36results about How to "Guaranteed overcurrent capability" patented technology

The present invention relates to the technical field of batteries, and discloses a battery, which comprises: a shell, which comprises a pole assembly; the cylindrical roll core comprises a roll core body and a plurality of tabs led out from the roll core body; the tab is used for being electrically connected with a pole assembly or a shell; the plurality of tabs are distributed in multiple layers in the radial direction of the roll core body; the width E of a single tab is greater than or equal to 2mm and less than or equal to 9mm; the difference value between the maximum thickness and the minimum thickness of the roll core body is d, the number of winding layers of the roll core body is n, and d * n is larger than or equal to 0.08 and smaller than or equal to 0.9. According to the battery provided by the invention, by comprehensively controlling the relationship between the difference value d of the maximum thickness and the minimum thickness of the roll core body and the number n of winding layers of the battery core, the tab alignment degree in the radial direction of the battery core can be ensured as much as possible, the tab dislocation condition is effectively reduced, the gap between the front layer and the rear layer after winding is relatively uniform, and the effective welding area is ensured; and the overcurrent capability is ensured.

The utility model relates to the technical field of battery energy, in particular to a battery cell and a battery. The battery cell comprises a battery cell body and at least three tab assemblies, the tab assembly is positioned at the end part of the battery cell body, comprises a plurality of tabs which are arranged in a stacked manner, and is provided with an overcurrent area; the size of the tab in the length direction of the pole piece is less than or equal to 45mm; the total area S of the overcurrent areas of all the tab assemblies meets the condition that S is greater than or equal to I / (K * F); wherein I is the maximum current threshold value allowed to pass through in the overcurrent region, K is the current-carrying capacity per unit area in the overcurrent region, and F is a correction coefficient; k is greater than or equal to 5A / mm < 2 > and less than or equal to 10A / mm < 2 >, I is greater than or equal to twice of the standard capacity of the battery, and the value range of F is 0.5-0.9. According to the battery cell provided by the invention, the tabs are not easy to fold, and after the battery cell is arranged in the battery, the over-current capability of the battery can be met, and the temperature rise of the battery in the charging and discharging process is reduced.

The present application provides a pole, a terminal assembly and a battery, the pole comprising: a base having a first surface; the column body is arranged on the first surface and provided with a second surface deviating from the base, and a heat conduction groove is formed in the second surface and filled with a heat conduction material. The heat conduction groove is formed in the second surface, deviating from the base, of the post body of the post, and the heat conduction groove is filled with the heat conduction material, so that heat dissipation of the post can be accelerated, heat accumulation of the post is avoided, and the risk of thermal runaway of the battery is reduced.

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery cell, the pole assembly is electrically connected with the battery cell, a groove is formed in the side, away from the battery cell, of the first part, the second part is arranged in the groove, the maximum thickness of the second part is D, the groove is provided with an open end face, and the maximum size formed by the two opposite ends of the end face, away from the battery cell, of the second part is L, the distance between the outer edge of the end face, deviating from the battery cell, of the second part and the circumferential outermost end of the first part is d; the battery shell and the battery cell are arranged in the battery shell, the pole assembly is arranged in the pole through hole in a penetrating manner, a fixing part is arranged on the battery shell, the fixing part is bent into a connecting section and a pressing section, so that the pole assembly is clamped between the pressing section and the battery shell, and D * d / L2 is more than or equal to 0.00002 and less than or equal to 1, so that the overall overcurrent capacity of the pole assembly can be effectively controlled; and the risk of fixing failure of the fixing part is reduced, so that the safe use performance of the battery is reliably improved.

The utility model belongs to the technical field of batteries, and discloses a pole piece, a battery cell and a battery module, the pole piece comprises a pole piece body and N tabs, and the pole piece body has a length direction and a width direction which are perpendicular to each other; the N tabs are arranged at intervals along the length direction of the pole piece body, the bottom widths of the N tabs are sequentially decreased progressively and then increased progressively along the length direction of the pole piece body, and the N tabs are overlapped after the pole piece body is wound; n is a positive integer greater than or equal to 3. According to the technical scheme, the tab with the small bottom width can fall in the area of the tab with the large bottom width, even if some deviation exists, the edges of the two sides of the tab with the small bottom width cannot exceed the edge of the tab with the large bottom width, and the tab dislocation phenomenon caused by the size precision of the winding needle and the thickness precision of the pole piece can be counteracted. The N tabs are not in the trend of decreasing in sequence, so that the bottom width value of the tab with the narrowest bottom width is not too narrow, the width of the tabs meets the ultrasonic welding requirement, the welding firmness and the overcurrent capability of the N tabs are ensured, and the yield of the battery is improved.

The collector plate comprises a body, the body is provided with a plurality of welding areas welded with a pole group, the plurality of welding areas are spaced along the circumferential direction of the body, each welding area is provided with a welding printing group, the welding printing group comprises a plurality of welding spots which are sequentially arranged, and the welding printing group is V-shaped or arc-shaped. According to the collector plate disclosed by the utility model, the body of the collector plate is provided with the V-shaped welding printing group, the length of a welding path is increased, the welding area between the collector plate and a pole group is increased, and the connection stability is improved, so that the overcurrent capability and the reliability of a battery are ensured.

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell provided with a pole through hole; the battery cell is arranged in the battery shell; the battery core is electrically connected with the pole assembly, and the pole assembly is fixed on the battery shell by the first bending section and the second bending section; the plugging piece is arranged in the groove, and the plugging piece is connected with the pole assembly in a welding manner, so that a welding mark is formed on one side, deviating from the battery cell, of the plugging piece and / or the pole assembly; at least part of the insulating part is arranged between the pole assembly and the battery shell, the minimum vertical distance between the welding mark and the circumferential outer surface, facing the hole wall of the pole through hole, of the penetrating section is d, and d is larger than or equal to 0, so that the transfer distance of heat on the penetrating section in the welding process can be increased, the probability that the heat is transferred to the insulating part is reduced, and the welding quality of the battery is improved. Therefore, the insulating property and the sealing capability of the insulating part are ensured, and the safe use performance of the battery is improved.

The large cylindrical battery comprises a cylindrical shell, one end of the shell is provided with an opening, a cover plate assembly capable of being welded in a sealed mode is arranged on the opening in a matched mode, the cover plate assembly comprises a disc-shaped cover plate, and the disc-shaped cover plate is provided with a plurality of tabs. The cover plate is conductively connected with a first terminal which is arranged in an outward protruding manner and a through hole which is arranged in a penetrating manner, the through hole is provided with a second terminal which is arranged in an insulating and sealing manner, and a separation area which extends along the radial direction is separated between the first terminal and the second terminal; the second terminal is provided with a welding area which is formed by protruding inwards, and the welding area abuts against the tab of the roll core and is connected with the tab of the roll core in a welding mode. The large cylindrical battery has the advantages that the structure is simple and reasonable, the effective welding area of the shell can be enlarged, and the over-current capability and the heat dissipation capability can be ensured.

The invention relates to the technical field of batteries, and discloses a battery, a battery box and an electric automobile, and the battery comprises a battery cell which comprises a body part and a battery cell output part, and one end, connected with the body part, of the battery cell output part is a root part of the battery cell output part; the electrode terminal assembly is welded with the battery cell output part and forms a first connecting area, and the first connecting area is provided with a first edge close to the body part and a second edge far away from the body part in the first direction; wherein in the state that the battery cell output part is leveled in the first direction, the distance between the root part and the second edge is a, the distance between the root part and the first edge is b, the fault rate of the battery cell output part in the first connection area is c, and b / (a * c) is larger than or equal to 0.003 and smaller than or equal to 0.04. The over-current capability between the electrode terminal assembly and the battery core output part is ensured, the voltage jump of the battery is avoided, the reliability of the battery is ensured, the safety problems of thermal runaway of the battery and the like are avoided, and the safety performance of the battery is ensured.

This utility model proposes a cylindrical secondary battery, including a positive electrode current collector and a negative electrode current collector. The positive electrode current collector includes a disk body and a tail body. The disk body is provided with multiple positive electrode welding areas. The area of ​​the disk body is S1, and the sum of the areas of the multiple positive electrode welding areas is S2. 100 12%S1≤S 100 ≤24%S1; The negative electrode current collector is provided with multiple negative electrode welding areas, and each negative electrode welding area is provided with multiple negative electrode solder marks. The area of ​​the negative electrode current collector is S2, and the sum of the areas of the multiple negative electrode welding areas is S. 200 Among them, 10%S²≤S 200 ≤20%S2. This utility model, by setting a positive electrode welding area and a positive electrode solder mark on the positive electrode current collector, and setting a negative electrode welding area and a negative electrode solder mark on the negative electrode current collector, and by reasonably setting the area of ​​the positive electrode welding area and the negative electrode welding area, can take into account the battery's overcurrent capacity as well as the battery's processing quality and processing efficiency, thereby effectively improving the overall performance of the battery.

This utility model provides a battery, a battery pack, and a battery device. The battery includes a shell, a cover plate, terminals, and an insulating component. The cover plate covers the opening of the shell to form the outer shell of the battery, and has mounting holes. The terminals pass through the mounting holes, with their end faces exposed. The insulating component is located between the outer periphery of the terminals and the inner edge of the mounting holes, providing insulation for the terminals and the cover plate. The end faces form welding positions for busbar welding. Since the minimum distance d1 between the insulating components and the heat deformation temperature k of the insulating components satisfy 300 mm·℃ ≤ d1*k ≤ 1900 mm·℃, the welding position area and weld length can be guaranteed, ensuring the current carrying capacity of the terminals and busbars, while preventing the insulating components from melting under the residual heat of welding, thereby ensuring the insulation performance of the insulating components.

The utility model discloses a cathode current collector plate and a cylindrical battery comprising the cathode current collector plate, the cathode current collector plate comprises: a body, the outer contour of which forms a circle; the welding lug boss protrudes from the main body to one side of the negative collector plate; the welding lug boss is arranged on one side of the negative electrode bus plate, the buffer lug bosses protrude from the body to the side of the negative electrode bus plate, the welding lug boss is arranged in the center of the negative electrode bus plate, and the buffer lug bosses are arranged around the welding lug boss in the circumferential direction at intervals. According to the utility model, the negative electrode confluence plate is beneficial to guaranteeing the welding quality; when the battery falls off or vibrates, the buffering lug boss can play a buffering role; the welding lug boss and the buffer lug boss jointly ensure the overcurrent capacity; and the buffer lug boss is beneficial to welding and positioning.

The utility model provides a collector plate, battery and electronic device relates to battery technical field, collector plate includes: edge fixed part, cover plate connecting part, transition connecting arm and tab connecting part, the cover plate connecting part is located in the middle area of collector plate, the edge fixed part is located the radial outside of cover plate connecting part, and the tab connecting part is located in the middle area of collector plate connecting part. The edge fixing part and the cover plate connecting part are spaced in the radial direction, and the transition connecting arm is connected between the edge fixing part and the cover plate connecting part; the tab connecting part is arranged on one of the edge fixing part and the cover plate connecting part and is separated from the other one, and the tab connecting part and the transition connecting arm are arranged at intervals along the circumferential direction of the cover plate connecting part. According to the collector plate disclosed by the utility model, when the cover plate connecting part and the cover plate protrude outwards due to the increase of internal air pressure of the battery, the pulling force of the collector plate on the tabs can be reduced or even eliminated, the connection stability of the collector plate and an electrode assembly is ensured, and the electrical property of the battery is improved.

The utility model discloses a single battery and a battery pack. Each single battery comprises a battery cell, a cover body assembly and a reinforcing plate; each battery cell comprises a main body and a tab bundle connected with the main body; the cover body assembly comprises a top cover and a pole arranged on the top cover, and the pole is provided with a connecting surface facing the tab bundle; the tab bundle and the connecting surface are welded through ultrasonic waves, and a first welding mark is formed on the surface, back to the connecting surface, of the tab bundle; the reinforcing plate is provided with a hollow part; the reinforcing plate, the tab bundle and the connecting surface are welded through laser, a second welding mark is formed on the surface, back to the tab bundle, of the reinforcing plate, and the orthographic projection of the second welding mark on the connecting surface falls in an area limited by the outer edge of the orthographic projection of the hollow part on the connecting surface. According to the battery, the tab bundle is respectively connected with the pole through the first welding mark and the second welding mark, and through the connecting structure of the reinforcing plate, the overcurrent effect and the structural connection stability of the single battery are effectively ensured.

This invention relates to the field of battery technology and proposes a battery comprising: a battery casing with an electrolyte injection hole; and a battery cell disposed within the battery casing, the battery cell including a cell body and a tab, the tab extending from the side of the cell body, the electrolyte injection hole located on the side of the cell body near the tab, and the electrolyte injection hole being disposed on the surface of the battery casing opposite the large surface of the tab; wherein, in a direction perpendicular to the extension direction of the cell body and the tab, the minimum vertical distance between the electrolyte injection hole and the tab is 'a', the width of the cell body is 'b', and 5 ≤ b / a ≤ 20, which not only avoids the impact of electrolyte injection on the tab but also ensures the width of the tab, thereby ensuring the current carrying capacity of the cell and the charge / discharge rate of the battery, thus improving the battery's performance.

The present invention relates to the field of battery technology, and discloses a battery, the battery comprising: a shell, the shell comprising a pole assembly; a cylindrical core, the cylindrical core comprising a core body and a plurality of pole ears extending from the core body; the pole ears are used to be electrically connected to the pole assembly or the shell; the plurality of pole ears are distributed in multiple layers along the radial direction of the core body; the width of a single pole ear is E, and satisfies: 2mm≤E≤9mm; the difference between the maximum thickness and the minimum thickness of the core body is d, and the number of winding layers of the core body is n, and satisfies: 0.08≤d·n≤0.9. The battery provided by the present invention can ensure the alignment of the pole ears in the radial direction of the battery cell as much as possible by comprehensively controlling the relationship between the difference d between the maximum thickness and the minimum thickness of the core body and the number of winding layers n of the battery cell, effectively reducing the occurrence of pole ear misalignment, making the gap between the front and rear layers after winding more uniform, ensuring the effective welding area, and ensuring the current capacity.

The utility model relates to the technical field of batteries, and provides a battery which comprises a battery cell, and the battery cell comprises a battery cell main body; the tab comprises a plurality of single tab layers, and the plurality of single tab layers comprise a first single tab layer and a second single tab layer; wherein the vertical distance between the connecting end and the free end of the first single tab layer is not greater than the vertical distance between the connecting end and the free end of other single tab layers, and the vertical distance between the connecting end and the free end of the second single tab layer is not less than the vertical distance between the connecting end and the free end of other single tab layers; the vertical distance a between the free end of the first single tab layer and the free end of the second single tab layer is 1mm-10mm, so that the distance between the first single tab layer and the second single tab layer can be prevented from being too large, and the first single tab layer can have a reliable welding area during subsequent tab welding, so that the welding quality of tabs is ensured, and the production efficiency is improved. Therefore, the safe use performance of the battery is ensured.

The utility model discloses a static contact of a molded case circuit breaker, which comprises a static spring terminal, one end of the static spring terminal is provided with a detachable conductive block, the conductive block is provided with a static contact, one end of the static spring terminal is provided with a detachable heat dissipation block, and the side surface of the heat dissipation block is provided with a plurality of heat dissipation grooves. The temperature rise of the static spring terminal is controlled through the heat dissipation block, the overcurrent capability is improved through the conductive block, the heat exchange efficiency with air is improved, and the static spring terminal is made of a copper-clad aluminum material, so that the manufacturing cost is reduced, and the product has the advantages of improving the heat dissipation effect, reducing the manufacturing cost, being convenient to maintain and the like.

The utility model provides a battery and a connecting piece thereof. The connecting sheet is used for being electrically connected to the pole and the roll core and is provided with a first surface and a second surface which are opposite; wherein the first surface is provided with a sinking table groove, the sinking table groove is used for accommodating the pole so that the pole can be welded to the connecting piece through the sinking table groove, and the second surface is provided with an anti-reflection groove corresponding to the sinking table groove. The first surface of the connecting piece is provided with the sinking table groove, so that the thickness of a partial area of the connecting piece is reduced, the maximum thickness of the connecting piece is not changed, and therefore the thickness of the part, needing to be welded through, of the laser on the connecting piece is reduced while the original overcurrent capacity of the connecting piece is guaranteed; meanwhile, reflection of laser on the second surface is reduced by forming the anti-reflection grooves in the second surface, the connecting piece can absorb laser energy easily, and the technical problem that the penetration welding difficulty of the thickened connecting piece is large is comprehensively solved. And the energy cost is saved, the cold solder joint risk is reduced, and the production yield is improved.

The utility model relates to the technical field of secondary batteries, and discloses a battery cell cover plate, which comprises a cover plate body provided with a first through hole; the connecting block is arranged above the cover plate body, and a second through hole is formed in the connecting block; the polar column penetrates through the first through hole and the second through hole, the polar column comprises a connecting part and a first column body, the first column body is connected with the connecting part and arranged below the connecting part, the edge of the connecting part extends out of the edge of the first column body, and the edge of the first column body extends out of the edge of the first column body. And the size e from the edge of the first column body to the edge of the connecting part is greater than or equal to 0.5 mm. According to the battery cell cover plate, the size from the edge of the first column body to the edge of the connecting part is limited, so that the edge lapping requirement of the pole and the connecting block is ensured, the force bearing requirement of the pole is met, the performance of the battery cell cover plate is improved, the rejection rate is reduced, and the safety of the battery cell is improved.

The utility model relates to a cylindrical battery cathode collector plate welding structure and a cylindrical secondary battery. Relates to the technical field of new energy batteries. The battery comprises a cathode collector plate and a welding mark arranged on the cathode collector plate, the cathode collector plate is used for connecting the cathode of the roll core with the bottom of a battery shell, and the welding mark is used for connecting the cathode collector plate with the cathode of the roll core; and the ratio L0 / R0 of the length L0 of the welding mark to the radius R0 of the negative collector plate is 37%-57%. According to the cylindrical secondary battery, the ratio L0 / R0 of the length L0 of the welding mark to the radius R0 of the negative collector plate is set between 37% and 57%, and the length L0 of the welding mark is prevented from being too large or too small, so that the overcurrent capacity of the welding mark can be ensured, the welding reject ratio can be reduced, the welding reliability is enhanced, and the performance of the cylindrical secondary battery is further ensured.

The present invention relates to the field of battery technology, and specifically to a battery, comprising: a shell and a cylindrical winding core, the shell comprising a pole assembly, the cylindrical winding core comprising a winding core hole; the cylindrical winding core comprising a pole piece; the pole piece comprising a pole piece body and a plurality of pole ears; the pole ears are used to be electrically connected to the pole assembly and / or the shell; the pole piece comprises a winding head end, the pole ears comprise a first pole ear, in the length direction after the pole piece is unfolded, the distance between the first pole ear and the winding head end is D1, the area of ​​the winding core hole is S, and the range of D1 / S is between 3 and 45. The embodiment of the present invention can comprehensively adjust the spacing and the area of ​​the winding core hole to avoid covering the position of the winding core hole after the pole ear is folded, thereby not affecting the injection. When the injection hole and the pole ear are on the same side, the pole ear is prevented from blocking and directly affecting the injection of electrolyte into the winding core hole; when the injection hole and the pole ear are not set at the same end, the pole ear is prevented from blocking the winding core hole and affecting the electrolyte in the winding core from infiltrating the battery cell.

This application discloses a battery that reduces the problem of poor soldering between the adapter and the terminal caused by inserting the tab between the terminal and the adapter piece, and also reduces the situation where the adapter piece melts and fails due to overlap between the tab and the terminal. The battery includes: a casing, terminals, a cell, an adapter piece, and an insulating component. The casing has a first wall; the terminal is mounted on the first wall; the cell is disposed in the casing, and the cell includes a cell body and a tab, the tab including a connecting portion; the adapter piece is connected to the end of the terminal facing the cell and is located between the first wall and the cell body; the connecting portion is located on the side of the adapter piece away from the cell body and is located on the periphery of the terminal, the connecting portion being electrically connected to the adapter piece; the insulating component is disposed between the first wall and the adapter piece, and the insulating component has a groove for accommodating the connecting portion.

The present invention relates to the technical field of batteries, and discloses a battery, which comprises: a shell, which comprises a pole assembly; the cylindrical roll core comprises a roll core body and a plurality of tabs led out from the roll core body; the tab is used for being electrically connected with a pole assembly or a shell; the plurality of tabs are distributed in multiple layers in the radial direction of the roll core body; the width E of a single tab is greater than or equal to 2mm and less than or equal to 9mm; the difference value between the maximum thickness and the minimum thickness of the roll core body is d, the number of winding layers of the roll core body is n, and d * n is larger than or equal to 0.08 and smaller than or equal to 0.9. According to the battery provided by the invention, by comprehensively controlling the relationship between the difference value d of the maximum thickness and the minimum thickness of the roll core body and the number n of winding layers of the battery core, the tab alignment degree in the radial direction of the battery core can be ensured as much as possible, the tab dislocation condition is effectively reduced, the gap between the front layer and the rear layer after winding is relatively uniform, and the effective welding area is ensured; and the overcurrent capability is ensured.

The utility model relates to the technical field of batteries, and provides a battery shell assembly and a battery. The battery shell assembly comprises a battery shell and a pole structure, the pole structure is arranged on the battery shell, the pole structure comprises a main body, a groove is formed in the main body, the groove is provided with an open end face, the area of the open end face is S1, the area of a connecting end face, deviating from the groove, of the main body is S2, the depth of the groove is h1, the distance between the bottom wall of the groove and the connecting end face is h2, 0.02 < = (S1 * h1) / (S2 * h2) < = 30, therefore, the manufacturing cost of the main body can be effectively controlled, the main body can have certain structural strength, the overall overcurrent capability can be ensured, the risk of deformation of the battery shell caused by overhigh strength cannot be increased, and the use performance of the pole structure is reliably improved.

The application relates to the field of batteries and battery packs. The battery comprises a shell, a battery cell arranged in the shell, and a cover plate assembly arranged at an opening of the shell; the cover plate assembly comprises a cover plate body and a pole post, and a tab of the battery cell is electrically connected to the pole post; the cover plate body is provided with a pole post hole; the pole post is arranged in the pole post hole and connected to the cover plate body; the pole post is provided with a first surface, the first surface is used for electrical connection with a bus bar, the area of the first surface is s, the vertical distance between the first surface and the outer surface of the cover plate body is h, and s / h satisfies 5-500. The size of the pole post is controlled to effectively balance the heat generation and the connection strength of the pole post.

The invention relates to the technical field of new energy, in particular to a CCS assembly and a battery pack with the same. The CCS assembly comprises a signal acquisition terminal used for acquiring voltage signals and temperature signals of single batteries in a battery pack; and a flexible flat cable including a first flat wire and a second flat wire spaced apart from each other in a width direction of the flexible flat cable, in which the first flat wire is connected to the signal acquisition terminal for leading out the voltage signal and supplying an equalizing current to the battery cells via the signal acquisition terminal, and the second flat wire is connected to the signal acquisition terminal for supplying an equalizing current to the battery cells via the signal acquisition terminal. The second flat wire is connected to the signal acquisition terminal and is used for leading out the temperature signal; wherein the width of the second flat wire is smaller than that of the first flat wire.

The utility model provides a kind of battery, battery pack and battery device, it is related to battery structure technical field, battery includes shell, shell has accommodating cavity, shell has opening in one end;Cover plate, cover plate is used to cover opening, and mounting hole is opened in cover plate;Pole, the first end of pole is worn in mounting hole;Insulating component, insulating component is located between the outer periphery of pole and the inner edge of mounting hole;And busbar, busbar is welded with the first surface of pole;The material quality that busbar adopts includes first metal and first alloy element doped in first metal, the melting point of first alloy element is higher than the melting point of first metal;The welding area between busbar and the first surface of pole on the first surface of pole is ratio a, and the content ratio b of first alloy element in busbar, between both satisfy: 0.00001≤a*b≤0.05.The utility model can solve the problem of melting insulating component when busbar is welded.

The application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power utilization device. The application provides a battery monomer, which comprises a battery cell and insulating glue. The battery cell comprises a battery cell body and a tab part. The tab part has an adhesive surface. The adhesive surface has a connecting area and a welding mark area. The connecting area connects the battery cell body and the welding mark area. The insulating glue comprises a first part, a second part and a third part which are sequentially connected. The adhesion of the second part is smaller than that of the first part, and the adhesion of the second part is smaller than that of the third part. The first part is bonded to the battery cell body, the third part is bonded to the welding mark area, and the second part covers the connecting area. The application can reduce the tearing of the tab part caused by the pulling of the insulating glue.

The invention relates to the technical field of batteries, in particular to a battery which comprises a shell and a cylindrical roll core, the shell comprises a pole assembly, and the cylindrical roll core comprises a roll core hole; the cylindrical roll core comprises a pole piece; the pole piece comprises a pole piece body and a plurality of tabs; the tab is used for being electrically connected with the pole assembly and / or the shell; the pole piece comprises a winding head end, the pole lug comprises a first pole lug, in the length direction of the unfolded pole piece, the distance between the first pole lug and the winding head end is D1, the area of a winding core hole is S, and the range of D1 / S is between 3 and 45. According to the embodiment of the invention, the spacing and the area of the roll core hole can be comprehensively adjusted, the position of the roll core hole is prevented from being covered after the tab is turned over, and liquid injection is not influenced. When the liquid injection holes and the tabs are on the same side, the situation that the electrolyte is injected into the roll core holes directly affected by shielding of the tabs is avoided; and when the liquid injection hole and the tab are not arranged at the same end, the condition that the battery cell is infiltrated by the electrolyte in the roll core hole after the roll core hole is shielded by the tab is avoided.