Injection molded battery assembly

Abstract

This utility model belongs to the field of injection-molded battery technology, and specifically provides an injection-molded battery assembly. The utility model includes a cell assembly, an injection-molded housing, and a connector wire. The cell assembly includes one or more individual cell units, with elastic sheets attached between the mutually bonded cell units. The cell units and elastic sheets are stacked along the thickness direction. The injection-molded housing forms an injection cavity with an opening. The connector wire has a positioning SR (Self-Locking) clip, which is fixed to the injection-molded housing. The cell assembly and the positioning SR clip are placed within the injection cavity. This utility model, by attaching elastic sheets between the stacked cell units and separately injection-molding the connector wire and battery assembly, greatly improves the battery's waterproofness and drop resistance, meeting the need to use internal cells as external batteries.

Description

Technical Field

[0001] This utility model belongs to the field of battery manufacturing technology, and specifically relates to a fully injection-molded battery with a plug and wire. Background Technology

[0002] With economic development, POS terminals, as multi-functional terminals, enable automatic electronic fund transfers. They support functions such as consumption, pre-authorization, balance inquiry, and transfers, and are safe, fast, and reliable to use. Simultaneously, wireless POS machines have led to increased demand for lithium-ion batteries. The shift from single-cell to multi-cell lithium-ion batteries places higher demands on battery structure and safety performance. Due to the unique nature of the battery compartment in terminal products, existing lithium polymer batteries using metal terminal outputs require connectors for connection. This structure, when subjected to high drop requirements, suffers from insufficient space for cushioning between the connector and terminals, potentially causing power loss and rendering the device unusable.

[0003] Nowadays, customers want to use built-in batteries as external batteries, especially for structures with two or more cells stacked together. Built-in batteries need to meet the reliability and drop protection requirements of external batteries. However, the conventional built-in battery structure is a cell + protection board + FPC + head covering paper structure, which is simple in process and cannot meet the reliability requirements of waterproofing and a drop of 1.5 meters from six sides.

[0004] Therefore, there is an urgent need to invent an injection-molded battery assembly to solve the aforementioned technical problems. Utility Model Content

[0005] The technical problem this invention aims to solve is how to address the issue that existing batteries cannot meet the reliability and waterproofing requirements of external batteries when two or more cells are stacked together.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is to provide an injection-molded battery assembly, characterized in that it includes a cell assembly, an injection-molded shell, and a connector wire; the cell assembly includes one or more individual cell units, with an elastic sheet attached between the mutually bonded cell units, and the cell units and elastic sheets are stacked along the thickness direction; the injection-molded shell encloses an injection cavity with an opening, and the connector wire has a positioning SR wire clip, which is fixed to the injection-molded shell; the cell assembly and the positioning SR wire clip are placed inside the injection cavity. This application can improve the battery's drop resistance and waterproof capability, meeting the customer's requirement to use the built-in battery as an external battery.

[0007] Specifically, the elastic sheet is a PE foam, and one or more of the PE foams are pasted between any two of the battery cell monomers. The PE foam is very light and will not add extra weight, and can well adapt to different shapes and curved surfaces. In addition, it has good compressive resistance, can provide long-term protection for the battery cells, and improve the anti-drop ability of the battery cells.

[0008] More specifically, the shape of the PE foam is a "hui" character shape. The purpose is to provide space for the battery cells to expand after cycling.

[0009] Further, three grooves are respectively distributed on both sides of the injection molded plastic shell along the direction perpendicular to the length direction of the battery cell assembly, and two grooves are vertically distributed at one end far from the plug wire along the thickness direction of the battery cell assembly; and a through hole with the same size as each plug wire is provided at one end of the injection molded plastic shell connected to the plug wire, and the plug wire extends to the outside of the injection molded plastic shell along the through hole. After the injection molding material is filled into the mold cavity, the density of the product is increased by the injection pressure, and at the same time, the adhesion force generated between the product and the surface of the plastic shell plays a good fixing effect on the battery, further enhancing the stability of the internal battery cells.

[0010] Furthermore, a through hole with the same size as each plug wire is provided at one end of the injection molded plastic shell connected to the plug wire, and the plug wire extends to the outside of the injection molded plastic shell along the through hole.

[0011] It should be noted that the SR wire clip is obtained by injecting the plug wire into the SR wire clip injection molded plastic shell. By designing the limiting and fixing structure, it is possible to prevent glue overflow during injection molding, achieve no gap after assembly, and no flash at the wire sealing part.

[0012] Preferably, it further includes a protection board, which is welded to the positive and negative electrodes of the battery cell monomer and is also welded to the plug wire.

[0013] Further, it further includes a rubber pad, which is pasted on the components of the protection board for insulation.

[0014] Furthermore, it further includes a PET insulating sheet, which is pasted on both sides of the entire battery cell assembly in the thickness direction outside. The main function of the PET insulating sheet is to protect the battery cells during glue injection, prevent the battery cells from being damaged and leaking liquid, and then put the previously assembled semi-finished product into the low-pressure injection molded plastic shell for injection molding.

[0015] Preferably, it further includes a label, which is pasted on the outside of the injection molded plastic shell by an automatic labeling machine, and its function is to wrap the battery cell assembly.

[0016] The beneficial effects of this utility model are as follows: This utility model solves the problem that the structure of multiple stacked batteries cannot meet the reliability and waterproof requirements of external batteries. The series batteries after injection molding of this component have good waterproof performance and meet the requirement of a drop of 1.5 meters from six sides, which can meet the drop and waterproof requirements of external batteries. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an exploded view of the injection-molded battery assembly of this utility model;

[0019] Figure 2 This is an isometric view of the injection-molded battery assembly of this utility model;

[0020] Figure 3 This is an assembly drawing of a single cell in an injection-molded battery module according to this utility model.

[0021] Figure 4 This is a detailed drawing of the plug wire for the injection-molded battery assembly of this utility model;

[0022] Figure 5 This is an assembly drawing of the plug wire and injection molded shell of the injection molded battery assembly of this utility model;

[0023] Figure 6 This is a detailed drawing of the injection-molded battery assembly protection plate of this utility model.

[0024] Figure label:

[0025] 1-Battery cell assembly;

[0026] 11-Battery cell; 12-Elastic sheet; 121-PE foam;

[0027] 2-Injection molded shell;

[0028] 21-Injection cavity; 22-Groove; 23-Through hole;

[0029] 3-Plug cable; 31-SR cable clip;

[0030] 4-Protection board;

[0031] 5-Rubber pad;

[0032] 6-PET insulating sheet;

[0033] 7-Label. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] Please refer to Figure 1-6 This utility model provides an injection-molded battery assembly. 1. An injection-molded battery assembly includes a cell assembly 1, an injection-molded housing 2, and a connector 3. The cell assembly 1 includes one or more individual cell units 11, with elastic sheets 12 attached between the mutually bonded cell units 11. The cell units 11 and elastic sheets 12 are stacked along the thickness direction. The injection-molded housing 2 encloses an injection cavity 21 with an opening. The connector 3 has a positioning SR wire clip 31, which is fixed to the injection-molded housing 2. The cell assembly 1 and the positioning SR wire clip 31 are placed inside the injection cavity 21. During the injection molding process, the connector 3 is first placed into the SR wire clip injection-molded housing and injection-molded. Then, the cell units 11 are placed into a laser mold, and an elastic sheet 12 is attached to the front of one cell unit 11. The cell units 11 are then bonded together, with the thickness of multiple cell units 11 stacked. This invention solves the technical problem that conventional built-in battery structures, which consist of a cell + protection board + FPC + head-covered paper, are simple in process but cannot meet the reliability requirements of waterproofing and a 1.5-meter drop from six sides.

[0036] This application incorporates a highly compressible PE foam 121 in the middle of the battery cell. Subsequently, the connector wire 3 and the battery cell assembly 1 are injection molded separately. Through the clamping force of the potting mold and the pressure of the injection molding machine, the thickness of the semi-finished battery is compressed to the same thickness as the mold cavity before potting. After potting, the mixture cools and solidifies, providing cushioning between the battery cell assemblies 1 and between the battery cell assembly 1 and the injection-molded shell 2. By injection molding the battery cell assembly 1, the gaps between the battery cell assemblies 1 and between the battery cell assembly 1 and the injection-molded shell 2 are minimized, thereby improving the internal stability of the battery and enhancing its drop resistance. Furthermore, the injection-molded battery has excellent sealing properties, and the adhesive used in the injection molding has excellent waterproof properties, further improving the battery's waterproofness.

[0037] Further, please refer to Figure 3, the elastic sheet 12 is a PE foam 121, and one or more PE foams 121 are pasted between any two battery cell monomers 11. One or more PE foams are pasted between any two battery cell monomers. The PE foam is very light and does not add extra weight, and can well adapt to different shapes and curved surfaces. In addition, it has good compressive resistance, can provide long-term protection for the battery cells, and improve the anti-drop ability of the battery cells.

[0038] Furthermore, please refer to Figure 3 , the shape of the PE foam 121 is a "return" shape. The purpose of designing this shape is to allow the battery cells to have space for expansion after cycling, and prevent extrusion damage to the inside of the battery cell assembly 1.

[0039] Preferably, please refer to Figure 2 、 5 Note that there are 3 grooves 22 respectively distributed on both sides of the upper edge of the injection plastic shell 2 perpendicular to the length direction of the battery cell assembly 1, and two grooves 22 are vertically distributed at one end far from the plug wire 3 along the thickness direction of the battery cell assembly 1. After the injection molding material is filled into the mold cavity, the pressure of injection molding increases the density of the product, and at the same time, the adhesion force generated between the product and the surface of the plastic shell plays a good fixing effect on the battery, and further enhances the stability of the internal battery cells.

[0040] Further, please refer to Figure 4 One end of the injection plastic shell 2 connected to the plug wire 3 is provided with through holes 23 having the same size as each plug wire, and the plug wire 3 extends to the outside of the injection plastic shell 2 along the through holes 23.

[0041] Further, please refer to Figure 4 , the SR wire clip 31 is obtained by placing the plug wire 3 into the injection plastic shell of the SR wire clip for injection molding. Before the injection molding process of the battery cell assembly 1, first place the plug wire 3 into the injection plastic shell of the SR wire clip 31 for injection molding. Through the fixation of the SR wire clip, the plug wire 3 can be kept neatly arranged, and will not generate offset and swing during the injection molding process, resulting in poor injection molding effect and gaps in the middle. And the SR wire clip 31 can prevent glue overflow during injection molding, so that there is no gap after assembly, and no flash occurs at the wire sealing part.

[0042] It should be noted that in this application, the plug wire is first placed into the injection plastic shell of the SR wire clip for injection molding, and then the battery cell assembly 1 is injected. The reason for separate injection molding is that the compressive resistance and high temperature resistance of the battery are both less than those of the plug wire 3. The material of the injection plastic shell 2 used in the battery cells of this application is a low-pressure injection molding compound, while a higher pressure and temperature environment is required for injecting the plug wire 3, which is not suitable for injection molding together with the battery cells. Therefore, in this application, the plug wire 3 is first injected into the injection plastic shell of the SR wire clip, and then the SR wire clip 31 and the battery cell assembly 1 are jointly placed into the injection cavity 21 for the next injection molding.

[0043] Furthermore, please refer to Figure 6 This battery injection molding assembly also includes a protection plate 4, which is welded to the positive and negative electrodes of the individual battery cell 11 and to the connector wire 3. During the welding process, the protection plate is first placed in the center of the laser welding fixture, then the two battery cells are placed into the laser fixture respectively, and subsequently the protection plate is welded to the positive and negative electrodes of the battery cells.

[0044] For preferred options, please refer to [the following]. Figure 1 , 3 The battery injection molding assembly also includes a rubber pad 5, which is attached to the components of the protection plate 4. Its purpose is to provide insulation from the cell assembly 1.

[0045] Preferably, as shown in the figure, this battery injection molding assembly also includes a PET insulating sheet 6, which is attached to both sides of the entire cell assembly 1 in the thickness direction. The main function of the PET insulating sheet is to protect the cell from damage and leakage during the filling process. The previously assembled semi-finished product is then placed into a low-pressure injection molding shell for injection molding.

[0046] For preferred options, please refer to [the following]. Figure 1 The battery injection molding assembly also includes a label 7, which is affixed to the outside of the injection molding shell using an automatic labeling machine.

[0047] The above are merely specific embodiments of this utility model, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this utility model. Therefore, this utility model is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An injection-molded battery assembly, characterized in that: It includes a battery cell assembly (1), an injection-molded plastic case (2), and a plug wire (3); the battery cell assembly (1) includes one or more battery cell monomers (11), an elastic sheet (12) is pasted between the mutually adhered battery cell monomers (11), and the battery cell monomers (11) and the elastic sheet (12) are stacked in the thickness direction; the injection-molded plastic case (2) encloses to form an injection cavity (21) with an opening, the plug wire (3) has a positioning SR wire clip (31), the positioning SR wire clip (31) is fixed on the injection-molded plastic case (2), and the battery cell assembly (1) and the positioning SR wire clip (31) are placed in the injection cavity (21).

2. The injection-molded battery assembly according to claim 1, characterized in that: The elastic sheet (12) is a PE foam (121), and one or more of the PE foams (121) are pasted between any two adjacent battery cell monomers (11).

3. The injection-molded battery assembly according to claim 2, characterized in that: The shape of the PE foam (121) is "回”-shaped.

4. The injection-molded battery assembly according to claim 3, characterized in that: On both sides of the injection-molded plastic case (2) along the direction perpendicular to the length direction of the battery cell assembly (1), several grooves (22) are respectively distributed, and several grooves (22) are vertically distributed at one end far from the plug wire (3) along the thickness direction of the battery cell assembly (1).

5. The injection-molded battery assembly according to claim 1, characterized in that: One end of the injection-molded plastic case (2) connected to the plug wire (3) is provided with through holes (23) having the same size as each plug wire, and the plug wire (3) extends to the outside of the injection-molded plastic case (2) along the through holes (23).

6. The injection-molded battery assembly according to claim 1, characterized in that: The SR wire clip (31) is obtained by injecting and molding the plug wire (3) into the SR wire clip injection-molded plastic case.

7. The injection-molded battery assembly according to claim 1, characterized in that: It further includes a protection board (4), the protection board (4) is welded to the positive and negative electrodes of the battery cell monomer (11) and is also welded to the plug wire (3).

8. The injection-molded battery assembly according to claim 7, characterized in that: It further includes a rubber pad (5), and the rubber pad (5) is pasted on the components of the protection board (4).

9. The injection-molded battery assembly according to claim 1, characterized in that: It further includes a PET insulating sheet (6), and the PET insulating sheet (6) is pasted on both sides of the outside of the entire battery cell assembly (1) in the thickness direction.

10. The injection-molded battery assembly according to claim 1, characterized in that: It further includes a label (7), and the label (7) is pasted on the outside of the injection-molded plastic case.

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