WO2024026861A1 - 转接构件、电池单体、电池及用电装置 - Google Patents

转接构件、电池单体、电池及用电装置 Download PDF

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Publication number
WO2024026861A1
WO2024026861A1 PCT/CN2022/110665 CN2022110665W WO2024026861A1 WO 2024026861 A1 WO2024026861 A1 WO 2024026861A1 CN 2022110665 W CN2022110665 W CN 2022110665W WO 2024026861 A1 WO2024026861 A1 WO 2024026861A1
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WIPO (PCT)
Prior art keywords
sheet
adapter member
battery cell
battery
bent portion
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PCT/CN2022/110665
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English (en)
French (fr)
Inventor
苏华圣
邢承友
李全坤
徐春光
王鹏
金海族
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/110665 priority Critical patent/WO2024026861A1/zh
Publication of WO2024026861A1 publication Critical patent/WO2024026861A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs

Definitions

  • the present application relates to the field of battery technology, and in particular to an adapter component, a battery cell, a battery and an electrical device.
  • a battery includes a plurality of battery cells combined in series and/or parallel.
  • a battery cell is the smallest unit in a battery that provides an energy source. Its electrode terminals are generally electrically connected to the tabs of the cell assembly located in its housing through an adapter member, so that the electric energy of the battery cell can be output or input to the battery cell. electrical energy.
  • This application aims to solve at least one of the technical problems existing in the related art. To this end, one purpose of this application is to provide an adapter component, a battery cell, a battery and an electrical device.
  • An embodiment of the first aspect of the present application provides an adapter member for a battery cell.
  • the adapter member is in a folded and curved shape and includes a plurality of sheet portions and at least one bent portion connecting the plurality of sheet portions. , at least one of the bent portions is provided with a thinned area.
  • the adapter member in the embodiment of the present application is provided with a thinned area in at least one bending part.
  • the thinned area is smaller than the maximum thickness of other areas of the adapter member.
  • the plurality of sheet portions include a first sheet portion and a second sheet portion, at least one bending portion includes a first bending portion, the first sheet portion, the first bending portion, and the second bending portion.
  • the sheet-shaped parts are connected in sequence, wherein the first sheet-shaped part is used to connect to the electrode terminal of the battery cell, and the second sheet-shaped part is used to connect to the tab of the battery cell.
  • the shape of the adapter component can be flexibly designed according to actual needs.
  • the plurality of sheet portions include a first sheet portion, a second sheet portion, and a third sheet portion, at least one bent portion includes a first bent portion and a second bent portion, and the first The sheet-shaped part, the first bending part, the second sheet-shaped part, the second bending part and the third sheet-shaped part are connected in sequence, wherein the bending directions of the first bending part and the second bending part are opposite, and the bending directions of the first bending part and the second bending part are opposite.
  • the one piece-shaped part is used for connecting with the electrode terminal of the battery cell, and the third piece-shaped part is used for connecting with the pole lug of the battery cell.
  • the adapter component is generally bent in a Z-shape as a whole, which can better adapt to the internal space of the battery cell.
  • thinned areas are provided on both the first bending portion and the second bending portion. This makes it easier to bend the transfer component during processing, and the molding accuracy is higher.
  • the maximum thickness of the adapter member is T 1 and the thickness of each thinned area is T 2 , where T 1 /4 ⁇ T 2 ⁇ 0.6 mm, preferably, T 1 /3 ⁇ T 2 ⁇ 0.4 mm.
  • T 1 /4 ⁇ T 2 ⁇ 0.6 mm preferably, T 1 /3 ⁇ T 2 ⁇ 0.4 mm.
  • the maximum thickness of the adapter member is no less than 0.3 mm and no more than 2 mm. Design the thickness of the sheet part with reference to this range, which can meet the structural strength requirements and internal resistance design requirements.
  • the thickness of the thinned region is no less than 0.1 mm and no more than 0.6 mm.
  • the thickness of the thinned area is designed with reference to this range, so that the bending part can be easily bent and higher molding accuracy can be obtained.
  • the width of a bent portion is equal to the width of a corresponding thinned area thereon.
  • the width of the thinned area is designed to be as large as possible to make the bending part easier to bend.
  • the minimum gap size between two adjacent sheet-like parts is H
  • the width of the bent portion connecting two adjacent sheet-like parts is L, where 3.14 ⁇ H/2 ⁇ L ⁇ 3.14 ⁇ H.
  • the width of each bent portion is no less than 1 mm and no more than 10 mm. In this way, the bent part can be at an appropriate bending radius, making it easy to form.
  • each bent portion forms a thinned groove on one or both sides of the thinned area.
  • the thinning groove can be formed using appropriate processes according to actual needs.
  • the sidewalls of the thinned groove are tapered away from the center of the groove, thereby making machining easier.
  • one of the plurality of sheet-shaped portions is used for welding with the tab of the battery cell, and one of the sheet-shaped portions includes a main body area and a welding area, wherein the bent portion is connected to the main body. area, the thickness of the main area is T1, and the thickness of the thinned area is T2, where T1/4 ⁇ T2 ⁇ 0.6 mm. In this way, it can not only meet the structural strength required in the main body area, but also make the bending part easier to bend.
  • the welding zone has at least one welding groove raised away from an adjacent tab portion.
  • the design of the welding groove can not only improve the structural strength, but also increase the reliability of the welding contact between the adapter component and the tab, making the connection more reliable, thereby improving the performance and service life of the battery cell.
  • the embodiment of the second aspect of the present application provides a battery cell, including: a casing having an accommodation cavity; an end cover connected to the casing to close the accommodation cavity; and a battery core assembly disposed in the accommodation cavity and having tabs ;
  • the electrode terminal is provided on the end cover; and the adapter member of any of the aforementioned embodiments, wherein the adapter member connects the tab and the electrode terminal.
  • the battery cell assembly is a wound battery cell assembly
  • the battery cell includes a cylindrical casing and a positive terminal cover and a negative terminal cover, wherein the positive terminal cover is closed on one end of the casing, and the negative terminal cover is The extreme cover fits over the other end of the housing.
  • the above-mentioned adapter components of the battery cells are easy to form at the bends, and the bending positions are relatively accurate and the molding precision is high. Therefore, the performance and quality of the battery cells are improved.
  • An embodiment of the third aspect of the present application provides a battery including a plurality of battery cells of the aforementioned aspects combined in series and/or parallel. Based on the above design of the battery cell's adapter component, the battery can achieve corresponding technical effects, and its performance and quality can be improved accordingly.
  • An embodiment of the fourth aspect of the present application provides an electrical device, including the battery cell of the aforementioned aspect.
  • the battery performance and quality of the electrical device can be improved accordingly based on the aforementioned design of the adapter component in the battery cell.
  • Figure 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.
  • Figure 2A is a schematic diagram of the disassembled structure of a battery according to some embodiments of the present application.
  • Figure 2B is a schematic diagram of the disassembled structure of the battery according to some embodiments of the present application.
  • Figure 3A is a schematic diagram of the disassembled structure of a battery cell according to some embodiments of the present application.
  • Figure 3B is a schematic three-dimensional structural diagram of the positive terminal cover of a battery cell according to some embodiments of the present application.
  • Figure 3C is a schematic cross-sectional structural diagram cut along the A-A direction in Figure 3B;
  • Figure 4A is a schematic three-dimensional structural diagram of an adapter component according to some embodiments of the present application.
  • Figure 4B is a schematic cross-sectional structural diagram cut along the B-B direction in Figure 4A;
  • Figure 5A is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to some embodiments of the present application.
  • Figure 5B is a schematic cross-sectional structural diagram cut along the C-C direction in Figure 5A;
  • Figure 5C is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to other embodiments of the present application.
  • Figure 6 is a structural block diagram of an electrical device according to some embodiments of the present application.
  • 1000-vehicle 100-battery; 200-controller; 300-motor; 120-box; 10-battery cell;
  • 106b-negative electrode terminal 104-liquid injection hole; 105-pressure relief mechanism; 500-transfer member;
  • 500a-positive electrode adapter member 51-sheet part; 511-first sheet part; 512-second sheet part;
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • the electrode terminals of the battery cells are generally electrically connected to the tabs of the battery cell components through adapter members, so that the electric energy of the battery cells can be output or electric energy can be input to the battery cells.
  • the thickness of the sheet material of the adapter component is also designed to increase accordingly.
  • the adapter component needs to be designed in a bent shape. Due to the large thickness of the sheet material of the adapter component, the bending process is difficult and it is difficult to meet the molding accuracy requirements.
  • the inventor has conducted in-depth research and provided a transfer member, a battery cell, a battery and an electrical device.
  • the transfer member is easy to form at the bending point, and the bending position is relatively accurate, and the forming accuracy is high. , thereby improving the performance and quality of battery cells and batteries.
  • the battery cells disclosed in the embodiments of this application can be applied to power batteries or energy storage batteries.
  • the application scenarios of power batteries include but are not limited to vehicles, ships, aircraft, spacecraft, electric tools, electric toys, various mobile terminals, etc.
  • the application scenarios of energy storage batteries include but are not limited to solar power generation systems, hydroelectric power generation systems, wind power generation systems, etc.
  • a schematic structural diagram of a vehicle 1000 is provided for some embodiments of the present application.
  • the specific type of the vehicle 1000 is not limited, for example, it is a new energy electric vehicle, which includes a battery 100, a controller 200 and a motor 300.
  • the battery 100 can supply power to various electrical modules of the entire vehicle, such as the controller 200, the motor 300, the control system and the air conditioner (not shown in the figure).
  • the battery 100 includes a box 120 and a plurality of battery cells 10 located in the box 120 .
  • the box 120 provides an accommodation space for the battery cells 10.
  • the box 120 may include a first part 121 and a second part 122.
  • the first part 121 and the second part 122 cover each other, and the first part 121 and the second part 122 jointly define a receiving space.
  • multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the connection modes of the multiple battery cells 10 are both series and parallel.
  • a battery 100 provided by other embodiments of the present application includes a box 120 and a plurality of battery modules 1200 located in the box 120 .
  • the box 120 may include a first part 121 and a second part 122, and the first part 121 and the second part 122 jointly define a receiving space.
  • Each battery module 1200 includes a fixed case 1201 and a plurality of battery cells 10 located in the fixed case 1201 and combined in series, parallel or mixed connection.
  • the battery 100 may also include a bus component (not shown in the figure) for realizing electrical connection between multiple battery modules 1200 .
  • the battery cell 10 provided in some embodiments of the present application includes a housing 110 with a receiving cavity, an end cover (such as a positive terminal cover 102 and a negative terminal) connected to the housing 110. cover 103), a cell assembly 101 disposed in the casing 110 and having tabs (such as the negative tab 107 and the positive tab not shown in the figure due to perspective reasons), and electrode terminals (such as the positive electrode) arranged on the end cover.
  • the battery cell 10 typically also includes an electrolyte located in the case 110 (not shown in the figure).
  • the positive adapter member 500a can be connected (eg, welded or riveted) to the positive electrode terminal 106a and the positive electrode tab, and the negative electrode adapter member can be connected (eg, welded or riveted) to the negative electrode terminal 106b and the negative electrode tab 107 to form an electrode terminal. electrical connection with the corresponding tab.
  • the positive electrode terminal 106 a and the negative electrode terminal 106 b are used to connect with an external conductive structure to output electric energy from the battery cell 10 or input electric energy to the battery cell 10 .
  • the series connection, parallel connection or mixed connection of multiple battery cells 10 can be realized through the positive electrode terminal 106 a and the negative electrode terminal 106 b of the multiple battery cells 10 and external circuit design.
  • the battery core assembly 101 is a wound battery core assembly
  • the casing is cylindrical (such as cylindrical, square or flat cylindrical, etc.)
  • the positive terminal cover 102 is closed on one end of the housing 110
  • the negative terminal cover 103 is closed on the other end of the housing 110
  • the positive electrode terminal 106a is provided on the positive terminal cover 102 (as shown in Figure 3B)
  • the negative electrode terminal 106b Provided on the negative terminal cover 103 (as shown in FIG. 3A).
  • Protruding structures may be respectively provided on the positive terminal cover 102 and the negative terminal cover 103, and the positive electrode terminals 106a (for example, the two positive electrode terminals 106a in the figure) and the negative electrode terminals 106b (for example, the two negative electrode terminals 106b in the figure) are embedded respectively. in the corresponding convex structure.
  • the positive terminal cover 102 and/or the negative terminal cover 103 may be provided with an injection hole 104 for injecting electrolyte, and the positive terminal cover 102 and/or the negative terminal cover 103 may also be provided with a pressure relief mechanism 105, such as an explosion-proof valve. .
  • the cell assembly 101 is mainly formed by winding positive electrode pieces and negative electrode pieces (not shown in the figure), and a separator (not shown in the figure) is provided between the positive electrode piece and the negative electrode piece. ).
  • the portions of the positive electrode piece and the negative electrode piece that are provided with active material each serve as their main body, and the portions of the positive electrode piece and the negative electrode piece that are not provided with active material constitute the positive electrode tab and the negative electrode tab 107 respectively.
  • the positive electrode tab and the negative electrode tab 107 are located at both ends of the main body, and have been flattened respectively to form a flat shape.
  • the adapter member provided by the embodiment of the present application is used for battery cells (such as the battery cell 10 shown in Figure 3A).
  • the adapter member is in a folded and curved shape as a whole, including multiple sheet-like parts and connecting the multiple sheet-like parts. At least one bent portion, wherein at least one bent portion is provided with a thinned area.
  • the design of the adapter component makes it easier to bend during processing, the bending position is more accurate, and the molding precision is high, which can improve the performance and quality of the battery cells and batteries.
  • Figure 4A is a schematic three-dimensional structural view of the adapter member in some embodiments of the present application
  • Figure 4B is a schematic cross-sectional structural view cut along the B-B direction in Figure 4A
  • Figure 5A is a schematic three-dimensional structural diagram of the adapter member in a flattened state according to some embodiments of the present application
  • Figure 5B is a schematic cross-sectional structural diagram cut along the C-C direction in Figure 5A.
  • the adapter member 500 for a battery cell provided in the embodiment of the present application has a folded and curved shape as a whole, and includes a plurality of sheet portions 51 and at least one bent portion 52 connecting the plurality of sheet portions 51, wherein, At least one bent portion 52 is provided with a thinned area 520 .
  • the adapter member 500 may be machined from sheet metal.
  • the overall shape of the sheet portion 51 is substantially flat, and the bending portion 52 is bent relative to the sheet portion 51 , so that the entire adapter member 500 exhibits a folded and curved shape.
  • the adapter member 500 has a folded and curved shape as a whole, which can better adapt to the internal space of the battery cell.
  • the adapter member 500 is connected to the electrode terminals and the tabs of the cell assembly inside the battery cell respectively (for example, by welding or riveting), and can play a good conductive connection role.
  • the thinned area 520 of the bent portion 52 has undergone a thinning process, so that the thickness is smaller than the maximum thickness of other areas of the adapter member 500 .
  • the areas of each sheet portion 51 and the bent portion 52 other than the thinned area 520 can have a consistent thickness.
  • some of the sheet portions 51 may also be thinned in local areas.
  • thickness is defined as the thickness of a certain part or area of the plate material of the adapter member 500, rather than the thickness caused by its overall structural shape.
  • the adapter member 500 in the embodiment of the present application is provided with a thinned area 520 in at least one bending portion 52 , and the maximum thickness of the thinned area 520 is smaller than that of other areas of the adapter member 500 .
  • the adapter component 500 provided by the embodiment of the present application is easier to bend during processing, and the bending position is more accurate and the molding precision is higher, so it can improve the battery cell performance. performance and quality of the body and battery.
  • the thinning process of the thinned area 520 can be achieved by using at least one machining process such as forging, stamping, upsetting, and material removal. Thinning can be performed on any side surface of the thinned area 520 to obtain a desired thickness. It is also possible to perform thinning processing on one side of the thinning area 520 first, and then continue to perform thinning processing on the other side surface of the thinning area 520 to finally obtain the desired thickness.
  • the bent part 52 forms a thinning groove 53 in the thinning area 520.
  • the thinning groove 53 is formed. formed on one side of the thinned area 520 .
  • the design of the thinned groove 53 can make the thinned area 520 obtain a relatively small thickness, thereby making it easier to bend the adapter member 500 during processing, and the bending position is more accurate.
  • the thinned groove 53 may also be formed on the other side of the thinned area 520 .
  • thinning grooves 53 may also be formed on both sides of the thinning area 520 .
  • the thinning groove 53 can be flexibly designed according to process and design requirements.
  • the side walls of the thinned groove 43 are inclined away from the center of the groove, thereby forming a chamfer structure, making processing easier.
  • the width of the bent portion 52 is defined as the size of the relatively small narrow edge of the bent portion 52 when it is in a flattened state. That is to say, the width of the bent portion 52 is The width 52 is the size of the bent portion 52 in the length direction of the adapter member 500 when the adapter member 500 is in a flat state.
  • the width of the thinned area 520 is defined as the width of the bottom surface of the thinned groove 53 formed in the thinned area 520 when the adapter member 500 is in a flat state. As shown in FIG. 5B , the width of the bent portion 52 may be equal to the width of the corresponding thinned area 520 provided thereon. That is, the entire bent portion 52 is thinned to a thickness smaller than the maximum thickness of other portions of the adapter member 500 .
  • the width of the bent portion 52 can also be greater than the width of the corresponding thinned area 520 provided thereon, that is, only a partial area of the bent portion 52 is thinned, so that easy and flexible bending can still be achieved. The technical effect of more accurate bending position.
  • the folded and bent shape of the adapter member 500 is not limited, and it includes a plurality of sheet portions 51 and at least one bent portion 52 .
  • the plurality of sheet portions 51 include a first sheet portion 511 , a second sheet portion 512 and a third sheet portion 513 , and at least one bent portion 52 It includes a first bending part 521 and a second bending part 522, a first sheet part 511, a first bending part 521, a second sheet part 512, a second bending part 522 and a third sheet part 513 in sequence.
  • the electrode terminal connection can realize the electrical connection between the transfer member 500 and the electrode terminal.
  • the third sheet portion 513 is used to connect with the tab of the battery cell, and can realize the electrical connection between the transfer member 500 and the tab.
  • the transfer member 500 can be made of sheet materials with better electrical conductivity such as aluminum or copper.
  • the first bending part 521 and the second bending part 522 are both provided with thinned areas 520, so that the two bending parts of the adapter member 500 can be easily bent during processing, and the forming accuracy is improved. higher.
  • the plurality of sheet-shaped portions of the adapter member may further include a first sheet-shaped portion and a second sheet-shaped portion, and at least one bent portion of the adapter member includes a first bent portion, and the first sheet-shaped portion
  • the first sheet-shaped part, the first bent part and the second sheet-shaped part are connected in sequence, wherein the first sheet-shaped part is used to connect to the electrode terminal of the battery cell, and the second sheet-shaped part is used to connect to the tab of the battery cell.
  • the shape of the adapter component can be flexibly designed as needed.
  • the sheet portion 51 of the adapter member 500 for connecting to the electrode terminal has a through hole 56 for being assembled with the electrode terminal.
  • the electrode terminals are inserted into the through holes 56 and are welded and fixed to the first sheet portion 511 .
  • the edge of the first sheet portion 511 may have a positioning notch 57 .
  • the shape of the positioning notch 57 is not limited, and it can cooperate with the correspondingly designed positioning structure in the battery cell, thereby improving the installation accuracy of the adapter member 500 and reducing the difficulty of assembly.
  • the through holes 56 and the positioning notches 57 can be formed by a stamping process.
  • the sheet portion 51 of the adapter member 500 for connecting to the tab includes a body area 5130 and a welding area 5131 .
  • the main body area 5130 is integrally connected with the second bent portion 522, and the welding area 5131 is used for welding with the tab.
  • the welding area 5131 has at least one welding groove 55 that is raised away from the adjacent sheet portion 51 (ie, away from the second sheet portion 512).
  • the welding groove 55 bulges away from the adjacent sheet portion 51 , that is, it bulges toward the tab of the cell assembly after being assembled with the cell assembly.
  • the welding groove 55 may be formed by a stamping process.
  • the number and specific structural form of the welding grooves 55 are not limited, and can be in various appropriate shapes, such as V-shaped, cross-shaped, circular, strip-shaped, etc.
  • the third sheet portion 513 has two V-shaped and symmetrically arranged welding grooves 55 .
  • the design of the welding groove 55 can not only improve the structural strength, but also increase the reliability of the welding contact between the adapter member 500 and the tab, making the connection more reliable, thereby improving the performance and service life of the battery cell.
  • the third sheet portion 513 is designed with positioning holes 58 for positioning during welding, which can improve the accuracy of welding assembly.
  • the thickness of the welding area 5131 of the third sheet portion 513 can be designed to be smaller than the thickness of the main area 5130 thereof. Since the welding area 5131 is mainly used for welding with the tabs, designing its thickness to be thinner than the main area 5130 can reduce the welding stress, improve the strength of the welding connection with the tabs, and make the welding more reliable.
  • the specific shape, specifications and dimensions of the adapter member 500 should be designed accordingly in conjunction with the specific specifications and dimensions of the battery cells and related components.
  • the maximum thickness of the adapter member 500 is T 1 and the thickness of each thinned area 520 is T 2 , where T 1 /4 ⁇ T 2 ⁇ 0.6 mm, preferably, T 1 /3 ⁇ T 2 ⁇ 0.4 mm.
  • each sheet-like portion 51 may be T 1
  • the thickness of each thinned region 520 may be T 2 .
  • Designing an appropriate thickness for the thinned area 520 can take into account the internal resistance design requirements, structural strength requirements, ease of implementation and accuracy requirements of the molding process of the transfer member 500 .
  • the adapter member 500 is easier to bend, and higher molding accuracy can be obtained. It is also suitable for battery cells. Easier to fit into place.
  • the sheet portion 51 of the adapter member 500 for connecting to the tab includes a body area 5130 and a welding area 5131 , where , the thickness of the main body area 5130 is T 1 , and the thickness of the thinned area 520 of the bent portion 52 (the second bent portion 522 in the figure) connected to the main body area 5130 is T 2 , where T 1 /4 ⁇ T 2 ⁇ 0.6 mm.
  • T 1 the thickness of the thinned area 520 of the bent portion 52 (the second bent portion 522 in the figure) connected to the main body area 5130
  • T 1 /4 ⁇ T 2 ⁇ 0.6 mm the internal resistance design requirements, structural strength requirements, ease of implementation and accuracy requirements of the molding process of the adapter component 500 can be taken into consideration.
  • the maximum thickness T 1 of the adapter member 500 is no less than 0.3 mm and no more than 2 mm.
  • the thickness of the sheet portion 51 can be designed with reference to this range to meet structural strength requirements and internal resistance design requirements.
  • the maximum thickness T 1 of the adapter member 500 may be designed to be 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm.
  • the thickness T2 of the thinned region is no less than 0.1 mm and no more than 0.6 mm.
  • the thickness of the thinned area 520 can be designed with reference to this range, so that the bending portion 52 can be easily bent, thereby achieving higher molding accuracy.
  • the thickness T 2 of the thinned region 520 may be designed to be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm.
  • the width of the bent portion 52 is equal to the width of the corresponding thinned area 520 provided thereon. Designing the width of the thinned area 520 to be as large as possible can make the bending portion 52 easier to bend.
  • the minimum gap size between two adjacent sheet portions 51 is H
  • the width of the bent portion 52 connecting the two adjacent sheet portions 51 is L, where, 3.14 ⁇ H/2 ⁇ L ⁇ 3.14 ⁇ H.
  • H 1 represents the minimum gap size between the first sheet portion 511 and the second sheet portion 512
  • H 2 represents the second sheet portion 512 and the third sheet portion.
  • L 1 represents the width of the first bending portion 521 located between the first sheet portion 511 and the second sheet portion 512
  • L 2 represents the width of the first bent portion 521 located between the second sheet portion 512 and the third sheet portion. The width of the first bent portion 522 between portions 513 .
  • H 1 , H 2 , L 1 , and L 2 satisfy: 3.14 ⁇ H 1 /2 ⁇ L 1 ⁇ 3.14 ⁇ H 1 , 3.14 ⁇ H 2 /2 ⁇ L 2 ⁇ 3.14 ⁇ H 2 .
  • This embodiment allows the bent portion 52 to be at an appropriate bending radius, thereby making it easy to form and conducive to reducing the internal resistance of the adapter member.
  • Appropriate design of the gap size H and the width L of the bent portion 52 can make the bent portion 52 at an appropriate bending radius, thereby making it easy to form and conducive to reducing the internal resistance of the adapter member 500 .
  • the width of each bending portion 52 is no less than 1 mm and no more than 10 mm, which allows the bending portion 52 to be at an appropriate bending radius, thereby making it easy to form.
  • the width of the bent portion 52 may be designed to be 1 mm, 3 mm, 5 mm, 7 mm, or 10 mm according to different specifications of the adapter member 500 .
  • the width of the thinned area 520 may be the width of the bottom surface of the thinned groove 53
  • the thickness of the thinned area 520 is the thickness of the area corresponding to the bottom surface of the thinned groove 53 .
  • each bent portion 52 (eg, L 1 , L 2 ) may be the same or different, and is related to its corresponding minimum gap size (eg, H 1 , H 2 ).
  • the width of the bent portion 52 is equal to the width of the corresponding thinned area 520 thereon, that is, the width of the bottom surface of the thinned groove 53 , and the width of the bent portion 52 is not less than 1 mm and not less than 1 mm. It is larger than 10 mm, so that the bending part 52 is at an appropriate bending radius, which is easy to form and helps reduce the internal resistance of the adapter member 500 .
  • the adapter member 500 provided by some embodiments of the present application includes a first sheet portion 511, a first bent portion 521, a second sheet portion 512, and a second bent portion connected in sequence. part 522 and the third sheet part 513, where the first bending part 521 and the second bending part 522 have opposite bending directions.
  • the first sheet part 511 is used for welding with the electrode terminal of the battery cell, and the third The sheet portion 513 is used for welding with the tabs of the battery cells.
  • the first sheet portion 511 is provided with a through hole 56 for assembly with the electrode terminal, and has a positioning notch 57 on the edge.
  • the third sheet portion 513 includes a main body area 5130 and a welding area 5131, and is designed with positioning holes 58 for welding positioning.
  • the thickness of the welding area 5131 is smaller than the thickness of the main body area 5130, and has a bulge facing away from the second sheet portion 512. at least one welding groove 55.
  • the thickness of the main body region 5130 of the third sheet portion 513 is T1, and the thickness of the thinned region 520 is T2, where T1/4 ⁇ T2 ⁇ 0.6 mm.
  • the maximum thickness of the adapter member 500 is T 1 .
  • All areas of the first bent portion 521 and the second bent portion 522 are thinned, and the thickness of the thinned area 520 is T 2 .
  • the thickness design can be carried out with reference to the following range: T 1 /3 ⁇ T 2 ⁇ 0.4 mm.
  • the minimum gap size H 1 between the first sheet portion 511 and the second sheet portion 512 and the width L 1 of the first bent portion 521 satisfy: 3.14 ⁇ H 1 / 2 ⁇ L 1 ⁇ 3.14 ⁇ H 1 .
  • the minimum gap size H 2 between the second sheet portion 512 and the third sheet portion 513 and the width L 2 of the second bent portion 522 satisfy: 3.14 ⁇ H 2 /2 ⁇ L 2 ⁇ 3.14 ⁇ H 2 .
  • the adapter member 500 designed in the above embodiment of the present application is easy to form at the bending point, and the bending position is relatively accurate, and the forming precision is high, thereby improving the performance and quality of the battery.
  • an electrical device 2000 is also provided, including the battery 100 of any of the foregoing embodiments.
  • the battery 100 includes a plurality of battery cells 10 of the foregoing embodiments.
  • the electrical device 2000 can be any device that needs to use the battery 100 , and the performance and quality of the battery 100 can be improved accordingly based on the design of the adapter member 500 of the battery cell 10 .

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Abstract

提供一种转接构件、电池单体、电池及用电装置。转接构件用于电池单体，转接构件呈折叠弯曲形状，包括多个片状部分和将多个片状部分连接的至少一个折弯部分，至少一个折弯部分设有减薄区。

Description

转接构件、电池单体、电池及用电装置 技术领域
本申请涉及电池技术领域，尤其涉及一种转接构件、电池单体、电池及用电装置。
背景技术
在相关技术中，电池包括串联和/或并联方式组合的多个电池单体。电池单体是电池中提供能量来源的最小单元，其电极端子一般通过转接构件与位于其壳体内的电芯组件的极耳电连接，从而可以输出电池单体的电能或者向电池单体输入电能。
发明内容
本申请旨在至少解决相关技术中存在的技术问题之一。为此，本申请的一个目的在于提出一种转接构件、电池单体、电池及用电装置。
本申请第一方面的实施例提供了一种转接构件，用于电池单体，转接构件呈折叠弯曲形状，包括多个片状部分和将多个片状部分连接的至少一个折弯部分，其中至少一个折弯部分设有减薄区。
本申请实施例的转接构件在至少一个折弯部分设减薄区，该减薄区相比转接构件的其它区域的最大厚度较小，该设计使得转接构件在加工时更容易实现弯折，而且折弯位置更加准确，成型精度较高，因此可以提升电池单体和电池的性能和品质。
在一些实施例中，多个片状部分包括第一片状部分和第二片状部分，至少一个折弯部分包括第一折弯部分，第一片状部分、第一折弯部分和第二片状部分依次连接，其中，第一片状部分用于与电池单体的电极端子连接，第二片状部分用于与电池单体的极耳连接。转接构件的形状可以根据实际需要灵活设计。
在一些实施例中，多个片状部分包括第一片状部分、第二片状部分和第三片状部分，至少一个折弯部分包括第一折弯部分和第二折弯部分，第一片状部分、第一折弯部分、第二片状部分、第二折弯部分和第三片状部分依次连接，其中，第一折弯部分和第二折弯部分的折弯方向相反，第一片状部分用于与电池单体的电极端子连接，第三片状部分用于与电池单体的极耳连接。转接构件整体上大致呈现Z字形折弯，可以更好的适应电池单体的内部空间。
在一些实施例中，第一折弯部分和第二折弯部分上均设置有减薄区。使得转接构件在加工时更容易实现弯折，成型精度更高。
在一些实施例中，转接构件的最大厚度为T 1，各个减薄区的厚度为T 2，其中，T 1/4≤T 2≤0.6毫米，优选地，T 1/3≤T 2≤0.4毫米。这样，可以兼顾到转接构件的内阻设计需求、结构强度需求、成型工艺的易实施性和精度需求。当T 1/3≤T 2≤0.4毫米时，转接构件更容易实现弯折，可以获得更高的成型精度，在电池单体中也更容易装配到位。
在一些实施例中，转接构件的最大厚度不小于0.3毫米，且不大于2毫米。参考此范围对片状部分进行厚度设计，可以满足结构强度需求和内阻设计需求。
在一些实施例中，减薄区的厚度不小于0.1毫米，且不大于0.6毫米。参考此范围对减薄区进行厚度设计，使得折弯部分容易实现弯折，可以获得更高的成型精度。
在一些实施例中，一个折弯部分的宽度等于其上对应设置的减薄区的宽度。减薄区的宽度设计的尽量大，可以使折弯部分更容易实现弯折。
在一些实施例中，相邻两个片状部分之间的最小间隙尺寸为H，相邻两个片状部分相连接的折弯部分的宽度为L，其中，3.14×H/2≤L≤3.14×H。该实施例可以使折弯部分处于适当的折弯半径，从而易于成型，并有利于减小转接构件的内阻。
在一些实施例中，各个折弯部分的宽度不小于1毫米且不大于10毫米。这样，可以使折弯部分处于适当的折弯半径，从而易于成型。
在一些实施例中，每个折弯部分在减薄区的一侧或两侧形成减薄凹槽。可以根据实际需要、选用适当的工艺形成减薄凹槽。
在一些实施例中，减薄凹槽的侧壁向远离凹槽的中心倾斜，从而使得加工更容易进行。
在一些实施例中，多个片状部分中的其中一个片状部分用于与电池单体的极耳焊接，该其中一个片状部分包括主体区和焊接区，其中，弯折部分连接于主体区，主体区的厚度为T1，减薄区的厚度为T2，其中，T1/4≤T2≤0.6毫米。这样，不但可以满足主体区所需的结构强度，而且使得折弯部分更容易实现弯折。
在一些实施例中，焊接区具有背向相邻的片状部分***的至少一个焊接凹槽。焊接凹槽的设计不但可以提高结构强度，而且可以增加转接构件与极耳焊接接触的可靠性，使得连接更加可靠，从而可以改善电池单体的性能和使用寿命。
本申请第二方面的实施例提供了一种电池单体，包括：壳体，具有容纳腔；端盖，与壳体连接以封闭容纳腔；电芯组件，设置于容纳腔内且具有极耳；电极端子，设置于端盖；以及前述任一实施例的转接构件，其中，转接构件连接极耳和电极端子。
在一些实施例中，电芯组件为卷绕式电芯组件，电池单体包括呈筒状的壳体以及正极端盖和负极端盖，其中，正极端盖盖合于壳体的一端，负极端盖盖合于壳体的另一端。
以上电池单体的转接构件在折弯处容易成型，且折弯位置较为准确，成型精度较高，因此，电池单体的性能和品质得到提升。
本申请第三方面的实施例提供了一种电池，包括以串联和/或并联方式组合的多个前述方面的电池单体。基于电池单体的转接构件的上述设计，电池可以获得相应的技术效果，性能和品质可以得到相应提升。
本申请第四方面的实施例提供了一种用电装置，包括前述方面的电池单体。用电装置的电池性能和品质可以基于电池单体中转接构件的前述设计而获得相应提升。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
在附图中，除非另外规定，否则贯穿多个附图相同的附图标记表示相同或相似的部件或元素。这些附图不一定是按照比例绘制的。应该理解，这些附图仅描绘了根据本申请公开的一些实施方式，而不应将其视为是对本申请范围的限制。
图1为本申请一些实施例的车辆的结构示意图；
图2A为本申请一些实施例的电池的拆解结构示意图；
图2B为本申请一些实施例的电池的拆解结构示意图；
图3A为本申请一些实施例的电池单体的拆解结构示意图；
图3B为本申请一些实施例的电池单体的正极端盖的立体结构示意图；
图3C为图3B中沿A-A向剖切的截面结构示意图；
图4A为本申请一些实施例的转接构件的立体结构示意图；
图4B为图4A中沿B-B向剖切的截面结构示意图；
图5A为本申请一些实施例的转接构件处于展平状态的立体结构示意图；
图5B为图5A中沿C-C向剖切的截面结构示意图；
图5C为本申请另一些实施例的转接构件处于展平状态的立体结构示意图；以及
图6为本申请一些实施例的用电装置的结构框图。
附图标记说明：
1000-车辆；100-电池；200-控制器；300-马达；120-箱体；10-电池单体；
121-第一部分；122-第二部分；1200-电池模块；1201-固定壳；110-壳体；
102-正极端盖；103-负极端盖；107-负极极耳；101-电芯组件；106a-正极电极端子；
106b-负极电极端子；104-注液孔；105-泄压机构；500-转接构件；
500a-正极转接构件；51-片状部分；511-第一片状部分；512-第二片状部分；
513-第三片状部分；52-折弯部分；521-第一折弯部分；522-第二折弯部分；
520-减薄区；53-减薄凹槽；5130-主体区；5131-焊接区；55-焊接凹槽；56-穿孔；
57-定位缺口；58-定位孔58；2000-用电装置。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”、“相连”“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
电池单体的电极端子一般通过转接构件与电芯组件的极耳电连接，从而可以输出电池单体的电能或者向电池单体输入电能。随着电池功率越来越大的发展趋势，转接构件的板料厚度也相应设计增大。在一些应用场景下，转接构件需要设计为折弯形状，由于转接构件的板料厚度较大，导致折弯加工困难，难以满足成型精度需求。
基于以上考虑，发明人经过深入研究，提供了一种转接构件、电池单体、电池及用电装置，该转接构件在折弯处容易成型，且折弯位置较为准确，成型精度较高，从而可以提升电池单体和电池的性能和品质。
本申请实施例中公开的电池单体可以应用于动力电池或储能电池。其中，动力电池的应用场景包括但不限于车辆、船舶、飞行器、航天器、电动工具、电动玩具，各类移动终端等等。储能电池的应用场景包括但不限于太阳能发电***、水力发电***、风力发电***，等等。
如图1所示，为本申请一些实施例提供的车辆1000的结构示意图。该车辆1000的具体类型不限，例如为新能源电动汽车，其包括电池100、控制器200和马达300。电池100可以为整车的各个用电模块供电，例如，为控制器200、马达300、以及操控***和空调等(图中未示出)供电。
如图2A所示，为本申请一些实施例提供的电池100的结构示意图，该电池100包括箱体120，以及位于箱体120内的多个电池单体10。箱体120为电池单体10提供容纳 空间。箱体120可以包括第一部分121和第二部分122，第一部分121与第二部分122相互盖合，第一部分121和第二部分122共同限定出容纳空间。在电池100中，多个电池单体10之间可以串联或并联或混联，其中，混联是指多个电池单体10的连接方式中既有串联又有并联。电池100在组装时，可以先将多个电池单体10以串联或并联或混联的方式连接在一起，然后再将多个电池单体10整体置于箱体120内。
如图2B所示，本申请另一些实施例提供的电池100包括箱体120以及位于箱体120内的多个电池模块1200。箱体120可以包括第一部分121和第二部分122，第一部分121和第二部分122共同限定出容纳空间。每个电池模块1200包括固定壳1201，以及位于固定壳1201内的、通过串联或并联或混联方式组合的多个电池单体10。此外，电池100还可以包括汇流部件(图中未示出)，用于实现多个电池模块1200之间的电连接。
如图3A、图3B和图3C所示，本申请一些实施例提供的电池单体10，包括具有容纳腔的壳体110、与壳体110连接的端盖(如正极端盖102和负极端盖103)、设置于壳体110内且具有极耳(如负极极耳107和图中由于视角原因未示出的正极极耳)的电芯组件101、设置于端盖的电极端子(如正极电极端子106a和负极电极端子106b)，以及由本申请以下一些实施例提供的转接构件500(如正极转接构件500a和图中由于视角原因未示出的负极转接构件，正极转接构件和负极转接构件可以采用相同的结构设计)。此外，电池单体10通常还包括位于壳体110内的电解液(图中未示出)。
正极转接构件500a可以与正极电极端子106a和正极极耳连接(例如焊接或者铆接)，负极转接构件可以与负极电极端子106b和负极极耳107连接(例如焊接或者铆接)，以实现电极端子与相应极耳之间的电性连接。正极电极端子106a和负极电极端子106b用于与外部导电结构连接，从而输出电池单体10的电能或者向电池单体10输入电能。此外，可以通过多个电池单体10的正极电极端子106a和负极电极端子106b以及外部电路设计实现多个电池单体10的串联或并联或混联。
如图3A、图3B和图3C所示，在一些实施例中，电芯组件101为卷绕式电芯组件，壳体呈筒状(例如圆筒状、方筒状或者扁筒状等)，正极端盖102盖合于壳体110的一端，负极端盖103盖合于壳体110的另一端，正极电极端子106a设于正极端盖102(如图3B所示)，负极电极端子106b设于负极端盖103(如图3A所示)。正极端盖102和负极端盖103上可以分别设置凸起结构，正极电极端子106a(例如图中2个正极电极端子106a)和负极电极端子106b(例如图中2个负极电极端子106b)分别嵌入对应的凸起 结构中。此外，正极端盖102和/或负极端盖103上可以设置用于注入电解液的注液孔104，正极端盖102和/或负极端盖103上还可以设置泄压机构105，例如防爆阀。
在该实施例中，电芯组件101主要由正极极片和负极极片(图中未示出)卷绕形成，并且在正极极片与负极极片之间设有隔膜(图中未示出)。正极极片和负极极片设有活性物质的部分各自作为其主体部分，正极极片和负极极片未设有活性物质的部分各自构成正极极耳和负极极耳107。在该实施例中，正极极耳和负极极耳107位于主体部的两端，分别经过了揉平处理从而呈扁平状。
本申请实施例提供的转接构件用于电池单体(例如图3A所示的电池单体10)，转接构件整体呈折叠弯曲形状，包括多个片状部分和将多个片状部分连接的至少一个折弯部分，其中，至少一个折弯部分设有减薄区。转接构件的该设计使得其在加工时更容易实现弯折，而且折弯位置更加准确，成型精度较高，从而可以提升电池单体和电池的性能和品质。
如图4A、图4B、图5A和图5B所示，其中，图4A为本申请一些实施例的转接构件的立体结构示意图，图4B为图4A中沿B-B向剖切的截面结构示意图，图5A为本申请一些实施例的转接构件处于展平状态的立体结构示意图，图5B为图5A中沿C-C向剖切的截面结构示意图。
本申请实施例提供的用于电池单体的转接构件500，其整体呈折叠弯曲形状，包括多个片状部分51和将多个片状部分51连接的至少一个折弯部分52，其中，至少一个折弯部分52设有减薄区520。
转接构件500可以由金属板料加工而成。在本申请实施例中，片状部分51的整体外形大致呈平板状，折弯部分52相对于片状部分51弯曲并呈弯曲状，从而使得转接构件500整体呈现折叠弯曲形状。转接构件500整体呈折叠弯曲形状，可以更好的适应电池单体的内部空间。转接构件500在电池单内部与电极端子以及电芯组件的极耳分别连接(例如可以是焊接或者铆接)，可以起到良好的导电连接作用。
折弯部分52的减薄区520经过了减薄处理，所以厚度相比转接构件500的其它区域的最大厚度较小。在对减薄区520进行减薄设计的前提下，各个片状部分51、折弯部分52的除减薄区520之外的区域可以采用一致的厚度。此外，一些片状部分51也可以在局部区域进行减薄。
在本申请实施例中，“厚度”定义为转接构件500的某个部分或区域的板料的厚度，而非其整体结构形状所导致的厚度。
本申请实施例的转接构件500在至少一个折弯部分52设减薄区520，该减薄区520相比转接构件500的其它区域的最大厚度较小。相比相关技术中无减薄设计的转接构件，本申请实施例提供的转接构件500在加工时更容易实现弯折，而且折弯位置更加准确，成型精度较高，因此可以提升电池单体和电池的性能和品质。
在本申请实施例中，对于减薄区520的减薄处理可以采用锻造、冲压、镦、材料去除等至少一种机加工工艺实现。可以在减薄区520的任意一侧表面进行减薄处理，从而获得预期厚度。也可以先在减薄区520的一侧表面进行减薄处理，再在其另一侧表面继续进行减薄处理，最终获得预期厚度。
如图5A、图5B和图5C所示，由于在减薄区520进行了减薄处理，从而使得折弯部分52在减薄区520形成减薄凹槽53，该实施例减薄凹槽53形成在减薄区520的一侧。减薄凹槽53的设计可以使得减薄区520获得相对较小的厚度，从而使得转接构件500在加工时更容易实现弯折，而且折弯位置更加准确。
如图5C所示，在该实施例中，减薄凹槽53还可以形成在减薄区520的另一侧。此外，还可以在减薄区520的两侧分别形成减薄凹槽53。减薄凹槽53可以根据工艺和设计需求进行灵活设计。
如图5B所示，减薄凹槽43的侧壁向远离凹槽的中心倾斜，从而形成倒角结构，使得加工更容易进行。
如图5B所示，在本申请实施例中，折弯部分52的宽度定义为折弯部分52处于展平状态时，其尺寸相对较小的窄边边缘的尺寸，也就是说，折弯部分52的宽度为，在转接构件500处于展平状态时，折弯部分52在转接构件500长度方向上的尺寸。
减薄区520的宽度定义为转接构件500处于展平状态时，在减薄区520所形成的减薄凹槽53的底面宽度。如图5B所示，折弯部分52的宽度可以等于其上对应设置的减薄区520的宽度。也即，将折弯部分52整体进行减薄，使其厚度小于转接构件500的其它部分的最大厚度。
在一些实施例中，折弯部分52的宽度也可以大于其上对应设置的减薄区520的宽度，即只对折弯部分52的部分区域进行减薄，这样，仍能实现易折弯且折弯位置更加准确的技术效果。
转接构件500的折叠弯曲形状不限，其包括多个片状部分51和至少一个折弯部分52。在一些实施例中，如图4A、图4B中所示，多个片状部分51包括第一片状部分511、第二片状部分512和第三片状部分513，至少一个折弯部分52包括第一折弯部分521和 第二折弯部分522，第一片状部分511、第一折弯部分521、第二片状部分512、第二折弯部分522和第三片状部分513依次连接，其中，第一折弯部分521和第二折弯部分522的折弯方向相反，使得转接构件500整体上大致呈现Z字形折弯，第一片状部分511用于与电池单体的电极端子连接，可以实现转接构件500与电极端子的电连接，第三片状部分513用于与电池单体的极耳连接，可以实现转接构件500与极耳的电连接。转接构件500可以选用铝、铜等导电性能较佳的片材制作。
在该实施例中，第一折弯部分521和第二折弯部分522上均设置有减薄区520，使得转接构件500的两个折弯部分在加工时均容易实现弯折，成型精度更高。
在另一些实施例中，转接构件的多个片状部分还可以包括第一片状部分和第二片状部分，转接构件的至少一个折弯部分包括第一折弯部分，第一片状部分、第一折弯部分和第二片状部分依次连接，其中，第一片状部分用于与电池单体的电极端子连接，第二片状部分用于与电池单体的极耳连接。转接构件的形状可以根据需要灵活设计。
在一些实施例中，转接构件500的用于与电极端子连接的片状部分51，如第一片状部分511，其上开设有用于与电极端子装配的穿孔56。电池单体在组装时，电极端子***穿孔56并且与该第一片状部分511焊接固定。如图4A所示，第一片状部分511的边缘可以具有定位缺口57。该定位缺口57的形状不限，其能够与电池单体内相应设计的定位结构配合，从而可以提高转接构件500的安装精度以及降低装配的难度。穿孔56和定位缺口57可以通过冲压工艺形成。
在一些实施例中，转接构件500的用于与极耳连接的片状部分51，如第三片状部分513，其包括主体区5130和焊接区5131。主体区5130与第二弯折部分522一体连接，焊接区5131用于与极耳焊接。
如图4A所示，在一些实施例中，焊接区5131具有背向相邻的片状部分51(即背向第二片状部分512)***的至少一个焊接凹槽55。焊接凹槽55背向相邻的片状部分51***，也即在与电芯组件组装后朝向电芯组件的极耳***。焊接凹槽55可以通过冲压工艺形成。焊接凹槽55的数量和具体结构形式不限，可以是各种适当的形状，例如V形、十字形、圆形、条形等等。如图5A所示，在该实施例中，第三片状部分513具有两个呈V形并且对称布置的焊接凹槽55。
焊接凹槽55的设计不但可以提高结构强度，而且可以增加转接构件500与极耳焊接接触的可靠性，使得连接更加可靠，从而可以改善电池单体的性能和使用寿命。在一 些实施例中，第三片状部分513设计有定位孔58，用于焊接时定位，可以提高焊接装配的精度。
在本申请的一些实施例中，可以将第三片状部分513的焊接区5131的厚度设计为小于其主体区5130的厚度。由于焊接区5131主要用于与极耳焊接，将其厚度设计地相对主体区5130更薄，可以减少焊接应力，提高其与极耳的焊接连接强度，使得焊接更加可靠。
在本申请实施例中，转接构件500的具体形状、规格尺寸应当结合电池单体及相关部件的具体规格尺寸来进行相应设计。
如图5B所示，在一些实施例中，转接构件500的最大厚度为T 1，各个减薄区520的厚度为T 2，其中，T 1/4≤T 2≤0.6毫米，优选地，T 1/3≤T 2≤0.4毫米。
在该实施例中，各个片状部分51的最大厚度可以均为T 1，各个减薄区520的厚度可以均为T 2。为减薄区520设计适当的厚度，可以兼顾到转接构件500的内阻设计需求、结构强度需求、成型工艺的易实施性和精度需求。
本申请的发明人在经过大量试验后得出，当T 1/3≤T 2≤0.4毫米时，转接构件500更容易实现弯折，可以获得更高的成型精度，在电池单体中也更容易装配到位。
在一些实施例中，如图5A和图5B所示，转接构件500的用于与极耳连接的片状部分51，如第三片状部分513，包括主体区5130和焊接区5131，其中，主体区5130的厚度为T 1，与该主体区5130连接的弯折部分52(如图中的第二弯折部分522)的减薄区520的厚度为T 2，其中，T 1/4≤T 2≤0.6毫米。这样，可以兼顾到转接构件500的内阻设计需求、结构强度需求、成型工艺的易实施性和精度需求。
在一些实施例中，转接构件500的最大厚度T 1不小于0.3毫米，且不大于2毫米。可以参考此范围对片状部分51进行厚度设计，从而满足结构强度需求和内阻设计需求。例如，在一些实施例中，可以将转接构件500的最大厚度T 1设计为0.4毫米、0.6毫米、0.8毫米、1毫米、1.2毫米、1.4毫米、1.6毫米、1.8毫米、或者2毫米。
在一些实施例中，减薄区的厚度T 2不小于0.1毫米，且不大于0.6毫米。可以参考此范围对减薄区520进行厚度设计，使得折弯部分52容易实现弯折，从而获得更高的成型精度。例如，在一些实施例中，可以将减薄区520的厚度T 2设计为0.1毫米、0.2毫米、0.3毫米、0.4毫米、0.5毫米或者0.6毫米。
如图5A和图5B所示，在本申请的一些实施例中，折弯部分52的宽度等于其上对应设置的减薄区520的宽度。将减薄区520的宽度设计的尽量大，可以使折弯部分52更容易实现弯折。
在本申请的一些实施例中，相邻两个片状部分51之间的最小间隙尺寸为H，将该相邻两个片状部分51相连接的折弯部分52的宽度为L，其中，3.14×H/2≤L≤3.14×H。
如图4B所示，在该实施例中，H 1表示第一片状部分511和第二片状部分512之间的最小间隙尺寸，H 2表示第二片状部分512和第三片状部分513之间的最小间隙尺寸。如图5B所示，L 1表示位于第一片状部分511和第二片状部分512之间的第一弯折部分521的宽度，L 2表示位于第二片状部分512和第三片状部分513之间的第一弯折部分522的宽度。
上述H 1,H 2,L 1,L 2之间满足：3.14×H 1/2≤L 1≤3.14×H 1，3.14×H 2/2≤L 2≤3.14×H 2。该实施例可以使折弯部分52处于适当的折弯半径，从而易于成型，并有利于减小转接构件的内阻。
间隙尺寸H和折弯部分52的宽度L的适当设计，可以使折弯部分52处于适当的折弯半径，从而易于成型，并有利于减小转接构件500的内阻。
在一些实施例中，各个折弯部分52的宽度不小于1毫米且不大于10毫米，可以使折弯部分52处于适当的折弯半径，从而易于成型。例如，在一些实施例中，根据转接构件500的规格不同，可以将折弯部分52的宽度设计为1毫米、3毫米、5毫米、7毫米、或者10毫米。
在本申请实施例中，减薄区520的宽度可以为减薄凹槽53的底面宽度，减薄区520的厚度为该减薄凹槽53的底面所对应区域的厚度。
各个折弯部分52的宽度(如L 1,L 2)可以相同或者不相同，与其所对应的最小间隙尺寸(如H 1,H 2)相关。在一些实施例中，折弯部分52的宽度等于其上对应设置的减薄区520的宽度，也就是减薄凹槽53的底面宽度，并且，折弯部分52的宽度不小于1毫米且不大于10毫米，从而使折弯部分52处于适当的折弯半径，易于成型，并有利于减小转接构件500的内阻。
如图4A和图4B所示，本申请一些实施例提供的转接构件500，包括依次连接的第一片状部分511、第一折弯部分521、第二片状部分512、第二折弯部分522和第三片状部分513，其中，第一折弯部分521和第二折弯部分522的折弯方向相反，第一片状部分511用于与电池单体的电极端子焊接，第三片状部分513用于与电池单体的极耳焊接。第一片状部分511开设有用于与电极端子装配的穿孔56，并且边缘具有定位缺口57。第 三片状部分513包括主体区5130和焊接区5131，并且设计有用于焊接定位的定位孔58，焊接区5131的厚度小于主体区5130的厚度，并且具有背向第二片状部512分***的至少一个焊接凹槽55。第三片状部分513的主体区5130的厚度为T1，减薄区520的厚度为T2，其中，T1/4≤T2≤0.6毫米。
如图4B和图5B所示，转接构件500的最大厚度为T 1。第一折弯部分521和第二折弯部分522的全部区域进行了减薄，减薄区520的厚度均为T 2。在一些实施例中，T 1/4≤T 2≤0.6毫米。可以参照如下范围进行厚度设计：T 1/3≤T 2≤0.4毫米。
如图4B和图5B所示，第一片状部分511与第二片状部分512之间的最小间隙尺寸H 1与第一折弯部分521的宽度L 1之间满足：3.14×H 1/2≤L 1≤3.14×H 1。第二片状部分512与第三片状部分513之间的最小间隙尺寸H 2与第二折弯部分522的宽度L 2之间满足：3.14×H 2/2≤L 2≤3.14×H 2。
本申请上述实施例设计的转接构件500，其在折弯处容易成型，且折弯位置较为准确，成型精度较高，从而可以提升电池的性能和品质。
如图6所示，根据本申请的一些实施例，还提供了一种用电装置2000，包括前述任一实施例的电池100，该电池100包括多个前述实施例的电池单体10。用电装置2000可以是任意一种需要使用到电池100的装置，其电池100的性能和品质可以基于电池单体10的转接构件500的设计而获得相应提升。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (18)

  1. 一种转接构件，用于电池单体，所述转接构件呈折叠弯曲形状，包括多个片状部分和将所述多个片状部分连接的至少一个折弯部分，至少一个所述折弯部分设有减薄区。
  2. 根据权利要求1所述的转接构件，其中，多个所述片状部分包括第一片状部分和第二片状部分，所述至少一个折弯部分包括第一折弯部分，所述第一片状部分、所述第一折弯部分和所述第二片状部分依次连接，其中，
    所述第一片状部分用于与所述电池单体的电极端子连接，所述第二片状部分用于与所述电池单体的极耳连接。
  3. 根据权利要求1所述的转接构件，其中，多个所述片状部分包括第一片状部分、第二片状部分和第三片状部分，所述至少一个折弯部分包括第一折弯部分和第二折弯部分，所述第一片状部分、所述第一折弯部分、所述第二片状部分、所述第二折弯部分和所述第三片状部分依次连接，其中，
    所述第一折弯部分和所述第二折弯部分的折弯方向相反，所述第一片状部分用于与所述电池单体的电极端子连接，所述第三片状部分用于与所述电池单体的极耳连接。
  4. 根据权利要求3所述的转接构件，其中，所述第一折弯部分和所述第二折弯部分上均设置有所述减薄区。
  5. 根据权利要求1至4中任一项所述的转接构件，其中，所述转接构件的最大厚度为T 1，各个所述减薄区的厚度为T 2，其中，T 1/4≤T 2≤0.6毫米，优选地，T 1/3≤T 2≤0.4毫米。
  6. 根据权利要求1至5中任一项所述的转接构件，其中，所述转接构件的最大厚度不小于0.3毫米，且不大于2毫米。
  7. 根据权利要求1至6中任一项所述的转接构件，其中，所述减薄区的厚度不小于0.1毫米，且不大于0.6毫米。
  8. 根据权利要求1至7中任一项所述的转接构件，其中，一个所述折弯部分的宽度等于其上对应设置的所述减薄区的宽度。
  9. 根据权利要求1至8中任一项所述的转接构件，其中，相邻两个所述片状部分之间的最小间隙尺寸为H，相邻两个所述片状部分相连接的所述折弯部分的宽度为L，其中，3.14×H/2≤L≤3.14×H。
  10. 根据权利要求8或9所述的转接构件，其中，各个所述折弯部分的宽度不小于1毫米且不大于10毫米。
  11. 根据权利要求1至10中任一项所述的转接构件，其中，
    每个所述折弯部分在所述减薄区的一侧或两侧形成减薄凹槽。
  12. 根据权利要求11所述的转接构件，其中，
    所述减薄凹槽的侧壁向远离凹槽的中心倾斜。
  13. 根据权利要求1至12中任一项所述的转接构件，其中，
    所述多个片状部分中的其中一个片状部分用于与所述电池单体的极耳焊接，该其中一个片状部分包括主体区和焊接区，其中，所述弯折部分连接于所述主体区，所述主体区的厚度为T 1，所述减薄区的厚度为T 2，其中，T 1/4≤T 2≤0.6毫米。
  14. 根据权利要求13所述的转接构件，其中，所述焊接区具有背向相邻的所述片状部分***的至少一个焊接凹槽。
  15. 一种电池单体，包括：
    壳体，具有容纳腔；
    端盖，与所述壳体连接以封闭所述容纳腔；
    电芯组件，设置于所述容纳腔内且具有极耳；
    电极端子，设置于所述端盖；以及
    权利要求1至14中任一项所述的转接构件，所述转接构件连接所述极耳和所述电极端子。
  16. 根据权利要求15所述的电池单体，其中，所述电芯组件为卷绕式电芯组件，所述电池单体包括呈筒状的所述壳体以及正极端盖和负极端盖，其中，所述正极端盖盖合于所述壳体的一端，所述负极端盖盖合于所述壳体的另一端。
  17. 一种电池，包括：以串联和/或并联方式组合的多个根据权利要求15或16所述的电池单体。
  18. 一种用电装置，包括根据权利要求15或16所述的电池单体。
PCT/CN2022/110665 2022-08-05 2022-08-05 转接构件、电池单体、电池及用电装置 WO2024026861A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN108701802A (zh) * 2016-02-29 2018-10-23 锂能源和电力有限责任两合公司 能量存储装置和用于制造能量存储装置的方法
CN112332040A (zh) * 2020-08-31 2021-02-05 宁德时代新能源科技股份有限公司 电池单体、电池组、用电装置及电池单体的制造方法
CN212783703U (zh) * 2020-08-31 2021-03-23 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置
CN114122631A (zh) * 2021-11-27 2022-03-01 东莞市万连实业有限公司 一种新型电芯电极转接片的制备方法
CN114649556A (zh) * 2020-12-21 2022-06-21 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108701802A (zh) * 2016-02-29 2018-10-23 锂能源和电力有限责任两合公司 能量存储装置和用于制造能量存储装置的方法
CN112332040A (zh) * 2020-08-31 2021-02-05 宁德时代新能源科技股份有限公司 电池单体、电池组、用电装置及电池单体的制造方法
CN212783703U (zh) * 2020-08-31 2021-03-23 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置
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CN114122631A (zh) * 2021-11-27 2022-03-01 东莞市万连实业有限公司 一种新型电芯电极转接片的制备方法

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