Battery cell, battery, electric device, and support

Abstract

The present application discloses a battery cell, a battery, an electric device, and a support. The battery cell comprises: a case, provided with an explosion-proof valve; an electrode assembly, provided in the case; and a support, comprising a support body and a first abutting portion, wherein the support body has a first side and a second side opposite to each other, the support body is provided with air vents, and the air vents are configured to be opposite to the explosion-proof valve. The first abutting portion is provided on the first side and configured to abut against an end of the electrode assembly, so that a first air discharge channel is formed between the air vents and the end of the electrode assembly. In the technical solution of the embodiments of the present application, the air discharge capability is improved, the risk of combustion explosion of the battery cell is reduced, the impact on adjacent battery cells is reduced, and the usage reliability and stability of the battery are improved.

Description

Battery cells, batteries, electrical devices, and brackets

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202322215823.3 and application date of August 17, 2023, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery cell, a battery, an electrical device, and a bracket. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this sustainable development. Battery technology is a crucial factor in the development of electric vehicles. However, the reliability of battery cells remains a challenge, hindering further improvements in battery reliability.

[0005] Application Contents

[0006] In view of the above problems, the present application provides a battery cell, a battery and an electrical device with higher reliability, which is conducive to improving the reliability and stability of the battery.

[0007] In the first aspect, the present application provides a battery cell, comprising: a shell, an electrode assembly and a bracket, the shell being provided with an explosion-proof valve; the electrode assembly being arranged on the shell; the bracket comprising a frame body and a first abutting portion, the frame body having a first side and a second side arranged opposite to each other in a thickness direction thereof, the frame body being provided with an exhaust hole passing through the first side and the second side, the exhaust hole being used to be opposite to the explosion-proof valve; the first abutting portion being arranged on the first side and protruding in a direction away from the second side, and being used to abut against an end portion of the electrode assembly, so that a first exhaust channel is formed between the exhaust hole and the end portion of the electrode assembly.

[0008] In the technical solution of the embodiment of the present application, a first abutting portion is provided on the first side of the frame body, and the first abutting portion abuts against the end of the electrode assembly, so that the distance between the first side of the frame body and the end of the electrode assembly can be increased, that is, the distance between the exhaust hole and the end of the electrode assembly is increased, so that a first exhaust channel connected to the exhaust hole is defined between the first side of the frame body and the end of the electrode assembly, thereby improving the exhaust capacity. When the battery cell tends to have thermal runaway, the generated gas can first enter the first exhaust channel, then pass through the bracket from the exhaust hole, and finally be discharged from the explosion-proof valve to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell, reducing the impact on adjacent battery cells, and helping to improve the reliability and stability of the battery.

[0009] In some embodiments, a gas notch is provided on the circumference of the bracket, passing through the first side and the second side. The gas notch and the shell together form a gas channel, and the gas channel is connected to the first exhaust channel. In the above technical solution, by providing a gas notch on the bracket, the gas notch and the shell can be used to define a gas channel. On the one hand, the gas generated in the circumference of the electrode assembly can move to the explosion-proof valve position through the gas channel at the corresponding position in a short time, so as to improve the timeliness of the pressure relief of the explosion-proof valve. At the same time, the gas in the first exhaust channel can flow to the exhaust hole and the gas channel respectively in a short time, achieving instantaneous pressure relief, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell, and improving the reliability and stability of the battery. On the other hand, during liquid injection, the electrolyte can flow toward the electrode assembly through the gas notch, which can shorten the infiltration time and improve the infiltration efficiency.

[0010] In some embodiments, the bracket is provided with a plurality of spaced-apart gas passageways around its circumference. Each gas passageway forms a gas passageway with the housing, and the plurality of gas passageways are arranged around the circumference of the first exhaust passageway. The provision of the plurality of gas passageways defines a plurality of gas passageways, allowing a portion of the gas within the first exhaust passageway to diffuse in all directions, pass through the bracket through the plurality of gas passageways, and ultimately be discharged through the explosion-proof valve. This significantly reduces the risk of combustion and explosion of the battery cells and significantly improves the reliability and stability of the battery. During injection, the electrolyte can flow toward the electrode assembly through the plurality of gas passageways, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0011] In some embodiments, a first extension is further provided on the first side of the frame body. The first extension is disposed circumferentially around the frame body and defines a mating groove with the frame body, with the end of the electrode assembly disposed within the mating groove. In the above technical solution, the provision of the first extension can constrain one end of the electrode assembly, improving the stability of the electrode assembly during shaking of the battery cell, reducing the likelihood of the outer layer of the active material coating of the electrode assembly becoming fluffy, and protecting one end of the electrode assembly, reducing the risk of one end of the electrode assembly contacting the housing. This reduces the risk of the housing scratching the electrode assembly and improves the reliability of the battery cell.

[0012] In some embodiments, a gas passageway is provided through the first extension portion and the frame body. The formed gas passageway runs through both sides of the thickness of the frame to connect the first exhaust passageway and the explosion-proof valve. Gas in the first exhaust passageway can flow to the exhaust hole and the gas passageway respectively in a short period of time, achieving instantaneous pressure relief, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery.

[0013] In some embodiments, the first extension portion and the first abutment portion are spaced apart to form a first guide channel, which connects at least one gas passageway and the first exhaust passageway. The first guide channel can increase the space occupied by the exhaust path, thereby improving exhaust capacity. It can also guide gas entering the first exhaust passageway along the first guide channel to the gas passageway. The gas then passes through the support via the gas passageway and is ultimately discharged from the explosion-proof valve to relieve pressure, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery. Furthermore, the first guide channel can guide the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0014] In some embodiments, there are multiple gas notches on both sides of the exhaust hole along the length of the battery cell, and the multiple gas notches on the same side of the exhaust hole share a common first guide channel. In the above technical solution, the gas entering the first exhaust channel can flow to both sides of the exhaust hole in the length direction of the battery cell under the guidance of the two first guide channels, achieving instantaneous pressure relief, and then pass through the bracket from the multiple gas notches, and finally be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell and improving the reliability and stability of the battery. During liquid injection, the electrolyte can flow under the guidance of the two first guide channels, shortening the infiltration time and improving the infiltration efficiency.

[0015] In some embodiments, the first abutting portion is arranged in an arc shape, and there are two of them, one on each side of the exhaust hole, and the multiple air-passing notches on the same side of the exhaust hole are arranged at circumferential intervals around the corresponding first abutting portion. In the above technical solution, the first abutting portion is arranged in an arc shape. On the one hand, it can reduce the probability of pressure loss of the bracket to the end of the electrode assembly. On the other hand, it can define a first guide channel arranged in an arc shape with the first extension portion, increase the occupied space of the first guide channel, make the multiple air-passing notches on the same side of the exhaust hole connected to the first guide channel, improve the space utilization of the bracket, and further improve the exhaust capacity. In addition, the infiltration time can be further shortened and the infiltration efficiency can be improved.

[0016] In some embodiments, a positive electrode column and a negative electrode column are further provided on the wall of the shell on which the explosion-proof valve is provided, two through holes are opened on the frame body to expose the positive electrode column and the negative electrode column, and the exhaust hole is located between the two through holes; two first abutting portions and the two through holes are provided in a one-to-one correspondence, and each first abutting portion is provided around the outer circumference of the corresponding through hole. In the above technical solution, by providing two through holes on the frame body, the positive electrode column and the negative electrode column can be avoided, so that the positive electrode column and the negative electrode column can be connected to the corresponding conductive portion of the electrode assembly. By providing the first abutting portion around the outer circumference of the corresponding through hole, on the one hand, the first abutting portion and the first extension portion can define a first guide channel arranged in an arc shape, increasing the occupied space of the first guide channel, improving the space utilization rate of the bracket, and at the same time improving the exhaust capacity. On the other hand, the first abutting portion can guide the gas at the through hole to flow toward the first exhaust channel, so that this part of the gas can pass through the bracket from the exhaust hole as much as possible, further improving the exhaust capacity.

[0017] In some embodiments, a second abutment portion is provided on the second side of the frame body, projecting away from the first side. The second abutment portion is configured to abut against a wall of the housing on which the explosion-proof valve is provided, and together they form a second exhaust passage; the second exhaust passage is connected to at least one gas passage. In the above technical solution, by providing the second abutment portion on the second side of the frame body, the second abutment portion abuts against the wall of the housing on which the explosion-proof valve is provided, thereby defining a second exhaust passage connected to the gas passage between the second side of the frame body and the wall of the housing. This increases the space occupied by the exhaust path, improves the exhaust capacity, reduces the risk of combustion and explosion of battery cells, and reduces the impact on adjacent battery cells, thereby facilitating improved reliability and stability of the battery.

[0018] In some embodiments, a second extension is further provided on the second side of the bracket body. The second extension and the second abutment are spaced apart to form a second guide channel. The second guide channel connects at least one of the gas passage and the second exhaust channel. The second guide channel can increase the space occupied by the exhaust path, thereby improving exhaust capacity. It can also serve as a guide. A portion of the gas that passes through the bracket from the gas passage can flow along the second guide channel to the second exhaust channel and ultimately be discharged from the explosion-proof valve to achieve pressure relief, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery. Furthermore, the second guide channel can guide the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0019] In some embodiments, multiple gas-passing notches are provided on either side of the exhaust hole along the length of the battery cell, and multiple gas-passing notches on the same side share a single second guide channel. In this technical solution, gas passing through the bracket can be guided by the second guide channel toward the central second exhaust channel, ultimately being discharged through the explosion-proof valve for final pressure relief, further reducing the risk of combustion and explosion in the battery cell and improving the reliability and stability of the battery. The electrolyte can flow toward the multiple gas-passing notches under the guidance of the second guide channel, shortening the infiltration time and improving the infiltration efficiency.

[0020] In some embodiments, the second side includes a mounting recessed portion recessed toward the first side. A second exhaust passage is defined between the mounting recess and the wall of the housing housing housing the explosion-proof valve, and the exhaust hole is provided in the bottom wall of the mounting recess. In the above technical solution, providing the mounting recess on the second side of the frame body increases the distance between the wall of the housing housing housing the explosion-proof valve and the exhaust hole, thereby increasing the space occupied by the exhaust path and improving exhaust capacity, further reducing the risk of combustion and explosion of battery cells and minimizing the impact on adjacent battery cells, thereby improving the reliability and stability of the battery.

[0021] In some embodiments, the sidewalls of the mounting recess are provided with air holes that connect the second guide channel and the second exhaust channel. Gas within the second guide channel can flow through the air holes to the second exhaust channel and ultimately be discharged through the explosion-proof valve to relieve pressure, reducing the risk of combustion and explosion of the battery cells and minimizing the impact on adjacent battery cells, thereby improving the reliability and stability of the battery.

[0022] In some embodiments, the second abutting portion is arc-shaped and is provided in two numbers, one on either side of the exhaust hole. Multiple air-passing notches located on the same side of the exhaust hole are spaced circumferentially around the corresponding second abutting portion. In the above technical solution, the arc-shaped second abutting portion and the circumferentially spaced multiple air-passing notches located on the same side of the exhaust hole define a second, arc-shaped flow channel, increasing the space occupied by the second flow channel, improving the space utilization of the stent, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, improving the infiltration efficiency.

[0023] In some embodiments, a positive electrode column and a negative electrode column are further provided on the wall of the shell on which the explosion-proof valve is provided, and two through holes are provided on the frame body to expose the positive electrode column and the negative electrode column, and the exhaust hole is located between the two through holes; the two second abutting portions and the two through holes are provided in a one-to-one correspondence, and each second abutting portion is provided around the outer circumference of the corresponding through hole. In the above technical solution, by providing two through holes on the frame body, the positive electrode column and the negative electrode column can be avoided, so that the positive electrode column and the negative electrode column can be connected to the corresponding conductive portion of the electrode assembly, and by providing the second abutting portion around the outer circumference of the corresponding through hole, on the one hand, the second abutting portion and the second extension portion can define a second guide channel provided in an arc shape, thereby increasing the occupied space of the second guide channel, improving the space utilization rate of the bracket, and at the same time improving the exhaust capacity, and on the other hand, reducing the backflow of gas from the through hole.

[0024] In some embodiments, the through-hole wall is provided with a positioning groove for engaging with the positive or negative electrode post. The provision of the positioning groove helps to improve the connection reliability between the positive or negative electrode post and the bracket. The positioning groove can also accelerate the flow of the electrolyte, shorten the infiltration time, and improve the infiltration efficiency.

[0025] In some embodiments, the electrode assemblies include at least two, at least two of which are stacked, and at least one of the gas holes is positioned relative to the center between two adjacent electrode assemblies. In the above technical solution, by positioning the at least one gas hole relative to the center between two adjacent electrode assemblies, gas between the two adjacent electrode assemblies can be rapidly transferred from the first side of the frame body through the gas hole to the second side of the frame body, and then toward the explosion-proof valve, thereby improving the timeliness of the explosion-proof valve's pressure relief and enhancing the reliability and stability of the battery.

[0026] In some embodiments, a pole is further provided on the wall of the shell on which the explosion-proof valve is provided. The pole is at least one of a positive pole and a negative pole. A through hole is provided on the frame body to expose the pole, and a receiving portion is provided on the pole to communicate with the through hole. The electrode assembly includes an active material coating portion and a conductive portion connected to the active material coating portion. The bracket is supported on the end of the active material coating portion where the conductive portion is provided. At least a portion of the conductive portion extends through the through hole and then extends into the receiving portion to connect with the pole. Since the pole is provided with a receiving portion, the hollow structure of the receiving portion can, on the one hand, reduce the weight of the pole to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, the conductive portion can be accommodated in the receiving portion, thereby improving the assembly efficiency of the conductive portion and saving the space occupied by the conductive portion. The space of the battery cell is fully utilized, so that the fit between the bracket and the pole, and between the bracket and the conductive portion are tighter and more reliable, making the structure of the battery cell more compact and more conducive to improving the energy density of the battery cell.

[0027] In some embodiments, the accommodating portion includes a first accommodating groove, the surface of the pole facing the active material coating portion is the inner end face of the pole, the notch of the first accommodating groove is formed on the inner end face of the pole, and at least a portion of the conductive portion is accommodated in the first accommodating groove. In the above technical solution, on the one hand, the opening of the first accommodating groove on the pole can reduce the weight of the pole to a certain extent, so as to improve the weight energy density of the battery cell and the battery; on the other hand, because the notch of the first accommodating groove is formed on the inner end face of the pole, and the inner end face of the pole is the surface of the pole close to the active material coating portion, the first accommodating groove can be opened in the direction of the active material coating portion, thereby facilitating the conductive portion to extend into the first accommodating groove, thereby improving assembly efficiency. Moreover, this form of first accommodating groove is easy to process and improves production efficiency.

[0028] In some embodiments, the receiving portion includes a second receiving groove, wherein the surface of the terminal distal to the active material coating portion is the terminal outer end surface, and a notch of the second receiving groove is formed on the terminal outer end surface. The second receiving groove communicates with the interior of the housing via a through-hole, and the conductive portion is passed through the through-hole and at least partially received within the second receiving groove. In the above technical solution, on the one hand, the provision of the second receiving groove on the terminal can reduce the weight of the terminal to a certain extent, thereby improving the weight energy density of the battery cell and the battery. On the other hand, because the notch of the second receiving groove is formed on the terminal outer end surface, which is the surface of the terminal distal to the active material coating portion, the second receiving groove can be open in a direction away from the active material coating portion. Thus, when at least a portion of the conductive portion is received within the second receiving groove, the conductive portion can be easily stored and organized through the notch of the second receiving groove, and electrical connection operations between the conductive portion and the terminal can be easily performed through the notch of the second receiving groove, thereby reducing the difficulty of battery cell production and improving battery cell production efficiency.

[0029] In some embodiments, the electrode assembly includes two electrodes, one positive electrode and one negative electrode, and two through-holes, each exposing the positive electrode and the other negative electrode. During assembly of the electrode assembly into the housing, the two conductive portions of the electrode assembly can simultaneously and separately pass through the two through-holes of the bracket, facilitating connection between the two conductive portions and the positive electrode and the negative electrode, respectively, thereby improving production efficiency.

[0030] In some embodiments, the battery cell further includes an insulating member connected to the bracket and wrapped around the circumference of the electrode assembly. The insulating member can be used to isolate the electrical connection components in the housing from the housing to reduce the risk of short circuit.

[0031] In a second aspect, the present application provides a battery comprising the battery cell in the above embodiment.

[0032] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cells, the risk of combustion and explosion of the battery cells can be reduced, the impact on adjacent battery cells can be reduced, and the reliability and stability of the battery can be improved.

[0033] In a third aspect, the present application provides an electrical device, which includes the battery cell in the above embodiment; or, it includes the battery in the above embodiment.

[0034] In the technical solution of the embodiment of the present application, the use of the above-mentioned battery is beneficial to improving the reliability and stability of the electrical device.

[0035] In a fourth aspect, the present application provides a bracket for a battery cell, the battery cell comprising a shell and an electrode assembly arranged in the shell, the shell being provided with an explosion-proof valve, the bracket comprising: a bracket body having a first side and a second side arranged opposite to each other in a thickness direction thereof, the bracket body being provided with an exhaust hole passing through the first side and the second side, the exhaust hole being used to be opposite to the explosion-proof valve; a first abutting portion being provided on the first side and protruding in a direction away from the second side, for abutting against an end portion of the electrode assembly, so that the exhaust hole is spaced apart from the end portion of the electrode assembly and together form a first exhaust channel.

[0036] In the technical solution of the embodiment of the present application, a first abutting portion is provided on the first side of the frame body, and the first abutting portion abuts against the end of the electrode assembly, so that the distance between the first side of the frame body and the end of the electrode assembly can be increased, that is, the distance between the exhaust hole and the end of the electrode assembly is increased, so that a first exhaust channel connected to the exhaust hole is defined between the first side of the frame body and the end of the electrode assembly, thereby improving the exhaust capacity. When the battery cell tends to have thermal runaway, the generated gas can first enter the first exhaust channel, then pass through the bracket from the exhaust hole, and finally be discharged from the explosion-proof valve to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell, reducing the impact on adjacent battery cells, and helping to improve the reliability and stability of the battery.

[0037] In some embodiments, a circumferential gas notch extending through the first side and the second side of the bracket is provided. The gas notch is used to form a gas passage with the shell to connect the gas passage with the first exhaust passage. By providing the gas notch on the bracket, the gas notch and the shell can be used to define a gas passage. On the one hand, the gas generated circumferentially by the electrode assembly can move toward the explosion-proof valve position through the gas passage at the corresponding position in a short period of time, thereby improving the timeliness of the pressure relief of the explosion-proof valve. At the same time, the gas in the first exhaust passage can flow to the exhaust hole and the gas passage respectively in a short period of time, thereby achieving instantaneous pressure relief. Finally, the gas can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell and improving the reliability and stability of the battery. On the other hand, during injection, the electrolyte can flow toward the electrode assembly through the gas notch, thereby shortening the infiltration time and improving the infiltration efficiency.

[0038] In some embodiments, a first extension is further provided on the first side of the frame body. The first extension is disposed circumferentially around the frame body and defines a mating groove with the frame body for mating with the end of the electrode assembly. In this technical solution, the provision of the first extension constrains one end of the electrode assembly, reducing the likelihood of the outer layer of the active material coating of the electrode assembly becoming fluffy. It also protects the one end of the electrode assembly, reducing the risk of the one end of the electrode assembly contacting the housing, thereby reducing the possibility of the housing scratching the electrode assembly and improving the reliability of the battery cell.

[0039] In some embodiments, the first extension portion and the first abutting portion are spaced apart to form a first guide channel, and the first guide channel is used to connect at least one air passage and the first exhaust channel.

[0040] The first guide channel not only increases the space occupied by the exhaust path, improving exhaust capacity, but also serves as a guide, allowing some of the gas entering the first exhaust channel to flow along the first guide channel to the gas passage. The gas then passes through the gas passage, through the bracket, and ultimately out of the explosion-proof valve to relieve pressure, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery. Furthermore, the first guide channel guides the flow of electrolyte, further shortening the infiltration time and significantly improving infiltration efficiency.

[0041] In some embodiments, there are multiple gas notches on both sides of the exhaust hole along the length of the bracket, and the multiple gas notches on the same side share a first guide channel. In the above technical solution, the gas entering the first exhaust channel can flow to both sides of the exhaust hole in the length direction of the battery cell under the guidance of the two first guide channels, achieving instantaneous pressure relief, and then pass through the bracket from the multiple gas notches, and finally can be discharged from the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell and improving the reliability and stability of the battery. During liquid injection, the electrolyte can flow under the guidance of the two first guide channels, shortening the infiltration time and improving the infiltration efficiency.

[0042] In some embodiments, the first abutment is arc-shaped and is provided in two portions, one on each side of the exhaust hole. Multiple air-passing notches located on the same side of the exhaust hole are circumferentially spaced around the corresponding first abutment. In the above technical solution, the arc-shaped first abutment and the circumferentially spaced multiple air-passing notches located on the same side of the exhaust hole define an arc-shaped first flow guide channel, increasing the space occupied by the first flow guide channel, improving the space utilization of the stent, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, improving the infiltration efficiency.

[0043] In some embodiments, the frame body has two through-holes for exposing the positive and negative electrodes of the battery cells; the exhaust hole is located between the two through-holes, and the two first abutting portions are arranged in a one-to-one correspondence with the two through-holes, and each first abutting portion is arranged around the outer circumference of the corresponding through-hole. In the above technical solution, the first abutting portion can, on the one hand, define a first guide channel arranged in an arc shape with the first extension portion, thereby increasing the occupied space of the first guide channel, improving the space utilization of the frame, and improving the exhaust capacity. On the other hand, the first abutting portion is arranged around the through-hole, which can guide the gas at the through-hole to flow toward the first exhaust channel, so that this part of the gas can pass through the frame from the exhaust hole as much as possible, further improving the exhaust capacity.

[0044] In some embodiments, the bracket further comprises: a second abutting portion, disposed on the second side and protruding in a direction away from the first side, for abutting against the wall of the housing on which the explosion-proof valve is provided, with the exhaust hole and the wall together forming a second exhaust passage; the second exhaust passage is connected to at least one air passage. In the above technical solution, by disposing the second abutting portion on the second side of the bracket body, the second abutting portion abuts against the wall of the housing on which the explosion-proof valve is provided, thereby defining a second exhaust passage connected to the air passage between the second side of the bracket body and the wall of the housing, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, reducing the risk of combustion and explosion of the battery cells, and reducing the impact on adjacent battery cells, which is conducive to improving the reliability and stability of the battery.

[0045] In some embodiments, a second extension portion is further provided protruding from the second side of the bracket body. The second extension portion and the second abutment portion are spaced apart to form a second guide channel. The second guide channel is used to connect at least one gas passageway and a second exhaust passageway. The second guide channel can increase the space occupied by the exhaust path, thereby improving exhaust capacity. It can also serve as a guide. A portion of the gas that passes through the bracket from the gas passageway can flow along the second guide channel to the second exhaust passageway and ultimately be discharged from the explosion-proof valve to achieve pressure relief, further reducing the risk of combustion and explosion of the battery cells and improving the reliability and stability of the battery. Furthermore, the second guide channel can guide the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0046] In some embodiments, multiple gas-passing notches are provided on either side of the exhaust hole along the length of the bracket, and multiple gas-passing notches on the same side share a single second flow channel. In this technical solution, gas passing through the bracket can be guided by the second flow channel toward the second exhaust channel, ultimately being discharged through the explosion-proof valve for final pressure relief, further reducing the risk of combustion and explosion in the battery cells and improving the reliability and stability of the battery. The electrolyte can be guided by the second flow channel toward the multiple gas-passing notches, shortening the infiltration time and improving the infiltration efficiency.

[0047] In some embodiments, the second abutment is arc-shaped and is provided in two portions, one on either side of the exhaust hole. Multiple air-passing notches located on the same side of the exhaust hole are spaced circumferentially around the second abutment. In the above technical solution, the arc-shaped second abutment and the circumferential spacing of the multiple air-passing notches located on the same side of the exhaust hole define an arc-shaped second flow guide channel, increasing the space occupied by the second flow guide channel, improving the space utilization of the stent, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, improving the infiltration efficiency.

[0048] In some embodiments, the wall of the shell on which the explosion-proof valve is mounted is further provided with a positive electrode column and a negative electrode column, and two through-holes are provided on the frame body to expose the positive electrode column and the negative electrode column, with the exhaust hole located between the two through-holes; the two second abutting portions are provided in a one-to-one correspondence with the two through-holes, and each second abutting portion is provided around the outer circumference of the corresponding through-hole. In the above technical solution, the second abutting portion can, on the one hand, define a second flow guide channel arranged in an arc shape with the second extension portion, thereby increasing the space occupied by the second flow guide channel, improving the space utilization rate of the bracket, and at the same time improving the exhaust capacity. On the other hand, the second abutting portion is provided around the through-hole to reduce the backflow of gas from the through-hole.

[0049] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0051] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0052] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0053] FIG3 is a perspective view of a battery cell provided in some embodiments of the present application;

[0054] FIG4 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0055] FIG5 is a cross-sectional view of a battery cell according to some embodiments of the present application;

[0056] FIG6 is a partial enlarged view of the battery cell shown in FIG5 ;

[0057] FIG7 is an assembly diagram of an electrode assembly and a bracket of a battery cell provided in some embodiments of the present application;

[0058] FIG8 is a schematic structural diagram of a battery cell bracket provided in some embodiments of the present application from a viewing angle;

[0059] FIG9 is a partial enlarged view of the bracket shown in FIG8;

[0060] FIG10 is a schematic structural diagram of a battery cell bracket provided in some embodiments of the present application from another perspective;

[0061] FIG11 is a partial enlarged view of the bracket shown in FIG10;

[0062] FIG12 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG13 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0064] FIG14 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0065] FIG15 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0066] FIG16 is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of the present application;

[0067] FIG17 is a schematic partial cross-sectional view of a battery cell provided in some embodiments of the present application.

[0068] The accompanying drawings in the specific implementation manner are as follows:

[0069] Electric device 1000, battery 100, controller 200, motor 300,

[0070] The first direction Z, the second direction X, the third direction Y, the axial direction R of the pole,

[0071] Battery cell 10,

[0072] Box 20, first part 201, second part 202,

[0073] Shell 11, shell body 111, opening 1110, shell cover 112, mounting hole 113, pole 12, positive pole 1201, negative pole 1202, accommodating portion 121, first accommodating groove 12110, first end wall 12111, first recessed groove 12112, first side wall 12113, second accommodating groove 12120, second end wall 12121, second recessed groove 12122, second side wall 12123, through-hole 12130, pole inner end surface 122, pole outer end surface 123, first groove 126, spacer 127, cover plate 13; first conductive member 131; second groove 1311; second conductive member 132;

[0074] Electrode assembly 2, active material coating portion 21, conductive portion 22,

[0075] Bracket 3, matching groove 30, air passage 301, first exhaust passage 302, second exhaust passage 303, first guide passage 304, second guide passage 305, frame body 31, first side 311, second side 312, exhaust hole 313, through hole 314, air notch 315, mounting recess 316, air hole 317, positioning groove 318, weight reduction groove 319, first abutting portion 321, second abutting portion 322, first extension portion 331, second extension portion 332,

[0076] Insulation part 4, explosion-proof valve 6, slot cover 7. DETAILED DESCRIPTION

[0077] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0078] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0079] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0080] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0081] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0082] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0083] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0084] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0085] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0086] In related battery cells, an explosion-proof disc is located at the center of the lower plastic component. Below the disc is a recessed cavity, facing the electrode assembly. The bottom surface of the cavity features multiple grid holes, allowing the disc to directly connect to the battery's internal space, allowing it to sensitively sense the pressure within the battery. However, the proximity of the grid holes to the electrode assembly slows exhaust flow, impacting exhaust capacity and severely affecting the reliability of the battery cell.

[0087] In order to improve the reliability of the battery cell, the present application provides a first abutment portion on the side of the frame body facing the electrode assembly, so that a first exhaust channel connected to the exhaust hole is defined between the exhaust hole and the end of the electrode assembly, thereby improving the exhaust capacity, reducing the risk of combustion and explosion of the battery cell, reducing the impact on adjacent battery cells, and helping to improve the reliability and stability of the battery.

[0088] The battery cells disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. Electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, among others.

[0089] For the convenience of description, the following embodiments are described by taking an electric device 1000 according to an embodiment of the present application as a vehicle as an example.

[0090] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle, and the battery 100 can be provided at the bottom, head or tail of the vehicle. The battery 100 can be used to power the vehicle. For example, the battery 100 can be used as an operating power source for the vehicle. The vehicle can also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0091] In some embodiments of the present application, the battery 100 can serve not only as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0092] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a housing 20 and a battery cell 10, with the battery cell 10 being housed within the housing 20. The housing 20 is used to provide a storage space for the battery cell 10, and the housing 20 can adopt a variety of structures. In some embodiments, the housing 20 can include a first portion 201 and a second portion 202, which cover each other and together define a storage space for accommodating the battery cell 10. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 covering the open side of the second portion 202, so that the first portion 201 and the second portion 202 jointly define a storage space. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 covering the open side of the second portion 202. Of course, the box body 20 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0093] In the battery 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 100 may be housed within the housing 20. Of course, the battery 100 may also be in the form of a battery module 100, in which multiple battery cells 10 are first connected in series, in parallel, or in a hybrid connection, and then the multiple battery modules 100 are further connected in series, in parallel, or in a hybrid connection to form an entire battery 100, and then housed within the housing 20. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0094] Each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0095] Please refer to Figures 3 and 4. Figure 3 is a schematic diagram of the decomposed structure of the battery cell 10 provided in some embodiments of the present application. Figure 4 is a structural sectional view of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 refers to the smallest unit that constitutes the battery 100. The battery cell 10 includes a shell 11, an electrode assembly 2 and a bracket 3. As shown in Figures 3 and 4, an explosion-proof valve 6 may be provided on the shell 11, and the explosion-proof valve 6 is used to release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. Among them, the shell 11 may include a shell body 111 and a shell cover 112. The explosion-proof valve 6 can be provided on the shell cover 112 or on the shell body 111.

[0096] The shell cover 112 refers to a component that covers the opening 1110 of the shell body 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the shell cover 112 can be adapted to the shape of the shell body 111 to match the shell body 111. Optionally, the shell cover 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the shell cover 112 is not easily deformed when squeezed or collided, so that the battery cell 10 can have a higher structural strength and the reliability can also be improved. Functional components such as electrode terminals can be provided on the shell cover 112. The electrode terminal can be used to electrically connect to the electrode assembly 2 for outputting or inputting electrical energy of the battery cell 10. The material of the shell cover 112 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0097] The shell body 111 is a component used to cooperate with the shell cover 112 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 2, electrolyte, and other components. The shell body 111 and the shell cover 112 can be independent components. An opening 1110 can be provided on the shell body 111, and the shell cover 112 covers the opening 1110 to form the internal environment of the battery cell 10. Without limitation, the shell cover 112 and the shell body 111 can also be integrated. Specifically, the shell cover 112 and the shell body 111 can form a common connection surface before other components are inserted into the shell. When the interior of the shell body 111 needs to be encapsulated, the shell cover 112 is then closed by the shell body 111. The shell body 111 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell body 111 can be determined according to the specific shape and size of the electrode assembly 2. The shell 111 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0098] The electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 2 may be contained in the housing 11. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 2, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0099] Please refer to Figure 4, and further refer to Figures 5 and 6. Figure 5 is a structural cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Figure 6 is a partial enlarged view of the battery cell 10 shown in Figure 5. The bracket 3 includes a frame body 31, and the frame body 31 has a first side 311 and a second side 312. The first side 311 and the second side 312 are arranged opposite to each other in the thickness direction of the frame body 31 (Z direction as shown in Figure 6). The frame body 31 is provided with an exhaust hole 313, which passes through the first side 311 and the second side 312 of the frame body 31. The exhaust hole 313 is used to be opposite to the explosion-proof valve 6.

[0100] The bracket 3 also includes a first abutment portion 321, which is arranged on the first side 311 of the bracket body 31, and the first abutment portion 321 protrudes in the direction away from the second side 312 of the bracket body 31. The first abutment portion 321 is used to abut with the end of the electrode assembly 2 so that a first exhaust channel 302 is formed between the exhaust hole 313 and the end of the electrode assembly 2.

[0101] Among them, "the first abutting portion 321 abuts against the end of the electrode assembly 2" means that the first abutting portion 321 contacts and cooperates with the end of the electrode assembly 2. When the bracket 3 is located above the electrode assembly 2, the end of the electrode assembly 2 can support the bracket 3. When the bracket 3 is located below the electrode assembly 2, the bracket 3 can support the electrode assembly 2.

[0102] The first abutting portion 321 is arranged on the first side 311 of the frame body 31. Specifically, the first abutting portion 321 is arranged on the side of the end of the frame body 31 facing the electrode assembly 2. Since the first abutting portion 321 abuts against the end of the electrode assembly 2, the first side 311 of the frame body 31 is separated from the end of the electrode assembly 2 to define a first exhaust channel 302 between the first side 311 of the frame body 31 and the end of the electrode assembly 2, and the exhaust hole 313 is connected between the first exhaust channel 302 and the explosion-proof valve 6.

[0103] In the technical solution of the embodiment of the present application, a first abutting portion 321 is provided on the first side 311 of the frame body 31, and the first abutting portion 321 abuts against the end of the electrode assembly 2, so that the distance between the first side 311 of the frame body 31 and the end of the electrode assembly 2 can be increased, that is, the distance between the exhaust hole 313 and the end of the electrode assembly 2 is increased, so that a first exhaust channel 302 connected to the exhaust hole 313 is defined between the first side 311 of the frame body 31 and the end of the electrode assembly 2, thereby improving the exhaust capacity. When the battery cell 10 tends to thermal runaway, the generated gas can first enter the first exhaust channel 302, and then pass through the bracket 3 from the exhaust hole 313, and finally be discharged from the explosion-proof valve 6 to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0104] Please refer again to Figures 5 and 6, and further to Figure 7, which is an assembly diagram of the electrode assembly 2 and the bracket 3 of the battery cell 10 provided in some embodiments of the present application. In Figure 7, the Z direction is the first direction, i.e., the height direction of the electrode assembly 2, the X direction is the second direction, i.e., the width direction of the electrode assembly 2, and the Y direction is the third direction, i.e., the thickness direction of the electrode assembly 2. The bracket 3 is disposed at one end of the electrode assembly 2 in the height direction.

[0105] The bracket 3 is provided with an air-passing notch 315 on its circumference. The air-passing notch 315 passes through the first side 311 and the second side 312 of the bracket body 31. The circumference of the bracket 3 cooperates with the shell 11 to form an air passage 301 between the air-passing notch 315 and the shell 11. The air passage 301 is connected to the first exhaust passage 302.

[0106] Among them, the meaning of the notch is a gap formed by a missing piece on the edge of the structure. The air gap 315 in the embodiment of the present application refers to the air gap formed by a missing piece on the circumference of the bracket 3. When the bracket 3 is matched with the shell 11, the shell 11 can close the opening of the air gap 315 to define the air channel 301.

[0107] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas can pass through the bracket 3 through the exhaust hole 313, and the other part of the gas can pass through the bracket 3 through the gas channel 301, and finally be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0108] In the above technical solution, by setting a gas notch 315 on the bracket 3, the gas notch 315 can be used to define a gas channel 301 with the shell 11. On the one hand, the gas generated circumferentially by the electrode assembly 2 can move to the position of the explosion-proof valve 6 through the gas channel 301 at the corresponding position in a short time, so as to improve the timeliness of the pressure relief of the explosion-proof valve 6. At the same time, the gas in the first exhaust channel 302 can flow to the exhaust hole 313 and the gas channel 301 respectively in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. On the other hand, when injecting liquid, the electrolyte can flow toward the electrode assembly 2 through the gas notch 315, which can shorten the infiltration time and improve the infiltration efficiency.

[0109] Please refer to Figure 7 again. A plurality of air gaps 315 are provided around the circumference of the bracket 3, and the plurality of air gaps 315 are arranged at intervals. For example, the plurality of air gaps 315 can be evenly distributed around the circumference of the bracket 3, or the plurality of air gaps 315 can be concentrated at local positions around the circumference of the bracket 3. Each air gap 315 forms an air passage 301 together with the shell 11, and the plurality of air passages 301 are arranged around the circumference of the first exhaust passage 302.

[0110] Therefore, by setting multiple gas holes 315, multiple gas channels 301 can be defined. Part of the gas in the first exhaust channel 302 can diffuse to the surroundings, pass through the bracket 3 from the multiple gas channels 301, and finally be discharged from the explosion-proof valve 6, thereby greatly reducing the risk of combustion and explosion of the battery cell 10 and greatly improving the reliability and stability of the battery 100. During liquid injection, the electrolyte can flow toward the electrode assembly 2 through the multiple gas holes 315, further shortening the infiltration time and greatly improving the infiltration efficiency.

[0111] Please refer again to Figure 7, and further to Figures 8 and 9. Figure 8 is a schematic structural diagram of the bracket 3 of the battery cell 10 provided in some embodiments of the present application, viewed from one perspective. Figure 9 is a partially enlarged view of the bracket 3 shown in Figure 8. A first extension portion 331 is further provided on the first side 311 of the bracket body 31. The first extension portion 331 is disposed circumferentially around the bracket body 31, and the first extension portion 331 and the bracket body 31 define a mating groove 30. The end of the electrode assembly 2 is disposed within the mating groove 30.

[0112] That is, the bracket body 31 is provided at the end of the electrode assembly 2, and the first extension portion 331 is provided on the circumference of the electrode assembly 2. It should be noted that the bracket 3 can be assembled with the electrode assembly 2 and then installed into the housing 11 together. Alternatively, the bracket 3 can be pre-installed on the housing 11, and then the electrode assembly 2 is installed into the housing 11 and matched with the bracket 3.

[0113] In an embodiment in which the bracket 3 and the electrode assembly 2 are assembled and then installed together into the shell 11, during the shell insertion process, the first extension portion 331 can protect the electrode assembly 2, reduce the probability of the electrode assembly 2 touching the shell 11, and further reduce the occurrence of the shell 11 scratching the electrode assembly 2, so as to reduce the possibility of the active material of the electrode assembly 2 falling off, to a certain extent prevent the internal short circuit caused by the overlapping of the fallen active material and the pole piece of opposite polarity, and to a certain extent prevent the fallen active material from chemically reacting with the shell 11, thereby causing the shell 11 to be corroded and penetrated, thereby improving the reliability of the battery cell 10, and the first extension portion 331 and the electrode assembly 2 can be snapped together, to a certain extent prevent the bracket 3 from falling off before entering the shell, thereby improving the product quality rate of the battery cell 10. After entering the shell, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0114] In an embodiment in which the bracket 3 is pre-installed on the shell 11 and the electrode assembly 2 is subsequently installed into the shell 11, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0115] Therefore, in the above technical solution, by setting the first extension portion 331, one end of the electrode assembly 2 can be constrained, thereby improving the stability of the electrode assembly 2 during the shaking of the battery cell 10, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and protecting one end of the electrode assembly 2, thereby reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0116] The gas notch 315 is provided through the first extension portion 331 and the frame body 31. The formed gas passage 301 runs through both sides of the thickness of the frame 3 to connect the first exhaust passage 302 and the explosion-proof valve 6. The gas in the first exhaust passage 302 can quickly flow to the exhaust hole 313 and the gas passage 301, respectively, achieving instantaneous pressure relief. Finally, the gas can be discharged from the explosion-proof valve 6 for final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10 and improving the reliability and stability of the battery 100.

[0117] 9 again, the first extension portion 331 and the first abutting portion 321 are spaced apart and together form a first guide channel 304 , which connects at least one air passage 301 and the first exhaust channel 302 .

[0118] First guide channel 304 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide, allowing some of the gas entering first exhaust channel 302 to flow along first guide channel 304 to gas passage 301. The gas then passes through gas passage 301, through bracket 3, and ultimately out of explosion-proof valve 6 to relieve pressure, further reducing the risk of combustion and explosion of battery cells 10 and improving the reliability and stability of battery 100. Furthermore, first guide channel 304 guides the flow of electrolyte, further shortening the infiltration time and significantly improving infiltration efficiency.

[0119] In the length direction of the battery cell 10 (the X direction as shown in the figure), there are multiple gas holes 315 on both sides of the exhaust hole 313. The multiple gas holes 315 on the same side of the exhaust hole 313 share one first guide channel 304.

[0120] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the first guide channels 304 is two, and the two first guide channels 304 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the first guide channel 304 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air channels 301 at the corresponding positions, and the first guide channel 304 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air channels 301 at the corresponding positions.

[0121] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302. A portion of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31. The other portion of the gas can be diverted through the two first guide channels 304, then pass through the bracket 3 through the multiple gas passages 301 and flow to the second side 312 of the bracket body 31. Finally, it can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0122] In the above technical solution, gas entering the first exhaust channel 302 can flow toward both sides of the exhaust hole 313 along the length of the battery cell 10 under the guidance of the two first guide channels 304, achieving instantaneous pressure relief. The gas then passes through the bracket 3 through the multiple gas passages 301 and is ultimately discharged through the explosion-proof valve 6, achieving final pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. During electrolyte injection, the electrolyte can flow under the guidance of the two first guide channels 304, shortening the infiltration time and improving the infiltration efficiency.

[0123] Please refer to Figures 8 and 9 again. The first abutting portion 321 is arranged in an arc shape, so that the first abutting portion 321 and the first extension portion 331 define an arc-shaped first guide channel 304, and can reduce the contact area between the bracket 3 and the end of the electrode assembly 2, thereby reducing the probability of pressure loss of the bracket 3 on the end of the electrode assembly 2.

[0124] There are two first abutting portions 321 , which are respectively located on both sides of the exhaust hole 313 . For example, the two first abutting portions 321 are formed as arc-shaped plates, with both ends of each arc-shaped plate spaced apart and facing the exhaust hole 313 .

[0125] Among them, multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the corresponding first abutment portion 321, so that the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide channel 304, so that the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide channel 304, so that the multiple air gaps 301 are all connected to the same first guide channel 304, and the gas at the first exhaust channel 302 flows around the first exhaust channel 302 under the guidance of the two first guide channels 304, passes through the bracket 3 through the multiple air gaps 301, and can finally be discharged from the explosion-proof valve 6.

[0126] Therefore, in the above technical solution, the arc-shaped first abutting portion 321 can, on the one hand, reduce the probability of pressure loss on the end of the bracket 3 against the electrode assembly 2. On the other hand, it can define an arc-shaped first guide channel 304 with the first extension portion 331, thereby increasing the space occupied by the first guide channel 304 and allowing the multiple air-passing notches 315 located on the same side of the exhaust hole 313 to communicate with the first guide channel 304. This improves the space utilization of the bracket 3 and further enhances the exhaust capacity. In addition, the infiltration time can be further shortened, thereby improving the infiltration efficiency.

[0127] Referring again to Figures 3-4 and 7-8, the wall of the housing 11 where the explosion-proof valve 6 is located is also provided with a positive electrode post 1201 and a negative electrode post 1202. The frame body 31 has two through-holes 314, with the exhaust hole 313 located between the two through-holes 314. The two through-holes 314 are used to expose the positive electrode post 1201 and the negative electrode post 1202, respectively. The two first abutting portions 321 are provided in a one-to-one correspondence with the two through-holes 314, and each first abutting portion 321 is provided around the outer circumference of the corresponding through-hole 314. In other words, the first abutting portions 321 form an arc-shaped structure that is provided around the outer circumference of the corresponding through-hole 314.

[0128] In the above technical solution, by setting two through holes 314 on the frame body 31, the positive electrode column 1201 and the negative electrode column 1202 can be avoided, so that the positive electrode column 1201 and the negative electrode column 1202 can be connected to the corresponding conductive part 22 of the electrode assembly 2. By setting the first abutment portion 321 around the outer circumference of the corresponding through hole 314, on the one hand, the first abutment portion 321 and the first extension portion 331 can define a first guide channel 304 in an arc shape, increase the occupied space of the first guide channel 304, improve the space utilization rate of the bracket 3, and at the same time improve the exhaust capacity. On the other hand, the first abutment portion 321 can guide the gas at the through hole 314 to flow toward the first exhaust channel 302, so that this part of the gas can pass through the bracket 3 from the exhaust hole 313 as much as possible, further improving the exhaust capacity.

[0129] Please refer to Figure 7 again, and further to Figures 10 and 11. Figure 10 is a schematic structural diagram of the bracket 3 of the battery cell 10 provided in some embodiments of the present application from another perspective. Figure 11 is a partially enlarged view of the bracket 3 shown in Figure 10. A second abutment portion 322 is provided on the second side 312 of the bracket body 31. The second abutment portion 322 is protruded in a direction away from the first side 311. The second abutment portion 322 is used to abut against the wall of the shell 11 where the explosion-proof valve 6 is provided, so that a second exhaust channel 303 is formed between the bracket 3 and the wall of the shell 11. The second exhaust channel 303 is connected to at least one gas passage 301.

[0130] The second abutting portion 322 is arranged on the second side 312 of the frame body 31. Specifically, the second abutting portion 322 is arranged on the side of the end of the frame body 31 away from the electrode assembly 2. Since the second abutting portion 322 abuts against the wall of the shell 11 where the explosion-proof valve 6 is set, the second side 312 of the frame body 31 is separated from the wall of the shell 11 to define a second exhaust channel 303 between the second side 312 of the frame body 31 and the wall of the shell 11.

[0131] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas passes through the bracket 3 from the exhaust hole 313, and the other part of the gas passes through the bracket 3 through the gas channel 301, and finally converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0132] In the above technical solution, a second abutting portion 322 is provided on the second side 312 of the frame body 31, and the second abutting portion 322 abuts against the wall of the shell 11 on which the explosion-proof valve 6 is provided, so that a second exhaust channel 303 connected to the air passage 301 is defined between the second side 312 of the frame body 31 and the wall of the shell 11, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0133] 10 and 11 , a second extension portion 332 is further protruded from the second side 312 of the frame body 31 . The second extension portion 332 is spaced apart from the second abutting portion 322 . The second extension portion 332 and the second abutting portion 322 together form a second guide channel 305 . The second guide channel 305 connects at least one of the air passage 301 and the second exhaust channel 303 .

[0134] The second guide channel 305 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide. A portion of the gas that passes through the bracket 3 from the gas passage 301 can flow along the second guide channel 305 to the second exhaust channel 303, ultimately being discharged through the explosion-proof valve 6 to achieve pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. Furthermore, the second guide channel 305 guides the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0135] In the length direction of the battery cell 10 , there are multiple gas passage openings 315 on both sides of the exhaust hole 313 , and the multiple gas passage openings 315 on the same side share one second guide channel 305 .

[0136] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the second guide channels 305 is two, and the two second guide channels 305 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the second guide channel 305 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions. The second guide channel 305 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions.

[0137] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302. A portion of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31. Another portion of the gas can pass through the bracket 3 through multiple gas passages 301 and flow to the second side 312 of the bracket body 31. Then, it flows along the second guide channel 305 and finally converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0138] When injecting liquid, the electrolyte can flow along the second guide channel 305 to the multiple gas gaps 315. The electrolyte passing through the gas gaps 315 can first flow along the second guide channel 304 and then flow toward the electrode assembly 2, or it can flow directly toward the electrode assembly 2, shortening the electrolyte infiltration time and improving the infiltration efficiency.

[0139] In the above technical solution, gas passing through the bracket 3 can be guided by the second flow channel 305 to flow toward the second exhaust channel 303 located in the middle, and ultimately discharged through the explosion-proof valve 6, achieving final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. The electrolyte can also flow toward the multiple gas holes 315 under the guidance of the second flow channel 305, shortening the infiltration time and improving the infiltration efficiency.

[0140] Please refer to Figure 11 again. The second side 312 of the frame body 31 has a mounting recess 316, which is recessed toward the first side 311. The mounting recess 316 and the wall of the shell 11 where the explosion-proof valve 6 is set define a second exhaust channel 303. The exhaust hole 313 is provided on the bottom wall of the mounting recess 316.

[0141] The mounting recess 316 is a groove recessed relative to the surface of the second side 312 of the frame body 31 . The bottom wall of the mounting recess 316 is lower than the surface of the second side 312 of the frame body 31 , so that the surface where the exhaust hole 313 is located is lower than the surface of the second side 312 of the frame body 31 .

[0142] In the above technical solution, by providing a mounting recess 316 on the second side 312 of the frame body 31, the distance between the wall of the shell 11 where the explosion-proof valve 6 is provided and the exhaust hole 313 can be increased, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, further reducing the risk of combustion and explosion of the battery cell 10, and reducing the impact on adjacent battery cells 10, which is beneficial to improving the reliability and stability of the battery 100.

[0143] Among them, the side wall of the mounting recess 316 is provided with an air hole 317, which connects the second guide channel 305 and the second exhaust channel 303. The gas in the second guide channel 305 can flow to the second exhaust channel 303 through the air hole 317, and can finally be discharged from the explosion-proof valve 6 to achieve pressure relief, thereby reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0144] In some embodiments, the second side 312 of the frame body 31 is further provided with a weight-reducing groove 319 , which not only reduces the weight of the bracket 3 , but also further increases the space occupied by the exhaust path, improves the exhaust capacity, and improves space utilization.

[0145] Referring again to FIG. 10 and FIG. 11 , the second abutting portion 322 is configured to be arc-shaped, so that the second abutting portion 322 and the second extending portion 332 define an arc-shaped second guide channel 305 .

[0146] There are two second abutting portions 322, one located on either side of the exhaust hole 313. For example, the two first abutting portions 321 are each formed as an arcuate plate, with both ends of each arcuate plate spaced apart and positioned opposite the exhaust hole 313. For another example, the two first abutting portions 321 are each formed as a closed annular plate.

[0147] Among them, the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the corresponding second abutment portion 322, so that the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding second guide channel 305, so that the multiple air channels 301 are all connected to the same second guide channel 305, and the gas flowing out of the multiple air channels 301 is guided by the second guide channel 305 and converges in the second exhaust channel 303, and can finally be discharged from the explosion-proof valve 6.

[0148] Therefore, in the above technical solution, the second abutting portion 322 is arranged in an arc shape, and the plurality of air-passing notches 315 located on the same side of the exhaust hole 313 are arranged circumferentially and spaced apart around the corresponding second abutting portion 322. This defines an arc-shaped second guide channel 305, thereby increasing the space occupied by the second guide channel 305, improving the space utilization of the bracket 3, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, thereby improving the infiltration efficiency.

[0149] Please refer to Figures 3-4 and 10-11 again. The wall of the shell 11 where the explosion-proof valve 6 is set is also provided with a positive pole 1201 and a negative pole 1202. Two through holes 314 are provided on the frame body 31. The two through holes 314 are used to expose the positive pole 1201 and the negative pole 1202. The exhaust hole 313 is located between the two through holes 314. The two second abutting portions 322 and the two through holes 314 are provided in a one-to-one correspondence. Each second abutting portion 322 is provided around the outer circumference of the corresponding through hole 314.

[0150] In the above technical solution, by setting two through holes 314 on the frame body 31, the positive electrode column 1201 and the negative electrode column 1202 can be avoided, so that the positive electrode column 1201 and the negative electrode column 1202 can be connected to the corresponding conductive part 22 of the electrode assembly 2, and by setting the second abutting part 322 around the outer circumference of the corresponding through hole 314, on the one hand, the second abutting part 322 and the second extension part 332 can define a second guide channel 305 with an arc shape, thereby increasing the occupied space of the second guide channel 305, improving the space utilization rate of the bracket 3, and at the same time improving the exhaust capacity, and on the other hand, reducing the backflow of gas from the through hole 314.

[0151] Referring again to Figure 9 , the wall of through-hole 314 is provided with a positioning groove 318 for engaging with positive electrode post 1201 or negative electrode post 1202. The provision of positioning groove 318 helps improve the connection reliability between positive electrode post 1201 or negative electrode post 1202 and bracket 3. Furthermore, positioning groove 318 can accelerate the flow of electrolyte, shorten the infiltration time, and improve the infiltration efficiency.

[0152] In some embodiments, the inner periphery of the second abutment portion 322 extends beyond the wall of the through hole 314, and the positioning groove 318 includes a transverse groove section and a vertical groove section. The transverse groove section is arranged on the side surface of the second abutment portion 322 facing the frame body 31, and the vertical groove section is arranged on the wall surface of the frame body 31 at the through hole 314. Both the transverse groove section and the vertical groove section can cooperate with the positive electrode column 1201 or the negative electrode column 1202 to further improve the installation reliability of the positive electrode column 1201 or the negative electrode column 1202.

[0153] Referring to FIG. 7 again, the electrode assembly 2 includes at least two electrode assemblies 2 , which are stacked and arranged. At least one gas hole 315 is disposed opposite to the middle position of two adjacent electrode assemblies 2 .

[0154] Specifically, after the electrode assembly 2 is shaped, two oppositely arranged side walls form an arc-shaped wall. Therefore, if two electrode assemblies 2 are stacked, a recess will be defined between the two arc-shaped walls (i.e., the middle position of the two electrode assemblies 2), and at least one air gap 315 is arranged opposite to the recess.

[0155] In the above technical solution, by arranging at least one gas gap 315 relative to the middle position of two adjacent electrode assemblies 2, the gas between the two adjacent electrode assemblies 2 can quickly flow from the first side 311 of the frame body 31 through the gas gap 315 to the second side 312 of the frame body 31, and then move toward the position of the explosion-proof valve 6, so as to improve the timeliness of the pressure relief of the explosion-proof valve and improve the reliability and stability of the battery.

[0156] Please refer to Figures 3 and 4 again. The wall of the shell 11 where the explosion-proof valve 6 is set is also provided with a pole 12. The pole 12 is at least one of the positive pole 1201 and the negative pole 1202. A through hole 314 is opened on the frame body 31 to expose the pole 12. The electrode assembly 2 includes an active material coating part 21 and a conductive part 22. The conductive part 22 is connected to the active material coating part 21. The bracket 3 supports the end of the active material coating part 21 where the conductive part 22 is set.

[0157] Please refer to Figures 12 and 13. Figure 12 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Figure 13 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. The terminal 12 defines a receiving portion 121, which communicates with the through-hole 314. At least a portion of the conductive portion 22 extends through the through-hole 314 and is accommodated within the receiving portion 121. The conductive portion 22 is electrically connected to the terminal 12. In other words, the terminal 12 is configured as a hollow structure.

[0158] Here, at least partially means that the conductive portion 22 can be completely accommodated in the accommodating portion 121, or only a portion of the conductive portion 22 can be accommodated in the accommodating portion 121. Since the terminal 12 is provided with the accommodating portion 121, the hollow structure of the accommodating portion 121 can, on the one hand, reduce the weight of the terminal 12 to a certain extent, thereby improving the weight energy density of the battery cell 10 and the battery 100. On the other hand, the conductive portion 22 can be accommodated in the accommodating portion 121, which improves the assembly efficiency of the conductive portion 22 and saves the space occupied by the conductive portion 22, making full use of the space in the battery cell 10, making the cooperation between the bracket 3 and the terminal 12, and between the bracket 3 and the conductive portion 22 tighter and more reliable, making the structure of the battery cell 10 more compact, and more conducive to improving the energy density of the battery cell 10.

[0159] More specifically, by partially or entirely containing the conductive portion 22 within the accommodating portion 121, the portion of the conductive portion 22 located within the accommodating portion 121 can occupy the space within the terminal 12, thereby reducing the space occupied by the conductive portion 22 within the housing 11. When the size of the housing 11 is fixed, some space can be saved within the housing 11 to accommodate a larger active material coating portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, when the conductive portion 22 is extended from the side of the active material coating portion 21 close to the terminal 12, the space occupied by the conductive portion 22 between the active material coating portion 21 and the terminal 12 can be reduced, the size of the active material coating portion 21 in the direction in which the conductive portion 22 is extended can be increased, the distance between the active material coating portion 21 and the terminal 12 can be reduced, and the energy density of the battery cell 10 can be improved.

[0160] At the same time, by accommodating at least part of the conductive part 22 in the accommodating part 121, the space occupied by the battery cell 10 itself can be reduced, so that the battery 100 of the same volume can accommodate a larger number of battery cells 10, and the volume energy density of the battery 100 can be improved; in addition, accommodating at least part of the conductive part 22 in the accommodating part 121 to occupy the space in the terminal 12 can reduce the redundancy of the conductive part 22 in the shell 11 to at least a certain extent, reduce the probability of short circuit between the conductive part 22 and the active material coating part 21, reduce the probability of short circuit of the battery cell 10, and improve the working reliability and stability of the battery cell 10 and the battery 100.

[0161] It should be noted that, in the embodiment of the present application, the accommodation portion 121 may be located on the side of the pole 12 facing the active material coating portion 21 or on the side of the pole 12 facing away from the active material coating portion 21 .

[0162] For example, please refer to Figures 12 and 13 again. When the accommodating portion 121 is located on the side of the pole 12 facing the active material coating portion 21, the accommodating portion 121 includes a first accommodating groove 12110. The surface of the pole 12 facing the active material coating portion 21 is the pole inner end face 122. The notch of the first accommodating groove 12110 is formed on the pole inner end face 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0163] Exemplarily, the first receiving groove 12110 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole inner end surface 122 is the lower surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open downward and the groove wall recessed upward. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole inner end surface 122 is the upper surface of the pole 12, the first receiving groove 12110 is formed as a receiving groove with a groove opening open upward and the groove wall recessed downward.

[0164] In the above technical solution, on the one hand, the first receiving groove 12110 provided on the terminal 12 can reduce the weight of the terminal 12 to a certain extent, thereby increasing the weight energy density of the battery cell 10 and the battery 100. On the other hand, because the notch of the first receiving groove 12110 is formed on the terminal inner end surface 122, which is the surface of the terminal 12 on the side close to the active material coating portion 21, the first receiving groove 12110 can be opened toward the active material coating portion 21, thereby facilitating the insertion of the conductive portion 22 into the first receiving groove 12110 and improving assembly efficiency. Furthermore, this type of first receiving groove 12110 is easier to process, improving production efficiency.

[0165] In addition, the first receiving groove 12110 can be easily processed to have a larger volume, which can accommodate more conductive parts 22; at the same time, since the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and also because the first receiving groove 12110 is open toward the active material coating part 21, the first receiving groove 12110 can also serve as a storage and buffer structure for gas production inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0166] In addition, since the first receiving groove 12110 is located on the inner side of the pole 12, external foreign matter and impurities are not easy to enter the first receiving groove 12110, which can reduce the impact of external foreign matter and impurities on the electrode assembly 2, and improve the stability and reliability of the electrode assembly 2, thereby improving the stability and reliability of the battery cell 10 and the battery 100.

[0167] Referring again to FIG. 12 , in the embodiments of the present application, the connection method between the pole 12 and the housing 11 is not limited, and may be welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113 to facilitate the mounting of the pole 12 to the housing 11 through the mounting hole 113, and this is not limited here.

[0168] At the same time, the first receiving groove 12110 can be arranged corresponding to the position of the mounting hole 113. In other words, on a projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the first receiving groove 12110 is located within the orthographic projection range of the mounting hole 113. This allows the first receiving groove 12110 to have a greater depth to accommodate more conductive portions 22, thereby further reducing the space occupied by the conductive portions 22 within the housing 11. Specifically, when the housing 11 is provided with the mounting hole 113 and the pole 12 is mounted in the mounting hole 113, along the axial direction R of the pole 12, the depth H1 of the first receiving groove 12110 is greater than or equal to the minimum distance H2 between the inner end face 122 of the pole and the mounting hole 113.

[0169] It should be noted that the specific shape of the first receiving groove 12110 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 along the axial direction R of the pole 12.

[0170] Since in the axial direction R of the pole 12, the depth H1 of the first accommodating groove 12110 is greater than or equal to the minimum distance H2 from the inner end face 122 of the pole to the mounting hole 113, the volume of the pole 12 can be fully utilized, so that the first accommodating groove 12110 has a larger depth, which is conducive to accommodating more conductive parts 22, and thus can greatly reduce the space occupied by the conductive parts 22 in the shell 11, further improve the energy density of the battery cell 10, and further reduce the redundancy of the conductive parts 22 in the shell 11; at the same time, since the first accommodating groove 12110 has a larger depth, it can also accommodate the gas production of the electrode assembly 2, improve the reliability and stability of the battery cell 10, and can also accommodate more electrolyte to increase the service life of the battery cell 10.

[0171] Please refer to Figures 12 and 13 again. In order to improve the stability and reliability of the electrical connection between the active material coating portion 21 and the pole 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 can be located on the groove wall of the first accommodating groove 12110 formed by the accommodating portion 121.

[0172] Exemplarily, the conductive part 22 and the pole 12 can be electrically connected by welding, and the electrical connection position is the welding position of the conductive part 22 and the pole 12. At the same time, the welding method of the conductive part 22 and the pole 12 is not limited, for example, it can be laser welding, and according to factors such as the position, angle, or structure of the welding part, vertical welding, inclined welding, lap welding, or edge welding can be selected. In other embodiments of the present application, the conductive part 22 and the pole 12 can also be electrically connected by other means instead of welding, such as by providing conductive glue or conductive nails. To simplify the description, the following text will take the case where the conductive part 22 and the pole 12 are welded to form an electrical connection, and the welding position is the electrical connection position of the conductive part 22 and the pole 12 as an example for introduction.

[0173] Specifically, the electrode 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on a side of the first side wall 12113 away from the active material coating portion 21. The first end wall 12111 and the first side wall 12113 enclose a first receiving groove 12110. The electrical connection position between the conductive portion 22 and the electrode 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 can be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0174] In the above technical solution, by arranging the electrical connection position between the conductive portion 22 and the terminal 12 on at least one of the first end wall 12111 and the first side wall 12113, the first receiving groove 12110 not only serves to accommodate at least a portion of the conductive portion 22, but the groove wall of the first receiving groove 12110 also serves to establish an electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12, facilitates the processing of the terminal 12, simplifies the structure of the conductive portion 22, reduces redundancy in the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by utilizing the groove wall of the first receiving groove 12110 to establish an electrical connection with the conductive portion 22, the area where the conductive portion 22 is electrically connected to the terminal 12 can be set relatively large, which not only reduces the difficulty of electrical connection, but also improves the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0175] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the first receiving groove 12110, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0176] In addition, in an embodiment of the present application, the first end wall 12111 is constructed as a closed structure without a through-hole 12130, so that the first receiving tank 12110 is isolated from the external space of the shell 11, thereby avoiding the problem of the electrolyte in the shell 11 leaking from the first receiving tank 12110.

[0177] Referring again to Figures 12 and 13, in some optional embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the first end wall 12111, and the conductive portion 22 is positioned in a manner that conforms to the shape of the first end wall 12111 and is electrically connected thereto, such that the portion where the conductive portion 22 is electrically connected to the first end wall 12111 extends along the length or width of the first end wall 12111. For example, when the first end wall 12111 is planar, a portion of the conductive portion 22 can also be planar and conform to the first end wall 12111, and an electrical connection, such as welding, can be made at the conforming portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0178] In addition, when the electrical connection between the conductive part 22 and the first end wall 12111 is welding, since the first end wall 12111 is located on the side of the first receiving groove 12110 away from the active material coating part 21, it is convenient to perform welding operations. For example, welding can be performed from the side of the pole 12 away from the active material coating part 21.

[0179] It is worth noting that the shape of the first end wall 12111 is not limited, and can be, for example, a flat plate, an arc-shaped plate, etc. Specifically, when the first end wall 12111 is a flat plate structure, the first end wall 12111 is arranged at an angle to the axial direction R of the pole 12. For example, the first end wall 12111 can be a flat plate structure perpendicular to the axial direction R of the pole 12, or can be an inclined plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0180] Of course, in other embodiments of the present application, the position where the conductive part 22 is electrically connected to the first end wall 12111 may not extend along the length or width direction of the first end wall 12111. For example, it may be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the first end wall 12111, which will not be elaborated here.

[0181] Please refer to Figure 14, which is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. When the conductive portion 22 is electrically connected to the first end wall 12111, a first sinking groove 12112 can be provided on the first end wall 12111, and the sinking direction of the first sinking groove 12112 is away from the active material coating portion 21. At least a portion of the position where the conductive portion 22 is electrically connected to the first end wall 12111 is located within the first sinking groove 12112. For example, at least a portion of the conductive portion 22 can be provided within the first sinking groove 12112 and connected to the portion of the first end wall 12111 that is used to define the first sinking groove 12112.

[0182] In the above technical solution, on the one hand, the first sinking groove 12112 can be used to realize pre-positioning and limiting of the electrical connection position of the conductive part 22, which is not only conducive to finding the correct position to realize electrical connection and improve production efficiency, but also helps to improve the stability and reliability of the conductive part 22, and improve the stability and reliability of the battery cell 10 during the charging and discharging process; on the other hand, by arranging the first sinking groove 12112 on the first end wall 12111, the local wall thickness of the first end wall 12111 can be locally thinned, which is not only conducive to welding, but also helps to reduce the weight of the pole 12 and improve the weight energy density of the battery cell 10.

[0183] Please refer to Figures 13 and 14 again. In the embodiment of the present application, the pole 12 can also be provided with a first groove 126 as needed. The first groove 126 is located on the side of the pole 12 away from the active material coating portion 21, that is, the surface of the side of the pole 12 away from the active material coating portion 21 is the pole outer end face 123, and the notch of the first groove 126 is formed on the pole outer end face 123.

[0184] It is understood that the first groove 126 is a groove body, which is a groove-like structure with a certain depth. Moreover, when the pole 12 is arranged on the upper end wall of the shell 11 and the pole outer end surface 123 is the upper surface of the pole 12, the first groove 126 is formed as a first groove 126 with a groove opening open upward and a groove wall recessed downward (i.e., a square recessed toward the electrode assembly 2). For another example, when the pole 12 is arranged on the lower end wall of the shell 11 and the pole outer end surface 123 is the lower surface of the pole 12, the first groove 126 is formed as a first groove 126 with a groove opening open downward and a groove wall recessed upward (i.e., a square recessed toward the electrode assembly 2).

[0185] In the above technical solution, on the one hand, since the pole 12 is provided with the first groove 126, the weight of the pole 12 can be further reduced, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, the first groove 126 is located on the outside of the pole 12, that is, it is open to the side of the pole 12 away from the interior of the shell 11. The first groove 126 can be used to accommodate or install structural components in the battery 100 that electrically connect the various battery cells 10, so as to make full use of the space inside the pole 12 and improve the space utilization and volume energy density of the battery 100.

[0186] In addition, since the terminal 12 has both the first receiving groove 12110 and the first groove 126, the first groove 126 is located on the side of the first receiving groove 12110 away from the active material coating portion 21, and the first groove 126 is open in a direction away from the first receiving groove 12110. This facilitates laser welding of the conductive portion 22 to the first end wall 12111 through the first groove 126 from the outside of the terminal 12, that is, the side of the terminal 12 away from the active material coating portion 21, thereby facilitating electrical connection between the conductive portion 22 and the terminal 12 through external welding. In other words, the above-mentioned structural arrangement facilitates external welding of the terminal 12 and the conductive portion 22 through the first groove 126, facilitates the processing and manufacturing of the battery cell 10, and can save processing and manufacturing costs.

[0187] Furthermore, in order to conveniently and effectively weld the conductive part 22 to the groove wall of the first receiving groove 12110 through the first groove 126, and improve the welding reliability of the conductive part 22 to the groove wall of the first receiving groove 12110, in an embodiment of the present application, the part between the first groove 126 and the first receiving groove 12110 can be laser welded to the conductive part 22, that is, the spacer part 127 shown in Figure 14 can be laser welded to the conductive part 22 to achieve electrical connection between the electrode assembly 2 and the pole 12. The thickness of the spacer 127 of the pole 12 located between the first groove 126 and the first receiving groove 12110 is relatively thin. The spacer 127 isolates the first groove 126 and the first receiving groove 12110. The side wall of the spacer 127 close to the active material coating part 21 can be used as the first end wall 12111. When the conductive part 22 needs to be welded to the first end wall 12111, since the thickness of the spacer 127 is relatively thin, it is conducive to the welding of the conductive part 22 and the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of welding.

[0188] Please refer to Figure 13 again. Furthermore, the battery cell 10 may also include a slot cover 7, which is provided on the terminal 12 and covers the notch of the first groove 126. In the above technical solution, by providing the slot cover 7 to cover the first groove 126, the terminal 12 can be indirectly electrically connected to the busbar through the slot cover 7. By adjusting the position and structure of the slot cover 7, the electrical connection between the slot cover 7 and the busbar can be more convenient and the electrical connection area can be larger. Therefore, by providing the slot cover 7, the electrical connection between adjacent battery cells 10 in the battery 100 can be facilitated. Since the position where the battery cells 10 are electrically connected to each other is located at the slot cover 7, the electrical connection position between the conductive portion 22 and the terminal 12 can be separated by the first groove 126, and there is less interference between the two, which can further improve the stability and reliability of the battery cell 10.

[0189] For example, please refer to Figure 15, which is a partial cross-sectional schematic diagram of the battery cell 10 provided in some embodiments of the present application. The accommodating portion 121 can also be configured to include a second accommodating groove 12120. The surface of the pole 12 away from the active material coating portion 21 is the pole outer end face 123. The notch of the second accommodating groove 12120 is formed on the pole outer end face 123. The second accommodating groove 12120 is connected to the interior of the shell 11 through the through hole 12130. The conductive portion 22 is passed through the through hole 12130 and is at least partially accommodated in the second accommodating groove 12120.

[0190] It is understood that the second receiving groove 12120 is a groove body, which is a groove-like structure with a certain depth. For example, when the pole 12 is disposed on the upper end wall of the housing 11 and the pole outer end surface 123 is the upper surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with an upwardly open groove opening and a downwardly recessed groove wall. For another example, when the pole 12 is disposed on the lower end wall of the housing 11 and the pole outer end surface 123 is the lower surface of the pole 12, the second receiving groove 12120 is formed as a receiving groove with a downwardly open groove opening and an upwardly recessed groove wall.

[0191] In the above technical solution, please refer to Figure 15 again. On the one hand, the pole 12 is provided with a second receiving groove 12120, which can reduce the weight of the pole 12 to a certain extent, so as to improve the weight energy density of the battery cell 10 and the battery 100; on the other hand, since the notch of the second receiving groove 12120 is formed on the outer end surface 123 of the pole, and the outer end surface 123 of the pole is the surface of the pole 12 away from the active material coating part 21, the second receiving groove 12120 can be open in the direction away from the active material coating part 21. In this way, when at least a part of the conductive part 22 is accommodated in the second receiving groove 12120, the conductive part 22 can be easily stored and sorted through the notch of the second receiving groove 12120, and the electrical connection operation between the conductive part 22 and the pole 12 can be easily achieved through the notch of the second receiving groove 12120, thereby reducing the production difficulty of the battery cell 10 and improving the production efficiency of the battery cell 10.

[0192] At the same time, since the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a buffer and temporary storage structure for the electrolyte, so that more electrolyte can be accommodated in the shell 11. Since the battery cell 10 will lose electrolyte during the charging and discharging process, when there is more electrolyte, the service life of the battery cell 10 can be extended; and because the second receiving tank 12120 can be connected to the interior of the shell 11 through the perforation 12130, the second receiving tank 12120 can also serve as a receiving and buffer structure for gas production inside the electrode assembly 2, reducing the expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0193] It is worth noting that when the accommodating portion 121 has a second accommodating groove 12120 and the conductive portion 22 is disposed through the through-hole 12130 and is at least partially accommodated within the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the terminal 12 is not limited. For example, when the conductive portion 22 is disposed through the through-hole 12130 and is at least partially accommodated within the second accommodating groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the terminal 12 is located at the hole wall of the through-hole 12130 formed in the terminal 12.

[0194] In the above technical solution, by setting the electrical connection position between the conductive part 22 and the pole 12 on the hole wall of the through-hole 12130, it is convenient to electrically connect the conductive part 22 and the pole 12 through the second accommodating groove 12120, and when the electrical connection area between the conductive part 22 and the pole 12 is large, the electrical connection between the conductive part 22 and the pole 12 can be used to achieve the sealing of the through-hole 12130, so as to save sealing costs, reduce electrolyte leakage, and save sealing parts.

[0195] Specifically, the conductive part 22 can be welded to the hole wall of the through-hole 12130 at the position where the through-hole 12130 is connected to the second receiving groove 12120, which is convenient for operation. In addition, the through-hole 12130 can be sealed by controlling the weld mark and utilizing the weld mark and the conductive part 22 to improve the problem of electrolyte in the shell 11 leaking from the through-hole 12130.

[0196] As another example, when the conductive portion 22 is provided through the through-hole 12130 and is at least partially accommodated in the second receiving groove 12120, in other embodiments of the present application, the electrical connection position between the conductive portion 22 and the pole 12 may also be located on the groove wall of the second receiving groove 12120 formed by the pole 12. This facilitates the electrical connection operation. For example, when the conductive portion 22 is welded to the groove wall of the second receiving groove 12120 formed by the pole 12, the conductive particles generated by the welding can be prevented from entering the housing 11 and causing problems such as a short circuit.

[0197] Please refer to Figure 15 again. The pole 12 includes a second end wall 12121 and a second side wall 12123. The second end wall 12121 is located on the side of the second side wall 12123 close to the active material coating portion 21. The second end wall 12121 and the second side wall 12123 are arranged to form a second receiving groove 12120. The through hole 12130 is opened in the second end wall 12121. The electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or on the second side wall 12123.

[0198] More specifically, the conductive portion 22 and the pole 12 can be electrically connected by welding, so the welding position is the electrical connection position between the conductive portion 22 and the pole 12. In other embodiments of the present application, the conductive portion 22 and the pole 12 can also be electrically connected by other methods instead of welding, such as by providing conductive glue or conductive nails, which will not be described in detail here.

[0199] To simplify the description, the following description uses the example of welding the conductive portion 22 to the pole 12 to form an electrical connection, where the welding location is the electrical connection location between the conductive portion 22 and the pole 12. For example, in some embodiments, the electrical connection location between the conductive portion 22 and the pole 12 is located at the second end wall 12121 and / or the second side wall 12123, and the conductive portion 22 may be welded to at least one of the second end wall 12121 and the second side wall 12123.

[0200] In the above technical solution, by locating the electrical connection point between the conductive portion 22 and the terminal 12 on at least one of the second end wall 12121 and the second side wall 12123, the second receiving groove 12120 not only accommodates at least part of the conductive portion 22, but also the groove wall of the second receiving groove 12120 also functions to achieve electrical connection with the conductive portion 22. This simplifies the structure of the terminal 12 and facilitates the processing of the terminal 12. Furthermore, because the through-hole 12130 is provided in the second end wall 12121, the conductive portion 22 can easily extend into the second receiving groove 12120 through the through-hole 12130, simplifying the structure of the conductive portion 22, reducing redundancy in the conductive portion 22, and lowering the cost of the conductive portion 22. Moreover, the opening direction of the slot of the second receiving groove 12120 makes it easy to electrically connect the conductive part 22 with the slot wall of the second receiving groove 12120 through the slot of the second receiving groove 12120, which can reduce the difficulty of electrical connection. Moreover, by utilizing the slot wall of the second receiving groove 12120 to achieve electrical connection with the conductive part 22, the area where the conductive part 22 is electrically connected to the pole 12 can be relatively large, which can improve the reliability and stability of the electrical connection, thereby improving the performance of the battery cell 10.

[0201] In addition, since the electrical connection position between the conductive part 22 and the pole 12 is located in the second receiving groove 12120, it can not only prevent the electrical connection position from protruding from the outside of the pole 12 and occupying the space outside the pole 12, but also enable the electrical connection position to be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive part 22 and the pole 12.

[0202] Referring again to FIG. 15 , in some embodiments, the shape of a portion of the conductive portion 22 matches the shape of a portion of the second end wall 12121, and the conductive portion 22 is positioned to fit and electrically connect to the second end wall 12121, such that the portion where the conductive portion 22 electrically connects to the second end wall 12121 extends along the length or width of the second end wall 12121. For example, if the second end wall 12121 is planar, a portion of the conductive portion 22 can also be planar and fit to the second end wall 12121, and an electrical connection, such as welding, can be made at the fitting portion. This can increase the area of ​​the electrical connection, improving the reliability and stability of the electrical connection.

[0203] It is worth noting that the shape of the second end wall 12121 is not limited, and can be, for example, a flat plate or an arc-shaped plate structure. When the second end wall 12121 is a flat plate structure, it is arranged at an angle to the axial direction R of the pole 12. For example, it can be a flat plate structure perpendicular to the axial direction R of the pole 12, or it can be an inclined flat plate structure that is not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0204] For example, referring again to FIG. 15 , when the second end wall 12121 is a flat plate, the angle θ between the second end wall 12121 and the axial direction R of the electrode 12 is equal to 90°. That is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 is equidistant from the active material coating portion 21. This facilitates welding of the conductive portion 22 to the second end wall 12121.

[0205] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is greater than 90°, that is, along the direction from the through-hole 12130 to the second side wall 12123, the second end wall 12121 extends obliquely toward the direction close to the active material coating portion 21. As a result, the extension distance of the conductive portion 22 along the second end wall 12121 can be increased to increase the reliability of the electrical connection. Exemplarily, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 90°-145°, such as 100°, 110°, 120°, 130°, 140°, etc. On the one hand, this can make the second end wall 12121 easy to process and convenient for electrical connection with the conductive portion 22, and on the other hand, it can more fully utilize the space inside the pole 12 to accommodate the conductive portion 22.

[0206] For another example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 is less than 90°, that is, along the direction from the through hole 12130 to the second side wall 12123 , the second end wall 12121 extends obliquely away from the active material coating portion 21 .

[0207] As a result, the conductive portion 22 can extend a greater distance along the second end wall 12121, thereby increasing the reliability of the electrical connection. For example, the angle θ between the second end wall 12121 and the axial direction R of the pole 12 can be 45°-90°, such as 50°, 60°, 70°, 80°, etc. This can facilitate machining of the second end wall 12121 and facilitate electrical connection to the conductive portion 22. Furthermore, the space within the pole 12 can be more fully utilized to accommodate the conductive portion 22.

[0208] Of course, the present application is not limited to this. In other embodiments of the present application, the position where the conductive part 22 is electrically connected to the second end wall 12121 may not extend along the length or width direction of the second end wall 12121. It may also be a plurality of discretely arranged points. For example, the conductive part 22 has a plurality of spaced-apart parts that are respectively welded to the second end wall 12121, which will not be elaborated here.

[0209] Please refer again to Figure 15 and further to Figure 16, which is a schematic partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Regardless of the specific value of the angle θ between the second end wall 12121 and the axial direction R of the terminal 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second recess 12122 can be provided on the second end wall 12121 as required. The second recess 12122 is a groove formed by a portion of the second end wall 12121 that is recessed toward the end closest to the active material coating portion 21. The location where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located within the second recess 12122.

[0210] In the above technical solution, the portion of the conductive part 22 located in the second groove 12122 is set to match the shape of the second groove 12122, and is fitted to achieve electrical connection. The second groove 12122 can be used to pre-position and limit the electrical connection position of the conductive part 22, which is conducive to finding the correct position to achieve electrical connection, improve production efficiency, and improve the stability and reliability of the electrical connection position, so as to improve the reliability and stability of the charging and discharging operations of the battery cell 10.

[0211] Referring again to FIG. 16 , in the embodiment of the present application, the connection method between the pole 12 and the housing 11 is not limited, and can be welding or riveting. For example, when the two are riveted, the housing 11 has a mounting hole 113, and the pole 12 is riveted to the mounting hole 113. Of course, it is understood that when the two are welded or otherwise coupled, the housing 11 may also have a mounting hole 113, and the pole 12 may be mounted to the mounting hole 113.

[0212] Optionally, referring to Figure 15 again, the second accommodating groove 12120 can be set corresponding to the position of the mounting hole 113, or in other words, on the projection plane perpendicular to the axial direction R of the pole 12, the orthographic projection of the second accommodating groove 12120 is located within the orthographic projection range of the mounting hole 113, so that the second accommodating groove 12120 can have a larger depth to accommodate more conductive parts 22, thereby reducing the space occupied by the conductive parts 22 in the shell 11 to a greater extent.

[0213] In some embodiments, please refer to Figure 15 again. When the housing 11 has a mounting hole 113 and the pole 12 is installed in the mounting hole 113, along the axial direction R of the pole 12, the depth H3 of the second accommodating groove 12120 is greater than or equal to the minimum distance H4 from the outer end face 123 of the pole to the mounting hole 113.

[0214] It should be noted that the specific shape of the second receiving groove 12120 is not limited and can be regular or irregular, such as a cylindrical groove with a rectangular, elliptical, or racetrack-shaped cross-section, a trapezoidal groove with a rectangular cross-section and gradually changing cross-sectional dimensions, a hemispherical groove with a circular cross-section and gradually changing cross-sectional dimensions, or a hemispherical groove with an elliptical cross-section and gradually changing cross-sectional dimensions, etc. It is worth noting that the racetrack shape described herein refers to a shape in which the two short sides of a rectangle are replaced by convex curves.

[0215] Therefore, the depth H3 of the second receiving groove 12120 refers to the maximum depth of the second receiving groove 12120 along the axial direction R of the terminal 12. Since the depth H3 of the second receiving groove 12120 is greater than or equal to the minimum distance H4 between the terminal outer end surface 123 and the mounting hole 113 in the axial direction R of the terminal 12, the volume of the terminal 12 can be fully utilized, resulting in the second receiving groove 12120 having a greater depth, which is conducive to accommodating more conductive parts 22, thereby greatly reducing the space occupied by the conductive parts 22 within the housing 11, further improving the energy density of the battery cell 10, and further reducing the redundancy of the conductive parts 22 within the housing 11. At the same time, due to the greater depth of the second receiving groove 12120, it can also accommodate gassing of the electrode assembly 2, improve the reliability and stability of the battery cell 10, and accommodate more electrolyte, thereby increasing the service life of the battery cell 10.

[0216] Please refer to Figure 16 and further to Figure 17, which is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. In the embodiments of the present application, when the accommodating portion 121 includes the second accommodating groove 12120 of any of the above embodiments, the battery cell 10 may optionally further include a cover plate 13, which cooperates with the terminal 12 and closes the notch of the second accommodating groove 12120, and is electrically connected to the terminal 12.

[0217] In the above technical solution, by providing a cover plate 13 to close the notch of the second receiving tank 12120, the electrolyte in the shell 11 can be prevented from leaking from the notch of the second receiving tank 12120. Moreover, since the cover plate 13 closes the notch of the second receiving tank 12120 and is electrically connected to the pole 12, the cover plate 13 can be used to easily realize the indirect electrical connection between the pole 12 and the busbar component, and it is beneficial to increase the connection area of ​​the electrical connection, thereby helping to reduce the resistance of the electrical connection.

[0218] It is worth noting that the manner and position of engagement between the cover plate 13 and the terminal 12 are not limited, as long as the cover plate 13 can seal the notch of the second receiving slot 12120. For example, in some embodiments, the cover plate 13 can be welded to the terminal 12. During processing, the conductive portion 22 can first be passed through the through-hole 12130 and welded to the wall of the second receiving slot 12120. The cover plate 13 and the terminal 12 are then welded to seal the notch of the second receiving slot 12120.

[0219] It should also be noted that the specific composition of the cover plate 13 is not limited. For example, in some optional embodiments, referring to FIG17 , the cover plate 13 includes a first conductive member 131 and a second conductive member 132 made of different materials. The first conductive member 131 is engaged with and electrically connected to the pole 12, and the second conductive member 132 is engaged with and electrically connected to the first conductive member 131.

[0220] In the above technical solution, the cover plate 13 is configured as a composite form, and the first conductive member 131 is configured to be made of the same material as the pole 12, thereby facilitating electrical connection between the first conductive member 131 and the pole 12. For example, the first conductive member 131 can be easily and stably connected to the pole 12 through welding. In addition, because the second conductive member 132 is made of a different material from the first conductive member 131, it is convenient to use the second conductive member 132 to electrically connect to a busbar component made of a different material from the pole 12. For example, the second conductive member 132 can be easily and stably connected to a busbar component made of the same material as the second conductive member 132 through welding.

[0221] For example, when the electrode 12 is a negative electrode 12, the electrode 12 is a copper electrode, and the current collector is an aluminum sheet, the first conductive member 131 can be set to copper, and the second conductive member 132 can be set to aluminum. In this case, the electrode 12 and the first conductive member 131 are made of the same material and can be effectively welded, and the second conductive member 132 and the current collector are made of the same material and can be effectively welded, thereby effectively achieving an indirect electrical connection between the electrode 12 and the current collector through the cover 13. Moreover, the copper-to-copper welding of the electrode 12 and the first conductive member 131 has good fluidity and is less likely to crack, which helps to improve the sealing effect of the weld.

[0222] Referring again to FIG. 17 , in some optional examples, the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second receiving groove 12120 and the second conductive member 132, it can separate the second receiving groove 12120 from the second conductive member 132. Therefore, when the electrolyte in the housing 11 enters the second receiving groove 12120 through the through-hole 12130, the first conductive member 131 can prevent the electrolyte from contacting the second conductive member 132, thereby solving the problem of electrolyte corrosion on the second conductive member 132.

[0223] It is worth noting that the coupling method between the first conductive member 131 and the second conductive member 132 is not limited. For example, in some embodiments, referring to FIG17 , the first conductive member 131 has a second groove 1311, and the second conductive member 132 is embedded in the second groove 1311. The notch of the second groove 1311 is formed on the surface of the first conductive member 131 away from the second receiving slot 12120, so that the second conductive member 132 is exposed through the notch of the second groove 1311. Alternatively, in other embodiments, the connection method between the first conductive member 131 and the second conductive member 132 can also be a fastening connection, a snap connection, etc.

[0224] It should also be noted that the "exposed" of the second conductive member 132 by the notch of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the notch position of the second groove 1311, and the second conductive member 132 is not required to protrude from the notch of the second groove 1311. For example, the second conductive member 132 can be flush with the surface of the first conductive member 131 on the side away from the second accommodating groove 12120, or the second conductive member 132 can protrude from the surface of the first conductive member 131 on the side away from the second accommodating groove 12120.

[0225] In the above technical solution, on the one hand, by embedding the second conductive member 132 within the first conductive member 131, the difficulty of assembling the first and second conductive members 131, 132 can be reduced, the stability and convenience of the cooperation between the first and second conductive members 131, 132 can be improved, and the thickness of the cover plate 13 can be reduced, reducing the space occupied by the cover plate 13, thereby improving the space utilization of the battery cell 10. On the other hand, because the second conductive member 132 can be exposed from the surface of the first conductive member 131 away from the second receiving groove 12120 through the notch of the second groove 1311, it is convenient to achieve electrical connection between the second conductive member 132 and the current collecting component outside the terminal 12.

[0226] In addition, since the notch of the second groove 1311 is formed on the surface of the first conductive member 131 on the side away from the second receiving groove 12120, it means that the second groove 1311 is open in the direction away from the active material coating portion 21, so that the portion of the groove wall of the first conductive member 131 used to define the second groove 1311 is located between the second receiving groove 12120 and the second conductive member 132 to separate the second receiving groove 12120 and the second conductive member 132, thereby preventing the electrolyte entering the second groove 1311 from contacting the second conductive member 132, thereby reducing leakage of the electrolyte.

[0227] Of course, in other embodiments, the cover plate 13 may not be a composite form composed of multiple materials. For example, in other embodiments of the present application, the cover plate 13 as a whole may be set to a non-composite form made of the same material, such as for adapting to the positive electrode column 12, which will not be elaborated here.

[0228] Referring again to Figure 17 , the cover plate 13 is further embedded in the notch of the second receiving groove 12120. In the above technical solution, embedding the cover plate 13 in the second receiving groove 12120 reduces the difficulty of assembling the cover plate 13 and the terminal 12, improves the assembly stability of the cover plate 13 and the terminal 12, and improves the reliability and convenience of the connection. It also reduces the space occupied by the cover plate 13 outside the terminal 12. Furthermore, because the cover plate 13 is embedded in the notch of the second receiving groove 12120, there is sufficient space within the second receiving groove 12120 to accommodate the conductive portion 22.

[0229] Of course, in other embodiments of the present application, the cooperation manner of the cover plate 13 and the pole 12 is not limited to being embedded in the second receiving groove 12120. The cover plate 13 can also be directly covered on the outside of the pole 12, that is, directly covered at the notch of the second receiving groove 12120, so as to facilitate cooperation with the convergence component of the battery 100. This is not limited in this embodiment.

[0230] In an optional solution, the electrode 12 includes two electrodes, namely a positive electrode 1201 and a negative electrode 1202, and the through-holes 314 include two electrodes, each of which exposes the positive electrode 1201 and the negative electrode 1202. When the electrode assembly 2 is installed in the housing 11, the two conductive portions 22 of the electrode assembly 2 can simultaneously and separately pass through the two through-holes 314 on the bracket 3, thereby facilitating connection between the two conductive portions 22 and the positive electrode 1201 and the negative electrode 1202, respectively, thereby improving production efficiency.

[0231] Referring again to Figure 4 , the battery cell 10 further includes an insulating member 4 , which is connected to the bracket 3 and together wraps around the circumference of the electrode assembly 2 . The insulating member 4 serves to isolate the electrical connection components within the housing 11 from the housing 11 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, etc. The insulating member 4 and the bracket 3 can be connected by adhesive or heat-seal. Alternatively, the insulating member 4 and the bracket 3 can be connected by other methods.

[0232] As shown in FIG2 , according to some embodiments of the present application, the present application further provides a battery 100 , comprising a battery cell 10 according to any of the above solutions.

[0233] In the technical solution of the embodiment of the present application, by adopting the above-mentioned battery cell 10, the risk of combustion and explosion of the battery cell 10 can be reduced, and the impact on adjacent battery cells 10 can be reduced, which is conducive to improving the reliability and stability of the battery 100.

[0234] As shown in FIG1 , according to some embodiments of the present application, the present application further provides an electric device 1000, comprising a battery cell 10 according to any of the above solutions, or a battery 100 according to the above solutions, and the battery 100 is used to provide power to the electric device 1000. The electric device 1000 can be any of the aforementioned devices or systems using the battery 100.

[0235] In the technical solution of the embodiment of the present application, the use of the above-mentioned battery 100 is beneficial to improving the reliability and stability of the electrical device 1000.

[0236] Please refer to Figures 3 to 11 again. According to some embodiments of the present application, the present application provides a bracket 3, which is used for a battery cell 10. The battery cell 10 includes a shell 11 and an electrode assembly 2. An explosion-proof valve 6 is provided on the shell 11, and the electrode assembly 2 is arranged in the shell 11.

[0237] The bracket 3 includes a frame body 31, which has a first side 311 and a second side 312. The first side 311 and the second side 312 are arranged opposite to each other in the thickness direction of the frame body 31. The frame body 31 is provided with an exhaust hole 313, which passes through the first side 311 and the second side 312 of the frame body 31. The exhaust hole 313 is used to be opposite to the explosion-proof valve 6.

[0238] The bracket 3 also includes a first abutment portion 321, which is arranged on the first side 311 of the bracket body 31, and the first abutment portion 321 protrudes in a direction away from the second side 312. The first abutment portion 321 is used to abut with the end of the electrode assembly 2 so that the exhaust hole 313 is spaced apart from the end of the electrode assembly 2 and together form a first exhaust channel 302.

[0239] In the technical solution of the embodiment of the present application, a first abutting portion 321 is provided on the first side 311 of the frame body 31, and the first abutting portion 321 abuts against the end of the electrode assembly 2, so that the distance between the first side 311 of the frame body 31 and the end of the electrode assembly 2 can be increased, that is, the distance between the exhaust hole 313 and the end of the electrode assembly 2 is increased, so that a first exhaust channel 302 connected to the exhaust hole 313 is defined between the first side 311 of the frame body 31 and the end of the electrode assembly 2, thereby improving the exhaust capacity. When the battery cell 10 tends to thermal runaway, the generated gas can first enter the first exhaust channel 302, and then pass through the bracket 3 from the exhaust hole 313, and finally be discharged from the explosion-proof valve 6 to achieve rapid pressure relief, thereby reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0240] In some embodiments, the bracket 3 is provided with a gas notch 315 that passes through the first side 311 and the second side 312. The bracket 3 can cooperate with the shell 11 of the battery cell 10 to form a gas channel 301 between the gas notch 315 and the shell 11, and the gas channel 301 is connected to the first exhaust channel 302.

[0241] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas can pass through the bracket 3 through the exhaust hole 313, and the other part of the gas can pass through the bracket 3 through the gas channel 301, and finally be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0242] In the above technical solution, by setting a gas notch 315 on the bracket 3, the gas notch 315 can be used to define a gas channel 301 with the shell 11. On the one hand, the gas generated circumferentially by the electrode assembly 2 can move to the position of the explosion-proof valve 6 through the gas channel 301 at the corresponding position in a short time, so as to improve the timeliness of the pressure relief of the explosion-proof valve 6. At the same time, the gas in the first exhaust channel 302 can flow to the exhaust hole 313 and the gas channel 301 respectively in a short time to achieve instantaneous pressure relief, and finally can be discharged from the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. On the other hand, when injecting liquid, the electrolyte can flow toward the electrode assembly 2 through the gas notch 315, which can shorten the infiltration time and improve the infiltration efficiency.

[0243] In some embodiments, a first extension portion 331 is further protruded from the first side 311 of the frame body 31 . The first extension portion 331 is arranged around the circumference of the frame body 31 and defines a mating groove 30 with the frame body 31 for mating with the end of the electrode assembly 2 .

[0244] The bracket 3 can be assembled with the electrode assembly 2 and then installed into the shell 11 together. Alternatively, the bracket 3 can be pre-installed on the shell 11, and then the electrode assembly 2 is installed in the shell 11 and matched with the bracket 3.

[0245] In an embodiment in which the bracket 3 and the electrode assembly 2 are assembled and then installed together into the shell 11, during the shell insertion process, the first extension portion 331 can protect the electrode assembly 2, reduce the probability of the electrode assembly 2 touching the shell 11, and further reduce the occurrence of the shell 11 scratching the electrode assembly 2, so as to reduce the possibility of the active material of the electrode assembly 2 falling off, to a certain extent prevent the internal short circuit caused by the overlapping of the fallen active material and the pole piece of opposite polarity, and to a certain extent prevent the fallen active material from chemically reacting with the shell 11, thereby causing the shell 11 to be corroded and penetrated, thereby improving the reliability of the battery cell 10, and the first extension portion 331 and the electrode assembly 2 can be snapped together, to a certain extent prevent the bracket 3 from falling off before entering the shell, thereby improving the product quality rate of the battery cell 10. After entering the shell, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0246] In an embodiment in which the bracket 3 is pre-installed on the shell 11 and the electrode assembly 2 is subsequently installed into the shell 11, the first extension portion 331 can constrain one end of the electrode assembly 2, reduce the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protect one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0247] In the above technical solution, by setting the first extension portion 331, one end of the electrode assembly 2 can be constrained, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 becoming fluffy, and also protecting one end of the electrode assembly 2, reducing the problem of one end of the electrode assembly 2 touching the shell 11, thereby reducing the occurrence of the shell 11 scratching the electrode assembly 2 and improving the reliability of the battery cell 10.

[0248] In addition, since the end of the electrode assembly 2 extends into the fitting groove 30, the distance between the bracket 3 and the end of the electrode assembly 2 can be shortened, thereby improving the energy density of the battery.

[0249] In some embodiments, the first extension portion 331 and the first abutting portion 321 are spaced apart from each other to form a first guide channel 304 . The first guide channel 304 is used to connect at least one air passage 301 and the first exhaust channel 302 .

[0250] First guide channel 304 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide, allowing some of the gas entering first exhaust channel 302 to flow along first guide channel 304 to gas passage 301. The gas then passes through gas passage 301, through bracket 3, and ultimately out of explosion-proof valve 6 to relieve pressure, further reducing the risk of combustion and explosion of battery cells 10 and improving the reliability and stability of battery 100. Furthermore, first guide channel 304 guides the flow of electrolyte, further shortening the infiltration time and significantly improving infiltration efficiency.

[0251] In the longitudinal direction of the bracket 3 , there are multiple air passage openings 315 on both sides of the exhaust hole 313 , and the multiple air passage openings 315 on the same side share one first guide channel 304 .

[0252] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the first guide channels 304 is two, and the two first guide channels 304 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the first guide channel 304 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air channels 301 at the corresponding positions, and the first guide channel 304 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the first guide channel 304 is connected with the multiple air channels 301 at the corresponding positions.

[0253] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302. A portion of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31. The other portion of the gas can be diverted through the two first guide channels 304, then pass through the bracket 3 through the multiple gas passages 301 and flow to the second side 312 of the bracket body 31. Finally, it can be discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0254] In the above technical solution, gas entering the first exhaust channel 302 can flow toward both sides of the exhaust hole 313 along the length of the battery cell 10 under the guidance of the two first guide channels 304, achieving instantaneous pressure relief. The gas then passes through the bracket 3 through the multiple gas passages 301 and is ultimately discharged through the explosion-proof valve 6, achieving final pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. During electrolyte injection, the electrolyte can flow under the guidance of the two first guide channels 304, shortening the infiltration time and improving the infiltration efficiency.

[0255] Referring again to FIG. 8 and FIG. 9 , the first abutting portion 321 is configured to be arc-shaped, so that the first abutting portion 321 and the first extending portion 331 define an arc-shaped first guide channel 304 .

[0256] There are two first abutment portions 321, and the two first abutment portions 321 are respectively located on both sides of the exhaust hole 313. The multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the corresponding first abutment portions 321, so that the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide channel 304. In this way, the multiple air channels 301 are all connected to the same first guide channel 304. Under the guidance of the two first guide channels 304, the gas at the first exhaust channel 302 flows to the surrounding areas of the first exhaust channel 302, passes through the multiple air channels 301, and passes through the bracket 3, and can finally be discharged from the explosion-proof valve 6.

[0257] Therefore, in the above technical solution, the first abutting portion 321 is arranged in an arc shape, and the multiple air-passing notches 315 located on the same side of the exhaust hole 313 are arranged circumferentially and spaced apart around the corresponding first abutting portion 321. This can define an arc-shaped first guide channel 304, increase the space occupied by the first guide channel 304, improve the space utilization of the bracket 3, and further enhance the exhaust capacity. In addition, the infiltration time can be further shortened, and the infiltration efficiency can be improved.

[0258] Referring again to Figures 3-4 and 7-8, the frame body 31 defines two through-holes 314 for exposing the positive electrode post 1201 and the negative electrode post 1202 of the battery cell 10. The vent 313 is located between the two through-holes 314. Two first abutting portions 321 are provided in a one-to-one correspondence with the two through-holes 314, and each first abutting portion 321 is disposed around the outer circumference of the corresponding through-hole 314.

[0259] In the above technical solution, on the one hand, the first abutment portion 321 can define an arc-shaped first guide channel 304 with the first extension portion 331, thereby increasing the occupied space of the first guide channel 304, improving the space utilization of the bracket 3, and improving the exhaust capacity. On the other hand, it is arranged around the through hole 314, which can guide the gas at the through hole 314 to flow toward the first exhaust channel 302, so that this part of the gas can pass through the bracket 3 from the exhaust hole 313 as much as possible, further improving the exhaust capacity.

[0260] Please refer to Figures 10 and 11 again. The bracket 3 also includes a second abutment portion 322, which is arranged on the second side 312 of the bracket body 31, and the second abutment portion 322 protrudes in a direction away from the first side 311. The second abutment portion 322 is used to abut against the wall of the shell 11 where the explosion-proof valve 6 is set. The exhaust hole 313 and the wall together form a second exhaust channel 303, and the second exhaust channel 303 is connected to at least one air passage 301.

[0261] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302, part of the gas passes through the bracket 3 from the exhaust hole 313, and the other part of the gas passes through the bracket 3 through the gas channel 301, and finally converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0262] In the above technical solution, a second abutting portion 322 is provided on the second side 312 of the frame body 31, and the second abutting portion 322 abuts against the wall of the shell 11 where the explosion-proof valve 6 is provided, so that a second exhaust channel 303 is defined between the second side 312 of the frame body 31 and the wall of the shell 11, thereby increasing the space occupied by the exhaust path, improving the exhaust capacity, reducing the risk of combustion and explosion of the battery cell 10, reducing the impact on adjacent battery cells 10, and helping to improve the reliability and stability of the battery 100.

[0263] 10 and 11 , a second extension portion 332 is further protruded from the second side 312 of the frame body 31 . The second extension portion 332 and the second abutting portion 322 are spaced apart to form a second guide channel 305 . The second guide channel 305 is used to connect at least one of the air passage 301 and the second air exhaust channel 303 .

[0264] The second guide channel 305 not only increases the space occupied by the exhaust path, thereby improving exhaust capacity, but also serves as a guide. A portion of the gas that passes through the bracket 3 from the gas passage 301 can flow along the second guide channel 305 to the second exhaust channel 303, ultimately being discharged through the explosion-proof valve 6 to achieve pressure relief. This further reduces the risk of combustion and explosion of the battery cell 10 and improves the reliability and stability of the battery 100. Furthermore, the second guide channel 305 guides the flow of electrolyte, further shortening the infiltration time and significantly improving the infiltration efficiency.

[0265] In the length direction of the bracket 3 , there are multiple air passage openings 315 on both sides of the exhaust hole 313 , and the multiple air passage openings 315 on the same side share one second guide channel 305 .

[0266] That is to say, the multiple air gaps 315 can be divided into two parts, and the two parts of the air gaps 315 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. Correspondingly, the number of the second guide channels 305 is two, and the two second guide channels 305 are respectively located on both sides of the exhaust hole 313 in the length direction of the battery cell 10. In the length direction of the battery cell 10, the second guide channel 305 located on one side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions. The second guide channel 305 located on the other side of the exhaust hole 313 is connected with the multiple air gaps 315 at the corresponding positions, so that the second guide channel 305 is connected with the multiple air channels 301 at the corresponding positions.

[0267] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust channel 302. A portion of the gas can pass through the bracket 3 through the exhaust hole 313 and flow to the second side 312 of the bracket body 31. Another portion of the gas can pass through the bracket 3 through multiple gas passages 301 and flow to the second side 312 of the bracket body 31. Then, it flows along the second guide channel 305 and finally converges in the second exhaust channel 303 and is discharged from the explosion-proof valve 6 to achieve rapid pressure relief.

[0268] When injecting liquid, the electrolyte can flow along the second guide channel 305 to the multiple gas gaps 315. The electrolyte passing through the gas gaps 315 can first flow along the second guide channel 304 and then flow toward the electrode assembly 2, or it can flow directly toward the electrode assembly 2, shortening the electrolyte infiltration time and improving the infiltration efficiency.

[0269] In the above technical solution, gas passing through the bracket 3 can be guided by the second flow channel 305 to flow into the second exhaust channel 303, and ultimately discharged through the explosion-proof valve 6, achieving final pressure relief, further reducing the risk of combustion and explosion of the battery cell 10, and improving the reliability and stability of the battery 100. Under the guidance of the second flow channel 305, the electrolyte can flow into the multiple gas holes 315, shortening the infiltration time and improving the infiltration efficiency.

[0270] In some embodiments, the second abutting portion 322 is configured to be arc-shaped, so that the second abutting portion 322 and the second extending portion 332 define an arc-shaped second guide channel 305 .

[0271] There are two second abutment portions 322, which are respectively located on both sides of the exhaust hole 313. The multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged at circumferential intervals around the second abutment portions 322, so that the multiple air gaps 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding second guide channel 305. In this way, the multiple air channels 301 are all connected to the same second guide channel 305. The gas flowing out of the multiple air channels 301 is guided by the second guide channel 305 and converges in the second exhaust channel 303, and can finally be discharged from the explosion-proof valve 6.

[0272] Therefore, in the above technical solution, the second abutting portion 322 is arranged in an arc shape, and the plurality of air-passing notches 315 located on the same side of the exhaust hole 313 are arranged circumferentially and spaced apart around the corresponding second abutting portion 322. This defines an arc-shaped second guide channel 305, thereby increasing the space occupied by the second guide channel 305, improving the space utilization of the bracket 3, and further enhancing the exhaust capacity. Furthermore, the infiltration time can be further shortened, thereby improving the infiltration efficiency.

[0273] Please refer to Figures 3-4 and 10-11 again. The wall of the shell 11 on which the explosion-proof valve 6 is set is also provided with a positive pole 1201 and a negative pole 1202. Two through holes 314 are provided on the frame body 31. The two through holes 314 are used to expose the positive pole 1201 and the negative pole 1202. The exhaust hole 313 is located between the two through holes 314; the two second abutting portions 322 and the two through holes 314 are provided in a one-to-one correspondence, and each second abutting portion 322 is provided around the outer circumference of the corresponding through hole 314.

[0274] In the above technical solution, the second abutment portion 322 can, on the one hand, define an arc-shaped second guide channel 305 with the second extension portion 332, thereby increasing the occupied space of the second guide channel 305, improving the space utilization of the bracket 3, and improving the exhaust capacity. On the other hand, it is arranged around the through hole 314, which can reduce the backflow of gas from the through hole 314.

[0275] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell (10), characterized in that: include: The housing (11) is provided with an explosion-proof valve (6); An electrode assembly (2) is arranged in the housing (11); The bracket (3) comprises a bracket body (31) and a first abutting portion (321), wherein the bracket body (31) has a first side (311) and a second side (312) arranged opposite to each other in the thickness direction thereof, and the bracket body (31) is provided with an exhaust hole (313) penetrating the first side (311) and the second side (312), wherein the exhaust hole (313) is used to be opposite to the explosion-proof valve (6); the first abutting portion (321) is arranged on the first side (311) and protrudes in a direction away from the second side (312), and is used to abut against an end portion of the electrode assembly (2), so that a first exhaust channel (302) is formed between the exhaust hole (313) and the end portion of the electrode assembly (2).

2. The battery cell (10) according to claim 1, characterized in that: The support (3) is provided with an air passage notch (315) penetrating the first side (311) and the second side (312) in the circumferential direction, and the air passage notch (315) and the shell (11) together form an air passage (301), and the air passage (301) is connected to the first exhaust passage (302).

3. The battery cell (10) according to claim 2, characterized in that: The support (3) is provided with a plurality of air passage notches (315) arranged at intervals in the circumferential direction, each of the air passage notches (315) and the shell (11) together form an air passage (301), and the plurality of air passages (301) are arranged around the circumference of the first exhaust passage (302).

4. The battery cell (10) according to claim 2, characterized in that: The first side (311) of the frame body (31) is also provided with a first extension portion (331), the first extension portion (331) is arranged around the circumference of the frame body (31) and defines a matching groove (30) with the frame body (31), and the end of the electrode assembly (2) is arranged in the matching groove (30).

5. The battery cell (10) according to claim 4, characterized in that: The air passage notch (315) is disposed through the first extension portion (331) and the frame body (31).

6. The battery cell (10) according to claim 4, characterized in that: The first extension portion (331) and the first abutment portion (321) are arranged at intervals to form a first flow guiding channel (304) together, and the first flow guiding channel (304) is connected to at least one of the air passages (301) and the first exhaust channel (302).

7. The battery cell (10) according to claim 6, characterized in that: In the length direction of the battery cell (10), the number of the air passage notches (315) on both sides of the exhaust hole (313) is multiple, and the multiple air passage notches (315) located on the same side of the exhaust hole (313) share one first guide channel (304).

8. The battery cell (10) according to claim 7, characterized in that: The first abutting portions (321) are arranged in an arc shape, and there are two of them, which are respectively located on both sides of the exhaust hole (313), and the plurality of air-passing notches (315) located on the same side of the exhaust hole (313) are arranged at intervals in the circumferential direction around the corresponding first abutting portions (321).

9. The battery cell (10) according to claim 8, characterized in that: The wall of the shell (11) on which the explosion-proof valve (6) is arranged is also provided with a positive pole column (1201) and a negative pole column (1202); the frame body (31) is provided with two through holes (314) for exposing the positive pole column (1201) and the negative pole column (1202); and the exhaust hole (313) is located between the two through holes (314); The two first abutting portions (321) and the two through holes (314) are arranged in a one-to-one correspondence, and each of the first abutting portions (321) is arranged around the outer circumference of the corresponding through hole (314).

10. The battery cell (10) according to any one of claims 2 to 9, characterized in that: The second side (312) of the frame body (31) is provided with a second abutment portion (322) protruding in a direction away from the first side (311), and the second abutment portion (322) is used to abut against the wall of the shell (11) on which the explosion-proof valve (6) is arranged, and together form a second exhaust channel (303); the second exhaust channel (303) is connected to at least one of the air passages (301).

11. The battery cell (10) according to claim 10, characterized in that: The second side (312) of the frame body (31) is also provided with a second extension portion (332), the second extension portion (332) and the second abutment portion (322) are arranged at intervals to form a second guide channel (305), and the second guide channel (305) is connected to at least one of the air passages (301) and the second exhaust channel (303).

12. The battery cell (10) according to claim 11, characterized in that: In the length direction of the battery cell (10), the number of the air passage openings (315) on both sides of the exhaust hole (313) is multiple, and the multiple air passage openings (315) located on the same side share one second guide channel (305).

13. The battery cell (10) according to claim 12, characterized in that: The second side (312) has a mounting recess (316) recessed toward the first side (311), the second exhaust passage (303) is defined between the mounting recess (316) and the wall of the shell (11) on which the explosion-proof valve (6) is mounted, and the exhaust hole (313) is disposed on the bottom wall of the mounting recess (316).

14. The battery cell (10) according to claim 13, characterized in that: The side wall of the mounting recess (316) is provided with an air hole (317), and the air hole (317) is connected with the second flow guide channel (305) and the second exhaust channel (303).

15. The battery cell (10) according to claim 12, characterized in that: The second abutting portions (322) are arranged in an arc shape and are two in number, respectively located on both sides of the exhaust hole (313); a plurality of the air-passing notches (315) located on the same side of the exhaust hole (313) are arranged at intervals around the circumference of the corresponding second abutting portions (322).

16. The battery cell (10) according to claim 15, characterized in that: The wall of the shell (11) on which the explosion-proof valve (6) is arranged is also provided with a positive pole column (1201) and a negative pole column (1202); the frame body (31) is provided with two through holes (314) for exposing the positive pole column (1201) and the negative pole column (1202); and the exhaust hole (313) is located between the two through holes (314); The two second abutting portions (322) and the two through holes (314) are arranged in a one-to-one correspondence, and each of the second abutting portions (322) is arranged around the outer circumference of the corresponding through hole (314).

17. The battery cell (10) according to claim 9 or 16, characterized in that: The hole wall of the through hole (314) is provided with a positioning groove for cooperating with the positive electrode column (1201) or the negative electrode column (1202).

18. The battery cell (10) according to any one of claims 2 to 17, characterized in that: The electrode assemblies (2) comprise at least two, the at least two electrode assemblies (2) are stacked and arranged, and at least one of the gas permeation gaps (315) is arranged opposite to the middle position of two adjacent electrode assemblies (2).

19. The battery cell (10) according to any one of claims 1 to 8, characterized in that: The shell (11) is provided with a wall on which the explosion-proof valve (6) is provided, and a pole (12) is at least one of a positive pole (1201) and a negative pole (1202); a through hole (314) for exposing the pole (12) is provided on the frame body (31); and the pole (12) is provided with a receiving portion (121) communicating with the through hole (314); The electrode assembly (2) comprises an active material coating portion (21) and a conductive portion (22) connected to the active material coating portion (21); the bracket (3) supports the end of the active material coating portion (21) where the conductive portion (22) is provided; at least a portion of the conductive portion (22) passes through the through hole (314) and then extends into the accommodating portion (121) to be connected to the pole (12).

20. The battery cell (10) according to claim 19, characterized in that: The accommodating portion (121) comprises a first accommodating groove (12110); the surface of the pole (12) facing the active material coating portion (21) is an inner end face (122) of the pole; a notch of the first accommodating groove (12110) is formed on the inner end face (122) of the pole; and at least a portion of the conductive portion (22) is accommodated in the first accommodating groove (12110).

21. The battery cell (10) according to claim 19, characterized in that: The accommodating portion (121) comprises a second accommodating groove (12120); the surface of the pole (12) away from the active material coating portion (21) is the pole outer end face (123); a notch of the second accommodating groove (12120) is formed on the pole outer end face (123); the second accommodating groove (12120) is connected to the interior of the shell (11) through a through hole (12130); the conductive portion (22) is passed through the through hole (12130) and is at least partially accommodated in the second accommodating groove (12120).

22. The battery cell (10) according to claim 19, characterized in that: The poles (12) include two, namely a positive pole (1201) and a negative pole (1202); the through holes (314) include two, and the two through holes (314) respectively expose the positive pole (1201) and the negative pole (1202).

23. The battery cell (10) according to any one of claims 1 to 22, characterized in that: The battery cell (10) further comprises an insulating member (4), wherein the insulating member (4) is connected to the bracket (3) and is wrapped around the circumference of the electrode assembly (2).

24. A battery (100), characterized in that: The invention comprises a battery cell (10) according to any one of claims 1 to 23.

25. An electrical device (1000), characterized in that: Comprising a battery cell (10) according to any one of Claims 1 to 23; or comprising a battery (100) according to Claim 23.

26. A bracket (3) for a battery cell (10), the battery cell (10) comprising a housing (11) and an electrode assembly (2) arranged in the housing (11), the housing (11) being provided with an explosion-proof valve (6), characterized in that: The support (3) comprises: The frame body (31) has a first side (311) and a second side (312) arranged opposite to each other in the thickness direction thereof, and the frame body (31) is provided with an exhaust hole (313) penetrating the first side (311) and the second side (312), and the exhaust hole (313) is used to be opposite to the explosion-proof valve (6); A first abutment portion (321) is arranged on the first side (311) and protrudes in a direction away from the second side (312), and is used to abut against the end of the electrode assembly (2), so that the exhaust hole (313) and the end of the electrode assembly (2) are spaced apart and together form a first exhaust channel (302).

27. The support (3) according to claim 26, characterized in that The support (3) is provided with an air passage notch (315) penetrating the first side (311) and the second side (312) in the circumferential direction. The air passage notch (315) is used to form an air passage (301) together with the shell (11) so that the air passage (301) is connected with the first exhaust passage (302).

28. The support (3) according to claim 27, characterized in that The first side (311) of the frame body (31) is also provided with a first extension portion (331), which is arranged around the circumference of the frame body (31) and defines a matching groove (30) with the frame body (31) for matching with the end of the electrode assembly (2).

29. The support (3) according to claim 28, characterized in that The first extension portion (331) and the first abutment portion (321) are arranged at intervals to form a first flow guiding channel (304) together, and the first flow guiding channel (304) is used to connect at least one of the air passages (301) and the first exhaust channel (302).

30. The support (3) according to claim 29, characterized in that In the length direction of the bracket (3), the number of the air-passing notches (315) on both sides of the exhaust hole (313) is multiple, and the multiple air-passing notches (315) located on the same side share one first guide channel (304).

31. The support (3) according to claim 30, characterized in that The first abutting portions (321) are arranged in an arc shape, and there are two of them, which are respectively located on both sides of the exhaust hole (313), and the plurality of air-passing notches (315) located on the same side of the exhaust hole (313) are arranged at intervals in the circumferential direction around the corresponding first abutting portions (321).

32. The support (3) according to claim 31, characterized in that The frame body (31) is provided with two through holes (314) for exposing the positive electrode column (1201) and the negative electrode column (1202) of the battery cell (10); The exhaust hole (313) is located between the two through holes (314), the two first abutment portions (321) and the two through holes (314) are arranged in a one-to-one correspondence, and each of the first abutment portions (321) is arranged around the outer circumference of the corresponding through hole (314).

33. The support (3) according to claim 27, characterized in that The support (3) further comprises: A second abutment portion (322) is arranged on the second side (312) and protrudes in a direction away from the first side (311), and is used to abut against a wall of the shell (11) on which the explosion-proof valve (6) is arranged, and a second exhaust channel (303) is formed between the exhaust hole (313) and the wall; the second exhaust channel (303) is connected to at least one of the air passages (301).

34. The support (3) according to claim 33, characterized in that The second side (312) of the frame body (31) is also provided with a second extension portion (332), and the second extension portion (332) and the second abutment portion (322) are arranged at intervals to form a second guide channel (305) together, and the second guide channel (305) is used to connect at least one of the air passages (301) and the second exhaust channel (303).

35. The support (3) according to claim 34, characterized in that In the length direction of the bracket (3), the number of the air-passing notches (315) on both sides of the exhaust hole (313) is multiple, and the multiple air-passing notches (315) located on the same side share one second guide channel (305).

36. The support (3) according to claim 35, characterized in that The second abutting portion (322) is arranged in an arc shape, and there are two of them, which are respectively located on both sides of the exhaust hole (313), and the plurality of air-passing notches (315) located on the same side of the exhaust hole (313) are arranged at intervals around the circumference of the second abutting portion (322).

37. The support (3) according to claim 36, characterized in that The wall of the shell (11) on which the explosion-proof valve (6) is arranged is also provided with a positive pole column (1201) and a negative pole column (1202); the frame body (31) is provided with two through holes (314) for exposing the positive pole column (1201) and the negative pole column (1202); and the exhaust hole (313) is located between the two through holes (314); The two second abutting portions (322) and the two through holes (314) are arranged in a one-to-one correspondence, and each of the second abutting portions (322) is arranged around the outer circumference of the corresponding through hole (314).

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