CN216435952U

CN216435952U - Pull rod assembly and electrochemical battery pack

Info

Publication number: CN216435952U
Application number: CN202122981104.3U
Authority: CN
Inventors: 曹少波; 钟飞; 李春花
Original assignee: Weishi Energy Technology Co Ltd
Current assignee: Weishi Energy Technology Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-05-03
Anticipated expiration: 2031-11-30

Abstract

The utility model provides a pull rod assembly and electrochemical battery group, pull rod assembly includes: a first tie bar, one end of which is connected to a first end plate of the electrochemical cell stack and the other end of which is configured as a first threaded hole; and a second pull rod, wherein a first end of the second pull rod is connected with a second end plate of the electrochemical battery pack, and a threaded section is arranged at the other end of the second pull rod and is connected with the first threaded hole. The utility model discloses aim at solving the unsuitable technical defect of pull rod length.

Description

Pull rod assembly and electrochemical battery pack

Technical Field

The utility model relates to an electrochemical battery pack technical field, in particular to pull rod assembly and electrochemical battery pack, including but not limited to fuel cell stack.

Background

Proton exchange membrane fuel cells rely on electrochemical reactions to convert chemical energy stored in a fuel gas (e.g., hydrogen) directly into electrical energy. Since the power generation of a single fuel cell is low, the fuel cell is generally designed in the form of a stack of a plurality of unit cells. After the stacking is completed, the gas port end plate and the blind end plate at both ends are connected by a tie rod.

After the galvanic pile is repaired for many times, the sealing rubber wire of the bipolar plate assembly gradually loses elasticity, and when the bipolar plate assembly is pressed and mounted again by using a design pressure value, the height of the galvanic pile is lower than the initial design height, so that the pull rod needs to have unsuitable length.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a draw bar assembly and electrochemical battery group, aim at solving the unsuitable technical defect of pull rod length.

The utility model provides a draw bar assembly for electrochemical battery group, include:

a first tie rod, one end of which is connected with a first end plate of the electrochemical battery pack, and the other end of which is configured as a first threaded hole; and

and the first end of the second pull rod is connected with the second end plate of the electrochemical battery pack, and the other end of the second pull rod is provided with a threaded section matched with the first threaded hole.

In some embodiments, the second tie rod includes a body and the threaded section is connected to an end of the body facing the first tie rod; the cross section of the body is a circular cross section, and the diameter of the threaded section is smaller than that of the body.

In some embodiments, the axial length of the thread segments is 10 to 30 mm.

In some embodiments, the tie rod assembly further comprises: a shim disposed within the axial spacing of the first tie rod and the body.

In some embodiments, the spacer is sleeved outside the threaded section.

In some embodiments, the first pull rod is circular in cross-section.

In some embodiments, an end of the first tie rod facing away from the second tie rod is configured with a second threaded hole.

In some embodiments, an end of the second tie rod facing away from the first tie rod is configured with a third threaded hole.

The utility model also provides an electrochemical battery pack, include: a first end plate; the first end plate and the second end plate are arranged at intervals; the galvanic pile is arranged in the interval between the first end plate and the second end plate; and a tie rod assembly as previously described.

In the technical scheme of the utility model, the pull rod component comprises a first pull rod and a second pull rod; one end of the first pull rod is connected with the first end plate, and one end of the second pull rod is connected with the second end plate. The other end of the first pull rod is constructed into a first threaded hole, and the other end of the second pull rod is constructed into a threaded section matched with the first threaded hole. During assembly, the effective length of the pull rod assembly can be adjusted through the rotary connection of the threaded section and the first threaded hole, so that the distance between the first end plate and the second end plate is matched, and the technical problem that the length of the pull rod is suitable when the height of the fuel cell stack is lower than the initial design height is solved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic view of a drawbar assembly according to the present invention;

fig. 2 is a schematic view of a second pull rod according to the present invention;

fig. 3 is a schematic view of a first pull rod provided by the present invention;

fig. 4 is a schematic view of a gasket according to the present invention;

fig. 5 is a schematic diagram of an electrochemical cell stack according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

After the galvanic pile is repaired for many times, the sealing rubber wire of the bipolar plate assembly gradually loses elasticity, and when the bipolar plate assembly is pressed and mounted again by using a design pressure value, the height of the galvanic pile is lower than the initial design height, so that the pull rod needs to have unsuitable length. The length and the high adaptation of pull rod need be guaranteed in the pile reprocess.

In the related art, a pull rod is: a square pull rod is adopted, and first threaded holes are formed in two ends of the pull rod respectively. When the galvanic pile is firstly stacked, if the height of the galvanic pile exceeds the range of the design value, cutting is needed; when the pile is reprocessed and is caused the pile height to be less than the design value, the pull rod can the overlength, need cut the pull rod both ends, has the shortcoming of cutting inaccurately, and then pull rod length not adaptation. And the other pull rod is as follows: the cylindrical pull rod is designed by adopting a cylindrical rod, and both ends of the rod are provided with threads. When the galvanic pile is firstly stacked, if the height of the galvanic pile exceeds the range of the design value, cutting is needed; when the pile is repaired to cause the pile height to be lower than the design value, the pull rod can be overlong, the two ends of the pull rod need to be cut, the defect of inaccurate cutting also exists, and then the length of the pull rod is not matched.

To this end, referring to fig. 1 to 3 and 5, the present invention provides a pull rod assembly 10 for an electrochemical battery pack, including:

a first tie bar 100, one end of the first tie bar 100 being connected to a first end plate 20 of the electrochemical cell stack, the other end of the first tie bar 100 being configured as a first screw hole 100 a; and

a second tie rod 200, wherein a first end of the second tie rod 200 is connected with the second end plate 30 of the electrochemical battery pack, and the other end of the second tie rod 200 is provided with a threaded section 200a matched with the first threaded hole 100 a.

In the technical solution of the present invention, the pull rod assembly 10 includes a first pull rod 100 and a second pull rod 200; one end of the first tie bar 100 is connected to the first end plate 20, and one end of the second tie bar 200 is connected to the second end plate 30. The other end of the first pull rod 100 is configured as a first threaded hole 100a, and the other end of the second pull rod 200 is configured as a threaded section 200a adapted to the first threaded hole 100 a. During assembly, the effective length of the tie rod assembly 10 can be adjusted by the rotary connection of the threaded section 200a and the first threaded hole 100a, so as to adapt to the spacing distance between the first end plate 20 and the second end plate 30, thereby solving the technical problem that the tie rod length is suitable when the height of the fuel cell stack 40 is lower than the initial design height.

The utility model provides a pull rod assembly 10, which is applied to an electrochemical battery pack; one preferred assembly process for an electrochemical cell stack may be: mounting the stack 40 on the first end plate 20, connecting the first pull rod 100 with the first end plate 20, and then assembling the threaded section 200a of the second pull rod 200 in the first threaded hole 100a of the first pull rod 100 according to the height; and connecting the second pull rod 200 with the second end plate 30, installing the second end plate 30 on the other side of the stack 40, and locking the first end plate 20 and the second end plate 30 to complete the assembly.

It should be noted that, as shown in fig. 2, a second threaded hole 100b is formed at an end of the first pull rod 100 facing away from the second pull rod 200. The second threaded hole 100b is connected to a predetermined threaded connector on the first end plate 20, so as to connect the pull rod assembly 10 to the first end plate 20. As shown in fig. 3, a third threaded bore 200b is formed in the end of the second tie rod 200 facing away from the first tie rod 100. The third threaded hole 200b is connected to a predetermined threaded connector on the second end plate 30, so as to connect the drawbar assembly 10 to the second end plate 30.

The cross section of the first tie rod 100 is a circular cross section.

As an alternative to the above embodiment, as shown in fig. 3, the second pull rod 200 includes a body 200c and the threaded section 200a, and the threaded section 200a is connected to an end of the body 200c facing the first pull rod 100; the cross section of the body 200c is a circular cross section, and the diameter of the threaded section 200a is smaller than that of the body 200 c. Threaded segment 200a may be integrally connected to body 200c, and threaded segment 200a may also be welded to body 200 c. By rotating the body 200c, the depth of the threaded section 200a in the first threaded bore 100a can be adjusted, thereby adjusting the length of the pull rod assembly 10. Generally, the diameter of the body 200c is the same as the diameter of the first pull rod 100. The first threaded bore 100a is configured in the first pull rod 100 such that the threaded section 200a has a diameter smaller than the diameter of the body 200 c.

As an alternative to the above embodiment, the threaded section 200a has an axial length of 10 to 30 mm. Typically, the thread segments 200a have an axial length of 20 mm. Namely: the maximum adjustable length of the pull rod assembly 10 is 20mm, and the height of the galvanic pile 40 can be adjusted within 0 mm-20 mm.

As an alternative to the above embodiment, referring to fig. 1 and 4, the handle assembly 10 further includes: a shim 300, said shim 300 being disposed within the axial space between said first tie rod 100 and said body 200 c. Since the threaded section 200a has a certain axial length, when the length of the tie rod assembly 10 is adapted to the height of the stack 40, the end of the body 200c and the end of the first tie rod 100 are not completely attached, and the spacer 300 is disposed in the axial space between the body 200c and the first tie rod 100, so as to facilitate the locking of the length of the tie rod assembly 10 and protect the threaded structure of the threaded section 200 a.

As an alternative to the above embodiment, the spacer 300 is sleeved outside the threaded section 200 a. Generally, when it is desired to assemble the stack 40, the height of the stack 40 is measured, the length of the tie rod assembly 10 is determined according to the stack height, the depth of the threaded section 200a in the first threaded hole 100a is determined, and the thickness of the spacer 300 is determined. The spacer 300 is disposed at the end of the first pull rod 100 in advance, and the spacer 300 is sleeved outside the threaded section 200a as the threaded section 200a is screwed into the first threaded hole 100 a. When the body 200c abuts against the washer 300, the length of the drawbar assembly 10 reaches a predetermined length.

Specifically, the spacer 300 has a through hole, which is a generally circular through hole having a diameter greater than the diameter of the threaded section 200 a. Generally, the spacer 300 is a circular spacer 300 having a circular through hole, and the diameter of the spacer 300 is identical to the diameter of the first tie rod 100 and the diameter of the body 200c of the second tie rod 200.

As an alternative to the above embodiment, the gasket 300 is an elastic gasket 300. The elastic pad 300 can be deformed. The axial spacing between the body 200c and the first tie bar 100 is determined according to the actual stack 40 height, and therefore the thickness of the spacer 300 needs to be compatible with the axial spacing between the body 200c and the first tie bar 100. Typically, the shim 300 has different thickness specifications, such as 2mm, 4mm, 6mm, etc. And the axial spacing cannot be exactly on the thickness specification of 2mm, 4mm, 6mm and the like. Thus, gasket 300 is an elastomeric gasket 300. When the threaded section 200a is selected into the second pull rod 200, the body 200c may press the washer 300 such that the thickness and the axial interval of the washer 300 are suitable to each other, so that the length of the pull rod assembly 10 can be well locked.

The utility model discloses still provide an electrochemical battery group, shown in fig. 5, including first end plate 20, second end plate 30, galvanic pile 40 and draw bar assembly 10. In general, the electrochemical cell stack may be applied to a proton exchange membrane fuel cell. The specific structure of the drawbar assembly 10 refers to the above embodiments, and since the electrochemical battery pack adopts all technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the above embodiments are achieved, and no further description is given here.

Specifically, the first end plate 20 and the second end plate 30 are disposed at intervals. The axial direction of the drawbar assembly 10 is parallel to the direction in which the first end plate 20 points toward the second end plate 30. The stack 40 is comprised of a plurality of cells in the form of membrane electrode assemblies, bipolar plate assemblies, membrane electrode assemblies … …, bipolar plate assemblies, and membrane electrode assemblies. The first end plate 20 may be a gas port end plate and the second end plate 30 may be a blind end plate. Moreover, depending on the size of the stack 40, there may be multiple sets of tie rod assemblies 10 to increase the reliability of the connection.

The above is only the optional embodiment of the present invention, and not therefore the limit of the patent scope of the present invention, all of which are in the concept of the present invention, the equivalent structure transformation of the content of the specification and the drawings is utilized, or the direct/indirect application is included in other related technical fields in the patent protection scope of the present invention.

Claims

1. A tie rod assembly for an electrochemical cell stack, comprising:

a first tie bar, one end of which is connected to a first end plate of the electrochemical cell stack and the other end of which is configured as a first threaded hole; and

and the first end of the second pull rod is connected with a second end plate of the electrochemical battery pack, and the other end of the second pull rod is provided with a threaded section which is connected with the first threaded hole.

2. The handle assembly of claim 1, wherein the second handle includes a body and the threaded section is coupled to an end of the body facing the first handle;

the cross section of the body is a circular cross section, and the diameter of the threaded section is smaller than that of the body.

3. The handle assembly of claim 2, wherein the threaded section has an axial length of 10 to 30 mm.

4. The handle assembly of claim 2, further comprising:

a shim disposed within the axial spacing of the first tie rod and the body.

5. The handle assembly of claim 4, wherein the washer is disposed about the threaded section.

6. The handle assembly of claim 5, wherein the gasket is a resilient gasket.

7. The handle assembly of claim 1, wherein the cross-section of the first handle is a circular cross-section.

8. The handle assembly of claim 1, wherein an end of the first handle remote from the second handle is configured with a second threaded bore.

9. The handle assembly of claim 1, wherein an end of the second handle remote from the first handle is configured with a third threaded aperture.

10. An electrochemical cell stack, comprising:

a first end plate;

the first end plate and the second end plate are arranged at intervals;

the galvanic pile is arranged in the interval between the first end plate and the second end plate; and

the handle assembly of any of claims 1 to 8.