Circuit fusing structure of battery pack, battery pack and energy storage device

Abstract

The utility model discloses a circuit fusing structure of a battery pack, the battery pack and an energy storage device. The circuit fusing structure comprises a fusing main body, a first input stage and a second input stage, wherein the fusing main body is located between the first input stage and the second input stage; the first input stage is connected with the positive electrode of the battery module through a total positive copper bar of the battery module, the second input stage is fixed on a positive terminal of the voltage conversion plate, and the second input stage is connected with the negative electrode of the battery module through the voltage conversion plate and a total negative copper bar of the battery module, so that a main loop of the circuit fusing structure is formed; the fusing main body is arranged on the main loop, and the fusing main body can be fused to cut off the main loop. According to the circuit fusing structure, the fusing main body in the circuit fusing structure can be actively fused, and after the main loop is cut off, current can be prevented from continuously passing through the main loop, so that components on the main loop can be effectively prevented from being damaged due to the flowing-in current when a fault occurs, the service life of the battery pack is prolonged, and the service life of the battery pack is prolonged. And the real-time monitoring management of the battery pack is realized.

Description

Technical Field

[0001] This application relates to the technical field of energy storage, and particularly to a circuit fusing structure, a battery pack, and an energy storage device for a battery pack. Background Art

[0002] Currently, an energy storage device includes one or more battery packs. A battery pack mainly includes a box body, a voltage converter (DC-to-DC Converter, DCDC), and a battery module. However, the battery pack is prone to shortened lifespan and damage under extreme conditions such as overcharge protection, over-discharge protection, over-current protection, over-temperature protection, and short-circuit protection. Therefore, real-time monitoring and management of the battery pack are required. Summary of the Utility Model

[0003] In view of this, this application aims to at least solve one of the problems in the related art to some extent. For this reason, the purpose of this application is to provide a circuit fusing structure, a battery pack, and an energy storage device for a battery pack.

[0004] This application provides a circuit fusing structure for a battery pack. The battery pack further includes a box body, a voltage converter, and a battery module. The voltage converter includes a voltage conversion board, and the battery module includes a total positive copper busbar, a total negative copper busbar, a battery module positive electrode, and a battery module negative electrode. The circuit fusing structure includes a fusing body, a first input stage, and a second input stage. The fusing body is located between the first input stage and the second input stage. The first input stage is connected to the battery module positive electrode through the total positive copper busbar. The second input stage is fixed on the positive terminal of the voltage conversion board, and the second input stage is connected to the battery module negative electrode through the voltage conversion board and the total negative copper busbar, forming the main circuit of the circuit fusing structure. The fusing body is on the main circuit and can be fused to cut off the main circuit.

[0005] In some embodiments, the circuit fusing structure further includes an insulating support member. The first input stage is fixed on the first surface of the insulating support member, and the second surface of the insulating support member is fixed on the box body.

[0006] In some embodiments, the box body is provided with positioning posts corresponding to the insulating support member, and the surface of the positioning post in contact with the insulating support member is provided with positioning holes.

[0007] In some embodiments, the second input stage is fixed on the negative terminal of the voltage conversion board. The first end of the total negative copper busbar is fixed on the negative terminal of the voltage conversion board, and the second end of the total negative copper busbar is fixed on the battery module negative electrode.

[0008] In some embodiments, the voltage converter further includes a battery management circuit board, and the circuit fusing structure further includes a control device. A first end of the control device is connected to the fusing body, and a second end of the control device is connected to the battery management circuit board to form a control loop. The control loop is configured to control, through the battery management circuit board, the control device to fuse the fusing body so as to cut off the main circuit.

[0009] In some embodiments, the circuit fusing structure includes a control coil, and the second end of the control device is connected to the battery management circuit board through the control coil.

[0010] In some embodiments, a heating element is provided in the control device, and the heating element is configured to fuse the fusing body.

[0011] In some embodiments, the control coil and the control device are respectively located on two sides of the fusing body. The control coil and the control device are located in a first direction of the fusing body, and the first input stage and the second input stage are located in a second direction of the fusing body.

[0012] The present application also provides a battery pack. The battery pack includes a box body, a battery module, a voltage converter, and the circuit fusing structure described in the above embodiments. The circuit fusing structure, the voltage converter, and the battery module are assembled inside the box body, and the voltage converter is electrically connected to the battery module and the circuit fusing structure respectively.

[0013] The present application also provides an energy storage device. The energy storage device includes the battery pack described in the above embodiments.

[0014] The circuit fusing structure of the present application can actively fuse the fusing body inside the circuit fusing structure. After cutting off the main circuit, it can prevent current from continuing to flow through the main circuit, effectively prevent components on the main circuit from being damaged due to the current flowing in during a fault, extend the service life of the battery pack, and realize real-time monitoring and management of the battery pack.

[0015] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the drawings, where:

[0017] Figure 1 is a schematic structural diagram of an energy storage device according to some embodiments of the present application;

[0018] Figure 2It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0019] Figure 3 It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0020] Figure 4 It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0021] Figure 5 It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0022] Figure 6 It is a schematic structural diagram of a circuit fuse structure according to some embodiments of the present application;

[0023] Figure 7 It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0024] Figure 8 It is a schematic structural diagram of a battery pack according to some embodiments of the present application;

[0025] Figure 9 It is a schematic structural diagram of a battery pack according to some embodiments of the present application.

[0026] Main reference numerals of the drawings:

[0027] Energy storage device 1000;

[0028] Battery pack 100; Control unit 200; Base 300;

[0029] Circuit fuse structure 10, fuse main body 11, first input stage 12, second input stage 13, insulating support 14, control device 15, control coil 16; Box body 20, battery compartment housing 21, first housing 211, second housing 212, positioning post 22, positioning hole 221; Battery module 30, copper bar 31, total positive copper bar 311, total negative copper bar 312, battery module positive electrode 32, battery module negative electrode 33; Voltage converter 40; Voltage conversion board 41, positive terminal 411, negative terminal 412; Battery management circuit board 42. Detailed implementation manners

[0030] The following describes in detail the embodiments of the present application. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and should not be construed as a limitation of the present application.

[0031] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted" and "connected" should be understood in a broad sense. It may refer to a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, an electrical connection, or a connection capable of mutual communication; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. To simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present application. Additionally, the present application may repeat reference numerals and / or reference letters in different examples. This repetition is for the purpose of simplification and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0034] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application.

[0035] Please refer to Figure 1 and Figure 2 , the present application discloses an energy storage device 1000. The energy storage device 1000 includes a battery pack 100. The energy storage device 100 includes a battery pack 100, a control unit 200, and a base 300. The number of battery packs 100 can be at least two, and at least two battery packs 100 are sequentially stacked between the base 300 and the control unit 200. The base 300 is used to support the battery pack 100. The control unit 200 is located on top of the battery pack 100. The control unit 200 is electrically connected to the battery pack 100. For example, the control unit 200 can be used to control the charging, discharging, or usage status of the battery pack 100, etc.

[0036] Please refer to together Figures 2 to 5, the battery pack 100 of the present application includes a circuit fusing structure 10, a box body 20, a battery module 30, and a voltage converter 40. The control unit 200 can be electrically connected to the voltage converter 40 and / or the load. The circuit fusing structure 10, the voltage converter 40, and the battery module 30 are assembled inside the box body 20, and the voltage converter 40 is electrically connected to the battery module 30 and the circuit fusing structure 10 respectively.

[0037] The box body 20 includes a battery compartment housing 21, and the battery compartment housing 21 is used to accommodate the circuit fusing structure 10, the battery module 30, and the voltage converter 40. The battery compartment housing 21 includes a first housing 211 and a second housing 212 arranged oppositely. The box body 20 further includes a connecting member 22, and the connecting member 22 is connected to the battery compartment housing 21. For example, the connecting member 22 is fixed to the battery compartment housing 21 by screws. As Figure 2 shown, the connecting member 22 can be located on the first housing 211 of the battery compartment housing 21, and a part of the connecting member 22 extends beyond the top of the first housing 211 of the battery compartment housing 21. During the stacking process of the battery packs 100, the part of the connecting member 22 that extends beyond the top of the battery compartment housing 21 is used to fix the battery compartment housing 21 of the adjacent box body 20.

[0038] Please refer to Figure 3 , the battery module 30 can include a copper busbar 31, a battery module positive electrode 32, a battery module negative electrode 33, a plurality of battery cells, and power lines and signal lines connecting the battery cells. The copper busbar 31 includes a total positive copper busbar 311 and a total negative copper busbar 312.

[0039] The voltage converter 40 includes a voltage conversion board 41.

[0040] Please refer to Figures 4 to 7 together, the circuit fusing structure 10 of the present application includes a fusing body 11, a first input stage 12, and a second input stage 13. The fusing body 11 is located between the first input stage 12 and the second input stage 13.

[0041] The first input stage 12 is connected to the battery module positive electrode 32 through the total positive copper busbar 311. The second input stage 13 is fixed on the positive terminal 411 of the voltage conversion board 41, and the second input stage 13 is connected to the battery module negative electrode 33 through the voltage conversion board 41 and the total negative copper busbar 312, forming the main circuit of the circuit fusing structure 10.

[0042] The fusing body 11 is on the main circuit, and the fusing body 11 is fusible to cut off the main circuit.

[0043] Understandably, in the circuit fusing structure 10 of the present application, when the current on the main circuit passes through the fusing body 11 under specified voltage conditions, the heat effect of the current can be utilized. When the heat accumulates to a certain extent, a special part of the fusing body can melt and break, thereby cutting off the main circuit and safely disconnecting the components on the main circuit that have a fault current flowing in. That is to say, the circuit fusing structure 10 of the present application can actively fuse the fusing body 11 inside the circuit fusing structure 10, cut off the main circuit, prevent the current from continuing to pass through the main circuit, and prevent the components on the main circuit from being damaged due to the current flowing in during a fault.

[0044] That is to say, when the current flowing into the main circuit is too large due to a fault inside the battery pack, the fusing body 11 can actively fuse, cut off the main circuit, and prevent the components on the main circuit from being damaged due to overcurrent. The fusing body 11 can be made of a fuse or other materials.

[0045] In this way, the circuit fusing structure 10 of the present application can fuse the fusing body 11 inside the circuit fusing structure 10. After cutting off the main circuit, it can prevent the current from continuing to pass through the main circuit, effectively prevent the components on the main circuit from being damaged due to the current flowing in during a fault, extend the service life of the battery pack 100, and achieve real-time monitoring and management of the battery pack.

[0046] Please also refer to Figure 4 、 Figure 5 and Figure 7 , the circuit fusing structure 10 further includes an insulating support 14. The first input stage 12 of the circuit fusing structure 10 is fixed on the first surface of the insulating support 14, and the second surface of the insulating support 14 is fixed on the box body 20.

[0047] That is to say, the first input stage 12 of the circuit fusing structure 10 of the present application can be supported by the insulating support 14, and the setting position of the first input stage 12 of the circuit fusing structure 10 inside the box body 20 can be fixed through the insulating support 14.

[0048] The material of the insulating support 14 can be, for example, rubber, plastic, glass or ceramic, and is not limited here.

[0049] Please refer to Figure 8 and Figure 9 , in some embodiments, the box body 20 can be provided with positioning posts 22 corresponding to the insulating support 14. The surface of the positioning post 22 in contact with the insulating support 14 is provided with a positioning hole 221. Correspondingly, the second surface of the insulating support 14 can also be provided with a plug-in portion corresponding to the positioning hole 221, so that the plug-in portion of the insulating support 14 can be screwed into the positioning post 22, and the plug-in portion is engaged with the positioning hole 221, making the insulating support 14 more firmly and accurately positioned and fixed on the box body 20.

[0050] In one embodiment, the insulating support 14 is an insulating column. That is, the first input stage 12 of the circuit fuse structure 10 of the present application can be supported by the insulating column, and the setting position of the first input stage 12 of the circuit fuse structure 10 inside the box body 20 can be fixed by the insulating column.

[0051] Please refer to Figure 4 and Figure 7 , the second input stage 13 of the circuit fuse structure 10 is fixed on the negative terminal 412 of the voltage conversion board 41, the first end of the total negative copper busbar 312 is fixed on the negative terminal 412 of the voltage conversion board 41, and the second end of the total negative copper busbar 312 is fixed on the negative electrode 33 of the battery module. That is, the circuit fuse structure 10 of the present application can be connected to the negative electrode 33 of the battery module through the second input stage 13.

[0052] Please refer to Figure 4 and Figure 5 , in some embodiments, the voltage converter 40 further includes a battery management circuit board 42. The battery management circuit board 42 is used to monitor and manage the state of the battery to ensure the safe and efficient operation of the battery. The battery management circuit board 42 has a fault detection function.

[0053] In one embodiment, the voltage conversion board 41 includes support columns. The battery management circuit board 42 can be mounted on the voltage conversion board 41 through the support columns. The support columns can be hexagonal copper columns, and 4 support columns can be provided. The 4 support columns are respectively arranged at the 4 corners of the voltage conversion board 41.

[0054] That is, the integration of the voltage conversion board 41 and the battery management circuit board 42 in the voltage converter 40 of the present application is provided as a whole, so that the voltage converter 40 of the present application can be applied to an energy storage solution for large-capacity household energy storage. The large-capacity stored energy is, for example, 280Ah.

[0055] The integration of the voltage conversion board 41 and the battery management circuit board 42 of the present application is provided as a whole, and it can also make more space for the layout of the voltage converter 40 within the limited space of the voltage converter 40. For example, the area of the voltage converter 40 is 233*245, and the power of the voltage converter 40 can reach a preset maximum power value. The preset maximum power value is, for example, 3.5KW or other values, which are not limited here.

[0056] Please refer to Figures 4 to 6 , the circuit fuse structure 10 further includes a control device 15. The first end of the control device 15 is connected to the fuse body 11, and the second end of the control device 15 is connected to the battery management circuit board 42 to form a control loop. The control loop is used to control the control device 15 to fuse the fuse body 11 through the battery management circuit board 42 to cut off the main circuit.

[0057] For example, when overvoltage, undervoltage, or high temperature occurs in the battery pack, since the battery management circuit board 42 has a fault detection function, the battery management circuit board 42 determines that it is necessary to fuse the fuse body 11 at this time to cut off the main circuit to protect the entire battery system. Then, the battery management circuit board 42 can send a control instruction to the control device 15, so that the control device 15 can fuse the fuse body 11 inside the circuit fuse structure 10 to cut off the main circuit, preventing the current from continuing to pass through the main circuit and preventing the components on the main circuit from being damaged due to the current flowing in during a fault.

[0058] That is to say, the circuit fuse structure 10 of the battery pack in this application can not only actively fuse the fuse body 11 to cut off the main circuit, but also control the control device 15 through the control instruction sent by the battery management circuit board 42, and fuse the fuse body 11 through the control device 15 to cut off the main circuit.

[0059] Specifically, please refer to Figure 4 and Figure 6 , the circuit fuse structure 10 includes a control coil 16. The second end of the control device 15 is connected to the battery management circuit board 42 through the control coil 16. That is to say, the control device 15 in the circuit fuse structure 10 of this application can be connected to the battery management circuit board 42 through the control coil 16, thereby realizing the control of the control device 15 by the battery management circuit board 42.

[0060] A heating element is provided in the control device 15, and the heating element is used to fuse the fuse body 11 to cut off the main circuit. The heating element can be, for example, a resistive heating element, a motor-type heating element, a transformer-type heating element, or other heating elements.

[0061] Among them, the resistive heating element can be, for example, a resistance wire, an electric heating wire, etc. Such elements will convert electrical energy into heat energy when energized. It can be understood that when the current is too large, the resistive heating element will generate a large amount of heat. If the heat cannot be dissipated in time, it will cause the surrounding environmental temperature to rise, which can cause the fuse body 11 to fuse.

[0062] The motor-type heating element can be, for example, a motor, a generator, etc. Such devices will generate a certain amount of heat during operation. It can be understood that the heat generated by the motor causes the surrounding environmental temperature to rise, which can cause the fuse body 11 to fuse.

[0063] The transformer-type heating element can be, for example, a transformer. During the working process of the transformer, heat will be generated due to the changes in current and magnetic field. If the heat generated by the transformer causes the surrounding environmental temperature to rise, it can cause the fuse body 11 to fuse.

[0064] Other heating elements include, but are not limited to, electric heaters, heating tubes, electric heating plates and other components. The heat generated by these components causes the temperature of the surrounding environment to rise, which can also cause the fuse body 11 to blow.

[0065] That is to say, the control device 15 of the present application can cause the temperature of the surrounding environment of the heating element to rise through the heat generated by the heating element, so that the fuse body 11 blows to cut off the main circuit.

[0066] Please refer to Figure 6 , in some embodiments, the control coil 16 and the control device 15 are respectively located on both sides of the fuse body 11. The control coil 16 and the control device 15 are located in the first direction of the fuse body 11, and the first input stage 12 and the second input stage 13 are located in the second direction of the fuse body 11.

[0067] That is to say, in the circuit fuse structure 10, the first input stage 12, the fuse body 11 and the second input stage 13 are in the same circuit direction, and the control device 15, the fuse body 11 and the control coil 16 are in the same circuit direction, which is beneficial to the circuit layout inside the battery pack and makes the wiring more reasonable.

[0068] The above embodiments only represent several implementation manners of the present application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the patent scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A circuit fuse structure of a battery pack, characterized in that: The battery pack further comprises a box, a voltage converter and a battery module, wherein the voltage converter comprises a voltage conversion board, and the battery module comprises a total positive copper bar, a total negative copper bar, a positive electrode of the battery module and a negative electrode of the battery module; The circuit fusing structure comprises a fuse body, a first input stage and a second input stage, wherein the fuse body is located between the first input stage and the second input stage; The first input stage is connected to the positive electrode of the battery module through the total positive copper busbar, the second input stage is fixed to the positive terminal of the voltage conversion board, and the second input stage is connected to the negative electrode of the battery module through the voltage conversion board and the total negative copper busbar, forming the main circuit of the circuit fuse structure; The fuse body is on the main circuit, and the fuse body can be fused to cut off the main circuit.

2. The circuit fusing structure according to claim 1, characterized in that: The circuit fusing structure further includes an insulating support member, the first input stage is fixed on a first surface of the insulating support member, and a second surface of the insulating support member is fixed on the box body.

3. The circuit fusing structure according to claim 2, characterized in that: The box body is provided with a positioning column corresponding to the insulating support member, and the surface of the positioning column contacting the insulating support member is provided with a positioning hole.

4. The circuit fusing structure according to claim 1, characterized in that: The second input stage is fixed to the negative terminal of the voltage conversion board, the first end of the total negative copper bar is fixed to the negative terminal of the voltage conversion board, and the second end of the total negative copper bar is fixed to the negative electrode of the battery module.

5. The circuit fusing structure according to claim 1, characterized in that: The voltage converter also includes a battery management circuit board, and the circuit fuse structure also includes a control device, a first end of the control device is connected to the fuse body, and a second end of the control device is connected to the battery management circuit board to form a control loop, and the control loop is used to control the control device through the battery management circuit board to fuse the fuse body to cut off the main circuit.

6. The circuit fusing structure according to claim 5, characterized in that: The circuit fusing structure includes a control coil, and the second end of the control device is connected to the battery management circuit board through the control coil.

7. The circuit fusing structure according to claim 6, characterized in that: A heating element is arranged in the control device, and the heating element is used for melting the fuse body.

8. The circuit fusing structure according to claim 7, characterized in that: The control coil and the control device are respectively located at two sides of the fuse body, the control coil and the control device are located in a first direction of the fuse body, and the first input stage and the second input stage are located in a second direction of the fuse body.

9. A battery pack, characterized in that: The battery pack includes a case, a battery module, a voltage converter and the circuit fuse structure according to any one of claims 1 to 8, wherein the circuit fuse structure, the voltage converter and the battery module are assembled inside the case, and the voltage converter is electrically connected to the battery module and the circuit fuse structure, respectively.

10. An energy storage device, characterized in that: The energy storage device comprises the battery pack as described in claim 9 above.

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