Secondary battery and electric device

Abstract

The utility model discloses a secondary battery and a power utilization device, the secondary battery has a length direction and a height direction which are intersected, and the secondary battery comprises a shell, a plurality of electrode assemblies, a connecting piece, a first insulating piece and a second insulating piece; the shell is provided with a containing cavity, a plurality of electrode assemblies and connecting pieces, the first insulating piece and the second insulating piece are arranged in the containing cavity, the electrode assemblies are arranged at intervals in the length direction, the connecting pieces are arranged between every two adjacent electrode assemblies, and the electrode assemblies are electrically connected with the connecting pieces respectively; in the height direction, the first insulating part and the second insulating part are arranged on the two sides of the multiple electrode assemblies, and the first insulating part and the second insulating part are both connected with the connecting part. The plurality of electrode assemblies are connected in series through the connecting pieces, so that the secondary battery has relatively high voltage, meanwhile, the plurality of electrode assemblies and the connecting pieces form a whole by utilizing the first insulating pieces and the second insulating pieces and are assembled in the accommodating cavity of the shell, and the stability of the internal structure of the secondary battery is facilitated while the insulating property is maintained.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a secondary battery and an electrical device. Background Art

[0002] In power battery systems, to increase overall voltage, power battery packs are typically powered by multiple secondary batteries connected in series or in a mixed series-parallel arrangement. However, given a generally fixed battery pack size, the multiple coils within a single secondary battery are typically connected in parallel, resulting in a low voltage per battery. Furthermore, each secondary battery has its own independent housing, terminals, and other structures, occupying a significant amount of space within the battery pack, resulting in a suboptimal overall voltage increase. Utility Model Content

[0003] Purpose of the utility model: An embodiment of the present application provides a secondary battery, aiming to solve the problem of low voltage of existing secondary batteries; another purpose of an embodiment of the present application is to provide an electrical device.

[0004] Technical solution: A secondary battery according to an embodiment of the present application has intersecting length and height directions, including:

[0005] A housing having a receiving cavity;

[0006] A plurality of electrode assemblies are disposed in the accommodating cavity and arranged along the length direction;

[0007] A connector is provided in the accommodating cavity; along the length direction, the connector is provided between two adjacent electrode assemblies, and the two adjacent electrode assemblies are respectively conductively connected to the connector, so that the two adjacent electrode assemblies are connected in series;

[0008] a first insulating member disposed in the accommodating cavity, the first insulating member being disposed on one side of the plurality of electrode assemblies along the height direction, the first insulating member being connected to the connecting member;

[0009] A second insulating member is disposed in the accommodating cavity. The second insulating member is disposed along the height direction on a side of the plurality of electrode assemblies away from the first insulating member. The second insulating member is connected to the connecting member.

[0010] In some embodiments, the connecting member includes an insulating bracket and a conductive part, the insulating bracket is respectively connected to the first insulating member and the second insulating member, the conductive part is connected to the insulating bracket, at least part of the insulating bracket and the conductive part are arranged between the first insulating member and the second insulating member along the height direction; the two adjacent electrode assemblies include a first electrode assembly and a second electrode assembly; along the length direction, the connecting member is provided between the first electrode assembly and the second electrode assembly, the first electrode assembly is provided with a first pole ear on the side facing the second electrode assembly, and the second electrode assembly is provided with a second pole ear on the side facing the first electrode assembly, the polarity of the first pole ear and the second pole ear are opposite, and the first pole ear and the second pole ear are respectively conductively connected to the conductive part of the connecting member.

[0011] In some embodiments, the conductive portion includes:

[0012] a first conductor, conductively connected to the first tab;

[0013] The second conductor is connected to the first conductor along the length direction, and the second conductor is conductively connected to the second tab.

[0014] In some embodiments, the secondary battery further has a width direction intersecting the length direction and the height direction, and the conductive portion includes:

[0015] a first conductor, conductively connected to the first tab;

[0016] The second conductor is connected to the first conductor along the width direction, and the second conductor is conductively connected to the second tab.

[0017] In some embodiments, the conductive portion includes:

[0018] a first conductor, conductively connected to the first tab;

[0019] The second conductor is connected to the first conductor along the height direction, and the second conductor is conductively connected to the second tab.

[0020] In some embodiments, the secondary battery also has a width direction intersecting with the length direction and the height direction, the first pole tab extends along the length direction, and at least a portion of the first pole tab is conductively connected to the first conductor along the width direction; the second pole tab extends along the length direction, and at least a portion of the second pole tab is conductively connected to the second conductor along the width direction.

[0021] In some embodiments, the first electrode assembly includes a first winding core, the first electrode tab includes a first section and a second section, the first section is connected to the first winding core along the length direction, and the first section is connected to the second section at one end away from the first winding core; along the width direction, at least a portion of the second section is spaced apart from the first section, and the side of the second section away from the first section is conductively connected to the first conductor; and / or, the second electrode assembly includes a second winding core, the second electrode tab includes a third section and a fourth section, the third section is connected to the second winding core along the length direction, and the end of the third section away from the second winding core is connected to the fourth section; along the width direction, at least a portion of the fourth section is spaced apart from the third section, and the side of the fourth section away from the third section is conductively connected to the second conductor.

[0022] In some embodiments, along the length direction, the first conductor is arranged opposite to the first electrode assembly, and the second conductor is arranged opposite to the second electrode assembly; the first electrode assembly includes a first winding core, the first pole tab includes a first segment and a second segment, the first segment is connected to the first winding core along the length direction, the first segment is connected to the second segment at one end away from the first winding core, the second segment is bent relative to the first segment, and the second segment is conductively connected to the first conductor along the length direction; the second electrode assembly includes a second winding core, the second pole tab includes a third segment and a fourth segment, the third segment is connected to the second winding core along the length direction, the third segment is connected to the fourth segment at one end away from the second winding core, the fourth segment is bent relative to the third segment, and the fourth segment is conductively connected to the second conductor along the length direction.

[0023] In some embodiments, the insulating bracket is provided with a first through hole, and the conductive part is embedded in the first through hole; the first insulating member is provided with a second through hole, and the insulating bracket can be movably passed through the second through hole along the length direction; the second insulating member is provided with a third through hole, and the insulating bracket can be movably passed through the third through hole along the length direction.

[0024] In some embodiments, the insulating support comprises:

[0025] a body, at least partially disposed between two adjacent electrode assemblies, the first through hole penetrating the body; at least partially disposed between the first insulating member and the second insulating member along the height direction, the body being movably disposed in the second through hole and the third through hole, respectively;

[0026] a first limiting portion connected to the body along the height direction, the first limiting portion being arranged on a side of the first insulating member away from the electrode assembly;

[0027] The second limiting portion is connected to the main body along the height direction, and the second limiting portion is arranged on a side of the second insulating member away from the electrode assembly.

[0028] In some embodiments, at least a portion of the first insulating member is connected to the electrode assembly, and at least a portion of the second insulating member is connected to the electrode assembly.

[0029] In some embodiments, the first conductor and the second conductor are made of the same metal material.

[0030] In some embodiments, the first conductor and the second conductor are made of dissimilar metallic materials.

[0031] Accordingly, an electrical device described in an embodiment of the present application includes a secondary battery as described in any one of the aforementioned embodiments.

[0032] Beneficial effects: Compared with the prior art, a secondary battery according to an embodiment of the present application has intersecting length and height directions, and includes a shell, multiple electrode assemblies, a connector, a first insulating member, and a second insulating member; the shell has a receiving cavity, multiple electrode assemblies are arranged in the receiving cavity and arranged along the length direction, a connector is arranged in the receiving cavity, a connector is arranged between two adjacent electrode assemblies along the length direction, and two adjacent electrode assemblies are respectively conductively connected to the connector, so that the two adjacent electrode assemblies are connected in series; a first insulating member is arranged in the receiving cavity, the first insulating member is arranged on one side of the multiple electrode assemblies along the height direction, and the first insulating member is connected to the connector; a second insulating member is arranged in the receiving cavity, the second insulating member is arranged on the side of the multiple electrode assemblies away from the first insulating member along the height direction, and the second insulating member is connected to the connector. In the present application, multiple electrode assemblies are arranged along the length direction and connected in series through the connector, so that the secondary battery has a higher voltage. At the same time, the first insulating member and the second insulating member are used to form a whole of multiple electrode assemblies and the connector and assemble them into the receiving cavity of the shell, which is beneficial to the internal structural stability of the secondary battery while maintaining insulation performance.

[0033] Compared with the prior art, the electric device of the embodiment of the present application includes the secondary battery as described in any one of the above embodiments. It is understood that the electric device of the embodiment of the present application has all the technical features and technical effects of the above secondary batteries, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 Schematic diagram of the overall structure of the secondary battery of an embodiment of the present application;

[0036] Figure 2 This is a schematic structural diagram of a secondary battery according to an embodiment of the present application without its outer shell;

[0037] Figure 3 This is an exploded view of a secondary battery in which a tab is connected to a conductive portion along a width direction according to an embodiment of the present application;

[0038] Figure 4 This is a schematic diagram of the overall structure of a connector according to an embodiment of the present application;

[0039] Figure 5 is a cross-sectional view of a connector according to an embodiment of the present application;

[0040] Figure 6 is an exploded view of a connector according to an embodiment of the present application;

[0041] Figure 7 yes Figure 6 A cross-sectional view of a connector according to an embodiment;

[0042] Figure 8 yes Figure 3 A cross-sectional view of a secondary battery of an embodiment in the width direction;

[0043] Figure 9 yes Figure 3 A cross-sectional view of a secondary battery of an embodiment in a height direction;

[0044] Figure 10 yes Figure 9 An enlarged view of the embodiment in which the tab of portion A is not bent;

[0045] Figure 11 yes Figure 9 An enlarged view of an embodiment of a bent second tab in section A;

[0046] Figure 12 yes Figure 9 An enlarged view of an embodiment of a bent first tab in section A;

[0047] Figure 13 yes Figure 9 An enlarged view of an embodiment in which the first and second tabs of portion A are both bent;

[0048] Figure 14 is an enlarged view of a secondary battery in which a tab is connected to a conductive portion along a length direction according to an embodiment of the present application;

[0049] Figure 15 yes Figure 14A cross-sectional view of a secondary battery of an embodiment in the width direction;

[0050] Figure 16 yes Figure 14 A cross-sectional view of a secondary battery of an embodiment in a height direction;

[0051] Figure 17 yes Figure 16 Enlarged view of part B;

[0052] Figure 18 This is a schematic diagram of the overall structure of a connector in which a first conductor and a second conductor are connected along a height direction according to an embodiment of the present application;

[0053] Figure 19 yes Figure 18 An exploded view of a secondary battery in which a connector is connected to an electrode assembly along a width direction according to an embodiment;

[0054] Figure 20 yes Figure 19 A cross-sectional view of a secondary battery of an embodiment in the width direction;

[0055] Figure 21 yes Figure 18 An exploded view of a secondary battery in which a connector is connected to an electrode assembly along a length direction according to an embodiment;

[0056] Figure 22 yes Figure 21 A cross-sectional view of a secondary battery according to an embodiment, taken in the width direction.

[0057] Figure markings: 1. Shell; 11. Accommodating cavity; 2. Electrode assembly; 21. First electrode assembly; 211. First pole ear; 2111. First section; 2112. Second section; 212. First winding core; 22. Second electrode assembly; 221. Second pole ear; 2211. Third section; 2212. Fourth section; 222. Second winding core; 3. Connector; 31. Bracket; 311. First through hole; 312. Main body; 313. First limiting portion; 314. Second limiting portion; 32. Conductive portion; 321. First conductor; 322. Second conductor; 4. First insulating member; 41. Second through hole; 5. Second insulating member; 51. Third through hole; X, length direction; Y, width direction; Z, height direction. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0059] In the description of the present application, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly and specifically defined. In the description of this application, "vertical" means completely vertical at 90° or almost completely vertical, for example, an angle within the range of 80° to 100° is considered vertical. Similarly, "parallel" means completely parallel or almost completely parallel, for example, an angle within 10° of completely parallel is considered parallel.

[0060] It should also be noted that in the drawings of this application, arrows marked X indicate the length direction X, arrows marked Y indicate the width direction Y, and arrows marked Z indicate the height direction Z. The first direction Z, the second direction Y, and the third direction X are introduced to facilitate description of the structural positional relationship of the secondary battery and to facilitate understanding of its structure. In the embodiments of this application, the length direction X, the width direction Y, and the height direction Z intersect with each other. Furthermore, the length direction X, the width direction Y, and the height direction Z are perpendicular to each other.

[0061] As the power source for new energy vehicles, battery packs are composed of multiple secondary batteries connected in series and parallel. These batteries include prismatic and cylindrical batteries. Prismatic batteries typically consist of multiple electrode assemblies connected in parallel. This results in a low voltage for each secondary battery. However, due to vehicle space constraints, the battery pack's overall space is relatively fixed, limiting the number of prismatic batteries that can be installed. Consequently, the overall voltage of the battery pack is suboptimal.

[0062] In view of this, an embodiment of the present application provides a secondary battery, aiming to solve the above-mentioned problem.

[0063] Please refer to Figure 1-Figure 3 、 Figure 8 、 Figure 9 、 Figure 14-16 、 Figures 19-22, an embodiment of the present application provides a secondary battery, which has an intersecting length direction X and height direction Z, and includes a shell 1, multiple electrode assemblies 2, a connector 3, a first insulating member 4 and a second insulating member 5; the shell 1 has a accommodating cavity 11, multiple electrode assemblies 2 are arranged in the accommodating cavity 11 and arranged along the length direction X, the connector 3 is arranged in the accommodating cavity 11, along the length direction X, the connector 3 is arranged between two adjacent electrode assemblies 2, and the two adjacent electrode assemblies 2 are respectively conductively connected to the connector 3, so that the two adjacent electrode assemblies 2 are connected in series; the first insulating member 4 is arranged in the accommodating cavity 11, the first insulating member 4 is arranged on one side of the multiple electrode assemblies 2 along the height direction Z, and the first insulating member 4 is connected to the connector 3; the second insulating member 5 is arranged in the accommodating cavity 11, the second insulating member 5 is arranged on the side of the multiple electrode assemblies 2 away from the first insulating member 4 along the height direction Z, and the second insulating member 5 is connected to the connector 3.

[0064] In an embodiment of the present application, multiple electrode assemblies 2 are arranged along the length direction X and connected in series through a connector 3, so that a single secondary battery has a higher voltage. At the same time, the first insulating member 4 and the second insulating member 5 are used to realize that the multiple electrode assemblies 2 and the connector 3 are formed into a whole and assembled into the accommodating cavity 11 of the shell 1. While maintaining the insulation performance between the electrode assembly 2 and the shell 1, it is beneficial to the structural stability of the secondary battery and avoids the outer surface of the electrode assembly 2 being worn by the shell 1 during assembly.

[0065] Specifically, the connector 3 of the embodiment of the present application has a metal conductive portion 32. The tabs output at the opposite ends of the two adjacent electrode assemblies 2 are electrically opposite. At this time, the tabs on both sides are connected together by the metal portion of the connector 3, so that the two adjacent electrode assemblies 2 can be connected in series. Among them, the tabs can be welded to the connector 3. Since the tabs of the electrode assembly 2 are relatively soft, when multiple electrode assemblies 2 are connected in series through the connector 3, there will be structural instability between the connector 3 and the electrode assembly 2, and relative displacement will occur. At this time, it is easy to cause the tabs to break, causing the secondary battery to fail. Therefore, in the embodiment of the present application, a first insulating member 4 and a second insulating member 5 are respectively provided on both sides of the electrode assembly 2 in the height direction Z. At this time, the first insulating member 4 and the second insulating member 5 are respectively connected to the multiple electrode assemblies 2 and the connector 3 between the two adjacent electrode assemblies 2. The first insulating member 4 and the second insulating member 5 are fixed from both sides along the height direction Z to the multiple electrode assemblies 2 and the connector 3 between the two adjacent electrode assemblies 2, so as to achieve a stable internal structure of the shell 1 of the secondary battery. At the same time, the first insulating member 4 and the second insulating member 5 effectively reduce the relative displacement between the electrode assembly 2 and the connecting member 3, thereby effectively protecting the tabs and preventing the tabs from breaking, and also preventing the connection between the tabs and the connecting member 3 from breaking. In addition, the first insulating member 4 and the second insulating member 5 are arranged on both sides of the electrode assembly 2 along the height direction Z, which can effectively protect the electrode assembly 2 and prevent the electrode assembly 2 from being worn due to friction between the electrode assembly 2 and the inner side wall of the housing 1. At the same time, they serve to separate the electrode assembly 2 from the inner side wall of the housing 1, achieving a good insulation effect.

[0066] It should be noted that the first insulating member 4 and the second insulating member 5 of the embodiment of the present application are made of hard plastic with a certain thickness, so as to have a certain structural strength and facilitate maintaining the relative positions of various components inside the secondary battery fixed.

[0067] It should also be noted that the multiple electrode assemblies 2 in the embodiment of the present application can be two or more, that is, the secondary battery includes at least two electrode assemblies 2, and at least two electrode assemblies 2 are connected in series along the length direction X to achieve a higher voltage for a single secondary battery.

[0068] It should also be noted that, along the length direction X, a top cover sheet is usually provided at the end of the electrode assembly 2 at both ends away from the connector 3. At this time, a pressure relief piece and an electrode terminal are provided on the top cover sheet. A pole ear is also provided at the end of the electrode assembly 2 away from the connector 3. The pole ear is connected to the electrode terminal, and the electrode terminals on the top cover sheets at both ends are used to realize the charging and discharging of the secondary battery.

[0069] Please refer to Figure 4-Figure 7 and Figure 18In some embodiments, the connector 3 includes an insulating bracket 31 and a conductive portion 32, the insulating bracket 31 is respectively connected to the first insulating member 4 and the second insulating member 5, and the conductive portion 32 is connected to the insulating bracket 31, and at least a portion of the insulating bracket 31 and the conductive portion 32 are arranged between the first insulating member 4 and the second insulating member 5 along the height direction Z; the two adjacent electrode assemblies 2 include a first electrode assembly 21 and a second electrode assembly 22; along the length direction X, a connector 3 is provided between the first electrode assembly 21 and the second electrode assembly 22, a first electrode ear 211 is provided on the side of the first electrode assembly 21 facing the second electrode assembly 22, and a second electrode ear 221 is provided on the side of the second electrode assembly 22 facing the first electrode assembly 21, the polarity of the first electrode ear 211 and the second electrode ear 221 are opposite, and the first electrode ear 211 and the second electrode ear 221 are respectively conductively connected to the conductive portion 32 of the connector 3.

[0070] In the embodiment of the present application, the connector 3 is provided with an insulating bracket 31 and a conductive portion 32, and is conductively connected to the tabs of the electrode assemblies 2 on both sides only through the conductive portion 32. The insulating bracket 31 is used to support the conductive portion 32, so that the two adjacent electrode assemblies 2 can be connected in series using only the conductive portion 32. At this time, a single secondary battery can also have a higher voltage. At the same time, the insulating bracket 31 is connected to the first insulating member 4 and the second insulating member 5 to achieve the fixation of the connector 3. The setting of this structure not only ensures the conductive performance of the connector 3, but also spaces the insulating bracket 31 between the two adjacent electrode assemblies 2, and achieves the insulation of the two adjacent electrode assemblies 2 except for the part where the tabs are connected to the conductive portion 32, thereby improving the safety of the secondary battery. At the same time, it can play a better supporting and isolating effect, reduce the movement of the electrode assembly 2 along the length direction X, and thus reduce the possibility of tab breakage.

[0071] It should be noted that, in the embodiment of the present application, the conductive portion 32 can be made of a single conductive material or a composite of two materials. Figure 5 As shown, when the conductive portion 32 is made of a material, the conductive portion 32 can be made of pure aluminum. While ensuring the conductive performance, pure aluminum is relatively low in cost and light in weight, which is conducive to the lightweighting of the secondary battery. Secondly, since the positive tab can usually be made of aluminum, the conductive portion 32 is also easy to weld to the tab. Figure 6 、 Figure 7 and Figure 17When the conductor is made of two materials, it is preferably a composite of copper and aluminum, that is, half aluminum and half copper. In this case, the aluminum portion of the conductive portion 32 is welded to the positive electrode tab (made of aluminum), and the copper portion of the conductive portion 32 is welded to the negative electrode tab (made of copper). This composite structure facilitates welding connections to the tabs of adjacent electrode assemblies 2, ensures high electrical conductivity and conductivity between adjacent electrode assemblies 2, and also has good corrosion resistance.

[0072] It should also be noted that when the conductive portion 32 is made of a single material, the orientation of the conductive portion 32, or the connector 3, can be set as needed. That is, the connector 3 can be arranged relative to the electrode assembly 2 along the length direction X. The connector 3 can also extend along the length direction X and be arranged relative to the housing 1 along the width direction Y. The above-mentioned configurations of the connector 3 all enable smooth welding connection between the conductive portion 32 and the tab. At the same time, when the conductive portion 32 is made of a single material, the material usage of the conductive portion 32 and the insulating bracket 31 can be reasonably reduced, thereby reducing the thickness between the conductive portion 32 and the insulation, which can reduce the space occupied by the connector 3 within the secondary battery, and is conducive to improving the energy density of the battery.

[0073] Please refer to Figure 6 and Figure 7 In some embodiments, the conductive portion 32 includes a first conductor 321 and a second conductor 322 . The first conductor 321 is conductively connected to the first tab 211 . The second conductor 322 is connected to the first conductor 321 along the length direction X. The second conductor 322 is conductively connected to the second tab 221 .

[0074] In the embodiment of the present application, the first conductor 321 and the second conductor 322 are connected along the length direction X, specifically by welding, and are electrically connected therebetween. In this case, along the length direction X, the first conductor 321 is disposed opposite the first tab 211, and the second conductor 322 is disposed opposite the second tab 221; that is, the first conductor 321 faces the first tab 211, and the second conductor 322 faces the second tab 221. This arrangement not only enables a single secondary battery to have a higher voltage, but also reduces the space occupied by the connector 3 along the length direction X, thereby improving the space utilization and energy density within the secondary battery.

[0075] It should be noted that since the tabs are thin metal sheets with narrow end faces, in order to achieve a good welding connection between the tabs and the conductive portion 32, the tabs need to be bent so that a section of the tab is parallel to the side of the conductive portion 32 facing the electrode assembly 2. This provides a larger welding area, achieving a welding connection between the conductive portion 32 and the tabs. Specifically, the first tab 211 is bent and welded to the first conductor 321, and the second tab 221 is bent and welded to the second conductor 322.

[0076] In some embodiments, the secondary battery further has a width direction Y intersecting with the length direction X and the height direction Z. The conductive portion 32 includes a first conductor 321 and a second conductor 322. The first conductor 321 is conductively connected to the first tab 211. The second conductor 322 is connected to the first conductor 321 along the width direction Y. The second conductor 322 is conductively connected to the second tab 221.

[0077] In the embodiment of the present application, the first conductor 321 and the second conductor 322 are connected along the width direction Y, specifically by welding. In this case, the conductive connection between the two facilitates achieving a higher voltage for a single secondary battery after two adjacent electrode assemblies 2 are connected to the conductive portion 32, while also ensuring a high current transmission rate. In this case, the conductive portion 32 is disposed opposite the inner sidewall of the housing 1 along the width direction Y. In this case, the conductive portion 32 can be directly disposed parallel to the first and second tabs 211, 221, and has a larger relative area. Furthermore, along the width direction Y, there is a larger welding space, and when the tabs are welded to the conductive portion 32, there is no obstruction, which further facilitates the welding connection between the tabs and the conductive portion 32.

[0078] It should be noted that in this embodiment, the first tab 211 is disposed on a side of the first conductor 321 away from the second conductor 322 along the width direction Y and is welded to the first conductor 321, and the second tab 221 is disposed on a side of the second conductor 322 away from the first conductor 321 along the width direction Y and is welded to the second conductor 322. In this case, the first tab 211 and the second tab 221 are free from obstructions or interference from other structures, making it easier to weld the first tab 211 to the first conductor 321, and the second conductor 322 to the second tab 221.

[0079] Please refer to Figures 18-22 In some embodiments, the conductive portion 32 includes a first conductor 321 and a second conductor 322 . The first conductor 321 is conductively connected to the first tab 211 . The second conductor 322 is connected to the first conductor 321 along the height direction Z. The second conductor 322 is conductively connected to the second tab 221 .

[0080] In the embodiment of the present application, the first conductor 321 and the second conductor 322 are connected along the height direction Z. This further reduces the thickness of the conductive portion 32, and thus the thickness of the connector 3. This not only enables two adjacent electrode assemblies 2 to be connected in series, resulting in a higher voltage for a single secondary battery, but also reduces the overall volume and material usage of the connector 3, thereby facilitating a lightweight secondary battery. Furthermore, when the conductive portion 32 is positioned relative to the electrode assembly 2 along the length direction X, the space occupied by the connector 3 along the length direction X can be reduced, further facilitating an increase in the energy density of the battery.

[0081] It should be noted that, in some of the above embodiments, the material of the first conductor 321 and the second conductor 322 can be selected according to the material of the first pole tab 211 and the second pole tab 221, so that the conductive part 32 has good conductivity, conductivity and corrosion resistance, and can achieve effective welding connection with the first pole tab 211 and the second pole tab 221.

[0082] It is understood that when the first electrode assembly 21 and the second electrode assembly 22 are connected in series, the positive tab of one electrode assembly 2 must be connected in series with the negative tab of the other electrode assembly 2. Here, the first tab 211 of the first electrode assembly 21 is the positive tab, and the second tab 221 of the second electrode is the negative tab. When the first tab 211 is the positive tab and the second tab 221 is the negative tab, the first conductor 321 is made of aluminum and the second conductor 322 is made of copper. The first conductor 321 and the second conductor 322 can be pre-welded to form a conductive portion 32. The conductive portion 32 is then connected to the insulating bracket 31 to form a connector 3. In this case, the first tab 211 (positive tab) is welded to the first conductor 321 (made of aluminum), and the second tab 221 (negative tab) is welded to the second conductor 322 (made of copper), thereby achieving a series connection between the first electrode assembly 21 and the second electrode assembly 22.

[0083] Please refer to Figure 3 、 Figures 8-13 、 Figure 19 and Figure 20 In some embodiments, the secondary battery further has a width direction Y intersecting the length direction X and the height direction Z. The first electrode tab 211 extends along the length direction X, and at least a portion of the first electrode tab 211 is conductively connected to the first conductor 321 along the width direction Y; the second electrode tab 221 extends along the length direction X, and at least a portion of the second electrode tab 221 is conductively connected to the second conductor 322 along the width direction Y.

[0084] In the embodiment of the present application, the first tab 211 is connected to the first conductor 321 along the width direction Y, and the second tab 221 is connected to the second conductor 322 along the width direction Y. The tabs can be welded to the conductive portion 32 without being bent. Figure 10 As shown, at this time, not only can a single secondary battery have a higher voltage, but the length of the tab can also be shortened as much as possible while meeting the welding space, reducing material consumption, thereby reducing weight and cost.

[0085] It should be noted that in the embodiment of the present application, the first conductor 321 and the second conductor 322 can be connected along the width direction Y or along the height direction Z. Correspondingly, in this case, the first electrode tab 211 and the second electrode tab 221 are respectively arranged on both sides of the conductive portion 32 along the width direction Y. It is only necessary that the first electrode tab 211 and the first conductor 321 are at least partially opposite and welded together, and the second electrode tab 221 and the second conductor 322 are at least partially opposite and welded together.

[0086] Please refer to Figure 11-13 as well as Figure 22 In some embodiments, the first electrode assembly 21 includes a first winding core 212, and the first electrode tab 211 includes a first section 2111 and a second section 2112. The first section 2111 is connected to the first winding core 212 along the length direction X, and the end of the first section 2111 away from the first winding core 212 is connected to the second section 2112; along the width direction Y, at least a portion of the second section 2112 is spaced apart from the first section 2111, and the side of the second section 2112 away from the first section 2111 is electrically conductive with the first conductor 321. connection; and / or, the second electrode assembly 22 includes a second winding core 222, the second electrode tab 221 includes a third segment 2211 and a fourth segment 2212, the third segment 2211 is connected to the second winding core 222 along the length direction X, and the end of the third segment 2211 away from the second winding core 222 is connected to the fourth segment 2212; along the width direction Y, at least a portion of the fourth segment 2212 is spaced apart from the third segment 2211, and the side of the fourth segment 2212 away from the third segment 2211 is conductively connected to the second conductor 322.

[0087] In an embodiment of the present application, a first pole tab 211 is provided to be bent and connected to the first conductor 321, and / or a second pole tab 221 is provided to be bent and connected to the second conductor 322. This can prevent the first pole tab 211 and / or the second pole tab 221 from being torn by force when the first winding core 212 and / or the second winding core 222 are displaced along the length direction X, thereby avoiding abnormal internal resistance or voltage of the secondary battery.

[0088] Please continue to refer to Figure 11-13 as well as Figure 22 It should be noted that, in the above embodiment, the first conductor 321 and the second conductor 322 can be connected along the width direction Y or along the height direction Z. When the first conductor 321 and the second conductor 322 are connected along the height direction Z, the first conductor 321 and the second conductor 322 are both opposite to the inner side wall of the housing 1 along the width direction Y and spaced apart.

[0089] It should also be noted that, in this embodiment, the materials of the first conductor 321 and the second conductor 322 may be different or the same. When the materials are the same, the thickness of the conductive portion 32 may be reduced as needed.

[0090] Please refer to Figure 14-17 、 Figure 21 as well as Figure 22 In some embodiments, along the length direction X, the first conductor 321 is arranged opposite to the first electrode assembly 21, and the second conductor 322 is arranged opposite to the second electrode assembly 22; the first electrode assembly 21 includes a first winding core 212, and the first tab 211 includes a first section 2111 and a second section 2112, the first section 2111 is connected to the first winding core 212 along the length direction X, the end of the first section 2111 away from the first winding core 212 is connected to the second section 2112, and the second section 2112 is bent relative to the first section 2111. The second electrode assembly 22 includes a second winding core 222, and the second electrode tab 221 includes a third segment 2211 and a fourth segment 2212. The third segment 2211 is connected to the second winding core 222 along the length direction X, and the end of the third segment 2211 away from the second winding core 222 is connected to the fourth segment 2212. The fourth segment 2212 is bent relative to the third segment 2211, and the fourth segment 2212 is conductively connected to the second conductor 322 along the length direction X.

[0091] In the embodiment of the present application, the conductive portion 32 is arranged opposite to the first electrode assembly 21 and the second electrode assembly 22 along the length direction X. If the first electrode tab 211 and the second electrode tab 221 extend along the length direction X, only the end surfaces of the first electrode tab 211 and the second electrode tab 221 can contact the conductive portion 32. The end surfaces of the first electrode tab 211 and the second electrode tab 221 have a small area, making welding difficult and the conductive connection unstable. Therefore, in the embodiment of the present application, the first electrode tab 211 and the second electrode tab 221 are bent respectively and connected to the first conductor 321 using the second section 2112, and the fourth section 2212 is connected to the second conductor 322. At this time, there is a large contact area between the second section 2112 and the first conductor 321, and a large contact area between the fourth section 2212 and the second conductor 322, which can ensure a stable welding connection and smooth current transmission, thereby realizing the series connection of two adjacent electrode assemblies 2 to increase the voltage of a single cell. At the same time, the first pole tab 211 is connected to the first conductor 321 after being bent, and the second pole tab 221 is connected to the second conductor 322 after being bent. When the first winding core 212 and / or the second winding core 222 are relatively displaced along the length direction X, the first pole tab 211 and / or the second pole tab 221 can be prevented from being torn by force, thereby avoiding abnormal internal resistance or voltage of the secondary battery.

[0092] Please continue to refer to Figure 14-17 、 Figure 21 as well as Figure 22It should be noted that, in the above embodiment, the first conductor 321 and the second conductor 322 can be connected along the width direction Y or along the height direction Z. When the first conductor 321 and the second conductor 322 are connected along the height direction Z, the first conductor 321 and the second conductor 322 are both opposite to the inner side wall of the housing 1 along the width direction Y and spaced apart.

[0093] It should also be noted that, in this embodiment, the materials of the first conductor 321 and the second conductor 322 may be different or the same. When the materials are the same, the thickness of the conductive portion 32 may be reduced as needed.

[0094] Please refer to Figure 3 、 Figure 6 、 Figure 7 、 Figure 14 、 Figure 18 、 Figure 19 、 Figure 21 In some embodiments, the insulating bracket 31 is provided with a first through hole 311, and the conductive part 32 is embedded in the first through hole 311; the first insulating member 4 is provided with a second through hole 41, and the insulating bracket 31 is movably provided in the second through hole 41 along the length direction X; the second insulating member 5 is provided with a third through hole 51, and the insulating bracket 31 is movably provided in the third through hole 51 along the length direction X.

[0095] In the embodiment of the present application, by providing a first through-hole 311 in the insulating bracket 31, the conductive portion 32 can be embedded in the first through-hole 311. In this case, the insulating space can cover the non-welded surface of the conductive portion 32, thereby isolating the conductive portion 32 from the housing 1, achieving insulation between the conductive portion 32 and the housing 1, and also preventing the conductive portion 32 from contacting the winding core. By respectively passing the insulating bracket 31 through the second through-hole 41 of the first insulating member 4 and the third through-hole 51 of the second insulating member 5, the insulating bracket 31 is connected to the first insulating member 4 and the second insulating member 5, thereby maintaining the relative stability of the connector 3 within the housing 1.

[0096] It should be noted that the second through hole 41 and the third through hole 51 can both be oblong holes or rectangles extending along the length direction X. In this case, the connector 3 can have a relative displacement in the length direction X, that is, the connector 3 can move within the range limited by the second through hole 41 and the third through hole 51, thereby absorbing the relative displacement caused by vibration and impact, and avoiding tearing caused by direct force on the tab.

[0097] Please refer to Figure 5-Figure 7 and Figure 18In some embodiments, the insulating bracket 31 includes a main body 312, a first limiting portion 313 and a second limiting portion 314. The main body 312 is at least partially arranged between two adjacent electrode assemblies 2, and the first through hole 311 passes through the main body 312; at least part of the main body 312 is arranged between the first insulating member 4 and the second insulating member 5 along the height direction Z, and the main body 312 is movably arranged in the second through hole 41 and the third through hole 51 respectively; the first limiting portion 313 is connected to the main body 312 along the height direction Z, and the first limiting portion 313 is arranged on the side of the first insulating member 4 away from the electrode assembly 2; the second limiting portion 314 is connected to the main body 312 along the height direction Z, and the second limiting portion 314 is arranged on the side of the second insulating member 5 away from the electrode assembly 2.

[0098] In the embodiment itself, the first limiting portion 313 and the second limiting portion 314 are respectively arranged on the side of the first insulating member 4 and the second insulating member 5 away from the electrode assembly 2 along the height direction Z, and are used to limit the connecting member 3 along the height direction Z to avoid displacement of the connecting member 3 in the height direction Z, thereby ensuring that the connecting member 3 is relatively fixed in the height direction Z and avoiding tearing of the electrode ear.

[0099] It should be noted that the first limiting portion 313 and the second limiting portion 314 preferably have the same structure, and the second through hole 41 and the third through hole 51 preferably have the same structure. Furthermore, the width of the first limiting portion 313 and the second limiting portion 314 is smaller than the dimensions of the second through hole 41 and the third through hole 51 along the width direction Y, and the length of the first limiting portion 313 and the second limiting portion 314 is smaller than the dimensions of the second through hole 41 and the third through hole 51 along the length direction X. The length of the first limiting portion 313 and the second limiting portion 314 is greater than the dimensions of the second through hole 41 and the third through hole 51 along the width direction Y. This facilitates ensuring that, along the height direction Z, the first limiting portion 313 smoothly passes through the second through hole 41 and is mutually restrained by the first insulating member 4, and the second limiting portion 314 smoothly passes through the third through hole 51 and is mutually restrained by the second insulating member 5.

[0100] Specifically, the long sides of the first limiting portion 313 and the second limiting portion 314 are parallel to the length direction X, and the wide sides of the first limiting portion 313 and the second limiting portion 314 are parallel to the width direction Y. At this time, the first limiting portion 313 can be passed through the second through hole 41, and the second limiting portion 314 can be passed through the third through hole 51. Then, the connecting member 3 is rotated so that the long sides of the first limiting portion 313 and the second limiting portion 314 intersect with the length direction X, and along the height direction Z, the first limiting portion 313 partially overlaps with the first insulating member 4, and the second limiting portion 314 partially overlaps with the second insulating member 5, thereby achieving mutual limitation in the eye height direction Z.

[0101] In some embodiments, at least a portion of the first insulating member 4 is connected to the electrode assembly 2 , and at least a portion of the second insulating member 5 is connected to the electrode assembly 2 .

[0102] In the embodiment of the present application, the first insulating member 4 and the second insulating member 5 are respectively connected to the electrode assembly 2 along the height direction Z, and can be bonded using an adhesive to further ensure the stability of the internal structure of the secondary battery. Of course, the first insulating member 4 and the second insulating member 5 can also be connected to the top cover sheets located at both ends of the housing 1 along the length direction X, in which case the internal structure of the secondary battery can also be maintained stable.

[0103] Accordingly, an electrical device described in an embodiment of the present application includes a secondary battery as described in any one of the aforementioned embodiments.

[0104] It can be understood that the electrical device of the embodiment of the present application has all the technical features and technical effects of the aforementioned secondary battery, which will not be described in detail here.

[0105] Of course, the electrical devices referred to in this application can be application devices such as vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools. Vehicles can be new energy vehicles, which can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiments of this application do not impose any special restrictions on the above-mentioned electrical devices.

[0106] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0107] The above is a detailed introduction to a secondary battery and an electrical device provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A secondary battery, characterized in that: Having intersecting length and height directions, including: A housing having a receiving cavity; A plurality of electrode assemblies are disposed in the accommodating cavity and arranged along the length direction; A connector is provided in the accommodating cavity; along the length direction, the connector is provided between two adjacent electrode assemblies, and the two adjacent electrode assemblies are respectively conductively connected to the connector, so that the two adjacent electrode assemblies are connected in series; a first insulating member disposed in the accommodating cavity, the first insulating member being disposed on one side of the plurality of electrode assemblies along the height direction, the first insulating member being connected to the connecting member; A second insulating member is disposed in the accommodating cavity. The second insulating member is disposed along the height direction on a side of the plurality of electrode assemblies away from the first insulating member. The second insulating member is connected to the connecting member.

2. The secondary battery according to claim 1, wherein The connecting member includes an insulating support and a conductive portion, the insulating support is connected to the first insulating member and the second insulating member respectively, the conductive portion is connected to the insulating support, and at least a portion of the insulating support and the conductive portion are arranged between the first insulating member and the second insulating member along the height direction; The two adjacent electrode assemblies include a first electrode assembly and a second electrode assembly; along the length direction, the connecting member is provided between the first electrode assembly and the second electrode assembly, the first electrode assembly is provided with a first pole ear on the side facing the second electrode assembly, and the second electrode assembly is provided with a second pole ear on the side facing the first electrode assembly, the polarity of the first pole ear and the second pole ear are opposite, and the first pole ear and the second pole ear are respectively conductively connected to the conductive part of the connecting member.

3. The secondary battery according to claim 2, wherein The conductive portion includes: a first conductor, conductively connected to the first tab; The second conductor is connected to the first conductor along the length direction, and the second conductor is conductively connected to the second tab.

4. The secondary battery according to claim 2, wherein: The secondary battery further has a width direction intersecting the length direction and the height direction, and the conductive portion includes: a first conductor, conductively connected to the first tab; The second conductor is connected to the first conductor along the width direction, and the second conductor is conductively connected to the second tab.

5. The secondary battery according to claim 2, wherein The conductive portion includes: a first conductor, conductively connected to the first tab; The second conductor is connected to the first conductor along the height direction, and the second conductor is conductively connected to the second tab.

6. The secondary battery according to claim 4 or 5, characterized in that: The secondary battery further has a width direction intersecting the length direction and the height direction, the first tab extends along the length direction, and at least a portion of the first tab is conductively connected to the first conductor along the width direction; The second electrode tab extends along the length direction, and at least a portion of the second electrode tab is conductively connected to the second conductor along the width direction.

7. The secondary battery according to claim 6, characterized in that The first electrode assembly includes a first winding core, and the first electrode tab includes a first section and a second section, the first section is connected to the first winding core along the length direction, and an end of the first section away from the first winding core is connected to the second section; Along the width direction, at least a portion of the second segment is spaced apart from the first segment, and a side of the second segment away from the first segment is conductively connected to the first conductor; and / or, The second electrode assembly includes a second winding core, and the second electrode tab includes a third segment and a fourth segment. The third segment is connected to the second winding core along the length direction, and the end of the third segment away from the second winding core is connected to the fourth segment; along the width direction, at least a portion of the fourth segment is spaced apart from the third segment, and the side of the fourth segment away from the third segment is conductively connected to the second conductor.

8. The secondary battery according to claim 3 or 5, characterized in that Along the length direction, the first conductor is disposed opposite to the first electrode assembly, and the second conductor is disposed opposite to the second electrode assembly; The first electrode assembly includes a first winding core, and the first electrode tab includes a first segment and a second segment, the first segment is connected to the first winding core along the length direction, an end of the first segment away from the first winding core is connected to the second segment, the second segment is bent relative to the first segment, and the second segment is conductively connected to the first conductor along the length direction; The second electrode assembly includes a second winding core, and the second electrode tab includes a third segment and a fourth segment. The third segment is connected to the second winding core along the length direction, and the end of the third segment away from the second winding core is connected to the fourth segment. The fourth segment is bent relative to the third segment, and the fourth segment is conductively connected to the second conductor along the length direction.

9. The secondary battery according to claim 2, wherein The insulating bracket is provided with a first through hole, and the conductive portion is embedded in the first through hole; The first insulating member is provided with a second through hole, and the insulating bracket is movably arranged in the second through hole along the length direction; The second insulating member is provided with a third through hole, and the insulating bracket is movably arranged in the third through hole along the length direction.

10. The secondary battery according to claim 9, wherein The insulating support comprises: a body, at least partially disposed between two adjacent electrode assemblies, the first through hole penetrating the body; at least partially disposed between the first insulating member and the second insulating member along the height direction, the body being movably disposed in the second through hole and the third through hole, respectively; a first limiting portion connected to the body along the height direction, the first limiting portion being arranged on a side of the first insulating member away from the electrode assembly; The second limiting portion is connected to the main body along the height direction, and the second limiting portion is arranged on a side of the second insulating member away from the electrode assembly.

11. The secondary battery according to claim 2, wherein At least a portion of the first insulating member is connected to the electrode assembly, and at least a portion of the second insulating member is connected to the electrode assembly.

12. The secondary battery according to any one of claims 3 to 5, characterized in that The first conductor and the second conductor are made of the same or different metal materials.

13. An electrical device, characterized in that: The secondary battery comprises the secondary battery according to any one of claims 1 to 12.

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