BDU device and battery pack

Abstract

The utility model provides a BDU device and a battery pack, and relates to the technical field of batteries. The BDU device comprises a shell, a heating element and a heat conducting plate, an opening is formed in one end of the shell; the heating element is arranged in the shell; the heat conducting plate is provided with a first side and a second side which are opposite, the first side is located in the opening and thermally coupled with the heating element, and the second side is located outside the shell. According to the BDU device, the heat conduction plate is thermally coupled with the heating element of the BDU device, so that the BDU device can dissipate heat through the heat conduction plate, the heat dissipation efficiency of the BDU device is improved, the current-carrying capacity of the BDU device is improved, and finally the reliability of the BDU device is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a BDU device and a battery pack. Background Art

[0002] In the related art, in order to improve the reliability of the battery pack, the battery pack is usually equipped with a BDU (Battery Disconnect Unit) device. The BDU device includes a housing and a number of electronic devices with high heat generation arranged in the housing, such as conductive bars, fuses, relays, etc. Due to the space limitations of the battery pack, the components in the battery pack are compactly arranged. Therefore, the current BDU device mainly uses natural cooling to dissipate heat. This heat dissipation method is inefficient, causing the BDU device to be in a high temperature environment for a long time, resulting in low reliability of the BDU device. Utility Model Content

[0003] The embodiments of the present application provide a BDU device and a battery pack, which can improve the problem of low heat dissipation efficiency of the BDU device.

[0004] In a first aspect, an embodiment of the present application provides a BDU device, which includes a shell, a heating element and a heat conducting plate; an opening is provided at one end of the shell; the heating element is arranged in the shell; the heat conducting plate has a first side and a second side opposite to each other, the first side is located in the opening and thermally coupled to the heating element, and the second side is located outside the shell.

[0005] In one embodiment, the heating element comprises a conductive row, both ends of the conductive row are connecting ends, and at least a portion of the conductive row except the connecting ends is protruding toward the heat conducting plate and abuts against the first side.

[0006] In one embodiment, the heat conducting plate is elastic.

[0007] In one embodiment, the heat conducting plate is a silicone heat conducting pad or a rubber heat conducting plate.

[0008] In one embodiment, the distance between the second side and the outer side surface of the shell is d1, which satisfies 1mm≤d1≤4mm.

[0009] In one embodiment, the heat conducting plate includes a heat conducting plate body and an insulating film. The heat conducting plate body has a first side and a second side. The insulating film covers at least the first side or the second side.

[0010] The thickness of the insulating film is d2, satisfying 0.1 mm ≤ d2 ≤ 0.2 mm.

[0011] In one embodiment, the insulating film is a PET insulating film.

[0012] In one embodiment, the heat conducting plate is snap-fitted to the opening.

[0013] In a second aspect, an embodiment of the present application further provides a battery pack, which includes a box body and the aforementioned BDU device; the box body has a accommodating cavity; the BDU device is arranged in the accommodating cavity, and the second side is thermally coupled to the cavity wall of the accommodating cavity.

[0014] In one embodiment, the heat conducting plate is in a compressed state.

[0015] In one embodiment, the cavity wall thermally coupled to the accommodating cavity and the second side is the first cavity wall, and the distance between the first cavity wall and the shell is D; when the heat conducting plate is in the original state, the distance between the second side and the shell is d1, satisfying: D<d1.

[0016] In one embodiment, 0.4 mm ≤ d1 - D ≤ 0.7 mm.

[0017] In one embodiment, the BDU device is detachably fixed in the accommodating cavity by a fixing member.

[0018] Beneficial effects of the embodiments of the present application:

[0019] In the embodiments of the present application, by thermally coupling the heat conducting plate with the heating element of the BDU device, the BDU device can dissipate heat through the heat conducting plate, thereby improving the heat dissipation efficiency of the BDU device, further improving the current carrying capacity of the BDU device, and ultimately improving the reliability of the BDU device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a structural schematic diagram of a BDU device provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of the structure of a conductive bar provided in an embodiment of the present application;

[0023] Figure 3 is a schematic diagram of the conductive bar abutting against the heat conducting plate provided by an embodiment of the present application;

[0024] Figure 4 yes Figure 1 The enlarged view of point A in the middle;

[0025] Figure 5 It is a structural schematic diagram of a BDU device provided in an embodiment of the present application installed in a box;

[0026] Figure 6yes Figure 5 Enlarged view of point B in the middle.

[0027] Description of reference numerals:

[0028] 001-BDU device;

[0029] 011-shell; 111-opening; 112-ear plate; 012-heating element; 121-conductive bar; 013-heat conducting plate; 131-heat conducting plate body; 132-insulating film;

[0030] 021-bottom guard plate; 031-bolt. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0032] In addition, it should be understood that the specific embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0033] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] The terms "comprises," "includes," or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0036] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0037] See also Figure 1 , Figure 1 001 is a schematic diagram of the structure of the BDU device 001 provided in an embodiment of the present application. The embodiment of the present application provides a BDU device 001, which includes a shell 011, a heating element 012 and a heat conducting plate 013. An opening 111 is provided at one end of the shell 011. The heating element 012 is disposed in the shell 011. The heat conducting plate 013 has a first side and a second side opposite to each other. The first side is located in the opening 111 and is thermally coupled to the heating element 012. The second side is located outside the shell 011.

[0038] It can be understood that when the BDU device 001 is applied to a battery pack, the BDU device 001 is installed in the box of the battery pack. Specifically, the BDU device 001 is installed on the bottom guard plate of the battery pack, with the first side being in contact with the heating element 012 and the second side being in contact with the bottom guard plate. The heat conducting plate 013 conducts the heat of the heating element 012 to the bottom guard plate, and the outer surface of the bottom guard plate is exposed to the atmosphere to dissipate heat.

[0039] The heating element 012 includes but is not limited to a conductive bar 121, a relay, and a fuse.

[0040] The heat conducting plate 013 may be a silicone heat conducting pad, a rubber heat conducting plate, or a metal plate coated with an insulating layer.

[0041] In this embodiment, on the one hand, by thermally coupling the heat conducting plate 013 with the heating element 012 of the BDU device 001, the BDU device 001 can dissipate heat through the heat conducting plate 013, thereby improving the heat dissipation efficiency of the BDU device 001, and further improving the current carrying capacity of the BDU device 001, and finally improving the reliability of the BDU device 001; on the other hand, by arranging the second side outside the shell 011, a gap is provided between the side of the shell 011 close to the inner wall of the box and the box, thereby avoiding contact between the shell 011 and the box, and further avoiding excessive installation locking force of the BDU device 001, which may cause the shell 011 to squeeze the box and crack.

[0042] See also Figure 2 , Figure 2 In one embodiment, the heating element 012 includes a conductive row 121, both ends of the conductive row 121 are connection ends, and at least a portion of the conductive row 121 other than the connection ends is protruded toward the heat conducting plate 013 and abuts against the first side. Figure 3 As shown, Figure 3 It is a schematic diagram of the conductive bar 121 provided in an embodiment of the present application abutting against the heat conducting plate 013 .

[0043] It can be understood that the conductive bar 121 is used to electrically connect some electrical components of the BDU device 001 , such as the electrical connection between the high-voltage input port and the high-voltage output port of the BDU device 001 .

[0044] Exemplarily, the conductive bus 121 is a copper bus.

[0045] In this embodiment, the middle portion of the conductive bar 121 is protruded toward the heat conducting plate 013 and abuts against the first side, so that the conductive bar 121 can be thermally coupled with the heat conducting plate 013, thereby allowing the heat conducting plate 013 to dissipate heat from the conductive bar 121, and the conductive bar 121 can also realize electrical connection between related components.

[0046] In one embodiment, the heat conducting plate 013 is elastic. For example, the heat conducting plate 013 is a silicone heat conducting pad, and its thermal conductivity is above 3 W / mK.

[0047] It can be understood that the BDU device 001 is detachably fixed in the box body by bolts 031. In addition, when the BDU device 001 is installed in the box body, the heat conducting plate 013 is located between the heating element 012 and the box wall and is in a compressed state.

[0048] In this embodiment, by using an elastic heat conducting plate 013, the heat conducting plate 013 can be compressed when installing the BDU device 001. In this way, on the one hand, a pre-tightening force can be formed at the heat conducting plate 013 to prevent the bolts 031 that lock the BDU device 001 to the box from loosening, thereby improving the stability of the installation of the BDU device 001; on the other hand, by squeezing the heat conducting plate 013, it can better fit with the heating element 012 and the box, thereby improving the heat dissipation efficiency of the BDU device 001.

[0049] See also Figure 4 , Figure 4 yes Figure 1 The enlarged view of the point A in the middle. In one embodiment, the distance between the second side and the outer side surface of the housing 011 is d1, which satisfies 1mm≤d1≤4mm.

[0050] It will be understood that d1 includes but is not limited to 1mm, 1.5mm, 1.8mm, 2mm, 2.6mm, 3mm, 3.3mm, 3.8mm, and 4mm.

[0051] In this embodiment, by limiting the distance between the second side and the shell 011, on the one hand, it can be avoided that the distance between the second side and the shell 011 is too small, resulting in the contact between the shell 011 and the box body, thereby preventing the installation locking force of the BDU device 001 from being too large, resulting in the shell 011 squeezing the box body and cracking; on the other hand, it can be avoided that the distance between the second side and the shell 011 is too large, resulting in a decrease in the thermal conductivity of the heat conducting plate 013.

[0052] See also Figure 4 In one embodiment, the heat conducting plate 013 includes a heat conducting plate 013 body and an insulating film 132 . The heat conducting plate body 013 has a first side and a second side. The insulating film 132 covers at least the first side or the second side.

[0053] Exemplarily, the insulating film 132 completely covers the surface of the heat conducting plate 013 .

[0054] The heat conducting plate 013 body is a silicone heat conducting pad. The insulating film 132 includes but is not limited to a PET insulating film 132 and a PC insulating film 132. Since the thermal conductivity of the PET insulating film 132 is higher than that of the PC insulating film 132, the insulating film 132 is optionally a PET insulating film 132.

[0055] In this embodiment, by covering the first side or the second side with the insulating film 132 , the insulation between the heating element 012 and the battery box can be improved, thereby ensuring the normal operation of the BDU device 001 and further improving the reliability of the BDU device 001 .

[0056] See also Figure 4In one embodiment, the thickness of the insulating film 132 is d2, satisfying 0.1 mm≤d2≤0.2 mm.

[0057] It will be understood that d2 includes but is not limited to 0.1mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.17mm, 0.18mm, 0.19mm, and 0.2mm.

[0058] In this embodiment, by limiting the thickness of the insulating film 132, on the one hand, it can avoid the insulating film 132 being scratched due to the thickness being too small, thereby ensuring the insulation between the heating element 012 and the box body; on the other hand, it can avoid the insulating film 132 being too thick, resulting in a decrease in the thermal conductivity of the heat conducting plate 013.

[0059] In one embodiment, the heat conducting plate 013 is engaged with the opening 111 .

[0060] It can be understood that the opening 111 can be interference-fitted with the heat conducting plate 013 to achieve snap-fitting between the heat conducting plate 013 and the opening 111 .

[0061] In this embodiment, the heat conducting plate 013 is engaged with the opening 111, thereby improving the connection stability between the heat conducting plate 013 and the housing 011, thereby preventing the heat conducting plate 013 from falling out of the opening 111 of the housing 011. Thus, the convenience of installing the BDU device 001 can be improved.

[0062] See also Figure 5 , Figure 5 : is a schematic diagram of the structure of the BDU device 001 provided in the embodiment of the present application installed in the box. Correspondingly, the embodiment of the present application also provides a battery pack, which includes a box and the aforementioned BDU device 001. The box has a receiving cavity. The BDU device 001 is arranged in the receiving cavity. The second side is thermally coupled with the cavity wall of the receiving cavity. Specifically, the second side is thermally coupled with the bottom guard plate 021.

[0063] It can be understood that the BDU device 001 is detachably fixed in the accommodating cavity by a fixing member. The fixing member includes a bolt 031, a lug is provided on the outer wall of the housing 011, a through hole for the bolt 031 is provided on the lug, the end of the rod of the bolt 031 passes through the through hole of the bolt 031 and is threadedly connected to the housing, the head of the bolt 031 abuts against the lug, and the axial direction of the bolt 031 is perpendicular to the heat conducting plate 013, thereby pressing the heating element 012, the heat conducting plate 013 and the bottom guard plate 021 in sequence.

[0064] In this embodiment, by adopting the above-mentioned BDU device 001, the reliability of the battery pack can be improved.

[0065] In one embodiment, the heat conducting plate 013 is in a compressed state. Specifically, the cavity wall thermally coupled to the second side of the accommodating cavity is the first cavity wall, and the distance between the first cavity wall and the housing 011 is D. Figure 6 As shown, Figure 6 yes Figure 5 The enlarged view of the B in the figure. When the heat conducting plate 013 is in the original state, the distance between the second side and the housing 011 is d1, which satisfies: D<d1.

[0066] It can be understood that the heat conducting plate 013 has elasticity. The heat conducting plate 013 is in the original state, which means that the heat conducting plate 013 is not deformed by external force. In the original state, the heat conducting plate 013 is in a natural state, and the heat conducting plate 013 is not stretched, compressed or twisted.

[0067] Exemplarily, 0.4 mm ≤ d1 - D ≤ 0.7 mm. Specifically, the difference between D and d1 includes but is not limited to 0.4 mm, 0.5 mm, 0.6 mm, and 0.7 mm. It can be understood that if the difference is too large, it means that the thickness of the heat conducting plate 013 is relatively large, and if the thickness of the heat conducting plate 013 is too large, it is not conducive to the heat conduction of the heat conducting plate 013; and if the difference is too small, it means that when the BDU device 001 is installed, the shell 011 is easy to abut against the box and crack.

[0068] In this embodiment, the heat conducting plate 013 is in a compressed state through the above-mentioned limitation. Thus, on the one hand, a pre-tightening force can be formed at the heat conducting plate 013 to prevent the bolts 031 that lock the BDU device 001 to the box from loosening, thereby improving the stability of the installation of the BDU device 001; on the other hand, the heat conducting plate 013 can be squeezed to better fit with the heating element 012 and the box, thereby improving the heat dissipation efficiency of the BDU device 001.

[0069] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A BDU device, characterized in that: include: A shell having an opening at one end; A heating element is disposed in the housing; The heat conducting plate has a first side and a second side opposite to each other, wherein the first side is located in the opening and thermally coupled to the heating element, and the second side is located outside the housing.

2. The BDU device according to claim 1, characterized in that: The heating element comprises a conductive row, both ends of which are connecting ends, and at least a portion of the conductive row except the connecting ends protrudes toward the heat conducting plate and abuts against the first side.

3. The BDU device according to claim 1, characterized in that: The heat conducting plate is elastic.

4. The BDU device according to claim 3, characterized in that: The heat conducting plate is a silicone heat conducting pad or a rubber heat conducting plate.

5. The BDU device according to any one of claims 1 to 4, characterized in that: The distance between the second side and the outer side surface of the shell is d1, which satisfies 1mm≤d1≤4mm.

6. The BDU device according to any one of claims 1 to 4, characterized in that: The heat conducting plate includes a heat conducting plate body and an insulating film. The heat conducting plate body has the first side and the second side. The insulating film covers at least the first side or the second side.

7. The BDU device according to claim 6, characterized in that: The thickness of the insulating film is d2, satisfying 0.1 mm≤d2≤0.2 mm.

8. The BDU device according to claim 6, characterized in that: The insulating film is a PET insulating film.

9. The BDU device according to any one of claims 1 to 4, characterized in that: The heat conducting plate is clamped with the opening.

10. A battery pack, characterized in that: include: A box body having a containing cavity; The BDU device according to any one of claims 1 to 9, wherein the BDU device is disposed in the accommodating cavity, and the second side is thermally coupled to a cavity wall of the accommodating cavity.

11. A battery pack according to claim 10, characterized in that: The heat conducting plate is in a compressed state.

12. A battery pack according to claim 11, characterized in that: The cavity wall thermally coupled between the accommodating cavity and the second side is the first cavity wall, and the distance between the first cavity wall and the shell is D; when the heat conducting plate is in the original state, the distance between the second side and the shell is d1, satisfying: D<d1.

13. A battery pack according to claim 12, characterized in that: 0.4mm≤d1-D≤0.7mm.

14. The battery pack according to claim 10, characterized in that: The BDU device is detachably fixed in the accommodating cavity by a fixing member.

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