Current collectors and batteries

Abstract

This invention discloses a current collector assembly and a battery. The current collector assembly includes a first current collector and a second current collector. The first current collector is adapted to be connected to a single-electrode plate and has a first through hole communicating with a gas-water passage on the single-electrode plate. The second current collector is arranged at a distance from the first current collector along the length of the single-electrode plate and is connected to the single-electrode plate. The first current collector has a first side and a second side along its thickness direction, and the first side is adapted to contact the reaction region on the single-electrode plate. The current collector assembly of this invention can simultaneously improve the corrosion resistance and conductivity of the current collector while reducing its manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of fuel cells, and in particular to a current collecting component and a battery. Background Art

[0002] In the electrochemical cell stack, a whole titanium plate or a gold-plated copper plate or a stainless steel plate is used as a current collector to supply power to the electrochemical cell stack. This current collector has good electrical conductivity, low resistivity, low ohmic loss, low heat generation, and helps to improve the overall performance and efficiency of the electrochemical cell stack. Summary of the invention

[0003] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0004] A current collector component for a fuel cell is disclosed in the related art, and the current collector component includes a first conductive plate, which is configured to form a wall of a fluid-restricted volume of the fuel cell, and a second conductive plate, which is in electrical contact with the first conductive plate. However, the inventor of the present application has found that the current collector component in the related art can only be provided with inlet and outlet holes on the side, but not on the front of the end plate, which limits the structural design. In addition, it is impossible to arrange inlet and outlet holes with large cross-sectional areas on the side, making it difficult to enlarge the stack.

[0005] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a current collector assembly that can simultaneously improve the corrosion resistance and conductivity of the current collector and reduce the manufacturing cost of the current collector.

[0006] The current collector assembly of the embodiment of the present invention includes: a first current collector, the first current collector is suitable for being connected to a monopolar plate, the first current collector is provided with a first through hole, the first through hole is connected to the gas-water passage on the monopolar plate, and the first current collector is a corrosion-resistant current collector; a second current collector, the second current collector and the first current collector are arranged at intervals in the length direction of the monopolar plate, the second current collector is connected to the monopolar plate, and the first current collector has a first side and a second side in its thickness direction, the first side is suitable for contacting the reaction zone on the monopolar plate, and the second current collector is a conductive current collector.

[0007] The current collector assembly of the embodiment of the present invention can simultaneously improve the corrosion resistance and conductivity of the current collector and reduce the manufacturing cost of the current collector.

[0008] In some embodiments, there are multiple first current collectors, the multiple first current collectors are arranged at intervals in the length direction of the monopolar plate, and the second current collector is between the multiple first current collectors.

[0009] In some embodiments, a second through hole and a third through hole are provided on the second current collector, the second through hole and the third through hole are arranged at intervals, the second through hole is used for passing a wire, and the third through hole is used for connecting the second current collector with a component that needs to be configured with the second current collector.

[0010] In some embodiments, a groove is disposed on the first current collector, and the groove is arranged around the first through hole.

[0011] In some embodiments, the current collector assembly further includes a seal, and the seal is disposed in the groove.

[0012] A battery according to an embodiment of the present invention includes: a battery stack, the battery stack including a plurality of monopolar plates, the plurality of monopolar plates being stacked and arranged in a height direction of the battery stack to form a battery stack; a first end plate and a second end plate, the first end plate and the second end plate being arranged at intervals in the height direction of the battery stack, and the battery stack is arranged between the first end plate and the second end plate; a first current collecting assembly and a second current collecting assembly, the first current collecting assembly and the second current collecting assembly being arranged at intervals in the height direction of the battery stack, and the first current collecting assembly being connected to one of the plurality of monopolar plates adjacent to the first end plate, and the second current collecting assembly being connected to one of the plurality of monopolar plates adjacent to the second end plate, and the first current collecting assembly and the second current collecting assembly being the current collecting assemblies described in any one of the above embodiments.

[0013] The battery according to the embodiment of the present invention can reduce the manufacturing cost of the battery while improving the corrosion resistance and conductivity of the collector.

[0014] In some embodiments, the unipolar plate has a reaction area thereon, and the first side is in contact with the reaction area.

[0015] In some embodiments, the size of the reaction zone in the length direction of the monopolar plate is D1, the size of the reaction zone in the width direction of the monopolar plate is D2, the size of the second current collector in the length direction of the monopolar plate is D3, the size of the second current collector in the width direction of the monopolar plate is D4, and D1≤D3, D2≤D4.

[0016] In some embodiments, a fourth through hole is provided on the monopolar plate, the fourth through holes on adjacent monopolar plates are connected to form the air-water passage, the first through hole is connected to the air-water passage, and the battery also includes a connector, the connector is connected to the first end plate or the second end plate, and the connector is connected to the air-water passage.

[0017] In some embodiments, the battery further includes a connector, which passes through the first end plate and the second end plate in sequence to connect the battery stack, the first current collecting assembly, the second current collecting assembly, the first end plate and the second end plate into a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the connection between the current collecting assembly and the monopolar plate in an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram of a first current collector in a current collector assembly according to an embodiment of the present invention.

[0020] Figure 3 It is a schematic structural diagram of a second current collector in a current collector assembly according to an embodiment of the present invention.

[0021] Figure 4 Schematic diagram of the structure of a battery in an embodiment of the present invention.

[0022] Figure 5 yes Figure 4 Front view of the battery shown in .

[0023] Figure 6 Schematic diagram of the structure of the monopolar plate in an embodiment of the present invention.

[0024] Reference numerals:

[0025] Current collecting assembly 100, first current collecting assembly 1000, second current collecting assembly 1001, battery 200,

[0026] first current collector 1, first through hole 11, groove 12,

[0027] The second current collector 2, the second through hole 21, the third through hole 22,

[0028] Fuel stack 3, monopolar plate 31, fourth through hole 311,

[0029] A first end plate 4 , a second end plate 5 , a joint 6 , a connecting piece 7 , a first insulating plate 8 , and a second insulating plate 9 . DETAILED DESCRIPTION

[0030] 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.

[0031] like Figure 1 The current collector assembly of the embodiment of the present invention includes a first current collector 1 and a second current collector 2.

[0032] The first current collector 1 is suitable for being connected to the monopolar plate 31 . A first through hole 11 is provided on the first current collector 1 . The first through hole 11 is connected to the gas-water passage on the monopolar plate 31 .

[0033] Specifically, Figure 1 and Figure 2 As shown, the first through hole 11 passes through the first current collector 1 in the up-down direction, there are multiple first through holes 11, and the multiple first through holes 11 are evenly spaced along the front-to-back direction. The number of the first through holes 11 is the same as the number of the air-water passages on the monopolar plate 31, and the first through holes 11 correspond one-to-one to the air-water passages.

[0034] The second current collector 2 is aligned with the first current collector 1 in the length direction of the monopolar plate 31 (eg Figure 1 The second current collector 2 is connected to the monopolar plate 31, and the first current collector 1 is arranged in a thickness direction (as shown in the left and right direction). Figure 1 The upper and lower directions shown in FIG. 3 ) have a first side and a second side, and the first side is suitable for contacting the reaction area on the unipolar plate 31 .

[0035] Specifically, Figure 1 and Figure 2 As shown, the first current collector 1 and the second current collector 2 are arranged at intervals in the left-right direction, the first through hole 11 on the first current collector 1 is connected to the gas-water passage in the battery stack 3 to ensure the gas-liquid circulation of the battery stack 3, and the lower side of the second current collector 2 is in contact with the reaction area on the monopolar plate 31 to supply power to the battery stack 3.

[0036] The collector assembly of the embodiment of the present invention is provided with a first collector 1 and a second collector 2, and the first collector 1 and the second collector 2 are arranged at intervals, the first through hole 11 on the first collector 1 is connected with the gas-water passage in the battery stack 3 so that the gas and liquid in the battery stack 3 can flow, and the gas-liquid fluid in the battery stack 3 flows through the first collector 1, and the gas-liquid flow will not contact the second collector 2, and the second collector 2 is used to supply power to the battery stack 3, thereby separating the functions of the first collector 1 and the second collector 2, thereby improving the corrosion resistance and conductivity of the collector, and since two collectors are provided, compared with providing an integral collector, the material cost of the collector can be reduced, thereby reducing the manufacturing cost of the collector. In addition, the damaged collector can be conveniently replaced according to the use of the collector, thereby improving the service life of the battery 200.

[0037] In some embodiments, there are multiple first current collectors 1 , and the multiple first current collectors 1 are arranged at intervals in the length direction of the monopolar plate 31 , and the second current collectors 2 are between the multiple first current collectors 1 .

[0038] Specifically, Figure 1As shown, there are two second current collectors 2, and two first current collectors 1 are arranged at intervals in the left-right direction, and the two first current collectors 1 have the same formation, structure and size. The second current collector 2 is located between the two first current collectors 1, and there is a gap between the left end face of the second current collector 2 and the right end face of the first current collector 1 located on the left, and there is a gap between the right end face of the second current collector 2 and the left end face of the first current collector 1 located on the right.

[0039] The current collecting assembly of the embodiment of the present invention can improve the flow efficiency of the gas-liquid fluid in the battery stack 3 by setting two first current collectors 1, thereby improving the overall performance of the battery 200. There is a gap between the second current collector 2 and the two first current collectors 1 to prevent the gas-liquid fluid in the battery stack 3 from contacting the second current collector 2, thereby ensuring the conductive performance of the second current collector 2 and further improving the overall performance of the battery 200.

[0040] In some embodiments, the second current collector 2 is provided with a second through hole 21 and a third through hole 22, which are arranged at intervals. The second through hole 21 is used to pass a wire, and the third through hole 22 is used to connect the second current collector 2 with a component that needs to be configured with the second current collector 2.

[0041] Specifically, Figure 1 and Figure 3 As shown, there are multiple second through holes 21, and the multiple second through holes 21 are divided into two groups. The number of second through holes 21 in the two groups of second through holes 21 is the same, and the two groups of second through holes 21 are arranged at intervals in the front-to-back direction, and the second through holes 21 in each group of second through holes 21 are evenly spaced in the left-to-right direction.

[0042] There are multiple third through holes 22, which are divided into two groups. The number of third through holes 22 in the two groups is the same, and the two groups of third through holes 22 are arranged at intervals in the front-to-back direction, and the third through holes 22 in each group of third through holes 22 are evenly spaced in the left-to-right direction.

[0043] The current collector assembly of the embodiment of the present invention facilitates the connection of the battery 200 by providing multiple second through holes 21, and facilitates the connection of the current collector assembly 100 with external components by providing multiple third through holes 22, thereby improving the assembly efficiency and connection stability of the current collector assembly 100.

[0044] In some embodiments, a groove 12 is provided on the first current collector 1 , and the groove 12 is arranged around the first through hole 11 .

[0045] Specifically, Figure 1 and Figure 2 As shown, the groove 12 is an annular groove 12 , which surrounds the outside of the first through hole 11 , and the annular groove 12 is arranged concentrically with the first through hole 11 .

[0046] Preferably, the current collector assembly 100 further includes a seal, which is disposed in the groove 12. It should be noted that the size and shape of the seal are adapted to the size and shape of the groove 12. In other words, when the seal is installed in the groove 12, the outer wall surface of the seal fits the inner wall surface of the groove 12, and the upper end surface of the seal is substantially flush with the upper end surface of the first current collector 1. For example, the seal may be a corrosion-resistant seal, which increases the service life of the seal and can also prevent leakage of gas-liquid fluid in the gas-water passage.

[0047] The current collector assembly of the embodiment of the present invention can improve the sealing between the current collector and the monopolar plate 31 by providing the groove 12 and the seal, avoid the leakage of corrosive gas and liquid fluid in the gas-water passage, and thus increase the service life of the current collector assembly 100 and the battery 200.

[0048] In some embodiments, the first current collector 1 is a corrosion-resistant current collector, and the second current collector 2 is a conductive current collector.

[0049] For example, the first current collector 1 may be made of titanium or other corrosion-resistant materials, and the second current collector 2 may be made of copper or other conductive materials.

[0050] In the current collector assembly of the embodiment of the present invention, the first current collector 1 is made of a corrosion-resistant material, and the second current collector 2 is made of a conductive material. Compared with the current collector with gold plating on the surface, the manufacturing cost is reduced, and the types of materials available for preparing the current collector are increased. Different types of materials can be selected for preparing the current collector for different batteries 200, and the pollution of the battery 200 and the current collector to the environment can also be reduced.

[0051] In some embodiments, the current collector assembly 100 also includes a first tube (not shown), which is inserted into the first through hole 11, and one end of the first tube can extend into the gas-water passage, thereby more effectively isolating the gas-liquid fluid in the battery stack 3, avoiding contact between the gas-liquid fluid and the first current collector 1, and improving the service life of the first current collector 1 and the service life of the battery 200.

[0052] Refer to the following Figures 1 to 3 The operating principle of the current collecting assembly according to the embodiment of the present invention is described.

[0053] The first current collector 1 is connected to the monopolar plate 31, and one end of the first through hole 11 is connected to the gas-water passage in the monopolar plate 31, and the other end of the first through hole 11 is connected to the outside so that the gas and liquid in the battery stack 3 can flow through the first through hole 11, and the second current collector 2 is connected to the monopolar plate 31, and the lower end face or the lower end face of the second current collector 2 is in contact with the reaction area on the monopolar plate 31 to supply power to the battery stack 3.

[0054] The battery 200 according to the embodiment of the present invention includes a battery stack 3 , a first end plate 4 , a second end plate 5 , a first current collecting assembly 1000 , and a second current collecting assembly 1001 .

[0055] The battery stack 3 includes a plurality of monopolar plates 31, and the plurality of monopolar plates 31 are arranged in a height direction of the battery stack 3 (eg Figure 4 The cells are stacked and arranged in the vertical direction (as shown in FIG. 1 ) to form a cell stack 3.

[0056] Specifically, Figure 4 As shown, the plurality of monopolar plates 31 are stacked and arranged in the up-down direction, and the plurality of monopolar plates 31 have the same size and shape.

[0057] The first end plate 4 and the second end plate 5 are arranged at intervals in the height direction of the fuel cell stack 3 , and the fuel cell stack 3 is disposed between the first end plate 4 and the second end plate 5 .

[0058] Specifically, Figure 4 As shown, the first end plate 4 is located above the second end plate 5 , and the shape and size of the first end plate 4 are the same as those of the second end plate 5 .

[0059] The first current collecting assembly 1000 and the second current collecting assembly 1001 are arranged at intervals in the height direction of the battery stack 3, and the first current collecting assembly 1000 is connected to a monopolar plate 31 adjacent to the first end plate 4 among the multiple monopolar plates 31, and the second current collecting assembly 1001 is connected to a monopolar plate 31 adjacent to the second end plate 5 among the multiple monopolar plates 31. The first current collecting assembly 1000 and the second current collecting assembly 1001 are the current collecting assemblies of any of the above-mentioned embodiments.

[0060] Specifically, Figure 4 As shown, the first current collector assembly 1000 is connected to the top monopolar plate 31, and the second current collector assembly 1001 is connected to the bottom monopolar plate 31, that is, the second current collector 2 in the first current collector assembly 1000 is connected to the top monopolar plate 31, and the first current collector 1 in the first current collector assembly 1000 is connected to the top monopolar plate 31, the second current collector 2 in the second current collector assembly 1001 is connected to the bottom monopolar plate 31, and the first current collector 1 in the second current collector assembly 1001 is connected to the bottom monopolar plate 31.

[0061] Preferably, a first insulating plate 8 is provided between the first end plate 4 and the first current collecting assembly 1000, and a second insulating plate 9 is also provided between the second end plate 5 and the second current collecting assembly 1001, that is, a first insulating plate 8 is provided between the lower end surface of the first end plate 4 and the first current collecting assembly 1000, and a second insulating plate 9 is provided between the upper end surface of the second end plate 5 and the second current collecting assembly 1001.

[0062] The upper end surface of the first insulating plate 8 contacts the lower end surface of the first end plate 4, the lower end surface of the first insulating plate 8 contacts the upper end surfaces of the first collector 1 and the second collector 2 in the first collector assembly 1000, the lower end surface of the second insulating plate 9 contacts the upper end surface of the second end plate 5, and the upper end surface of the second insulating plate 9 contacts the lower end surfaces of the first collector 1 and the second collector 2 in the second collector assembly 1001.

[0063] According to the battery 200 of the embodiment of the present invention, since the current collector assembly of the above embodiment is adopted, the manufacturing cost of the battery 200 can be reduced while improving the corrosion resistance and conductivity of the current collector.

[0064] In some embodiments, the unipolar plate 31 has a reaction area thereon, and the first side is in contact with the reaction area.

[0065] Specifically, Figure 6 and Figure 1 As shown, the projection of the reaction zone on the upper end surface of the monopolar plate 31 is generally rectangular, the second current collector 2 covers directly above the reaction zone, and the second current collector 2 is in contact with the reaction zone, so that power can be stably supplied to the battery stack 3.

[0066] In some embodiments, the size of the reaction zone in the length direction of the unipolar plate 31 is D1, the size of the reaction zone in the width direction of the unipolar plate 31 is D2, the size of the second current collector 2 in the length direction of the unipolar plate 31 is D3, the size of the second current collector 2 in the width direction of the unipolar plate 31 is D4, and D1≤D3, D2≤D4.

[0067] Specifically, Figure 1 and Figure 6 As shown, the size of the reaction zone in the left-right direction is smaller than the size of the monopolar plate 31 in the left-right direction, the size of the reactor in the front-to-back direction is smaller than the size of the monopolar plate 31 in the front-to-back direction, the size of the second current collector 2 in the left-to-right direction is smaller than the size of the monopolar plate 31 in the left-to-right direction, and the size of the second current collector 2 in the front-to-back direction is larger than the size of the monopolar plate 31 in the front-to-back direction.

[0068] In the battery 200 according to the embodiment of the present invention, when D1≤D3 and D2≤D4, the second current collector 2 completely covers the reaction area on the monopolar plate 31 , thereby ensuring that the second current collector 2 stably supplies power to the monopolar plate 31 .

[0069] In some embodiments, a fourth through hole 311 is provided on the monopolar plate 31, and the fourth through holes 311 on adjacent monopolar plates 31 are connected to form an air-water passage, the first through hole 11 is connected to the air-water passage, and the battery 200 also includes a connector 6, which is connected to the first end plate 4 or the second end plate 5, and the connector 6 is connected to the air-water passage.

[0070] Specifically, Figure 6 As shown, the number of the fourth through holes 311 is multiple, and the multiple fourth through holes 311 are divided into two groups. The two groups of fourth through holes 311 are arranged at intervals in the left-right direction. The two groups of fourth through holes 311 include multiple fourth through holes 311, and the fourth through holes 311 in each group of fourth through holes 311 are evenly spaced in the front-back direction, and the fourth through holes 311 are connected with the first through holes 11. The fourth through holes 311 on the two upper and lower adjacent monopolar plates 31 are connected to form an air-water passage. When the number of the fourth through holes 311 is multiple, the fourth through holes 311 on the two adjacent monopolar plates 31 correspond to each other one by one and are connected to each other to form multiple independent air-water passages.

[0071] like Figure 1 As shown, there are multiple joints 6, and the multiple joints 6 correspond one-to-one to the multiple gas-water passages. The joint 6 can be connected to the first end plate 4, or the joint 6 is connected to the second end plate 5, or the first end plate 4 and the second end plate 5 are both provided with a joint 6.

[0072] In the battery 200 of the embodiment of the present invention, the fourth through holes 311 on two adjacent monopolar plates 31 correspond to each other and are interconnected to form a plurality of independent gas-water passages, which can improve the gas-liquid flow efficiency of the battery stack 3, thereby improving the performance of the battery stack 3. By providing a joint 6, the gas-water passage is easily connected to the outside world, thereby improving the assembly efficiency of the battery 200.

[0073] In some embodiments, the battery 200 further includes a connector 7, which passes through the first end plate 4 and the second end plate 5 in sequence to connect the battery stack 3, the first current collecting assembly 1000, the second current collecting assembly 1001, the first end plate 4 and the second end plate 5 into a whole.

[0074] Specifically, Figure 4 As shown, there are multiple connectors 7, and the multiple connectors 7 are arranged at intervals in the left-right direction and the front-back direction. At least some of the connectors 7 pass through the first end plate 4, the first insulating plate 8, the second collector 2 in the first collector assembly 1000, the second collector 2 in the second collector assembly 1001, the second insulating plate 9 and the second end plate 5 in sequence to connect the battery 200 into a whole, thereby improving the stability and structural strength of the battery 200.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 current collecting assembly, characterized in that: include: A first current collector, the first current collector is suitable for being connected to the monopolar plate, the first current collector is provided with a first through hole, the first through hole is connected to the gas-water passage on the monopolar plate, and the first current collector is a corrosion-resistant current collector; A second current collector, wherein the second current collector and the first current collector are arranged at intervals in the length direction of the monopolar plate, the second current collector is connected to the monopolar plate, and the second current collector has a first side and a second side in the thickness direction thereof, the first side is suitable for contacting with the reaction area on the monopolar plate, and the second current collector is a conductive current collector; The number of the first current collectors is two, the two first current collectors are arranged at intervals in the length direction of the monopolar plate, and the second current collector is between the two first current collectors, and there is a gap between the left end face of the second current collector and the right end face of the first current collector located on the left, and there is a gap between the right end face of the second current collector and the left end face of the first current collector located on the right; The first current collector is provided with a groove, and the groove is arranged around the first through hole; Also included is a sealing member disposed in the groove.

2. The current collecting assembly according to claim 1, characterized in that: The second current collector is provided with a second through hole and a third through hole, which are arranged at intervals, the second through hole is used for passing a wire, and the third through hole is used for connecting the second current collector with a component that needs to be equipped with the second current collector.

3. A battery, characterized in that: include: A battery stack, the battery stack comprising a plurality of monopolar plates, wherein the plurality of monopolar plates are stacked and arranged in a height direction of the battery stack to form a battery stack; A first end plate and a second end plate, wherein the first end plate and the second end plate are arranged at intervals in a height direction of the battery stack, and the battery stack is arranged between the first end plate and the second end plate; A first current collecting assembly and a second current collecting assembly, wherein the first current collecting assembly and the second current collecting assembly are spaced apart in the height direction of the battery stack, and the first current collecting assembly is connected to one of the plurality of monopolar plates adjacent to the first end plate, and the second current collecting assembly is connected to one of the plurality of monopolar plates adjacent to the second end plate, and the first current collecting assembly and the second current collecting assembly are the current collecting assemblies described in any one of claims 1 to 2.

4. The battery according to claim 3, characterized in that The monopolar plate has a reaction area thereon, and the first side is in contact with the reaction area.

5. The battery according to claim 4, characterized in that The size of the reaction zone in the length direction of the monopolar plate is D1, the size of the reaction zone in the width direction of the monopolar plate is D2, the size of the second current collector in the length direction of the monopolar plate is D3, the size of the second current collector in the width direction of the monopolar plate is D4, and D1≤D3, D2≤D4.

6. The battery according to claim 5, characterized in that The monopolar plate is provided with a fourth through hole, the fourth through holes on adjacent monopolar plates are connected to form the air-water passage, and the first through hole is connected to the air-water passage. The battery further includes a connector, which is connected to the first end plate or the second end plate and communicates with the air-water passage.

7. The battery according to any one of claims 3 to 6, characterized in that: It also includes a connecting piece, which passes through the first end plate and the second end plate in sequence to connect the battery stack, the first collector assembly, the second collector assembly, the first end plate and the second end plate into a whole.

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