Battery module

Abstract

The utility model discloses a battery module, and relates to the technical field of power supply equipment. The battery module comprises a battery cell and a protection plate, wherein the battery cell is provided with at least two tabs; wherein each tab comprises a first plate section and a second plate section which are connected with each other, the first plate section is electrically connected with the battery cell, the second plate section is electrically connected with the protection plate, at least part of the second plate section is overlapped with the protection plate, the width of the second plate section is smaller than that of the first plate section, and the width of the second plate section is smaller than that of the first plate section. And the through-flow area of the second plate section is greater than or equal to that of the first plate section. According to the scheme, the problem that the current battery module cannot give consideration to both small size and relatively high output power can be solved.

Description

Technical Field

[0001] The present application belongs to the technical field of power supply equipment, and specifically relates to a battery module. Background Art

[0002] With the development of fast-charging battery technology, high-power battery modules have become the basic configuration of electronic devices. In practical applications, in order to achieve high-power output, it is necessary to increase the width of the battery module's tabs to adapt to high current.

[0003] However, when the width of the pole tab increases, the connector on the protection plate welded to the pole tab also needs to be widened accordingly, which causes the connector to greatly occupy the layout space of the protection plate. However, due to the limitations of the length and width of the protection plate, the components cannot be placed on the same surface as the connector and can only be placed on different surfaces, which causes the head of the battery module to be thicker; alternatively, the pole tab is cut so that the components and the connector are placed on the same surface to ensure that the head of the battery module is thinner, but this will cause the current carrying capacity of the pole tab to be reduced, thereby reducing the output power of the battery module. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a battery module that can solve the problem that current battery modules cannot have both small size and high output power.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The embodiment of the present application provides a battery module, including a battery cell and a protection plate, wherein the battery cell has at least two tabs;

[0007] Wherein, each of the pole ears includes a first plate segment and a second plate segment that are connected, the first plate segment is electrically connected to the battery cell, the second plate segment is electrically connected to the protective plate, at least part of the second plate segment is overlapped with the protective plate, the width of the second plate segment is smaller than the width of the first plate segment, and the flow area of ​​the second plate segment is greater than or equal to the flow area of ​​the first plate segment.

[0008] In the embodiment of the present application, since the width of the second plate segment is smaller than the width of the first plate segment, the space occupied by the tabs on the protective plate for arranging components can be reduced, so that the connectors on the protective plate are placed on the same surface as the components, thereby reducing the head thickness of the battery module; and the flow area of ​​the second plate segment is greater than or equal to the flow area of ​​the first plate segment, so as to ensure that the tabs have a larger flow capacity, thereby enabling the battery module to have a larger output power. Therefore, the embodiment of the present application can solve the problem that the current battery module cannot take into account both small size and large output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1An exploded view of a battery module disclosed in an embodiment of the present application;

[0010] Figure 2 A schematic diagram of the structure of a battery module disclosed in an embodiment of the present application;

[0011] Figure 3 A schematic diagram of the structure of the battery module in an assembled state disclosed in an embodiment of the present application;

[0012] Figure 4 A side view of a battery module disclosed in an embodiment of the present application;

[0013] Figure 5 A side view of a battery module disclosed in another embodiment of the present application.

[0014] Description of reference numerals:

[0015] 100-battery cells;

[0016] 200-ear, 210-first plate segment, 220-second plate segment, 221-first sub-plate segment, 222-second sub-plate segment, 223-ear body, 224-nickel sheet;

[0017] 300-protection board, 310-main board, 320-connector;

[0018] 400-ear glue. DETAILED DESCRIPTION

[0019] 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 described embodiments are 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0021] The battery module provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0022] like Figures 1 to 5 As shown, an embodiment of the present application provides a battery module. Optionally, the battery module can be a lithium iron phosphate battery module, a lithium nickel oxide battery module, a lithium manganese oxide battery module, a lithium cobalt oxide battery module, etc., and the embodiment of the present application does not impose specific restrictions on this.

[0023] The battery module includes a battery cell 100 and a protection plate 300. The battery cell 100 is a unit for storing electrical energy, which converts chemical energy into electrical energy through chemical reactions. The battery cell 100 has at least two tabs 200, which are used for the internal and external connections of the battery module so that the current in the battery cell 100 is led out through the tabs 200 to generate a circuit. The at least two tabs 200 include a positive pole tab and a negative pole tab that are arranged at intervals. Optionally, the number of at least one of the positive pole tab and the negative pole tab can be at least two to improve the current transmission efficiency, thereby improving the charging performance of the battery module. The protection plate 300 can play the role of overcharge protection, discharge protection, overcurrent protection and short circuit protection, so as to prevent the battery cell 100 from being burned out and extend the service life of the battery module.

[0024] Each of the tabs 200 includes a first plate segment 210 and a second plate segment 220 connected to each other. The first plate segment 210 is electrically connected to the battery cell 100, and the second plate segment 220 is electrically connected to the protection plate 300. At least a portion of the second plate segment 220 overlaps with the protection plate 300 to increase the connection area between the two and improve the connection stability between the tab 200 and the protection plate 300. The width of the second plate segment 220 is smaller than the width of the first plate segment 210, and the flow area of ​​the second plate segment 220 is greater than or equal to the flow area of ​​the first plate segment 210, that is, the cross-sectional area of ​​the second plate segment 220 is greater than or equal to the cross-sectional area of ​​the first plate segment 210. Optionally, when the cross-sectional area of ​​the second plate segment 220 is greater than or equal to the cross-sectional area of ​​the first plate segment 210, and the width of the second plate segment 220 is smaller than the width of the first plate segment 210, the thickness of the second plate segment 220 may be greater than the thickness of the first plate segment 210. It should be noted that the above cross-sectional area specifically refers to the cross-sectional area of ​​the second plate segment 220 and the cross-sectional area of ​​the first plate segment 210 in the cross section parallel to the thickness direction of the battery cell 100. Optionally, during the assembly of the battery module, the tab 200 can be cut according to actual needs so that the width of the second plate segment 220 is smaller than the width of the first plate segment 210.

[0025] In the embodiment of the present application, since the width of the second plate segment 220 is smaller than the width of the first plate segment 210, the space occupied by the tab 200 on the protective plate 300 can be reduced, so that the connector on the protective plate 300 is placed on the same surface as the components, thereby reducing the head thickness of the battery module; and the flow area of ​​the second plate segment 220 is larger than the flow area of ​​the first plate segment 210, so as to ensure that the tab 200 has a larger flow capacity, thereby enabling the battery module to have a larger output power. Therefore, the embodiment of the present application can solve the problem that the current battery module cannot take into account both small size and large output power.

[0026] Optionally, in the process of manufacturing the pole tab 200, the pole tab 200 can be made to have a stepped structure in the thickness direction thereof; or, in other embodiments, the second plate segment 220 includes a first sub-plate segment 221 and a second sub-plate segment 222 connected to each other, the first sub-plate segment 221 is electrically connected to the first plate segment 210, the second sub-plate segment 222 is electrically connected to the protection plate 300, and the first sub-plate segment 221, the second sub-plate segment 222 and the protection plate 300 are sequentially stacked and welded. Specifically, in the process of assembling the battery module, the second sub-plate segment 222 can be bent relative to the first sub-plate segment 221 so that the second sub-plate segment 222 is opposite to the first sub-plate segment 221, and then the first sub-plate segment 221 and the second sub-plate segment 222 are welded and melted so that the two are integrated, thereby increasing the thickness of the second plate segment 220 to ensure that the second plate segment 220 has a larger flow area and ensures that the width of the second plate segment 220 is narrow. In this solution, since the first sub-plate segment 221 and the second sub-plate segment 222 are made of the same material, the two can be fully melted, which is beneficial to improving the current transmission performance of the tab 200.

[0027] In an optional embodiment, in the direction perpendicular to the second sub-plate segment 222, the orthographic projection of the second sub-plate segment 222 coincides with the orthographic projection of the first sub-plate segment 221, that is, the length and width of the two are equal, and the connection area after the two are welded is large, which is conducive to improving the connection stability between the tab 200 and the protection plate 300; and the efficiency of the tab 200 in transmitting current can be further improved. Of course, in the direction perpendicular to the second sub-plate segment 222, the orthographic projection of the second sub-plate segment 222 can also be smaller than the orthographic projection of the first sub-plate segment 221, which can be selected according to actual needs, and the embodiment of the present application does not impose specific restrictions on this.

[0028] In another optional embodiment, the second plate segment 220 includes a stacked tab body 223 and a nickel sheet 224, and the nickel sheet 224 is welded between the tab body 223 and the protective plate 300. In the process of assembling the battery module, the thickness of the second plate segment 220 of the tab 200 is increased by adding an additional nickel sheet 224, thereby ensuring that the flow area of ​​the second plate segment 220 is larger, and correspondingly ensuring that the tab 200 has a larger flow capacity, so that the battery module has a larger output power; in addition, the nickel sheet 224 has a larger welding strength during the welding process, which is conducive to its full fusion with the tab body 223 and the protective plate 300, thereby improving the current transmission efficiency. Of course, the nickel sheet 224 can also be replaced by an aluminum sheet or other structure, and there is no specific limitation here.

[0029] In a further optional embodiment, the protection plate 300 includes a stacked main board 310 and a connector 320. Optionally, the connector 320 can be a nickel connector, which has a relatively large welding strength, which is conducive to its full fusion with the nickel sheet 224, thereby improving the current transmission efficiency. The connector 320 is welded between the main board 310 and the nickel sheet 224. In the direction perpendicular to the second plate segment 220, the orthographic projection of the nickel sheet 224 coincides with the orthographic projection of the connector 320 to increase the connection area between the two, thereby making the connection stability between the tab 200 and the protection plate 300 better; and the efficiency of the tab 200 in transmitting current can be improved. Of course, in the direction perpendicular to the second plate segment 220, the orthographic projection of the nickel sheet 224 can be smaller than the orthographic projection of the connector 320.

[0030] Optionally, the width of the nickel sheet 224 can be smaller than or larger than the width of the pole tab body 223; or, in other embodiments, the width of the nickel sheet 224 is equal to the width of the pole tab body 223. When the nickel sheet 224 is welded to the pole tab body 223, the thickness of the second plate segment 220 is basically the same at all locations, so that the second plate segment 220 is fully welded to the protective plate 300, thereby improving the stability of the current transmitted by the second plate segment 220.

[0031] Optionally, the thickness of the nickel sheet 224 can be greater than or equal to the thickness of the tab body 223 to increase the cross-sectional area of ​​the second plate segment 220 and ensure that the tab 200 has a larger flow area and a larger flow capacity. Of course, the thickness of the nickel sheet 224 can also be less than the thickness of the tab body 223.

[0032] Optionally, the thickness of the nickel sheet 224 may be 0.09-0.11 mm, which may be selected according to actual needs, and the embodiment of the present application does not impose any specific limitation thereto. Further, optionally, the thickness of the nickel sheet 224 may be 0.1 mm.

[0033] Optionally, the length of the nickel sheet 224 can be less than or equal to the length of the pole lug body 223. When the length of the nickel sheet 224 is less than the length of the pole lug body 223, interference between the protective plate 300 and the first plate segment 210 can be avoided, so as to facilitate the connection between the pole lug 200 and the protective plate 300; when the length of the nickel sheet 224 is equal to the length of the pole lug body 223, the second plate segment 220 of the pole lug 200 can be fully connected to the protective plate 300, thereby improving the connection stability between the two.

[0034] In an optional embodiment, the ratio of the width of the first plate segment 210 to the width of the second plate segment 220 is 1.1 to 1.2, which can reduce the width of the tab 200 and ensure that the tab 200 has a greater structural strength so that the tab 200 is stably connected to the protective plate 300. Of course, the ratio of the width of the first plate segment 210 to the width of the second plate segment 220 can also be greater than 1.2, or less than 1.1 and greater than 1.

[0035] In another optional embodiment, in a direction perpendicular to the first plate segment 210, the orthographic projection of the first plate segment 210 and the orthographic projection of the protection plate 300 at least partially overlap, and at this time, without affecting the arrangement of components, the edge of the protection plate 300 can be used to accommodate the first plate segment 210 of the tab 200, thereby further reducing the head thickness of the battery module. Of course, the first plate segment 210 and the protection plate 300 can also be staggered.

[0036] In a further optional embodiment, the width of the first plate segment 210 gradually decreases in the extension direction of the first plate segment 210 to the second plate segment 220, that is, the first plate segment 210 has a tapered structure, which can ensure the connection area between the tab 200 and the battery cell 100 and reduce the space occupied by the first plate segment 210 on the protective plate 300. Alternatively, in other embodiments, the width of the first plate segment 210 remains unchanged, which facilitates the production of the tab 200.

[0037] In an optional embodiment, the central axis of the first plate segment 210 is colinear with the central axis of the second plate segment 220. Specifically, the two side edges of the second plate segment 220 can be cut so that the width of the second plate segment 220 is smaller than the width of the first plate segment 210. In this case, the structural strength of the two side edges of the first plate segment 210 is relatively uniform, which is conducive to improving the connection stability of the tab 200. Of course, the central axis of the first plate segment 210 and the central axis of the second plate segment 220 can be staggered. In this case, only one side edge of the second plate segment 220 can be cut, thereby reducing the cutting process and improving the efficiency of assembling the battery module. It should be noted that when cutting the edge of the second plate segment 220, the edge of the connector 320 of the protective plate 300 needs to be cut accordingly so that the second plate segment 220 and the connector 320 are compatible for welding.

[0038] Optionally, when cutting the two side edges of the second plate segment 220, any one side edge can be cut by 0.5-1 mm, which can of course be adjusted according to actual needs, and the embodiment of the present application does not impose specific restrictions on this. Optionally, the cutting amount of the two side edges of the second plate segment 220 can be equal or approximately equal.

[0039] Optionally, based on the pole lug 200 disclosed in the present application, when the number of pole lugs 200 is at least two, the layout space on the entire protective plate 300 can be optimized by N*(1~2)mm, so that the overall size of the protective plate 300 can be greatly shortened, thereby reducing the production cost of the battery module.

[0040] Optionally, the pole tab 200 is a central axis symmetrical structure. In this case, during the current transmission process, the current path length at each location of the pole tab 200 is relatively uniform in the width direction of the pole tab 200 , which is beneficial to improving the stability of the current transmission of the pole tab 200 .

[0041] In an optional embodiment, the battery module further includes a tab glue 400, which is disposed at the connection between the tab 200 and the battery cell 100, to prevent a short circuit between the tab 200 and the aluminum-plastic film of the battery module during packaging, and to heat the tab glue 400 and the aluminum-plastic film to thermally seal and bond them together during packaging to prevent leakage. Optionally, the tab glue 400 wraps at least a portion of the first plate segment 210 of the tab 200 to improve the sealing of the tab glue 400.

[0042] Optionally, the tab 200 may be an aluminum structure, a nickel structure, or a copper-plated nickel structure, which is not specifically limited in the embodiment of the present application.

[0043] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A battery module, characterized in that: It comprises a battery cell (100) and a protection plate (300), wherein the battery cell (100) has at least two tabs (200); Wherein, each of the pole lugs (200) comprises a first plate segment (210) and a second plate segment (220) which are connected to each other, the first plate segment (210) is electrically connected to the battery cell (100), the second plate segment (220) is electrically connected to the protection plate (300), at least a portion of the second plate segment (220) is overlapped with the protection plate (300), the width of the second plate segment (220) is smaller than the width of the first plate segment (210), and the flow area of ​​the second plate segment (220) is greater than or equal to the flow area of ​​the first plate segment (210).

2. The battery module according to claim 1, characterized in that: The second plate segment (220) comprises a first sub-plate segment (221) and a second sub-plate segment (222) which are connected to each other; the first sub-plate segment (221) is electrically connected to the first plate segment (210); the second sub-plate segment (222) is electrically connected to the protection plate (300); the first sub-plate segment (221), the second sub-plate segment (222) and the protection plate (300) are sequentially stacked and welded.

3. The battery module according to claim 2, characterized in that: In a direction perpendicular to the second sub-plate segment (222), the orthographic projection of the second sub-plate segment (222) coincides with the orthographic projection of the first sub-plate segment (221).

4. The battery module according to claim 1, characterized in that: The second plate section (220) comprises a stacked tab body (223) and a nickel sheet (224), wherein the nickel sheet (224) is welded between the protection plate (300) and the tab body (223).

5. The battery module according to claim 4, characterized in that: The protection plate (300) comprises a stacked main plate (310) and a connecting piece (320); the connecting piece (320) is fused between the main plate (310) and the nickel sheet (224); in a direction perpendicular to the second plate segment (220), an orthographic projection of the nickel sheet (224) coincides with an orthographic projection of the connecting piece (320).

6. The battery module according to claim 4, characterized in that: The width of the nickel sheet (224) is equal to the width of the tab body (223); The thickness of the nickel sheet (224) is greater than or equal to the thickness of the tab body (223).

7. The battery module according to claim 1, characterized in that: The ratio of the width of the first plate section (210) to the width of the second plate section (220) is 1.1-1.

2.

8. The battery module according to claim 1, characterized in that: In a direction perpendicular to the first plate segment (210), an orthographic projection of the first plate segment (210) at least partially overlaps with an orthographic projection of the protection plate (300).

9. The battery module according to claim 8, characterized in that: In the extension direction of the first plate segment (210) toward the second plate segment (220), the width of the first plate segment (210) gradually decreases; or, The width of the first plate section (210) remains unchanged.

10. The battery module according to claim 1, characterized in that: The central axis of the first plate segment (210) and the central axis of the second plate segment (220) are collinear.

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