Energy storage battery box and fuse assembly thereof

Abstract

The utility model discloses an energy storage battery box and a fuse assembly thereof, and relates to the power-off safety protection switch technology field, the fuse assembly comprises a fuse and an over-current row, the over-current row is used for accessing into a circuit of the energy storage battery box, the over-current row is provided with a metal support for installing the fuse, the over-current row is provided with a gap segment, and the gap segment is provided with an opening. The sum of the maximum current-carrying capacity of the gap section and the rated current of the fuse is equal to the overcurrent value of the circuit. The fuse assembly can reduce the cost of the fuse and improve the reliability of overload protection while meeting the requirement of the energy storage battery box for processing large current.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of power-off safety protection switch, more particularly to a fuse assembly. In addition, the utility model relates to an energy storage battery box comprising the above-mentioned fuse assembly. BACKGROUND

[0002] The energy storage battery box is a device for storing and releasing electric energy, and has a plurality of battery units inside. In order to ensure safety, the energy storage battery pack needs a fuse because the battery may have abnormal conditions such as overcharging, overdischarging, and short circuit. The main function of the fuse is to disconnect the circuit when the battery unit has an abnormal condition such as overdischarge or overcharge, at which time the current exceeds the safety threshold, and the fuse melts the fuse body by generating heat, thereby protecting the battery system from damage caused by overloading and short circuit.

[0003] The existing energy storage battery box usually needs to handle large current to meet the demand of large-scale energy storage and fast charging and discharging. Therefore, the existing energy storage battery box needs to be matched with a fuse with large rated current to protect the circuit. However, the fuse with large rated current is difficult to manufacture and has high cost, which in turn results in high cost of the energy storage battery box.

[0004] Therefore, how to reduce the cost of the fuse in the existing energy storage battery box is a problem that needs to be solved by the technical personnel in the field at present. SUMMARY

[0005] Therefore, the purpose of the utility model is to provide a fuse assembly which can meet the demand of the energy storage battery box handling large current while reducing the cost of the fuse.

[0006] Another purpose of the utility model is to provide an energy storage battery box comprising the above-mentioned fuse assembly, which has low cost.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A fuse assembly comprises a fuse and an overcurrent bar, the overcurrent bar is used to access the circuit of an energy storage battery box, the overcurrent bar is provided with a metal bracket for mounting the fuse, and the overcurrent bar is provided with a notched section, the sum of the maximum carrying capacity of the notched section and the rated current of the fuse is equal to the overcurrent value of the circuit.

[0009] Preferably, the notched section is located in the middle of the overcurrent bar.

[0010] Preferably, the middle of the overcurrent bar is symmetrically provided with a U-shaped notch along the width direction of the overcurrent bar, and the plate body between the two notches is the notched section.

[0011] Preferably, the fuse is arranged at one end of the metal support away from the overcurrent bar to leave an electrical gap between the overcurrent bar.

[0012] Preferably, the overcurrent bar comprises a support plate and two connecting plates integrally connected with two ends of the support plate, and the metal support is arranged on the support plate.

[0013] Preferably, the metal support comprises two connecting pieces each in L shape, vertical segments of the two connecting pieces are respectively sleeved with two ends of the fuse, and horizontal segments of the two connecting pieces are arranged on the support plate through metal fasteners.

[0014] Preferably, the horizontal segment of the connecting piece is provided with a first mounting hole, the support plate is provided with a second mounting hole opposite to the first mounting hole, and the metal fastener is threadedly connected to the second mounting hole through the first mounting hole.

[0015] Preferably, the metal fastener comprises a first clamping part and a second clamping part matched in clamping, the first clamping part is arranged on the horizontal segment of the connecting piece, and the second clamping part is arranged on the support plate.

[0016] Preferably, the overcurrent bar is in a U-shaped structure.

[0017] An energy storage battery box comprising the fuse assembly.

[0018] The fuse assembly provided by the utility model, the fuse is installed on the overcurrent bar through the metal support, the overcurrent bar is connected into the circuit of the energy storage battery box, the overcurrent bar and the fuse are connected in parallel in the circuit, the overcurrent bar can share the current in the circuit, so that the low-current fuse can be selected while meeting the demand of the energy storage battery box for processing large current, and the cost of the fuse is reduced.

[0019] It should be noted that the overcurrent bar is connected into the circuit, and it can be easily concluded that the maximum carrying capacity of the two end portions of the overcurrent bar connected to the circuit is not less than the overcurrent value of the circuit (i.e. the maximum current value allowed to pass through the energy storage battery box in normal charging and discharging operation), if it is desired to ensure the effectiveness of the overload protection of the fuse assembly, the overcurrent bar is provided with a notch section, obviously, the cross-sectional area of the notch section is smaller than that of the main body of the overcurrent bar, and the maximum carrying capacity of the notch section can be designed when the notch section is processed (in a proportional relationship with the cross-sectional area), thus, the rated current of the selectable fuse can be determined according to the difference between the overcurrent value of the circuit and the maximum carrying capacity of the notch section, in this way, when the current in the circuit exceeds the overcurrent value, the fuse and the notch section of the overcurrent bar are both fused, thereby cutting off the circuit.

[0020] In summary, the fuse assembly provided by the utility model can meet the demand of the energy storage battery box for processing large current, reduce the cost of the fuse, and improve the reliability of overload protection. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of the provided drawings.

[0022] Figure 1 The structural diagram of the energy storage battery box provided by the present application is shown in the figure.

[0023] Figure 2 For Figure 1 The local enlarged view at A in the figure.

[0024] Figure 3 The structural diagram of the fuse assembly provided by the present application is shown in the figure.

[0025] Figure 4 The exploded view of the fuse assembly provided by the present application is shown in the figure.

[0026] Reference signs:

[0027] 1-fuse; 2-overcurrent row; 21-supporting plate; 211-notched section; 22-connection plate; 3-metal support; 4-metal fastener; 5-battery module; 6-box. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments only represent some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0029] The core of the present application is to provide a fuse assembly which can meet the demand of handling large current of the energy storage battery box while reducing the cost of the fuse.

[0030] Another core of the present application is to provide an energy storage battery box comprising the above-mentioned fuse assembly, which is low in cost.

[0031] It should be noted that in the present embodiment, "first", "second" and "third" are only used for describing advantages, and cannot be understood as indicating or implying relative importance.

[0032] Please refer to Figure 2 and Figure 3The utility model provides a kind of fuse assembly, including fuse 1 and overcurrent bar 2, overcurrent bar 2 is used to access the circuit of energy storage battery box, overcurrent bar 2 is equipped with the metal support 3 of installing fuse 1, and overcurrent bar 2 is equipped with notch section 211, and the sum of the maximum current-carrying capacity of notch section 211 and the rated current of fuse 1 is equal to the overcurrent value of circuit.

[0033] Specifically, the two ends of overcurrent bar 2 are connected to the circuit of energy storage battery box, and overcurrent bar 2 is made of metal material to meet the demand of transmitting current. The metal support 3 is installed on overcurrent bar 2, and fuse 1 is installed on metal support 3. Metal support 3 can play the role of conducting electricity, so that fuse 1 and overcurrent bar 2 are connected in parallel in the circuit. It can be understood that the parallel fuse 1 and overcurrent bar 2 jointly bear the current in the circuit. Since overcurrent bar 2 shares the current in the circuit, fuse 1 can be selected as a low-current fuse 1, thereby reducing the cost of fuse 1 while meeting the demand of energy storage battery box for handling large current.

[0034] It should be noted that the overcurrent value of the circuit refers to the maximum current value allowed to pass through the energy storage battery box during normal charging and discharging. The rated current of fuse 1 refers to the maximum current that fuse 1 can withstand in normal working condition. When the current in the circuit exceeds the rated current of fuse 1, the fuse of fuse 1 will melt. In addition, the selection of fuse 1 is usually 1.2-1.5 times the rated current to ensure sufficient protection when the load changes.

[0035] It should be noted that overcurrent bar 2 is connected to the circuit, and it is not difficult to conclude that the maximum current-carrying capacity of the two ends of overcurrent bar 2 connected to the circuit is not less than the overcurrent value of the circuit. However, when the current of the circuit exceeds the overcurrent value, overcurrent bar 2 needs to exceed the maximum current-carrying capacity, and fuse 1 needs to exceed the rated current. Overcurrent bar 2 and fuse 1 are both melted to achieve overload protection of the circuit. Therefore, overcurrent bar 2 needs to be provided with notch section 211. Obviously, the cross-sectional area of notch section 211 is smaller than that of the main body of overcurrent bar. Since the cross-sectional area is proportional to the maximum current-carrying capacity, the maximum current-carrying capacity of notch section 211 is less than the overcurrent value of the circuit. In this way, fuse 1 can be selected according to the difference between the overcurrent value of the circuit and the maximum current-carrying capacity of notch section 211. The specific design principle is as follows:

[0036] In the case of the battery module 5 of 16 strings of 3.2V, 280Ah battery cells, the overcurrent value is 280*0.5=140A, if the overcurrent row 2 is an aluminum row, the width and thickness specifications are 30*3mm, and if the width and thickness specifications of the cut part to form the notch section 211 are 10*3mm, the maximum carrying capacity of the notch section 211 can be calculated according to the formula I=K*S, where I is the maximum carrying capacity, K is the material coefficient, the K value of aluminum is usually 2A / mm2, the specific value depends on the heat dissipation condition, ambient temperature, etc., and S is the cross-sectional area. The maximum carrying capacity of this notch section 211 is 60A, and the remaining part of the circuit has a flow of 80A. Since the working current of the fuse 1 is usually 1.2~1.5 times the rated current, the fuse 1 can be selected to be 96A~120A.

[0037] In this way, when the current in the circuit exceeds the overcurrent value, both the fuse 1 and the notch section 211 of the overcurrent row 2 are fused, thereby cutting off the circuit. As can be seen, the notch section 211 is arranged in the above structure, which can improve the reliability of overload protection.

[0038] In addition, as shown in Figure 3 , since the fuse 1 is installed on the overcurrent row 2 through the metal support 3, a gap is left between the fuse 1 and the overcurrent row 2, which can avoid the fuse 1 and the overcurrent row 2 being too close, thereby preventing the accumulation of heat near the fuse 1 and the overcurrent row 2 from causing a local temperature anomaly, and further avoiding the current conduction failure of the fuse 1 and the overcurrent row 2, thereby improving the reliability of overload protection.

[0039] On the basis of the above embodiments, please refer to Figure 3 and Figure 4 , the notch section 211 is located in the middle of the overcurrent row 2.

[0040] As can be easily understood, the fuse 1 is installed on the overcurrent row 2 through the metal support 3, and the overcurrent row 2 is located between the series-connected battery cells. In this way, the overcurrent row 2 not only plays a role in current conduction, but also plays a supporting role. The notch section 211 is formed by cutting part of the material of the overcurrent row 2, and the notch section 211 is located in the middle of the overcurrent row 2, which can balance the load on both sides of the overcurrent row 2 to improve the structural stability of the overcurrent row 2, thereby better supporting the fuse 1.

[0041] On the basis of the above embodiments, considering the specific arrangement of the notch section 211, as a preferred option, please refer to Figure 4 , the middle of the overcurrent row 2 (i.e. the following support plate 21) is symmetrically provided with a U-shaped notch along the width direction of the overcurrent row 2, and the plate body between the two notches is the notch section 211.

[0042] The notch segment 211 has the following advantages: first, the symmetrical notch can make the overcurrent bar 2 bear uniformly, avoid stress concentration on one side to cause local deformation, improve the structural stability of the overcurrent bar 2, thereby stably supporting the fuse 1; second, the notch is U-shaped, which can make the support plate 21 have an I-shaped structure. The I-shaped structure has the characteristics of high strength and bending resistance, which can further improve the structural stability of the overcurrent bar 2, thereby more stably supporting the fuse 1.

[0043] Based on the above embodiments, please refer to Figure 3 , the fuse 1 is arranged at the end of the metal support 3 away from the overcurrent bar 2, so as to leave an electrical gap between the overcurrent bar 2.

[0044] It should be noted that the electrical gap refers to the shortest spatial distance between two conductive parts. This distance can ensure the shortest distance of insulation through air while ensuring stable and safe electrical performance.

[0045] Specifically, the bottom end of the metal support 3 is arranged on the overcurrent bar 2, and the top end of the metal support 3 is arranged with the fuse 1. According to the specified electrical gap, a metal support 3 with appropriate height can be selected to form an electrical gap between the fuse 1 and the overcurrent bar 2, so as to realize the insulation of the fuse 1 and the overcurrent bar 2, and avoid electrical short circuit or discharge phenomenon.

[0046] Based on the above embodiments, considering the specific arrangement of the overcurrent bar 2, as a preferred, please refer to Figure 3 and Figure 4 , the overcurrent bar 2 includes a support plate 21 and two connecting plates 22 integrally connected and formed at both ends of the support plate 21, and the metal support 3 is arranged on the support plate 21.

[0047] The overcurrent bar 2 is integrally formed, which has the characteristics of strong bearing capacity and high structural strength, and can more stably support the fuse 1, that is, improve the structural stability of the fuse 1. In addition, the connecting plates 22 on both sides of the overcurrent bar 2 are used to connect the output ends of the battery cells, and the support plate 21 in the middle is used to support the fuse 1, which can more evenly disperse the load of the fuse 1 and avoid bending deformation due to partial load, thereby improving the stability and bearing capacity of the overcurrent bar 2, and further improving the structural stability of the fuse 1.

[0048] In a specific embodiment, please refer to Figure 4 , the overcurrent bar 2 has an I-shaped structure. That is, one connecting plate 22, a support plate 21 and another connecting plate 22 are connected in sequence to form an I-shaped structure. The I-shaped structure can better disperse stress and has strong bearing capacity and deformation resistance, thereby more stably supporting the fuse 1.

[0049] On the basis of the above embodiments, considering the specific arrangement mode of the metal bracket 3, as a preferred, please refer to Figure 3 and Figure 4 The metal bracket 3 includes two connecting plates, each in the shape of L, the vertical segments of the two connecting plates are sleeved with the two ends of the fuse 1, and the horizontal segments of the two connecting plates are arranged on the support plate 21 through the metal fastener 4.

[0050] The metal bracket 3 has the following advantages by adopting the above structure: first, the metal bracket 3 is a split structure composed of two connecting plates, and the distance between the two connecting plates can be adjusted according to the specific length of the fuse 1, so that it can be applied to install fuses 1 of different length sizes; second, the connecting plates are in the shape of L, which not only occupies small space, but also can better adapt to be installed inside the energy storage battery box, and the structure is stable, which can stably support the fuse 1; third, the vertical segments of the connecting plates are sleeved with the fuse 1, which facilitates the disassembly and assembly of the fuse 1.

[0051] It should be pointed out that since the middle part of the overcurrent discharge 2 is located on the support plate 21, the gap segment 211 is located on the support plate 21. It is not difficult to understand that compared with the cross-sectional area of other positions of the overcurrent discharge 2, the cross-sectional area of the gap segment 211 is smaller, and the gap segment 211 is in an elongated structure and has weaker carrying capacity. Therefore, in order to ensure the stable installation of the fuse 1, the metal bracket 3 is erected on the support plate 21 across the gap segment 211, that is, one connecting plate 22 is installed beside one end of the gap segment 211 and the other connecting plate 22 is installed beside the other end of the gap segment 211.

[0052] Considering the specific arrangement of the metal fastener 4, in one specific embodiment, please refer to Figure 3 and Figure 4 The horizontal segment of the connecting plate is provided with a first mounting hole, the support plate 21 is provided with a second mounting hole opposite to the first mounting hole, and the metal fastener 4 is threadedly connected to the second mounting hole through the first mounting hole. In this way, the metal fastener 4 can be a bolt or a screw, and the connecting plate 22 and the support plate 21 are fixed by screw connection, which has high connection strength and the connecting plate 22 is not easy to loosen, thereby ensuring the firm installation of the fuse 1.

[0053] Considering the specific arrangement of the metal fastener 4, in another specific embodiment, the metal fastener 4 includes a first clamping part and a second clamping part matched by clamping, the first clamping part is arranged on the horizontal segment of the connecting plate, and the second clamping part is arranged on the support plate 21. In this way, the connecting plate 22 and the support plate 21 are fixed by buckling connection, which facilitates the disassembly and assembly of the connecting plate 22, thereby facilitating the replacement or maintenance of the fuse 1.

[0054] In addition to the fuse assembly described above, the utility model also provides a kind of energy storage battery box, including the fuse assembly disclosed in the above embodiment, still including box 6 and battery module 5, fuse assembly is located between the battery unit in series in battery module 5, as Figure 1 As shown. The structure of other parts of the energy storage battery box please refer to prior art, this paper will not repeat.

[0055] It should be noted that, in the present specification, such as the first and second relationship terms are only used to distinguish one entity from other entities, and do not necessarily require or imply any such actual relationship or order between the entities.

[0056] Each embodiment in the present specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between each embodiment can be referred to each other.

[0057] The above provides a kind of energy storage battery box and its fuse assembly provided by the utility model are introduced in detail.In this paper, the principle and implementation mode of the utility model are described by applying specific examples, and the above embodiment is only used to help understand the method and core idea of the utility model.It should be pointed out that, for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims

1. A fuse assembly characterized by, The fuse (1) and the overcurrent bar (2) are included, the overcurrent bar (2) is used for accessing the circuit of the energy storage battery box, the overcurrent bar (2) is provided with a metal support (3) for installing the fuse (1), and the overcurrent bar (2) is provided with a notch section (211), and the sum of the maximum carrying capacity of the notch section (211) and the rated current of the fuse (1) is equal to the overcurrent value of the circuit.

2. The fuse assembly of claim 1, wherein, The notch section (211) is located in the middle of the overcurrent bar (2).

3. The fuse assembly of claim 2, wherein, The middle of the overcurrent bar (2) is symmetrically provided with a U-shaped notch along the width direction of the overcurrent bar (2), and the plate body between the two notches is the notch section (211).

4. The fuse assembly of claim 1, wherein, The fuse (1) is arranged at one end of the metal support (3) away from the overcurrent bar (2) to leave an electrical gap between the overcurrent bar (2).

5. The fuse assembly of any one of claims 1 to 4, wherein, The overcurrent bar (2) includes a support plate (21) and two connecting plates (22) integrally connected and formed at both ends of the support plate (21), and the metal support (3) is arranged on the support plate (21).

6. The fuse assembly of claim 5, wherein, The metal support (3) includes two L-shaped connecting plates, the vertical sections of the two connecting plates are respectively sleeved with both ends of the fuse (1), and the horizontal sections of the two connecting plates are arranged on the support plate (21) through metal fasteners (4).

7. The fuse assembly of claim 6, wherein, The horizontal section of the connecting plate is provided with a first mounting hole, the support plate (21) is provided with a second mounting hole opposite to the first mounting hole, and the metal fastener (4) is threadedly connected to the second mounting hole through the first mounting hole.

8. The fuse assembly of claim 6, wherein, The metal fastener (4) includes a first clamping part and a second clamping part matched with each other, the first clamping part is arranged on the horizontal section of the connecting plate, and the second clamping part is arranged on the support plate (21).

9. The fuse assembly of claim 5, wherein, The overcurrent bar (2) has a U-shaped structure.

10. An energy storage battery pack, characterized by, The fuse assembly according to any one of claims 1-9. The fuse assembly according to any one of claims 1-9.

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