Roll core connecting structure and battery

Abstract

The utility model relates to a roll core connecting structure and a battery, the roll core connecting structure comprises a cover plate assembly, a connecting assembly and a holder, the cover plate assembly comprises a positive pole and a negative pole; the connecting assembly comprises conductive pieces arranged on the two sides of the cover plate assembly, and the two conductive pieces are connected with the positive pole and the negative pole respectively; a tab welding part is arranged on the conductive piece and is used for being welded with a tab of the roll core; the retainer is connected with the cover plate assembly and the connecting assembly to form a containing space used for containing the roll core. According to the roll core connecting structure provided by the invention, the tab is directly welded on the tab welding part of the conductive piece, and a rivet and a tab clamping plate are omitted, so that working procedures such as punching and riveting are not needed when the tab is connected, and the connecting procedure is simplified. Meanwhile, parts such as rivets, tab clamping plates and the like are omitted, so that the weight of the battery is reduced, the mounting space of the roll core is increased, and the capacity of the battery can be further improved when the volume of the roll core is increased under the condition that the size of the retainer is not changed.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a core connection structure and a battery. Background Art

[0002] During the production process of new energy power batteries, the core is the core component in the battery, undertaking the tasks of storing and releasing electrical energy. The core is usually encapsulated inside the battery, and the positive and negative tabs on the core undertake the task of current transmission. Therefore, it is necessary to ensure the stability and reliability of the tab connection.

[0003] In the prior art, for the connection of the core tabs, first, holes need to be drilled on the core tabs and the tab connection block, the rivets are passed through the through holes on the tabs and the tab connection block, and then through the riveting process, the rivets are connected with the tab clamping plate, so that the tabs and the tab connection block are fixedly connected. Then, the tab connection block is connected with the pole column, and the connection process is relatively complex and difficult to implement. At the same time, setting the rivets and the tab clamping plate will compress the installation space of the core, resulting in the battery capacity being limited due to the small volume of the core. Utility Model Content

[0004] This application provides a core connection structure and a battery to solve the technical problems in the prior art that the connection process of the core tabs is complex and the installation space of the core is limited due to many components.

[0005] In a first aspect, this application provides a core connection structure, including:

[0006] A cover plate assembly, the cover plate assembly includes a positive pole column and a negative pole column;

[0007] A connection assembly, the connection assembly includes conductive members arranged on both sides of the cover plate assembly, and the two conductive members are respectively connected with the positive pole column and the negative pole column; the conductive member is provided with a tab welding part for welding with the tab of the core;

[0008] A cage, the cage is respectively connected with the cover plate assembly and the connection assembly to form a receiving space for accommodating the core.

[0009] Optionally, the conductive member includes a first connection part and a second connection part connected at an angle, the first connection part has a connection hole for embedding the positive pole column or the negative pole column;

[0010] The second connection part includes a tab welding part and a first positioning part connected in an N shape, the first positioning part is in contact with the inner wall of the cage, and there is a preset distance between the tab welding part and the inner wall of the cage, and the preset distance is matched with the thickness of the tab.

[0011] Optionally, the cage has a first plate body, a second plate body, and a third plate body. The first plate body and the second plate body are vertically connected to both sides of the third plate body, and two conductive members are respectively disposed opposite to the first plate body and the second plate body; both sides of the cover plate assembly are detachably connected to the first plate body and the second plate body.

[0012] Optionally, the first plate body, the second plate body, and the third plate body are of an integral structure, and electrolyte circulation holes are provided on the first plate body, the second plate body, and the third plate body.

[0013] Optionally, the cover plate assembly further includes a first pole plate and a second pole plate. The first pole plate and the positive pole are of an integral structure, and the second pole plate and the negative pole are of an integral structure.

[0014] Optionally, the cover plate assembly further includes a pole plate spacer, an upper cover plate, and a lower cover plate. The positive pole or the negative pole sequentially passes through the pole plate spacer, the upper cover plate, and the lower cover plate and is connected to the conductive member;

[0015] The pole plate spacer, the upper cover plate, the lower cover plate, and the conductive member are provided with a second positioning portion and / or a third positioning portion, and the second positioning portion and the third positioning portion cooperate to achieve positioning between two adjacent components.

[0016] Optionally, the second positioning portion and the third positioning portion are in a concave-convex fit.

[0017] Optionally, the cover plate assembly further includes a sealing member, and the sealing member is sleeved on the positive pole or the negative pole;

[0018] The pole plate spacer has a first through hole for inserting the positive pole or the negative pole, and there is a clearance fit between the positive pole or the negative pole and the first through hole; the sealing member abuts between the first through hole and the positive pole or the negative pole.

[0019] Optionally, the two sides of the lower cover plate are provided with first clamping portions, and the two sides of the cage are provided with second clamping portions, and the first clamping portions and the second clamping portions are arranged to match each other.

[0020] In a second aspect, the present application provides a battery, including the core connection structure provided in the first aspect of the present application.

[0021] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0022] The core connection structure provided by the embodiment of the present application simplifies the connection process of the core tabs by directly welding the tabs to the tab welding part of the conductive member, eliminating the rivets and tab clamping plates, and thus no longer requiring processes such as punching and riveting during tab connection. Meanwhile, by eliminating parts such as rivets and tab clamping plates, the weight of the battery is reduced, and the installation space of the core is increased. When the volume of the core increases while the size of the cage remains unchanged, the capacity of the battery can be further improved. The cage can support and protect the core and the tabs, ensuring the stability and reliability of the tab connection. Brief Description of the Drawings

[0023] The accompanying drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present application and, together with the specification, are used to explain the principles of the present application.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] One or more embodiments are exemplarily illustrated by the pictures in the corresponding accompanying drawings. These exemplary illustrations do not limit the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the drawings in the figures do not constitute a proportional limitation.

[0026] Figure 1 It is an exploded view of the core connection structure provided by the embodiment of the present application;

[0027] Figure 2 It is a schematic structural diagram of the battery provided by the embodiment of the present application;

[0028] Figure 3 It is a schematic structural diagram of the conductive member provided by the embodiment of the present application;

[0029] Figure 4 It is a schematic structural diagram of the cage provided by the embodiment of the present application;

[0030] Figure 5 It is a schematic diagram of tab welding provided by the embodiment of the present application;

[0031] Figure 6 provided by the embodiment of the present application Figure 2 top view;

[0032] Figure 7 It is a schematic structural diagram of the first pole plate and the positive pole column provided by the embodiment of the present application;

[0033] Figure 8 Structural schematic diagram of the pole post backing plate provided by the embodiment of the present application;

[0034] Figure 9 Structural schematic diagram of the upper cover plate provided by the embodiment of the present application;

[0035] Figure 10 Structural schematic diagram of the lower cover plate provided by the embodiment of the present application;

[0036] Figure 11 Structural schematic diagram of the seal provided by the embodiment of the present application.

[0037] Explanation of reference numerals:

[0038] 1. Cover plate assembly; 11. Positive pole post, 111. First pole post section; 112. Second pole post section; 12. Negative pole post; 13. First pole post plate; 131. Second positioning part A; 14. Second pole post plate; 15. Pole post backing plate; 151. First through hole; 152. Third positioning part A; 16. Upper cover plate; 161. Second through hole; 162. Explosion-proof valve hole; 163. Liquid injection hole; 164. Second positioning part B; 17. Lower cover plate; 171. First clamping part; 172. Third through hole; 173. Liquid injection through hole; 174. Explosion-proof valve through hole; 175. Third positioning part B; 18. Seal; 181. Extension part; 182. Seal main body; 183. Fourth through hole;

[0039] 2. Conductive part; 21. First connection part; 211. Connection hole; 212. Second positioning part C; 22. Second connection part; 221. Ear welding part; 222. First positioning part;

[0040] 3. Cage; 31. First plate body; 32. Second plate body; 33. Third plate body; 34. Electrolyte circulation hole; 35. Second clamping part; 36. Flange;

[0041] 4. Core; 41. Ear. Detailed implementation manners

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the scope of protection of the present application.

[0043] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed.

[0044] For ease of description, spatially relative relationship terms may be used in the text to describe the relative positional relationship or movement of one element or feature shown in the figure with respect to another element or feature. These relative relationship terms such as "inside", "outside", "inner side", "outer side", "below", "beneath", "above", "over", "front", "rear", etc. This spatially relative relationship term is intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip, attitude change, or motion state change, then these directional indications will change accordingly. For example, an element described as "below" or "beneath" other elements or features will subsequently be oriented as "above" or "over" other elements or features. Therefore, the exemplary term "below" can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.

[0045] To solve the technical problems in the prior art that the connection process of the core tab is complex and there are many components, resulting in limited installation space for the core 4, the present application provides a core connection structure and a battery. The core connection structure is provided with tab welding parts 221 on the conductive members 2, and the tabs 41 of the positive and negative electrodes of the core 4 can be directly welded to the conductive members 2 on both sides, eliminating components such as rivets and tab clamping plates, simplifying the connection process of the tabs 41, and increasing the installation space of the core 4.

[0046] Please refer to Figures 1 to 11 , in the first aspect of the embodiment of the present application, a core connection structure is provided, including a cover plate assembly 1, a connection assembly, and a cage 3. The cover plate assembly 1 includes a positive electrode post 11 and a negative electrode post 12, which are respectively used for electrically connecting to the positive and negative tabs of the core 4, as Figure 1 shown.

[0047] Please refer to Figure 1 , Figure 3 and Figure 5, the connection component includes conductive members 2 disposed on both sides of the cover plate component 1. The two conductive members 2 are respectively connected to the positive electrode post 11 and the negative electrode post 12. The conductive member 2 is provided with an ear welding portion 221 for welding with the positive ear or negative ear of the winding core 4, and the electrical connection between the electrode post and the ear 41 of the winding core 4 is realized through the conductive member 2.

[0048] Please refer to Figure 1 , Figure 2 and Figure 4 , the cage 3 is respectively connected to the cover plate component 1 and the connection component to form an accommodating space for accommodating the winding core 4, which can support and protect the winding core 4 and the ear 41, and ensure the stability and reliability of the connection of the ear 41.

[0049] It should be noted that in this application, by directly welding the ear 41 to the ear welding portion 221 of the conductive member 2, the rivets and ear clamping plates are cancelled, and there is no need to go through processes such as punching and riveting when connecting the ear 41, which simplifies the connection process of the ear 41 of the winding core 4. At the same time, by cancelling parts such as rivets and ear clamping plates, the weight of the battery is reduced, the installation space of the winding core 4 is increased, and when the volume of the winding core 4 increases while the size of the cage 3 remains unchanged, the capacity of the battery can be further improved.

[0050] Since the cover plate component 1 is usually disposed on the top of the winding core 4, and the ears 41 of the winding core 4 are usually disposed on the left and right sides of the winding core 4, in order to realize the connection between the electrode post in the cover plate component 1 and the ear 41 through the conductive member 2, in some embodiments of this application, please refer to Figure 1 and Figure 3 , the conductive member 2 includes a first connection portion 21 and a second connection portion 22 connected at an angle, wherein the first connection portion 21 is used to connect with the positive electrode post 11 or the negative electrode post 12, and the second connection portion 22 is used to connect with the ear 41 of the winding core 4. Preferably, the angle formed between the first connection portion 21 and the second connection portion 22 is 90 degrees, and the first connection portion 21 and the second connection portion 22 are transitionally connected, which can reduce the stress at the connection.

[0051] In some embodiments of this application, please refer to Figure 1 and Figure 3 , the first connection portion 21 has a connection hole 211 for embedding the positive electrode post 11 or the negative electrode post 12 to realize the conduction between the conductive member 2 and the electrode post, and connect the cover plate component 1 and the connection component into a whole, which is convenient for subsequent assembly.

[0052] In some embodiments of this application, please refer to Figure 3 and Figure 5, the second connecting portion 22 includes an ear welding portion 221 and a first positioning portion 222 connected in an N shape. The first positioning portion 222 is in contact with the inner wall of the cage 3 and is used to achieve the assembly positioning between the conductive member 2 and the cage 3. There is a preset distance between the ear welding portion 221 and the inner wall of the cage 3, and the preset distance is set to match the thickness of the ear 41. When welding the ear 41, the ear 41 is folded to fit the side of the ear welding portion 221 away from the core 4; after welding, the cover plate assembly 1, the connecting assembly and the core 4 are integrally embedded in the cage 3, and the cage 3 covers the outside of the ear 41, and the ear 41 welded on the ear welding portion 221 is protected by the cage 3, as Figure 5 shown. It can prevent the ear 41 after welding from being exposed outside, affecting the stability and reliability of the connection of the ear 41.

[0053] In some embodiments of the present application, please refer to Figure 1 , Figure 2 and Figure 4 , the cage 3 has a first plate body 31, a second plate body 32 and a third plate body 33. The first plate body 31 and the second plate body 32 are vertically connected to both sides of the third plate body 33. Both sides of the cover plate assembly 1 are detachably connected to the first plate body 31 and the second plate body 32 respectively, which is convenient for the disassembly and assembly between the cover plate assembly 1 and the cage 3.

[0054] Since the cage 3 is usually made of a non-metallic material, in some embodiments of the present application, the first plate body 31, the second plate body 32 and the third plate body 33 are of an integral structure and can be manufactured by an integral molding process. In order to protect the ear 41 after welding, there are side edges 36 on both sides in the width direction of the first plate body 31 and the second plate body 32, which are used to form three-sided protection for the ear 41, as Figure 5 shown.

[0055] In some embodiments of the present application, electrolyte flow holes 34 are provided on the first plate body 31, the second plate body 32 and the third plate body 33, which can enable the electrolyte inside the battery to flow evenly through the core 4, improving the charge and discharge performance and life of the battery.

[0056] In the existing cover plate assembly 1, it is usually necessary to set riveting blocks to be fixedly connected to the pole columns to achieve the limit of the pole columns, which will increase the assembly process of the cover plate assembly 1.

[0057] To avoid the above problems, in some embodiments of the present application, please refer to Figure 1 , the cover plate assembly 1 further includes a first pole column plate 13 and a second pole column plate 14. The first pole column plate 13 and the positive pole column 11 are of an integral structure, and the second pole column plate 14 and the negative pole column 12 are of an integral structure, which can reduce the connection process related to the pole columns and improve the assembly efficiency.

[0058] In some embodiments of the present application, please refer to Figure 1 , Figure 2 and Figure 6 , the cover plate assembly 1 further includes a pole post backing plate 15, an upper cover plate 16 and a lower cover plate 17. The positive pole post 11 or the negative pole post 12 sequentially passes through the pole post backing plate 15, the upper cover plate 16 and the lower cover plate 17 and is connected to the conductive member 2. The pole post backing plate 15 is made of PPS material. Without conductive modification, PPS material is an excellent insulating material. After conductive modification, PPS material can be converted into a conductive material. It can be selected according to needs whether the pole post backing plate 15 connected to the positive pole post 11 or the negative pole post 12 needs to be conductively modified. The upper cover plate 16 is made of a conductive material, and the lower cover plate 17 is made of a plastic material. The lower cover plate 17 can be used to isolate the upper cover plate 16 from the conductive member 2 and the winding core 4.

[0059] In order to quickly position the components in the cover plate assembly 1, the pole post backing plate 15, the upper cover plate 16, the lower cover plate 17 and the conductive member 2 are provided with second positioning portions and / or third positioning portions. The second positioning portion and the third positioning portion cooperate to achieve positioning between two adjacent components. Further, the first pole post plate 13 and the second pole post plate 14 are also provided with second positioning portions or third positioning portions for positioning and cooperating with the corresponding pole post backing plate 15.

[0060] In some embodiments of the present application, in order to reduce the positioning time, the second positioning portion and the third positioning portion are in a concave-convex fit. That is, one of the second positioning portion and the third positioning portion protrudes from the contact surface of two adjacent components, and the other is recessed from the contact surface. By performing a concave-convex fit on the second positioning portion and the third positioning portion, the positioning between two adjacent components can be quickly achieved.

[0061] As a specific embodiment of the present application, the second positioning portion is a groove, and the third positioning portion is a cylinder arranged to match the groove. Please refer to Figure 1 , Figure 3 , Figure 7 , Figure 8 , Figure 9 and Figure 10, since the structures of the first pole plate 13 and the second pole plate 14 are the same, the first pole plate 13 will be taken as an example for illustration: A second positioning portion A131 is provided at the bottom of the first pole plate 13, and a third positioning portion A152 is provided on the upper surface of the pole plate spacer 15. The positioning between the first pole plate 13 and the pole plate spacer 15 can be achieved through the second positioning portion A131 and the third positioning portion A152. A third positioning portion (not shown in the figure) is provided on the lower surface of the pole plate spacer 15, and a second positioning portion B164 is provided on the upper surface of the upper cover plate 16, which can achieve the positioning between the pole plate spacer 15 and the upper cover plate 16. By analogy, third positioning portions B175 are provided on both the upper and lower surfaces of the lower cover plate 17, and a second positioning portion C212 is provided on the conductive member 2, thereby realizing the positioning between adjacent components.

[0062] In some embodiments of the present application, please refer to Figure 1 and Figure 11 , the cover assembly 1 further includes a seal 18, and the seal 18 is sleeved on the positive pole 11 or the negative pole 12. The pole plate spacer 15 has a first through hole 151 for inserting the positive pole 11 or the negative pole 12. A clearance fit is provided between the positive pole 11 or the negative pole 12 and the first through hole 151, which can prevent damage to the first through hole 151 caused by contact between the pole made of metal material and the first through hole 151 made of PPS material. The seal 18 abuts between the inner wall of the first through hole 151 and the outer wall of the positive pole 11 or the outer wall of the negative pole 12, avoiding damage to the first through hole 151 or the pole plate spacer 15 by the metal pole. In addition, the seal 18 can be sleeved outside the pole to prevent the pole from being electrically connected to the upper cover plate 16. Preferably, the material of the seal 18 is fluororubber or PFA (perfluoroalkoxy resin), which has strong corrosion resistance and excellent electrical insulation performance.

[0063] In order to realize the cooperation between the pole and components such as the pole plate spacer 15 and the seal 18, the structure of the pole needs to be designed. Since the structures of the positive pole 11 and the negative pole 12 are the same, the positive pole 11 will be taken as an example for illustration. Please refer to Figure 7 , the positive pole 11 includes a connected first pole section 111 and a second pole section 112. Among them, the first pole section 111 has a clearance fit with the first through hole 151 on the pole plate spacer 15. The fourth through hole 183 of the seal 18 is sleeved outside the first pole section 111. The extension portion 181 is used to prevent contact between the outer wall of the first pole section 111 and the inner wall of the first through hole 151, and at the same time, the seal body 182 is used to prevent the first pole section 111 from being electrically connected to the upper cover plate 16. The second pole section 112 is used to be embedded in the connection hole 211 of the conductive member 2 to realize the fixed connection between the pole and the conductive member 2.

[0064] To facilitate the connection of the positive electrode terminal 11 and the negative electrode terminal 12 to the conductive member 2 after passing through the upper cover plate 16 and the lower cover plate 17, second through holes 161 are provided on both sides of the upper cover plate 16, and third through holes 172 are provided on both sides of the lower cover plate 17. The sealing member 18 is disposed in the second through holes 161 and the third through holes 172. The terminal passes through the fourth through hole 183 in the sealing member 18 and is connected to the conductive member 2, so that the cover plate assembly 1 and the connection assembly are connected into a whole, facilitating subsequent operations such as welding of the tab 41 and assembly with the cage 3.

[0065] In addition, an explosion-proof valve hole 162 and a liquid injection hole 163 are provided on the upper cover plate 16, and an explosion-proof valve through hole 174 and a liquid injection through hole 173 are correspondingly provided on the lower cover plate 17, facilitating the setting of the explosion-proof valve and the liquid injection operation.

[0066] In some embodiments of the present application, please refer to Figure 1 , Figure 4 and Figure 10 , first clamping portions 171 are provided on both sides of the lower cover plate 17, and second clamping portions 35 are provided on both sides of the cage 3. The first clamping portions 171 and the second clamping portions 35 are arranged in a matching manner, enabling the clamping between the cage 3 and the cover plate assembly 1, thereby realizing the protection of the winding core 4 inside the cage 3.

[0067] The second aspect of the embodiments of the present application provides a battery, including the winding core connection structure described in the above embodiments. It should be noted that one or more winding cores 4 can be provided in each winding core connection structure, which is not limited herein. After connecting the winding core 4 to the winding core connection structure, it can be integrally placed into the battery housing for encapsulation.

[0068] Please refer to Figures 1 to 11 , in some embodiments of the present application, the connection method between the winding core connection structure and the winding core 4 is as follows:

[0069] Step 1: Assemble the cover plate assembly 1, embed the second terminal segment 112 of the terminal in the connection hole 211 of the conductive member 2, and fixedly connect the terminal to the conductive member 2 through processes such as welding, so that the cover plate assembly 1 and the connection assembly are connected into a whole.

[0070] Step 2: Place the winding core 4 between two conductive members 2, fold the tab 41 and fit it outside the tab welding portion 221 of the conductive member 2, and weld the tab 41 to the tab welding portion 221 of the conductive member 2.

[0071] Step 3: Insert the conductive member 2 connected to the winding core 4 into the cage 3, so that the first positioning portion 222 slides down along the inner wall of the first plate body 31 or the second plate body 32 until the first clamping portion 171 on the lower cover plate 17 is engaged with the second clamping portions 35 on both sides of the cage 3.

[0072] Step 4: Place the core connection structure and the entire core 4 into the battery housing and perform encapsulation.

[0073] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0074] Although the terms first, second, third, etc. may be used herein to describe multiple elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or section from another. Unless the context clearly dictates otherwise, terms such as "first", "second", and other numerical terms when used herein do not imply an order or sequence. Thus, the first element, component, region, layer, or section discussed below may be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0075] The above description is only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A winding core connection structure, characterized in that: include: A cover plate assembly (1), the cover plate assembly (1) comprising a positive electrode column (11) and a negative electrode column (12); A connection assembly, the connection assembly comprising conductive members (2) arranged on both sides of the cover plate assembly (1), the two conductive members (2) being respectively connected to the positive electrode column (11) and the negative electrode column (12); the conductive member (2) being provided with a pole lug welding portion (221) for welding with the pole lug (41) of the winding core (4); A retaining frame (3), wherein the retaining frame (3) is respectively connected to the cover plate assembly (1) and the connecting assembly to form an accommodating space for accommodating the winding core (4).

2. The winding core connection structure according to claim 1, characterized in that: The conductive member (2) comprises a first connecting portion (21) and a second connecting portion (22) connected at an angle, the first connecting portion (21) having a connecting hole (211), the connecting hole (211) being used for embedding the positive electrode column (11) or the negative electrode column (12); The second connecting portion (22) comprises an N-shaped connected pole lug welding portion (221) and a first positioning portion (222), the first positioning portion (222) being arranged in contact with the inner wall of the retaining frame (3), and a preset distance between the pole lug welding portion (221) and the inner wall of the retaining frame (3), the preset distance being arranged to match the thickness of the pole lug (41).

3. The winding core connection structure according to claim 1, characterized in that: The retaining frame (3) comprises a first plate body (31), a second plate body (32) and a third plate body (33); the first plate body (31) and the second plate body (32) are vertically connected to two sides of the third plate body (33); the two conductive members (2) are respectively arranged opposite to the first plate body (31) and the second plate body (32); and the two sides of the cover plate assembly (1) are respectively detachably connected to the first plate body (31) and the second plate body (32).

4. The winding core connection structure according to claim 3, characterized in that: The first plate body (31), the second plate body (32) and the third plate body (33) are an integrated structure, and the first plate body (31), the second plate body (32) and the third plate body (33) are all provided with electrolyte circulation holes (34).

5. The winding core connection structure according to claim 1, characterized in that: The cover plate assembly (1) further comprises a first pole plate (13) and a second pole plate (14); the first pole plate (13) and the positive pole (11) are an integrated structure, and the second pole plate (14) and the negative pole (12) are an integrated structure.

6. The winding core connection structure according to any one of claims 1 to 5, characterized in that: The cover plate assembly (1) further comprises a pole pad (15), an upper cover plate (16) and a lower cover plate (17); the positive pole (11) or the negative pole (12) passes through the pole pad (15), the upper cover plate (16) and the lower cover plate (17) in sequence to be connected to the conductive member (2); The pole pad (15), the upper cover plate (16), the lower cover plate (17) and the conductive member (2) are provided with a second positioning portion and / or a third positioning portion, and the second positioning portion cooperates with the third positioning portion to achieve positioning between two adjacent components.

7. The winding core connection structure according to claim 6, characterized in that: The second positioning portion and the third positioning portion are concave-convex matched.

8. The winding core connection structure according to claim 6, characterized in that: The cover plate assembly (1) further comprises a sealing member (18), wherein the sealing member (18) is sleeved on the positive electrode column (11) or the negative electrode column (12); The pole pad (15) has a first through hole (151) for inserting the positive pole (11) or the negative pole (12); the positive pole (11) or the negative pole (12) and the first through hole (151) are clearance-fitted; the sealing member (18) abuts between the first through hole (151) and the positive pole (11) or the negative pole (12).

9. The winding core connection structure according to claim 6, characterized in that: The lower cover plate (17) is provided with first clamping parts (171) on both sides, and the retaining frame (3) is provided with second clamping parts (35) on both sides, and the first clamping parts (171) and the second clamping parts (35) are matched with each other.

10. A battery, characterized in that: It comprises the winding core connection structure as described in any one of claims 1 to 9.

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