Battery monomer, battery pack and electric equipment

Abstract

The invention relates to the technical field of batteries, and provides a battery monomer, a battery pack and electric equipment, and the battery monomer comprises a shell, a battery cell assembly and a stop frame. The shell comprises a shell body and a pole connected to the shell body. The battery cell assembly is arranged in the shell and comprises a battery cell body and a battery cell tab led out from the battery cell body; the stop frame is arranged in the shell, the stop frame is located between the battery cell body and the pole, a gap is formed between the pole and the stop frame, and the battery cell tab is clamped between the stop frame and the pole. The battery monomer provided by the invention can avoid the problem of short circuit during assembly.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery pack, and an electrical device. Background Art

[0002] In recent years, with the rapid development and popularization of new energy vehicles, the application of batteries has become increasingly widespread. Batteries play an irreplaceable role as the power source for electrical devices such as automobiles. Typically, multiple battery cells are integrated into a single housing along with thermal management systems, battery management systems, and other components to form a battery pack, which is used to power the vehicle.

[0003] The battery cell in the related technology mainly includes a shell, a pole and a cell assembly, wherein the cell assembly has positive and negative pole tabs, and the shell has positive and negative pole posts. When assembling the battery cell, the positive and negative pole posts are directly or indirectly welded to the positive and negative pole tabs respectively to lead out the electrical energy of the cell assembly.

[0004] When welding the poles and tabs in the related technology, welding slag can easily flow into the interior of the battery cell assembly, causing risks such as short circuit and self-discharge. Summary of the Invention

[0005] The present application provides a battery cell, a battery pack, and an electrical device that can avoid the risks of short circuit and self-discharge during assembly.

[0006] The first aspect of the present application provides a battery cell comprising a housing, a cell assembly, and a retaining frame. The housing comprises a shell and a terminal connected to the shell. The cell assembly is disposed within the shell and comprises a cell body and a cell tab extending from the cell body. The retaining frame is disposed within the shell and positioned between the cell body and the terminal, with a gap provided between the terminal and the retaining frame. The cell tab is sandwiched between the retaining frame and the terminal.

[0007] According to the battery cell of the first aspect of the present application, the cell tab is located between the stopper and the terminal. When welding the cell tab and the bottom end of the terminal, the stopper is isolated between the cell tab and the cell body. The welding slag generated by the welding of the cell tab and the terminal is blocked by the stopper, making it difficult for the welding to flow into the cell body, thereby avoiding the risk of short circuit and self-discharge caused by the welding slag flowing into the cell body. In addition, by providing the stopper, the stopper can block the cell tab and the cell body, thereby isolating the cell tab and the cell body, and preventing the cell tab and the cell body from overlapping and shorting.

[0008] In a possible implementation, the size of the gap between the pole and the stopper is equal to the thickness of the battery cell tab.

[0009] In a possible implementation, the stop frame includes a frame body connected to the battery cell body, a lead-out hole is passed through the frame body, and the battery cell tab is inserted into the lead-out hole.

[0010] In a possible implementation, the frame is in the shape of a flat plate, and the frame is a combination of one or more shapes including square, circular, and oval.

[0011] In one possible implementation, the lead-out hole is arranged opposite to the connection position between the battery cell tab and the battery cell body.

[0012] In one possible implementation, the dimension of the lead-out hole in the cross-sectional width direction is greater than or equal to the thickness of the battery cell tab.

[0013] In a possible implementation, a plurality of cell tabs are led out from the cell body, and the stop frame is provided with a lead-out hole. The plurality of cell tabs are converged and passed through the lead-out hole.

[0014] In one possible implementation, the battery cell assembly has a plurality of battery cell tabs, and the retaining frame is provided with a plurality of spaced lead-out holes, each of which is used to pass at least one battery cell tab.

[0015] In one possible implementation, the stop frame is further provided with a penetrating liquid injection hole, the pole includes a column and a sealing cover, a guide hole is penetrated through the column at the position corresponding to the liquid injection hole, and the sealing cover is provided on the column and is used to seal the guide hole.

[0016] In a possible implementation, a liquid injection groove is further provided on the end surface of the stop frame facing away from the pole, one end of the liquid injection groove is connected to the liquid injection hole, and the other end of the liquid injection groove extends to the edge of the stop frame.

[0017] In a possible implementation, a plurality of liquid injection grooves are provided on the stop frame, and one end of the plurality of liquid injection grooves converges at the liquid injection hole and radiates toward the surrounding areas with the liquid injection hole as the center.

[0018] In a possible implementation, a guide portion is provided on the end surface of the pole facing the stop frame, the guide portion is passed through the liquid injection hole, and the guide hole is provided through the guide portion.

[0019] In one possible implementation, the column includes at least a first column and a second column connected together, the first column is arranged around the second column, the first column and the second column are surrounded to form a top groove, the guide hole passes through the second column, and the guide hole is connected to the top groove.

[0020] In a possible implementation, an abutment groove is provided at one end of the first column away from the second column, the abutment groove is connected to the top groove, and the sealing cover overlaps the abutment groove.

[0021] In one possible implementation, an abutment surface and a peripheral surface are provided at one end of the first column away from the second column, and both the abutment surface and the peripheral surface are arranged around the top groove. One end of the abutment surface is connected to the peripheral surface, and the other end extends to the top groove. There is a predetermined angle between the abutment surface and the peripheral surface to form an abutment groove.

[0022] In a possible implementation, the abutting surface is parallel to or has a predetermined angle with the top surface of the first cylinder, and the predetermined angle between the peripheral surface and the abutting surface is greater than or equal to 90°.

[0023] In one possible implementation, either the stop frame or the pole is provided with a clearance groove, and the other is provided with a protrusion, which is inserted into the clearance groove, and the side wall of the protrusion is completely or partially fitted with the side wall of the clearance groove.

[0024] In one possible implementation, a clearance groove is provided on the end face of the pole facing the stop frame and is facing away from the stop frame, and a protrusion is provided on the end face of the stop frame facing the pole and is convex toward the pole, and part of the lead-out hole passes through the protrusion, and the battery cell ear located between the stop frame and the pole is located within the range of the clearance groove.

[0025] In one possible implementation, when the protrusion is inserted into the clearance groove, the peripheral wall of the protrusion fits the inner wall of the clearance groove;

[0026] The circumferential wall of the protrusion is an inward-concave arc surface, and the inner side wall of the recess is an outward-convex arc surface structure;

[0027] Alternatively, the peripheral wall of the protrusion is an outwardly convex arc surface structure, and the inner side wall of the relief groove is an inwardly concave arc surface structure.

[0028] In a possible implementation, a through-hole is provided on the shell, the pole is passed through the through-hole, and the portion where the pole passes through the through-hole and the shell are tightly fitted.

[0029] In a possible implementation, a seal is further included. The seal is annularly arranged, at least a portion of the seal passes through the through-hole, and the seal is located at the through-hole and clamped between the pole and the wall of the through-hole.

[0030] In one possible implementation, the seal includes a first sealing portion and a second sealing portion connected together, the first sealing portion is arranged through the through hole and is clamped between the hole wall of the through hole and the pole, and the second sealing portion is located in the shell and is clamped between the inner wall of the shell and the structure of the pole located in the shell.

[0031] In one possible implementation, a ring groove is formed on the peripheral wall of the pole away from the stop frame, and a connecting piece is also formed around the end of the pole away from the stop frame. The connecting piece has a convex edge at the position corresponding to the ring groove, and the convex edge is inserted into the ring groove.

[0032] In one possible implementation, an insulating member is further included, which includes a first insulating portion, a second insulating portion, and an edge portion. The first insulating portion is clamped between the pole and the hole wall of the perforation, the second insulating portion is clamped between the connector and the shell, and the edge portion is arranged on the peripheral wall of the connector facing away from the pole.

[0033] In one possible implementation, a top spacer is further included, which is located between the outer shell and the battery cell body. The top spacer includes a base and a top plate. The top plate is penetrated by a through hole, and the pole is inserted into the through hole. The stop frame is located in the space enclosed between the base and the top plate.

[0034] In one possible implementation, the battery cell assembly also includes a diaphragm, which is located in the battery cell body. The thickness of the stop frame is set to H, H = H5-H6-H7-H8*(20%~90%)-H9(5%-70%), wherein H5 represents the effective space between the pole and the bottom of the shell, H6 represents the height of the structure set at the bottom of the shell, and H7 represents the size of the positive and negative electrode material areas in the battery cell body; H8 and H9 respectively represent the size of the upper part of the diaphragm exceeding the material area and the size of the lower part of the diaphragm exceeding the material area.

[0035] A second aspect of the present application provides a battery pack comprising the above-mentioned battery cell.

[0036] A third aspect of the present application provides an electrical device, including an electrical device, the above-mentioned battery cell or the above-mentioned battery pack, where the battery pack is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0038] Figure 1 shows a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0039] Figure 2 shows a cross-sectional view of a battery cell provided in some embodiments of the present application;

[0040] Figure 3 A schematic structural diagram of a top spacer provided in some embodiments of the present application is shown;

[0041] Figure 4 shows a cross-sectional view of a battery cell body provided in some embodiments of the present application;

[0042] Figure 5 Shown Figure 2 A magnified schematic diagram of point A in the middle;

[0043] Figure 6 A schematic structural diagram of a stop frame provided in some embodiments of the present application is shown;

[0044] Figure 7 A schematic structural diagram of another stop frame provided in some embodiments of the present application is shown;

[0045] Figure 8 shows a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0046] Figure 9 A schematic structural diagram of another stop frame provided in some embodiments of the present application is shown;

[0047] Figure 10 shows a cross-sectional view of a stop frame provided in some embodiments of the present application;

[0048] Figure 11 shows a partial structural schematic diagram of a pole provided in some embodiments of the present application;

[0049] Figure 12 shows a partial cross-sectional view of a pole provided in some embodiments of the present application;

[0050] Figure 13 A schematic structural diagram of a sealing member provided in some embodiments of the present application is shown;

[0051] Figure 14 A schematic structural diagram of a connector provided in some embodiments of the present application is shown;

[0052] Figure 15 A schematic structural diagram of an insulating member provided in some embodiments of the present application is shown;

[0053] Figure 16 A cross-sectional view of an insulating member provided in some embodiments of the present application is shown.

[0054] Reference numerals:

[0055] 10. Housing; 11. First housing; 111. Perforation; 12. Second housing; 13. Bottom shelf; 14. Pole; 140. Column; 141. First column; 1411. Abutment surface; 1412. Peripheral surface; 1413. Abutment groove; 1414. Annular groove; 142. Second column; 1421. Guide portion; 1422. Guide hole; 143. Relief groove; 144. Sealing cover; 145. Top groove;

[0056] 20. Battery cell assembly; 21. Battery cell body; 22. Battery cell tab; 23. Insulation film; 24. Diaphragm;

[0057] 30. Stop frame; 31. Frame body; 32. Lead-out hole; 33. Liquid injection hole; 34. Liquid injection groove; 35. Protrusion;

[0058] 40. Top shelf; 41. Base; 42. Top plate; 421. Through hole;

[0059] 50. Sealing member; 51. First sealing portion; 52. Second sealing portion;

[0060] 60. Insulating member; 61. First insulating portion; 62. Second insulating portion; 63. Edge portion;

[0061] 70. Connector; 71. Raised edge. DETAILED DESCRIPTION

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0063] The embodiment of the present application provides a battery pack and an electrical device having the battery pack, wherein the battery pack is used to power the electrical device, wherein the electrical device includes an electrical device, and the battery includes a device that can provide electrical energy to the electrical device. In the embodiment of the present application, the electrical device can be a vehicle. Based on the design of the battery pack in the embodiment of the present application, the vehicle has stronger power performance and power stability. The vehicle can be a car, a bus, or a truck. For example, the vehicle can be an electric vehicle / electric vehicle (Electric Vehicle; abbreviated as: EV), a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviated as: PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviated as: HEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviated as: REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle; abbreviated as: PHEV), a new energy vehicle (New Energy Vehicle) and any vehicle with a battery. The battery pack includes a box and the above-mentioned battery cells, and the battery cells are located in the box.

[0064] The battery pack is equipped with cell modules, connectors, a battery management system (BMS), a battery thermal management device, necessary structural support bodies and structural protection bodies. Among them, the battery module is a modular battery pack formed by connecting multiple battery cells in series or in parallel, and adding auxiliary structural parts that play the role of collecting current, collecting data, fixing and protecting battery cells. With the advancement of battery technology and the improvement of the quality of battery cells, CTP (Cell to Pack) technology has emerged to break through the bottleneck of balancing the structural rigidity and reliability of the battery pack. In this way, CTP uses battery cells to directly form a battery pack, eliminating the battery module structure. In this way, less structural parts that cannot supply energy can be used, freeing up more space for battery cells, improving the energy density of the battery system, and helping to improve vehicle endurance.

[0065] A battery cell primarily consists of a housing, poles mounted on the housing, and a cell assembly within the housing. The cell assembly, as the primary structure of the battery cell, primarily includes positive and negative electrode sheets and insulating films that insulate the sheets. The positive and negative electrode sheets can each lead to a positive and negative tab, which can be welded directly or indirectly to the positive and negative poles on the housing to facilitate the poles in extracting the electrical energy from the cell.

[0066] In the related art, when welding the tabs and posts, there is no obstruction between the welding position and the battery cell assembly. Therefore, welding slag can easily flow directly into the battery cell assembly, which can easily cause the battery cell assembly to short-circuit and self-discharge. In response to the above problems, the present embodiment provides a battery cell. The battery cell is provided with a blocking structure between the tabs and the battery cell assembly. When the tabs and posts are welded, the welding slag can flow onto the blocking structure. The blocking structure can prevent the welding slag from flowing into the battery cell assembly, thereby ensuring that the battery cell assembly will not short-circuit and self-discharge.

[0067] Figure 1 shows a schematic structural diagram of a battery cell provided in some embodiments of the present application, Figure 2 shows a cross-sectional view of a battery cell provided in some embodiments of the present application, Figure 3 Schematic diagram of the structure of the top partition frame 40 provided in some embodiments of the present application is shown. Figure 4 A cross-sectional view of a diaphragm provided in some embodiments according to the present application is shown.

[0068] In some embodiments, please refer to Figures 1 to 4In a first aspect of an embodiment of the present application, a battery cell is provided. The battery cell includes a shell 10, a battery cell assembly 20 and a stop frame 30. The shell 10 includes a shell and a pole 14 connected to the shell. A receiving cavity is provided inside the shell. The battery cell assembly 20 and the stop frame 30 can be loaded into the receiving cavity. A seal is provided between the shell and the pole 14, so that the entire shell is a sealed structure, so that the electrolyte can be filled and stored inside the shell.

[0069] It should be noted that, as an example, the housing cavity of the housing can be provided with an opening, and the pole 14 is connected to the opening. Before the pole 14 is connected to the opening of the housing, the battery cell assembly 20 and the stopper 30 can be placed into the housing through the opening of the housing cavity to achieve assembly of the housing and the battery cell assembly 20.

[0070] As another example, the shell may also include at least a first shell 11 and a second shell 12, and a accommodating cavity is formed between the first shell 11 and the second shell 12. The first shell 11 and the second shell 12 can be welded together. Before the first shell 11 and the second shell 12 are welded, the battery cell assembly 20 and the stop frame 30 can be first arranged between the first shell 11 and the second shell 12, and then the first shell 11 and the second shell 12 are welded together to assemble the battery cell assembly 20 and the shell together.

[0071] The cell assembly 20, the main structure of a battery cell, is located inside the housing. The cell assembly 20 includes a cell body 21 and a cell tab 22 extending from the cell body 21. The cell body 21 primarily includes a positive electrode sheet, a negative electrode sheet, and an insulating separator disposed between the positive and negative electrode sheets. The positive electrode sheet has a lead-out portion that forms the positive electrode tab, and the negative electrode sheet also has a lead-out portion that forms the negative electrode tab. A battery cell has at least one positive electrode tab and one negative electrode tab.

[0072] The pole 14 on the shell is used to electrically connect to the tab of the battery cell assembly 20. The shell has at least one positive pole 14 and one negative pole 14. The positive pole 14 can be directly or indirectly welded to the positive tab, and the negative pole 14 can be directly or indirectly welded to the negative tab. The positive pole 14 and the negative pole 14 extend out of the shell 10 at one end away from the tab.

[0073] The stopper 30 is disposed within the housing. A gap is provided between the end of the cell body 21 facing the terminal 14 and the terminal 14. The stopper 30 is located in the gap between the cell body 21 and the terminal 14 and is connected to the cell body 21. A gap is provided between the terminal 14 and the stopper 30, and one end of the cell tab 22 can extend to be sandwiched between the stopper 30 and the terminal 14.

[0074] It is worth mentioning that the battery cell assembly 20 also includes an insulating film 23 wrapped around the outside of the battery cell body 21. A top spacer 40 is also provided in the housing 10, and the top spacer 40 is located between the housing 10 and the battery cell body 21. The top spacer 40 includes a base 41 and a top plate 42. The base 41 is connected to one end surface of the top plate 42. The end surface of the base 41 facing away from the top plate 42 is attached to the insulating film 23 outside the battery cell body 21, and the end surface of the top plate 42 facing away from the base 41 can be attached to the inner wall of the housing 10.

[0075] The base 41 of the spacer 40 can be connected to the insulating film 23 of the battery cell assembly 20, and the top plate 42 of the top spacer 40 can be connected to the inner wall of the outer shell 10. In this way, the battery cell assembly 20 can be connected to the outer shell 10 through the top spacer 40, so that the battery cell assembly 20 can be fixed in the outer shell 10.

[0076] In addition, the top plate 42 is located in the extension direction of the pole 14. To this end, a through-hole 421 is also penetrated in the top plate 42, so that part of the structure of the pole 14 can be inserted into the through-hole 421. The base 41 has a certain height. Therefore, when the base 41 is arranged between the top plate 42 and the battery cell assembly 20, a gap is formed between the top plate 42 and the battery cell assembly 20. At this time, an accommodating space is formed between the base 41, the top plate 42, and the insulating film 23 of the battery cell assembly 20. The retaining frame 30 and part of the structure of the pole 14 can be accommodated in this accommodating space.

[0077] The housing 10 is also provided with an explosion-proof valve (not shown in the figure). The explosion-proof valve is used to relieve pressure inside the housing 10. The explosion-proof valve is provided on the first shell 11 or the second shell 12. The explosion-proof valve can be provided at the end of the housing 10 where the pole 14 is provided, or it can be provided at the end of the housing 10 away from the pole 14. The second shell 12 is also provided with a bottom spacer 13. When the explosion-proof valve is provided on the second shell 12, the explosion-proof valve is located between the bottom spacer 13 and the second shell 12.

[0078] The cell tab 22 of the present application is located between the stop frame 30 and the pole 14. When welding the cell tab 22 and the bottom end of the pole 14, since the stop frame 30 is isolated between the cell tab 22 and the cell body 21, the welding slag generated when welding the cell tab 22 and the pole 14 is blocked by the stop frame 30, making it difficult for the welding to flow into the cell body 21, thereby avoiding the risk of short circuit and self-discharge caused by the welding slag flowing into the cell body 21. In addition, by providing the stop frame 30, the stop frame 30 can be blocked between the cell tab 22 and the cell body 21, so that the cell tab 22 and the cell body 21 are insulated and prevented from overlapping and short-circuiting the cell tab 22 and the cell body 21.

[0079] It should be noted that the present application solution is applicable to various types of battery cells, such as square batteries, blade batteries and cylindrical batteries, etc. In this application, square batteries are used as an example for explanation.

[0080] Figure 5 Shown Figure 2 Enlarged schematic diagram of point A in the middle.

[0081] See also Figure 2 and Figure 5 As shown, in some embodiments, the bottom end of the pole 14 and the top end of the stop frame 30 are directly opposite each other. Here, the bottom end of the pole 14 can be regarded as the end surface of the pole 14 facing the stopper, and the top end of the stop frame 30 can be regarded as the end surface facing the pole 14. There is a gap between the bottom end of the pole 14 and the top end of the stop frame 30. The size of the gap is set to at least accommodate the battery cell tab 22.

[0082] It should be noted that the battery cell tab 22 can extend between the stop frame 30 and the pole 14, and the bottom end of the pole 14 and the top end of the stop frame 30 are at least partially overlapped, and the battery cell tab 22 is located between the overlapping positions of the two. In this way, the battery cell tab 22 can be welded to the overlapping position of the pole 14 and the stop frame 30 by penetration welding, and the welding slag generated during the welding process can be blocked by the structure on the stop frame 30 that overlaps with the pole 14.

[0083] For example, when the end of the battery cell tab 22 extends between the stop frame 30 and the pole 14, it can be partially bent. At this time, the bent part of the battery cell tab 22 can be fitted to the bottom end of the pole 14 and then welded together. At this time, the gap between the stop frame 30 and the pole 14 is greater than the thickness of the battery cell tab 22.

[0084] For example, when the end of the battery cell tab 22 extends between the stop frame 30 and the pole 14, the portion of the battery cell tab 22 located between the stop frame 30 and the pole 14 can be bent relative to the rest of the portion. At this time, the opposite ends of the bent portion of the battery cell tab 22 can be respectively fitted to the bottom end of the pole 14 and the top end of the stop frame 30, and then the battery cell tab 22 and the bottom end of the pole 14 are welded together. At this time, the gap between the stop frame 30 and the pole 14 is equal to the thickness of the battery cell tab 22.

[0085] By bending the battery cell tab 22 located between the stop frame 30 and the pole 14 and welding the bent part to the pole 14, not only can the welding area between the battery cell tab 22 and the bottom end of the pole 14 be increased, but also the space occupied by the battery cell tab 22 can be reduced, thereby facilitating the reduction of the gap between the stop frame 30 and the pole 14 and making the stop frame 30 and the pole 14 more compact.

[0086] Alternatively, the cell tab 22 located between the stopper 30 and the terminal 14 can be bent completely so that its opposite ends fit over the top of the stopper 30 and the bottom of the terminal 14, respectively. This minimizes the gap between the stopper 30 and the terminal 14, contributing to a more compact structure. Furthermore, the cell tab 22 can be clamped between the stopper 30 and the terminal 14, keeping the tab relatively fixed and preventing the risk of rupture due to fatigue damage when the cell vibrates.

[0087] In the embodiment of the present application, the entire bending arrangement of the cell tab 22 located between the stop frame 30 and the pole 14 is taken as an example for description.

[0088] Figure 6 FIG. 1 shows a schematic structural diagram of a stop frame 30 provided in some embodiments of the present application. Figure 7 FIG. 1 shows a schematic structural diagram of another stop frame 30 provided in some embodiments of the present application. Figure 8 A partial cross-sectional view of a battery cell provided in some embodiments of the present application is shown.

[0089] See also Figures 6 to 8 As shown, in some embodiments, the retaining frame 30 includes a frame body 31, which is connected between the battery cell body 21 and the terminal 14. It should be noted that the battery cell tab 22 on the battery cell body 21 has a lead-out position extending from the battery cell body 21, which can also be regarded as the connection position between the battery cell tab 22 and the battery cell body 21.

[0090] As an example, after being led out, the battery cell tab 22 can extend along the lower surface of the frame 31 of the stop frame 30, and then extend from the peripheral wall of the frame 31 to the top of the frame 31. At this time, the battery cell tab 22 is located between the top of the frame 31 and the bottom end of the pole 14.

[0091] For example, the edge of the frame 31 is positioned near the lead-out position of the cell tab 22, so that the cell tab 22 can extend directly along the peripheral wall of the frame 31 in the lead-out direction after being led out. The cell tab 22 located between the frame 31 and the pole 14 is then bent and positioned so as to be sandwiched between the frame 31 and the pole 14. By positioning the edge of the frame 31 of the stop frame 30 near the lead-out position of the cell tab 22, the lead-out length of the cell tab 22 can be reduced, thereby preventing the cell impedance of the cell assembly 20 from being affected by the longer length of the cell tab 22.

[0092] As another example, a lead-out hole 32 is passed through the frame 31 , and the cell tab 22 can be passed through the lead-out hole 32 . The cell tab 22 extends through the lead-out hole 32 to between the frame 31 and the pole 14 .

[0093] For example, when the frame 31 is located between the electrode 14 and the cell body 21, the lead-out hole 32 can be arranged directly opposite the lead-out position of the cell tab 22, so that the cell tab 22 can be directly passed through the lead-out hole 32 along the lead-out direction after being led out. This can shorten the extension path required for the cell tab 22 to extend between the frame 31 and the electrode 14, thereby reducing the length of the cell tab 22.

[0094] In addition, by providing the lead-out hole 32, the lead-out hole 32 is provided on the frame 31, so that the edge of the frame 31 can be extended as much as possible so that the frame 31 covers a larger area. This is conducive to the frame 31 covering the entire battery cell body 21, making it more difficult for welding slag to flow into the battery core material.

[0095] It should be noted that the shape and overall structural type of the frame 31 are not limited. For example, the frame 31 can be flat or irregular in shape. The shape of the frame 31 can be square, round or oval, or the frame 31 can be a combination of square, round and oval shapes.

[0096] In the embodiment of the present application, the frame 31 is a flat plate structure, and the end surface of the frame 31 facing the pole 14 and the end surface of the frame 31 facing away from the pole 14 are arranged in parallel, so that the thickness of the frame 31 is uniform between the end surface facing the pole 14 and the end surface facing away from the pole 14. In the present application, the outer shape of the frame 31 is square.

[0097] The frame 31 is set as a flat plate structure with its upper and lower ends arranged in parallel, so that the size of the frame 31 in the thickness direction is uniform. This can ensure that the gap size between the frame 31 and the pole 14 is uniform, and is also beneficial to reducing the space occupied by the frame 31, which is beneficial to making the structure inside the shell more compact.

[0098] In some embodiments, the shape and size of the lead-out hole 32 are not limited. For example, the cross-section of the lead-out hole 32 can be square, or a combination of multiple shapes. When the cross-section of the lead-out hole 32 is square, the cross-sectional size of the lead-out hole 32 can be equal to the thickness of the battery cell tab 22, or can be greater than the thickness of the battery cell tab 22.

[0099] In addition, the cross-sectional shape of the lead-out hole 32 can also be an isosceles trapezoid, and the size of the lead-out hole 32 near the battery cell body 21 is larger than the size of the lead-out hole 32 near the terminal 14. In this case, the size of the lead-out hole 32 can gradually decrease from the end near the battery cell body 21 to the end near the terminal 14, or the size can first gradually decrease from the end near the battery cell body 21 to the end near the terminal 14 and then remain unchanged.

[0100] In some embodiments, the cell body 21 can lead out one or more cell tabs 22 . When one cell tab 22 is led out from the cell body 21 , a lead-out hole 32 can be provided on the stop frame 30 , and one cell tab 22 is passed through the lead-out hole 32 .

[0101] In addition, when the battery body 21 leads out multiple battery tabs 22, the multiple battery tabs 22 can be brought close to each other and gathered together. At this time, the stop frame 30 can be provided with a lead-out hole 32, and the multiple battery tabs 22 are merged and passed through the same lead-out hole 32.

[0102] For example, when multiple cell tabs 22 are provided and one lead-out hole 32 is provided, the multiple cell tabs 22 are stacked and arranged in a predetermined direction. In this case, the convergence position of the multiple cell tabs 22 can be set in the middle of the cell tabs 22 located at the two ends, or in the cell tab 22 located near one end. The position of the lead-out hole 32 on the frame 31 is determined according to the convergence position of the cell tabs 22. The lead-out hole 32 is provided at the position where the frame 31 is directly opposite the convergence position of the multiple cell tabs 22, which can reduce the length of the cell tabs 22.

[0103] When there are multiple cell tabs 22, multiple lead-out holes 32 can be further provided on the frame 31. The multiple lead-out holes 32 are spaced apart and parallel to each other. In this case, the adjacent cell tabs 22 among the multiple cell tabs 22 can be divided into several regions, each region including at least one cell tab 22. The cell tabs 22 in each region are gathered together, and the cell tabs 22 in each region correspond to one lead-out hole 32, so that the gathered cell tabs 22 can extend from the lead-out hole 32 to between the frame 31 and the pole 14.

[0104] By providing multiple lead-out holes 32, when there are multiple cell tabs 22 to be led out, the cell tabs 22 can be divided into multiple areas, and the cell tabs 22 in each area correspond to one lead-out hole 32. Compared to requiring all cell tabs 22 to be led out from one lead-out hole 32, the embodiment of the present application provides multiple lead-out holes 32, which can be arranged according to the position of the cell tabs 22, which helps to reduce the extension length of the cell tabs 22 and avoid affecting the cell impedance. In addition, providing multiple lead-out holes 32 on the frame 31 not only saves the material used for the frame 31, thereby reducing costs, but also reduces the weight of the frame 31.

[0105] In some embodiments, a liquid injection hole 33 is also passed through the frame body 31 of the stop frame 30, and the pole 14 includes a column 140 and a sealing cover 144. The bottom end of the column 140 is opposite to the top end of the frame body 31, and a guide hole 1422 is passed through the position of the column 140 corresponding to the liquid injection hole 33. The sealing cover 144 can be covered on the column 140 and used to seal the guide hole 1422.

[0106] It should be noted that the battery cell assembly 20 generally has at least a positive electrode post 14 and a negative electrode post 14. When setting them up, a guide hole 1422 can be provided on only one of the posts 14, and a liquid injection hole 33 can be provided on the frame 31 of the retaining frame 30 corresponding to the post 14, so as to meet the requirements of injecting electrolyte into the housing 10. Alternatively, guide holes 1422 can be provided on both posts 14, and liquid injection holes 33 can be provided on the frames 31 corresponding to the two posts 14. In this way, the interior of the housing 10 can be filled with electrolyte through the cooperation of the two guide holes 1422 and the liquid injection hole 33. In the embodiment of the present application, the guide hole 1422 is provided on the positive electrode post 14, and the liquid injection hole 33 is provided on the frame 31 corresponding to the positive electrode post 14.

[0107] By providing a guide hole 1422 on the pole 14 and an injection hole 33 on the frame 31, the electrolyte can be injected from the guide hole 1422 into the injection hole 33 from the outside, and then injected into the interior of the shell 10 through the column liquid hole to achieve electrolyte filling. There is no need to provide an injection hole 33 on the shell 10 or the sealing cover 144, thereby improving the efficiency of manufacturing the battery cell assembly 20.

[0108] It should be noted that in the embodiment of the present application, the frame 31 is injection-molded by an insulating material. Because a gap is provided between the frame 31 and the pole 14, when the electrolyte is transported into the housing 10 using the guide hole 1422 and the injection hole 33, the electrolyte is more likely to splash onto the frame 31, which may cause corrosion of the frame 31, affect the service life of the frame 31, and cause a short circuit in the battery cell assembly 20. In order to ensure that the electrolyte transported from the guide hole 1422 fully flows into the shell 10 from the injection hole 33, and to avoid electrolyte leakage causing corrosion of the frame 31 or telecommunication short circuit, the aperture of the injection hole 33 can be set to be larger than the aperture of the guide hole 1422, and the orthographic projection of the open end of the guide hole 1422 close to the frame 31 on the frame 31 is all located within the range of the injection hole 33. In this way, when the electrolyte flows out of the guide hole 1422 and flows toward the injection hole 33, it is conducive to the sufficient flow of the electrolyte into the injection hole 33, and it is not easy for the electrolyte to splash onto the frame 31.

[0109] In some possible implementations, a guide portion 1421 may be protruded from the end surface of the terminal 14 facing the frame 31. The guide portion 1421 is disposed directly opposite the injection hole 33, and the guide hole 1422 extends through the guide portion 1421. When the frame 31 is disposed between the battery cell body 21 and the terminal 14, the guide portion 1421 may be inserted into the injection hole 33. In this manner, by inserting and mating the guide portion 1421 into the injection hole 33, the electrolyte in the guide hole 1422 can more fully flow from the injection hole 33 into the housing 10 without leaking onto the frame 31.

[0110] Of course, in other possible implementations, a guide portion 1421 may be protruded from the end surface of the frame 31 facing the terminal 14, with the guide portion 1421 located at the position of the injection hole 33, and the injection hole 33 passes through the guide portion 1421. In this case, the guide portion 1421 may directly abut the end surface of the terminal 14 facing the frame 31, and the guide portion 1421 may completely cover the guide hole 1422. Alternatively, the guide portion 1421 may be inserted into the guide hole 1422, with the outer wall of the guide portion 1421 closely contacting the inner wall of the guide hole 1422.

[0111] Figure 9 FIG. 2 shows a structural diagram of another stop frame 30 provided in some embodiments of the present application. Figure 10 A cross-sectional view of a stop bracket 30 provided in some embodiments of the present application is shown.

[0112] Please also see Figures 8 to 10 As shown, in some embodiments, the end surface of the frame 31 of the retaining frame 30 facing away from the terminal 14 further includes a liquid injection groove 34. One end of the liquid injection groove 34 is connected to the liquid injection hole 33, and the other end of the liquid injection groove 34 extends to the edge of the retaining frame 30 and is connected to the accommodating cavity within the housing 10. The provision of the liquid injection groove 34 on the frame 31 creates a gap between the frame 31 and the battery cell body 21. When the electrolyte is supplied through the liquid injection hole 33, it flows into the liquid injection groove 34 and then into the interior of the housing 10. The liquid injection groove 34 guides the electrolyte, facilitating electrolyte infiltration. Furthermore, the provision of the liquid injection groove 34 on the frame 31 reduces the material used for the frame 31, thereby reducing the manufacturing cost and weight of the frame 31.

[0113] For example, the frame 31 may be provided with a plurality of injection grooves 34, with one end of the plurality of injection grooves 34 converging at the injection hole 33 and the plurality of injection grooves 34 radiating outward from the injection hole 33. By providing a plurality of injection grooves 34, the plurality of injection grooves 34 form a plurality of electrolyte diversion channels for guiding the electrolyte toward the periphery of the injection hole 33, thereby making it easier for the electrolyte to penetrate.

[0114] It should be noted that the injection hole 33 can be a circular through hole or a square through hole. In the embodiment of the present application, the injection hole 33 is a circular through hole, and multiple injection grooves 34 are arranged at equal intervals around the center of the injection hole 33, so that the electrolyte can be evenly diverted to the surrounding areas with the injection hole 33 as the center.

[0115] Exemplarily, the liquid injection groove 34 can be set as a straight groove structure, or the liquid injection groove 34 can be set as a curved arc groove, or the liquid injection groove 34 can also be set as a broken line groove with multiple bending portions. This is not limited here. In this application, the liquid injection groove 34 is taken as an example of a straight groove structure for explanation.

[0116] When the injection groove 34 is a straight groove, one end of the injection groove 34 is connected to the injection hole 33, and the other end extends in a direction away from the injection hole 33. The cross-section of the injection groove 34 can be square, circular or other polygonal. In the embodiment of the present application, the cross-section of the injection groove 34 is square as an example for explanation.

[0117] When the cross-section of the injection groove 34 is square, the cross-sectional area of ​​the injection groove 34 may be equal or gradually increase or decrease along the extension direction of the injection groove 34 . In the embodiment of the present application, the cross-sectional area of ​​the injection groove 34 is equal along the extension direction of the injection groove 34 .

[0118] For example, combined Figure 10 As shown, the injection groove 34 is opened from the end face of the frame 31 facing away from the pole 14 toward the pole 14. At this time, the thickness between the end face of the frame 31 facing the pole 14 and the end face of the frame 31 facing away from the pole 14 is denoted as H2, and the depth between the bottom wall of the injection groove 34 (the end near the pole 14) and the end face of the frame 31 facing away from the pole 14 is denoted as H3, where H3 = 1 / 20 to 3 / 4 H2. By defining the relationship between the depth of the injection groove 34 and the thickness of the frame 31, the overall strength of the frame 31 can be guaranteed while ensuring the flow diversion effect of the injection groove 34. If the thickness H3 of the injection groove 34 is less than 1 / 20 H2, the thickness is too small, which is not conducive to flow diversion and the flow diversion effect is poor. If the thickness of the injection groove 34 is greater than 3 / 4 H2, the thickness of the frame 31 at the location where the injection groove 34 is provided is smaller, resulting in reduced strength of the frame 31.

[0119] Figure 11 shows a partial structural diagram of the pole 14 provided in some embodiments of the present application, Figure 12 A partial cross-sectional view of a pole 14 provided in some embodiments of the present application is shown.

[0120] See also Figure 5 、 Figure 8 、 Figure 11 and Figure 12As shown, in some embodiments, the column 140 includes at least a first column 141 and a second column 142 connected together. The first column 141 and the second column 142 can be set as two independent structures. The two can be processed and formed separately, and then the first column 141 and the second column 142 are welded together by welding technology, or the first column 141 and the second column 142 are integrally formed by stamping technology. In the embodiment of the present application, there is no limitation on how the first column 141 and the second column 142 are connected. It is set according to actual needs. For example, when the pole 14 is used as a positive pole 14, the first column 141 and the second column 142 can be integrally formed. When the pole 14 is used as a negative pole 14, the first column 141 and the second column 142 can be manufactured separately and then connected together by welding.

[0121] It should be noted that the first column 141 is used to connect to the housing 10 , and the second column 142 is located inside the housing 10 and is used to connect to the battery cell tab 22 .

[0122] In the embodiment of the present application, the first column 141 is annularly arranged and is annularly arranged on the end surface of the second column 142 facing away from the frame body 31. The space between the first column 141 and the second column 142 forms a top groove 145, and the guide hole 1422 passes through the second column 142 and is connected to the top groove 145.

[0123] By configuring the first column 141 in an annular shape and surrounding the first and second columns 141, 142 with a top groove 145, the interior of the entire terminal 14 is made hollow. This reduces the material used for the terminal 14, lowering the manufacturing cost of the terminal 14 and also helping to reduce the weight of the terminal 14. Furthermore, the guide hole 1422 is connected to the top groove 145. When electrolyte is input into the guide hole 1422, the top groove 145 serves as a buffer and guide space for the electrolyte, preventing the electrolyte from splashing out of the guide hole 1422 when it is injected into the guide hole 1422. It also allows a certain amount of electrolyte to be buffered in the top groove 145, allowing the battery cell to have more electrolyte.

[0124] In some embodiments, the sealing cover 144 is connected to one end of the first column 141 away from the second column 142.

[0125] An abutment groove 1413 is provided on one end of the first column 141 away from the second column 142 and on the side facing the top groove 145. The abutment groove 1413 is connected to the top groove 145. The shape and size of the top groove 145 are adapted to the outer size of the sealing cover 144. The sealing cover 144 can overlap the abutment groove 1413, and the sealing cover 144 can be fixed to the first column 141 by welding. In this way, the top groove 145 can be sealed by the sealing cover 144, and the guide hole 1422 and the injection hole are indirectly isolated from the outside world, which is beneficial to prevent leakage of the electrolyte.

[0126] Exemplarily, the sealing cover 144 is stamped from a metal material and is electrically connected to the first column 141. By making the sealing cover 144 from a metal material and electrically connecting the sealing cover 144 to the first column 141, the electrical connection area of ​​the first column 141 is increased, thereby enabling the two battery cells to be electrically connected together through the first column 141 and the sealing cover 144.

[0127] In some embodiments, an abutment surface 1411 and a peripheral surface 1412 are provided at one end of the first column 141 away from the second column 142, and the abutment surface 1411 and the peripheral surface 1412 are both arranged around the top groove 145, wherein the peripheral surface 1412 and the inner wall of the first column 141 are spaced apart, and the peripheral surface 1412 roughly starts from the end surface of the first column 141 facing away from the second column 142 and extends toward the second column 142. One end of the abutting surface 1411 is connected to the peripheral surface 1412, and the other end of the abutting surface 1411 extends to the top groove 145. This end of the abutting surface 1411 is connected to the inner wall of the first column 141. There is a predetermined angle between the abutting surface 1411 and the peripheral surface 1412, so that an abutting groove 1413 can be formed between the abutting surface 1411 and the peripheral surface 1412. The abutting groove 1413 is an annular groove surrounding the top groove 145. The end of the abutting groove 1413 close to the top groove 145 is connected to the top groove 145. The abutting groove 1413 is open, and the opening direction is back to the second column 142, so that the sealing cover 144 can be overlapped on the abutting groove 1413.

[0128] It should be noted that the abutment surface 1411 is parallel to or has a predetermined angle with the top surface of the first cylinder 141 (the end surface of the first cylinder 141 facing away from the second cylinder 142). When the abutment surface 1411 and the top surface of the first cylinder 141 have a predetermined angle, the angle is less than 90°, and the predetermined angle between the peripheral surface 1412 and the abutment surface 1411 is set to be greater than or equal to 90°.

[0129] In the embodiment of the present application, the abutment surface 1411 is arranged parallel to the top surface of the first column 141. In this case, the peripheral surface 1412 can be arranged perpendicularly or inclined relative to the abutment surface 1411. When the peripheral surface 1412 is arranged perpendicularly relative to the abutment surface 1411, the end surface of the sealing cover 144 that is in contact with the peripheral surface 1412 and the end surface that is in contact with the abutment surface 1411 are also arranged perpendicularly.

[0130] When the peripheral surface 1412 is tilted relative to the abutting surface 1411, the peripheral surface 1412 is tilted away from the top groove 145, so that the end of the abutting groove 1413 away from the second column 142 is larger than the end of the abutting groove 1413 close to the second column 142, and the outer dimensions of the sealing cover 144 are adapted to the outer dimensions of the abutting groove 1413, so that the sealing cover 144 has two opposite ends, one large and one small. When the sealing cover 144 is overlapped with the abutting groove 1413, it can start from the smaller end of the sealing cover 144 and extend from the larger end of the abutting groove 1413 into the abutting groove 1413. At this time, the peripheral surface 1412 forms a guide surface, so that the sealing cover 144 can be quickly overlapped with the abutting groove 1413. In addition, by setting the peripheral surface 1412 as a slope, the area of ​​the peripheral surface 1412 can be increased, thereby increasing the fitting area and connection area between the peripheral surface 1412 and the sealing cover 144, which is beneficial to increasing the connection strength between the sealing cover 144 and the first column 141.

[0131] See also Figure 5 、 Figure 10 and Figure 12 As shown, in some embodiments, the frame 31 of the stop frame 30 is located between the battery cell body 21 and the terminal 14. To ensure that the frame 31 is not easily moved between the terminal 14 and the battery cell body 21, a limiting structure can be provided between the terminal 14 and the frame 31. For example, a clearance groove 143 can be provided on one of the stop frame 30 and the terminal 14, and a protrusion 35 can be provided on the other. The protrusion 35 is inserted and adapted to fit within the clearance groove 143. In this case, the peripheral wall of the protrusion 35 abuts against the side wall of the clearance groove 143, thereby limiting the horizontal movement of the frame 31 within the housing 10. It should be noted that horizontal movement refers to a direction parallel to the top or bottom end surface of the frame 31.

[0132] In some embodiments, the clearance groove 143 is provided on the pole 14, and the protrusion 35 is provided on the frame 31. Specifically, the clearance groove 143 is provided on the end surface of the second column 142 of the pole 14 facing the stop frame 30, and the clearance groove 143 is opened away from the stop frame 30. The end surface of the stop frame 30 facing the pole 14 is provided with a protrusion 35 protruding toward the pole 14.

[0133] It should be noted that, in one example, when a lead-out hole 32 is also provided on the frame 31, the position of the lead-out hole 32 can be staggered with the clearance groove 143 and the protrusion 35, that is, there is no overlapping part between the lead-out hole 32 and the clearance groove 143. At this time, the battery cell tab 22 is clamped between the bottom end of the second column 142 and the top end of the frame 31, and the protrusion 35 is inserted into the clearance groove 143.

[0134] See also Figure 7 As shown, in another example, when a lead-out hole 32 is provided on the frame 31, part of the lead-out hole 32 passes through the protrusion 35, so that the lead-out hole 32 and the protrusion 35 overlap, and when the protrusion 35 is inserted into the clearance groove 143, part of the lead-out hole 32 and the clearance groove 143 also overlap. At this time, the overlapping area of ​​the lead-out hole 32 and the clearance groove 143 can be set to be greater than or equal to the size of the end of the battery cell tab 22 extending out of the lead-out hole 32, so that the battery cell tab 22 can be set within the range of the clearance groove 143, and when the protrusion 35 is inserted into the clearance groove 143, the upper and lower ends of the battery cell tab 22 can be respectively attached to the bottom of the clearance groove 143 and the top of the protrusion 35. By arranging the cell tab 22 in the clearance groove 143, the clearance groove 143 can provide a clearance space, which can reduce the welding thickness between the cell tab 22 and the second column 142, thereby reducing the space occupied when the cell tab 22 and the second column 142 are welded, so that the overall space utilization rate in the shell 10 is higher.

[0135] It should be noted that when the protrusion 35 is inserted into the clearance groove 143, the side walls of the protrusion 35 and the side walls of the clearance groove 143 are arranged opposite each other. In order to prevent the protrusion 35 from moving horizontally relative to the second column 142, the side walls of the protrusion 35 and the side walls of the clearance groove 143 need to be completely or partially fitted together.

[0136] When the sidewall of the protrusion 35 and the inner wall of the clearance groove 143 partially fit together, there are at least multiple fitting locations, and the multiple fitting locations are spaced apart to ensure that the fitting locations can prevent the protrusion 35 from moving relative to the second column 142 in any direction parallel to its top or bottom surface. For example, there are three fitting locations between the sidewall of the protrusion 35 and the sidewall of the clearance groove 143, and the three fitting locations are evenly spaced around the circumference of the protrusion 35.

[0137] The shape of the protrusion 35 and the shape of the clearance groove 143 are not specifically limited. For example, the protrusion 35 can be round or square. If the protrusion 35 and the sidewalls of the clearance groove 143 do not completely fit together, the shape and size of the clearance groove 143 can be set to be similar to or different from the shape and size of the protrusion 35. In the embodiment of the present application, the shape and size of the protrusion 35 and the clearance groove 143 are adapted to each other as an example for description.

[0138] In some embodiments, the peripheral wall of the protrusion 35 may be arranged in a straight line in the direction of the opening of the clearance groove 143 . In this case, the side wall of the clearance groove 143 is arranged corresponding to the peripheral wall of the protrusion 35 .

[0139] In other embodiments, the peripheral wall of the protrusion 35 can also be configured as an inward-concave arc surface, while the inner sidewall of the clearance groove 143 can be configured as an outward-convex arc surface structure. It should be noted that inward-concave means that the sidewall of the protrusion 35 faces away from the sidewall of the clearance groove 143, while outward-convex means that the sidewall of the clearance groove 143 faces toward the protrusion 35. This can increase the contact area between the protrusion 35 and the clearance groove 143, thereby enhancing the stability between the two.

[0140] Of course, the peripheral wall of the protrusion 35 can also be set as an outward convex arc surface structure, and the inner side wall of the clearance groove 143 can be set as an inward concave arc surface structure. The setting is based on actual needs and is not limited here.

[0141] Combine Figure 10 As shown, in some embodiments, the distance between the end surface of the protrusion 35 on the frame 31 facing away from the frame 31 and the end surface of the frame 31 facing the second column 142 is the height of the protrusion 35, which is defined as H1. The height of the protrusion 35 satisfies H1 ≥ 0.2 mm. When the height of the protrusion 35 meets this size, it is conducive to its cooperation with the yield groove 143 to achieve a stopping effect. When the height of the protrusion 35 is less than 0.2 mm, the stopping effect is poor, which makes it easy for the frame 31 and the second column 142 to undergo relative displacement.

[0142] Combine Figure 12 As shown, in some embodiments, when a clearance groove 143 is defined in the second column 142, the thickness of the second column 142 at the location for welding to the cell tab 22 is the distance between the end surface of the second pole 14 facing away from the stop frame 30 and the end surface of the second column 142 facing the stop frame 30, where the end surface of the second pole 142 facing the stop frame 30 is the bottom surface of the clearance groove 143. When manufacturing the pole 14, the thickness of the second column 142 is denoted as H4, where H4 = 0.1-0.5 mm. When the thickness of the second pole 14 after the clearance groove 143 is defined is between 0.1-0.5 mm, its structural strength is ensured and the cell tab 22 can be prevented from being welded through during penetration welding between the second column 142 and the second column 142, thereby ensuring a good welding yield.

[0143] Combine Figure 2 、 Figure 4 、 Figure 10 and Figure 12As shown, in some embodiments, the end of the frame 31 of the stopper 30 facing the second column 142 is secured by the mating of the protrusion 35 and the clearance groove 143, while the end of the frame 31 facing away from the second column 142 abuts against the insulating film 23. A diaphragm 24 is disposed within the cell body 12. When the stopper 30 is installed in the housing 10 for securing, the stopper 30 compresses and squeezes the diaphragm 24 within the cell body 21, utilizing the diaphragm 24 for securing the cell body 21. When the stopper 30 and the diaphragm 24 are engaged for securing the cell body 21, the total thickness H (H = H1 + H2) of the stopper 30 and the dimensions of the diaphragm 24 have the following relationship: H = H5 - H6 - H7 - H8 * (20% to 90%) - H9 (5% to 70%). Among them, H5 represents the effective space between the pole 14 and the bottom of the shell 10, which is the space from the bottom of the groove 143 of the second column 142 to the bottom wall of the second shell 12; H6 represents the height of the structure arranged on the bottom wall of the second shell 12. For example, in this application, a bottom partition frame 13 is provided at the bottom of the second shell 12. At this time, H6 is the height of the bottom partition frame 13. In addition, in some other embodiments, the bottom of the second shell 12 may also be provided with an insulating film or tape and other structures. At this time, H6 is the total height of these structures; H7 represents the actual size of the positive and negative electrode material areas inside the battery body 21; H8 and H9 respectively represent the size of the upper part of the diaphragm 24 (the end close to the stop frame 30) exceeding the material area and the lower part of the diaphragm 24 (the end away from the stop frame 30) exceeding the material area.

[0144] It should be noted that the percentages of H8 and H9 in the above formula can be determined according to the weight change of the battery cell body 21. When the weight of the battery cell body 21 is relatively light, such as 100g, the coefficient of the upper thickness of the diaphragm 24 subtracted from the above formula can be 5%, and the coefficient of the lower thickness of the diaphragm 24 can be 20%. At this time, H1+H2=H5-H6-H7-H8*20%-H9*5%; when the thickness of the battery cell body 21 is relatively large, such as when the weight of the battery cell body 21 is 200-300g, the coefficient of the upper thickness of the diaphragm 24 is 70%, and the coefficient of the lower thickness of the diaphragm 24 is 90%. At this time, H1+H2=H5-H6-H7-H8*90%-H9*70%.

[0145] Figure 13 A schematic structural diagram of a sealing member 50 provided in some embodiments of the present application is shown.

[0146] See also Figure 5 and Figure 13 As shown, in some embodiments, the pole 14 is mounted on the housing 10 , a through-hole 111 is provided on the housing 10 , a portion of the structure of the pole 14 is passed through the through-hole 111 , and the portion of the pole 14 passed through the through-hole 111 is tightly fitted with the housing 10 .

[0147] Specifically, the shape of the through-hole 111 on the housing 10 is consistent with the outer shape of the first column 141, and the size of the through-hole 111 is larger than the size of the first column 141, so that the first column 141 can be inserted into the through-hole 111. A sealing member 50 is also provided between the housing 10 and the first column 141. The sealing member 50 is a rubber or plastic member and is arranged in an annular shape. At least a portion of the structure of the sealing member 50 is inserted into the through-hole 111. The peripheral wall of the structure of the sealing member 50 inserted into the through-hole 111 is completely in contact with the side wall of the through-hole 111, so that the portion of the sealing member 50 located in the through-hole 111 is sandwiched between the first column 141 and the wall of the through-hole 111.

[0148] It should be noted that the thickness of the sealing member 50 at the portion of the through-hole 111 is greater than the gap between the first column 141 and the wall of the through-hole 111. In this way, the sealing member 50 can be used to tightly fit the first column 141 and the wall of the through-hole 111, so that the first column 141 is fixed relative to the outer shell 10. By setting the sealing member 50, the first column 141 and the outer shell 10 can be sealed to prevent leakage of the electrolyte.

[0149] In some embodiments, the seal 50 includes a first sealing portion 51 and a second sealing portion 52 connected together, and the first sealing portion 51 and the second sealing portion 52 are integrally formed. The first sealing portion 51 is used to pass through the through-hole 111 so that the first sealing portion 51 is clamped between the hole wall of the through-hole 111 and the pole 14. At this time, the first sealing portion 51 is used to relatively fix the first column 141 and the shell 10.

[0150] The second sealing portion 52 is located within the housing 10. The end surface of the second sealing portion 52 facing away from the first sealing portion 51 abuts against the end surface of the second body facing away from the stop frame 30. Furthermore, the end surface of the second sealing portion 52 facing away from the second body abuts against the inner wall of the housing 10 facing the second post 142. This sandwiches the second sealing portion 52 between the inner wall of the housing 10 and the second post 142. By sandwiching the second sealing portion 52 between the inner wall of the housing 10 and the second post 142, the sealing area between the terminal 14 and the housing 10 is increased, enhancing the sealing effect. Furthermore, the second sealing portion 52, located between the second post 142 and the housing 10, acts as a buffer, preventing rigid contact between the housing 10 and the second post 142. Furthermore, by providing the sealing member 50 with a first sealing portion 51 and a second sealing portion 52, the first sealing portion 51 and the second sealing portion 52 are bent relative to each other, so that the first column 141 and the second column 142 of the pole 14 can be connected to the housing 10 respectively through the two sealing portions, thereby increasing the connection strength and making it difficult for the pole 14 to move relative to the housing 10.

[0151] Figure 14 FIG. 1 shows a schematic structural diagram of a connector 70 provided in some embodiments of the present application. Figure 15 Schematic diagram of the structure of the insulating member 60 provided in some embodiments of the present application is shown. Figure 16 A cross-sectional view of an insulating member 60 provided in some embodiments of the present application is shown.

[0152] See also Figure 5 and Figure 14 As shown, in some embodiments, multiple battery cells can be connected in series or in parallel. When multiple battery cells are electrically connected, they can be connected through the pole 14 or the aforementioned sealing cover 144. In the embodiment of the present application, in order to increase the connection area between two battery cells, a connector 70 can also be provided on the pole 14. The connector 70 is made of a metal material.

[0153] Specifically, the connecting member 70 is arranged on the first column 141, and an annular groove 1414 is provided on the peripheral wall of the first column 141 away from the stop frame 30 and facing away from the sealing cover 144. A protruding edge 71 is provided on one end face of the connecting member 70, and the protruding edge 71 can be inserted into the annular groove 1414 to connect the connecting member 70 to the first column 141.

[0154] It should be noted that the connecting member 70 can be a plurality of independent structures spaced apart around the outer peripheral wall of the first column 141. In this case, the protrusion 71 of the connecting member 70 can be interference fit with the annular groove 1414 to make the connection between the connecting member 70 and the first column 141 more stable.

[0155] In an embodiment of the present application, the connecting member 70 is arranged in a ring shape, and the ring-shaped connecting member 70 is arranged around the outer wall of the first column 141. The protrusion 71 on the connecting member 70 can be set as multiple independent structures at intervals, or can also be set as an annular structure arranged around the peripheral wall of the connecting member 70. In this way, the protrusion 71 can be inserted into the annular groove 1414 of the first column 141 to realize the connection between the connecting member 70 and the first column 141.

[0156] Combine Figure 15 and Figure 16As shown, in some embodiments, an insulating member 60 is further included between the connector 70 and the housing 10. The insulating member 60 includes at least a first insulating portion 61, a second insulating portion 62, and an edge portion 63. The first insulating portion 61 and the edge portion 63 are connected to both ends of the second insulating portion 62, and the first insulating portion 61 and the edge portion 63 are located on opposite sides of the second insulating portion 62. The first insulating portion 61 surrounds the outer wall of the first column 141 and is disposed outside the first column 141. The first insulating portion 61 is sandwiched between the first column 141 and the wall of the through-hole 111. The second insulating portion 62 is sandwiched between the connector 70 and the housing 10. The edge portion 63 is disposed around the circumferential wall of the connector 70 facing away from the first column 141, enclosing the connector 70. By providing the first insulating portion 61 and the second insulating portion 62, not only can the connector 70 be insulated so that the connector 70 does not contact any other structures except for direct contact with the first column 141, but the first insulating portion 61 is provided between the first column 141 and the outer shell 10, which can also increase the sealing between the first column 141 and the outer shell 10, which is beneficial to prevent the electrolyte from flowing out from between the first column 141 and the outer shell 10.

[0157] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0158] In the description of the present invention, it should be understood that the terms "including" and "having" and any variations thereof used in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or are inherent to these processes, methods, products or apparatus.

[0159] Unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "fixed," etc. should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances. Furthermore, the terms "first," "second," etc., etc., are used for descriptive purposes only and should not be construed to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated.

[0160] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery cell, characterized in that: include: A housing, comprising a shell and a pole connected to the shell; A battery cell assembly is disposed in the housing, the battery cell assembly comprising a battery cell body and a battery cell tab extending from the battery cell body; as well as A stop frame is arranged in the shell, the stop frame is located between the battery body and the pole, a gap is provided between the pole and the stop frame, and the battery tab is clamped between the stop frame and the pole.

2. The battery cell according to claim 1, wherein: The size of the gap between the pole and the stop frame is equal to the thickness of the battery cell tab.

3. The battery cell according to claim 1, wherein: The stop frame includes a frame body, the frame body is connected to the battery cell body, a lead-out hole is passed through the frame body, and the battery cell tab is passed through the lead-out hole.

4. The battery cell according to claim 3, characterized in that The frame is in the shape of a flat plate, and is a combination of one or more shapes including square, circular, and oval.

5. The battery cell according to claim 3, characterized in that: The lead-out hole is arranged opposite to the connection position between the battery cell tab and the battery cell body.

6. The battery cell according to claim 4, characterized in that The dimension of the lead-out hole in the cross-sectional width direction is greater than or equal to the thickness of the battery cell tab.

7. The battery cell according to claim 3, characterized in that A plurality of cell tabs are led out of the cell body, and the stop frame is provided with a lead-out hole. The plurality of cell tabs are converged and passed through the lead-out hole.

8. The battery cell according to claim 3, characterized in that The battery cell assembly has a plurality of battery cell tabs, and the stop frame is provided with a plurality of spaced lead-out holes, each of which is used for passing at least one battery cell tab.

9. The battery cell according to claim 3, characterized in that: The stop frame is also provided with a through injection hole. The pole includes a column and a sealing cover. The column has a guide hole passing through the position corresponding to the injection hole. The sealing cover is provided on the column and is used to seal the guide hole.

10. The battery cell according to claim 9, characterized in that A liquid injection groove is further provided on the end surface of the stop frame facing away from the pole, one end of the liquid injection groove is connected to the liquid injection hole, and the other end of the liquid injection groove extends to the edge of the stop frame.

11. The battery cell according to claim 10, characterized in that The stop frame is provided with a plurality of liquid injection grooves, one end of the plurality of liquid injection grooves converges at the liquid injection hole, and diverges toward the surrounding areas with the liquid injection hole as the center.

12. The battery cell according to claim 9, characterized in that The end surface of the pole facing the stop frame is provided with a guide portion protruding toward the stop frame, the guide portion is penetrated by the liquid injection hole, and the guide hole is provided through the guide portion.

13. The battery cell according to claim 9, characterized in that The column includes at least a first column and a second column, the first column is arranged around the second column, the first column and the second column are surrounded to form a top groove, the guide hole passes through the second column, and the guide hole is connected to the top groove.

14. The battery cell according to claim 13, characterized in that An abutting groove is provided at one end of the first column away from the second column. The abutting groove is communicated with the top groove, and the sealing cover overlaps the abutting groove.

15. The battery cell according to claim 14, characterized in that An abutment surface and a peripheral surface are provided at one end of the first column away from the second column. Both the abutment surface and the peripheral surface are arranged around the top groove. One end of the abutment surface is connected to the peripheral surface, and the other end extends to the top groove. There is a predetermined angle between the abutment surface and the peripheral surface to surround and form the abutment groove.

16. The battery cell according to claim 15, characterized in that The abutting surface is parallel to or has a predetermined angle with the top surface of the first column, and the predetermined angle between the peripheral surface and the abutting surface is greater than or equal to 90°.

17. The battery cell according to any one of claims 1 to 16, characterized in that: Any one of the stop frame and the pole is provided with a clearance groove, and the other is provided with a protrusion, the protrusion is plugged into the clearance groove, and the side wall of the protrusion is completely or partially fitted with the side wall of the clearance groove.

18. The battery cell according to claim 17, characterized in that The end face of the pole facing the stop frame is provided with the give way groove, facing away from the stop frame; the end face of the stop frame facing the pole is provided with the protrusion toward the pole; part of the lead-out hole passes through the protrusion; the battery cell tab located between the stop frame and the pole is located within the range of the give way groove.

19. The battery cell according to claim 17, characterized in that When the protrusion is inserted into the clearance groove, the peripheral wall of the protrusion fits with the inner wall of the clearance groove; The peripheral wall of the protrusion is an inward-concave arc surface, and the inner side wall of the clearance groove is an outward-convex arc surface structure; Alternatively, the peripheral wall of the protrusion is an outwardly convex arc surface structure, and the inner side wall of the clearance groove is an inwardly concave arc surface structure.

20. The battery cell according to any one of claims 1 to 16, characterized in that: The shell is provided with a through hole, the pole is passed through the through hole, and the portion where the pole is passed through the through hole is tightly fitted with the shell.

21. The battery cell according to claim 20, characterized in that The invention also includes a sealing member, which is arranged in an annular shape. At least a part of the structure of the sealing member passes through the through hole, and the sealing member is located at the through hole and is sandwiched between the pole and the hole wall of the through hole.

22. The battery cell according to claim 21, characterized in that The seal includes a first sealing portion and a second sealing portion connected together, the first sealing portion is arranged through the through hole and is clamped between the hole wall of the through hole and the pole, and the second sealing portion is located in the shell and is clamped between the inner wall of the shell and the structure of the pole located in the shell.

23. The battery cell according to claim 20, characterized in that An annular groove is formed on the peripheral wall of the pole away from the stop frame. A connecting piece is also formed around the end of the pole away from the stop frame. The connecting piece is provided with a convex edge at a position corresponding to the annular groove, and the convex edge is inserted into the annular groove.

24. The battery cell according to claim 23, characterized in that It also includes an insulating member, which includes a first insulating portion, a second insulating portion and an edge portion. The first insulating portion is clamped between the pole and the hole wall of the perforation, the second insulating portion is clamped between the connecting member and the shell, and the edge portion is arranged on the peripheral wall of the connecting member facing away from the pole.

25. The battery cell according to claim 1, characterized in that It also includes a top spacer, which is located between the outer shell and the battery cell body. The top spacer includes a base and a top plate. The top plate is penetrated by a through hole, and the pole is inserted into the through hole. The stop frame is located in the space enclosed between the base and the top plate.

26. The battery cell according to claim 1, characterized in that The battery cell assembly also includes a diaphragm, which is located in the battery cell body. The thickness of the stop frame is set to H, H=H5-H6-H7-H8*(20%~90%)-H9(5%-70%), wherein H5 represents the effective space between the pole and the bottom of the shell, H6 represents the height of the structure set at the bottom of the shell, and H7 represents the size of the positive and negative electrode material areas in the battery cell body; H8 and H9 respectively represent the size of the upper part of the diaphragm exceeding the material area and the size of the lower part of the diaphragm exceeding the material area.

27. A battery pack, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 26.

28. An electrical device, characterized in that: The invention comprises an electric device, a battery cell according to any one of claims 1 to 26, or a battery pack according to claim 27, wherein the battery pack is used to provide electric energy to the electric device.

Images