Cover plate assembly, battery pack, battery module, battery pack and electric device

Abstract

The application provides a cover plate assembly, a battery pack, a battery module, a battery pack and an electric device. The cover plate assembly is used for electrically connecting any adjacent battery monomer. The cover plate assembly comprises a cover plate with a first mounting hole, an insulating piece, an electric connection component and a sealing piece. The insulating piece is arranged in the first mounting hole, and the insulating piece has a second mounting hole penetrating in a first direction. The electric connection component is arranged in the second mounting hole, and in the first direction, the opposite ends of the electric connection component protrude from the second mounting hole. The electric connection component has a ring-shaped second mounting hole blocking part, and the blocking part is sealingly connected with the insulating piece. The cover plate, the insulating piece and the electric connection component form a mounting space. The sealing piece is arranged in the mounting space, and the sealing piece is sealingly connected with at least the insulating piece. The application can improve the sealing performance of the cover plate assembly, prevent the electrolyte from leaking out, and improve the safety performance of the battery module.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a cover plate assembly, battery pack, battery module, battery pack and electrical equipment. Background Technology

[0002] With the rapid development of the new energy industry, the demand for high energy density, high voltage, and low cost in battery packs is increasing. In battery module design, connecting multiple battery cells in series is a common way to achieve high voltage output.

[0003] In related technologies, a shared cover assembly is usually set between any two adjacent battery cells. The cover assembly typically includes a cover and an electrical connection component set in the cover. One end of the electrical connection component is electrically connected to one of the battery cells, and the other end of the electrical connection component is electrically connected to the other battery cell to realize the series connection of the two battery cells. An insulation setting between the electrical connection component and the cover is achieved by a sealing ring.

[0004] However, the current cover plate assembly has poor sealing performance, which may cause electrolyte leakage, thereby reducing the safety performance of the battery module. Utility Model Content

[0005] In view of the above problems, embodiments of this application provide a cover plate assembly, a battery pack, a battery module, a battery pack, and an electrical device, which can improve the sealing performance of the cover plate assembly, prevent electrolyte leakage, and improve the safety performance of the battery module.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a cover plate assembly for electrically connecting adjacent battery cells, the cover plate assembly comprising:

[0008] A cover plate having a first mounting hole that penetrates the cover plate along a first direction, the first direction being the thickness direction of the cover plate;

[0009] An insulating element is disposed within the first mounting hole, and the insulating element has a second mounting hole extending through the first direction;

[0010] An electrical connection component is disposed within a second mounting hole, and in the first direction, opposite ends of the electrical connection component protrude from the second mounting hole; the electrical connection component has a barrier portion surrounding the second mounting hole, and the barrier portion is also sealed to the insulating member; wherein, the cover plate, the insulating member, and the electrical connection component form an installation space;

[0011] A sealing element, wherein the sealing element is disposed within the mounting space and is at least in a sealing connection with the insulating element.

[0012] In one possible implementation, the barrier extends along the first direction.

[0013] In one possible implementation, the barrier portion includes a first barrier portion and a second barrier portion connected to each other, the first barrier portion and the second barrier portion having a preset included angle, and the second barrier portion being attached to and sealed to the insulating member.

[0014] In one possible implementation, the extension direction of the first blocking portion is inclined relative to the first direction; or, the first blocking portion extends along the first direction.

[0015] In one possible implementation, the electrical connection component includes a first terminal and a second terminal, which are interconnected and electrically conductive.

[0016] Both the first pole and the second pole have the blocking portion, and the two blocking portions are located on both sides of the insulating member along the first direction.

[0017] In one possible implementation, one of the first pole post and the second pole post has a protrusion and the other has a recess, with the protrusion embedded in the recess.

[0018] In one possible implementation, the first pole post includes a first protrusion that protrudes radially from the outer periphery of the first pole post and is located outside the second mounting hole;

[0019] One end of the blocking portion of the first pole post is connected to the first protrusion, and the other end of the blocking portion of the first pole post is sealed to the insulating component.

[0020] In one possible implementation, the first protrusion has a first groove that extends in a direction away from the second pole post.

[0021] In one possible implementation, the second pole post includes a second pole post body and a connector sleeved on the second pole post body; the blocking portion of the second pole post is formed by the connector.

[0022] In one possible implementation, the second pole body includes a first stepped surface, and the connector abuts against the first stepped surface and is sealed to the first stepped surface.

[0023] In one possible implementation, the connector has a second groove that exposes a portion of the outer peripheral surface of the second pole body.

[0024] In one possible implementation, the insulating element is made of any one of ceramic, ceramic matrix composite, and fiber-reinforced plastic, and the barrier portion is fixedly connected to the insulating element.

[0025] In one possible implementation, the seal includes a first sealing portion and a second sealing portion, the first sealing portion being sealed to the cover plate and the second sealing portion being sealed to the insulating element.

[0026] In one possible implementation, the mounting space includes a first mounting space and a second mounting space that are interconnected, the first mounting space exposing the outer peripheral surface of the insulator, and the second mounting space exposing a portion of the surface of the insulator in the first direction that is opposite to the first pole post.

[0027] In one possible implementation, the seal includes a first sealing ring, a second sealing ring, and a third sealing ring connecting the first sealing ring and the second sealing ring, wherein the first sealing ring and the second sealing ring are arranged along the first direction, and the second sealing ring is located on the side of the first sealing ring facing the electrical connection component.

[0028] The first sealing ring and the third sealing ring are disposed in the first installation space, and the first sealing ring is sealed to the cover plate by through welding, and the first sealing ring constitutes the first sealing part;

[0029] The second sealing ring is disposed in the second installation space and is sealed to the insulating component by brazing. The second sealing ring constitutes the second sealing part.

[0030] In one possible implementation, the third sealing ring further has a second protrusion that extends toward the insulating member and is sealed to the insulating member.

[0031] In one possible implementation, along the first direction, the insulating member includes a first surface and a second surface disposed opposite to each other, the second surface having a barrier groove that surrounds the connector and is located between the connector and the seal.

[0032] In one possible implementation, the barrier groove is an annular groove.

[0033] In one possible implementation, the cover plate assembly further includes a first lead-out and a second lead-out, the first lead-out being connected to the first pole post and the second lead-out being connected to the second pole post.

[0034] In one possible implementation, the cover plate assembly further includes a first spacer and a second spacer;

[0035] In the first direction, the first isolation member and the second isolation member are respectively disposed on both sides of the cover plate, and the first isolation member is arranged around the insulating member and the first pole post, and the second isolation member is arranged around the second pole post.

[0036] Secondly, embodiments of this application provide a battery pack, including the cover plate assembly described in the first aspect and a plurality of battery cells;

[0037] Any two adjacent battery cells are connected by the cover plate assembly, and the first terminal of the cover plate assembly is electrically connected to the tab of one of the battery cells, and the second terminal of the cover plate assembly is electrically connected to the tab of the other battery cell.

[0038] In one possible implementation, each of the battery cells includes a housing; along a first direction, the cover plate of the cover assembly includes a first end face and a second end face disposed opposite to each other;

[0039] At least one of the first end face and the second end face is provided with a second stepped surface, and the cover plate is inserted into the corresponding housing and is sealed to the housing through the second stepped surface.

[0040] Thirdly, embodiments of this application provide a battery module including the battery pack described in the second aspect.

[0041] Fourthly, embodiments of this application also provide a battery pack, including the battery module described in the third aspect.

[0042] Fifthly, embodiments of this application provide an electrical device, including an electrical appliance and a battery pack according to the fourth aspect, wherein the battery pack is electrically connected to the electrical appliance and is used to provide electrical energy to the electrical appliance.

[0043] In the cover plate assembly, battery pack, battery module, battery pack, and electrical equipment provided in this application embodiment, an insulating member with a second mounting hole is provided on the base of the cover plate. Then, a portion of the electrical connection component is disposed within the second mounting hole, and the electrical connection component has a blocking portion that surrounds the second mounting hole and is sealed to the insulating member. In this way, the blocking portion forms a physical barrier, effectively preventing electrolyte from seeping from the inside of the battery cell into the second mounting hole, avoiding electrolyte corrosion of the electrical connection component or causing a short circuit, and improving the yield of the battery module.

[0044] In addition, the cover plate, insulating parts and connectors construct an installation space and a sealing element is also provided. The sealing element is at least sealed to the insulating parts. In this way, it can complement the barrier part and further prevent the second mounting hole from seeping in from inside the battery cell.

[0045] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the cover plate assembly, battery pack, battery module, battery pack, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation methods. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 An exploded view of the cover plate assembly provided in the embodiments of this application;

[0048] Figure 2 Cross-sectional view of the cover plate assembly provided in the embodiments of this application. Figure 1 ;

[0049] Figure 3 Cross-sectional view of the cover plate assembly provided in the embodiments of this application. Figure 2 ;

[0050] Figure 4 A schematic diagram of an insulating element provided in an embodiment of this application;

[0051] Figure 5 A cross-sectional view of the insulating element provided in the embodiments of this application;

[0052] Figure 6 A schematic diagram of the sealing element provided in the embodiments of this application;

[0053] Figure 7 A schematic diagram of the battery pack provided in the embodiments of this application;

[0054] Figure 8 This is a schematic diagram of a battery module provided in an embodiment of this application.

[0055] Explanation of reference numerals in the attached figures:

[0056] 1: Battery module;

[0057] 10: Battery pack;

[0058] 100: Cover plate assembly;

[0059] 110: Cover plate; 111: First mounting hole;

[0060] 120: Insulator; 121: Second mounting hole; 122: First surface; 123: Second surface; 124: Barrier groove;

[0061] 130: Electrical connection components;

[0062] 131: First pole post; 1311: First protrusion; 1312: First groove;

[0063] 132: Second pole post; 1321: Second pole post body; 1322: Connector; 1323: First step surface; 1324: Second groove;

[0064] 133: Barrier section; 1331: First barrier section; 1332: Second barrier section;

[0065] 134: Brazing filler layer;

[0066] 140: Installation space; 141: First installation space; 142: Second installation space;

[0067] 150: Seal; 151: First sealing ring; 152: Second sealing ring; 153: Third sealing ring; 154: Second protrusion;

[0068] 160: First lead-out;

[0069] 170: Second lead-out;

[0070] 180: First isolation piece;

[0071] 190: Second isolation piece;

[0072] 200: Battery cell. Detailed Implementation

[0073] As described in the background section, the cover and electrical connection components are typically insulated by a sealing ring. However, during operation, electrolyte leakage may occur in individual battery cells. This leaked electrolyte may corrode the sealing ring, leading to further leakage of electrolyte to the electrical connection components, causing corrosion of the electrical connection components, and even short circuits between the electrical connection components and the cover, thus reducing the safety performance of the battery module.

[0074] To address the aforementioned technical problems, embodiments of this application provide a cover plate assembly, battery module, battery pack, and electrical device. By providing an insulating member with a second mounting hole on the base of the cover plate, and then partially placing an electrical connection component within the second mounting hole, the electrical connection component has a blocking portion that surrounds the second mounting hole and connects to the insulating member. This blocking portion forms a physical barrier, effectively preventing electrolyte from seeping into the second mounting hole from the battery cell, thus avoiding electrolyte corrosion of the electrical connection component or short circuits, and improving the yield of the battery module. Furthermore, a sealing member is provided within the mounting space constructed by the cover plate, insulating member, and connector. The sealing member is at least sealed to the insulating member, thus complementing the blocking portion and further preventing seepage from the battery cell into the second mounting hole.

[0075] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0076] Please refer to the attached document. Figure 1 To be continued Figure 6 This application provides a cover plate assembly 100 for connecting any adjacent battery cells 200 (see attached diagram). Figure 7 In other words, a cover assembly 100 is provided between any two adjacent battery cells 200. This cover assembly 100 is shared by the two battery cells 200. In this way, the two battery cells 200 can be connected in series through the cover assembly 100, thereby increasing the battery capacity and voltage of the battery pack 10. At the same time, it also reduces the space occupied by the cover assembly 100, thereby reducing the space occupied by the battery pack 10.

[0077] Please continue to refer to the appendix. Figure 1 The cover plate assembly 100 includes a cover plate 110. The cover plate 110 has a first mounting hole 111. The first mounting hole 111 extends through the cover plate 110 along a first direction, wherein the first direction is the thickness direction of the cover plate; the first direction can be an attachment... Figure 1 In the N direction. It should be understood that the first mounting hole 111 can have multiple options; for example, the first mounting hole 111 can be a circular hole.

[0078] Please refer to the attached document. Figure 2 Appendix Figure 4 and attached Figure 5The cover plate assembly 100 also includes an insulating member 120, which is disposed in the first mounting hole 111 and has a second mounting hole 121 that penetrates the insulating member 120 along a first direction.

[0079] It should be noted that the insulating member 120 may fill a portion of the first mounting hole 111, or other options may be available. For example, along the first direction, one end face of the insulating member 120 is located within the first mounting hole 111. That is, the thickness of the insulating member 120 in the first direction is less than the length of the first mounting hole 111. In other words, along the first direction, the insulating member 120 has a first surface 122 and a second surface 123 disposed opposite to each other, with the second surface 123 located within the first mounting hole 111.

[0080] Please refer to the attached document. Figure 2 and attached Figure 3 The cover plate assembly 100 also includes an electrical connection component 130, a portion of which is disposed within the second mounting hole 121. That is, in the first direction, the opposite ends of the electrical connection component 130 protrude from the second mounting hole 121, i.e., the electrical connection component 130 passes through the second mounting hole 121.

[0081] The electrical connection component 130 has a barrier portion 133 surrounding the second mounting hole 121. The barrier portion 133 is also sealed to the insulating member 120. The cover plate 110, the insulating member 120, and the electrical connection component 130 form a mounting space 140. It should be noted that the shape of the mounting space 140 can be regular or irregular, and this embodiment will not impose any further limitations.

[0082] The cover assembly 100 also includes a seal 150, which is disposed within the mounting space 140 and is at least sealingly connected to the insulating member 120. It should be noted that the sealing connection mentioned in this embodiment can be achieved through a welding process.

[0083] In this way, the barrier section forms a physical barrier, effectively preventing electrolyte from seeping into the second mounting hole from inside the battery cell, thus avoiding electrolyte corrosion of electrical connection components or causing short circuits and improving the yield of the battery module. Furthermore, the cover plate, insulating components, and connectors construct a mounting space with a sealing element, which is at least sealed to the insulating component. This complements the barrier section, further preventing electrolyte from seeping into the second mounting hole from inside the battery cell.

[0084] As one possible implementation of the barrier portion 133, the barrier portion 133 extends along a first direction, that is, the barrier portion 133 is perpendicular to the insulating member 120, which simplifies the preparation of the barrier portion 133.

[0085] As another possible implementation of the barrier portion 133, please continue to refer to the appendix. Figure 2 and attached Figure 3 The barrier portion 133 includes a first barrier portion 1331 and a second barrier portion 1332 that are connected to each other. The first barrier portion 1331 and the second barrier portion 1332 have a preset angle, wherein the preset angle is greater than 0. For example, the preset angle can be a right angle, an acute angle or an obtuse angle, so that the first barrier portion 1331 and the second barrier portion 1332 form an L-shaped or V-shaped structure.

[0086] The second barrier portion 1332 and the insulating member 120 are attached to each other and sealed together. This increases the contact area between the second barrier portion 1332 and the insulating member 120, thereby increasing the connection strength between the barrier portion 1332 and the insulating member 120.

[0087] In addition, the first barrier 1331 can form an axial barrier, and the second barrier 1332 can form a radial seal, thereby forming all-round protection and preventing electrolyte leakage into the second mounting hole 121 to the greatest extent.

[0088] The extension direction of the first blocking portion 1331 can be chosen in various ways. In some embodiments, the extension direction of the first blocking portion 1331 is inclined relative to the first direction. Its blocking surface forms a certain angle with the axial intrusion direction, which can more effectively disperse impact force or pressure and improve impact resistance and deformation resistance. In addition, the inclined design can better adapt to compact installation space, avoid interference with other components, and maintain sufficient blocking area.

[0089] In other embodiments, the first barrier portion 1331 extends along a first direction. The linearly extending first barrier portion 1331 has a simple structure, is easy to process and install, reduces production costs, and improves production efficiency.

[0090] In some embodiments, the electrical connection component 130 includes a first terminal 131 and a second terminal 132, which are interconnected and electrically conductive. The first terminal 131 and the second terminal 132 can be directly welded together, or they can be welded together using a solder layer 134 to achieve electrical conductivity. In some embodiments, the solder layer 134 is made of any one of pure nickel, nickel-phosphorus alloy, nickel-chromium alloy, pure silver, or silver-copper alloy.

[0091] In this embodiment, the ends of the first terminal 131 and the second terminal 132, which are opposite to each other, protrude from the second mounting hole 121. Specifically, the end of the first terminal 131 opposite to the second terminal 132 protrudes from the second mounting hole 121, and the end of the second terminal 132 opposite to the first terminal 131 protrudes from the second mounting hole 121. The first terminal 131 is used for electrical connection with the tab of one of the battery cells 200, and the second terminal 132 is used for electrical connection with the tab of another battery cell 200, thus enabling series connection of two adjacent battery cells 200. In this embodiment, the protruding ends of the first terminal 131 and the second terminal 132, which are opposite to each other, facilitate electrical connection between the first terminal 131 and the second terminal 132 and their corresponding tabs, improving the assembly of the battery pack 10. It should be noted that the connection between the terminal and the corresponding tab can be direct or indirect.

[0092] Both the first terminal post 131 and the second terminal post 132 are provided with barrier portions 133, which are located on both sides of the insulating member 120 along the first direction. The layout of the two barrier portions 133 protecting the critical area from both sides greatly enhances the barrier effect, effectively preventing electrolyte from seeping into the second mounting hole 121 from inside the battery cell 200, avoiding electrolyte corrosion of the electrical connection component 130 or causing a short circuit, and improving the safety performance of the battery module 1.

[0093] It should be noted that the connection surface of the first pole post 131 and the second pole post 132 can be a plane or a bent plane. For example, one of the first pole post 131 and the second pole post 132 has a protrusion and the other has a recess, with the protrusion embedded in the recess.

[0094] By inserting the protrusion into the recess, the contact area between the first pole piece 131 and the second pole piece 132 can be increased, thereby improving the connection strength between the first pole piece 131 and the second pole piece 132. In addition, the protrusion and the recess facilitate assembly and positioning when they are welded together.

[0095] It should also be noted that the barrier portion 133 and the corresponding first pole post 131 or second pole post 132 can be an integral part or separate parts. When the barrier portion 133 and the corresponding first pole post 131 or second pole post 132 can be an integral part, the barrier portion 133 can be formed simultaneously when the first pole post 131 and the second pole post 132 are formed, so as to improve the structural strength of the barrier portion 133 and the corresponding first pole post 131 or second pole post 132.

[0096] In one possible implementation, the first pole post 131 includes a first protrusion 1311 that protrudes radially from the outer periphery of the first pole post 131, such that the first pole post 131 has a T-shaped structure.

[0097] The first protrusion 1311 is located outside the second mounting hole 121. One end of the blocking portion 133 of the first pole post 131 is connected to the first protrusion 1311, and the other end of the blocking portion 133 of the first pole post 131 is sealed to the insulating member 120. In this way, the distance between the blocking portion 133 of the first pole post 131 and the first pole post 131 can be increased, thereby increasing the distance between the blocking portion 133 of the first pole post 131 and the second mounting hole 121. This prevents the second mounting hole 121 from deforming when fixing the blocking portion 133 and the insulating member 120, thus avoiding affecting the performance of the electrical connection component 130.

[0098] Please continue to refer to this. Figure 2 and Figure 3 The first protrusion 1311 has a first groove 1312, which extends in a direction away from the second pole post 132. Since the barrier portion 133 of the first pole post 131 and the insulating member 120 are welded together, both the first pole post 131 and the insulating member 120 undergo some expansion deformation during the welding process. This embodiment addresses this by providing a first groove 1312 on the first protrusion 1311. This allows for some space for air expansion during welding, facilitating the process, and also reduces the manufacturing cost of the first pole post 131.

[0099] In some embodiments, please continue to refer to the appendix. Figure 2 The second pole post 132 includes a second pole post body 1321 and a connector 1322 sleeved on the second pole post body 1321; the blocking part 133 of the second pole post 132 is formed by the connector 1322. This arrangement allows for independent selection of the material of the connector 1322, enabling the connector 1322 to cooperate with the second pole post body 1321, thereby improving the electrical insulation and leakage prevention capabilities of the entire cover plate assembly 100.

[0100] The second pole body 1321 includes a first stepped surface 1323, and the connector 1322 abuts against the first stepped surface 1323 and is sealed to the first stepped surface 1323. In this way, the first stepped surface 1323 can be used to provide mechanical support for the connector 1322, preventing the connector 1322 from shifting or deforming when subjected to external forces (such as vibration, impact or assembly pressure), and ensuring the accurate positioning of the blocking part 133.

[0101] It should be noted that, in this embodiment, the connector 1322 and the second pole body 1321 can be sealed together by welding.

[0102] Please continue to refer to this. Figure 2The connector 1322 has a second groove 1324 that exposes a portion of the outer peripheral surface of the second pole body 1321. Alternatively, the second groove 1324 extends away from the first pole 131, and the connector 1322 can be L-shaped.

[0103] Since the connector 1322 serves as the barrier part 133 of the second pole post 132, and the connector 1322 and the insulating part 120 are sealed by welding, the connector 1322 and the insulating part 120 undergo a certain degree of expansion and deformation during the welding process. In this embodiment, by providing a second groove 1324 on the connector 1322, some space can be left for air expansion during welding, which facilitates welding, and the manufacturing cost of the second pole post 132 can also be reduced.

[0104] It should also be noted that the connection method between the barrier part 133 and the insulating part 120 needs to be set according to the material of the insulating part 120.

[0105] In some embodiments, the insulating element 120 is made of any one of ceramic, ceramic matrix composite, and fiber-reinforced plastic, and the barrier portion 133 is welded to the insulating element 120. For example, when the insulating element 120 is made of ceramic, the barrier portion 133 can be brazed to the insulating element 120. For example, an active brazing filler metal can be coated on the surface of the insulating element 120 in the first direction, and then brazed to the barrier portion 133, achieving both a fixed connection and a seal. Another example is that the insulating element 120 is made of ceramic matrix composite (such as silicon carbide particle-reinforced aluminum matrix composite), and is connected to the barrier portion 133 by welding. Yet another example is that when the insulating element 120 is made of fiber-reinforced plastic, such as glass fiber reinforced plastic, it can be connected to the barrier portion 133 by adhesive bonding; or, for example, carbon fiber reinforced plastic, it can be connected to the barrier portion 133 by laser welding.

[0106] Please refer to the attached document. Figure 2 and attached Figure 3 In one possible implementation, the seal 150 has a first sealing portion and a second sealing portion, the first sealing portion being sealed to the cover plate 110 and the second sealing portion being sealed to the insulator 120.

[0107] It should be understood that the seal 150 and the cover plate 110 can be sealed by through welding, and the seal 150 and the insulator 120 can be sealed by brazing. This can seal the installation space 140 formed by the cover plate 110, the insulator 120 and the connector 1322, preventing the electrolyte of two adjacent battery cells from flowing into the installation space 140, thereby preventing the electrolyte from corroding the insulator 120 and the electrical connection component 130, and improving the safety of the battery module 1.

[0108] Please continue to refer to the appendix. Figure 2 The mounting space 140 includes a first mounting space 141 and a second mounting space 142 that are interconnected. The first mounting space 141 exposes the outer peripheral surface of the insulator 120, and the second mounting space 142 exposes a portion of the surface of the insulator 120 in the first direction that is opposite to the first pole post 131. In this way, the seal 150 can seal the outer peripheral surface and the portion of the surface in the first direction of the insulator 120, achieving bidirectional sealing coverage and improving the sealing reliability of the seal 150.

[0109] Please refer to the attached document. Figure 2 and attached Figure 6 In one possible implementation, the seal 150 includes a first sealing ring 151, a second sealing ring 152, and a third sealing ring 153 connecting the first sealing ring 151 and the second sealing ring 152.

[0110] The first sealing ring 151 and the second sealing ring 152 are arranged along the first direction, and the second sealing ring 152 is located on the side of the first sealing ring 151 facing the electrical connection component 130. That is, the second sealing ring 152 is offset from the first sealing ring 151 in the length direction of the cover plate 110, so that the seal 150 forms a Z-shaped structure.

[0111] The first sealing ring 151 and the third sealing ring 153 are disposed within the first mounting space 141, and the first sealing ring 151 is sealed to the cover plate 110 by through welding, forming a first sealing part; the second sealing ring 152 is disposed within the second mounting space 142 and is sealed to the insulating component 120 by brazing, forming a second sealing part. Thus, the first sealing ring 151 and the cover plate 110 have a large contact area, thereby improving the sealing strength between the sealing component 150 and the cover plate 110.

[0112] Furthermore, the third sealing ring 153 can be fitted to the insulating member 120, or it can be configured in other ways. For example, the third sealing ring 153 has a second protrusion 154 that extends toward the insulating member 120 and is sealed to it. This allows for flexible adjustment based on the shape of the insulating member 120 and the shape of the second mounting space 142, achieving point-to-point sealing through the extended protrusion and accommodating different assembly requirements.

[0113] Please continue to refer to the appendix. Figure 5In one possible implementation, along the first direction, the insulating member 120 includes a first surface 122 and a second surface 123 disposed opposite to each other. The second surface 123 is adjacent to the second terminal post 132. A barrier groove 124 is provided on the second surface 123, which surrounds the connector 1322 and is located between the connector 1322 and the seal 150. Since the connector 1322 and the insulating member 120 are soldered together, and the seal 150 is also soldered together with the insulating member 120 and the cover plate 110, the barrier groove 124 can prevent the solder layer from flowing together, interrupt the continuity of the solder layer on the surface of the insulating member 120, and thus prevent the cover plate 110 from being electrically connected to the connector 1322 (preventing the cover plate 110 from being electrically connected to the electrical connection component 130), thereby improving the safety of the battery module.

[0114] It should be understood that the shape of the barrier groove 124 can be chosen in various ways. In some embodiments, the barrier groove 124 can be an arc-shaped groove, and there can be multiple barrier grooves 124, which can be arranged at intervals along the circumference of the insulating member 120. In other embodiments, the barrier groove 124 is an annular groove, which can improve the function of the barrier groove 124 in blocking molten solder.

[0115] Please refer to the attached document. Figure 1 To be continued Figure 3 In one possible implementation, the cover plate assembly 100 further includes a first lead-out 160 and a second lead-out 170, the first lead-out 160 being connected to a first pole post 131 and the second lead-out 170 being connected to a second pole post 132.

[0116] In two adjacent battery cells 200, the first lead 160 is welded to the tab of one of the battery cells 200, and the second lead 170 is welded to the tab of the other battery cell 200. The arrangement of the first lead 160 and the second lead 170 facilitates welding with the corresponding tabs, and the lead provides a rigid carrier for the tabs. After welding, it can effectively suppress the deformation and breakage of the tabs caused by vibration or thermal expansion and contraction, and ensure the shape of the tabs after welding.

[0117] In one possible implementation, the cover plate assembly 100 further includes a first isolator 180 and a second isolator 190. In a first direction, the first isolator 180 and the second isolator 190 are respectively disposed on both sides of the cover plate 110. The first isolator 180 is circumferentially disposed around the insulating member 120 and the first terminal post 131, and the second isolator 190 is circumferentially disposed around the second terminal post 132. The arrangement of the first isolator 180 and the second isolator 190 can achieve insulation between the cover plate 110 and the electrical connection member 130.

[0118] Please refer to the attached document. Figure 7This application provides a battery pack 10, which includes a plurality of battery cells 200 and a cover assembly 100 as described in any of the above embodiments.

[0119] Any two adjacent battery cells 200 are connected by a cover assembly 100, and the first terminal 131 of the cover assembly 100 is electrically connected to the tab (not shown) of one of the battery cells 200, and the second terminal 132 of the cover assembly 100 is electrically connected to the tab of the other battery cell 200. This forms a battery pack 10 with high capacity and high voltage.

[0120] In the cover plate assembly 100, the first terminal 131 and the second terminal 132 can be welded together with nickel sheets to realize the conduction of the electrical connection component 130, thereby enabling the safe and effective series connection of multiple battery cells 200 and improving the capacity and voltage of the battery pack 10.

[0121] Please continue to refer to the appendix. Figure 7 Each battery cell 200 includes a housing; along the first direction, the cover plate 110 of the cover plate assembly 100 includes a first end face and a second end face disposed opposite to each other; at least one of the first end face and the second end face is provided with a second stepped surface, the cover plate is inserted into the corresponding housing and is sealed to the housing through the second stepped surface.

[0122] This allows the lead-out parts, separators, or other components of the cover assembly 100 to be located inside the housing. During the placement or transportation of the battery pack 10, these components will not be directly subjected to force, reducing the risk of breakage of the lead-out parts and electrical connection parts 130, and improving the yield and safety performance of the battery pack 10.

[0123] Please refer to the attached document. Figure 8 This application also provides a battery module 1, including a housing and a plurality of battery packs 10 as described in any of the above embodiments, wherein the plurality of battery packs 10 are arranged in an array within the housing.

[0124] Since the battery module 1 includes the battery pack 10 described in any of the above embodiments, it has all the beneficial effects of the battery pack 10, and will not be described in detail here.

[0125] This application also provides a battery pack, including the battery module described in any of the above embodiments, which has all the structure and beneficial effects of the battery module. This embodiment will not be described in detail here.

[0126] This application also provides an electrical device, including an electrical device and a battery pack as described in any of the above embodiments. The battery pack is connected to the electrical device and is used to provide electrical energy to the electrical device.

[0127] The electrical equipment in this embodiment can be a vehicle, such as a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle. Correspondingly, the electrical device can be the vehicle's drive mechanism or its control system. Furthermore, the electrical equipment can also be other energy storage devices, such as an energy storage power station.

[0128] Since the electrical device in this embodiment includes the battery pack described in any of the above embodiments, the structure and beneficial effects of the electrical device including the battery pack will not be described in detail here.

[0129] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0130] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0131] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A cover plate assembly (100) characterized by, The cover plate assembly (100) is used for electrically connecting adjacent battery cells (200), and the cover plate assembly (100) includes: A cover plate (110) having a first mounting hole (111) that penetrates the cover plate (110) along a first direction, the first direction being the thickness direction of the cover plate (110); An insulating member (120) is disposed in the first mounting hole (111) and the insulating member (120) has a second mounting hole (121) extending through the first direction; An electrical connection component (130) is disposed within the second mounting hole (121), and in the first direction, the opposite ends of the electrical connection component (130) protrude from the second mounting hole (121); the electrical connection component (130) has a barrier portion (133) surrounding the second mounting hole (121), and the barrier portion (133) is also sealed to the insulating member (120); wherein, the cover plate (110), the insulating member (120) and the electrical connection component (130) form a mounting space (140); A seal (150) is disposed within the mounting space (140) and is at least sealed to the insulating element (120).

2. The cover plate assembly (100) according to claim 1, characterized in that The barrier portion (133) extends along the first direction.

3. The cover plate assembly (100) according to claim 1, characterized in that The barrier portion (133) includes a first barrier portion (1331) and a second barrier portion (1332) connected to each other. The first barrier portion (1331) and the second barrier portion (1332) have a preset included angle, and the second barrier portion (1332) is attached to and sealed to the insulating member (120).

4. The cover plate assembly (100) according to claim 3, characterized in that The first blocking portion (1331) is inclined relative to the first direction in its extension direction; or, the first blocking portion (1331) extends along the first direction.

5. The cover plate assembly (100) according to any one of claims 1-4, characterized in that, The electrical connection component (130) includes a first terminal (131) and a second terminal (132), which are interconnected and electrically conductive; Both the first pole post (131) and the second pole post (132) have the blocking portion (133), and the two blocking portions (133) are located on both sides of the insulating member (120) along the first direction.

6. The cover plate assembly (100) according to claim 5, characterized in that One of the first pole post (131) and the second pole post (132) has a protrusion and the other has a recess, with the protrusion being embedded in the recess.

7. The cover plate assembly (100) according to claim 6, characterized in that The first pole post (131) includes a first protrusion (1311), which protrudes radially from the outer periphery of the first pole post (131) and is located outside the second mounting hole (121). One end of the blocking portion of the first pole post (131) is connected to the first protrusion (1311), and the other end of the blocking portion of the first pole post (131) is sealed to the insulating member (120).

8. The cover plate assembly (100) according to claim 7, characterized in that The first protrusion (1311) has a first groove (1312) that extends in a direction away from the second pole post (132).

9. The cover plate assembly (100) according to claim 8, characterized in that The second pole (132) includes a second pole body (1321) and a connector (1322) sleeved on the second pole body (1321); the blocking part (133) of the second pole (132) is formed by the connector (1322).

10. The cover plate assembly (100) according to claim 9, characterized in that The second pole body (1321) includes a first stepped surface (1323), and the connector (1322) abuts against the first stepped surface (1323) and is sealed to the first stepped surface (1323).

11. The cover plate assembly (100) according to claim 10, characterized in that The connector (1322) has a second groove (1324) that exposes a portion of the outer peripheral surface of the second pole body (1321).

12. The cover plate assembly (100) according to any one of claims 6-11, characterized in that The insulating component (120) is made of any one of ceramic, ceramic matrix composite material and fiber reinforced plastic, and the barrier part (133) is fixedly connected to the insulating component (120).

13. The cover plate assembly (100) according to claim 12, characterized in that The sealing element (150) includes a first sealing part and a second sealing part, the first sealing part being sealed to the cover plate (110) and the second sealing part being sealed to the insulating element (120).

14. The cover plate assembly (100) according to claim 13, characterized in that The mounting space (140) includes a first mounting space (141) and a second mounting space (142) that are interconnected. The first mounting space (141) exposes the outer peripheral surface of the insulator (120), and the second mounting space (142) exposes a portion of the surface of the insulator (120) in the first direction that is away from the first pole post (131).

15. The cover plate assembly (100) according to claim 14, characterized in that The sealing element (150) includes a first sealing ring (151), a second sealing ring (152), and a third sealing ring (153) connecting the first sealing ring (151) and the second sealing ring (152). The first sealing ring (151) and the second sealing ring (152) are arranged along the first direction, and the second sealing ring (152) is located on the side of the first sealing ring (151) facing the electrical connection component (130). The first sealing ring (151) and the third sealing ring (153) are disposed in the first installation space (141), and the first sealing ring (151) is sealed to the cover plate (110) by through welding, and the first sealing ring (151) constitutes the first sealing part. The second sealing ring (152) is disposed in the second mounting space (142) and is sealed to the insulating component (120) by brazing. The second sealing ring (152) constitutes the second sealing part.

16. The cover plate assembly (100) according to claim 15, characterized in that The third sealing ring (153) also has a second protrusion (154) that extends toward the insulating member (120) and is sealed to the insulating member (120).

17. The cover plate assembly (100) according to any one of claims 13-16, characterized in that Along the first direction, the insulating member (120) includes a first surface (122) and a second surface (123) disposed opposite to each other. A barrier groove (124) is provided on the second surface (123). The barrier groove (124) surrounds the connector (1322) and is located between the connector (1322) and the sealing member (150).

18. The cover plate assembly (100) according to claim 17, characterized in that The barrier groove (124) is an annular groove.

19. The cover plate assembly (100) according to any one of claims 6-11, characterized in that The cover plate assembly (100) further includes a first lead-out member (160) and a second lead-out member (170), wherein the first lead-out member (160) is connected to the first pole post (131) and the second lead-out member (170) is connected to the second pole post (132).

20. The cover plate assembly (100) according to any one of claims 6-11, characterized in that, The cover plate assembly (100) further includes a first spacer (180) and a second spacer (190); In the first direction, the first isolation member (180) and the second isolation member (190) are respectively disposed on both sides of the cover plate (110), and the first isolation member (180) is circumferentially disposed around the insulating member (120) and the first pole post (131), and the second isolation member (190) is circumferentially disposed around the second pole post (132).

21. A battery pack (10) characterized by, It includes the cover plate assembly (100) as described in any one of claims 1-20 and a plurality of battery cells (200); Any two adjacent battery cells (200) are connected by the cover plate assembly (100), and the first terminal (131) of the cover plate assembly (100) is electrically connected to the tab of one of the battery cells (200), and the second terminal (132) of the cover plate assembly (100) is electrically connected to the tab of the other battery cell (200).

22. The battery pack (10) according to claim 21, characterized by Each of the battery cells (200) includes a housing; along a first direction, the cover plate (110) of the cover plate assembly (100) includes a first end face and a second end face disposed opposite to each other; At least one of the first end face and the second end face is provided with a second stepped surface, and the cover plate (110) is inserted into the corresponding housing and is sealed to the housing through the second stepped surface.

23. A battery module (1) characterized in that It includes a housing and a plurality of battery packs (10) as described in claim 21 or claim 22, wherein the plurality of battery packs (10) are arranged in an array within the housing.

24. A battery pack, characterized by Includes the battery module as described in claim 23.

25. An electrical appliance, characterized in that, It includes an electrical device and a battery pack as described in claim 24, the battery pack being electrically connected to the electrical device for providing electrical energy to the electrical device.

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