A battery cell assembly structure and a USB rechargeable battery using the same

Abstract

The present invention discloses a battery cell assembly structure and a rechargeable battery using the structure, including a positive electrode assembly, a protection circuit board and a battery cell. The battery cell adopts a rigid pole pin, a socket is provided on the protection circuit board, and a jack matched with the pole pin is provided on the socket. The pole pin and the jack are closely matched to form an electrical connection so that the battery cell is electrically connected to the socket. The positive electrode assembly includes a positive pole cap and a protection board support structure, and the protection circuit board is arranged on the protection board support structure. By adopting the above structure, after the production and testing of the protection circuit board is completed, it only needs to be directly inserted into the battery cell to complete the assembly. The assembly is simple and convenient to realize production automation, and the reliability of the product can be guaranteed at the same time. This solution solves the connection problem between the battery cell and the protection circuit board and the metal shell, and can effectively reduce the product cost and the unsafe hidden dangers caused by manual welding. The USB battery provided by this solution has better performance.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery core assembly structure and a USB rechargeable battery using the same. Background Art

[0002] As a common daily necessity, batteries are widely used in various devices, such as toys, keyboards and mice, remote controls, cameras, model airplanes, flashlights, electronic door locks, electronic clocks and other products. The batteries on the market mainly include disposable carbon batteries, alkaline batteries, and rechargeable nickel-manganese, nickel-chromium, and nickel-metal hydride batteries. With the increasing maturity of lithium battery technology and its advantages such as high energy density, fast charging, environmental protection, and no memory effect, lithium rechargeable batteries have gradually appeared in the market and become a popular trend.

[0003] The existing lithium rechargeable battery structure with built-in USB interface is composed of battery cells, protection and voltage conversion circuit boards (collectively referred to as protection circuit boards), shells and other components. The battery cells are packaged in soft packages or metal shells, and the protection board is composed of lithium battery protection circuits, voltage conversion circuits, and charging management circuits. The electrical connection between the battery cells and the protection circuit board is welded. This method brings great trouble to production and manufacturing, with low production capacity, high cost, and it is easy to have poor welding and short circuits. Summary of the invention

[0004] The purpose of the present invention is to provide a battery core assembly structure and a USB rechargeable battery using the structure, which can solve the above-mentioned technical problems existing in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery cell assembly structure is provided, including a positive electrode assembly, a protection circuit board and a battery cell, the battery cell adopts a rigid pole pin, the protection circuit board is provided with a socket, the socket is provided with a jack matching the pole pin, the pole pin and the jack are tightly matched to form an electrical connection so that the battery cell is electrically connected to the socket, the positive electrode assembly includes a positive pole cap and a protection board support structure, and the protection circuit board is arranged on the protection board support structure.

[0007] As an optimal technical solution for the battery cell assembly structure, the protection plate support structure is detachably connected to the protection circuit board, and the protection plate support structure includes a support body in a cylindrical structure, and a through hole for installing the protection circuit board is arranged inside the support body. The protection circuit board passes through the through hole, one end of which is connected to the pole pin of the battery cell, and the other end is connected to the positive pole.

[0008] As a preferred technical solution of the battery cell assembly structure, the socket includes a socket body, the socket body is provided with the jack at the end facing the battery cell, the socket body is provided with a lead at the end away from the jack, and the pole needle is electrically connected to the protection circuit board through the lead after being tightly fitted with the jack.

[0009] As a preferred technical solution for the battery cell assembly structure, a negative grounding plate is provided on the protection circuit board, and the negative grounding plate is made of a metal spring sheet. The negative grounding plate has a first grounding plate end electrically connected to the protection circuit board and a second grounding plate end away from the protection circuit board. When the protection circuit board is installed in a metal shell, the second end of the grounding plate abuts against the metal shell.

[0010] As a preferred technical solution of the battery cell assembly structure, an annular boss is arranged outside the support body, and in the assembled state, the annular boss is located between the positive electrode cap and the metal shell to relatively insulate the positive electrode cap and the metal shell.

[0011] As a preferred technical solution of the battery cell assembly structure, it also includes a metal shell for installing the battery cell, the metal shell is a cylindrical structure with one end closed, and the open end of the metal shell encapsulates the battery cell through an explosion-proof plug.

[0012] As a preferred technical solution to the battery cell assembly structure, the explosion-proof plug is fixedly connected to the metal shell, and the explosion-proof plug includes an explosion-proof plug body, and the explosion-proof plug body has a pressure relief portion whose strength is weaker than that of the explosion-proof plug body, and two ends of the pressure relief portion are respectively connected to the inside of the metal shell and the outside of the metal shell.

[0013] As a preferred technical solution for the battery cell assembly structure, the positive electrode cap and the protection plate support structure are an integrated structure and are integrally formed by in-mold injection molding.

[0014] On the other hand, a USB rechargeable battery is provided, which uses the battery cell assembly structure as described above to assemble the battery cells.

[0015] The beneficial effects of the present invention are as follows: by adopting the above structure, after the production and testing of the protection circuit board is completed, it only needs to be directly inserted into the battery cell to complete the assembly, and the simple assembly facilitates the realization of production automation, while ensuring the reliability of the product. This solution solves the connection problem between the battery cell, the protection circuit board and the metal shell, and can effectively reduce the product cost and the unsafe hidden dangers caused by manual welding. The USB battery provided by this solution has better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described in detail below based on the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the exploded structure of the battery cell, metal shell and explosion-proof plug according to an embodiment of the present invention.

[0018] Figure 2 This is a cross-sectional view of the battery structure described in an embodiment of the present invention.

[0019] Figure 3 This is a cross-sectional view of the structure of the battery described in an embodiment of the present invention from another perspective.

[0020] Figure 4 for Figure 3 Enlarged view of point I in the middle.

[0021] Figure 5 This is a schematic diagram of a battery disassembled state according to an embodiment of the present invention.

[0022] In the figure:

[0023] 1. Positive electrode assembly; 2. Protection circuit board; 3. Battery cell; 4. Pole needle; 5. Socket; 6. Protection board support structure; 7. Support body; 8. Socket body; 9. Socket; 10. Lead wire; 11. Negative grounding plate; 12. Annular boss; 13. Metal shell; 14. Explosion-proof plug. DETAILED DESCRIPTION

[0024] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] like Figures 1 to 5 As shown, in this embodiment, a battery cell assembly structure described in the present invention includes a positive electrode component 1, a protection circuit board 2 and a battery cell 3, the battery cell 3 adopts a rigid pole needle 4, the protection circuit board 2 is provided with a socket 5, the socket 5 is provided with a jack 9 matching the pole needle 4, the pole needle 4 and the jack 9 are tightly matched to form an electrical connection so that the battery cell 3 is electrically connected to the socket 5, the positive electrode component 1 includes a positive electrode cap and a protection board support structure 6, and the protection circuit board 2 is arranged on the protection board support structure 6.

[0028] By adopting the above structure, after the production and testing of the protection circuit board 2 is completed, it only needs to be directly inserted into the battery cell 3 to complete the assembly. The simple assembly facilitates the realization of production automation and can ensure the reliability of the product. This solution solves the connection problem between the battery cell 3, the protection circuit board 2 and the metal shell, and can effectively reduce product costs and unsafe risks caused by manual welding.

[0029] In order to improve the stability of the protection circuit board 2, a protection board support structure 6 is provided in the embodiment of the present scheme to support the protection circuit board 2. The connection method and relative position relationship between the protection board support structure 6 and the protection circuit board 2 can be in various forms. In the present embodiment, the protection board support structure 6 and the protection circuit board 2 are detachably connected.

[0030] Specifically, in this embodiment, the protection board support structure 6 includes a support body 7 in a cylindrical structure, and a through hole for installing the protection circuit board 2 is arranged inside the support body 7. The protection circuit board 2 passes through the through hole and is connected to the pole needle 4 of the battery cell 3 at one end, and is connected to the positive pole at the other end.

[0031] In this solution, the metal shell 13 is connected to the negative electrode of the battery cell 3 to form the negative electrode of the battery, and the positive electrode column is provided on the protection circuit board 2, and the positive electrode column is electrically connected to the positive electrode of the battery cell 3 to form the positive electrode of the battery. The positive electrode column on the protection circuit board 2 passes through the through hole on the support body 7 and extends to the outside of the support body 7.

[0032] The socket 5 includes a socket body 8, the socket body 8 is provided with the socket 9 at the end facing the battery core 3, and the socket body 8 is provided with a lead 10 at the end away from the socket 9. The pole needle 4 is electrically connected to the protection circuit board 2 through the lead 10 after being tightly matched with the socket 9.

[0033] In this solution, a socket 5 is provided on the protection circuit board 2, so that the positive and negative electrodes of the battery cell 3 can be electrically connected to the protection circuit board 2 by plugging into the socket 5. Compared with the welding structure, it can effectively improve the work efficiency, better ensure the product qualification rate, and reduce the production cost.

[0034] A negative grounding plate 11 is provided on the protection circuit board 2. The negative grounding plate 11 is made of a metal spring sheet. The negative grounding plate 11 has a first grounding plate end electrically connected to the protection circuit board 2 and a second grounding plate end away from the protection circuit board 2. When the protection circuit board 2 is installed in the metal shell 13, the second end of the grounding plate abuts against the metal shell 13.

[0035] In this solution, grounding is achieved by providing a negative electrode grounding sheet 11 supported by a metal spring sheet and abutting against the metal shell 13, which can effectively reduce the contact resistance and ensure reliable contact.

[0036] Specifically, in this embodiment, an annular boss 12 is disposed outside the support body 7 , and in the assembled state, the annular boss 12 is located between the positive electrode cap and the metal shell 13 to insulate the positive electrode cap from the metal shell 13 .

[0037] This embodiment further includes a metal shell 13 for mounting the battery cell 3, the metal shell 13 is a cylindrical structure with one end closed, and the open end of the metal shell 13 encapsulates the battery cell 3 through an explosion-proof plug 14. The explosion-proof plug 14 is fixedly connected to the metal shell 13, and the explosion-proof plug 14 includes an explosion-proof plug body, and the explosion-proof plug body has a pressure relief portion with a strength weaker than that of the explosion-proof plug body, and the two ends of the pressure relief portion are respectively connected to the inside of the metal shell 13 and the outside of the metal shell 13.

[0038] In other embodiments, the positive electrode cap and the protection plate support structure 6 may also be an integral structure, and are integrally formed by in-mold injection molding.

[0039] In other embodiments of the present invention, a battery cell assembly structure is also provided, including a positive electrode assembly, a protection circuit board and a battery cell, the battery cell adopts a rigid pole needle, the positive electrode assembly includes a positive electrode cap and a protection board support structure, the protection circuit board is arranged on the protection board support structure, and the pole needle is electrically connected to the protection circuit board by welding.

[0040] Meanwhile, this embodiment also provides a USB rechargeable battery, which uses the battery cell assembly structure as described above to assemble the battery cell 3 .

[0041] In the description herein, it should be understood that the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0043] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0044] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A battery cell assembly structure, characterized in that , including a positive electrode assembly, a protection circuit board and a battery cell, the battery cell adopts a rigid pole needle, a socket is provided on the protection circuit board, a jack is provided on the socket to match the pole needle, the pole needle and the jack are closely matched to form an electrical connection so that the battery cell is electrically connected to the socket, the positive electrode assembly includes a positive electrode cap and a protection board support structure, and the protection circuit board is arranged on the protection board support structure; The socket comprises a socket body, the socket body is provided with the jack at the end facing the battery core, the socket body is provided with a lead at the end away from the jack, and the pole needle is electrically connected to the protection circuit board through the lead after being tightly matched with the jack; It also includes a metal shell for installing the battery core, the metal shell is a cylindrical structure with one end closed, and the open end of the metal shell is used to encapsulate the battery core through an explosion-proof plug.

2. The battery cell assembly structure according to claim 1, characterized in that: The protection plate support structure is detachably connected to the protection circuit board, and the protection plate support structure includes a support body in a cylindrical structure. A through hole for installing the protection circuit board is arranged inside the support body. The protection circuit board passes through the through hole and is connected to the pole needle of the battery cell at one end, and is connected to the positive pole at the other end.

3. The battery cell assembly structure according to claim 2, characterized in that: A negative grounding plate is provided on the protection circuit board. The negative grounding plate is made of a metal spring sheet. The negative grounding plate has a first grounding plate end electrically connected to the protection circuit board and a second grounding plate end away from the protection circuit board. When the protection circuit board is installed in a metal shell, the second end of the grounding plate abuts against the metal shell.

4. The battery cell assembly structure according to claim 2, characterized in that: An annular boss is disposed outside the support body, and in an assembled state, the annular boss is located between the positive electrode cap and the metal shell so that the positive electrode cap and the metal shell are relatively insulated.

5. The battery cell assembly structure according to claim 1, characterized in that: The explosion-proof plug is fixedly connected to the metal shell and includes an explosion-proof plug body having a pressure relief portion whose strength is weaker than that of the explosion-proof plug body. Two ends of the pressure relief portion are respectively connected to the inside of the metal shell and the outside of the metal shell.

6. The battery cell assembly structure according to claim 1, characterized in that: The positive electrode cap and the protection plate support structure are an integrated structure and are integrally formed by in-mold injection molding.

7. A USB rechargeable battery, characterized in that: The battery cell assembly structure according to any one of claims 1 to 6 is used to assemble the battery cells.

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