Busbar structure, battery pack and electric equipment
By adopting a overlap and welded busbar structure in battery assembly, combined with fixtures and high-frequency resistance welding technology, the shortcomings of the existing busbar in terms of overcurrent and tensile strength are solved, and efficient overcurrent and tensile resistance performance that meets fast charging requirements are achieved.
Patent Information
- Application Number
- CN202421786503.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-25
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-07-25
AI Technical Summary
In the existing battery assembly, the busbar has shortcomings in overcurrent and tensile strength, which is difficult to meet the thickness requirements of fast charging and the mechanical performance requirements of the entire life cycle of the vehicle.
A busbar structure is adopted, wherein the first busbar overlaps and overlaps the second busbar and is welded and fixed by a fixing member. Combined with a high-frequency resistance welding process, the tensile strength and overcurrent capability are enhanced.
This structure not only increases the overflow area and meets the thickness requirements of fast charging, but also improves the tensile strength, reduces weight and cost, and has extremely high mass production value.
Smart Images
Figure CN223039133U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and more particularly, to a bus bar structure, a battery pack, and an electrical device. Background Art
[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their energy-saving and environmental protection advantages. For electric vehicles, battery technology is an important factor related to their development.
[0003] In related technologies, in addition to increasing the energy density of the battery, it is also necessary to ensure the overcurrent capacity and tensile strength during battery assembly. Therefore, there is an urgent need for a bus bar to solve the problems of overcurrent capacity and tensile strength during assembly. Summary of the Utility Model
[0004] The purpose of the embodiments of the present application is to provide a bus bar structure, a battery pack, and an electrical device, which can increase the overcurrent area and at the same time increase the tensile strength.
[0005] In a first aspect, an embodiment of the present application provides a bus bar structure, including: a first bus bar configured with a first connection end; a second bus bar configured with a second connection end, the first connection end overlapping the second connection end; and a fixing member disposed at the overlapping position of the first connection end and the second connection end.
[0006] In the above implementation process, the first bus bar overlaps with the second bus bar, and the overlapping part of the first bus bar and the second bus bar is welded, and the overlapping part is fixed by a fixing member, which can not only increase the overcurrent area and meet the thickness requirements of fast charging, but also increase the tensile strength.
[0007] In some embodiments, the overlapping part of the first connection end and the second connection end is welded.
[0008] In some embodiments, the first connection end and the second connection end are fixed by high-frequency resistance welding.
[0009] In the above implementation process, the first bus bar and the second bus bar adopt a mature high-frequency resistance welding process, which can not only increase the tensile strength, but also save costs. Compared with the existing bus bar structure, the weight is greatly reduced, and it has extremely high mass production value.
[0010] In some embodiments, the first connection end is configured with a first fixing hole, the second connection end is configured with a second fixing hole, the centers of the first fixing hole and the fixing hole are on the same center line, and the fixing member passes through the first fixing hole and the second fixing hole.
[0011] In the above implementation process, the fixing member can fix the first bus bar and the second bus bar by passing through the first fixing hole and the second fixing hole, increasing the current-carrying capacity and the tensile strength, and meeting the requirements of fast charging.
[0012] In some embodiments, the fixing member is exposed in the first fixing hole and the second fixing hole, and laser welding is used at the contact positions between the fixing member and the first fixing hole and the second fixing hole.
[0013] In the above implementation process, the fixing member is respectively exposed in the first fixing hole and the second fixing hole, which can facilitate the welding of the fixing member to the first bus bar and the second bus bar respectively, increasing the current-carrying capacity and the tensile strength, and meeting the requirements of fast charging.
[0014] In some embodiments, a plurality of the first fixing holes are provided, a plurality of the second fixing holes are provided, and each of the fixing holes corresponds to one of the second fixing holes.
[0015] In the above implementation process, by providing a plurality of the first fixing holes and the second fixing holes, after the fixing member passes through the first fixing hole and the second fixing hole, different positions of the first bus bar and the second bus bar can be fixed, increasing the current-carrying capacity and the tensile strength, and meeting the requirements of fast charging.
[0016] In some embodiments, the first bus bar and the second bus bar are made of the same material.
[0017] In a second aspect, the present application further provides a battery pack, including: a plurality of battery modules; and a bus bar structure as described in any one of the above, the bus bar structure being connected between two adjacent battery modules.
[0018] Since the battery pack provided in the second aspect includes the bus bar structure, the battery pack has all the technical effects of the bus bar structure, which will not be elaborated herein.
[0019] In a third aspect, the present application further provides an electrical device, including the battery pack as described above.
[0020] Since the electrical device provided in the third aspect includes the battery pack, the electrical device has all the technical effects of the battery pack, which will not be elaborated herein.
[0021] Other features and advantages of the present disclosure will be described in the subsequent specification, or some features and advantages can be inferred from the specification without doubt, or can be learned by implementing the above technologies of the present disclosure.
[0022] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Brief Description of the Drawings
[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0024] Figure 1 Structural schematic diagram of the busbar structure provided by the embodiment of the present application;
[0025] Figure 2 Lap joint schematic diagram of the busbar structure provided by the embodiment of the present application;
[0026] Figure 3 is Figure 1 A-A cross-sectional view of.
[0027] Reference Numerals
[0028] 100, first busbar; 101, first connection end; 200, second busbar; 201, second connection end; 300, fixing member; 400, high-frequency resistance welding; 500, laser welding. Detailed Description of the Embodiments
[0029] 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 a part of the embodiments of the present application, rather than all of the embodiments. Usually, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application to be protected, but only represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.
[0030] In the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation.
[0031] Moreover, in addition to being used to indicate orientation or positional relationship, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.
[0032] In addition, the terms "installed", "set up", "provided with", "connected", and "linked" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or a point connection; it can be directly connected, or indirectly connected through an intermediate medium, or there can be internal communication between two devices, components, or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0033] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, components, or parts (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, components, or parts. Unless otherwise specified, the meaning of "a plurality" is two or more.
[0034] Embodiment
[0035] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric transportation such as electric bicycles, electric motorcycles, and electric vehicles, as well as in many fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also constantly increasing.
[0036] The inventor found during the design process that the busbar material of the current power battery system is mostly T2 copper, and a few solutions use 1060 series aluminum. T2 copper has no advantages in terms of weight and cost; the 1060 series aluminum has a lower hardness and weaker strength, and there is a risk of excessive torque attenuation and fracture at the bending point under the vibration and shock conditions during the whole vehicle life cycle.
[0037] The 6-series aluminum, due to its relatively high content of alloying elements (the main components being Mg and Si), has a relatively high hardness and can meet the mechanical property requirements under the vibration and shock conditions throughout the vehicle's life cycle. For the lap welding of 6-series aluminum: the substrate thickness allowed for ultrasonic and laser welding is generally within 2 mm, which cannot meet the welding thickness requirements for fast charging at a rate above 3C (450 A - 600 A) (to meet the requirements of overcurrent temperature rise, the designed range of substrate thickness is 3 mm - 4 mm); the electromagnetic pulse welding equipment and process are costly and not suitable for mass production solutions, and it is difficult for the contact area after welding a 4-mm-thick substrate to meet the overcurrent requirements; the presence of 6-series aluminum alloying elements results in the welding strength at the high-frequency resistance welding interface not meeting the design requirements (tensile strength per unit area ≥ 20 N / mm2).
[0038] In view of this, as Figures 1-3 shown, on the one hand, an embodiment of the present application provides a busbar structure, including: a first busbar 100 configured with a first connection end 101; a second busbar 200 configured with a second connection end 201, the first connection end 101 overlapping the second connection end 201, and the overlapping portion of the first connection end 101 and the second connection end 201 is welded.
[0039] Exemplarily, the structures of the first busbar 100 and the second busbar 200 are not specifically limited, and the structural dimensions of the overlap between the first connection end 101 and the second connection end can be adjusted according to requirements such as tensile strength and fast charging.
[0040] In the above implementation process, the first busbar 100 overlaps with the second busbar 200, and the overlapping portion of the first busbar 100 and the second busbar 200 is welded. This can not only increase the overcurrent area and meet the thickness requirements for fast charging but also increase the tensile strength.
[0041] As Figure 3 shown, the first connection end 101 and the second connection end 201 are fixed by high-frequency resistance welding 400.
[0042] In the above implementation process, by adopting the mature high-frequency resistance welding 400 process for the first busbar 100 and the second busbar 200, it can not only increase the tensile strength but also save costs. Compared with the existing busbar structure, the weight is greatly reduced, and it has extremely high mass production value.
[0043] In some embodiments, the busbar structure further includes a fixing member 300, the fixing member 300 includes but is not limited to rivets, the fixing member 300 is disposed at the overlapping position of the first connection end 101 and the second connection end 201, and the fixing member 300 passes through the first connection end 101 and the second connection end 201.
[0044] In the above implementation process, the overlapping part of the first bus bar 100 and the second bus bar 200 is not only fixed by the mature high-frequency resistance welding 400 process, but also fixed by the fixing member 300 at the overlapping part. Under the dual fixing method, on the basis of ensuring cost reduction, the tensile strength of the welding position is increased, which has extremely high mass production value.
[0045] In some embodiments, the first connection end 101 is configured with a first fixing hole, the second connection end 201 is configured with a second fixing hole, the centers of the first fixing hole and the fixing hole are located on the same center line, and the fixing member 300 passes through the first fixing hole and the second fixing hole.
[0046] Exemplarily, for the convenience of fixing the first fixing hole, the second fixing hole and the fixing member 300, the first fixing hole can be configured in a stepped shape along the thickness direction of the first bus bar 100, and the second fixing hole can be configured in a stepped shape along the thickness direction of the second bus bar 200.
[0047] In the above implementation process, the fixing member 300 can fix the first bus bar 100 and the second bus bar 200 by passing through the first fixing hole and the second fixing hole, increasing the current-carrying capacity and the anti-tensile strength, meeting the requirements of fast charging.
[0048] In some embodiments, the fixing member 300 is exposed in the first fixing hole and the second fixing hole, and laser welding 500 is used at the contact positions of the fixing member 300 with the first fixing hole and the second fixing hole.
[0049] In the above implementation process, the fixing member 300 is respectively exposed in the first fixing hole and the second fixing hole, which can facilitate the welding of the fixing member 300 with the first bus bar 100 and the second bus bar 200 respectively, increasing the current-carrying capacity and the anti-tensile strength, meeting the requirements of fast charging.
[0050] In some embodiments, a plurality of the first fixing holes are configured, a plurality of the second fixing holes are configured, and each of the fixing holes corresponds to a second fixing hole. For example, two first fixing holes are configured, and the two first fixing holes are distributed along their length direction, two second fixing holes are configured, and correspondingly two fixing members 300 are configured.
[0051] In the above implementation process, by configuring a plurality of first fixing holes and second fixing holes, after the fixing member 300 passes through the first fixing hole and the second fixing hole, different positions of the first bus bar 100 and the second bus bar 200 can be fixed, increasing the current-carrying capacity and the anti-tensile strength, meeting the requirements of fast charging.
[0052] In some embodiments, the first bus bar 100 and the second bus bar 200 are made of the same material. For example, both the first bus bar 100 and the second bus bar 200 are made of 6101-T63 aluminum material.
[0053] In a second aspect, the present application further provides a battery pack, including: a plurality of battery modules, and the bus bar structure as described above, where the bus bar structure is connected to two adjacent battery modules.
[0054] In the battery module, the battery cells can be one or more. If there are multiple battery cells, the multiple battery cells can be connected in series, parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, parallel, or in a series-parallel combination, and then the whole formed by the multiple battery cells is accommodated in a box body; of course, it can also be that multiple battery cells are first connected in series, parallel, or in a series-parallel combination to form battery modules, and then the multiple battery modules are connected in series, parallel, or in a series-parallel combination to form a whole and are accommodated in the box body. The battery cells can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.
[0055] Among them, each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.
[0056] Since the battery pack provided in the second aspect includes the bus bar structure, the battery pack has all the technical effects of the bus bar structure, which will not be elaborated here.
[0057] In a third aspect, the present application further provides an electrical device, including the battery pack as described above.
[0058] Exemplarily, the battery pack is used to provide electrical energy for the electrical device, and the electrical device can be a vehicle, a portable device, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc.; the spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc. The embodiments of the present application do not make special limitations on the above electrical devices.
[0059] For the convenience of description in the following embodiments, a vehicle is taken as an example of an electrical device in an embodiment of the present application for illustration.
[0060] The interior of the vehicle is provided with a battery pack, which can be arranged at the bottom, head or tail of the vehicle. The battery pack can be used for power supply of the vehicle. For example, the battery pack can be used as the operating power source of the vehicle for the vehicle's circuit system, such as for the working power consumption requirements during vehicle starting, navigation and operation.
[0061] The vehicle may further include a controller and a motor. The controller is used to control the battery pack to supply power to the motor. For example, it is used for the working power consumption requirements during vehicle starting, navigation and driving.
[0062] In some embodiments of the present application, the battery pack can not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.
[0063] Since the electrical equipment provided by the third party includes a battery pack, the electrical equipment has all the technical effects of the battery pack, which will not be elaborated here.
[0064] In all embodiments of the present application, "big", "small" are relative, "many", "few" are relative, "up", "down" are relative. For the expression methods of such relative terms, the embodiments of the present application will not elaborate further.
[0065] It should be understood that "in this embodiment", "in the embodiments of the present application" or "as an optional implementation manner" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in this embodiment", "in the embodiments of the present application" or "as an optional implementation manner" that appear throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also know that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to the present application.
[0066] In various embodiments of the present application, it should be understood that the magnitudes of the serial numbers of the above processes do not necessarily mean the inevitable sequence of execution. The execution sequence of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
[0067] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present application, and all should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims
1. A busbar structure, characterized in that: include: A first bus bar is provided with a first connection end; The second bus is provided with a second connection end, wherein the first connection end is overlapped with the second connection end; A fixing member is arranged at a position where the first connection end and the second connection end overlap.
2. The busbar structure according to claim 1, characterized in that: The overlapping portion of the first connection end and the second connection end is welded.
3. The busbar structure according to claim 2, characterized in that: The first connection end and the second connection end are fixed by high-frequency resistance welding.
4. The busbar structure according to claim 3, characterized in that: The first connection end is configured with a first fixing hole, the second connection end is configured with a second fixing hole, the center of the first fixing hole and the center of the fixing hole are located on the same center line, and the fixing piece is penetrated through the first fixing hole and the second fixing hole.
5. The busbar structure according to claim 4, characterized in that: The fixing member is exposed in the first fixing hole and the second fixing hole, and the contact positions between the fixing member and the first fixing hole and the second fixing hole are laser welded.
6. The busbar structure according to claim 4 or 5, characterized in that: There are a plurality of the first fixing holes, and a plurality of the second fixing holes. Each of the fixing holes corresponds to a second fixing hole.
7. The busbar structure according to claim 1, characterized in that: The first bus bar and the second bus bar are made of the same material.
8. A battery pack, characterized in that: include: A battery module, wherein the battery module is configured with a plurality of; and The bus structure as described in any one of claims 1 to 7, wherein the bus structure is connected to two adjacent battery modules.
9. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 8.