Core wrap assembly, battery, and battery pack

Abstract

The application provides a core package assembly, a battery and a battery pack. The core package assembly comprises a core package body, a plurality of first tabs and at least one second tab. The core package body comprises two first sides distributed along the length direction of the core package body and two second sides distributed along the width direction of the core package body. The plurality of first tabs are connected to the core package body and extend out of the first sides. The at least one second tab is connected to the core package body and extends out of the second sides. The core package assembly provided by the application can shorten the electronic transmission path between the pole piece of the core package body and the first tabs, thereby shortening the longest electronic transmission path between the pole piece and the tabs, reducing the internal resistance of the core package assembly and improving the performance of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a core pack assembly, a battery, and a battery pack. Background Technology

[0002] In related technologies, for blade batteries or other batteries with longer lengths, the electronic transport path of the cell pack is significantly extended, leading to an increase in the internal resistance of the cell pack and affecting the battery performance. Utility Model Content

[0003] The embodiments of this application provide a chip pack assembly, a battery, and a battery pack, which can improve the technical problem that the long electronic transmission path of the chip pack assembly leads to an increase in the internal resistance of the chip pack assembly.

[0004] In a first aspect, embodiments of this application provide a core package assembly, comprising:

[0005] The core package body includes two first side surfaces distributed along its length direction, and two second side surfaces distributed along its width direction;

[0006] Multiple first tabs are connected to the core package body, and the multiple first tabs extend out of the first side;

[0007] At least one second tab is connected to the core package body, and the at least one second tab extends out of the second side.

[0008] In some embodiments, the plurality of first tabs includes at least two rows of first tabs distributed along the thickness direction of the core package body, with the first tabs in the same row arranged along the width direction. This allows for the arrangement of as many first tabs as possible on the first side of the core package body, which helps to further shorten the longest electron transport path between the core package body and the first tabs, and further reduce the internal resistance of the core package assembly.

[0009] In some embodiments, the first tab extends along the width direction; in the width direction, the ratio of the width of the first tab to the width of the core body is greater than or equal to 20% and less than or equal to 50%, thereby avoiding excessive current concentration in the first tab and reducing material waste of the first tab.

[0010] In some embodiments, the core package assembly includes at least two second tabs distributed along the thickness direction, thereby shortening the longest electron transport path between the first electrode and the first tab, and further reducing the internal resistance of the core package assembly.

[0011] In some embodiments, the second tab extends along the length direction, and the ratio of the total length of the second tab to the length of the core body is greater than or equal to 20% and less than or equal to 80%, thereby making the current of the second tab more balanced, reducing material waste, and reducing the welding difficulty of the second tab.

[0012] In some embodiments, the second electrode tab extends continuously along the length direction, thereby reducing the welding process and cost of the second electrode tab, and lowering the contact resistance of the second electrode tab; alternatively, the second electrode tab includes a plurality of sub-electrodes spaced apart along the length direction, the sub-electrodes extending along the length direction, thereby dispersing the current path of the second electrode tab, reducing the lateral current of the current collector, reducing polarization, and improving consistency. Simultaneously, it also makes the heat distribution of the second electrode tab more uniform, reducing the risk of localized overheating.

[0013] In some embodiments, the length of the first electrode tab extending beyond the first side is greater than or equal to 5 mm and less than or equal to 30 mm. This facilitates bending the first electrode tab and welding it to the connecting structure while avoiding material waste due to excessive length. Simultaneously, it shortens the electromagnetic transmission path of the first electrode tab and reduces its internal resistance; and / or,

[0014] The length of the second electrode extending beyond the second side is greater than or equal to 5mm and less than or equal to 30mm. This facilitates bending the second electrode and welding it to the corresponding connecting structure while avoiding material waste due to excessive length. Simultaneously, it shortens the electromagnetic transmission path of the second electrode and reduces its internal resistance.

[0015] In some embodiments, the core package body includes a first electrode, a second electrode, and a diaphragm stacked along its thickness direction. The first electrode and the second electrode are separated by the diaphragm. The first electrode is connected to the first tab, and the second electrode is connected to the second tab. Thus, the core package body is a stacked core package, which facilitates the connection between the first electrode and the first tab, and the connection between the second electrode and the second tab.

[0016] This application embodiment also provides a battery, including:

[0017] case,

[0018] A core package assembly, wherein the core package assembly is as described above, the core package assembly is installed within the housing, and the core package assembly includes:

[0019] The core package body includes two first side surfaces distributed along its length direction, and two second side surfaces distributed along its width direction;

[0020] Multiple first tabs are connected to the core package body, and the multiple first tabs extend out of the first side;

[0021] At least one second tab is connected to the core package body, and the at least one second tab extends out of the second side.

[0022] This application also provides a battery pack, including the battery as described above.

[0023] The beneficial effects of the embodiments of this application are as follows:

[0024] The core pack assembly provided in this application includes a core pack body, a plurality of first tabs and at least one second tab. By providing a plurality of first tabs on a first side of the core pack body along the length direction and providing at least one second tab on a side of the core pack body along the width direction, the electron transport path between the electrode and the first tab of the core pack body can be shortened, thereby shortening the longest electron transport path between the electrode and the tab, reducing the internal resistance of the core pack assembly, and improving the performance of the battery. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application.

[0027] Figure 2 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0028] Figure 3 This is an exploded structural diagram of one embodiment of the battery provided in this application.

[0029] Figure 4 A schematic diagram of the structure of one embodiment of the core package assembly provided in this application;

[0030] Figure 5 A side view along the length of the core package assembly provided in an embodiment of this application;

[0031] Figure 6 This is a side view of the core package assembly along the width direction provided in an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Battery pack; 2-Battery module; 20-Battery; 21-Housing shell; 211-Outer shell; 2111-Mounting cavity; 2112-Mounting port; 212-Cover plate; 22-First terminal post; 23-Second terminal post; 24-Cell pack assembly; 241-Cell pack body; 2411-First side; 2412-Second side; 242-First tab; 243-Second tab; 3-Box; X-Length direction; Z-Width direction; Y-Thickness direction. Detailed Implementation

[0034] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0035] This application provides a chip pack assembly, a battery, and a battery pack. These will be described in detail below.

[0036] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application. Figure 1 As shown, the battery pack 1 includes a housing 3 and a battery module 2, with the battery module 2 housed within the housing 3. The battery module 2 includes multiple batteries 20.

[0037] Figure 2 This is a schematic diagram of the structure of one embodiment of the battery provided in this application. Figure 3 This is an exploded structural diagram of one embodiment of the battery provided in this application. Figure 2 and Figure 3 As shown, the battery 20 includes a housing 21 and a cell pack assembly 24, with the cell pack assembly 24 installed within the housing 21. The housing 21 includes an outer shell 211 and a cover plate 212, forming a mounting cavity 2111. At least one side of the housing 21 has a mounting opening 2112 communicating with the mounting cavity 2111, used for mounting the cell pack assembly 24 into the mounting cavity 2111, thereby installing the cell pack assembly 24 within the housing 21. The cover plate 212 connects to the housing 21 and covers the mounting opening 2112 to seal it.

[0038] The core package assembly 24 includes a core package body 241, a first electrode tab 242, and a second electrode tab 243, which are respectively connected to the core package body 241. A first electrode post 22 and a second electrode post 23 are provided in the housing 21. When the core package assembly 24 is installed inside the housing 21, the first electrode tab 242 of the core package assembly 24 is connected to the first electrode post 22, and the second electrode tab 243 of the core package assembly 24 is connected to the second electrode post 23.

[0039] The first terminal 22 and the second terminal 23 are mutually insulated, and their polarities are opposite. Correspondingly, the first tab 242 and the second tab 243 also have opposite polarities. That is, the first terminal 22 can be a positive terminal and the second terminal 23 a negative terminal; correspondingly, the first tab 242 can be a positive tab and the second tab 243 a negative tab. Alternatively, the first terminal 22 can be a negative terminal and the second terminal 23 a positive terminal; correspondingly, the first tab 242 can be a negative tab and the second tab 243 a positive tab.

[0040] Specifically, the outer shell 211 has mounting openings 2112 at both ends along the length X direction of the core body 241, which communicate with the mounting cavity 2111. There are two cover plates 212. The two cover plates 212 are connected to the outer shell 211 respectively, and the two cover plates 212 cover the two mounting openings 2112 one by one to seal the two mounting openings 2112.

[0041] One cover plate 212 is provided with a first pole post 22, and the other cover plate 212 is provided with a second pole post 23. The first pole post 22 and / or the second pole post 23 can be insulated from the corresponding cover plate 212. When the core package assembly 24 is installed in the mounting cavity 2111, the first tab 242 of the core package assembly 24 is connected to the first pole post 22 via a connecting structure. The second tab 243 of the core package assembly 24 is connected to the second pole post 23 via another connecting structure.

[0042] Alternatively, the first terminal 22 can be electrically connected to the outer casing 211, thereby connecting the first terminal 22 to the outer casing 211 and thus electrically connecting the first terminal 22 to the first tab 242 through the outer casing 211. Or, the second terminal 23 can be electrically connected to the outer casing 211, thereby connecting the second terminal 23 to the second tab 243 through the outer casing 211.

[0043] In this embodiment, the outer shell 211 can be made of aluminum. The outer shell 211 can be formed by rolling an aluminum plate and then welded together with weld seams.

[0044] Figure 4 This is a schematic diagram of the structure of one embodiment of the core package assembly provided in this application. Figure 4As shown, the core package body 241 includes two first side surfaces 2411 distributed along its length direction X, and two second side surfaces 2412 distributed along its width direction Z. The core package assembly 24 includes a plurality of first tabs 242 connected to the core package body 241, the plurality of first tabs 242 extending out of the first side surfaces 2411 of the core package body 241 to facilitate connection of the plurality of first tabs 242 to corresponding first pole posts 22. The core package assembly 24 includes at least one second tab 243 connected to the core package body 241, at least one second tab 243 extending out of the second side surfaces 2412 to facilitate connection of the second tab 243 to the second pole post 23.

[0045] The core pack assembly 24 provided in this application embodiment includes a core pack body 241, a plurality of first tabs 242 and at least one second tab 243. By providing a plurality of first tabs 242 on a first side 2411 along the length direction X of the core pack body 241 and providing at least one second tab 243 on a side along the width direction Z of the core pack body 241, the electron transmission path between the electrode and the first tab 242 of the core pack body 241 can be shortened, thereby shortening the longest electron transmission path between the electrode and the tab, reducing the internal resistance of the core pack assembly 24, and improving the performance of the battery 20.

[0046] It should be noted that in this embodiment, the length direction X, width direction Z, and thickness direction Y are perpendicular to each other. Specifically, the length of the core package body 241 in the length direction X is greater than its width in the width direction Z and its thickness in the thickness direction Y.

[0047] Figure 5 A side view along the length of a core package assembly provided in an embodiment of this application. In some embodiments, such as Figure 4 and Figure 5 As shown, the multiple first tabs 242 can include at least two rows of first tabs 242 distributed along the thickness direction Y of the core package body 241, with the first tabs 242 in the same row arranged along the width direction Z of the core package body 241. This allows for the arrangement of as many first tabs 242 as possible on the first side surface 2411 of the core package body 241, which helps to further shorten the longest electron transmission path between the core package body 241 and the first tabs 242, and further reduce the internal resistance of the core package assembly 24.

[0048] Specifically, the first tab 242 extends along the width direction Z of the core package body 241. Two rows of first tabs 242 are provided on the first side 2411 of the core package body 241 along the length direction X. Each row of first tabs 242 includes two first tabs 242 spaced apart along the width direction Z of the core package body 241, to disperse the current path of the first tabs 242, reduce the lateral current of the current collector, reduce polarization, and improve consistency. Simultaneously, it also makes the heat distribution of the first tabs 242 more uniform, reducing the risk of localized overheating. The lengths of the multiple first tabs 242 along the width direction Z of the core package body 241 can be equal.

[0049] Of course, the first tabs 242 in the same row can also be made to extend continuously along the width direction Z of the core body 241 to reduce the welding process and cost of the first tabs 242 and reduce the contact resistance of the first tabs 242.

[0050] In some embodiments, such as Figure 5 As shown, the first tab 242 extends along the width direction Z of the core body 241. In the width direction Z of the core body 241, the ratio of the width W1 of the first tab 242 to the width W of the core body 241 is greater than or equal to 20% and less than or equal to 50%, thereby avoiding excessive current concentration in the first tab 242, reducing material waste in the first tab 242, and lowering the welding difficulty of the first tab 242.

[0051] The ratio of the width W1 of the first tab 242 to the width W of the core package body 241 can be 22%, 25%, 28%, 31%, 36%, 41%, 45%, etc., depending on the shape and size of the core package assembly 24, and is not limited here.

[0052] In some embodiments, the length of the first tab 242 extending beyond the first side 2411 can be greater than or equal to 5 mm and less than or equal to 30 mm. This facilitates bending the first tab 242 and welding it to the corresponding connecting structure, while avoiding material waste due to excessive length of the first tab 242. Simultaneously, it can shorten the electromagnetic transmission path of the first tab 242 and reduce its internal resistance.

[0053] The length of the first electrode tab 242 extending beyond the first side surface 2411 is the length of the first electrode tab 242 extending from the end away from the first side surface 2411 to the first side surface 2411. The length of the first electrode tab 242 extending beyond the first side surface 2411 can be 6mm, 10mm, 12mm, 15mm, 18mm, 22mm, 27mm, etc., and there is no limitation here.

[0054] In some embodiments, the core package assembly 24 may include at least two second tabs 243 distributed along the thickness direction Y of the core package body 241, thereby shortening the longest electron transport path between the first electrode and the first tab 242 and further reducing the internal resistance of the core package assembly 24.

[0055] Specifically, the core package assembly 24 includes two second tabs 243. The two second tabs 243 extend along the length direction X of the core package body 241. The two second tabs 243 are disposed along the thickness direction Y of the core package body 241. The two second tabs 243 have equal lengths along the length direction X of the core package body 241.

[0056] Figure 6 A side view along the width direction of a core package assembly provided in an embodiment of this application. In some embodiments, such as Figure 6 As shown, the second tab 243 extends along the length direction X. In the length direction X of the core body 241, the ratio of the total length L1 of the second tab 243 to the length L of the core body 241 is greater than or equal to 20% and less than or equal to 80%, thereby making the current of the second tab 243 more balanced, reducing material waste, and reducing the welding difficulty of the second tab 243.

[0057] In some embodiments, the second tab 243 may be extended continuously along the length direction X, thereby reducing the welding process and cost of the second tab 243 and reducing the contact resistance of the second tab 243.

[0058] In other embodiments, the second tab 243 may include a plurality of sub-tabs spaced apart along the length X of the core package body 241. The sub-tabs of the second tab 243 extend along the length X of the core package body 241, thereby dispersing the current path of the second tab 243, reducing the lateral current of the current collector, reducing polarization, and improving consistency. At the same time, it also makes the heat distribution of the second tab 243 more uniform and reduces the risk of local overheating.

[0059] In some embodiments, the length of the second tab 243 extending beyond the second side 2412 can be greater than or equal to 5 mm and less than or equal to 30 mm. This facilitates bending the second tab 243 and welding it to the corresponding connecting structure, while avoiding material waste due to excessive length. Simultaneously, it can shorten the electromagnetic transmission path of the second tab 243 and reduce its internal resistance.

[0060] The length of the second electrode tab 243 extending beyond the second side surface 2412 is the length of the second electrode tab 243 extending from the end away from the second side surface 2412 to the second side surface 2412. The length of the second electrode tab 243 extending beyond the second side surface 2412 can be 6mm, 10mm, 12mm, 15mm, 18mm, 22mm, 27mm, etc., and there is no limitation here.

[0061] In some embodiments, the core package body 241 may include a first electrode, a second electrode, and a diaphragm stacked along its thickness direction Y. The first electrode and the second electrode are separated by the diaphragm. The first electrode is connected to a first tab 242, and the second electrode is connected to a second tab 243. Thus, the core package body 241 is a stacked core package, which facilitates the connection between the first electrode and the first tab 242, and the connection between the second electrode and the second tab 243.

[0062] This application also provides a battery, which includes a core pack assembly. The specific structure of the core pack assembly is as described in the above embodiments. Since this battery adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0063] The battery 1 includes a housing 21 and a cell pack assembly 24. The structure of the cell pack assembly 24 can be referred to in the above embodiments, and will not be repeated here. The cell pack assembly 24 is installed inside the housing 21.

[0064] This application also provides a battery pack, which includes a battery. The specific structure of the battery is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0065] The battery pack 1 includes a housing 3 and a battery module 2, with the battery module 2 housed within the housing 3. The battery module 2 includes multiple batteries 20, the structure of which can be referred to in the above embodiments and will not be repeated here.

[0066] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A core-packaging assembly, characterized in that, include: The core package body includes two first side surfaces distributed along its length direction, and two second side surfaces distributed along its width direction; Multiple first tabs are connected to the core package body, and the multiple first tabs extend out of the first side; At least one second tab is connected to the core package body, and the at least one second tab extends out of the second side.

2. The core-packaging assembly as described in claim 1, characterized in that, The plurality of first tabs include at least two rows of first tabs distributed along the thickness direction of the core package body, and the first tabs located in the same row are arranged along the width direction.

3. The core-packaging assembly as described in claim 1, characterized in that, The first tab extends along the width direction; in the width direction, the ratio of the width of the first tab to the width of the core body is greater than or equal to 20% and less than or equal to 50%.

4. The core package assembly as described in any one of claims 1 to 3, characterized in that, The core package assembly includes at least two second tabs distributed along the thickness direction of the core package body.

5. The core package assembly as described in any one of claims 1 to 3, characterized in that, The second electrode extends along the length direction, and in the length direction, the ratio of the total length of the second electrode to the length of the core body is greater than or equal to 20% and less than or equal to 80%.

6. The core package assembly as described in any one of claims 1 to 3, characterized in that, The second electrode tab extends continuously along the length direction; or, the second electrode tab includes a plurality of sub-electrodes spaced apart along the length direction, the sub-electrodes extending along the length direction.

7. The core package assembly as described in any one of claims 1 to 3, characterized in that, The length of the first electrode tab extending beyond the first side is greater than or equal to 5 mm and less than or equal to 30 mm; and / or, The length of the second electrode extending beyond the second side is greater than or equal to 5 mm and less than or equal to 30 mm.

8. The core package assembly as described in any one of claims 1 to 3, characterized in that, The core package body includes a first electrode, a second electrode, and a diaphragm stacked along its thickness direction. The first electrode and the second electrode are separated by the diaphragm. The first electrode is connected to the first tab, and the second electrode is connected to the second tab.

9. A battery, characterized in that, include: case, The core package assembly according to any one of claims 1 to 8, wherein the core package assembly is installed within the housing.

10. A battery pack, characterized in that, Includes the battery as described in claim 9.

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