Pole core assembly and battery

Abstract

The utility model discloses a kind of pole core assembly and battery.Pole core assembly, including connecting sheet, main body and insulating piece, main body includes at least one pole core, the length direction of main body both ends is formed end face, insulating piece is covered in the outside of main body;Pole lug of pole core is led out from end face;Connecting sheet includes the first connecting part and the second connecting part of being connected, first connecting part is flat, first connecting part is connected in pole lug, the thickness direction of the leading-out end face portion of pole lug coincides with the thickness direction of first connecting part and the length direction of main body, the second connecting part is bent and extend to the side of first connecting part away from main body;Second connecting part is suitable for connecting the cover of battery, the orthographic projection of pole lug in the end face of main body is located in the orthographic projection of second connecting part in the end face of main body outside.Pole lug and second connecting part do not exist in the length direction of main body "size superposition", reduce the volume proportion of structural member in battery interior, can promote the energy density of lithium battery.

Description

Technical Field

[0001] This utility model belongs to the field of batteries, and in particular relates to a core assembly and a battery. Background Technology

[0002] In the research and development and production of lithium batteries, reducing the volume occupied by battery structural components is an important method to effectively improve the energy density of lithium batteries.

[0003] In existing technologies, the way the connecting pieces fit with the main body in the internal structural components of the battery occupies a lot of space inside the battery, resulting in a reduction in the effective volume of the battery and restricting further improvement in the energy density of lithium batteries. Utility Model Content

[0004] The technical problem to be solved by this utility model is: in the prior art, the way the connecting piece and the main body fit together in the internal structure of the battery will occupy a lot of space inside the battery, resulting in a reduction in the effective volume of the battery and restricting the further improvement of the energy density of lithium battery. This utility model provides a core component and a battery.

[0005] To address the aforementioned problems, this utility model provides an electrode core assembly, comprising a connecting piece, a main body, and an insulating component. The main body includes at least one electrode core, and both ends of the main body along its length are formed with end faces. The insulating component covers the exterior of the main body. The electrode tabs of the electrode core extend from the end faces. The connecting piece includes a first connecting part and a second connecting part connected together. The first connecting part is flat and connected to the electrode tab. The thickness direction of the lead-out end face of the electrode tab coincides with the thickness direction of the first connecting part and the length direction of the main body. The second connecting part is bent and extends to the side of the first connecting part away from the main body. The second connecting portion is adapted to connect to the cover plate of the battery, and the orthographic projection of the electrode tab on the end face of the main body is located outside the orthographic projection of the second connecting portion on the end face of the main body.

[0006] Optionally, the insulating member is square, and the length direction of the insulating member coincides with the length direction of the main body. Both ends of the length direction of the insulating member are provided with openings, and the second connecting part can extend out of the openings so that the second connecting part can be connected to the cover plate.

[0007] Optionally, the electrode assembly further includes a limiting component that can fix the insulating element to the body.

[0008] Optionally, the limiting component includes a first limiting member, the insulating member has a first side and a second side opposite to each other along its thickness direction, the first limiting member covers the outside of the tab and the first connecting portion, one end of the first limiting member is connected to the first side of the insulating member, and the other end of the first limiting member is connected to the second side of the insulating member.

[0009] Optionally, the limiting component includes a second limiting member, the insulating member has a third side and a fourth side opposite to each other in the width direction, a gap is formed on the third side of the insulating member, the gap penetrates the insulating member in the length direction of the insulating member, and the second limiting member covers the outside of the gap; One end of the second limiting member is connected to the first side of the insulating member, and the other end of the second limiting member is connected to the second side of the insulating member; or, the second limiting member is attached to the third side of the insulating member, and the second limiting member extends along the length direction of the insulating member.

[0010] Optionally, the electrode assembly further includes a reinforcing member connected to the insulating member, the reinforcing member being used to prevent wear when the insulating member collides with external components.

[0011] Optionally, the reinforcing members are provided at all four corners of the insulating member.

[0012] Optionally, the main body includes a plurality of electrode cores arranged sequentially along its thickness direction, and the electrode tabs include a positive electrode tab and a negative electrode tab. The positive electrode tab is located at one end of the length direction of the main body, and the negative electrode tab is located at the other end of the length direction of the main body. The positive electrode tab is connected to one of the connecting pieces, and the negative electrode tab is connected to another connecting piece.

[0013] According to the electrode assembly provided in this embodiment of the present invention, the connecting piece is divided into a first connecting portion (flat) and a second connecting portion (bent and extended). The first connecting portion is directly connected to the electrode tab, and the directional relationship among the three is strictly defined: the thickness direction of the electrode tab portion extending from the main body end face and the thickness direction of the first connecting portion both coincide with the length direction of the main body. Since the thickness directions of the electrode tab and the first connecting portion are consistent with the length direction of the main body, and the second connecting portion is bent and extended to the side of the first connecting portion away from the main body, when the battery cover is connected to the second connecting portion, the pressure of the cover is mainly borne by the second connecting portion, and the electrode tab is not directly squeezed by the cover. This structurally prevents the electrode tab from "inserting" (i.e., the electrode tab being pressed into the main body) due to compression, avoiding the risk of short circuits. After bending, the second connecting portion is located on the side of the first connecting portion away from the main body, and the orthographic projection of the electrode tab on the main body end face is located outside the orthographic projection of the second connecting portion. This ensures that there is no "size overlap" between the electrode tab and the second connecting portion in the length direction of the main body. By reducing the volume ratio of structural components inside the battery, more electrode cores or active materials can be accommodated within the same battery casing size, thereby increasing the energy density of lithium batteries.

[0014] This utility model provides a battery including a casing, a cover plate, and the aforementioned electrode core assembly. The casing has a storage space, the main body is disposed in the storage space, the cover plate covers the casing, and the second connecting part is connected to the cover plate.

[0015] Optionally, the battery further includes a support member for supporting the main body, the support member being disposed on the cover plate, and the main body being connected to the support member. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an exploded view of a battery provided in one embodiment of the present invention; Figure 2 for Figure 1 A magnified view of A; Figure 3 This is a schematic diagram of the battery structure provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of a battery provided in one embodiment of the present invention; Figure 5 for Figure 4 A magnified view of B; Figure 6 This is a schematic diagram of the main body provided in one embodiment of the present utility model; Figure 7 This is a schematic diagram illustrating the connection relationship between the connecting piece, the electrode tab, and the main body during the manufacturing process of the electrode core assembly provided in one embodiment of this utility model; Figure 8 This is a schematic diagram illustrating another connection relationship between the connecting piece, the electrode tab, and the main body during the manufacturing process of the electrode core assembly provided in one embodiment of this utility model. Figure 9 This is a schematic diagram illustrating another connection relationship between the connecting piece, the electrode tab, and the main body during the manufacturing process of the electrode core assembly provided in one embodiment of this utility model. Figure 10 This is a schematic diagram of the structure of the core assembly provided in one embodiment of the present invention; Figure 11 This is a schematic diagram showing the connection relationship between the electrode core assembly, the cover plate, and the shell in the battery manufacturing process according to one embodiment of the present invention; Figure 12 This is a schematic diagram of the structure of the core assembly provided in one embodiment of the present invention.

[0018] The reference numerals in the accompanying drawings are as follows: 10. Core assembly; 20. Housing; 30. Cover plate; 40. Support component; 1. Connecting piece; 11. First connecting part; 12. Second connecting part; 2. Main body; 21. Electrode core; 211. Electrode ear; 3. Insulating component; 31. Opening; 32. Gap; 4. Limiting component; 41. First limiting component; 42. Second limiting component; 5. Reinforcing component. Detailed Implementation

[0019] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] In the description of this utility model, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figures 1 to 12 As shown, an embodiment of the present invention provides an electrode core assembly 10, including a connecting piece 1, a main body 2 and an insulating member 3. The main body 2 includes at least one electrode core 21. Both ends of the main body 2 in the length direction are formed with end faces. The insulating member 3 covers the outside of the main body 2. The electrode tabs 211 of the electrode core 21 are led out from the end faces. The connecting piece 1 includes a first connecting part 11 and a second connecting part 12 connected together. The first connecting part 11 is flat and is connected to the tab 211. The thickness direction of the lead-out end face of the tab 211 coincides with the thickness direction of the first connecting part 11 and the length direction of the main body 2. The second connecting part 12 is bent and extends to the side of the first connecting part 11 away from the main body 2. The second connecting portion 12 is adapted to connect the battery cover plate 30, and the orthographic projection of the electrode tab 211 on the end face of the main body 2 is located outside the orthographic projection of the second connecting portion 12 on the end face of the main body 2. In this embodiment, the electrode core assembly 10 is manufactured as follows: Figure 6 and Figure 7 As shown, the first connecting portion 11 of the thinner, flat, flexible connecting piece 1 is first welded to the lead-out end face of the tab 211. For example... Figure 7 and Figure 8 As shown, after welding, the tab 211 is bent so that the thickness direction of the lead-out end face of the tab 211 roughly coincides with the thickness direction of the first connecting part 11 and the length direction of the main body 2. Figure 9 and Figure 10As shown, the outer part of the main body 2 is covered with an insulating component 3 to prevent the electrode core 21 from directly contacting other internal components of the battery (such as the casing 20 and the metal structure of the cover plate 30), thus preventing external short circuits. Then, the second connecting portion 12 of the connecting piece 1 is bent away from the main body 2 (90° or other suitable angles can be used), so that it initially extends to the outside of the first connecting portion 11. Understandably, Figure 9 The main body 2 is composed of multiple pole cores 21. For example... Figure 11 As shown, the second connecting part 12 is then welded to the battery cover plate 30. When the cover plate 30 is assembled onto the battery casing 20, the second connecting part 12 bends further with the position of the cover plate 30, ultimately causing the second connecting part 12 to bend approximately 180° relative to the first connecting part 11, so that the second connecting part 12 is located on the side of the first connecting part 11 away from the main body 2. This ensures that the orthographic projection of the tab 211 on the end face of the main body 2 is outside the orthographic projection of the second connecting part 12, achieving a non-overlapping spatial arrangement. It is understood that the thickness directions of both the tab 211 and the first connecting part 11 are approximately aligned with the length direction of the main body 2, and the second connecting part 12 is ultimately located on the side of the first connecting part 11 away from the main body 2, so that the pressure of the battery cover plate 30 is borne only by the second connecting part 12, and the tab 211 is not squeezed by the cover plate 30. This structurally prevents the tab 211 from "inserting" (inserting into the main body 2) due to compression, thereby preventing the positive and negative tabs 211 from contacting or short-circuiting with metal components, ensuring battery safety. Meanwhile, in conventional technology, after the portion connecting the connecting piece 1 to the cover plate 30 is bent, it overlaps with the tab 211 in the thickness direction of the electrode core 21, resulting in overlapping dimensions and occupying additional space. In this solution, the second connecting part 12 is located outside the first connecting part 11 after two bends, and the orthographic projections of the tab 211 and the second connecting part 12 do not overlap (the tab 211 is projected outside the projection of the second connecting part 12), avoiding the overlapping dimensions of the two in the length or thickness direction of the main body 2, and significantly reducing the space occupancy rate of the structural components. After the space occupancy is reduced, the effective internal volume of the battery increases, which can accommodate more electrode cores 21 or active materials, further improving the energy density of the lithium battery. In addition, the connecting piece 1 is a flexible and thin flat structure, which makes it easier to bend. Its bending process can adapt to the limitations of the internal assembly space of the battery, ensuring a stable electrical connection between the tab 211 and the cover plate 30 while taking into account structural flexibility, which facilitates assembly operations in mass production.

[0023] In one embodiment, the insulating member 3 is square, and its length direction coincides with the length direction of the main body 2. Openings 31 are provided at both ends of the insulating member 3's length direction, allowing the second connecting part 12 to extend out of the openings 31 and connect with the cover plate 30. In this embodiment, the square insulating member 3 is formed by wrapping the main body 2 with the insulating member 3. The insulating member 3 is an insulating film, its length direction coincides with the length direction of the main body 2, and it has openings 31 at both ends. The insulating film only wraps the sides of the main body 2, not the two ends along its length. This allows the second connecting part 12 of the connecting piece 1 to extend smoothly from the openings 31, providing sufficient operating space for subsequent bending (including the initial bending when connecting to the cover plate 30 and further bending after the cover plate 30 is assembled). This avoids the insulating member 3 obstructing the movement of the second connecting part 12, ensuring that the bending process can be flexibly implemented (such as a 90° initial bend and a final 180° bend), meeting the requirements for a stable connection with the cover plate 30. The insulating film only wraps the sides of the main body 2, specifically isolating the electrode core 21 from contact with the side metal parts such as the battery casing 20, preventing external short circuits; while not wrapping the two ends in the length direction of the main body 2, it reduces the ineffective consumption of insulating material and avoids interference with the lead-out of the electrode tab 211, the welding and bending of the connecting piece 1, ensuring that the connection area between the electrode tab 211 and the connecting piece 1 and the extension path of the second connecting part 12 are not blocked by the insulating part 3, thus improving the structural compactness.

[0024] In one embodiment, the electrode core assembly 10 further includes a limiting component 4, which can fix the insulating member 3 to the main body 2. In this embodiment, the limiting component 4 can firmly fix the insulating member 3 to the main body 2, preventing the insulating member 3 from shifting or falling off due to external forces such as vibration and compression during battery assembly, transportation, or use. This ensures that the insulating member 3 always fits against the side of the main body 2, continuously playing its role in isolating the electrode core 21 from external metal components (such as the housing 20), and fundamentally avoiding the risk of external short circuits caused by loosening of the insulating member 3.

[0025] In one embodiment, the limiting component 4 includes a first limiting member 41. The insulating member 3 has a first side and a second side opposite to each other along its thickness direction. The first limiting member 41 covers the outside of the tab 211 and the first connecting portion 11. One end of the first limiting member 41 is connected to the first side of the insulating member 3, and the other end of the first limiting member 41 is connected to the second side of the insulating member 3. In this embodiment, the first limiting member 41 includes adhesive tape, which covers the outside of the tab 211 after wrapping the insulating member 3. This can specifically isolate the tab 211 from direct contact with metal parts such as the battery cover plate 30 and the housing 20, further improving battery safety. One end of the adhesive tape is connected to the first side of the insulating member 3, and the other end is connected to the second side, forming a "binding structure" that spans the thickness direction of the insulating member 3, which can firmly clamp the insulating member 3 to the main body 2. This effectively prevents the insulating component 3 from shifting or warping during battery assembly or use, ensuring the stability of the openings 31 at both ends of the insulating component 3. This provides a continuous and reliable spatial foundation for the smooth extension and precise bending of the second connecting part 12, avoiding spatial layout disorder caused by the loosening of the insulating component 3. In use, the first limiting component 41 can be used after the insulating component 3 wraps around the main body 2 and before the second connecting part 12 is bent. During the bending stage of the second connecting part 12, the tape has been fixed and is thin, so it will not hinder the bending away from the main body 2 (including further bending when connecting with the cover plate 30). This perfectly matches the space optimization goal of "no size overlap between the tab 211 and the second connecting part 12", helping to improve energy density.

[0026] In one embodiment, the limiting component 4 includes a second limiting member 42, the insulating member 3 has a third side and a fourth side opposite to each other in the width direction, a gap 32 is formed on the third side of the insulating member 3, the gap 32 penetrates the insulating member 3 in the length direction of the insulating member 3, and the second limiting member 42 covers the outside of the gap 32. One end of the second limiting member 42 is connected to the first side of the insulating member 3, and the other end of the second limiting member 42 is connected to the second side of the insulating member 3; or, the second limiting member 42 is attached to the third side of the insulating member 3, and the second limiting member 42 extends along the length direction of the insulating member 3. In this embodiment, the second limiting member 42 can be an adhesive tape. When the insulating member 3 wraps the main body 2, its first and last ends form a gap 32 that runs through the entire length direction, which is a structural feature that is difficult to avoid in the wrapping process. The second limiting member 42 covering the outside of the gap 32 can be divided into two cases. One case is that the two ends of the second limiting member 42 are respectively connected to the first side and the second side of the insulating member 3. In this case, multiple mutually spaced second limiting members 42 can be set to fasten the insulating member 3 to the main body 2. The other case is that the second limiting member 42 is located on the third side of the insulating member 3, covering the entire gap 32, thereby fastening the insulating member 3 to the main body 2. By setting the second limiting member 42, the first and last ends of the insulating member 3 at the gap 32 can be firmly fixed, preventing the insulating member 3 from loosening due to the gap 32 opening when under force. This design specifically solves the structural stability problem that the gap 32 may cause, ensuring that the insulating member 3 is always tightly attached to the side of the main body 2, avoiding the exposure of the main body 2 due to the expansion of the gap 32, and thus preventing the electrode core 21 from contacting and short-circuiting with external components.

[0027] In one embodiment, the electrode assembly 10 further includes a reinforcing member 5 connected to the insulating member 3. The reinforcing member 5 is used to prevent wear and tear on the insulating member 3 when it collides with external components. In this embodiment, wear or damage to the insulating member 3 is one of the important causes of battery failure, and the reinforcing member 5 reduces the probability of such failures through active protection. The application of the reinforcing member 5 can reduce the product defect rate caused by damage to the insulating member 3; in end-use, it can reduce safety accidents (such as short circuits and overheating) caused by insulation failure, thereby improving the reliability of the entire battery product and reducing after-sales maintenance costs and brand risks.

[0028] In one embodiment, the insulating member 3 is provided with reinforcement members 5 at all four corners.

[0029] The four corners of the insulating component 3 are the areas most prone to impact and wear during assembly and use. When the electrode core assembly 10 is installed into the battery casing 20, the four corners may scratch with external components such as the edges of the casing 20 and the corners of the cover plate 30; during battery use, vibration or impact can also easily cause the four corners to come into contact with other components first. Setting reinforcement members 5 at the four corners can directly provide physical protection for these vulnerable parts, prevent the insulating component 3 from tearing or breaking due to impact, ensure that the insulating component 3 always covers the sides of the main body 2 completely, maintain the effectiveness of the insulation barrier at critical points, and reduce the risk of short circuit between the electrode core 21 and external metal components.

[0030] In one embodiment, the main body 2 includes multiple electrode cores 21, which are arranged sequentially along their thickness direction. Each electrode tab 211 includes a positive tab 211 and a negative tab 211. The positive tab 211 is located at one end of the length direction of the main body 2, and the negative tab 211 is located at the other end of the length direction of the main body 2. Each positive tab 211 is connected to a connecting piece 1, and each negative tab 211 is connected to another connecting piece 1. In this embodiment, the main body 2 includes multiple electrode cores 21, each electrode core 21 including two positive tabs 211 and two negative tabs 211. Each electrode core 21 has two positive tabs 211 and two negative tabs 211 connected to a connecting piece 1. This design can distribute the current during battery charging and discharging to more tabs 211 and connecting pieces 1. Compared to a concentrated conductive method using a few tabs 211, the distributed connection reduces the current density of individual tabs 211 and connecting pieces 1, minimizing issues like overheating and aging caused by excessive local current, thus extending the lifespan of tabs 211 and connecting pieces 1. Simultaneously, it ensures more uniform and stable current conduction, improving the overall battery performance. Each positive and negative tab 211 is connected to an independent connecting piece 1, forming a multi-path conductive structure. Even if one tab 211 or connecting piece 1 fails (e.g., breakage, poor contact), the other tabs 211 and connecting pieces 1 can still function normally, preventing the battery from failing due to a single point of failure. Furthermore, the distributed tabs 211 and connecting pieces 1 reduce the possibility of localized overheating, lowering the risk of short circuits, fires, and other safety accidents caused by high temperatures, providing multiple safeguards for the safe operation of the battery.

[0031] According to the electrode assembly 10 provided in this embodiment of the present invention, the connecting piece 1 is divided into a first connecting portion 11 (flat) and a second connecting portion 12 (bent and extended). The first connecting portion 11 is directly connected to the tab 211, and the directional relationship among the three is strictly defined: the thickness direction of the portion of the tab 211 extending from the end face of the main body 2 and the thickness direction of the first connecting portion 11 both coincide with the length direction of the main body 2. Since the thickness directions of the tab 211 and the first connecting portion 11 are consistent with the length direction of the main body 2, and the second connecting portion 12 bends and extends to the side of the first connecting portion 11 away from the main body 2, when the battery cover 30 is connected to the second connecting portion 12, the pressure of the cover 30 is mainly borne by the second connecting portion 12, and the tab 211 is not directly squeezed by the cover 30. This structurally prevents the tab 211 from "inserting" due to compression (i.e., the tab 211 is pressed into the interior of the main body 2), avoiding the risk of short circuit. After being bent, the second connecting portion 12 is located on the side of the first connecting portion 11 away from the main body 2, and the orthographic projection of the tab 211 on the end face of the main body 2 is located outside the orthographic projection of the second connecting portion 12. This ensures that there is no "size overlap" between the tab 211 and the second connecting portion 12 in the length direction of the main body 2. This reduces the volume ratio of the structural components inside the battery, allowing more electrode cores 21 or active materials to be accommodated within the same battery casing size, thereby increasing the energy density of the lithium battery.

[0032] In addition, one embodiment of this utility model provides a battery including a housing 20, a cover plate 30, and the electrode core assembly 10 described in the above embodiment. The housing 20 has a storage space, the main body 2 is disposed in the storage space, the cover plate 30 covers the housing 20, and the second connecting part 12 is connected to the cover plate 30. In this embodiment, the electrode core assembly 10 is disposed in the storage space of the battery housing 20. Due to the structural optimization of the connecting piece 1 (the thickness direction of the tab 211 and the first connecting part 11 coincides with the length direction of the main body 2, and the second connecting part 12 does not overlap with the tab 211 after bending), the space occupancy rate of the structural components is greatly reduced. Compared with the design of traditional batteries where the connecting piece 1 and the tab 211 overlap and occupy extra space, this battery can accommodate more electrode cores 21 or active materials within the same housing 20 size, directly increasing the energy storage capacity per unit volume, effectively improving the battery energy density, and better meeting the needs of high-endurance devices. The flexible characteristics and directional design of the connecting piece 1 in the core assembly 10 avoid the insertion problem caused by the pressure of the cover plate 30 on the tab 211, thereby reducing the possibility of contact between the positive and negative tabs 211 or short circuit with metal parts from the root. At the same time, the stable covering of the insulating component 3 (in conjunction with the limiting component 4 and the reinforcing component 5) further isolates the core 21 from direct contact with the housing 20 and the cover plate 30. When the cover plate 30 is closed on the housing 20 and connected to the second connecting part 12, a dual safety barrier of "structural avoidance + insulation protection" is formed inside the battery, which greatly reduces the risk of short circuit during battery assembly and use and improves overall safety.

[0033] In one embodiment, the battery further includes a support member 40 for supporting the main body 2. The support member 40 is disposed on the cover plate 30, and the main body 2 is connected to the support member 40. In this embodiment, the support member 40 is disposed on the cover plate 30 and connected to the main body 2, which can provide stable support for the main body 2 and prevent the electrode core assembly 10 from shaking or shifting within the storage space of the battery casing 20. Especially when the battery is under complex operating conditions such as vibration and impact, the support member 40 can limit the displacement range of the main body 2 through its connection with the main body 2, ensuring that the relative positions of conductive structures such as the electrode tab 211 and the connecting piece 1 with the cover plate 30 and the casing 20 remain stable, providing a basis for stable current conduction and the coordinated operation of various components. The support member 40 is made of plastic. In conventional technology, to prevent short circuits or even fires and explosions caused by the insertion of the tab 211, the height of the plastic support member 40 is needed to isolate the tab 211 from the cover plate 30. Furthermore, the height of most of this plastic is greater than 5mm. Since the plastic accounts for a large proportion of the total volume of the structural components inside the battery, it significantly occupies internal battery space, limiting the improvement of energy density. In this application, the flexible connecting piece 1 structurally avoids the tab 211 being squeezed by the cover plate 30 (the thickness direction of the tab 211 and the first connecting part 11 coincides with the length direction of the main body 2, and the second connecting part 12 bears the pressure of the cover plate 30). Therefore, it eliminates the need to rely on the height of the plastic support member 40 to isolate the tab 211 from the cover plate 30, thus significantly reducing the height of the plastic. This improvement effectively reduces the volume ratio of plastic inside the battery, freeing up more space to accommodate active materials and directly contributing to the improvement of battery energy density.

[0034] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model 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 of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

Claims

1. A core component, characterized in that, The device includes a connecting piece, a main body, and an insulating component. The main body includes at least one electrode core, and both ends of the main body along its length are formed into end faces. The insulating component covers the outside of the main body. The electrode core's tabs extend from the end faces. The connecting piece includes a first connecting part and a second connecting part connected together. The first connecting part is flat and connected to the electrode tab. The thickness direction of the lead-out end face of the electrode tab coincides with the thickness direction of the first connecting part and the length direction of the main body. The second connecting part is bent and extends to the side of the first connecting part away from the main body. The second connecting portion is adapted to connect to the cover plate of the battery, and the orthographic projection of the electrode tab on the end face of the main body is located outside the orthographic projection of the second connecting portion on the end face of the main body.

2. The electrode core assembly according to claim 1, characterized in that, The insulating component is square, and its length direction coincides with that of the main body. Both ends of the insulating component's length direction are provided with openings, and the second connecting part can extend out of the openings to connect with the cover plate.

3. The electrode core assembly according to claim 2, characterized in that, The electrode core assembly also includes a limiting component, which can fix the insulating element to the main body.

4. The electrode core assembly according to claim 3, characterized in that, The limiting component includes a first limiting member, the insulating member has a first side and a second side opposite to each other along its thickness direction, the first limiting member covers the outside of the tab and the first connecting portion, one end of the first limiting member is connected to the first side of the insulating member, and the other end of the first limiting member is connected to the second side of the insulating member.

5. The electrode core assembly according to claim 4, characterized in that, The limiting component includes a second limiting member, the insulating member has a third side and a fourth side opposite to each other along the width direction, a gap is formed on the third side of the insulating member, the gap penetrates the insulating member along the length direction of the insulating member, and the second limiting member covers the outside of the gap; One end of the second limiting member is connected to the first side of the insulating member, and the other end of the second limiting member is connected to the second side of the insulating member; or, the second limiting member is attached to the third side of the insulating member, and the second limiting member extends along the length direction of the insulating member.

6. The electrode core assembly according to claim 2, characterized in that, The electrode core assembly also includes a reinforcing member connected to the insulating component, which is used to prevent wear when the insulating component collides with external parts.

7. The electrode core assembly according to claim 6, characterized in that, The insulating component is provided with the reinforcing members at all four corners.

8. The electrode core assembly according to claim 1, characterized in that, The main body includes a plurality of electrode cores, which are arranged sequentially along their thickness direction. The electrode tabs include a positive electrode tab and a negative electrode tab. The positive electrode tab is located at one end of the length direction of the main body, and the negative electrode tab is located at the other end of the length direction of the main body. The positive electrode tab is connected to one of the connecting pieces, and the negative electrode tab is connected to another connecting piece.

9. A battery, characterized in that, The device includes a housing, a cover plate, and an electrode core assembly as described in any one of claims 1 to 8. The housing has a storage space, the main body is disposed in the storage space, the cover plate covers the housing, and the second connecting portion is connected to the cover plate.

10. The battery according to claim 9, characterized in that, The battery also includes a support member for supporting the main body, the support member being disposed on the cover plate, and the main body being connected to the support member.

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