Injection molding cover plate structure, battery module and battery pack

Abstract

The utility model discloses an injection molding cover plate structure, a battery module and a battery pack, and belongs to the technical field of lithium batteries. The injection molding cover plate structure comprises a base plate assembly, a pressing plate, a rivet and sealant, the base plate assembly comprises a base plate and a stop frame, the stop frame is located on the inner side of the base plate, and the base plate and the stop frame are integrally formed and connected together; the pressing plate is located on the outer side of the base plate. A rivet penetrates through the base plate, one end of the rivet is connected with the pressing plate, and the other end of the rivet is located on the inner side of the base plate; the sealant is located between the substrate and the rivet, and the sealant and the substrate are integrally formed and connected together. The sealant and the substrate are connected together through injection molding. The rivet and the substrate are connected together through injection molding. And the rivet can bear larger current, so that the rate capability of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and more specifically, to an injection-molded cover plate structure, a battery module and a battery pack. Background Art

[0002] Lithium-ion batteries have become the most widely used secondary batteries due to their high energy density, good cycle performance, high operating voltage, and no memory effect. As power batteries, they are widely used in electric vehicles and energy storage fields. The performance and safety requirements of lithium-ion batteries are increasing day by day. The lithium battery cover is an important component in lithium-ion batteries. Its function is to weld with the shell to form a sealed cavity to prevent electrolyte leakage and avoid safety accidents. At the same time, the cover also has the functions of stabilizing the internal pressure of the battery and blocking interference from external substances.

[0003] At present, the shell of lithium-ion batteries is generally made of metal materials (such as aluminum, stainless steel, etc.), and soft-pack batteries use aluminum-plastic composite films as packaging materials. There are also a small number of lithium-ion batteries that use plastic as the shell material, such as JTM batteries. Because it uses a design and process similar to that of lead-acid batteries, its shell material is plastic, and the cover is also made of plastic. However, if the existing pole piece injection molded cover is used, the cross-sectional area of ​​the pole piece is small, which will limit the battery rate performance. Utility Model Content

[0004] The utility model provides an injection-molded cover plate structure, a battery module and a battery pack, which solve the problem that the existing electrode injection-molded cover plate has limitations on the battery rate performance.

[0005] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0006] An injection molded cover plate structure, comprising:

[0007] A base plate assembly, comprising a base plate and a stop frame, wherein the stop frame is located on the inner side of the base plate, and the base plate and the stop frame are integrally formed and connected together;

[0008] A pressing plate, located on the outer side of the base plate;

[0009] A rivet is arranged through the base plate, one end of which is connected to the pressing plate and the other end of which is located on the inner side of the base plate;

[0010] The sealant is located between the base plate and the rivet, and the sealant is integrally formed and connected with the base plate.

[0011] Furthermore, the sealant is connected to the substrate by injection molding.

[0012] Furthermore, the rivet and the base plate are connected together by injection molding.

[0013] Furthermore, the outer side of the pressing plate is irregular in shape.

[0014] Furthermore, the irregular shape includes a first arc side and a second arc side connected to each other.

[0015] Furthermore, a pressing plate groove is provided on a side of the base plate close to the pressing plate, and the pressing plate groove is used to accommodate the pressing plate.

[0016] The utility model also provides a battery module, comprising a plurality of battery cells and the injection molded cover plate structure, wherein each of the battery cells is connected to a pressing plate via the rivets.

[0017] Furthermore, each of the battery modules includes a main positive pressure plate and a main negative pressure plate, and threaded countersunk holes are provided on the main positive pressure plate and the main negative pressure plate, and the threaded countersunk holes are located on a side of the pressure plate away from the base plate.

[0018] The utility model also provides a battery pack, comprising a plurality of the battery modules, wherein a main positive pressure plate of one battery module is connected to a main negative pressure plate of the next battery module.

[0019] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0020] (1) The utility model provides an injection molded cover plate structure, in which the base plate and the stop frame are integrally molded and connected together, thereby simplifying the cover plate manufacturing process; the sealant and the base plate are integrally molded, and there is no need to add an additional sealing ring or sealing gasket for sealing; the rivet and the base plate are connected together by injection molding, and the rivet can withstand a larger current, thereby improving the rate performance of the battery.

[0021] (2) In an injection molded cover plate structure of the utility model, the outer side of the pressure plate is irregularly shaped and a threaded countersunk hole is provided to provide space.

[0022] (3) The utility model provides a battery module and a battery pack, each battery module includes a main positive pressure plate and a main negative pressure plate, the main positive pressure plate and the main negative pressure plate are provided with threaded countersunk holes, the main positive pressure plate of one battery module is connected to the main negative pressure plate of the next battery module, thereby simplifying the series connection method between the battery modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the injection molded cover plate;

[0024] Figure 2 Schematic diagram of the structure when setting threaded countersunk holes for the pressure plate.

[0025] Description of labels:

[0026] 1. Base plate; 11. Pressing plate groove; 12. Stop frame; 2. Pressing plate; 21. Pressing plate through hole; 22. Threaded countersunk hole; 23. First arc side; 24. Second arc side; 3. Sealant; 4. Rivet; 5. Explosion-proof valve hole. DETAILED DESCRIPTION

[0027] The present invention will be described in detail with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0028] like Figure 1 As shown, this embodiment provides an injection molded cover plate structure, which is suitable for batteries with plastic shells and is used in conjunction with plastic shells. It includes a substrate assembly, a pressure plate 2, a rivet 4 and a sealant 3. Specifically, the substrate assembly includes a substrate 1 and a stop frame 12, wherein the stop frame 12 is located on the inner side of the substrate 1, and the substrate 1 and the stop frame 12 are integrally formed and connected together. In this embodiment, the substrate 1 and the stop frame 12 are both made of plastic material, and the substrate 1 and the stop frame 12 are integrally formed and arranged together, which simplifies the structure and manufacturing process of the cover plate.

[0029] The pressure plate 2 is located on the outside of the substrate 1. The rivet 4 is set through the substrate 1, one end is connected to the pressure plate 2, and the other end is located on the inside of the substrate 1. The substrate in the cover plate of this embodiment is used to connect with the battery shell, and the battery cell is placed in the shell. The directional word "inside" refers to the side close to the battery cell, and the directional word "outside" refers to the side away from the battery cell. The end of the rivet 4 located on the inside of the substrate 1 is used to connect with the tab of the battery cell.

[0030] The sealant 3 is located between the substrate 1 and the rivet 4, and the sealant 3 is integrally formed and connected with the substrate 1. The sealant 3 is connected with the substrate 1 by injection molding. The sealant 3 is arranged at a position on the substrate 1 that fits the rivet 4, and is used for sealing between the substrate 1 and the rivet 4. Moreover, the sealant 3 is connected with the substrate 1 by injection molding, so that the sealant 3 is integrally formed with the substrate 1, and there is no need to add a sealing ring or a sealing gasket for sealing, thereby simplifying the structure of the cover plate.

[0031] In this embodiment, the rivet 4 is connected to the substrate 1 by injection molding. The cover structure formed by injection molding the rivet 4 and the substrate 1 is relative to the cover structure formed by injection molding the electrode and the substrate. The rivet 4 can withstand a larger current, thereby improving the rate performance of the battery.

[0032] like Figure 2As shown, the outer side of the pressing plate 2 is irregular in shape. Specifically, the irregular shape includes a first arc side 23 and a second arc side 24 connected to each other, including two first arc side 23 and two second arc side 24, the two first arc side 23 are located at opposite positions, and the two second arc side 24 are located at opposite positions. The outer side of the pressing plate 2 is set to an irregular shape to provide space for opening the threaded countersunk hole 22.

[0033] The pressing plate 2 is also provided with a pressing plate through hole 21 , which is used for connecting with the rivet 4 .

[0034] A pressing plate groove 11 is provided on one side of the base plate 1 close to the pressing plate 2 , and the pressing plate groove 11 is used to accommodate the pressing plate 2 . The side shape of the pressing plate groove 11 matches the outer side shape of the pressing plate 2 .

[0035] An explosion-proof valve hole 5 is also provided on the base plate 1 , and an explosion-proof valve is installed in the explosion-proof valve hole 5 to provide safety protection for the battery.

[0036] The utility model also provides a battery module, including a plurality of battery cells and the injection molded cover plate structure, each battery cell is connected to the pressure plate 2 by a rivet 4. Each battery module includes a main positive pressure plate 2 and a main negative pressure plate 2, and the main positive pressure plate 2 and the main negative pressure plate 2 are provided with threaded countersunk holes 22, and the threaded countersunk holes 22 are located on the side of the pressure plate 2 away from the substrate 1.

[0037] The utility model also provides a battery pack, comprising a plurality of the battery modules, wherein the main positive pressure plate 2 of one battery module is connected to the main negative pressure plate 2 of the next battery module, and the connection can be made through a copper wire. One end of the copper wire is fixed in the threaded countersunk hole 22 of the main positive pressure plate 2 or the main negative pressure plate 2 by screws, which simplifies the series connection between the battery modules and increases the maintainability of the battery modules.

[0038] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. An injection molded cover plate structure, characterized in that: include, A base plate assembly comprises a base plate (1) and a stop frame (12), wherein the stop frame (12) is located on the inner side of the base plate (1), and the base plate (1) and the stop frame (12) are integrally formed and connected together; A pressing plate (2) located outside the base plate (1); A rivet (4) is arranged through the base plate (1), one end of which is connected to the pressing plate (2) and the other end of which is located on the inner side of the base plate (1); The sealant (3) is located between the substrate (1) and the rivet (4), and the sealant (3) and the substrate (1) are integrally formed and connected together.

2. The injection molded cover plate structure according to claim 1, characterized in that: The sealant (3) and the substrate (1) are connected together by injection molding.

3. The injection molded cover plate structure according to claim 1, characterized in that: The rivet (4) and the base plate (1) are connected together by injection molding.

4. The injection molded cover plate structure according to claim 1, 2 or 3, characterized in that: The outer side edge of the pressing plate (2) is irregular in shape.

5. The injection molded cover plate structure according to claim 4, characterized in that: The irregular shape comprises a first circular arc side edge (23) and a second circular arc side edge (24) which are connected to each other.

6. The injection molded cover plate structure according to claim 4, characterized in that: A pressing plate groove (11) is provided on a side of the base plate (1) close to the pressing plate (2), and the pressing plate groove (11) is used to accommodate the pressing plate (2).

7. A battery module, characterized in that: It comprises a plurality of battery cells and the injection molded cover plate structure according to any one of claims 1 to 6, wherein each of the battery cells is connected to the pressing plate (2) via the rivet (4).

8. The battery module according to claim 7, characterized in that: Each of the battery modules comprises a main positive pressure plate (2) and a main negative pressure plate (2), wherein the main positive pressure plate (2) and the main negative pressure plate (2) are provided with threaded countersunk holes (22), and the threaded countersunk holes (22) are located on a side of the pressure plate (2) away from the base plate (1).

9. A battery pack, characterized in that: Comprising several battery modules as claimed in claim 8, the main positive pressure plate (2) of one battery module is connected to the main negative pressure plate (2) of the next battery module.

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