Bandage stack and fuel cell

Abstract

The invention discloses a bandage galvanic pile and a fuel cell, the bandage galvanic pile comprises a reactor core, an upper end plate, a lower end plate, an insulating backing plate and a bandage, the upper end plate and the lower end plate are respectively clamped at two ends of the reactor core, and the bandage binds the upper end plate, the reactor core and the lower end plate together along the side surface of the reactor core. The insulating base plate is arranged between the binding belt and the side surface of the reactor core and is connected with the upper end plate and the lower end plate; and heat dissipation holes are formed in the insulating base plate. According to the bandage electric pile disclosed by the invention, the insulating base plate with the heat dissipation holes is arranged between the pile core and the bandage, so that the problem of uneven temperature distribution of the electric pile is solved while the short circuit phenomenon is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a strapped battery stack and a fuel cell. Background Art

[0002] During the operation of the strapped battery stack, the core will generate more charges as the load voltage increases, so the probability of foreign matter adsorption will also increase. After long-term operation, foreign matter will gather between the single cells to form a "conductive medium bridge", which will cause the creepage distance between the single cells to be less than the safe distance and cause the battery short circuit. In addition, the distance between the strap and the core is small, so it is very necessary to apply an insulating sheet between the strap and the core for fixation.

[0003] However, the insulating sheet in the related art only plays the role of insulation protection and has a relatively simple function. Summary of the invention

[0004] The technical problem to be solved by the present invention is that, in view of the defects and shortcomings of the prior art, a strapped battery stack is proposed, in which an insulating pad with heat dissipation holes is arranged between the core and the straps, which avoids short circuit and improves the problem of uneven temperature distribution of the battery stack.

[0005] The strapped fuel cell stack of the embodiment of the present invention includes: a core, an upper end plate and a lower end plate, wherein the upper end plate and the lower end plate are respectively clamped at two ends of the core; an insulating pad and a strap, wherein the strap bundles the upper end plate, the core and the lower end plate together along the side of the core, the insulating pad is arranged between the strap and the side of the core and is connected to the upper end plate and the lower end plate, and the insulating pad is provided with heat dissipation holes.

[0006] In the strapped battery stack of the embodiment of the present invention, an insulating pad is arranged between the strap and the side of the core and is connected to the upper end plate and the lower end plate, and heat dissipation holes are provided on the insulating pad. Therefore, the insulating pad has the functions of both insulation protection and heat dissipation and cooling, which enriches the functionality of the insulating pad and improves the problem of uneven heat dissipation of the battery stack.

[0007] In some embodiments, the heat dissipation holes are multiple and arranged at intervals in a first direction, and the first direction is a direction from the upper end plate to the lower end plate.

[0008] In some embodiments, the plurality of heat dissipation holes include a top heat dissipation hole adjacent to the upper end plate, and a distance s between the top heat dissipation hole and the upper end plate satisfies 28.2 mm≤s≤33.3 mm.

[0009] In some embodiments, the heat dissipation holes are arranged in multiple rows in a second direction, and the second direction is perpendicular to the first direction.

[0010] In some embodiments, the spacing between adjacent heat dissipation holes gradually decreases in a direction approaching the lower end plate.

[0011] In some embodiments, the core includes opposite front side and back side, the binding strap is bundled around the front side and the back side, the insulating pad includes a front pad and a back pad, the front pad is covered on the front side, and the back pad is covered on the back side.

[0012] In some embodiments, the front pad includes a left pad and a right pad, the left pad and the right pad are connected in the circumferential direction of the core, and the side of the left pad facing the right pad has a rear collector plate folding ear groove extending in a direction away from the right pad, and the side of the right pad facing the left pad has a front collector plate folding ear groove extending in a direction away from the left pad.

[0013] In some embodiments, the back pad is provided with a mounting groove extending from the front end plate to the rear end plate, and the mounting groove is used to assemble a limiting rod.

[0014] In some embodiments, the front end plate and the lower end plate are provided with slots on their opposite sides, and the ends of the insulating pads fit into the slots and are fixed by connectors passing through the side walls of the slots.

[0015] The fuel cell of the embodiment of the present invention includes the strapped fuel cell stack described in any one of the above embodiments.

[0016] The fuel cell of the embodiment of the present invention adopts the above-mentioned banded stack, and the insulating pad is arranged between the band and the side of the core and is connected to the upper end plate and the lower end plate, and the insulating pad is provided with heat dissipation holes. Therefore, the insulating pad has the functions of insulation protection and heat dissipation cooling, which enriches the functionality of the insulating pad, improves the problem of uneven heat dissipation of the stack, and the fuel cell has good performance and long life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the front pad of the strapped battery stack according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the back pad of the strapped battery stack according to an embodiment of the present invention.

[0019] Figure 3 It is a schematic diagram of the distribution of heat dissipation holes on the insulating pad of the strapped battery stack according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic diagram of the assembly of the end plate and the insulating gasket of the strapped battery stack according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Upper end plate 1, core 2, lower end plate 3, binding strap 4, front pad 5, left pad 51, rear collector plate folding ear groove 511, right pad 52, front collector plate folding ear groove 521, back pad 6, mounting groove 61, connector 7, heat dissipation hole 8. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] like Figure 1-Figure 4 As shown, the strapped fuel cell stack according to the embodiment of the present invention includes a core 2 , an upper end plate 1 , a lower end plate 3 , an insulating pad and a strap 4 .

[0025] Specifically, the upper end plate 1 and the lower end plate 3 are respectively clamped at the two ends of the core 2, and the strap 4 bundles the upper end plate 1, the core 2 and the lower end plate 3 together along the side of the core 2. The insulating pad is arranged between the strap 4 and the side of the core 2 and connected to the upper end plate 1 and the lower end plate 3, and the insulating pad is provided with heat dissipation holes 8.

[0026] It can be understood that the insulating pad is isolated between the strap 4 and the core 2, so as to achieve insulation protection, avoid short circuit, and ensure the normal operation of the strapped battery stack. Secondly, since the heat dissipation holes 8 are provided on the insulating pad, the battery stack can be effectively cooled.

[0027] In the strapped battery stack of the embodiment of the present invention, the insulating pad is arranged between the strap 4 and the side of the core 2 and is connected to the upper end plate 1 and the lower end plate 3, and the insulating pad is provided with heat dissipation holes 8. Therefore, the insulating pad has the functions of insulation protection and heat dissipation cooling, which enriches the functionality of the insulating pad and improves the problem of uneven heat dissipation of the battery stack.

[0028] Furthermore, if Figure 3As shown, the heat dissipation holes 8 are multiple and arranged at intervals in the first direction, and the first direction is the direction from the upper end plate 1 to the lower end plate 3. It should be noted that in the operation test of the battery stack, referring to the temperature distribution of the battery stack operation, the temperature is low near the end plates at both ends, and the temperature is higher near the core 2. In addition, during the test operation of the battery stack, the water inflow at the front side of the battery stack is large, causing the single cell at the front end plate to be lower than the single cell at the rear end plate, causing the phenomenon of single low at the front end. In other words, the temperature distribution of the core 2 from the front end to the rear end is uneven. Therefore, the heat dissipation holes 8 are arranged in the direction from the upper end plate 1 to the lower end plate 3, so as to meet the heat dissipation needs of different positions and flexibly adjust the layout density of the heat dissipation holes 8. Specifically, the spacing between adjacent heat dissipation holes 8 gradually decreases in the direction close to the lower end plate 3, that is, the closer to the lower end plate 3, the greater the layout density of the heat dissipation holes 8, and the stronger the heat dissipation capacity, so as to match the requirements of large heat dissipation demand at the rear end of the battery stack and small heat dissipation demand at the front end.

[0029] Furthermore, considering the single low phenomenon at the head end of the stack, the heat dissipation hole 8 may not be set at the position closest to the upper end plate 1. Specifically, the multiple heat dissipation holes 8 include the top heat dissipation hole 8 adjacent to the upper end plate 1, and the distance s between the top heat dissipation hole 8 and the upper end plate 1 satisfies 28.2mm≤s≤33.3mm. In other words, there is an area at one end of the insulating pad adjacent to the upper end plate 1 where the heat dissipation hole 8 is not set, and the extension length of the area is between 28.2mm-33.3mm. Such a setting can better meet the heat dissipation requirements of the front end of the stack.

[0030] Furthermore, if Figure 3 The heat dissipation holes 8 are arranged in multiple rows in the second direction, and the second direction is perpendicular to the first direction. In other words, the heat dissipation holes 8 on the insulating pad are arranged in multiple rows and columns, with strong heat dissipation function and better heat dissipation uniformity.

[0031] In some embodiments, the core 2 includes opposite front side and back side, the binding band 4 is wrapped around the front side and back side, and the insulating pad includes a front pad 5 and a back pad 6, the front pad 5 is wrapped around the front side, and the back pad 6 is wrapped around the back side. It can be understood that the binding band 4 is wrapped around the perimeter, and the binding band 4 is at least opposite to the two side surfaces of the core 2 (i.e., the front side and the back side), and accordingly, the front pad 5 and the back pad 6 are respectively arranged at the front side and the back side to meet the insulation protection requirements.

[0032] In addition, it should be noted that the core 2 needs to lead out the front collector plate folding ear and the rear collector plate folding ear on the front side. Since the core 2 is first press-fitted with the upper end plate 1 and the lower end plate 3 and then the insulating gasket is set, the insulating gasket needs to be assembled against the core 2. At this time, the front collector plate folding ear and the rear collector plate folding ear will hinder the installation of the insulating gasket, resulting in the inability to implement the process. Based on this problem, the inventor of the present application proposed a segmented assembly scheme. Specifically, the front pad 5 includes a left pad 51 and a right pad 52. The left pad 51 and the right pad 52 are connected in the circumferential direction of the core 2, and the side of the left pad 51 toward the right pad 52 has a rear collector plate folding ear groove 511 extending in the direction away from the right pad 52, and the side of the right pad 52 toward the left pad 51 has a front collector plate folding ear groove 521 extending in the direction away from the left pad 51.

[0033] Therefore, by dividing the front pad 5 into two parts, the right pad 52 can be pushed from right to left along the front side during assembly. Since the folding ear groove 521 of the front current collecting plate is open to the left, the folding ear of the front current collecting plate can be directly inserted into the folding ear groove from the groove. Similarly, the left pad 51 can be pushed from left to right along the front side. Since the folding ear groove 511 of the rear current collecting plate is open to the right, the folding ear of the rear current collecting plate can be directly inserted into the folding ear groove from the groove, thereby avoiding the assembly interference problem of the folding ear of the current collecting plate on the insulating pad.

[0034] Furthermore, if Figure 2 As shown, the back pad 6 is provided with a mounting groove 61 extending from the front plate to the rear plate, and the mounting groove 61 is used to assemble the limit rod. It should be noted that when the strapped battery stack is assembled in a lying position, the setting of the limit rod can prevent the core 2 from "collapse" and ensure the function and service life of the battery stack.

[0035] Optionally, there are a plurality of mounting grooves 61 arranged at intervals in the width direction of the core 2 , and each mounting groove 61 is correspondingly equipped with a limiting rod.

[0036] Preferably, the mounting groove 61 includes a left mounting groove 61 and a right mounting groove 61 that are symmetrically arranged.

[0037] Furthermore, if Figure 4 As shown, the front end plate and the lower end plate 3 are provided with a slot on the sides opposite to each other, and the end of the insulating pad is fitted in the slot and fixed by a connector 7 passing through the side wall of the slot. It can be understood that when the insulating pad is assembled, its end can be slid and pushed along the slot, and after it is moved into place, the connector 7 is tightened and fixed. Preferably, the connector 7 is a bolt.

[0038] The fuel cell of the embodiment of the present invention includes the strapped fuel cell stack of the above embodiment.

[0039] The fuel cell of the embodiment of the present invention adopts the above-mentioned banded stack, and the insulating pad is arranged between the band 4 and the side of the core 2 and is connected to the upper end plate 1 and the lower end plate 3, and the insulating pad is provided with heat dissipation holes 8. Therefore, the insulating pad has the functions of insulation protection and heat dissipation cooling, enriching the functionality of the insulating pad, improving the problem of uneven heat dissipation of the stack, and the fuel cell has good performance and long life.

[0040] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0045] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A strapping battery stack, characterized in that: include: A core, an upper end plate and a lower end plate, wherein the upper end plate and the lower end plate are respectively clamped at two ends of the core; An insulating pad and a binding strap, wherein the binding strap binds the upper end plate, the core and the lower end plate together along the side of the core, the insulating pad is arranged between the binding strap and the side of the core and is connected to the upper end plate and the lower end plate, and the insulating pad is provided with heat dissipation holes.

2. The strapped battery stack according to claim 1, characterized in that: The heat dissipation holes are multiple and arranged at intervals in a first direction, and the first direction is a direction from the upper end plate to the lower end plate.

3. The strapped battery stack according to claim 2, characterized in that: The plurality of heat dissipation holes include a top heat dissipation hole adjacent to the upper end plate, and a distance s between the top heat dissipation hole and the upper end plate satisfies 28.2 mm≤s≤33.3 mm.

4. The strapped battery stack according to claim 2, characterized in that: The heat dissipation holes are arranged in multiple rows in a second direction, and the second direction is perpendicular to the first direction.

5. The strapped battery stack according to claim 2, characterized in that: The spacing between adjacent heat dissipation holes gradually decreases in a direction approaching the lower end plate.

6. The strapped battery stack according to claim 1, characterized in that: The core includes opposite front side and back side, the binding belt is wrapped around the front side and the back side, the insulating pad includes a front pad and a back pad, the front pad is covered on the front side, and the back pad is covered on the back side.

7. The strapped battery stack according to claim 6, characterized in that: The front pad includes a left pad and a right pad, the left pad and the right pad are connected in the circumferential direction of the core, and the side of the left pad facing the right pad has a rear collector plate folding ear groove extending in the direction away from the right pad, and the side of the right pad facing the left pad has a front collector plate folding ear groove extending in the direction away from the left pad.

8. The strapped battery stack according to claim 6, characterized in that: The back pad is provided with a mounting groove extending from the front end plate to the rear end plate, and the mounting groove is used for assembling a limiting rod.

9. The strapped battery stack according to claim 1, characterized in that: The front end plate and the lower end plate are both provided with slots on their opposite sides, and the end of the insulating pad is fitted in the slot and fixed by a connector passing through the side wall of the slot.

10. A fuel cell, characterized in that: It comprises a strapped battery stack according to any one of claims 1 to 9.

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