Plastic end plate for battery module

Abstract

The utility model discloses a plastic end plate for a battery module, which comprises an injection molding end plate body, an output busbar supporting base is arranged on the upper end face of the injection molding end plate body, an M5 copper nut is embedded in the output busbar supporting base, the upper end of the M5 copper nut is higher than the plane of the injection molding end plate body, and a thread structure is formed on the outer ring of the M5 copper nut. Kidney-shaped holes are formed in the left side and the right side in the injection molding end plate body. The plastic end plate is made of a PC + ABS material, and has the characteristics of low density, high strength and good flame retardance and insulativity through an injection molding integrated forming process; the copper nut is higher than the plastic plane, so that the plastic end plate is prevented from deforming due to long-term heating, and the outer ring of the copper nut is additionally provided with a thread structure to enhance the bonding strength with the plastic end plate; bolting hole positions of the plastic end plates and the box body are designed to be kidney-shaped holes, the length dimensional tolerance of the module can be effectively absorbed, and it is guaranteed that the module is successfully assembled with the box body within the tolerance range.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy battery structure raw materials, in particular to a plastic end plate for a battery module. Background Art

[0002] In recent years, the demand for energy storage power stations, electric vehicles and high-power emergency power supplies has been increasing. As the most basic integrated unit of the entire battery system, the battery module plays a key role in the use, safety and protection of the battery pack. As one of the key material components in the battery module, the module end plate plays a key role in limiting the size of the module, protecting the module from extrusion and impact, connecting the module and the box, and leading out the module output bus.

[0003] There are two main types of end plates for mainstream modules in the market: aluminum extrusion end plates and cast aluminum one-piece end plates, all of which are metal end plates. As important components close to the battery cells, the use of metal end plates poses a major safety hazard, requiring more design and cost to provide insulation and pressure-resistant protection for the end plates. At the same time, the battery module will expand and deform in the later stage, and it is unknown whether the insulation isolation material between the end plate and the battery cell can withstand the test of the squeezing force between the battery cell and the end plate. Secondly, the metal end plate is close to the front panel of the battery box, and there are safety hazards such as small electrical gaps with the busbars, electrical parts and other components. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a plastic end plate for a battery module, which has the advantages of good insulation, light weight, high strength, low cost, etc.

[0005] The utility model is realized by adopting the following technical solutions.

[0006] A plastic end plate for a battery module comprises an injection molded end plate body, an output busbar support base is arranged on the upper end surface of the injection molded end plate body, an M5 copper nut is embedded in the output busbar support base, the upper end of the M5 copper nut is higher than the plane of the injection molded end plate body, and the outer ring of the M5 copper nut forms a threaded structure; waist holes are formed on the left and right sides of the injection molded end plate body.

[0007] Furthermore, the back side of the injection molded end plate body is provided with transverse reinforcing ribs and vertical reinforcing ribs that are staggered in a horizontal and vertical direction.

[0008] Furthermore, the plastic end plate also includes an aluminum alloy sleeve, which is detachably placed in the waist hole of the injection-molded end plate body.

[0009] Furthermore, a lifting hole is formed on the injection-molded end plate body.

[0010] Furthermore, reinforcing ribs are arranged around the lifting holes on the back side of the injection molded end plate body.

[0011] Furthermore, a glue injection hole is formed on the injection-molded end plate body.

[0012] Furthermore, a plurality of module steel belt slots are formed on the front side of the injection-molded end plate body.

[0013] This application has the following beneficial effects.

[0014] (1) The end plate of the utility model is made entirely of plastic except for the inserts, and the contact surfaces with the battery cells, busbars, and electrical parts are all made of plastic, with good insulation and pressure resistance performance;

[0015] (2) The injection-molded end plate of the utility model is lighter in weight, which improves the weight-to-energy density of the battery system;

[0016] (3) The end plate of the utility model has lower unit cost, higher output efficiency and higher yield rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a schematic diagram for illustrating the back structure of the injection-molded end plate body of the utility model;

[0019] Figure 3 It is a structural schematic diagram of an M5 copper nut of the utility model.

[0020] Among them, 1. Output bus support base; 2. M5 copper nut; 3. Aluminum alloy sleeve; 4. Module steel belt slot; 5. Lifting hole; 6. Glue injection hole; 7. Horizontal reinforcement ribs; 8. Vertical reinforcement ribs; 9. Reinforcement ribs at the opening; 10. Threaded structure. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] like Figure 1-3 As shown, a plastic end plate for a battery module is mainly composed of an injection-molded end plate body, an M5 copper nut 2, and an aluminum alloy sleeve 3.

[0023] The injection-molded end plate body includes an output busbar support base 1, a module steel belt slot 4, a lifting hole 5, a glue injection hole 6, a transverse reinforcement rib 7, a vertical reinforcement rib 8 and a reinforcement rib 9 at the opening, all of which are injection-molded in one piece, and the material is PC+ABS, with a withstand voltage insulation performance requirement of 10kV, and a flame retardant grade of UL94-V0. Compared with traditional metal end plate materials such as aluminum profiles and cast aluminum, this material has the advantages of light weight, low cost, no need for additional insulation and withstand voltage treatment, and integrated with the busbar support base.

[0024] The output bus support base 1 is arranged on the upper end surface of the injection molded end plate body; a plurality of module steel belt slots 4 are arranged at intervals on the front side of the injection molded end plate body for embedding the module steel belt; the lifting hole 5 and the glue injection hole 6 pass through the injection molded end plate body, the glue injection hole 6 is located in the module steel belt slot 4, and the lifting hole 5 is located outside the module steel belt slot 4. After the end plate body is injection molded, the lifting hole 5 and the glue injection hole 6 are processed by machining technology, and the lifting hole 5 can be used in conjunction with the module hoist for lifting; the transverse reinforcement ribs 7 and the vertical reinforcement ribs 8 are arranged on the back side of the injection molded end plate body in a grid shape, which are used to increase the mechanical strength of the end plate body. By setting the reinforcement ribs, the tensile strength of the plastic end plate of the present application is ≥56Mpa, and the bending strength is ≥89Mpa. When the expansion force reaches a maximum of 30kN at the end of the life of the battery module, the end plate will not be deformed; the reinforcement ribs 9 at the opening are arranged around the lifting hole 5, which are used to strengthen the mechanical strength of the end plate body around the lifting hole 5 to meet the lifting mechanics requirements.

[0025] The present application forms waist holes on the left and right sides of the injection-molded end plate body, and the bolt connection holes between the plastic end plate and the box body are designed in the shape of waist holes, which can effectively absorb the length dimension tolerance of the module and ensure that the module is successfully assembled with the box body within the tolerance range.

[0026] One end of the M5 copper nut 2 is embedded in the output bus support base 1, and the other end is bolted to the module output bus. More specifically, the exposed surface of the M5 copper nut 2 should be higher than the plane of the injection molded end plate substrate to prevent the bus from contacting the substrate, causing the substrate to deform due to long-term overcurrent heating, increasing the contact resistance, and further increasing the heat generation.

[0027] A threaded structure 10 is formed on the outer ring of the M5 copper nut 2 of the present application. After the copper nut and the end plate body are integrally injection molded, the threaded structure 10 of the outer ring of the copper nut can enhance the mutual bite force between the copper nut and the injection-molded end plate body, enhance the torque value, and ensure that no relative rotation occurs during the bolt tightening process.

[0028] The present application can optionally use an aluminum alloy sleeve 3, which is used in conjunction with the injection molded end plate body and can be detachably placed in the waist hole of the injection molded end plate body. Before assembling the module and the box body, the aluminum alloy sleeve 3 is placed inside the waist hole of the injection molded end plate. While the waist hole absorbs the length dimension tolerance of the module, the aluminum alloy sleeve 3 can effectively prevent the injection molded end plate body from being deformed due to the bolt locking force.

[0029] The plastic end plate of the utility model has the advantages of light weight, high strength, good insulation, low cost and the like, and can be used as a substitute product for aluminum alloy end plates and cast end plates of battery modules.

[0030] The embodiments of this specific implementation method are all preferred embodiments of the utility model, and are not intended to limit the protection scope of the utility model. Therefore, all equivalent changes made based on the structure, shape, and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A plastic end plate for a battery module, characterized in that: It comprises an injection molded end plate body, an output busbar support base (1) is provided on the upper end surface of the injection molded end plate body, an M5 copper nut (2) is embedded in the output busbar support base (1), the upper end of the M5 copper nut (2) is higher than the plane of the injection molded end plate body, and the outer ring of the M5 copper nut (2) forms a threaded structure (10); waist holes are formed on the left and right sides of the injection molded end plate body.

2. The plastic end plate for a battery module according to claim 1, characterized in that: The back side of the injection molded end plate body is provided with transverse reinforcing ribs (7) and vertical reinforcing ribs (8) that are staggered in a horizontal and vertical direction.

3. The plastic end plate for a battery module according to claim 1, characterized in that: The plastic end plate further comprises an aluminum alloy sleeve (3), which is detachably placed in the waist hole of the injection-molded end plate body.

4. The plastic end plate for a battery module according to claim 1, characterized in that: A lifting hole (5) is formed on the injection-molded end plate body.

5. The plastic end plate for a battery module according to claim 4, characterized in that: Hole-opening reinforcing ribs (9) are arranged around the lifting hole (5) on the back side of the injection-molded end plate body.

6. The plastic end plate for a battery module according to claim 1, characterized in that: A glue injection hole (6) is formed on the injection-molded end plate body.

7. The plastic end plate for a battery module according to claim 1, characterized in that: A plurality of module steel belt slots (4) are formed on the front side of the injection-molded end plate body.

Images