Battery pack

Abstract

The utility model discloses a battery pack which comprises a plurality of single batteries, a plurality of connecting aluminum rows and at least two switching aluminum rows, the single batteries are electrically connected through the connecting aluminum rows, and each connecting aluminum row is provided with a test switching hole; the switching aluminum bars and the test switching holes are detachably connected and conducted, and different switching aluminum bars are connected to different connecting aluminum bars. According to the battery pack, the problems of short circuit risk, aluminum scrap residue hidden danger and structural damage caused by aluminum row prying and drilling in a traditional method are effectively avoided, and the safety, the reliability and the operation convenience of a thermal runaway test are improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a battery pack. Background Technology

[0002] With the widespread application of battery energy storage systems, thermal runaway testing of lithium-ion battery packs has become an indispensable step in evaluating their safety performance. By simulating the development process of thermal runaway in individual battery cells, the effectiveness of the thermal management design and protection mechanism of the battery pack can be verified, which is of great significance for ensuring the reliability of electric vehicles and energy storage systems.

[0003] Current industry-standard thermal runaway testing methods typically require physical modifications to the battery pack's connecting aluminum busbars. For example, to connect test leads, operators may need to pry open or cut sections of the connecting aluminum busbars to create temporary interfaces, or directly weld external wires onto the surface of the aluminum busbars to connect to the test power supply.

[0004] Such operations are not only cumbersome but can also lead to deformation or damage to the connecting aluminum busbars, or damage to the terminal connections of adjacent individual cells due to prying or high-temperature welding, causing problems such as increased contact resistance and distorted electrical signal acquisition. Furthermore, some testing scenarios require repeated drilling or welding at different locations on the aluminum busbars, which not only damages the busbar structure and increases the risk of breakage but also degrades the accuracy of battery thermal runaway test data. Therefore, a battery pack structure that facilitates the input and sampling of test electrical signals is needed. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that addresses the technical problem of the difficulty in conducting thermal runaway tests on battery packs.

[0006] To achieve the above objectives, the present invention provides a solution as follows: a battery pack comprising: multiple individual batteries, multiple connecting aluminum busbars, and at least two adapter aluminum busbars. The individual batteries are electrically connected through the connecting aluminum busbars, and each connecting aluminum busbar has a test adapter hole. The adapter aluminum busbars are detachably connected to and conductive with the test adapter holes, and different adapter aluminum busbars are connected to different connecting aluminum busbars.

[0007] According to one embodiment of the present invention, the adapter aluminum busbar includes a first part and a second part that are connected to each other. The first part is detachably connected to the test adapter hole, and the end of the second part away from the first part extends in a direction away from the individual battery.

[0008] According to one embodiment of the present invention, the first part extends outward from the connecting aluminum busbar at one end near the second part, and the projections of the second part and the connecting aluminum busbar do not overlap on the side of the single cell near the connecting aluminum busbar.

[0009] According to one embodiment of the present invention, the first part is attached to the connecting aluminum strip part, and the first part is perpendicular to the second part.

[0010] According to one embodiment of the present invention, two sets of test adapter holes are provided on each connecting aluminum busbar, and the two sets of test adapter holes are respectively located close to a single battery cell connected to the connecting aluminum busbar.

[0011] According to one embodiment of the present invention, the connecting aluminum busbar includes two connecting portions communicating with individual batteries, and the test adapter hole is located on one side of the connecting portion away from the other connecting portion, or the test adapter hole is located on one side of the line connecting the two connecting portions.

[0012] According to one embodiment of the present invention, the test adapter hole is a threaded hole, and the battery pack also includes a connecting screw. A connecting hole is provided on the adapter aluminum busbar corresponding to the test adapter hole, and the connecting screw passes through the connecting hole and is threadedly engaged with the test adapter hole.

[0013] According to one embodiment of the present invention, each adapter aluminum busbar is connected to the connecting aluminum busbar by two connecting screws, the nominal diameter of which is one or more of 3mm, 4mm or 6mm.

[0014] According to one embodiment of the present invention, a test hole is provided at the end of the adapter aluminum busbar away from the connecting aluminum busbar. The battery pack also includes a test screw and a test nut. The test screw passes through the test hole and cooperates with the test nut to clamp the test input wire.

[0015] According to one embodiment of the present invention, the connecting aluminum busbar is welded to the individual battery cell.

[0016] The beneficial effects of this utility model are as follows:

[0017] The battery pack provided in this application includes multiple individual cells, multiple connecting aluminum busbars, and at least two adapter aluminum busbars. The multiple individual cells are electrically connected via the connecting aluminum busbars, each of which has a test adapter hole. The adapter aluminum busbars are detachably connected to and conductively connected to the test adapter holes, and different adapter aluminum busbars are connected to different connecting aluminum busbars, thus providing a convenient and stable electrical interface for external test leads during thermal runaway testing.

[0018] By designing the test adapter holes, operators can perform thermal runaway tests without modifying the connecting aluminum busbars, such as by prying or drilling. Instead, they can quickly connect to the adapter aluminum busbars via the pre-set test adapter holes, facilitating a non-invasive connection of the test leads. This effectively avoids the short-circuit risks, aluminum shavings residue, and structural damage associated with prying and drilling the aluminum busbars in traditional methods, thus improving the safety, reliability, and ease of operation of thermal runaway testing. Compared to existing technologies, this utility model's battery pack, by pre-setting standardized test adapter holes on the connecting aluminum busbars and using adapter aluminum busbars for detachable connections, eliminates the safety hazards and process complexity associated with on-site modification of the aluminum busbars in existing technologies. It also avoids damage to the aluminum busbar structure and deterioration of test data, significantly reducing labor costs and processing difficulty, and improving the overall efficiency and safety of thermal runaway testing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in the embodiments of this application;

[0021] Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle;

[0022] Figure 3 This is a schematic diagram of the overall structure of the adapter aluminum bus provided in the embodiments of this application.

[0023] Explanation of icon numbers:

[0024] 10. Single cell; 20. Connecting aluminum busbar; 21. Test adapter hole; 22. Connecting part; 30. Adapter aluminum busbar; 31. First part; 32. Second part; 33. Connecting hole; 34. Test hole; 40. Connecting screw; 51. Test screw; 52. Test nut; 60. Test input wire. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] With the widespread application of battery energy storage systems in electric vehicles and energy storage, the safety performance of lithium-ion batteries has received increasing attention. Among these, battery pack thermal runaway testing is an important means of evaluating the safety characteristics and effectiveness of protection designs of battery systems. By simulating the occurrence and development process of thermal runaway in individual battery cells, the rationality of the battery pack's thermal management structure and protection mechanisms can be effectively verified, which is of great significance for ensuring the safety and reliability of electric vehicles and energy storage systems.

[0027] However, current industry-standard battery pack thermal runaway testing methods typically require on-site physical modifications to the battery connecting aluminum busbars. For example, to allow the connection of external test leads, it is usually necessary to pry or cut the connecting aluminum busbars to create temporary interfaces, or directly weld external leads onto the surface of the aluminum busbars for electrical connection. These methods are not only complex and time-consuming, but also prone to deformation and damage to the connecting aluminum busbars. Furthermore, prying or high-temperature welding may damage the connection between the aluminum busbar and the battery terminals, leading to increased contact resistance and distorted electrical signal acquisition. In addition, in some complex testing processes, repeated drilling or welding at different locations on the aluminum busbar may be necessary, further compromising the structural integrity of the aluminum busbar, increasing the risk of breakage, and degrading the accuracy and stability of the thermal runaway test data.

[0028] Therefore, there is an urgent need for a new type of battery pack structure that can easily realize electrical signal access and sampling, and can overcome the above problems when sampling tests are required.

[0029] Please see Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the overall structure of the battery pack provided in the embodiments of this application; Figure 2 yes Figure 1 A magnified view of a portion of region A in the middle; Figure 3 This is a schematic diagram of the overall structure of the adapter aluminum busbar 30 provided in the embodiments of this application.

[0030] To solve the above-mentioned technical problems, this utility model provides a battery pack, which includes: multiple individual batteries 10, multiple connecting aluminum busbars 20 and at least two adapter aluminum busbars 30. The individual batteries 10 are electrically connected through the connecting aluminum busbars 20, and each connecting aluminum busbar 20 is provided with a test adapter hole 21. The adapter aluminum busbars 30 are detachably connected to and conductive with the test adapter holes 21, and different adapter aluminum busbars 30 are connected to different connecting aluminum busbars 20.

[0031] Each connecting aluminum busbar 20 of the battery pack provided in this embodiment is pre-equipped with a test adapter hole 21. The adapter aluminum busbar 30 is detachably connected to and conducts electricity with the connecting aluminum busbar 20 through the test adapter hole 21. Different adapter aluminum busbars 30 are connected to different connecting aluminum busbars 20, thereby forming at least two independent external test interfaces. When testing is required, the adapter aluminum busbar 30 is connected to the connecting aluminum busbar 20 through the test adapter hole 21, and then the external test input wire 60 is fixed to the end of the adapter aluminum busbar 30 away from the connecting aluminum busbar 20. This allows for quick connection of the thermal runaway test wire without requiring on-site modification of the connecting aluminum busbar 20.

[0032] Through the above structural design, this embodiment of the invention enables rapid and stable input and acquisition of electrical signals during thermal runaway testing. Since the adapter aluminum busbar 30 and the connecting aluminum busbar 20 are detachably connected via a pre-set standardized test adapter hole 21, operators do not need to pry the aluminum busbar or use destructive methods such as drilling during thermal runaway testing. Instead, they can quickly install and remove the adapter aluminum busbar 30 on-site to connect and disconnect the external test leads. The entire operation is simple and safe, significantly reducing the labor intensity and operational risks for testing personnel. Compared to the traditional method in the prior art that requires on-site destruction of the connecting aluminum busbar 20, this embodiment of the invention, through the combined structural design of the connecting aluminum busbar 20 and the adapter aluminum busbar 30, completely eliminates the risks of aluminum busbar deformation, aluminum shavings residue, and short circuits caused by prying and drilling. It avoids damage to the battery cell connection structure and errors in electrical signal acquisition, effectively ensuring the accuracy and reliability of thermal runaway test data. Simultaneously, since no destructive processing is required on-site, labor costs and processing difficulty are significantly reduced, improving the overall testing efficiency, safety, and reliability of the battery pack.

[0033] It should be understood that although this application is an improvement on the quick wiring and sampling for thermal runaway testing, the battery pack of this application also has all the structures that a complete battery pack should have, and can also realize functions such as charging and discharging. The battery pack of this application cannot be simply defined as a testing device.

[0034] According to one embodiment of the present invention, the adapter aluminum busbar 30 includes a first part 31 and a second part 32 that are connected to each other. The first part 31 is detachably connected to the test adapter hole 21, and the end of the second part 32 away from the first part 31 extends in a direction away from the single cell 10.

[0035] In this embodiment, the adapter aluminum busbar 30 includes a first part 31 and a second part 32 connected to each other. The end of the second part 32 away from the first part 31 extends in a direction away from the individual battery 10. This ensures that the second part 32 maintains the largest possible spatial distance from the individual battery 10 after installation, effectively reducing potential interference to the battery cells during testing. Furthermore, the structure of the first part 31 and the second part 32 also reduces the difficulty of test wiring and electrical signal acquisition, improving the convenience and safety of test operations.

[0036] Furthermore, the end of the first part 31 near the second part 32 extends outward from the connecting aluminum busbar, and the projections of the second part 32 and the connecting aluminum busbar 20 do not overlap on the side of the single cell 10 near the connecting aluminum busbar 20.

[0037] In this embodiment, the end of the first part 31 near the second part 32 extends outward from the connecting aluminum busbar. The projections of the second part 32 and the connecting aluminum busbar 20 do not overlap on the side of the single cell 10 near the connecting aluminum busbar 20. That is, the first part 31 extends between the two single cells 10, and the projection of the second part 32 falls on the gap between the two adjacent connecting aluminum busbars 20. This further moves the second part 32 away from the area where the connecting aluminum busbar 20 and the single cell 10 are connected, further reducing the impact of connecting the test input wire 60 on the performance of the single cell 10 on the connecting aluminum busbar 30; it also prevents installation inconvenience caused by overlapping projections, further improving the work efficiency and accuracy during the testing process.

[0038] Optionally, the first part 31 is partially attached to the connecting aluminum strip 20, and the first part 31 is perpendicular to the second part 32.

[0039] In this embodiment, the first part 31 and the second part 32 are arranged perpendicularly, allowing the second part 32 to extend more fully away from the individual battery 10, thereby further increasing the distance between the test wire connection point on the second part 32 and the body of the individual battery 10. Specifically, since the first part 31 is horizontally attached to the connecting aluminum busbar 20, the perpendicular relationship between the first part 31 and the second part 32 means that the second part 32 extends in a direction perpendicular to the surface of the connecting aluminum busbar 20. The connection point of the test wire can be arranged further away from the surface of the individual battery 10 and its conductive area. This layout not only effectively reduces the interference of the electromagnetic field at the wire connection point on the individual battery 10, but also helps to avoid the impact of electrical or heat conduction that may occur during the test on the internal structure and performance of the battery.

[0040] According to one embodiment of the present invention, two sets of test adapter holes 21 are provided on each connecting aluminum busbar 20, and the two sets of test adapter holes 21 are respectively located close to a single battery 10 connected to the connecting aluminum busbar 20.

[0041] In this embodiment, each connecting aluminum busbar 20 is provided with two sets of test adapter holes 21, and the two sets of test adapter holes 21 are arranged close to the areas of the two individual cells 10 connected to the connecting aluminum busbar 20, so that each individual cell 10 can be tested or monitored by a corresponding set of adapter holes nearby. This effectively shortens the signal transmission path between the test wire and the individual cell 10, reduces the loss and interference risk in the signal transmission process, and thus realizes more direct and accurate signal acquisition in the battery testing process, improving the accuracy and reliability of the test data.

[0042] Furthermore, by opening two sets of test adapter holes 21 on the connecting aluminum busbar 20 and placing them adjacent to two individual cells 10 respectively, a more compact and orderly test wiring layout can be achieved inside the battery pack. This avoids installation difficulties and test errors caused by crossed or excessively long test wires, improving the convenience, safety, and efficiency of test operations. Moreover, this design can reduce mutual interference between test wires and between the wires and surrounding components, which is beneficial to improving the test environment and ensuring the stability and accuracy of test results.

[0043] According to one embodiment of the present invention, the connecting aluminum busbar 20 includes two connecting portions 22 that communicate with the individual battery 10. The test adapter hole 21 is disposed on one side of the connecting portion 22 away from the other connecting portion 22, or the test adapter hole 21 is disposed on one side of the line connecting the two connecting portions 22.

[0044] The connecting aluminum busbar 20 plays a role in conducting electricity and carrying current in the battery pack. Its two connecting parts 22 are connected to the adjacent single cell 10 to form a current path. In this embodiment, the test adapter hole 21 is opened at a position far away from the main current path, which effectively avoids opening a hole in the core area of ​​the current path of the connecting aluminum busbar 20, thereby reducing the impact of the hole on the current carrying cross-sectional area of ​​the connecting aluminum busbar 20, avoiding the reduction of current carrying capacity or the increase of resistance, and ensuring the original current carrying performance and conductivity of the connecting aluminum busbar 20.

[0045] According to one embodiment of the present invention, the test adapter hole 21 is a threaded hole, and the battery pack also includes a connecting screw 40. The adapter aluminum busbar 30 is provided with a connecting hole 33 corresponding to the test adapter hole 21, and the connecting screw 40 passes through the connecting hole 33 and is threadedly engaged with the test adapter hole 21.

[0046] This embodiment provides a specific structure for the test adapter hole 21. By connecting the screw 40 through the connecting hole 33 and threading it into the test adapter hole 21, the connection between the adapter aluminum busbar 30 and the connecting aluminum busbar 20 is firm and reliable, and has detachability, which facilitates assembly, disassembly and daily maintenance operations, thereby improving the practicality of the entire battery pack test structure.

[0047] Furthermore, each adapter aluminum busbar 30 is connected to the connecting aluminum busbar 20 by two connecting screws 40, the nominal diameter of which is one or more of 3mm, 4mm or 6mm.

[0048] This embodiment further improves the safety and stability of the connection structure by employing a two-point connection method with two connecting screws 40. On the one hand, the two connecting screws 40 make the connection between the aluminum busbar 20 and the adapter aluminum busbar 30 more stable, resulting in a larger current-carrying area. On the other hand, the fixing of the two connecting screws 40 prevents the adapter aluminum busbar 30 from rotating, making the current-carrying surface shape more stable. At the same time, this embodiment provides a variety of preferred screw diameters, allowing for flexible adjustment according to actual current-carrying requirements or installation space.

[0049] According to one embodiment of the present invention, the adapter aluminum busbar 30 has a test hole 34 at the end away from the connecting aluminum busbar 20. The battery pack also includes a test screw 51 and a test nut 52. The test screw 51 passes through the test hole 34 and cooperates with the test nut 52 to clamp the test input wire 60.

[0050] This embodiment provides a specific connection structure between the test lead and the adapter aluminum busbar 30. A test hole 34 is provided at the end of the adapter aluminum busbar 30 furthest from the connecting aluminum busbar 20. A test screw 51 passes through this test hole 34 and engages with a test nut 52, thereby clamping the test input lead 60. This connection method is simple to operate, provides a stable connection, facilitates the quick installation and removal of the test input lead 60, and improves the convenience and reliability of testing.

[0051] According to one embodiment of the present invention, the connecting aluminum busbar 20 is welded to the single battery cell 10.

[0052] Compared to traditional methods that require prying the aluminum busbars, the technical solution of this application eliminates the need for prying, thus avoiding the risk of mechanical deformation or loosening. Therefore, this embodiment employs welding connections, resulting in a more stable and reliable battery pack circuit with lower contact resistance, thereby effectively improving the reliability and safety of the battery pack connection.

[0053] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indicator will also change accordingly.

[0054] It should also be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0055] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0056] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the design concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: Multiple individual battery cells; Multiple connecting aluminum busbars are provided, through which the individual cells are electrically connected, and each connecting aluminum busbar is provided with a test adapter hole; At least two adapter aluminum busbars are provided, which are detachably connected to and conductive to the test adapter hole, and different adapter aluminum busbars are connected to different connecting aluminum busbars.

2. The battery pack according to claim 1, characterized in that, The adapter aluminum busbar includes a first part and a second part that are connected to each other. The first part is detachably connected to the test adapter hole, and the end of the second part away from the first part extends in a direction away from the single cell.

3. The battery pack according to claim 2, characterized in that, The first part extends outward from the connecting aluminum busbar at one end near the second part, and the projections of the second part and the connecting aluminum busbar do not overlap on the side of the single cell near the connecting aluminum busbar.

4. The battery pack according to claim 2, characterized in that, The first part is attached to the connecting aluminum busbar portion, and the first part is perpendicular to the second part.

5. The battery pack according to claim 1, characterized in that, Two sets of test adapter holes are provided on each of the connecting aluminum busbars, and the two sets of test adapter holes are respectively located near one of the individual cells connected to the connecting aluminum busbar.

6. The battery pack according to claim 1, characterized in that, The connecting aluminum busbar includes two connecting parts that communicate with the individual battery cells. The test adapter hole is located on one of the connecting parts away from the other connecting part, or the test adapter hole is located on one side of the line connecting the two connecting parts.

7. The battery pack according to any one of claims 1-6, characterized in that, The test adapter hole is a threaded hole, and the battery pack also includes a connecting screw. The adapter aluminum busbar has a connecting hole corresponding to the test adapter hole, and the connecting screw passes through the connecting hole and is threaded into the test adapter hole.

8. The battery pack according to claim 7, characterized in that, Each of the adapter aluminum busbars is connected to the connecting aluminum busbar by two connecting screws, the connecting screws having a nominal diameter of 3mm, 4mm or 6mm or one or more.

9. The battery pack according to any one of claims 1-6, characterized in that, The adapter aluminum busbar has a test hole at one end away from the connecting aluminum busbar. The battery pack also includes a test screw and a test nut. The test screw passes through the test hole and cooperates with the test nut to clamp the test input wire.

10. The battery pack according to any one of claims 1-6, characterized in that, The connecting aluminum busbar is welded to the individual battery cell.

Images