Vehicle lithium battery

Abstract

The utility model provides a vehicle lithium battery which comprises a shell and a plurality of battery cells arranged in the shell, the plurality of battery cells are conducted through a busbar, and a sampling line is arranged on the busbar; the electrodes of the battery cells are provided with screw rods, two opposite sides of the busbar are respectively provided with a through hole, and the through holes in the busbar are respectively sleeved on the screw rods of the two battery cells; the end part of the sampling line is provided with a wiring terminal, a connecting hole of the wiring terminal is sleeved on the screw rod, and the wiring terminal is positioned on the upper side of the busbar; the screw rod is connected with a nut in a matching manner; and the nut is used for tightly pressing the wiring terminal and the busbar on the electrode of the battery cell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a lithium battery for vehicle. BACKGROUND

[0002] The lithium battery for vehicle is an energy storage and supply component of electric bicycles such as electric two-wheelers and electric three-wheelers, which directly affects the endurance mileage, performance and service life of the electric bicycle. The lithium battery is usually composed of a plurality of battery cells in series and parallel connection through busbars, forming a battery cell module with high voltage and high capacity. These battery cells are generally made of lithium metal or lithium alloy chemicals, which have the advantages of high voltage and light weight.

[0003] In the prior art, the busbars are usually welded on the electrodes of the battery cells by laser welding, and the sampling lines are connected to the positive electrodes of the battery cells by soldering. This connection method at least has the following problems:

[0004] 1. Since the busbars and the sampling lines are both welded, the busbars need to be ground off and re-welded during after-sales maintenance, which is not convenient for the installation and removal of the busbars and the sampling lines.

[0005] 2. Since the busbars are laser welded, the material of the busbars needs to meet the requirements of laser welding and is limited. CONTENT OF THE INVENTION

[0006] The present application provides a lithium battery for vehicle, comprising a shell and a plurality of battery cells arranged in the shell, the plurality of battery cells being connected through busbars, and a sampling line being arranged on the busbar.

[0007] The electrode of the battery cell has a screw rod, the opposite sides of the busbar each have a through hole, and the through holes of the busbar are respectively sleeved on the screw rods of the two battery cells.

[0008] The end of the sampling line has a terminal, the connecting hole of the terminal is sleeved on the screw rod, and the terminal is located on the upper side of the busbar.

[0009] The screw rod is matched with a nut, and the nut presses the terminal and the busbar on the electrode of the battery cell.

[0010] In one possible implementation, the lithium battery for vehicle provided by the present application has a screw rod, and the lower end of the screw rod is welded on the electrode of the battery cell.

[0011] In one possible implementation, the lithium battery for vehicle provided by the present application has a screw rod, and the lower end of the screw rod has a substrate, and the bottom end of the substrate is welded on the electrode of the battery cell.

[0012] In one possible implementation, the vehicle lithium battery provided by the embodiment of the application has a copper busbar.

[0013] In one possible implementation, the vehicle lithium battery provided by the embodiment of the application has a shell including a box body and a box cover arranged at an opening of the box body.

[0014] Beneficial effects: the screw rod is welded on the electrode of the battery cell, the through hole is arranged on the busbar, and the terminal is arranged at the end of the sampling line, so that the sampling line and the busbar are fixed on the electrode of the battery cell by sleeving the busbar and the terminal on the screw rod and connecting and compressing the sampling line and the busbar by the nut. In this way, since the busbar and the sampling line are not welded, when the battery needs to be maintained or repaired, the busbar and the terminal can be easily disassembled by unscrewing the nut. Moreover, since the nut is used for connection and fastening, instead of laser welding, the material of the busbar can be more diverse, and is not limited by the requirement of laser welding. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is a schematic view of the appearance of the vehicle lithium battery provided by the embodiment of the application;

[0017] Figure 2 is an exploded schematic view of the vehicle lithium battery provided by the embodiment of the application;

[0018] Figure 3 is a schematic view of the inside of the vehicle lithium battery provided by the embodiment of the application;

[0019] Figure 4 is Figure 3 is an enlarged schematic view of position A in FIG. 8.

[0020] EXPLANATION OF REFERENCE NUMERALS

[0021] 10 - shell;

[0022] 11 - box body;

[0023] 12 - box cover;

[0024] 20 - battery cell;

[0025] 21 - electrode;

[0026] 23 - screw rod;

[0027] 231-Substrate;

[0028] 30-Bus;

[0029] 31 - Through hole;

[0030] 40 - Terminal block;

[0031] 41 - Connection hole;

[0032] 50-nut. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of this application. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] Figure 1 This is a schematic diagram of the appearance of a vehicle lithium battery provided in an embodiment of this application; Figure 2 This is an exploded schematic diagram of a vehicle lithium battery provided in an embodiment of this application; Figure 3 This is an internal schematic diagram of a vehicle lithium battery provided in an embodiment of this application; Figure 4 yes Figure 3 Enlarged diagram of point A in the middle.

[0035] See Figures 1 to 4 As shown, this application provides a vehicle lithium battery, including a casing 10 and a plurality of battery cells 20 disposed within the casing 10. The casing 10 includes a housing 11 and a cover 12 disposed at the opening of the housing 11. The plurality of battery cells 20 are connected by a busbar 30, and the busbar 30 is provided with sampling lines (not shown in the figure), wherein:

[0036] The electrode 21 of the electric core 20 is provided with a screw rod 23, the lower end of the screw rod 23 is provided with a base plate 231, and the bottom end of the base plate 231 is welded on the electrode 21 of the electric core 20. The bus bar 30 is a copper bus bar 30, for example, T2 red copper, the copper bus bar 30 can increase the overcurrent capacity, and the opposite sides of the bus bar 30 are provided with a through hole 31 respectively, and the through holes 31 on the bus bar 30 are sleeved on the screw rods 23 of the two electric cores 20 respectively. The end of the sampling line is provided with a terminal 40, the connecting hole 41 of the terminal 40 is sleeved on the screw rod 23, and the terminal 40 is located on the upper side of the bus bar 30. The screw rod 23 is matched and connected with a nut 50, and the nut 50 tightly presses the terminal 40 and the bus bar 30 on the electrode 21 of the electric core 20.

[0037] By welding the screw rod 23 on the electrode 21 of the electric core 20, providing the through hole 31 on the bus bar 30, and providing the terminal 40 on the end of the sampling line, the sampling line and the bus bar 30 can be fixed on the electrode 21 of the electric core 20 by sleeving the bus bar 30 and the terminal 40 on the screw rod 23 and connecting and pressing by the nut 50. Since the bus bar 30 and the sampling line are not welded, when the battery needs to be maintained or repaired, the bus bar 30 and the terminal 40 can be easily disassembled by only unscrewing the nut 50. Moreover, since the nut 50 is used for connection and fastening, instead of laser welding, the material of the bus bar 30 can be more diverse, and is not limited by the requirements of laser welding.

[0038] In addition, the process of welding the screw rod 23 on the electrode 21 is simple and convenient to operate, and can realize automatic production and improve production efficiency. The welding connection does not need to drill holes, and the cross section is not weakened, so that the work and material can be saved, and economic effect can be obtained. The rigidity and integrity of the welding structure are large, which is beneficial to improve the stability and carrying capacity of the structure. The connection mode of the bus bar 30 uses the nut 50 to press, which is convenient for production and maintenance. The terminal 40 can be directly pressed under the nut 50, without using soldering, saving material and labor cost.

[0039] Advantages: In the production process of the pack, the production process can not use the laser welding machine, and the sampling line can be welded with the terminal 40 in advance and directly pressed on the screw rod position; the production efficiency can be improved, the labor cost can be reduced, when after-sales maintenance is needed, the electric core 20 can be directly replaced after the flange nut 50 is disassembled, and the bus bar 30 can be directly disassembled when damaged, without the need to polish and re-weld the bus bar 30, avoiding the damage to other electric cores 20.

[0040] In the description of the embodiments of the present application, it should be understood that, unless specifically defined and limited otherwise, the terms "mount", "connect", "connection" should be interpreted broadly, for example, can be fixedly connected, can be indirectly connected through an intermediate medium, can be internal communication of two elements or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. The terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0041] The terms "first", "second", "third", "fourth" and the like in the description of the present application and claims and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. For example, it can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[0042] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lithium battery for vehicles, characterized in that, It includes a housing and a plurality of battery cells disposed within the housing, wherein the plurality of battery cells are connected by a bus, and the bus is provided with sampling lines; The electrode of the battery cell has a screw, and each side of the busbar has a through hole. The through holes on the busbar are respectively sleeved on the screws of the two battery cells. The sampling line has a terminal block at its end, the terminal block has a connection hole fitted onto the screw, and the terminal block is located on the upper side of the busbar; A nut is fitted onto the screw, and the nut presses the terminal block or busbar onto the electrode of the battery cell.

2. The automotive lithium battery according to claim 1, characterized in that, The lower end of the screw is welded to the electrode of the battery cell.

3. The automotive lithium battery according to claim 2, characterized in that, The lower end of the screw has a substrate, and the bottom end of the substrate is welded to the electrode of the battery cell.

4. The automotive lithium battery according to claim 1, characterized in that, The busbar is a copper busbar.

5. The automotive lithium battery according to claim 1, characterized in that, The outer casing includes a box body and a lid disposed at an opening in the box body.

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