and further relieving the phenomenon that the flammable gas in the gas leaked from the battery monomer spreads and diffuses in the second space of the box. Similarly, the second contact interface is formed between the insulating member and the wall portion, and the gas inside the battery monomer is prone to leak from the second contact interface. By arranging the second contact interface, which is away from the second terminal end of the accommodation space in the gas leakage direction, to have a projection in the first direction located in the through hole, the gas leaked from the second contact interface is facilitated to enter the first space, thereby further improving the effect of the first space in collecting the gas leaked from the terminal assembly inside the battery monomer, and further relieving the phenomenon that the flammable gas in the gas leaked from the battery monomer spreads and diffuses in the second space of the box.

[0020] In some embodiments, the terminal assembly and the shell jointly form an accommodation space for accommodating the electrode assembly, the terminal assembly includes an electrode terminal, at least a portion of a projection of the electrode terminal in the first direction is located in the mounting hole, and the electrode terminal is electrically connected with the electrode assembly; wherein the battery monomer further includes a first sealing member, the first sealing member is located in the accommodation space, and the first sealing member is arranged between the electrode terminal and the wall portion, and the first sealing member is configured to seal a gap between the electrode terminal and the wall portion.

[0021] In the technical solution, the battery monomer further includes a first sealing member. By arranging the first sealing member in the accommodation space jointly formed by the terminal assembly and the shell, and arranging the first sealing member between the electrode terminal of the terminal assembly and the wall portion of the shell, the first sealing member can also seal the gap between the electrode terminal and the wall portion, so that the first sealing member can play a certain blocking role on the gas inside the shell, thereby relieving the phenomenon that the gas inside the shell overflows through the mounting hole, and further reducing the risk of gas leakage in the accommodation space through the terminal assembly.

[0022] In some embodiments, along the first direction, a projection of the terminal assembly is located in the through hole.

[0023] In the technical solution, the projection of the terminal assembly in the first direction is arranged in the through hole. On the one hand, the terminal assembly is conveniently inserted into the through hole in the first direction. On the other hand, the gas leaked from the battery monomer through the terminal assembly is more easily guided into the first space through the through hole, thereby facilitating the collection of the gas leaked from the battery monomer through the terminal assembly in the first space, improving the effect of the collection of the gas leaked from the battery monomer through the terminal assembly in the first space, and further reducing the risk of the combustible gas leaked from the battery monomer spreading and diffusing in the second space of the box.

[0024] In some embodiments, the wall portion and the partition abut each other in the first direction.

[0025] In the technical solution, the wall portion and the partition abut each other in the first direction. Therefore, the tightness of the assembly of the wall portion and the partition in the first direction is improved, the size of the gap between the wall portion and the partition is reduced, the gas leaked from the battery monomer through the terminal assembly is prevented from spreading from the gap between the wall portion and the partition into the second space, the risk of the combustible gas leaked from the battery monomer contacting the hot gas or sparks after the thermal runaway of the battery monomer is reduced, and the safety of the battery is improved.

[0026] In some embodiments, a second seal is arranged between the wall portion and the partition in the first direction, the wall portion abuts the partition through the second seal, the second seal surrounds the terminal assembly, and the second seal is configured to seal the gap between the wall portion and the partition.

[0027] In the technical solution, the second seal is arranged between the wall portion and the partition of the housing. The wall portion of the housing abuts the partition in the first direction through the second seal. The second seal surrounds the outer periphery of the terminal assembly. Therefore, the gap between the wall portion and the partition of the housing is sealed by the second seal. The tightness of the assembly of the wall portion and the partition in the first direction is further improved. The gas leaked from the battery monomer through the terminal assembly is prevented from spreading from the gap between the wall portion and the partition into the second space. The risk of the combustible gas leaked from the battery monomer contacting the hot gas or sparks after the thermal runaway of the battery monomer is further reduced. The safety of the battery is further improved.

[0028] In some embodiments, 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 are mutually covered and jointly define the assembly space; wherein the isolation member is connected to the inner surface of the first box body facing the battery monomer in the first direction, and the isolation member and the first box body jointly define the first space.

[0029] 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 are mutually covered and jointly define the assembly space. By arranging the isolation member on the inner surface of the first box body facing the battery monomer in 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 can reduce the difficulty of subsequent maintenance and replacement of the isolation member, thereby reducing the manufacturing cost and later maintenance cost of the battery.

[0030] In some embodiments, the second box body has a bottom plate, and the bottom plate and the isolation member are arranged in the first direction; wherein, along the first direction, the shell is arranged between the isolation member and the bottom plate, and the bottom plate is configured to support the battery monomer.

[0031] In the above technical solution, the bottom plate of the second box body and the isolation member are arranged in the first direction. By arranging the shell of the battery monomer between the isolation member and the bottom plate in the first direction, and the bottom plate can support the battery monomer in the first direction, the isolation member is arranged above the battery monomer in the first direction, so that the first space jointly defined by the isolation member and the first box body is above the battery monomer in the first direction, thereby facilitating the gas leaked from the terminal assembly of the battery monomer to directly enter the first space through the through hole, which is conducive to further reducing the difficulty of the first space collecting the gas leaked from the terminal assembly of the battery monomer, and is conducive to further improving the effect of the first space collecting the gas leaked from the terminal assembly of the battery monomer.

[0032] In some embodiments, the box body is provided with a first exhaust hole, and the first exhaust hole is in communication with the first space.

[0033] In the technical solution, the first space is communicated with the outside of the box through the first exhaust hole, so that the gas collected in the first space can be discharged from the box, and the combustible gas in the gas leaked from the battery monomer can be discharged from the box in time, thereby effectively relieving the accumulation of the combustible gas in the first space, reducing the risk of fire and explosion of the battery caused by the contact between the thermal runaway gas and the high-concentration combustible gas, and relieving the phenomenon that the gas in the first space cannot be further collected due to the excessive accumulation of the gas leaked from the battery monomer through the terminal assembly.

[0034] In some embodiments, the battery further comprises a first valve; the first valve is arranged at the first exhaust hole, and the first valve is configured to allow the gas in the first space to be discharged from the box and to prevent liquid from entering the first space.

[0035] In the technical solution, the first valve is arranged at the first exhaust hole of the box, and the first valve is configured to allow the gas in the first space to be discharged from the box and to prevent liquid from entering the first space, so that the gas in the first space can be discharged from the first space through the first valve while relieving the phenomenon of liquid entering the first space of the box, reducing the risk of internal short circuit or damage of the battery caused by the liquid entering the box, and improving the use reliability and service life of the battery.

[0036] In some embodiments, the battery monomer further comprises a pressure relief component; the pressure relief component is arranged on the shell, and the pressure relief component is configured to release the internal pressure of the battery monomer; wherein the pressure relief component is located in the second space.

[0037] In the technical solution, the pressure relief component is arranged on the shell of the battery monomer, so that the battery monomer can release the internal pressure of the battery monomer through the pressure relief component when thermal runaway occurs, thereby reducing the risk of explosion of the battery monomer, wherein the pressure relief component of the battery monomer is arranged in the second space, so that the thermal runaway gas released from the battery monomer through the pressure relief component can enter the second space, and the combustible gas in the gas leaked from the battery monomer through the terminal assembly and collected in the first space can be separated from the thermal runaway gas released from the battery monomer through the pressure relief component, thereby effectively reducing the risk of fire and explosion of the battery caused by the contact between the thermal runaway gas and the combustible gas when the battery monomer is in thermal runaway, reducing the safety hazard of the battery during use, and further improving the use reliability of the battery.

[0038] In some embodiments, the partition is arranged to face the wall portion in the first direction, and the pressure relief component is arranged on the wall portion.

[0039] In the above technical solution, the pressure relief component and the terminal assembly of the battery cell are both arranged on the wall portion of the shell, so that the pressure relief component and the terminal assembly are arranged on the same side of the shell in the first direction, thereby enabling the pressure relief component and the terminal assembly to share part of the space in the first direction, which is conducive to optimizing the space structure of the battery cell, saving the space occupied by the battery cell in the first direction, and facilitating the assembly of the battery cell into the box.

[0040] In some embodiments, along the first direction, the partition forms an avoidance space corresponding to the area of the pressure relief component, the avoidance space is in communication with the second space, and the avoidance space is not in communication with the first space.

[0041] In the above technical solution, by arranging the avoidance space in communication with the second space and not in communication with the first space at the position of the partition corresponding to the pressure relief component in the first direction, the shielding and blocking of the partition to the pressure relief component can be reduced when the pressure relief component releases the internal pressure of the battery cell, which is conducive to improving the smoothness of the pressure relief component releasing the internal pressure of the battery cell, and facilitating the thermal runaway gas released by the pressure relief component to enter the second space through the avoidance space, which is conducive to alleviating the phenomenon of the thermal runaway gas released by the pressure relief component entering the first space.

[0042] In some embodiments, along the first direction, a projection of the pressure relief component is located in the avoidance space.

[0043] In the above technical solution, by arranging the projection of the pressure relief component in the first direction to be located in the avoidance space, the whole pressure relief component can be arranged corresponding to the avoidance space in the first direction, thereby further reducing the shielding and blocking of the partition to the pressure relief component when the pressure relief component releases the internal pressure of the battery cell, which is conducive to further improving the smoothness of the pressure relief component releasing the internal pressure of the battery cell.

[0044] In some embodiments, the partition is arranged to face the wall portion in the first direction, and along the first direction, the pressure relief component is arranged at an end of the shell away from the wall portion.

[0045] In the technical solution, the pressure relief component is arranged at one end of the shell away from the wall portion in the first direction, so that the pressure relief component of the battery cell and the terminal assembly of the battery cell are respectively located at two ends of the shell in the first direction. On the one hand, the interference between the terminal assembly and the pressure relief component can be reduced. On the other hand, the risk of mutual contact between the flammable gas in the gas leaked from the terminal assembly and the thermal runaway gas discharged by the pressure relief component of the battery cell can be further reduced.

[0046] In some embodiments, the box is provided with a second exhaust hole in communication with the second space.

[0047] In the technical solution, the second exhaust hole in communication with the second space is arranged on the box, so that the second space can communicate with the outside of the box through the second exhaust hole. Therefore, the thermal runaway gas discharged by the pressure relief component of the battery cell can be discharged from the box in time, so as to effectively alleviate the accumulation of the thermal runaway gas discharged by the pressure relief component of the battery cell in the second space of the box. This is conducive to further reducing the risk of fire and explosion of the battery caused by the contact between the flammable gas in the gas leaked from the terminal assembly and the thermal runaway gas discharged by the pressure relief component of the battery cell.

[0048] In some embodiments, the battery further comprises 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.

[0049] In the technical solution, the battery further comprises a second valve, and the second valve is arranged at the second exhaust hole of the box. Therefore, when the pressure or temperature in the second space reaches a threshold value, the second valve can discharge the internal pressure of the second space of the box, so as to reduce the risk of explosion or burst of the battery during use.

[0050] In a second aspect, the embodiments of the present application further provide a power utilization device, which comprises the battery described above and is configured to provide electric energy. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0052] FIG. 1 is a structural schematic view of a vehicle according to some embodiments of the present application;

[0053] Figure 2 is a schematic diagram of the battery structure provided in some embodiments of this application;

[0054] Figure 3 is an exploded view of the battery structure provided in some embodiments of this application;

[0055] Figure 4 is a cross-sectional view of a battery provided in some embodiments of this application;

[0056] Figure 5 is a magnified view of part A of the battery shown in Figure 4;

[0057] Figure 6 is a schematic diagram of the structure of the battery separator provided in some embodiments of this application;

[0058] Figure 7 is a schematic diagram of the assembly of the isolation component and the first box body provided in some embodiments of this application;

[0059] Figure 8 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0060] Figure 9 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0061] Figure 10 is a partial enlarged view of point B of the battery cell shown in Figure 9;

[0062] Figure 11 is a partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0063] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - Assembly space; 111 - First space; 112 - Second space; 12 - First housing body; 13 - Second housing body; 131 - Base plate; 14 - First vent; 15 - Second vent; 20 - Isolator; 21 - Through hole; 22 - Clearance space; 30 - Battery cell; 31 - Housing; 311 - Wall; 3111 - Mounting hole; 312 - Housing; 3121 - Opening; 313 - End cap; 32 - Electrode assembly; 33 - Terminal assembly; 331-Electrode terminal; 3311-First clamping part; 3312-Second clamping part; 332-Connector; 333-Insulator; 334-First contact interface; 3341-First starting end; 3342-First ending end; 335-Second contact interface; 3351-Second starting end; 3352-Second ending end; 34-Current collector; 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

[0064] In order to make the objects, 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 drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0066] In the present application, "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment to other embodiments.

[0067] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0068] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0069] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0070] In this application, "multiple" means two or more (including two).

[0071] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0072] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0073] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0075] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0076] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (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.).

[0077] As an example, the positive active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive active material can also be used. These positive active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (may also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of 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 (may also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (may also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (may also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (may also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (may also be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof, etc.

[0078] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with a positive active material, or of course can be provided with a positive active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0079] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0080] As an example, the negative current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel, or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0082] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0083] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone only one or in combination of two or more.

[0084] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0085] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0086] In some embodiments, the separator is a separator film. The separator film can be various, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0087] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes or can be attached to the surfaces of the positive and negative electrodes.

[0088] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0089] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid, gel, or solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0090] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium bisoxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorodioxalate phosphate.

[0091] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl 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, butanediol sulfone, 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, methyl tetrahydrofuran, diphenyl ether, and crown ether.

[0092] Among them, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0093] Among them, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0094] As an example, the polymer solid-state electrolyte can be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0095] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0096] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0097] In some embodiments, the electrode assembly is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0098] In some embodiments, the electrode assembly is in a stack structure.

[0099] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0100] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0101] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments that are stacked.

[0102] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0103] As an example, the separators can be continuously provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0104] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0105] In some embodiments, the electrode assembly is provided with a tab. The tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0106] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can 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.

[0107] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes, but is not limited to, a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, and a multi-prismatic battery cell such as a hexagonal battery cell, etc.

[0108] The battery referred to 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.

[0109] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0110] In some embodiments, the battery can be a battery pack, and the battery pack includes a box and battery cells, and the battery cells or battery modules are contained in the box.

[0111] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and longitudinal beam of the vehicle.

[0112] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0113] The battery has the outstanding advantages of high energy density, small environmental pollution, large power density, long service life, wide adaptation range, 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 many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters, and in addition, the safety of the battery also needs to be considered.

[0114] In the battery technology, a battery usually comprises a box body and a battery cell accommodated in the box body. In order to ensure the use safety of the battery cell, a pressure relief structure is usually arranged on the shell of the battery cell to release the internal pressure of the battery cell, thereby effectively improving the use safety of the battery cell. The battery cell comprises a shell, an electrode assembly, an electrolyte and an electrode terminal mounted on the shell. The electrode assembly and the electrolyte are accommodated in the shell. The shell is provided with a mounting hole communicating the inside and outside of the shell. The electrode terminal is mounted in the mounting hole, so that the electrode terminal can electrically connect the electrode assembly accommodated in the shell to realize the input or output of the electric energy of the battery cell. However, in the related art, the chemical reaction between the electrode assembly and the electrolyte or the decomposition of the electrolyte can cause a large amount of flammable gas to be generated in the shell of the battery cell. For example, the water molecules in the electrolyte can be decomposed into hydrogen gas. In particular, in a sodium battery, the flammable gas generated in the battery cell can easily overflow from the insulation interface or the sealing interface between the electrode terminal and the shell, thereby causing the flammable gas to spread and accumulate in the box body, which can easily lead to a large amount of flammable gas in the box body. After the thermal runaway of the battery cell, the flammable gas can easily cause the battery to catch fire or explode when it contacts the high-temperature gas generated by the thermal runaway of the battery cell or the sparks generated by the battery cell, thereby causing a large safety hazard in the use of the battery, and adversely affecting the use reliability of the battery.

[0115] Based on the above considerations, in order to solve the problem that the battery can easily catch fire or explode during use, the present application provides a battery. The battery comprises a box body, a partition and a battery cell. The inside of the box body forms an assembly space. The partition is arranged in the assembly space and connected to the box body. The partition is configured to divide the assembly space into a first space and a second space. The partition is provided with a through hole communicating the first space and the second space. The through hole penetrates the partition along a first direction. The battery cell comprises a shell, an electrode assembly and a terminal assembly. The shell is accommodated in the second space. The shell has a wall portion provided with a mounting hole. The electrode assembly is arranged in the shell. The terminal assembly is mounted on the wall portion and covers the mounting hole. The terminal assembly is electrically connected to the electrode assembly. Along the first direction, the partition is arranged outside the wall portion, and the terminal assembly is inserted into the through hole. The first space is configured to collect the gas leaked from the inside of the battery cell through the terminal assembly.

[0116] In the battery of the structure, by arranging the partition in the box of the battery, the partition separates the assembly space inside the box into a first space and a second space, and the partition is provided with a through hole penetrating the partition in the first direction, by arranging the partition to be located outside the wall part in the first direction, and inserting the terminal assembly of the battery monomer into the through hole in the first direction, so that the gas leaked from the terminal assembly of the battery monomer in the use process of the battery can enter the first space through the through hole, so that the gas leaked from the terminal assembly of the battery monomer in the use process of the battery can be accommodated in the first space, so that the leaked gas in the battery monomer can be separated from the second space containing the shell of the battery monomer, so as to alleviate the spread and diffusion of the flammable gas in the leaked gas in the battery monomer in the second space containing the shell of the battery monomer in the box, so as to reduce the phenomenon that the concentration of flammable gas in the second space is too high, and to effectively reduce the risk of fire and explosion of the battery caused by the contact between the thermal runaway gas or spark and the high concentration of flammable gas when the battery monomer appears thermal runaway, so as to reduce the safety hazard of the battery in the use process, and to improve the use reliability of the battery.

[0117] The battery disclosed in the embodiments of the present application can be used in electric devices such as vehicles, ships or aircrafts, etc. The power supply system of the electric device can be composed of the battery disclosed in the present application, so as to alleviate the problem that the battery is easy to catch fire or explode in the use process, and to improve the use reliability of the battery.

[0118] The embodiments of the present application provide an electric device using a battery as a power supply. The electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0119] The following embodiments are described with a vehicle as an example of an electric device of an embodiment of the present application for convenience of description.

[0120] Please refer to FIG. 1 and FIG. 2, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application, and FIG. 2 is a structural schematic diagram of a battery 100 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with the battery 100, which can be arranged at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to supply power for the vehicle 1000, for example, the battery 100 can be used as an operating power source or a use power source of the vehicle 1000, etc. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to supply power for the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0121] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a use power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0122] According to some embodiments of the present application, referring to FIG. 2, and further referring to FIG. 3, FIG. 4 and FIG. 5, FIG. 3 is an exploded view of the battery 100 provided by some embodiments of the present application, FIG. 4 is a sectional view of the battery 100 provided by some embodiments of the present application, and FIG. 5 is a partial enlarged view of A of the battery 100 shown in FIG. 4. The present application provides a battery 100, which includes a box body 10, a partition 20 and a battery monomer 30. The box body 10 has an assembly space 11 formed inside. The partition 20 is arranged in the assembly space 11 and connected to the box body 10, and the partition 20 is configured to divide the assembly space 11 into a first space 111 and a second space 112. The battery monomer 30 includes a shell 31, an electrode assembly 32 and a terminal assembly 33. The shell 31 is accommodated in the second space 112, and the shell 31 has a wall portion 311 provided with a mounting hole 3111. Along a first direction X, the partition 20 is arranged outside the wall portion 311, and the partition 20 faces the wall portion 311. The electrode assembly 32 is arranged in the shell 31, 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, and the first space 111 is configured to collect the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33.

[0123] The box body 10 is configured to provide an assembling space 11 for the battery monomer 30, and can have various structures. In some embodiments, the box body 10 can 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 overlapped with each other, and the first box body 12 and the second box body 13 together define the assembling space 11 for accommodating the battery monomer 30. The second box body 13 can be a hollow structure with one end open, and the first box body 12 can be a plate structure, the first box body 12 is overlapped with the open side of the second box body 13, so that the first box body 12 and the second box body 13 together define the assembling space 11; the first box body 12 and the second box body 13 can also be hollow structures with one side open, and the open side of the first box body 12 is overlapped with the open side of the second box body 13. For example, in FIGS. 2 and 3, the first box body 12 and the second box body 13 are both hollow structures with one side open, and the open side of the first box body 12 is overlapped with the open side of the second box body 13 along the first direction X.

[0124] Of course, the box body 10 formed by the first box body 12 and the second box body 13 can have various shapes, such as a cylinder, a cuboid, or a square, etc. For example, in FIG. 2, the shape of the box body 10 is a cuboid.

[0125] The isolation member 20 is arranged in the assembling space 11 and connected to the box body 10, and is configured to divide the assembling space 11 into a first space 111 and a second space 112, that is, the isolation member 20 is located inside the box body 10 and connected to the inner surface of the box body 10, so that the isolation member 20 divides the assembling space 11 inside the box body 10 into two independent spaces, i.e., the first space 111 and the second space 112.

[0126] Optionally, the structure to which the isolation member 20 is connected on the box body 10 can be various, such as welding connection, bolt connection, or adhesive connection, etc.

[0127] It should be noted that in the embodiments in which the box body 10 includes the first box body 12 and the second box body 13, the isolation member 20 can be connected to the inner surface of the first box body 12 facing the assembling space 11, or can be connected to the inner surface of the second box body 13 facing the assembling space 11. For example, in FIGS. 4 and 5, the isolation member 20 is connected to the inner surface of the first box body 12 facing the battery monomer 30 in the first direction X.

[0128] In the battery 100, the battery cell 30 arranged in the box body 10 can be one or multiple. When the battery cell 30 arranged in the box body 10 is multiple, the multiple battery cells 30 can be in series connection, parallel connection or mixed connection, and the mixed connection means that the multiple battery cells 30 are in both series connection and parallel connection. The multiple battery cells 30 can be directly connected in series, parallel or mixed connection, and then the whole of the multiple battery cells 30 is accommodated in the box body 10; of course, the battery 100 can also be that the multiple battery cells 30 are first connected in series, parallel or mixed connection to form a battery module, and then the multiple battery modules are connected in series, parallel or mixed connection to form a whole, and the whole is accommodated in the box body 10.

[0129] In some embodiments, the battery 100 can further include other structures, for example, the battery 100 can further include a busbar component for connecting the multiple battery cells 30 to realize the electrical connection between the multiple battery cells 30.

[0130] Each battery cell 30 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 30 can be in the shape of a cuboid, a cylinder, a prism or other shapes. For example, in FIG. 3, the battery cell 30 is in the shape of a cuboid.

[0131] The shell 31 of the battery cell 30 is accommodated in the second space 112, that is, the shell 31 of the battery cell 30 is located in the second space 112. For example, referring to FIGS. 4 and 5, and further referring to FIGS. 6 and 7, FIG. 6 is a structural schematic view of the isolation piece 20 of the battery 100 according to some embodiments of the present application, and FIG. 7 is an assembly schematic view of the isolation piece 20 and the first box body 12. The isolation piece 20 is provided with a through hole 21 penetrating the isolation piece 20 in the first direction X, and the through hole 21 communicates the first space 111 and the second space 112, so that the terminal assembly 33 of the battery cell 30 is inserted in 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 isolation piece 20 facing 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 isolation piece 20 facing the second space 112 in the first direction X.

[0132] Referring to FIG. 5, and further referring to FIG. 8, FIG. 9 and FIG. 10, FIG. 8 is a structural schematic diagram of the battery cell 30 provided by some embodiments of the present application, FIG. 9 is a sectional view of the battery cell 30 provided by some embodiments of the present application, and FIG. 10 is a partial enlarged view of B of the battery cell 30 shown in FIG. 9. The shell 31 has a wall portion 311, and the wall portion 311 is arranged to face the separator 20 in the first direction X, that is, the separator 20 and the shell 31 of the battery cell 30 are arranged in the first direction X, and the wall of the 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.

[0133] The shell 31 can also be used to contain an electrolyte, such as an electrolyte solution. The shell 31 can have various structural forms. The material of the shell 31 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0134] In some embodiments, referring to FIG. 5, FIG. 8 and FIG. 9, the shell 31 can include a housing 312 and an end cover 313, the housing 312 has an internal receiving cavity, and the receiving cavity has an opening 3121, that is, the housing 312 is a hollow structure with one end open, and the end cover 313 is sealed to the opening 3121 of the housing 312 to form a sealed space for containing the electrode assembly 32 and the electrolyte.

[0135] Optionally, the wall portion 311 provided with the mounting hole 3111 and the terminal assembly 33 mounted thereon can be the end cover 313 of the shell 31, or can be the bottom wall of the housing 312 of the shell 31. Exemplarily, in FIG. 8, the wall portion 311 is the end cover 313 of the shell 31, of course, in other embodiments, the wall portion 311 can also be the bottom wall of the housing 312 arranged opposite to the end cover 313 in the first direction X.

[0136] In assembling the battery cell 30, the electrode assembly 32 can be first placed in the housing 312, and the electrolyte is filled into the housing 312, and then the end cover 313 is sealed to the opening 3121 of the housing 312 to close the opening 3121 of the housing 312.

[0137] 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.

[0138] The wall portion 311 is provided with a mounting hole 3111, and the terminal assembly 33 is mounted to the wall portion 311 and covers the mounting hole 3111, and the terminal assembly 33 is electrically connected with the electrode assembly 32, that is, the terminal assembly 33 is a structure fixedly mounted to the wall portion 311, and the projection of the mounting hole 3111 in the first direction X is located in 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 the terminal assembly 33 can be electrically connected with the electrode assembly 32 accommodated in the inside of the shell 31 through the mounting hole 3111.

[0139] It should be noted that the terminal assembly 33 includes electrode terminals 331 for mutual electrical connection with the electrode assembly 32, and at least part of the projection of the electrode terminals 331 in the first direction X is located in the mounting hole 3111, so that the electrode terminals 331 can be electrically connected with 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 a direct connection structure or an indirect connection structure. For example, referring to FIGS. 9 and 10, the battery monomer 30 can further include a current collecting member 34, which is arranged in the shell 31, and the current collecting 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.

[0140] It should be noted that the connection structure between the current collecting member 34 and the electrode terminals 331 and between the current collecting member 34 and the tabs of the electrode assembly 32 can be various, such as welding connection or abutment.

[0141] The first space 111 is configured to collect the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33, that is, the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 can enter into the first space 111, so that the gas leaked from the inside of the battery monomer 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 monomer 30 through the terminal assembly 33 can be a structure directly entering into the first space 111, such as in FIG. 5, the spacer 20 is provided with a through hole 21 penetrating the spacer 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 monomer 30 is inserted into the through hole 21 along the first direction X, so that the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 can be directly into the first space 111, of course, in other embodiments, the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 can also be a structure indirectly entering into the first space 111, such as the terminal assembly 33 and the first space 111 are directly connected with a communication pipe, one end of the communication pipe communicates with the first space 111, and the terminal assembly 33 is inserted into the other end of the communication pipe, so that the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 can indirectly enter into the first space 111 through the communication pipe.

[0142] In FIG. 4, the spacer 20 is located above the battery monomer 30 in the first direction X, the spacer 20 is provided with a through hole 21 penetrating the spacer 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 leaked from the inside of the battery monomer 30 through the terminal assembly 33 can enter into the first space 111 through the through hole 21, to realize that the first space 111 can collect the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33.

[0143] It should be noted that in the use process of the battery monomer 30 inside the battery 100, the chemical reaction between the electrode assembly 32 and the electrolyte inside the battery 100 or the decomposition of the electrolyte can cause a large amount of flammable gas in the shell 31 of the battery monomer 30, such as the electrolyte includes water, and the water molecules can be decomposed into hydrogen and the like, correspondingly, the first space 111 is used to collect the flammable gas leaked from the inside of the battery monomer 30 through the terminal assembly 33.

[0144] In the embodiment, by arranging the partition 20 in the box 10 of the battery 100, the partition 20 can divide the assembly space 11 inside the box 10 into a first space 111 for collecting the gas leaked from the terminal assembly 33 inside the battery monomer 30 and a second space 112 for accommodating the shell 31 of the battery monomer 30, so that the gas leaked from the terminal assembly 33 of the battery monomer 30 during use of the battery monomer 30 can be accommodated in the first space 111, so that the leaked gas inside the battery monomer 30 can be separated from the second space 112 accommodating the shell 31 of the battery monomer 30, so as to alleviate the spread and diffusion of the flammable gas in the leaked gas inside the battery monomer 30 in the second space 112 of the box 10 accommodating the shell 31 of the battery monomer 30, so as to reduce the phenomenon of too high concentration of flammable gas in the second space 112, and further effectively reduce the risk of fire and explosion of the battery 100 caused by contact of the thermal runaway gas or sparks with the high-concentration flammable gas when the battery monomer 30 occurs thermal runaway, so as to reduce the safety hazard of the battery 100 during use, and help to improve the use reliability of the battery 100.

[0145] According to some embodiments of the present application, as shown in FIGS. 4, 5, 6, 9 and 10, the partition 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 partition 20 along the first direction X.

[0146] The through hole 21 penetrates the partition 20 along the first direction X, that is, the through hole 21 is a structure extending along the first direction X, and the two ends of the through hole 21 in the first direction X extend to the surfaces on both sides of the partition 20 in the first direction X, so that the through hole 21 can communicate the first space 111 and the second space 112.

[0147] The partition 20 and the wall portion 311 are arranged and arranged facing each other in the first direction X, that is, the partition 20 and the wall portion 311 are arranged and arranged facing each other in the first direction X.

[0148] In the embodiment, the partition 20 is provided with a through hole 21 penetrating the partition 20 along the first direction X and communicating the first space 111 and the second space 112, by arranging the wall portion 311 of the shell 31 of the battery monomer 30 to face the partition 20 in the first direction X and inserting the terminal assembly 33 of the battery monomer 30 into the through hole 21 along the first direction X, so that the gas leaked from the terminal assembly 33 of the battery monomer 30 can directly enter into the first space 111 through the through hole 21, thereby facilitating the reduction of the difficulty of the first space 111 collecting the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 and facilitating the improvement of the effect of the first space 111 collecting the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33.

[0149] According to some embodiments of the present application, referring to FIGS. 9 and 10, the terminal assembly 33 can include an electrode terminal 331, a connecting piece 332 and an insulating piece 333. The electrode terminal 331 is located outside the wall portion 311, 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 with the electrode assembly 32. The connecting piece 332 is connected to the wall portion 311, and the connecting piece 332 is configured to fasten the electrode terminal 331 to the wall portion 311. The insulating piece 333 is arranged between the electrode terminal 331 and the connecting piece 332, and the insulating piece 333 is configured to insulate and isolate the electrode terminal 331 and the connecting piece 332.

[0150] The electrode terminal 331 covers the mounting hole 3111 in the first direction X, and the electrode terminal 331 is connected with the tab of the electrode assembly 32 through the current collecting member 34.

[0151] The connecting piece 332 plays a role of assembling and fixing the electrode terminal 331 to the wall portion 311, the connecting piece 332 is an annular structure surrounding the outside of the electrode terminal 331, the connecting piece 332 is connected with the wall portion 311, and the connecting piece 332 is used to press the electrode terminal 331 to the wall portion 311 along the first direction X, so that the connecting piece 332 and the wall portion 311 can cooperate to clamp the electrode terminal 331, so as to fasten and assemble the electrode terminal 331 to the wall portion 311.

[0152] Exemplarily, the connecting piece 332 is welded with the wall portion 311.

[0153] The insulating piece 333 is arranged between the electrode terminal 331 and the connecting piece 332, and the insulating piece 333 is configured to insulate and isolate the electrode terminal 331 and the connecting piece 332, that is, at least part of the insulating piece 333 is located between the electrode terminal 331 and the connecting piece 332, so that the insulating piece 333 can insulate and isolate the electrode terminal 331 and the connecting piece 332, and the connecting piece 332 is a structure indirectly pressed to the electrode terminal 331 through the insulating piece 333.

[0154] Exemplarily, in FIG. 10, part of the connecting member 332 is embedded in the insulating member 333, i.e., the insulating member 333 covers the outside of part of the connecting member 332, thereby facilitating the assembly stability between the connecting member 332 and the insulating member 333.

[0155] Optionally, the material of the insulating member 333 can be various, such as rubber, silica gel or plastic, etc.

[0156] In the embodiment, the terminal assembly 33 is provided with the electrode terminal 331, the connecting member 332 and the insulating member 333, the electrode terminal 331 is electrically connected with the electrode assembly 32 to realize the input or output of the electric energy of the battery monomer 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 arranging 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, so as to reduce the risk of short circuit of the electrode terminal 331, thereby realizing the accommodation of the gas leaked 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 in the interior of the battery monomer 30 in the first space 111 through the structure that the terminal assembly 33 is arranged to be inserted into the through hole 21 along the first direction X.

[0157] According to some embodiments of the present application, as shown in FIG. 5, FIG. 9 and FIG. 10, the terminal assembly 33 and the shell 31 jointly form an accommodation space for accommodating the electrode assembly 32, the terminal assembly 33 has an exposed surface exposed to the outside of the battery monomer 30 and an inner side surface facing the accommodation space. The 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, the 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 side 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 on the first direction X is located in the through hole 21.

[0158] The accommodation space is a space formed by the terminal assembly 33 and the housing 31, the wall portion 311 of the housing 31 is provided with a mounting hole 3111, and the terminal assembly 33 covers the mounting hole 3111. Correspondingly, the accommodation space includes the internal space of the housing 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 the embodiment in which the battery monomer 30 also includes the first sealing member 36, the first sealing member 36 is arranged between the wall portion 311 and the electrode terminal 331, and part of the first sealing member 36 extends into the mounting 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 accommodation space formed by the terminal assembly 33 and the housing 31.

[0159] The exposed surface of the terminal assembly 33 is the outer surface of the terminal assembly 33 exposed to the outside, and conversely, the inner surface of the terminal assembly 33 is the inner surface of the terminal assembly 33 facing the accommodation space.

[0160] It should be noted that the first contact interface 334 is the surface in contact between the insulating member 333 and the electrode terminal 331, and the second contact interface 335 is the surface in contact between the insulating member 333 and the connecting member 332. Correspondingly, the first space 111 is configured to collect the gas leaked from the inside of the battery monomer 30 through the first contact interface 334 and the second contact interface 335, that is, the gas in the inside of the battery monomer 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.

[0161] The first terminal end 3342 of the first contact interface 334 is an end of the first contact interface 334 exposed to the outside, and conversely, the first starting end 3341 of the first contact interface 334 is an end of the first contact interface 334 located on the inner surface of the accommodation space. Similarly, the second terminal end 3352 of the second contact interface 335 is an end of the second contact interface 335 exposed to the outside, and conversely, the second starting end 3351 of the second contact interface 335 is an end of the second contact interface 335 located on the inner surface of the accommodation space.

[0162] The first terminal end 3342 is located in the through hole 21 or the first space 111, that is, the first terminal 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.

[0163] The projection of the second terminal end 3352 in the first direction X is located in the through hole 21, that is, in the same plane perpendicular to the first direction X, the orthographic projection of the second terminal end 3352 is located on the inside of the orthographic projection of the hole wall surface of the through hole 21.

[0164] In the present embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and gas inside the battery cell 30 is prone to leak from the first contact interface 334. By arranging the first termination end 3342 of the first contact interface 334, which is located on the exposed surface of the terminal assembly 33, to be located within the through hole 21 or the first space 111, the gas leaked from the first contact interface 334 is facilitated to enter the first space 111, thereby facilitating further improvement of the effect of the first space 111 in collecting the gas inside the battery cell 30 that leaks through the terminal assembly 33, so as to further alleviate the phenomenon of the flammable gas in the leaked gas inside the battery cell 30 spreading and diffusing within 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 gas inside the battery cell 30 is prone to leak from the second contact interface 335. By arranging the second termination end 3352 of the second contact interface 335, which is located on the exposed surface of the terminal assembly 33, to be located within the through hole 21 in the projection in the first direction X, the gas leaked from the second contact interface 335 is facilitated to enter the first space 111, thereby facilitating further improvement of the effect of the first space 111 in collecting the gas inside the battery cell 30 that leaks through the terminal assembly 33, so as to further alleviate the phenomenon of the flammable gas in the leaked gas inside the battery cell 30 spreading and diffusing within the second space 112 of the box body 10.

[0165] According to some embodiments of the present application, please continue to combine FIG. 5, FIG. 9 and FIG. 10, the terminal assembly 33 and the shell 31 jointly form a containing space for containing 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 gas leaked from the containing 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 containing space in the leakage direction of the gas, and the second contact interface 335 has a second termination end 3352 away from the containing space in the leakage direction of the gas. The first termination end 3342 is located within the through hole 21 or the first space; and / or, the projection of the second termination end 3352 in the first direction X is located within the through hole 21.

[0166] Among them, the first contact interface 334 has a first termination end 3342 away from the containing space in the leakage direction of the gas, that is, the first termination end 3342 is the end of the first contact interface 334 in contact with the outside of the battery cell 30.

[0167] The second contact interface 335 has a second terminal end 3352 away from the accommodation space in the gas leakage direction, that is, the second terminal end 3352 is the end of the second contact interface 335 in contact with the outside of the battery monomer 30.

[0168] In the embodiment, the first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and the gas inside the battery monomer 30 is prone to leak from the first contact interface 334. By arranging the first terminal 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, the gas leaked from the first contact interface 334 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery monomer 30 through the terminal assembly 33, and further relieving the phenomenon that the flammable gas in the gas leaked from the battery monomer 30 spreads and diffuses in the second space 112 of the box body 10. Similarly, the second contact interface 335 is formed between the insulating member 333 and the connecting member 332, and the gas inside the battery monomer 30 is prone to leak from the second contact interface 335. By arranging the second terminal end 3352 of the second contact interface 335 away from the accommodation space in the gas leakage direction to be located in the first space 111 in the projection in the first direction X, the gas leaked from the second contact interface 335 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery monomer 30 through the terminal assembly 33, and further relieving the phenomenon that the flammable gas in the gas leaked from the battery monomer 30 spreads and diffuses in the second space 112 of the box body 10.

[0169] According to some embodiments of the present application, referring to FIG. 11, which is a partial sectional view of the battery monomer 30 provided by some other embodiments of the present application. The terminal assembly 33 can include the electrode terminal 331 and the insulating member 333. Part of the electrode terminal 331 is arranged in the mounting hole 3111, and the electrode terminal 331 is electrically connected with the electrode assembly 32. The insulating member 333 is located on the side of the wall portion 311 away from the electrode assembly 32 in the first direction X, and at least part of the insulating member 333 is arranged between the electrode terminal 331 and the wall portion 311. The insulating member 333 is configured to insulate and isolate the electrode terminal 331 and the wall portion 311.

[0170] Part of the electrode terminal 331 is arranged in the mounting hole 3111, that is, the electrode terminal 331 is in a structure of being inserted into the mounting hole 3111 of the wall portion 311, so that the electrode terminal 331 can be electrically connected with the electrode assembly 32 accommodated in the shell 31.

[0171] The electrode terminal 331 has a first clamping portion 3311 located on the side of the wall portion 311 away from the electrode assembly 32 and a second clamping portion 3312 located on the side of the wall portion 311 facing the electrode assembly 32, and the first clamping portion 3311 and the second clamping portion 3312 are configured to cooperatively clamp the wall portion 311, that is, a portion of the electrode terminal 331 is located on the side of the wall portion 311 away from the electrode assembly 32 in the first direction X, and correspondingly, the portion is the first clamping portion 3311 of the electrode terminal 331, and a portion 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, and correspondingly, the portion is the second clamping portion 3312 of the electrode terminal 331, so that a portion 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, and the electrode terminal 331 can be fastened to the wall portion 311 by the cooperative clamping of the wall portion 311 by the first clamping portion 3311 and the second clamping portion 3312. For example, 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 located on the two sides of the wall portion 311, respectively.

[0172] It should be noted that the first clamping portion 3311 and the second clamping portion 3312 can be a structure directly clamping the wall portion 311, that is, the first clamping portion 3311 and the second clamping portion 3312 directly abut the wall portion 311, of course, the first clamping portion 3311 and the second clamping portion 3312 can also be a structure indirectly clamping the wall portion 311, that is, the first clamping portion 3311 and the second clamping portion 3312 can be a structure indirectly abutting the wall portion 311 through other components.

[0173] For example, in FIG. 11, at least a portion of the insulating piece 333 is arranged between the first clamping portion 3311 and the wall portion 311, and the insulating piece 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 piece 333, so that the insulating isolation between the wall portion 311 and the first clamping portion 3311 can be achieved through the insulating piece 333.

[0174] Optionally, the material of the insulating piece 333 can be various, for example, the material of the insulating piece 333 can be rubber, silicone or plastic, etc.

[0175] In the embodiment, the terminal assembly 33 is provided with the electrode terminal 331 and the insulating member 333, the electrode terminal 331 is electrically connected with the electrode assembly 32 to realize the input or output of the electric energy of the battery monomer 30, the insulating member 333 is arranged between the electrode terminal 331 and the wall portion 311, so that the insulating member 333 can insulate and isolate the wall portion 311 and the electrode terminal 331, to reduce the risk of short circuit of the electrode terminal 331, so that the gas leaked 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 monomer 30 can be accommodated in the first space 111 by arranging the terminal assembly 33 in the structure of being inserted into the through hole 21 along the first direction X.

[0176] According to some embodiments of the present application, as shown in FIG. 5 and FIG. 11, the terminal assembly 33 and the shell 31 jointly form an accommodation space for accommodating the electrode assembly 32, and the terminal assembly 33 has an exposed surface exposed to the outside of the battery monomer 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, the first ending end 3342 and the second ending end 3352 are both located on the exposed surface, the first starting end 3341 is closer to the accommodation space than the first ending end 3342, and the second starting end 3351 is closer to the accommodation 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 on the first direction X is located in the through hole 21.

[0177] The accommodation space is the space jointly formed by the terminal assembly 33 and the shell 31, the wall portion 311 of the shell 31 is provided with a mounting hole 3111, and the terminal assembly 33 covers the mounting hole 3111. Correspondingly, the accommodation space includes the internal space of the 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 the embodiment in which the battery monomer 30 also includes the first sealing member 36, the first sealing member 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 part of the first sealing member 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 sealing member 36 is also located in the accommodation space jointly formed by the terminal assembly 33 and the shell 31.

[0178] It should be noted that the first contact interface 334 is a surface in contact with each other between the insulating member 333 and the first clamping portion 3311 of the electrode terminal 331, and the second contact interface 335 is a surface in contact with each other between the insulating member 333 and the wall portion 311. 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, the gas in the inside of the battery cell 30 is mainly leaked 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 collected into the first space 111.

[0179] 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 terminal end 3342 and the second terminal end 3352 are both located on the exposed surface, that is, the first terminal end 3342 of the first contact interface 334 is one end of the first contact interface 334 exposed to the outside, and the second terminal end 3352 of the second contact interface 335 is one end of the second contact interface 335 exposed to the outside.

[0180] The first starting end 3341 is closer to the accommodation space than the first terminal end 3342, that is, when the gas in the inside of 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 terminal end 3342. Similarly, the second starting end is closer to the accommodation space than the second terminal end, that is, when the gas in the inside of 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 terminal end 3352.

[0181] In the present embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and gas inside the battery cell 30 is prone to leak from the first contact interface 334. By arranging the first terminal end 3342 of the first contact interface 334, which is located on the exposed surface of the terminal assembly 33, to be located within the through hole 21 or the first space 111, the gas leaked from the first contact interface 334 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon of the flammable gas among the leaked gas inside the battery cell 30 spreading and diffusing 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 gas inside the battery cell 30 is prone to leak from the second contact interface 335. By arranging the second terminal end 3352 of the second contact interface 335, which is located on the exposed surface of the terminal assembly 33, to have a projection in the first direction X located within the through hole 21, the gas leaked from the second contact interface 335 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon of the flammable gas among the leaked gas inside the battery cell 30 spreading and diffusing in the second space 112 of the box body 10.

[0182] According to some embodiments of the present application, please continue to combine FIG. 5 and FIG. 11, the terminal assembly 33 and the shell 31 jointly form a containing space for containing 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 gas leaked from the containing 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 containing space in the leakage direction of the gas, and the second contact interface 335 has a second terminal end 3352 away from the containing space in the leakage direction of the gas. The first terminal end 3342 is located within the through hole 21 or the first space 111; and / or, the projection of the second terminal end 3352 in the first direction X is located within the through hole 21.

[0183] Among them, the first contact interface 334 has a first terminal end 3342 away from the containing space in the leakage direction of the gas, that is, the first terminal end 3342 is the end of the first contact interface 334 in contact with the outside of the battery cell 30.

[0184] The second contact interface 335 has a second terminal end 3352 away from the containing space in the leakage direction of the gas, that is, the second terminal end 3352 is the end of the second contact interface 335 in contact with the outside of the battery cell 30.

[0185] In the present embodiment, a first contact interface 334 is formed between the insulating member 333 and the electrode terminal 331, and gas inside the battery cell 30 is prone to leak from the first contact interface 334. By arranging the first contact interface 334 away from the first termination end 3342 of the accommodation space in the direction of gas leakage to be located within the through hole 21 or the first space 111, the gas leaked from the first contact interface 334 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon of the flammable gas in the gas leaked from the battery cell 30 spreading and diffusing within 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 gas inside the battery cell 30 is prone to leak from the second contact interface 335. By arranging the second contact interface 335 away from the second termination end 3352 of the accommodation space in the direction of gas leakage to be located within the first space 111 in the projection in the first direction X, the gas leaked from the second contact interface 335 is facilitated to enter the first space 111, thereby further improving the effect of the first space 111 collecting the gas leaked from the battery cell 30 through the terminal assembly 33, and further alleviating the phenomenon of the flammable gas in the gas leaked from the battery cell 30 spreading and diffusing within the second space 112 of the box body 10.

[0186] In some embodiments, referring to FIGS. 10 and 11, the terminal assembly 33 and the housing 31 jointly form an accommodation space for accommodating the electrode assembly 32, the terminal assembly 33 includes the electrode terminal 331, at least part of the projection of the electrode terminal 331 in the first direction X is located within the mounting hole 3111, and the electrode terminal 331 is electrically connected with the electrode assembly 32. The battery cell 30 further includes a first sealing member 36, the first sealing member 36 is located within the accommodation space, and the first sealing member 36 is arranged between the electrode terminal 331 and the wall portion 311, and the first sealing member 36 is configured to seal the gap between the electrode terminal 331 and the wall portion 311.

[0187] In some embodiments, referring to FIGS. 10 and 11, the terminal assembly 33 and the housing 31 jointly form an accommodation space for accommodating the electrode assembly 32, the terminal assembly 33 includes the electrode terminal 331, at least part of the projection of the electrode terminal 331 in the first direction X is located within the mounting hole 3111, and the electrode terminal 331 is electrically connected with the electrode assembly 32. The battery cell 30 further includes a first sealing member 36, the first sealing member 36 is located within the accommodation space, and the first sealing member 36 is arranged between the electrode terminal 331 and the wall portion 311, and the first sealing member 36 is configured to seal the gap between the electrode terminal 331 and the wall portion 311.

[0188] In FIG. 10, part of the first sealing member 36 is located between the electrode terminal 331 and the wall portion 311 in the first direction X, and part of the first sealing member 36 extends into the mounting hole 3111. Correspondingly, the space where the first sealing member 36 is located is also the accommodation space jointly formed by the terminal assembly 33 and the housing 31.

[0189] In FIG. 11, part of the first sealing member 36 is located in the mounting hole 3111, part of the first sealing member 36 is located between the wall portion 311 and the first clamping portion 3311 of the electrode terminal 331, and part of the first sealing member 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 sealing member 36 is located is also the accommodating space formed by the terminal assembly 33 and the shell 31 together.

[0190] In the present embodiment, the battery monomer 30 is also provided with the first sealing member 36. By arranging the first sealing member 36 in the accommodating space formed by the terminal assembly 33 and the shell 31 together, and arranging the first sealing member 36 between the electrode terminal 331 of the terminal assembly 33 and the wall portion 311 of the shell 31, the first sealing member 36 can also seal the gap between the electrode terminal 331 and the wall portion 311, so that the first sealing member 36 can play a certain blocking effect on the gas inside the shell 31, thereby alleviating the phenomenon that the gas inside the shell 31 overflows through the mounting hole 3111, and further reducing the risk of gas leakage in the accommodating space through the terminal assembly 33.

[0191] According to some embodiments of the present application, referring to FIGS. 4 and 5, along the first direction X, the projection of the terminal assembly 33 is located in the through hole 21. That is, in the plane perpendicular to the first direction X, the orthographic projection of the terminal assembly 33 is located in the area defined by the orthographic projection of the hole wall surface of the through hole 21.

[0192] In the present embodiment, by arranging the projection of the terminal assembly 33 in the first direction X in the through hole 21, on the one hand, it is convenient to insert the terminal assembly 33 into the through hole 21 along the first direction X, and on the other hand, the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 is more likely to enter the first space 111 through the through hole 21, thereby facilitating to further reduce the difficulty of the first space 111 collecting the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33, and facilitating to further improve the effect of the first space 111 collecting the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33, so as to further alleviate the risk that the flammable gas in the gas leaked from the inside of the battery monomer 30 spreads and diffuses in the second space 112 of the box body 10.

[0193] According to some embodiments of the present application, referring to FIG. 5, along the first direction X, the wall portion 311 abuts against the isolation member 20.

[0194] It should be noted that the structure in which the wall portion 311 and the isolation member 20 abut against each other in the first direction X can be that the wall portion 311 and the isolation member 20 directly abut against each other in the first direction X, or the structure in which the wall portion 311 and the isolation member 20 indirectly abut against each other in the first direction X through other components.

[0195] In the embodiment, by setting the wall portion 311 and the partition 20 in the structure of abutting each other in the first direction X, the tightness of the mutual assembly of the wall portion 311 of the shell 31 and the partition 20 in the first direction X can be improved, the size of the gap between the wall portion 311 of the shell 31 and the partition 20 can be reduced, and the phenomenon that the gas leaked from the battery monomer 30 through the terminal assembly 33 spreads into the second space 112 from the gap between the wall portion 311 of the shell 31 and the partition 20 can be effectively alleviated, so that when the battery monomer 30 occurs thermal runaway, the risk of fire and explosion of the battery 100 caused by the contact of the thermal runaway gas or sparks with the high-concentration flammable gas can be effectively reduced, and the use reliability of the battery 100 can be improved.

[0196] In some embodiments, please continue to refer to FIG. 5, along the first direction X, the second seal 40 is arranged between the wall portion 311 and the partition 20, the wall portion 311 abuts against the partition 20 through the second seal 40, the second seal 40 is arranged around the terminal assembly 33, and the second seal 40 is configured to seal the gap between the wall portion 311 and the partition 20.

[0197] Among them, the second seal 40 is arranged between the wall portion 311 and the partition 20 in the first direction X, so that the wall portion 311 and the partition 20 are indirectly abutted through the second seal 40.

[0198] The second seal 40 is arranged around the terminal assembly 33, and the second seal 40 is configured to seal the gap between the wall portion 311 and the partition 20, that is, the second seal 40 is arranged around the outer circumferential side of the terminal assembly 33, and the second seal 40 can seal the gap between the wall portion 311 and the partition 20 in the first direction X.

[0199] Exemplarily, the material of the second seal 40 can be various, for example, the material of the second seal 40 can be plastic, silicone or rubber, etc.

[0200] In the embodiment, the wall portion 311 of the shell 31 is in abutment with the partition 20 in the first direction X through the second seal 40, and the second seal 40 is arranged around the outer periphery of the terminal assembly 33, so that the gap between the wall portion 311 of the shell 31 and the partition 20 can be sealed by the second seal 40, thereby further improving the tightness of the wall portion 311 of the shell 31 and the partition 20 in the first direction X, and further reducing the phenomenon that the gas leaked from the battery monomer 30 through the terminal assembly 33 spreads into the second space 112 from the gap between the wall portion 311 of the shell 31 and the partition 20, so that the risk of fire and explosion of the battery 100 caused by the contact between the thermal runaway gas or sparks and the high-concentration flammable gas can be further reduced when the battery monomer 30 is in thermal runaway, thereby further improving the use reliability of the battery 100.

[0201] According to some embodiments of the present application, as shown in FIGS. 2, 3, 4 and 7, the box body 10 can include a first box body 12 and a second box body 13 arranged in the first direction X, and the first box body 12 and the second box body 13 are overlapped with each other and jointly define the assembly space 11. The partition 20 is connected to the inner surface of the first box body 12 facing the battery monomer 30 in the first direction X, and the partition 20 and the first box body 12 jointly define the first space 111.

[0202] In the embodiment, the partition 20 is connected to the inner surface of the first box body 12 facing the battery monomer 30 in the first direction X, that is, the partition 20 is connected to the inner surface of the first box body 12 facing the assembly space 11, and the partition 20 and the inner surface of the first box body 12 jointly define the first space 111.

[0203] Exemplarily, the connection structure between the partition 20 and the first box body 12 can be various, such as welding connection or bonding, etc.

[0204] In the embodiment, the box body 10 is provided with the first box body 12 and the second box body 13 arranged in the first direction X, and the first box body 12 and the second box body 13 are overlapped with each other and jointly define the assembly space 11. The partition 20 is arranged on the inner surface of the first box body 12 facing the battery monomer 30 in the first direction X, so that the partition 20 and the first box body 12 can jointly define the first space 111. The battery 100 adopting such structure can reduce the assembly difficulty of the partition 20, and can reduce the difficulty of subsequent maintenance and replacement of the partition 20 of the battery 100, thereby reducing the manufacturing cost and the later maintenance cost of the battery 100.

[0205] In some embodiments, referring to FIG. 3 and FIG. 4, the second box body 13 has a bottom plate 131 which is spaced apart from the partition 20 along the first direction X. Along the first direction X, the outer shell 31 is arranged between the partition 20 and the bottom plate 131, and the bottom plate 131 is configured to support the battery cell 30.

[0206] The bottom plate 131 is one wall of the second box body 13 which is opposite and spaced apart from the first box body 12 along the first direction X, so that the bottom plate 131 can be arranged in the first direction X spaced apart from the partition 20 which is connected to the inner surface of the first box body 12.

[0207] Along the first direction X, the outer shell 31 is arranged between the partition 20 and the bottom plate 131, that is, the partition 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 along the first direction X.

[0208] 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 direction of gravity or approximately the direction of gravity, 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 along the first direction X.

[0209] In the present embodiment, the bottom plate 131 of the second box body 13 and the partition 20 are structures arranged spaced apart along the first direction X. By arranging the outer shell 31 of the battery cell 30 between the partition 20 and the bottom plate 131 along the first direction X, and the bottom plate 131 can support the battery cell 30 along the first direction X, so that the partition 20 is a structure located above the battery cell 30 along the first direction X, so that the first space 111 defined by the partition 20 and the first box body 12 is located above the battery cell 30 along the first direction X, thereby facilitating the gas leaked from the terminal assembly 33 of the battery cell 30 to directly enter the first space 111 through the through hole 21, which is conducive to further reducing the difficulty of the first space 111 collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33, and is conducive to further improving the effect of the first space 111 collecting the gas leaked from the inside of the battery cell 30 through the terminal assembly 33.

[0210] According to some embodiments of the present application, referring to FIG. 4, the box body 10 is provided with a first exhaust hole 14 which communicates with the first space 111.

[0211] The first exhaust hole 14 penetrates 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.

[0212] It should be noted that in the embodiment in which the box 10 includes the first box body 12 and the second box body 13, and the partition 20 is connected to the inner surface of the first box body 12 facing the battery monomer 30 and forms the first space 111, the first exhaust hole 14 is arranged on the first box body 12.

[0213] In the embodiment, by arranging the first exhaust hole 14 on the box 10 which communicates with the first space 111, the first space 111 can communicate with the outside of the box 10 through the first exhaust hole 14, so that the gas collected in the first space 111 can be discharged from the box 10, so that the combustible gas in the gas leaked from the inside of the battery monomer 30 can be discharged from the box 10 in time, and the phenomenon that the combustible gas leaked from the inside of the battery monomer 30 is accumulated in the first space 111 of the box 10 can be effectively alleviated, on the one hand, the risk of fire and explosion of the battery 100 caused by the contact between the thermal runaway gas or sparks and the high-concentration combustible gas after the thermal runaway of the battery monomer 30 can be further reduced, and on the other hand, the phenomenon that the gas in the first space 111 cannot further collect the gas leaked from the inside of the battery monomer 30 through the terminal assembly 33 after the gas in the first space 111 is accumulated too much can be alleviated.

[0214] In some embodiments, referring to FIGS. 2, 3 and 4, the battery 100 can further include a first valve 50, the first valve 50 is arranged at the first exhaust hole 14, and the first valve 50 is configured to allow the gas in the first space 111 to be discharged from the box 10 and to prevent liquid from entering the first space 111.

[0215] The first valve 50 is connected to the box 10 and located at the first exhaust hole 14, the first valve 50 allows the gas in the first space 111 to be discharged from the box 10 and prevents 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 and breathable valve or a one-way breathable valve.

[0216] In the embodiment, by arranging the first valve 50 at the first exhaust hole 14 of the box 10, and the first valve 50 is configured to allow the gas in the first space 111 to be discharged from the box 10 and to prevent liquid from entering the first space 111, so that the gas in the first space 111 can be discharged from the first space 111 through the first valve 50, while the phenomenon that liquid enters the first space 111 of the box 10 can be alleviated, which is beneficial to reduce the risk that the liquid entering the box 10 causes internal short circuit or damage of the battery 100, and thus the use reliability and service life of the battery 100 can be improved.

[0217] According to some embodiments of the present application, referring to FIG. 3, FIG. 4 and FIG. 8, the battery cell 30 can further comprise a pressure relief component 35 disposed on the housing 31, the pressure relief component 35 configured to relieve internal pressure of the battery cell 30, the pressure relief component 35 located within the second space 112.

[0218] 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 can be disposed on the wall portion 311 of the housing 31, i.e. the pressure relief component 35 and the terminal assembly 33 are both disposed on the same end of the housing 31 in the first direction X. Of course, the pressure relief component 35 can also be disposed on other walls of the housing 31.

[0219] Exemplarily, in FIG. 8, the pressure relief component 35 is disposed on the wall portion 311 of the housing 31. Similarly, the pressure relief component 35 and the housing 31 can be an integrally formed structure or a separately disposed structure. Exemplarily, in FIG. 8, the pressure relief component 35 and the housing 31 are a separately disposed structure, i.e. the pressure relief component 35 and the housing 31 are a split structure, the pressure relief component 35 can be connected to the housing 31 by welding or the like, and correspondingly, the pressure relief component 35 can be a component 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 an integrally formed structure, i.e. the pressure relief component 35 and the housing 31 are an integral structure, the pressure relief component 35 can be a region of the housing 31 having a weak structure, for example, the pressure relief component 35 can be a region of the wall of the housing 31 provided with a notched groove.

[0220] The pressure relief component 35 is located within the second space 112, that is, when the battery cell 30 experiences thermal runaway, the thermal runaway gas inside the battery cell 30 relieved by the pressure relief component 35 can enter the second space 112.

[0221] In the embodiment, the pressure relief component 35 is arranged on the shell 31 of the battery cell 30, so that the battery cell 30 can release the internal pressure of the battery cell 30 through the pressure relief component 35 when thermal runaway occurs, to reduce the risk of explosion of the battery cell 30. By arranging the pressure relief component 35 of the battery cell 30 in the structure located in the second space 112, the thermal runaway gas released by the battery cell 30 through the pressure relief component 35 can enter the second space 112, so that the flammable gas in the gas leaked by the battery cell 30 through the terminal assembly 33 in the first space 111 can be separated from the thermal runaway gas released by the pressure relief component 35 of the battery cell 30, thereby effectively reducing the risk of fire and explosion of the battery 100 caused by the contact between the thermal runaway gas and the flammable gas when the battery cell 30 occurs thermal runaway, to reduce the safety hazard of the battery 100 in use, thereby further improving the use reliability of the battery 100.

[0222] According to some embodiments of the application, referring to FIG. 8, the isolating piece 20 and the wall portion 311 face each other in the first direction X, and the pressure relief component 35 is arranged on the wall portion 311. That is, the pressure relief component 35 and the terminal assembly 33 are arranged on one end of the shell 31 facing the isolating piece 20 in the first direction X.

[0223] In the embodiment, the pressure relief component 35 of the battery cell 30 and the terminal assembly 33 of the battery cell 30 are arranged on the wall portion 311 of the shell 31, so that the pressure relief component 35 and the terminal assembly 33 are arranged on the same end of the shell 31 in the first direction X, so that the pressure relief component 35 and the terminal assembly 33 can share part of the space in the first direction X, which is beneficial to optimize the space structure of the battery cell 30, to save the space occupied by the battery cell 30 in the first direction X, and to facilitate the assembly of the battery cell 30 into the box 10.

[0224] According to some embodiments of the application, as shown in FIGS. 6, 7 and 8, along the first direction X, the isolating piece 20 forms an avoiding space 22 corresponding to the region of the pressure relief component 35, the avoiding space 22 is in communication with the second space 112, and the avoiding space 22 is not in communication with the first space 111.

[0225] In FIG. 6, the avoiding space 22 is a notch arranged on the isolating piece 20, and the notch penetrates the isolating piece 20 in the first direction X. Of course, in other embodiments, the avoiding space 22 can also be a groove arranged on the side of the isolating piece 20 facing the pressure relief component 35 in the first direction X.

[0226] In the embodiment, by arranging the avoiding space 22 which is in communication with the second space 112 and not in communication with the first space 111 at the position of the pressure relief component 35 corresponding to the isolating piece 20 along the first direction X, the isolating piece 20 can be reduced to shield and block the pressure relief component 35 when the pressure relief component 35 releases the internal pressure of the battery monomer 30, which is conducive to improving the smoothness of the pressure relief component 35 releasing the internal pressure of the battery monomer 30, and the thermal runaway gas released by the pressure relief component 35 can enter the second space 112 through the avoiding space 22, which is conducive to alleviating the phenomenon that the thermal runaway gas released by the pressure relief component 35 enters the first space 111.

[0227] In some embodiments, the projection of the pressure relief component 35 is located in the avoiding space 22 along the first direction X.

[0228] In the embodiment, by arranging the projection of the pressure relief component 35 in the avoiding space 22 along the first direction X, the whole pressure relief component 35 can be arranged corresponding to the avoiding space 22 along the first direction X, so that the isolating piece 20 can be further reduced to shield and block the pressure relief component 35 when the pressure relief component 35 releases the internal pressure of the battery monomer 30, which is conducive to further improving the smoothness of the pressure relief component 35 releasing the internal pressure of the battery monomer 30.

[0229] It should be noted that the structure of the battery monomer 30 is not limited to this, and in some embodiments, the battery monomer 30 can also have other structures, for example, the isolating piece 20 and the wall portion 311 are arranged to face each other along the first direction X, and the pressure relief component 35 is arranged at one end of the shell 31 away from the wall portion 311 along the first direction X. That is, after the battery monomer 30 is assembled into the box body 10, the terminal assembly 33 of the battery monomer 30 is arranged at one end of the shell 31 facing the isolating piece 20 along the first direction X, and the pressure relief component 35 of the battery monomer 30 is arranged at one end of the shell 31 away from the isolating piece 20 along the first direction X, so that the terminal assembly 33 and the pressure relief component 35 are respectively located at two ends of the shell 31 of the battery monomer 30 along the first direction X. In this embodiment, the exhaust passage, the exhaust groove or the exhaust cavity can be arranged on the wall of the box body 10 opposite to the pressure relief component 35, and the exhaust passage, the exhaust groove or the exhaust cavity are in communication with the second space 112.

[0230] In the embodiment, by arranging the pressure relief component 35 at one end of the shell 31 away from the wall portion 311 along the first direction X, the pressure relief component 35 of the battery monomer 30 and the terminal assembly 33 of the battery monomer 30 are respectively located at two ends of the shell 31 along the first direction X, which can reduce the interference between the terminal assembly 33 and the pressure relief component 35, and further reduce the risk that the flammable gas in the gas leaked from the terminal assembly 33 of the battery monomer 30 and the thermal runaway gas released by the pressure relief component 35 contact each other.

[0231] According to some embodiments of the present application, referring to FIG. 4 and FIG. 7, the box 10 is provided with a second exhaust hole 15, and the second exhaust hole 15 is in communication with the second space 112.

[0232] The second exhaust hole 15 penetrates the inner surface and the outer surface of the box 10, so that the second exhaust hole 15 can communicate the second space 112 and the outside of the box 10.

[0233] It should be noted that in the embodiment in which the box 10 includes the first box body 12 and the second box body 13, and the isolation piece 20 is connected to the inner surface of the first box body 12 facing the battery monomer 30 and forms the first space 111, the second exhaust hole 15 can be provided on the first box body 12 or the second box body 13. Exemplarily, in FIG. 4 and FIG. 7, the second exhaust hole 15 is provided on the first box body 12.

[0234] In the present embodiment, by providing the second exhaust hole 15 on the box 10 which is in communication with the second space 112, the second space 112 can be in communication with the outside of the box 10 through the second exhaust hole 15, so that the thermal runaway gas released by the pressure relief component 35 of the battery monomer 30 can be discharged from the box 10, so as to realize that the thermal runaway gas released by the pressure relief component 35 of the battery monomer 30 can be discharged from the box 10 in time, and thus the phenomenon that the thermal runaway gas released by the pressure relief component 35 of the battery monomer 30 accumulates in the second space 112 of the box 10 can be effectively alleviated, which is beneficial to further reduce the risk that the combustible gas in the thermal runaway gas released by the pressure relief component 35 of the battery monomer 30 contacts the gas leaked from the terminal assembly 33 inside the battery monomer 30 to cause the battery 100 to catch fire and explode.

[0235] In some embodiments, referring to FIG. 3 and FIG. 4, the battery 100 can further include a second valve 60, and the second valve 60 is provided on the second exhaust hole 15 and is configured to release the internal pressure of the second space 112.

[0236] The second valve 60 is connected to the box 10 and located at the second exhaust hole 15, and the second valve 60 functions to release the pressure inside the box 10 when the internal pressure or temperature of the second space 112 of the box 10 reaches a predetermined value.

[0237] 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, or a safety valve, etc.

[0238] In the embodiment, the battery 100 is further provided with the second valve 60, and the second valve 60 is arranged at the second exhaust hole 15 of the box body 10, so that the second valve 60 can release 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 burst of the battery 100 during use.

[0239] According to some embodiments of the present application, the present application also provides a power-using device, which comprises the battery 100 of any one of the above solutions, and the battery 100 is used to provide electric energy for the power-using device.

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

[0241] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict.

[0242] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery, comprising: a case in which an assembly space is formed inside; a partition provided in the assembly space and connected to the case, the partition being configured to divide the assembly space into a first space and a second space, the partition being provided with a through hole communicating the first space and the second space, the through hole penetrating the partition in a first direction; and a battery cell including a case, an electrode assembly, and a terminal assembly, the case being accommodated in the second space, the case having a wall portion provided with a mounting hole, the electrode assembly being provided in the case, the terminal assembly being mounted to the wall portion and covering the mounting hole, the terminal assembly being electrically connected to the electrode assembly; wherein, in the first direction, the partition is provided outside the wall portion, and the terminal assembly is inserted into the through hole. The terminal assembly includes:

2. The battery of claim 1, wherein, an electrode terminal located outside the wall portion, at least a part of a projection of the electrode terminal in the first direction being located in the mounting hole, the electrode terminal being electrically connected to the electrode assembly; a connecting member connected to the wall portion, the connecting member being configured to fasten the electrode terminal to the wall portion; an insulating member provided between the electrode terminal and the connecting member, the insulating member being configured to insulate the electrode terminal and the connecting member. The terminal assembly and the case collectively form an accommodation space for accommodating the electrode assembly, the terminal assembly having an exposed surface exposed outside the battery cell and an inner surface facing the accommodation space; 3. The battery of claim 2, wherein, 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 ending 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 ending end, the first starting end and the second starting end are both located on the inner surface, 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 a projection of the second ending end in the first direction is located in the through hole. The terminal assembly and the case collectively form an accommodation space for accommodating the electrode assembly, a first contact interface is formed between the insulating member and the electrode terminal, a second contact interface is formed between the insulating member and the connecting member; 4. The battery of claim 2, wherein, 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 ending end away from the accommodation space in a leakage direction of the gas, the second contact interface has a second ending end away from the accommodation space in the leakage direction of the gas; wherein the first ending end is located in the through hole or the first space; and / or a projection of the second ending end in the first direction is located in the through hole. The terminal assembly includes:

5. The battery of claim 1, wherein, an electrode terminal partially penetrating 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 in the first direction, and is arranged between the electrode terminal and the wall portion, and the insulating member is configured to insulate and separate the electrode terminal and the wall portion.

6. The battery of claim 5, wherein, The terminal assembly and the shell jointly form an accommodation space for accommodating the electrode assembly, and the terminal assembly has an exposed surface exposed to the outside of the battery monomer; A first contact interface is formed between the insulating member and the electrode terminal, and 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, and the second contact interface has a second starting end and a second ending end; the first ending end and the second ending end are both located on the exposed surface; the first starting end is closer to the accommodation space than the first ending end; and the second starting end is closer to the accommodation space than the second ending end; The first ending end is located in the through hole or the first space; and / or A projection of the second ending end in the first direction is located in the through hole.

7. The battery of claim 5, wherein, The terminal assembly and the shell jointly form an accommodation space for accommodating the electrode assembly, and 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 ending end away from the accommodation space in the direction of gas leakage, and the second contact interface has a second ending end away from the accommodation space in the direction of gas leakage; The first ending end is located in the through hole or the first space; and / or A projection of the second ending end in the first direction is located in the through hole.

8. The battery of any one of claims 1-7, wherein, The terminal assembly and the shell jointly form an accommodation space for accommodating the electrode assembly, and the terminal assembly includes an electrode terminal, a projection of the electrode terminal in the first direction is located in the mounting hole, and the electrode terminal is electrically connected with the electrode assembly; The battery monomer further includes a first sealing member, the first sealing member is located in the accommodation space, and the first sealing member is arranged between the electrode terminal and the wall portion, and the first sealing member is configured to seal a gap between the electrode terminal and the wall portion.

9. The battery of any one of claims 1-8, wherein, In the first direction, a projection of the terminal assembly is located in the through hole.

10. The battery of any one of claims 1-9, wherein, In the first direction, the wall portion abuts against the separation member.

11. The battery of claim 10, wherein, In the first direction, a second sealing member is arranged between the wall portion and the separation member, the wall portion abuts against the separation member through the second sealing member, the second sealing member is arranged around the terminal assembly, and the second sealing member is configured to seal a gap between the wall portion and the separation member.

12. The battery of any one of claims 1-11, wherein, The box body includes a first box body and a second box body arranged in the first direction, the first box body and the second box body are overlapped with each other and jointly define the assembly space; The partition is connected to an inner surface of the first case body facing the battery cell in the first direction, and the partition and the first case body jointly define the first space.

13. The battery of claim 12, wherein, The second case body has a bottom plate spaced apart from the partition in the first direction; In the first direction, the housing is disposed between the partition and the bottom plate, and the bottom plate is configured to support the battery cell.

14. The battery of any one of claims 1-13, wherein, The case body is provided with a first exhaust hole communicating with the first space.

15. The battery of claim 14, wherein, The battery further includes: A first valve is provided in the first exhaust hole, and the first valve is configured to allow gas in the first space to be discharged from the case body and to prevent liquid from entering the first space.

16. The battery of any one of claims 1-15, wherein, The battery cell further includes: A pressure relief member is provided on the housing, and the pressure relief member is configured to relieve internal pressure of the battery cell; The pressure relief member is located in the second space.

17. The battery of claim 16, wherein, The partition and the wall portion are arranged to face each other in the first direction, and the pressure relief member is provided on the wall portion.

18. The battery of claim 17, wherein, In the first direction, the partition forms an avoidance space corresponding to the pressure relief member, the avoidance space communicates with the second space, and the avoidance space does not communicate with the first space.

19. The battery of claim 18, wherein, In the first direction, a projection of the pressure relief member is located in the avoidance space.

20. The battery of claim 16, wherein, The partition and the wall portion are arranged to face each other in the first direction, and in the first direction, the pressure relief member is provided at an end of the housing away from the wall portion.

21. The battery of any one of claims 16-20, wherein, The case body is provided with a second exhaust hole communicating with the second space.

22. The battery of claim 21, wherein, The battery further includes: A second valve is provided in the second exhaust hole, and the second valve is configured to relieve internal pressure of the second space.

23. An electrical device comprising the battery of any one of claims 1-22, the battery being configured to provide electrical energy.

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