Edge beam structure and CTP energy storage subrack with same

Abstract

The utility model relates to the technical field of energy storage subracks, in particular to a boundary beam structure which comprises a back plate, side plates and reinforcing plates, the lower end of the back plate is bent forwards by 90 degrees to form a bottom plate, the upper end of the back plate is bent forwards by 90 degrees to form a top plate, and the front end of the top plate is bent downwards by 90 degrees to form a blocking edge; the side plates are arranged on the left side and the right side of the back plate respectively, the upper ends of the side plates are embedded into gaps formed by the blocking edges, the top plate and the back plate, and the top faces of the side plates and the bottom face of the top plate are welded and fixed. Through a gridding welding structure of the side plates and the reinforcing plates and a continuous structure (bottom plate-back plate-top plate-blocking edge) formed by bending, the overall flexural rigidity of the boundary beam structure is improved, a battery cell can be prevented from being excessively expanded in an EOL stage, potential safety hazards caused by too large expansion force are effectively eliminated, and the service life of the battery cell is prolonged. The problem that potential safety hazards are caused by the fact that an existing subrack boundary beam structure is prone to causing excessive expansion of a battery cell in the EOL stage is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of energy storage plug -in box, especially to a kind of edge beam structure and the CTP energy storage plug -in box with the structure. BACKGROUND

[0002] As the core structure of battery module integration packaging, energy storage plug-in box bears key functions such as mechanical fixation of battery cell, heat management conduction and system protection.For example, the invention application with publication (announcement) No.CN115172969A discloses a kind of liquid-cooled battery energy storage plug-in box structure.

[0003] Under the technical architecture of CTP, plug-in box edge beam needs to directly bear the expansion force in all directions generated by battery cell charging and discharging cycle, and the structural reliability directly affects the safety of the whole life cycle of energy storage system.The current mainstream energy storage plug-in box edge beam structure is as shown in Figure 1 It is formed by welding HC340_DP590 dual-phase steel, the thickness of both side plates is 2mm, and the thickness of back plate and reinforcing rib is 1.5mm.

[0004] The overall strength of the above-mentioned plug-in box edge beam structure is poor, and when bearing the expansion force at EOL stage of battery cell, it often causes excessive expansion of battery cell due to insufficient strength, which further leads to the risk of battery cell leakage, diving and battery pack structure failure.Therefore, it is necessary to provide an edge beam structure and a CTP energy storage plug-in box with the structure, which can better bear and absorb the expansion force of battery cell at EOL stage of battery pack and eliminate safety hazards. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides an edge beam structure and a CTP energy storage plug-in box with the structure, which improves the overall bending stiffness of edge beam structure through the grid welding structure of side plate and reinforcing plate and the continuous structure (bottom plate-back plate-top plate-stop edge) formed by bending, can prevent excessive expansion of battery cell at EOL stage, effectively eliminate safety hazards caused by excessive expansion force, and solve the problem that the existing plug-in box edge beam structure easily leads to excessive expansion of battery cell at EOL stage and causes safety hazards.

[0006] The technical scheme of the utility model is as follows:

[0007] The utility model provides an edge beam structure, which comprises a back plate, a side plate and a reinforcing plate, wherein,

[0008] The lower end of the back plate is bent forward by 90 degrees to form a bottom plate, and the upper end is bent forward by 90 degrees to form a top plate, and the front end of the top plate is bent downward by 90 degrees to form a stop edge.

[0009] The side plates are arranged on the left and right sides of the back plate, the upper end of the side plate is embedded in the gap formed by the top plate, the back plate and the baffle, the top surface of the side plate is welded and fixed with the bottom surface of the top plate, the rear end is welded and fixed with the front end surface of the back plate, and the lower end is welded and fixed with the top surface of the bottom plate.

[0010] The reinforcing plates are arranged between the two side plates and spaced apart in the left-right direction, the rear end of the reinforcing plate is welded and fixed with the front end surface of the back plate, the lower end is welded and fixed with the top surface of the bottom plate, and the top end is welded and fixed with the bottom surface of the top plate.

[0011] On the basis of the above technical scheme, preferably, the width of the top plate in the front-rear direction is less than the width of the bottom plate in the front-rear direction.

[0012] On the basis of the above technical scheme, preferably, the upper end of the side plate and the reinforcing plate are both in the shape of a right-angled trapezoid, and the vertical side of the right-angled trapezoid abuts against the front end surface of the back plate.

[0013] On the basis of the above technical scheme, preferably, the lower end of the baffle abuts against the inclined side of the right-angled trapezoid.

[0014] On the basis of the above technical scheme, preferably, the side plate is provided with a first chamfer at the corner near the bending part of the back plate, and the reinforcing plate is provided with a second chamfer at the corner near the bending part of the back plate.

[0015] On the basis of the above technical scheme, preferably, a plurality of output stage base mounting holes are arranged on the top plate in the vertical direction.

[0016] On the basis of the above technical scheme, preferably, a plurality of cold plate mounting holes are arranged on the bottom plate in the vertical direction.

[0017] On the basis of the above technical scheme, preferably, the bottom edge of the left and right sides of the back plate extends outward horizontally to form a plate-shaped protruding part, wherein,

[0018] The top part of the protruding part is connected to the side part of the back plate through an inclined surface;

[0019] The side end of the bottom plate extends outward horizontally and is aligned with the side end of the protruding part.

[0020] On the basis of the above technical scheme, preferably, the lower end of the side plate is bent outward to form a bending part, and the lower end of the bending part is bent downward by 90 degrees to form a supporting part, wherein,

[0021] The top surface of the bending part is aligned with the top surface of the inclined surface;

[0022] The side end of the support part is aligned with the side end of the protruding part, and the support part and the protruding part are welded and fixed;

[0023] The lower end of the support part is welded and fixed with the top surface of the bottom plate.

[0024] The utility model also provides a CTP energy storage plug -in box which comprises the above -mentioned edge beam structure and also comprises a box frame and a battery cell tray,

[0025] The box frame is welded on the top of the battery cell tray;

[0026] The bottom plate is arranged on the inner side of the box frame and is welded and fixed on the top of the battery cell tray;

[0027] The front end of the bottom plate abuts against the inner side end of the box frame and is welded and fixed, and the rear end is used for fixing a battery cell;

[0028] The side end of the protruding part abuts against the inner side end of the box frame and is welded and fixed;

[0029] The side end of the support part abuts against the inner side end of the box frame and is welded and fixed;

[0030] A bolt mounting hole is vertically and throughly arranged on the battery cell tray and corresponds to the position of the cold plate mounting hole.

[0031] The utility model relates to a kind of edge beam structure and the CTP energy storage plug -in box with the structure of the prior art have the following beneficial effects relative to:

[0032] (1) by the continuous bending structure of bottom plate-back plate-top plate-stop along, form integral type bending frame, significantly improve the torsional stiffness of edge beam structure.Simultaneously, several reinforcing plates are arranged between the two side plates, and form multistage grid support system with side plate, can evenly disperse battery cell expansion force, avoid the plastic deformation caused by local stress concentration, to effectively inhibit the excessive expansion of battery cell in EOL stage, eliminate the risk of liquid leakage and structural failure.

[0033] (2) by embedding the upper end of side plate into the gap formed by top plate and back plate, and using three-way welding fixation of top surface, rear end and bottom surface, form high-strength grid node, greatly improve the shear deformation resistance of edge beam structure, ensure that side plate is not displaced under the action of battery cell expansion force, so that the resistance of edge beam structure to battery cell expansion force is better.

[0034] (3) By setting the top plate front and rear width is less than the bottom plate front and rear width, the narrow design of the top plate is realized, the weight of the top of the side beam is reduced, and the bottom bearing area is increased by the widening of the bottom plate, realizing the collaborative optimization of lightweight and high bearing. At the same time, after the narrowing of the top plate, the wrapping range of the side plate upper end by the blocking edge is more concentrated, and the right angle trapezoidal structure design is combined to further improve the torsional rigidity of the side beam structure.

[0035] (4) By setting the straight trapezoidal inclined edge of the blocking edge lower end and the side plate and the reinforcing plate, a mechanical limiting structure is formed, which prevents the upward displacement of the side plate and the reinforcing plate under the expansion force of the battery cell, thereby avoiding the fatigue cracking of the welding point and prolonging the service life of the side beam structure.

[0036] (5) By setting the side end of the protruding part abutting and welding with the inner side end of the box frame, and the side end of the supporting part abutting and welding with the inner side end of the box frame, the side beam structure, the box frame and the battery cell tray form a closed bearing frame, and the overall bending strength is improved. At the same time, the welding of the supporting part and the bottom plate forms multidirectional constraint, which significantly improves the anti-expansion performance of the side beam. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creating any creative labor.

[0038] Figure 1 It is a perspective view of the prior art side beam structure;

[0039] Figure 2 It is a perspective view of a side beam structure and a three-dimensional view of the structure of the present application;

[0040] Figure 3 It is a perspective view of Figure 2 from another angle;

[0041] Figure 4 It is a side view of Figure 2 ;

[0042] Figure 5 It is a perspective view of a CTP energy storage plug-in box of the present application;

[0043] Figure 6 It is a perspective view of Figure 5 from another angle;

[0044] Figure 7 It is a side view of Figure 5 ;

[0045] In the diagram: 1. Back plate; 2. Side plate; 3. Reinforcing plate; 4. Cabinet frame; 5. Cell tray; 11. Bottom plate; 12. Top plate; 13. Protrusion; 21. Bending part; 22. Support part; 121. Edge; 131. Bevel; 201. First chamfer; 301. Second chamfer; 501. Bolt mounting hole; 1101. Cold plate mounting hole; 1201. Output stage base mounting hole. Detailed Implementation

[0046] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and 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 scope of protection of this utility model.

[0047] like Figures 2-7 As shown, a side beam structure of this utility model includes a back plate 1, a side plate 2, and a reinforcing plate 3.

[0048] The back plate 1 has its lower end bent forward at a 90-degree angle to form a bottom plate 11, and its upper end bent forward at a 90-degree angle to form a top plate 12. The front end of the top plate 12 is bent downward at a 90-degree angle to form a retaining edge 121. There is one side plate 2 on each of the left and right sides of the back plate 1. The upper end of the side plate 2 is embedded in the gap formed by the retaining edge 121, the top plate 12 and the back plate 1. The top surface of the side plate 2 is welded to the bottom surface of the top plate 12, the rear end is welded to the front surface of the back plate 1, and the lower end is welded to the top surface of the bottom plate 11. There are several reinforcing plates 3 spaced apart in the left and right direction between the two side plates 2. The rear end of the reinforcing plate 3 is welded to the front surface of the back plate 1, the lower end is welded to the top surface of the bottom plate 11, and the top end is welded to the bottom surface of the top plate 12.

[0049] The continuous bending structure of the base plate 11, back plate 1, top plate 12, and flange 121 forms an integral bending-resistant frame, significantly improving the torsional stiffness of the side beam structure. Simultaneously, several reinforcing plates 3 are spaced between the two side plates 2, forming a multi-level gridded support system together with the side plates 2. This system evenly distributes the cell expansion force, avoiding plastic deformation caused by localized stress concentration, thereby effectively suppressing excessive cell expansion during the EOL stage and eliminating the risk of leakage and structural failure. Furthermore, the upper end of the side plate 2 is embedded in the gap formed by the flange 121, top plate 12, and back plate 1, and is fixed by three-way welding on the top, rear, and bottom surfaces, forming a high-strength grid node. This significantly improves the shear deformation resistance of the side beam structure, ensuring that the side plate 2 will not shift under the cell expansion force, thus enhancing the side beam structure's resistance to cell expansion.

[0050] In addition, in the structure, the thickness of the back plate 1 is 2 mm, and the thickness of the reinforcing plate 3 is 3 mm, and the materials of the two are HC340_DP590. In this way, the side beam structure has high strength and good formability, and the strain hardening characteristics can effectively cope with the gradual process of the cell expansion.

[0051] As shown in Figure 2 , the width of the top plate 12 in the front-rear direction is smaller than the width of the bottom plate 11 in the front-rear direction. In this way, the narrow design of the top plate 12 is realized, the weight of the top of the side beam is reduced, and the bottom load area is increased by the widening of the bottom plate 11, realizing the synergistic optimization of lightweight and high load. At the same time, after the narrowing of the top plate 12, the wrapping range of the side plate 2 upper end by the stop edge 121 is more concentrated, further improving the torsional stiffness of the side beam structure.

[0052] As shown in Figure 2 , the upper end of the side plate 2 and the reinforcing plate 3 are both in a right-angled trapezoidal shape, and the vertical side of the right-angled trapezoidal shape abuts against the front end face of the back plate 1, and the lower end of the stop edge 121 abuts against the oblique side of the right-angled trapezoidal shape. In this way, a mechanical limiting structure is formed to prevent the side plate 2 and the reinforcing plate 3 from being displaced upward under the cell expansion force, thereby avoiding weld fatigue cracking and prolonging the service life of the side beam structure.

[0053] In addition, through the right-angled trapezoidal structure design combined with the above-mentioned narrowing design, the torsional stiffness of the side beam structure is higher.

[0054] As shown in Figure 4 , the corner of the side plate 2 near the bending position of the back plate 1 is provided with a first chamfer 201, and the corner of the reinforcing plate 3 near the bending position of the back plate 1 is provided with a second chamfer 301. Among them, the two chamfers are C corners, which are used to avoid the bending position of the back plate 1, prevent the corner position of the side plate 2 and the reinforcing plate 3 from interfering with the back plate 1, and facilitate the installation of the side plate 2 and the reinforcing plate 3.

[0055] As shown in Figure 2 , a plurality of output stage base mounting holes 1201 are provided on the top plate 12 along the vertical direction. In combination with Figure 5 , the output stage base mounting hole 1201 is used to install the output stage base. Since the output stage base mounting hole 1201 is directly integrated on the top plate 12, the high stiffness characteristics of the top plate 12 can be utilized to ensure the stability of the output stage electrical connection mounting plane.

[0056] As shown in Figure 2 , a plurality of cold plate mounting holes 1101 are provided on the bottom plate 11 along the vertical direction. The holes are used for bolt mounting of the cold plate, and through the structure, the side beam structure can be cooled by the cold plate to accelerate the heat dissipation of the side of the cell.

[0057] As shown in Figure 3As shown, the bottom edges of the left and right sides of the back plate 1 extend horizontally outward to form plate-shaped protrusions 13, wherein the top of the protrusion 13 is connected and transitions to the side of the back plate 1 through a slope 131; the side end of the bottom plate 11 extends horizontally outward and aligns with the side end of the protrusion 13. In this structure, the top of the protrusion 13 is wedge-shaped to form the slope 131. In this structure, the protrusion 13 expands the welding contact area between the back plate 1 and the box frame 4, improving the overall connection strength of the edge beam and the plug-in box; the slope 131 optimizes the load transfer path of the back plate 1 and the protrusion 13, reducing stress concentration at the connection; the side end of the bottom plate 11 aligns with the protrusion 13, ensuring the assembly precision and load symmetry of the edge beam and the plug-in box.

[0058] As shown in the drawings, Figure 3 the lower end of the side plate 2 is bent outward to form a bent portion 21, and the lower end of the bent portion 21 is bent downward by 90 degrees to form a support portion 22, wherein the top surface of the bent portion 21 aligns with the top surface of the slope 131; the side end of the support portion 22 aligns with the side end of the protrusion 13, and the support portion 22 is welded and fixed with the protrusion 13; the lower end of the support portion 22 is welded and fixed with the top surface of the bottom plate 11. Through this structure, the welding and fixing of the support portion 22 and the bottom plate 11 form multidirectional constraint, significantly improving the anti-expansion performance of the edge beam.

[0059] The above protruding structure is used to adapt to the internal space of the CTP energy storage plug-in box. Specifically, as shown in the drawings, Figures 5-7 the CTP energy storage plug-in box includes a box frame 4 and a cell tray 5, wherein the box frame 4 is welded on the top of the cell tray 5; the bottom plate 11 is arranged on the inner side of the box frame 4 and is welded and fixed on the top of the cell tray 5; the front end of the bottom plate 11 abuts against the inner side end of the box frame 4 and is welded and fixed, and the rear end is used for fixing the cell; the side end of the protrusion 13 abuts against the inner side end of the box frame 4 and is welded and fixed; the side end of the support portion 22 abuts against the inner side end of the box frame 4 and is welded and fixed; the cell tray 5 is provided with a bolt mounting hole 501 vertically through the position corresponding to the cold plate mounting hole 1101.

[0060] In the above structure, the cell is fixed on the cell tray 5, and the side thereof abuts against the rear end of the back plate 1 to form a relatively fixed positional relationship. In addition, the welding integration design of the edge beam structure and the box frame 4 and the cell tray 5 makes the plug-in box form a self-supporting rigid frame, which can withstand the cell full-life cycle expansion force. The cold plate mounting hole 1101 and the bolt mounting hole 501 are accurately aligned to ensure the cold plate mounting precision. The rear end of the edge beam abuts against the side end of the cell to limit the expansion direction of the cell, avoiding liquid leakage and structural failure caused by disordered expansion of the cell.

[0061] The manufacturing and installation method of the edge beam structure of the utility model is as follows:

[0062] First, the back plate 1 is bent to form Figure 2The structure state is shown, then the side plate 2 is placed on both sides of the back plate 1 and welded and fixed, then the reinforcing plate 3 is placed on the front side of the back plate 1 and welded and fixed, and the side beam structure is formed.

[0063] When the side beam structure is installed, the side beam structure is placed on the battery cell tray 5, the bottom plate 11 front end is abutted against the inner side end of the box frame 4, then the edge of the bottom plate 11 is welded and fixed with the battery cell tray 5, the edge of the protruding part 13 is welded and fixed with the box frame 4, and the edge of the supporting part 22 is welded and fixed with the box frame 4, and the installation of the side beam structure is completed.

[0064] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A stringer structure comprising a back plate (1), characterized in that: Further comprising a side plate (2) and a reinforcing plate (3), wherein, the lower end of the back plate (1) is bent 90 degrees forward to form a bottom plate (11), and the upper end is bent 90 degrees forward to form a top plate (12), and the front end of the top plate (12) is bent 90 degrees downward to form a stop edge (121); the side plate (2) is arranged on the left and right sides of the back plate (1), the upper end of the side plate (2) is embedded in the gap formed by the stop edge (121), the top plate (12) and the back plate (1), the top surface of the side plate (2) is welded and fixed with the bottom surface of the top plate (12), the rear end is welded and fixed with the front end surface of the back plate (1), and the lower end is welded and fixed with the top surface of the bottom plate (11); the reinforcing plate (3) is arranged between the two side plates (2) in the left and right directions, the rear end of the reinforcing plate (3) is welded and fixed with the front end surface of the back plate (1), the lower end is welded and fixed with the top surface of the bottom plate (11), and the top end is welded and fixed with the bottom surface of the top plate (12).

2. A stringer structure as claimed in claim 1, characterized in that: The width of the top plate (12) in the front and rear direction is less than the width of the bottom plate (11) in the front and rear direction.

3. A stringer structure as defined in claim 1, wherein: The upper end of the side plate (2) and the reinforcing plate (3) is in the shape of a right-angled trapezoid, and the vertical side of the right-angled trapezoid abuts the front end surface of the back plate (1).

4. A stringer structure as claimed in claim 3, characterized in that: The lower end of the stop edge (121) abuts the inclined side of the right-angled trapezoid.

5. A stringer structure as defined in claim 1, wherein: The side plate (2) is provided with a first chamfer (201) at the corner near the bending part of the back plate (1), and the reinforcing plate (3) is provided with a second chamfer (301) at the corner near the bending part of the back plate (1).

6. A stringer structure as defined in claim 1, wherein: A plurality of output stage base mounting holes (1201) are vertically arranged on the top plate (12).

7. A stringer structure as defined in claim 1, wherein: A plurality of cold plate mounting holes (1101) are vertically arranged on the bottom plate (11).

8. A stringer structure as claimed in claim 7, characterized in that: The bottom edges of the left and right sides of the back plate (1) extend outward horizontally to form plate-shaped protrusions (13), wherein, The top of the protrusion (13) is connected and transitioned with the side of the back plate (1) through a slope (131); The side end of the bottom plate (11) extends outward horizontally and aligns with the side end of the protrusion (13).

9. A stringer structure as claimed in claim 8, characterized in that: The lower end of the side plate (2) is bent outward to form a bending part (21), and the lower end of the bending part (21) is bent 90 degrees downward to form a support part (22), wherein, The top surface of the bending part (21) aligns with the top surface of the slope (131); The side end of the support part (22) aligns with the side end of the protrusion (13), and the support part (22) is welded and fixed with the protrusion (13); The lower end of the support part (22) is welded and fixed with the top surface of the bottom plate (11).

10. A CTP energy storage cabinet, characterized in that: The side beam structure as claimed in claim 9 further comprises a box frame (4) and a battery cell tray (5), wherein, The box frame (4) is welded on the top of the battery cell tray (5); The bottom plate (11) is arranged on the inner side of the box frame (4) and is welded and fixed on the top of the battery cell tray (5); The front end of the bottom plate (11) is abutted with and welded to the inner side end of the box frame (4), and the rear end is used for fixing the battery cell; The side end of the protruding part (13) is abutted with and welded to the inner side end of the box frame (4); The side end of the supporting part (22) is abutted with and welded to the inner side end of the box frame (4); The bolt mounting hole (501) is vertically and throughly arranged on the position of the battery cell tray (5) corresponding to the cold plate mounting hole (1101).

Images