Battery cell, method for manufacturing battery cell, battery, and electric device using battery

Abstract

The application discloses a battery monomer, a preparation method of the battery monomer, a battery and an electric device using the battery, and relates to the technical field of batteries. The battery monomer comprises a shell, a pole and an electrode assembly. The pole is arranged on the first wall and is formed with a connecting hole penetrating through the pole. At least part of the inner peripheral wall of the connecting hole is formed into a first inclined surface. The first inclined surface is arranged to be inclined relative to the axis of the connecting hole. The electrode assembly comprises an active material coating part and a tab. The active material coating part is arranged in the shell. The tab is electrically connected with the active material coating part. At least part of the tab extends into the connecting hole and is connected with the first inclined surface. According to the battery monomer, at least part of the tab extends into the connecting hole and is fixedly connected with the first inclined surface by arranging the connecting hole penetrating through the pole on the pole and forming at least part of the inner peripheral wall of the connecting hole into the first inclined surface. Therefore, the tab occupies less space in the battery monomer, the weight of the tab and the pole is reduced, and the energy density of the battery monomer can be improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery cell, a method for preparing the battery cell, a battery, and an electrical device thereof. Background Technology

[0002] With increasingly severe environmental problems, growing public awareness of environmental protection, and rising oil prices, more and more people are focusing on new energy vehicles when purchasing vehicles. The range and power performance of these vehicles significantly influence consumer choices. Currently, most new energy vehicles use power batteries as energy storage and power sources, and they are also found in other types of vehicles. The energy density of the power battery has a significant impact on the vehicle's range and power performance; therefore, improving battery energy density is a continuous research focus in the ongoing improvement and innovation of batteries.

[0003] Currently, batteries have relatively long tab structures for connection and assembly with battery terminals. The long tabs result in some redundancy, which causes them to occupy a large space in the battery, thus reducing the battery's energy density. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a battery cell that can significantly improve the energy density of the battery cell.

[0005] The present invention also proposes a method for preparing the above-mentioned battery cell.

[0006] The present invention also proposes a battery having the above-mentioned battery cells.

[0007] The present invention also proposes an electrical device having the above-mentioned battery.

[0008] According to a first aspect of the present invention, a battery cell includes: a housing including a first wall; an electrode post disposed on the first wall and having a connecting hole through the electrode post, wherein at least a portion of the inner peripheral wall of the connecting hole is formed as a first inclined surface, the first inclined surface being arranged obliquely relative to the axis of the connecting hole; and an electrode assembly including an active material coating portion and an electrode tab, the active material coating portion being disposed within the housing, the electrode tab being electrically connected to the active material coating portion, and at least a portion of the electrode tab extending into the connecting hole and connected to the first inclined surface.

[0009] According to the battery cell of the present invention, by providing a through-hole on the terminal post and forming at least a first inclined surface on the inner wall of the through-hole, and by inserting at least a portion of the tab into the through-hole and fixing it to the first inclined surface, the tab can occupy less space in the battery cell, reduce the weight of the tab and the terminal post, and thus the energy density of the battery cell can be greatly improved.

[0010] In some embodiments of the present invention, the tab is welded to the pole post.

[0011] In this embodiment, the tab and the pole are connected and fixed by welding. The connection is firm and reliable. When connecting and fixing, the welding connection has a small operating space and a reliable and fast connection effect, making the connection and fixing of the tab and the pole more convenient and efficient.

[0012] In some embodiments of the invention, the first bevel extends radially outward along the connection hole in the direction from the electrode assembly toward the pole post.

[0013] In this embodiment, the first inclined surface is configured to extend radially outward along the connection hole. In this way, the first inclined surface can face the end of the connection hole away from the electrode assembly. Therefore, when the tab is fixedly connected to the first inclined surface, the external device can easily extend into the connection hole from the side of the pole facing away from the battery cell to contact the tab and operate the tab, thereby making the connection and fixation of the tab and the pole easier and more convenient.

[0014] In some embodiments of the present invention, the angle between the first inclined surface and the first plane perpendicular to the axis of the connecting hole is 0°-70°; or the angle between the first inclined surface and the first plane is 30°-60°.

[0015] In this embodiment, the angle between the first inclined surface and the first plane perpendicular to the axis of the connecting hole is limited to between 0° and 70°, which can better meet the needs of welding equipment, fixtures, etc. for welding and fixing the electrode lug and the electrode post, so that the electrode lug and the electrode post can obtain a good and stable welding and fixing effect. Further limiting the angle between the first inclined surface and the first plane can make the angle between the first inclined surface and the first plane within a more suitable angle range, so that after the electrode lug is inserted into the connecting hole, it can be more convenient and quick to abut against the first inclined surface. Welding equipment, fixtures, etc. can be more conveniently and smoothly arranged in the welding position in the connecting hole to perform welding operations on the electrode lug and the first inclined surface.

[0016] In some embodiments of the present invention, the pole post includes: a pole post body, the pole post body being a hollow annular shape, a raised connecting protrusion on the inner wall surface of the pole post body, the pole post body cooperating with the connecting protrusion to define the connecting hole, and the first inclined surface being formed on the connecting protrusion.

[0017] In this embodiment, the electrode body and the connecting protrusion cooperate to define the connecting hole. The first inclined surface is formed on the connecting protrusion. The electrode tab can be directly and conveniently attached to the first inclined surface and connected and fixed to the first inclined surface. The connecting protrusion can play a good role in structurally strengthening the electrode body, making the overall structural strength of the electrode higher. The first inclined surface is formed on the connecting protrusion, and the connecting protrusion can well withstand the force when the electrode tab is connected and fixed to the first inclined surface, so that the electrode tab and the first inclined surface can be welded and fixed more stably.

[0018] In one embodiment of the invention, in the axial direction of the connecting hole, at least a portion of the side surface of the connecting protrusion facing away from the electrode assembly is formed as the first inclined surface.

[0019] In this embodiment, the first inclined surface is set on the side of the connecting protrusion away from the electrode assembly. This allows the connecting protrusion to form a certain separation between the tab and the electrode assembly at the connecting hole, reducing the impact on the electrode assembly when the tab and the first inclined surface are welded together. This makes the electrode assembly more stable during assembly. The connecting protrusion can also provide a certain sealing effect on the terminal post, making the battery cell more stable.

[0020] In some examples of the present invention, the first inclined surface has a welding area, the electrode lug is welded to the welding area, the thickness of the connecting protrusion at the welding area position in the axial direction of the connecting hole is a first thickness, the depth of the molten pool formed at the welding area position of the connecting protrusion when the electrode lug is welded to the connecting protrusion is a first depth, and the first thickness is greater than the first depth.

[0021] In this embodiment, the first thickness is set to be greater than the first depth, which can prevent the connecting protrusion from being welded through when the tab is welded to the first inclined surface. This allows the connecting protrusion to maintain good structural strength and a stable connection with the tab, reducing the possibility of welding slag and other debris falling into the electrode assembly after the connecting protrusion is welded through. It also reduces the possibility of the high temperature during welding being transferred to the electrode assembly and causing damage. As a result, the tab and the terminal post can be welded more reliably and stably, and the battery cell can maintain good quality.

[0022] In one example of the present invention, the difference between the first thickness and the first depth is greater than or equal to 0.2 mm.

[0023] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm. This allows the welding equipment to reliably weld the tab to the first inclined surface when the connecting bump is welded to the electrode tab, and reliably reduces the possibility of the connecting bump being welded through, thereby making the battery cell more stable during assembly.

[0024] In some specific embodiments of the present invention, the difference between the first thickness and the first depth is greater than or equal to 0.5 mm.

[0025] In this embodiment, the difference between the first thickness and the first depth is further limited, which can better reduce the possibility of the welding equipment burning through the connecting protrusion when welding the tab and the first inclined surface, so that the battery cell can be structurally more stable and reliable during assembly and welding.

[0026] In some examples of the invention, the first bevel is connected to the arcuate side surface of the connecting protrusion facing the electrode assembly.

[0027] In this embodiment, the first inclined surface is connected to the side of the connecting protrusion facing the electrode assembly by an arc. This makes the transition between the first inclined surface and the side of the connecting protrusion facing the motor assembly smoother, thereby reducing the possibility of damage to the electrode when it is fixed to the first inclined surface. In addition, the position of the arc connection provides some clearance for the electrode to bend towards the first inclined surface, so that the electrode can be more stably and reliably attached to the first inclined surface, thus resulting in a better welding effect when the electrode is welded to the first inclined surface.

[0028] In one embodiment of the present invention, the side surface of the connecting protrusion facing the electrode assembly is flush with the side surface of the electrode post body facing the electrode assembly.

[0029] In this embodiment, the side surface of the connecting protrusion facing the electrode assembly is flush with the side surface of the electrode post body facing the electrode assembly. This allows the connecting protrusion to be completely within the space enclosed by the inner wall of the electrode post body, thereby reducing the additional space occupied by the connecting protrusion in the battery cell. This can, to some extent, help improve the energy density of the battery cell. Furthermore, the side surface of the electrode post facing the electrode assembly only has an opening structure for the connecting hole, allowing the tab to be positioned more freely and stably at the opening of the connecting hole and to extend into the connecting hole to cooperate and fix with the first inclined surface. This makes the tab and the electrode post easier to assemble.

[0030] In one embodiment of the present invention, the minimum width of the connecting hole is greater than or equal to 3 mm.

[0031] In this embodiment, the minimum width of the connecting hole is set to be greater than or equal to 3mm, which allows the electrode tab to be conveniently and reliably inserted into the connecting hole from the opening and fixed to the first inclined surface, making the connection and fixation of the electrode tab and the electrode post more convenient and easier.

[0032] In one embodiment of the present invention, the ratio of the minimum width of the connecting hole to the thickness of the electrode tab is 1.5-5; or, the ratio of the minimum width of the connecting hole to the thickness of the electrode tab is 2.5-5.

[0033] In this embodiment, the ratio of the minimum width of the connecting hole to the thickness of the tab is limited to 1.5-5, which allows the connecting hole to have a larger minimum width to facilitate the insertion of the tab. It is understood that the connecting hole is formed by the inner wall of the pole body and the first inclined surface of the connecting protrusion. Limiting the ratio of the minimum width of the connecting hole to the thickness of the tab to 1.5-2 ensures that the first inclined surface on the connecting protrusion has sufficient length for welding and fixing with the tab, thus ensuring a good fit between the tab and the first inclined surface when welding the tab to the pole. Further limiting the ratio of the minimum width of the connecting hole to the thickness of the tab to 2.5-5 further reduces the possibility of the connecting hole wall causing abrasion damage to the tab when it is inserted, allowing the tab to be inserted into the connecting hole more conveniently and reliably from the opening position of the minimum width of the connecting hole and fixed with the first inclined surface.

[0034] In one embodiment of the present invention, the ratio of the minimum width of the connecting hole to the maximum width of the connecting hole is 0.3-0.5; or, the ratio of the minimum width of the connecting hole to the maximum width of the connecting hole is 0.35-0.45.

[0035] In this embodiment, the ratio of the minimum width to the maximum width of the connecting hole is limited, which makes the design and manufacturing of the terminal post more convenient. In this embodiment, the ratio of the minimum width to the maximum width of the connecting hole is limited to 0.3-0.5, which allows the tab to be inserted into the connecting hole from the opening at the minimum width of the connecting hole and connected and fixed to the first inclined surface. This allows the first inclined surface formed by the connecting protrusion in the connecting hole to better meet the needs of connection and fixation with the tab while maintaining or reducing the original height of the terminal post. The opening at the minimum width has a smaller opening structure, which can maintain a weak connection between the connecting hole and the housing cavity and the external environment to a certain extent, so that the terminal post can play a certain sealing effect on the battery cell. This embodiment further limits the ratio of the minimum width to the maximum width of the connecting hole, which makes it easier for the tab to be inserted into the connecting hole, and allows the first inclined surface to cooperate with the tab for connection and fixation more well and reliably. This improves and reduces the overall height of the terminal post, thereby helping to increase the energy density of the battery cell.

[0036] In one embodiment of the present invention, the electrode post further includes: a first ring, the first ring being connected to one end of the electrode post body facing the electrode assembly, the first ring extending radially outward along the electrode post body and extending circumferentially along the electrode post body to form an annular shape; and a second ring, the second ring being connected to the other end of the electrode post body away from the electrode assembly, the second ring extending radially outward along the electrode post body and extending circumferentially along the electrode post body to form an annular shape.

[0037] In this embodiment, a first ring and a second ring are respectively provided at both ends of the electrode post body. The first ring and the second ring can improve the structural strength of the electrode post body to a certain extent, making the overall structural strength of the electrode post better. This makes the connection and fixation of the electrode post and the electrode tab more stable and reliable, and the electrode post can better participate in the power transmission operation of the battery cell. The first ring and the second ring can cooperate with the electrode post body to form a slot structure, which facilitates the installation and fixation of the electrode post in the battery cell. The first ring and the second ring have a simple structure and are easy to use.

[0038] In some embodiments of the present invention, the battery cell further includes a mating block disposed within the connection hole, and the tab abuts between the mating block and the first inclined surface.

[0039] In this embodiment, a mating block is provided inside the connection hole to clamp the tab against the first inclined surface. This allows the tab to be stably abutted and fixed against the first inclined surface under the action of the mating block, maintaining a good abutment state, thus facilitating the welding of the tab to the terminal post. The mating block inside the connection hole further strengthens the terminal post. Simultaneously, the mating block provides some shielding to the end of the connection hole facing the electrode assembly, thereby achieving a certain sealing effect on the terminal post and reducing the possibility of electrolyte leakage at the terminal post connection hole, resulting in good stability for the battery cell.

[0040] In one embodiment of the present invention, the mating block has a second inclined surface parallel to the first inclined surface, and the electrode abuts between the first inclined surface and the second inclined surface.

[0041] A second inclined plane parallel to the first inclined plane is provided on the mating block, so that the distance between the first inclined plane and the second inclined plane in the extension direction perpendicular to the first inclined plane can always be the same. Therefore, when welding and fixing the electrode tab and the electrode post, under the cooperation and pressing action of the second inclined plane and the first inclined plane, the part of the electrode tab falling on the first inclined plane can always remain close to and fixed to the first inclined plane in the extension direction of the first inclined plane, making the welding of the electrode tab to the first inclined plane more convenient and stable. The mating block can use the cooperation of the second inclined plane and the first inclined plane to stably and reliably press and fix the electrode tab.

[0042] In some examples of the present invention, in the axial direction of the connecting hole, the end face of the mating block facing the electrode assembly abuts against the electrode assembly.

[0043] In this embodiment, the mating block abuts against the electrode assembly, which can limit and fix the electrode assembly and the tab in the axial direction of the electrode post, and also exert a certain pressure on the tab, so that one end of the tab can be more stably inserted into the connection hole, and the electrode assembly can be more securely placed in the battery cell after assembly.

[0044] In one example of the present invention, the mating block is welded to the pole post.

[0045] In this embodiment, the mating block and the pole are fixed by welding, which is convenient and reliable. The mating block can stably and reliably cooperate with the connecting protrusion to clamp and fix the pole tab, thus making the connection and fixation of the pole tab and the pole post more stable and convenient.

[0046] In some examples of the present invention, a support protrusion is formed on the peripheral wall of the connecting hole, the support protrusion and the first inclined surface are arranged at intervals in the circumferential direction of the connecting hole, and one end of the mating block is supported on the support protrusion.

[0047] In this embodiment, a support protrusion is provided in the connection hole to support and fix the mating block. When the mating block is assembled with the pole post, the support protrusion can provide good support and limit the mating block, reducing the possibility of the mating block being pressed excessively downward toward the first inclined surface. This allows the mating block and the first inclined surface to better cooperate and clamp the pole tab. The support protrusion can further improve the structural strength of the pole post to a certain extent, making the structural stability of the pole post better.

[0048] In one example of the present invention, the angle between the first inclined surface and the second inclined surface and the first plane perpendicular to the axis of the connecting hole is 0°-60°.

[0049] In this embodiment, the angle between the first inclined plane and the second inclined plane and the first plane perpendicular to the axis of the connecting hole is limited to between 0° and 60°. This makes the angle between the first inclined plane and the first plane, and the angle between the second inclined plane and the first plane, acute angles within a small range. As a result, the inclination of the first inclined plane and the second inclined plane in the radial direction of the connecting hole is relatively gentle. When welding the tab and the pole, since the welding direction of the welding equipment is perpendicular to the extension direction of the first inclined plane and the second inclined plane, the welding equipment can also be inserted into the connecting hole at a smaller angle to perform the welding operation. This better reduces the interference of the hole wall of the connecting hole on the welding equipment, fixtures, etc., making it more convenient and easier to weld and fix the tab and the pole.

[0050] In some specific embodiments of the present invention, the angle between the first inclined plane and the second inclined plane and the first plane is 0°-20°.

[0051] In this embodiment, the angle between the first inclined surface and the second inclined surface and the first plane is further limited to between 0° and 20°, so that the first inclined surface and the second inclined surface can extend radially along the connecting hole more gently, and the first inclined surface and the second inclined surface can better face each other on the side of the connecting hole away from the electrode assembly. This makes it easier, more convenient and faster for welding equipment, fixtures, etc. to extend into and reach the welding position of the first inclined surface and the second inclined surface, making the welding and fixing of the electrode tab and the electrode post more convenient and efficient.

[0052] In one example of the invention, the other end of the mating block extends to the opposite sidewall of the connecting hole, opposite to the support protrusion.

[0053] In this embodiment, by extending the other end of the mating block to the sidewall opposite the support protrusion of the connecting hole, the mating block and the support protrusion can effectively seal the connecting hole. This allows the end of the first inclined electrode tab extending into the connecting hole to be relatively tightly sealed between the first and second inclined surfaces. This significantly reduces the probability of the electrode tab and the welded joint of the first inclined surface coming into contact with the external atmosphere through the connecting hole, making the electrical connection between the electrode tab and the electrode post more stable and reliable. The mating block and the sidewall of the connecting hole can form a good abutment and fixation effect, allowing the mating block to better reinforce the structure of the electrode post, making the overall structure of the electrode post more stable and robust.

[0054] In some specific embodiments of the present invention, the mating block, the electrode lug, and the electrode post are welded together as a single unit.

[0055] In this embodiment, the mating block is welded to the electrode lug and electrode post as a whole, making the connection and fixation of the mating block to the electrode lug and electrode post more secure and reliable, and the mating block and electrode post can be more firmly fixed to the electrode lug.

[0056] In one embodiment of the present invention, the material of the mating block is the same as the material of the pole post.

[0057] In this embodiment, the material of the mating block is set to be the same as that of the pole post, which makes it easier to weld and fix the mating block and the pole post, resulting in a stronger weld and a better welding effect.

[0058] In some embodiments of the present invention, the active material coating portion includes a current collector and an active material layer disposed on the current collector. The tab is electrically connected to the current collector. The tab includes a plurality of tab pieces. The plurality of tab pieces converge near the current collector to form a first gathering portion. The plurality of tab pieces converge and connect away from the current collector to form a second gathering portion. The first gathering portion connects the second gathering portion and the active material coating portion. At least a portion of the second gathering portion extends into the connecting hole and is connected to the first inclined surface.

[0059] In this embodiment, multiple tabs are brought together to form a tab, which makes it easier to reliably connect and fix the tabs and the pole during welding and fixing through the second gathering part. The second gathering part can also have a smaller size and thickness, making it easier and more convenient for the tab to be inserted into the connection hole and fit and fix with the first inclined surface.

[0060] In one embodiment of the invention, at least a portion of the first gathering portion extends into the connecting hole and extends along the first inclined surface.

[0061] In this embodiment, at least a portion of the first gathering part extends into the connection hole and along the first inclined surface, which allows the tab and the first inclined surface to have a longer contact and fixing dimension, thereby making the connection and fixing of the tab and the first inclined surface more stable and reliable. The space occupied by the tab in the housing can be reduced, thereby increasing the size of the active material coating part to improve the energy density of the battery cell. Furthermore, it can further reduce the redundancy of the tab in the housing, further reducing the probability of short circuit between the tab and the active material coating part, thus making the battery cell more stable and reliable in use.

[0062] In one embodiment of the present invention, the ratio of the overlap width of the second gathering portion on the first inclined surface to the width of the first inclined surface is greater than or equal to 0.5.

[0063] In this embodiment, the width of the overlap between the second gathering part and the first inclined surface on the first inclined surface is limited to greater than or equal to 0.5. This allows the second gathering part and the first inclined surface to have sufficient overlap length so that the second gathering part can be stably and firmly connected to the first inclined surface, thereby making the connection between the electrode tab and the electrode post stable and reliable.

[0064] In some examples of the present invention, the ratio of the overlap width of the second gathering portion and the first inclined surface to the width of the first inclined surface is 0.8-1.2.

[0065] This embodiment further limits the ratio of the overlap width between the second gathering part and the first inclined surface to the width of the first inclined surface, so that the second gathering part and the first inclined surface can overlap and cooperate better. The second gathering part can maintain a large overlap surface and overlap length with the first inclined surface, making the connection and fixation between the tab and the terminal more stable and reliable. It can also reduce the redundant size of the first inclined surface or the second gathering part, making it easier for the second gathering part and the first inclined surface to cooperate and abut. This can reduce the space occupied by the tab and the terminal in the battery cell to a certain extent.

[0066] In some embodiments of the present invention, the battery cell further includes a cover plate, the cover plate covering one end of the connection hole opposite to the electrode assembly, the cover plate being sealed to the electrode post.

[0067] In this embodiment, a cover plate is provided to seal the terminal post, which can reliably seal the mating block and the tab structure located in the connection hole. This ensures that the tab and the terminal post are in a good closed environment after welding and fixing, thus making the connection between the tab and the terminal post stable and good during long-term use. The cover plate can cooperate with the terminal post to transmit electricity, and the cover plate can form a good electrical connection surface, making it easier for the battery cell to be connected to the electrical connector during use.

[0068] In one embodiment of the present invention, a groove is formed on the side surface of the pole facing away from the electrode assembly, the connecting hole is formed inside the groove and penetrates the bottom wall of the groove, and the cover plate is disposed in the groove.

[0069] In this embodiment, a groove is provided on the pole post, which makes it easier to position the cover plate and the pole post when fixing them, and makes the connection and fixation more stable and reliable.

[0070] In some examples of the invention, the sidewalls of the groove extend radially outward along the connection hole in the direction from the electrode assembly toward the cover plate.

[0071] In this embodiment, the sidewall of the groove extends outward along the radial direction of the connecting hole, which can play a certain guiding role when assembling the cover plate and the pole, so that the cover plate can be fixed in the groove more easily. The structure is simple and easy to assemble. When welding the cover plate and the pole, the welding quality can be high, and the welding sealing effect between the cover plate and the pole can be good.

[0072] In some examples of the present invention, the side surface of the cover plate facing away from the electrode assembly is flush with the end face of the pole facing away from the electrode assembly.

[0073] In this embodiment, the side surface of the cover plate away from the electrode assembly is flush with the end face of the pole away from the electrode assembly. This allows the cover plate and the pole to form a continuous plane, thereby reducing the space occupied by the cover plate and increasing the electrical connection surface of the battery cell pole. This can improve the energy density of the battery cell and make it easier for the battery cell to be electrically connected to the electrical connector through the end of the pole away from the electrode assembly.

[0074] According to a method for preparing a battery cell according to a second aspect of the present invention, wherein the battery cell is a battery cell according to a first aspect of the present invention, the method includes: inserting one end of a tab into a connecting hole of a terminal post; causing one side surface of the one end of the tab in the thickness direction to abut against a first inclined surface; and welding the one end of the tab to the first inclined surface.

[0075] According to the battery cell preparation method of the present invention, by inserting the tab into the connection hole of the terminal post and abutting against and welding it to the first inclined surface, the tab can occupy less space in the battery cell, reduce the weight of the tab and the terminal post, and thus greatly improve the energy density of the battery cell.

[0076] In some embodiments of the present invention, the step of abutting one side surface of the electrode tab in the thickness direction with the first inclined surface includes: inserting a mating block into the connecting hole, and pressing one end of the electrode tab against the first inclined surface until it abuts against the first inclined surface through the mating block.

[0077] In this embodiment, the mating block presses one end of the electrode tab against the first inclined surface, which allows the electrode tab to stably and reliably fit and abut against the first inclined surface under the action of the mating block. The mating block can reduce the degree of insertion of the mechanical device used to drive the movement of the mating block into the connection hole, thereby making it easier and more convenient for the electrode tab to abut and fix against the first inclined surface.

[0078] The battery according to a third aspect of the present invention includes a battery cell according to a first aspect of the present invention.

[0079] According to the battery of the present invention, by providing the battery cell of the first aspect described above, a connecting hole penetrating the terminal post is provided on the terminal post and at least a portion of the inner wall of the connecting hole is formed as a first inclined surface, and at least a portion of the tab extends into the connecting hole and is fixedly connected to the first inclined surface, the tab can occupy less space in the battery cell, reduce the weight of the tab and the terminal post, thereby greatly improving the energy density of the battery cell.

[0080] An electrical device according to a fourth aspect of the invention includes a battery according to a third aspect of the invention, said battery being used to provide electrical energy.

[0081] According to the electrical device of the present invention, by providing the battery of the third aspect described above, a connecting hole penetrating the terminal post is provided on the terminal post and at least a portion of the inner wall of the connecting hole is formed as a first inclined surface, and at least a portion of the tab extends into the connecting hole and is fixedly connected to the first inclined surface, the tab can occupy less space in the battery cell, reduce the weight of the tab and the terminal post, thereby greatly improving the energy density of the battery cell.

[0082] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0083] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of the present invention;

[0084] Figure 2 yes Figure 1An exploded view of the battery shown;

[0085] Figure 3 yes Figure 2 A cross-sectional view of the battery cell shown;

[0086] Figure 4 yes Figure 3 A schematic diagram of the electrode assembly shown;

[0087] Figure 5 yes Figure 3 A schematic diagram of the pole shown;

[0088] Figure 6 yes Figure 3 A schematic diagram of the mating block shown;

[0089] Figure 7 yes Figure 3 The diagram shows the electrode assembly assembled with the housing and electrode post.

[0090] Figure 8 yes Figure 3 The diagram shows the assembly of the mating block with the housing, pole piece and electrode assembly.

[0091] Figure 9 This is a cross-sectional view of a battery cell according to another embodiment of the present invention;

[0092] Figure 10 yes Figure 9 A schematic diagram of the mating block shown;

[0093] Figure 11 yes Figure 9 The diagram shown illustrates the assembly of the housing with the pole and electrode assembly.

[0094] Figure 12 yes Figure 9 The diagram shows the assembly of the mating block with the housing, pole piece and electrode assembly.

[0095] Figure 13 This is a schematic diagram of a battery cell according to an embodiment of the present invention.

[0096] Figure label:

[0097] 10. Battery cells;

[0098] 11. Shell; 111. First wall; 112. Receiving cavity;

[0099] 12. Pole post; 121. First ring; 122. Pole post body; 1221. Connecting protrusion; 12211. First inclined surface; 1222. Supporting protrusion; 1223. Connecting hole; 1224. Groove; 123. Second ring;

[0100] 13. Electrode assembly; 131. Active material coating part; 132. Tab; 1321. First gathering part; 1322. Second gathering part;

[0101] 14. Mating block; 141. Second inclined plane;

[0102] 15. Cover plate;

[0103] 20. Box; 201. First box; 202. Second box;

[0104] 100. Battery; 200. Controller; 300. Motor;

[0105] 1000. Electrical appliances. Detailed Implementation

[0106] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0107] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the invention, are intended to cover non-exclusive inclusion.

[0108] In the description of the embodiments of this invention, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this invention, "multiple" means two or more, unless otherwise explicitly defined.

[0109] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0110] In the description of the embodiments of the present invention, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0111] In the description of the embodiments of the present invention, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "bottom", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0112] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0113] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As a core component of new energy vehicles, power batteries have high requirements in terms of both energy density and reliability.

[0114] During the manufacturing process of a battery cell, the tabs inside the casing need to be connected to the terminals. The tabs consist of multiple tabs extending from the electrode plates inside the battery cell. Typically, an adapter plate is placed inside the battery cell and welded to the multiple tabs, and then the adapter plate is welded to the terminal. Alternatively, there is a connection method where multiple tabs are ultrasonically pre-welded before being welded to the adapter plate. To meet process requirements, the tabs need to be extended to a certain extent and have a certain degree of redundancy to ensure reliable and stable connection between the tabs, the adapter plate, and the terminal. The extended tabs occupy a large space when arranged inside the battery cell, thereby reducing the energy density of the battery cell and resulting in a lower energy density. At the same time, the adapter plate further reduces the energy density of the battery cell. The extended tabs are prone to short-circuiting with the electrode plates, causing internal short circuits in the battery and resulting in poor stability of the battery cell.

[0115] In a battery cell, the connection between the tab and the terminal can also be achieved by pre-welding the tab and then laser welding the terminal. Specifically, the tab is pre-welded and then directly connected to the terminal by laser welding. This eliminates the need for an adapter plate and can significantly improve the energy density of the battery cell. However, the tab still needs to be relatively long and have a certain degree of redundancy to ensure a reliable and stable connection between the tab and the terminal. The tab occupies a large space within the battery cell, resulting in a lower energy density for the battery cell.

[0116] Based on the above considerations, in order to reduce the space occupied by the tabs and improve the energy density of the battery cell, the present invention provides a battery cell with a connection hole in the terminal post and a first inclined surface in the connection hole, and the tabs are fixedly connected to the first inclined surface, so that the tabs occupy a small space in the battery cell, thereby greatly improving the energy density of the battery cell.

[0117] In this invention, the battery cell 100 may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and this embodiment of the invention is not limited to these. The battery cell 100 may be cylindrical, flat, cuboid, or other shapes, etc., and this embodiment of the invention is not limited to these. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and this embodiment of the invention is not limited to these.

[0118] In the embodiments of this invention, the battery 100 refers to a single physical module comprising one or more battery cells 10 to provide higher voltage and capacity. For example, the battery 100 mentioned in this invention can be a battery module or a battery 100 pack, etc. A battery module generally includes multiple battery cells 10. A battery 100 pack generally includes a housing 20 for encapsulating one or more battery cells 10 or one or more battery modules. The housing 20 can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 10.

[0119] The battery cell 10 disclosed in this embodiment of the invention can be used in an electrical device 1000 that uses the battery 100 as a power source or in various energy storage systems that use the battery 100 as an energy storage element. The electrical device 1000 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0120] For ease of explanation, the following embodiments use a vehicle as an example of an electrical device 1000 according to an embodiment of the present invention.

[0121] refer to Figure 1 As shown, Figure 1 This is a schematic diagram of an electrical device 1000 according to an embodiment of the present invention. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle, and the battery 100 can be located at the bottom, front, or rear of the vehicle. The battery 100 can be used to power the vehicle; for example, the battery 100 can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle during starting, navigation, and driving.

[0122] In some embodiments of the present invention, the battery 100 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0123] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery cell 10 used in a battery 100 according to some embodiments of the present invention. The battery 100 includes a housing 20 and a plurality of battery cells 10, with the battery cells 10 housed within the housing 20. The housing 20 provides assembly space for the battery cells 10, and the housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which overlap each other, and together define an assembly space for accommodating the battery cells 10. The second housing 202 may be a hollow structure open at one end, and the first housing 201 may be a plate-like structure, with the first housing 201 covering the open side of the second housing 202 so that the first housing 201 and the second housing 202 together define the assembly space; alternatively, the first housing 201 and the second housing 202 may both be hollow structures open on one side (e.g., ...). Figure 2 As shown, the open side of the first box 201 is closed to the open side of the second box 202. Of course, the box 20 formed by the first box 201 and the second box 202 can be of various shapes, such as a cylinder or a cuboid.

[0124] In battery 100, multiple battery cells 10 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 10 are connected in both series and parallel configurations. Multiple battery cells 10 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 10 is housed within housing 20. Alternatively, battery 100 can also be composed of multiple battery cells 10 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within housing 20. Battery 100 may also include other structures, such as busbars and electrical connectors, for achieving electrical connections between the multiple battery cells 10.

[0125] The following is for reference. Figures 3-11 A battery cell 10 according to an embodiment of the first aspect of the present invention is described. Figure 3 yes Figure 2 A cross-sectional view of the battery cell 10 shown; Figure 4 yes Figure 3 A schematic diagram of the electrode assembly 13 shown; Figure 5 yes Figure 3 A schematic diagram of the pole post 12 shown; Figure 6 yes Figure 3 A schematic diagram of the mating block 14 shown; Figure 7 yes Figure 3 A schematic diagram of the electrode assembly 13 assembled with the housing 11 and the electrode post 12 shown; Figure 8 yes Figure 3 A schematic diagram showing the assembly of the mating block 14 with the housing 11, the pole post 12 and the electrode assembly 13; Figure 9 This is a cross-sectional view of a battery cell 10 according to another embodiment of the present invention; Figure 10 yes Figure 9 A schematic diagram of the mating block 14 shown; Figure 11 yes Figure 9 The diagram shows the housing 11 assembled with the pole post 12 and the electrode assembly 13. Figure 12 yes Figure 9 A schematic diagram showing the assembly of the mating block 14 with the housing 11, the pole post 12 and the electrode assembly 13; Figure 13 This is a schematic diagram of a battery cell 10 according to an embodiment of the present invention.

[0126] like Figures 3-13As shown, a battery cell 10 according to a first aspect embodiment of the present invention includes: a housing 11, a terminal post 12, and an electrode assembly 13. Specifically, the housing 11 includes a first wall 111; the terminal post 12 is disposed on the first wall 111 and has a connecting hole 1223 through the terminal post 12, at least a portion of the inner peripheral wall of the connecting hole 1223 is formed as a first inclined surface 12211, the first inclined surface 12211 is arranged obliquely relative to the axis of the connecting hole 1223; the electrode assembly 13 includes an active material coating portion 131 and a tab 132, the active material coating portion 131 is disposed in the housing 11, the tab 132 is electrically connected to the active material coating portion 131, and at least a portion of the tab 132 extends into the connecting hole 1223 and is connected to the first inclined surface 12211.

[0127] The shape of the casing 11 can be adjusted according to the type of battery cell 10. For example, when the battery cell 10 is a square battery 100, the casing 11 is square; when the battery cell 10 is a cylindrical battery 100, the casing 11 is cylindrical. In the embodiments of the present invention, a square casing 11 is used as an example for explanation. (Reference) Figure 3 As shown, the housing 11 can be an aluminum housing, a stainless steel housing, etc. The housing 11 is used to house the electrode assembly 13 in the battery cell 10 and to fix the terminal post 12. The first wall 111 of the housing 11 is formed in the length direction of the housing 11 (e.g., Figure 3 At one end (shown in the up-down direction), during the assembly of the battery cell 10, the electrode assembly 13 can be placed into the receiving cavity 112 of the housing 11, and the electrode post 12 is fixed to the first wall 111 of the housing 11. Specifically, the first wall 111 of the housing 11 may be provided along the thickness direction of the first wall 111 (e.g., in the up-down direction). Figure 3 The mounting hole (shown in the up-down direction) passes through the first wall 111. The pole post 12 is set in the mounting hole and fixedly connected to the housing 11. For example, the pole post 12 and the housing 11 can be welded or riveted to fix them.

[0128] The terminal 12 is used to connect the battery cell 10 to the electrical connector and transmit electrical energy. The material of the terminal 12 can be copper, aluminum, zinc, or their alloys, etc. The shape of the terminal 12 can be set to a circular, rectangular, or other shapes according to design requirements. Generally, there are at least two terminals 12. Specifically, there is at least one positive terminal and at least one negative terminal. For example, when there are two terminals 12, one is a positive terminal and the other is a negative terminal, and they are electrically connected to the positive and negative tabs 132 of the electrode assembly 13, respectively. As another example, when there are four terminals 12, two can be positive terminals and two can be negative terminals. In this case, both positive terminals are electrically connected to the positive tab of the cell assembly, and both negative terminals are electrically connected to the negative tab of the cell assembly.

[0129] Electrode assembly 13 is typically formed by stacking or winding electrode sheets and separators. The electrode sheets include positive electrode sheets and negative electrode sheets. The positive electrode tabs led out from the positive electrode sheets are electrically connected to the positive electrode post, and the negative electrode tabs led out from the negative electrode sheets are electrically connected to the negative electrode post.

[0130] A positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer can be directly or indirectly coated on the positive current collector to form the positive active material coating part of the electrode assembly 13. The part of the positive current collector that is not coated with the positive active material layer protrudes from the positive active material coating part to form a positive electrode tab. Multiple positive electrode tabs are stacked together to form a positive electrode tab. The positive electrode tab is led out from the positive electrode and electrically connected to the positive active material coating part. The materials of the positive current collector and the positive active material coating part are set according to the type of battery cell 10. For example, when the battery 100 is a lithium-ion battery, the material of the positive current collector can be aluminum, and the material of the positive active material coating part can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0131] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer can be directly or indirectly coated on the negative current collector to form the negative active material coating portion of the electrode assembly 13. The portion of the negative current collector without the negative active material layer protrudes from the negative active material coating portion to form a negative electrode tab. Multiple negative electrode tabs are stacked together to form a negative electrode tab, which is then led out from the negative electrode and electrically connected to the negative active material coating portion. The materials of the negative current collector and the negative active material coating portion are set according to the type of the battery cell 10. For example, when the battery 100 is a lithium-ion battery, the material of the negative current collector can be copper, and the material of the negative active material coating portion can be carbon or silicon, etc. The material of the separator is not limited; for example, the separator can be a polypropylene film or a polyethylene film, etc.

[0132] For ease of description, the embodiments of the present invention will not distinguish between the positive and negative electrodes of the electrode post 12, electrode tab 132, and electrode plate, etc. The electrode post 12, electrode tab 132, and electrode plate, etc., and their related descriptions involved in the embodiments of the present invention can be applied to structures such as positive electrode tab, positive electrode post, and positive electrode plate, or to structures such as negative electrode tab, negative electrode post, and negative electrode plate, or to structures such as positive and negative electrode tab 132, positive and negative electrode post 12, and positive and negative electrode plate.

[0133] In this embodiment, at least a portion of the tab 132 extends into the connection hole 1223. That is, the tab 132 can extend partially into the connection hole 1223, or the tab 132 can extend completely into the connection hole 1223.

[0134] In this embodiment, a connecting hole 1223 is formed on the pole post 12, and the shape of the connecting hole 1223 can match the shape of the pole post 12. At least a portion of the inner peripheral wall of the connecting hole 1223 is formed as a first inclined surface 12211. That is, the inner peripheral wall of the connecting hole 1223 can be partially formed as a first inclined surface 12211, or the inner peripheral wall of the connecting hole 1223 can be completely formed as a first inclined surface 12211. Here, "completely" means that the first inclined surface 12211 can extend from one end to the other end in the axial direction of the connecting hole 1223. The inclination angle and size of the first inclined surface 12211 can be reasonably set as needed. When the electrode tab 132 is fixedly connected to the first inclined surface 12211, the electrode tab 132 extends into the connection hole 1223 of the electrode post 12 and is inclined towards the first inclined surface 12211, so that the electrode tab 132 can fit with the first inclined surface 12211. After the electrode tab 132 fits with the first inclined surface 12211, the electrode tab 132 and the first inclined surface 12211 can be connected by welding, riveting, bolting, etc.

[0135] In this embodiment, a housing 11 is provided. As an indispensable component of the battery cell 10, the housing 11 facilitates the assembly and fixation of the electrode assembly 13 and the terminal post 12 in the battery cell 10. The housing 11 can provide good protection and sealing for the electrode assembly 13, thereby enabling the battery cell 10 to maintain a stable structural and operational state during processing, transportation and use. The structure is simple and the performance is good.

[0136] In this embodiment, the electrode post 12 is provided with a through connection hole 1223, which can reduce the weight of the electrode post 12 and thus improve the energy density of the battery cell 10 to a certain extent. At least part of the tab 132 extends into the connection hole 1223 of the electrode post 12 and is connected and fixed to the electrode post 12. This allows the tab 132 and the electrode post 12 to partially overlap in the arrangement space within the battery cell 10, thereby greatly reducing the space occupied by the tab 132 within the battery cell 10 and significantly improving the energy density of the battery cell 10.

[0137] It is understandable that when the tab 132 is connected and fixed to the pole post 12, the tab 132 and the pole post 12 need to have sufficient connection and fixing surfaces. Specifically, the length of the connection between the tab 132 and the pole post 12 needs to meet certain requirements. In this embodiment, when at least a part of the tab 132 is inserted into the connection hole 1223 of the pole post 12 and connected and fixed to the pole post 12, the height of the pole post 12 needs to be adaptively adjusted according to the height of the tab 132 in the height direction of the pole post 12. Figure 3When the dimension (shown in the vertical direction) is long, the height of the terminal post 12 needs to be set higher, which will increase the weight and volume of the terminal post 12, thereby reducing the energy density of the battery cell 10. Here, the height dimension of the terminal post 12 refers to the length dimension of the terminal post 12 in the axial direction of the connection hole 1223.

[0138] In this embodiment, at least a portion of the inner wall of the connection hole 1223 of the pole post 12 is formed with a first inclined surface 12211. The first inclined surface 12211 is arranged at an angle relative to the axis of the connection hole 1223, which allows the first inclined surface 12211 to have a shorter length in the axial direction of the connection hole 1223 and a longer length in the inclined direction. When at least a portion of the pole lug 132 is inserted into the connection hole 1223 and fixedly connected to the first inclined surface 12211, the pole lug 132 can be fixed to the first inclined surface 12211 along the inclined direction of the first inclined surface 12211. This allows for a sufficient connection and fixing length with the first inclined surface 12211, enabling the tab 132 to be stably and reliably connected to the terminal post 12. The tab 132 has a smaller arrangement dimension in the axial direction of the connection hole 1223, allowing the height dimension of the terminal post 12 to be set according to conventional dimensions or shortened to a certain extent, thereby keeping the weight and volume of the terminal post 12 unchanged or reduced. Thus, by using the tab 132 to be fixedly connected to the first inclined surface 12211, the battery cell 10 can have a higher energy density.

[0139] Since the tab 132 extends into the connection hole 1223 and is fixed on the first inclined surface 12211, the tab 132 is more stable and convenient to be fixed and assembled with the terminal post 12, which can reduce the possibility of the tab 132 falling off. Moreover, the length of the tab 132 required for connection and fixing can be determined more easily during the manufacturing process of the tab 132, thereby reducing the length redundancy of the tab 132, reducing the weight and volume of the tab 132 to a certain extent, and further improving the energy density of the battery cell 10.

[0140] It is understood that the battery cell 10 has positive and negative electrode plates. In this embodiment, after the tab 132 is electrically connected to the first inclined surface 12211, it can have a better separation effect with the other polarity electrode plate in the housing 11, thereby reducing the probability of short circuit in the battery cell 10 and making the battery cell 10 more stable.

[0141] According to an embodiment of the present invention, the battery cell 10 has a through-hole 1223 on the terminal post 12, and at least a portion of the inner wall of the through-hole 1223 is formed as a first inclined surface 12211. At least a portion of the tab 132 extends into the through-hole 1223 and is fixedly connected to the first inclined surface 12211. This allows the tab 132 to occupy less space in the battery cell 10, reducing the weight of the tab 132 and the terminal post 12, thereby significantly improving the energy density of the battery cell 10.

[0142] In some embodiments of the present invention, the tab 132 may be welded to the pole post 12.

[0143] The tab 132 is welded to the pole post 12. For example, the tab 132 and the pole post 12 can be welded and fixed by welding methods such as ultrasonic welding, laser welding or resistance hot melt welding.

[0144] In this embodiment, the tab 132 and the pole post 12 are connected and fixed by welding. The connection is firm and reliable. When connecting and fixing, the welding connection has a small operating space and a reliable and fast connection effect, making the connection and fixing of the tab 132 and the pole post 12 more convenient and efficient.

[0145] In some embodiments of the present invention, such as Figures 3-5 As shown, in the direction from the electrode assembly 13 toward the electrode post 12, the first inclined surface 12211 can be radially (e.g., along the connection hole 1223) Figure 3 (As shown in the left and right directions) it tilts outwards and extends.

[0146] refer to Figure 3 and Figure 4 As shown, the direction of electrode assembly 13 toward electrode post 12 refers to the axial direction of connection hole 1223 (e.g., Figure 3 In the direction shown (up and down), from the side of the pole post 12 facing the inside of the battery cell 10 to the side facing the outside of the battery cell 10, in this embodiment, the first inclined surface 12211 extends radially outward along the connecting hole 1223. The tab 132 extends into the connecting hole 1223 from the side of the first inclined surface 12211 facing the electrode assembly 13 and extends radially outward along the first inclined surface 12211 towards the connecting hole 1223. In the actual assembly process, the tab 132 can first extend into the connecting hole 1223 along the axial direction of the connecting hole 1223, and then bend towards the first inclined surface 12211 to fit the first inclined surface 12211, thereby fixing it to the first inclined surface 12211.

[0147] In this embodiment, the first inclined surface 12211 is configured to extend radially outward along the connection hole 1223. In this way, the first inclined surface 12211 can face the end of the connection hole 1223 away from the electrode assembly 13. Therefore, when the tab 132 is fixedly connected to the first inclined surface 12211, the external device can easily extend from the side of the pole post 12 facing away from the battery cell 10 into the connection hole 1223 to contact the tab 132 and operate the tab 132, thereby making the connection and fixation of the tab 132 and the pole post 12 easier and more convenient.

[0148] In some embodiments of the present invention, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 can be 0°-70°.

[0149] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 70°. For example, the angle can be 10°, 20°, 30°, 40°, 50°, 60°, etc. (Reference) Figure 3 As shown in the figure, straight line L represents the axis of connecting hole 1223, straight line L1 represents the first plane, the first plane is set perpendicular to the axis, and the extension line L2 of the first inclined surface 12211 towards the first plane forms an angle α with the first plane L1.

[0150] It is understandable that when the tab 132 and the pole post 12 are welded and fixed, the welding position of the tab 132 and the pole post 12 is inside the connecting hole 1223 of the pole post 12. The hole wall of the connecting hole 1223 causes certain obstruction and interference to the arrangement and movement of welding equipment, fixtures, etc. In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 70°, which can better meet the needs of welding equipment, fixtures, etc. for welding and fixing the tab 132 and the pole post 12, so that the tab 132 and the pole post 12 can obtain a good and stable welding and fixing effect.

[0151] In one embodiment of the present invention, the angle between the first inclined plane 12211 and the first plane can be 30°-60°.

[0152] In this embodiment, the angle between the first inclined surface 12211 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 30° and 60°. For example, the angle can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, etc.

[0153] This embodiment further limits the included angle between the first inclined surface 12211 and the first plane, so that the included angle between the first inclined surface 12211 and the first plane is within a more suitable angle range. This allows the electrode tab 132 to be inserted into the connection hole 1223 and then more conveniently and quickly abut against the first inclined surface 12211. Welding equipment, fixtures, etc. can be more conveniently and smoothly arranged in the welding position within the connection hole 1223 to perform welding operations between the electrode tab 132 and the first inclined surface 12211.

[0154] In some embodiments of the present invention, such as Figure 5 As shown, the pole post 12 may include: a pole post body 122, which is a hollow ring. A protruding connecting protrusion 1221 is provided on the inner wall surface of the pole post body 122. The pole post body 122 and the connecting protrusion 1221 cooperate to define a connecting hole 1223. A first inclined surface 12211 is formed on the connecting protrusion 1221.

[0155] The pole body 122 is configured as a hollow ring. For example, the cross-section of the pole body 122 can be formed into a circular ring, an oval frame, a rectangular frame, or other ring structures. The connecting protrusion 1221 is disposed on the inner wall surface of the pole body 122. Specifically, the side of the connecting protrusion 1221 near the inner wall surface of the pole body 122 can be attached to and connected to the inner wall surface of the pole body 122. The connecting protrusion 1221 can be separately disposed from the pole body 122, or it can be formed as an integral structure with the pole body 122. The material of the connecting protrusion 1221 can be the same as or different from the material of the pole body 122.

[0156] In this embodiment, the pole post body 122 and the connecting protrusion 1221 cooperate to define the connecting hole 1223. The first inclined surface 12211 is formed on the connecting protrusion 1221. Specifically, refer to Figure 3 and Figure 4 As shown, the first inclined surface 12211 is located on the side of the connecting protrusion 1221 away from the electrode assembly 13 in the axial direction of the pole post 12. The first inclined surface 12211 can be formed as part of the hole wall of the connecting hole 1223. After the electrode tab 132 is inserted into the connecting hole 1223, the electrode tab 132 can be directly and conveniently attached to the first inclined surface 12211 and connected and fixed to the first inclined surface 12211.

[0157] In this embodiment, a protruding connecting protrusion 1221 is provided on the inner wall surface of the pole body 122. The connecting protrusion 1221 can play a good role in structural reinforcement of the pole body 122, making the overall structural strength of the pole 12 higher. The first inclined surface 12211 is formed on the connecting protrusion 1221. The connecting protrusion 1221 can withstand the force when the pole tab 132 is connected and fixed to the first inclined surface 12211, so that the pole tab 132 and the first inclined surface 12211 can be welded and fixed relatively stably.

[0158] In one embodiment of the present invention, such as Figure 4 As shown, in the axial direction of the connecting hole 1223 (e.g.) Figure 3 In the vertical direction shown, at least a portion of the side surface of the connecting protrusion 1221 facing away from the electrode assembly 13 can be formed as a first inclined surface 12211.

[0159] At least a portion of the side surface of the electrode assembly 13 away from the connecting protrusion 1221 is formed as a first inclined surface 12211. That is, the side surface of the electrode assembly 13 away from the connecting protrusion 1221 can be formed as a first inclined surface 12211, or a portion of the side surface of the electrode assembly 13 away from the connecting protrusion 1221 can be formed as a first inclined surface 12211. For example, a portion of the side surface of the electrode assembly 13 away from the connecting protrusion 1221 is formed as a first inclined surface and another portion is formed as a plane, curved surface, folded surface, etc.

[0160] In this embodiment, the first inclined surface 12211 is set on the side of the connecting protrusion 1221 away from the electrode assembly 13. This allows the connecting protrusion 1221 to form a certain separation between the tab 132 and the electrode assembly 13 at the connecting hole 1223. This reduces the impact and effect on the electrode assembly 13 when the tab 132 and the first inclined surface 12211 are welded together, thus making the electrode assembly 13 more stable during assembly. The connecting protrusion 1221 can also provide a certain sealing effect on the terminal post 12, making the battery cell 10 more stable.

[0161] In some examples of the present invention, references Figure 3 and Figure 4 As shown, the first inclined surface 12211 may have a welding area, and the electrode tab 132 is welded to the welding area. In the axial direction of the connecting hole 1223, the thickness of the connecting protrusion 1221 at the welding area position is the first thickness. When the electrode tab 132 and the connecting protrusion 1221 are welded, the depth of the molten pool formed at the welding area position of the connecting protrusion 1221 is the first depth, and the first thickness is greater than the first depth.

[0162] The welding zone refers to the area where the tab 132 is welded to the first inclined surface 12211. During welding, the welding equipment rapidly melts and solidifies the tab 132 and the first inclined surface 12211 in the welding zone, thus connecting and fixing them together. The thickness of the connecting protrusion 1221 in the welding zone refers to the thickness of the welding area of ​​the connecting protrusion 1221 in the axial direction of the connecting hole 1223. The molten pool depth refers to the distance between the deepest point of the molten portion of the base material and the surface of the base material. In this embodiment, the molten pool depth refers to the dimension of the welding area of ​​the connecting protrusion 1221 in the axial direction of the connecting hole 1223. Figure 3 As shown in the figure, h1 represents the first thickness and h2 represents the first depth.

[0163] In this embodiment, the first thickness is set to be greater than the first depth, which can prevent the connecting protrusion 1221 from being welded through when the tab 132 is welded to the first inclined surface 12211. This allows the connecting protrusion 1221 to maintain good structural strength and a stable connection with the tab 132, reducing the possibility of welding slag and other debris falling into the electrode assembly 13 after the connecting protrusion 1221 is welded through. It also reduces the possibility of the high temperature during welding being transferred to the electrode assembly 13 and causing damage to the electrode assembly 13. As a result, the tab 132 and the electrode post 12 can be welded more reliably and stably, and the battery cell 10 can maintain good quality.

[0164] In one example of the present invention, the difference between the first thickness and the first depth may be greater than or equal to 0.2 mm.

[0165] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.2 mm. For example, the difference between the first thickness and the first depth can be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0166] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm. This allows the welding equipment to stably and reliably weld the tab 132 to the first inclined surface 12211 when the connecting protrusion 1221 is welded and fixed to the electrode 132, and reliably reduces the possibility of the connecting protrusion 1221 being welded through, thereby making the battery cell 10 more stable during assembly.

[0167] In some specific embodiments of the present invention, the difference between the first thickness and the first depth can be greater than or equal to 0.5 mm.

[0168] In this embodiment, the difference between the first thickness and the first depth is set to be greater than or equal to 0.5 mm. For example, the difference between the first thickness and the first depth can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, etc.

[0169] In this embodiment, the difference between the first thickness and the first depth is further limited, which can better reduce the possibility of the welding equipment welding through the connecting protrusion 1221 when welding the tab 132 and the first inclined surface 12211, so that the battery cell 10 can be structurally more stable and reliable during assembly and welding.

[0170] In some examples of the present invention, such as Figure 4 As shown, the first inclined surface 12211 and the side surface of the connecting protrusion 1221 facing the electrode assembly 13 can be connected by an arc.

[0171] Specifically, refer to Figure 3 and Figure 4 As shown, the side of the first inclined surface 12211 facing the electrode assembly 13 can be connected to the arc of the side surface of the connecting protrusion 1221 facing the electrode assembly 13. The arc can be a semi-circular arc, a quarter-circular arc, etc., and the radius of the arc can be reasonably set according to the welding connection requirements between the tab 132 and the first inclined surface 12211. When the tab 132 is fixed with the first inclined surface 12211, the part of the tab 132 located on the side of the pole post 12 facing the electrode assembly 13 and the part of the tab 132 extending into the connecting hole 1223 clamp the connecting protrusion 1221. The side of the tab 132 facing the first inclined surface 12211 and the side of the tab 132 facing the connecting protrusion 1221 form an angle. The part where the arc of the first inclined surface 12211 and the side surface of the connecting protrusion 1221 facing the electrode assembly 13 is located at the angle formed by the tab 132.

[0172] In this embodiment, the first inclined surface 12211 is connected to the side surface of the connecting protrusion 1221 facing the electrode assembly 13 by an arc. This makes the transition between the first inclined surface 12211 and the side surface of the connecting protrusion 1221 facing the motor assembly smoother, thereby reducing the possibility of damage to the electrode 132 when it is fixed to the first inclined surface 12211. In addition, the position of the arc connection provides a certain amount of clearance for the electrode 132 to bend towards the first inclined surface 12211, so that the electrode 132 can be more stably and reliably attached to the first inclined surface 12211, thereby improving the welding effect when the electrode 132 is welded to the first inclined surface 12211.

[0173] In one embodiment of the present invention, such as Figure 4As shown, the side surface of the connecting protrusion 1221 facing the electrode assembly 13 can be flush with the side surface of the electrode post body 122 facing the electrode assembly 13.

[0174] like Figure 4 As shown, the side surface of the electrode body 122 facing the electrode assembly 13 has an opening of a connection hole 1223. The side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with the side surface of the electrode body 122 facing the electrode assembly 13 and cooperates with the side surface of the electrode body 122 facing the electrode assembly 13 to form the opening of the connection hole 1223. The distance between the side surface of the connecting protrusion 1221 facing the electrode assembly 13 and the electrode assembly 13 is the same as the distance between the side surface of the electrode body 122 facing the electrode assembly 13 and the electrode assembly 13. The tab 132 of the electrode assembly 13 extending from the side surface of the electrode body 122 facing the electrode body 122 extends into the connection hole 1223 from the opening of the connection hole 1223 and is fixed in place by cooperating with the first inclined surface 12211 of the connecting protrusion 1221.

[0175] In this embodiment, the side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with the side surface of the electrode post body 122 facing the electrode assembly 13. This allows the connecting protrusion 1221 to be completely within the space enclosed by the inner wall of the electrode post body 122, thereby reducing the additional space occupied by the connecting protrusion 1221 in the battery cell 10. This can, to some extent, help improve the energy density of the battery cell 10. Furthermore, the side surface of the electrode post 12 facing the electrode assembly 13 only has an opening structure for the connecting hole 1223. This allows the tab 132 to be positioned relatively freely and stably at the opening position of the connecting hole 1223 and to extend into the connecting hole 1223 from the opening to cooperate and fix with the first inclined surface 12211. This makes it more convenient to assemble the tab 132 and the electrode post 12.

[0176] In one embodiment of the present invention, the minimum width of the connecting hole 1223 may be greater than or equal to 3 mm.

[0177] The width of the connecting hole 1223 refers to its radial width on the pole post 12. Since the first inclined surface 12211 is formed as part of the inner wall of the connecting hole 1223, it extends radially outward from the side of the pole post body 122 facing the electrode assembly 13 towards the side of the pole post body 122 away from the electrode assembly 13. The width of the connecting hole 1223 gradually increases along its axial direction towards the side away from the electrode assembly 13. In other words, the width of the opening formed by the connecting hole 1223 on the side of the pole post body 122 facing the electrode assembly 13, where it mates with the connecting protrusion 1221, is the minimum width of the connecting hole 1223. When the tab 132 is welded to the pole post 12, the tab 132 needs to extend into the connecting hole 1223 from its minimum-width opening and mate with the first inclined surface 12211 for fixation. (Reference) Figure 4 As shown in the figure, L3 represents the minimum width of the connecting hole 1223. For example, the minimum width L3 of the connecting hole 1223 can be 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, etc.

[0178] In this embodiment, the minimum width of the connecting hole 1223 is set to be greater than or equal to 3mm, which allows the tab 132 to be conveniently and reliably inserted into the connecting hole 1223 from the opening of the connecting hole 1223 and fixed to the first inclined surface 12211, making it easier and more convenient to connect and fix the tab 132 to the pole post 12.

[0179] In one embodiment of the present invention, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 can be 1.5-5.

[0180] The thickness of tab 132 refers to the distance between the side surface of tab 132 that is in contact with the first inclined surface 12211 and the side surface of tab 132 that is away from the first inclined surface 12211. For example, the ratio of the minimum width of the connecting hole 1223 to the thickness of tab 132 can be 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.

[0181] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 is limited to 1.5-5, which allows the connecting hole 1223 to have a larger minimum width to facilitate the insertion of the tab 132. It is understood that the connecting hole 1223 is formed by the inner wall of the pole body 122 and the first inclined surface 12211 of the connecting protrusion 1221. Limiting the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 to 1.5-5 ensures that the first inclined surface 12211 on the connecting protrusion 1221 has sufficient length for welding and fixing with the tab 132, thus ensuring a good fit between the tab 132 and the first inclined surface 12211 when welding the tab 132 to the pole 12.

[0182] In some examples of the present invention, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 can be 2.5-5.

[0183] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 is limited to 2.5-5. For example, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 can be 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, 5, etc.

[0184] In this embodiment, the ratio of the minimum width of the connecting hole 1223 to the thickness of the tab 132 is further limited to between 2.5 and 5. This can better reduce the possibility of the wall of the connecting hole 1223 causing scratch damage to the tab 132 when it is inserted, and make it easier and more reliable for the tab 132 to be inserted into the connecting hole 1223 from the opening position of the minimum width of the connecting hole 1223 and to cooperate and fix with the first inclined surface 12211.

[0185] In one embodiment of the present invention, the ratio of the minimum width of the connecting hole 1223 to the maximum width of the connecting hole 1223 can be 0.3-0.5.

[0186] The maximum width of the connecting hole 1223 refers to the maximum radial width of the connecting hole 1223 on the pole post 12. (Refer to...) Figure 4 As shown in the figure, L4 represents the maximum width of the connection hole 1223. The maximum width of the connection hole 1223 can be formed on the side of the connection hole 1223 facing away from the electrode assembly 13. The ratio of the minimum width to the maximum width of the connection hole 1223 can be 0.3, 0.35, 0.4, 0.45, 0.5, etc., with a ratio less than or equal to 0.5. That is, the opening of the connection hole 1223 at the end facing the electrode assembly 13 is less than half the opening of the connection hole 1223 at the end facing away from the electrode assembly 13.

[0187] In this embodiment, the ratio of the minimum width of the connection hole 1223 to the maximum width of the connection hole 1223 is limited, which makes it easier to determine the overall width of the connection hole 1223 and manufacture it according to the width required for the opening of the connection hole 1223 facing the electrode assembly 13 during the processing and manufacturing process, making the design and manufacturing of the connection hole 12 more convenient.

[0188] In this embodiment, the ratio of the minimum width to the maximum width of the connection hole 1223 is limited to between 0.3 and 0.5. This allows the tab 132 to be conveniently and reliably inserted into the connection hole 1223 from the opening at the minimum width and connected and fixed to the first inclined surface 12211. This allows the first inclined surface 12211 formed by the connecting protrusion 1221 in the connection hole 1223 to better meet the need for connection and fixation with the tab 132 while maintaining or reducing the original height of the pole post 12. It also makes the opening at the minimum width have a smaller opening structure, thereby maintaining a relatively weak connection between the connection hole 1223 and the housing 11 cavity 112 and the external environment to a certain extent, so that the pole post 12 can provide a certain sealing effect for the battery cell 10.

[0189] In some examples of the present invention, the ratio of the minimum width of the connecting hole 1223 to the maximum width of the connecting hole 1223 can be 0.35-0.45.

[0190] For example, the ratio of the minimum width to the maximum width of the connecting hole 1223 can be 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, etc.

[0191] This embodiment further limits the ratio of the minimum width to the maximum width of the connection hole 1223, so that the connection hole 1223 can better facilitate the insertion of the tab 132, and the first inclined surface 12211 can more reliably cooperate with the tab 132 for connection and fixation, so that the overall height of the pole post 12 can be well improved and reduced, thereby helping to improve the energy density of the battery cell 10.

[0192] In one embodiment of the present invention, reference is made to... Figure 3 and Figure 4 As shown, the electrode post 12 may further include: a first ring 121 and a second ring 123. The first ring 121 is connected to one end of the electrode post body 122 facing the electrode assembly 13, and the first ring 121 extends radially outward along the electrode post body 122 and extends circumferentially along the electrode post body 122 to form a ring; the second ring 123 is connected to the other end of the electrode post body 122 away from the electrode assembly 13, and the second ring 123 extends radially outward along the electrode post body 122 and extends circumferentially along the electrode post body 122 to form a ring.

[0193] The surface of the first ring 121 facing the electrode assembly 13 can be flush with the surface of the electrode body 122 facing the electrode assembly 13. The shape of the first ring 121 can match the shape of the electrode body 122. The first ring 121 and the electrode body 122 can be separately set or integrally formed. The material of the first ring 121 can be the same as or different from the material of the electrode body 122. The thickness of the first ring 121 in the axial direction of the electrode body 122 can be reasonably set according to the installation and assembly requirements of the electrode 12. Optionally, the first ring 121 can be formed by flanges along the radial direction of the electrode body 122 from one end of the electrode body 122 facing the electrode assembly 13.

[0194] The surface of the second ring 123 facing the electrode assembly 13 can be flush with the surface of the electrode body 122 away from the electrode assembly 13. The shape of the second ring 123 can match the shape of the electrode body 122. The second ring 123 and the electrode body 122 can be separately set or integrally formed. The material of the second ring 123 can be the same as or different from the material of the electrode body 122. The thickness of the second ring 123 in the axial direction of the electrode body 122 can be reasonably set according to the installation and assembly requirements of the electrode 12. Optionally, the second ring 123 can be formed by flanged outward along the radial direction of the electrode body 122 from the end of the electrode body 122 away from the electrode assembly 13.

[0195] In this embodiment, a first ring 121 and a second ring 123 are respectively provided at both ends of the electrode post body 122. The first ring 121 and the second ring 123 can improve the structural strength of the electrode post body 122 to a certain extent, making the overall structural strength of the electrode post 12 better. This makes the connection and fixation of the electrode post 12 and the tab 132 more stable and reliable, and the electrode post 12 can better participate in the power transmission operation of the battery cell 10. The first ring 121 and the second ring 123 can cooperate with the electrode post body 122 to form a slot structure, which facilitates the installation and fixation of the electrode post 12 in the battery cell 10. The first ring 121 and the second ring 123 have a simple structure and are easy to use.

[0196] In some embodiments of the present invention, such as Figure 3 As shown, the battery cell 10 may further include: a mating block 14, which is disposed in the connection hole 1223, and the tab 132 abuts between the mating block 14 and the first inclined surface 12211.

[0197] The shape of the mating block 14 can match the connecting hole 1223 and the first inclined surface 12211. The mating block 14 can be made of the same material as the pole post 12. The mating block 14 can be fixedly connected to the pole post body 122, and the mating block 14 can also be fixedly connected to the pole post body 122 and the pole lug 132. When the pole lug 132 is welded to the pole post 12, the mating block 14 is inserted into the connecting hole 1223, and the side surface of the mating block 14 facing the first inclined surface 12211 engages with the first inclined surface 12211 to clamp and fix the pole lug 132.

[0198] In this embodiment, a mating block 14 is provided inside the connection hole 1223 to engage with the first inclined surface 12211 to clamp the tab 132. This allows the tab 132 to be stably abutted and fixed on the first inclined surface 12211 under the action of the mating block 14, maintaining a good abutment state. This makes it easier to weld the tab 132 to the terminal post 12. The mating block 14, located inside the connection hole 1223, further strengthens the structure of the terminal post 12. At the same time, the mating block 14 can partially shield the opening of the connection hole 1223 facing the electrode assembly 13, thereby providing a certain sealing effect for the terminal post 12. This reduces the possibility of electrolyte leakage at the connection hole 1223 of the battery cell 10, resulting in good stability for the battery cell 10.

[0199] In one embodiment of the present invention, such as Figure 3 and Figure 6 As shown, the mating block 14 has a second inclined surface 141 parallel to the first inclined surface 12211, and the tab 132 can abut between the first inclined surface 12211 and the second inclined surface 141.

[0200] The second inclined surface 141 can be a plane or a curved surface. Along the axial direction of the electrode post 12, one end of the second inclined surface 141 facing the electrode assembly 13 can be flush with one end of the first inclined surface 12211 facing the electrode assembly 13. The end of the second inclined surface 141 away from the electrode assembly 13 can be flush with one end of the first inclined surface 12211 away from the electrode assembly 13 or located within the extension range of the first inclined surface 12211. Optionally, in this embodiment, both the second inclined surface 141 and the first inclined surface 12211 are planes.

[0201] A second inclined surface 141 parallel to the first inclined surface 12211 is provided on the mating block 14, so that the distance between the first inclined surface 12211 and the second inclined surface 141 in the extension direction perpendicular to the first inclined surface 12211 can always be the same. Thus, when welding and fixing the tab 132 to the pole post 12, under the cooperating and pressing action of the second inclined surface 141 and the first inclined surface 12211, the part of the tab 132 falling on the first inclined surface 12211 can always remain close to and fixed to the first inclined surface 12211 in the extension direction of the first inclined surface 12211, making the welding of the tab 132 to the first inclined surface 12211 more convenient and stable. The mating block 14 can use the cooperation of the second inclined surface 141 and the first inclined surface 12211 to stably and reliably press and fix the tab 132.

[0202] In some examples of the present invention, references Figure 3 As shown, in the axial direction of the connecting hole 1223, the end face of the mating block 14 facing the electrode assembly 13 can abut against the electrode assembly 13.

[0203] One end face of the mating block 14 facing the electrode assembly 13 abuts against the electrode assembly 13. Specifically, the end face of the mating block 14 facing the electrode assembly 13 can be flush with the end face of the electrode post body 122 facing the electrode assembly 13. When the battery cell 10 is assembled, one end of the mating block 14 facing the electrode assembly 13 abuts against the electrode assembly 13 with one end of the electrode post body 122 facing the electrode assembly 13. One end of the tab 132 extending from one end of the electrode assembly 13 facing the electrode post 12 extends into the connection hole 1223 and is clamped between the first inclined surface 12211 and the second inclined surface 141.

[0204] In this embodiment, the mating block 14 abuts against the electrode assembly 13, which can limit and fix the electrode assembly 13 and the tab 132 in the axial direction of the pole post 12, and also exert a certain pressure on the tab 132, so that the tab 132 can be inserted into the connection hole 1223 more stably, and the electrode assembly 13 can be more securely placed in the battery cell 10 after assembly.

[0205] In one example of the present invention, the mating block 14 can be welded to the pole post 12.

[0206] The mating block 14 is welded to the pole post 12. For example, the tab 132 and the pole post 12 can be welded and fixed by welding methods such as ultrasonic welding, laser welding or resistance hot melt welding.

[0207] In this embodiment, the mating block 14 and the pole post 12 are fixed by welding, which is convenient and reliable. The mating block 14 can stably and reliably cooperate with the connecting protrusion 1221 to clamp and fix the pole tab 132, so that the connection and fixation of the pole tab 132 and the pole post 12 is more stable and convenient.

[0208] In some examples of the present invention, such as Figure 9 As shown, a support protrusion 1222 can be formed on the peripheral wall of the connecting hole 1223. The support protrusion 1222 and the first inclined surface 12211 are arranged at intervals in the circumferential direction of the connecting hole 1223. One end of the mating block 14 is supported on the support protrusion 1222.

[0209] A support protrusion 1222 is formed on the peripheral wall of the connecting hole 1223. Specifically, the support protrusion 1222 can be an arc-shaped protrusion, a rectangular protrusion, a polygonal protrusion, etc. The support protrusion 1222 can extend radially inward along the connecting hole 1223, such as... Figure 9 As shown, the side surface of the support protrusion 1222 facing the electrode assembly 13 in the axial direction of the connection hole 1223 can be flush with the side surface of the electrode post body 122 facing the electrode assembly 13. The side surface of the support protrusion 1222 away from the electrode assembly 13 can support and fix the mating block 14 at one end in the radial direction of the connection hole 1223. The side surface of the support protrusion 1222 that supports and abuts against the mating block 14 can be set according to the shape of the side surface of the mating block 14 facing the electrode assembly 13 to support and fix the mating block 14.

[0210] In this embodiment, the support protrusion 1222 and the first inclined surface 12211 are arranged at intervals in the circumferential direction of the connecting hole 1223. That is, the end of the support protrusion 1222 facing the first inclined surface 12211 and the end of the first inclined surface 12211 facing the support protrusion 1222 are spaced apart in the radial direction of the connecting hole 1223. During assembly, the tab 132 can extend into the connecting hole 1223 from the space defined by the support protrusion 1222 and the first inclined surface 12211 in the radial direction of the connecting hole 1223. The mating block 14 is placed into the connecting hole 1223 to press and fix the tab 132 facing the first inclined surface 12211. One end of the mating block 14 is mated and fixed with the support protrusion 1222.

[0211] In this embodiment, a support protrusion 1222 is provided in the connection hole 1223 to support and fix the mating block 14. When the mating block 14 is assembled with the pole post 12, the support protrusion can provide good support and limit the mating block 14, reducing the possibility of the mating block 14 being excessively pressed down toward the first inclined surface 12211. This allows the mating block 14 and the first inclined surface 12211 to better cooperate and clamp the pole tab 132. The support protrusion 1222 can further improve the structural strength of the pole post 12 to a certain extent, making the structural stability of the pole post 12 better.

[0212] In one example of the present invention, such as Figure 9As shown, the side surface of the support protrusion 1222 facing the electrode assembly 13 and the side surface of the support protrusion 1222 facing the first inclined surface 12211 can be connected by an arc.

[0213] The side surface of the support protrusion 1222 facing the electrode assembly 13 is connected by an arc to the side surface of the support protrusion 1222 facing the first inclined surface 12211. The arc can be a semi-circular arc, a quarter-circular arc, etc. The radius of the arc can be reasonably set according to the need for the tab 132 to extend into the connection hole 1223 and the need for the mating block 14 to be fixed with the support protrusion 1222.

[0214] In this embodiment, the side surface of the support protrusion 1222 facing the electrode assembly 13 is connected by an arc to the side surface of the support protrusion 1222 facing the first inclined surface 12211. This can reduce the possibility of the tab 132 rubbing against the support protrusion 1222 when it extends from between the support protrusion 1222 and the connecting protrusion 1221 into the connecting hole 1223, making it easier and more convenient for the tab 132 to be connected and assembled with the pole post 12.

[0215] In one example of the invention, reference is made to... Figure 3 and Figure 9 As shown, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 can be 0°-60°.

[0216] For example, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 can be 10°, 20°, 30°, 40°, 50°, 60°, etc.

[0217] In this embodiment, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 is limited to between 0° and 60°. This makes the angle between the first inclined surface 12211 and the first plane and the angle between the second inclined surface 141 and the first plane acute angles within a small range. As a result, the inclination of the first inclined surface 12211 and the second inclined surface 141 in the radial direction of the connecting hole 1223 is relatively gentle. When welding the tab 132 and the pole post 12, since the welding direction of the welding equipment is perpendicular to the extension direction of the first inclined surface 12211 and the second inclined surface 141, the welding equipment can also be inserted into the connecting hole 1223 at a smaller angle to perform welding operations. This better reduces the interference caused by the hole wall of the connecting hole 1223 to the welding equipment, fixtures, etc., making it more convenient and easier to weld and fix the tab 132 and the pole post 12.

[0218] In some specific embodiments of the present invention, the angle between the first inclined plane 12211 and the second inclined plane 141 and the first plane is 0°-20°.

[0219] For example, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane perpendicular to the axis of the connecting hole 1223 can be 2°, 4°, 6°, 8°, 10°, 12°, 14°, 16°, 18°, etc.

[0220] In this embodiment, the angle between the first inclined surface 12211 and the second inclined surface 141 and the first plane is further limited to between 0° and 20°, so that the first inclined surface 12211 and the second inclined surface 141 can extend radially along the connecting hole 1223 more gently, and the first inclined surface 12211 and the second inclined surface 141 can better face each other on the side of the connecting hole 1223 away from the electrode assembly 13, so that welding equipment, fixtures, etc. can more easily, conveniently and quickly extend into and reach the welding position of the first inclined surface 12211 and the second inclined surface 141, making the welding and fixing of the tab 132 and the pole 12 more convenient and efficient.

[0221] In one example of the invention, reference is made to... Figure 9 As shown, the other end of the mating block 14 can extend to the other side wall of the connecting hole 1223 opposite to the support protrusion 1222.

[0222] The other end of the mating block 14 extends to the other side wall of the connecting hole 1223 opposite to the support protrusion 1222. Specifically, in the radial direction of the connecting hole 1223, one end of the mating block 14 can extend to the side wall of the connecting hole 1223 where the support protrusion 1222 is formed, and the other end of the mating block 14 can extend to the other side wall of the connecting hole 1223 opposite to the support protrusion 1222.

[0223] In this embodiment, by extending the other end of the mating block 14 to the side wall opposite to the support protrusion 1222 of the connecting hole 1223, the mating block 14 and the support protrusion 1222 can effectively seal the connecting hole 1223. This allows the end of the electrode tab 132 extending into the connecting hole 1223 to be relatively tightly sealed between the first inclined surface 12211 and the second inclined surface 141. This effectively reduces the probability of the welding point between the electrode tab 132 and the first inclined surface 12211 coming into contact with the external atmosphere through the connecting hole 1223, making the electrical connection between the electrode tab 132 and the electrode post 12 more stable and reliable. The mating block 14 and the side wall of the connecting hole 1223 can form a good abutment and fixing effect, allowing the mating block 14 to better reinforce the structure of the electrode post 12, making the overall structure of the electrode post 12 more stable and robust.

[0224] In some specific embodiments of the present invention, such as Figure 3 and Figure 9 As shown, the mating block 14, the tab 132 and the pole post 12 can be welded together as a whole.

[0225] After the mating block 14 is assembled with the tab 132 and the pole post 12, the mating block 14 can be welded and fixed to the pole post body 122, and the tab 132 can be welded and fixed to the connecting protrusion 1221 of the pole post 12. The tab 132 can also be welded and fixed to the mating block 14 and the connecting protrusion 1221. When welding the mating block 14 with the tab 132 and the connecting protrusion 1221, the welding equipment can weld and fix the mating block 14, the tab 132 and the connecting protrusion 1221 together from the side of the mating block 14 away from the tab 132. The mating block 14, the tab 132 and the connecting protrusion 1221 can be connected by a single weld.

[0226] In this embodiment, the mating block 14 is welded to the tab 132 and the pole post 12 as a whole, so that the mating block 14 is more firmly and reliably connected to the tab 132 and the pole post 12, and the mating block 14 and the pole post 12 can be more securely fixed to the tab 132.

[0227] In one embodiment of the present invention, the material of the mating block 14 may be the same as the material of the pole post 12.

[0228] For example, when the pole post 12 is made of copper, the mating block 14 can also be made of copper; when the pole post 12 is made of aluminum alloy, the mating block 14 can also be made of aluminum alloy, and so on.

[0229] In this embodiment, the material of the mating block 14 is set to be the same as that of the pole post 12, which makes it easier to weld and fix the mating block 14 and the pole post 12, the welding is more solid, and the welding effect is better.

[0230] In some embodiments of the present invention, such as Figure 3 As shown, the active material coating part 131 includes a current collector and an active material layer disposed on the current collector. The tab 132 is electrically connected to the current collector. The tab 132 includes a plurality of tab pieces. The plurality of tab pieces converge near the current collector to form a first gathering part 1321. The plurality of tab pieces converge and connect away from the current collector to form a second gathering part 1322. The first gathering part 1321 connects the second gathering part 1322 and the active material coating part 131. At least a portion of the second gathering part 1322 extends into the connection hole 1223 and is connected to the first inclined surface 12211.

[0231] The electrode 132 includes multiple layers of electrode plates, such as three, four, five, six, seven, eight, etc.

[0232] Electrode 132 is led out by the current collector, see reference. Figure 3As shown, multiple tabs converge from the surface of the active material coating portion 131 toward the electrode post 12 toward the connection hole 1223 of the electrode post 12. The spacing between the multiple tabs gradually decreases until they are stacked and attached to each other. During the processing of the tab 132, the tab 132 forms a second converged portion 1322 by pre-welding in the stacked and attached portion. In the direction from the active material coating portion 131 toward the electrode post 12, the portion between the multiple tabs with a certain spacing and the portion of the tab 132 that is not pre-welded in the stacked and attached portion form a first converged portion 1321.

[0233] When the tab 132 is welded and fixed to the pole post 12, the second folding part 1322 of the tab 132 can be partially inserted into the connecting hole 1223 and connected and fixed to the first inclined surface 12211, or the second folding part 1322 of the tab 132 can be fully inserted into the connecting hole 1223 and connected and fixed to the first inclined surface 12211.

[0234] In this embodiment, multiple tabs are brought together to form a tab 132, which makes it easier to reliably connect and fix the tabs to the pole post 12 via the second gathering part 1322 when welding and fixing the tabs 132 and the pole post 12. The second gathering part 1322 can have a smaller size and thickness, making it easier and more convenient for the tabs 132 to be inserted into the connection hole 1223 and fit and fix with the first inclined surface 12211.

[0235] Optionally, the connection position of the first gathering portion 1321 and the second gathering portion 1322 can be configured to correspond to the opening of the connecting hole 1223 on one side facing the electrode assembly 13. That is, on the projection plane perpendicular to the axis of the pole post 12, the projection of the connection position of the first gathering portion 1321 and the second gathering portion 1322 on the projection plane is within the projection range of the opening on one side of the connecting hole 1223. When the electrode tab 132 is connected and assembled with the pole post 12, the second gathering portion 1322 extends into the connecting hole 1223 from the opening on one side of the connecting hole 1223 and is connected and fixed to the pole post 12.

[0236] This allows the second folding portion 1322 to extend into the connection hole 1223 with a shorter distance, thereby reducing the redundancy of the tab 132 and lowering the cost, and to some extent improving the energy density of the battery cell 10.

[0237] In one embodiment of the present invention, reference is made to... Figure 3 and Figure 9 As shown, at least a portion of the first gathering portion 1321 can extend into the connecting hole 1223 and extend along the first inclined surface 12211.

[0238] At least a portion of the first gathering portion 1321 extends into the connecting hole 1223 and extends along the first inclined surface 12211. That is, the first gathering portion 1321 can extend partially into the connecting hole 1223, or the first gathering portion 1321 can extend completely into the connecting hole 1223.

[0239] In this embodiment, at least a portion of the first gathering portion 1321 extends into the connection hole 1223 and extends along the first inclined surface 12211, which allows the tab 132 and the first inclined surface 12211 to have a longer contact and fixing dimension, thereby making the connection and fixing of the tab 132 and the first inclined surface 12211 more stable and reliable. The tab 132 occupies less space in the housing 11, thereby allowing the active material coating portion 131 to be enlarged to increase the energy density of the battery cell 10, and further reducing the redundancy of the tab 132 in the housing 11, further reducing the probability of short circuit between the tab 132 and the active material coating portion 131, thereby making the battery cell 10 more stable and reliable in use.

[0240] In one embodiment of the present invention, the ratio of the overlap width of the second gathering portion 1322 on the first inclined surface 12211 to the width of the first inclined surface 12211 is greater than or equal to 0.5.

[0241] The overlap width between the second gathering portion 1322 and the first inclined surface 12211 refers to the length of the second gathering portion 1322 extending along the first inclined surface 12211, and the width of the first inclined surface 12211 refers to the length of the first inclined surface 12211 extending axially along the pole post 12. (Reference) Figure 4 and Figure 5 As shown, Figure 4 In the middle, L5 represents the width of the first inclined plane 12211. Figure 5 L6 represents the overlap width. The ratio of the overlap width of the second gathering part 1322 on the first inclined surface 12211 to the width of the first inclined surface 12211 is greater than or equal to 0.5. For example, the ratio can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, etc.

[0242] In this embodiment, the width of the overlap between the second gathering part 1322 and the first inclined surface 12211 is limited to greater than or equal to 0.5. This allows the second gathering part 1322 and the first inclined surface 12211 to have sufficient overlap length so that the second gathering part 1322 can be stably and firmly connected to the first inclined surface 12211, thereby making the connection between the electrode tab 132 and the electrode post 12 stable and reliable.

[0243] In some examples of the present invention, the ratio of the overlap width of the second gathering portion 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8-1.2.

[0244] The ratio of the overlap width of the second gathering part 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is 0.8-1.2. For example, the ratio can be 0.8, 0.9, 1, 1.1, 1.2, etc.

[0245] In this embodiment, the ratio of the overlap width of the second gathering part 1322 and the first inclined surface 12211 to the width of the first inclined surface 12211 is further limited, so that the second gathering part 1322 and the first inclined surface 12211 can overlap and cooperate better. The second gathering part 1322 can maintain a large overlap surface and overlap length with the first inclined surface 12211, so that the connection and fixation between the tab 132 and the pole post 12 is more stable and reliable. It can also reduce the redundant size of the first inclined surface 12211 or the second gathering part 1322, so that the second gathering part 1322 and the first inclined surface 12211 can cooperate and abut more easily, thereby reducing the space occupied by the tab 132 and the pole post 12 in the battery cell 10 to a certain extent.

[0246] In one embodiment of the present invention, a plurality of tabs of the tab 132 may be pre-welded together in the second gathering portion 1322.

[0247] Before the electrode tabs 132 and the electrode post 12 are welded together, multiple layers of electrode tabs are stacked and gathered to form a second gathered portion 1322. The welding equipment pre-welds the multiple layers of electrode tabs at the second gathered portion 1322 so that the multiple electrode tabs of the electrode tabs 132 facing the electrode post 12 at the second gathered portion 1322 are connected. Optionally, the multiple electrode tabs at the second gathered portion 1322 can be welded together by ultrasonic pre-welding.

[0248] It is understandable that the pre-welding width required for multi-layer tabs is relatively small. The pre-welding connection of multiple tabs of tab 132 in the second gathering part 1322 can shorten the size of tab 132 to a certain extent during processing and manufacturing, thereby making tab 132 shorter. This allows the height of the pole post 12 that is fixed with tab 132 to be set to be shorter, thereby further improving the energy density of the battery cell 10.

[0249] In this embodiment, by pre-welding the second gathering portion 1322 of the tab 132, the interlayer gap can be reduced, allowing the loose multiple tabs to form a plate structure with a certain rigidity in the second gathering portion 1322. This makes the second gathering portion 1322 less prone to relative movement and stretching during overall movement or bending, resulting in better overall integrity of the second gathering portion 1322. The second gathering portion 1322 can be bent towards the first inclined surface 12211 or welded to the first inclined surface 12211 more stably, effectively reducing the possibility of cracking when welding the tab 132 to the pole post 12, and making the welding and fixing of the tab 132 to the pole post 12 more stable and reliable. Optionally, the multiple tabs in the second gathering portion 1322 can also be connected and fixed by means of conductive adhesive, etc., which will not be listed here.

[0250] In one embodiment of the present invention, the pre-welding width of the second gathering portion 1322 may be greater than or equal to 1.5 mm.

[0251] In this embodiment, the pre-welding width of the second gathering part 1322 is greater than or equal to 1.5mm. For example, the pre-welding width can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0252] In this embodiment, the pre-welding width of the second gathering part 1322 is set to be greater than or equal to 1.5mm. This allows the pre-welding of the tab 132 to have sufficient width, so that when the tab 132 is bent or abutted against the first inclined surface 12211, the overall structural strength of the tab 132 at the pre-welding point is sufficient to resist the tensile deformation and other stresses generated by the tab 132. This ensures that the tab 132 maintains a good and stable structural state during assembly, making the welding and fixing operation of the tab 132 and the pole post 12 more stable and smooth.

[0253] In some embodiments of the present invention, such as Figure 13 As shown, the battery cell 10 may further include: a cover plate 15, which covers one end of the connection hole 1223 away from the electrode assembly 13, and the cover plate 15 is sealed to the electrode post 12.

[0254] The cover plate 15 can be made of materials such as copper, zinc, aluminum, or copper-aluminum alloy. The shape of the cover plate 15 can be adapted to the cross-sectional shape of the connection hole 1223, and the thickness of the cover plate 15 can be reasonably set as needed. When the battery cell 10 is assembled, after the tab 132 is assembled with the terminal post 12 and the mating block 14, the cover plate 15 should be set at the end of the connection hole 1223 opposite to the electrode assembly 13.

[0255] In this embodiment, the cover plate 15 is provided to seal the terminal post 12, which can reliably seal the mating block 14 and the electrode tab 132 structure located in the connection hole 1223. After the electrode tab 132 and the terminal post 12 are welded and fixed, they can be in a good closed environment, so that the connection between the electrode tab 132 and the terminal post 12 is stable and good during long-term use. The cover plate 15 can cooperate with the terminal post 12 to transmit electricity. The cover plate 15 can form a good electrical connection surface, so that the battery cell 10 can be connected to the electrical connector more conveniently during use.

[0256] In one embodiment of the present invention, reference is made to... Figure 13 and Figure 4 As shown, a groove 1224 can be formed on the side surface of the electrode post 12 away from the electrode assembly 13. A connecting hole 1223 is formed inside the groove 1224 and penetrates the bottom wall of the groove 1224. A cover plate 15 is disposed in the groove 1224.

[0257] The shape of the groove 1224 can match the shape and structure of the periphery of the cover plate 15, and the depth of the groove 1224 can be adapted to the thickness of the cover plate 15. The axis of the groove 1224 can be collinear with the axis of the connecting hole 1223. When the cover plate 15 is assembled with the electrode post 12, the surface of the cover plate 15 facing the electrode assembly 13 abuts against the bottom of the groove 1224, and the periphery of the cover plate 15 abuts against the wall of the groove 1224.

[0258] In this embodiment, a groove 1224 is provided on the pole post 12, which makes it easier to position the cover plate 15 and the pole post 12 when they are fixed, and the connection and fixation are more stable and reliable.

[0259] In some examples of the present invention, references Figure 13 and Figure 4 As shown, in the direction from the electrode assembly 13 toward the cover plate 15, the sidewall of the groove 1224 can extend radially outward along the connection hole 1223.

[0260] The sidewall of the groove 1224 extends outward along the radial direction of the connecting hole 1223. The inclination angle of the sidewall can be reasonably set according to the installation and fixing requirements of the cover plate 15. The extension direction of the sidewall of the groove 1224 can be consistent with the extension direction of the periphery of the cover plate 15. The sidewall of the groove 1224 can abut against the periphery of the cover plate 15.

[0261] In this embodiment, the sidewall of the groove 1224 extends radially outward along the connecting hole 1223, which can provide a certain guiding effect during the assembly of the cover plate 15 and the pole post 12, making it easier to fix the cover plate 15 in the groove 1224. The structure is simple and easy to assemble. When the cover plate 15 and the pole post 12 are welded together, the periphery of the cover plate 15 and the inclined sidewall of the groove 1224 can increase the welding width, resulting in higher welding quality and a better welding seal between the cover plate 15 and the pole post 12.

[0262] In some examples of the present invention, references Figure 13 and Figure 4 As shown, the side surface of the cover plate 15 away from the electrode assembly 13 can be flush with the end face of the electrode post 12 away from the electrode assembly 13.

[0263] After the cover plate 15 is assembled with the electrode post 12, the cover plate 15 can cooperate with the electrode post 12 to form a continuous plane on the side of the electrode post 12 away from the electrode assembly 13. Specifically, the surface of the second ring 123 away from the electrode assembly 13 can be flush with the surface of the electrode post 12 away from the electrode assembly 13 and the surface of the cover plate 15 away from the electrode assembly 13. The cover plate 15 can be bonded or welded to the electrode post 12.

[0264] In this embodiment, the side surface of the cover plate 15 facing away from the electrode assembly 13 is flush with one end face of the electrode post 12 facing away from the electrode assembly 13. This allows the cover plate 15 and the electrode post 12 to form a continuous plane, thereby reducing the space occupied by the cover plate 15 to a certain extent and increasing the electrical connection surface of the electrode post 12 of the battery cell 10. This can improve the energy density of the battery cell 10 to a certain extent, and make it easier for the battery cell 10 to be electrically connected to the electrical connector through one end of the electrode post 12 facing away from the electrode assembly 13.

[0265] The following is for reference. Figures 3-8 The following describes a method for preparing a battery cell 10 according to a second aspect embodiment of the present invention. The battery cell 10 is the same as the battery cell 10 according to a first aspect embodiment of the present invention. The preparation method includes: inserting one end of a tab 132 into a connection hole 1223 of a terminal post 12; making one side surface of one end of the tab 132 in the thickness direction abut against a first inclined surface 12211; and welding one end of the tab 132 to the first inclined surface 12211.

[0266] One end of the tab 132 refers to the end of the tab 132 that is away from the electrode assembly 13, which is the second converged portion 1322 of the tab 132. The tab 132 extends out from the electrode assembly 13, and one end of the tab 132 extends into the connection hole 1223 of the electrode post 12. The tab 132 is composed of multiple layers of tab sheets, which are stacked and arranged. When the tab 132 extends into the connection hole 1223 and abuts against the first inclined surface 12211, one surface of the tab 132 in the stacking direction of the tab sheets fits against the first inclined surface 12211. The first inclined surface 12211 is an inclined surface that is radially outward in the axial direction of the electrode post 12. After the tab 132 extends into the connection hole 1223, it bends and tilts towards the first inclined surface 12211 to fit against the first inclined surface 12211.

[0267] According to the method for preparing the battery cell 10 according to the embodiment of the present invention, by inserting the tab 132 into the connection hole 1223 of the terminal post 12 and abutting against and welding it to the first inclined surface 12211, the tab 132 can occupy less space in the battery cell 10, reduce the weight of the tab 132 and the terminal post 12, thereby greatly improving the energy density of the battery cell 10.

[0268] In some embodiments of the present invention, one end of the tab 132 abuts against the first inclined surface 12211 on one side surface in the thickness direction, including: inserting the mating block 14 into the connecting hole 1223, and pressing one end of the tab 132 against the first inclined surface 12211 until it abuts against the first inclined surface 12211 by the mating block 14.

[0269] When the mating block 14 is inserted into the connecting hole 1223, one end of the tab 132 is located between the second inclined surface 141 and the first inclined surface 12211 of the mating block 14. As the mating block 14 moves toward the electrode assembly 13, the tab 132 gradually tilts and bends toward the first inclined surface 12211 under the pushing action of the second inclined surface 141 and finally abuts against the first inclined surface 12211.

[0270] In this embodiment, by using the mating block 14 to press one end of the tab 132 against the first inclined surface 12211, the tab 132 can be stably and reliably fitted and abutted against the first inclined surface 12211 under the action of the mating block 14, making it easier and more convenient for the tab 132 to abut and fix against the first inclined surface 12211.

[0271] In one embodiment of the present invention, the preparation method further includes: sealing a cover plate 15 on one end of the electrode assembly 13 away from the connection hole 1223, and welding the cover plate 15 to the electrode post 12.

[0272] A groove 1224 is formed at one end of the electrode post 12 away from the electrode assembly 13. The cover plate 15 is assembled in the groove 1224 and seals the connection hole 1223. After the cover plate 15 is assembled with the electrode post 12, it is welded to the electrode post 12.

[0273] In this embodiment, the cover plate 15 is welded and sealed to one end of the pole post 12 away from the electrode assembly 13. This can increase the electrical connection surface of the pole post 12 and seal the electrode assembly 13 and the tab 132 inside the housing 11, making it easier for the battery cell 10 to connect with the electrical connector during use, and making the battery cell 10 more stable in use.

[0274] In some embodiments of the present invention, before one end of the tab 132 is inserted into the connection hole 1223 of the pole post 12, the preparation method further includes: pre-welding multiple tab pieces of the tab 132 together.

[0275] Multiple tabs are stacked to form tab 132, and the multiple tabs can be connected into one piece by ultrasonic pre-welding to form one end of tab 132.

[0276] In this embodiment, multiple tabs of the tab 132 are connected into one piece by pre-welding, which can reduce the gap between the tabs and make one end of the tab 132 more compact, thereby facilitating the subsequent insertion of the tab 132 into the connection hole 1223, etc.

[0277] The following is for reference. Figures 2-13 A battery 100 according to an embodiment of a third aspect of the present invention is described.

[0278] like Figures 2-13 As shown, the battery 100 according to an embodiment of the present invention includes a battery cell 10 according to a first aspect embodiment of the present invention.

[0279] Other configurations and operations of the battery 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0280] According to the battery 100 of the present invention, by providing the battery cell 10 of the first aspect embodiment described above, a connecting hole 1223 is provided on the terminal post 12, and at least a portion of the inner wall of the connecting hole 1223 is formed as a first inclined surface 12211. One end of the tab 132 extends into the connecting hole 1223 and is fixedly connected to the first inclined surface 12211. This allows the tab 132 to occupy less space in the battery cell 10, reducing the weight of the tab 132 and the terminal post 12, thereby significantly improving the energy density of the battery cell 10.

[0281] The following is for reference. Figures 1-13 An electrical appliance 1000 according to an embodiment of a fourth aspect of the present invention is described.

[0282] like Figures 1-13 As shown, the battery 100 according to an embodiment of the present invention includes a battery cell 10 according to a third aspect embodiment of the present invention.

[0283] Other configurations and operations of the electrical device 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0284] According to the embodiment of the present invention, the power device 1000, by providing the battery 100 of the third aspect embodiment described above, provides a connecting hole 1223 through the terminal post 12, and at least a portion of the inner wall of the connecting hole 1223 is formed as a first inclined surface 12211. One end of the tab 132 extends into the connecting hole 1223 and is fixedly connected to the first inclined surface 12211. This allows the tab 132 and the terminal post 12 to occupy less space in the battery cell 10, reducing the weight of the tab 132 and the terminal post 12, thereby significantly improving the energy density of the battery cell 10.

[0285] The following will refer to Figures 1-13 The present invention describes an electrical device 1000 according to two specific embodiments.

[0286] Example 1,

[0287] like Figure 1 and Figure 2 As shown, the electrical device 1000 according to the fourth aspect of the present invention is a vehicle, and the electrical device 1000 includes a battery 100 according to the second aspect of the present invention, the battery 100 being used to provide or store electrical energy.

[0288] like Figures 3-8 and Figure 13 As shown, the battery 100 includes a housing 11, terminals 12, a cover plate 15, a mating block 14, an electrode assembly 13, and terminals 12. The housing 11 has a receiving cavity 112 and mounting holes. There are two mounting holes that communicate with the receiving cavity 112. The electrode assembly 13 is disposed in the receiving cavity 112. The electrode assembly 13 includes an electrode sheet and a separator. The electrode sheet has a current collector and an active material layer. The active material layer is coated on the current collector to form an active material coating portion 131 of the electrode assembly 13. The portion of the current collector that is not coated with the active material layer protrudes from the active material coating portion 131 to form a tab. There are multiple tabs. The multiple tabs converge towards one end of the mounting hole to form a tab 132. The end of the tab 132 facing the active material coating portion 131 forms a first convergence portion 1321. The end of the tab 132 facing the terminal 12 is stacked to form a second convergence portion 1322. The tab 132 includes a positive tab 132 and a negative tab 132.

[0289] Two electrode posts 12 are provided, and each electrode post 12 is arranged in a corresponding manner to a mounting hole, with the electrode post 12 passing through the mounting hole. The electrode post 12 includes an electrode post body 122, a first ring 121, and a second ring 123. The electrode post body 122 is a hollow annular structure. The first ring 121 is integrally formed with the electrode post body 122 and is located within the receiving cavity 112. The first ring 121 is arranged around the outer peripheral surface of the electrode post body 122. The side surface of the first ring 121 facing the electrode assembly 13 is flush with the side surface of the electrode post body 122 facing the electrode assembly 13, and the other side abuts against the inner wall of the housing 11. The second ring 123 is integrally formed with the electrode post body 122 and is located outside the housing 11. The second ring 123 is arranged around the outer peripheral surface of the electrode post body 122. The side surface of the second ring 123 facing away from the electrode assembly 13 is flush with the side surface of the electrode post body 122 facing away from the electrode assembly 13, and the other side abuts against the housing 11.

[0290] A connecting protrusion 1221 is formed on the inner wall of the electrode post 12. The connecting protrusion 1221 and the electrode post body 122 cooperate to form a connecting hole 1223. The side surface of the connecting protrusion 1221 facing the electrode assembly 13 is flush with the side surfaces of the electrode post 12 and the first ring 121 facing the electrode assembly 13. A first inclined surface 12211 is formed on the side surface of the connecting protrusion 1221 away from the electrode assembly 13. The first inclined surface 12211 extends obliquely from the end facing the electrode assembly 13 to the end away from the electrode assembly 13 towards the inner wall surface of the electrode post 12.

[0291] The mating block 14 is disposed in the connecting hole 1223 and has a second inclined surface 141 parallel to the first inclined surface 12211. The mating block 14 and the connecting protrusion 1221 are arranged radially spaced in the connecting hole 1223. The mating block 14 abuts against the hole wall of the connecting hole 1223. One end of the pole lug 132 extends into the connecting hole 1223 and is clamped and fixed between the first inclined surface 12211 and the second inclined surface 141.

[0292] A groove 1224 is formed at one end of the electrode post 12 away from the electrode assembly 13. A connecting hole 1223 is passed through the bottom of the groove 1224. The opening of the groove 1224 gradually increases. A cover plate 15 is placed in the groove 1224 and seals the connecting hole 1223.

[0293] During the assembly of the battery cell 10, multiple tabs in the electrode assembly 13 are pre-welded together. The electrode assembly 13 is placed in the receiving cavity 112 of the housing 11. The pole post 12 passes through the mounting hole and is fixed to the housing 11 by the first ring 121 and the second ring 123 and abuts against the electrode assembly 13. One end of the tab 132 extends into the connecting hole 1223. The mating block 14 is placed into the connecting hole 1223 and moves toward the electrode assembly 13. The tab 132 is clamped between the first inclined surface 12211 and the second inclined surface 141 under the action of the mating block 14 and the connecting protrusion 1221. The welding equipment welds the tab 132, the pole post 12 and the mating block 14. After the welding is completed, the cover plate 15 is sealed in the groove 1224 of the pole post 12 and welded to the pole post 12, thereby completing the assembly of the battery cell 10.

[0294] According to the embodiment of the present invention, the electrical device 1000 provides a connecting hole 1223 through the terminal post 12, and at least a portion of the inner wall of the connecting hole 1223 is formed as a first inclined surface 12211. One end of the tab 132 extends into the connecting hole 1223 and is fixedly connected to the first inclined surface 12211. This allows the tab 132 to occupy less space in the battery cell 10, reducing the weight of the tab 132 and the terminal post 12, thereby significantly improving the energy density of the battery cell 10.

[0295] Example 2,

[0296] like Figures 9-12 As shown, the structure of this embodiment is roughly the same as that of Embodiment 1, with the same reference numerals used for the same components. The only difference is that a support protrusion 1222 is formed on the inner wall of the connecting hole 1223, which is radially opposite to the connecting protrusion 1221 in the connecting hole 1223. The mating block 14 is fixed on the support protrusion. The inclination angle of the first inclined surface 12211 is further limited to between 0° and 20°. This can limit the movement of the mating block 14, reduce the probability of the mating block 14 over-pressing the tab 132, and make the mating block 14 fit better with the tab 132 and the pole post 12. The welding equipment is more convenient and easier to operate when welding the tab 132 and the mating block 14.

[0297] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions 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, and they should all be covered within the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The application relates to a battery pole, comprising: a shell (11) comprising a first wall (111); a pole column (12) arranged on the first wall (111) and formed with a connecting hole (1223) penetrating through the pole column (12), at least part of the inner peripheral wall of the connecting hole (1223) being formed as a first inclined surface (12211) which is arranged to be inclined relative to the axis of the connecting hole (1223); an electrode assembly (13) comprising an active material coating portion (131) arranged in the shell (11) and a tab (132) electrically connected to the active material coating portion (131), at least part of the tab (132) extending into the connecting hole (1223) and being connected to the first inclined surface (12211).

2. The battery cell of claim 1, wherein, The tab (132) is welded to the pole column (12).

3. The battery cell of claim 1, wherein, In the direction from the electrode assembly (13) to the pole column (12), the first inclined surface (12211) extends outward along the radial direction of the connecting hole (1223).

4. The battery cell of claim 1, wherein, The included angle between the first inclined surface (12211) and a first plane perpendicular to the axis of the connecting hole (1223) is 0-70 degrees; or The included angle between the first inclined surface (12211) and the first plane is 30-60 degrees.

5. The battery cell of claim 1, wherein, The pole column (12) comprises a pole column (12) body which is a hollow ring, a connecting protrusion (1221) is arranged on the inner wall surface of the pole column (12) body, and the pole column (12) body and the connecting protrusion (1221) cooperatively define the connecting hole (1223), and the first inclined surface (12211) is formed on the connecting protrusion (1221).

6. The battery cell of claim 5, wherein, In the axial direction of the connecting hole (1223), at least part of the side surface of the connecting protrusion (1221) away from the electrode assembly (13) is formed as the first inclined surface (12211).

7. The battery cell of claim 6, wherein, The first inclined surface (12211) has a welding area, and the tab (132) is welded to the welding area, In the axial direction of the connecting hole (1223), the thickness of the connecting protrusion (1221) at the position of the welding area is a first thickness, and the depth of a molten pool formed at the position of the welding area of the connecting protrusion (1221) when the tab (132) is welded to the connecting protrusion (1221) is a first depth, and the first thickness is greater than the first depth.

8. The battery cell of claim 7, wherein, The difference between the first thickness and the first depth is greater than or equal to 0.2 mm.

9. The battery cell of claim 8, wherein, The difference between the first thickness and the first depth is greater than or equal to 0.5 mm.

10. The battery cell of claim 6, wherein, The first inclined surface (12211) is circularly connected to the side surface of the connecting protrusion (1221) facing the electrode assembly (13).

11. The battery cell of claim 6, wherein, The side surface of the connecting protrusion (1221) facing the electrode assembly (13) is flush with the side surface of the pole column (12) body facing the electrode assembly (13).

12. The battery cell of claim 6, wherein, The minimum width of the connecting hole (1223) is greater than or equal to 3 mm.

13. The battery cell of claim 6, wherein, The ratio of the minimum width of the connecting hole (1223) to the thickness of the tab (132) is 1.5-5; or, the ratio of the minimum width of the connecting hole (1223) to the thickness of the tab (132) is 2.5-5.

14. The battery cell of claim 6, wherein, The ratio of the minimum width of the connecting hole (1223) to the maximum width of the connecting hole (1223) is 0.3-0.5; or, the ratio of the minimum width of the connecting hole (1223) to the maximum width of the connecting hole (1223) is 0.35-0.

45.

15. The battery cell of claim 5, wherein, The pole column (12) further comprises: A first ring (121) connected at one end of the pole column (12) body facing the electrode assembly (13), the first ring (121) extending radially outward along the pole column (12) body and extending annularly along the circumference of the pole column (12) body; A second ring (123) connected at the other end of the pole column (12) body away from the electrode assembly (13), the second ring (123) extending radially outward along the pole column (12) body and extending annularly along the circumference of the pole column (12) body.

16. The battery cell of any one of claims 1-15, wherein, Further comprising: A fitting block (14) provided in the connecting hole (1223), and the tab (132) abuts between the fitting block (14) and the first inclined surface (12211).

17. The battery cell of claim 16, wherein, The fitting block (14) has a second inclined surface (141) parallel to the first inclined surface (12211), and the tab (132) abuts between the first inclined surface (12211) and the second inclined surface (141).

18. The battery cell of claim 17, wherein, In the axial direction of the connecting hole (1223), the end face of the fitting block (14) facing the electrode assembly (13) abuts against the electrode assembly (13).

19. The battery cell of claim 18, wherein, The fitting block (14) is welded to the pole column (12).

20. The battery cell of claim 17, wherein, A support protrusion (1222) is formed on the peripheral wall of the connecting hole (1223), the support protrusion (1222) and the first inclined surface (12211) are arranged at intervals in the circumferential direction of the connecting hole (1223), and one end of the fitting block (14) is supported on the support protrusion (1222).

21. The battery cell of claim 20, wherein, The included angle between the first inclined surface (12211) and the second inclined surface (141) and the first plane perpendicular to the axis of the connecting hole (1223) is 0°-60°.

22. The battery cell of claim 21, wherein, The included angle between the first inclined surface (12211) and the second inclined surface (141) and the first plane is 0°-20°.

23. The battery cell of claim 20, wherein, The other end of the fitting block (14) extends to the other side wall of the connecting hole (1223) opposite the support protrusion (1222).

24. The battery cell of claim 23, wherein, The fitting block (14), the tab (132) and the pole column (12) are welded to form an integral whole.

25. The battery cell of claim 16, wherein, The material of the fitting block (14) is the same as that of the pole column (12).

26. The battery cell of claim 1, wherein, The active material coating portion (131) includes a current collector and an active material layer provided on the current collector, the tab (132) is electrically connected with the current collector, the tab (132) includes a plurality of tab (132) pieces, the plurality of tab (132) pieces converge to form a first gathering portion (1321) near the current collector, the plurality of tab (132) pieces converge and are connected to form a second gathering portion (1322) away from the current collector, the first gathering portion (1321) is connected with the second gathering portion (1322) and the active material coating portion (131), at least part of the second gathering portion (1322) extends into the connecting hole (1223) and is connected with the first inclined surface (12211).

27. The battery cell of claim 26, wherein, At least part of the first gathering portion (1321) extends into the connecting hole (1223) and extends along the first inclined surface (12211).

28. The battery cell of claim 26, wherein, The ratio of the overlap width of the second gathering portion (1322) on the first inclined surface (12211) to the width of the first inclined surface (12211) is greater than or equal to 0.

5.

29. The battery cell of claim 28, wherein, The ratio of the overlap width of the second gathering portion (1322) on the first inclined surface (12211) to the width of the first inclined surface (12211) is 0.8-1.

2.

30. The battery cell of claim 1, wherein, Further comprising: A cover plate (15) covers one end of the connecting hole (1223) away from the electrode assembly (13), and the cover plate (15) is sealingly connected with the pole column (12).

31. The battery cell of claim 30, wherein, A groove (1224) is formed on the side surface of the pole column (12) away from the electrode assembly (13), the connecting hole (1223) is formed on the inner side of the groove (1224) and penetrates the bottom wall of the groove (1224), and the cover plate (15) is arranged in the groove (1224).

32. The battery cell of claim 31, wherein, In the direction from the electrode assembly (13) to the cover plate (15), the side wall of the groove (1224) extends outwardly and inclinedly along the radial direction of the connecting hole (1223).

33. The battery cell of claim 31, wherein, The side surface of the cover plate (15) away from the electrode assembly (13) is flush with the end surface of the one end of the pole column (12) away from the electrode assembly (13).

34. A method of producing a battery cell, characterized by, The battery cell is the battery cell according to any one of claims 1-33, and the preparation method comprises: One end of the tab (132) extends into the connecting hole (1223) of the pole column (12); The side surface of the one end of the tab (132) in the thickness direction is abutted with the first inclined surface (12211); The one end of the tab (132) is welded to the first inclined surface (12211).

35. The method of claim 34, wherein the battery cell is prepared by a method comprising: The abutting of the side surface of the one end of the tab (132) in the thickness direction with the first inclined surface (12211) comprises: ​ The fitting block (14) is put into the connecting hole (1223), and the one end of the tab (132) is pressed towards the first inclined surface (12211) through the fitting block (14) until abutting with the first inclined surface (12211).

36. A battery, comprising: A battery cell comprising any of claims 1-33.

37. An electrical device, comprising: A battery comprising the battery of claim 36 for providing electrical energy.

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