Busbar, battery and electric device

Abstract

The utility model relates to a busbar, a battery and an electric device. The busbar comprises a connecting piece which comprises a first connecting part and a second connecting part which are in conductive connection; the first hardware and the second hardware are arranged on the same side of the connecting piece in the thickness direction of the connecting piece, the first hardware and the first connecting part are stacked and conductively connected, and the second hardware and the second connecting part are stacked and conductively connected. According to the busbar, the battery and the electric device provided by the invention, the welding reliability can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a busbar, a battery, and an electrical device. Background Technology

[0002] In recent years, the new energy industry has received increasing attention, and batteries, as an important component of this industry, occupy a large market share. A battery is formed by connecting multiple individual cells in series or parallel.

[0003] A battery consists of multiple battery modules, which need to be connected and soldered together using busbars when connected in series or parallel. However, in the actual soldering process, busbars are prone to defects such as weld spatter and delamination, affecting the reliability of the soldering. Utility Model Content

[0004] Therefore, it is necessary to provide a bus, battery, and power supply device that can improve the reliability of welding in order to address the above problems.

[0005] A bus, the bus comprising:

[0006] A connector, comprising a first connecting portion and a second connecting portion that are electrically connected;

[0007] The first and second hardware components are disposed on the same side of the connector along the thickness direction of the connector, and the first hardware component is superimposed on and electrically connected to the first connecting portion, and the second hardware component is superimposed on and electrically connected to the second connecting portion.

[0008] In some embodiments, the hardness of the connector is A1, 0 < A1 ≤ 20HB; and / or, the hardness of the first and second hardware components is A2, 60HB ≤ A2 ≤ 120HB.

[0009] In some embodiments, the connector is a soft aluminum component, and both the first and second hardware components are hard aluminum components.

[0010] In some embodiments, a first clearance hole is provided on the first connecting portion, and a second clearance hole is provided on the second connecting portion. The first clearance hole and the second clearance hole are used for the laser used for welding to pass through.

[0011] In the thickness direction of the connector, the orthographic projection of the first clearance hole falls completely within the first hardware component, and the orthographic projection of the second clearance hole falls completely within the second hardware component.

[0012] In some embodiments, the diameters of the first and second clearance holes are both D, where 18mm ≤ D ≤ 25mm.

[0013] In some embodiments, the first hardware is provided with a first laser positioning hole, which is exposed inside the first clearance hole;

[0014] The second hardware has a second laser positioning hole, which is exposed inside the second clearance hole.

[0015] In some embodiments, the thickness of both the first and second hardware components is H, where 0.5mm ≤ H ≤ 3mm.

[0016] In some embodiments, the connector further includes a third connecting portion, which is electrically connected between the first connecting portion and the second connecting portion, and the third connecting portion arches away from the first and second hardware components in the thickness direction of the connector.

[0017] A battery, the battery comprising:

[0018] Bus as described in any of the above embodiments; and

[0019] At least two battery modules, each battery module comprising multiple battery cells;

[0020] In each of the battery modules, each pair of adjacent battery cells is welded to the first hardware and the second hardware of the busbar, and / or, at least two battery cells of two adjacent sets of battery modules are welded to the first hardware and the second hardware.

[0021] An electrical device includes a battery as described in the above embodiments.

[0022] Compared with the prior art, this application has the following beneficial effects:

[0023] The aforementioned busbar, battery, and power supply device, along with the first and second additional hardware components, are essentially hardened. The increased hardness of the welding area of ​​the busbar used for welding battery cells makes it less prone to defects such as weld explosions and delamination when the first and second additional hardware components are welded to two battery cells respectively, thus improving the reliability of the welding. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the busbar in one embodiment of this application;

[0025] Figure 2 for Figure 1 The front view of the bus shown;

[0026] Figure 3 for Figure 1 A top view of the busbar shown;

[0027] Figure 4 for Figure 1 The exploded view of the busbar shown;

[0028] Figure 5 This is an exploded view of a battery in one embodiment of this application;

[0029] Figure 6 for Figure 5 The diagram shows a top view of the battery after the first part has been removed, showing the assembly of all components.

[0030] Icon labels:

[0031] 1000, battery;

[0032] 100. Busbar; 200. Battery module; 300. Integrated busbar; 400. Housing;

[0033] 10. Connector; 20. First additional hardware; 30. Second additional hardware;

[0034] 11. First connecting part; 111. First clearance hole; 12. Second connecting part; 121. Second clearance hole; 13. Third connecting part;

[0035] 21. First laser positioning hole; 22. Second laser positioning hole;

[0036] 201. Battery cell;

[0037] 401. Part One; 402. Part Two. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship 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 of this application.

[0040] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0045] A battery consists of multiple battery modules, which need to be connected and soldered together using busbars when connected in series or parallel. However, in the actual soldering process, busbars are prone to defects such as weld spatter and delamination, affecting the reliability of the soldering.

[0046] Please see Figures 1 to 5 To alleviate the above problems, this application provides a bus 100, which includes a connector 10, a first bonding device 20, and a second bonding device 30. The connector 10 includes a first connecting portion 11 and a second connecting portion 12 that are electrically connected. The first bonding device 20 and the second bonding device 30 are along the thickness direction of the connector 10 (e.g., ...). Figure 2 The direction indicated by arrow Z is set on the same side of connector 10, and the first hardware 20 is stacked and electrically connected to the first connecting part 11, and the second hardware 30 is stacked and electrically connected to the second connecting part 12.

[0047] Specifically, the first hardware component 20, the second hardware component 30, and the connector 10 are all conductive components, and the hardness of the first hardware component 20 and the second hardware component 30 is greater than that of the connector 10. The first hardware component 20 and the second hardware component 30 are disposed on the side of the connector 10 facing the battery module 200. The first hardware component 20 is stacked with the first connecting portion 11, and the second hardware component 30 is stacked with the second connecting portion 12.

[0048] The materials of the first hardware component 20, the second hardware component 30, and the connector 10 can be the same or different. When the materials of the first hardware component 20, the second hardware component 30, and the connector 10 are the same, different molding processes are used to make the hardness of the connector 10 less than that of the first hardware component 20 and the second hardware component 30.

[0049] As an example, the first hardware component 20 and the first connecting part 11, and the second hardware component 30 and the second connecting part 12, can be connected by welding (e.g., polymer diffusion welding or ultrasonic welding). This method is simple and easy to operate, and does not require additional fasteners, thereby simplifying the structure of the busbar 100. Of course, in other embodiments, the first hardware component 20 and the first connecting part 11, and the second hardware component 30 and the second connecting part 12, can also be connected by other fixed connections. In actual operation, the first hardware component 20 and the second hardware component 30 are welded to two battery cells 201 in two adjacent battery modules 200, respectively, to achieve series or parallel connection between the two adjacent battery modules 200.

[0050] In this application, the hardness of the connector 10 is relatively lower than that of the first additional hardware 20 and the second additional hardware 30. Therefore, when the battery 1000 vibrates under actual working conditions, the connector 10 can reduce the risk of stress concentration during vibration, thus reducing the probability of damage to the busbar 100. The addition of the first additional hardware 20 and the second additional hardware 30 is equivalent to hardening treatment, increasing the hardness of the welding area of ​​the busbar 100 used for welding the battery cells 201. This reduces the likelihood of defects such as weld spatter and delamination when the first additional hardware 20 and the second additional hardware 30 are welded to the two battery cells 201 respectively, improving the reliability of the welding.

[0051] In some embodiments, the hardness of the connector 10 is A1, where 0 < A1 ≤ 20 HB; and / or, the hardness of both the first mounting hardware 20 and the second mounting hardware 30 is A2, where 60 HB ≤ A2 ≤ 120 HB. Specifically, A1 is 5 HB, 10 HB, 15 HB, or 20 HB, but is not limited to the listed values; other unlisted values ​​within the range are also applicable. A2 is 60 HB, 70 HB, 180 HB, or 120 HB, but is not limited to the listed values; other unlisted values ​​within the range are also applicable.

[0052] The connector 10 has low hardness, which reduces the risk of stress concentration during vibration and decreases the probability of damage to the busbar 100. The first and second additional hardware components 20 and 30 have high hardness, which reduces the likelihood of defects such as weld explosion and delamination when the first and second additional hardware components 20 and 30 are welded to the two battery cells 201 respectively, thus improving the reliability of the welding.

[0053] In some embodiments, the connector 10 is a soft aluminum component, and the first mounting hardware 20 and the second mounting hardware 30 are both hard aluminum components.

[0054] The soft aluminum component is a flexible structure formed by welding multiple layers of aluminum foil together, while the hard aluminum component is a solid, rigid structure formed by stamping. The connector 10 is made of the same material as the first hardware component 20 and the second hardware component 30, but the forming method is different, which makes the hardness of the connector 10 less than that of the first hardware component 20 and the second hardware component 30.

[0055] The first additional hardware component 20 and the second additional hardware component 30 are made of the same material as the connector 10. The first additional hardware component 20 and the second additional hardware component 30 have good compatibility and high welding quality when welded to the connector 10. Moreover, the first additional hardware component 20, the second additional hardware component 30 and the connector 10 are all made of aluminum, which is relatively inexpensive and helps to reduce the manufacturing cost of the busbar 100.

[0056] Please continue reading. Figure 1 , Figure 3 and Figure 4In some embodiments, a first clearance hole 111 is provided on the first connecting portion 11, and a second clearance hole 121 is provided on the second connecting portion 12. The first clearance hole 111 and the second clearance hole 121 are used for the laser used for welding to pass through. In the thickness direction of the connector 10, the orthographic projection of the first clearance hole 111 falls completely within the first processing hardware 20, and the orthographic projection of the second clearance hole 121 falls completely within the second processing hardware 30.

[0057] The orthographic projection of the first relief hole 111 falls entirely within the first mounting hardware 20, and the orthographic projection of the second relief hole 121 falls entirely within the second mounting hardware 30, so that the first mounting hardware 20 is exposed within the first relief hole 111, and the second mounting hardware 30 is exposed within the second relief hole 121. Therefore, during welding, the laser can pass through the first relief hole 111 to weld the first mounting hardware 20 and the battery cell 201, and can also pass through the second relief hole 121 to weld the second mounting hardware 30 and the battery cell 201. The arrangement of the first relief hole 111 and the second relief hole 121 results in low laser energy loss during the welding of the first mounting hardware 20 and the battery cell 201, and the second mounting hardware 30 and the battery cell 201, thus saving energy and increasing welding efficiency.

[0058] Furthermore, in some embodiments, the diameters of both the first clearance hole 111 and the second clearance hole 121 are D, where 18mm ≤ D ≤ 25mm. Within this diameter range, the sizes of the first clearance hole 111 and the second clearance hole 121 can be matched to the size of the welding head emitting the laser, allowing the laser to almost completely pass through either the first clearance hole 111 or the second clearance hole 121, without significantly affecting the strength of the connector 10.

[0059] In some embodiments, the first mounting hardware 20 has a first laser positioning hole 21, which is exposed within the first clearance hole 111; the second mounting hardware 30 has a second laser positioning hole 22, which is exposed within the second clearance hole 121. The first laser positioning hole 21 is used for laser positioning when welding the first mounting hardware 20 and the battery cell 201, and the second laser positioning hole 22 is used for laser positioning when welding the second mounting hardware 30 and the battery cell 201. When the laser shines on the first laser positioning hole 21, it indicates that the welding head is positioned correctly for welding the first mounting hardware 20 and the battery cell 201, so welding of the first mounting hardware 20 and the battery cell 201 can begin. When the laser shines on the second laser positioning hole 22, it indicates that the welding head is positioned correctly for welding the second mounting hardware 30 and the battery cell 201, so welding of the second mounting hardware 30 and the battery cell 201 can begin. Therefore, the provision of the first laser positioning hole 21 and the second laser positioning hole 22 facilitates precise positioning welding of the welding head.

[0060] Please see Figure 2In some embodiments, the thickness of both the first hardware component 20 and the second hardware component 30 is H, where 0.5mm ≤ H ≤ 3mm. The thickness direction of the first hardware component 20 and the second hardware component 30 is consistent with the thickness direction of the connector 10. Specifically, H is 0.5mm, 1mm, 1.5mm, or 3mm, but is not limited to the listed values; other unlisted values ​​within this range are also applicable. Within this thickness range, the first hardware component 20 and the second hardware component 30 have high hardness, making them less prone to defects such as weld spatter and delamination during welding with the battery cell 201, resulting in high welding quality.

[0061] Please see Figures 1 to 4 In some embodiments, the connector 10 further includes a third connecting portion 13, which is electrically connected between the first connecting portion 11 and the second connecting portion 12, and the third connecting portion 13 arches away from the first mounting hardware 20 and the second mounting hardware 30 in the thickness direction of the connector 10.

[0062] Specifically, the third connecting part 13 is arc-shaped, and the third connecting part 13 is integrally formed with the first connecting part 11 and the second connecting part 12.

[0063] The third connecting part 13 has a certain degree of elasticity. The setting of the third connecting part 13 solves the problem of stress concentration during vibration, reduces the risk of breakage of the connecting part 10, and helps to improve the reliability of the connection.

[0064] Please see Figure 1 , Figure 5 and Figure 6 This application provides a battery 1000, which includes at least two sets of battery modules 200 and a busbar 100 as described in any of the above embodiments. All battery modules 200 are arranged along the width direction of the battery 1000, and each battery module 200 includes a plurality of battery cells 201. All battery cells 201 in the same battery module 200 are arranged along the length direction of the battery 1000. Specifically, every two adjacent battery cells 201 in each battery module 200 are respectively welded to a first mounting hardware 20 and a second mounting hardware 30 of the busbar 100, and / or, at least two battery cells 201 in two adjacent sets of battery modules 200 are respectively welded to the first mounting hardware 20 and the second mounting hardware 30.

[0065] The battery cell 201 includes a terminal post. Whether it is the same battery module 200 or two adjacent battery modules 200, the two terminal posts of the two battery cells 201 are welded to the first and second reinforcing members of the busbar 100 respectively.

[0066] As an example, a busbar 100 and an integrated busbar 300 (commonly known as a CCS module) can be set in the battery 1000. The two terminals of two battery cells 201 in two adjacent battery modules 200 are welded to the first and second reinforcing members of the busbar 100, respectively. The two terminals of each pair of adjacent battery cells 201 in each of the other two adjacent battery modules 200, as well as the two terminals of each pair of adjacent battery cells 201 in the same battery module 200, are welded to the busbar to realize the series or parallel connection between the battery modules 200.

[0067] Of course, in some other embodiments, the two poles of each two connected battery cells 201 in the same battery module 200 can be welded to the first and second reinforcing members of the busbar 100, respectively. Moreover, the two poles of each two adjacent battery cells 201 in each of the two adjacent battery modules 200 can be welded to the first and second reinforcing members of the busbar 100, respectively.

[0068] The battery 1000 in this application has the effects of any of the above embodiments, so it will not be described again here.

[0069] In some embodiments, the battery 1000 further includes a housing 400, which includes a first portion 401 and a second portion 402. The first portion 401 and the second portion 402 enclose a receiving cavity, in which all battery modules 200 and all busbars 100 are disposed, so as to isolate all battery modules 200 and all busbars 100 from external moisture.

[0070] This application also provides an electrical device that includes the battery 1000 described in the above embodiments. The electrical device in this application has the effects of any of the above embodiments, and therefore will not be described again here.

[0071] The electrical devices can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical devices described above.

[0073] The busbar 100, battery 1000 and power supply device, and the first hardware 20 and the second hardware 30 are designed to harden the components. The increased hardness of the welding area of ​​the busbar 100 used for welding the battery cell 201 makes it less likely for defects such as weld explosion and delamination to occur when the first hardware 20 and the second hardware 30 are welded to the two battery cells 201 respectively, thus improving the reliability of the welding.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A busbar, characterized in that, The bus includes: The connector (10) includes a first connecting part (11) and a second connecting part (12) that are electrically connected; The first hardware component (20) and the second hardware component (30) are disposed on the same side of the connector (10) along the thickness direction of the connector (10), and the first hardware component (20) is stacked and electrically connected to the first connecting part (11), and the second hardware component (30) is stacked and electrically connected to the second connecting part (12).

2. The busbar according to claim 1, characterized in that, The hardness of the connector (10) is A1, 0 < A1 ≤ 20HB; and / or, the hardness of the first hardware (20) and the second hardware (30) is A2, 60HB ≤ A2 ≤ 120HB.

3. The busbar according to claim 2, characterized in that, The connector (10) is a soft aluminum component, while the first hardware component (20) and the second hardware component (30) are both hard aluminum components.

4. The busbar according to claim 1, characterized in that, The first connecting part (11) is provided with a first clearance hole (111), and the second connecting part (12) is provided with a second clearance hole (121). The first clearance hole (111) and the second clearance hole (121) are used for the laser used for welding to pass through. In the thickness direction of the connector (10), the orthographic projection of the first clearance hole (111) falls completely within the first hardware component (20), and the orthographic projection of the second clearance hole (121) falls completely within the second hardware component (30).

5. The busbar according to claim 4, characterized in that, The diameters of the first clearance hole (111) and the second clearance hole (121) are both D, where 18mm≤D≤25mm.

6. The busbar according to claim 4, characterized in that, The first hardware (20) is provided with a first laser positioning hole (21), which is exposed inside the first clearance hole (111); The second hardware (30) has a second laser positioning hole (22) which is exposed inside the second clearance hole (121).

7. The busbar according to claim 1, characterized in that, The thickness of both the first hardware component (20) and the second hardware component (30) is H, where 0.5mm ≤ H ≤ 3mm.

8. The busbar according to claim 1, characterized in that, The connector (10) further includes a third connecting part (13), which is electrically connected between the first connecting part (11) and the second connecting part (12), and the third connecting part (13) arches away from the first hardware (20) and the second hardware (30) in the thickness direction of the connector (10).

9. A battery, characterized in that, The battery includes: Bus as described in any one of claims 1 to 8 above; and At least two sets of battery modules (200), each battery module (200) comprising a plurality of battery cells (201); In each of the battery modules (200), each pair of adjacent battery cells (201) are respectively welded to the first hardware (20) and the second hardware (30) of the busbar, and / or, at least two battery cells (201) of two adjacent sets of battery modules (200) are respectively welded to the first hardware (20) and the second hardware (30).

10. An electrical device, characterized in that, Includes the battery as described in claim 9 above.

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