Pole structure, cover plate assembly, battery monomer, battery pack and electric device

Abstract

The utility model discloses a kind of pole structure, cover plate assembly, battery monomer, battery pack and electric equipment, it is related to power battery technical field.Pole structure includes: electrically conductive terminal, electrically conductive terminal is equipped with first through-hole;Pole body, part of pole body is cooperated in first through-hole;Composite connecting piece, at least part of composite connecting piece is located in first through-hole, composite connecting piece includes the first material part and the second material part connected, first material part is connected with pole body and is same material piece, second material part is connected with electrically conductive terminal and is same material piece.This kind of pole structure, solved the problem that pole is set to composite material piece in traditional scheme and is easy to break.Connection is stable, and excellent electrically conductive performance improves the reliability of battery.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, specifically to electrode structure, cover plate assembly, battery cell, battery pack and electrical equipment. Background Technology

[0002] In many existing technologies, battery terminals use composite terminals, which are components that connect the inside and outside of the battery. Taking a copper-aluminum composite terminal as an example, it includes an interconnected copper substrate and an aluminum substrate, with a composite connection surface formed between the aluminum substrate and the copper substrate. This composite connection surface is sealed and covered by a sealing element. The copper substrate is connected to the negative current collector inside the battery cell, and the aluminum substrate is connected to the external circuit of the battery.

[0003] Current copper-aluminum composite terminals are manufactured using methods such as machining copper-aluminum composite plates or copper-aluminum friction welding. In these processes, the assembly force is concentrated on the copper-aluminum composite surface, and this force is permanent. The continuous application of this force can lead to the breakage of the copper-aluminum composite terminal. Terminal breakage results in battery connection failure, compromising battery product safety.

[0004] Therefore, there is a need to improve the pole structure. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pole post structure to improve the problem of easy fracture of the composite surface under stress when using composite materials on pole posts.

[0006] This utility model also aims to provide a cover plate assembly, a battery cell, a battery pack, and an electrical device having the above-mentioned pole structure.

[0007] According to an embodiment of the utility model, the electrode structure includes: a conductive terminal for connecting to an external circuit of a battery, the conductive terminal having a first through hole; an electrode body, a portion of the electrode body being fitted into the first through hole; and a composite connector, at least a portion of the composite connector being located within the first through hole, the composite connector including a first material portion and a second material portion connected together, the first material portion being connected to the electrode body and being made of the same material, and the second material portion being connected to the conductive terminal and being made of the same material.

[0008] The electrode post structure according to the present invention solves the problem of electrode post breakage when the electrode post is made of composite material in conventional solutions. By placing the composite connector within the gap between the conductive terminal and the electrode post body, the composite connector is protected by both the conductive terminal and the electrode post body. When subjected to external impact, the impact force is more dispersed onto the conductive terminal and the electrode post body, and less impact force is experienced on the connection surface. During layered assembly on the battery cover assembly, the electrode post body bears the assembly force, and the connection surface between the first material part and the second material part can reduce or even avoid bearing the assembly force. Therefore, compared with the prior art, this electrode post structure makes the connection surface of the composite material less prone to breakage. As a result, the electrode post structure has a stable connection, excellent conductivity, and improves the reliability of the battery.

[0009] Furthermore, this application's solution changes the material transfer location from the electrode post to a composite connector on the outside of the electrode post body. This not only reduces the size of the parts requiring material composites, but also removes the processing limitations imposed by assembly forces, allowing for more low-cost processing methods. For example, it can be produced through pressing or stamping, resulting in high material utilization, low cost, and high production capacity. Of course, besides the composite connector, the conductive terminals and electrode post body can also be produced through pressing or stamping, or through other methods; no restrictions are placed here.

[0010] By moving the material composite location from the electrode post to the composite connector, the composite connector is prevented from contacting the electrolyte, thus reducing losses and improving reliability.

[0011] In some embodiments, the first material portion and the second material portion are both annular and spliced ​​along the axial direction of the pole body, and the connection surface between the first material portion and the second material portion is a metallurgical bonding surface.

[0012] In some embodiments, an outer welding assembly is formed between the conductive terminal and the electrode body, the outer welding assembly including at least one of a first welding portion, a second welding portion and a third welding portion;

[0013] The first welding part is located between the conductive terminal and the second material part, the second welding part is located between the conductive terminal and the first material part, and the third welding part is located between the pole body and the first material part.

[0014] In some embodiments, a first mounting platform is provided on the outer periphery of the pole body, and the first mounting platform is located in the first through hole;

[0015] The composite connector is sleeved on the pole body, and a first groove is provided on the inner circumferential surface of the composite connector, with the first mounting platform located in the first groove.

[0016] Specifically, the first mounting platform is a riveted mounting platform formed by riveting and is welded to the first material section.

[0017] Optionally, the conductive terminal is provided with a recessed groove surrounding the first through hole, and the recessed groove is located on at least one side of the conductive terminal.

[0018] In some embodiments, the first through hole includes an outer hole segment and an inner hole segment arranged sequentially along the axial direction, the diameter of the outer hole segment is larger than the diameter of the inner hole segment, an annular platform is formed between the outer hole segment and the inner hole segment, and the composite connector is connected to the annular platform.

[0019] Specifically, the composite connector is partially located in the outer hole section and partially located in the inner hole section, and the outer peripheral surface of the composite connector is provided with a second recessed groove that fits on the annular platform; or, the composite connector is completely located in the outer hole section.

[0020] In some embodiments, the electrode structure further includes a cell connector connected to one end of the electrode body away from the conductive terminal.

[0021] Specifically, the cell connector and the electrode body are an integral part, or the cell connector and the electrode body are connected by welding.

[0022] In some embodiments, there are at least two pole bodies, and the conductive terminal is provided with at least two corresponding first through holes, and each pole body is provided with a composite connector.

[0023] According to an embodiment of the present invention, a cover plate assembly includes: a light cover plate having a front side and a back side facing away from each other, and a second through hole; an electrode post structure according to the above embodiment, wherein a portion of the electrode post body is inserted and fitted into the second through hole, and the conductive terminal is located on the front side of the plate; and a sealing member disposed between the electrode post body and the light cover plate.

[0024] A battery cell according to an embodiment of the present invention includes: a housing having an opening; a battery cell located inside the housing; and a cover plate assembly according to embodiment 12 above, wherein the cover plate assembly is fitted at the opening, the conductive terminal is located on the side of the cover plate away from the battery cell, and the terminal body is electrically connected to the battery cell.

[0025] The battery pack according to an embodiment of the present invention includes the battery cells described in the above embodiments.

[0026] The electrical equipment according to the embodiments of the present invention includes a single battery cell as described in the above embodiments or includes a battery pack as described in the above embodiments.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a perspective view of the cover plate assembly according to some embodiments of the present utility model;

[0030] Figure 2 for Figure 1 An exploded view of the cover plate assembly shown;

[0031] Figure 3 for Figure 1 The cover plate assembly shown is a cross-sectional view in one direction;

[0032] Figure 4 for Figure 1 The cover plate assembly shown is a cross-sectional view from another direction;

[0033] Figure 5 for Figure 1 A cross-sectional view of the conductive cap in the illustrated embodiment;

[0034] Figure 6 for Figure 1 A cross-sectional view of the composite connector in the illustrated embodiment;

[0035] Figure 7 This is a perspective view of the cover plate assembly according to other embodiments of the present invention;

[0036] Figure 8 for Figure 7 The cover plate assembly shown is a cross-sectional view in one direction;

[0037] Figure 9 for Figure 7 The cover plate assembly shown is a cross-sectional view from another direction;

[0038] Figure 10 This is a cross-sectional view of a cover plate assembly according to some embodiments of the present invention;

[0039] Figure 11 This is a cross-sectional view of a cover plate assembly according to some embodiments of the present invention.

[0040] Figure label:

[0041] Cover assembly 100

[0042] 10. Pole column structure

[0043] Conductive terminal 1, first through hole 13, outer hole section 131, inner hole section 132, annular platform 133, recessed groove 15, composite connector 2, first material section 24, second material section 26, second recessed groove 27, first recessed groove 28.

[0044] 7. Pole post body, 71. Riveting hole, 72. First mounting platform, 74. Fourth welding part.

[0045] 8. Battery cell connector

[0046] Outer welding group A, first welding part 21, second welding part 22, third welding part 23

[0047] First insulating component 30, cover plate 40, front side of plate 41, back side of plate 42, second through hole 43, second insulating component 50, sealing component 60, explosion-proof valve protective membrane 91, rupture disc 92. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] In the description of this utility model, it should be understood that the terms "center," "thickness," "upper," "lower," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] The following is for reference. Figures 1-11 The pole post structure 10 according to an embodiment of the present utility model is described.

[0052] According to the pole post structure 10 of the utility model embodiment, referring to... Figures 1-3 It includes: conductive terminal 1, pole body 7 and composite connector 2.

[0053] The conductive terminal 1 is used to connect to the external circuit of the battery, and the conductive terminal 1 is provided with a first through hole 13. A portion of the electrode body 7 passes through and fits into the first through hole 13, and another portion of the electrode body 7 is used to pass through the battery cover plate 40 to connect the inside and outside of the battery. At least a portion of the composite connector 2 is located in the first through hole 13. The composite connector 2 includes a first material part 24 and a second material part 26 connected together. The first material part 24 is connected to the electrode body 7 and is made of the same material, and the second material part 26 is connected to the conductive terminal 1 and is made of the same material.

[0054] Understandably, the materials used for electrical connections inside and outside the battery differ in existing battery structures. Inside the battery, due to limited space, materials with high conductivity are typically used to reduce current loss and heat generation, thus mitigating the risk of overheating and potential battery explosion. However, the external space of the battery is larger, requiring larger circuit connection structures, making it difficult to control costs when using the same high-conductivity materials. Therefore, composite components are often incorporated into the battery to connect the internal and external circuit structures.

[0055] Previous designs used composite terminals, taking copper-aluminum composite terminals as an example. These terminals consist of interconnected copper and aluminum substrates, with a composite connection surface between them. The copper substrate, with its higher conductivity, connects the internal battery cells, while the aluminum substrate, with its relatively lower conductivity, connects the external circuitry. The terminals not only connect the internal and external circuitry but also complete the layered assembly of the cover plate structure. The assembly forces on the terminals tend to concentrate on the copper-aluminum composite surface. Furthermore, these assembly forces are permanent, and continuous application can cause the copper-aluminum composite terminals to break, leading to battery connection failure. Moreover, the copper-aluminum composite terminals not only require material bonding but also must withstand significant assembly forces. Conventional bonding methods struggle to meet these force requirements. Existing technologies often employ machining of copper-aluminum composite plates or copper-aluminum friction welding, resulting in high costs and low production capacity.

[0056] To solve the above problems, the pole structure 10 in this application is configured to include a conductive terminal 1, a pole body 7 and a composite connector 2. The conductive terminal 1 is used to connect the external circuit, and the pole body 7 is used to connect the internal circuit. In this way, the internal and external circuit connection structures are distributed on two parts instead of being concentrated on the pole body 7, which greatly reduces the load on the pole body 7.

[0057] At this point, a composite connector 2 is installed to facilitate material transition between the conductive terminal 1 and the electrode body 7. This allows the composite connector 2 to transfer materials when the internal and external circuit connection structures of the battery use different materials, ensuring smooth current flow.

[0058] In this application, by forming a first through hole 13 on the conductive terminal 1, at least a portion of the composite connector 2 and a portion of the electrode body 7 are located within the first through hole 13. At this time, the composite connector 2 is located in the gap between the conductive terminal 1 and the electrode body 7, and the composite connector 2 is protected by the conductive terminal 1 and the electrode body 7. When subjected to external impact, the impact force is more dispersed on the conductive terminal 1 and the electrode body 7, and less impact force is received on the connection surface.

[0059] Based on this, the connection surface between the first material portion 24 and the second material portion 26 of the composite connector 2 is at least partially located within the first through hole 13. During layered assembly on the battery cover assembly 100, the assembly force is borne by the electrode body 7, and the connection surface between the first material portion 24 and the second material portion 26 can reduce or even avoid bearing the assembly force. Therefore, compared to existing solutions, this electrode structure 10 of this application makes the connection surface of the composite material less prone to breakage. Consequently, the connection is stable, the conductivity is excellent, and the reliability of the battery is improved.

[0060] Furthermore, this application changes the material transfer location from the pole to the composite connector 2 on the outside of the pole body 7. The composite connector 2 does not need to be made into a large-sized structure like the traditional pole. In other words, compared with the existing technology, the parts that require material composites are not only smaller in size, but the processing of composite materials is no longer limited by assembly force, and more low-cost processing methods can be used. For example, they can be produced by pressing or stamping, such as the composite connector 2 being stamped from a copper-aluminum composite plate. Thus, the material utilization rate is high, the cost is low, and the production capacity is high.

[0061] Of course, this application does not limit the composite material parts to other more complex copper-aluminum composite processes such as friction welding and brazing. Copper-aluminum composite plates can be obtained by simple methods such as cold rolling, hot rolling, semi-molten rolling, and explosive welding.

[0062] Of course, in addition to the composite connector 2, the conductive terminal 1 and the pole body 7 can also be produced by pressing or stamping, or by other means, which is not limited here.

[0063] In addition, by moving the material composite position from the electrode post to the composite connector 2, the composite connector 2 is prevented from contacting the electrolyte, thus reducing losses and improving reliability.

[0064] It should be noted that the design of this application aims to solve the problem of how to transition the composite material on the electrode post. This application does not impose any restrictions on the materials of the first material part 24 and the second material part 26. Optionally, both the first material part 24 and the electrode post body 7 are made of copper. Optionally, both the second material part 26 and the conductive terminal 1 are made of aluminum.

[0065] Specifically, the first material part 24 and the electrode body 7 are both made of copper, and the connection between them is made of copper. The second material part 26 and the conductive terminal 1 are both made of aluminum, and the connection between them is made of aluminum. The connection of the same metal is reliable, the connection resistance is low, and a stable electrical transmission surface can be formed.

[0066] Because the raw material specifications of copper-aluminum composite plates need to be customized and can only be used for specific purposes, the material utilization rate is low. Therefore, copper-aluminum composite plates are not used as conductive terminals 1, nor as electrode bodies 7, but only as composite connectors 2. This utility model has wider applicability, and the composite connector 2 can be placed at any position on the conductive terminal 1, without being limited by the raw material specifications of copper-aluminum composite plates, the number and shape of electrodes, the shape of conductive terminals 1, etc., and the cost is lower.

[0067] In some embodiments, the negative electrode current collector inside the battery cell is made of copper foil. Therefore, the electrode body 7 uses copper to ensure the performance of the battery cell inside, enabling the battery to perform charging and discharging functions. The composite connector 2 then performs material conversion, overcoming the problems of heavy weight and high cost caused by using pure copper as the electrode in current power battery covers. Simultaneously, it avoids contact between the electrolyte and the aluminum material in the composite connector 2, improving the reliability of the copper-aluminum composite electrode. The conductive terminal 1 needs to be welded to the busbar during battery pack assembly. For the purposes of weight reduction and cost reduction, both are generally made of the same material, aluminum.

[0068] Of course, other materials can also be chosen. In addition to aluminum and copper, the composite connector 2 can also be made of titanium, nickel, or various alloy materials. Generally, the conductivity of the first material part 24 is higher than that of the second material part 26 when selecting materials.

[0069] In some embodiments, such as Figures 2-4As shown, both the first material section 24 and the second material section 26 are annular. This arrangement, where the first material section 24 surrounds the electrode body 7, allows for uniform circumferential distribution of force under stress, resulting in a strong load-bearing capacity and high structural strength. Similarly, the second material section 26 surrounds the electrode body 7, allowing for uniform circumferential distribution of force under stress, also contributing to a strong load-bearing capacity and high structural strength. Furthermore, the electrode body 7 conducts current to the first material section 24, the first material section 24 conducts current to the second material section 26, and the second material section 26 conducts current to the conductive terminal 1. Since adjacent current-conducting surfaces are annular, they have a large area and low current conduction loss.

[0070] Specifically, the first material part 24 and the second material part 26 are spliced ​​along the axial direction of the electrode body 7. This allows for control of the dimensions of the composite connector 2, eliminating the need for an excessively large diameter of the first through hole 13 and ensuring the structural strength of the conductive terminal 1. The axial splicing of the two parts also facilitates processing, and the resulting thin ring is easy to assemble. Furthermore, after the first material part 24 and the second material part 26 are spliced ​​along the axial direction of the electrode body 7, the direction of the assembly force borne by the electrode body 7 is aligned, preventing fluctuations in contact resistance due to external vibrations or impacts.

[0071] Specifically, the connection surface between the first material section 24 and the second material section 26 is a metallurgical bonding surface. Here, a metallurgical bonding surface refers to a bonding surface formed by the interdiffusion of atoms between two metals.

[0072] Specifically, a metallurgical interface refers to an interface in which two or more materials are bonded at the atomic level through metallurgical reactions (such as melting, diffusion, and chemical reactions). Its core characteristic is that there are no macroscopic gaps at the interface, and the atoms are tightly connected through chemical bonds or diffusion.

[0073] With this configuration, the connection surface between the first material section 24 and the second material section 26 can withstand large tensile stresses, shear stresses, and impact loads, and is less prone to interface separation due to external forces. It not only possesses good mechanical property continuity but also excellent sealing and barrier properties. More importantly, it avoids contact resistance or thermal resistance caused by poor contact in mechanical connections; therefore, this composite connector 2 exhibits good electrical and thermal conductivity.

[0074] The metallurgical bonding surface between the first material section 24 and the second material section 26 can be formed by welding, such as by fusion welding, where the material is melted at high temperature, and the molten base material or filler material solidifies after cooling to form a metallurgical bond. Under pressure (usually accompanied by heating), the material forms a bond through plastic deformation and atomic diffusion. Methods that can be used in pressure welding include diffusion welding and friction welding.

[0075] In addition, the first material section 24 and the second material section 26 perform powder metallurgy sintering. That is, different material powders are mixed, pressed into shape, and sintered at high temperature, and metallurgical bonding is formed between the powder particles through diffusion and fusion.

[0076] In some embodiments, an external welding assembly A is formed between the conductive terminal 1 and the electrode body 7, such as Figure 4 As shown, the outer welding assembly A includes at least one of a first welding part 21, a second welding part 22, and a third welding part 23. The first welding part 21 is located between the conductive terminal 1 and the second material part 26, the second welding part 22 is located between the conductive terminal 1 and the first material part 24, and the third welding part 23 is located between the pole body 7 and the first material part 24. That is, only the first welding part 21, only the second welding part 22, or only the third welding part 23 can be provided between the conductive terminal 1 and the pole body 7. Any combination of two of the first welding parts 21, the second welding part 22, and the third welding part 23 can be provided between the conductive terminal 1 and the pole body 7, and all three welding parts can be provided simultaneously. Through welding, the connection reliability and strength are high, the sealing performance is good, the pressure impact can be appropriately distributed, and the overall structural strength is improved.

[0077] Specifically, the conductive terminal 1 and the composite connector 2 are connected by laser welding to form a first welded part 21 and a second welded part 22. The composite connector 2 and the pole body 7 are connected by laser welding to form a third welded part 23.

[0078] Of course, the first welding part 21, the second welding part 22, and the third welding part 23 are a preferred solution. When the battery operating conditions are not demanding, it is also possible to omit welding connections at any of these welding parts. For example, the composite connector 2 can be connected between the conductive terminal 1 and the electrode body 7 by an interference fit.

[0079] In some embodiments, such as Figure 4 As shown, a first mounting platform 72 is provided on the outer periphery of the pole body 7, and the first mounting platform 72 is located within the first through hole 13. Since the pole body 7 needs to withstand the assembly force required for subsequent connection with structures such as the cover plate 40, the first mounting platform 72 provides a larger contact area between the pole body 7 and the outer periphery, enabling the pole body 7 to provide axial support and increasing connection stability. Alternatively, the first mounting platform 72 can be omitted, and its positioning can be achieved using fixtures or other technological means.

[0080] Specifically, the composite connector 2 is sleeved on the pole body 7, such as... Figure 6As shown, a first recessed groove 28 is provided on the inner circumferential surface of the composite connector 2, and a first mounting platform 72 is located in the first recessed groove 28. In this way, after the pole body 7 is engaged by the first mounting platform 72 and the first recessed groove 28, the assembly force is transmitted to the conductive terminal 1 through the composite connector 2, and then to the light cover plate 40, thereby tightly and firmly connecting the layer structure of the cover plate assembly 100.

[0081] Optionally, such as Figure 4 As shown, the connection surface between the first material section 24 and the second material section 26 can be located on the side of the bottom surface of the first sink 28 away from the light cover plate 40. The first material section 24, which has higher conductivity, occupies a smaller proportion, resulting in lower production costs.

[0082] Optionally, such as Figure 10 As shown, the connection surface between the first material section 24 and the second material section 26 can be located on the side of the bottom surface of the first sink 28 adjacent to the light cover plate 40. The first material section 24, which has higher conductivity, occupies a larger proportion, resulting in better product strength.

[0083] Specifically, the first mounting platform 72 is a riveted mounting platform formed by riveting and upsetting. That is, the pole body 7 acts like a rivet, connecting the layered structures of the cover plate assembly 100 by riveting it onto the pole body 7. The pole body 7 is directly riveted and upset at one end to form the first mounting platform 72. In other words, the cover plate assembly 100 utilizes the mechanical deformation of the pole body 7 during riveting to form a permanent connection. The joint is evenly stressed and not easily loosened by vibration, impact, or long-term load. Even in harsh environments such as high temperature, low temperature, and humidity, the connection state of the pole body 7 on the layered structure remains relatively stable.

[0084] Moreover, the first mounting platform 72 is formed by riveting, and the material of the riveted mounting platform has higher density, higher structural strength, and stronger connection reliability.

[0085] Optionally, the pole post body 7 is further provided with a riveting hole 71 on one end face forming the first mounting platform 72. The riveting hole 71 is used for positioning the riveting fixture, which can improve the riveting effect. The rivet formed by the pole post body 7 can fix the overall layer structure of the cover plate assembly 100. Of course, the riveting hole 71 can also be omitted during riveting, and the positioning effect can be achieved by using other parts.

[0086] Further optional, such as Figure 4 As shown, the first mounting bracket 72 is welded to the first material part 24. The mounting bracket and the composite connector 2 are connected by laser welding to form the third welding part 23. Here, the first material part 24 is located on the side of the second material part 26 away from the light cover plate 40. Welding the first mounting bracket 72 to the first material part 24 makes it easy to find the welding position and ensures the reliability of the connection.

[0087] In some embodiments, such as Figure 5As shown, the conductive terminal 1 is provided with a recessed groove 15 surrounding the first through hole 13. The recessed groove 15 can avoid the connection position between the conductive terminal 1 and the composite connector 2, and prevent the deformation caused by the connection position from affecting the surface flatness of the conductive terminal 1.

[0088] Specifically, the recessed groove 15 is located on at least one side of the conductive terminal 1. The recessed groove 15 can be located on the side of the conductive terminal 1 facing the light cover plate 40, preventing bulges from forming on that side. The recessed groove 15 can also be located on the side of the conductive terminal 1 away from the light cover plate 40, preventing bulges from forming at this location when the conductive terminal 1 is connected to an external circuit structure. Figure 5 In the example shown, the conductive terminal 1 has a recessed groove 15 surrounding the first through hole 13 on each side.

[0089] Taking the connection of conductive terminal 1 and composite connector 2 by welding as an example, weld seams and slag will be generated after welding, affecting the surface flatness of conductive terminal 1. To avoid this problem, a welding relief groove 15 is provided on conductive terminal 1. Using the relief groove 15 is a preferred solution. The welding relief groove 15 can be circular (e.g., Figure 1 and Figure 2 (as shown), square, racetrack-shaped (such as) Figure 7 Various shapes (as shown) can be eliminated if welding is not performed or if a clearance is provided on the opponent's assembly.

[0090] In some embodiments, such as Figure 5 As shown, the first through hole 13 includes an outer hole section 131 and an inner hole section 132 arranged sequentially along the axial direction. Here, the outer hole section 131 is located on the side of the inner hole section 132 away from the cover plate 40.

[0091] Specifically, the diameter of the outer hole section 131 is larger than the diameter of the inner hole section 132, and an annular platform 133 is formed between the outer hole section 131 and the inner hole section 132. The composite connector 2 is connected to the annular platform 133. That is to say, the portion of the first through hole 13 farther away from the light cover plate 40 is larger, and the portion closer to the light cover plate 40 is smaller. This facilitates the layer connection assembly of the pole body 7 and the light cover plate 40, etc., by using the annular platform 133 to support the load and improve the tightness of the layer connection.

[0092] Among them, the composite connector 2 can fit tightly against the annular platform 133 to ensure accurate positioning, prevent the composite connector 2 from axially shifting when subjected to impact force, and reduce damage to the composite connector 2.

[0093] In some specific embodiments, such as Figure 4As shown, the composite connector 2 is partially located in the outer hole section 131 and partially located in the inner hole section 132. The outer peripheral surface of the composite connector 2 is provided with a second recess 27 that fits on the annular platform 133. This results in a large contact area between the composite connector 2 and the conductive terminal 1, leading to high connection reliability. Furthermore, the connection area between the composite connector 2 and the electrode body 7 is also relatively large, making the composite connector 2 more securely clamped between the electrode body 7 and the conductive terminal 1.

[0094] Specifically, such as Figure 4 As shown, the second welding part 22 is formed at the inner hole section 132, so that the second material part 26 can be spliced ​​and welded to the conductive terminal 1.

[0095] In some other embodiments, the composite connector 2 is completely located within the outer bore section 131, meaning the end face of the composite connector 2 is in contact with the annular platform 133. In this case, the inner bore section 132 mates with the electrode body 7, and the seam between the conductive terminal 1 and the composite connector 2 is not exposed on the side facing the light cover plate 40. This design results in a smaller axial dimension for the composite connector 2, saving more material.

[0096] At this time, as Figure 9 As shown, on the side of the conductive terminal 1 facing the light cover plate 40, the conductive terminal 1 and the first material part 24 can be connected by through soldering.

[0097] In some specific embodiments, the diameter of the first through hole 13 remains unchanged, and there is no annular platform 133 inside the first through hole 13, or in other words... Figure 11 As shown, the inner circumferential surface of the first through hole 13 is spliced ​​with the outer circumferential surface of the composite connector 2, and the two are of equal diameter. The composite connector 2 is spliced ​​and welded to the conductive terminal 1.

[0098] In some embodiments, the terminal structure 10 further includes a cell connector 8, which is connected to the end of the terminal body 7 away from the conductive terminal 1. Connecting the internal cell tabs of the battery using the cell connector 8 provides a larger connection area and improves the reliability of the connection with the cell.

[0099] In some specific embodiments, such as Figure 10 As shown, the cell connector 8 and the terminal body 7 are integrated into one piece, which reduces the number of parts and lowers the cost.

[0100] Alternatively, the cell connector 8 and the electrode body 7 can be made of the same material, and the two can be connected by stamping or upsetting.

[0101] In other specific embodiments, such as Figure 3 and Figure 4 As shown, the cell connector 8 and the terminal body 7 are connected by welding. Separate processing followed by welding minimizes interference during assembly and reduces assembly difficulty.

[0102] Specifically, the electrode body 7 and the cell connector 8 are connected by laser welding to form the fourth welded part 74.

[0103] Specifically, the shape of the pole body 7 can be cylindrical, or it can be elliptical, racetrack-shaped, or other shapes.

[0104] In some embodiments, the pole body 7 is a single unit. In other embodiments, such as... Figure 2 and Figure 3 As shown, there are at least two electrode bodies 7. That is, there can be two or more electrode bodies 7. The connection of multiple electrode bodies 7 can improve the reliability of current conduction inside and outside the battery, as well as the reliability of the connection between the electrode bodies 7 and the 100-layer structure of the cover plate assembly.

[0105] Specifically, the conductive terminal 1 is provided with at least two corresponding first through holes 13, and each pole body 7 is provided with a composite connector 2. That is to say, when there are multiple pole bodies 7, the conductive terminal 1 is still a single conductive terminal, which facilitates the connection of the conductive terminal 1 to the external circuit structure.

[0106] Specifically, the pole structure 10 of this application can be either a positive pole or a negative pole.

[0107] The following is for reference. Figures 1-11 Description of cover plate assembly 100 according to an embodiment of the present utility model.

[0108] According to an embodiment of the present utility model, the cover plate assembly 100, such as Figures 1-3 As shown, the assembly includes: a cover plate 40, an electrode assembly, and a seal 60. The cover plate 40 has a front side 41 and a back side 42 facing away from each other, and a second through hole 43. A portion of the electrode body 7 passes through and fits into the second through hole 43, with the conductive terminal 1 located on the front side 41. The seal 60 is disposed between the electrode body 7 and the cover plate 40. The structure of the electrode assembly has been described in the above embodiments and will not be repeated here.

[0109] The cover plate assembly 100 of this application solves the problem of easy breakage of the electrode posts when they are made of composite materials in traditional solutions by setting this electrode post assembly. The electrode post structure 10 has stable connection and excellent conductivity, thus improving the reliability of the battery.

[0110] By moving the material composite position from the electrode post to the composite connector 2, the composite connector 2 is also prevented from contacting the electrolyte, thus reducing losses and improving reliability.

[0111] Specifically, the light cover plate 40 is the structural base of the cover plate assembly 100, used to isolate the internal and external structures of the battery. The four edges of the light cover plate 40 are connected and sealed to the battery casing.

[0112] Optionally, the cover plate 40 may be provided with an electrode (positive and negative) structure, a liquid injection structure, an explosion-proof valve structure, etc. The above structures may be provided on one cover plate 40 or separately on two cover plates 40.

[0113] Specifically, the cover plate assembly 100 further includes: a first insulating member 30 and a second insulating member 50, which are disposed on opposite sides of the optical cover plate 40 to achieve insulation between the pole post structure 10 and the optical cover plate 40. For example, in Figure 4 In the illustrated embodiment, the first insulating member 30 is located between the conductive terminal 1 and the light cover plate 40, and the second insulating member 50 is located between the cell connectors 8 of the light cover plate 40. A portion of the first insulating member 30 extends into the second through hole 43 and surrounds the electrode body 7.

[0114] Specifically, the first insulating component 30 is placed between the conductive terminal 1 and the light cover plate 40, and plays the roles of insulation, pressure bearing, and limiting. It is generally an injection molded part, and mostly made of polyphenylene sulfide (PPS) material.

[0115] Specifically, the second insulating component 50 is placed between the light cover plate 40 and the battery cell connector 8, and plays the roles of insulation, pressure bearing, and limiting. It is generally an injection molded part, mostly made of polypropylene (PP) material.

[0116] Specifically, the sealing element 60 is placed between the light cover plate 40 and the pole body 7, and plays the roles of insulation and sealing. It is generally a sealing ring, mostly made of fluororubber (FKM) or ethylene propylene diene monomer (EPDM) materials, or sealant can also be used.

[0117] Specifically, the electrode body 7 connects the internal and external conductive structures of the battery. The conductive terminal 1, composite connector 2, first insulating component 30, light cover plate 40, second insulating component 50, sealing component 60, and cell connector 8 are assembled and fixed together by riveting and welding. The cell connector 8 is made of the same copper material.

[0118] Specifically, the cell connector 8 connects the terminal body 7 and the cell electrode inside the battery, and uses the same copper material as the cell electrode.

[0119] Optionally, such as Figure 2 As shown, the cover plate assembly 100 also includes an explosion-proof valve protective film 91 and a rupture disc 92 disposed on the light cover plate 40.

[0120] The battery cell according to an embodiment of the present invention includes: a casing, a battery cell, and a cover plate assembly 100 as described in the above embodiment. The casing has an opening, the battery cell is located inside the casing, and the cover plate assembly 100 fits into the opening. A conductive terminal 1 is located on the side of the cover plate 40 away from the battery cell, and the terminal body 7 is electrically connected to the battery cell. By setting this terminal assembly, the battery cell of this application solves the problem of easy breakage of the terminal when the terminal is made of composite material in conventional solutions. The terminal structure 10 has a stable connection and excellent conductivity, improving the reliability of the battery.

[0121] The battery pack according to an embodiment of the present invention includes the battery assembly of the above-described embodiment of the present invention.

[0122] The battery pack in this embodiment, by employing an improved battery assembly, facilitates higher stability and reliability.

[0123] The electrical equipment according to the embodiments of the present invention includes the battery pack according to the above embodiments of the present invention.

[0124] It should be noted that the electrical equipment referred to here includes, but is not limited to, new energy vehicles, power tools, ships, and spacecraft. New energy vehicles can be pure electric vehicles, range-extended electric vehicles, etc. Specifically, a battery pack is installed within the vehicle. Here, the battery pack can be used to power the vehicle; for example, the battery pack can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller is used to control the battery pack to supply power to the motor, for example, for the vehicle's starting, navigation, and operating power needs. In some embodiments of this application, the battery pack can not only serve as the vehicle's operating power source but also as the vehicle's drive power source, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0125] By adopting an improved battery pack, the stability and reliability of electrical equipment can be enhanced.

[0126] In this specification, the terms "embodiment," "example," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0127] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A pole structure, characterized by, include: A conductive terminal for connection to the external circuitry of the battery, the conductive terminal having a first through hole; The electrode body, a portion of which is inserted and fitted into the first through hole; A composite connector, at least a portion of which is located within the first through hole, the composite connector comprising a first material portion and a second material portion connected together, the first material portion being connected to the pole body and being made of the same material, and the second material portion being connected to the conductive terminal and being made of the same material.

2. The pole structure of claim 1, wherein Both the first material section and the second material section are annular and spliced ​​along the axial direction of the pole body, and the connection surface between the first material section and the second material section is a metallurgical bonding surface.

3. The pole structure of claim 1, wherein An external welding assembly is formed between the conductive terminal and the electrode body, and the external welding assembly includes at least one of a first welding part, a second welding part, and a third welding part; The first welding part is located between the conductive terminal and the second material part, the second welding part is located between the conductive terminal and the first material part, and the third welding part is located between the pole body and the first material part.

4. The pole structure of claim 1, wherein The outer periphery of the pole body is provided with a first mounting platform, which is located inside the first through hole. The composite connector is sleeved on the pole body, and a first groove is provided on the inner circumferential surface of the composite connector, with the first mounting platform located in the first groove.

5. The pole structure of claim 4, wherein, The first mounting platform is a riveted mounting platform formed by riveting and is welded to the first material part.

6. The pole structure of claim 1, wherein The conductive terminal is provided with a recessed groove surrounding the first through hole, and the recessed groove is located on at least one side of the conductive terminal.

7. The pole structure of claim 1, wherein The first through hole includes an outer hole section and an inner hole section arranged sequentially along the axial direction. The diameter of the outer hole section is larger than the diameter of the inner hole section. An annular platform is formed between the outer hole section and the inner hole section. The composite connector is connected to the annular platform.

8. The pole structure of claim 7, wherein, The composite connector is partially located in the outer hole section and partially located in the inner hole section, and the outer peripheral surface of the composite connector is provided with a second recessed groove that fits on the annular platform. Alternatively, the composite connector may be located entirely within the outer bore section.

9. The pole structure according to any one of claims 1-8, characterized in that, Also includes: A cell connector is connected to the end of the electrode body that is away from the conductive terminal.

10. The pole structure of claim 9, wherein, The cell connector and the electrode body are integral parts, or the cell connector and the electrode body are connected by welding.

11. The pole structure according to any one of claims 1-8, wherein, The electrode body comprises at least two electrodes, and the conductive terminal is provided with at least two corresponding first through holes. Each electrode body is provided with one of the composite connectors.

12. A cover plate assembly characterized by, include: A light cover plate, wherein the light cover plate has a front side and a back side facing away from each other, and the light cover plate has a second through hole; According to any one of claims 1-11, in the electrode post structure, a portion of the electrode post body is fitted into the second through hole, and the conductive terminal is located on the front side of the plate; A sealing element is disposed between the pole body and the light cover plate.

13. A battery cell, characterized by include: A housing having an opening; The battery cell is located inside the housing; The cover plate assembly of claim 12, fitted at the opening, the electrically conductive terminal located on a side of the light cover plate distal from the electric cell, the pole body in electrical connection with the electric cell.

14. A battery pack, characterized by A battery cell comprising the cover plate assembly of claim 13.

15. An electrical device, characterized by A battery cell comprising the cover plate assembly of claim 13 or a battery pack comprising the cover plate assembly of claim 14.

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