Battery connection bar, battery module and battery pack

Abstract

The utility model provides a battery connection bar, a battery module and a battery pack. The battery connecting bar comprises a connecting part, wherein the connecting part is configured to be connected with an output electrode of a battery cell; the connecting part is provided with a heat dissipation part, and the heat dissipation part is configured to dissipate heat of the battery connecting bar; wherein the connecting part comprises two sub-connecting parts, the battery connecting bar further comprises a switching part, and the switching part is arranged between the two sub-connecting parts.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery connecting bars, battery modules and battery packs. Background Art

[0002] In the related art, as electrical equipment requires fast charging of batteries, the charge and discharge rates of lithium batteries increase.

[0003] However, during the charging and discharging process, due to the limited heat dissipation capacity of the battery connecting bar connected to the output pole of the battery cell, the temperature of the output pole of the battery cell and the battery connecting bar may easily exceed the safety upper limit. Utility Model Content

[0004] The embodiments of the present application provide a battery connector, a battery module, and a battery pack, which are intended to improve the heat dissipation capacity and heat dissipation efficiency of the battery connector and prevent the temperature of the output pole of the battery cell and the battery connector from exceeding the safety upper limit during the battery charging and discharging process.

[0005] In a first aspect, an embodiment of the present application provides a battery connection bar, comprising a connection portion configured to connect to an output terminal of a battery cell; the connection portion is provided with a heat dissipation portion, the heat dissipation portion being configured to dissipate heat from the battery connection bar;

[0006] Wherein, the connecting portion includes two sub-connecting portions, and the battery connecting row further includes a transition portion, and the transition portion is arranged between the two sub-connecting portions.

[0007] In one embodiment, the surface of the sub-connection portion has a heat dissipation area and a welding area;

[0008] The heat dissipation area is surrounded by the welding area, and the heat dissipation portion is arranged in the heat dissipation area.

[0009] In one embodiment, the surface of the sub-connection portion further has a collection line processing area, and the heat dissipation area is connected to the collection line processing area.

[0010] In one embodiment, the ratio of the sum of the areas of the heat dissipation area and the welding area to the area of ​​the acquisition line processing area is in the range of [2, 2.2].

[0011] In one embodiment, the two sub-connecting portions include a first sub-connecting portion and a second sub-connecting portion;

[0012] A heat dissipation portion is provided on a surface of the first sub-connection portion, and / or a heat dissipation portion is provided on a surface of the second sub-connection portion.

[0013] In one embodiment, the adapter portion is provided with a heat dissipation portion.

[0014] In one embodiment, the heat dissipation portion includes a plurality of protrusion structures, and the plurality of protrusion structures are adjacently arranged.

[0015] In one embodiment, the plurality of protrusion structures are arranged in an array, or the plurality of protrusion structures are arranged in a queue.

[0016] In a second aspect, an embodiment of the present application provides a battery module, comprising a plurality of battery cells and a plurality of battery connection bars, wherein the battery connection bars are arranged between two adjacent battery cells.

[0017] In a third aspect, an embodiment of the present application provides a battery pack, comprising a battery management system and a battery module, wherein the battery management system is connected to the battery module.

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

[0019] In an embodiment of the present application, a heat dissipation portion is provided at the connection portion of the battery connection row, wherein the connection portion is configured to be connected to the output pole of the battery cell, and the connection portion includes two sub-connection portions, and the battery connection row also includes a transfer portion, and the transfer portion is provided between the two sub-connection portions to improve the heat dissipation capacity and heat dissipation efficiency of the battery connection row, thereby avoiding the problem of the output pole of the battery cell and the battery connection row temperature exceeding the safety upper limit during the charging and discharging process of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. 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 three-dimensional schematic diagram of a battery connection row provided in an embodiment of the present application;

[0022] Figure 2 is a schematic top view of a battery connection row provided in an embodiment of the present application;

[0023] Figure 3 is a schematic front view of a battery connection strip provided in an embodiment of the present application;

[0024] Figure 4 is a bottom view schematic diagram of a battery connection row provided in an embodiment of the present application;

[0025] Figure 5 It is a three-dimensional schematic diagram of a battery module provided in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] Battery module 10;

[0028] Battery connection bar 100, battery cell 200;

[0029] Connecting portion 102 , output pole 103 , heat dissipation portion 104 , first sub-connecting portion 105 , second sub-connecting portion 106 , transition portion 107 , heat dissipation area 108 , welding area 109 , collection line processing area 110 , and protruding structure 111 . DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings 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 making creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods 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 specified, 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; and "inside" and "outside" refer to the outline of the device.

[0031] In related technologies, as electrical equipment demands faster charging of batteries, the charge and discharge rates of lithium batteries have increased. However, during the charge and discharge process, the battery connection bar connected to the output pole of the battery cell has limited heat dissipation capacity, which can easily cause the temperature of the output pole and the battery connection bar to exceed the safety upper limit. To ensure the normal charge and discharge process of the battery, the battery management system (BMS) will actively limit and reduce the charge and discharge current, limiting the external discharge power and charging power. At the same time, the output pole of the battery cell working at a continuous high temperature will also shorten the battery life and even cause thermal runaway of the battery cell. To this end, an embodiment of the present application provides a battery connection bar, a battery module and a battery pack, by providing a heat dissipation part at the connection part of the battery connection bar, wherein the connection part is configured to be connected to the output pole of the battery cell, and the connection part includes two sub-connection parts, and the battery connection bar also includes a transfer part, and the transfer part is arranged between the two sub-connection parts to improve the heat dissipation capacity and heat dissipation efficiency of the battery connection bar, thereby avoiding the problem of the output pole of the battery cell and the battery connection bar temperature exceeding the safety upper limit during the charging and discharging process of the battery. For specific solutions, please refer to the specific description below.

[0032] It should be noted that, hereinafter, the terms "battery module", "battery", "battery element", "battery cell" and "battery pack" may be used interchangeably and may refer to any of a variety of rechargeable battery chemistries and configurations, including but not limited to lithium ion (e.g., lithium ion phosphate, lithium cobalt oxide, lithium iron phosphate, other lithium metal oxides, etc.), lithium ion polymer, nickel metal hydride, nickel cadmium, nickel metal hydride, nickel zinc, silver zinc or other battery types / configurations. The term "electric vehicle" is used herein to refer to a fully electric vehicle, also known as an EV, a plug-in hybrid electric vehicle, also known as a PHEV, or a hybrid electric vehicle (HEV), wherein the hybrid vehicle employs multiple propulsion sources, one of which is an electric drive system. It should be understood that the same reference numerals are used in multiple figures to refer to the same components or functionally equivalent components, and various modifications to the preferred embodiments, general principles and features described herein will be apparent to those skilled in the art. In addition, the drawings are intended to illustrate the scope of the present application only and are not limiting and should not be considered to be drawn to scale.

[0033] The embodiments of the present application are generally applicable to systems using electric motors, and more specifically, but not exclusively, to electric vehicles using multi-phase electric motors (e.g., inductive motors). Electric vehicles use one or more stored energy sources, such as battery packs, to provide electrical energy to the vehicle. This energy is at least partially used to propel the vehicle. The stored energy can also be used to provide energy required by other vehicle systems, such as vehicle lighting, partitionable heating, ventilation, and air conditioning (HVAC) systems, auxiliary control systems (e.g., sensors, displays, navigation systems, etc.), vehicle entertainment systems (e.g., radio, DVD, MP3, etc.), etc. Conventional electric vehicles include passenger vehicles and vehicles designed to transport goods, examples of which include passenger cars, trucks, electric bicycles, and recreational boats. Electric vehicles also include dedicated work vehicles and carts, some of which can be integrated with forklifts, scissor lifts, lifting and / or articulated boom aerial work platforms, street cleaning systems, conveyor belts, and flatbed transport platforms.

[0034] For details, please refer to Figures 1-4 The battery connection bar 100 specifically includes a connection portion 102, which is configured to be connected to the output pole 103 of the battery cell 200; the connection portion 102 is provided with a heat dissipation portion 104, and the heat dissipation portion 104 is configured to dissipate heat for the battery connection bar 100; wherein, the connection portion 102 includes two sub-connection portions, and the battery connection bar 100 further includes a transfer portion 107, which is provided between the two sub-connection portions to be configured to connect the two sub-connection portions.

[0035] When the connecting portion 102 is connected to the output electrode 103 , the heat dissipation portion 104 is disposed on a side of the connecting portion away from the battery cell 200 .

[0036] In an embodiment of the present application, a heat dissipation portion 104 is provided on the connection portion 102 of the battery connection bar 100, wherein the connection portion 102 is configured to be connected to the output pole 103 of the battery cell, and the connection portion 102 includes two sub-connection portions, and the battery connection bar further includes a transition portion 107, and the transition portion 107 is provided between the two sub-connection portions to improve the heat dissipation capacity and heat dissipation efficiency of the battery connection bar 100, thereby avoiding the problem of the temperature of the output pole 103 of the battery cell and the battery connection bar 100 exceeding the safety upper limit during the charging and discharging process of the battery.

[0037] The battery connector 100 in this application is an important component in the battery system of a new energy vehicle. It is mainly made of aluminum alloy with high electrical and thermal conductivity. Its main functions and effects include connecting battery modules, transmitting current and dissipating heat.

[0038] In a battery management system, the battery connector 100 plays a crucial role. First, as a connector for battery cells, the battery connector 100 connects the cells in series or in parallel to form a complete battery pack, thereby providing a current path that enables the cells to work together and effectively transmit electrical energy to the entire battery pack. Second, because aluminum has excellent electrical conductivity and heat dissipation properties, the connector can quickly and stably transmit current while effectively dissipating heat generated within the battery, reducing battery temperature and improving battery efficiency and lifespan.

[0039] Furthermore, compared to copper busbars, connector bars are less dense and lighter, which not only reduces the overall weight of the battery pack but also increases range. Therefore, in new energy vehicle power battery systems, the use of connector bars can not only improve the overall system performance but also optimize the vehicle's energy consumption to a certain extent.

[0040] In some embodiments, as Figure 1 、 3 As shown, the shape of the cross section of the adapter portion 107 may be an "X" shape, that is, the adapter portion 107 may be a protrusion in the shape of an "X" shape, which may buffer the connection between the two sub-connection portions.

[0041] In some embodiments, as Figure 2 As shown, the surface of the sub-connection portion has a heat dissipation area 108 and a welding area 109 ; the heat dissipation area 108 is surrounded by the welding area 109 , and the heat dissipation portion 104 is disposed in the heat dissipation area 108 .

[0042] It should be noted that the heat dissipation area 108 mainly limits the specific position of the welding part on the connection part. In theory, the entire battery connection row 100 has a certain heat dissipation capacity, and due to its special structure, the heat dissipation area 108 provided with the heat dissipation part 104 has a higher heat dissipation capacity and heat dissipation efficiency than other areas.

[0043] The specific structure of the welding area 109 can be a welding sink, and a through hole is also provided in the central area of ​​the welding sink to facilitate welding of the battery connecting row 100 and the output pole 103 of the battery cell.

[0044] The welding sink is configured as a plane, and the output electrode 103 of the battery cell 200 can be welded to the welding area 109 of the battery connecting bar 100 by laser welding.

[0045] In the embodiment of the present application, the surface of the sub-connecting portion is divided into functional areas, so that the functional areas do not affect each other and the benefits of each function are maximized.

[0046] In some embodiments, as Figure 2 As shown, the surface of the sub-connection portion further has a collection line processing area 110 , and the heat dissipation area 108 is connected to the collection line processing area 110 to be configured to be connected to the collection line.

[0047] The line connecting the heat dissipation area 108 and the collection line processing area 110 can be a clear straight line or an irregular curve, which is specifically set according to the connection relationship between the collection line and the battery connection row 100. In theory, the larger the area of ​​the heat dissipation area 108, the better.

[0048] The collection line processing area 110 can use ultrasonic welding to weld the pressure collection line and fit the temperature collection line probe.

[0049] In the embodiment of the present application, by limiting the specific position of the heat dissipation area 108, it is prevented that the unreasonable setting of the heat dissipation area 108 affects the functions such as current transmission or signal acquisition.

[0050] In some specific embodiments, the ratio of the sum of the areas of the heat dissipation region 108 and the welding region 109 to the area of ​​the acquisition line processing region 110 is in the range of [2, 2.2]. Specifically, the ratio of the sum of the areas of the heat dissipation region 108 and the welding region 109 to the area of ​​the acquisition line processing region 110 can be in the range of 2.00, 2.10, 2.12, 2.2, or any other value between 2 and 2.2, and can be set according to actual needs.

[0051] In the embodiment of the present application, by setting the ratio of the sum of the areas of the heat dissipation area 108 and the welding area 109 to the area of ​​the acquisition line processing area 110 to be in the range of [2, 2.2], the heat dissipation capacity and heat dissipation efficiency of the battery connection bar 100 can be optimized.

[0052] In some other embodiments, the ratio of the sum of the areas of the heat dissipation region 108 and the welding region 109 to the area of ​​the acquisition line processing region 110 may also be outside the range of 2 to 2.2. However, in the experimental research of the inventors of the present application, the battery connection bar 100 with the ratio of the sum of the areas of the heat dissipation region 108 and the welding region 109 to the area of ​​the acquisition line processing region 110 in the range of [2, 2.2] can ensure that its heat dissipation capacity and heat dissipation efficiency are optimal when other functions are normal.

[0053] In some embodiments, as Figure 1 As shown, the two sub-connection parts include a first sub-connection part 105 and a second sub-connection part 106; wherein the surface of the first sub-connection part 105 can be provided with a heat dissipation part 104, and / or the surface of the second sub-connection part 106 can be provided with a heat dissipation part 104. In other words, the heat dissipation part 104 can be provided on either the first sub-connection part 105 or the second sub-connection part 106.

[0054] In the embodiment of the present application, a heat dissipation portion 104 may be provided on the surface of the first sub-connection portion 105 and / or a heat dissipation portion 104 may be provided on the surface of the second sub-connection portion 106. This makes the arrangement of the heat dissipation portion 104 more flexible, and while improving the heat dissipation capacity and heat dissipation efficiency of the battery connection strip 100, other functions of the battery connection strip 100 may not be affected.

[0055] In some embodiments, the adapter portion 107 is provided with a heat dissipation portion 104. Specifically, the heat dissipation portion 104 is provided on a side of the adapter portion 107 away from the battery cell 200.

[0056] In the embodiment of the present application, the heat dissipation portion 104 is provided on the adapter portion 107 , thereby further increasing the heat dissipation capacity and heat dissipation efficiency of the battery connecting strip 100 .

[0057] In some embodiments, as Figure 3 As shown, the heat dissipation portion 104 includes a plurality of protrusion structures 111 , and the plurality of protrusion structures 111 are adjacently arranged.

[0058] In some embodiments, the protrusion structure 111 is specifically a tooth-like structure, and multiple tooth-like structures are arranged adjacent to each other to form a tooth surface. Specifically, the cross-sectional shape of the tooth-like structure can be a triangle or an arc. Furthermore, the triangle can be an isosceles triangle, an equilateral triangle, or other triangles.

[0059] In the embodiment of the present application, the heat dissipation portion 104 is provided with a plurality of protruding structures 111 , thereby increasing the heat dissipation area of ​​the heat dissipation portion 104 and enhancing the heat dissipation efficiency of the heat dissipation portion 104 .

[0060] In some embodiments, as Figure 1 、 3 As shown, the plurality of protruding structures 111 are arranged in a row.

[0061] In another embodiment, a plurality of the protruding structures 111 are arranged in an array.

[0062] In order to better implement the battery connection bar 100 in the embodiment of the present application, the present application further provides a battery module 10 based on the battery connection bar 100. Specifically, Figure 5 As shown, the battery module 10 includes a plurality of battery cells 200 and a plurality of battery connecting bars 100 , wherein the battery connecting bar 100 is disposed between two adjacent battery cells 200 .

[0063] The battery connector 100 serves as a connector for the battery cells 200, allowing multiple cells 200 to be connected in series or in parallel to form a complete battery pack. This connection method not only ensures efficient power transmission but also ensures stable operation of the battery pack. For example, within a battery compartment, the battery cells 200 are welded in series via the connector, forming a battery module.

[0064] In an embodiment of the present application, a heat dissipation portion 104 is provided on the connection portion 102 of the battery connection bar 100, wherein the connection portion 102 is configured to be connected to the output pole 103 of the battery cell, and the connection portion 102 includes two sub-connection portions, and the battery connection bar further includes a transition portion 107, and the transition portion 107 is provided between the two sub-connection portions to improve the heat dissipation capacity and heat dissipation efficiency of the battery connection bar 100, thereby avoiding the problem of the temperature of the output pole 103 of the battery cell and the battery connection bar 100 exceeding the safety upper limit during the charging and discharging process of the battery.

[0065] In order to better implement the battery module 10 in the embodiment of the present application, based on the battery module 10, the present application also provides a battery pack. Specifically, the battery pack includes a battery management system and a battery module 10, and the battery management system is connected to the battery module 10.

[0066] Among them, the battery management system is a system used to monitor and manage the status of the battery pack. Its main functions include real-time monitoring, fault diagnosis, state of charge (SOC) estimation, state of health (SOH) estimation, charge and discharge control, balancing management, thermal management and communication.

[0067] The connector bar, a highly conductive material with excellent electrical conductivity, can effectively transmit current from the battery cells to the entire battery pack. This not only ensures the normal operation of the battery pack, but also significantly improves power transmission efficiency. In addition, the integrated busbar (Cells Contact System, CCS), as an electrical connection structure within the battery module 10, integrates components such as the information collection component and the battery connector bar 100, realizing functions such as high-voltage series and parallel connection of battery cells and overcurrent fuse.

[0068] In an embodiment of the present application, a heat dissipation portion 104 is provided on the connection portion 102 of the battery connection bar 100, wherein the connection portion 102 is configured to be connected to the output pole 103 of the battery cell, and the connection portion 102 includes two sub-connection portions, and the battery connection bar further includes a transition portion 107, and the transition portion 107 is provided between the two sub-connection portions to improve the heat dissipation capacity and heat dissipation efficiency of the battery connection bar 100, thereby avoiding the problem of the temperature of the output pole 103 of the battery cell and the battery connection bar 100 exceeding the safety upper limit during the charging and discharging process of the battery.

[0069] The above is a detailed introduction to the embodiments of the present application. Specific examples are used herein 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 those skilled in the art, based on the ideas of the present application, there may be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery connection bar, characterized in that: The battery connecting bar comprises a connecting portion configured to be connected to the output pole of the battery cell; the connecting portion is provided with a heat dissipation portion, and the heat dissipation portion is configured to dissipate heat from the battery connecting bar; Wherein, the connecting portion includes two sub-connecting portions, and the battery connecting row further includes a transition portion, and the transition portion is arranged between the two sub-connecting portions.

2. The battery connection bar according to claim 1, characterized in that: The surface of the sub-connection portion has a heat dissipation area and a welding area; The heat dissipation area is surrounded by the welding area, and the heat dissipation portion is arranged in the heat dissipation area.

3. The battery connection bar according to claim 2, characterized in that: The surface of the sub-connection portion further has a collection line processing area, and the heat dissipation area is connected to the collection line processing area.

4. The battery connection bar according to claim 3, characterized in that: The ratio of the sum of the areas of the heat dissipation area and the welding area to the area of ​​the acquisition line processing area is in the range of [2, 2.2].

5. The battery connection bar according to claim 1, characterized in that: The two sub-connecting parts include a first sub-connecting part and a second sub-connecting part; A heat dissipation portion is provided on a surface of the first sub-connection portion, and / or a heat dissipation portion is provided on a surface of the second sub-connection portion.

6. The battery connection bar according to claim 1, characterized in that: The adapter portion is provided with a heat dissipation portion.

7. The battery connection bar according to any one of claims 1 to 6, characterized in that: The heat dissipation portion includes a plurality of protrusion structures, and the plurality of protrusion structures are adjacently arranged.

8. The battery connection bar according to claim 7, characterized in that: The plurality of protrusion structures are arranged in an array, or the plurality of protrusion structures are arranged in a queue.

9. A battery module, characterized in that: The invention comprises a plurality of battery cells and a plurality of battery connecting bars according to any one of claims 1 to 8, wherein the battery connecting bar is arranged between two adjacent battery cells.

10. A battery pack, characterized in that: The invention comprises a battery management system and the battery module as claimed in claim 9, wherein the battery management system is connected to the battery module.

Images