Composite electrodes, end plate assemblies, and batteries

Abstract

A battery applicable to a vehicle includes a composite pole or end plate assembly. The composite pole includes a first electrode and a second electrode, the first electrode and the second electrode being electrically connected, the first electrode configured to electrically connect to a first battery cell, and the second electrode configured to electrically connect to a second battery cell. At least one of the first electrode and the second electrode is configured to connect to an end plate of the battery cell having a via hole, and at least one of the first electrode and the second electrode includes a pole and a connection assembly, the connection assembly being sleeved onto the pole and configured to connect to the end plate, the connection assembly mating with the pole to form a sealing structure, thereby closing the via hole on the end plate.

Description

Technical Field

[0001] Cross-reference to Related Applications This application claims priority to Chinese Patent Application No. 202211634801.4, entitled "Composite Electrode, End Plate Assembly, Battery and Vehicle", filed on December 19, 2022, the entire disclosure of which is incorporated herein by reference.

[0002] Technical Field This application relates to the field of battery technology, and more particularly, to a composite electrode, an end plate assembly having the composite electrode, and a battery having the end plate assembly.

Background Art

[0003] With the popularity of new energy vehicles, the requirements for the use of power batteries in new energy vehicles are becoming increasingly high. In related technologies, when a power battery pack is used, the battery has a problem that the electrolyte cannot be isolated, so the electrolyte cannot withstand high voltages.

Summary of the Invention

Means for Solving the Problems

[0004] This application intends to solve at least one of the technical problems in the related technologies to some extent. Therefore, an object of this application is to provide a composite electrode that forms a sealing structure between the electrode and the end plate to achieve electrical connection and isolate the electrolyte, so that the electrolyte can withstand high voltages.

[0005] Another object of this application is to provide an end plate assembly including the aforementioned composite electrode.

[0006] Yet another object of this application is to provide a battery including the aforementioned composite electrode.

[0007] A composite electrode according to one embodiment of the present application includes a first electrode and a second electrode, the first electrode and the second electrode being electrically connected, the first electrode configured to be electrically connected to a first battery cell, and the second electrode configured to be electrically connected to a second battery cell. At least one of the first electrode and the second electrode is configured to be connected to an end plate having via holes of a battery cell, and at least one of the first electrode and the second electrode includes an electrode and a connection assembly, the connection assembly being sleeve-mounted on the electrode and configured to be connected to the end plate, the connection assembly mating with the electrode to form a sealing structure, thereby closing the via holes on the end plate.

[0008] According to the composite electrode in this embodiment of the present application, a connection assembly suitable for closing via holes on the end plate is positioned between the electrode and the end plate, thereby forming a sealing structure between the electrode and the end plate to achieve electrical connection and isolate the electrolyte, and as a result the electrolyte can withstand high voltage.

[0009] In addition, the composite pole according to the above-described embodiment of this application may further have the following additional technical features.

[0010] In some examples of this application, the pole has a first end and a second end that are axially opposite to each other, and the first end of the pole is configured to be electrically connected to a battery cell in relation to a via hole on an end plate.

[0011] In some examples of this application, the connection assembly includes an insulating ring and an adapter plate. The insulating ring is sleeved onto the pole and fixedly connected and mated to the pole in a sealed manner, and the adapter plate is fixedly connected to the insulating ring and connected to an end plate.

[0012] In some examples of this application, the adapter plate is annular and arranged around the axial direction of the pole, and the inner diameter of the adapter plate is larger than the diameter of the pole, so that the adapter plate is spaced away from the pole, and the adapter plate is positioned on an insulating ring.

[0013] In some examples of this application, the difference between the inner diameter of the adapter plate and the diameter of the pole is in the range of 3 millimeters to 10 millimeters.

[0014] In some examples of this application, an insulating structure is placed between the adapter plate and the pole, and the insulating structure electrically isolates the adapter plate from the pole.

[0015] In some examples of this application, a first flange portion extending radially from the pole is positioned at a second end of the pole, the first flange portion forms an annular shape around the axial direction of the pole, and the first flange portion, insulating ring, and adapter plate are sequentially stacked and fixedly connected in the axial direction of the pole.

[0016] In some examples of this application, the insulating ring is a ceramic ring, and both the first flange portion and the adapter plate are fixed to the ceramic ring by welding.

[0017] In some examples of this application, the composite electrode further includes a first sampling member. The first electrode and the second electrode are respectively located on two opposing sides of the first sampling member, and the first electrode and the second electrode are electrically connected to the first sampling member, and the first sampling member is configured to be electrically connected to a sampling circuit.

[0018] In some examples of this application, the first electrode and the second electrode are arranged on two opposing sides of the first sampling member, and the first sampling member is in the shape of a sheet.

[0019] An end plate assembly according to one embodiment of the present application includes an end plate and the aforementioned composite pole. The end plate has a first side and a second side facing each other, and the end plate is provided with via holes. The connection assembly is stacked on the first side of the end plate, the first end of the pole extends from the via hole to the second side of the end plate and electrically connects to the battery cell body, and the connection assembly mates with the pole and closes the via hole.

[0020] According to this embodiment of the present application, the aforementioned composite electrode is used in the end plate assembly, thereby enabling electrical connection and isolation of the electrolyte, which helps to improve stability and safety during use.

[0021] In some examples of this application, a groove is provided on a first side surface of the end plate, the groove surrounds a via hole, and at least a portion of the connecting assembly is embedded in the groove.

[0022] A battery according to one embodiment of the present application includes a first battery cell, a second battery cell, and the composite electrode described above. The composite electrode is positioned between the first battery cell and the second battery cell, with the first electrode electrically connected to the first battery cell and the second electrode electrically connected to the second battery cell.

[0023] According to the battery in this embodiment of the present application, the use of the aforementioned composite electrode allows the electrolyte to be isolated, and as a result the electrolyte can withstand high voltage, thus helping to improve the safety of the battery.

[0024] In some examples of this application, the battery includes a battery cell body and the aforementioned end plate assembly. The end plate covers the ends of the battery cell body, and the first end of the pole is electrically connected to the battery cell body.

[0025] According to the battery in this embodiment of the present application, by using the aforementioned end plate assembly in the battery, electrical connection can be realized and the electrolyte can be isolated, which helps to improve the stability and safety during use.

Brief Description of the Drawings

[0026] [Figure 1] It is a schematic diagram of the structure of a composite electrode according to some embodiments of the present application. [Figure 2] It is a schematic diagram of the structure of a composite electrode according to some embodiments of the present application (showing the first electrode, the second electrode, and the first sampling member). [Figure 3] It is a schematic diagram of the structure of an end plate assembly according to some embodiments of the present application. [Figure 4] It is a cross-sectional view of an end plate assembly according to some embodiments of the present application. [Figure 5] It is a schematic diagram of the structure of a battery according to some embodiments of the present application.

Description of the Reference Numerals

[0027] 100: Battery, 10a: First electrode, 10b: Second electrode, 11: Electrode, 111: First flange portion, 112: Contact portion, 12: Connection assembly, 121: Insulating ring, 122: Adapter plate, 1221: First ring portion, 1222: Second ring portion, 1223: Connection portion, 13: Step portion, 20: End plate assembly, 211: End plate, 201: Via hole, 202: Concave groove, 30: Composite electrode, 33: First sampling member, 41: First battery cell, 42: Second battery cell.

Embodiments for Carrying Out the Invention

[0028] Embodiments of this application are described in detail below, and examples of embodiments are shown in the accompanying drawings. Throughout the accompanying drawings, identical or similar reference numerals indicate identical or similar elements, or elements having identical or similar functions. The embodiments described below with reference to the drawings are illustrative and are intended to illustrate this application and should not be construed as limiting this application.

[0029] Referring to Figures 1 to 5, a composite electrode 30 according to one embodiment of the present application may include a first electrode 10a and a second electrode 10b, the first electrode 10a being electrically connected to the second electrode 10b. The first electrode 10a is configured to be electrically connected to a first battery cell 41, and the second electrode 10b is configured to be electrically connected to a second battery cell 42, thereby achieving an electrical connection. Furthermore, at least one of the first electrode 10a and the second electrode 10b is configured to be connected to an end plate 211 of the battery cell having via holes 201, and at least one of the first electrode 10a and the second electrode 10b includes an electrode 11 and a connection assembly 12, the connection assembly 12 being sleeve-mounted on the electrode 11 and configured to be connected to the end plate 211, the connection assembly 12 mating with the electrode 11 to form a seal structure, thereby closing the via holes 201 on the end plate 211. Specifically, the connection assembly 12, which is suitable for closing the via hole 201 on the end plate 211, is positioned between the pole 11 and the end plate 211, thereby forming a sealing structure between the pole 11 and the end plate 211, thereby achieving an electrical connection and isolating the electrolyte.

[0030] According to the composite electrode 30 in this embodiment of the present application, when at least one of the first electrode 10a and the second electrode 10b is arranged as an electrode including an electrode 11 and a connecting assembly 12, the sealing structure formed by the fitting between the connecting assembly 12 and the electrode 11 is located between the first electrode 10a and the second electrode. Thus, the electrolyte can be isolated between the first electrode 10a and the second electrode 10b. Of course, alternatively, each of the first electrode 10a and the second electrode 10b can include an electrode 11 and a connecting assembly 12. This can further improve the effect of isolating the electrolyte and improve safety.

[0031] Figure 1 shows the structure of the first electrode 10a and the structure of the second electrode 10b. The structure of the first electrode 10a and the structure of the second electrode 10b may be the same. Specifically, the first electrode 10a may include a pole 11 and a connecting assembly 12, the second electrode 10b may also include a pole 11 and a connecting assembly 12, or each of the first electrode 10a and the second electrode 10b may include a pole 11 and a connecting assembly 12.

[0032] In some embodiments of this application, the pole 11 has a first end and a second end that are opposite to each other in the axial direction. As shown in Figure 1, the axial direction of the pole 11 is the left-right direction shown in the figure, the first end of the pole 11 may be the left end of the pole 11, and the second end of the pole 11 may be the right end of the pole 11.

[0033] The first end of the electrode 11 is configured to electrically connect to the battery cell via a via hole 201 on the end plate 211, and the connection assembly 12 is configured to be sleeve-mounted on the electrode 11 and connected to the end plate 211, and the connection assembly 12 mates with the electrode 11 to form a sealing structure, thereby closing the via hole 201 on the end plate 211. In other words, one end of the electrode 11 passes through the via hole 201 of the end plate 211 and is electrically connected to the battery cell, thereby achieving a conductive effect. However, the connection assembly 12 sleeve-mounted on the electrode 11 can close the via hole 201 on the end plate 211, thereby isolating the electrolyte, preventing electrolyte leakage, and improving the operational stability and safety of the electrode.

[0034] Referring to Figure 1, in some embodiments of this application, the connection assembly 12 includes an insulating ring 121 and an adapter plate 122. Specifically, the insulating ring 121 is sleeve-mounted on the pole 11 and fixedly connected and fitted to the pole 11 in a sealed manner, thereby improving connection stability, forming a sealing structure, and achieving an insulating effect. Furthermore, the adapter plate 122 is fixedly connected to the insulating ring 121 and configured to connect to the end plate 211. Specifically, the adapter plate 122 is connected separately to the insulating ring 121 and the end plate 211, and the adapter plate 122 is fixedly connected to the insulating ring 121. In this way, sealing between the pole 11 and the end plate 211 can be achieved via the connection assembly 12 without contact between the pole 11 and the end plate 211, which helps to improve the sealing effect.

[0035] The insulating ring 121 and the adapter plate 122 in this application may be arranged as a single unit or as separate units. For example, the adapter plate 122 and the insulating ring 121 may be formed integrally. Alternatively, the adapter plate 122 and the insulating ring 121 may be formed separately and then assembled together. The adapter plate 122 and the insulating ring 121 may also be made of the same material. Alternatively, the adapter plate 122 and the insulating ring 121 may be made of different materials. In this application, the insulating ring 121 may be made of ceramic material, the adapter plate 122 may be made of aluminum material, and the insulating ring 121 and the adapter plate 122 may be formed separately and connected to each other by welding.

[0036] In addition, the adapter plate 122 in this application is configured to connect to the end plate 211, thereby achieving a connection between the electrode and the end plate 211. For example, the adapter plate 122 may be stacked and welded to the end plate 211.

[0037] Referring to Figures 1 and 2, in some embodiments of this application, the adapter plate 122 is annular in shape to adapt to fit into the end plate 211 and the via hole 201 on the pole 11, and has high structural stability. Specifically, the adapter plate 122 is positioned around the pole 11 in the axial direction, and the inner diameter of the adapter plate 122 is larger than the diameter of the pole 11, so that the adapter plate 122 is spaced away from the pole 11, thereby avoiding contact between the pole 11 and the adapter plate 122 and preventing a short circuit. The adapter plate 122 is positioned on an insulating ring 121, which helps to improve the insulating effect by avoiding conductivity of the adapter plate 122.

[0038] In some embodiments of this application, the difference between the inner diameter of the adapter plate 122 and the diameter of the pole 11 is in the range of 3 to 10 millimeters, that is, the inner diameter of the adapter plate 122 must be larger than the diameter of the pole 11, and the difference between the inner diameter of the adapter plate 122 and the diameter of the outer surface of the pole 11 is 3 millimeters or more and 10 millimeters or less, so that the inner surface of the adapter plate 122 is spaced apart from the outer surface of the pole 11, thereby preventing electrical conduction from the adapter plate 122 to the pole 11. More specifically, a safe distance is set between the adapter plate 122 and the pole 11, thereby improving safety. For example, the difference between the inner diameter of the adapter plate 122 and the diameter of the pole 11 may be 5 millimeters, 8 millimeters, etc. In other words, a safe distance can ensure the safety of the electrodes and further prevent the gap between the adapter plate 122 and the pole 11 from becoming excessively large, thereby increasing the size of the battery 100.

[0039] Of course, based on the actual situation, the difference between the inner diameter of the adapter plate 122 and the diameter of the pole 11 can be set to less than 3 millimeters or more than 10 millimeters. For example, the difference between the inner diameter of the adapter plate 122 and the diameter of the pole 11 can be set to 2 millimeters or 12 millimeters. This application is not limited thereto.

[0040] Indeed, in this application, there may be several different methods of insulation between the adapter plate 122 and the pole 11. For example, an insulating structure may be placed between the adapter plate 122 and the pole 11, and the insulating structure improves the insulation and isolation effect by electrically isolating the adapter plate 122 from the pole 11. Specifically, an insulating barrier may be placed between the adapter plate 122 and the pole 11, and the insulating barrier is positioned to completely isolate the adapter plate 122 from the pole 11. In this case, if the insulating barrier has sufficient insulating performance, the adapter plate 122, the insulating barrier and the pole 11 can be stacked and fitted together, and there may be no gap between the adapter plate 122, the insulating barrier and the pole 11, or only a small gap may be provided.

[0041] Alternatively, the insulating structure may be arranged in a different form. For example, an insulating adhesive may be filled between the adapter plate 122 and the pole 11. In addition, the foregoing description is merely one of several specific implementation examples of this application and is not intended to constitute a limitation on the scope of protection of this application. Insulating structures of related art may also be applied to this application.

[0042] Referring to Figure 1, in some embodiments of this application, the stepped portion 13 is located at the first end of the pole 11, and the stepped portion 13 can improve the stability of the mating between the pole 11 and the battery cell, thus helping to improve structural stability.

[0043] Referring to Figures 1 and 2, in some embodiments of this application, a first flange portion 111 extending radially from the pole 11 is positioned at the second end of the pole 11, and the first flange portion 111 forms an annular shape around the axial direction of the pole 11. The first flange portion 111 can serve to support the end of the pole 11, thereby improving the structural stability of the pole 11. The first flange portion 111, the insulating ring 121, and the adapter plate 122 are sequentially stacked and fixedly connected in the axial direction of the pole 11. Thus, a multi-layer stacked structure can be formed in the axial direction, thereby improving structural strength, facilitating spatial arrangement, and facilitating improvement of the overall structural stability of the electrode. Specifically, the first flange portion 111 is connected to the other end of the pole 11 and extends radially annularly from the other end of the pole 11. The contact portion 112 is located on the side of the first flange portion 111, at the end of the side away from the pole 11, and is configured in a shape suitable for contact with the insulating ring 121. For example, the contact portion 112 is strip-shaped, and the side of the contact portion 112 is configured in a flat shape suitable for attachment to the outer surface of the insulating ring 121, thereby improving the stability of the connection between the first flange portion 111 and the insulating ring 121. In other words, when in use, the adapter plate 122, the insulating ring 121, and the contact portion 112 are stacked and connected in the axial direction of the pole 11. More specifically, there is a gap between the first flange portion 111 and the insulating ring 121, which helps to simplify the battery structure and reduce the battery weight.

[0044] In some embodiments of this application, the insulating ring 121 is a ceramic ring, and therefore the insulating ring 121 has good chemical and thermal stability, further improving corrosion resistance and preventing corrosion of the insulating ring 121 by the electrolyte. Specifically, both the first flange portion 111 and the adapter plate 122 are fixed to the ceramic ring by welding, which improves connection stability, and thus the welded connection helps to improve the sealing effect.

[0045] Furthermore, the insulating ring 121 may also be positioned to be connected to the pole 11 by welding.

[0046] Referring to Figures 2 and 4, in some embodiments of the present application, the composite electrode 30 further includes a first sampling member 33, wherein a first electrode 10a and a second electrode 10b are respectively positioned on two opposing sides of the first sampling member 33, and the first electrode 10a and the second electrode 10b are electrically connected to the first sampling member 33, and the first sampling member 33 is configured to be electrically connected to a sampling circuit. In other words, the first sampling member 33 for intermediate transition sampling is positioned between the first electrode 10a and the second electrode 10b, thereby helping to obtain a voltage between the first electrode 10a and the second electrode 10b, and facilitating the management and control of the composite electrode 30.

[0047] Optionally, the first sampling member 33 may be made of a metallic material to improve the conductive effect, for example, aluminum. Also, the electrodes 11 may be made of a metallic material. For example, the positive electrode may be made of aluminum, the negative electrode may be made of copper, or they may be made of the same material such as nickel or iron.

[0048] In some embodiments of this application, the first electrode 10a and the second electrode 10b are positioned on both sides of the first sampling member 33, so that the first sampling member 33 is directly connected to the first electrode 10a and the second electrode 10b. Furthermore, since the first sampling member 33 is sheet-like, it helps to increase the contact area between the first sampling member 33 and each of the first electrode 10a and the second electrode 10b, thereby improving the electrical connection effect, facilitating spatial arrangement, and helping to reduce the volume of the battery 100.

[0049] Referring to Figures 1 to 5, an end plate assembly 20 according to one embodiment of the present application may include an end plate 211 and the aforementioned composite pole 30. The end plate 211 has a first side and a second side that face each other. The first side of the end plate 211 may be the side facing away from the internal space of the battery cell body, and the second side of the end plate 211 may be the side facing the internal space of the battery cell body. Also, referring to Figure 4, the first side of the end plate 211 may be on the right side of the end plate 211, and the second side of the end plate 211 may be on the left side of the end plate 211.

[0050] The end plate 211 is provided with via holes 201, and the connection assembly 12 is stacked on the first side of the end plate 211. The first end of the pole 11 extends from the via hole 201 to the second side of the end plate 211 and is electrically connected to the battery cell body, and the connection assembly 12 mates with the pole 11 to close the via hole 201. In other words, the first end of the pole 11 may pass through the via hole 201 and be electrically connected to the battery cell body on the other side of the end plate 211. The second end of the pole 11 is located on the first side of the end plate 211, and the connection assembly 12 is sleeve-mounted on the pole 11 and serves to seal between the pole 11 and the first side of the end plate 211. Furthermore, the connection assembly 12 is connected to the first side of the end plate 211 in a stacking manner, thereby improving the sealing effect, improving the effect of isolating the electrolyte, and further improving connection stability.

[0051] According to the end plate assembly 20 in this embodiment of the present application, the poles 11 are sealed and connected on the first side of the plate 211 by using the connecting assembly 12, and the poles 11 are electrically connected to the battery cell body on the second side of the plate 211. As a result, the end plate assembly 20 is able to achieve electrical connection and isolate the electrolyte, which helps to improve stability and safety during use.

[0052] Referring to Figure 4, in some embodiments of this application, a groove 202 is provided on the first side surface of the end plate 211, the groove 202 surrounds the via hole 201, and at least a portion of the connection assembly 12 is embedded in the groove 202. Specifically, the groove 202 can improve the connection stability of the connection assembly 12 in the via hole 201, thereby helping to increase the contact area between the connection assembly 12 and the end plate 211. By embedding at least a portion of the connection assembly 12 in the groove 202, the sealing of the connection between the connection assembly 12 and the end plate 211 is improved, thereby helping to improve structural stability and sealing effect.

[0053] Referring to Figures 1 and 4, according to the end plate assembly 20 of this embodiment of the present application, the adapter plate 122 includes a first ring portion 1221, a second ring portion 1222, and a connecting portion 1223. The connecting portion 1223 is connected separately to the first ring portion 1221 and the second ring portion 1222 in the axial direction of the pole 11, and the connecting portion 1223 is connected between the first ring portion 1221 and the second ring portion 1222. The diameter of the first ring portion 1221 is larger than the diameter of the second ring portion 1222. During assembly, the first ring portion 1221 is embedded in the groove 202, the second ring portion 1222 is positioned on the first side surface of the end plate 211, and the second ring portion 1222 is connected to the insulating ring 121 in a stacking manner.

[0054] Referring to Figure 5, a battery 100 according to one embodiment of the present application includes a first battery cell 41, a second battery cell 42, and the composite electrode 30 described above. The composite electrode 30 is positioned between the first battery cell 41 and the second battery cell 42, with the first electrode 10a electrically connected to the first battery cell 41 and the second electrode 10b electrically connected to the second battery cell 42.

[0055] In some embodiments of this application, the housing is positioned around the periphery of the first battery cell 41 and the second battery cell 42 to be suitable for protecting the battery cells. The housing may be an aluminum housing.

[0056] According to this embodiment of the present application, the battery 100 is provided with the aforementioned composite electrode 30, which allows the electrolyte to be isolated and enables the electrolyte to withstand high voltage, thereby improving the safety of the battery 100.

[0057] The battery according to this embodiment of the present application includes a battery cell body and the aforementioned end plate assembly 20. The end plate 211 covers the terminal portion of the battery cell body and isolates the electrolyte. The end plate 211 can further perform a support and protection role, thereby improving the structural stability of the battery 100. In addition, one end of the pole 11 is electrically connected to the battery cell body, thereby achieving an electrical connection between the pole 11 and the battery cell.

[0058] According to the battery in this embodiment of the present application, the aforementioned end plate assembly 20 is used in the battery, the end plate 211 covers the terminal portion of the battery cell body, and the pole 11 is electrically connected to the battery cell body, thereby enabling electrical connection and isolation of the electrolyte, which improves the operational stability and safety of the battery.

[0059] The battery 100 according to this embodiment of the present application can be used in a vehicle. By using such a battery 100 in a vehicle, the driving safety of the vehicle can be improved.

[0060] In the description of this application, any orientation or positional relationship indicated by terms such as “inside,” “outside,” “axial,” “radial,” and “circumferential” is based on the orientation or positional relationship shown in the accompanying drawings and should be understood as being solely for the purpose of describing and simplifying the description of this application, and not to indicate or imply that a particular device or element necessarily has a particular orientation, or is constructed and operated in a particular orientation. Therefore, these terms should not be construed as limitations on this application.

[0061] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or implying relative importance, nor as implicitly indicating the quantity of the technical features described. Therefore, a feature defined by “first” or “second” may explicitly or implicitly include at least one such feature. In this description, “multiple” means at least two, e.g., two or three, unless specifically and clearly defined otherwise.

[0062] In this application, unless otherwise specifically specified and defined, terms such as “attachment,” “interconnection,” “connection,” and “fixing” should be understood in a broad sense, and may, for example, be a fixed connection, a removable connection, or an integral connection; may be a mechanical connection or an electrical connection; or, unless otherwise specifically defined, may be a direct connection, an indirect connection via an intermediate medium, an internal connection between two elements, or an interaction relationship between two elements. Those skilled in the art will be able to understand the specific meaning of these terms in this application based on the particular context.

[0063] In this application, unless otherwise explicitly specified and defined, the presence of a first feature "above" or "below" a second feature may mean that the first and second features are in direct contact, or that they are indirectly in contact through an intermediate medium. Furthermore, the presence of a first feature "on top of," "higher than," and "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply that the horizontal height of the first feature is greater than the horizontal height of the second feature. The presence of a first feature "below," "lower than," and "directly below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0064] In this specification, any reference to the terms “one embodiment,” “several embodiments,” “example,” “specific example,” or “several examples” means that certain features, structures, materials, or properties described with reference to this embodiment or example are included in at least one embodiment or example of this application. In this specification, the general expressions of the above terms are not necessarily specific to the same embodiment or example. Furthermore, certain features, structures, materials, or properties described may be appropriately combined in any one or more embodiments or examples. Furthermore, a person skilled in the art can integrate or combine different embodiments or examples and features of different embodiments or examples described herein, provided that they do not conflict with each other.

[0065] Although embodiments of this application have already been illustrated and described, it will be understood that these embodiments are illustrative and should not be understood as limitations of this application. Those skilled in the art can modify, alter, substitute, or change the embodiments within the scope of this application.

Claims

1. A composite electrode (30) comprising a first electrode (10a) and a second electrode (10b), wherein the first electrode (10a) is electrically connected to the second electrode (10b), the first electrode (10a) is configured to be electrically connected to a first battery cell (41), and the second electrode (10b) is configured to be electrically connected to a second battery cell (42), A composite electrode (30) wherein at least one of the first electrode (10a) and the second electrode (10b) is configured to connect to an end plate (211) of a battery cell having a via hole (201), and at least one of the first electrode (10a) and the second electrode (10b) comprises a pole (11) and a connection assembly (12), the connection assembly (12) being sleeve-mounted on the pole (11) and configured to connect to the end plate (211), the connection assembly (12) mating with the pole (11) to form a sealing structure, thereby closing the via hole (201) on the end plate (211).

2. The composite electrode (30) according to claim 1, wherein the electrode (11) has a first end and a second end that are axially opposite to each other, and the first end of the electrode (11) is configured to be electrically connected to the battery cell in relation to the via hole (201) on the end plate (211).

3. The aforementioned connection assembly (12) An insulating ring (121) is attached to the electrode (11) in a sleeve and is fixedly connected and fitted to the electrode (11) in a sealed manner, An adapter plate (122) is configured to be fixedly connected to the insulating ring (121) and connected to the end plate (211), A composite electrode (30) according to claim 2, comprising:

4. The composite pole (30) according to claim 3, wherein the adapter plate (122) is annular and is arranged around the pole (11) in the axial direction, and the inner diameter of the adapter plate (122) is larger than the diameter of the pole (11), so that the adapter plate (122) is spaced apart from the pole (11), and the adapter plate (122) is positioned on the insulating ring (121).

5. The composite electrode (30) according to claim 3 or 4, wherein the difference between the inner diameter of the adapter plate (122) and the diameter of the electrode (11) is in the range of 3 millimeters to 10 millimeters.

6. The composite electrode (30) according to claim 4, wherein the insulating structure is disposed between the adapter plate (122) and the electrode (11), and the insulating structure electrically isolates the adapter plate (122) from the electrode (11).

7. The composite pole (30) according to claim 3, wherein a first flange portion (111) extending radially from the pole (11) is positioned at the second end of the pole (11), the first flange portion (111) forms an annular shape around the pole (11) in the axial direction, and the first flange portion (111), the insulating ring (121), and the adapter plate (122) are sequentially stacked and fixedly connected in the axial direction of the pole (11).

8. The composite electrode (30) according to claim 7, wherein the insulating ring (121) is a ceramic ring, and both the first flange portion (111) and the adapter plate (122) are fixed to the ceramic ring by welding.

9. The composite electrode (30) further comprises a first sampling member (33), wherein the first electrode (10a) and the second electrode (10b) are arranged on both sides of the first sampling member (33), the first electrode (10a) and the second electrode (10b) are electrically connected to the first sampling member (33), and the first sampling member (33) is electrically connected to a sampling circuit. The composite electrode (30) according to claim 1.

10. The composite electrode (30) according to claim 9, wherein the first electrode (10a) and the second electrode (10b) are arranged on two opposing sides of the first sampling member (33), and the first sampling member (33) is in the form of a sheet.

11. An end plate assembly (20), An end plate (211) having opposing first and second sides, and having a via hole (201) provided in the end plate (211), An end plate assembly (20) comprising a composite electrode (30) as described in claim 1, wherein the connection assembly (12) is stacked on the first side surface of the end plate (211), the first end of the electrode (11) extends from the via hole (201) to the second side surface of the end plate (211) to be electrically connected to the battery cell body, and the connection assembly (12) mates with the electrode (11) to close the via hole (201).

12. The end plate assembly (20) according to claim 11, wherein a groove (202) is provided on the first side surface of the end plate (211), the groove (202) surrounds the via hole (201), and at least a portion of the connecting assembly (12) is embedded in the groove (202).

13. Battery (100), A first battery cell (41) and a second battery cell (42), A composite electrode (30) as described in claim 1, wherein the composite electrode (30) is positioned between the first battery cell (41) and the second battery cell (42), the first electrode (10a) is electrically connected to the first battery cell (41), and the second electrode (10b) is electrically connected to the second battery cell (42), Battery (100).

14. The battery cell itself, The end plate assembly (20) according to claim 11 or 12, wherein the end plate (211) covers the end of the battery cell body, and the first end of the electrode (11) is electrically connected to the battery cell body. The battery (100) according to claim 13.

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