Battery cells, batteries, electrical devices and supports

Abstract

This application discloses a battery cell, a battery, an electric device, and a support. The battery cell includes a case with an explosion-proof valve, an electrode assembly mounted in the case, and a support including a support body and a first abutment. The support body has a first side and a second side opposite each other, and the support body is provided with an exhaust hole facing the explosion-proof valve. The first abutment is provided on the first side and is adapted to abut against the end of the electrode assembly so as to form a first exhaust passage between the exhaust hole and the end of the electrode assembly. The technical solution of the embodiments of this application improves exhaust capacity, reduces the risk of combustion or explosion of the battery cell, and reduces the impact on adjacent battery cells, which is advantageous for improving the reliability and stability of battery use.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application is filed based on and claims priority from a Chinese patent application with application number 202322215823.3 and filing date August 17, 2023, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of batteries, and in particular to battery cells, batteries, electrical devices and supports. [Background technology]

[0003] Energy conservation and pollutant emission reduction are key to the sustainable development of the automotive industry, and electric vehicles have become an important component of this industry due to their advantages in energy conservation and environmental protection. Battery technology is a key factor in the development of electric vehicles. In terms of related technologies, there is still room for improvement in the reliability of battery cells, which hinders further improvements in battery reliability. Summary of the Invention

[0004] In view of the above problems, the present application provides a battery cell, a battery, and an electric device that are more reliable and advantageous in improving the reliability and stability of battery use.

[0005] In a first aspect, the present application provides a battery cell including a case provided with an explosion-proof valve, an electrode assembly provided in the case, and a support including a support body and a first abutment portion, wherein the support body has a first side and a second side provided opposite each other in the thickness direction thereof, the support body has an exhaust hole penetrating the first side and the second side, the exhaust hole is for facing the explosion-proof valve, and the first abutment portion is provided on the first side and protrudes in a direction opposite to the second side, for abutting against an end of the electrode assembly so that a first exhaust passage is formed between the exhaust hole and the end of the electrode assembly.

[0006] In the technical solution of the embodiment of the present application, a first abutment is provided on a first side of the support body, and the first abutment is abutted against an end of the electrode assembly. This increases the distance between the first side of the support body and the end of the electrode assembly, i.e., the distance between the exhaust hole and the end of the electrode assembly. A first exhaust passage communicating with the exhaust hole is defined between the first side of the support body and the end of the electrode assembly, improving the exhaust capacity. If the battery cell has a tendency toward thermal runaway, the generated gas can first enter the first exhaust passage, then pass through the support body through the exhaust hole, and finally be discharged through the explosion-proof valve, thereby achieving rapid pressure relief. This reduces the risk of combustion or explosion of the battery cell and reduces the impact on adjacent battery cells, which is beneficial to improving the reliability and stability of battery use.

[0007] In some embodiments, a ventilation notch is opened in the circumferential direction of the support, penetrating the first side and the second side, and a ventilation passage is formed between the ventilation notch and the case, and the ventilation passage is connected to the first exhaust passage. In the above technical solution, by providing the ventilation notch in the support, the ventilation notch can define the ventilation passage with the case. On the one hand, gas generated in the circumferential direction of the electrode assembly can quickly move through the corresponding ventilation passage to the explosion-proof valve position, improving the immediacy of pressure release of the explosion-proof valve. At the same time, gas in the first exhaust passage can quickly flow to the exhaust hole and the ventilation passage respectively to achieve instantaneous pressure release, and finally be discharged through the explosion-proof valve to achieve final pressure release, further reducing the risk of combustion or explosion of the battery cell and improving the reliability and stability of the battery. On the other hand, during electrolyte injection, the electrolyte can flow to the electrode assembly through the ventilation notch, shortening the impregnation time and improving impregnation efficiency.

[0008] In some embodiments, the support body has a plurality of vent notches spaced apart around its circumference, each defining a vent passage between the vent notch and the case, and the plurality of vent passages are arranged around the first exhaust passage in a circular fashion. The provision of the plurality of vent notches allows the definition of a plurality of vent passages, allowing some of the gas in the first exhaust passage to diffuse to the surroundings, pass through the support body through the plurality of vent passages, and finally be discharged through the explosion-proof valve, significantly reducing the risk of battery cell combustion or explosion and significantly improving the reliability and stability of the battery. During electrolyte injection, the electrolyte can flow through the plurality of vent notches to the electrode assembly, further shortening the impregnation time and significantly improving impregnation efficiency.

[0009] In some embodiments, a first extending portion is further protruded from the first side of the support body, the first extending portion being annularly formed around the circumferential direction of the support body and defining a fitting groove together with the support body, and an end of the electrode assembly is disposed in the fitting groove. In the above technical solution, the provision of the first extending portion makes it possible to restrain one end of the electrode assembly, thereby improving the stability of the electrode assembly when the battery cell is rocked, reducing the likelihood of the outer layer of the active material-coated portion of the electrode assembly swelling, and protecting the one end of the electrode assembly, thereby reducing the problem of the one end of the electrode assembly touching the case, thereby reducing the phenomenon of the case damaging the electrode assembly and improving the usage reliability of the battery cell.

[0010] In some embodiments, the ventilation notch penetrates the first extension and the support body, and the formed ventilation passage penetrates both sides of the support body in the thickness direction to connect the first exhaust passage and the explosion-proof valve, allowing gas in the first exhaust passage to quickly flow to the exhaust hole and the ventilation passage, respectively, to achieve instantaneous pressure relief, and finally to be discharged through the explosion-proof valve to achieve final pressure relief, further reducing the risk of battery cell combustion and explosion and improving the reliability and stability of the battery.

[0011] In some embodiments, the first extension portion and the first abutting portion are spaced apart to jointly form a first conducting passage, which connects at least one vent passage and the first exhaust passage. The first conducting passage, on the one hand, can expand the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, can serve as a guide, allowing some of the gas entering the first exhaust passage to flow along the first conducting passage to the vent passage, pass through the support through the vent passage, and finally be discharged through the explosion-proof valve to relieve pressure, further reducing the risk of combustion or explosion of the battery cell and improving the reliability and stability of the battery. Furthermore, the first conducting passage can guide the flow of electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0012] In some embodiments, the number of vent notches on both sides of the exhaust hole in the longitudinal direction of the battery cell is multiple, and the multiple vent notches on the same side of the exhaust hole share one first conducting passage. In the above technical solution, gas entering the first exhaust passage is guided by the two first conducting passages to flow to both sides of the exhaust hole in the longitudinal direction of the battery cell, thereby achieving instantaneous pressure relief. It then passes through the multiple vent passages, passes through the support, and is finally discharged through the explosion-proof valve, thereby achieving final pressure relief. This further reduces the risk of battery cell combustion and explosion and improves the reliability and stability of battery use. During electrolyte injection, the electrolyte can flow guided by the two first conducting passages, shortening the impregnation time and improving impregnation efficiency.

[0013] In some embodiments, the first abutment portions are arc-shaped, two in number, and one on each side of the exhaust hole, and the multiple ventilation notches on the same side of the exhaust hole are spaced apart circumferentially around the corresponding first abutment portion. In the above technical solution, the arc-shaped first abutment portions can, on the one hand, reduce the probability that the support body will fail to press against the end of the electrode assembly, and on the other hand, define an arc-shaped first conducting passage with the first extension portion, thereby increasing the space occupied by the first conducting passage and connecting all of the multiple ventilation notches on the same side of the exhaust hole to the first conducting passage, thereby improving the space utilization rate of the support body and the exhaust capacity. Furthermore, the impregnation time can be further shortened, and the impregnation efficiency can be improved.

[0014] In some embodiments, the wall of the case provided with the explosion-proof valve further includes a positive electrode pole and a negative electrode pole, the support body has two through-holes exposing the positive electrode pole and the negative electrode pole, the exhaust hole is located between the two through-holes, the two first abutment portions and the two through-holes are provided in a one-to-one correspondence, and each first abutment portion is provided around the corresponding through-hole in the outer circumferential direction. In the above technical solution, by providing the two through-holes in the support body, the positive electrode pole and the negative electrode pole can be avoided, and the positive electrode pole and the negative electrode pole can be connected to the corresponding conductive part of the electrode assembly. By arranging the first abutment portion around the outer periphery of the corresponding through hole, on the one hand, the first abutment portion and the first extension portion can define a first conduction passage arranged in an arc shape, thereby increasing the space occupied by the first conduction passage, increasing the space utilization rate of the support body and improving the exhaust capacity, and on the other hand, the first abutment portion can guide the gas in the through hole to flow into the first exhaust passage, thereby allowing as much gas in this part as possible to pass through the support body from the exhaust hole, further improving the exhaust capacity.

[0015] In some embodiments, the second side of the support body is provided with a second abutment portion protruding in a direction opposite to the first side, and the second abutment portion abuts against the wall of the case where the explosion-proof valve is provided to jointly form a second exhaust passage, which communicates with at least one ventilation passage. In the above technical solution, by providing the second abutment portion on the second side of the support body and abutting the second abutment against the wall of the case where the explosion-proof valve is provided, a second exhaust passage communicating with the ventilation passage is defined between the second side of the support body and the wall of the case, which increases the space occupied by the exhaust path, improves exhaust capacity, reduces the risk of combustion or explosion of the battery cell, reduces the impact on adjacent battery cells, and is advantageous for improving the reliability and stability of battery use.

[0016] In some embodiments, a second extension portion is further protruded from the second side of the support body, and the second extension portion and the second abutment portion are spaced apart to jointly form a second guide passage that connects at least one vent passage and the second exhaust passage. The second guide passage, on the one hand, can expand the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, can serve as a guide, allowing some of the gas that passes through the support body from the vent passage to flow along the second guide passage to the second exhaust passage and ultimately be discharged through the explosion-proof valve to relieve pressure, further reducing the risk of battery cell combustion or explosion and improving the reliability and stability of the battery. The second guide passage also guides the flow of electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0017] In some embodiments, the number of ventilation notches on both sides of the exhaust hole in the longitudinal direction of the battery cell is multiple, and the multiple ventilation notches on the same side share one second conducting passage. In the above technical solution, the gas passing through the support can be guided by the second conducting passage to flow to the second exhaust passage located in the middle and finally discharged through the explosion-proof valve to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell and improving the reliability and stability of battery use. The electrolyte can be guided by the second conducting passage to flow to the multiple ventilation notches, shortening the impregnation time and improving impregnation efficiency.

[0018] In some embodiments, the second side has a mounting recess recessed into the first side, a second exhaust passage is defined between the mounting recess and the wall of the case where the explosion-proof valve is provided, and an exhaust hole is provided in the bottom wall of the mounting recess. In the above technical solution, by providing the mounting recess on the second side of the support body, the distance between the wall of the case where the explosion-proof valve is provided and the exhaust hole can be increased, which increases the space occupied by the exhaust path, improves the exhaust capacity, further reduces the risk of combustion and explosion of the battery cell, reduces the impact on adjacent battery cells, and is advantageous to improving the reliability and stability of battery use.

[0019] In some embodiments, a vent hole is provided on the side wall of the mounting recess, connecting the second inlet passage and the second exhaust passage. Gas in the second inlet passage can flow through the vent hole to the second exhaust passage and finally be discharged through the explosion-proof valve to relieve pressure. This reduces the risk of combustion or explosion of the battery cell and reduces the impact on adjacent battery cells, which is beneficial to improving the reliability and stability of the battery.

[0020] In some embodiments, the second abutment portions are arc-shaped, two in number, and located on both sides of the exhaust hole, and the multiple ventilation notches located on the same side of the exhaust hole are spaced apart around the circumferential direction of the corresponding second abutment portions. In the above technical solution, by forming the second abutment portions in an arc-shaped manner and providing the multiple ventilation notches located on the same side of the exhaust hole in a spaced apart around the circumferential direction of the corresponding second abutment portions, it is possible to define an arc-shaped second guide passage, increase the space occupied by the second guide passage, improve the space utilization rate of the support, and further improve the exhaust capacity. In addition, it is possible to further shorten the impregnation time and improve the impregnation efficiency.

[0021] In some embodiments, the wall of the case provided with the explosion-proof valve further includes a positive electrode pole and a negative electrode pole, and the support body has two through-holes exposing the positive electrode pole and the negative electrode pole, the exhaust hole is located between the two through-holes, and two second abutting portions and two through-holes are provided in a one-to-one correspondence, with each second abutting portion being provided around the corresponding through-hole. In the above technical solution, the support body has two through-holes, which allow the positive electrode pole and the negative electrode pole to be avoided and the positive electrode pole and the negative electrode pole to be connected to corresponding conductive parts of the electrode assembly. By providing the second abutting portions around the corresponding through-holes, on the one hand, the second abutting portions and the second extending portions define an arc-shaped second conduction passage, which increases the space occupied by the second conduction passage, improving the space utilization rate of the support body and the exhaust capacity, and on the other hand, reduces backflow of gas from the through-holes.

[0022] In some embodiments, the through-hole wall is provided with a positioning groove for fitting with a positive electrode pole or a negative electrode pole, which is advantageous for improving the connection reliability between the positive electrode pole or the negative electrode pole and the support, and the positioning groove can also speed up the flow of the electrolyte, shortening the impregnation time and improving the impregnation efficiency.

[0023] In some embodiments, the electrode assembly includes at least two, and the at least two electrode assemblies are stacked, and at least one ventilation notch is provided opposite the intermediate position of two adjacent electrode assemblies. In the above technical solution, by providing at least one ventilation notch opposite the intermediate position of two adjacent electrode assemblies, gas between the two adjacent electrode assemblies can quickly flow from the first side of the support body through the ventilation notch to the second side of the support body, and then move to the position of the explosion-proof valve, thereby improving the immediacy of pressure release of the explosion-proof valve and improving the reliability and stability of battery use.

[0024] In some embodiments, the wall of the case provided with the explosion-proof valve further includes a pole, the pole being at least one of a positive pole and a negative pole, the support body having a through-hole exposing the pole, the pole having a receiving portion communicating with the through-hole, the electrode assembly including an active material-coated portion and a conductive portion connected to the active material-coated portion, the support being supported by the end of the active material-coated portion where the conductive portion is provided, and at least a portion of the conductive portion extending through the through-hole into the receiving portion and connected to the pole. The hollow structure of the receiving portion in the pole reduces the weight of the pole to some extent, improving the weight-energy density of the battery cell and the battery. The conductive portion can be received in the receiving portion, improving the mounting efficiency of the conductive portion and saving the space occupied by the conductive portion. This fully utilizes the space in the battery cell, providing a tighter and more reliable fit between the support and the pole or between the support and the conductive portion, making the battery cell structure more compact and more advantageous for improving the energy density of the battery cell.

[0025] In some embodiments, the receiving portion includes a first receiving groove, the surface of the electrode post facing the active material coated portion is the electrode post inner end face, the opening of the first receiving groove is formed in the electrode post inner end face, and at least a portion of the conductive portion is received in the first receiving groove. In the above technical solution, on the one hand, by forming the first receiving groove in the electrode post, the weight of the electrode post can be reduced to a certain extent and the weight energy density of the battery cell and battery can be improved. On the other hand, because the opening of the first receiving groove is formed in the electrode post inner end face and the electrode post inner end face is the surface of the electrode post closer to the active material coated portion, the first receiving groove can open toward the active material coated portion, which makes it easier for the conductive portion to extend into the first receiving groove and improves mounting efficiency. In addition, a first receiving groove of this type is easy to process and improves production efficiency.

[0026] In some embodiments, the accommodating portion includes a second accommodating groove, the surface of the pole facing away from the active material application portion is the pole outer end face, the groove opening of the second accommodating groove is formed in the pole outer end face, the second accommodating groove communicates with the inside of the case through a via hole, and the conductive portion is inserted into the via hole and at least partially accommodated in the second accommodating groove. In the above technical solution, on the one hand, by providing the second accommodating groove in the electrode post, the weight of the electrode post can be reduced to a certain extent and the weight energy density of the battery cell and battery can be improved. On the other hand, the groove opening of the second accommodating groove is formed on the outer end surface of the electrode post, and the outer end surface of the electrode post is the surface away from the active material coated portion of the electrode post, so the second accommodating groove can open in the direction opposite to the active material coated portion. In this way, when at least a portion of the conductive portion is accommodated in the second accommodating groove, the conductive portion can be easily accommodated and organized through the groove opening of the second accommodating groove, and operations such as electrical connection between the conductive portion and the electrode post can also be easily realized through the groove opening of the second accommodating groove. This reduces the difficulty of manufacturing the battery cell and improves the production efficiency of battery cells.

[0027] In some embodiments, the electrode assembly includes two poles, one for a positive electrode pole and one for a negative electrode pole, and two through-holes, one for exposing the positive electrode pole and one for the negative electrode pole. During the process of installing the electrode assembly in the case, the two conductive parts of the electrode assembly can pass through the two through-holes on the support simultaneously and separately, which makes it easy to connect the two conductive parts to the positive electrode pole and the negative electrode pole, and is advantageous for improving production efficiency.

[0028] In some embodiments, the battery cell further includes an insulating member connected to the support and wound around the electrode assembly in a circumferential direction. The insulating member can be used to isolate the electrical connection members within the case from the case to reduce the risk of short circuits.

[0029] In a second aspect, the present application provides a battery including the battery cell in the above embodiment.

[0030] In the technical solutions of the embodiments of the present application, the use of the above-mentioned battery cells can reduce the risk of combustion or explosion of the battery cells and reduce the impact on adjacent battery cells, which is advantageous in improving the reliability and stability of battery use.

[0031] In a third aspect, the present application provides an electric device including a battery cell according to any of the above embodiments, or including a battery according to any of the above embodiments.

[0032] In the technical solution of the embodiment of the present application, the use of the above battery is advantageous to improve the reliability and stability of the use of the electrical device.

[0033] In a fourth aspect, the present application provides a support for a battery cell, the support comprising a case provided with an explosion-proof valve and an electrode assembly provided in the case, the support comprising a support body and a first abutment portion, the support body having a first side and a second side provided opposite each other in the thickness direction thereof, the support body having an exhaust hole penetrating the first side and the second side, the exhaust hole facing the explosion-proof valve, the first abutment portion provided on the first side and protruding in a direction opposite to the second side, the first abutment portion being provided on the first side and protruding in a direction opposite to the second side, and for abutting against an end of the electrode assembly such that the exhaust hole and the end of the electrode assembly are spaced apart and jointly form a first exhaust passage.

[0034] In the technical solution of the embodiment of the present application, a first abutment is provided on a first side of the support body, and the first abutment is abutted against an end of the electrode assembly. This increases the distance between the first side of the support body and the end of the electrode assembly, i.e., the distance between the exhaust hole and the end of the electrode assembly. A first exhaust passage communicating with the exhaust hole is defined between the first side of the support body and the end of the electrode assembly, improving the exhaust capacity. If the battery cell has a tendency toward thermal runaway, the generated gas can first enter the first exhaust passage, then pass through the support body through the exhaust hole, and finally be discharged through the explosion-proof valve, thereby achieving rapid pressure relief. This reduces the risk of combustion or explosion of the battery cell and reduces the impact on adjacent battery cells, which is beneficial to improving the reliability and stability of battery use.

[0035] In some embodiments, a ventilation notch is formed in the circumferential direction of the support, penetrating the first and second sides, to form a ventilation passage between the support and the case and to connect the ventilation passage to the first exhaust passage. The provision of the ventilation notch in the support allows the ventilation notch to define the ventilation passage between the support and the case. This allows gas generated in the circumferential direction of the electrode assembly to quickly move through the corresponding ventilation passage to the explosion-proof valve, improving the speed of pressure release for the explosion-proof valve. The gas in the first exhaust passage quickly flows to the exhaust hole and the ventilation passage, respectively, to achieve instantaneous pressure relief, and finally discharges through the explosion-proof valve to achieve final pressure relief. This further reduces the risk of battery cell combustion and explosion and improves the reliability and stability of the battery. Furthermore, during electrolyte injection, the electrolyte can flow through the ventilation notch to the electrode assembly, shortening the impregnation time and improving impregnation efficiency.

[0036] In some embodiments, the first side of the support body further includes a first extending portion that is protruded, the first extending portion being annularly formed around the support body in the circumferential direction and defining a fitting groove for fitting the support body with an end of the electrode assembly. In the above technical solution, the provision of the first extending portion makes it possible to restrain one end of the electrode assembly, reducing the possibility of swelling of the outer layer of the active material-coated portion of the electrode assembly, and protecting the one end of the electrode assembly, thereby reducing the problem of the one end of the electrode assembly touching the case, thereby reducing the phenomenon of the case damaging the electrode assembly and improving the usage reliability of the battery cell.

[0037] In some embodiments, the first extension portion and the first abutment portion are spaced apart and jointly form a first conduction passage, the first conduction passage being for communicating at least one ventilation passage with the first exhaust passage.

[0038] The first conduction passage, on the one hand, expands the space occupied by the exhaust path, which is beneficial for improving exhaust capacity, and on the other hand, it acts as a guide, allowing some of the gas that enters the first exhaust passage to flow along the first conduction passage to the vent passage, through the vent passage, past the support, and finally discharged through the explosion-proof valve to relieve pressure, further reducing the risk of battery cell combustion or explosion and improving the reliability and stability of battery use. The first conduction passage also guides the flow of electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0039] In some embodiments, the number of vent notches on both sides of the exhaust hole in the longitudinal direction of the support is multiple, and the multiple vent notches on the same side share one first conducting passage. In the above technical solution, gas entering the first exhaust passage is guided by the two first conducting passages to flow to both sides of the exhaust hole in the longitudinal direction of the battery cell, thereby achieving instantaneous pressure relief. It then passes through the support through the multiple vent passages and finally is discharged through the explosion-proof valve, thereby achieving final pressure relief. This further reduces the risk of battery cell combustion and explosion and improves the reliability and stability of battery use. During electrolyte injection, the electrolyte can flow guided by the two first conducting passages, shortening the impregnation time and improving impregnation efficiency.

[0040] In some embodiments, the first abutment portions are arc-shaped, there are two of them, and they are located on both sides of the exhaust hole, and the multiple ventilation notches located on the same side of the exhaust hole are spaced apart around the circumferential direction of the corresponding first abutment portions. In the above technical solution, by forming the first abutment portions in an arc-shaped manner and providing the multiple ventilation notches located on the same side of the exhaust hole in a spaced apart around the circumferential direction of the corresponding first abutment portions, it is possible to define an arc-shaped first flow guide passage, which increases the space occupied by the first flow guide passage, improves the space utilization rate of the support, and further improves the exhaust capacity. In addition, it is possible to further shorten the impregnation time and improve the impregnation efficiency.

[0041] In some embodiments, the support body has two through holes for exposing the positive and negative poles of the battery cells, the exhaust hole is located between the two through holes, the 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 periphery of the corresponding through hole. In the above technical solution, on the one hand, the first abutting portion can define an arc-shaped first conduction passage with the first extension portion, increasing the space occupied by the first conduction passage, thereby increasing the space utilization rate of the support body and improving the exhaust capacity. On the other hand, by being provided around the through hole, the first abutting portion can guide gas in the through hole to flow into the first exhaust passage, allowing as much gas as possible to pass through the support body from the exhaust hole, further improving the exhaust capacity.

[0042] In some embodiments, the support further includes a second abutment portion on the second side, protruding in a direction opposite to the first side, for abutting against the wall of the case where the explosion-proof valve is provided, thereby forming a second exhaust passage between the exhaust hole and the wall. The second exhaust passage communicates with at least one ventilation passage. In the above technical solution, by providing a second abutment portion on the second side of the support body and abutting the second abutment against the wall of the case where the explosion-proof valve is provided, a second exhaust passage communicating with the ventilation passage is defined between the second side of the support body and the wall of the case, which increases the space occupied by the exhaust path, improves exhaust capacity, reduces the risk of combustion or explosion of the battery cell, reduces the impact on adjacent battery cells, and is advantageous for improving the reliability and stability of battery use.

[0043] In some embodiments, a second extension portion is further protruded from the second side of the support body, and the second extension portion and the second abutment portion are spaced apart to jointly form a second guide passage that connects at least one vent passage and the second exhaust passage. The second guide passage, on the one hand, can expand the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, can serve as a guide, allowing some of the gas that passes through the support body from the vent passage to flow along the second guide passage to the second exhaust passage and ultimately be discharged through the explosion-proof valve to relieve pressure, further reducing the risk of battery cell combustion or explosion and improving the reliability and stability of the battery. The second guide passage also guides the flow of electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0044] In some embodiments, the number of ventilation notches on both sides of the exhaust hole in the longitudinal direction of the support is multiple, and multiple ventilation notches on the same side share one second conducting passage. In the above technical solution, the gas passing through the support can be guided by the second conducting passage to flow to the second exhaust passage and finally discharged through the explosion-proof valve to achieve final pressure relief, further reducing the risk of battery cell combustion and explosion and improving the reliability and stability of battery use. The electrolyte can be guided by the second conducting passage to flow to multiple ventilation notches, shortening the impregnation time and improving impregnation efficiency.

[0045] In some embodiments, the second abutment portions are arc-shaped, there are two of them, one on each side of the exhaust hole, and the multiple ventilation notches on the same side of the exhaust hole are spaced apart around the circumferential direction of the second abutment portions. In the above technical solution, by forming the second abutment portions in an arc-shaped manner and providing the multiple ventilation notches on the same side of the exhaust hole in a spaced apart manner around the circumferential direction of the corresponding second abutment portions, it is possible to define an arc-shaped second flow guide passage, which increases the space occupied by the second flow guide passage, improves the space utilization rate of the support, and further improves the exhaust capacity. In addition, it is possible to further shorten the impregnation time and improve the impregnation efficiency.

[0046] In some embodiments, the wall of the case where the explosion-proof valve is provided further includes a positive electrode pole and a negative electrode pole, the support body has two through-holes exposing the positive electrode pole and the negative electrode pole, 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 corresponding through-hole. In the above technical solution, on the one hand, the second abutting portion can define an arc-shaped second guide passage with the second extension portion, which increases the space occupied by the second guide passage, improves the space utilization rate of the support body, and enhances the exhaust capacity, and on the other hand, the second abutting portion is provided around the through-hole, which reduces backflow of gas from the through-hole.

[0047] The above description is merely a brief description of the technical solution of the present application. In order to make the technical solution of the present application more clearly understood and implemented according to the contents of the specification, and to make the above and other objectives, features and advantages of the present application more comprehensible, specific embodiments of the present application are given below. [Brief explanation of the drawings]

[0048] Various other benefits and advantages will become apparent to those skilled in the art upon review of the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and should not be construed as limiting the present application. Furthermore, like reference numerals refer to like elements throughout the drawings. A description of the drawings follows. [Figure 1] 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application. [Figure 2] FIG. 1 is an exploded view of the structure of a battery provided in some embodiments of the present application. [Figure 3] FIG. 1 is a perspective view of a battery cell provided in some embodiments of the present application. [Figure 4] 1 is a structural cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 5]1 is a structural cross-sectional view of a battery cell provided in some embodiments of the present application. [Figure 6] FIG. 6 is a partially enlarged view of the battery cell shown in FIG. [Figure 7] FIG. 2 is an assembly diagram of an electrode assembly and a support of a battery cell provided in some embodiments of the present application. [Figure 8] FIG. 2 is a structural schematic diagram of a support for a battery cell provided in some embodiments of the present application from one perspective. [Figure 9] FIG. 9 is a partial enlarged view of the support shown in FIG. 8. [Figure 10] FIG. 2 is a structural schematic diagram of a support for a battery cell provided in some embodiments of the present application from another perspective. [Figure 11] FIG. 11 is a partially enlarged view of the support shown in FIG. [Figure 12] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. [Figure 13] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. [Figure 14] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. [Figure 15] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. [Figure 16] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. [Figure 17] 1 is a partial cross-sectional schematic view of a battery cell provided in some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0049] Hereinafter, the embodiments of the technical solution of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly explain the technical solution of the present application, and are merely examples, which should not limit the protection scope of the present application.

[0050] 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 pertains. The terms used herein are merely for the purpose of describing specific examples and are not intended to limit this application. The terms "comprises," "having," and any variations thereof in the specification, claims, and description of the drawings of this application are intended to be non-exclusive.

[0051] In the description of the examples of this application, technical terms such as "first," "second," etc. are merely used to distinguish different objects, and should not be understood as indicating or implying relative importance, or implying the number, specific order, or primary and secondary relationship of the technical features shown. In the description of the examples of this application, unless otherwise clearly and specifically limited, "plurality" means two or more.

[0052] When an "embodiment" is described in this specification, it means that a particular feature, structure, or characteristic described by the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to an embodiment that is exclusively independent of or alternative to other embodiments. It is explicitly or implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] In the description of the examples of this application, the term "and / or" is merely used to explain the relationship between related objects and indicates that there may be three relationships; for example, A and / or B can represent the cases where A exists alone, A and B exist simultaneously, or B exists alone. In addition, the symbol " / " in this specification generally means that the related objects before and after it are in an "or" relationship.

[0054] In describing the examples of this application, the term "plurality" refers to two or more (including two); similarly, "sets" refers to two or more (including two sets), and "plurality" refers to two or more (including two).

[0055] In describing the embodiments of the present application, orientations or positional relationships indicated by technical terms such as "center," "longitudinal direction," "lateral direction," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial direction," "radial direction," and "circumferential direction" are orientations or positional relationships shown based on the drawings, and are intended merely to facilitate explanation of the embodiments of the present application and simplify the description. They do not explicitly or implicitly indicate that the indicated devices or elements necessarily have a specific orientation, or are configured and operated in a specific orientation, and therefore should not be understood as limiting the embodiments of the present application.

[0056] In describing the embodiments of the present application, unless otherwise clearly defined or limited, the terms "attach," "couple," "connect," "fix," etc. should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection. They may be mechanical or electrical connections. They may be direct connections, indirect connections via an intermediate medium, or internal communication between two elements or an interactive relationship between two elements. Those skilled in the art will be able to understand the specific meanings of the above terms in this specification according to specific circumstances.

[0057] Currently, in view of the development of the market situation, the applications of power batteries are expanding. Power batteries are not only widely used in energy storage power supply systems such as hydroelectric power, thermal power, wind power and solar power plants, but also in various fields such as electric transportation means such as electric bicycles, electric motorcycles and electric cars, military equipment and aerospace. With the expansion of the application fields of power batteries, the market demand is also increasing.

[0058] In the battery cell of the related art, an explosion-proof sheet is provided in the center of the lower plastic member, and a concave cavity is provided below the explosion-proof sheet toward the electrode assembly, and multiple sets of grid holes are drilled on the bottom surface of the concave cavity, which allows the explosion-proof sheet of the lithium battery to directly communicate with the internal space of the lithium battery, allowing the explosion-proof sheet to sensitively sense the pressure in the internal space of the lithium battery. However, because the grid holes are close to the electrode assembly, the exhaust speed is slow, which affects the exhaust capacity and seriously affects the reliability of the battery cell.

[0059] In order to improve the reliability of the battery cell, the present application provides a first abutment portion on the side of the support body facing the electrode assembly, and defines a first exhaust passage communicating with the exhaust hole between the exhaust hole and the end of the electrode assembly, thereby improving exhaust capacity, reducing the risk of combustion or explosion of the battery cell, and reducing the impact on adjacent battery cells, which is advantageous for improving the reliability and stability of battery use.

[0060] The battery cells disclosed in the embodiments of the present application can be used in various electric devices that use batteries as a power source or energy storage systems that use batteries as an energy storage element. The electric devices may be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric motorcycles, electric cars, boats, aircraft, etc. Here, the electric toys may include, for example, game consoles, electric car toys, electric boat toys, and electric plane toys, and other stationary or mobile electric toys, and the aircraft may include airplanes, rockets, space shuttles, spaceships, etc.

[0061] For convenience of explanation, the following embodiment will be described by taking a vehicle as an example of the electric device 1000 according to an embodiment of the present application.

[0062] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle provided in some embodiments of the present application. The vehicle may be a fuel vehicle, a natural gas vehicle, or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extender vehicle, etc. A battery 100 is provided inside the vehicle, and may be provided at the bottom, front, or rear of the vehicle. The battery 100 is used to supply power to the vehicle, for example, the battery 100 can be the operating power source for the vehicle. The vehicle may further include a controller 200 and a motor 300, where the controller 200 controls the battery 100 to supply power to the motor 300, for example, for vehicle startup, navigation, and running power needs during driving.

[0063] In some embodiments of the present application, the battery 100 not only serves as a power source for operating the vehicle, but also as a power source for driving the vehicle, replacing all or part of gasoline or natural gas, to provide driving power to the vehicle.

[0064] Referring to FIG. 2, FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 20 and battery cells 10 housed in the box 20. The box 20 provides a storage space for the battery cells 10 and may have various structures. In some embodiments, the box 20 may include a first portion 201 and a second portion 202 that, when stacked together, define a storage space for housing the battery cells 10. The second portion 202 may have a hollow structure with an open end, and the first portion 201 may have a plate-like structure. The first portion 201 may be stacked on the open side of the second portion 202, thereby defining the storage space. The first portion 201 and the second portion 202 may both have a hollow structure with an open end, and the open side of the first portion 201 may be stacked on the open side of the second portion 202. Of course, the box 20 formed by the first portion 201 and the second portion 202 may have various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, or the like.

[0065] The battery 100 may include a plurality of battery cells 10, and the plurality of battery cells 10 may be connected in series, parallel, or a mixed connection. A mixed connection refers to a plurality of battery cells 10 connected both in series and in parallel. The plurality of battery cells 10 may be directly connected in series, parallel, or a mixed connection, and then the entirety of the plurality of battery cells 10 may be housed in the box 20. Of course, the battery 100 may also be formed by connecting the plurality of battery cells 10 in series, parallel, or a mixed connection to form a battery 100 module, and then integrating the plurality of battery 100 modules in series, parallel, or a mixed connection and housing them in the box 20. The battery 100 may further include other structures, for example, the battery 100 may further include a current collecting member for realizing electrical connection between the plurality of battery cells 10.

[0066] Here, each battery cell 10 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 10 may be cylindrical, flat, rectangular, or have other shapes.

[0067] 3 and 4, FIG. 3 is a schematic exploded view of a battery cell 10 provided in some embodiments of the present application. FIG. 4 is a cross-sectional view of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 refers to the smallest structural unit of a battery 100. The battery cell 10 includes a case 11, an electrode assembly 2, and a support 3. As shown in FIGS. 3 and 4, the case 11 may be provided with an explosion-proof valve 6 for releasing internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold. Here, the case 11 may include a case body 111 and a case cover 112. The explosion-proof valve 6 may be provided in the case cover 112 or in the case body 111.

[0068] The case cover 112 is a member that fits over the opening 1110 of the case body 111 and isolates the internal environment of the battery cell 10 from the external environment. The shape of the case cover 112 may be adapted to match the shape of the case body 111, but is not limited thereto. Optionally, the case cover 112 may be made of a material (e.g., aluminum alloy) with a certain degree of hardness and strength so as to be resistant to deformation when pressed or hit. This can provide the battery cell 10 with higher structural strength and improve reliability to a certain extent. The case cover 112 may be provided with functional members such as electrode terminals. The electrode terminals are electrically connected to the electrode assembly 2 and can be used to output or input electrical energy to the battery cell 10. The case cover 112 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, or plastic, but is not particularly limited thereto in the embodiments of the present application.

[0069] The case body 111, together with the case cover 112, is a component for forming the internal environment of the battery cell 10, and the internal environment formed thereby can be used to accommodate the electrode assembly 2, electrolyte, and other components. The case body 111 and the case cover 112 may be independent components, or an opening 1110 may be formed in the case body 111, and the case cover 112 may be placed over the opening 1110 to form the internal environment of the battery cell 10. The case cover 112 and the case body 111 may be integrated, but are not limited to this. Specifically, before other components are enclosed, a common connection surface may be formed between the case cover 112 and the case body 111, and when it is necessary to seal the interior of the case body 111, the case cover 112 may be placed over the case body 111. The case body 111 may have various shapes and sizes, such as a rectangular parallelepiped, cylindrical, or hexagonal prism. Specifically, the shape of the case body 111 may be determined according to the specific shape and size of the electrode assembly 2. The case body 111 may be made of various materials such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., but is not particularly limited thereto in the embodiments of the present application.

[0070] The electrode assembly 2 is a component that undergoes an electrochemical reaction in the battery cell 10. The case 11 may contain one or more electrode assemblies 2. The electrode assembly 2 is typically formed by winding or stacking a positive electrode sheet and a negative electrode sheet, with a separator typically being provided between the positive electrode sheet and the negative electrode sheet. The portions of the positive electrode sheet and the negative electrode sheet that contain active material form the main body of the electrode assembly 2, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material form tabs, respectively. The positive electrode tab and the negative electrode tab may be located at the same end of the main body, or may be located at opposite ends of the main body. During charging and discharging of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current circuit.

[0071] Please refer to Fig. 4, and further to Figs. 5 and 6. Fig. 5 is a structural cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Fig. 6 is a partially enlarged view of the battery cell 10 shown in Fig. 5. The support body 3 includes a support body 31, which has a first side 311 and a second side 312. The first side 311 and the second side 312 are opposite each other in the thickness direction of the support body 31 (the Z direction shown in Fig. 6). An exhaust hole 313 is opened in the support body 31. The exhaust hole 313 penetrates the first side 311 and the second side 312 of the support body 31. The exhaust hole 313 faces the explosion-proof valve 6.

[0072] The support body 3 further includes a first abutment portion 321, which is provided on the first side 311 of the support body 31 and protrudes in a direction opposite to the second side 312 of the support body 31, and which abuts against the end of the electrode assembly 2 so that a first exhaust passage 302 is formed between the exhaust hole 313 and the end of the electrode assembly 2.

[0073] Here, "the first abutment portion 321 abuts against the end portion of the electrode assembly 2" means that when the first abutment portion 321 contacts and fits with the end portion of the electrode assembly 2, and the support body 3 is positioned above the electrode assembly 2, the end portion of the electrode assembly 2 can support the support body 3, and when the support body 3 is positioned below the electrode assembly 2, the support body 3 can support the electrode assembly 2.

[0074] The fact that the first abutment portion 321 is provided on the first side 311 of the support body 31 specifically means that the first abutment portion 321 is provided on the side of the support body 31 facing the end of the electrode assembly 2, and since the first abutment portion 321 abuts against the end of the electrode assembly 2, the first side 311 of the support body 31 is positioned away from the end of the electrode assembly 2, a first exhaust passage 302 is defined between the first side 311 of the support body 31 and the end of the electrode assembly 2, and the exhaust hole 313 connects the first exhaust passage 302 to the explosion-proof valve 6.

[0075] In the technical solution of the embodiment of the present application, a first abutment portion 321 is provided on the first side 311 of the support body 31, and the first abutment portion 321 abuts against the end of the electrode assembly 2. This increases the distance between the first side 311 of the support body 31 and the end of the electrode assembly 2, i.e., the distance between the exhaust hole 313 and the end of the electrode assembly 2. This defines a first exhaust passage 302, which communicates with the exhaust hole 313, between the first side 311 of the support body 31 and the end of the electrode assembly 2, improving exhaust capacity. If the battery cell 10 experiences thermal runaway, the generated gas can enter the first exhaust passage 302, then pass through the exhaust hole 313 to the support 3, and finally be discharged through the explosion-proof valve 6, thereby achieving rapid pressure relief. This reduces the risk of combustion or explosion of the battery cell 10 and reduces the impact on adjacent battery cells 10, which is beneficial to improving the reliability and stability of the battery 100.

[0076] 5 and 6 again, and further to FIG. 7, which is an assembly diagram of the electrode assembly 2 and the support 3 of the battery cell 10 provided in some embodiments of the present application. In FIG. 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 support 3 is provided at one end of the electrode assembly 2 in the height direction.

[0077] A ventilation notch 315 is opened in the circumferential direction of the support body 3, penetrating the first side 311 and the second side 312 of the support body main body 31, and the support body 3 is fitted with the case 11 in the circumferential direction so that a ventilation passage 301 is formed between the ventilation notch 315 and the case 11, and the ventilation passage 301 is connected to the first exhaust passage 302.

[0078] Here, the notch refers to a gap formed by a cutout on the edge of the structure. The ventilation notch 315 in the embodiment of the present application refers to a ventilation gap formed by a cutout in the circumferential direction of the support body 3. When the support body 3 is fitted with the case 11, the case 11 can close the opening of the ventilation notch 315 to define the ventilation passage 301.

[0079] If the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, some of the gas can pass through the exhaust hole 313 and the support 3, and other part of the gas can pass through the ventilation passage 301 and the support 3, and finally be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0080] In the above technical solution, the support 3 is provided with the ventilation notches 315, which define the casing 11 and the ventilation passages 301. On the one hand, gas generated around the electrode assembly 2 can quickly move through the corresponding ventilation passages 301 to the position of the explosion-proof valve 6, improving the immediacy of pressure release of the explosion-proof valve 6. At the same time, the gas in the first exhaust passage 302 can quickly flow to the exhaust hole 313 and the ventilation passage 301, respectively, to achieve instantaneous pressure relief, and finally be discharged through the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of the battery 100. On the other hand, during electrolyte injection, the electrolyte can flow through the ventilation notches 315 to the electrode assembly 2, shortening the impregnation time and improving impregnation efficiency.

[0081] Referring again to FIG. 7, a plurality of ventilation notches 315 are formed in the support body 3 and spaced apart in the circumferential direction. For example, the plurality of ventilation notches 315 may be uniformly distributed in the circumferential direction of the support body 3, or the plurality of ventilation notches 315 may be concentrated and distributed at a local position in the circumferential direction of the support body 3. One ventilation passage 301 is formed between each ventilation notch 315 and the case 11, and the plurality of ventilation passages 301 are arranged in a circular pattern around the circumferential direction of the first exhaust passage 302.

[0082] As a result, by providing multiple ventilation notches 315, multiple ventilation passages 301 can be defined, and some of the gas in the first exhaust passage 302 can diffuse to the surroundings and pass through the multiple ventilation passages 301 to the support 3, and finally be discharged through the explosion-proof valve 6, greatly reducing the risk of combustion or explosion of the battery cell 10 and greatly improving the reliability and stability of use of the battery 100. During electrolyte injection, the electrolyte can flow into the electrode assembly 2 through the multiple ventilation notches 315, further shortening the impregnation time and significantly improving impregnation efficiency.

[0083] Referring again to Fig. 7 and further to Figs. 8 and 9, Fig. 8 is a structural schematic diagram of one perspective of the support body 3 of the battery cell 10 provided in some embodiments of the present application. Fig. 9 is a partial enlarged view of the support body 3 shown in Fig. 8. A first extension portion 331 is further protruded from the first side 311 of the support body 31, and the first extension portion 331 is annularly formed around the circumferential direction of the support body 31, and the first extension portion 331 and the support body 31 define a fitting groove 30, and an end of the electrode assembly 2 is disposed within the fitting groove 30.

[0084] That is, the support body 31 is provided at the end of the electrode assembly 2, and the first extension portion 331 is provided on the peripheral edge side of the electrode assembly 2. It should be noted that the support body 3 and the electrode assembly 2 may be assembled and then installed together in the case 11, or the support body 3 may be attached to the case 11 in advance, and then the electrode assembly 2 may be installed in the case 11 and fitted with the support body 3.

[0085] In an embodiment in which the support body 3 and the electrode assembly 2 are assembled and then mounted together in the case 11, the first extension 331 can protect the electrode assembly 2 during the mounting process, reducing the likelihood of the electrode assembly 2 coming into contact with the case 11 and further reducing the possibility of the case 11 damaging the electrode assembly 2, thereby reducing the likelihood of the active material of the electrode assembly 2 falling off, preventing to some extent an internal short circuit caused by the fallen active material overlapping with sheets of opposite polarity, and preventing to some extent corrosion or penetration of the case 11 due to a chemical reaction between the fallen active material and the case 11, thereby improving the reliability of use of the battery cell 10. Furthermore, the first extension 331 and the electrode assembly 2 can be locked together, preventing to some extent the fall-off of the support body 3 before mounting in the case and improving the production yield of the battery cell 10. After being installed in the case, the first extension portion 331 can restrain one end of the electrode assembly 2, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 swelling. In addition, the one end of the electrode assembly 2 is protected, reducing the problem of the one end of the electrode assembly 2 coming into contact with the case 11. This reduces the phenomenon in which the case 11 damages the electrode assembly 2, and improves the reliability of use of the battery cell 10.

[0086] In an embodiment in which the support 3 is attached to the case 11 in advance and then the electrode assembly 2 is installed inside the case 11, the first extension portion 331 can restrain one end of the electrode assembly 2, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 swelling. In addition, the one end of the electrode assembly 2 is protected, reducing the problem of the one end of the electrode assembly 2 coming into contact with the case 11. This reduces the phenomenon in which the case 11 damages the electrode assembly 2, and improves the reliability of use of the battery cell 10.

[0087] Therefore, in the above technical solution, by providing the first extension portion 331, one end of the electrode assembly 2 can be restrained, improving the stability of the electrode assembly 2 when the battery cell 10 is swung, reducing the probability of the outer layer of the active material coated portion 21 of the electrode assembly 2 swelling, and protecting the one end of the electrode assembly 2, reducing the problem of the one end of the electrode assembly 2 coming into contact with the case 11, thereby reducing the phenomenon of the case 11 damaging the electrode assembly 2 and improving the reliability of use of the battery cell 10.

[0088] Here, the ventilation notch 315 is provided to penetrate the first extension portion 331 and the support body 31. The formed ventilation passage 301 penetrates both sides of the support body 3 in the thickness direction and connects the first exhaust passage 302 to the explosion-proof valve 6, so that gas in the first exhaust passage 302 can quickly flow to the exhaust hole 313 and the ventilation passage 301, respectively, to achieve instantaneous pressure relief, and is finally discharged through the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of the battery 100.

[0089] Referring again to Figure 9, the first extension portion 331 and the first abutment portion 321 are spaced apart, and the first extension portion 331 and the first abutment portion 321 together form the first guide passage 304, which connects at least one ventilation passage 301 and the first exhaust passage 302.

[0090] On the one hand, the first guide passage 304 can expand the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, it can act as a guide, allowing some of the gas that has entered the first exhaust passage 302 to flow along the first guide passage 304 to the vent passage 301. The gas then passes through the vent passage 301, passes through the support 3, and is finally discharged through the explosion-proof valve 6, thereby realizing pressure relief. This further reduces the risk of combustion or explosion of the battery cell 10 and improves the reliability and stability of use of the battery 100. In addition, the first guide passage 304 can guide the flow of the electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0091] Here, in the longitudinal direction of the battery cell 10 (the X direction in the figure), there are multiple ventilation notches 315 on both sides of the exhaust hole 313, and the multiple ventilation notches 315 located on the same side of the exhaust hole 313 share one first conduction passage 304.

[0092] That is, the plurality of ventilation notches 315 can be divided into two parts, and the ventilation notches 315 of the two parts are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. Accordingly, the number of first conduction passages 304 is two, and the two first conduction passages 304 are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. In the longitudinal direction of the battery cell 10, the first conduction passage 304 located on one side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions. Meanwhile, the first conduction passage 304 located on the other side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions.

[0093] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas can pass through the exhaust hole 313, pass through the support 3, and flow to the second side 312 of the support body 31; the other part of the gas can be diverted by the two first guide passages 304, and then pass through the multiple ventilation passages 301, pass through the support 3, and flow to the second side 312 of the support body 31, and finally be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0094] In the above technical solution, the gas that enters the first exhaust passage 302 is guided by the two first guide passages 304 to flow to both sides of the exhaust hole 313 in the longitudinal direction of the battery cell 10, thereby achieving instantaneous pressure relief, and then passes through the multiple vent passages 301, passes through the support 3, and is finally discharged through the explosion-proof valve 6, thereby achieving final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. During electrolyte injection, the electrolyte can flow guided by the two first guide passages 304, shortening the impregnation time and improving impregnation efficiency.

[0095] 8 and 9, the first abutment portion 321 is formed in an arc shape, and the first abutment portion 321 and the first extension portion 331 define an arc-shaped first conduction passage 304, which reduces the contact area between the support 3 and the end of the electrode assembly 2 and reduces the probability that the support 3 will fail to press against the end of the electrode assembly 2.

[0096] The number of first contact portions 321 is two, and the two first contact portions 321 are located on either side of the exhaust hole 313. For example, the two first contact portions 321 are each formed as an arc-shaped plate, and both ends of each arc-shaped plate are spaced apart and are provided facing the exhaust hole 313.

[0097] Here, the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged circumferentially around the corresponding first abutment portion 321 and spaced apart, and the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide passage 304. In this way, the multiple ventilation passages 301 are all connected to the same first guide passage 304, and the gas in the first exhaust passage 302 flows around the first exhaust passage 302 under the guidance of the two first guide passages 304, passes through the multiple ventilation passages 301, passes through the support 3, and can finally be discharged from the explosion-proof valve 6.

[0098] Therefore, in the above technical solution, by forming the first abutting portion 321 in an arc shape, on the one hand, it is possible to reduce the probability that the support body 3 will fail to press against the end of the electrode assembly 2, and on the other hand, it is possible to define the first guide passage 304 in an arc shape together with the first extending portion 331, thereby increasing the space occupied by the first guide passage 304 and connecting all of the multiple ventilation notches 315 located on the same side of the exhaust hole 313 to the first guide passage 304, thereby improving the space utilization rate of the support body 3 and the exhaust capacity.In addition, it is possible to further shorten the impregnation time and improve the impregnation efficiency.

[0099] 3-4 and 7-8, the wall of the case 11 on which the explosion-proof valve 6 is provided is further provided with a positive electrode pole 1201 and a negative electrode pole 1202, the support body 31 is formed with two through holes 314 for exposing the positive electrode pole 1201 and the negative electrode pole 1202, the exhaust hole 313 is located between the two through holes 314, the two first contact portions 321 and the two through holes 314 are provided in a one-to-one correspondence, and each first contact portion 321 is provided around the outer periphery of the corresponding through hole 314. In other words, the first contact portion 321 forms an arc-shaped structure that is provided around the outer periphery of the corresponding through hole 314.

[0100] In the above technical solution, by providing two through holes 314 in the support body 31, the positive electrode pole 1201 and the negative electrode pole 1202 can be avoided, and the positive electrode pole 1201 and the negative electrode pole 1202 can be connected to the corresponding conductive part 22 of the electrode assembly 2. By providing the first abutting part 321 around the outer periphery of the corresponding through hole 314, on the one hand, the first abutting part 321 and the first extending part 331 can define the first conduction passage 304 having an arc shape, which increases the space occupied by the first conduction passage 304, improves the space utilization rate of the support body 3, and improves the exhaust capacity; on the other hand, the first abutting part 321 can guide the gas in the through hole 314 to flow into the first exhaust passage 302, which allows as much gas in this part as possible to pass through the support body 3 through the exhaust hole 313, further improving the exhaust capacity.

[0101] Referring again to FIG. 7 and further to FIGS. 10 and 11, FIG. 10 is a structural schematic diagram of the support body 3 of the battery cell 10 provided in some embodiments of the present application from another perspective. FIG. 11 is a partially enlarged view of the support body 3 shown in FIG. 10. A second abutment portion 322 is provided on the second side 312 of the support body body 31, protruding in a direction opposite to the first side 311. The second abutment portion 322 is intended to abut against the wall of the case 11 on which the explosion-proof valve 6 is provided, so as to form a second exhaust passage 303 between the support body 3 and the wall of the case 11. The second exhaust passage 303 communicates with at least one ventilation passage 301.

[0102] The fact that the second abutment portion 322 is provided on the second side 312 of the support body 31 specifically means that the second abutment portion 322 is provided on the side of the support body 31 that is away from the end of the electrode assembly 2, and since the second abutment portion 322 abuts against the wall of the case 11 on which the explosion-proof valve 6 is provided, the second side 312 of the support body 31 is positioned at a distance from the wall of the case 11, and a second exhaust passage 303 is defined between the second side 312 of the support body 31 and the wall of the case 11.

[0103] When the battery cell 10 has a tendency toward thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas passes through the support 3 from the exhaust hole 313, and the other part of the gas passes through the support 3 through the ventilation passage 301, and finally gathers in the second exhaust passage 303 and is discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0104] In the above technical solution, a second abutment portion 322 is provided on the second side 312 of the support body 31, and the second abutment portion 322 is abutted against the wall of the case 11 on which the explosion-proof valve 6 is provided. This defines a second exhaust passage 303 that communicates with the ventilation passage 301 between the second side 312 of the support body 31 and the wall of the case 11, thereby increasing the space occupied by the exhaust path, improving exhaust capacity, reducing the risk of combustion or explosion of the battery cell 10, and reducing the impact on adjacent battery cells 10, which is advantageous for improving the usage reliability and stability of the battery 100.

[0105] 10 and 11, a second extension portion 332 is further protruded from the second side 312 of the support body 31, and the second extension portion 332 and the second abutment portion 322 are spaced apart from each other. The second extension portion 332 and the second abutment portion 322 jointly form a second guide passage 305, which connects at least one ventilation passage 301 and the second exhaust passage 303.

[0106] The second guide passage 305, on the one hand, increases the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, serves as a guide, allowing some of the gas that has passed through the support 3 from the vent passage 301 to flow along the second guide passage 305 to the second exhaust passage 303 and finally be discharged through the explosion-proof valve 6 to relieve pressure, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. In addition, the second guide passage 305 can guide the flow of the electrolyte, further shortening the impregnation time and significantly improving the impregnation efficiency.

[0107] Here, there are multiple ventilation notches 315 on both sides of the exhaust hole 313 in the length direction of the battery cell 10, and multiple ventilation notches 315 located on the same side share one second guide passage 305.

[0108] That is, the plurality of ventilation notches 315 can be divided into two parts, and the ventilation notches 315 of the two parts are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. Accordingly, the number of second conduction passages 305 is two, and the two second conduction passages 305 are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. In the longitudinal direction of the battery cell 10, the second conduction passage 305 located on one side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions. The second conduction passage 305 located on the other side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions.

[0109] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas can pass through the exhaust hole 313 and pass through the support 3 to the second side 312 of the support body 31. Another part of the gas can pass through the multiple ventilation passages 301 and pass through the support 3 to the second side 312 of the support body 31, then flow along the second guide passage 305, and finally collect in the second exhaust passage 303 and be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0110] During the injection, the electrolyte can flow along the second conducting passage 305 into the plurality of ventilation notches 315. After passing through the ventilation notches 315, the electrolyte first flows along the second conducting passage 304 and then flows to the electrode assembly 2, or can flow directly to the electrode assembly 2, thereby shortening the electrolyte impregnation time and improving the impregnation efficiency.

[0111] In the above technical solution, the gas that has passed through the support 3 can flow to the second exhaust passage 303 located in the middle through the guidance of the second guide passage 305, and can finally be discharged through the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. The electrolyte can flow to the multiple ventilation notches 315 through the guidance of the second guide passage 305, shortening the impregnation time and improving the impregnation efficiency.

[0112] Referring again to Figure 11, the second side 312 of the support body 31 has a mounting recess 316 recessed into the first side 311, and a second exhaust passage 303 is defined between the mounting recess 316 and the wall of the case 11 on which the explosion-proof valve 6 is provided, and an exhaust hole 313 is provided in the bottom wall of the mounting recess 316.

[0113] The mounting recess 316 is a groove recessed into the surface of the second side 312 of the support body 31, and the bottom wall of the mounting recess 316 is lower than the surface of the second side 312 of the support body 31, so that the surface on which the exhaust hole 313 is located is lower than the surface of the second side 312 of the support body 31.

[0114] In the above technical solution, by providing the mounting recess 316 on the second side 312 of the support body 31, the distance between the wall of the case 11 on which the explosion-proof valve 6 is provided and the exhaust hole 313 can be increased, which increases the space occupied by the exhaust path, improves the exhaust capacity, further reduces the risk of combustion and explosion of the battery cell 10, reduces the impact on adjacent battery cells 10, and is advantageous to improving the usage reliability and stability of the battery 100.

[0115] Here, a vent hole 317 is provided on the side wall of the mounting recess 316, connecting the second guide passage 305 and the second exhaust passage 303. Gas in the second guide passage 305 can flow through the vent hole 317 to the second exhaust passage 303 and is ultimately discharged through the explosion-proof valve 6 to relieve pressure, reducing the risk of combustion or explosion of the battery cell 10 and reducing the impact on adjacent battery cells 10, which is advantageous for improving the reliability and stability of the battery 100 in use.

[0116] In some embodiments, a weight-reducing groove 319 is further provided on the second side 312 of the support body 31, which not only reduces the weight of the support body 3 but also further increases the space occupied by the exhaust path, improves the exhaust capacity, and increases the space utilization rate.

[0117] 10 and 11, by providing the second contact portion 322 in an arc shape, the second contact portion 322 and the second extension portion 332 define the second guide flow passage 305 in an arc shape.

[0118] The number of second abutment portions 322 is two, and the two second abutment portions 322 are located on either side of the exhaust hole 313. For example, the two first abutment portions 321 are each formed as an arc-shaped plate, and both ends of each arc-shaped plate are spaced apart and are provided facing the exhaust hole 313. As another example, the two first abutment portions 321 each form a closed annular plate.

[0119] Here, the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are spaced apart around the circumferential direction of the corresponding second abutment portion 322, and the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding second guide passage 305. In this way, the multiple ventilation passages 301 are all connected to the same second guide passage 305, and gas flowing out from the multiple ventilation passages 301 is guided by the second guide passage 305 to collect in the second exhaust passage 303, and can finally be discharged from the explosion-proof valve 6.

[0120] Therefore, in the above technical solution, by providing the second contact portion 322 in an arc shape and providing a plurality of ventilation notches 315 located on the same side of the exhaust hole 313 at intervals around the circumferential direction of the corresponding second contact portion 322, it is possible to define the second guide passage 305 in an arc shape, thereby increasing the space occupied by the second guide passage 305, improving the space utilization rate of the support 3, and further improving the exhaust capacity.In addition, the impregnation time can be further shortened, and the impregnation efficiency can be improved.

[0121] Referring again to Figures 3 to 4 and Figures 10 to 11, the wall of the case 11 on which the explosion-proof valve 6 is provided further has a positive electrode column 1201 and a negative electrode column 1202, and the support body 31 has two through holes 314 for exposing the positive electrode column 1201 and the negative electrode column 1202, and the exhaust hole 313 is located between the two through holes 314, and the two second abutment portions 322 and the two through holes 314 are provided in a one-to-one correspondence, and each second abutment portion 322 is provided around the outer periphery of the corresponding through hole 314.

[0122] In the above technical solution, by providing two through holes 314 in the support body 31, the positive electrode pole 1201 and the negative electrode pole 1202 can be avoided, and the positive electrode pole 1201 and the negative electrode pole 1202 can be connected to the corresponding conductive part 22 of the electrode assembly 2. By providing the second abutting part 322 around the outer periphery of the corresponding through hole 314, on the one hand, the second abutting part 322 and the second extending part 332 can define the second conduction passage 305 having an arc shape, which increases the space occupied by the second conduction passage 305, thereby increasing the space utilization rate of the support body 3 and improving the exhaust capacity, and on the other hand, reducing the backflow of gas from the through holes 314.

[0123] 9 again, a positioning groove 318 for fitting with the positive electrode pole 1201 or the negative electrode pole 1202 is provided in the hole wall of the through-hole 314. Providing the positioning groove 318 is advantageous in improving the connection reliability between the positive electrode pole 1201 or the negative electrode pole 1202 and the support 3. The positioning groove 318 can also speed up the flow of the electrolyte, shortening the impregnation time and improving the impregnation efficiency.

[0124] In some embodiments, the inner peripheral edge of the second abutment portion 322 exceeds the hole wall of the through hole 314, the positioning groove 318 includes a horizontal groove portion and a vertical groove portion, the horizontal groove portion is provided on the surface of the second abutment portion 322 facing the support body 31, and the vertical groove portion is provided on the wall surface of the through hole 314 of the support body 31, and both the horizontal groove portion and the vertical groove portion can be fitted with the positive electrode pole 1201 or the negative electrode pole 1202, further improving the mounting reliability of the positive electrode pole 1201 or the negative electrode pole 1202.

[0125] Referring again to FIG. 7, the electrode assembly 2 includes at least two electrode assemblies 2, which are stacked one on top of the other, and at least one ventilation notch 315 is provided facing the middle position of two adjacent electrode assemblies 2.

[0126] Specifically, after shaping the electrode assembly 2, its two opposing side walls form arc-shaped walls, and therefore, when two electrode assemblies 2 are stacked and arranged, a recess is defined between the two arc-shaped walls (at the midpoint between the two electrode assemblies 2), and at least one ventilation notch 315 is provided opposite the recess.

[0127] In the above technical solution, by providing at least one ventilation notch 315 facing 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 support body 31 through the ventilation notch 315 to the second side 312 of the support body 31, and then move to the position of the explosion-proof valve 6, thereby improving the immediacy of pressure release of the explosion-proof valve and improving the reliability and stability of the battery in use.

[0128] Referring again to Figures 3 and 4, the wall of the case 11 on which the explosion-proof valve 6 is provided further has a pole 12, which is at least one of a positive pole 1201 and a negative pole 1202, the support body 31 has a through-hole 314 that exposes the pole 12, the electrode assembly 2 includes an active material application portion 21 and a conductive portion 22 connected to the active material application portion 21, and the support body 3 is supported by the end of the active material application portion 21 on which the conductive portion 22 is provided.

[0129] 12 and 13, Fig. 12 is a partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. Fig. 13 is a partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The pole 12 has a receiving portion 121 communicating with the through-hole 314, and at least a portion of the conductive portion 22 extends through the through-hole 314 and is received in the receiving portion 121, so that the conductive portion 22 is electrically connected to the pole 12. In other words, the pole 12 has a hollow structure.

[0130] Here, "at least a portion" means that the entire conductive portion 22 may be accommodated within the accommodation portion 121, or that only a portion of the conductive portion 22 may be accommodated within the accommodation portion 121. Because the accommodation portion 121 is provided in the pole 12, the hollow structure of the accommodation portion 121 can, on the one hand, reduce the weight of the pole 12 to a certain extent and improve the weight-energy density of the battery cell 10 and the battery 100; and, on the other hand, the conductive portion 22 can be accommodated within the accommodation portion 121, which improves the mounting efficiency of the conductive portion 22 and also saves the space occupied by the conductive portion 22, fully utilizes the space of the battery cell 10, and makes the fit between the support 3 and the pole 12 and between the support 3 and the conductive portion 22 tighter and more reliable, making the structure of the battery cell 10 more compact and more advantageous for improving the energy density of the battery cell 10.

[0131] More specifically, by accommodating a part or all of the conductive portion 22 within the accommodation portion 121, the portion of the conductive portion 22 located within the accommodation portion 121 can occupy space within the electrode post 12, thereby reducing the space occupied by the conductive portion 22 within the case 11. For a given size of the case 11, a certain amount of space can be saved within the case 11 to accommodate a larger-sized active material-coated portion 21, thereby improving the volumetric energy density of the battery cell 10. For example, by extending the conductive portion 22 from the side of the active material-coated portion 21 closer to the electrode post 12, the space occupied by the conductive portion 22 between the active material-coated portion 21 and the electrode post 12 can be saved. This allows the size of the active material-coated portion 21 in the direction in which the conductive portion 22 is extended to be increased, thereby reducing the distance between the active material-coated portion 21 and the electrode post 12, thereby improving the energy density of the battery cell 10.

[0132] At the same time, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121, the space occupied by the battery cell 10 itself can be reduced, allowing more battery cells 10 to be accommodated in the same volume of the battery 100, and increasing the volumetric energy density of the battery 100. Furthermore, by accommodating at least a portion of the conductive portion 22 within the accommodating portion 121 and occupying the space within the electrode post 12, the redundancy of the conductive portion 22 within the case 11 can be reduced at least to some extent, reducing the probability of a short circuit between the conductive portion 22 and the active material-coated portion 21 and thus reducing the probability of a short circuit within the battery cell 10, thereby improving the operational reliability and stability of the battery cell 10 and the battery 100.

[0133] It should be noted that in the embodiments of the present application, the location of the accommodating section 121 may be on the side of the pole 12 facing the active material application section 21, or on the side opposite to the active material application section 21 of the pole 12.

[0134] For example, referring again to Figures 12 and 13, when the accommodating portion 121 is located on the side facing the active material application portion 21 of the pole 12, the accommodating portion 121 includes a first accommodating groove 12110, the surface of the pole 12 facing the active material application portion 21 is the pole inner end surface 122, the groove opening of the first accommodating groove 12110 is formed in the pole inner end surface 122, and at least a portion of the conductive portion 22 is accommodated in the first accommodating groove 12110.

[0135] For example, the first accommodating groove 12110 is a groove body, and the groove body has a groove-like structure with a certain depth. For example, if the electrode post 12 is provided on the upper end wall of the case 11 and the electrode post inner end surface 122 is the lower surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening downward and groove walls recessed upward. Also, for example, if the electrode post 12 is provided on the lower end wall of the case 11 and the electrode post inner end surface 122 is the upper surface of the electrode post 12, the first accommodating groove 12110 is formed as an accommodating groove with a groove opening upward and groove walls recessed downward.

[0136] In the above technical solution, on the one hand, by opening the first accommodating groove 12110 in the electrode post 12, the weight of the electrode post 12 can be reduced to a certain extent, thereby improving the weight-energy density of the battery cell 10 and the battery 100. On the other hand, the groove opening of the first accommodating groove 12110 is formed in the electrode post inner end surface 122, which is the surface of the electrode post 12 closer to the active material coated portion 21, so that the first accommodating groove 12110 can open toward the active material coated portion 21, which makes it easier for the conductive portion 22 to extend into the first accommodating groove 12110, improving mounting efficiency. In addition, a first accommodating groove 12110 of this type is easy to process, improving production efficiency.

[0137] Furthermore, the first accommodating groove 12110 can be easily machined to have a larger volume, allowing it to accommodate a larger number of conductive portions 22. At the same time, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffer and temporary storage structure for the electrolyte, allowing a larger amount of electrolyte to be accommodated within the case 11. Because the electrolyte is consumed during the charging and discharging process of the battery cell 10, a larger amount of electrolyte can extend the service life of the battery cell 10. Furthermore, because the first accommodating groove 12110 opens toward the active material application portion 21, the first accommodating groove 12110 can also be used as a buffer structure for accommodating and buffering gas generated within the electrode assembly 2, reducing expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0138] Furthermore, since the first accommodating groove 12110 is located inside the pole 12, external foreign matter and impurities are less likely to enter the first accommodating groove 12110, which reduces the impact of external foreign matter and impurities on the electrode assembly 2, improving the operational stability and reliability of the electrode assembly 2 and further improving the stability and reliability of the battery cell 10 and the battery 100.

[0139] 12 again, in the embodiments of the present application, the method of connecting the terminal post 12 and the case 11 is not limited, and may be, for example, welding or riveting. For example, when the two are fitted together by riveting, the case 11 has a mounting hole 113, and the terminal post 12 is attached by riveting into the mounting hole 113. Of course, even when the two are fitted together by welding or another method, the mounting hole 113 may be provided in the case 11 so that the terminal post 12 can be easily attached to the case 11 through the mounting hole 113, and it can be understood that this is not limited here.

[0140] At the same time, the first accommodating groove 12110 may be provided corresponding to the position of the mounting hole 113. In other words, on a projection plane perpendicular to the axial direction R of the terminal post 12, the orthogonal projection of the first accommodating groove 12110 is within the orthogonal projection range of the mounting hole 113, so that the first accommodating groove 12110 has a greater depth and can accommodate more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 within the case 11. Specifically, when the mounting hole 113 is formed in the case 11 and the terminal post 12 is attached to the mounting hole 113, the depth H1 of the first accommodating groove 12110 in the axial direction R of the terminal post 12 is equal to or greater than the minimum distance H2 from the terminal post inner end surface 122 to the mounting hole 113.

[0141] It should be noted that the specific shape of the first receiving groove 12110 is not limited and may be a regular shape or an irregular shape. For example, it may be a columnar groove with a rectangular, elliptical, or runway-shaped cross section, a trapezoidal groove with a rectangular cross section and a gradually changing cross-sectional size, a hemispherical groove with a circular cross section and a gradually changing cross-sectional size, or a hemi-elliptical groove with an elliptical cross section and a gradually changing cross-sectional size. Therefore, the depth H1 of the first receiving groove 12110 refers to the maximum depth of the first receiving groove 12110 in the axial direction R of the pole pillar 12.

[0142] In the axial direction R of the electrode post 12, the depth H1 of the first accommodating groove 12110 is equal to or greater than the minimum distance H2 from the electrode post inner end surface 122 to the mounting hole 113, thereby making full use of the volume of the electrode post 12. The first accommodating groove 12110 has a greater depth, which is advantageous for accommodating more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 within the case 11, further increasing the energy density of the battery cell 10, and reducing redundancy of the conductive parts 22 within the case 11. At the same time, the greater depth of the first accommodating groove 12110 allows it to accommodate gas generated from the electrode assembly 2, thereby improving the reliability and stability of the battery cell 10, and also allows it to accommodate more electrolyte, thereby extending the service life of the battery cell 10.

[0143] Referring again to Figures 12 and 13, in order to improve the stability and reliability of the electrical connection between the active material application portion 21 and the electrode post 12, in some embodiments of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 may be on the groove wall of the first accommodating groove 12110 formed in the accommodating portion 121.

[0144] For example, the conductive part 22 and the terminal post 12 may be electrically connected by welding, and the electrical connection position is the weld position between the conductive part 22 and the terminal post 12. At the same time, the welding method between the conductive part 22 and the terminal post 12 is not limited, and may be, for example, laser welding. Furthermore, vertical welding, inclined welding, lap welding, edge seal welding, etc. may be selected depending on factors such as the position, angle, or structure of the welded portion. In other embodiments of the present application, the conductive part 22 and the terminal post 12 may be electrically connected by other methods, such as providing a conductive adhesive or a conductive nail, instead of welding. For simplicity of explanation, the following description will be given taking the example of the conductive part 22 and the terminal post 12 being electrically connected by welding, and the weld position being the electrical connection position between the conductive part 22 and the terminal post 12.

[0145] Specifically, the electrode post 12 includes a first end wall 12111 and a first side wall 12113. The first end wall 12111 is located on the side of the first side wall 12113 that is away from the active material applied portion 21, and the first end wall 12111 and the first side wall 12113 form a first accommodating groove 12110, and the electrically connecting position between the conductive portion 22 and the electrode post 12 is located on the first end wall 12111 and / or the first side wall 12113. In other words, the conductive portion 22 may be welded to at least one of the first end wall 12111 and the first side wall 12113.

[0146] In the above technical solution, the electrical connection position between the conductive portion 22 and the electrode post 12 is set on at least one of the first end wall 12111 and the first side wall 12113. This allows the first accommodating groove 12110 to accommodate at least a portion of the conductive portion 22, and the groove wall of the first accommodating groove 12110 to establish electrical connection with the conductive portion 22. This simplifies the structure of the electrode post 12, facilitates processing of the electrode post 12, simplifies the structure of the conductive portion 22, reduces redundancy of the conductive portion 22, and reduces the cost of the conductive portion 22. Furthermore, by using the groove wall of the first accommodating groove 12110 to establish electrical connection with the conductive portion 22, the area for electrical connection between the conductive portion 22 and the electrode post 12 can be set relatively large. This 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.

[0147] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the first accommodating groove 12110, not only is it possible to prevent the electrical connection position from protruding from the outside of the pole 12 and occupying space other than the pole 12, but the electrical connection position can also be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0148] In addition, in the embodiments of the present application, the first end wall 12111 is configured as a sealed structure without a via hole 12130, thereby isolating the first accommodating groove 12110 from the external space of the case 11 and avoiding the problem of the electrolyte in the case 11 leaking from the first accommodating groove 12110.

[0149] 12 and 13, in some alternative embodiments, the local shape of the conductive portion 22 matches the local shape of the first end wall 12111 so that the position where the conductive portion 22 is electrically connected to the first end wall 12111 extends in the length or width direction of the first end wall 12111, and the conductive portion 22 is bonded to the first end wall 12111 to achieve the electrical connection. For example, if the first end wall 12111 is flat, a portion of the conductive portion 22 may also be flat and bonded to the first end wall 12111, and the bonding position may be electrically connected by, for example, welding. This increases the area of ​​electrical connection and improves the reliability and stability of the electrical connection.

[0150] Furthermore, when the electrical connection between the conductive portion 22 and the first end wall 12111 is made by welding, the first end wall 12111 is located on the side of the first accommodating groove 12110 away from the active material application portion 21, making the welding operation easy; for example, welding can be performed from the side of the pole 12 away from the active material application portion 21.

[0151] It should be noted that the shape of the first end wall 12111 is not limited, and may be, for example, a flat plate, an arc plate, etc. Here, when the first end wall 12111 has a flat structure, the first end wall 12111 is disposed at an angle with respect to the axial direction R of the pole 12, and may be, for example, a flat plate structure perpendicular to the axial direction R of the pole 12, or may be, for example, an inclined plate structure not perpendicular to the axial direction R of the pole 12, but the inclination direction is not limited.

[0152] Of course, in other embodiments of the present application, the position at which the conductive portion 22 is electrically connected to the first end wall 12111 may not extend in the length or width direction of the first end wall 12111, but may be, for example, a plurality of discrete points, for example, the conductive portion 22 having a plurality of spaced apart portions each welded to the first end wall 12111, which will not be described in detail here.

[0153] 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 countersunk groove 12112 may be provided in the first end wall 12111, and the recessed direction of the first countersunk groove 12112 is opposite to that of the active material applied portion 21. At least a portion of the electrical connection position between the conductive portion 22 and the first end wall 12111 is located within the first countersunk groove 12112. For example, at least a portion of the conductive portion 22 may be provided within the first countersunk groove 12112 and connected to a portion of the first end wall 12111 that defines the first countersunk groove 12112.

[0154] In the above technical solution, on the one hand, the first countersunk groove 12112 can be used to achieve pre-positioning and position control of the electrical connection position of the conductive part 22, which is advantageous for identifying the exact position to achieve electrical connection and improving production efficiency, as well as for improving the stability and reliability of the conductive part 22, thereby improving the stability and reliability during charging and discharging of the battery cell 10. On the other hand, by providing the first countersunk groove 12112 in the first end wall 12111, the wall thickness of the first end wall 12111 can be locally thinned, which is advantageous for welding and for reducing the weight of the electrode post 12, thereby improving the weight-energy density of the battery cell 10.

[0155] Referring again to Figures 13 and 14, in the embodiments of the present application, if necessary, a first groove 126 may be provided in the pole 12, and the first groove 126 is located on the side of the pole 12 away from the active material application portion 21. That is, the surface of the pole 12 away from the active material application portion 21 is the pole outer end surface 123, and the groove opening of the first groove 126 is formed on the pole outer end surface 123.

[0156] It can be understood that the first groove 126 is a groove body, and the groove body is a groove-like structure having a certain depth. Furthermore, when the electrode post 12 is attached to the upper end wall of the case 11 and the electrode post outer end surface 123 is the upper surface of the electrode post 12, the first groove 126 is formed as a first groove 126 with its groove opening upward and its groove walls recessed downward (i.e., recessed in a square shape close to the electrode assembly 2). Furthermore, when the electrode post 12 is attached to the lower end wall of the case 11 and the electrode post outer end surface 123 is the lower surface of the electrode post 12, the first groove 126 is formed as a first groove 126 with its groove opening downward and its groove walls recessed upward (i.e., recessed in a square shape away from the electrode assembly 2).

[0157] In the above technical solution, on the one hand, the first groove 126 is provided on the electrode post 12, which can further reduce the weight of the electrode post 12 and improve the weight-energy density of the battery cells 10 and the battery 100. On the other hand, the first groove 126 is located on the outside of the electrode post 12, i.e., it opens on the side of the electrode post 12 opposite to the inside of the case 11, and the structural components in the battery 100 that electrically connect each battery cell 10 can be accommodated or mounted in the first groove 126, which can fully utilize the space within the electrode post 12 and improve the space utilization rate and volumetric energy density of the battery 100.

[0158] Furthermore, the electrode post 12 has both the first accommodating groove 12110 and the first groove 126, and the first groove 126 is located on the side of the first accommodating groove 12110 that faces away from the active material coated portion 21 and opens in the opposite direction from the first accommodating groove 12110. This makes it convenient to laser-weld the conductive portion 22 and the first end wall 12111 through the first groove 126 from the outside of the electrode post 12, i.e., from the side of the electrode post 12 that faces away from the active material coated portion 21, facilitating electrical connection between the conductive portion 22 and the electrode post 12 through external welding. In other words, the above structure facilitates external welding of the electrode post 12 and the conductive portion 22 through the first groove 126, facilitating processing and manufacturing of the battery cell 10 and reducing processing and manufacturing costs.

[0159] Furthermore, in order to simply and effectively weld the conductive portion 22 to the groove wall of the first accommodating groove 12110 through the first groove 126 and improve the welding reliability between the conductive portion 22 and the groove wall of the first accommodating groove 12110, in the embodiments of the present application, the portion between the first groove 126 and the first accommodating groove 12110 may be laser welded to the conductive portion 22, that is, the gap portion 127 shown in Figure 14 is laser welded to the conductive portion 22 to realize an electrical connection between the electrode assembly 2 and the pole 12. The thickness of the spacing portion 127 of the pole post 12 located between the first groove 126 and the first accommodating groove 12110 is relatively thin, and the spacing portion 127 separates the first groove 126 from the first accommodating groove 12110. The wall surface of the spacing portion 127 closer to the active material application portion 21 can be the first end wall 12111. When the conductive portion 22 needs to be welded to the first end wall 12111, the relatively thin thickness of the spacing portion 127 makes it advantageous to weld the conductive portion 22 to the first end wall 12111 through the first groove 126, thereby improving the convenience and reliability of the welding.

[0160] Referring again to FIG. 13 , the battery cell 10 may further include a slot cover 7 disposed on the pole 12 and covering the opening of the first groove 126. In the above technical solution, the slot cover 7 covering the first groove 126 allows the pole 12 to achieve indirect electrical connection with the current collecting member via 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 current collecting member can be facilitated and the electrical connection area can be increased. Thus, the slot cover 7 facilitates electrical connection between adjacent battery cells 10 in the battery 100. Furthermore, the electrical connection positions between the battery cells 10 are located on the slot covers 7, and the electrical connection positions between the conductive parts 22 and the pole 12 are separated by the first groove 126, reducing interference between them and further improving the stability and reliability of the battery cell 10.

[0161] 15 is a partial cross-sectional view of a battery cell 10 provided in some embodiments of the present application. The accommodating portion 121 may be configured to include a second accommodating groove 12120, the surface of the pole 12 facing away from the active material coated portion 21 being the pole outer end surface 123, the opening of the second accommodating groove 12120 being formed in the pole outer end surface 123, the second accommodating groove 12120 communicating with the interior of the case 11 through a via hole 12130, and the conductive portion 22 being inserted through the via hole 12130 and at least partially accommodated in the second accommodating groove 12120.

[0162] It can be understood that the second accommodating groove 12120 is a groove body, and the groove body is a groove-like structure with a certain depth. For example, if the electrode post 12 is provided on the upper end wall of the case 11 and the electrode post outer end surface 123 is the upper surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with its groove mouth opening upward and its groove walls recessed downward. Also, for example, if the electrode post 12 is provided on the lower end wall of the case 11 and the electrode post outer end surface 123 is the lower surface of the electrode post 12, the second accommodating groove 12120 is formed as an accommodating groove with its groove mouth opening downward and its groove walls recessed upward.

[0163] 15 again, in the above technical solution, by providing the second accommodating groove 12120 in the electrode post 12, on the one hand, the weight of the electrode post 12 can be reduced to a certain extent, and the weight-energy density of the battery cell 10 and the battery 100 can be improved. On the other hand, the groove opening of the second accommodating groove 12120 is formed in the electrode post outer end surface 123, which is the surface of the electrode post 12 facing away from the active material coated portion 21. Therefore, when at least a portion of the conductive portion 22 is accommodated in the second accommodating groove 12120, the conductive portion 22 can be easily accommodated and organized through the groove opening of the second accommodating groove 12120. Furthermore, the electrical connection between the conductive portion 22 and the electrode post 12 can also be easily achieved through the groove opening of the second accommodating groove 12120. This reduces the difficulty of manufacturing the battery cell 10 and improves the production efficiency of the battery cell 10.

[0164] At the same time, because the second accommodating groove 12120 can communicate with the interior of the case 11 through the via hole 12130, the second accommodating groove 12120 can also be used as a buffer and temporary storage structure for the electrolyte, allowing more electrolyte to be accommodated within the case 11. Because electrolyte is consumed during the charging and discharging process of the battery cell 10, more electrolyte can extend the service life of the battery cell 10. In addition, because the second accommodating groove 12120 can communicate with the interior of the case 11 through the via hole 12130, the second accommodating groove 12120 can also be used as a buffer structure for accommodating and buffering gas generated within the electrode assembly 2, reducing expansion of the battery cell 10 and improving the reliability and stability of the battery cell 10.

[0165] It should be noted that when the accommodating portion 121 has the second accommodating groove 12120 and the conductive portion 22 is inserted into the via hole 12130 and at least partially accommodated in the second accommodating groove 12120, the electrical connection position between the conductive portion 22 and the electrode post 12 is not limited. For example, when the conductive portion 22 is inserted into the via hole 12130 and at least partially accommodated in the second accommodating groove 12120, in the embodiment of the present application, the electrical connection position between the conductive portion 22 and the electrode post 12 is located at the hole wall of the via hole 12130 formed in the electrode post 12.

[0166] In the above technical solution, the electrical connection position between the conductive part 22 and the electrode post 12 is set on the hole wall of the via hole 12130, which makes it easier to electrically connect the conductive part 22 and the electrode post 12 through the second accommodating groove 12120. Furthermore, when the electrical connection area between the conductive part 22 and the electrode post 12 is large, the sealing of the via hole 12130 can be achieved by the electrical connection between the conductive part 22 and the electrode post 12, thereby saving on sealing costs, reducing electrolyte leakage, and saving on sealing components.

[0167] Specifically, the conductive part 22 can be welded to the wall of the via hole 12130 at the position where the via hole 12130 is connected to the second accommodating groove 12120, making the operation easy. In addition, by controlling the welding marks and sealing the via hole 12130 using the welding marks and the conductive part 22, the problem of the electrolyte inside the case 11 leaking from the via hole 12130 can be alleviated.

[0168] As another example, when the conductive portion 22 is inserted through the via hole 12130 and at least partially accommodated in the second accommodating groove 12120, in some other embodiments of the present application, the electrical connection position between the conductive portion 22 and the terminal post 12 may be located on the groove wall of the second accommodating groove 12120 formed in the terminal post 12. This facilitates the electrical connection operation, and, for example, when the conductive portion 22 is welded to the groove wall of the second accommodating groove 12120 formed in the terminal post 12, it is possible to alleviate problems such as conductive particles generated by welding entering the case 11 and causing a short circuit.

[0169] Referring again to Figure 15, 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 closer to the active material application portion 21, the second end wall 12121 and the second side wall 12123 surround each other to form a second accommodating groove 12120, the via hole 12130 is opened in the second end wall 12121, and the electrical connection position between the conductive portion 22 and the pole 12 is located on the second end wall 12121 and / or the second side wall 12123.

[0170] More specifically, the conductive portion 22 and the electrode post 12 may be electrically connected by welding, and therefore the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. In other embodiments of the present application, the conductive portion 22 and the electrode post 12 may be electrically connected by other methods, such as by providing a conductive adhesive or a conductive nail, instead of welding, which will not be described in detail here.

[0171] For the sake of simplicity, the following description will be given taking as an example the case where the conductive portion 22 and the electrode post 12 are electrically connected by welding, and the welding position is the electrical connection position between the conductive portion 22 and the electrode post 12. For example, in some embodiments, the electrical connection position between the conductive portion 22 and the electrode post 12 is located on 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.

[0172] In the above technical solution, the electrical connection position between the conductive portion 22 and the electrode post 12 is set on at least one of the second end wall 12121 and the second side wall 12123, so that the second accommodating groove 12120 not only accommodates at least a portion of the conductive portion 22, but also has a groove wall of the second accommodating groove 12120 realize electrical connection with the conductive portion 22, thereby simplifying the structure of the electrode post 12 and facilitating processing of the electrode post 12. In addition, because the via hole 12130 is opened in the second end wall 12121, the conductive portion 22 can easily extend into the second accommodating groove 12120 through the via hole 12130, thereby simplifying the structure of the conductive portion 22, reducing redundancy of the conductive portion 22, and reducing the cost of the conductive portion 22. Furthermore, due to the opening direction of the groove opening of the second accommodating groove 12120, the operation of electrically connecting the conductive portion 22 to the groove wall of the second accommodating groove 12120 can be easily performed through the groove opening of the second accommodating groove 12120, thereby reducing the difficulty of the electrical connection. Furthermore, by achieving electrical connection with the conductive portion 22 through the groove wall of the second accommodating groove 12120, the area for electrical connection between the conductive portion 22 and the electrode post 12 can be relatively large, improving the reliability and stability of the electrical connection and further improving the performance of the battery cell 10.

[0173] Furthermore, since the electrical connection position between the conductive portion 22 and the pole 12 is located within the second accommodating groove 12120, not only is it possible to prevent the electrical connection position from protruding from the outside of the pole 12 and occupying space other than the pole 12, but the electrical connection position can also be protected by the pole 12, thereby improving the reliability and stability of the electrical connection between the conductive portion 22 and the pole 12.

[0174] 15, in some embodiments, the local shape of the conductive portion 22 matches the local shape of the second end wall 12121 so that the position where the conductive portion 22 is electrically connected to the second end wall 12121 extends in the length or width direction of the second end wall 12121, and the conductive portion 22 is bonded to the second end wall 12121 to achieve the electrical connection. For example, if the second end wall 12121 is flat, a portion of the conductive portion 22 may also be flat and bonded to the second end wall 12121, and the bonding position may be electrically connected by, for example, welding. This increases the area of ​​electrical connection and improves the reliability and stability of the electrical connection.

[0175] It should be noted that the shape of the second end wall 12121 is not limited, and may be, for example, a flat plate-like structure, an arc-shaped plate-like structure, etc. Here, when the second end wall 12121 has a flat plate-like structure, the second end wall 12121 is disposed at an angle with respect to the axial direction R of the electrode post 12, and may be, for example, a flat plate-like structure perpendicular to the axial direction R of the electrode post 12, or may be, for example, an inclined flat plate structure not perpendicular to the axial direction R of the electrode post 12, but the inclination direction is not limited.

[0176] 15, when the second end wall 12121 has a flat plate-like structure, the included angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is equal to 90°, that is, the second end wall 12121 and the active material coating portion 21 are equidistant from each other in the direction from the via hole 12130 toward the second side wall 12123. This facilitates welding of the conductive portion 22 and the second end wall 12121.

[0177] Furthermore, for example, the included angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 is greater than 90°. That is, in the direction from the via hole 12130 toward the second side wall 12123, the second end wall 12121 extends at an angle approaching the active material coated portion 21. This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. For example, the included angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 may be 90° to 145°, such as 100°, 110°, 120°, 130°, or 140°. This, on the one hand, makes it easier to process the second end wall 12121 and facilitates electrical connection with the conductive portion 22, and, on the other hand, makes it possible to fully utilize the space within the electrode post 12 to accommodate the conductive portion 22.

[0178] As another example, the included angle θ between the second end wall 12121 and the axial direction R of the pole post 12 is smaller than 90°, i.e., in the direction from the via hole 12130 toward the second side wall 12123, the second end wall 12121 extends at an angle away from the active material application portion 21.

[0179] This increases the extension distance of the conductive portion 22 along the second end wall 12121, thereby improving the reliability of the electrical connection. For example, the included angle θ between the second end wall 12121 and the axial direction R of the electrode post 12 may be 45° to 90°, such as 50°, 60°, 70°, 80°, etc. This, on the one hand, makes it easier to process the second end wall 12121 and to make an electrical connection with the conductive portion 22, and, on the other hand, makes it possible to fully utilize the space within the electrode post 12 to accommodate the conductive portion 22.

[0180] Of course, the present application is not limited thereto. In other embodiments of the present application, the position at which the conductive portion 22 is electrically connected to the second end wall 12121 does not have to extend in the length or width direction of the second end wall 12121, but may be a plurality of discrete points. For example, the conductive portion 22 has a plurality of spaced apart portions that are respectively welded to the second end wall 12121, and this will not be described in detail here.

[0181] Referring again to FIG. 15 and further to FIG. 16, FIG. 16 is a partial cross-sectional schematic diagram of a battery cell 10 provided in some embodiments of the present application. Regardless of the specific value of the included angle θ between the second end wall 12121 and the axial direction R of the electrode post 12, in the embodiments of the present application, when the conductive portion 22 is electrically connected to the second end wall 12121, a second countersunk groove 12122 can be provided in the second end wall 12121 as needed. The second countersunk groove 12122 is a recessed groove formed by sinking a portion of the second end wall 12121 toward the end closest to the active material application portion 21. The position where the conductive portion 22 is electrically connected to the second end wall 12121 is at least partially located within the second countersunk groove 12122.

[0182] In the above technical solution, the portion of the conductive part 22 located within the second countersunk groove 12122 is set to match the shape of the second countersunk groove 12122 and is attached to achieve electrical connection, so that the second countersunk groove 12122 can be used to pre-position and regulate the electrical connection position of the conductive part 22, which is advantageous for identifying the exact position to achieve electrical connection, improving production efficiency, and improving the stability and reliability of the electrical connection position, thereby improving the reliability and stability of the charging and discharging operation of the battery cell 10.

[0183] 16 again, in the embodiments of the present application, the method of connecting the terminal post 12 and the case 11 is not limited, and may be, for example, welding or riveting. For example, when the two are fitted together by riveting, the case 11 has a mounting hole 113, and the terminal post 12 is attached by riveting into the mounting hole 113. Of course, it can be understood that the mounting hole 113 may be provided in the case 11, and the terminal post 12 is attached to the mounting hole 113, even when the two are fitted together by welding or another method.

[0184] Optionally, referring again to FIG. 15, the second accommodating groove 12120 may be provided 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 orthogonal projection of the second accommodating groove 12120 is within the orthogonal projection range of the mounting hole 113, so that the second accommodating groove 12120 has a greater depth and can accommodate more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 within the case 11.

[0185] In some embodiments, referring again to FIG. 15 , when the case 11 has a mounting hole 113 and the pole 12 is mounted in the mounting hole 113, the depth H3 of the second accommodating groove 12120 in the axial direction R of the pole 12 is greater than or equal to the minimum distance H4 from the pole outer end surface 123 to the mounting hole 113.

[0186] It should be noted that the specific shape of the second receiving groove 12120 is not limited and may be a regular shape or an irregular shape. For example, it may be a columnar groove with a rectangular, elliptical, or runway-shaped cross section, a trapezoidal groove with a rectangular cross section and gradually changing cross-sectional size, a hemispherical groove with a circular cross section and gradually changing cross-sectional size, or a hemi-elliptical groove with an elliptical cross section and gradually changing cross-sectional size. It should be noted that the runway-shaped shape described in this specification refers to a shape in which the two short sides of a rectangle are replaced with outward convex curves.

[0187] Therefore, the depth H3 of the second accommodating groove 12120 refers to the maximum depth of the second accommodating groove 12120 in the axial direction R of the electrode post 12. In the axial direction R of the electrode post 12, the depth H3 of the second accommodating groove 12120 is equal to or greater than the minimum distance H4 from the electrode post outer end surface 123 to the mounting hole 113. This allows the volume of the electrode post 12 to be fully utilized, and the second accommodating groove 12120 has a greater depth, which is advantageous for accommodating more conductive parts 22, thereby significantly reducing the space occupied by the conductive parts 22 in the case 11, further increasing the energy density of the battery cell 10, and further reducing redundancy of the conductive parts 22 in the case 11. At the same time, the greater depth of the second accommodating groove 12120 allows it to accommodate gas generated from the electrode assembly 2, thereby improving the reliability and stability of the battery cell 10, and also allows it to accommodate more electrolyte, thereby extending the service life of the battery cell 10.

[0188] 16 and further refer to FIG. 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 has the second accommodating groove 12120 of any of the above embodiments, the battery cell 10 may optionally further include a cover plate 13 that fits with the pole 12 and seals the opening of the second accommodating groove 12120, and the cover plate 13 is electrically connected to the pole 12.

[0189] In the above technical solution, by providing a cover plate 13 that seals the groove opening of the second accommodating groove 12120, it is possible to prevent the electrolyte in the case 11 from leaking from the groove opening of the second accommodating groove 12120. Furthermore, since the cover plate 13 seals the groove opening of the second accommodating groove 12120 and is electrically connected to the electrode post 12, an indirect electrical connection between the electrode post 12 and the current collecting member can be easily realized by the cover plate 13, which is advantageous in increasing the connection area of ​​the electrical connection position and thereby also advantageous in reducing the resistance of the electrical connection position.

[0190] It should be noted that the manner and position of fitting the cover plate 13 and the terminal post 12 are not limited as long as the cover plate 13 can seal the opening of the second accommodating groove 12120. For example, in some embodiments, the cover plate 13 may be welded to the terminal post 12, and during processing, the conductive part 22 may first be passed through the via hole 12130 and welded to the wall of the second accommodating groove 12120, and then the cover plate 13 and the terminal post 12 may be welded to seal the opening of the second accommodating groove 12120.

[0191] It should also be noted that there is no limitation on the specific configuration of the cover plate 13. For example, in some alternative embodiments, referring to Fig. 17, 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 being fitted with and electrically connected to the pole 12, and the second conductive member 132 being fitted with and electrically connected to the first conductive member 131.

[0192] In the above technical solution, by configuring the cover plate 13 as a composite and configuring the first conductive member 131 to be made of the same material as the electrode post 12, it is possible to easily electrically connect the first conductive member 131 to the electrode post 12. For example, the first conductive member 131 can be easily, reliably, and stably connected to the electrode post 12 by welding. Furthermore, since the second conductive member 132 and the first conductive member 131 are made of different materials, it is easy to electrically connect the second conductive member 132 to a current collecting member made of a different material from the electrode post 12, and the second conductive member 132 can be easily, reliably, and stably connected to a current collecting member made of the same material as the second conductive member 132 by welding, for example.

[0193] For example, when the electrode post 12 is a negative electrode post 12, if the electrode post 12 is a copper post and the current collecting member is an aluminum sheet, the first conductive member 131 can be made of copper and the second conductive member 132 can be made of aluminum, and the electrode post 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 collecting member are made of the same material and can be effectively welded, thereby effectively realizing an indirect electrical connection between the electrode post 12 and the current collecting member via the cover plate 13. In addition, the electrode post 12 and the first conductive member 131 are welded together from copper, which has high fluidity and is less likely to crack, which is advantageous for improving the sealing effect of the welded area.

[0194] 17 again, in some optional examples, the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132. In the above technical solution, since the first conductive member 131 is located between the second accommodating groove 12120 and the second conductive member 132, the second accommodating groove 12120 and the second conductive member 132 can be separated from each other. As a result, when the electrolyte in the case 11 enters the second accommodating groove 12120 through the via hole 12130, the first conductive member 131 can prevent this portion of the electrolyte from contacting the second conductive member 132, thereby solving the problem of corrosion of the second conductive member 132 by the electrolyte.

[0195] It should be noted that the manner in which the first conductive member 131 and the second conductive member 132 are fitted together is not limited. For example, in some embodiments, referring to FIG. 17 , the first conductive member 131 has a second groove 1311, the second conductive member 132 is fitted into the second groove 1311, and the opening of the second groove 1311 is formed on the surface of the first conductive member 131 facing away from the second receiving groove 12120, so that the second conductive member 132 is exposed from the opening of the second groove 1311. Alternatively, in other embodiments, the connection between the first conductive member 131 and the second conductive member 132 may be a fastening connection, a locking connection, or the like.

[0196] It should also be noted that the term "exposed" in exposing the second conductive member 132 from the opening of the second groove 1311 means that the first conductive member 131 does not block the second conductive member 132 at the opening of the second groove 1311, and that the second conductive member 132 does not need to protrude from the opening of the second groove 1311. For example, the second conductive member 132 may be flush with the surface of the first conductive member 131 on the side facing away from the second accommodating groove 12120, or the second conductive member 132 may protrude from the surface of the first conductive member 131 on the side facing away from the second accommodating groove 12120.

[0197] In the above technical solution, on the one hand, by fitting the second conductive member 132 into the first conductive member 131, the difficulty of attaching the first conductive member 131 and the second conductive member 132 is reduced, and the stability and convenience of the fitting between the first conductive member 131 and the second conductive member 132 are improved. In addition, the thickness of the cover plate 13 is reduced, thereby reducing the space occupied by the cover plate 13 and improving the space utilization rate of the battery cell 10. On the other hand, the second conductive member 132 can be exposed from the surface of the first conductive member 131 facing away from the second receiving groove 12120 through the opening of the second groove 1311, which is advantageous for achieving electrical connection between the second conductive member 132 and a current collecting member outside the pole 12.

[0198] Furthermore, since the groove opening of the second groove 1311 is formed on the surface of the first conductive member 131 facing away from the second accommodating groove 12120, the second groove 1311 opens in the direction opposite to the active material application portion 21. As a result, the portion of the first conductive member 131 that defines the groove wall of the second groove 1311 is positioned between the second accommodating groove 12120 and the second conductive member 132, separating the second accommodating groove 12120 and the second conductive member 132. This prevents the electrolyte that has entered the second groove 1311 from coming into contact with the second conductive member 132, thereby reducing leakage of the electrolyte.

[0199] Of course, in other embodiments, the cover plate 13 may not be a composite made of multiple materials. For example, in other embodiments of the present application, the entire cover plate 13 may be a non-composite made of the same material to fit, for example, the positive electrode pole 12, but this will not be described in detail here.

[0200] 17 again, the cover plate 13 is further fitted into the groove opening of the second accommodating groove 12120. In the above technical solution, fitting the cover plate 13 into the second accommodating groove 12120 reduces the difficulty of attaching the cover plate 13 to the electrode post 12, improves the attachment stability between the cover plate 13 and the electrode post 12, and improves the reliability and convenience of the connection, while reducing the occupation of the cover plate 13 in space other than that of the electrode post 12. Furthermore, because the cover plate 13 is fitted into the groove opening of the second accommodating groove 12120, there is sufficient space within the second accommodating groove 12120 to accommodate the conductive part 22.

[0201] Of course, in other embodiments of the present application, the fitting method of the cover plate 13 and the pole 12 is not limited to being fitted into the second accommodating groove 12120. If it is easy to fit the current collecting member of the battery 100, the cover plate 13 may be directly placed over the outside of the pole 12, that is, directly covering the groove opening of the second accommodating groove 12120, and is not limited to this embodiment.

[0202] In an alternative solution, the electrode posts 12 include two, respectively a positive electrode post 1201 and a negative electrode post 1202, and the electrode posts 12 include two through-holes 314, respectively exposing the positive electrode post 1201 and the negative electrode post 1202. During the process of installing the electrode assembly 2 in the case 11, the two conductive parts 22 of the electrode assembly 2 can pass through the two through-holes 314 on the support 3 simultaneously and separately, which makes it easy to connect the two conductive parts 22 to the positive electrode post 1201 and the negative electrode post 1202, respectively, and is advantageous for improving production efficiency.

[0203] Referring again to FIG. 4 , the battery cell 10 further includes an insulating member 4, which is connected to the support 3 and wound around the electrode assembly 2. The insulating member 4 can be used to isolate the electrical connection members within the case 11 from the case 11 to reduce the risk of short circuits. For example, the insulating member 4 may be made of plastic, rubber, or the like. Here, the insulating member 4 and the support 3 may be connected by adhesive or hot melt. Of course, the insulating member 4 and the support 3 may also be connected in other ways.

[0204] As shown in FIG. 2, according to some embodiments of the present application, the present application further provides a battery 100 including the battery cell 10 of any of the above solutions.

[0205] In the technical solution of the embodiments of the present application, by using the above-mentioned battery cell 10, the risk of combustion or explosion of the battery cell 10 can be reduced, and the impact on adjacent battery cells 10 can be reduced, which is advantageous for improving the reliability and stability of use of the battery 100.

[0206] As shown in Fig. 1, according to some embodiments of the present application, the present application further provides an electric device 1000 including the battery cell 10 of any of the above solutions or including the battery 100 of any of the above solutions, where the battery 100 is used to supply electric energy to the electric device 1000. The electric device 1000 may be any of the above devices or systems that use the battery 100.

[0207] In the technical solution of the embodiment of the present application, the use of the battery 100 is advantageous to improve the reliability and stability of the use of the electric device 1000 .

[0208] Referring again to Figures 3 to 11, according to some embodiments of the present application, the present application provides a support 3 for a battery cell 10 including a case 11 provided with an explosion-proof valve 6 and an electrode assembly 2 provided within the case 11.

[0209] The support body 3 includes a support body 31, which has a first side 311 and a second side 312 arranged opposite each other in the thickness direction of the support body 31, and an exhaust hole 313 is opened in the support body 31, which passes through the first side 311 and the second side 312 of the support body 31, and which is intended to face the explosion-proof valve 6.

[0210] The support body 3 further includes a first abutment portion 321, which is provided on the first side 311 of the support body body 31 and protrudes in a direction opposite to the second side 312, and which abuts 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 jointly form the first exhaust passage 302.

[0211] In the technical solution of the embodiment of the present application, a first abutment portion 321 is provided on the first side 311 of the support body 31, and the first abutment portion 321 abuts against the end of the electrode assembly 2. This increases the distance between the first side 311 of the support body 31 and the end of the electrode assembly 2, i.e., the distance between the exhaust hole 313 and the end of the electrode assembly 2. This defines a first exhaust passage 302, which communicates with the exhaust hole 313, between the first side 311 of the support body 31 and the end of the electrode assembly 2, improving exhaust capacity. If the battery cell 10 experiences thermal runaway, the generated gas can enter the first exhaust passage 302, then pass through the exhaust hole 313 to the support 3, and finally be discharged through the explosion-proof valve 6, thereby achieving rapid pressure relief. This reduces the risk of combustion or explosion of the battery cell 10 and reduces the impact on adjacent battery cells 10, which is beneficial to improving the reliability and stability of the battery 100.

[0212] In some embodiments, a ventilation notch 315 is opened in the circumferential direction of the support body 3, penetrating the first side 311 and the second side 312, and the support body 3 can be fitted to the case 11 of the battery cell 10 so that a ventilation passage 301 is formed between the ventilation notch 315 and the case 11, and the ventilation passage 301 is connected to the first exhaust passage 302.

[0213] If the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, some of the gas can pass through the exhaust hole 313 and the support 3, and other part of the gas can pass through the ventilation passage 301 and the support 3, and finally be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0214] In the above technical solution, the support 3 is provided with the ventilation notches 315, which define the casing 11 and the ventilation passages 301. On the one hand, gas generated around the electrode assembly 2 can quickly move through the corresponding ventilation passages 301 to the position of the explosion-proof valve 6, improving the immediacy of pressure release of the explosion-proof valve 6. At the same time, the gas in the first exhaust passage 302 can quickly flow to the exhaust hole 313 and the ventilation passage 301, respectively, to achieve instantaneous pressure relief, and finally be discharged through the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of the battery 100. On the other hand, during electrolyte injection, the electrolyte can flow through the ventilation notches 315 to the electrode assembly 2, shortening the impregnation time and improving impregnation efficiency.

[0215] In some embodiments, a first extension portion 331 is further protruded from the first side 311 of the support body 31, and the first extension portion 331 is annularly formed around the circumferential direction of the support body 31 and defines an engagement groove 30 for engaging with the end of the support body 31 and the electrode assembly 2.

[0216] The support 3 and the electrode assembly 2 may be assembled and then mounted together in the case 11, or the support 3 may be attached to the case 11 in advance, and then the electrode assembly 2 may be mounted in the case 11 and fitted with the support 3.

[0217] In an embodiment in which the support body 3 and the electrode assembly 2 are assembled and then mounted together in the case 11, the first extension 331 can protect the electrode assembly 2 during the mounting process, reducing the likelihood of the electrode assembly 2 coming into contact with the case 11 and further reducing the possibility of the case 11 damaging the electrode assembly 2, thereby reducing the likelihood of the active material of the electrode assembly 2 falling off, preventing to some extent an internal short circuit caused by the fallen active material overlapping with sheets of opposite polarity, and preventing to some extent corrosion or penetration of the case 11 due to a chemical reaction between the fallen active material and the case 11, thereby improving the reliability of use of the battery cell 10. Furthermore, the first extension 331 and the electrode assembly 2 can be locked together, preventing to some extent the fall-off of the support body 3 before mounting in the case and improving the production yield of the battery cell 10. After being installed in the case, the first extension portion 331 can restrain one end of the electrode assembly 2, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 swelling. In addition, the one end of the electrode assembly 2 is protected, reducing the problem of the one end of the electrode assembly 2 coming into contact with the case 11. This reduces the phenomenon in which the case 11 damages the electrode assembly 2, and improves the reliability of use of the battery cell 10.

[0218] In an embodiment in which the support 3 is attached to the case 11 in advance and then the electrode assembly 2 is installed inside the case 11, the first extension portion 331 can restrain one end of the electrode assembly 2, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 swelling. In addition, the one end of the electrode assembly 2 is protected, reducing the problem of the one end of the electrode assembly 2 coming into contact with the case 11. This reduces the phenomenon in which the case 11 damages the electrode assembly 2, and improves the reliability of use of the battery cell 10.

[0219] In the above technical solution, by providing the first extension portion 331, one end of the electrode assembly 2 can be restrained, reducing the probability of the outer layer of the active material coating portion 21 of the electrode assembly 2 swelling. In addition, the one end of the electrode assembly 2 is protected, reducing the problem of the one end of the electrode assembly 2 touching the case 11. This reduces the phenomenon of the case 11 damaging the electrode assembly 2, and improves the reliability of use of the battery cell 10.

[0220] Furthermore, since the end of the electrode assembly 2 extends into the fitting groove 30, the distance between the support 3 and the end of the electrode assembly 2 can be shortened, improving the energy density of the battery.

[0221] In some embodiments, the first extension portion 331 and the first abutment portion 321 are spaced apart and jointly form a first guide passage 304, which is for connecting at least one ventilation passage 301 and the first exhaust passage 302.

[0222] On the one hand, the first guide passage 304 can expand the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, it can act as a guide, allowing some of the gas that has entered the first exhaust passage 302 to flow along the first guide passage 304 to the vent passage 301. The gas then passes through the vent passage 301, passes through the support 3, and is finally discharged through the explosion-proof valve 6, thereby realizing pressure relief. This further reduces the risk of combustion or explosion of the battery cell 10 and improves the reliability and stability of use of the battery 100. In addition, the first guide passage 304 can guide the flow of the electrolyte, further shortening the impregnation time and significantly improving impregnation efficiency.

[0223] Here, the number of ventilation notches 315 on both sides of the exhaust hole 313 in the length direction of the support 3 is plural, and the plural ventilation notches 315 located on the same side share one first guide passage 304 .

[0224] That is, the plurality of ventilation notches 315 can be divided into two parts, and the ventilation notches 315 of the two parts are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. Accordingly, the number of first conduction passages 304 is two, and the two first conduction passages 304 are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. In the longitudinal direction of the battery cell 10, the first conduction passage 304 located on one side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions. Meanwhile, the first conduction passage 304 located on the other side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions.

[0225] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas can pass through the exhaust hole 313, pass through the support 3, and flow to the second side 312 of the support body 31; the other part of the gas can be diverted by the two first guide passages 304, and then pass through the multiple ventilation passages 301, pass through the support 3, and flow to the second side 312 of the support body 31, and finally be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0226] In the above technical solution, the gas that enters the first exhaust passage 302 is guided by the two first guide passages 304 to flow to both sides of the exhaust hole 313 in the longitudinal direction of the battery cell 10, thereby achieving instantaneous pressure relief, and then passes through the multiple vent passages 301, passes through the support 3, and is finally discharged through the explosion-proof valve 6, thereby achieving final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. During electrolyte injection, the electrolyte can flow guided by the two first guide passages 304, shortening the impregnation time and improving impregnation efficiency.

[0227] 8 and 9, the first contact portion 321 is provided in an arc shape, and the first contact portion 321 and the first extension portion 331 define the first guide flow passage 304 in an arc shape.

[0228] There are two first abutment portions 321, and the two first abutment portions 321 are located on either side of the exhaust hole 313, respectively. The multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged circumferentially around the corresponding first abutment portion 321 and spaced apart. The multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding first guide passage 304. In this way, the multiple ventilation passages 301 are all connected to the same first guide passage 304, and the gas in the first exhaust passage 302 can flow around the first exhaust passage 302 under the guidance of the two first guide passages 304, pass through the multiple ventilation passages 301, pass through the support 3, and finally be discharged from the explosion-proof valve 6.

[0229] Therefore, in the above technical solution, by providing the first contact portion 321 in an arc shape and providing a plurality of ventilation notches 315 on the same side of the exhaust hole 313 at intervals around the circumferential direction of the corresponding first contact portion 321, it is possible to define the first guide passage 304 in an arc shape, thereby increasing the space occupied by the first guide passage 304, improving the space utilization rate of the support 3, and further improving the exhaust capacity.In addition, the impregnation time can be further shortened, and the impregnation efficiency can be improved.

[0230] 3-4 and 7-8, the support body 31 has two through holes 314 for exposing the positive electrode pole 1201 and the negative electrode pole 1202 of the battery cell 10. The exhaust hole 313 is located between the two through holes 314, and the two first contact portions 321 and the two through holes 314 are provided in a one-to-one correspondence, with each first contact portion 321 being provided around the outer periphery of the corresponding through hole 314.

[0231] In the above technical solution, on the one hand, the first abutment portion 321 can define the first guide passage 304 arranged in an arc shape together with the first extension portion 331, thereby increasing the space occupied by the first guide passage 304, increasing the space utilization rate of the support body 3, and improving the exhaust capacity; on the other hand, because the first abutment portion 321 is arranged around the through hole 314, it can guide the gas in the through hole 314 to flow into the first exhaust passage 302, allowing as much gas as possible in this portion to pass through the support body 3 from the exhaust hole 313, further improving the exhaust capacity.

[0232] Referring again to Figures 10 and 11, the support body 3 further includes a second abutment portion 322 provided on the second side 312 of the support body main body 31 and protruding in a direction opposite to the first side 311, and the second abutment portion 322 abuts against the wall body on which the explosion-proof valve 6 of the case 11 is provided to form a second exhaust passage 303 between the exhaust hole 313 and the wall body, and the second exhaust passage 303 is connected to at least one ventilation passage 301.

[0233] When the battery cell 10 has a tendency toward thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas passes through the support 3 from the exhaust hole 313, and the other part of the gas passes through the support 3 through the ventilation passage 301, and finally gathers in the second exhaust passage 303 and is discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0234] In the above technical solution, a second abutment portion 322 is provided on the second side 312 of the support body 31, and the second abutment portion 322 is abutted against the wall of the case 11 on which the explosion-proof valve 6 is provided, thereby defining a second exhaust passage 303 between the second side 312 of the support body 31 and the wall of the case 11, which increases the space occupied by the exhaust path, improves exhaust capacity, reduces the risk of combustion or explosion of the battery cell 10, and reduces the impact on adjacent battery cells 10, which is advantageous for improving the usage reliability and stability of the battery 100.

[0235] 10 and 11, a second extension portion 332 is further protruded from the second side 312 of the support body 31, and the second extension portion 332 and the second abutment portion 322 are spaced apart to jointly form a second guide passage 305, which is intended to connect at least one ventilation passage 301 and the second exhaust passage 303.

[0236] The second guide passage 305, on the one hand, increases the space occupied by the exhaust path, which is advantageous for improving exhaust capacity, and on the other hand, serves as a guide, allowing some of the gas that has passed through the support 3 from the vent passage 301 to flow along the second guide passage 305 to the second exhaust passage 303 and finally be discharged through the explosion-proof valve 6 to relieve pressure, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. In addition, the second guide passage 305 can guide the flow of the electrolyte, further shortening the impregnation time and significantly improving the impregnation efficiency.

[0237] Here, the number of ventilation notches 315 on both sides of the exhaust hole 313 in the length direction of the support 3 is plural, and the plural ventilation notches 315 located on the same side share one second guide passage 305 .

[0238] That is, the plurality of ventilation notches 315 can be divided into two parts, and the ventilation notches 315 of the two parts are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. Accordingly, the number of second conduction passages 305 is two, and the two second conduction passages 305 are located on either side of the exhaust hole 313 in the longitudinal direction of the battery cell 10. In the longitudinal direction of the battery cell 10, the second conduction passage 305 located on one side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions. The second conduction passage 305 located on the other side of the exhaust hole 313 communicates with the plurality of ventilation notches 315 at corresponding positions, thereby communicating with the plurality of ventilation passages 301 at corresponding positions.

[0239] When the battery cell 10 is prone to thermal runaway, the generated gas can first enter the first exhaust passage 302, and some of the gas can pass through the exhaust hole 313 and pass through the support 3 to the second side 312 of the support body 31. Another part of the gas can pass through the multiple ventilation passages 301 and pass through the support 3 to the second side 312 of the support body 31, then flow along the second guide passage 305, and finally collect in the second exhaust passage 303 and be discharged through the explosion-proof valve 6 to achieve rapid pressure relief.

[0240] During the injection, the electrolyte can flow along the second conducting passage 305 into the plurality of ventilation notches 315. After passing through the ventilation notches 315, the electrolyte first flows along the second conducting passage 304 and then flows to the electrode assembly 2, or can flow directly to the electrode assembly 2, thereby shortening the electrolyte impregnation time and improving the impregnation efficiency.

[0241] In the above technical solution, the gas that has passed through the support 3 can flow to the second exhaust passage 303 through the guidance of the second guide passage 305 and finally be discharged through the explosion-proof valve 6 to achieve final pressure relief, further reducing the risk of combustion or explosion of the battery cell 10 and improving the reliability and stability of use of the battery 100. The electrolyte can flow to the multiple ventilation notches 315 through the guidance of the second guide passage 305, shortening the impregnation time and improving the impregnation efficiency.

[0242] In some embodiments, the second abutting portion 322 is provided in an arc shape, so that the second abutting portion 322 and the second extending portion 332 define the second guide flow passage 305 in an arc shape.

[0243] There are two second abutment portions 322, and the two second abutment portions 322 are located on either side of the exhaust hole 313, and the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are spaced apart around the circumferential direction of the second abutment portion 322, and the multiple ventilation notches 315 located on the same side of the exhaust hole 313 are arranged in the extension direction of the corresponding second guide passage 305. In this way, the multiple ventilation passages 301 are all connected to the same second guide passage 305, and the gas flowing out of the multiple ventilation passages 301 is guided by the second guide passage 305 to collect in the second exhaust passage 303 and can finally be discharged through the explosion-proof valve 6.

[0244] Therefore, in the above technical solution, by providing the second contact portion 322 in an arc shape and providing a plurality of ventilation notches 315 located on the same side of the exhaust hole 313 at intervals around the circumferential direction of the corresponding second contact portion 322, it is possible to define the second guide passage 305 in an arc shape, thereby increasing the space occupied by the second guide passage 305, improving the space utilization rate of the support 3, and further improving the exhaust capacity.In addition, the impregnation time can be further shortened, and the impregnation efficiency can be improved.

[0245] Referring again to Figures 3 to 4 and Figures 10 to 11, the wall of the case 11 on which the explosion-proof valve 6 is provided further has a positive electrode column 1201 and a negative electrode column 1202, and the support body 31 has two through holes 314 for exposing the positive electrode column 1201 and the negative electrode column 1202, and the exhaust hole 313 is located between the two through holes 314, and the two second abutment portions 322 and the two through holes 314 are provided in a one-to-one correspondence, and each second abutment portion 322 is provided around the outer periphery of the corresponding through hole 314.

[0246] In the above technical solution, the second abutment portion 322, on the one hand, can define the second guide passage 305 arranged in an arc shape together with the second extension portion 332, thereby increasing the space occupied by the second guide passage 305, enhancing the space utilization rate of the support body 3, and improving the exhaust capacity; on the other hand, since the second abutment portion 322 is arranged around the through hole 314, it can reduce the backflow of gas from the through hole 314.

[0247] Finally, it should be noted that the above embodiments are merely for illustrating the technical solutions of the present application, and are not intended to limit the same. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art will understand that modifications to the technical solutions described in the above embodiments, or equivalent substitutions for some or all of the technical features thereof, are possible. Such modifications or substitutions do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present application, and are all within the scope of the claims and description of the present application. In particular, as long as there is no structural contradiction, any technical features described in the embodiments can be arbitrarily combined. The present application is not limited to the specific embodiments disclosed herein, and includes all technical solutions within the scope of the claims. [Explanation of symbols]

[0248] The reference numerals in the drawings in the detailed description of the invention are as follows: 1000 Electrical Equipment 100 batteries 200 Controller 300 motor Z 1st direction X 2nd direction Y Third direction R Axial direction of pole 10 battery cells 20 boxes 201 Part 1 202 Part 2 11 cases 111 Case body 1110 Aperture 112 Case Cover 113 Mounting hole 12 Polar Pillar 1201 Positive pole 1202 negative pole 121 Storage unit 12110 First storage groove 12111 1st end wall 12112 First counterbore groove 12113 First side wall 12120 Second storage groove 12121 Second end wall 12122 Second counterbore groove 12123 Second side wall 12130 Beer Hall 122 Pole inner end face 123 Pole column outer end face 126 1st groove 127 Spacing 13 Lid plate 131 first conductive member 1311 Second groove 132 second conductive member 2 electrode assembly 21 Active material application section 22 Conductive part 3 Support 30 Fitting groove 301 Ventilation passage 302 First exhaust passage 303 Second exhaust passage 304 1st diversion passage 305 2nd diversion passage 31 Support body 311 1st side 312 2nd side 313 Exhaust Vent 314 Through hole 315 Ventilation notch 316 Mounting recess 317 Ventilation hole 318 Positioning groove 319 Weight reduction groove 321 1st contact part 322 Second contact part 331 1st extension part 332 Second extension part 4. Insulating materials 6 Explosion-proof valve 7 groove lid

Claims

1. A case (11) provided with an explosion-proof valve (6), an electrode assembly (2) provided in the case (11); a support body (3) including a support body body (31) and a first abutment portion (321); the support body (31) has a first side (311) and a second side (312) that are provided opposite each other in the thickness direction thereof, the support body (31) is provided with an exhaust hole (313) that penetrates the first side (311) and the second side (312), the exhaust hole (313) is for facing the explosion-proof valve (6), and the first abutment portion (321) is provided on the first side (311) and protrudes in a direction opposite to the second side (312), for abutting against an end of the electrode assembly (2) so that a first exhaust passage (302) is formed between the exhaust hole (313) and the end of the electrode assembly (2).

2. 2. The battery cell (10) according to claim 1, characterized in that a ventilation notch (315) penetrating the first side (311) and the second side (312) is opened in the circumferential direction of the support (3), a ventilation passage (301) is formed between the ventilation notch (315) and the case (11), and the ventilation passage (301) and the first exhaust passage (302) are connected to each other.

3. 3. The battery cell (10) according to claim 2, characterized in that a plurality of the ventilation notches (315) are opened and spaced apart in the circumferential direction of the support body (3), one ventilation passage (301) is formed between each of the ventilation notches (315) and the case (11), and the plurality of ventilation passages (301) are arranged in a ring shape around the circumferential direction of the first exhaust passage (302).

4. 3. The battery cell (10) according to claim 2, characterized in that a first extension portion (331) is further provided on the first side (311) of the support body (31), the first extension portion (331) is provided in a ring shape around the circumferential direction of the support body (31) and defines a mating groove (30) together with the support body (31), and the end of the electrode assembly (2) is provided within the mating groove (30).

5. The battery cell (10) according to claim 4, wherein the ventilation notch (315) is provided through the first extension portion (331) and the support body (31).

6. 5. The battery cell (10) according to claim 4, wherein the first extension portion (331) and the first abutment portion (321) are spaced apart to jointly form a first conduction passage (304), and the first conduction passage (304) connects at least one of the ventilation passages (301) and the first exhaust passage (302).

7. 7. The battery cell (10) according to claim 6, wherein the number of the ventilation notches (315) on both sides of the exhaust hole (313) in the longitudinal direction of the battery cell (10) is plural, and the plural ventilation notches (315) located on the same side of the exhaust hole (313) share one of the first conduction passages (304).

8. The battery cell (10) of claim 7, characterized in that the first abutment portions (321) are arranged in an arc shape, there are two of them, each located on both sides of the exhaust hole (313), and the multiple ventilation notches (315) located on the same side of the exhaust hole (313) are arranged around the corresponding first abutment portions (321) at intervals in the circumferential direction.

9. The wall of the case (11) on which the explosion-proof valve (6) is provided further has a positive electrode pole (1201) and a negative electrode pole (1202), and the support body (31) has two through holes (314) that expose the positive electrode pole (1201) and the negative electrode pole (1202), and the exhaust hole (313) is located between the two through holes (314). The battery cell (10) described in claim 8, characterized in that the two first abutment portions (321) and the two through holes (314) are provided in a one-to-one correspondence, and each of the first abutment portions (321) is provided around the outer periphery of the corresponding through hole (314).

10. The battery cell (10) according to any one of claims 2 to 9, characterized in that a second abutment portion (322) protruding in a direction opposite to the first side (311) is provided on the second side (312) of the support body (31), and the second abutment portion (322) abuts against a wall of the case (11) on which the explosion-proof valve (6) is provided to jointly form a second exhaust passage (303), and the second exhaust passage (303) is connected to at least one of the ventilation passages (301).

11. 11. The battery cell (10) of claim 10, further comprising a second extending portion (332) protruding from the second side (312) of the support body (31), the second extending portion (332) and the second abutment portion (322) being spaced apart to jointly form a second conducting passage (305), and the second conducting passage (305) communicating with at least one of the ventilation passages (301) and the second exhaust passage (303).

12. 12. The battery cell (10) according to claim 11, wherein the number of the ventilation notches (315) on both sides of the exhaust hole (313) in the longitudinal direction of the battery cell (10) is plural, and the plural ventilation notches (315) located on the same side share one of the second conduction passages (305).

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

14. 14. The battery cell (10) according to claim 13, characterized in that a vent hole (317) is provided in the side wall of the mounting recess (316) to connect the second conduction passage (305) and the second exhaust passage (303).

15. The battery cell (10) of claim 12, characterized in that the second abutment portions (322) are arranged in an arc shape, there are two of them, each located on both sides of the exhaust hole (313), and the multiple ventilation notches (315) located on the same side of the exhaust hole (313) are arranged circumferentially around the corresponding second abutment portions (322) and spaced apart.

16. The wall of the case (11) on which the explosion-proof valve (6) is provided further has a positive electrode pole (1201) and a negative electrode pole (1202), and the support body (31) has two through holes (314) that expose the positive electrode pole (1201) and the negative electrode pole (1202), and the exhaust hole (313) is located between the two through holes (314). The battery cell (10) of claim 15, characterized in that the two second abutment portions (322) and the two through holes (314) are provided in a one-to-one correspondence, and each second abutment portion (322) is provided around the outer periphery of the corresponding through hole (314).

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

18. The battery cell (10) according to any one of claims 2 to 17, characterized in that the battery cell (10) includes at least two electrode assemblies (2), the at least two electrode assemblies (2) are arranged in a stack, and at least one ventilation notch (315) is provided opposite to a middle position between two adjacent electrode assemblies (2).

19. The wall of the case (11) on which the explosion-proof valve (6) is provided is further provided with a pole (12), and the pole (12) is at least one of a positive pole (1201) and a negative pole (1202), and the support body (31) is provided with a through-hole (314) for exposing the pole (12), and the pole (12) is provided with a receiving section (121) communicating with the through-hole (314), The battery cell (10) according to any one of claims 1 to 8, characterized in that the electrode assembly (2) includes an active material application portion (21) and a conductive portion (22) connected to the active material application portion (21), the support (3) is supported at an end of the active material application portion (21) where the conductive portion (22) is provided, and at least a portion of the conductive portion (22) passes through the through hole (314) and extends into the accommodation portion (121) to be connected to the electrode post (12).

20. The battery cell (10) of claim 19, characterized in that the accommodating portion (121) includes a first accommodating groove (12110), the surface of the pole (12) facing the active material application portion (21) is the pole inner end surface (122), the groove opening of the first accommodating groove (12110) is formed in the pole inner end surface (122), and at least a portion of the conductive portion (22) is accommodated within the first accommodating groove (12110).

21. The battery cell (10) of claim 19, characterized in that the accommodating portion (121) includes a second accommodating groove (12120), the surface of the pole (12) facing away from the active material application portion (21) is the pole outer end surface (123), the groove opening of the second accommodating groove (12120) is formed in the pole outer end surface (123), the second accommodating groove (12120) is connected to the inside of the case (11) through a via hole (12130), and the conductive portion (22) is inserted into the via hole (12130) and is at least partially accommodated within the second accommodating groove (12120).

22. The battery cell (10) of claim 19, characterized in that the electrode poles (12) include two, each being a positive electrode pole (1201) and a negative electrode pole (1202), and the through holes (314) include two, each exposing the positive electrode pole (1201) and the negative electrode pole (1202).

23. The battery cell (10) according to any one of claims 1 to 22, further comprising an insulating member (4), the insulating member (4) being connected to the support (3) and wound together in a circumferential direction of the electrode assembly (2).

24. A battery (100) comprising a battery cell (10) according to any one of claims 1 to 23.

25. An electric device (1000) 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 support (3) for a battery cell (10) including a case (11) provided with an explosion-proof valve (6) and an electrode assembly (2) provided in the case (11), the support (3) including a support body (31) and a first abutment portion (321), The support body (31) has a first side (311) and a second side (312) that are provided opposite to each other in the thickness direction thereof, and the support body (31) is provided with an exhaust hole (313) that penetrates the first side (311) and the second side (312), and the exhaust hole (313) is intended to face the explosion-proof valve (6); The support (3) is characterized in that the first abutment portion (321) is provided on the first side (311) and protrudes in a direction opposite to the second side (312), and is for abutting 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 jointly form a first exhaust passage (302).

27. The support (3) according to claim 26, characterized in that a ventilation notch (315) is opened in the circumferential direction of the support (3) and penetrates the first side (311) and the second side (312), and the ventilation notch (315) forms a ventilation passage (301) between the case (11) and the ventilation notch (315) and communicates the ventilation passage (301) with the first exhaust passage (302).

28. The support (3) according to claim 27, characterized in that a first extension portion (331) is further protruded from the first side (311) of the support body (31), and the first extension portion (331) is annularly formed around the circumferential direction of the support body (31) and defines an engagement groove (30) for engaging the support body (31) with the end portion 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 spaced apart and jointly form a first directing passage (304), and the first directing passage (304) is for connecting at least one of the ventilation passages (301) and the first exhaust passage (302).

30. The support (3) according to claim 29, characterized in that the number of the ventilation notches (315) on both sides of the exhaust hole (313) in the longitudinal direction of the support (3) is plural, and the plural ventilation notches (315) located on the same side share one of the first flow guide passages (304).

31. The support (3) according to claim 30, characterized in that the first abutment portions (321) are arranged in an arc shape, there are two of them, each located on both sides of the exhaust hole (313), and the multiple ventilation notches (315) located on the same side of the exhaust hole (313) are arranged circumferentially around the corresponding first abutment portions (321) and spaced apart from each other.

32. The support body (31) has two through holes (314) for exposing the positive pole (1201) and the negative pole (1202) of the battery cell (10); The support (3) according to claim 31, characterized in that the exhaust hole (313) is located between two of the 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 periphery of the corresponding through hole (314).

33. The support (3) is The support (3) according to claim 27, further comprising a second abutment portion (322) provided on the second side (312), protruding in a direction opposite to the first side (311), for abutting against a wall of the case (11) on which the explosion-proof valve (6) is provided, wherein a second exhaust passage (303) is formed between the exhaust hole (313) and the wall, and the second exhaust passage (303) is connected to at least one of the ventilation passages (301).

34. The support (3) according to claim 33, characterized in that a second extension portion (332) is further protruded from the second side (312) of the support body (31), the second extension portion (332) and the second abutment portion (322) are spaced apart to jointly form a second guide passage (305), and the second guide passage (305) is for connecting at least one of the ventilation passages (301) and the second exhaust passage (303).

35. The support (3) according to claim 34, characterized in that the number of ventilation notches (315) on both sides of the exhaust hole (313) in the longitudinal direction of the support (3) is plural, and the plural ventilation notches (315) located on the same side share one of the second guide passages (305).

36. The support (3) according to claim 35, characterized in that the second abutment portion (322) is formed in an arc shape, there are two of them, each located on both sides of the exhaust hole (313), and the multiple ventilation notches (315) located on the same side of the exhaust hole (313) are arranged circumferentially around the second abutment portion (322) and spaced apart.

37. The wall of the case (11) on which the explosion-proof valve (6) is provided further has a positive electrode pole (1201) and a negative electrode pole (1202), and the support body (31) has two through holes (314) that expose the positive electrode pole (1201) and the negative electrode pole (1202), and the exhaust hole (313) is located between the two through holes (314). The support (3) described in claim 36, characterized in that the two second abutment portions (322) and the two through holes (314) are provided in a one-to-one correspondence, and each of the second abutment portions (322) is provided around the outer periphery of the corresponding through hole (314).

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