Sheet metal wedge-shaped locking and extruding structure for battery pack and manufacturing and assembling method of sheet metal wedge-shaped locking and extruding structure

Abstract

The invention relates to a metal plate wedge-shaped locking extrusion structure for a battery pack and a manufacturing and assembling method of the metal plate wedge-shaped locking extrusion structure, and belongs to the technical field of battery pack locking. The wedge-shaped locking and extruding structure comprises a wedge-shaped matching sheet metal part, a wedge-shaped locking sheet metal part and a threaded fastener, the wedge-shaped matching sheet metal part comprises a first locking section and a first extruding section, the first extruding section protrudes from front to back to form a wedge-shaped structure, and the wedge-shaped locking sheet metal part comprises a second locking section and a second extruding section. And a lap joint piece corresponding to the wedge-shaped structure is arranged on the extrusion section II. When the battery pack is locked, the threaded fastener penetrates through the first locking section and then is connected with the second locking section, when the first locking section is close to the second locking section through the threaded fastener, the lap joint piece extrudes the wedge-shaped structure, the first extrusion section and the second extrusion section abut against the battery module, and the locking extrusion structure is light in weight, low in cost and convenient to machine; and the adaptability of the structure to the battery pack is improved while firm locking is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery pack locking, and particularly relates to a sheet metal wedge-shaped locking and extrusion structure for a battery pack and its manufacturing and assembly methods. Background Art

[0002] Cooling on the side of the battery cell is an important heat dissipation method for the battery pack. When using side cooling of the battery cell, the side of the battery module of the battery pack is closely pressed and fitted with the liquid cooling plate through a locking structure. As a common mechanical connection method, the wedge-shaped locking structure is widely used in the fields of mechanical manufacturing, fixture design, etc. Its basic principle is to generate lateral tension through the inclined surface of the wedge block to closely fit the connected components, thereby achieving reliable fixation and preventing loosening. However, the traditional wedge-shaped locking structure also has some disadvantages, making it difficult to be applied to the battery pack locking technology.

[0003] On the one hand, the implementation form of the traditional wedge-shaped locking structure is relatively complex. It is necessary to assemble and cooperate the wedge block with the components, or make the wedge block and the components into one body. Usually, the wedge block is made by metal machining, with high costs and heavy weight, which increases the processing difficulty and manufacturing cost. On the other hand, the existing wedge-shaped locking structure has the problem of large size and volume, being unable to adapt to a narrow space environment, and the existing wedge-shaped structure is mainly used for squeezing and locking, unable to achieve the function of vertical and lateral displacement transfer, restricting its application in the design of battery packs in the new energy field. Summary of the Invention

[0004] The purpose of the present invention is to provide a sheet metal wedge-shaped locking and extrusion structure for a battery pack and its manufacturing and assembly methods to solve the above problems.

[0005] The present invention realizes the above purpose through the following technical solutions:

[0006] A sheet metal wedge-shaped locking and extrusion structure for a battery pack, which structure includes a threaded fastener, and a wedge-shaped mating sheet metal part and a wedge-shaped locking sheet metal part arranged in the battery pack. The wedge-shaped mating sheet metal part is connected to the wedge-shaped locking sheet metal part through the threaded fastener;

[0007] The wedge-shaped mating sheet metal part includes a first locking section and a first extrusion section extending downward from the front side of the first locking section. The first extrusion section protrudes from front to back to form a wedge-shaped structure;

[0008] The wedge-shaped locking sheet metal part includes a second locking section and a second extrusion section extending downward from the rear side of the second locking section. A lapping part corresponding to the wedge-shaped structure is arranged on the second extrusion section;

[0009] The battery pack contains multiple battery modules. The threaded fastener penetrates through the first locking section from top to bottom and then is connected to the second locking section. When the threaded fastener presses down the first locking section and makes the first locking section approach the second locking section, the overlapping part squeezes the wedge-shaped structure, causing the first extrusion section and the second extrusion section to move away from each other and press tightly against the battery module.

[0010] As a further optimized solution of the present invention, through holes corresponding to the threaded fasteners one by one are provided on the first locking section, and a threaded fitting is provided on one side of the through hole. A waist-shaped hole corresponding to the threaded fastener one by one is provided on the second locking section.

[0011] As a further optimized solution of the present invention, the overlapping part is divided into two outer plate bodies provided at both ends of the second extrusion section and an inner plate body provided between the two outer plate bodies.

[0012] As a further optimized solution of the present invention, notches are provided at both ends of the first locking section, and the notches correspond to the outer plate bodies one by one.

[0013] As a further optimized solution of the present invention, the upper end of the outer plate body is adjacent to the second locking section.

[0014] As a further optimized solution of the present invention, a plurality of inner plate bodies are provided. The waist-shaped holes at both ends of the second locking section are arranged close to the outer plate bodies, and the remaining waist-shaped holes are respectively arranged directly above each inner plate body.

[0015] As a further optimized solution of the present invention, openings corresponding to the inner plate bodies one by one are provided on the second extrusion section.

[0016] As a further optimized solution of the present invention, the outer plate body includes a first bending plate formed by bending forward from the end of the second extrusion section, and a first outer wedge-shaped plate and a second outer wedge-shaped plate extending forward from the front side of the first bending plate. A first gap is formed between the first outer wedge-shaped plate and the second outer wedge-shaped plate;

[0017] The inner plate body includes a second bending plate formed by bending forward from one side of the opening, and a first inner wedge-shaped plate and a second inner wedge-shaped plate extending forward from the front side of the second bending plate. A second gap is formed between the first inner wedge-shaped plate and the second inner wedge-shaped plate.

[0018] As a further optimized solution of the present invention, the wedge-shaped structure extends from one end to the other end in the length direction of the first extrusion section. At least two wedge-shaped structures are provided. An inclined surface corresponding to the overlapping part is formed on the wedge-shaped structure, and the inclination angle of the inclined surface is between 30° and 60°.

[0019] A manufacturing method for a sheet metal wedge-shaped locking and extrusion structure for a battery pack includes the following steps:

[0020] Prepare two sheet metal blanks and several threaded fasteners. Cut one of the sheet metal blanks along the first outer contour line, and open through holes corresponding to the threaded fasteners one by one at the top of this sheet metal blank to obtain a semi-finished mating sheet metal part. Cut the other sheet metal blank along the second outer contour line and the inner contour line, and open oblong holes corresponding to the threaded fasteners one by one at the top of this sheet metal blank to obtain a semi-finished locking sheet metal part. Wedge-shaped plate-like structures are formed at both ends and inside the semi-finished locking sheet metal part;

[0021] Bend the top and bottom of the semi-finished mating sheet metal part backward along the first horizontal fold line and the second horizontal fold line respectively to form a first locking section, a support section, and a first extrusion section located between the first locking section and the support section. Bend the first extrusion section along several groups of third horizontal fold lines to form several wedge-shaped structures to obtain a wedge-shaped mating sheet metal part. Bend the top of the semi-finished locking sheet metal part forward along the fourth horizontal fold line to form a second locking section and a second extrusion section. Bend the wedge-shaped plate-like structures at both ends and inside the semi-finished locking sheet metal part along the first vertical fold line and the second vertical fold line respectively to form a plurality of overlapping parts.

[0022] An assembly method for a sheet metal wedge-shaped locking and extrusion structure for a battery pack, comprising the following steps:

[0023] Match the wedge-shaped mating sheet metal part with the wedge-shaped locking sheet metal part, and pre-fix the wedge-shaped mating sheet metal part and the wedge-shaped locking sheet metal part through threaded fasteners to form a pre-fixed locking and extrusion structure;

[0024] Place the pre-fixed locking and extrusion structure between two battery modules of the battery pack, apply a tightening torque to the threaded fasteners, the threaded fasteners press down on the first locking section, the first locking section approaches the second locking section, and the overlapping parts extrude the wedge-shaped structures, so that the first extrusion section and the second extrusion section move away from each other and abut against the battery modules to complete the locking of the battery pack.

[0025] The beneficial effects of the present invention are as follows:

[0026] 1) The locking and extrusion structure of the present invention is composed of a wedge-shaped locking sheet metal part and a wedge-shaped mating sheet metal part. The overlapping parts and wedge-shaped structures of the two are both processed by sheet metal processes. Through cutting and bending processing methods, overlapping parts and wedge-shaped structures that can cooperate with each other are formed on the two sheet metal blanks, reducing the weight of the locking and extrusion structure, and reducing the processing difficulty and manufacturing cost;

[0027] 2) A notch for accommodating the lapping piece is provided on the second locking section of the wedge-shaped mating sheet metal part of the present invention, reducing the overall thickness of the wedge-shaped mating sheet metal part and the wedge-shaped locking sheet metal part in the pre-fixed state, facilitating the embedding of the locking and extruding structure between two battery modules of the battery pack. When the lapping pieces on both sides of the wedge-shaped locking sheet metal part are close to the first locking section and abut against the battery module, the tightening torque can be stably transmitted between the inclined surface of the wedge-shaped structure and the wedge-shaped plate of the lapping piece. Moreover, the locking and extruding structure is relatively light in weight, enabling the locking and extruding structure to achieve the function of transmitting vertical and lateral displacements over a relatively long distance, thereby improving the adaptability of the wedge-shaped locking and extruding structure to the battery pack;

[0028] 3) Multiple wedge-shaped plates extend forward on each lapping piece of the present invention, and multiple wedge-shaped structures are correspondingly arranged on the second extrusion section of the wedge-shaped mating sheet metal part, so as to form a force-bearing surface arranged in a rectangular array inside the wedge-shaped locking and extruding structure. In the case of long-distance vertical and lateral displacements between the wedge-shaped locking sheet metal part and the wedge-shaped mating sheet metal part, it is ensured that the wedge-shaped locking and extruding structure can still provide a uniform and stable locking force to the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is the initial state diagram of the sheet metal locking and extruding structure of the present invention;

[0030] Figure 2 is the exploded structure schematic diagram of the sheet metal locking and extruding structure of the present invention;

[0031] Figure 3 is the structure schematic diagram of the wedge-shaped locking sheet metal part of the present invention;

[0032] Figure 4 is the structure schematic diagram of the wedge-shaped mating sheet metal part of the present invention;

[0033] Figure 5 is Figure 1 the enlarged view of part A in

[0034] Figure 6 is Figure 3 the enlarged view of part B in

[0035] Figure 7 is Figure 3 the enlarged view of part C in

[0036] Figure 8 is Figure 4 the enlarged view of part D in

[0037] Figure 9 is the diagram of the state of the sheet metal locking and extruding structure of the present invention after tightening;

[0038] Figure 10 is the schematic diagram of the contour line of the wedge-shaped mating sheet metal part of the present invention;

[0039] Figure 11 It is a schematic diagram of the contour line of the wedge-shaped locking sheet metal part of the present invention;

[0040] Figure 12 It is a schematic diagram of the broken line of the wedge-shaped mating sheet metal part of the present invention;

[0041] Figure 13 It is a schematic diagram of the broken line of the wedge-shaped locking sheet metal part of the present invention;

[0042] Figure 14 It is a schematic diagram of the structure of a battery pack adapted to the present invention;

[0043] Figure 15 It is a schematic diagram of the structure of a traditional wedge-shaped locking structure.

[0044] In the figure: 100, wedge-shaped mating sheet metal part; 200, wedge-shaped locking sheet metal part; 300, threaded fastener; 400, gasket; 110, first locking section; 120, first extrusion section; 130, wedge-shaped structure; 140, threaded mating part; 150, notch; 160, support section; 210, second locking section; 220, second extrusion section; 230, overlapping part; 240, kidney-shaped hole; 250, opening; 231, outer plate body; 231a, first bent plate; 231b, first outer wedge plate; 231c, second outer wedge plate; 231d, first gap; 232, inner plate body; 232a, second bent plate; 232b, first inner wedge plate; 232c, second inner wedge plate; 232d, second gap; L11, first outer contour line; L12, second outer contour line; L13, inner contour line; L21, first horizontal broken line; L22, second horizontal broken line; L23, third horizontal broken line; L24, fourth horizontal broken line; L25, first vertical broken line; L26, second vertical broken line. Specific Embodiment

[0045] The following further describes the present application in detail with reference to the accompanying drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and cannot be understood as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0046] First Embodiment

[0047] As Figure 1-9As shown in the figure, this embodiment relates to a sheet metal wedge locking and extrusion structure for a battery pack. The sheet metal wedge locking and extrusion structure includes a wedge mating sheet metal part 100 and a wedge locking sheet metal part 200 arranged in the battery pack. A threaded fastener 300 is arranged between the wedge mating sheet metal part 100 and the wedge locking sheet metal part 200, and multiple battery modules are arranged in the battery pack. The wedge mating sheet metal part 100 includes a first locking section 110 and a first extrusion section 120 extending downward from the front side of the first locking section 110. The first extrusion section 120 protrudes from front to back to form a wedge structure 130, and the lower end of the first extrusion section 120 extends from front to back to form a support section 160. Both the support section 160 and the first locking section 110 are perpendicular to the first extrusion section 120. The wedge locking sheet metal part 200 includes a second locking section 210 and a second extrusion section 220 extending downward from the rear side of the second locking section 210. A lapping part 230 corresponding to the wedge structure 130 is arranged on the second extrusion section 220. The wedge structure 130 on the first extrusion section 120 is composed of two straight plates. One side of the straight plate at the higher position in the wedge structure 130 forms an inclined surface corresponding to the lapping part 230. The inclination angle of this inclined surface is between 30° and 60°. If it is necessary to convert the vertical displacement into more lateral displacement and increase the extrusion force, a smaller inclination angle can be selected; otherwise, a larger inclination angle can be selected.

[0048] Through holes corresponding to the threaded fastener 300 one by one are arranged on the first locking section 110, and a threaded fitting 140 is arranged on one side of the through hole. The threaded fastener 300 is preferably a locking screw, and the threaded fitting 140 is preferably a nut fixedly arranged at the lower end of the through hole of the first locking section 110. This nut can be a press riveting nut, a spot welding nut, a blind riveting nut, etc. Waist-shaped holes 240 corresponding to the threaded fastener 300 one by one are arranged on the second locking section 210, and an annular gasket 400 is arranged between the waist-shaped holes 240 and the threaded fastener 300. When fixing the wedge mating sheet metal part 100 and the wedge locking sheet metal part 200 to each other, the threaded fastener 300 is sequentially passed through the gasket 400, the waist-shaped holes 240 and the through holes on the first locking section 110, and the lower end of the threaded fastener 300 is screwed into the threaded fitting 140.

[0049] During the process of locking the battery pack, the wedge mating sheet metal part 100 and the wedge locking sheet metal part 200 are pre-fixed first. During pre-fixing, the wedge mating sheet metal part 100 and the wedge locking sheet metal part 200 are first closely attached, and then the threaded fastener 300 penetrates the first locking section 110 from top to bottom, and the lower end of the threaded fastener 300 is connected to the second locking section 210 through the threaded fitting 140. At this time, the assembly thickness of the wedge locking and extrusion structure is in the minimum state. The wedge locking and extrusion structure in this state is as shown in Figure 1 the figure. Then this wedge locking and extrusion structure is placed between two battery modules, and then the formal battery pack locking work is carried out. Please refer to Figure 9, during the formal locking operation of the battery pack, the locking section one 110 is pressed down by the threaded fastener 300, causing the locking section one 110 to approach the locking section two 210. At this time, the overlapping part 230 squeezes the wedge-shaped structure 130, so that the extrusion section one 120 and the extrusion section two 220 move away from each other in the horizontal direction and press against the battery module, making the battery module closely adhere to the liquid cooling plate in the battery pack.

[0050] In addition, please refer to Figure 14 , the wedge-shaped locking and extrusion structure of this embodiment is applicable to Figure 14 the battery pack shown. This battery pack has four battery modules. A liquid cooling plate is provided between the two left battery modules, and a liquid cooling plate is also provided between the two right battery modules. The wedge-shaped locking and extrusion structure is placed in the middle gap of the battery pack, and two battery modules are provided on both sides of the wedge-shaped locking and extrusion structure. During the locking process, the thickness of the wedge-shaped locking and extrusion structure increases, causing the four battery modules to closely adhere to the two liquid cooling plates respectively. In addition, in some other embodiments, the wedge-shaped locking and extrusion structure can also be applicable to battery packs with other numbers of battery modules, and the position of the wedge-shaped locking and extrusion structure can also be adjusted as long as the battery module can be closely adhered to the liquid cooling plate.

[0051] In addition, Figure 15 is a structural schematic diagram of a traditional wedge-shaped locking structure, which is composed of an upper wedge block, a lower wedge block, and several fasteners between the two wedge blocks. Its basic principle is to generate lateral tension through the inclined surface of the wedge block to closely fit the upper and lower wedge blocks with their respective connected components, thereby realizing the locking function. However, this traditional structure not only has the problem of high processing cost, but also has the drawback of being difficult to achieve the function of vertical and lateral displacement transmission. This traditional wedge-shaped locking structure is too rigid, prone to stress concentration at the fasteners, and prone to problems such as loosening and damage of the fasteners after multiple vibrations. In this embodiment, two sheet metal parts, namely the wedge-shaped mating sheet metal part 100 and the wedge-shaped locking sheet metal part 200, are used. The threaded fastener 300 and the locking section one 110 and the locking section two 210 form a connection structure with a certain flexibility, which can improve the seismic performance of the threaded fastener 300, reduce the wear of the threads of the threaded fastener 300, and extend the service life of the wedge-shaped locking and extrusion structure.

[0052] Specifically, the overlapping member 230 is divided into two outer plate bodies 231 provided at both ends of the second extrusion section 220 and a plurality of inner plate bodies 232 provided between the two outer plate bodies 231. Openings 250 corresponding to the inner plate bodies 232 one by one are provided on the second extrusion section 220. Notches 150 are provided at both ends of the first locking section 110, and the notches 150 correspond to the outer plate bodies 231 one by one. The upper end of the outer plate body 231 is adjacent to the second locking section 210. There are a plurality of inner plate bodies 232. The kidney-shaped holes 240 at both ends of the second locking section 210 are arranged close to the outer plate bodies 231, and the remaining kidney-shaped holes 240 are respectively provided directly above each inner plate body 232. In this embodiment, the inner plate body 232 is formed by bending the second extrusion section 220 forward from the opening 250. The outer plate body 231 is formed by bending the second extrusion section 220 forward from both ends in the length direction, saving materials and reducing the processing difficulty of the overlapping member 230. Additionally, in some other embodiments, the overlapping member 230 can also be provided on the second extrusion section 220 by means of welding, screwing, riveting, clamping, bonding, etc.

[0053] Further, as Figure 6 and Figure 7 shown, the outer plate body 231 includes a first bent plate 231a formed by bending forward from the end of the second extrusion section 220, and a first outer wedge plate 231b and a second outer wedge plate 231c extending forward from the front side of the first bent plate 231a. A gap one 231d is formed between the first outer wedge plate 231b and the second outer wedge plate 231c. The inner plate body 232 includes a second bent plate 232a formed by bending forward from one side of the opening 250, and a first inner wedge plate 232b and a second inner wedge plate 232c extending forward from the front side of the second bent plate 232a. A gap two 232d is formed between the first inner wedge plate 232b and the second inner wedge plate 232c. Figure 6 The dotted line in Figure 7 is the demarcation line between the first bent plate 231a and the first outer wedge plate 231b and the second outer wedge plate 231c, and the dotted line in

[0054] Specifically, the first outer wedge plate 231b and the second outer wedge plate 231c respectively cooperate with the inclined surfaces on the two wedge structures 130. Similarly, the first inner wedge plate 232b and the second inner wedge plate 232c respectively cooperate with the inclined surfaces on the two wedge structures 130. The settings of the first gap 231d and the second gap 232d leave a receiving space for the straight plates at the lower positions on the wedge structures 130, and can ensure that the distances between the first outer wedge plate 231b and the second outer wedge plate 231c and between the first inner wedge plate 232b and the second inner wedge plate 232c are far enough apart, so that during the vertical displacement conversion, the force application points are dispersed up and down, improving the smoothness when assembling this wedge locking and extrusion structure. In addition, in some other embodiments, the number of the wedge structures 130 can be adjusted according to actual needs, and the outer wedge plates and inner wedge plates can be added to the outer plate body 231 and the inner plate body 232 accordingly.

[0055] Second Embodiment

[0056] As Figure 10-13 shown, this embodiment relates to a manufacturing method applicable to the sheet metal wedge locking and extrusion structure in the first embodiment. This method includes the following steps:

[0057] Step 1: Prepare two sheet metal blanks and a number of threaded fasteners 300. Cut one of the sheet metal blanks along the first outer contour line L11, and open through holes corresponding to the threaded fasteners 300 one by one at the top of this sheet metal blank to obtain a semi-finished mating sheet metal part. Cut the other sheet metal blank along the second outer contour line L12 and the inner contour line L13, and open waist-shaped holes 240 corresponding to the threaded fasteners 300 one by one at the top of this sheet metal blank to obtain a semi-finished locking sheet metal part. Both the second outer contour line L12 and the inner contour line L13 have wedge-shaped curves, so that after the semi-finished locking sheet metal part is cut, wedge-shaped plate structures are formed at both ends and inside thereof.

[0058] Step 2: Bend the top and bottom of the semi-finished mating sheet metal part backward along the first horizontal fold line L21 and the second horizontal fold line L22 respectively to form a first locking section 110, a support section 160, and an extrusion section 120 located between the first locking section 110 and the support section 160. Bend the extrusion section 120 along several groups of third horizontal fold lines L23 to form several wedge structures 130 to obtain a wedge mating sheet metal part 100. Bend the top of the semi-finished locking sheet metal part forward along the fourth horizontal fold line L24 to form a second locking section 210 and an extrusion section 220. Bend the wedge-shaped plate structures at both ends and inside of the semi-finished locking sheet metal part along the first vertical fold line L25 and the second vertical fold line L26 respectively to form a plurality of overlapping parts 230.

[0059] Third Embodiment

[0060] As Figure 1 、 9, as shown in Fig. 14, this embodiment relates to an assembly method for the sheet metal wedge locking and extrusion structure in the first embodiment. The method includes the following steps:

[0061] Step 3: Mate the wedge-shaped mating sheet metal part 100 with the wedge-shaped locking sheet metal part 200, and pre-fix the wedge-shaped mating sheet metal part 100 and the wedge-shaped locking sheet metal part 200 through the threaded fastener 300 to form a pre-fixed locking and extrusion structure. At this time, for the state of this pre-fixed locking and extrusion structure, please refer to Figure 1 , the front ends of the first outer wedge plate 231b, the second outer wedge plate 231c, the first inner wedge plate 232b, and the second inner wedge plate 232c are all in contact with the rear side wall of the first extrusion section 120.

[0062] Step 4: Place the pre-fixed locking and extrusion structure between two battery modules of the battery pack. Then, perform the formal battery pack locking operation. Apply a tightening torque to the threaded fastener 300. The threaded fastener 300 presses down the first locking section 110. The first locking section 110 approaches the second locking section 210, and the overlapping part 230 squeezes the wedge structure 130, so that the first extrusion section 120 and the second extrusion section 220 move away from each other in the horizontal direction and press against the battery module to complete the locking of the battery pack. Figure 9 It is a diagram of the tightened state of the sheet metal locking and extrusion structure.

[0063] In Step 4, during the formal battery pack locking operation, the tightening torque can be applied to each threaded fastener 300 in sequence. For example, first apply the tightening torque to the middle threaded fastener 300, and then gradually apply the tightening torque to the threaded fasteners 300 on both sides. After all the threaded fasteners 300 are applied with the tightening torque once, repeat the above process to apply the tightening torque to all the threaded fasteners 300 multiple times until the first extrusion section 120 and the second extrusion section 220 are in close contact with the battery module. In addition, during the formal battery pack locking operation, some of the threaded fasteners 300 can also be unscrewed from the threaded fitting 140, only one or two threaded fasteners 300 are left screwed to the threaded fitting 140, and a continuous tightening torque is applied to the threaded fasteners 300 screwed to the threaded fitting 140 until the first extrusion section 120 and the second extrusion section 220 are in close contact with the battery module, and then the remaining threaded fasteners 300 are screwed into the corresponding threaded fittings 140.

[0064] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A sheet metal wedge locking and extrusion structure for a battery pack, including a threaded fastener (300), characterized in that: It further includes a wedge - fitting sheet metal part (100) and a wedge - locking sheet metal part (200) disposed in the battery pack. The wedge - fitting sheet metal part (100) is connected to the wedge - locking sheet metal part (200) by a threaded fastener (300). The wedge - fitting sheet metal part (100) includes a first locking section (110) and a first extrusion section (120) formed by extending downward from the front side of the first locking section (110). The first extrusion section (120) protrudes from front to back to form a wedge structure (130). The wedge - locking sheet metal part (200) includes a second locking section (210) and a second extrusion section (220) formed by extending downward from the rear side of the second locking section (210). A lapping part (230) corresponding to the wedge structure (130) is provided on the second extrusion section (220). A plurality of battery modules are disposed in the battery pack. The threaded fastener (300) penetrates the first locking section (110) from top to bottom and is connected to the second locking section (210). When the threaded fastener (300) presses down the first locking section (110) to make the first locking section (110) approach the second locking section (210), the lapping part (230) extrudes the wedge structure (130), so that the first extrusion section (120) and the second extrusion section (220) move away from each other and tightly press against the battery modules.

2. The sheet metal wedge-shaped locking extrusion structure according to claim 1, characterized in that: Through - holes corresponding one - to - one to the threaded fasteners (300) are provided on the first locking section (110), and a threaded fitting (140) is provided on one side of the through - holes. Slots (240) corresponding one - to - one to the threaded fasteners (300) are provided on the second locking section (210).

3. The sheet metal wedge-shaped locking extrusion structure according to claim 1, characterized in that: The lapping part (230) is divided into two outer plate bodies (231) disposed at both ends of the second extrusion section (220) and an inner plate body (232) disposed between the two outer plate bodies (231).

4. The sheet metal wedge-shaped locking extrusion structure according to claim 3, wherein: Notches (150) are provided at both ends of the first locking section (110), and the notches (150) correspond one - to - one to the outer plate bodies (231).

5. The sheet metal wedge-shaped locking extrusion structure according to claim 3, wherein: The upper ends of the outer plate bodies (231) are adjacent to the second locking section (210).

6. The sheet metal wedge-shaped locking extrusion structure according to claim 3, characterized in that: A plurality of inner plate bodies (232) are provided. The slots (240) at both ends of the second locking section (210) are disposed close to the outer plate bodies (231), and the remaining slots (240) are respectively disposed directly above the respective inner plate bodies (232).

7. The sheet metal wedge-shaped locking extrusion structure according to claim 3, wherein: Openings (250) corresponding one - to - one to the inner plate bodies (232) are provided on the second extrusion section (220).

8. The sheet metal wedge-shaped locking extrusion structure according to claim 7, characterized in that: The outer plate body (231) includes a first bending plate (231a) formed by bending forward from the end of the second extrusion section (220), and a first outer wedge plate (231b) and a second outer wedge plate (231c) extending forward from the front side of the first bending plate (231a). A first gap (231d) is formed between the first outer wedge plate (231b) and the second outer wedge plate (231c). The inner plate body (232) includes a second bent plate (232a) formed by bending forward from one side of the opening (250), and a first inner wedge plate (232b) and a second inner wedge plate (232c) extending forward from the front side of the second bent plate (232a). A second gap (232d) is formed between the first inner wedge plate (232b) and the second inner wedge plate (232c).

9. The sheet metal wedge-shaped locking extrusion structure according to claim 1, wherein: The wedge-shaped structure (130) extends from one end to the other end in the length direction of the first extrusion section (120). At least two wedge-shaped structures (130) are provided. An inclined surface corresponding to the overlapping member (230) is formed on the wedge-shaped structure (130), and the inclination angle of the inclined surface is between 30° and 60°.

10. A manufacturing method applicable to the sheet metal wedge-shaped locking extrusion structure described in any one of claims 1-9, characterized in that, Including the following steps: Prepare two sheet metal blanks and a number of threaded fasteners (300). Cut one of the sheet metal blanks along the first outer contour line (L11), and open through holes corresponding to the threaded fasteners (300) one by one at the top of the sheet metal blank to obtain a semi-finished mating sheet metal part. Cut the other sheet metal blank along the second outer contour line (L12) and the inner contour line (L13), and open waist-shaped holes (240) corresponding to the threaded fasteners (300) one by one at the top of the sheet metal blank to obtain a semi-finished locking sheet metal part. Wedge-shaped plate-like structures are formed at both ends and inside the semi-finished locking sheet metal part; Bend the top and bottom of the semi-finished mating sheet metal part backward along the first horizontal fold line (L21) and the second horizontal fold line (L22) respectively to form a first locking section (110), a support section (160), and a first extrusion section (120) located between the first locking section (110) and the support section (160). Bend the first extrusion section (120) along a number of groups of third horizontal fold lines (L23) to form a number of wedge-shaped structures (130) to obtain a wedge-shaped mating sheet metal part (100). Bend the top of the semi-finished locking sheet metal part forward along the fourth horizontal fold line (L24) to form a second locking section (210) and a second extrusion section (220). Bend the wedge-shaped plate-like structures at both ends and inside the semi-finished locking sheet metal part along the first vertical fold line (L25) and the second vertical fold line (L26) respectively to form a plurality of overlapping members (230).

11. An assembly method applicable to the sheet metal wedge-shaped locking and extrusion structure according to any one of claims 1-9, characterized in that, Including the following steps: Match the wedge-shaped mating sheet metal part (100) with the wedge-shaped locking sheet metal part (200), and pre-fix the wedge-shaped mating sheet metal part (100) and the wedge-shaped locking sheet metal part (200) through the threaded fasteners (300) to form a pre-fixed locking and extrusion structure; Place the pre-fixed locking and extrusion structure between two battery modules of the battery pack, apply a tightening torque to the threaded fasteners (300). The threaded fasteners (300) press down the first locking section (110), the first locking section (110) approaches the second locking section (210), and the overlapping member (230) presses the wedge-shaped structure (130), so that the first extrusion section (120) and the second extrusion section (220) move away from each other and press against the battery module to complete the locking of the battery pack.

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