Battery monomer, battery and electric equipment

Abstract

The invention discloses a battery monomer, a battery pack and electric equipment, the battery monomer comprises a shell, a battery cell and a support structure, the shell comprises a first wall, the first wall is provided with an exhaust valve, and the inner wall surface of the first wall is provided with an insulating layer; the battery cell is arranged in the shell and comprises a pole group; the supporting structure is located between the pole group and the first wall so as to form an exhaust channel between the pole group and the first wall, and the melting point of at least part of the supporting structure is larger than that of the insulating layer. According to the battery monomer disclosed by the embodiment of the invention, the supporting structure is not easy to melt under the condition of thermal runaway of the battery, and at least part of the supporting structure is still supported between the pole group and the first wall, so that the exhaust channel is kept smooth, and the possibility that the battery cell blocks the exhaust valve can be reduced; the gas generated by the pole group can be exhausted to the exhaust valve through the exhaust channel and exhausted out of the shell, so that the problem of non-directional pressure relief of the battery cell can be relieved, and the potential safety hazard is reduced.

Description

Technical Field

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

[0002] On the shell of the battery cell, an insulating layer is usually provided between the first wall with the exhaust valve and the battery cell. During thermal runaway of the battery cell, due to the high internal temperature of the battery cell, the insulating layer will easily melt at high temperature, causing the insulating layer to lose its mechanical properties. The insulating layer cannot limit the battery cell, and the battery cell is easy to move in the shell and may move to the first wall. In this way, the battery cell is easy to block the exhaust valve, and the gas generated by the battery cell is difficult to be discharged through the exhaust valve, causing the gas to be pressurized in the shell, resulting in non-directional pressure release of the battery cell, posing a great safety hazard. Summary of the invention

[0003] The present invention provides a battery cell, a battery and an electrical device. In the case of thermal runaway of the battery, a support structure is supported between an electrode group and a first wall of the battery cell, and plays a role of limiting with the electrode group, thereby reducing the possibility of the battery cell blocking the exhaust valve. The gas generated by the electrode group can be discharged to the exhaust valve through the exhaust channel and discharged outside the shell, thereby alleviating the problem of non-directional pressure relief of the battery cell and reducing safety hazards.

[0004] In a first aspect, the present invention provides a battery cell, comprising: a shell, comprising a first wall, the first wall is provided with an exhaust valve, and the inner wall surface of the first wall is provided with an insulating layer; a battery cell, arranged in the shell and comprising a pole group; a support structure, located between the pole group and the first wall to form an exhaust channel between the pole group and the first wall, and the melting point of at least a part of the structure of the support structure is greater than the melting point of the insulating layer.

[0005] In the above technical solution, a supporting structure is provided between the electrode group and the first wall of the battery cell, so that a stable exhaust channel is formed between the electrode group and the first wall. The melting point of at least a part of the structure of the supporting structure is greater than the melting point of the insulating layer. The supporting structure is not easy to melt in the case of thermal runaway of the battery, and the supporting structure can still maintain its mechanical properties. The supporting structure can limit the electrode group, reduce the possibility of the battery cell blocking the exhaust valve, so that the exhaust channel can be kept unobstructed. The gas generated by the electrode group can be discharged to the exhaust valve through the exhaust channel and discharged outside the shell through the exhaust valve, which can relieve the pressure inside the shell and solve the problem of non-directional pressure relief of the battery cell caused by thermal runaway of the battery cell, thereby reducing safety hazards and improving the safety performance of the battery cell.

[0006] In some embodiments, the insulating layer is a plastic layer; and / or the melting point of the insulating layer is lower than 300°C.

[0007] In the above technical solution, the insulating layer is a plastic layer. The plastic layer has good insulation performance and can insulate the battery core from the first wall. In addition, the plastic layer has low cost and is easy to obtain.

[0008] In some embodiments, at least part of the support structure is made of at least one of a metal material, an inorganic non-metal material and a polymer material; and / or at least part of the support structure has a melting point greater than 300°C.

[0009] In the above technical solution, at least part of the structure of the support structure is made of at least one of a metal material, an inorganic non-metal material and a polymer material. The melting points of the metal material and the inorganic non-metal material are relatively high. The polymer material can be a polymer material with a relatively high melting point. The melting point of at least part of the structure of the support structure is relatively high. In the event of thermal runaway of the battery, at least part of the structure of the support structure is not easy to melt at high temperatures, so that the exhaust channel between the electrode group and the first wall can be maintained. The gas generated by the electrode group can be discharged to the exhaust point through the exhaust channel and discharged outside the shell through the exhaust valve to reduce safety hazards.

[0010] In some embodiments, a projection of the support structure on the first wall is located on an outer peripheral side of the exhaust valve.

[0011] In the above technical solution, the projection of the supporting structure on the first wall is located on the outer peripheral side of the exhaust valve, so that the exhaust resistance can be reduced and the exhaust can be smooth.

[0012] In some embodiments, the exhaust valve is located in the middle of the first wall in the length direction of the first wall, and the projection of the support structure on the first wall is located on opposite sides of the exhaust valve along the length direction of the first wall.

[0013] In the above technical solution, by locating the projection of the support structure on the first wall on opposite sides of the exhaust valve along the length direction of the first wall, the exhaust resistance can be reduced and the gas generated by the battery cell can be discharged to the exhaust valve conveniently; compared with the projection of the support structure on the first wall being located on opposite sides of the exhaust valve along the width direction of the first wall, the projection of the support structure on the first wall being located on opposite sides of the exhaust valve along the length direction of the first wall can facilitate the arrangement of the support structure and reduce the space occupied by the support structure in the shell.

[0014] In some embodiments, at least a portion of the support structure is adjacent to an edge of the pole group.

[0015] In the above technical solution, in the event of thermal runaway of the battery, the support structure is not easy to melt, and the support structure maintains its mechanical properties and is supported between the electrode group and the first wall. By having at least part of the edge of the support structure adjacent to the electrode group, the possibility of the electrode group moving toward the first wall and blocking the exhaust channel can be reduced.

[0016] In some embodiments, at least a portion of the support structure is adjacent to the exhaust valve.

[0017] In the above technical solution, the melting point of the support structure is relatively high. In the event of thermal runaway of the battery cell, at least part of the support structure is still supported between the first wall and the electrode group. By having at least part of the support structure adjacent to the exhaust valve, the possibility of the battery cell blocking the exhaust valve can be further reduced, thereby facilitating the exhaust of gas through the exhaust valve.

[0018] In some embodiments, the support structure includes a plurality of sub-support structures that are spaced apart from each other, and at least some of the sub-support structures are spaced apart from each other in a direction from an edge of the pole group to the exhaust valve.

[0019] In the above technical solution, at least part of the sub-support structure is arranged at intervals in the direction from the edge of the pole group to the exhaust valve, so that the first wall and the pole group are relatively stable. In the event of thermal runaway of the battery cell, the possibility of the battery cell blocking the exhaust valve is further reduced, the reliability of the exhaust channel is improved, exhaust is facilitated, and safety hazards are further reduced.

[0020] In some embodiments, part of the sub-support structure is close to the edge of the pole group, and part of the sub-support structure is close to the exhaust valve.

[0021] In the above technical solution, the arrangement position of the sub-support structure can not only improve the reliability of the exhaust channel, but also reduce the exhaust resistance, making it more convenient to exhaust the battery cell.

[0022] In some embodiments, the support structure includes a plurality of sub-support structures that are spaced apart from each other, and at least some of the sub-support structures are spaced apart from each other in a circumferential direction of the exhaust valve.

[0023] In the above technical solution, the melting point of the support structure is relatively high. In the event of thermal runaway of the battery cell, at least part of the support structure is still supported between the first wall and the pole group. By arranging at least part of the sub-support structures in a spaced manner in the circumferential direction of the exhaust valve, the possibility of the battery cell blocking the exhaust valve can be further reduced, further ensuring the reliability of the exhaust channel and facilitating the exhaust of gas through the exhaust valve.

[0024] In some embodiments, the support structure includes a supporting main structure and a weak structure, wherein the weak structure is arranged on the supporting main structure, the melting point of the supporting main structure is greater than the melting point of the insulating layer, and the melting point of the weak structure is less than the melting point of the supporting main structure. After the weak structure melts, an auxiliary channel connected to the exhaust channel is formed at the position of the weak structure on the supporting structure, and the auxiliary channel passes through the supporting structure in the direction from the edge of the pole group to the exhaust valve.

[0025] In the above technical solution, in the event of thermal runaway of the battery cell, the weak structure is easy to melt, and the auxiliary channel formed after the melting of the weak structure can provide more exhaust space for the gas, so that the auxiliary channel can be quickly opened; and the melting point of the supporting main structure is relatively high, which can maintain the reliability of the exhaust channel, so that the gas generated by the electrode group is discharged into the exhaust channel through the auxiliary channel, and then discharged outside the shell through the exhaust valve, which can better alleviate the problem of pressure buildup inside the shell.

[0026] In some embodiments, the supporting main structure includes a plurality of sub-support structures that are spaced apart from each other, and the weak structure is located between adjacent sub-support structures or the weak structure is embedded in the sub-support structure.

[0027] In the above technical solution, when a battery cell experiences thermal runaway, the weak structure melts and auxiliary channels are formed between adjacent sub-support structures, or auxiliary channels are formed on the sub-support structures. This provides more exhaust space for gas, facilitates exhaust, and better alleviates the problem of pressure buildup inside the shell.

[0028] In some embodiments, the melting point of the weak structure is no greater than the melting point of the insulating layer.

[0029] In the above technical solution, the melting point of the weak structure is not greater than the melting point of the insulating layer. When thermal runaway occurs in the battery cell, the weak structure melts first, and the auxiliary channel can be opened more quickly, so that timely exhaust can be achieved, further reducing safety hazards.

[0030] In some embodiments, the weak structure is made of plastic.

[0031] In the above technical solution, the plastic material is easy to melt at high temperature and the cost of the plastic material is relatively low.

[0032] In some embodiments, at least part of the support structure is made of a thermally expandable material.

[0033] In the above technical solution, at least part of the support structure is made of heat-expandable material. When thermal runaway occurs in the battery cell, at least part of the support structure expands due to the heat, so that the support structure can be better supported between the first wall and the pole group. In this way, the exhaust channel has stronger reliability and is more convenient for exhaust.

[0034] In some embodiments, when the support structure undergoes thermal expansion, a concave-convex structure is formed on a surface of the support structure facing the pole group.

[0035] In the above technical solution, a concave-convex structure is formed on the surface of the support structure facing the pole group, so that an exhaust space is formed between the surface of the support structure facing the pole group and the pole group. The exhaust space can be connected to the exhaust channel. The gas generated by the pole group can be discharged to the exhaust valve through the exhaust space and the exhaust channel, and then discharged outside the shell, which is more convenient for exhausting the pole group.

[0036] In some embodiments, the support structure is a porous structure, and at least part of the pores in the support structure penetrate the support structure in a direction from the edge of the electrode group to the exhaust valve.

[0037] In the above technical solution, at least part of the holes in the support structure penetrate the support structure in the direction from the edge of the pole group to the exhaust valve. The gas generated on the edge side of the pole group can be discharged to the exhaust valve through the holes and the exhaust channel, and discharged out of the shell through the exhaust valve. This can reduce the support structure from blocking the gas and reduce the exhaust resistance.

[0038] In some embodiments, the shell includes a main shell and a cover body, the cover body is covered on the open side of the main shell, the cover body includes the first wall, the first wall is provided with a pole, the battery cell includes a adapter plate, the adapter plate is provided on the side of the pole group adjacent to the first wall, and the adapter plate is used to electrically connect the pole group and the pole.

[0039] In the above technical solution, the electrode group and the electrode column are electrically connected through the adapter plate, and the adapter plate can serve as a current conduction path to form current conduction between the electrode group and the electrode column; and the electrode column and the exhaust valve are both arranged on the first wall, which is convenient for the production of the cover body, and also convenient for assembling the battery cell, and convenient for connecting the adapter plate between the electrode group and the electrode column.

[0040] In some embodiments, the support structure is fixed to the adapter.

[0041] In the above technical solution, the support structure is fixed to the adapter sheet, which can reduce the exhaust resistance compared to the support structure being fixed to the pole group. In addition, the adapter sheet (for example, made of metal material) has a higher melting point, and the adapter sheet is not easy to melt in the case of thermal runaway of the battery. Compared with the support structure being arranged in the insulating layer, the support structure is fixed to the adapter sheet through the support structure, so the support structure is more stable and not easy to move away from the original position.

[0042] In some embodiments, the support structure is located on a side of the adapter plate adjacent to the pole group.

[0043] In the above technical solution, the support structure is located on the side of the adapter plate adjacent to the pole group, which facilitates the electrical connection between the adapter plate and the pole; and, relative to the support structure being located on the side of the adapter plate away from the pole group, the support structure is located on the side of the adapter plate adjacent to the pole group, so that the adapter plate and the pole group are spaced apart and a accommodating space is formed. The accommodating space can be used to accommodate the pole ears on the pole group, thereby improving the utilization rate of the space in the shell, and the accommodating space can also be used as an exhaust space to facilitate the exhaust of the pole group.

[0044] In some embodiments, an insulating sheet is provided between the support structure and the pole group.

[0045] In the above technical solution, by arranging an insulating sheet between the support structure and the pole group, the insulating layer can maintain its stability without thermal runaway, thereby isolating the support structure from the pole group and reducing the possibility of short circuit caused by overlap between the support structure and the pole group.

[0046] In some embodiments, a pole ear is provided on the side of the pole group facing the first wall, the adapter plate electrically connects the pole ear and the pole column, the support structure is located on the outer peripheral side of the pole ear, and the projection of the support structure on the first wall and the projection of the pole ear on the first wall are both located on the outer peripheral side of the exhaust valve.

[0047] In the above technical solution, the support structure is located on the outer peripheral side of the pole ear, and it is recommended to reduce the interference of the support structure on the pole ear; by locating the projection of the support structure on the first wall and the projection of the pole ear on the first wall on the outer peripheral side of the exhaust valve, the obstruction of the support structure and the pole ear to the gas can be reduced, the exhaust resistance can be reduced, and the gas can be discharged to the exhaust valve through the exhaust channel and discharged to the outside of the shell through the exhaust valve. In the event of thermal runaway of the battery, the safety hazard can be further reduced.

[0048] In some embodiments, the spacing between the support structure and the tab is not less than 2 mm.

[0049] In the above technical solution, the distance L1 between the support structure and the pole ear is not less than 2 mm, so that the support structure is separated from the pole ear, reducing the possibility of short circuit caused by overlap between the support structure and the pole ear, and reducing the probability of interference with the pole ear when assembling the support structure.

[0050] In some embodiments, at least a portion of the support structure is located on a side of the electrode tab away from the exhaust valve.

[0051] In the above technical solution, by at least partially positioning the support structure on the side of the pole ear away from the exhaust valve, the exhaust resistance can be reduced, and the gas generated by the pole group can be discharged to the exhaust valve through the exhaust channel and then discharged to the outside of the shell through the exhaust valve.

[0052] In some embodiments, the support structure includes a plurality of spaced-apart sub-support structures, some of which are located on a side of the pole lug away from the exhaust valve, and some of which are located on a side of the pole lug close to the exhaust valve.

[0053] In the above technical solution, part of the sub-support structure is located on the side of the pole ear away from the exhaust valve, and part of the sub-support structure is located on the side of the pole ear close to the exhaust valve, so that the relative stability between the adapter plate and the pole ear can be improved, and the stability of the exhaust channel can be ensured, so that the exhaust channel can be kept unobstructed and exhaust is convenient.

[0054] In some embodiments, a receiving groove is formed on a side of the insulating layer facing the adapter plate, and the adapter plate is received in the receiving groove.

[0055] In the above technical solution, by accommodating the adapter plate in the accommodating groove, the stability of the cooperation between the adapter plate and the insulating layer can be enhanced.

[0056] In some embodiments, the distance between the outer circumferential wall of the adapter plate and the inner circumferential wall of the accommodating groove ranges from 0 to 5 mm.

[0057] In the above technical solution, the distance L2 between the outer wall of the adapter plate and the inner wall of the accommodating groove is in the range of 0 to 5 mm. When the adapter plate is assembled in the accommodating groove, the interference of the inner wall of the accommodating groove on the adapter plate can be reduced, so that the adapter plate can be assembled smoothly.

[0058] In some embodiments, at least a portion of the support structure is integrally formed with the adapter sheet.

[0059] In the above technical solution, by integrally forming at least part of the support structure with the adapter plate, the stability and reliability of the overall structure of the support structure and the adapter plate can be improved, and the connection structure and connection process between the support structure and the adapter plate can be reduced, which helps to improve the assembly efficiency of the battery cell.

[0060] In some embodiments, the battery cell includes two poles with opposite polarities, both poles are arranged on the first wall, the exhaust valve is located between the two poles, there are two adapter plates, the two adapter plates correspond to the two poles respectively, and the support structure is fixed on each adapter plate.

[0061] In the above technical solution, a support structure is fixed on each adapter plate. In the event of thermal runaway of the battery, the support structure is not easy to melt. This can improve the stability of the support structure supporting the adapter plate and keep the exhaust channel unobstructed for easy exhaust.

[0062] In some embodiments, in the direction from the pole group to the first wall, the size of the support structure is H, the size of the pole group is C, and the size H of the support structure and the size C of the pole group satisfy: 0.007≤H / C≤0.1.

[0063] In the above technical solution, the ratio of the size H of the support structure to the size C of the pole group is not less than 0.007, so that the size H of the support structure is not too small, and a larger exhaust channel can be provided for the pole group to achieve rapid exhaust; the ratio of the size H of the support structure to the size C of the pole group is not greater than 0.1, so that the size H of the support structure is not too large, and the distance between the first wall and the pole group is not too large, which can improve the utilization rate of the space in the shell, and help to improve the energy density of the battery.

[0064] In a second aspect, the present invention provides a battery, comprising: the above-mentioned battery cell.

[0065] In the above technical solution, by adopting the above-mentioned battery monomer, a support structure is arranged between the pole group and the first wall of the battery cell, so that a stable exhaust channel is formed between the pole group and the first wall, the melting point of at least part of the structure of the support structure is greater than the melting point of the insulating layer, the support structure is not easy to melt in the case of thermal runaway of the battery, and the support structure can still maintain its mechanical properties. The support structure can play a role in limiting the pole group, reducing the possibility of the battery cell blocking the exhaust valve, so that the exhaust channel can be kept unobstructed, and the gas generated by the pole group can be discharged to the exhaust valve through the exhaust channel and discharged outside the shell through the exhaust valve, which can relieve the pressure inside the shell, and can solve the problem of non-directional pressure relief of the battery cell caused by thermal runaway of the battery monomer, thereby reducing safety hazards and improving the safety performance of the battery monomer.

[0066] In a third aspect, the present invention provides an electrical device, comprising: the above-mentioned battery.

[0067] In the above technical solution, by adopting the above-mentioned battery, a support structure is arranged between the electrode group and the first wall of the battery cell, so that a stable exhaust channel is formed between the electrode group and the first wall, the melting point of at least part of the structure of the support structure is greater than the melting point of the insulating layer, the support structure is not easy to melt in the case of thermal runaway of the battery, and the support structure can still maintain its mechanical properties. The support structure can play a role in limiting the electrode group, reducing the possibility of the battery cell blocking the exhaust valve, so that the exhaust channel can be kept unobstructed, and the gas generated by the electrode group can be discharged to the exhaust valve through the exhaust channel and discharged outside the shell through the exhaust valve, which can relieve the pressure inside the shell, and can solve the problem of non-directional pressure release of the battery cell caused by thermal runaway of the battery cell, thereby reducing safety hazards and improving the safety performance of the battery cell.

[0068] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0070] Figure 1 is a schematic diagram of a partial structure of a battery cell according to some embodiments of the present invention;

[0071] Figure 2 is along Figure 1 Sectional view along line AA;

[0072] Figure 3 yes Figure 2 Enlarged view of point C in the middle;

[0073] Figure 4 is along Figure 1 Sectional view along the midline BB;

[0074] Figure 5 yes Figure 1 A cross-sectional view of a battery cell;

[0075] Figure 6 yes Figure 1 A cross-sectional view of a battery cell, wherein a surface of the support structure facing the electrode group is formed with a concave-convex structure;

[0076] Figure 7 yes Figure 6 The enlarged view of point D in the middle;

[0077] Figure 8 is an exploded view of a battery cell according to some embodiments of the present invention;

[0078] Fig. 9 yes Figure 8 Schematic diagram of the coordination between the adapter and the supporting structure;

[0079] Fig.10 yes Fig. 9 A schematic diagram of the cooperation between the adapter sheet and the support structure, wherein a concave-convex structure is formed on the surface of the support structure;

[0080] Fig.11 yes Figure 1 A cross-sectional view of a battery cell;

[0081] Fig.12 yes Fig.11 Enlarged view of point E in the middle;

[0082] Fig.13is a schematic diagram of cooperation between a support structure, a transfer sheet and an insulating layer according to some other embodiments of the present invention, wherein the support structure includes a sub-support structure;

[0083] Fig.14 yes Fig.13 Schematic diagram of the cooperation between the supporting structure and the adapter;

[0084] Fig.15 is a schematic diagram of cooperation between a support structure, a transfer sheet and an insulating layer according to some other embodiments of the present invention, wherein the support structure includes two sub-support structures;

[0085] Fig.16 yes Fig.15 Schematic diagram of the cooperation between the supporting structure and the adapter;

[0086] Fig.17 is a schematic diagram of cooperation between a support structure, a transfer sheet and an insulating layer according to some other embodiments of the present invention, wherein the support structure includes three sub-support structures;

[0087] Fig.18 yes Fig.17 Schematic diagram of the cooperation between the supporting structure and the adapter;

[0088] Fig.19 is a schematic diagram of the cooperation between the support structure and the adapter sheet according to some other embodiments of the present invention, wherein the weak structure is located between adjacent sub-support structures;

[0089] Fig. 20 is a schematic diagram of the cooperation between the support structure and the adapter sheet according to some other embodiments of the present invention, wherein the weak structure is embedded in the sub-support structure;

[0090] Fig.21 Schematic diagram of the support structure and the adapter according to some embodiments of the present invention, wherein the support structure is a porous structure

[0091] Fig. 22 is a schematic structural diagram of a battery according to some embodiments of the present invention;

[0092] Fig.23 is a schematic diagram of the structure of an electrical device according to some embodiments of the present invention.

[0093] Reference numerals:

[0094] 1000. Electrical equipment;

[0095] 100. Battery;

[0096] 10. Battery cells;

[0097] 1. battery cell; 11. pole group; 12. pole ear; 13. adapter; 131. raised part; 14. insulating sheet;

[0098] 2. Support structure; 21. Sub-support structure; 22. Support main structure; 23. Weak structure; 25. Hole; 26. Concave-convex structure;

[0099] 3. Cover body; 31. First wall; 32. Pole; 33. Exhaust valve;

[0100] 4. Insulating layer; 41. Accommodating groove; 42. Through hole;

[0101] 5. Exhaust channel. DETAILED DESCRIPTION

[0102] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0103] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by technicians in the technical field of the present invention; the terms used in the specification of the present invention in the application are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0104] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0105] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0106] The term "and / or" in the present invention is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.

[0107] In the embodiments of the present invention, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present invention shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary and should not constitute any limitation to the present invention.

[0108] The term “plurality” used in the present invention refers to two or more (including two).

[0109] In the present invention, the battery 100 refers to a single physical module including one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 mentioned in the present invention may include a battery cell 10, a battery module or a battery pack, etc. Some batteries 100 may include a box for encapsulating one or more battery cells 10 or multiple battery modules, and the box may include a top plate and a bottom plate. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cell 10. Of course, some batteries 100 may not include the above-mentioned box and are directly set in the battery installation compartment of the electrical device 1000.

[0110] In the present invention, the battery cell 10 may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery or a sodium-ion battery, etc., which is not limited in the embodiment of the present invention. The battery cell 10 may be cylindrical, flat, rectangular or other shapes, etc., which is not limited in the embodiment of the present invention. The battery cell 10 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, which is not limited in the embodiment of the present invention.

[0111] In the related art, an insulating layer is usually provided between the first wall with an exhaust valve and the battery cell on the shell of the battery cell. During thermal runaway of the battery cell, due to the high internal temperature of the battery cell, the insulating layer will easily melt at high temperature, causing the insulating layer to lose its mechanical properties. The insulating layer cannot limit the battery cell, and the battery cell is easy to move in the shell and may move to the first wall. In this way, the battery cell is easy to block the exhaust valve, and the gas generated by the battery cell is difficult to be discharged through the exhaust valve, causing the gas to be pressurized in the shell, resulting in non-directional pressure relief of the battery cell, posing a major safety hazard.

[0112] Based on this, the applicant proposed a battery cell 10, comprising: a shell, a battery cell 1 and a support structure 2, the shell comprising a first wall 31, the first wall 31 being provided with an exhaust valve 33, and the inner wall surface of the first wall 31 being provided with an insulating layer 4; the battery cell 1 is arranged in the shell and comprises a pole group 11; the support structure 2 is located between the pole group 11 and the first wall 31 to form an exhaust channel 5 between the pole group 11 and the first wall 31, and the melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4.

[0113] In the battery cell 10 of the above-mentioned structure, a support structure 2 is provided between the electrode group 11 of the battery cell 1 and the first wall 31, so that a stable exhaust channel 5 is formed between the electrode group 11 and the first wall 31. The melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. The support structure 2 is not easy to melt in the case of thermal runaway of the battery 100, and the support structure 2 can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can be kept unobstructed, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged outside the shell through the exhaust valve 33, which can relieve the pressure inside the shell, and solve the problem of non-directional pressure relief of the battery cell 1 caused by thermal runaway of the battery cell 10, thereby reducing safety hazards and improving the safety performance of the battery cell 10.

[0114] The battery 100 disclosed in the embodiment of the present invention can be used in, but not limited to, electrical equipment 1000 such as vehicles, ships or aircraft. The power supply system of the electrical equipment 1000 including the battery 100 disclosed in the present invention can be used to ensure the safety and reliability of the electrical equipment 1000.

[0115] For example, the electric device 1000 disclosed in the embodiment of the present invention may be, but is not limited to, a vehicle, a mobile phone, a tablet, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle may be a fuel vehicle, a gas vehicle, a new energy vehicle, or a rail vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, etc.

[0116] The battery cell 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0117] First, refer to Figure 1-Figure 4The present invention provides a battery cell 10, comprising: a shell, a battery cell 1 and a support structure 2, the shell comprising a first wall 31, the first wall 31 is provided with an exhaust valve 33, and the inner wall surface of the first wall 31 is provided with an insulating layer 4; the battery cell 1 is arranged in the shell and comprises a pole group 11; the support structure 2 is located between the pole group 11 and the first wall 31 to form an exhaust channel 5 between the pole group 11 and the first wall 31, and the melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4.

[0118] The support structure 2 is located between the electrode group 11 and the first wall 31 of the battery cell 1 to form an exhaust channel 5 between the electrode group 11 and the first wall 31. The gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, so as to facilitate the gas to be discharged outside the shell.

[0119] The melting point of at least part of the structure of the supporting structure 2 is greater than the melting point of the insulating layer 4, which may include the following situations: the melting point of the overall structure of the supporting structure 2 is greater than the melting point of the insulating layer 4; or, the melting point of part of the structure of the supporting structure 2 is greater than the melting point of the insulating layer 4, and the melting point of other parts of the structure of the supporting structure 2 is less than or equal to the melting point of the insulating layer 4.

[0120] The melting point of the overall structure of the support structure 2 is greater than the melting point of the insulating layer 4. In the event of thermal runaway of the battery 100, the support structure 2 is not easy to melt, and the support structure 2 as a whole can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reducing the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can remain unobstructed.

[0121] The melting point of a part of the support structure 2 is greater than the melting point of the insulating layer 4. In the event of thermal runaway of the battery 100, the part of the support structure 2 with a larger melting point is not easy to melt, and the support structure 2 can still maintain its mechanical properties, play a role in limiting the electrode group 11, and reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can remain unobstructed; the part of the support structure 2 with a smaller melting point may melt to form an exhaust path, which is more convenient for exhaust.

[0122] In the event of thermal runaway of the battery cell 10 , at least a portion of the support structure 2 is not easily melted, and the support structure 2 can maintain its mechanical properties and be supported between the electrode group 11 and the first wall 31 , so that the exhaust channel 5 remains unobstructed.

[0123] The inner wall surface of the first wall 31 is provided with an insulating layer 4, which can be located between the first wall 31 and the battery cell 1. In the absence of thermal runaway, the insulating layer 4 can maintain its stability, so that the battery cell 1 and the first wall 31 are insulated; in the event of thermal runaway, even if the insulating layer 4 melts, causing the support structure 2 to contact the first wall 31 to form a short circuit, the impact caused by the short circuit is much smaller than the impact caused by thermal runaway. For example, the insulating layer 4 can be plastic.

[0124] In the above technical solution, a support structure 2 is provided between the electrode group 11 and the first wall 31 of the battery cell 1, so that a stable exhaust channel 5 is formed between the electrode group 11 and the first wall 31. The melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. The support structure 2 is not easy to melt in the case of thermal runaway of the battery 100, and the support structure 2 can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can be kept unobstructed, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged outside the shell through the exhaust valve 33, which can relieve the pressure inside the shell, and solve the problem of non-directional pressure relief of the battery cell 1 caused by thermal runaway of the battery cell 10, thereby reducing safety hazards and improving the safety performance of the battery cell 10.

[0125] In some embodiments, the insulating layer 4 is a plastic layer.

[0126] For example, the insulating layer 4 is polypropylene.

[0127] In the above technical solution, the insulating layer 4 is a plastic layer. The plastic layer has good insulation performance and can insulate the battery core 1 from the first wall 31 . In addition, the plastic layer has low cost and is easy to obtain.

[0128] In some embodiments, the melting point of the insulating layer 4 is lower than 300°C.

[0129] In the above technical solution, the melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. In the case of thermal runaway of the battery cell 10, the insulating layer 4 is easy to melt, and the support structure 2 is not easy to melt, so that the exhaust channel 5 between the electrode group 11 and the first wall 31 can be maintained to facilitate exhaust.

[0130] In some embodiments, the insulating layer 4 is a plastic layer, and the melting point of the insulating layer 4 is lower than 300° C.

[0131] For example, the insulating layer 4 is made of polypropylene, which has a melting point lower than 300°C.

[0132] In the above technical solution, the insulating layer 4 is a plastic layer. The plastic layer has good insulation performance and can insulate the battery core 1 from the first wall 31 . In addition, the plastic layer has low cost and is easy to obtain.

[0133] In some embodiments, at least a portion of the support structure 2 is made of at least one of a metal material, an inorganic non-metal material, and a polymer material.

[0134] At least part of the structure of the support structure 2 is made of at least one of a metal material, an inorganic non-metal material and a polymer material, including the following situations: part of the structure of the support structure 2 is made of a metal material; or, part of the structure of the support structure 2 is made of a metal material and an inorganic non-metal material; or, part of the structure of the support structure 2 is made of an inorganic non-metal material and a polymer material; or, part of the structure of the support structure 2 is made of a metal material and a polymer material; or, part of the structure of the support structure 2 is made of a metal material, an inorganic non-metal material and a polymer material; or, the entire support structure 2 is made of a metal material, an inorganic non-metal material and a polymer material; or, the entire support structure 2 is made of a metal material; or, part of the structure of the support structure 2 is made of an inorganic non-metal material; or, part of the structure of the support structure 2 is made of a polymer material; or, the entire support structure 2 is made of a polymer material.

[0135] Among them, the melting points of metal materials and inorganic non-metallic materials are relatively high, and the polymer material can be a polymer material with a relatively high melting point. For example, the metal material can include at least one of copper, aluminum, steel, iron, aluminum alloy, and titanium alloy; the inorganic non-metallic material can include at least one of graphite, ceramic, and glass; the polymer material can include at least one of perfluoroalkoxy and polyetheretherketone.

[0136] In the above technical solution, at least part of the structure of the support structure 2 is made of at least one of a metal material, an inorganic non-metal material and a polymer material. The melting points of the metal material and the inorganic non-metal material are relatively high, and the polymer material can be a polymer material with a relatively high melting point. In this way, at least part of the structure of the support structure 2 has a relatively high melting point. In the event of thermal runaway of the battery 100, at least part of the structure of the support structure 2 is not easy to melt at high temperatures, so that the exhaust channel 5 between the electrode group 11 and the first wall 31 can be maintained, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged outside the shell through the exhaust valve 33 to reduce safety hazards.

[0137] In some embodiments, at least a portion of the support structure 2 has a melting point greater than 300°C.

[0138] The melting point of at least part of the structure of the support structure 2 is greater than 300°C, including the following situations: the melting point of a part of the structure of the support structure 2 is greater than 300°C, and the melting point of other parts of the support structure 2 is less than or equal to 300°C; or, the melting point of the entire structure of the support structure 2 is greater than 300°C.

[0139] The melting point of the overall structure of the support structure 2 is greater than 300°C. In the event of thermal runaway of the battery 100, the support structure 2 is not easy to melt, and the support structure 2 as a whole can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reducing the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can remain unobstructed.

[0140] The melting point of a part of the support structure 2 is greater than 300°C, and the melting point of other parts of the support structure 2 is less than or equal to 300°C. In the event of thermal runaway of the battery 100, the part of the support structure 2 with a melting point greater than 300°C is not easy to melt, and the support structure 2 can still maintain its mechanical properties, play a role in limiting the electrode group 11, and reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can remain unobstructed; the part of the support structure 2 with a smaller melting point may melt to form an exhaust path, which is more convenient for exhaust.

[0141] In the above technical solution, in the case of thermal runaway of the battery cell 10, the support structure 2 is not easy to melt, so that the exhaust channel 5 between the electrode group 11 and the first wall 31 can be kept unobstructed, which is convenient for exhaust.

[0142] In some embodiments, at least a portion of the support structure 2 is made of a metal material, an inorganic non-metal material or a polymer material, and the melting point of at least a portion of the support structure 2 is greater than 300°C.

[0143] At least part of the structure of the support structure 2 is made of metal material, inorganic non-metal material or polymer material, and the melting point of at least part of the structure of the support structure 2 is greater than 300°C, including the following situations: part of the structure of the support structure 2 is made of metal material, and the melting point of the support structure 2 made of metal material is greater than 300°C; or, the support structure 2 is made of metal material as a whole, and the melting point of the support structure 2 is greater than 300°C; or, part of the structure of the support structure 2 is made of inorganic non-metal material, and the melting point of the support structure 2 made of inorganic non-metal material is greater than 300°C; or, the support structure 2 is made of inorganic non-metal material as a whole, and the melting point of the support structure 2 is greater than 300°C; or, part of the structure of the support structure 2 is made of polymer material, and the melting point of the support structure 2 made of polymer material is greater than 300°C; or, the support structure 2 is made of polymer material as a whole, and the melting point of the support structure 2 is greater than 300°C.

[0144] In the above technical solution, at least part of the structure of the support structure 2 is made of at least one of a metal material, an inorganic non-metal material and a polymer material. The melting points of the metal material and the inorganic non-metal material are relatively high. The polymer material can be a polymer material with a relatively high melting point. The melting point of at least part of the structure of the support structure 2 is relatively high. In the event of thermal runaway of the battery 100, at least part of the structure of the support structure 2 is not easy to melt at high temperatures, so that the exhaust channel 5 between the electrode group 11 and the first wall 31 can be maintained, and the gas generated by the electrode group 11 can be discharged to the exhaust point through the exhaust channel 5 and discharged outside the shell through the exhaust valve 33 to reduce safety hazards.

[0145] In some embodiments, reference Figure 4-Figure 8 , the projection of the support structure 2 on the first wall 31 is located on the outer peripheral side of the exhaust valve 33 .

[0146] In the above technical solution, if the support structure 2 is opposite to the exhaust valve 33, the support structure 2 will increase the exhaust resistance to a certain extent. By positioning the projection of the support structure 2 on the first wall 31 on the outer peripheral side of the exhaust valve 33, the exhaust resistance can be reduced, making the exhaust smooth.

[0147] In some embodiments, reference Figure 8 In the length direction of the first wall 31 , the exhaust valve 33 is located in the middle of the first wall 31 , and the projection of the support structure 2 on the first wall 31 is located on opposite sides of the exhaust valve 33 along the length direction of the first wall 31 .

[0148] For example, the length direction of the first wall 31 may refer to the direction e1 in the drawings.

[0149] In the above technical solution, by locating the projection of the support structure 2 on the first wall 31 on opposite sides of the exhaust valve 33 along the length direction of the first wall 31, the exhaust resistance can be reduced, and the gas generated by the battery cell 1 can be discharged to the exhaust valve 33 conveniently; relative to the projection of the support structure 2 on the first wall 31 being located on opposite sides of the exhaust valve 33 along the width direction of the first wall 31, the projection of the support structure 2 on the first wall 31 being located on opposite sides of the exhaust valve 33 along the length direction of the first wall 31, the support structure 2 can be conveniently arranged, and the space occupied by the support structure 2 in the shell can be reduced.

[0150] In some embodiments, reference Figure 11-Figure 18 , at least part of the support structure 2 is adjacent to the edge of the pole group 11.

[0151] At least part of the support structure 2 is adjacent to the edge of the pole group 11 , including the following situations: part of the support structure 2 is adjacent to the edge of the pole group 11 ; or the entire support structure 2 is adjacent to the edge of the pole group 11 .

[0152] In the above technical solution, in the event of thermal runaway of the battery 100, the support structure 2 is not easy to melt, and the support structure 2 maintains its mechanical properties and is supported between the electrode group 11 and the first wall 31. By having at least part of the edge of the support structure 2 adjacent to the electrode group 11, the possibility of the electrode group 11 moving toward the first wall 31 and blocking the exhaust channel 5 can be reduced.

[0153] In some embodiments, reference Figure 8 , at least part of the support structure 2 is adjacent to the exhaust valve 33 .

[0154] At least part of the support structure 2 is adjacent to the exhaust valve 33 , which includes the following situations: a part of the support structure 2 is adjacent to the exhaust valve 33 ; or the entire support structure 2 is adjacent to the exhaust valve 33 .

[0155] In the above technical solution, the melting point of the support structure 2 is relatively high. In the event of thermal runaway of the battery cell 10, at least a portion of the support structure 2 is still supported between the first wall 31 and the electrode group 11. By at least a portion of the support structure 2 being adjacent to the exhaust valve 33, the possibility of the battery cell 1 blocking the exhaust valve 33 can be further reduced, thereby facilitating the exhaust of gas through the exhaust valve 33.

[0156] In some embodiments, reference Figure 8-Figure 11 The support structure 2 includes a plurality of sub-support structures 21 that are spaced apart from each other, and at least some of the sub-support structures 21 are spaced apart from each other in the direction from the edge of the pole group 11 to the exhaust valve 33 .

[0157] At least part of the sub-support structures 21 are arranged at intervals in the direction from the edge of the pole group 11 to the exhaust valve 33, including the following situations: multiple sub-support structures 21 of the support structure 2 are arranged at intervals in the direction from the edge of the pole group 11 to the exhaust valve 33; or, part of the sub-support structures 21 among the multiple sub-support structures 21 are arranged at intervals in the direction from the edge of the pole group 11 to the exhaust valve 33.

[0158] In the above technical solution, at least part of the sub-support structure 21 is arranged at intervals in the direction from the edge of the pole group 11 to the exhaust valve 33, so that the first wall 31 and the pole group 11 are relatively stable. In the event of thermal runaway of the battery cell 10, the possibility of the battery cell 1 blocking the exhaust valve 33 is further reduced, the reliability of the exhaust channel 5 is improved, exhaust is facilitated, and safety hazards are further reduced.

[0159] In some embodiments, reference Figure 8-Figure 10 Part of the sub-support structure 21 is close to the edge of the pole group 11 , and part of the sub-support structure 21 is close to the exhaust valve 33 .

[0160] In the above technical solution, the arrangement position of the sub-support structure 21 can not only improve the reliability of the exhaust channel 5, but also reduce the exhaust resistance, making it more convenient to exhaust the battery cell 1.

[0161] In some embodiments, reference Figure 8 and Fig. 9 The support structure 2 includes a plurality of sub-support structures 21 that are spaced apart from each other, and at least some of the sub-support structures 21 are spaced apart from each other in the circumferential direction of the exhaust valve 33 .

[0162] At least part of the sub-support structures 21 are arranged at intervals in the circumferential direction of the exhaust valve 33, including the following situations: multiple sub-support structures 21 of the support structure 2 are arranged at intervals in the circumferential direction of the exhaust valve 33; or, part of the sub-support structures 21 of the multiple sub-support structures 21 are arranged at intervals in the circumferential direction of the exhaust valve 33.

[0163] In the above technical solution, the melting point of the support structure 2 is relatively high. In the event of thermal runaway of the battery cell 10, at least a portion of the support structure 2 is still supported between the first wall 31 and the pole group 11. By arranging at least a portion of the sub-support structures 21 in a spaced manner in the circumferential direction of the exhaust valve 33, the possibility of the battery cell 1 blocking the exhaust valve 33 can be further reduced, further ensuring the reliability of the exhaust channel 5 and facilitating the exhaust of gas through the exhaust valve 33.

[0164] In some embodiments, reference Fig.19 and Fig. 20 The support structure 2 includes a support main structure 22 and a weak structure 23. The weak structure 23 is arranged on the support main structure 22. The melting point of the support main structure 22 is greater than the melting point of the insulating layer 4, and the melting point of the weak structure 23 is less than the melting point of the support main structure 22. After the weak structure 23 is melted, an auxiliary channel connected to the exhaust channel 5 is formed at the position of the weak structure 23 on the support structure 2. The auxiliary channel runs through the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33.

[0165] The weak structure 23 may also be a part of the supporting structure 2 with lower structural strength. When thermal runaway occurs in the battery cell 10, the gas generated by the electrode group 11 increases sharply. Under the impact of the airflow, the weak structure 23 is easily destroyed, and the auxiliary channel is quickly opened to achieve rapid exhaust.

[0166] In the above technical solution, in the event of thermal runaway of the battery cell 10, the weak structure 23 is easily melted, and the auxiliary channel formed after the melting of the weak structure 23 can provide more exhaust space for the gas, so that the auxiliary channel can be quickly opened; and the melting point of the supporting main structure 22 is relatively high, which can maintain the reliability of the exhaust channel 5, so that the gas generated by the electrode group 11 is discharged into the exhaust channel 5 through the auxiliary channel, and then discharged out of the shell through the exhaust valve 33, which can better alleviate the problem of pressure buildup inside the shell.

[0167] In some embodiments, reference Fig.19 and Fig. 20 The supporting main structure 22 includes a plurality of sub-support structures 21 that are spaced apart from each other, and the weak structure 23 is located between adjacent sub-support structures 21 or the weak structure 23 is embedded in the sub-support structure 21 .

[0168] In the above technical solution, when thermal runaway occurs in the battery cell 10, the weak structure 23 melts, and an auxiliary channel is formed between adjacent sub-support structures 21, or an auxiliary channel is formed on the sub-support structure 21. This can provide more exhaust space for the gas, facilitate exhaust, and better alleviate the problem of pressure buildup inside the shell.

[0169] In some embodiments, the melting point of the weak structure 23 is not greater than the melting point of the insulating layer 4 .

[0170] For example, the melting point of the weak structure 23 may be lower than the melting point of the insulating layer 4 ; or, the melting point of the weak structure 23 may be equal to the melting point of the insulating layer 4 .

[0171] In the above technical solution, the melting point of the weak structure 23 is not greater than the melting point of the insulating layer 4. When the battery cell 10 has thermal runaway, the weak structure 23 melts first, and the auxiliary channel can be opened more quickly, so that timely exhaust can be achieved, further reducing safety hazards.

[0172] In some embodiments, the weak structure 23 is made of plastic.

[0173] For example, the material of the weak structure 23 may be polyvinyl chloride.

[0174] In the above technical solution, the plastic material is easy to melt at high temperature and the cost of the plastic material is relatively low.

[0175] In some embodiments, at least part of the structure of the support structure 2 is made of a thermally expandable material.

[0176] The thermal expansion material expands in volume when heated. For example, the thermal expansion material may be expanded graphite, vermiculite, or the like.

[0177] At least part of the structure of the support structure 2 is made of thermal expansion material, which may include the following situations: part of the structure of the support structure 2 is made of thermal expansion material; or the entire support structure 2 is made of thermal expansion material.

[0178] In the above technical solution, at least part of the structure of the support structure 2 is made of a thermal expansion material. When thermal runaway occurs in the battery cell 10, at least part of the support structure 2 expands due to the heat, so that the support structure 2 can be better supported between the first wall 31 and the pole group 11, and the space of the exhaust channel 5 is larger. In this way, the reliability of the exhaust channel 5 is stronger and the exhaust is more convenient.

[0179] In some embodiments, reference Figure 6-Figure 10 When the support structure 2 undergoes thermal expansion, a concavo-convex structure 26 is formed on the surface of the support structure 2 facing the pole group 11 .

[0180] In the above technical solution, a concave-convex structure 26 is formed on the surface of the support structure 2 facing the pole group 11, so that an exhaust structure is formed between the surface of the support structure 2 facing the pole group 11 and the pole group 11, and the exhaust structure can be connected to the exhaust channel 5. The gas generated by the pole group 11 can be discharged to the exhaust valve 33 through the exhaust structure and the exhaust channel 5, and then discharged out of the shell, which is more convenient for exhausting the pole group 11.

[0181] In some embodiments, reference Fig.21 The support structure 2 is a porous structure, and at least part of the channels 25 in the support structure 2 penetrate the support structure 2 in the direction from the edge of the electrode group 11 to the exhaust valve 33.

[0182] At least part of the holes 25 in the support structure 2 penetrate the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33, which may include the following situations: all the holes 25 in the support structure 2 penetrate the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33; or, part of the holes 25 in the support structure 2 penetrate the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33.

[0183] In the above technical solution, at least part of the holes 25 in the support structure 2 penetrate the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33. The gas generated on the edge side of the pole group 11 can be discharged to the exhaust valve 33 through the holes 25 and the exhaust channel 5, and discharged out of the shell through the exhaust valve 33. This can reduce the support structure 2 from blocking the gas and reduce the exhaust resistance.

[0184] In some embodiments, reference Figure 8The shell includes a main shell and a cover body 3, the cover body 3 is covered on the open side of the main shell, the cover body 3 includes a first wall 31, and a pole 32 is provided on the first wall 31. The battery cell 1 includes a transfer plate 13, and the transfer plate 13 is provided on a side of the pole group 11 adjacent to the first wall 31. The transfer plate 13 is used to electrically connect the pole group 11 and the pole 32.

[0185] For example, two poles 32 are provided on the first wall 31, one of which is a positive pole 32, and the other is a negative pole 32; there can be two adapter plates 13, one of which is used to electrically connect the pole group 11 and the positive pole 32, and the other is used to electrically connect the pole group 11 and the negative pole 32.

[0186] In the above technical solution, the electrode group 11 and the pole 32 are electrically connected through the adapter 13, and the adapter 13 can serve as a current conduction path to form current conduction between the electrode group 11 and the pole 32; and, the pole 32 and the exhaust valve 33 are both arranged on the first wall 31, which is convenient for the production of the cover body 3, and also convenient for assembling the battery cell 10, and convenient for connecting the adapter 13 between the electrode group 11 and the pole 32.

[0187] In some embodiments, reference Figure 9-10 , the supporting structure 2 is fixed to the adapter plate 13 .

[0188] For example, the support structure 2 and the adapter sheet 13 may be connected by welding, bonding or integrally formed.

[0189] In the above technical solution, the support structure 2 is fixed to the adapter sheet 13, which can reduce the exhaust resistance compared to the support structure 2 being fixed to the electrode group 11; in addition, the adapter sheet 13 (for example, made of metal material) has a higher melting point, and the adapter sheet 13 is not easy to melt in the case of thermal runaway of the battery 100. Compared with the support structure 2 being arranged on the insulating layer 4, the support structure 2 is fixed to the adapter sheet 13 through the support structure 2, so the support structure 2 is more stable and not easy to move away from the original position.

[0190] In some embodiments, reference Figure 8 The support structure 2 is located on a side of the adapter plate 13 adjacent to the pole group 11 .

[0191] In the above technical solution, the support structure 2 is located on the side of the adapter plate 13 adjacent to the pole group 11, which facilitates the electrical connection between the adapter plate 13 and the pole 32; and, relative to the support structure 2 being located on the side of the adapter plate 13 away from the pole group 11, the support structure 2 is located on the side of the adapter plate 13 adjacent to the pole group 11, so that the adapter plate 13 and the pole group 11 are spaced apart and a accommodating space is formed, and the accommodating space can be used to accommodate the pole ear 12 on the pole group 11, thereby improving the utilization rate of the space in the shell; the accommodating space can also be used as an exhaust space to facilitate the exhaust of the pole group 11.

[0192] In some embodiments, reference Figure 8 An insulating sheet 14 is provided between the supporting structure 2 and the pole group 11 .

[0193] For example, the insulating sheet 14 can be made of polypropylene or polyimide. The melting point of polyimide is relatively high. When the insulating sheet 14 is made of polyimide, the insulating sheet 14 is not easy to melt in the case of thermal runaway of the battery 100, and can still maintain its insulation performance. In the case of no thermal runaway, the insulating sheet 14 can maintain its stability, so that the support structure 2 and the pole group 11 are insulated; in the case of thermal runaway, even if the insulating sheet 14 melts, resulting in a short circuit between the pole group 11 and the support structure 2, the impact caused by the short circuit is much smaller than the impact caused by thermal runaway.

[0194] In the above technical solution, by arranging an insulating sheet 14 between the support structure 2 and the pole group 11, the insulating layer 4 can maintain its stability when thermal runaway does not occur, so that the support structure 2 and the pole group 11 are insulated, reducing the possibility of short circuit caused by overlap between the support structure 2 and the pole group 11.

[0195] In some embodiments, reference Figure 8-Figure 11 A pole ear 12 is provided on the side of the pole group 11 facing the first wall 31, and the adapter plate 13 electrically connects the pole ear 12 and the pole column 32. The support structure 2 is located on the outer peripheral side of the pole ear 12, and the projection of the support structure 2 on the first wall 31 and the projection of the pole ear 12 on the first wall 31 are both located on the outer peripheral side of the exhaust valve 33.

[0196] For example, two pole ears 12 may be provided on the side of the pole group 11 facing the first wall 31, wherein one pole ear 12 is a positive pole ear 12, and the other pole ear 12 is a negative pole ear 12, and the two pole ears 12 may be folded pole ears 12; the adapter plate 13 may be located between the pole ear 12 and the first wall 31, and there may be two adapter plates 13, wherein one adapter plate 13 is used to electrically connect the positive pole ear 12 and the positive pole column 32, and the other adapter plate 13 is used to electrically connect the negative pole ear 12 and the negative pole column 32.

[0197] In the above technical solution, the support structure 2 is located on the outer peripheral side of the pole ear 12, and it is recommended to reduce the interference of the support structure 2 on the pole ear 12; by the projection of the support structure 2 on the first wall 31 and the projection of the pole ear 12 on the first wall 31 are both located on the outer peripheral side of the exhaust valve 33, the obstruction of the support structure 2 and the pole ear 12 to the gas can be reduced, the exhaust resistance can be reduced, and the gas can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged to the outside of the shell through the exhaust valve 33. In the event of thermal runaway of the battery 100, the safety hazard can be further reduced.

[0198] In some embodiments, reference Fig.12, the distance L1 between the support structure 2 and the pole ear 12 is not less than 2 mm.

[0199] For example, the distance L1 between the support structure 2 and the tab 12 may be 2 mm, 2.5 mm, 3 mm or 4 mm.

[0200] In the above technical solution, the distance L1 between the support structure 2 and the pole lug 12 is not less than 2 mm, so that the support structure 2 is separated from the pole lug 12, reducing the possibility of short circuit caused by overlap between the support structure 2 and the pole lug 12, and the probability of interference with the pole lug 12 can be reduced when assembling the support structure 2.

[0201] In some embodiments, reference Figure 8-Figure 11 At least part of the support structure 2 is located on the side of the pole ear 12 away from the exhaust valve 33 .

[0202] At least part of the support structure 2 is located on the side of the pole lug 12 away from the exhaust valve 33, which may include the following situations: part of the support structure 2 is located on the side of the pole lug 12 away from the exhaust valve 33; or the entire support structure 2 is located on the side of the pole lug 12 away from the exhaust valve 33.

[0203] In the above technical solution, by at least partially positioning the support structure 2 on the side of the pole ear 12 away from the exhaust valve 33, the exhaust resistance can be reduced, and the gas generated by the pole group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5 and then discharged to the outside of the shell through the exhaust valve 33.

[0204] In some embodiments, reference Figure 8 and Fig. 9 The support structure 2 includes a plurality of spaced-apart sub-support structures 21 , some of which are located on a side of the pole ear 12 away from the exhaust valve 33 , and some of which are located on a side of the pole ear 12 close to the exhaust valve 33 .

[0205] In the above technical solution, part of the sub-support structure 21 is located on the side of the pole ear 12 away from the exhaust valve 33, and part of the sub-support structure 21 is located on the side of the pole ear 12 close to the exhaust valve 33. This can improve the relative stability between the adapter plate 13 and the pole ear 12, and ensure the stability of the exhaust channel 5, so that the exhaust channel 5 can remain unobstructed and exhaust is convenient.

[0206] In some embodiments, reference Figure 2 and Figure 3 A receiving groove 41 is formed on one side of the insulating layer 4 facing the adapter plate 13 , and the adapter plate 13 is received in the receiving groove 41 .

[0207] In the above technical solution, by accommodating the adapter plate 13 in the accommodating groove 41 , the stability of the cooperation between the adapter plate 13 and the insulating layer 4 can be enhanced.

[0208] In some embodiments, reference Figure 3 The distance L2 between the outer peripheral wall of the adapter plate 13 and the inner peripheral wall of the accommodating groove 41 is in the range of 0 to 5 mm.

[0209] For example, the distance L2 between the outer circumferential wall of the adapter plate 13 and the inner circumferential wall of the accommodating groove 41 may be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, or 5 mm.

[0210] In the above technical solution, the distance L2 between the outer wall of the adapter plate 13 and the inner wall of the accommodating groove 41 is in the range of 0 to 5 mm. When the adapter plate 13 is assembled in the accommodating groove 41, the interference of the inner wall of the accommodating groove 41 on the adapter plate 13 can be reduced, so that the adapter plate 13 can be assembled smoothly.

[0211] In some embodiments, at least a portion of the support structure 2 is integrally formed with the adapter sheet 13 .

[0212] At least part of the support structure 2 is integrally formed with the adapter plate 13 , which may include the following situations: a part of the support structure 2 is integrally formed with the adapter plate 13 ; or the entire support structure 2 is integrally formed with the adapter plate 13 .

[0213] In the above technical solution, by integrally forming at least a portion of the support structure 2 with the adapter plate 13, the stability and reliability of the overall structure of the support structure 2 and the adapter plate 13 can be improved, and the connection structure and connection process between the support structure 2 and the adapter plate 13 can be reduced, which helps to improve the assembly efficiency of the battery cell 10.

[0214] In some embodiments, reference Figure 8 The battery cell 10 includes two poles 32 with opposite polarities, both poles 32 are arranged on the first wall 31, the exhaust valve 33 is located between the two poles 32, there are two adapter plates 13, the two adapter plates 13 correspond to the two poles 32 respectively, and a support structure 2 is fixed on each adapter plate 13.

[0215] For example, the two poles 32 are respectively a positive pole 32 and a negative pole 32 , one of the two adapter plates 13 is connected to the positive pole 32 , and the other adapter plate 13 is connected to the negative pole 32 .

[0216] In the above technical solution, a support structure 2 is fixed on each adapter plate 13. In the event of thermal runaway of the battery 100, the support structure 2 is not easy to melt. This can improve the stability of the support structure 2 supporting the adapter plate 13 and keep the exhaust channel 5 unobstructed for easy exhaust.

[0217] In some embodiments, reference Figure 4 In the direction from the pole group 11 to the first wall 31, the size of the support structure 2 is H, the size of the pole group 11 is C, and the size H of the support structure 2 and the size C of the pole group 11 satisfy: 0.007≤H / C≤0.1.

[0218] For example, the dimension H of the support structure 2 and the dimension C of the pole group 11 may be 0.007, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, or 0.1.

[0219] In the above technical solution, the ratio of the size H of the support structure 2 to the size C of the electrode group 11 is not less than 0.007, so that the size H of the support structure 2 is not too small, and a larger exhaust channel 5 can be provided for the electrode group 11 to achieve rapid exhaust; the ratio of the size H of the support structure 2 to the size C of the electrode group 11 is not greater than 0.1, so that the size H of the support structure 2 is not too large, and the distance between the first wall 31 and the electrode group 11 is not too large, which can improve the utilization rate of the space in the shell, and help to improve the energy density of the battery 100.

[0220] Second, refer to Fig. 22 The present invention provides a battery 100, comprising: the above-mentioned battery cell 10.

[0221] In the above technical solution, by adopting the above-mentioned battery cell 10, a support structure 2 is arranged between the electrode group 11 and the first wall 31 of the battery cell 1, so that a stable exhaust channel 5 is formed between the electrode group 11 and the first wall 31, and the melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. The support structure 2 is not easy to melt in the case of thermal runaway of the battery 100, and the support structure 2 can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can be kept unobstructed, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged from the shell through the exhaust valve 33, which can relieve the pressure inside the shell, and solve the problem of non-directional pressure relief of the battery cell 1 caused by thermal runaway of the battery cell 10, thereby reducing safety hazards and improving the safety performance of the battery cell 10.

[0222] Thirdly, refer to Fig.23The present invention proposes an electrical device 1000, comprising: the battery 100 mentioned above.

[0223] The battery 100 can provide electrical energy to the electrical device 1000, for example, Fig.23 The electrical device 1000 may be a vehicle, the battery 100 may provide electrical energy for the vehicle, and the battery 100 may serve as a driving power source for the vehicle to provide driving force for the vehicle.

[0224] In the above technical solution, by adopting the above-mentioned battery 100, a support structure 2 is arranged between the electrode group 11 and the first wall 31 of the battery cell 1, so that a stable exhaust channel 5 is formed between the electrode group 11 and the first wall 31, and the melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. The support structure 2 is not easy to melt in the case of thermal runaway of the battery 100, and the support structure 2 can still maintain its mechanical properties. The support structure 2 can play a role in limiting the electrode group 11, reducing the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can be kept unobstructed, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged from the shell through the exhaust valve 33, which can relieve the pressure inside the shell, and can solve the problem of non-directional pressure relief of the battery cell 1 caused by thermal runaway of the battery cell 10, thereby reducing safety hazards and improving the safety performance of the battery cell 10.

[0225] In some embodiments of the present invention, reference Figure 1-Figure 12 The battery cell 10 includes a housing, a battery cell 1 and a support structure 2. The housing includes a main housing and a cover 3. The cover 3 is disposed on the open side of the main housing. The cover 3 includes a first wall 31. The first wall 31 is provided with an exhaust valve 33 and two poles 32. The two poles 32 are respectively a positive pole 32 and a negative pole 32. The exhaust valve 33 is located between the two poles 32.

[0226] The battery cell 1 is arranged in the shell, and the battery cell 1 includes a pole group 11, a pole ear 12 and a transfer plate 13. The pole ear 12 is arranged on the side of the pole group 11 facing the first wall 31, and the transfer plate 13 is arranged on the side of the pole group 11 adjacent to the first wall 31, and the transfer plate 13 is located between the pole ear 12 and the first wall 31. The transfer plate 13 is used to electrically connect the pole ear 12 and the pole column 32 on the first wall 31, and the pole ear 12 is welded to the transfer plate 13. There are two pole ears 12, and the two pole ears 12 are respectively a positive pole ear 12 and a negative pole ear 12. There are two transfer plates 13, one of which electrically connects the positive pole ear 12 with the positive pole column 32, and the other transfer plate 13 electrically connects the negative pole ear 12 with the negative pole column 32.

[0227] The inner wall surface of the first wall 31 is provided with an insulating layer 4, which is a plastic layer. The insulating layer 4 is made of PP, and the melting point of the insulating layer 4 is lower than 300°C. A plurality of spaced positioning posts are formed on the side of the insulating layer 4 facing the first wall 31, and a plurality of positioning holes are provided on the first wall 31. The number of the positioning holes is the same as that of the positioning posts, and the positions correspond one to one. The positioning posts are suitable for being penetrated through the positioning holes to connect the insulating layer 4 with the first wall 31. Two spaced through holes 42 are provided on the insulating layer 4, and a protrusion 131 protruding toward the direction of the first wall 31 is formed on the adapter 13. There are two adapters 13, and the protrusions 131 on the two adapters 13 correspond one to one with the two through holes 42, respectively, and the protrusions 131 are suitable for being penetrated in the corresponding through holes 42, so that the protrusions 131 are connected with the pole 32, thereby realizing that the adapter 13 electrically connects the pole ear 12 with the pole 32.

[0228] A receiving groove 41 is formed on one side of the insulating layer 4 facing the adapter plate 13, and the adapter plate 13 is received in the receiving groove 41. The spacing L2 between the outer peripheral wall of the adapter plate 13 and the inner peripheral wall of the receiving groove 41 ranges from 0 to 5 mm. The support structure 2 is fixed to the adapter plate 13, and a portion of the support structure 2 is adjacent to the edge of the pole group 11.

[0229] The support structure 2 is located between the pole group 11 and the first wall 31 to form an exhaust channel 5 between the pole group 11 and the first wall 31. In the direction from the pole group 11 to the first wall 31, the size of the support structure 2 is H, and the size of the pole group 11 is C. The size H of the support structure 2 and the size C of the pole group 11 satisfy: 0.007≤H / C≤0.1. The melting point of the support structure 2 is greater than the melting point of the insulating layer 4, and the melting point of the support structure 2 is greater than 300°C. The support structure 2 is made of a heat-expanding material at least in part of its structure. When the support structure 2 undergoes thermal expansion, a concave-convex structure 26 is formed on the surface of the support structure 2 facing the pole group 11.

[0230] The support structure 2 is located on one side of the adapter plate 13 adjacent to the pole group 11, and the support structure 2 is fixed on both adapter plates 13, and an insulating sheet 14 is provided between the support structure 2 and the pole group 11. The support structure 2 is located on the outer peripheral side of the pole ear 12, and the projection of the support structure 2 on the first wall 31 and the projection of the pole ear 12 on the first wall 31 are both located on the outer peripheral side of the exhaust valve 33. The range of the spacing L1 between the support structure 2 and the pole ear 12 is not less than 2 mm.

[0231] The support structure 2 includes a plurality of spaced-apart sub-support structures 21, a portion of the sub-support structures 21 being located on a side of the pole ear 12 away from the exhaust valve 33 and being spaced apart in the circumferential direction of the exhaust valve 33; another portion of the sub-support structures 21 being located on a side of the pole ear 12 away from the exhaust valve 33 and being adjacent to the edge of the pole group 11.

[0232] In the above technical solution, a support structure 2 is arranged between the electrode group 11 and the first wall 31 of the battery cell 1, so that a stable exhaust channel 5 is formed between the electrode group 11 and the first wall 31. The melting point of at least part of the structure of the support structure 2 is greater than the melting point of the insulating layer 4. The support structure 2 is not easy to melt in the case of thermal runaway of the battery 100, and the support structure 2 can still maintain its mechanical properties. The support structure 2 can limit the electrode group 11, reduce the possibility of the battery cell 1 blocking the exhaust valve 33, so that the exhaust channel 5 can be kept unobstructed, and the gas generated by the electrode group 11 can be discharged to the exhaust valve 33 through the exhaust channel 5, and discharged from the shell through the exhaust valve 33, which can relieve the pressure inside the shell, and can solve the problem of non-directional pressure relief of the battery cell 1 caused by thermal runaway of the battery cell 10, thereby reducing safety hazards and improving the safety performance of the battery cell 10.

[0233] In other embodiments of the present invention, referring to Figure 13-Figure 18 The structure of this embodiment is substantially the same as that of the above embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the support structure 2 includes a sub-support structure 21, which is located on the side of the pole ear 12 away from the exhaust valve 33 and adjacent to the edge of the pole group 11. Alternatively, the support structure 2 includes multiple (two or three) sub-support structures 21, which are all located on the side of the pole ear 12 away from the exhaust valve 33 and adjacent to the edge of the pole group 11.

[0234] In the above technical solution, when thermal runaway occurs in the battery 100, the edge of the adjacent pole group 11 of the support structure 2 can reduce the possibility of the pole group 11 moving toward the first wall 31 and blocking the exhaust channel 5, and can reduce the exhaust resistance.

[0235] In some other embodiments of the present invention, referring to Fig.19 and Fig. 20 The structure of this embodiment is substantially the same as that of the above embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that: the support structure 2 includes a support main structure 22 and a weak structure 23, the weak structure 23 is arranged on the support main structure 22, the melting point of the support main structure 22 is greater than the melting point of the insulating layer 4, the melting point of the weak structure 23 is less than the melting point of the support main structure 22, the melting point of the weak structure 23 is not greater than the melting point of the insulating layer 4, and the material of the weak structure 23 is plastic material. After the weak structure 23 is melted, an auxiliary channel connected to the exhaust channel 5 is formed at the position of the weak structure 23 on the support structure 2, and the auxiliary channel penetrates the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33.

[0236] The supporting main structure 22 includes a plurality of sub-support structures 21 that are spaced apart from each other. The weak structure 23 is located between adjacent sub-support structures 21 or the weak structure 23 is embedded in the sub-support structure 21 .

[0237] In the above technical solution, in the event of thermal runaway of the battery cell 10, the weak structure 23 is easily melted, and the auxiliary channel formed after the melting of the weak structure 23 can provide more exhaust space for the gas, so that the auxiliary channel can be quickly opened; and the melting point of the supporting main structure 22 is relatively high, which can maintain the reliability of the exhaust channel 5, so that the gas generated by the electrode group 11 is discharged into the exhaust channel 5 through the auxiliary channel, and then discharged out of the shell through the exhaust valve 33, which can better alleviate the problem of pressure buildup inside the shell.

[0238] In some further embodiments of the present invention, referring to Fig.21 The structure of this embodiment is substantially the same as that of the above-mentioned embodiment, wherein the same components are marked with the same reference numerals, and the only difference is that the support structure 2 is a porous structure, and a plurality of channels 25 are formed in the support structure 2, and the plurality of channels 25 penetrate the support structure 2 in the direction from the edge of the pole group 11 to the exhaust valve 33.

[0239] In the above technical solution, multiple channels 25 penetrate the support structure 2 from the edge of the pole group 11 to the exhaust valve 33. The gas generated by the pole group 11 can be discharged to the exhaust valve 33 through the channel 25 and the exhaust channel 5, and discharged out of the shell through the exhaust valve 33. This can reduce the support structure 2 from blocking the gas and reduce the exhaust resistance.

[0240] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0241] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall, wherein the first wall is provided with an exhaust valve, and an inner wall surface of the first wall is provided with an insulating layer; A battery cell, disposed in the housing and comprising a pole group; A support structure is located between the pole group and the first wall to form an exhaust channel between the pole group and the first wall, and the melting point of at least a part of the support structure is greater than the melting point of the insulating layer.

2. The battery cell according to claim 1, characterized in that: The insulating layer is a plastic layer; and / or the melting point of the insulating layer is lower than 300°C.

3. The battery cell according to claim 1, characterized in that: At least part of the support structure is made of at least one of a metal material, an inorganic non-metal material and a polymer material; and / or at least part of the support structure has a melting point greater than 300°C.

4. The battery cell according to claim 1, characterized in that: A projection of the support structure on the first wall is located on an outer peripheral side of the exhaust valve.

5. The battery cell according to claim 4, characterized in that: In the length direction of the first wall, the exhaust valve is located in the middle of the first wall, and the projection of the supporting structure on the first wall is located on two opposite sides of the exhaust valve along the length direction of the first wall.

6. The battery cell according to claim 4, characterized in that: At least a portion of the support structure is adjacent to an edge of the pole group.

7. The battery cell according to claim 4, characterized in that: At least a portion of the support structure is adjacent to the exhaust valve.

8. The battery cell according to claim 1, characterized in that: The support structure includes a plurality of sub-support structures that are spaced apart from each other, and at least some of the sub-support structures are spaced apart from each other in a direction from the edge of the pole group to the exhaust valve.

9. The battery cell according to claim 8, characterized in that: Part of the sub-support structure is close to the edge of the pole group, and part of the sub-support structure is close to the exhaust valve.

10. The battery cell according to claim 1, characterized in that: The support structure includes a plurality of sub-support structures that are spaced apart from each other, and at least some of the sub-support structures are spaced apart from each other in a circumferential direction of the exhaust valve.

11. The battery cell according to claim 1, characterized in that: The support structure includes a support main structure and a weak structure, wherein the weak structure is arranged on the support main structure, the melting point of the support main structure is greater than the melting point of the insulating layer, and the melting point of the weak structure is less than the melting point of the support main structure. After the weak structure melts, an auxiliary channel connected to the exhaust channel is formed at the position of the weak structure on the support structure, and the auxiliary channel penetrates the support structure in the direction from the edge of the pole group to the exhaust valve.

12. The battery cell according to claim 11, characterized in that: The supporting main structure includes a plurality of sub-support structures that are spaced apart from each other, and the weak structure is located between adjacent sub-support structures or the weak structure is embedded in the sub-support structure.

13. The battery cell according to claim 11, characterized in that: The melting point of the weak structure is not greater than the melting point of the insulating layer.

14. The battery cell according to claim 11, characterized in that: The material of the weak structure is plastic.

15. The battery cell according to claim 1, characterized in that: At least part of the structure of the support structure is made of a thermally expandable material.

16. The battery cell according to claim 15, characterized in that: When the support structure undergoes thermal expansion, a concavo-convex structure is formed on the surface of the support structure facing the pole group.

17. The battery cell according to claim 1, characterized in that: The support structure is a porous structure, and at least part of the pores in the support structure penetrate the support structure in a direction from the edge of the pole group to the exhaust valve.

18. The battery cell according to claim 1, characterized in that: The shell includes a main shell and a cover body, the cover body is covered on the open side of the main shell, the cover body includes the first wall, the first wall is provided with a pole, the battery cell includes a adapter plate, the adapter plate is provided on the side of the pole group adjacent to the first wall, and the adapter plate is used to electrically connect the pole group and the pole.

19. The battery cell according to claim 18, characterized in that: The supporting structure is fixed to the adapter plate.

20. The battery cell according to claim 19, characterized in that: The supporting structure is located on a side of the adapter plate adjacent to the pole group.

21. The battery cell according to claim 20, characterized in that: An insulating sheet is provided between the support structure and the pole group.

22. The battery cell according to claim 20, characterized in that: A pole ear is provided on the side of the pole group facing the first wall, the adapter electrically connects the pole ear and the pole column, the support structure is located on the outer peripheral side of the pole ear, and the projection of the support structure on the first wall and the projection of the pole ear on the first wall are both located on the outer peripheral side of the exhaust valve.

23. The battery cell according to claim 22, characterized in that: The spacing between the support structure and the tab is not less than 2 mm.

24. The battery cell according to claim 22, characterized in that: At least a portion of the support structure is located on a side of the pole ear away from the exhaust valve.

25. The battery cell according to claim 24, characterized in that: The support structure includes a plurality of sub-support structures arranged at intervals, some of the sub-support structures are located on a side of the pole lug away from the exhaust valve, and some of the sub-support structures are located on a side of the pole lug close to the exhaust valve.

26. The battery cell according to claim 20, characterized in that: A receiving groove is formed on one side of the insulating layer facing the adapter plate, and the adapter plate is received in the receiving groove.

27. The battery cell according to claim 26, characterized in that: The distance between the outer peripheral wall of the adapter plate and the inner peripheral wall of the accommodating groove ranges from 0 to 5 mm.

28. The battery cell according to claim 19, characterized in that: At least a portion of the support structure is integrally formed with the adapter sheet.

29. The battery cell according to claim 19, characterized in that: The battery cell includes two poles with opposite polarities, both poles are arranged on the first wall, the exhaust valve is located between the two poles, there are two adapter plates, the two adapter plates correspond to the two poles respectively, and the supporting structure is fixed on each adapter plate.

30. The battery cell according to any one of claims 1 to 29, characterized in that: In the direction from the pole group to the first wall, the size of the support structure is H, the size of the pole group is C, and the size H of the support structure and the size C of the pole group satisfy: 0.007≤H / C≤0.

1.

31. A battery, characterized in that: include: A battery cell according to any one of claims 1 to 30.

32. An electrical equipment, characterized in that: include: A battery according to claim 31.

Images