Stack-DCDC connection and fuel cell comprising same

Abstract

The present application relates to a stack-DCDC connector and a fuel cell comprising the same, the stack-DCDC connector comprising: a stack extension member and a DCDC extension member, the stack extension member and the DCDC extension member respectively extending from a stack and a DCDC; wherein a through hole is formed in the galvanic pile extension piece, and the galvanic pile extension piece is tightly attached to the DCDC extension piece; the DCDC extension piece is also provided with a fixing piece, and the fixing piece is arranged in the through hole of the galvanic pile extension piece in a penetrating manner and connects the galvanic pile extension piece with the DCDC extension piece, so that the galvanic pile is connected with the DCDC. The galvanic pile-DCDC connecting piece is large in current-carrying capacity, high in safety, high in reliability and high in fault tolerance of an assembly structure.

Description

Technical Field

[0001] The present application relates to the field of fuel cell technology, and in particular to a fuel cell stack-DCDC connector. Background Art

[0002] Due to the characteristics of its structure, the electricity generated by hydrogen fuel cells has problems such as low and unstable output voltage and large output power fluctuations. The output voltage of the hydrogen fuel cell must first be transformed and stabilized through a DCDC converter before it can stably and efficiently supply power to the subsequent circuits and loads.

[0003] In the prior art, the output of the fuel cell stack is connected to the DCDC input connector through a set of positive and negative electrode plug-ins through high-voltage wires. The current is relatively large, nearly 800A, and the wires are connected in parallel in two sets of 70 square meters.

[0004] Products based on existing technologies have the following disadvantages:

[0005] 1. Large current may cause poor contact risk when the plug-in is running for a long time.

[0006] 2. The cost of wires and plug-ins is high, which greatly increases the overall cost of the system.

[0007] 3. Since the wires and plug-ins are externalized, the overall engine system size increases.

[0008] Therefore, there is an urgent need in the art for a battery stack-DCDC connection structure that can overcome the above-mentioned defects. Summary of the invention

[0009] The purpose of the present application is to provide a battery stack-DCDC connector and a fuel cell including the connector, which has a large current carrying capacity, high safety and high reliability.

[0010] The present application discloses a battery stack-DCDC connector, comprising: a battery stack extension piece and a DCDC extension piece, wherein the battery stack extension piece and the DCDC extension piece extend from the battery stack and the DCDC respectively; wherein:

[0011] The stack extension piece is provided with a through hole and is closely fitted with the DCDC extension piece;

[0012] The DCDC extension piece also has a fixing piece, which is inserted into the through hole of the battery stack extension piece and connects the battery stack extension piece with the DCDC extension piece, thereby realizing the connection between the battery stack and the DCDC.

[0013] In a preferred example, the stack extension piece includes a positive electrode stack extension piece and a negative electrode stack extension piece;

[0014] The DCDC extension piece includes a positive DCDC extension piece and a negative DCDC extension piece; wherein,

[0015] The positive electrode stack extension piece and the positive electrode DCDC extension piece are in contact with each other; the negative electrode stack extension piece and the negative electrode DCDC extension piece are in contact with each other.

[0016] In a preferred example, the DCDC extension piece is deformable.

[0017] In a preferred example, a groove-shaped space is formed between the DCDC extension piece and the DCDC body.

[0018] In a preferred example, the stack extension piece and the stack are sealed by a rubber gasket.

[0019] In a preferred example, the DCDC extension piece is made of nickel-plated or silver-plated copper.

[0020] The present application also discloses a fuel cell including the stack-DCDC connector as described above.

[0021] In a preferred example, a sealing ring is provided around the stack-DCDC connector and between the stack of the fuel cell and the DCDC.

[0022] This application has at least the following technical effects:

[0023] 1. Copper busbar connection has large current carrying capacity, high safety and high reliability.

[0024] 2. Compared with the original external plug-in and external wire structure, internal copper busbars are used for direct connection, which improves the overall volume ratio of the system, saves space, and makes space utilization more reasonable and efficient.

[0025] 3. The copper busbar has a fast installation speed and a simple installation method, which can also greatly increase the installation speed, thereby saving a lot of labor costs and improving production efficiency.

[0026] 4. By eliminating high-voltage plug-ins and high-voltage wires, the connector of the present application saves more than one thousand yuan in manufacturing costs for each single product compared to the prior art.

[0027] 5. The DC end uses soft copper busbars, which have strong assembly structure fault tolerance and are more conducive to the assembly and coordination between the DC and the battery stack, thus improving production efficiency.

[0028] The specification of the present application records a large number of technical features, which are distributed in various technical solutions. If all possible combinations of technical features of the present application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of the present application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions should all be regarded as having been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be regarded as having been recorded because it is technically infeasible, and the solution of A+B+C+E should be regarded as having been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the battery stack-DCDC connector according to the present application.

[0030] Figure 2 It is a partial schematic diagram of the battery stack-DCDC connector according to the present application.

[0031] Description of reference numerals:

[0032] 1-DCDC; 101-positive DCDC copper busbar; 102-negative DCDC copper busbar;

[0033] 2-battery stack; 201-positive electrode battery stack copper bar; 202-negative electrode battery stack copper bar;

[0034] 600-seal ring; 800-rubber pad. DETAILED DESCRIPTION

[0035] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0036] Description of some concepts:

[0037] DCDC

[0038] That is, the DC-DC converter is an important part of the fuel cell vehicle power system. It is used for power conversion and can convert non-adjustable direct current (DC) power into direct current (or approximate direct current) power of different voltages.

[0039] The following is a brief description of some innovative aspects of the implementation methods of this application:

[0040] The battery stack-DCDC connector of this application is as follows Figure 1 As shown, it includes a stack extension extending from the stack and a DCDC extension derived from the DCDC. The DCDC extension includes a positive DCDC copper bar 101 and a negative DCDC copper bar 102. The stack extension includes a positive stack copper bar 201 and a negative stack copper bar 202. Among them, the stack extension is provided with a through hole.

[0041] The positive electrode stack copper bar 201 contacts the positive electrode DCDC copper bar 101, and the negative electrode stack copper bar 202 contacts the negative electrode DCDC copper bar 102. The copper bars of the same polarity of the stack and the DCDC are closely fitted to achieve docking of the copper bars of the same polarity.

[0042] The DCDC extension piece also has a fixing piece, which is preferably a screw, which is inserted into the through hole of the battery stack extension piece and connects the battery stack extension piece with the DCDC extension piece, thereby achieving the connection between the battery stack and the DCDC.

[0043] In an optional embodiment, the DCDC extension piece is deformable. The DCDC copper busbar is made of nickel-plated or silver-plated copper, so the DCDC copper busbar is flexible. Figure 2 As shown, the DCDC extension is bent 90 degrees to form a slot-shaped space with the DCDC body. This space is used for assembly tolerance. The flexible copper busbar of the DCDC and the rigid copper busbar of the battery stack are more suitable for screw assembly and locking, allowing a certain deviation in the structural assembly, achieving the advantage of easier assembly. Compared with the rigid connection of the battery stack and the DCDC, it overcomes the possible poor contact of the copper busbar and eliminates the defect of heating during high current operation.

[0044] In an optional embodiment, the stack extension piece is sealed with the stack by a rubber pad, which makes the stack cavity independently sealed, ensuring that gas (especially hydrogen) will not leak out of the stack body from the copper busbar.

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0046] The stack-DCDC connector of the present application is applied to vehicle-mounted fuel cells. A sealing ring is provided between the bottom of the DCDC and the top of the stack to ensure that the system meets IP67.

[0047] After the positive and negative screws of the DCDC are tightened, add a cover plate on its surface to ensure sealing.

[0048] A sealing ring is provided around the stack-DCDC connector between the fuel cell stack and the DCDC to ensure that there is no gas leakage between the DCDC and the stack.

[0049] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0050] This specification includes combinations of the various embodiments described herein. Individual references to "one embodiment" or a particular embodiment, etc., do not necessarily refer to the same embodiment; however, these embodiments are not mutually exclusive unless indicated as mutually exclusive or clear to those skilled in the art. It should be noted that the word "or" is used in this specification in a non-exclusive sense unless the context clearly indicates or requires otherwise.

[0051] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A battery stack-DCDC connector, characterized in that: include: A stack extension piece and a DCDC extension piece, wherein the stack extension piece and the DCDC extension piece extend from the stack and the DCDC respectively; wherein, The stack extension piece is provided with a through hole and is closely fitted with the DCDC extension piece; The DCDC extension piece also has a fixing piece, which is inserted into the through hole of the battery stack extension piece and connects the battery stack extension piece with the DCDC extension piece, thereby realizing the connection between the battery stack and the DCDC.

2. The battery stack-DCDC connector according to claim 1, characterized in that: The battery stack extension piece includes a positive battery stack extension piece and a negative battery stack extension piece; The DCDC extension piece includes a positive DCDC extension piece and a negative DCDC extension piece; wherein, The positive electrode stack extension piece and the positive electrode DCDC extension piece are in contact with each other; the negative electrode stack extension piece and the negative electrode DCDC extension piece are in contact with each other.

3. The battery stack-DCDC connector according to claim 1, characterized in that: The DCDC extension piece is deformable.

4. The battery stack-DCDC connector according to claim 1, characterized in that: A slot-shaped space is formed between the DCDC extension piece and the DCDC body.

5. The battery stack-DCDC connector according to claim 1, characterized in that: The stack extension piece and the stack are sealed by a rubber gasket.

6. The battery stack-DCDC connector according to claim 1, characterized in that: The DCDC extension piece is made of nickel-plated or silver-plated copper.

7. A fuel cell, characterized in that: Comprising the battery stack-DCDC connector as described in any one of claims 1 to 6.

8. The fuel cell according to claim 7, wherein: A sealing ring is arranged around the stack-DCDC connector between the stack of the fuel cell and the DCDC.

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