Battery pack and electric device

Abstract

The utility model discloses a battery pack and a power utilization device, and belongs to the technical field of batteries, the battery pack comprises a single battery and a busbar, the single battery has a height direction, the single battery comprises a shell, an electrode assembly, a cover plate assembly and a sealing plate, the cover plate assembly comprises a cover plate body and a pole, the cover plate body is connected with the shell and covers a containing cavity, and the pole is arranged in the containing cavity. The cover plate body is provided with a pole hole penetrating along the height direction, the pole penetrates through the pole hole, the pole is provided with a through hole penetrating along the height direction, the through hole is communicated with the accommodating cavity, and the tab penetrates through the through hole and is connected with the pole; the sealing plate is connected with one side, deviating from the electrode assembly, of the pole and covers and seals the through hole; the busbar is fixedly connected with the side, away from the electrode assembly, of the sealing plate. According to the embodiment of the invention, the pole is provided with the through hole, the sealing plate seals the through hole to prevent impurities from entering, and the busbar is fixedly connected with the sealing plate.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery pack and an electrical device. Background Technology

[0002] In a secondary battery, the tabs need to be connected to the terminals to draw out the electrical energy of the electrode assembly. The tabs leading out from the electrode assembly body need to be bent to ensure the connection area between the tabs and the electrode terminals, thus ensuring the reliability of the connection and the overcurrent capacity between the tabs and the electrode terminals.

[0003] However, the bent tabs occupy space inside the secondary battery, resulting in low space utilization of the secondary battery. Utility Model Content

[0004] Purpose of the utility model: The embodiments of this application provide a battery pack and an electrical device, which aim to solve the technical problem of space occupation caused by the welding connection between the busbar and the terminal post.

[0005] Technical solution: This application provides a battery pack, including individual cells, each cell having a height orientation, and each cell comprising:

[0006] The shell has a receiving cavity;

[0007] An electrode assembly, located within a receiving cavity, includes an electrode body and a tab connected to each other;

[0008] A cover plate assembly includes a cover plate body and an electrode post. The cover plate body is connected to the housing and covers the receiving cavity. The cover plate body has an electrode post hole that extends through the height direction. The electrode post passes through the electrode post hole. The electrode post has a through hole that extends through the height direction and connects to the receiving cavity. An electrode ear passes through the through hole and is connected to the electrode post.

[0009] The sealing plate is connected to the side of the electrode post opposite to the electrode assembly and covers the sealing groove.

[0010] The battery pack also includes a busbar, which is fixedly connected to the side of the cover plate away from the electrode assembly.

[0011] In some embodiments, the single cell includes an insulating element disposed on the side of the cover body away from the electrode assembly and surrounding a portion connected to the terminal post, the insulating element being spaced apart from the busbar.

[0012] In some embodiments, the electrode post includes an electrode post body and an electrode post base. The electrode post body passes through an electrode post hole and is connected to the sealing plate around it. The electrode post base is located on the side of the electrode post body near the electrode assembly and is connected to the electrode post body. The electrode post base has the through hole.

[0013] In some embodiments, the pole base has a through hole, the pole body has a groove, the through hole and the groove are connected, and the sealing plate is connected to the pole body and covers the groove.

[0014] In some embodiments, the electrode body is provided with an electrode body portion and a limiting platform portion, the electrode body portion being connected around the limiting platform portion; in the height direction, the electrode body portion protrudes relative to the limiting platform portion toward the side away from the electrode assembly, and a sealing plate is connected to the side of the limiting platform portion away from the electrode assembly.

[0015] In some embodiments, the side of the electrode body away from the electrode assembly is flush with or protrudes from the sealing plate.

[0016] In some embodiments, the side of the sealing plate closest to the electrode assembly is connected to the electrode post base.

[0017] In some embodiments, the sealing plate and the busbar are integrally formed.

[0018] In some embodiments, the busbar includes a first connecting portion and a second connecting portion, the first connecting portion extending along the height direction of the cover plate body and connected to the sealing plate, and the second connecting portion extending along a direction intersecting the height direction and connected to the first connecting portion.

[0019] Accordingly, this application provides an electrical device including the battery pack described above.

[0020] Beneficial Effects: The battery pack of this application embodiment includes a single battery cell, which includes a housing, an electrode assembly, a cover assembly, and a sealing plate. The housing has a receiving cavity; the electrode assembly is located within the receiving cavity and includes an electrode body and a tab connected to each other; the cover assembly includes a cover body and a terminal post, the cover body is connected to the housing and seals the receiving cavity, the cover body has a height direction, and the cover body has a terminal post hole that extends through the height direction, the terminal post passes through the terminal post hole, the terminal post has a through hole that communicates with the receiving cavity, and the tab passes through the through hole and is connected to the terminal post; the sealing plate is connected to the side of the terminal post away from the electrode assembly and seals the through hole; the busbar is fixedly connected to the side of the sealing plate away from the electrode assembly. In the embodiment of this application, the terminal post has a through hole, the sealing plate blocks the through hole to prevent debris from entering, and the busbar is fixedly connected to the sealing plate. There is no need to fold the tabs; the tabs can be directly inserted into the through holes and welded to the electrode posts to achieve electrical connection between the tabs and the electrode body. This effectively reduces the distance between the electrode body and the cover plate assembly, further improving space utilization and thus increasing energy density.

[0021] The electrical device in this application includes the battery pack described above. Therefore, the electrical device can have all the technical features and beneficial effects of the battery pack described above, which will not be repeated here. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of the first type of single-cell battery according to an embodiment of this application;

[0024] Figure 2 This is an exploded view of the first type of single-cell battery according to an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a second type of single-cell battery according to an embodiment of this application;

[0026] Figure 4 yes Figure 3 AA section view;

[0027] Figure 5 This is a schematic diagram of the structure of a third type of single-cell battery according to an embodiment of this application;

[0028] Figure 6 yes Figure 5 BB section view;

[0029] Figure 7 This is a schematic diagram of the structure of the fourth type of single-cell battery according to an embodiment of this application;

[0030] Figure 8 yes Figure 7 CC section view;

[0031] Figure 9 This is a schematic diagram of the structure of the fifth type of single-cell battery according to an embodiment of this application;

[0032] Figure 10 yes Figure 9 DD sectional view;

[0033] Figure 11 This is a schematic diagram of the structure of the sixth type of single-cell battery according to an embodiment of this application;

[0034] Figure 12 yes Figure 11 EE sectional view;

[0035] Figure 13 This is a schematic diagram of the structure of a pole column according to an embodiment of this application.

[0036] Reference numerals: 1. Housing; 2. Electrode assembly; 3. Cover plate assembly; 4. Sealing plate; 5. Busbar; 6. Insulator; 10. Receiving cavity; 20. Electrode body; 21. Electrode tab; 30. Cover plate body; 31. Electrode post; 50. First connecting part; 51. Second connecting part; 300. Electrode post hole; 310. Through hole; 311. Electrode post body; 312. Electrode post base; 313. Groove; 3110. Electrode post main body; 3111. Limiting platform; X, Height direction. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles from 80° to 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles from 10° is considered parallel.

[0039] The applicant noted that as power battery technology matures and is widely used in electric vehicles and energy storage, the requirements for the performance and safety of power batteries are increasing. Battery packs typically consist of multiple individual cells connected by busbars, which are welded to terminals. This process occupies space in the height direction of the battery pack, hindering the improvement of space utilization.

[0040] In view of this, embodiments of this application provide a battery pack, including a single battery cell. The single battery cell includes a housing, an electrode assembly, a cover assembly, and a sealing plate. The housing has a receiving cavity; the electrode assembly is located within the receiving cavity and includes an electrode body and a tab connected to each other; the cover assembly includes a cover body and a terminal post, the cover body is connected to the housing and seals the receiving cavity, the cover body has a height direction, and the cover body has a terminal post hole that extends through the height direction, the terminal post passing through the terminal post hole, the terminal post having a through hole communicating with the receiving cavity, and the tab passing through the through hole and connected to the terminal post; the sealing plate is connected to the side of the terminal post away from the electrode assembly and seals the through hole; the battery pack also includes a busbar, fixedly connected to the side of the sealing plate away from the electrode assembly. In embodiments of this application, the terminal post has a through hole, the sealing plate blocks the through hole to prevent debris from entering, and the busbar is fixedly connected to the sealing plate. Furthermore, there is no need to fold the tabs; they can be directly inserted into the through-hole and welded to the electrode post to achieve electrical connection between the electrode post and the electrode body. This effectively reduces the distance between the electrode body and the cover plate assembly, further improving space utilization and thus increasing energy density.

[0041] The battery pack and power supply device of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0042] Figure 1 This is a schematic diagram of the structure of the first type of single-cell battery according to an embodiment of this application; Figure 2 This is an exploded view of the first type of single-cell battery according to an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a second type of single-cell battery according to an embodiment of this application; Figure 4 yes Figure 3 AA section view; Figure 5 This is a schematic diagram of the structure of a third type of single-cell battery according to an embodiment of this application; Figure 6 yes Figure 5 BB section view; Figure 7 This is a schematic diagram of the structure of the fourth type of single-cell battery according to an embodiment of this application; Figure 8 yes Figure 7 CC section view; Figure 9 This is a schematic diagram of the structure of the fifth type of single-cell battery according to an embodiment of this application; Figure 10 yes Figure 9 DD sectional view; Figure 11 This is a schematic diagram of the structure of the sixth type of single-cell battery according to an embodiment of this application; Figure 12 yes Figure 11 EE sectional view; Figure 13 This is a schematic diagram of the structure of a pole post 31 according to an embodiment of this application.

[0043] refer to Figures 1 to 13This application provides a battery pack, in which a single battery cell has a height direction X. The single battery cell includes a housing 1, an electrode assembly 2, a cover assembly 3, and a sealing plate 4. The housing 1 has a receiving cavity 10. The electrode assembly 2 is located within the receiving cavity 10 and includes an electrode body 20 and a tab 21 connected to each other. The cover assembly 3 includes a cover body 30 and a terminal post 31. The cover body 30 is connected to the housing 1 and seals the receiving cavity 10. The cover body 30 has a through-feature extending along the height direction X. The battery pack includes a terminal post hole 300, through which a terminal post 31 passes. The terminal post 31 has a through hole 310 extending along the height direction X, connecting to the receiving cavity 10. A tab 21 passes through the through hole 310 and connects to the terminal post 31. A sealing plate 4 is connected to the side of the terminal post 31 away from the electrode assembly 2 and seals the through hole 310. The battery pack also includes a busbar 5, which is fixedly connected to the side of the sealing plate 4 away from the electrode assembly 2. The busbar 5 is used to achieve electrical connection between multiple individual battery cells. In the embodiment of this application, the terminal post 31 has a through hole 310, and the sealing plate 4 seals the through hole 310 to prevent debris from entering. The busbar 5 is fixedly connected to the sealing plate 4. Alternatively, depending on the requirements, while ensuring current flow, the busbar 5 and the sealing plate 4 can be thinned to reduce the space occupied by the battery pack and improve energy density. Furthermore, there is no need to fold the tab 21; the tab 21 can be directly inserted into the through hole 310 and welded to the pole post 31 to achieve electrical connection between the pole post 31 and the electrode body 20. This effectively reduces the distance between the electrode body 20 and the cover plate assembly 3, further improving space utilization and thus increasing energy density.

[0044] exist Figure 12 In the illustrated embodiment, the single cell includes an insulating member 6, which is disposed on the side of the cover body 30 away from the electrode assembly 2 and surrounds a portion connected to the terminal post 31. The insulating member 6 is spaced apart from the busbar 5. A portion of the insulating member 6 is disposed between the cover body 30 and the terminal post 31 through a terminal post hole 300 to isolate the current between the cover body 30 and the terminal post 31. In some embodiments, the busbar 5 is welded to the sealing plate 4. By spaced the insulating member 6 from the busbar 5 in the height direction X, the embodiments of this application can reduce the thermal impact on the insulating member 6 during the welding of the busbar 5, avoid the insulating member 6 being burned, deformed, or softened, and thus ensure the insulation performance of the insulating member 6.

[0045] exist Figure 2 , Figure 4 , Figure 6 , Figure 8 , Figure 10 , Figure 12 and Figure 13In the illustrated embodiment, the electrode post 31 includes an electrode post body 311 and an electrode post base 312. The electrode post body 311 passes through the electrode post hole 300 and is connected to the cover plate 4. The electrode post base 312 is located on the side of the electrode post body 311 closest to the electrode assembly 2 and is connected to the electrode post body 311. The electrode post base 312 has a through hole 310, through which the electrode tab 21 passes to connect with the electrode post base 312, and the electrode tab 21 and the electrode post base 312 are connected by through welding. This arrangement allows the electrode tab 21 to be directly connected to the electrode post 31, eliminating the need for a connecting piece and folding the electrode tab 21. This effectively reduces the distance between the electrode body 20 and the cover plate assembly 3, improving the space utilization inside the battery pack and thus increasing the energy density. The terminal body 311 has a groove 313, and the through hole 310 communicates with the groove 313. The sealing plate 4 is connected to the terminal body 311 and covers the groove 313 to prevent debris from entering the groove 313 and the through hole 310. The groove 313 can further reduce the overall weight of the terminal 31. While ensuring current flow, it can also thin the busbar 5 and the sealing plate 4, reduce the space occupied by the battery pack, and improve the energy density.

[0046] It should be noted that the insulating component 6 is connected to the pole body 311 in a surrounding manner.

[0047] exist Figures 1 to 8 , Figure 12 , Figure 13 In the illustrated embodiment, the electrode body 311 is provided with an electrode main body 3110 and a limiting platform 3111, with the electrode main body 3110 surrounding and connected to the limiting platform 3111. In the height direction X, the electrode main body 3110 protrudes relative to the limiting platform 3111 towards the side away from the electrode assembly 2, and the sealing plate 4 is connected to the side of the limiting platform 3111 away from the electrode assembly 2. The sealing plate 4 abuts against the limiting platform 3111 along the height direction X and is connected to the electrode body 311 by adhesive or welding, which ensures the sealing effect of the sealing plate 4, thereby preventing dust, moisture, metal debris and other impurities from entering the groove 313 and the through hole 310 through the gap between the sealing plate 4 and the electrode body 311, thus improving the safety and reliability of the single cell.

[0048] In some embodiments, the side of the electrode post body 311 away from the electrode assembly 2 is flush with or protrudes from the sealing plate 4. Figures 1 to 5 In the illustrated embodiment, the side of the electrode post body 311 furthest from the electrode assembly 2 is flush with the sealing plate 4. Figures 7 to 10In the illustrated embodiment, the electrode post body 311 protrudes from the sealing plate 4 on the side away from the electrode assembly 2. The electrode post body 311 has a limiting platform 3111 to limit the sealing plate 4, so that the sealing plate 4 seals the groove 313 and is positioned below the top surface of the electrode post body 311. With this configuration, when the busbar 5 is welded to the sealing plate 4, the electrode post body 311 located between the insulating component 6 and the sealing plate 4 can play an insulating role, extending the heat conduction path, thereby further reducing the thermal impact on the insulating component 6, preventing the insulating component 6 from being burned or softened, and thus ensuring the insulation performance of the insulating component 6.

[0049] exist Figure 9 and Figure 10 In the illustrated embodiment, the sealing plate 4 is connected to the electrode base 312 on the side near the electrode assembly 2. The sealing plate 4 and the electrode base 312 are connected by adhesive or laser welding, so that the sealing plate 4 in the groove 313 seals the through hole 310, preventing dust, moisture, metal debris and other debris from entering the through hole 310 through the gap between the sealing plate 4 and the electrode body 311, thereby improving the safety and reliability of the single cell.

[0050] exist Figure 11 and Figure 12 In the illustrated embodiment, the sealing plate 4 and the busbar 5 are integrally formed. This configuration eliminates the need for laser welding between the busbar 5 and the sealing plate 4. When connecting multiple individual cells, the busbars 5 of adjacent individual cells can be interconnected to achieve electrical connection between multiple individual cells, thereby improving the assembly efficiency of the battery pack.

[0051] In some embodiments, the busbar 5 includes a first connecting portion 50 and a second connecting portion 51. The first connecting portion 50 extends along the height direction X of the cover body 30 and is connected to the sealing plate 4. The second connecting portion 51 extends along a direction intersecting the height direction X and is connected to the first connecting portion 50. The first connecting portion 50 is located within the groove 313 and is connected to the sealing plate 4 and the second connecting portion 51, respectively. The second connecting portion 51 extends along a direction intersecting the height direction X and is connected to the second connecting portion 51 of an adjacent single cell to achieve electrical connection between multiple single cells.

[0052] In some embodiments, a single cell refers to a basic unit capable of converting chemical energy into electrical energy, which can be used to make batteries or battery packs to supply power to electrical devices or energy storage devices.

[0053] In some embodiments, a single cell can be a rechargeable cell, which refers to a cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0054] In some embodiments, a single battery cell may be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but this application embodiment does not limit this.

[0055] In some embodiments, a battery pack may be a single physical module comprising one or more individual cells to provide higher voltage and capacity. When there are multiple individual cells, they may be connected in series, parallel, or a combination thereof.

[0056] In some embodiments, when multiple individual cells form a battery pack, the current of the individual cells is discharged through a busbar 5 connected to the sealing plate 4. The dimensions of the sealing plate 4 in the height direction X and in the direction intersecting the height direction X are defined to accommodate battery packs requiring different charging and discharging currents. For example, refer to... Figures 1 to 4 In the illustrated embodiment, when the dimension of the sealing plate 4 in the direction intersecting the height direction X is large, according to the current density formula J = I / S, where J is the current density, I is the current, and S is the cross-sectional area, a larger cross-sectional area can reduce the current density under high current conditions, thereby reducing heat generation. Therefore, the sealing plate 4 with a larger cross-sectional area is suitable for battery packs requiring high-current charging and discharging, such as superchargeable battery packs that need to withstand currents above 4C, ensuring the stability of the battery pack during high-current charging and discharging. (Reference) Figure 5 and Figure 6 The embodiment shown is suitable for battery packs that require low-current charging and discharging when the size of the sealing plate 4 in the direction intersecting with the height direction X is small.

[0057] Accordingly, this application provides an electrical device including the aforementioned battery pack. The battery pack is used to power the electrical device. This electrical device can be a mobile phone, portable device, laptop computer, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0058] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0059] The battery pack and power device provided in the embodiments of this application have been described in detail above, and 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 technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery pack, characterized in that, Includes a single battery cell, the single battery cell having a height orientation, the single battery cell comprising: The shell has a receiving cavity; An electrode assembly is located within the receiving cavity, and the electrode assembly includes an electrode body and a tab connected to each other. A cover plate assembly, the cover plate assembly including a cover plate body and an electrode post, the cover plate body being connected to the housing and sealing the receiving cavity, the cover plate body having an electrode post hole extending through the height direction, the electrode post being inserted through the electrode post hole, the electrode post having a through hole extending through the height direction, the through hole communicating with the receiving cavity, and an electrode ear being inserted through the through hole and connected to the electrode post; A sealing plate is connected to the side of the pole opposite to the electrode assembly and covers the through hole; The battery pack also includes a busbar, which is fixedly connected to the side of the cover plate away from the electrode assembly.

2. The battery pack according to claim 1, characterized in that, The single cell includes an insulating element disposed on the side of the cover plate body away from the electrode assembly and surrounding a portion of the terminal post. The insulating element is spaced apart from the busbar.

3. The battery pack according to claim 1, characterized in that, The electrode post includes an electrode post body and an electrode post base. The electrode post body passes through the electrode post hole and is connected to the sealing plate. The electrode post base is located on the side of the electrode post body closer to the electrode assembly and is connected to the electrode post body. The electrode post base has the through hole.

4. The battery pack according to claim 3, characterized in that, The pole body has a groove, the through hole is connected to the groove, and the sealing plate is connected to the pole body and covers the groove.

5. The battery pack according to claim 3, characterized in that, The electrode post body is provided with an electrode post main body and a limiting platform, the electrode post main body being connected to the limiting platform around the limiting platform; in the height direction, the electrode post main body is provided to protrude from the limiting platform towards the side away from the electrode assembly, and the sealing plate is connected to the limiting platform away from the electrode assembly.

6. The battery pack according to claim 3, characterized in that, The side of the electrode post body away from the electrode assembly is flush with or protrudes from the sealing plate.

7. The battery pack according to claim 3, characterized in that, The sealing plate is connected to the electrode base on the side closest to the electrode assembly.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The sealing plate is integrally formed with the busbar.

9. The battery pack according to claim 1, characterized in that, The busbar includes a first connecting part and a second connecting part. The first connecting part extends along the height direction of the cover plate body and is connected to the sealing plate. The second connecting part extends along a direction intersecting the height direction and is connected to the first connecting part.

10. An electrical device, characterized in that, Includes the battery pack as described in any one of claims 1 to 9.

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