CCS assembly, battery pack and energy storage system

Abstract

The invention provides a CCS assembly, a battery pack and an energy storage system. The CCS assembly comprises a first insulating layer, at least one group of wires, a second insulating layer and a plurality of welding parts. The first insulating layer and the second insulating layer are stacked, and the wire is arranged between the first insulating layer and the second insulating layer. The first insulating layer is used for being arranged towards single batteries of the battery pack and is provided with a plurality of first openings; the plurality of welding parts are all connected with the wire, and each welding part is exposed out of one first opening and is used for being connected with a pole of the single battery. The CCS assembly is simple in structure, the processing technology of the CCS assembly can be reduced, and the processing cost of the CCS is reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, and particularly to a CCS component, a battery pack, and an energy storage system. Background Art

[0002] A battery pack usually uses a cells contact system (CCS) component to collect information such as voltage and temperature to monitor the safety status of the battery. The CCS component mainly consists of a flexible printed circuit (FPC), an insulating material layer, and a bus bar. Among them, the FPC mainly consists of a conductive substrate and a cover film, etc. Due to connection reliability issues, the FPC and the bus bar need to be connected through nickel sheets. One end of the nickel sheet is fixedly connected to the FPC by soldering, and the other end is connected to the bus bar by laser welding. Then, the FPC is laminated with the insulating material layer to form the CCS component. Therefore, the existing CCS component uses the FPC for interconnection and conduction, and the overall architecture involves complex processing procedures and high costs. Summary of the Invention

[0003] This application provides a CCS component, a battery pack, and an energy storage system to simplify the structure of the CCS component, reduce the processing technology of the CCS component, and lower the processing cost of the CCS.

[0004] In a first aspect, this application provides a CCS component for series and / or parallel connection of different single cells, including a first insulating layer, at least one group of wires, a second insulating layer, and a plurality of welding parts. The first insulating layer and the second insulating layer are stacked, and the at least one group of wires is disposed between the first insulating layer and the second insulating layer. The first insulating layer is provided with a plurality of first openings. Each of the plurality of welding parts is connected to the wire, and each welding part exposes through one of the first openings for connecting to the pole of a single cell.

[0005] The CCS component of this application directly encapsulates the wire by using the stacked first insulating layer and second insulating layer, and sets a first opening in the first insulating layer, so that the welding part connected to the wire and used to connect to the pole of the single cell exposes through the first opening to be welded to the pole of the single cell, realizing the series-parallel connection between different single cells. The CCS component of this application abandons the traditional connection structure of FPC, insulating material, and bus bar, provides a new architecture of the CCS component, omits the preparation process of the FPC, simplifies the assembly process of the CCS component at the same time, and reduces the production cost.

[0006] Among them, in the CCS component of the present application, the first insulating layer is arranged towards the single battery inside the battery pack. The first insulating layer mainly functions as sealing, insulation, fire prevention, and discharge. The second insulating layer can play the roles of sealing, insulation, and support. Therefore, the hardness of the second insulating layer can be greater than that of the first insulating layer. The higher hardness of the second insulating layer can support the entire CCS component. The melting point or softening point of the first insulating layer is relatively high, which can effectively improve the safety of the CCS component. In addition, the first insulating layer also needs to have good acid and alkali corrosion resistance to prevent the CCS component from being corroded during use and avoid short circuits between the wire and the single battery.

[0007] In an alternative implementation, the CCS component further includes a conductive connection piece, and each conductive connection piece includes at least two connected welding parts. The conductive connection piece and the wire can be formed by processing the same metal foil or can be formed by welding a split structure.

[0008] In an alternative embodiment, the conductive connection piece can be an aluminum bar. Each conductive connection piece can include at least two welding parts, such as three welding parts, four welding parts or more, which can be specifically determined according to the number of single batteries that need to be connected in parallel for conductive connection and the operating parameters of the battery pack. The welding parts are used to weld with the pole posts of the single batteries in the battery pack. A bent connecting part is provided between adjacent welding parts. During the operation of the battery pack, the single battery will expand. If the conductive connection piece directly abuts against the single battery, when the single battery expands, it will drive the conductive connection piece to move, causing it to separate from the wire. Therefore, the bent connecting part is used to provide a deformation space for the expansion of the single battery to prevent the conductive connection piece from disconnecting from the wire due to the expansion force of the single battery, resulting in connection failure. Since the connecting part is not involved in welding with the single battery, in one implementation, the connecting part can be arranged between the wire routing area of the first insulating layer and the wire routing area of the second insulating layer to achieve insulation protection for the connecting part.

[0009] Among them, the wire in the CCS component of the present application can include a wire body and a plurality of connection terminals. The welding parts in the CCS component can be connected to the wire body of the wire through the connection terminals.

[0010] In one embodiment, the wire is further provided with a plurality of connection terminals. One end of each connection terminal is connected to the wire body, and the other end is connected to one of the conductive connection pieces. Among them, one end of each connection terminal connected to the conductive connection piece is arranged at one of the first openings, which is convenient for welding with the conductive connection piece. The conductive connection piece can be welded to the connection terminal of the wire, such as by soldering or laser welding. The present application does not limit the specific welding method between the two.

[0011] Among them, the connection terminal and the circuit body can be an integral structure or a split structure. When the connection terminal and the circuit body are of an integral structure, they are made of the same material, which can be prepared from copper or aluminum. The wire formed by the connection terminal and the circuit body is a metal foil with a specific circuit connection relationship. When the connection terminal and the circuit body are of a split structure, the connection terminal and the circuit body can be prepared from different materials, and the connection terminal can be a nickel sheet. The connection terminal and the circuit body can be connected by welding, such as soldering. Among them, in order to simplify the process and the structure of the CCS, in one embodiment, the connection terminal and the circuit body are of an integral structure. The wire formed by connecting the connection terminal and the circuit body can be formed by machining or etching through the same metal foil.

[0012] In an alternative implementation, the first insulating layer is provided with a wire routing area and an opening area. The opening area is located on two opposite side portions of the wire routing area, and the plurality of first openings are provided in the opening area. The circuit body is provided in the wire routing area.

[0013] Among them, the second insulating layer can be provided with openings or not. For the convenience of positioning and installation and the assembly of the CCS components, in an alternative implementation, the second insulating layer is provided with a plurality of second openings. Similarly, the second insulating layer can also be divided into a wire routing area and an opening area. The opening area is located on two opposite side portions of the wire routing area. The opening area is provided with a plurality of second openings, and the plurality of second openings and the plurality of first openings are arranged in one-to-one correspondence.

[0014] Since multiple battery packs can be provided in the battery pack. Therefore, for the convenience of realizing integral encapsulation and integral assembly, in an alternative implementation, there are a plurality of wire routing areas provided in the wire routing area of the first insulating layer, and the plurality of wire routing areas are arranged at intervals; there are a plurality of wire routing areas provided in the wire routing area of the second insulating layer, and the plurality of wire routing areas of the second insulating layer and the plurality of wire routing areas of the first insulating layer are arranged in one-to-one correspondence. A set of wires is provided between each wire routing area of the first insulating layer and each wire routing area of the second insulating layer. Each set of wires can be arranged corresponding to a set of battery packs in the battery pack, so that the CCS component can simultaneously realize the connection of multiple battery packs.

[0015] To realize the connection between the wire and the external circuit, the wire needs to be provided with positive and negative connection terminals. In an alternative implementation, the circuit body includes a positive terminal and a negative terminal, and the positive terminal and the negative terminal are used for connecting to the external circuit. For the convenience of connection, the positive terminal and the negative terminal respectively extend beyond the edges of the first insulating layer and the second insulating layer.

[0016] To endow the CCS component with a certain degree of flexibility and avoid rigid contact between the CCS component and the single battery, at least one of the first insulating layer and the second insulating layer can be a flexible thin film. Encapsulating the circuit body with the flexible thin film can improve the deformation ability of the CCS component and prevent connection failure of the CCS component due to small deformation stress.

[0017] To achieve the flexible structure of the CCS component, in an alternative implementation, both the first insulating layer and the second insulating layer are flexible insulating films. In another alternative implementation, the first insulating layer is a flexible insulating film and the second insulating layer is a flexible insulating plate. When assembling the battery pack using the CCS component, the flexible insulating film can be arranged facing the battery pack.

[0018] Among them, each part of the CCS component needs to be fixedly connected to achieve an overall fixed connection structure. In an alternative implementation, the first insulating layer, the wire, and the second insulating layer are fixed by pressing or riveting.

[0019] In one implementation, there are multiple wire routing areas provided in the first insulating layer, and the multiple wire routing areas are spaced apart; there are multiple wire routing areas provided in the second insulating layer, and the multiple wire routing areas of the second insulating layer are arranged in one-to-one correspondence with the multiple wire routing areas of the first insulating layer. Among them, a set of wires can be arranged between each wire routing area of the first insulating layer and each wire routing area of the second insulating layer. Thus, multiple sets of wires can be encapsulated using two insulating layers.

[0020] In a second aspect, the present application provides a manufacturing method of a CCS component, and the manufacturing method includes: placing a wire between a first insulating layer and a second insulating layer for fixation, and exposing the welding part connected to the conduction to a first opening of the first insulating layer to obtain the battery connection system component.

[0021] In an alternative implementation, the placing a wire between a first insulating layer and a second insulating layer for fixation, and exposing the welding part connected to the conduction to a first opening of the first insulating layer includes: pressing a metal foil on the surface of the first insulating layer provided with the first opening, forming a wire with a circuit body and multiple connection terminals through machining or etching, welding the connection terminals and the conduction connection piece, with the welding part of the conduction connection piece exposed to the first opening, and then covering the wire and the conduction connection piece with the second insulating layer, and fixing the first insulating layer, the wire, the conduction connection piece, and the second insulating layer by pressing or riveting.

[0022] The CCS component obtained by using the manufacturing method of the implementation mode of the present application can achieve the same effects as the CCS component in the first aspect of the present application, which will not be repeated here. In addition, during the manufacturing process of the CCS component of the present application, the fixation of the first insulating layer, the circuit body of the wire, and the second insulating layer can be completed first, and then the welding of the conductive connecting piece and the connecting terminal can be achieved, thereby obtaining the CCS component. In this manufacturing method, only the production of the wire, the fixation of the first insulating layer, the wire, and the second insulating layer, and the connection of the connecting terminal and the conductive connecting piece need to be completed to finish the production of the CCS component. This manufacturing process has simple process steps and is convenient for manufacturing.

[0023] In another alternative implementation mode, the step of placing the wire between the first insulating layer and the second insulating layer for fixation and exposing the welding part for conductive connection through the first opening in the first insulating layer includes:

[0024] Pressing a metal foil on the surface of the first insulating layer provided with the first opening, and forming a circuit body and a plurality of connecting terminals through machining or etching, with each connecting terminal exposed through one of the first openings;

[0025] Placing the conductive connecting pieces so that each conductive connecting piece corresponds to at least one connecting terminal, covering the second insulating layer provided with a second opening, and fixing the first insulating layer and the second insulating layer through pressing or riveting;

[0026] After welding the conductive connecting piece and the connecting terminal, the fixation of the first insulating layer, the wire, the conductive connecting piece, and the second insulating layer is completed.

[0027] The CCS component obtained by using the manufacturing method of the implementation mode of the present application can achieve the same effects as the CCS component in the first aspect of the present application, which will not be repeated here. In addition, during the manufacturing process of the CCS component of the present application, the welding of the conductive connecting piece and the connecting terminal can be completed first, and then the fixation of the first insulating layer, the wire, and the second insulating layer can be achieved, thereby obtaining the CCS component. In this manufacturing method, only the production of the wire, the connection of the connecting terminal and the conductive connecting piece, and the fixation of the first insulating layer, the wire, and the second insulating layer need to be completed to finish the production of the CCS component. This manufacturing process has simple process steps and is convenient for manufacturing.

[0028] It can be seen that the CCS component of the present application is an integrated minimalist CCS component. During the manufacturing process, after laminating the metal foil with the first insulating layer, graphic processing is carried out, and then the second insulating layer is laminated as a whole. The conductive connection piece can be obtained by connecting to the connection terminal of the etched wire through laser welding. Compared with the conventional CCS component, the SMT process can be eliminated, the use of the insulating coating material of the FPC can be saved, and in an optional implementation manner, the use of nickel sheets can also be saved, so as to achieve the purpose of low-cost minimization of the CCS component.

[0029] In a third aspect, the present application provides a battery pack, which includes a plurality of single cells and the CCS component of the present application. Each of the single cells is provided with a pole column. The CCS component is arranged on one side of the plurality of single cells where the pole columns are provided, and the first insulating layer faces the single cells. Each of the pole columns is welded to one of the welding parts in the battery connection system component, and the plurality of single cells are connected in series and / or in parallel through the conductive connection pieces in the CCS component.

[0030] In a fourth aspect, the present application provides an electrical device, which includes an electrical unit and the battery pack of the present application. The battery pack is used to provide power for the electrical unit.

[0031] The electrical device can be, for example, a vehicle.

[0032] In a fifth aspect, the present application provides an energy storage system, which includes a power converter and at least one battery pack of the present application; the power converter is used to perform power conversion on the voltage output by the battery pack and output it to the power grid or a load, and / or perform power conversion on the voltage output by an external power source and output it to the battery pack.

[0033] The technical effects that can be achieved in the above second to fifth aspects can be referred to the corresponding effect descriptions in the above first aspect, and will not be repeated here. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of a battery pack of an embodiment;

[0035] Figure 2 It is a schematic structural diagram of a CCS component of an embodiment;

[0036] Figure 3 It is an exploded structural diagram of a CCS component of an embodiment;

[0037] Figure 4 It is a schematic manufacturing process diagram of a CCS component of an embodiment of the present application;

[0038] Figure 5Schematic diagram of the manufacturing process of the CCS component according to an embodiment of the present application;

[0039] Figure 6 Schematic diagram of the connection structure of an energy storage system.

[0040] Reference numerals:

[0041] 01 - battery pack; 10 - housing; 20 - battery pack; 30 - CCS component; 3 - metal foil;

[0042] 31 - first insulating layer; 311, 331 - wiring area; 313, 333 - opening area; 312 - first opening; 32 - wire; 321 - wire body; 322 - connection terminal; 33 - second insulating layer; 332 - second opening; 34 - conductive connection piece; 341 - welding part; 342 - connection part. Detailed implementation manners

[0043] In order to make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings.

[0044] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and claims of the present application, the singular forms "a", "an", "the above", "the", and "this" are also intended to include, for example, the expression "one or more", unless clearly indicated to the contrary in the context.

[0045] References to "one embodiment" or "some embodiments" or the like described in this specification mean that specific features, structures, or characteristics described in connection with that embodiment are included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having", and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0046] Electric vehicles and energy storage systems generally include energy storage devices. Energy storage devices generally include one or more battery packs. In an electric vehicle, after the battery pack stores electric energy, it can be connected to the power system as a power source to provide power for the power system. In an energy storage system, the battery pack can be used to store electric energy and deliver the electric energy in the battery pack to the electrical components when needed.

[0047] Figure 1It is a schematic structural diagram of a battery pack. As Figure 1 shown, the battery pack 01 includes a housing 10, a battery pack 20, and a CCS component 30. The battery pack 20 and the CCS component 30 are encapsulated in the housing 10. Among them, the number of battery packs 20 can be one group, two groups, or multiple groups. Any battery pack 20 can include a plurality of single cells arranged side by side, and the arrangement direction of the plurality of single cells is the thickness direction of the single cell. The plurality of single cells can be connected in series and parallel through the CCS component 30 to achieve high voltage and large current output. At the same time, the CCS component 30 can also collect information such as voltage and temperature to monitor the battery safety status.

[0048] Figure 2 It is a schematic structural diagram of a CCS component according to an embodiment. Figure 3 It is an exploded structural diagram of a CCS component according to an embodiment. As Figure 2 and Figure 3 shown, the CCS component 30 of the embodiment of the present application includes a first insulating layer 31, at least one group of wires 32, a second insulating layer, and a plurality of conductive connection pieces 34. Among them, the first insulating layer 31 and the second insulating layer 33 are used to sandwich and fix the wires 32, and the conductive connection pieces 34 are connected to the wires 32. Among them, the conductive connection pieces 34 are used to connect to the electrode posts of different single cells, so as to realize the series and parallel connection of the plurality of single cells by using the wires 32 and the conductive connection pieces 34. The structures and connection relationships of the first insulating layer 31, the wires 32, the second insulating layer 33, and the conductive connection pieces 34 will be explained below.

[0049] Referring to Figure 2 and Figure 3 , the first insulating layer 31 can be a flexible insulating film or a flexible insulating board. The flexible insulating film can be, for example, an epoxy resin film, a polyimide resin film, a polyamide resin film, etc. The above flexible insulating films are only for illustrative purposes, and no specific material selection is limited herein. Among them, the first insulating layer 31 is provided with a wire routing area 311 and an opening area 313. Among them, the wire routing area 311 can be a long strip area, and its length direction can be along the arrangement direction of the single cells in each battery module in the battery pack. The number of wire routing areas 311 can be multiple, and the multiple wire routing areas are arranged at intervals. The number of wire routing areas can be determined according to the number of battery modules in the battery pack. Open areas 313 can be provided on both sides of each wire routing area 311. The open areas 313 on both sides of each wire routing area 311 respectively correspond to the electrode posts on one side of a group of battery modules. A plurality of first openings 312 are opened in each open area 313. Among them, the number of first openings 312 in each open area 313 can be determined according to the number of corresponding single cells in the battery pack. Among them, each first opening 312 in the open area 313 can be arranged corresponding to the electrode post of a single cell.

[0050] Similarly, the second insulating layer 33 can be a flexible insulating film or a flexible insulating plate. The flexible insulating film can be, for example, an epoxy resin film, a polyimide resin film, a polyamide resin film, etc. The above flexible insulating films are only for illustrative purposes, and no specific material selection is limited herein. Among them, the second insulating layer 33 is provided with a wiring area 331 and an opening area 333. Among them, the wiring area 331 can be a long strip area, and its length direction can be along the arrangement direction of the single cells in each battery module in the battery pack. The number of wiring areas 331 can be multiple, and the multiple wiring areas 331 are arranged at intervals. The number of wiring areas 331 can be determined according to the number of battery modules in the battery pack. An opening area 333 can be provided on both sides of each wiring area 331. The opening areas 333 on both sides of each wiring area 331 respectively correspond to one side of the pole column area in a group of battery modules. A plurality of second openings 332 are formed in each opening area 333. Among them, the number of second openings 332 in each opening area 333 can be determined according to the number of corresponding single cells in the battery pack. Among them, each second opening 332 in the opening area 333 can be arranged corresponding to the pole column of a single cell.

[0051] Of course, in addition to being made of flexible insulating films and flexible insulating plates, the first insulating layer 31 and the second insulating layer 33 can also be made of non-flexible insulating plates. After the first insulating layer 31 and the second insulating layer 33 are stacked, the wiring area 311 of the first insulating layer 31 and the wiring area 331 of the second insulating layer 33 are arranged corresponding to each other, the opening area 313 of the first insulating layer 31 and the opening area 333 of the second insulating layer 33 are arranged corresponding to each other, and the plurality of first openings 312 and the plurality of second openings 332 are arranged corresponding to each other one by one.

[0052] Among them, the flexible insulating films and flexible insulating plates used to form the first insulating layer 31 and the second insulating layer 33 need to have good bonding strength and good insulating properties.

[0053] To endow the CCS component 30 with a certain degree of flexibility and avoid rigid contact between the CCS component 30 and the single battery, at least one of the first insulating layer 31 and the second insulating layer 33 can be a flexible thin film. While endowing the CCS component 30 with a certain degree of flexibility, to endow the CCS component 30 with a certain supporting force, one of the first insulating layer 31 and the second insulating layer 33 is a flexible insulating film, and the other is a flexible insulating plate. In one embodiment, the first insulating layer 31 can be a flexible insulating film, and the second insulating layer 33 can be a flexible insulating plate. When the first insulating layer 31 is a flexible insulating film and the second insulating layer 33 is a flexible insulating plate, when using the battery pack composed of the CCS component 30, the first insulating layer 31 can be arranged facing the battery pack 20 to maintain a certain flexible contact between the battery pack 20 and the CCS component 30. Encapsulating the wire 32 with a flexible insulating film or a flexible insulator can improve the deformation ability of the CCS component 30 and prevent the connection failure of the CCS component 30 due to a small deformation stress.

[0054] Referring to Figure 3 , there is at least one group of wires 32, and each group of wires 32 can correspond to one group of battery packs 20. Therefore, the number of groups of wires 32 can be the same as the number of groups of battery packs 20. Each group of wires 32 can be made of materials such as copper or aluminum. One group of wires 32 can be arranged between each wire routing area 311 of the first insulating layer 31 and each wire routing area 331 of the second insulating layer 33.

[0055] Among them, each group of wires 32 is provided with a wire body 321 and a plurality of connection terminals 322 connected to the wire body 321. The connection terminal 322 and the wire body 321 can be an integral structure or a split structure. When the connection terminal 322 and the wire body 321 are an integral structure, the connection terminal 322 and the wire body 321 are made of the same material and can be prepared from copper or aluminum. The wire 32 formed by the connection terminal 322 and the wire body 321 is a metal foil with a specific circuit connection relationship. When the connection terminal 322 and the wire body 321 are a split structure, the connection terminal 322 and the wire body 321 can be prepared from different materials, and the connection terminal 322 can be a nickel sheet. The connection terminal 322 and the wire body 321 can be welded, such as soldering. Among them, to simplify the process and the structure of the CCS, in one implementation, the connection terminal 322 and the wire body 321 are an integral structure. And the wire 32 formed by connecting the connection terminal 322 and the wire body 321 can be formed by machining or etching the same metal foil.

[0056] Among them, the circuit main body 321 in each group of wire circuits may include multiple connection circuits. The multiple connection circuits may be respectively connected to different single cells to form different connection loops and then form different series-parallel connection loops. Each connection circuit may include a positive terminal and a negative terminal to achieve connection with an external circuit. Among them, in a group of wires 32, the positive terminals of all connection circuits may be gathered into one, and the negative terminals of all connection circuits may be gathered into one. For the convenience of connection, the positive terminal and the negative terminal are respectively arranged beyond the edges of the first insulating layer 31 and the second insulating layer 33.

[0057] The circuit main body 321 of each group of wires 32 is clamped and fixed between the wire routing area 311 of the first insulating layer 31 and the wire routing area 331 of the second insulating layer 33. Each connection terminal 322 is correspondingly arranged at a first opening 312 and also at a second opening 332. It can be understood that the number of connection terminals 322 may be less than the number of first openings 312 or second openings 332, that is, when arranging the connection terminals 322, each connection terminal 322 is exposed from the first opening 312 and the second opening 332, but not each first opening 312 and second opening 332 corresponds to a connection terminal 322. Each connection terminal 322 is exposed from the parts of the first opening 312 and the second opening 332 for connecting with the conductive connection piece 34.

[0058] Among them, there are multiple conductive connection pieces 34. The conductive connection piece 34 is the bus bar and can also be called the aluminum bar. Each conductive connection piece 34 may include at least two welding parts 341. The welding parts 341 are used for welding with the pole columns of the single cells. In one embodiment, the conductive connection piece 34 may include four welding parts 341. Inside the battery pack, each welding part 341 is welded to the positive pole column or the negative pole column of a single cell. Thus, multiple single cells can be connected in series through the same conductive connection piece 34. In the same conductive connection piece 34, a bent connection part 342 is provided between two adjacent welding parts 341. During the operation of the battery pack, the single cells will expand. If the conductive connection piece 34 directly abuts against the single cells, when the single cells expand, it will drive the conductive connection piece 34 to move, causing it to separate from the wire 32. Therefore, the bent connection part 342 is used to provide a deformation space for the expansion of the single cells to prevent the conductive connection piece 34 from disconnecting from the wire 32 due to the expansion force of the single cells, resulting in connection failure.

[0059] When the connection terminal 322 is connected to the conductive connection piece 34, each connection terminal 322 among the multiple connection terminals 322 is connected to one conductive connection piece 34 among the multiple conductive connection pieces 34, and each welding portion 341 in each conductive connection piece 34 is exposed from the first opening 312 and the second opening 332. Among them, the conductive connection piece 34 can be welded and connected to the connection terminal 322 of the wire 32, such as soldering or laser welding. The present application does not limit the specific welding method between the two.

[0060] Among them, the connection portion 342 can be arranged between the wiring area 311 of the first insulating layer 31 and the wiring area 331 of the second insulating layer 33 to achieve insulation protection for the connection portion 342. At the same time, it is convenient to form the CCS assembly 30 into an integrated structure and facilitate installation and replacement.

[0061] Each part of the CCS assembly 30 in the embodiment of the present application needs to be fixedly connected to achieve an overall fixed connection structure. When fixing the first insulating layer 31, the wire 32, the second insulating layer 33, and the conductive connection piece 34, a pressing or riveting method can be used for fixing. Among them, when the first insulating layer 31 and the second insulating layer 33 are flexible insulating films, a pressing method can be used for fixing. During the pressing process, the flexible insulating film can be softened to a certain extent, thereby playing a role in bonding the wire 32. When one of the first insulating layer 31 and the second insulating layer 33 is a flexible insulating board or a non-flexible insulating board, a riveting piece can be used to achieve riveting fixation.

[0062] The CCS assembly in the embodiment of the present application directly encapsulates the wire 32 by using the first insulating layer 31 and the second insulating layer 33, and respectively sets corresponding openings on the first insulating layer 31 and the second insulating layer 33, that is, the first opening 312 and the second opening 332, and arranges the connection terminal 322 of the wire 32 and the welding portion 341 of the conductive connection piece 34 at the first opening 312 and the second opening 332 to achieve the encapsulation of the wire 32 directly by using two insulating layers. When assembling the battery pack 01 by using the CCS assembly 30 of the present application, the exposed welding portion 341 can be used to connect with the pole column of the single battery in the battery pack, so as to realize the series and parallel connection of the single batteries through the wire 32 and the conductive connection piece 34. The CCS assembly 30 of the present application abandons the traditional connection structure of FPC, insulating material, and bus bar, provides a new architecture of the CCS assembly 30, omits the preparation process of FPC, simplifies the assembly process of the CCS assembly at the same time, and reduces the production cost.

[0063] The above explains the structure of the CCS assembly. The following will explain the manufacturing method of the CCS assembly with reference to the drawings.

[0064] An embodiment of the present application provides a method for manufacturing a CCS component. The manufacturing method includes: fixing a wire 32 between a first insulating layer 31 and a second insulating layer 33, and connection terminals 322 of the wire 32 are respectively exposed from a first opening 312 of the first insulating layer 31 and a second opening 332 of the second insulating layer 33; welding a welding portion 341 of a conductive connection piece 34 to the connection terminals 322 to obtain the CCS component.

[0065] Among them, fixing the wire 32 between the first insulating layer 31 and the second insulating layer 33 includes: laminating a metal foil on the surface of the first insulating layer 31 provided with the first opening 312, machining or etching to form the wire 32, and then covering the wire 32 with the second insulating layer 33 provided with the second opening 332, and fixing the insulating layer, the wire 32 and the second insulating layer 33 by laminating or riveting.

[0066] Exemplarily, Figure 4 is a schematic diagram of the manufacturing process of a CCS component according to an embodiment of the present application. As Figure 4 shown, the manufacturing method of a CCS component according to an embodiment of the present application includes the following steps:

[0067] S11. Provide an insulating film, and process a first opening 312 in the insulating film so that the insulating film has a first insulating layer 31 with an array structure of a plurality of first openings 312. The structure of the insulating film is as Figure 4 shown in Figure (a).

[0068] S12. As Figure 4 shown in Figure (b), provide a metal foil 3, and laminate the metal foil 3 and the insulating film. Among them, the metal foil 3 can be an aluminum foil or a copper foil. The thickness of the metal foil 3 can be customized according to requirements. After the insulating film and the metal foil 3 are adhered, they have good bonding force and insulation protection performance requirements.

[0069] S13. As Figure 4 shown in Figure (c), machine process or chemically etch the metal foil 3 to process a circuit to form a wire 32 having a circuit main body 321 and connection terminals 322.

[0070] S14. As Figure 4 shown in Figure (d), provide an insulating board, and use a machining method to process a second opening 332 in the insulating board. The processed second openings 332 are arranged in an array to form a second insulating layer 33. The number of the first openings 312 and the second openings 332 is the same.

[0071] Among them, the insulating board has good bonding performance with the metal foil and the insulating film and meets the protection requirements of long-term insulation performance.

[0072] S15. As shown in Figure 4 Figure (e), a conductive connection piece 34, i.e., an aluminum bar, is provided, and the insulating board, the aluminum bar, the wire 32 and the insulating film are fixed to form an integral body by pressing or riveting. Among them, the conductive connection piece 34 is exposed from the first opening 312.

[0073] S16. The connection terminal 322 of the aluminum bar and the wire 32 is welded by laser welding to form a CCS component.

[0074] In the manufacturing process of the CCS component in the above embodiments of the present application, the fixing of the first insulating layer, the wire and the second insulating layer can be completed first, and then the welding of the conductive connection piece and the connection terminal can be realized, thereby obtaining the CCS component. In this manufacturing method, only the manufacturing of the wire, the fixing of the first insulating layer, the wire and the second insulating layer, and the connection of the connection terminal and the conductive connection piece need to be completed to finish the manufacturing of the CCS component. This manufacturing process has simple process steps and is convenient for manufacturing.

[0075] In addition to the above method, the CCS component of the embodiment of the present application can also be manufactured by using other methods.

[0076] In another embodiment of the present application, the manufacturing method of the CCS component includes: arranging the wire on the surface of the first insulating layer, and the connection terminal of the wire is exposed from the first opening of the insulating layer; welding the welding part of the conductive connection piece with the connection terminal; covering the second insulating layer on the surface of the wire, the welding part of the conductive connection piece is exposed from the first opening, and fixing and connecting the second insulating layer with the first insulating layer to obtain the CCS component.

[0077] Among them, in an optional implementation manner, the arranging the wire on the surface of the first insulating layer includes: pressing a metal foil on the surface of the first insulating layer provided with the first opening, and forming the wire through machining or etching.

[0078] Exemplarily, Figure 5 is a schematic diagram of the manufacturing process of the CCS component of an embodiment of the present application. As shown in Figure 5 Figure, the manufacturing method of the CCS component of an embodiment of the present application includes the following steps:

[0079] S21. Provide an insulating film, and process a first opening 312 in the insulating film so that the insulating film has a first insulating layer 31 with an array structure of a plurality of first openings 312. The structure of the insulating film is as shown in Figure 5 Figure (a).

[0080] S22. As shown in Figure 5As shown in Figure (b), a metal foil 3 is provided, and the metal foil 3 and the insulating film are laminated. Among them, the metal foil 3 can be an aluminum foil or a copper foil. The thickness of the metal foil 3 can be customized according to requirements. After the insulating film is adhered to the metal foil 3, it has good bonding force and insulation protection performance requirements.

[0081] S23. As Figure 5 shown in Figure (c), the metal foil 3 is machined or chemically etched to process and fabricate a circuit to form a wire 32 having a circuit body 321 and a connection terminal 322.

[0082] S24. As Figure 5 shown in Figure (d), a conductive connection piece 34, that is, an aluminum bar, is provided, and the aluminum bar is welded to the connection terminal 322 of the wire 32 by laser welding;

[0083] S25. As Figure 5 shown in Figure (e), an insulating board is provided, and a second opening 332 is machined in the insulating board by machining. The machined second openings 332 are arranged in an array to form a second insulating layer 33. The number of the first openings 312 and the second openings 332 is the same.

[0084] Among them, the insulating board has good bonding performance with the metal foil and the insulating film and meets the protection requirements of long-term insulation performance.

[0085] S26. As Figure 5 shown in Figure (f), the insulating board, the aluminum bar, the wire 32 and the insulating film are fixed by lamination or riveting to form an integral body.

[0086] In the manufacturing process of the CCS component of the above embodiments of the present application, the welding of the conductive connection piece and the connection terminal can be completed first, and then the fixing of the first insulating layer, the wire and the second insulating layer can be realized, thereby obtaining the CCS component. In this manufacturing method, only the production of the wire, the connection of the connection terminal and the conductive connection piece, and the fixing of the first insulating layer, the wire and the second insulating layer need to be completed to complete the production of the CCS component. This manufacturing process has simple process steps and is convenient for manufacturing.

[0087] It can be seen that the CCS component of the present application is an integrated minimalist CCS component. In the manufacturing process, after the metal foil and the first insulating layer are laminated, graphic processing is performed, and then the second insulating layer is integrally laminated. The conductive connection piece is connected to the connection terminal of the etched wire by laser welding to obtain it. Compared with the conventional CCS component, the SMT process can be eliminated, the use of the insulating coating material of the FPC can be saved, and in the optional implementation mode, the use of nickel sheets can also be saved, so as to achieve the purpose of low-cost minimization of the CCS component.

[0088] For the same technical purpose, an embodiment of the present application provides a battery pack, which includes a plurality of single cells and the CCS component of the present application. The plurality of single cells are arranged in sequence, and each single cell is provided with a pole column. The CCS component is arranged on one side of the plurality of single cells where the pole columns are located. Each pole column is welded to one of the welding parts in the battery connection system component. The plurality of single cells are connected in series and / or in parallel through the conductive connection pieces in the CCS component.

[0089] For the same technical purpose, an embodiment of the present application provides an electrical device, which includes an electrical unit and the battery pack of the present application. The battery pack is used to provide power for the electrical unit. The electrical device can be, for example, an electric vehicle.

[0090] For the same technical purpose, an embodiment of the present application provides an energy storage system. Figure 6 It is a schematic diagram of the connection structure of an energy storage system. As Figure 6 shown, the energy storage system includes the battery pack of the present application and a power converter. The power converter is used to perform power conversion on the voltage output by the battery pack and then output it to the power grid or an external load, and / or the power converter is used to perform power conversion on the voltage output by an external power source and then output it to the battery pack. Among them, the battery pack can be connected to a photovoltaic module to charge the battery pack using the photovoltaic module.

[0091] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery connection system component, characterized in that, The battery connection system component is used for series and / or parallel connection of different single cells, and includes a first insulating layer, at least one set of wires, a second insulating layer, and a plurality of welding parts. The first insulating layer and the second insulating layer are stacked, and the at least one set of wires is disposed between the first insulating layer and the second insulating layer; The first insulating layer is provided with a plurality of first openings; All of the plurality of welding parts are connected to the wires, and each welding part is exposed through one of the first openings for connecting to the pole of the single cell.

2. The battery connection system component according to claim 1, characterized in that, The battery connection system component further includes a conductive connection piece, and each conductive connection piece includes at least two connected welding parts.

3. The battery connection system component according to claim 2, wherein, The wire includes a wire body and a plurality of connection terminals. One end of each connection terminal is connected to the wire body, and the other end is connected to one of the conductive connection pieces.

4. The battery connection system component according to claim 3, characterized in that, The connection terminal and the wire body are of an integral structure.

5. The battery connection system component according to claim 3, characterized in that, The connection terminal is a nickel sheet, and the connection terminal is welded to the conductive connection piece.

6. The battery connection system component according to any one of claims 1-5, characterized in that, The first insulating layer is provided with a wire routing area and an opening area. The opening area is located on two opposite side portions of the wire routing area. The plurality of first openings are provided in the opening area, and the wire body of the wire is disposed in the wire routing area.

7. The battery connection system component according to any one of claims 1-6, characterized in that, The second insulating layer is provided with a wire routing area and an opening area. The opening area is located on two opposite side portions of the wire routing area. The opening area is provided with a plurality of second openings, and the plurality of second openings and the plurality of first openings are arranged in one-to-one correspondence.

8. The battery connection system component according to claim 7, characterized in that There are a plurality of wire routing areas on the first insulating layer, and the plurality of wire routing areas are spaced apart; there are a plurality of wire routing areas on the second insulating layer, and the plurality of wire routing areas on the second insulating layer are arranged in one-to-one correspondence with the plurality of wire routing areas on the first insulating layer; one set of wires is disposed between each wire routing area of the first insulating layer and each wire routing area of the second insulating layer.

9. The battery connection system component according to any one of claims 1-8, characterized in that, The hardness of the second insulating layer is greater than that of the first insulating layer.

10. The battery connection system component according to any one of claims 1-9, characterized in that, The melting point or softening point of the first insulating layer is higher than that of the second insulating layer.

11. The battery connection system component according to any one of claims 1-10, characterized in that, The first insulating layer is a flexible insulating film, and the second insulating layer is a flexible insulating film or a flexible insulating board.

12. The battery connection system component according to any one of claims 1-11, characterized in that, The first insulating layer, the wire, and the second insulating layer are fixed by pressing or riveting.

13. A battery pack, characterized in that, It includes a plurality of single cells and the battery connection system component according to any one of claims 1-12. Each single cell is provided with a pole. The battery connection system component is disposed on one side of the plurality of single cells where the poles are located, and the first insulating layer faces the single cells. Each pole is welded to one of the welding parts in the battery connection system component, and the plurality of single cells are connected in series and / or in parallel through the conductive connection pieces in the battery connection system component.

14. An energy storage system, characterized in that, The energy storage system includes a power converter and at least one battery pack according to claim 13; the power converter is used for performing power conversion on the voltage output by the battery pack and outputting it to the power grid or a load, and / or, performing power conversion on the voltage output by an external power source and outputting it to the battery pack.

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