Busbar, and battery module

Abstract

Disclosed in the present application are a busbar and a battery module. The busbar comprises: a conductive plate; a first electrical connection member and a second electrical connection member, which are connected to the conductive plate; and a first locking member and a second locking member, wherein the first electrical connection member is provided with a first threaded structure, the second electrical connection member is provided with a second threaded structure, the rotation direction of the first threaded structure is opposite to the rotation direction of the second threaded structure, the first locking member is screwed to the first electrical connection member, and the second locking member is screwed to the second electrical connection member.

Description

Busbar and battery module

[0001] The present application claims priority to the Chinese patent application No. 202421551839X filed on July 02, 2024 with the China Patent Office, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a busbar and a battery module. BACKGROUND

[0003] In recent years, in the field of aerospace, more and more aircraft main power energy is provided by batteries. In order to make the aircraft have faster flight speed, the battery pack used by the aircraft generally needs to have the characteristics of large rate discharge, and in order to realize the long endurance of the aircraft, the high specific energy battery pack becomes the first choice for the aircraft power supply. In order to realize the high specific energy characteristics of the battery pack, it is particularly important to select a suitable single battery packaging form. At present, compared with all battery packaging forms, the specific energy of soft package battery is the highest, so the soft package battery has become the mainstream demand for providing the main power energy of the aircraft.

[0004] Among them, a plurality of single batteries can be connected in parallel to increase the total output current of the battery pack and realize large rate discharge of the battery pack. Specifically, the soft package battery is connected in series and parallel through the busbar, and the earlet stringing and parallel process mainly includes tin soldering, ultrasonic welding, spot welding, laser welding, earlet punching and thread connection or riveting. For the full parallel battery module, no matter which process is used to gather all the positive or negative earlets of the single battery through the busbar, the reliability design of the busbar is crucial. TECHNICAL PROBLEM

[0005] The traditional busbar of the battery module has only one stud for external connection. When the nut is screwed with the stud, the busbar and the earlet are easily damaged by the torque of the nut, and the battery will malfunction, so the reliability of this scheme is poor. TECHNICAL SOLUTION

[0006] In a first aspect, the application provides a busbar, comprising a conductive plate, a first electrical connector, a second electrical connector, a first locking member and a second locking member, the first electrical connector and the second electrical connector are connected to the conductive plate, the first electrical connector is provided with a first threaded structure, the second electrical connector is provided with a second threaded structure, the rotation direction of the first threaded structure is opposite to the rotation direction of the second threaded structure; the first locking member is provided with a third threaded structure, the rotation direction of the third threaded structure is the same as the rotation direction of the first threaded structure, the first locking member is screwed with the first electrical connector; the second locking member is provided with a fourth threaded structure, the rotation direction of the fourth threaded structure is the same as the rotation direction of the second threaded structure, the second locking member is screwed with the second electrical connector.

[0007] In a second aspect, the application provides a battery module, comprising one or more single batteries and at least two busbars as described above, wherein one of the busbars is a positive busbar and the other is a negative busbar, the single battery comprises a positive tab and a negative tab, the positive tab is connected to the positive busbar, and the negative tab is connected to the negative busbar. Advantages

[0008] 1) When the battery module of the application is connected to the outside through the first electrical connector and the second electrical connector on the busbar, the torque applied to the busbar during the connection process can be offset by tightening the locking members on the two electrical connectors at the same time, thereby preventing the busbar from being damaged by too much torque during the connection process, thereby protecting the busbar and the tabs connected to the busbar.

[0009] 2) The busbar can reduce the fixing or supporting effect of the insulating base on the busbar during connection, so that the structure of the insulating base can be simplified under the premise of ensuring the insulating effect of the insulating base, for example, the insulating base can be made lightweight and thin, thereby reducing the weight of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a structural schematic diagram of a battery module of an embodiment of the application;

[0011] Figure 2 is an exploded structural diagram of a battery module of an embodiment of the application;

[0012] Figure 3 is a structural schematic diagram of a busbar of an embodiment of the application.

[0013] Among them, the meaning of the reference signs is as follows:

[0014] 1, single battery; 11, positive pole lug; 12, negative pole lug; 2, buffer; 3, insulating base; 31, mounting groove; 32, through groove; 4, positive busbar; 5, negative busbar; 6, first electrical connector; 61, connecting seat; 62, column; 7, second electrical connector; 8, conductive plate; 81, connecting groove; 9, insulating cover; 91, through hole. Embodiments of the present application

[0015] The application discloses a busbar and a battery module. The soft package battery module is formed by arranging one or more soft package batteries in a fixed shell in parallel and connecting the pole lugs of the soft package batteries in parallel through the busbar.

[0016] Embodiment one

[0017] The embodiment discloses a busbar, which comprises a conductive plate 8, a first electrical connector 6, a second electrical connector 7, a first locking member and a second locking member. The first electrical connector 6 and the second electrical connector 7 are connected to the conductive plate 8. The first electrical connector 6 is provided with a first threaded structure, and the second electrical connector 7 is provided with a second threaded structure. The rotation direction of the first threaded structure is opposite to that of the second threaded structure.

[0018] Correspondingly, the first locking member is provided with a third threaded structure, and the rotation direction of the third threaded structure is the same as that of the first threaded structure, so that the first locking member can be used for screwing with the first electrical connector 6. The second locking member is provided with a fourth threaded structure, and the rotation direction of the fourth threaded structure is the same as that of the second threaded structure, so that the second locking member can be used for screwing with the second electrical connector 7.

[0019] On the basis of the structure, when the busbar is used, the pole lug of the single battery 1 can be electrically connected to the busbar. The mode of electrically connecting the pole lug to the busbar mainly includes tin soldering, ultrasonic welding, spot welding, laser welding, screwing or riveting after punching the pole lug, etc.

[0020] When the first electrical connector 6 and the second electrical connector 7 of the busbar are connected to the outside, the electrical connection end sleeve of the external electrical connection terminal (for example, a copper terminal) can be sleeved or wound on the column 62 of the first electrical connector 6 and the second electrical connector 7. Then, the locking members matched with the two electrical connectors are sleeved on the columns 62 of the first electrical connector 6 and the second electrical connector 7 respectively. Then, the two locking members are rotated in opposite directions at the same time, so that the external electrical connection terminal is fixedly connected to the columns 62 of the first electrical connector 6 and the second electrical connector 7, realizing the electrical conduction between different battery modules or the electrical conduction between the battery module and an external power consumption device.

[0021] Thus, the plurality of single batteries 1 can be connected in series and parallel through the bus bar, and the bus bar can realize external output current through the first electrical connection member 6 and the second electrical connection member 7.

[0022] It is worth noting that the threads on the first electrical connection member 6 and the second electrical connection member 7 are opposite in rotation direction, so that when the bus bar is connected externally, the torque applied to the bus bar during the connection process can be offset by simultaneously tightening the locking members on the two electrical connection members in opposite directions, thereby preventing the bus bar from being subjected to too much torque during the connection process and causing the bus bar to be pulled apart from the tab, thereby preventing the tab from being damaged and protecting the bus bar and the tab.

[0023] It should be noted that in the related art, when the bus bar is connected externally through a stud, only one stud on the bus bar is connected externally. When the nut is rotated to connect externally, the bus bar and the tab are easily damaged by the torque of the nut, thereby causing the battery to malfunction.

[0024] However, the present application provides two sets of electrical connection members on the same bus bar, and the threads on the two sets of electrical connection members are opposite in rotation direction, so that when the two sets of electrical connection members are connected to the locking members at the same time, the torque applied to the bus bar during the process of tightening the locking members on the two sets of electrical connection members in opposite directions can be offset, thereby ensuring the relative fixation between the bus bar and the battery tab and protecting the tab and the bus bar during the connection process.

[0025] In addition, the first locking member and the second locking member can be nuts.

[0026] In some embodiments, a glue layer is provided between the first electrical connection member 6 and the second electrical connection member 7, and the first locking member and the second locking member are respectively screwed with the first electrical connection member 6 and the second electrical connection member 7, and then the glue layer is used to bond the first locking member and the second locking member.

[0027] In some embodiments, the glue layer can be a conductive glue layer, and the first locking member and the second locking member are both nuts. When the first electrical connection member 6 and the second electrical connection member 7 on the bus bar are connected to the corresponding nuts at the same time, the glue layer is located between the two electrical connection members and bonds the two nuts.

[0028] Since the nuts cannot be rotated after being bonded by the glue layer, it can be ensured that even if the battery module is subjected to vibration after the nuts are connected to the electrical connection members, the nuts will not loosen, thereby ensuring the reliability of the external connection of the bus bar.

[0029] In some embodiments, the first electrical connection member 6 and the second electrical connection member 7 each include a connecting seat 61 and a column body 62, and the connecting seat 61 connects the conductive plate 8 and the column body 62; wherein the first thread structure or the second thread structure is provided on the outer periphery of the column body 62.

[0030] The first and second electrical connectors 6 and 7 can be made of metal materials such as copper or aluminum, and have electrical conductivity. The connecting seat 61 and the column 62 can be integrally formed with the conductive plate 8, or the electrical connector can be a separate component and fixedly connected to the conductive plate 8 through the connecting seat 61.

[0031] It should be noted that the cross-sectional area of the connecting seat 61 is larger than that of the column 62. When the electrical connector is connected to the external electrical terminal, the nut presses the external electrical terminal against the connecting seat 61. When the electrical connector is connected to the external electrical terminal, the connection area between the electrical terminal and the connecting seat 61 is large, so that the flow area at this position is increased, which can alleviate the heating of the electrical connector and the electrical terminal.

[0032] In some embodiments, the conductive plate 8 is provided with one or more connecting grooves 81, and the connecting grooves 81 extend through the conductive plate 8.

[0033] When connected, the tab of the single battery 1 extends out of the connecting groove 81 to the upper end of the conductive plate 8, is bent, and is welded to the upper surface of the conductive plate 8.

[0034] The conductive plate 8 is a copper or aluminum metal plate. The conductive plate 8 is provided with corresponding connecting grooves 81 corresponding to the number of single batteries 1 in the battery module, so that the tabs on each single battery 1 can be reliably positioned when connected to the busbar, and the tabs are not displaced and damaged under stress during connection.

[0035] Embodiment Two

[0036] Referring to FIG. 1, the embodiment discloses a battery module, which includes one or more single batteries 1 and at least two busbars of the embodiment one, one of which is a positive busbar 4 and the other of which is a negative busbar 5. Referring to FIG. 2, the single battery 1 includes a positive tab 11 and a negative tab 12, and the positive tab 11 of each single battery 1 is connected to the positive busbar 4, and the negative tab 12 is connected to the negative busbar 5.

[0037] On the basis of the structure, when the battery module of the application is used, the battery module can be connected to external power consumption equipment or other battery modules through the busbars when connected to the outside, and in some embodiments, the power connection end of the power connection terminal (such as a copper terminal) can be sleeved on the column body 62 of the first power connection piece 6 and the second power connection piece 7, or the power connection end of the power connection wire can be wound or bent and then sleeved on the column body 62 of the first power connection piece 6 and the second power connection piece 7, and then the power connection end of the power connection terminal or the power connection wire is fixed on the first power connection piece 6 and the second power connection piece 7 through the nut. When connecting, the negative busbar 5 should be connected first, and then the positive busbar 4 should be connected, so as to prevent short circuit or reverse current operation. When tightening the nut, the principle of pre-tightening and then gradually increasing the force should be followed to ensure firm and reliable connection.

[0038] In this way, a plurality of single batteries 1 are connected in parallel through the tabs and busbars, which can increase the total output current of the battery module and further improve the discharge rate of the battery module, because parallel connection allows current to be shared among a plurality of single batteries 1, thereby reducing the current pressure borne by each single battery 1.

[0039] In this way, a plurality of single batteries 1 are connected in parallel through the tabs and busbars, which can increase the total output current of the battery module and further improve the discharge rate of the battery module, because parallel connection allows current to be shared among a plurality of single batteries 1, thereby reducing the current pressure borne by each single battery 1.

[0040] In some embodiments, the conductive plate 8 is arranged at the end of the single battery 1, and the first power connection piece 6 and the second power connection piece 7 are arranged on the side of the conductive plate 8 away from the single battery 1.

[0041] On the basis of the structure, when connecting, the positive tab 11 of each single battery 1 can be extended through the connecting groove 81 of the positive busbar 4 and electrically connected to the positive busbar 4, and the negative tab 12 of each single battery 1 can be extended through the connecting groove 81 of the negative busbar 5 and electrically connected to the negative busbar 5.

[0042] In this way, a plurality of single batteries 1 are connected in parallel through the tabs and busbars, which can increase the total output current of the battery module and further improve the discharge rate of the battery module, because parallel connection allows current to be shared among a plurality of single batteries 1, thereby reducing the current pressure borne by each single battery 1.

[0043] In some embodiments, the battery module comprises an insulating base 3, and the insulating base 3 is arranged between the single battery 1 and the conductive plate 8. Wherein, the side of the insulating base 3 away from the single battery 1 is recessed with a mounting groove 31, and the positive bus bar 4 or the negative bus bar 5 is embedded in the mounting groove 31.

[0044] Wherein, the insulating base 3 can be made of ABS resin material, which has ductility and insulation performance. Arranging the insulating base 3 between the bus bar and the end face of the single battery 1 can form good insulation, and embedding the bus bar in the mounting groove 31 of the insulating base 3 can support the conductive plate 8 by the insulating base 3, thereby enhancing the rigidity of the bus bar.

[0045] It should be noted that, since the application sets two groups of power connection members with opposite screw directions on the same bus bar, when connecting the bus bar, the torque acting on the bus bar can be offset by tightening the nuts corresponding to the two groups of power connection members in opposite directions, that is, the bus bar can reduce the fixing or supporting effect of the insulating base 3 during connection, so that the structure of the insulating base 3 can be simplified under the premise of ensuring its insulation effect, for example, the insulating base 3 can be made light and thin, thereby reducing the weight of the battery module.

[0046] In some embodiments, two mounting grooves 31 are arranged side by side on the insulating base 3, and the positive bus bar 4 and the negative bus bar 5 are respectively arranged in the two mounting grooves 31.

[0047] Since the positive lug 11 and the negative lug 12 of the battery are both protruded from the same end of the battery, when two mounting grooves 31 are arranged side by side on the insulating base 3 to respectively install two bus bars, the positive lug 11 of the battery and the positive bus bar 4, and the negative lug 12 of the battery and the negative bus bar 5 can be connected, and meanwhile, the insulating base 3 can be arranged only one, thereby simplifying the connection structure.

[0048] In some embodiments, the insulating base 3 is provided with a through groove 32, and the through groove 32 is arranged corresponding to the connecting groove 81.

[0049] Wherein, the lug of the battery passes through the through groove 32 from bottom to top and is bent to abut and welded on the upper surface of the conductive plate 8 after protruding to the upper end of the conductive plate 8 through the connecting groove 81. The through groove 32 is arranged corresponding to the connecting groove 81, which can ensure that the bus bar is assembled in place in the mounting groove, and the lug can be reliably positioned, thereby avoiding displacement and damage of the lug under stress during connection.

[0050] In some embodiments, the battery module further comprises an insulating cover 9, and the insulating cover 9 is arranged on the side of the conductive plate 8 away from the single battery 1. Wherein, the insulating cover 9 is provided with a through hole 91, and the through hole 91 is arranged corresponding to the first power connection member 6 and the second power connection member 7.

[0051] The first and second electrical connecting members 6 and 7 can extend out of and be externally connected via the through hole 91 of the insulating cover 9, and the insulating cover 9 can insulate and protect the busbar, prevent external electrical equipment from simultaneously contacting the electrical connecting members and the surface of the busbar to cause short circuit, and improve the safety of the device.

[0052] In some embodiments, the plurality of single batteries 1 are stacked, and a buffer 2 is arranged between two adjacent single batteries 1.

[0053] The buffer 2 can be a silica gel strip, a rubber pad, etc., and the buffer 2 arranged between the two single batteries 1 can reserve an expansion space in advance. When the single batteries 1 are expanded due to heat or aging, the two single batteries 1 can press the buffer 2 to occupy the expansion space, thereby preventing the two single batteries 1 from directly pressing each other and causing damage to the battery module.

Claims

1. A busbar, comprising a conductive plate (8), a first connecting piece (6), a second connecting piece (7), a first locking piece and a second locking piece, the first connecting piece (6) and the second connecting piece (7) are connected to the conductive plate (8), the first connecting piece (6) is provided with a first threaded structure, the second connecting piece (7) is provided with a second threaded structure, the rotation direction of the first threaded structure is opposite to the rotation direction of the second threaded structure; the first locking piece is provided with a third threaded structure, the rotation direction of the third threaded structure is the same as the rotation direction of the first threaded structure, the first locking piece is screwed with the first connecting piece (6) ; the second locking piece is provided with a fourth threaded structure, the rotation direction of the fourth threaded structure is the same as the rotation direction of the second threaded structure, the second locking piece is screwed with the second connecting piece (7).

2. The busbar of claim 1, wherein: A glue layer is arranged between the first connecting piece (6) and the second connecting piece (7), the glue layer bonds the first locking piece and the second locking piece.

3. The busbar of claim 1, wherein: The first connecting piece (6) and the second connecting piece (7) each comprise a connecting seat (61) and a column (62), the connecting seat (61) connects the conductive plate (8) and the column (62) ; the first threaded structure or the second threaded structure is arranged on the outer periphery of the column (62).

4. The busbar of claim 1, wherein: One or more connecting grooves (81) are arranged on the conductive plate, the connecting grooves (81) penetrate the conductive plate (8). 5.A battery module, comprising one or more single batteries (1) and at least two busbars according to any one of claims 1-4, wherein one of the busbars is a positive busbar (4) and the other is a negative busbar (5), the single battery (1) comprises a positive tab (11) and a negative tab (12), the positive tab (11) is connected to the positive busbar (4), and the negative tab (12) is connected to the negative busbar (5).

6. The battery module of claim 5, wherein, The conductive plate (8) is arranged at the end of the single battery (1), and the first connecting piece (6) and the second connecting piece (7) are arranged on the side of the conductive plate (8) away from the single battery (1).

7. The battery module of claim 5 or 6, wherein: The battery module comprises an insulating base (3) arranged between the single battery (1) and the conductive plate (8), and a mounting groove (31) is recessed on the side of the insulating base (3) away from the single battery (1), and the positive busbar (4) or the negative busbar (5) is embedded in the mounting groove (31).

8. The battery module of claim 7, wherein: Two mounting grooves (31) are arranged side by side on the insulating base (3), and the positive busbar (4) and the negative busbar (5) are respectively arranged in the two mounting grooves (31).

9. The battery module of claim 5, wherein: The battery module comprises an insulating cover (9) arranged on the side of the conductive plate (8) away from the single battery (1), and a through hole (91) is arranged on the insulating cover (9), and the through hole (91) is arranged corresponding to the first connecting piece (6) and the second connecting piece (7).

10. The battery module of claim 5, wherein: A plurality of the single batteries (1) are stacked, and a buffer (2) is arranged between two adjacent single batteries (1).

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