Auxiliary tooling, high-voltage component and assembly method

Abstract

The present invention discloses an auxiliary tooling, a high-voltage assembly and an assembly method, which ensure the positioning between the high-voltage copper busbar and the high-voltage output component, and solve the technical problem that the high-voltage copper busbar and the high-voltage output component are difficult to assemble. The auxiliary tooling includes a main body, a first connecting part and a second connecting part. The main body is provided with a limiting boss adapted to the mounting hole of the positive output copper busbar and the mounting hole of the negative output copper busbar respectively; the first connecting part is connected to the first end of the main body, and is used for detachable connection with the intake end plate; the second connecting part is connected to the second end of the main body, and is used for detachable connection with the blind end plate assembly. By using a fixed-size auxiliary tooling as a reference, the position of the mounting hole of the output part is always determined by the limiting structure during the installation of the copper busbar to the battery stack. By first positioning the mounting hole and then connecting the output copper busbar and the collector plate, the auxiliary positioning function during the installation of the high-voltage copper busbar assembly is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to an auxiliary tooling, a high-voltage component and an assembly method. Background Art

[0002] Fuel cell stacks are usually composed of multiple single cells connected in series, with high output voltage and high electrical safety requirements. The power output requirements of fuel cells are gradually increasing, and the number of single cells is also gradually increasing. Fuel cell stacks with more than 500 cells have appeared on the market, and the spacing between single cells is usually between 1mm-1.5mm. Therefore, the spacing between the intake collector plate and the blind collector plate, which are connected to the first and last two cells and are responsible for outputting electrical energy to the outside, is gradually increasing. The spacing between the positive output end and the negative output end of the high-voltage copper busbar of the stack connected to the collector plate is also gradually increasing.

[0003] Due to the limited internal space of the fuel cell stack, the high-voltage copper busbar of the fuel cell stack usually needs to be structurally avoided and surface insulated according to the requirements of electrical clearance and creepage distance, which makes the copper busbar structure complicated. Due to the large length and complex structure of the high-voltage copper busbar and the processing errors during the manufacturing process, there is a certain deviation between the actual copper busbar structure and the theoretical state, which leads to the technical problem of difficulty in assembling the copper busbar of the high-voltage component and the high-voltage output component, namely the high-voltage through-terminal. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an auxiliary tooling, a high-voltage component and an assembly method to ensure the positioning between the high-voltage copper busbar and the high-voltage output component, and solve the technical problem of the difficulty in assembling the high-voltage copper busbar and the high-voltage output component.

[0005] The solution to achieve the technical purpose of the present invention is to provide an auxiliary tool for installing a high-voltage component of a fuel cell, the auxiliary tool comprising:

[0006] The main body is provided with a limiting boss adapted to the mounting hole of the positive output copper bar and the mounting hole of the negative output copper bar respectively;

[0007] A first connecting portion, connected to the first end of the body, and used for detachably connecting to the air intake end plate;

[0008] The second connecting portion is connected to the second end of the body and is used for detachable connection with the blind end plate assembly.

[0009] Furthermore, the limiting boss is a stepped shaft, the small shaft section of the stepped shaft is used to pass through the mounting hole, and the step surface of the stepped shaft is used to limit the positive output copper bar / the negative output copper bar.

[0010] Furthermore, the main body, the first connecting portion and the second connecting portion are an integrated structure.

[0011] Furthermore, the first connection portion and the second connection portion are both arranged at an angle with the body.

[0012] Based on the same inventive concept, the present invention also provides a high-voltage component installed by the above-mentioned auxiliary tooling, including a positive output copper bar and a negative output copper bar, the positive output copper bar and the negative output copper bar both include a connected copper bar body and an output part, the copper bar body is provided with a connecting hole for connecting a current collecting plate, the output part is provided with a mounting hole, the mounting hole is used to accommodate a connector connecting the output part and the high-voltage output part and to accommodate the limiting boss.

[0013] Furthermore, the mounting hole is a waist-shaped hole, the major axis size of the waist-shaped hole is D+a, the minor axis size is D+b, a is greater than b, and D is the diameter of a bolt adapted to the mounting hole.

[0014] Furthermore, a is 2 mm to 3 mm, b is 1 mm to 2 mm; the hole diameter of the connecting hole is d+c, d is the diameter of the bolt matched with the connecting hole; and c is 1 mm to 2 mm.

[0015] Furthermore, the first copper bar and the second copper bar are hard bars; the material of the first copper bar and the second copper bar is red copper T2.

[0016] Furthermore, the copper busbar body and the output portion are an integrated structure, and the copper busbar body and the output portion are parallel and not coplanar.

[0017] Based on the same inventive concept, the present invention also provides an assembly method of the above-mentioned high-voltage assembly, comprising the following steps:

[0018] Connecting the first connection portion and the second connection portion of the auxiliary tooling to the air intake end plate and the blind end plate assembly respectively;

[0019] The mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar are respectively mounted on the corresponding limiting bosses to locate the mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar;

[0020] Connect the positive electrode output copper bar and the negative electrode output copper bar to the air inlet end collector plate and the blind end collector plate respectively;

[0021] The auxiliary tooling is removed and the installation of the high-voltage component is completed.

[0022] It can be seen from the above technical scheme that the auxiliary tooling provided by the present invention is used to install the high-voltage assembly of the fuel cell, which solves the technical problem that the high-voltage copper busbar and the high-voltage output member are difficult to assemble. The auxiliary tooling includes a body, a first connecting portion and a second connecting portion. The body is provided with a limiting boss adapted to the mounting hole of the positive output copper busbar and the mounting hole of the negative output copper busbar respectively; the first connecting portion and the second connecting plate are respectively connected to the first end and the second end opposite to the body, so that the two ends of the auxiliary tooling with a fixed size can be detachably fixedly installed on the intake end plate and the blind end plate assembly of the fuel cell respectively. At this time, the position of the limiting boss on the body is fixed. When installing the positive output copper busbar and the negative output copper busbar, the mounting hole and the limiting boss are first sleeved to first determine the position of the lower mounting hole, and then the positive output copper busbar / negative output copper busbar are connected to the corresponding collector plate. The auxiliary tooling uses the fixed size of the body as a reference to determine the position of the mounting holes of the positive output copper busbar and the negative output copper busbar, and realizes the auxiliary positioning function during the installation of the high-voltage copper busbar assembly.

[0023] The present invention provides a high-voltage component installed by the above-mentioned auxiliary tooling, the high-voltage component includes a positive output copper bar and a negative output copper bar, the positive output copper bar and the negative output copper bar both include a connected copper bar body and an output part, the copper bar body is provided with a connecting hole for connecting to a current collecting plate, the output part is provided with a mounting hole, the mounting hole is used to accommodate a connector connecting the output part and a high-voltage output component and to accommodate the limiting boss, during the assembly process, the mounting hole first accommodates an adaptive limiting boss provided on the main body of the auxiliary tooling, first determines the position of the mounting hole, the connecting hole on the copper bar body is rotated to an installation position connected to the current collecting plate with the limiting boss and the mounting hole as base points, after completing the connection between the copper bar body and the current collecting plate, the auxiliary tooling is removed, and when the output part is connected to the high-voltage output component, the connector is passed through the mounting hole.

[0024] The assembly method of the high-voltage assembly provided by the present invention comprises the following steps:

[0025] Connecting the first connection portion and the second connection portion of the auxiliary tooling to the air intake end plate and the blind end plate assembly, respectively, so as to determine the position of the limiting boss through the body of a fixed size;

[0026] The mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar are respectively mounted on the corresponding limiting bosses to locate the mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar;

[0027] Connect the copper bar bodies of the positive output copper bar and the negative output copper bar to the air inlet end collector plate and the blind end collector plate respectively;

[0028] The auxiliary tooling is removed and the installation of the high-voltage component is completed.

[0029] The high-voltage assembly assembly methods in the prior art all first connect the copper busbar to the corresponding collector plate. However, since there is a certain deviation between the actual assembly size and the theoretical size of the fuel cell stack in the stacking direction, in order to reduce the risk of the stack being unable to be assembled, the mounting holes connecting the high-voltage copper busbar and the collector plate are all set to a fault-tolerant structure, which results in the installed high-voltage copper busbar having a deviation in position and / or angle, making the position deviation between the connection hole and the high-voltage output part large and the assembly difficulty great. Different from the prior art, the assembly method provided by the present invention uses a fixed-size auxiliary tooling as a reference, and first determines the position of the mounting hole of the output part through a limiting structure, and then rotates the copper busbar with the mounting hole as the base point and connects the copper busbar and the collector plate. In the process, the position of the mounting hole is fixed by a limiting boss, and no large deviation occurs, thereby ensuring that the high-voltage assembly can be smoothly connected to the high-voltage output part after the auxiliary tooling is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is an axonometric schematic diagram of the auxiliary tooling provided in Example 1 of the present invention;

[0031] Figure 2 for Figure 1 A schematic front view of the auxiliary tooling in FIG.

[0032] Figure 3 A schematic diagram of a high-voltage assembly provided in Example 2 of the present invention being installed by the auxiliary tooling of Example 1;

[0033] Figure 4 for Figure 3 A front view schematic diagram of

[0034] Figure 5 for Figure 3 Schematic diagram of top view;

[0035] Figure 6 for Figure 3 Schematic side view of .

[0036] Description of the drawings: 100-auxiliary tooling, 110-main body, 111-limiting boss, 120-first connecting part, 130-second connecting part; 210-positive output copper busbar, 220-negative output copper busbar, 230-copper busbar body, 231-connecting hole, 240-output part, 241-mounting hole; 300-blind end collector plate; 400-intake end collector plate; 500-blind end end plate assembly; 600-intake end plate; 700-accommodating groove. DETAILED DESCRIPTION

[0037] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0038] In order to solve the technical problem of the difficulty in assembling the copper busbar of the high-voltage component and the high-voltage output component, i.e., the high-voltage through-terminal in the prior art. The present invention provides an auxiliary tooling, a high-voltage component, and an assembly method, which uses the fixed size and the limiting boss on the tooling as a reference to determine the position of the positive output copper busbar and the negative output copper busbar and locate the mounting holes of the positive output copper busbar and the negative output copper busbar, thereby ensuring the assembly position of the mounting holes and the high-voltage output component. The contents of the present invention are described in detail through three specific embodiments below:

[0039] Example 1

[0040] In order to solve the technical problem of the difficulty in assembling the high-voltage copper busbar and the high-voltage output components in the prior art, the present embodiment provides an auxiliary tooling 100 for installing the high-voltage components of the fuel cell. The auxiliary tooling 100 includes a main body 110, a first connecting portion 120 and a second connecting portion 130. The main body 110 is provided with a limiting boss 111 which is respectively adapted to the mounting hole 241 of the positive output copper busbar 210 and the mounting hole 241 of the negative output copper busbar 220; the first connecting portion 120 and the second connecting plate are respectively connected to the first and second ends opposite to the main body 110, so that the two ends of the auxiliary tooling 100 of a certain size can be detachably fixedly installed on the intake end plate 600 and the blind end plate assembly 500 of the fuel cell, respectively. At this time, the limiting boss 111 on the main body 110 is fixed in position, and when the positive output copper busbar 210 and the negative output copper busbar 220 are installed, the limiting boss 111 is fixed in position. When installing the positive output copper bar 210 and the negative output copper bar 220, firstly sleeve the mounting hole 241 and the limiting boss 111 to determine the position of the lower mounting hole 241, and then connect the positive output copper bar 210 / negative output copper bar 220 with the corresponding current collecting plate. The auxiliary tooling 100 uses the fixed size of the main body 110 as a reference to determine the position of the mounting hole 241 of the positive output copper bar 210 and the negative output copper bar 220, and realize the auxiliary positioning function during the installation of the high-voltage copper bar assembly.

[0041] In order to further ensure the positioning of the positive output copper bus 210 and the negative output copper bus 220 by the main body 110, in this embodiment, preferably, the limiting boss 111 is a stepped shaft, and the small shaft section of the stepped shaft is used to pass through the mounting hole 241, and the step surface of the stepped shaft abuts against the side of the positive output copper bus 210 / negative output copper bus 220 to limit the copper bus axially.

[0042] The present invention does not specifically limit the structure of the auxiliary tooling 100, which may be an integrated structure or a split structure. To ensure accurate positioning, preferably, the main body 110, the first connecting portion 120 and the second connecting portion 130 are an integrated structure so that the auxiliary tooling 100 is of a fixed size as a whole.

[0043] The present embodiment does not specifically limit the material of the auxiliary tooling 100 . Preferably, the material of the auxiliary tooling 100 is aluminum alloy.

[0044] In order to connect the air intake end plate 600 and the disc spring support plate of the blind end plate assembly 500, in this embodiment, through holes for installing threaded fasteners are provided on the first connection part 120 and the second connection part 130. It should be noted that when the auxiliary tooling 100 is used, the air intake end plate 600 and the blind end plate assembly 500 of the fuel cell stack have been connected and fixed by the fastening assembly. In order to connect the auxiliary tooling 100, threaded holes are provided on the air intake end plate 600 and the disc spring support plate. In order to ensure the smooth installation of the auxiliary tooling 100 of a certain size, preferably, the fastening assembly of the fuel cell stack adopts a tie rod.

[0045] In order to control the thickness and weight of the auxiliary tooling 100 and avoid abutment between the main body 110 and other structures of the fuel cell stack, in this embodiment, preferably, the first connecting portion 120 and the second connecting portion 130 are both arranged at an angle to the main body 110 .

[0046] In order to facilitate processing and forming, as a preferred embodiment, the first connection part 120 and the second connection part 130 are both perpendicular to the body 110. Since the available space is limited after the fastening assembly is installed in the battery stack, in this embodiment, the first connection part 120 and the second connection part 130 are connected to the same side of the body 110, that is, a folded structure is formed. In order to ensure the connection strength, preferably. The body 110 and the first connection part 120 and the second connection part 130 are connected by an arc transition.

[0047] The present invention does not specifically limit the height between the first connection part 120 and the body 110 and the height between the second connection part 130 and the body 110, and can be adjusted according to the available space of the connection position of the fuel cell stack. For example, in this embodiment, due to the different thicknesses of the air intake end plate 600 and the disc spring support plate, the available thicknesses close to the core side after the tie rod is installed are different, so the first connection part 120 connected to the air intake end plate 600 is arranged in the non-accommodation groove 700 part of the air intake end plate 600, and the second connection part 130 is directly arranged in the accommodation groove 700 of the disc spring support plate, so that the height between the first connection part 120 and the body 110 is higher than the height between the second connection part 130 and the body 110.

[0048] Example 2

[0049] Based on the same inventive concept, this embodiment provides a high-voltage component installed by the above-mentioned auxiliary tooling 100, the high-voltage component includes a positive output copper bar 210 and a negative output copper bar 220, the positive output copper bar 210 and the negative output copper bar 220 both include a connected copper bar body 230 and an output part 240, the copper bar body 230 is provided with a connection hole 231 for connecting the current collecting plate, the output part 240 is provided with a mounting hole 241, the mounting hole 241 is used to accommodate a connector connecting the output part 240 and the high-voltage output part and to accommodate a limit The boss 111 and the mounting hole 241 are used to accommodate the matching limiting boss 111 provided on the main body 110 of the auxiliary tooling 100 during the assembly process. The position of the mounting hole 241 is first determined. The connecting hole 231 on the copper busbar main body 110 is rotated to the installation position connected to the collector plate based on the limiting boss 111 and the mounting hole 241. After the connection between the copper busbar main body 110 and the collector plate is completed, the auxiliary tooling 100 is removed. When the output part 240 is connected to the high-voltage output component, the connecting component is passed through the mounting hole 241.

[0050] In order to further improve the assemblability of the output part 240 and the high-voltage output member, in this embodiment, the mounting hole 241 is adaptively adjusted to improve fault tolerance. Specifically, the mounting hole 241 is a waist-shaped hole, the major axis size of the waist-shaped hole is D+a, and the minor axis size is D+b, where a is greater than b, and D is the diameter of the bolt adapted to the mounting hole 241, so as to reserve an assembly difference in the major axis and minor axis directions of the mounting hole 241.

[0051] After analysis, it is found that the assembly difference in the height direction is larger than the assembly difference along the length direction of the copper bar. In this embodiment, the short axis of the waist-shaped hole is along the stacking direction of the battery stack, that is, the length direction of the copper bar. Preferably, a is 2mm to 3mm, and b is 1mm to 2mm.

[0052] Similarly, in order to ensure fault tolerance of the connection between the current collecting plate and the copper busbar, in this embodiment, the hole diameter of the connection hole 231 is d+c, d is the diameter of the bolt matched with the connection hole 231; c is 1 mm to 2 mm.

[0053] In order to ensure the stable fixation of the copper busbar after the auxiliary tooling 100 is removed, in this embodiment, the number of connection holes 231 provided on the positive output copper busbar 210 and the negative output copper busbar 220 is more than 2, and generally 2 are selected, so that rotation is prevented to a certain extent through the two connection holes 231.

[0054] Since the positive output copper bar 210 and the negative output copper bar 220 in this embodiment have good fault tolerance performance, in this embodiment, the first copper bar and the second copper bar are hard bars. Optionally, the material of the first copper bar and the second copper bar is red copper T2.

[0055] To simplify assembly, in this embodiment, the copper busbar body 230 and the output portion 240 are an integrated structure, and the copper busbar body 230 and the output portion 240 are parallel and not coplanar, that is, the output portion 240 is folded and disposed on the copper busbar body 230 .

[0056] The relative position of the output part 240 and the copper busbar body 230 can be adjusted accordingly according to the specific installation position of the auxiliary tooling 100 on the battery stack, the relative position with the high-voltage component and the preset position of the high-voltage output component, and the present invention does not make specific limitations.

[0057] Example 3

[0058] The assembly method of the high-voltage assembly provided by the present invention comprises the following steps:

[0059] Connect the first connecting portion 120 and the second connecting portion 130 of the auxiliary tooling 100 to the air intake end plate 600 and the blind end plate assembly 500 respectively, so as to determine the position of the limiting boss 111 through the sized body 110;

[0060] The mounting holes 241 of the positive output copper bar 210 and the mounting holes 241 of the negative output copper bar 220 are respectively mounted on the corresponding limiting bosses 111 to locate the mounting holes 241 of the positive output copper bar 210 and the mounting holes 241 of the negative output copper bar 220;

[0061] Connect the copper bar bodies 230 of the positive electrode output copper bar 210 and the negative electrode output copper bar 220 to the air inlet end collector plate 400 and the blind end collector plate 300 respectively;

[0062] The auxiliary tooling 100 is removed and the installation of the high-voltage components is completed.

[0063] It should be noted that before installing the auxiliary tooling 100 , the fuel cell stack is already in a fastened state, that is, the air intake end plate 600 and the blind end plate assembly 500 are already connected by a tie rod (not shown in the figure) to obtain an assembled stack.

[0064] The high-voltage assembly assembly methods in the prior art all first connect the copper bar with the corresponding collector plate, but since there is a certain deviation between the actual assembly size and the theoretical size of the fuel cell stack in the stacking direction, in order to reduce the risk of the stack being unable to be assembled, the mounting holes 241 connecting the high-voltage copper bar and the collector plate are all set to a fault-tolerant structure, which results in the installed high-voltage copper bar having a deviation in position and / or angle, so that the position deviation between the connection hole 231 and the high-voltage output part is large and the assembly is difficult. Different from the prior art, the assembly method provided by the present invention uses a fixed-size auxiliary tooling 100 as a reference, and first determines the position of the mounting hole 241 of the output part 240 through a limiting structure, and then rotates the copper bar with the mounting hole 241 as the base point and connects the copper bar and the collector plate. In the process, the position of the mounting hole 241 is fixed by the limiting boss 111, and no large deviation occurs, thereby ensuring that the high-voltage assembly after the auxiliary tooling 100 is removed can be smoothly connected to the high-voltage output part.

[0065] To sum up, compared with the prior art, the auxiliary tooling, high-voltage component and assembly method provided by the present invention use auxiliary tooling of fixed size as a reference, and first determine the position of the mounting hole of the output part through a limiting structure, thereby ensuring the positioning between the mounting hole of the high-voltage copper busbar and the high-voltage output part during the assembly of the high-voltage component to the fuel cell stack, thereby solving the technical problem of the difficulty in assembling the high-voltage copper busbar and the high-voltage output part.

[0066] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0067] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. An auxiliary tooling, characterized in that: A high-voltage assembly for installing a fuel cell, wherein the auxiliary tooling comprises a main body, provided with a limiting boss respectively adapted to the mounting hole of the positive output copper bar and the mounting hole of the negative output copper bar; A first connecting portion, connected to the first end of the body, and used for detachably connecting to the air intake end plate; The second connecting portion is connected to the second end of the body and is used for detachable connection with the blind end plate assembly.

2. The auxiliary tooling according to claim 1, characterized in that: The limiting boss is a stepped shaft, the small shaft section of the stepped shaft is used to penetrate the mounting hole, and the step surface of the stepped shaft is used to limit the positive output copper bar / the negative output copper bar.

3. The auxiliary tooling according to any one of claims 1, characterized in that: The body, the first connecting portion and the second connecting portion are an integrated structure.

4. The auxiliary tooling according to any one of claims 1 to 3, characterized in that: The first connection portion and the second connection portion are both arranged at an angle with the body.

5. A high-voltage component installed by the auxiliary tooling according to any one of claims 1 to 4, characterized in that: It comprises a positive output copper bar and a negative output copper bar, each of which comprises a connected copper bar body and an output part, the copper bar body is provided with a connecting hole for connecting a current collecting plate, the output part is provided with a mounting hole, the mounting hole is used to accommodate a connector connecting the output part and a high-voltage output part and to accommodate the limiting boss.

6. The high-voltage component of a fuel cell according to claim 5, characterized in that: The mounting hole is a waist-shaped hole, the major axis size of the waist-shaped hole is D+a, and the minor axis size is D+b, a is greater than b, and D is the diameter of a bolt adapted to the mounting hole.

7. The high-voltage component of a fuel cell according to claim 6, characterized in that: The a is 2mm to 3mm, the b is 1mm to 2mm; the hole diameter of the connecting hole is d+c, d is the diameter of the bolt matched with the connecting hole; and the c is 1mm to 2mm.

8. The high-voltage component of a fuel cell according to any one of claims 5 to 7, characterized in that: The copper busbar body and the output part are an integrated structure, and the copper busbar body and the output part are parallel and not coplanar.

9. A method for assembling a high voltage assembly according to any one of claims 5 to 8, characterized in that: The steps include: Connecting the first connection portion and the second connection portion of the auxiliary tooling to the air intake end plate and the blind end plate assembly respectively; The mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar are respectively mounted on the corresponding limiting bosses to locate the mounting holes of the positive output copper bar and the mounting holes of the negative output copper bar; Connect the positive electrode output copper bar and the negative electrode output copper bar to the air inlet end collector plate and the blind end collector plate respectively; The auxiliary tooling is removed and the installation of the high-voltage component is completed.

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