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, and the cover plate assembly is provided with two bent edges; the connecting assembly comprises two conductive parts which are symmetrically arranged, each conductive part comprises a first connecting part which is matched with the cover plate assembly and a second connecting part which is arranged at an angle with the first connecting part, and the sides, deviating from each other, of the two second connecting parts of the two conductive parts are welding surfaces which are used for being welded with the tabs of the roll core; the retainer comprises a first plate body and second plate bodies connected to the two sides of the first plate body, the two second plate bodies are connected with the two bent edges respectively to define a containing area, the connecting assembly is arranged in the containing area, and the bent edges are located between the second connecting parts and the corresponding second plate bodies; and a space is formed between the second connecting part and the corresponding second plate body. According to the roll core connecting structure, the tabs are directly welded to the conductive parts, rivets and tab clamping plates are omitted, the tabs do not need to be subjected to punching, riveting and other procedures when connected, and the connecting procedure is simplified.

Description

Technical Field

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

[0002] In the production process of new energy power batteries, the core is the core component of 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, the stability and reliability of the tab connection need to be ensured.

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

[0004] The present 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 more components.

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

[0006] A cover plate assembly having two bent edges;

[0007] A connection assembly including two symmetrically arranged conductive members. Each conductive member includes a first connection portion cooperating with the cover plate assembly and a second connection portion arranged at an angle to the first connection portion. On the side where the two second connection portions of the two conductive members face away from each other is a welding surface for welding with the tabs of the core; and

[0008] A cage including a first plate body and second plate bodies connected to both sides of the first plate body. The two second plate bodies are respectively connected to the two bent edges to enclose a receiving area. The connection assembly is arranged in the receiving area, and the bent edge is located between the second connection portion and the corresponding second plate body, so that a spacing is formed between the second connection portion and the corresponding second plate body.

[0009] Optionally, a first clamping portion is provided on the bent edge, and a second clamping portion is provided on the second plate body. The first clamping portion and the second clamping portion are in clamping cooperation.

[0010] Optionally, the spacing is set to match the thickness of the tab.

[0011] Optionally, electrolyte flow holes are provided on both the first plate body and the second plate body.

[0012] Optionally, notches are formed on both sides in the thickness direction of the second connecting portion, and the notches are used to bend the tabs of the core.

[0013] Optionally, a positioning portion is provided on the conductive member, and the positioning portion is used to cooperate with a welding jig to limit the conductive member.

[0014] Optionally, the positioning portion is provided on a side of the second connecting portion away from the first connecting portion, and the positioning portions are provided on both opposite sides of the second connecting portion.

[0015] Optionally, the cover plate assembly includes a lower cover plate, an upper cover plate, and a terminal post sequentially arranged on the conductive member. Through holes are formed at the relative positions of the conductive member, the lower cover plate, and the upper cover plate, and the terminal post is arranged in the through hole and connected to the conductive member.

[0016] Optionally, the terminal post and the through hole are hermetically connected through a sealing ring.

[0017] In a second aspect, the present application provides a battery, including the core connection structure provided in the first aspect of the present application.

[0018] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0019] For the core connection structure provided by the embodiment of the present application, by directly welding the tabs on the conductive member, the rivets and tab clamping plates are eliminated. When connecting the tabs, there is no need to go through processes such as punching and riveting, which simplifies the connection process of the core tabs. At the same time, 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. Description of the Drawings

[0020] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0021] 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 in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] 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 are represented as similar elements. Unless otherwise stated, the drawings in the figures do not constitute a scale limitation.

[0023] Figure 1 It is an exploded view of the core connection structure provided by the embodiment of the present application;

[0024] Figure 2 It is a cross-sectional view of the core connection structure provided by the embodiment of the present application;

[0025] Figure 3 It is a schematic structural diagram of the conductive member in the core connection structure provided by the embodiment of the present application;

[0026] Figure 4 It is a schematic structural diagram of the cage in the core connection structure provided by the embodiment of the present application.

[0027] Explanation of reference numerals in the drawings:

[0028] 1. Cover plate assembly; 11. Positive pole column; 12. Negative pole column; 13. Upper cover plate; 14. Lower cover plate; 15. Bent edge; 151. First clamping portion; 16. Sealing ring;

[0029] 2. Conductive member; 21. First connection portion; 211. Connection hole; 22. Second connection portion; 221. Welding surface; 222. Notch; 23. Positioning portion;

[0030] 3. Cage; 31. First plate body; 32. Second plate body; 33. Electrolyte flow hole; 34. Second clamping portion; 35. Baffle edge. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application 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. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0032] 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.

[0033] 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 or 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 may be otherwise oriented (rotated 90 degrees or in other directions) and the spatially relative relationship descriptors used in the text are interpreted accordingly.

[0034] To solve the technical problems in the prior art that the connection process of the core tabs is complex and there are many components, resulting in limited installation space for the core, the present application provides a core connection structure and a battery. The core connection structure is provided with welding surfaces on the conductive members, and the tabs of the positive and negative electrodes of the core can be directly welded to the conductive members on both sides, eliminating components such as rivets and tab clamping plates, simplifying the tab connection process, and increasing the installation space for the core.

[0035] Please refer to Figures 1 to 4 , a first aspect of an embodiment of the present application provides a core connection structure, including a cover plate assembly 1, a connection assembly, and a cage 3. The cover plate assembly 1 has two bent edges 15. The connection assembly includes two symmetrically arranged conductive members 2. The conductive member 2 includes a first connection portion 21 that cooperates with the cover plate assembly 1 and a second connection portion 22 that is angled with respect to the first connection portion 21. On the side where the two second connection portions 22 face away from each other is a welding surface 221 for welding with the tabs of the core.

[0036] A cage 3, the cage 3 includes a first plate body 31 and second plate bodies 32 connected to both sides of the first plate body 31. The two second plate bodies 32 are respectively connected to the two bent edges 15 to enclose a receiving area. The connecting component is arranged in the receiving area, and the bent edge 15 is located between the second connecting portion 22 and the corresponding second plate body 32, so that a spacing is formed between the second connecting portion 22 and the corresponding second plate body 32.

[0037] In this application, by directly welding the tab to the welding surface 221 of the conductive member 2, the rivet and the tab clamping plate are eliminated. When connecting the tab, there is no need to go through processes such as punching and riveting, which simplifies the connection process of the tab of the core. At the same time, 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 3 remains unchanged, the capacity of the battery can be further improved.

[0038] In addition, the core is located in the receiving area. The tab of the core bypasses the side of the conductive member 2 and fits and fixes to the welding surface 221 of the conductive member 2. By forming a spacing between the second connecting portion 22 and the corresponding second plate body 32, the surface of the second connecting portion 22 facing the second plate body 32 is the welding surface 221. The spacing provides a placement position for the tab, and at the same time, the second plate body 32 can protect the tab.

[0039] Since the cover plate assembly 1 is usually arranged on the top of the core, and the tabs of the core are usually arranged on the left and right sides of the core. In order to connect the pole column in the cover plate assembly 1 with the tab through the conductive member 2, in some embodiments of the present application, please refer to Figure 1 and Figure 3 , the conductive member 2 includes a first connecting portion 21 and a second connecting portion 22 connected at an angle. The first connecting portion 21 is used to connect with the positive pole column 11 or the negative pole column 12, and the second connecting portion 22 is used to connect with the tab of the core. Preferably, the angle formed between the first connecting portion 21 and the second connecting portion 22 is 90 degrees, and the first connecting portion 21 and the second connecting portion 22 are transitionally connected, which can reduce the stress at the connection.

[0040] In some embodiments of the present application, the first connecting portion 21 has a connecting hole 211. The connecting hole 211 is used to embed the positive pole column 11 or the negative pole column 12 to realize the conduction between the conductive member 2 and the pole column, and connect the cover plate assembly 1 and the connecting component into a whole, which is convenient for subsequent assembly.

[0041] The cover plate assembly 1 is covered on the first connection part 21. The bending edges 15 of the cover plate assembly 1 are located on the opposite sides of the cover plate assembly 1. The bending edges 15 cooperate with one end of the second connection part 22 close to the first connection part 21, and the second connection part 22 is arranged in a straight plate structure, so that a gap can be formed between the second connection part 22 and the second plate body 32, and the width of the gap is the same everywhere in the length direction of the gap, avoiding waste of the overall structural space. Optionally, the gap is set to match the thickness of the tab. When welding the tab, the tab is folded to the welding surface 221 of the second connection part 22 and welded by fitting the welding surface 221. After welding, the cover plate assembly 1, the connection assembly and the core are integrally embedded in the cage 3. The cage 3 covers the outside of the tab, and the tab welded on the welding surface 221 can be protected by the cage 3, which can prevent the welded tab from being exposed outside and affecting the stability and reliability of the tab connection.

[0042] In some embodiments, notches 222 are formed on both sides of the second connection part 22 in the thickness direction. The notches 222 are used to bend the tabs of the core. The tabs of the core are bent from the notches 222 to the welding surface 221 of the conductive part 2 for welding. Through the structural setting of the notches 222, a placement space is provided for the bending of the tabs of the core, avoiding the widening of the second connection part 22 in the width direction after the tabs of the core are bent and affecting the connection interference between the second connection part 22 and other components in the future, thereby damaging the tabs of the core. In addition, the notches 222 can also play a role in positioning and guiding.

[0043] In some embodiments of the present application, a positioning part 23 is provided on the conductive part 2. The positioning part 23 is used to cooperate with a welding fixture to limit the conductive part. By cooperating the positioning part 23 with the welding fixture, the limit fixation of the conductive part 2 is realized, so as to ensure the reliability and welding effect of the tab welding. Among them, the welding fixture has a cooperation part that cooperates with the positioning part 23, and the connection can be realized by connecting the positioning part 23 of the conductive part 2 to the cooperation part on the welding fixture. Optionally, the connection between the positioning part 23 and the cooperation part includes snap-fit, embedding fit, pin-hole fit, screw fit, etc. In the present application, the embedding fit is taken as an example for description. Among them, the positioning part 23 includes a convex block or a groove. Correspondingly, the cooperation part is a groove or a convex block. The embedding connection between the positioning part 23 and the cooperation part is realized by embedding the convex block into the groove. Optionally, the positioning part 23 adopts a groove and the cooperation part adopts a convex block.

[0044] Of course, the positioning part 23 can be arranged on the first connection part 21 of the conductive part 2 or on the second connection part 22 of the conductive part 2; in the present application, the positioning part 23 is arranged on the second connection part 22. In addition, in order to avoid the positioning part 23 affecting the position of the tab, the positioning part 23 is arranged at one end of the second connection part 22 away from the first connection part 21.

[0045] Of course, in order to improve the connection effect between the conductive member 2 and the welding fixture, two positioning portions 23 are provided on the conductive member 2. Optionally, the two positioning portions 23 are respectively arranged on opposite sides of the second connecting member.

[0046] In some embodiments of the present application, referring to Figures 1 - 4 , the connection between the bent edge 15 and the cage 3 includes a fixed connection or a detachable connection. The fixed connection includes methods such as welding or bonding. In the present application, the bent edge 15 and the cage 3 adopt a detachable connection, and the detachable connection includes connection methods such as snap-fit, screw connection, and pin-hole fit. Optionally, a first snap portion 151 is provided on the bent edge 15, and a second snap portion 34 is provided on the second plate body 32. The first snap portion 151 and the second snap portion 34 are snap-fitted to achieve the detachable connection between the bent edge 15 and the second plate body 32, facilitating subsequent maintenance or replacement operations.

[0047] In some embodiments of the present application, the cage 3 includes a first plate body 31 and second plate bodies 32 connected to both sides of the first plate body 31. The two second plate bodies 32 are vertically connected to opposite sides of the first plate body 31. The two bent edges 15 of the cover plate assembly 1 are respectively detachably connected to the two second plate bodies 32, facilitating the disassembly and assembly between the cover plate assembly 1 and the cage 3.

[0048] Since the cage 3 is usually made of a non-metallic material, in some embodiments of the present application, the first plate body 31 and the second plate body 32 are of an integral structure and can be manufactured by an integral molding process. In order to protect the tab after welding, baffles 35 are provided on both sides in the width direction of the cage 3 to form a three-sided protection for the tab.

[0049] Optionally, chamfers or rounded corners are provided at both ends of the baffle 35 to play a guiding role, facilitating the connection between the cage 3 and the cover plate assembly 1 and avoiding interference.

[0050] In some embodiments of the present application, electrolyte flow holes 33 are provided on both the first plate body 31 and the second plate body 32, which can enable the electrolyte inside the battery to flow evenly through the wound core, improving the charge and discharge performance and lifespan of the battery.

[0051] In some embodiments of the present application, please refer to Figures 1 to 4, the cover plate assembly 1 includes a lower cover plate 14, an upper cover plate 13, and a pole column sequentially arranged on the conductive member 2. Through holes are provided at the relative positions of the conductive member 2, the lower cover plate 14, and the upper cover plate 13, and the pole column is arranged in the through hole and connected to the conductive member 2; the bending edge 15 can be arranged on the lower cover plate 14 or on the upper cover plate 13. Among them, the upper cover plate 13 can be made of a conductive material, and the lower cover plate 14 can be made of a plastic material, and the lower cover plate 14 can be used to isolate the upper cover plate 13 from the conductive member 2 and the winding core. In this application, the bending edges 15 are formed on the opposite sides of the lower cover plate 14.

[0052] Optionally, the pole column and the through hole are hermetically connected through a sealing ring 16, and the sealing ring 16 is sleeved on the positive pole column 11 or the negative pole column 12.

[0053] In the second aspect of the embodiments of the present application, a battery is provided, including the winding core connection structure described in the above embodiments. It should be noted that one or more winding cores can be provided in each winding core connection structure, and no limitation is made here. After connecting the winding core to the winding core connection structure, the whole can be placed in a battery housing for encapsulation.

[0054] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" as used in the text may also include the plural forms. The terms "include", "comprise", "contain", and "have" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or their combinations. The method steps, processes, and operations described in the text are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is explicitly stated. It should also be understood that additional or alternative steps can be used.

[0055] Although the terms first, second, third, etc. can be used in the text 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 can only be used to distinguish one element, component, region, layer, or section from another region, layer, or section. Unless the context clearly indicates otherwise, terms such as "first" and "second" and other numerical terms do not imply an order or sequence when used in the text. Therefore, the first element, component, region, layer, or section discussed below can be referred to as the second element, component, region, layer, or section without departing from the teachings of the example embodiments.

[0056] The above are 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 these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A core connection structure, characterized in that: include: A cover plate assembly (1), wherein the cover plate assembly (1) has two bent edges (15); A connection assembly, the connection assembly comprising two symmetrically arranged conductive members (2), the conductive members (2) comprising a first connection portion (21) cooperating with the cover plate assembly (1) and a second connection portion (22) arranged at an angle to the first connection portion (21), the two second connection portions (22) of the two conductive members (2) having sides facing away from each other as welding surfaces (221) for welding to a lug of a winding core; and A retaining frame (3), the retaining frame (3) comprising a first plate body (31) and second plate bodies (32) connected to both sides of the first plate body (31), the two second plate bodies (32) being respectively connected to the two bent edges (15) to enclose a receiving area, the connecting component being arranged in the receiving area, and the bent edge (15) being located between the second connecting portion (22) and the corresponding second plate body (32), so that a spacing is formed between the second connecting portion (22) and the corresponding second plate body (32).

2. The winding core connection structure according to claim 1, characterized in that: The bent edge (15) is provided with a first clamping portion (151), the second plate body (32) is provided with a second clamping portion (34), and the first clamping portion (151) is clamped and matched with the second clamping portion (34).

3. The winding core connection structure according to claim 1, characterized in that: The spacing is set to match the thickness of the tab.

4. The winding core connection structure according to claim 1, characterized in that: The first plate body (31) and the second plate body (32) are both provided with electrolyte circulation holes (33).

5. The winding core connection structure according to claim 1, characterized in that: Notches (222) are formed on both sides of the second connecting portion (22) in the thickness direction, and the notches (222) are used to bend the tabs of the winding core.

6. The winding core connection structure according to claim 1, characterized in that: The conductive member (2) is provided with a positioning portion (23), and the positioning portion (23) is used to cooperate with a welding fixture to limit the position of the conductive member (2).

7. The winding core connection structure according to claim 6, characterized in that: The positioning portion (23) is arranged on a side of the second connecting portion (22) away from the first connecting portion (21), and the positioning portions (23) are arranged on two opposite sides of the second connecting portion (22).

8. The winding core connection structure according to claim 1, characterized in that: The cover plate assembly (1) comprises a lower cover plate (14), an upper cover plate (13) and a pole which are sequentially arranged on the conductive member (2); through holes are provided at relative positions of the conductive member (2), the lower cover plate (14) and the upper cover plate (13); the pole is arranged in the through hole and connected to the conductive member (2).

9. The winding core connection structure according to claim 8, characterized in that: The pole and the through hole are sealed and connected via a sealing ring (16).

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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