Battery module end plate structure

Abstract

A battery module end plate structure belongs to the technical field of battery module manufacturing, and adopts the specific scheme that the battery module end plate structure comprises an end plate body and an insulating seat, a cuboid I is cut from the left end and the right end of the top of the end plate body from top to bottom, and is bent outwards by 90 degrees to form a fixed plate I integrally connected with the end plate body; the insulating seat is detachably and fixedly arranged on the fixing plate I; a cuboid II is cut in the middle of the end plate body and bent outwards by 90 degrees to form a fixing plate II integrally connected with the end plate body, the two ends of the fixing plate II are bent upwards by 90 degrees to form positioning plates, positioning holes I are formed in the two positioning plates, a plurality of U-shaped grooves with outward openings are formed in the middle of the fixing plate II, and the U-shaped grooves are communicated with the U-shaped grooves. The left side and the right side of the end plate body are both bent inwards by 90 degrees to form protection plates. The integral structure and the connecting mode of the end plate are simplified, mold opening is not needed, machining is easy, the production process is simple, no special equipment requirement exists, and cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery module manufacturing technical field, concretely relates to a battery module end plate structure. BACKGROUND

[0002] As the power core component of power battery system, energy storage system, communication system, civil system and the like, the importance of the electrical performance and safety of the battery module is self-evident, and the battery module is mainly composed of battery cell, end plate, side plate, ribbon or steel belt, aluminum row, structural adhesive and the like, wherein the end plate directly affects the assembly of the battery module, and with the development of the industry, more and more researches are made on the end plate, and the cost is pursued more extreme without affecting the structural strength and function.

[0003] At present, the conventional end plate in the industry includes cast aluminum end plate, extruded aluminum end plate, plastic embedded aluminum end plate, plastic end plate and sheet metal end plate, wherein the cast aluminum end plate, extruded aluminum end plate, plastic embedded aluminum end plate and plastic end plate need to be opened, and the manufacturing process is relatively complex and the cost is relatively high, and the sheet metal end plate is basically formed by directly bending the SPCC and SGCC sheet metal, the structure is simple, the cost is low, and the strength and function of the end plate are not lost. The sheet metal end plate in the industry is usually welded, and the defects are as follows: first, a certain number of defects such as cracks, pores, slag inclusion, incomplete penetration and incomplete fusion exist in the welded joint, which reduces the strength, causes stress concentration and damages the compactness of the weld. Second, the welded structure is easy to cause large residual deformation and welding internal stress. Since most welding methods are local heating, the welded part will inevitably produce stress and deformation in the structure after welding, thereby affecting the structural load capacity, machining precision and dimensional stability, in addition, stress concentration will also occur at the junction of the weld and the welded part, affecting the brittle fracture of the structure. Third, high temperature, strong light and some toxic gases will be generated during the welding process, which will cause certain harm to the human body, and labor protection needs to be strengthened. Fourth, the welded joint has large performance non-uniformity, because the composition and metallographic structure of the weld are different from those of the base material, and the heat cycle of each part of the joint is different, so the performance of the joint in different areas is different. Fifth, the sharp welding area at the contact surface with the battery assembly is easy to pierce the outer surface of the battery, resulting in that the battery pressure resistance cannot pass. CONTENT OF THE UTILITY MODEL

[0004] In view of the technical problems that the existing battery module assembly process is complex and difficult, the utility model provides a battery module end plate structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a kind of battery module end plate structure, including end plate body and insulating seat, the top of the end plate body both ends from top to bottom cuts cuboid I and is bent 90 ° outward to form fixed plate I integrally connected with end plate body, the insulating seat is detachably fixed on fixed plate I;The middle part of the end plate body cuts a cuboid II and is bent 90 ° outward to form fixed plate II integrally connected with end plate body, the both ends of the fixed plate II are bent 90 ° upward to form positioning plate, and positioning hole I is formed in the both positioning plates, and the middle part of the fixed plate II is provided with a plurality of U-shaped grooves one with opening direction outward, and the both sides of the end plate body are bent 90 ° inward to form guard plate.

[0007] Further, the both ends of each fixed plate I are bent 90 ° upward to form limiting plate I.

[0008] Further, at least one positioning hole II is formed in the fixed plate I, and at least one positioning protrusion is arranged on the bottom surface of the insulating seat, and the positioning protrusion is matched with the positioning hole II.

[0009] Preferably, if the fixed plate II is located above the rectangular through hole formed after cutting the cuboid II, a reinforcing plate is arranged on the upper surface of the fixed plate II; if the fixed plate II is located below the rectangular through hole, a reinforcing plate is arranged on the lower surface of the fixed plate II; the reinforcing plate is composed of a 'L'-shaped rib plate I and a rib plate II which are perpendicular to each other, the rib plate I is welded with the end plate body, the rib plate II is welded with the fixed plate II, and a plurality of U-shaped grooves two corresponding to the U-shaped grooves one formed on the fixed plate II are arranged on the rib plate II.

[0010] Further, a limiting plate II is arranged on the upper surface of the outer side wall of the insulating seat in the same plane as the outer side wall.

[0011] Preferably, the bottom of the both sides of the end plate body is cut at an angle.

[0012] Further, an extension plate is arranged on the top of the end plate body, and the extension plate is in the same plane as the end plate body and is integrally connected with the end plate body.

[0013] Further, at least one groove is punched on the end plate body, and the groove includes one or more combinations of long strip shape, circular shape and square shape.

[0014] Further, an insulating film is arranged between the end plate body and the internal battery cell.

[0015] Further, a plurality of U-shaped cutting seams are cut at the bending line of the end plate body and the guard plate, and after the guard plate is bent to form the guard plate, a groove structure is formed on the guard plate, and a limiting block is formed on the end plate body corresponding to the groove structure.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The battery module end plate structure described in this utility model achieves the strength, function, and fixed connection to external structures through sheet metal bending, stamping, and welding. This simplifies the overall structure and connection method of the end plate, eliminates the need for mold opening, makes processing easy, simplifies the production process, requires no special equipment, and results in low cost. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the outer wall structure of the battery module end plate;

[0019] Figure 2 This is a schematic diagram of the inner wall structure of the battery module end plate.

[0020] Figure 3 This is a schematic diagram of the battery module structure;

[0021] In the diagram, 1. End plate body, 2. Insulating seat, 3. Fixing plate I, 4. Fixing plate II, 5. Positioning plate, 6. Positioning hole I, 7. U-shaped groove, 8. Protective plate, 9. Limiting plate I, 10. Positioning hole II, 11. Rectangular through hole, 12. Reinforcing plate, 13. Chamfer, 14. Extension plate, 15. Groove, 16. Battery cell, 17. Groove structure, 18. Limiting block, 19. Bundling strap, 20. Series aluminum busbar, 21. Limiting plate II, 22. Limiting hole, 23. Insulating film, 121. Rib plate I, 122. Rib plate II. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the protection scope of this utility model.

[0023] Example 1:

[0024] A battery module end plate structure includes an end plate body 1 and an insulating base 2. The top left and right ends of the end plate body 1 are both cut into cuboids I from top to bottom and bent outwards at 90° to form a fixing plate I3 integrally connected to the end plate body 1. The insulating base 2 is detachably fixedly mounted on the fixing plate I3. A cuboid II is cut from the middle of the end plate body 1 and bent outwards at 90° to form a fixing plate II4 integrally connected to the end plate body 1. Both ends of the fixing plate II4 are bent upwards at 90° to form positioning plates 5. The folding sequence can be adjusted according to actual needs. Positioning holes I6 are provided on both positioning plates 5. Several U-shaped grooves 7 with outward openings are provided in the middle of the fixing plate II4. The left and right sides of the end plate body 1 are bent inwards at 90° to form protective plates 8. The protective plates 8 prevent the battery cell 16 from deforming and breaking under the force of the binding strap 19, thus avoiding the risk of short circuits due to bending of the internal electrode plates of the battery cell 16. They also protect the corners of the battery cell 16 from contacting other components, thus preventing interference with the insulation withstand voltage test of the battery cell 16. The fixing plate II4 is used to fix the battery cell module in subsequent processes. Bolts are used to pass through the U-shaped grooves to install and fix the battery cell module to the external chassis. The positioning holes I6 facilitate the handling of the module in subsequent processes and automated production line operations. The insulating base 2 is provided with limiting holes 22, and copper nuts are embedded in the limiting holes 22. These are mainly used to fix and position the series aluminum busbars 20 in the battery cell module, so that the battery cell module can be connected to the external power output through the series aluminum busbars 20. This prevents the battery cell module from directly contacting metal while energized, which could lead to short circuits, electric shocks, and fire risks. The gap between the fixing plate I3 and the fixing plate II4 serves as a limiting strap 19, which is ingeniously designed and facilitates subsequent processes.

[0025] Furthermore, each of the fixed plates I3 has its left and right ends bent upwards by 90° to form a limiting plate I9, and the insulating seat 2 is fixed between the two limiting plates I9. The bending sequence of the fixed plates I3 can be adjusted according to requirements.

[0026] Furthermore, the fixing plate I3 is provided with at least one positioning hole II10, and the bottom surface of the insulating base 2 is provided with at least one positioning protrusion, which is matched with the positioning hole II10 for positioning and installation of the insulating base 2.

[0027] Furthermore, if the fixing plate II4 is located above the rectangular through hole 11 formed after cutting a piece of the cuboid II, a reinforcing plate 12 is provided on the upper surface of the fixing plate II4. If the fixing plate II4 is located below the rectangular through hole 11, a reinforcing plate 12 is provided on the lower surface of the fixing plate II4. The reinforcing plate 12 is composed of mutually perpendicular L-shaped ribs I 121 and II 122. Rib I 121 is welded to the end plate body 1, and rib II 122 is welded to the fixing plate II4. Rib II 122 is provided with several U-shaped grooves II corresponding to the U-shaped grooves I 7 opened on the fixing plate II4. The function of the reinforcing plate 12 is to strengthen the load-bearing capacity of the fixing plate II4. The reinforcing plate 12 can be thickened or removed according to the weight requirements of the module without affecting the overall end plate structure.

[0028] Furthermore, a limiting plate II 21, which is on the same plane as the outer side wall, is provided on the upper surface of the outer side wall of the insulating base 2. Since the battery cell module, when energized, will form a path through the series aluminum busbar 20, this prevents the battery cell module from entering the next process, such as the chassis, and prevents external metal objects from contacting the series aluminum busbar 20, thus avoiding the risk of short circuits, electric shocks, and fires.

[0029] Furthermore, the bottom of the left and right sides of the end plate body 1 is cut with chamfers 13. When bent into a protective plate 8, the bottom is hollowed out. When the module enters the chassis of the subsequent process, it prevents the sharp corners of the bottom of the end plate body 1 from scratching or damaging the protective layer of the chassis, which would cause oxidation of the scratched area of ​​the chassis and failure to pass the insulation withstand voltage test (insulation withstand voltage test instructions: According to the industry test standard YD / T 2344.1, the national standard requirements of GB 38031, and the industry and national standards such as GB_T 31485, the battery pack needs to be tested for different DC voltage withstand voltages), which would affect the product quality of the downstream process.

[0030] Furthermore, an extension plate 14 is provided on the top of the end plate body 1. The extension plate 14 is in the same plane as the end plate body 1 and is integrally connected to the end plate body 1. The extension plate 14 can be adjusted according to the height of the battery cell 16, which serves to protect the battery cell 16 and also to transmit force to the end plate body 1.

[0031] Furthermore, at least one groove 15 is stamped on the end plate body 1. The groove 15 includes one or more combinations of elongated, circular, square, or other stamped shapes. Its function is to strengthen the end plate and also to transmit localized reinforcing force. Preferably, the groove 15 is an elongated groove, with three grooves arranged horizontally from top to bottom, and the strapping 19 is located between two adjacent elongated grooves. The opening direction of the stamped groove 15 is either inward or outward. When the opening direction of the groove 15 is outward, the two elongated grooves serve to limit the strapping 19.

[0032] Furthermore, several U-shaped cuts are made at the bending line of the end plate body 1 and the guard plate 8. After bending to form the guard plate 8, the guard plate 8 presents a groove structure 17. The end plate body 1 presents a limiting block 18 at the position corresponding to the groove structure 17. The position of the limiting block 18 is at the same height as the position of the long strip groove. When the battery cells 16 are assembled, the strapping 19 is set between two adjacent long strip grooves and the limiting block 18 to facilitate battery module assembly and prevent the strapping 19 from shifting and being subjected to uneven force.

[0033] Before bending the end plate body 1 and the guard plate 8, first cut the U-shaped cut seam at the bending line between the end plate body 1 and the guard plate 8 and the chamfer 13 at the bottom of the end plate body 1. Then bend it on the sheet metal bending machine. This structure is simple and easy to implement and can realize the functions of module protection and subsequent assembly protection.

[0034] Furthermore, an insulating film 23 is provided between the end plate body 1 and the internal battery cell 16 to prevent the battery cell 16 from directly contacting the end plate body 1, and to prevent the battery cell 16 from being punctured by rough surfaces or foreign metal objects on the end plate body 1. It also ensures the insulation withstand voltage of the module. The insulating film 23 is made of one of PC, ABS, PP, and PE, or other existing insulating materials.

[0035] The insulating base 2 is made of one or more of PC, ABS, PA66, and GF, or other existing insulating materials.

[0036] The battery module end plate structure relies on the bending, stamping and welding of a sheet metal to achieve the strength, function and external fixed connection of the end plate, which simplifies the overall structure and connection method of the end plate, eliminates the need for mold opening, makes processing easy, simplifies the production process, requires no special equipment, and has low cost.

[0037] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery module end plate structure, characterized in that: The end plate body (1) and the insulating seat (2) are included. The top left and right ends of the end plate body (1) are cut from top to bottom into a cuboid I and bent outward at 90° to form a fixed plate I (3) integrally connected with the end plate body (1). The insulating seat (2) is detachably fixed on the fixed plate I (3). The middle part of the end plate body (1) is cut into a cuboid II and bent outward at 90° to form a fixed plate II (4) integrally connected with the end plate body (1). The two ends of the fixed plate II (4) are bent upward at 90° to form a positioning plate (5). The two positioning plates (5) are provided with positioning holes I (6). The middle part of the fixed plate II (4) is provided with several U-shaped grooves I (7) with the opening direction facing outward. The left and right sides of the end plate body (1) are bent inward at 90° to form a protective plate (8).

2. The battery module end plate structure according to claim 1, characterized in that: Each of the fixed plates I (3) is bent upwards at both ends by 90° to form a limiting plate I (9).

3. The battery module end plate structure according to claim 1, characterized in that: The fixing plate I (3) is provided with at least one positioning hole II (10), and the bottom surface of the insulating seat (2) is provided with at least one positioning protrusion, which is matched with the positioning hole II (10).

4. The battery module end plate structure according to claim 1, characterized in that: If the fixing plate II (4) is located above the rectangular through hole (11) formed after cutting a piece of the cuboid II, a reinforcing plate (12) is provided on the upper surface of the fixing plate II (4); if the fixing plate II (4) is located below the rectangular through hole (11), a reinforcing plate (12) is provided on the lower surface of the fixing plate II (4); the reinforcing plate (12) is composed of rib plate I (121) and rib plate II (122) that are perpendicular to each other in an 'L' shape. The rib plate I (121) is welded to the end plate body (1), and the rib plate II (122) is welded to the fixing plate II (4). The rib plate II (122) is provided with a number of U-shaped grooves II corresponding to the U-shaped grooves I (7) opened on the fixing plate II (4).

5. The battery module end plate structure according to claim 1, characterized in that: The upper surface of the outer wall of the insulating base (2) is provided with a limiting plate II (21) that is in the same plane as the outer wall.

6. The battery module end plate structure according to claim 1, characterized in that: The bottom of the left and right sides of the end plate body (1) is cut with chamfers (13).

7. The battery module end plate structure according to claim 1, characterized in that: An extension plate (14) is provided on the top of the end plate body (1). The extension plate (14) is in the same plane as the end plate body (1) and is integrally connected to the end plate body (1).

8. The battery module end plate structure according to claim 1, characterized in that: The end plate body (1) is stamped with at least one groove (15), the groove (15) including one or more combinations of elongated, circular and square shapes.

9. The battery module end plate structure according to claim 1, characterized in that: An insulating film is provided between the end plate body (1) and the internal battery cell (16).

10. A battery module end plate structure according to claim 1, characterized in that: Several U-shaped cuts are cut at the bending line of the end plate body (1) and the guard plate (8). After bending to form the guard plate (8), the guard plate (8) presents a groove structure (17), and the end plate body (1) presents a limiting block (18) corresponding to the groove structure (17).

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