Busbar and battery module

Abstract

The utility model provides a busbar and a battery module, and relates to the technical field of batteries. The busbar comprises a bus bar and a plurality of diversion pieces arranged at intervals, each diversion piece comprises a fusing part and a diversion part, the melting point of the fusing part is lower than that of the bus bar and that of the diversion part, the two ends of the fusing part are connected with the diversion part and the bus bar respectively, and the diversion part is used for being connected with the positive electrode or the negative electrode of the battery cell. According to the invention, the fusing part is arranged between the bus bar and the diversion part, so that the current converged by the bus bar does not flow through the fusing part, the fusing part can meet the fusing requirement of the bus bar, the magnitude of the current borne by the bus bar is not affected, the overcurrent capability of the bus bar can be improved, and the service life of the bus bar is prolonged. The internal resistance of the battery module is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a bus and a battery module. Background Art

[0002] In the related technologies, as the application of power batteries becomes more and more extensive, their safety issues have received more and more attention. Battery short circuit is an important factor causing safety issues. At present, the design requirements of battery short circuit protection are mainly met by designing a fuse structure on the busbar, so that when the battery is short-circuited or the temperature is abnormal, the fuse structure is melted, thereby disconnecting the battery circuit.

[0003] Usually, there are multiple busbars, and multiple busbars connect multiple battery cells in series in sequence, that is, one side of the busbar is a positive electrode guide part electrically connected to the positive electrode of one battery cell, and the other side is a negative electrode guide part electrically connected to the negative electrode of another battery cell, so as to connect adjacent battery cells in series. The fuse structure is arranged between the positive electrode guide part and the negative electrode guide part. Although this meets the fuse requirement of the busbar, it will reduce the current capacity of the busbar, thereby increasing the internal resistance of the battery module. Utility Model Content

[0004] The embodiments of the present application provide a bus and a battery module, which can improve the current carrying capacity of the bus.

[0005] In the first aspect, an embodiment of the present application provides a busbar, which includes a busbar and a plurality of spaced-apart current guides, the current guides including a fuse part and a current guide part, the melting point of the fuse part is lower than the melting points of the busbar and the current guide part, the two ends of the fuse part are respectively connected to the current guide part and the busbar, and the current guide part is used to connect to the positive or negative electrode of the battery cell.

[0006] In one embodiment, the fuse portion is extended from the bus bar toward the guide portion, and an extending direction of the fuse portion forms an acute angle or an obtuse angle with an extending direction of the bus bar.

[0007] In one embodiment, the cross-sectional area of ​​the fuse portion perpendicular to the current transmission direction is smaller than the cross-sectional area of ​​the guide portion perpendicular to the current transmission direction and the cross-sectional area of ​​the bus bar perpendicular to the current transmission direction.

[0008] In one embodiment, a fuse hole or a fuse groove is provided on the fuse portion.

[0009] In one embodiment, the fuse hole is in a strip shape, and an extension direction of a hole wall of the fuse hole is consistent with an extension direction of the fuse portion.

[0010] In one embodiment, the fuse slot is strip-shaped, and an extension direction of a slot wall of the fuse slot is consistent with an extension direction of the fuse portion.

[0011] In one embodiment, the fuse portion is an arc-shaped structure, and two ends of the arc-shaped structure are respectively connected to the guide portion and the bus bar.

[0012] In one embodiment, the cross-sectional area of ​​the bus bar perpendicular to the current transmission direction is greater than the cross-sectional area of ​​the guide perpendicular to the current transmission direction.

[0013] In one embodiment, the thickness of the bus bar is greater than the thickness of the guide.

[0014] In one embodiment, along the thickness direction of the bus bar, the bus bar includes a first bar body and a second bar body stacked in sequence, the second bar body and the guide are integrally formed, and the thickness of the second bar body is consistent with the thickness of the guide.

[0015] In one embodiment, the resistivity of the first strip is lower than the resistivity of the second strip.

[0016] In one embodiment, the busbar is applied to a battery module, the battery module includes a battery cell, the battery cell has a pole, and the guide portion is provided with a first through hole, and the first through hole is configured to be aligned with the pole.

[0017] In a second aspect, an embodiment of the present application provides a battery module, which includes the aforementioned bus bar.

[0018] Beneficial effects of the embodiments of the present application:

[0019] In an embodiment of the present application, the fuse part is arranged between the bus bar and the guide part so that the current gathered by the bus does not flow through the fuse part. Thus, the fuse part can meet the fusing requirement of the bus without affecting the current that the bus can carry, thereby improving the current carrying capacity of the bus and reducing the internal resistance of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0021] Figure 1 is a schematic diagram of the structure of a bus provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of a partial structure of a bus provided in an embodiment of the present application;

[0023] Figure 3 yes Figure 1 The enlarged view of point A in the middle;

[0024] Figure 4 An exploded view of a bus bar provided in an embodiment of the present application.

[0025] Description of reference numerals:

[0026] 001-bus;

[0027] 011-flow guide, 111-flow guide portion, 1111-first through hole, 112-fuse portion, 1121-fuse hole;

[0028] 012 - bus bar, 121 - first bar body, 122 - second bar body, 123 - positioning hole, 124 - second through hole. DETAILED DESCRIPTION

[0029] 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 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 creative work are within the scope of protection of this application.

[0030] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0034] See also Figure 1 , Figure 1 : is a schematic diagram of the structure of the busbar 001 provided in the embodiment of the present application. The embodiment of the present application provides a busbar 001. The busbar 001 includes a busbar 012 and a plurality of guide members 011 arranged at intervals. The guide member 011 includes a fuse part 112 and a guide part 111. The melting point of the fuse part 112 is lower than the melting points of the busbar 012 and the guide part 111. The two ends of the fuse part 112 are respectively connected to the guide part 111 and the busbar 012. The guide part 111 is used to connect to the positive or negative electrode of the battery cell.

[0035] It can be understood that multiple guides 011 are arranged at intervals along the length direction of the busbar 012. Multiple guides 111 connected to the same busbar 012 are connected to the same electrode of multiple battery cells, thereby connecting the positive or negative electrodes of multiple battery cells in parallel. Accordingly, the battery module is configured with at least two busbars, one busbar connects the positive electrodes of multiple battery cells in parallel, and the other busbar connects the negative electrodes of multiple battery cells in parallel. Among them, the busbar 001 disclosed in this embodiment can be used only at the positive electrode of the battery cell, and the busbar connected to the negative electrode of the battery cell can use a conventional busbar.

[0036] Exemplarily, the melting point of the fuse 112 is less than 1000° C., and the melting points of the busbar 012 and the guide 111 are greater than 1000° C. When the current abnormally rises to a certain temperature, the fuse 112 melts itself to cut off the current, thereby disconnecting the battery circuit.

[0037] There are multiple ways to preferentially fuse the fuse part 112 relative to the busbar 012 and the guide part 111. For example, in the first way, the fuse part 112 can be formed with a material having a melting point lower than the melting point of the material of the busbar 012 and the melting point of the material of the guide part 111, so as to preferentially fuse the fuse part 112. For another example, in the second way, the cross-sectional area of ​​the fuse part 112 perpendicular to the current transmission direction can also be set to a structure that is smaller than the cross-sectional area of ​​the guide part 111 perpendicular to the current transmission direction and the cross-sectional area of ​​the busbar 012 perpendicular to the current transmission direction, so as to preferentially fuse the fuse part 112.

[0038] In this embodiment, the fuse part 112 is arranged between the bus bar 012 and the guide part 111, so that the current gathered by the bus 001 does not pass through the fuse part 112. Therefore, the fuse part 112 can meet the fusing requirement of the bus 001 without affecting the current that the bus 001 can carry, thereby improving the current carrying capacity of the bus 001 and reducing the internal resistance of the battery module.

[0039] See also Figure 2 , Figure 2 1 is a partial structural diagram of a busbar 001 provided in an embodiment of the present application. In one embodiment, the fuse portion 112 is extended from the busbar 012 to the guide portion 111, and the extension direction of the fuse portion 112 forms an acute angle or an obtuse angle with the extension direction of the busbar 012, so that the two ends of the fuse portion 112 are staggered along the length direction of the busbar 012.

[0040] In this embodiment, the extension direction of the fuse part 112 is set at an acute angle or an obtuse angle with the extension direction of the busbar 012, so that the two ends of the fuse part 112 are staggered along the length direction of the busbar 012. In this way, when the spacing between the guide part 111 and the busbar 012 is limited, the size of the fuse part 112 in the length direction of the busbar 012 can be increased, thereby making the size of the fuse part 112 meet the fuse requirements, and finally improving the reliability of the busbar 001.

[0041] In one embodiment, the second method is adopted to achieve the priority fusing of the fuse part 112. Specifically, the cross-sectional area of ​​the fuse part 112 perpendicular to the current transmission direction is smaller than the cross-sectional area of ​​the guide part 111 perpendicular to the current transmission direction and the cross-sectional area of ​​the busbar 012 perpendicular to the current transmission direction.

[0042] Exemplarily, the fuse portion 112 and the guide portion 111 are integrally formed.

[0043] In this embodiment, the preferential fusing of the fuse part 112 is achieved by limiting the size relationship of the cross-sectional areas of the current passing between the various components, so that the fuse part 112 and the guide part 111 can be formed of the same material, so that the fuse part 112 can be integrally formed with the guide part 111, thereby improving the molding efficiency of the guide part 011 and reducing the manufacturing difficulty of the bus 001.

[0044] In one embodiment, a fuse hole 1121 or a fuse slot is disposed on the fuse portion 112 .

[0045] In this embodiment, by providing a fuse hole 1121 or a fuse groove on the fuse part 112, on the one hand, the cross-sectional area of ​​the fuse part 112 perpendicular to the current transmission direction can be made smaller through the setting of the fuse hole 1121 or the fuse groove, and on the other hand, the fuse part 112 has a larger surface area, thereby improving the fusing reliability of the fuse part 112.

[0046] Specifically, when the fuse hole 1121 is provided on the fuse part 112, Figure 2 As shown, the fuse hole 1121 is a waisted hole in a strip shape, and the extension direction of the hole wall of the fuse hole 1121 is consistent with the extension direction of the fuse part 112. When a fuse slot is provided on the fuse part 112, the fuse slot is in a strip shape, and the extension direction of the slot wall of the fuse slot is consistent with the extension direction of the fuse part 112. In this way, the length of the structure for fusing of the fuse part 112 can be increased, so that fusing at any position of the hole wall of the fuse hole 1121 or any position of the slot wall of the fuse slot can meet the fusing requirements, thereby improving the fusing reliability of the fuse part 112.

[0047] See also Figure 2 In one embodiment, the fuse portion 112 is an arc-shaped structure, and two ends of the arc-shaped structure are respectively connected to the guide portion 111 and the bus bar 012.

[0048] In this embodiment, through the above arrangement, when the distance between the two ends of the fuse part 112 is constant, the fuse part 112 can have a longer size, thereby further improving the reliability of the busbar 001.

[0049] See also Figure 1 In one embodiment, the cross-sectional area of ​​the bus bar 012 perpendicular to the current transmission direction is greater than the cross-sectional area of ​​the guide member 011 perpendicular to the current transmission direction.

[0050] It can be understood that the current passing through busbar 012 is greater than the current passing through guide member 011. Therefore, in order to meet the overcurrent requirement of busbar 012, it is necessary to set the cross-sectional area of ​​busbar 012 perpendicular to the current transmission direction to a structure larger than the cross-sectional area of ​​guide member 011 perpendicular to the current transmission direction, so as to improve the reliability of busbar 001.

[0051] Exemplarily, 13 flow guides 011 are provided on one side of the bus bar 012 .

[0052] In combination with the above-mentioned embodiment, the bending directions of the fuse portions 112 of each guide member 011 may be consistent, or part of them may be consistent and the other part may be opposite, such as Figure 1 The specific bending direction of the fuse portion 112 can be set accordingly according to different battery modules.

[0053] See also Figure 3 , Figure 3 yes Figure 1 An enlarged view of point A in the middle. In one embodiment, the thickness of the bus bar 012 is greater than the thickness of the guide member 011 .

[0054] Exemplarily, the thickness of the busbar 012 is 2 to 2.6 mm, and the thickness of the guide 011 is 0.2 to 0.4 mm. It is understood that the thickness of the busbar 012 includes but is not limited to 2 mm, 2.1 mm, 2.2 mm, 2.4 mm, 2.5 mm, and 2.6 mm. The thickness of the guide 011 includes but is not limited to 0.2 mm, 0.21 mm, 0.22 mm, 0.3 mm, 0.35 mm, and 0.4 mm.

[0055] In this embodiment, the thickness of the busbar 012 is increased to achieve a larger cross-sectional area of ​​the busbar 012 perpendicular to the current transmission direction, which can reduce the surface area occupied by the busbar 012 in the battery module, thereby reducing the difficulty of arranging the busbar 001 and improving the installation efficiency of the busbar 001.

[0056] In one embodiment, the bus bar 012 and the flow guide 011 are integrally formed.

[0057] In this embodiment, through the above configuration, the reliability of the connection between the bus bar 012 and the guide member 011 can be improved, thereby improving the reliability of the busbar 001.

[0058] See also Figure 4 , Figure 4 An exploded view of a busbar 001 provided in an embodiment of the present application. In one embodiment, along the thickness direction of the busbar 012, the busbar 012 includes a first bar body 121 and a second bar body 122 stacked in sequence, the second bar body 122 is integrally formed with the guide member 011, and the thickness of the second bar body 122 is consistent with the thickness of the guide member 011.

[0059] It can be understood that when the bus bar 012 and the guide member 011 are integrally formed, the thickness difference between the bus bar 012 and the guide member 011 makes the forming difficult. Based on this, in this embodiment, the bus bar 012 is configured as a structure composed of a first bar body 121 and a second bar body 122, and the thickness of the second bar body 122 is consistent with the thickness of the guide member 011, so that the first bar body 121 and the combination of the second bar body 122 and the guide member 011 with the same overall thickness are formed respectively, thereby reducing the forming difficulty of the bus bar 001.

[0060] Furthermore, the first strip body 121 is welded with the second strip body 122. Specifically, the first strip body 121 and the second strip body 122 are combined into one by laser welding.

[0061] In one embodiment, the melting point of the first strip 121 is greater than the melting point of the guide member 011 .

[0062] Specifically, the material of the first strip body 121 may be copper, and the material of the second strip body 122 may be aluminum.

[0063] It can be understood that the second strip 122 and the guide member 011 are integrally formed, and therefore the second strip 122 and the guide member 011 are made of the same material. Accordingly, the melting point of the first strip 121 is also greater than the melting point of the guide member 011.

[0064] In this embodiment, through the above configuration, the overcurrent reliability of the bus bar 012 can be improved, and the bus bar 012 can be prevented from being blown, thereby improving the reliability of the bus bar 001.

[0065] In one embodiment, the resistivity of the first strip 121 is lower than the resistivity of the second strip 122 .

[0066] It can be understood that the resistance of the first strip 121 is lower than the resistance of the second strip 122 .

[0067] Specifically, the material of the first strip body 121 may be copper, and the material of the second strip body 122 may be aluminum.

[0068] In this embodiment, through the above configuration, the flow conducting capacity of the busbar 001 can be improved and the material cost of the busbar 001 can be controlled.

[0069] In one embodiment, the busbar 001 is applied to a battery module, the battery module includes a battery cell, the battery cell has a pole, and the guide portion 111 is provided with a first through hole 1111, and the first through hole 1111 is configured to be aligned with the pole.

[0070] It can be understood that a reference ring is provided on the end face of the pole, and the reference ring is provided coaxially with the pole. When the first through hole 1111 can show a complete reference ring, it can be determined that the guide portion 111 is aligned with the pole.

[0071] In this embodiment, by providing the first through hole 1111 , it is convenient for relevant staff to quickly determine whether the bus 001 is installed in place, thereby improving the convenience of assembling the bus 001 .

[0072] Regarding the installation of the busbar 001 provided in the embodiment of the present application, the following method can be adopted: a positioning hole 123 and a second through hole 124 are provided on the busbar 012. The positioning hole 123 is used to cooperate with the positioning column on the insulating bracket of the battery module. The second through hole 124 cooperates with the screw. The end of the rod of the screw passes through the second through hole 124 and is threadedly connected with the insulating bracket, thereby fixing the busbar 001 on the insulating bracket. Then, the guide part 111 is fixed to the electrode end of the battery, such as the positive electrode, by laser welding.

[0073] Correspondingly, an embodiment of the present application further provides a battery module, which includes the aforementioned busbar.

[0074] It can be understood that the battery module also includes a battery cell, a battery cell bracket, etc. The battery cell is installed on the battery cell bracket, the collection bracket is fixed to the end of the battery cell, and the busbar is arranged on the collection bracket and is electrically connected to the electrode of the battery cell.

[0075] In this embodiment, by adopting the aforementioned busbar, the size of the fuse part 112 in the length direction of the busbar 012 can be increased when the distance between the guide part 111 and the busbar 012 is limited, so that the size of the fuse part 112 meets the fusing requirements, and finally the reliability of the battery module can be improved.

[0076] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A busbar, characterized in that: include: Busbars; A plurality of flow guides are arranged at intervals, wherein the flow guides include a fuse part and a flow guide part, the melting point of the fuse part is lower than the melting points of the bus bar and the flow guide part, the two ends of the fuse part are respectively connected to the flow guide part and the bus bar, and the flow guide part is used to be connected to the positive or negative electrode of the battery cell.

2. The busbar according to claim 1, characterized in that: The fuse portion is extended from the bus bar toward the guide portion, and an extending direction of the fuse portion forms an acute angle or an obtuse angle with an extending direction of the bus bar.

3. The busbar according to claim 1, characterized in that: The cross-sectional area of ​​the fuse portion perpendicular to the current transmission direction is smaller than the cross-sectional area of ​​the guide portion perpendicular to the current transmission direction and the cross-sectional area of ​​the bus bar perpendicular to the current transmission direction.

4. The busbar according to claim 3, characterized in that: The fuse part is provided with a fuse hole or a fuse groove.

5. The busbar according to claim 4, characterized in that: The fuse hole is in a strip shape, and an extension direction of a hole wall of the fuse hole is consistent with an extension direction of the fuse portion.

6. The busbar according to claim 4, characterized in that: The fuse slot is strip-shaped, and the extension direction of the slot wall of the fuse slot is consistent with the extension direction of the fuse portion.

7. The busbar according to any one of claims 1 to 6, characterized in that: The fuse part is an arc-shaped structure, and two ends of the arc-shaped structure are respectively connected to the guide part and the bus bar.

8. The busbar according to any one of claims 1 to 6, characterized in that: A cross-sectional area of ​​the bus bar perpendicular to the current transmission direction is greater than a cross-sectional area of ​​the current guide perpendicular to the current transmission direction.

9. The busbar according to claim 8, characterized in that: The bus bar has a thickness greater than that of the guide.

10. The busbar according to claim 9, characterized in that: Along the thickness direction of the bus bar, the bus bar includes a first bar body and a second bar body stacked in sequence, the second bar body and the guide member are integrally formed, and the thickness of the second bar body is consistent with the thickness of the guide member.

11. The busbar according to claim 10, characterized in that: The resistivity of the first strip is lower than the resistivity of the second strip.

12. The busbar according to any one of claims 1 to 6, characterized in that: The busbar is applied to a battery module, wherein the battery module includes a battery cell having a pole, and the guide portion is provided with a first through hole, wherein the first through hole is configured to be aligned with the pole.

13. A battery module, characterized in that: Comprising the busbar as claimed in any one of claims 1 to 12.

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