Wound battery

Abstract

The application discloses a winding battery, which comprises a shell and an electrode cover plate, the shell comprises an end plate, the middle part of the end plate protrudes towards the inside of the shell to form a first groove with an opening facing the outside of the shell, the bottom wall of the first groove is provided with a first through hole, the electrode cover plate is arranged in the first groove to cover the first through hole, and the outer periphery of the electrode cover plate is in abutment with the side wall of the first groove to be welded with the side wall of the first groove. According to the winding battery provided by the application, the outer periphery of the electrode cover plate is in abutment with the side wall, so that the welding contact area between the electrode cover plate and the bottom plate is large, and the welding is simple and convenient and has good welding effect in the matched welding mode.

Description

Technical Field

[0001] This invention relates to the field of electronic battery technology, and in particular to a wound battery. Background Technology

[0002] In related technologies, the electrode cover plate and the base plate are overlapped and then welded. The welding laser needs to penetrate the electrode cover plate or the base plate, which requires high laser energy, resulting in high cost. Furthermore, the processing and manufacturing errors in the height direction of the cell cannot be effectively controlled, leading to poor welding on the negative electrode side of the cell, thus affecting the quality of the wound battery. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a wound battery that has good welding performance and low welding cost.

[0004] According to an embodiment of the present invention, a wound battery includes: a housing, the housing including an end plate, the middle portion of the end plate protruding toward the interior of the housing to form a first groove with an opening toward the exterior of the housing, the bottom wall of the first groove being provided with a first through hole; an electrode cover plate disposed in the first groove to cover the first through hole, the outer periphery of the electrode cover plate abutting against the side wall of the first groove to be welded to the side wall of the first groove.

[0005] According to the embodiments of the present invention, the wound battery allows for a large welding contact area between the electrode cover plate and the base plate by having the outer periphery of the electrode cover plate abut against the side wall. Furthermore, this welding method is simple and convenient, and the welding effect is good.

[0006] In some embodiments of the present invention, in the direction from the bottom of the first groove to the opening, the sidewall of the first groove is inclined radially outward toward the housing, so that the cross-sectional area of ​​the first groove gradually increases.

[0007] In some embodiments of the present invention, the outer periphery of the electrode cover is provided with a first folded edge, the first folded edge being parallel to the sidewall of the first groove and fitting together with it.

[0008] In some embodiments of the present invention, a second folded edge and a third folded edge are further connected between the center of the electrode cover plate and the first folded edge, with the second folded edge connecting between the first folded edge and the third folded edge.

[0009] In some embodiments of the present invention, the first folded edge, the second folded edge, and the third folded edge are integrally stamped from the electrode cover plate.

[0010] In some embodiments of the present invention, the wound battery further includes: a battery cell and a current collector, the current collector being mounted at the end of the battery cell, the current collector having a first protrusion structure protruding toward the electrode cover plate in the middle, the first protrusion structure abutting against the electrode cover plate and being welded to the electrode cover plate, wherein the thickness of the electrode cover plate is less than the thickness of the end plate.

[0011] In some embodiments of the present invention, the thickness H1 of the electrode cover plate and the thickness H2 of the end plate satisfy: H1≤2 / 3H2.

[0012] In some embodiments of the present invention, the first protrusion structure is formed by stamping the collector plate.

[0013] In some embodiments of the present invention, the first protrusion structure formed by stamping the current collector has a second groove with an opening facing the inside of the housing, the bottom wall of the second groove has a second protrusion structure protruding towards the inside of the housing, the top wall of the second protrusion structure abuts against the battery cell, and has a second through hole adapted to the electrode post.

[0014] In some embodiments of the present invention, the current collector abuts against the outer periphery of the first through hole, and in the direction from the current collector to the electrode cover plate, the outer peripheral wall of the first protrusion structure is inclined toward the central axis of the battery cell.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a schematic diagram of the structure of a wound battery according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of a wound battery according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 A magnified view of region A in the middle.

[0020] Figure 4 This is a schematic diagram of the current collector of a wound battery according to an embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional view of the current collector of a wound battery according to an embodiment of the present invention.

[0022] Figure 6This is a schematic diagram of the structure of the electrode cover plate of the wound battery according to an embodiment of the present invention.

[0023] Figure 7 This is a cross-sectional view of the electrode cover plate of a wound battery according to an embodiment of the present invention.

[0024] Figure label:

[0025] 100 wound batteries

[0026] Shell 10, bottom plate 101, top plate 102, first through hole 11, first groove 12

[0027] Electrode cover plate 2, first folded edge 21, second folded edge 22, third folded edge 23

[0028] 3. Battery cell; 4. Current collector; 41. First protrusion structure; 42. Second protrusion structure; 43. Second groove.

[0029] 5. Electrode post; 6. Explosion-proof groove; 7. Central tube. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] The following is for reference. Figures 1-7 A wound battery 100 according to an embodiment of the present invention is described.

[0034] The wound battery 100 according to an embodiment of the present invention includes a housing 10 and an electrode cover plate 2. The housing 10 includes an end plate, the middle portion of which protrudes into the housing 10 to form a first groove 12 with an opening facing outward of the housing 10. The bottom wall of the first groove 12 is provided with a first through hole. The electrode cover plate 2 is disposed in the first groove 12 to cover the first through hole. The outer periphery of the electrode cover plate 2 abuts against the side wall of the first groove 12 for welding. The end plate in this application can be a top plate 102 or a bottom plate 101, and is not limited here.

[0035] Reference Appendix Figures 1-3 In a specific example shown, the end plate is the bottom plate 101 of the housing 10. The wound battery 100 includes the housing 10 and the battery cell 3 and the central tube 7 installed in the housing 10. The battery cell 3 is wound around the outer periphery of the central tube 7. The housing 10 includes a top plate 102 and a bottom plate 101. The top plate 102 is provided with a positive terminal mounting hole. The top plate 102 is provided with an explosion-proof groove 6 near the positive terminal mounting hole. The explosion-proof groove 6 is an annular ring surrounding the outer periphery of the positive terminal mounting hole and is radially spaced from the liquid injection hole on the top plate 102.

[0036] The base plate 101 has a first groove 12 with an opening towards the lower end in the middle. The bottom wall of the first groove 12 has a first through hole. The electrode cover plate 2 is placed in the first groove 12 to cover the first through hole. The outer periphery of the electrode cover plate 2 abuts against the side wall of the first groove 12 to be welded to the side wall of the first groove 12.

[0037] Compared to related technologies where the electrode cover plate 2 and the base plate 101 are overlapped and welded, the welding laser needs to penetrate the electrode cover plate 2 or the base plate 101, requiring higher laser energy and thus higher costs. Furthermore, the manufacturing error of the cell 3 in the height direction cannot be effectively compensated, resulting in poor welding on the negative electrode side of the cell 3, which affects the quality of the wound battery 100. In this application, the outer periphery of the electrode cover plate 2 abuts against the side wall, resulting in a larger welding contact area between the electrode cover plate 2 and the base plate 101. Moreover, this welding method is simple and convenient, and the welding effect is better. In addition, the position of the outer periphery of the electrode cover plate 2 abutting against the side wall in the height direction of the cell 3 can be appropriately adjusted, thereby better compensating for the manufacturing error of the cell 3 in the height direction.

[0038] Therefore, in the wound battery 100 according to the embodiment of the present invention, by making the outer periphery of the electrode cover plate 2 abut against the side wall, the electrode cover plate 2 and the base plate 101 have a large welding contact area. Moreover, this welding method is simple and convenient to weld, and the welding effect is good.

[0039] In some embodiments of the present invention, in the direction from the bottom of the first groove 12 to the opening, the sidewall of the first groove 12 is inclined radially outward toward the housing 10, so that the cross-sectional area of ​​the first groove 12 gradually increases. (See attached figure) Figures 2-7 In a specific example shown, the sidewall of the first groove 12 is inclined radially outward toward the housing 10 in the top-to-bottom direction. This makes it easier to define the position of the electrode cover 2 in the top-to-bottom direction. In addition, the larger size of the opening makes it easier for the motor cover to fit into the first groove 12.

[0040] In some embodiments of the present invention, reference is made to the appendix. Figures 2-7 In a specific example, the outer periphery of the electrode cover plate 2 is provided with a first folded edge 21. The first folded edge 21 is parallel to the sidewall of the first groove 12 and fits against each other. Thus, by providing the first folded edge 21, the area for welding between the electrode cover plate 2 and the end plate can be further increased, thereby further improving the welding quality. Furthermore, the sidewall of the first groove 12 and the first folded edge 21 are both parallel to each other and are inclined radially outward towards the housing 10 in the top-to-bottom direction. This facilitates the definition of the position of the electrode cover plate 2 in the top-to-bottom direction.

[0041] In some embodiments of the present invention, reference is made to the appendix. Figures 2-7In a specific example, a second folded edge 22 and a third folded edge 23 are connected between the electrode cover plate 2 and the first folded edge 21, with the second folded edge 22 connecting between the first folded edge 21 and the third folded edge 23. Thus, by providing a structure with multiple folded edges, the structural strength of the electrode cover plate 2 can be significantly improved.

[0042] In some embodiments of the present invention, the first folded edge 21, the second folded edge 22 and the third folded edge 23 are integrally stamped from the electrode cover plate 2, which is simple to operate, convenient to produce and has good structural strength.

[0043] In some embodiments of the present invention, reference is made to the appendix. Figures 2-7 As shown in a specific example, the wound battery 100 also includes: a cell 3 and a current collector 4. The current collector 4 is installed at the end of the cell 3. The middle part of the current collector 4 has a first protrusion structure 41 protruding towards the electrode cover plate 2. The first protrusion structure 41 abuts against the electrode cover plate 2 and is welded to the electrode cover plate 2. The thickness of the electrode cover plate 2 is less than the thickness of the end plate. Therefore, compared with welding the current collector 4 and the end plate by overlapping them vertically, welding the current collector 4 and the electrode cover plate 2 vertically by overlapping them vertically can reduce the penetration thickness of the welding laser, thereby reducing the laser energy and saving costs.

[0044] Furthermore, the thickness H1 of the electrode cover plate 2 and the thickness H2 of the end plate satisfy: H1≤2 / 3H2. This satisfies the structural strength requirements of the electrode cover plate 2 and allows the electrode cover plate 2 to be welded to the collector plate 4.

[0045] Optionally, the first protruding structure 41 is stamped from the collector plate 4, as shown in the reference. Figures 2-7 In one specific embodiment shown, the current collector 4 is stamped to form a first protruding structure 41. The first protruding structure 41 formed by stamping the current collector 4 has a second groove 43 with an opening facing the inside of the housing 10. The bottom wall of the second groove 43 has a second protruding structure 42 protruding towards the inside of the housing 10. The top wall of the second protruding structure 42 abuts against the battery cell 3 and has a second through hole adapted to the electrode post 5. That is, the current collector 4 is stamped integrally formed with the first protruding structure 41 and the second protruding structure 42. In this way, the production difficulty can be reduced and the structural strength can be improved. In addition, the thickness of the first protruding structure 41 formed by stamping the current collector 4 is relatively thin, which can make the first protruding structure 41 better welded to the electrode cover plate 2.

[0046] In some embodiments of the present invention, reference is made to the appendix. Figures 2-7In a specific example, the current collector 4 abuts against the outer periphery of the first through hole, and in the direction from the current collector 4 to the electrode cover plate 2, the outer peripheral wall of the first protrusion structure 41 is inclined toward the central axis of the cell 3. This makes it easy to limit the vertical position of the current collector 4, thereby better defining the relative position between the current collector 4 and the electrode cover plate 2.

[0047] Other configurations and operations of the wound battery 100 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0048] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A wound battery, characterized in that, include: The housing includes an end plate, the middle portion of which protrudes toward the interior of the housing to form a first groove with an opening toward the exterior of the housing, and the bottom wall of the first groove is provided with a first through hole; An electrode cover plate is disposed in the first groove to cover the first through hole. The outer periphery of the electrode cover plate abuts against the side wall of the first groove to be welded to the side wall of the first groove. The battery cell and a current collector are provided. The current collector is mounted at the end of the battery cell. The middle part of the current collector has a first protrusion structure protruding towards the electrode cover plate. The first protrusion structure abuts against the electrode cover plate and is welded to the electrode cover plate. The outer periphery of the electrode cover plate is provided with a first folded edge, which is parallel to the side wall of the first groove and fits against each other.

2. The wound battery according to claim 1, characterized in that, In the direction from the bottom of the first groove to the opening, the sidewall of the first groove is inclined radially outward toward the housing, so that the cross-sectional area of ​​the first groove gradually increases.

3. The wound battery according to claim 1, characterized in that, A second folded edge and a third folded edge are connected between the center of the electrode cover plate and the first folded edge, with the second folded edge connecting between the first folded edge and the third folded edge.

4. The wound battery according to claim 3, characterized in that, The first folded edge, the second folded edge, and the third folded edge are integrally stamped from the electrode cover plate.

5. The wound battery according to claim 1, characterized in that, The thickness of the electrode cover plate is less than the thickness of the end plate.

6. The wound battery according to claim 5, characterized in that, The thickness H1 of the electrode cover plate and the thickness H2 of the end plate satisfy the following condition: H1≤2 / 3H2.

7. The wound battery according to claim 5, characterized in that, The first protrusion structure is formed by stamping the collector plate.

8. The wound battery according to claim 7, characterized in that, The first protruding structure formed by stamping the current collector has a second groove with an opening facing the inside of the housing. The bottom wall of the second groove has a second protruding structure protruding towards the inside of the housing. The top wall of the second protruding structure abuts against the battery cell and has a second through hole adapted to the electrode post.

9. The wound battery according to claim 5, characterized in that, The current collector abuts against the outer periphery of the first through hole, and in the direction from the current collector to the electrode cover plate, the outer peripheral wall of the first protrusion structure is inclined toward the central axis of the cell.

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