A battery electrode core, a battery and a manufacturing method thereof

Abstract

The present invention is applicable to the field of batteries, and provides a battery electrode core, a battery and a manufacturing method of the battery electrode core. The battery electrode core includes a wound core part and an electrode tab part. The electrode tab part is integrally connected to the wound core part and protrudes from the end of the wound core part. The wound core part includes wound electrode sheets, and the electrode tab part includes at least two electrode tabs that are integrally connected to the same electrode sheet and are stacked when the electrode sheet is wound. The battery electrode core further includes a spacer disposed at the end of the wound core part, and the spacer is provided with a perforation for the electrode tab part to pass through. The battery has the above-mentioned battery electrode core. The battery electrode core, the battery and the manufacturing method of the battery electrode core provided by the present invention have good current conduction stability and uniform current conduction in the electrode tab part, can reduce the risk of liquid overflow, improve the liquid injection efficiency, can maximize the effective utilization space of the electrode core, and is beneficial to increasing the battery capacity.

Description

Technical Field

[0001] The present invention belongs to the field of power batteries, and particularly relates to a battery electrode core, a battery, and a manufacturing method of the battery electrode core. Background Art

[0002] At present, for the treatment methods of the positive and negative electrode tabs in cylindrical batteries, the following two technical solutions are mainly adopted in the prior art:

[0003] The first one: There is no ear and current collector disk in the traditional sense. The battery electrode core has no exposed ear. The lead piece is connected to the electrode sheet, and the lead piece extends out of the core and is connected to the connection piece by welding. The connection piece is connected to the cap or pole column by welding to complete the electrical connection loop. The lead piece replaces the ear and current collector disk, and the lead piece is connected to the connection piece; the lead piece is made of metal, and can be a material with low impedance such as nickel or copper. Limited by the size and connection method of the lead piece, and the single-layer electrode sheet is too thin and soft to be welded, the lead piece and the electrode sheet cannot be connected by mechanical methods such as welding. Generally, the lead piece is fixedly connected to the ear with tape, and the size of the lead piece needs to be as small and thin as possible to avoid tearing or piercing the electrode sheet due to the size and weight of the lead piece, resulting in battery failure; limited by the thickness of the electrode sheet, the connection method between the lead piece and the electrode sheet, and the size of the lead piece, the current-carrying capacity of this solution is limited and can only be used for small batteries, unable to meet the current-carrying requirements of large batteries. Moreover, fixing the lead piece to the ear with tape results in poor conduction stability and uneven current conduction. The current is only conducted through the area where the lead piece is located, causing excessive local heating. When the current exceeds a certain range, there is a risk of thermal runaway and it cannot be applied to large batteries.

[0004] The second one: Adopt the method of connecting the current collector disk after flattening the ear. The exposed positive and negative electrode ears of the core are flattened and compacted by equipment. After flattening, there are tiny pores inside the ear and they are not fused into a whole; the welding method of this solution is "thick penetrating thin", with high welding process difficulty and high welding precision requirements. It is easy to weld through the ear during welding, causing a short circuit of the core and low production efficiency, and the production yield is unstable; after the ear is flattened and compacted, it covers the upper and lower surfaces of the core. The density of the ear is high and the pores inside the ear are tiny, making it impossible to penetrate the electrolyte; except for the central through-hole in the flattening process, there are no other pores for the electrolyte to penetrate. The structure of this solution is not conducive to the injection, penetration, and infiltration of the electrolyte, affecting the injection efficiency and success rate; and the injection efficiency will affect the production rhythm of the battery and reduce the production efficiency of the battery production line. The problems are more prominent when using this solution for large batteries; to meet the welding requirements and not weld through the ear, the ear needs to have a certain height and density after flattening, occupying a large space in the Z direction (height direction), with low space utilization rate of the battery electrode core, which is not conducive to increasing the capacity of the battery; placing the current collector disk on the flattened ear and connecting it by welding. After the ear is flattened, the density is high, and except for the flattening process hole, there are no other pores for the electrolyte to penetrate, making it difficult to inject the electrolyte, affecting the subsequent penetration and infiltration of the electrolyte, resulting in low injection efficiency and high probability of overflow. Summary of the Invention

[0005] The object of the present invention is to overcome at least one of the above-mentioned deficiencies in the prior art, and provides a battery electrode core, a battery and a manufacturing method of the battery electrode core, which can effectively reduce the welding difficulty between the tab and the current collector plate, improve the welding success rate and efficiency, facilitate eliminating the overcurrent limitation of the tab, and can increase the effective utilization space of the electrode core to facilitate increasing the battery capacity.

[0006] The technical solution of the present invention is: a battery electrode core, comprising a wound core part and a tab part, the tab part is integrally connected to the wound core part and protrudes from the end of the wound core part; the wound core part comprises wound electrode sheets, and the tab part comprises at least two tabs integrally connected to the same electrode sheet and laminated when the electrode sheet is wound.

[0007] The battery electrode core further comprises a spacer ring arranged at the end of the wound core part, and the spacer ring is provided with a perforation for the tab part to pass through.

[0008] Optionally, the wound core part winds multiple layers of electrode sheets from the center, and the tabs are arranged starting from the electrode sheet after a set number of turns from the center of the wound core part.

[0009] Optionally, after the electrode sheet winds a set number of turns from the center, the tabs are continuously laminated starting from the set number of turns.

[0010] Optionally, starting from the electrode sheet after the set number of turns, the height of the tabs on the outer electrode sheet is greater than the height of the tabs on the inner electrode sheet.

[0011] Optionally, the tabs are die-cut on the side of the electrode sheet.

[0012] Optionally, the electrode core assembly further comprises a current collector plate, the current collector plate is arranged on the spacer ring, and the tabs pass through the perforation and are connected to the current collector plate.

[0013] Optionally, the tabs are pre-welded with tab protection sheets, and the tab protection sheets or / and the tabs are laser-welded to the current collector plate.

[0014] Optionally, the electrode sheet comprises a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are separated by a separator; the tab part comprises at least one group of positive electrode tabs and at least one group of negative electrode tabs, the positive electrode tabs comprise positive electrode tabs integrally connected to the positive electrode sheet and protruding from one end of the wound core part, and the negative electrode tabs comprise negative electrode tabs integrally connected to the negative electrode sheet and protruding from the other end of the wound core part.

[0015] Optionally, there are at least two groups of positive electrode tabs, and each group of positive electrode tabs is evenly spaced in the circumferential direction;

[0016] There are at least two groups of the negative electrode tab portions, and the negative electrode tabs of each group are evenly spaced along the circumferential direction.

[0017] The present invention also provides a battery, including a cap assembly and the above-mentioned battery core, and the cap assembly is connected to the end of the battery core.

[0018] Optionally, the cap assembly includes a cap sheet and an explosion-proof valve. The cap sheet is provided with an explosion-proof valve mounting hole, the explosion-proof valve is disposed at the explosion-proof valve mounting hole, and an explosion-proof valve protective film is provided on the explosion-proof valve; a sealing ring is connected to the edge of the cap sheet.

[0019] Optionally, the current collector plate of the battery core is welded to the cap assembly through a current collector plate connecting piece.

[0020] Optionally, the battery is a cylindrical battery.

[0021] The present invention also provides a manufacturing method of a battery core for manufacturing the above-mentioned battery core, including the following steps:

[0022] Prepare a pole piece and a spacer with perforations. The pole piece has at least two tabs integrally connected to the same pole piece and laminated to form tab portions when the pole piece is wound.

[0023] Wind the pole piece to form a wound core portion. During the process of winding the pole piece to form the wound core portion, the tabs are laminated to form tab portions.

[0024] Connect the spacer to the end of the wound core portion and pass the tab portions through the perforations.

[0025] For the battery core, battery and manufacturing method of the battery core provided by the present invention, at least two pole pieces can be laminated to form tab portions along with the winding of the pole piece. The tab portions include at least two layers of tabs integrally formed on the pole piece. The current conduction stability of the tab portions is good and the current conduction is uniform. This setting method of the tabs can effectively reduce the welding difficulty between the tabs and the current collector plate, improve the welding success rate and efficiency, and can reserve a large number of non-filled areas for electrolyte injection, penetration and infiltration; this non-filled area is beneficial to the rapid injection, penetration and infiltration of the electrolyte, reduces the risk of overflow, improves the injection efficiency. By adjusting the number, size, shape and length of the tabs, batteries with different capacities and overcurrent requirements can be adapted, especially suitable for large-capacity cylindrical batteries, which is beneficial to eliminating the overcurrent limitation of the tabs; and the Z-direction occupied space of the tabs is small, which can maximize the effective utilization space of the core and is beneficial to increasing the battery capacity. Description of the Drawings

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the accompanying drawings required for use in the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0027] Figure 1 is a three-dimensional schematic diagram of a winding core part and an electrode tab part in a battery electrode core provided by an embodiment of the present invention;

[0028] Figure 2 is a three-dimensional schematic diagram of a battery electrode core provided by an embodiment of the present invention;

[0029] Figure 3 is an assembly schematic diagram of a battery electrode core equipped with a spacer and a current collector plate;

[0030] Figure 4 is a partial exploded schematic diagram of a battery provided by an embodiment of the present invention;

[0031] Figure 5 is a cross-sectional schematic diagram of a battery (with the electrode tab passing through the inside of the current collector plate) provided by an embodiment of the present invention;

[0032] Figure 6 is Figure 5 a plan view of a battery in

[0033] Figure 7 is a cross-sectional schematic diagram of a battery (with the electrode tab passing through the outside of the current collector plate) provided by an embodiment of the present invention;

[0034] Figure 8 is Figure 7 a plan view of a battery in

[0035] Figure 9 is a cross-sectional schematic diagram of a battery (with the electrode tabs passing through the inside and outside of the current collector plate respectively) provided by an embodiment of the present invention;

[0036] Figure 10 is Figure 9 a plan view of a battery in Specific Embodiments

[0037] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the following further details the present invention in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a direct arrangement or connection, or an indirect arrangement or connection through an intermediate component or structure.

[0039] In addition, in the embodiments of the present invention, if there are terms indicating the orientation or positional relationship such as "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., they are based on the orientation or positional relationship shown in the drawings or the conventional placement state or use state. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure, feature, device or element referred to must have a specific orientation or positional relationship, nor must it be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] In the specific technical features and each embodiment described in the specific implementation manners, they can be combined in any suitable manner without contradiction. For example, different specific implementation manners can be formed by combining different specific technical features / embodiments. To avoid unnecessary repetition, various possible combination manners of the specific technical features / embodiments in the present invention will not be described separately.

[0041] Such as Figures 1 to 5As shown in the figure, a battery electrode core provided by an embodiment of the present invention includes a wound core part 1 and an electrode tab part 2. The electrode tab part 2 is integrally connected to the wound core part 1 and protrudes from the end of the wound core part 1. The wound core part 1 includes wound electrode sheets. The battery electrode core further includes a spacer 5 provided at the end of the wound core part 1. The spacer 5 is provided with a through hole 51 for the electrode tab part 2 to pass through. The electrode tab part 2 includes at least two electrode tabs integrally connected to the same electrode sheet and stacked when the electrode sheet is wound, that is, at least two electrode tabs can be stacked to form the electrode tab part 2 when the electrode sheet is wound. The number of layers of the electrode tabs can be set according to actual situations, which can ensure the current conduction stability and uniformity of the electrode tab part 2. In this setting method of the electrode tabs, it is not easy to weld through the electrode tabs during welding, which can effectively reduce the welding difficulty between the electrode tabs and the current collector plate, improve the welding success rate and efficiency, and a large amount of non-filled area 3 can be reserved for electrolyte injection, penetration, and infiltration. This non-filled area 3 is beneficial to the rapid injection, penetration, and infiltration of the electrolyte, reduces the risk of overflow, improves the injection efficiency, and the improvement of the injection efficiency is conducive to ensuring the production rhythm of the battery and improving the production efficiency of the battery production line. By adjusting the number, size, shape, and length of the electrode tabs, batteries with different capacities and overcurrent requirements can be adapted, especially suitable for large-capacity cylindrical batteries, which is beneficial to eliminating the overcurrent limitation of the electrode tabs. Moreover, the Z-direction occupied space of the die-cut electrode tabs is small, which can greatly increase the effective utilization space of the electrode core and is beneficial to increasing the battery capacity.

[0042] Specifically, the wound core part 1 is wound with multiple turns of electrode sheets starting from the center. The electrode tabs are provided on the electrode sheets after a set number of turns starting from the center of the wound core part 1, that is, the electrode tabs can be far from the center of the battery electrode core (wound core part 1), with high reliability and convenient assembly. In this embodiment, the distance between the electrode tab and the center of the wound core part 1 is greater than the distance between the electrode tab and the outer peripheral side of the wound core part 1, that is, the electrode tab part 2 is closer to the outer periphery of the wound core part 1. Of course, the distance between the electrode tab and the center of the wound core part 1 can also be less than or equal to the distance between the electrode tab and the outer peripheral side of the wound core part 1.

[0043] In specific applications, the electrode sheets can be polygonal, semi-circular, semi-annular, etc., such as rectangular, trapezoidal, triangular, etc.

[0044] Specifically, after the electrode sheet is wound a set number of turns starting from the center, the electrode tabs are continuously stacked starting from the set number of turns, and the number of continuous stacking layers can be set according to actual situations, that is, the number of electrode sheets included in each electrode tab part can be set according to actual situations. Of course, after the set number of turns, the electrode tabs can also be provided at intervals of one or two turns, as long as the adjacent electrode tabs can be stacked to form the electrode tab part 2.

[0045] Specifically, starting from the electrode sheet after the set number of turns, the height of the electrode tabs on the outer ring electrode sheet is greater than the height of the electrode tabs on the inner ring electrode sheet, which is beneficial to improving the diversion effect.

[0046] Specifically, the tab is formed on the side of the electrode plate by die cutting, which has high production efficiency. Of course, the tab can also be formed on the electrode plate by means of laser cutting or the like.

[0047] Specifically, the electrode core assembly further includes a current collector plate 4, the current collector plate 4 is disposed on the spacer ring 5, and the tab passes through the through hole 51 and is electrically connected to the current collector plate 4 to facilitate subsequent assembly.

[0048] Specifically, the tab can be pre-welded with a tab protection sheet by ultrasonic welding, and the tab protection sheet or / and the tab are laser welded to the current collector plate 4, with higher reliability.

[0049] Specifically, the electrode plate includes a positive electrode plate and a negative electrode plate, and the positive electrode plate and the negative electrode plate are separated by a separator. The positive electrode plate, the negative electrode plate, and the separator are wound together to form an electrode core; the tab portion 2 includes at least one group of positive electrode tabs and at least one group of negative electrode tabs. The positive electrode tab includes a positive electrode tab integrally connected to the positive electrode plate and protruding from one end of the core portion 1, and the negative electrode tab includes a negative electrode tab integrally connected to the negative electrode plate and protruding from the other end of the core portion 1. The tab includes the positive electrode tab and the negative electrode tab. In this embodiment, both the positive electrode tab and the negative electrode tab are integrally formed by die cutting.

[0050] In specific applications, the number of turns of the tab provided on the electrode core, as well as the lead-out positions of the positive electrode tab and the negative electrode tab, can be adjusted according to the number of layers of the electrode core (the number of turns of the electrode plate winding) and the battery capacity; the number of tabs of the positive electrode and the negative electrode can be any natural number greater than 1, the tabs of the positive electrode and the negative electrode can be of any shape, and the cutting method is not limited. After the tab is die cut, there is enough space for the electrolyte to penetrate and soak, which is beneficial to effectively improve the injection efficiency and reduce the probability of overflow, providing a feasibility for adding an injection hole to the cylindrical battery and converting from open-circuit formation to closed-circuit formation; moreover, the number, shape of the tab, and the tab can be controlled to start leading out from the core portion 1 at a set number of turns according to the designed battery capacity, overcurrent requirement, etc., with the advantages of flexible operation and high controllability, which can meet the capacity and overcurrent requirements of various types of batteries, and the tab occupies a small space in the Z direction (the battery height direction), which can greatly increase the effective utilization space of the electrode core, facilitating an increase in the battery capacity. Moreover, the tab can be placed above the current collector plate 4, and the welding method is "thin penetrating thick", avoiding welding through the tab during welding, thereby preventing the phenomenon of battery short circuit caused thereby, and the production yield is high.

[0051] Specifically, there are at least two groups of positive electrode tabs provided, and each group of the positive electrode tabs is evenly spaced along the circumference; in this embodiment, four groups of positive electrode tabs are provided, and the four groups of positive electrode tabs are evenly distributed at intervals of 90 degrees along the circumference, that is, starting from the set number of turns, each turn of the electrode plate has four positive electrode tabs.

[0052] Specifically, there are at least two groups of negative electrode tab portions. Each group of the negative electrode tabs is evenly spaced in the circumferential direction. In this embodiment, there are four groups of negative electrode tabs, and the four groups of negative electrode tabs are evenly distributed at intervals of 90 degrees in the circumferential direction, that is, starting from the set number of turns, each turn of the electrode sheet has four negative electrode tabs.

[0053] In specific applications, the number of positive electrode tabs and negative electrode tabs can be the same, and their shapes and quantities can also be the same. The shapes of the positive electrode sheet and the negative electrode sheet can be the same, with good compatibility, which is beneficial to reducing the number of molds.

[0054] The embodiment of the present invention also provides a battery, including a cap assembly and the above-mentioned battery electrode core. The cap assembly is connected to the end of the battery electrode core. The tabs are wound with the electrode sheets to form an electrode tab portion 2 stacked by multiple tabs, which can effectively reduce the welding difficulty between the electrode tab portion 2 and the current collector plate 4, and is beneficial to improving the welding success rate and efficiency.

[0055] Specifically, the cap assembly includes a cap sheet 7 and an explosion-proof valve 9. The cap sheet 7 is provided with an explosion-proof valve mounting hole 71, and the explosion-proof valve 9 is disposed at the explosion-proof valve mounting hole 71. An explosion-proof valve protective film 10 is provided on the explosion-proof valve 9; a sealing ring 6 is connected to the edge of the cap sheet 7.

[0056] In specific applications, both ends of the battery can have a cap assembly, that is, a positive electrode cap assembly and a negative electrode cap assembly are respectively provided at both ends of the battery electrode core. In specific applications, the explosion-proof valve 9 and the explosion-proof valve protective film 10 can be provided only in the positive electrode cap assembly.

[0057] Specifically, the current collector plate 4 of the battery electrode core is welded to the cap assembly through a current collector plate connecting piece 8, and the current collector plate connecting piece 8 can be welded to the cap sheet 7.

[0058] Specifically, the battery can be a cylindrical battery, such as 18650 lithium battery, 21700 lithium battery or 4680 lithium battery, etc.

[0059] In specific applications, the tabs at both ends of the core component are the positive tab and the negative tab respectively. Two spacers 5 can be provided and placed on the surfaces at both ends of the core component respectively. The spacer 5 is in close contact with the separator of the battery core. The current collector plate 4 is placed on the spacer 5. The spacer 5 is a non-metallic insulating part and plays an insulating role. The size and shape of the current collector plate 4 depend on the shape and number of the tabs. The surface of the spacer 5 can be provided with positioning grooves, and the current collector plate 4 can be limited by the positioning grooves. The current collector plate 4 includes a positive current collector plate and a negative current collector plate. The positive current collector plate can be made of aluminum or aluminum alloy, and the negative current collector plate can be made of copper, copper alloy, nickel, nickel alloy, or steel. One side of the current collector plate 4 is attached to the spacer 5, and the tab passes through the perforation 51 of the spacer 5 and is placed on the other side of the current collector plate 4. The tab is connected to the current collector plate 4 by welding, and the welding method can be any welding method such as FTT welding (arc extinguishing and molten ball welding), spot welding, or ultrasonic welding. The current collector plate 4 can be in the shape of a disc or a ring. The number, size, shape, and length of the tabs depend on the battery with different capacities. The size and shape of the current collector plate 4 depend on the battery with different capacities. The current collector plate 4 is welded to the cap assembly through the current collector plate connecting piece 8. The cap plate 7 is divided into a positive cap plate and a negative cap plate. The positive cap plate can be made of aluminum or aluminum alloy, and the negative cap plate can be made of copper, copper alloy, nickel, nickel alloy, or steel. A sealing ring 6 is assembled around the cap assembly. The sealing ring 6 is a non-metallic elastomer and plays an insulating and sealing role.

[0060] In this embodiment, the tabs are formed by die-cutting, and a large number of non-filled areas 3 can be reserved for the injection, penetration, and infiltration of the electrolyte. The non-filled areas 3 are beneficial to the rapid injection, penetration, and infiltration of the electrolyte, reduce the risk of liquid overflow, and improve the injection efficiency.

[0061] Moreover, by adjusting the number, size, shape, and length of the positive tab and the negative tab, batteries with different capacities and overcurrent requirements can be adapted, especially for large-capacity cylindrical batteries, which is beneficial to eliminating the overcurrent limitation of the tabs. And the Z-direction occupied space of the die-cut tabs is small, which can maximize the effective utilization space of the core and is beneficial to increasing the battery capacity.

[0062] Such as Figure 5 、 6 As shown, 4 groups of tab parts 2 are provided at each end of the battery core, and the tab parts 2 can pass through the inside of the current collector plate 4 and be attached to the current collector plate 4. As Figure 7 、 Figure 8 As shown, 4 groups of tab parts 2 are provided at each end of the battery core, and the tab parts 2 can pass through the outside of the current collector plate 4 and be attached to the current collector plate 4.

[0063] In specific applications, such as Figure 9 、 Figure 10As shown, there are 4 sets of tab portions 2 provided at each end of the battery electrode core. Each spacer 5 corresponding to one tab portion 2 can be provided with two corresponding through holes 51. The current collector plate 4 can be annular and located between the two through holes 51. In this way, a part of the electrode tabs in each tab portion 2 passes through one of the corresponding through holes and is connected to the surface of the current collector plate 4 through the inner side of the current collector plate 4, and another part of the electrode tabs passes through the other corresponding through hole and is connected to the surface of the current collector plate 4 through the outer side of the current collector plate 4. That is, each tab portion 2 can be divided into two and connected to the current collector plate 4 from two directions, and its current-carrying capacity is better. The tab portion 2 can include a through-hole portion 21 passing through the through hole 51 and a welding portion 22 attached to the surface of the current collector plate 4.

[0064] An embodiment of the present invention further provides a manufacturing method of a battery electrode core for manufacturing the battery electrode core or battery as described above, including the following steps:

[0065] Prepare electrode tabs and spacers 5 with through holes 51. The spacers 5 can be made of insulating materials, such as plastics or ceramics, etc. The electrode tabs have at least two electrode ears integrally connected to the same electrode tab and stacked when the electrode tab is wound to form a tab portion 2.

[0066] Wind the electrode tab to form a core portion 1. During the process of winding the electrode tab to form the core portion 1, the electrode ears are stacked to form a tab portion 2. That is, at least two electrode ears are pre-formed on the side of the electrode tab, and the electrode ears are arranged at a predetermined interval. During the process of winding the electrode tab to form the core portion 1, starting from a set number of turns, the electrode ears start to appear on the core portion 1, and the electrode ears that appear continuously for multiple turns can be stacked to form a tab portion 2.

[0067] Connect the spacer 5 to the end of the core portion 1 and make the tab portion 2 pass through the through hole 51. The tab portion 2 passing through the through hole 51 can be connected to the current collector plate 4, that is, the electrode ear is placed on the upper surface of the current collector plate 4 after extending out of the through hole 51 of the current collector plate 4.

[0068] In specific applications, the electrode ears do not overlap at the center of the circle, and it is not necessary to weld the electrode ears together. An electrode ear protection sheet can be added to the electrode ear for ultrasonic pre-welding and then laser-welded to the current collector plate 4.

[0069] A battery electrode core, a battery and a manufacturing method of the battery electrode core provided by an embodiment of the present invention. At least two electrode plates can be laminated to form an ear part 2 as the electrode plates are wound. The ear part 2 includes at least two layers of ears integrally formed on the electrode plate. The ear part 2 has good current conduction stability and uniform current conduction. This setting mode of the ear part 2 can effectively reduce the welding difficulty between the ear and the current collector plate, improve the welding success rate and efficiency, and a large number of non-filled areas 3 can be reserved for electrolyte injection, penetration and infiltration. This non-filled area 3 is beneficial to the rapid injection, penetration and infiltration of the electrolyte, reduces the risk of liquid overflow, and improves the injection efficiency. By adjusting the number, size, shape and length of the ears, batteries with different capacities and overcurrent requirements can be adapted, especially suitable for large-capacity cylindrical batteries, which helps to eliminate the overcurrent limitation of the ears. Moreover, the Z-direction occupied space of the die-cut ear is small, which can maximize the effective utilization space of the electrode core and is beneficial to increasing the battery capacity.

[0070] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery electrode core, characterized in that, It includes a core part and tab parts. The tab parts are integrally connected to the core part and protrude from the end of the core part. The core part includes wound electrode sheets, and the tab parts include at least two tabs that are integrally connected to the same electrode sheet and are stacked when the electrode sheet is wound. The battery electrode core further includes a spacer disposed at the end of the core part. The spacer is provided with a perforation for the tab parts to pass through. Starting from the electrode sheet after a set number of turns, the height of the tabs on the outer ring electrode sheet is greater than the height of the tabs on the inner ring electrode sheet. The electrode core assembly further includes a current collector plate. The current collector plate is disposed on the spacer. The tab parts pass through the perforation and are connected to the current collector plate, and the tab parts are placed on the surface of the current collector plate facing away from the spacer. The electrode sheet includes a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet are separated by a separator. The tab parts include at least one group of positive tab parts and at least one group of negative tab parts. The positive tab parts include positive tabs that are integrally connected to the positive electrode sheet and protrude from one end of the core part. The negative tab parts include negative tabs that are integrally connected to the negative electrode sheet and protrude from the other end of the core part. There are at least two groups of the positive tab parts, and each group of the positive tabs is evenly spaced along the circumferential direction. There are at least two groups of the negative tab parts, and each group of the negative tabs is evenly spaced along the circumferential direction. A current collector plate connection piece for connecting to the cap assembly is disposed on the surface of the current collector plate facing away from the spacer.

2. The battery electrode core according to claim 1, characterized in that, The core part is wound with multiple turns of electrode sheets starting from the center, and the tabs are provided starting from the electrode sheet after a set number of turns from the center of the core part.

3. A battery electrode core according to claim 2, characterized in that, After the electrode sheet is wound a set number of turns from the center, the tabs are continuously stacked starting from the set number of turns.

4. A battery electrode core as claimed in claim 1, wherein, The tabs are die-cut on the side of the electrode sheet.

5. A battery electrode core as described in claim 1, characterized in that, The tabs are pre-welded with tab protection sheets, and the tab protection sheets or / and the tabs are laser-welded to the current collector plate.

6. A battery, characterized in that, It includes a cap assembly and a battery electrode core as described in any one of claims 1 to 5. The cap assembly is connected to the end of the battery electrode core.

7. A battery according to claim 6, characterized in that, The cap assembly includes a cap sheet and an explosion-proof valve. The cap sheet is provided with an explosion-proof valve mounting hole. The explosion-proof valve is disposed at the explosion-proof valve mounting hole, and an explosion-proof valve protection film is disposed on the explosion-proof valve. A sealing ring is connected to the edge of the cap sheet. The current collector plate of the battery electrode core is welded to the cap assembly through the current collector plate connection piece.

8. A battery according to claim 6, wherein, The battery is a cylindrical battery.

9. A manufacturing method of a battery electrode core, characterized in that, For manufacturing a battery electrode core as described in any one of claims 1 to 5, it includes the following steps: Prepare electrode sheets and a spacer with a perforation. The electrode sheets have at least two tabs that are integrally connected to the same electrode sheet and are stacked to form tab parts when the electrode sheet is wound. Wind the electrode sheets to form a core part. During the process of winding the electrode sheets to form the core part, the tabs are stacked to form tab parts. Connect the spacer to the end of the core part and make the tab parts pass through the perforation.

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