Fusing connection assembly and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a fusing connection assembly and a battery pack, the fusing connection assembly is used for being connected in series with a position with the maximum total internal resistance in a main circuit of the battery pack, and comprises a plurality of aluminum wires, a first connection sheet and a second connection sheet; the aluminum wires are arranged on the first connecting sheet and the second connecting sheet in parallel; and the spacing distance between the first connecting sheet and the second connecting sheet is 4-6 mm. According to the utility model, the aluminum wires can be ensured to be quickly fused when the parameters such as the current value and the temperature of the battery core exceed rated values, and the whole module loop is disconnected, so that the fault diffusion is effectively prevented, and the false fusing caused by over-sensitivity of overlong aluminum wires and the delay of over-short aluminum wires in the fusing process can be avoided. In addition, the internal structure of the battery pack is more compact and reasonable. And the arrangement of other components in the battery pack is not interfered while the aluminum wires can fully play the role of the fuses, so that the overall performance and reliability of the battery pack are maintained.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and particularly relates to a fusing connection component and a battery pack. Background Art

[0002] At present, in the design of battery modules, aluminum or copper bars are generally used as conductive media to achieve series and parallel connections between battery cells. Although this design method performs well in terms of electrical conductivity, it also brings some potential problems. When a certain battery cell in the module experiences a short circuit, overheating, or internal failure, due to the high electrical conductivity and thermal stability of the aluminum or copper bar, the current may still flow to a certain extent, making it difficult for the faulty battery cell to immediately fuse to cut off the faulty circuit. This may not only exacerbate the damage to the faulty battery cell but also cause a chain reaction to the surrounding battery cells and even the entire battery module, increasing the safety risk.

[0003] To enhance the safety of battery modules, a common practice is to add fuses or fuses at the total positive and negative poles of the module. This design can quickly cut off the current by fusing the fuse when a serious fault occurs inside the module, preventing the spread of the fault. However, this approach also comes with a relatively high cost increase because high-quality fuses or fuses are expensive. At the same time, adding fuses also requires considering the re-layout of the internal structure of the module to ensure there is enough space to install these safety devices, which is especially a challenge for compactly designed battery modules. Summary of the Utility Model

[0004] To solve the deficiencies of the existing technology described above, the utility model provides a fusing connection component and a battery pack.

[0005] The technical effects to be achieved by the utility model are realized through the following technical aspects:

[0006] In the first aspect, the utility model provides a fusing connection component for being connected in series with the place where the total internal resistance in the main circuit of the battery pack is the largest, including: a plurality of aluminum wires, a first connecting piece, and a second connecting piece;

[0007] The first connecting piece and the second connecting piece are arranged at intervals. One side of the first connecting piece close to the second connecting piece is set as a first positioning part, and one side of the second connecting piece close to the first connecting piece is set as a second positioning part. One end of each aluminum wire is connected to the first positioning part, and the other end of each aluminum wire is connected to the second positioning part, and each aluminum wire is arranged in parallel;

[0008] Wherein, the interval distance between the first connecting piece and the second connecting piece is set to be 4 mm to 6 mm.

[0009] In some embodiments, the aluminum wire is provided with a stretching redundant part.

[0010] In some embodiments, the cross-sectional shape of the stretching redundancy portion is set to be arc-shaped or trapezoidal.

[0011] In some embodiments, a connecting portion is disposed to extend outward from the first connecting piece, and a positioning hole for positioning and installation is formed in the connecting portion.

[0012] In some embodiments, the first connecting piece and the second connecting piece are made of aluminum or copper.

[0013] In some embodiments, the diameter of each aluminum wire is set to 0.5 mm, and the over-current value at normal temperature is set to 6 A.

[0014] In a second aspect, the present utility model provides a battery pack, which includes the fuse connection assembly according to any one of the above embodiments, and further includes a housing, a cover body, and a plurality of battery modules disposed in the housing. The fuse connection assembly is connected in series between two adjacent battery modules with the largest total internal resistance, and the cover body is connected to the housing.

[0015] In some embodiments, a battery management system is further included. The battery management system is disposed in the housing and is connected to the plurality of battery modules.

[0016] In some embodiments, a shock-proof buffer is further included. The shock-proof buffer is installed in the housing to abut against the battery management system and the plurality of battery modules.

[0017] In some embodiments, the shock-proof buffer is set to be shock-proof filling sponge.

[0018] In summary, the present utility model has at least the following advantages:

[0019] A fuse connection component provided by the present utility model forms a fuse connection component by connecting a first connection piece and a second connection piece through a plurality of aluminum wires, and the fuse connection component is used to be connected in series with the place having the largest total internal resistance in the main circuit of the battery pack. In this way, when the fuse connection component is welded to the battery pack for use, the plurality of aluminum wires can be fused when the cell current value, temperature, etc. exceed the rated value. Compared with traditional fuses or fuses, the material cost of the aluminum wires is low, so the cost can be effectively reduced. At the same time, since the aluminum wire welding process can be directly carried out on the cell module, it does not occupy structural space. And when the distance between the first connection piece and the second connection piece is set to 4 mm to 6 mm, it can ensure that the aluminum wire is quickly fused when parameters such as the cell current value and temperature exceed the rated value, disconnecting the entire module circuit, thereby effectively preventing the spread of faults, and avoiding mis-fusing caused by overly sensitive too long aluminum wires and delays during the fusing process of too short aluminum wires. And the aluminum wires within this range are short in length, which can reduce the production cost while ensuring a better fusing effect. In addition, the internal structure of the battery pack is made more compact and reasonable. While ensuring that the aluminum wire can fully play the role of a fuse, it also ensures that the arrangement of other components inside the battery pack will not be disturbed, thereby maintaining the overall performance and reliability of the battery pack. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the fuse connection component of the embodiment of the present application in one direction;

[0021] Figure 2 It is a schematic structural diagram of the fuse connection component of the embodiment of the present application in another direction;

[0022] Figure 3 It is an exploded structural diagram of the battery pack of the embodiment of the present application;

[0023] Figure 4 It is a partial structural diagram of the battery pack of the embodiment of the present application.

[0024] Markings in the figure:

[0025] 10. Battery pack; 100. Fuse connection component; 110. First connection piece; 111. Positioning hole; 120. Second connection piece; 130. Aluminum wire; 131. Tensile redundant part; 200. Battery module; 300. Housing; 400. Cover; 500. Battery management system; 600. Shock-absorbing buffer. Detailed Embodiment

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The described embodiments are some, but not all, of the embodiments of the present utility model.

[0027] Therefore, the detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0028] Example 1:

[0029] As Figures 1 to 4 shown, in this embodiment, a fuse connection assembly 100 is used to be connected in series with the position having the largest total internal resistance in the main circuit of the battery pack 10, and includes: a plurality of aluminum wires 130, a first connection piece 110, and a second connection piece 120; the first connection piece 110 and the second connection piece 120 are arranged at intervals, a first positioning portion is arranged on the side of the first connection piece 110 close to the second connection piece 120, a second positioning portion is arranged on the side of the second connection piece 120 close to the first connection piece 110, one end of each aluminum wire 130 is connected to the first positioning portion, the other end of each aluminum wire 130 is connected to the second positioning portion, and each aluminum wire 130 is arranged in parallel in sequence; wherein, the interval distance between the first connection piece 110 and the second connection piece 120 is set to be 4 mm to 6 mm.

[0030] Specifically, both the first positioning portion and the second positioning portion are provided on the side of the first connecting piece 110 and the second connecting piece 120 facing away from the battery module 200. A plurality of aluminum wires 130 are arranged in parallel on the first connecting piece 110 and the second connecting piece 120. During production, each aluminum wire 130 is welded to the first connecting piece 110 and the second connecting piece 120. In this way, the two separated connecting pieces can be connected in a bridging manner through the respective aluminum wires 130. Then, the first connecting piece 110 and the second connecting piece 120 are respectively welded to two adjacent battery modules 200. When the battery pack 10 is under extreme working conditions, such as when the current value of the battery cell abnormally increases or the temperature rises sharply and exceeds its rated safety range, the aluminum wire 130 will quickly respond and fuse due to its relatively low melting point. Thus, it can timely disconnect the current loop of the entire module, effectively prevent the further deterioration of the faulty battery cell, and prevent it from having an adverse impact on other healthy battery cells. Among them, the spacing distance between the first connecting piece 110 and the second connecting piece 120 is set according to actual production requirements. For example, the spacing distance between the first connecting piece 110 and the second connecting piece 120 is set to 4 mm. Another example is that the spacing distance between the first connecting piece 110 and the second connecting piece 120 is set to 5 mm. Still another example is that the spacing distance between the first connecting piece 110 and the second connecting piece 120 is set to 6 mm.

[0031] It should be noted that a fuse connection assembly 100 is formed by connecting the first connecting piece 110 and the second connecting piece 120 through a plurality of aluminum wires 130, and the fuse connection assembly 100 is used to be connected in series with the point with the largest total internal resistance in the main circuit of the battery pack 10. In this way, when the fuse connection assembly 100 is welded to the battery pack 10 for use, the plurality of aluminum wires 130 can fuse when the current value, temperature, etc. of the battery cell exceed the rated value. Compared with traditional fuses or fuses, the cost of the aluminum wire 130 material is low, so the cost can be effectively reduced. At the same time, since the aluminum wire 130 welding process can be directly carried out on the battery cell module, it does not occupy structural space. And when the distance between the first connecting piece 110 and the second connecting piece 120 is set to 4 mm to 6 mm, it can ensure that the aluminum wire 130 quickly fuses when parameters such as the current value and temperature of the battery cell exceed the rated value, disconnecting the entire module circuit, thereby effectively preventing the spread of faults, and avoiding false fusing caused by overly sensitive too long aluminum wires 130 and delay during the fusing process of too short aluminum wires 130. In addition, the internal structure of the battery pack 10 is made more compact and reasonable. While ensuring that the aluminum wire 130 can fully play the role of a fuse, it also ensures that the arrangement of other components inside the battery pack 10 will not be disturbed, thus maintaining the overall performance and reliability of the battery pack 10.

[0032] To prevent the stretching during the expansion of the battery cell from affecting the fuse connection assembly 100, as Figure 2 shown, in some embodiments, the aluminum wire 130 is provided with a stretching redundant portion 131.

[0033] Specifically, by providing the stretching redundant part 131, there is a stretchable redundant length for the aluminum wire 130 when the battery cell expands, thus effectively preventing the aluminum wire 130 from being directly broken when the battery cell expands, and further effectively extending the service life of the aluminum wire 130. In this way, the practicability of the fuse connection assembly 100 is increased.

[0034] In order to facilitate the use of the aluminum wire 130, in some embodiments, the cross-sectional shape of the stretching redundant part 131 is set as an arc or a trapezoid.

[0035] Specifically, the cross-sectional shape of the stretching redundant part 131 is set according to actual production requirements. For example, referring to Figure 2 , the cross-sectional shape of the stretching redundant part 131 is set as an arc. The arc can be directly stretched and prepared by equipment according to a set track, and the production is simpler, so that while ensuring there is a stretchable space, the production cost can be reduced. For another example, the cross-sectional shape of the stretching redundant part 131 is set as an inverted V shape. For still another example, the cross-sectional shape of the stretching redundant part 131 is set as a trapezoid.

[0036] In order to facilitate the positioning of the fuse connection assembly 100, as shown in Figure 1 and Figure 4 , in some embodiments, the first connecting piece 110 extends outwardly to be provided with a connecting part, and a positioning hole 111 for positioning and installation is opened on the connecting part.

[0037] Specifically, a plastic-steel belt is wound around a plurality of battery modules 200, and positioning protrusions are provided on the plastic-steel belt. The positioning hole 111 is adapted to the positioning protrusions. Through the positioning function of the positioning hole 111, the position of the first connecting piece 110 is limited, so that the positioning effect is better and the fuse connection assembly 100 is prevented from shifting.

[0038] In some embodiments, the materials of the first connecting piece 110 and the second connecting piece 120 are aluminum or copper.

[0039] Specifically, the materials of the first connecting piece 110 and the second connecting piece 120 are set according to actual production requirements. For example, the materials of the first connecting piece 110 and the second connecting piece 120 are aluminum. In this way, as a light metal, aluminum has good electrical conductivity and thermal conductivity, and at the same time, the cost is relatively low, and it can effectively transmit current to meet the stable operation of the battery module 200 under high power requirements. For another example, the materials of the first connecting piece 110 and the second connecting piece 120 are copper. In this way, copper has excellent electrical conductivity and can provide lower resistance and higher efficiency when transmitting current.

[0040] Embodiment 2:

[0041] This embodiment is a further implementation of Embodiment 1. In this embodiment, the diameter of each aluminum wire 130 is set to 0.5 mm, the overcurrent value at normal temperature is set to 6 A, the number of aluminum wires 130 is set to 20, the widths of the first connecting piece 110 and the second connecting piece 120 are set to 20 mm, and the overcurrent capacity of the first connecting piece 110 and the second connecting piece 120 is set to 110 A.

[0042] It can be understood that the diameter, number, and overcurrent value of the aluminum wire 130 can also be set according to actual production requirements, and the specific parameters of the first connecting piece 110 and the second connecting piece 120 are correspondingly set in cooperation with the aluminum wire 130, which can be known to those skilled in the art and can be realized, and will not be described in detail in this embodiment.

[0043] Embodiment 3

[0044] In this embodiment, as Figure 3 and Figure 4 shown, a battery pack 10 is provided, which includes the fuse connection assembly 100 of Embodiment 1 or 2, and further includes a housing 300, a cover 400, and a plurality of battery modules 200 disposed in the housing 300. The fuse connection assembly 100 is connected in series to two adjacent battery modules 200 at the position with the largest total internal resistance, and the cover 400 is connected to the housing 300.

[0045] Specifically, the aluminum busbar and the copper busbar are connected in series and parallel to the plurality of battery modules 200 according to actual production requirements, and the fuse connection assembly 100 is connected in series to two battery modules 200 at the position with the largest total internal resistance, that is, the fuse connection assembly 100 is connected to the most central position of the series-parallel connection of the module circuit, so as to ensure that the aluminum wire 130 quickly melts when parameters such as the cell current value and temperature exceed the rated value, disconnecting the entire module circuit, thereby effectively preventing the spread of faults, and avoiding mis-melting caused by overly sensitive long aluminum wires 130, as well as the delay during the melting process of short aluminum wires 130. In addition, the internal structure of the battery pack 10 is made more compact and reasonable. While ensuring that the aluminum wire 130 can fully play the role of a fuse, it also ensures that the arrangement of other components inside the battery pack 10 will not be disturbed, thus maintaining the overall performance and reliability of the battery pack 10.

[0046] As Figure 3 shown, in some embodiments, the battery pack 10 further includes a battery management system 500, and the battery management system 500 is disposed in the housing 300 and connected to the plurality of battery modules 200.

[0047] Specifically, by providing the battery management system 500, the battery cells can be monitored and protected, thereby effectively increasing the practicability of the battery pack 10.

[0048] It can be understood that the battery management system 500, i.e., BMS, as a key component for monitoring and protecting the battery module 200, although its input end is designed with monitoring functions, in actual operation, if a fault occurs inside the battery module 200 and this fault is not directly reflected in parameters such as voltage, current, or temperature that the battery management system 500 can immediately capture, the battery management system 500 may be difficult to quickly identify and report the abnormality. This delayed detection time may lead to a decline in the performance of the battery system and even cause more serious safety problems.

[0049] And through the structure of the fuse connection component 100 of the present application, an additional insurance device can be provided to better protect the safety of the circuit.

[0050] Such as Figure 3 As shown, in some embodiments, the battery pack 10 further includes a shock-absorbing buffer member 600, and the shock-absorbing buffer member 600 is installed in the housing 300 to abut against the battery management system 500 and the plurality of battery modules 200.

[0051] Specifically, by providing the shock-absorbing buffer member 600 in the housing 300, it can play multiple roles such as shock absorption, heat insulation and heat preservation, support and fixation, flame retardancy, and dust and water prevention, thereby effectively increasing the practicability of the battery pack 10 and ensuring the safety and reliability of the battery pack 10.

[0052] In some embodiments, the shock-absorbing buffer member 600 is set as a shock-absorbing filling sponge.

[0053] Specifically, through its good buffering performance, the shock-absorbing filling sponge can effectively absorb the vibration and impact energy, thereby protecting the components inside the battery pack 10 from damage; and it can isolate the direct contact between the battery module 200 and the external environment, reducing heat dissipation or intrusion of external heat, thereby maintaining the battery module 200 and the battery management system 500 within a suitable working temperature range; it can also fill the gaps between the battery module 200, the battery management system 500 and the housing 300, making the battery module 200 and the battery management system 500 more firmly fixed in the battery pack 10; in extreme cases such as thermal runaway or fire of the battery module 200, the flame-retardant shock-absorbing filling sponge can prevent the spread of fire and prevent external debris such as dust and moisture from entering the interior.

[0054] In some embodiments, the shock-absorbing filling sponge is set as a cube.

[0055] In another embodiment, the surface of the shock-absorbing filling sponge is provided with a wavy abutting surface, thereby effectively enhancing its buffering effect.

[0056] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "attachment", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0057] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0058] In addition, terms such as "horizontal", "vertical", "hanging", etc. do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0059] In the present utility model, unless otherwise clearly specified and defined, the first feature being above or below the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being above, over and on the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, under and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0060] Although the description of the present utility model is carried out in combination with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes based on the above content. Therefore, all such substitutions, improvements and changes are included within the spirit and scope of the appended claims.

Claims

1. A fuse connection assembly, used to be connected in series with a point where the total internal resistance in a main circuit of a battery pack (10) is the largest, characterized in that: include: A plurality of aluminum wires (130), a first connecting piece (110) and a second connecting piece (120); The first connecting piece (110) and the second connecting piece (120) are arranged at intervals, a side of the first connecting piece (110) close to the second connecting piece (120) is arranged as a first positioning portion, a side of the second connecting piece (120) close to the first connecting piece (110) is arranged as a second positioning portion, one end of each of the aluminum wires (130) is connected to the first positioning portion, and the other end of each of the aluminum wires (130) is connected to the second positioning portion, and each of the aluminum wires (130) is arranged in parallel; Wherein, the spacing distance between the first connecting piece (110) and the second connecting piece (120) is set to be 4 mm to 6 mm.

2. The fusible connection assembly according to claim 1, characterized in that: The aluminum wire (130) is provided with a tensile redundant portion (131).

3. The fusible connection assembly according to claim 2, characterized in that: The cross-sectional shape of the stretching redundant portion (131) is set to be an arc or a trapezoid.

4. The fusible connection assembly according to claim 1, characterized in that: The first connecting piece (110) is provided with a connecting portion extending outwardly, and a positioning hole (111) for positioning and installation is provided on the connecting portion.

5. The fusible connection assembly according to claim 1, characterized in that: The first connecting plate (110) and the second connecting plate (120) are made of aluminum or copper.

6. The fusible connection assembly according to claim 1, characterized in that: The diameter of each aluminum wire (130) is set to 0.5 mm, and the overcurrent value at room temperature is set to 6A.

7. A battery pack, comprising the fusible connection assembly (100) according to any one of claims 1 to 6, characterized in that: It also includes a shell (300), a cover (400), and a plurality of battery modules (200) arranged in the shell (300); the fuse connection assembly (100) is connected in series to two adjacent battery modules (200) at the location where the total internal resistance is the largest; and the cover (400) is connected to the shell (300).

8. The battery pack according to claim 7, characterized in that: It also includes a battery management system (500), which is arranged in the housing (300) and connected to the plurality of battery modules (200).

9. The battery pack according to claim 8, characterized in that: It also includes a shockproof buffer (600), which is installed in the housing (300) to abut against the battery management system (500) and the plurality of battery modules (200).

10. The battery pack according to claim 9, characterized in that: The shockproof buffer (600) is configured as a shockproof filling sponge.

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