Fuse cooling structure and battery pack

Abstract

The utility model provides a fuse cooling structure and a battery pack, the fuse cooling structure comprises two fixing blocks which are respectively connected with two contact knives of a lap joint copper bar on a fuse, and the bottom of each fixing block is attached to an installation base. A flow channel for cooling liquid to flow is formed in each fixing block, and the two flow channels communicate with each other through a connecting pipe. The liquid inlet pipe is communicated with the flow channel of one fixing block; and the liquid outlet pipe is communicated with the flow channel of the other fixed block. According to the fuse cooling structure provided by the utility model, the two fixing blocks connected with the contact knife of the fuse are arranged, so that the contact knife of the fuse can be cooled by the cooling liquid through the flow channels in the fixing blocks, the cooling and heat dissipation of the fuse are realized, the normal work of the fuse is ensured, the cooling effect of a battery pack is improved, and the service life of the battery pack is prolonged. And the practicability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit protection, and in particular to a fuse cooling structure. The utility model also relates to a battery pack provided with the fuse cooling structure. Background Art

[0002] With the country's planning and support for the development of the new energy vehicle industry, the market share of new energy vehicles has continued to increase, and pure electric or hybrid vehicles have become more and more popular in people's lives. Among them, the safety of vehicle battery packs has become one of the important performance indicators of battery vehicles. The battery pack contains multiple battery modules, which can generate electricity through electrochemical reactions and transmit it outside the battery pack to provide electricity to the vehicle and drive the vehicle.

[0003] The output poles of each battery module are usually connected by a copper busbar, and the current of the output poles of each battery module is transmitted to the outside of the battery pack through the copper busbar. As the vehicle mileage increases, the battery pack is exposed to harsh working conditions with high temperature and strong vibration for a long time, which can easily cause a short circuit in the battery pack, resulting in damage to the battery pack, vehicle failure, and even a car accident. To ensure the safety of the battery pack during operation, a fuse is usually installed on the copper busbar in the battery pack, which can play the role of overload protection and short circuit protection. When the battery pack is in an abnormal working state, that is, a short circuit or overload occurs, and the current on the copper busbar is too large, the fuse is disconnected to protect the internal circuit of the battery pack and prevent the battery pack from being damaged.

[0004] Generally speaking, the fuse in the battery pack will generate heat during operation. If the fuse is in a high temperature environment for a long time, the service life and reliability of the fuse will decrease, and in severe cases it will fail, which will seriously affect the safety performance of the battery pack. Utility Model Content

[0005] In view of this, the utility model aims to propose a fuse cooling structure to cool and dissipate heat from the fuse to ensure the normal operation of the fuse, thereby improving the safety performance of the battery pack.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] A fuse cooling structure comprises two fixed blocks, which are respectively connected to two contact blades of a copper busbar on the fuse, and the bottom of each fixed block is attached to a mounting base. A flow channel for cooling liquid to flow is formed in each fixed block, and the two flow channels are connected by a connecting pipe; a liquid inlet pipe is connected to the flow channel of one fixed block; and a liquid outlet pipe is connected to the flow channel of the other fixed block.

[0008] Furthermore, the fixing block is made of aluminum alloy.

[0009] Furthermore, the inner wall of the flow channel is recessed into the fixing block to form a fin.

[0010] Furthermore, an insulating layer is coated on the fixing block, or an insulating gasket is provided between the fixing block and the contact blade.

[0011] Furthermore, the contact knife is pressed tightly against the top of the fixing block by a connecting member, and a groove for accommodating the contact knife is provided on the top of the fixing block.

[0012] Furthermore, it also includes a mounting seat, in which the two fixing blocks are embedded; the mounting seat is fixedly connected to the mounting base, and the bottom of the fixing block is in contact with the mounting base.

[0013] Furthermore, the installation base is a liquid cooling plate, and the liquid inlet pipe and the liquid outlet pipe are connected to the liquid cooling plate.

[0014] Furthermore, the liquid cooling plate is integrated on the shell of the battery pack.

[0015] Furthermore, a heat conducting layer is provided between the bottom of the fixing block and the liquid cooling plate.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] The fuse cooling structure described in the utility model, by providing two fixed blocks connecting the fuse contacts, enables the coolant to cool the fuse contacts via the flow channel in the fixed blocks, thereby achieving cooling and heat dissipation of the fuse, ensuring the normal operation of the fuse, thereby improving the safety performance of the battery pack, and having good practicality.

[0018] The fixed block is made of aluminum alloy, which is light in weight and has good thermal conductivity, which can improve the heat transfer efficiency of the fixed block, so that the coolant can fully exchange heat with the contact knife through the fixed block to ensure the cooling effect of the coolant in the flow channel on the contact knife.

[0019] The inner wall of the flow channel is recessed into the fixed block to form fins. By providing the fins, when the coolant flows between the fins, the heat exchange area and heat exchange efficiency between the coolant and the fixed block can be increased, thereby improving the cooling effect and cooling efficiency of the fixed block on the contact knife.

[0020] An insulating layer is coated on the fixed block or an insulating gasket is provided between the fixed block and the contact knife to prevent current from flowing to the fixed block and the inlet and outlet pipes to cause leakage, thereby affecting the normal operation of the battery pack.

[0021] The touch knife is pressed tightly against the top of the fixed block by the connecting piece, so that the touch knife and the fixed block fit closely, improving the cooling effect of the touch knife, and a groove for accommodating the touch knife is provided on the top of the fixed block, which can effectively fix the touch knife and prevent the touch knife from detaching from the fixed block.

[0022] The two fixing blocks are embedded in the mounting seat, so that the mounting seat can play a fixed connection effect on the two fixing blocks, and at the same time, the mounting seat is connected to the mounting base to ensure that the two fixing blocks are tightly fitted to the mounting base.

[0023] The installation base is a liquid cooling plate, which can directly cool the fixed block attached thereto, further improving the cooling effect on the fixed block, thereby improving the cooling and heat dissipation effect on the contact knife and the fuse. At the same time, the liquid inlet pipe and the liquid outlet pipe are connected to the liquid cooling plate, so as to obtain the coolant through the liquid cooling plate and transport it to the flow channels of the two fixed blocks, so as to transport the coolant to the fixed blocks.

[0024] The liquid cooling plate is integrated on the shell of the battery pack, which can improve the space utilization inside the battery pack and reduce the volume of the battery pack to a certain extent.

[0025] A heat conducting layer is provided between the bottom of the fixed block and the liquid cooling plate. The heat conducting layer can fill the gap between the bottom of the fixed block and the liquid cooling plate, so that the bottom of the fixed block is in full contact with the liquid cooling plate, thereby improving the heat transfer effect between the fixed block and the liquid cooling plate, and then the liquid cooling plate cools the fixed block, improving the cooling and heat dissipation effect of the fixed block, thereby improving the cooling effect and cooling efficiency of the contact knife and the fuse.

[0026] Another object of the present invention is to provide a battery pack, in which the fuse cooling structure as described above is provided.

[0027] The battery pack and fuse cooling structure described in the present invention has the same beneficial effects as those of the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of the overall structure of the fuse cooling structure according to the first embodiment of the utility model;

[0030] Figure 2 It is a side view of the fuse cooling structure according to the first embodiment of the utility model;

[0031] Figure 3 For the utility model Figure 2A cross-sectional view at the position indicated by AA;

[0032] Description of reference numerals:

[0033] 1. Fixed block; 101. Flow channel; 102. Fin; 103. Insulating gasket; 104. Heat conducting layer;

[0034] 2. Fuse; 201, contact knife;

[0035] 3. Copper busbar; 4. Installation base; 5. Connecting pipe; 6. Liquid inlet pipe; 7. Liquid outlet pipe; 8. Connecting piece; 9. Mounting base; 10. Liquid cooling plate. DETAILED DESCRIPTION

[0036] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the description of the present invention, it should be noted that if there are terms such as "upper", "lower", "inner", "outer" and the like indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if there are terms such as "first" and "second", they are also used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installation", "connection", "connection" and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0039] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0040] Embodiment 1

[0041] This embodiment relates to a fuse cooling structure for cooling and dissipating heat from a fuse 2. The overall structure is as follows: Figure 1 , Figure 2 and Figure 3 As shown, the fuse cooling structure of this embodiment includes a fixing block 1 , a connecting pipe 5 , a liquid inlet pipe 6 and a liquid outlet pipe 7 .

[0042] Among them, the fixed block 1 includes two contact knives 201 respectively connected to the two contact knives 201 overlapping the copper bus 3 on the fuse 2, and the bottoms of the two fixed blocks 1 are attached to a mounting base 4. A flow for the flow of coolant is formed in each fixed block 1, and the two flow channels 101 in the two fixed blocks 1 are connected through a connecting pipe 5.

[0043] At the same time, any fixed block 1 is connected to a liquid inlet pipe 6, which is in communication with the flow channel 101 in the fixed block 1. And another fixed block 1 is connected to a liquid outlet pipe 7, which is in communication with the flow channel 101 in the fixed block 1.

[0044] It can be understood that the heating of the fuse 2 is generated by the current flowing through the copper bus 3 passing through the internal components of the fuse 2. Since the contact blade 201 is directly connected to the electrical components inside the fuse 2, when the contact blade 201 of the fuse 2 is cooled, the electrical components inside the fuse 2 can be cooled, thereby achieving the purpose of cooling the fuse 2.

[0045] As described above, by providing two fixed blocks 1 connecting the contact blade 201 of the fuse 2, the coolant can cool the contact blade 201 of the fuse 2 via the flow channel 101 in the fixed block 1, thereby achieving cooling and heat dissipation of the fuse 2, ensuring the normal operation of the fuse 2, and thus improving the safety performance of the battery pack.

[0046] Based on the above overall introduction, specifically, the fuse 2 of this embodiment adopts an active fuse, which has a control element connected to the micro control unit. The micro control unit can judge whether the battery module is in a normal working state based on data such as current. When an abnormal working condition occurs, the micro control unit sends a signal to the control element to cause the fuse 2 to blow. The use of an active fuse enables the micro processing unit to judge the working state of the battery pack based on the parameters measured by various sensors. Compared with a passive fuse, an active radiator has a higher sensitivity and can be fused according to the working parameters of different battery packs, which can better ensure the safety performance of the battery pack. At the same time, the copper bus 3 is connected to the output pole of each battery module, and is used to gather the electric energy output by each battery module and output it outside the battery pack.

[0047] In addition, if Figure 3 As shown, the flow channel 101 in this embodiment is constructed in a "concave" shape, and the flow channel 101 is connected to the liquid inlet pipe 6 or the liquid outlet pipe 7 provided on the opposite end surfaces of the fixed block 1, and the connecting pipe 5. In specific implementation, the coolant flowing through the flow channel 101 can be a common coolant well known to those skilled in the art, such as a coolant with water, ethanol, ethylene glycol or glycerin as the main component, as long as it has a good heat exchange effect.

[0048] In order to improve the cooling effect of the coolant on the contact blade 201 and the fuse 2, the fixing block 1 of this embodiment is made of aluminum alloy, which has a light weight and good thermal conductivity, thereby improving the heat transfer efficiency of the fixing block 1, so that when the coolant flows through the flow channel 101 in the fixing block 1, the coolant is fully heat-exchanged with the contact blade 201 through the fixing block 1, thereby improving the cooling effect and cooling efficiency of the contact blade 201, thereby improving the cooling and heat dissipation effect of the fuse 2. At the same time, the fixing block 1 is made of aluminum alloy, which can reduce the processing difficulty of the flow channel 101 to a certain extent.

[0049] In order to further improve the cooling effect of the coolant on the contact blade 201 and the fuse 2, as Figure 3 As shown, the inner wall of the flow channel 101 of the present embodiment is recessed into the fixed block 1 to form the fins 102. Through the arrangement of the fins 102, the coolant flows between the fins 102, which can increase the contact area between the coolant flowing through the flow channel 101 and the fixed block 1, thereby increasing the heat exchange area and heat exchange efficiency between the coolant and the fixed block 1, thereby improving the cooling effect and cooling efficiency of the contact knife 201.

[0050] Since the contact blade 201 of the fuse 2 is connected to the copper bar 3, and the contact blade 201 is connected to the fixed block 1, in order to prevent the contact blade 201 and the copper bar 3 from leaking electricity to other components via the fixed block 1, an insulating layer is coated on the fixed block 1 of this embodiment to ensure that when the contact blade 201 abuts against the fixed block 1, no current will flow to the fixed block 1 to cause leakage. In specific implementation, the insulating layer can adopt conventional insulating coatings known to those skilled in the art, such as insulating paint, polyurethane coating, polyethylene coating, thermal conductive silicone coating, etc., which have good insulation and good thermal conductivity. In addition, the insulating layer is only coated on the end surface where the fixed block 1 is connected to the contact blade 201.

[0051] In addition, in this embodiment, an insulating gasket 103 may be provided between the fixed block 1 and the contact blade 201 to prevent the contact blade 201 from contacting the fixed block 1. The insulating gasket 103 may be a conventional thermally conductive silicone gasket, which has good thermal conductivity and energy absorption while ensuring the insulation effect. Thus, the above structure can avoid the occurrence of leakage and ensure the safety of the fuse cooling structure when in use.

[0052] In order to ensure the cooling effect of the coolant and the fixing block 1 on the contact blade 201, as Figure 1 , Figure 3As shown, the contact blade 201 of this embodiment is pressed against the top of the fixed block 1 by the connecting member 8, and a groove for accommodating the contact blade 201 is provided on the top of the fixed block 1. The contact blade 201 is pressed against the top of the fixed block 1 by the connecting member 8, so that the contact blade 201 and the top of the fixed block 1 are closely fitted, ensuring the contact area between the contact blade 201 and the fixed block 1, and improving the heat transfer effect. At the same time, the groove on the top of the fixed block 1 can accommodate the contact blade 201, thereby facilitating the installation of the fuse 2, and the groove can limit the movement of the contact blade 201 to a certain extent, preventing the contact blade 201 and the fixed block 1 from loosening due to the vibration of the battery pack, resulting in a decrease in the heat transfer effect, thereby improving the cooling effect of the coolant and the fixed block 1 on the contact blade 201 and the fuse 2. In specific implementation, the connecting member 8 of this embodiment is a bolt, a mounting hole is provided on the top of the fixing block 1, and mounting holes are provided on the contact blade 201 and the copper bar 3. When the bolt is screwed on the fixing block 1 through the mounting holes, the contact blade 201 and the copper bar 3 can be pressed tightly against the top of the fixing block 1. In addition, the position where the bolt abuts against the contact blade 201 and the copper bar 3 is coated with the above-mentioned insulating layer to prevent leakage.

[0053] In order to facilitate the installation and fixation of the two fixing blocks 1, as shown in FIG. Figure 1 , Figure 3 As shown, in this embodiment, two fixed blocks 1 are embedded in a mounting seat 9, and the mounting seat 9 is fixedly connected to the mounting base 4, so that the bottom of the two fixed blocks 1 can be fitted with the mounting base 4. It can be understood that by setting the mounting seat 9 and connecting the two fixed blocks 1 together, the stability of the connection between the two fixed blocks 1 can be improved, and at the same time, the mounting seat 9 connects the two fixed blocks 1, so that the fixed block 1 and the mounting seat 9 form a whole, thereby facilitating the installation of the fixed block 1. In specific implementation, the mounting seat 9 can be made of conventional plastic material, and the fixed block 1 and the mounting seat 9 are connected together through an injection molding process, and at the same time, the bottom of the fixed block 1 is exposed to facilitate fitting with the mounting base 4. And the mounting seat 9 can be connected to the mounting base 4 by bonding, screwing, etc.

[0054] In order to further cool the contact blade 201 and the fuse 2, in addition to using the coolant to cool the contact blade 201 through the fixing block 1, Figure 1 , Figure 3As shown, in this embodiment, the mounting base 4 is a liquid cooling plate 10. When the bottom of the fixed block 1 is attached to the liquid cooling plate 10, the liquid cooling plate 10 can directly cool the fixed block 1, and then cool the contact blade 201 and the fuse 2 to dissipate heat, thereby improving the cooling effect. In addition, the liquid inlet pipe 6 and the liquid outlet pipe 7 are connected to the liquid cooling plate 10, that is, the liquid inlet pipe 6 is connected to the liquid inlet pipe 6 formed inside the liquid cooling plate 10, and the liquid outlet pipe 7 is connected to the liquid outlet pipe 7. The cooling system outside the battery pack only needs to transport and recover the coolant to the liquid cooling plate 10, and there is no need to supply coolant to the two fixed blocks 1 additionally. Therefore, the liquid cooling plate 10 is used as the mounting base 4, which simplifies the structural complexity of the fuse cooling structure of this embodiment, facilitates the assembly operation of the fuse cooling structure, and at the same time reduces the space occupied by the fuse cooling structure of this embodiment in the battery pack to a certain extent, thereby improving the compactness of the battery pack.

[0055] In order to further reduce the space occupied by the battery pack, improve the compactness of the battery pack, and facilitate the installation of the fuse cooling structure, the liquid cooling plate 10 of this embodiment is integrated on the battery pack shell, so that the liquid cooling plate 10 constitutes a part of the battery pack shell, so as to reduce the space occupied by the liquid cooling plate 10 in the battery pack, thereby facilitating the installation of the fuse cooling structure. In specific implementation, the liquid cooling plate 10 can cool the battery module in the battery pack at the same time, so the liquid cooling plate 10 can be preferably integrated on the top wall or bottom wall of the battery pack to facilitate cooling the battery module and the fuse cooling structure of this embodiment.

[0056] In order to further improve the thermal conductivity between the fixed block 1 and the liquid cooling plate 10, and improve the cooling performance of the liquid cooling plate 10 on the fixed block 1, in this embodiment, a thermal conductive layer 104 is provided between the bottom of the fixed block 1 and the liquid cooling plate 10, and the thermal conductive layer 104 can fill the gap between the fixed block 1 and the liquid cooling plate 10, so that the liquid cooling plate 10 and the thermal conductive layer 104 are fully in contact, thereby improving the heat exchange effect, and improving the cooling effect and cooling efficiency of the fixed block 1 fuse 2. In specific implementation, the thermal conductive layer 104 can be made of thermal conductive filling materials well known to those skilled in the art, such as thermal conductive silicone grease, imported silicone pads, etc., which can fill the gap between the fixed block 1 and the liquid cooling plate 10 and improve the heat exchange effect. Preferably, the heat-conducting layer 104 may adopt a heat-conducting silicone pad, which has good thermal conductivity, is relatively soft, and has good buffering effect. It can play a buffering role between the battery pack shell, that is, the liquid cooling plate 10 and the fixed block 1, and to a certain extent avoid the vibration of the battery pack from being transmitted to the fuse cooling structure of this embodiment, and prevent the connector 8 from loosening due to vibration.

[0057] In summary, the fuse cooling structure of this embodiment, by providing two fixed blocks 1 connecting the contact blade 201 of the fuse 2, enables the coolant to cool the contact blade 201 of the fuse 2 via the flow channel 101 in the fixed block 1, thereby achieving cooling and heat dissipation of the fuse 2, ensuring the normal operation of the fuse 2, thereby improving the safety performance of the battery pack, and having good practicality.

[0058] Embodiment 2

[0059] The present embodiment relates to a battery pack. In terms of overall structure, the battery pack of the present embodiment is provided with the fuse cooling structure described in the first embodiment, which is used for cooling and dissipating the heat of the fuse 2 in the battery pack.

[0060] The battery pack of this embodiment, by providing the fuse cooling structure as described above, can cool the fuse 2 compared to the prior art, thereby ensuring the normal operation of the fuse 2 and improving the safety performance of the battery pack.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fuse cooling structure, characterized in that: include: Two fixed blocks are respectively connected to two contact blades of the overlapping copper bar on the fuse, and the bottom of each fixed block is attached to a mounting base. A flow channel for the flow of coolant is formed in each fixed block, and the two flow channels are connected through a connecting pipe; A liquid inlet pipe, connected to the flow channel of the fixed block; The liquid outlet pipe is communicated with the flow channel of another fixed block.

2. The fuse cooling structure according to claim 1, characterized in that: The fixing block is made of aluminum alloy.

3. The fuse cooling structure according to claim 2, characterized in that: The inner wall of the flow channel is recessed into the fixing block to form a fin.

4. The fuse cooling structure according to claim 2, characterized in that: The fixing block is coated with an insulating layer, or an insulating gasket is provided between the fixing block and the contact blade.

5. The fuse cooling structure according to claim 1, characterized in that: The contact knife is pressed tightly against the top of the fixing block by a connecting piece, and a groove for accommodating the contact knife is provided on the top of the fixing block.

6. The fuse cooling structure according to claim 1, characterized in that: Also includes: A mounting seat, in which the two fixing blocks are embedded; The mounting seat is fixedly connected to the mounting base, and the bottom of the fixing block is in contact with the mounting base.

7. The fuse cooling structure according to any one of claims 1 to 6, characterized in that: The installation base is a liquid cooling plate, and the liquid inlet pipe and the liquid outlet pipe are connected to the liquid cooling plate.

8. The fuse cooling structure according to claim 7, characterized in that: The liquid cooling plate is integrated on the housing of the battery pack.

9. The fuse cooling structure according to claim 7, characterized in that: A heat conducting layer is provided between the bottom of the fixing block and the liquid cooling plate.

10. A battery pack, characterized in that: The battery pack is provided with a fuse cooling structure according to any one of claims 1 to 9.

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