CN219591607U

CN219591607U - Circuit board and battery pack

Info

Publication number: CN219591607U
Application number: CN202320223613.6U
Authority: CN
Inventors: 柯亨钊; 李帅
Original assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Current assignee: Zhejiang Lera New Energy Power Technology Co Ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-08-25
Anticipated expiration: 2033-01-17

Abstract

The utility model discloses a battery pack and a circuit board thereof. The battery pack comprises a shell, and a battery cell assembly and a circuit board which are arranged in the shell, wherein the shell comprises a bottom plate, and the circuit board is arranged between the bottom plate and the battery cell assembly. The circuit board comprises a substrate and an inductor arranged on the substrate, wherein the substrate is provided with a substrate through hole, the inductor is arranged in the substrate through hole, a gap is formed between the inductor and the inner wall of the substrate through hole, and the gap is communicated with the first side face and the second side face of the substrate. According to the circuit board, the substrate through holes are formed in the substrate to accommodate the inductors, so that the overall thickness of the circuit board is reduced, and the overall volume of the battery pack is reduced. In addition, the gap between the inner wall of the through hole of the substrate and the inductor is used for communicating the two sides of the substrate, so that heat generated by the inductor can be rapidly diffused from the two sides of the substrate, and the heat dissipation effect of the circuit board is improved.

Description

Circuit board and battery pack

Technical Field

The utility model relates to the technical field of battery packs, in particular to a circuit board and a battery pack.

Background

Based on portable use requirements, more and more electric tools employ lithium ion battery packs as a power source. Be provided with a plurality of electric cores and the circuit board of being connected with electric core electricity in the battery package, electric core and circuit board all can produce heat at the during operation, if the radiating effect of battery package inside is poor, higher temperature will influence the normal use of all kinds of electronic devices in the battery package, consequently, improves the inside heat dispersion of battery package and is the problem that needs to solve at present.

Disclosure of Invention

The utility model aims to provide a circuit board with good heat dissipation effect.

Another object of the present utility model is to provide a battery pack with good heat dissipation effect.

In order to achieve the above object, the present utility model provides a circuit board, which comprises a substrate and an inductor disposed on the substrate, wherein the substrate is provided with a substrate through hole, the inductor is disposed in the substrate through hole, a gap is formed between the inductor and an inner wall of the substrate through hole, and the gap is communicated with a first side surface and a second side surface of the substrate.

Further, the surface of one side of the inductor is flush with the first side surface of the substrate, and the surface of the other side of the inductor protrudes out of the second side surface.

Further, the circuit board further comprises a plurality of electronic devices, and each electronic device is arranged on the second side face of the substrate.

Further, at least one electrical interface is disposed at one end of the second side of the substrate, the electrical interface is configured to be electrically connected to an external device, and the substrate through hole is close to the electrical interface, so that the inductor is adjacent to at least one electrical interface.

The utility model also provides a battery pack, which comprises a shell, a battery cell assembly and the circuit board, wherein the battery cell assembly is arranged in the shell, the shell comprises a bottom plate, the circuit board is arranged between the bottom plate and the battery cell assembly, the second side surface of the circuit board is opposite to the battery cell assembly, and the first side surface of the circuit board is opposite to the bottom plate.

Further, the electric core assembly comprises a plurality of electric cores which are arranged in parallel, an inwards concave accommodating space is formed between the adjacent electric cores, the accommodating space is opposite to the second side surface of the circuit board, and one end of the inductor extends into the accommodating space.

Further, the battery pack further comprises at least one electric interface electrically connected with the circuit board, the shell is provided with an electric through hole opposite to the electric interface, the battery pack supplies power to or obtains electric energy from external equipment through the electric interface, the electric interface is located at one end of the second side face of the substrate, and the through hole of the substrate is close to the electric interface, so that the inductor is adjacent to at least one electric interface.

Further, the shell is including setting up around the bottom plate and along the lateral wall that thickness direction extends, the lateral wall includes relative first lateral wall and second lateral wall, electric through-hole is located on the first lateral wall, first lateral wall with be provided with the heat dissipation through-hole on the second lateral wall respectively, the both ends of base plate are close to the heat dissipation through-hole sets up.

Further, a heat dissipation channel allowing air flow to pass through is arranged between the circuit board and the battery cell assembly, and the heat dissipation channel is communicated with the heat dissipation through holes of the first side wall and the second side wall.

Further, the circuit board further comprises a plurality of electronic devices, and each electronic device is arranged close to the end portion of the substrate so as to dissipate heat through the heat dissipation through hole.

Compared with the prior art, the utility model has the beneficial effects that: the circuit board provided by the utility model has good heat radiation performance, is compact in structure and small in overall thickness, and is beneficial to reducing the volume of a battery pack for installing the circuit board.

Drawings

FIG. 1 is a schematic view of one embodiment of a battery pack of the present utility model;

FIG. 2 is a schematic view of one embodiment of a battery pack of the present utility model;

FIG. 3 is a partial schematic view of one embodiment of a battery pack of the present utility model, with the housing not shown;

FIG. 4 is a partial cross-sectional view of one embodiment of a battery pack of the present utility model, with the housing not shown;

in the figure: 1. a housing; 11. a bottom plate; 101. an electrical via; 12. a sidewall; 121. a first sidewall; 122. a second sidewall; 102. a heat dissipation through hole; 103. a heat dissipation channel; 2. a cell assembly; 21. a battery cell; 20. an accommodation space; 3. a circuit board; 31. a substrate; 30. a substrate through hole; 310. a gap; 311. a first side; 312. a second side; 32. an inductance; 321. a connection part; 4. an electrical interface.

Detailed Description

The present utility model will be further described with reference to the following specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

As shown in fig. 1-4, the present utility model provides a battery pack, which comprises a housing 1, a battery cell assembly 2 and a circuit board 3, wherein the battery cell assembly 2 and the circuit board 3 are arranged in the housing 1, the housing 1 comprises a bottom plate 11, and the circuit board 3 is arranged between the bottom plate 11 and the battery cell assembly 2. The circuit board 3 includes a substrate 31 and an inductor 32 disposed on the substrate 31, the substrate 31 has a substrate through hole 30, the inductor 32 is disposed in the substrate through hole 30, a gap 310 is disposed between the inductor 32 and an inner wall of the substrate through hole 30, and the gap 310 communicates with a first side 311 and a second side 312 of the substrate 31.

The circuit board 3 is provided with the substrate through holes 30 on the substrate 31 for accommodating the inductors 32, so that the overall thickness of the circuit board 3 is reduced, and the overall volume of the battery pack is reduced. In addition, the gap between the inner wall of the substrate through hole 30 and the inductor 32 communicates the two sides of the substrate 31, so that the heat generated by the inductor 32 can be rapidly diffused from the two sides of the substrate 31, and the heat dissipation effect of the circuit board 3 is improved.

Those skilled in the art will appreciate that the substrate 31 of the present utility model may be a printed circuit board.

In some embodiments, as shown in fig. 3 and 4, the substrate through hole 30 is circular, the outer diameter of the inductor 32 is smaller than the inner diameter of the substrate through hole 30, and an annular-like gap 310 is formed between the inductor 32 and the inner wall of the substrate through hole 30 after the inductor 32 is disposed in the substrate through hole 30. It should be noted that, the inductor 32 is kept connected with the substrate 31 through the connecting portion 321, the connecting portion 321 is located in the substrate through hole 30, and the space occupied by the connecting portion 321 should be reduced as much as possible, so that the gap 310 between the inductor 32 and the inner wall of the substrate through hole 30 is large enough to ensure a good heat dissipation effect.

Further, the surface of one side of the inductor 32 is flush with the first side 311 of the substrate 31, and the surface of the other side of the inductor 32 protrudes from the second side 312. That is, the inductor 32 protrudes from the substrate 31 toward the cell assembly 2, because the surface of the cell assembly 2 is not planar, the accommodating space 20 is concave on the surface of the cell assembly 2, and the portion of the inductor 32 protruding from the second side 312 of the substrate 31 is accommodated in the concave space of the cell assembly 2, so that the internal space of the battery pack can be fully utilized, and the volume of the battery pack can be reduced.

Specifically, as shown in fig. 4, the battery cell assembly 2 includes a plurality of cylindrical battery cells 21 arranged in parallel, an inward concave accommodating space 20 is formed between adjacent battery cells 21, and a portion of the inductor 32 protruding from the second side 312 of the substrate 31 extends into the accommodating space 20 of the battery cell assembly 2.

Further, the wiring board 3 further includes a plurality of electronic devices 33 provided on the substrate 31. In some embodiments, each electronic device 33 is disposed on the second side 312 of the substrate 31, so that the first side 311 can be attached to the bottom plate 11 to the greatest extent, and each electronic device 33 protruding from the second side 312 can fully utilize the accommodating space 20 on the electrical core assembly 2, thereby fully utilizing the internal space.

Further, the plurality of electronic devices 33 include heat generating devices that are susceptible to generating more heat during operation resulting in a temperature that is higher than the temperature of other surrounding devices, including but not limited to, capacitors. In some embodiments, heat generating devices are disposed around the substrate via 30 so that heat may be dissipated using the gap at the substrate via 30.

Further, the battery pack further comprises at least one electrical interface 4, the electrical interface 4 is electrically connected with the circuit board 3, an electrical through hole 101 corresponding to the electrical interface 4 is arranged on the housing 1, a connector of the external device is suitable for being electrically connected with the electrical interface 4 through the electrical through hole 101, and the battery pack supplies power to or obtains electric energy from the external device through the electrical interface 4. Since the electrical interface 4 is not of a totally enclosed structure, the electrical interface 4 and the electrical through-hole 101 can communicate the inside of the battery pack with the outside, and heat inside the battery pack can be diffused to the outside through the electrical interface 4.

Preferably, the electrical interface 4 is located at an end of the second side 312 of the substrate 31, and the substrate through hole 30 is close to the electrical interface 4, so that the inductor 32 is adjacent to at least one electrical interface 4, and thus the heat generated by the inductor 32 can be rapidly dissipated outwards through the electrical interface 4. In addition, heat generated from the heat generating devices located around the substrate through-holes 30 may also be diffused outside the battery pack through the electrical interface 4.

It should be noted that the electrical interfaces 4 include a plurality of electrical interfaces 4, and the types of the electrical interfaces 4 are the same or different, and the electrical interfaces 4 may be, but are not limited to, type-C interfaces, type-a interfaces, power interfaces, and communication interfaces. The type and shape of the electrical interface 4 is not particularly limited in the present utility model.

Further, the housing 1 includes a side wall 12 provided around the bottom plate 11 and extending in the thickness direction, and the electrical through-hole 101 is located on the side wall 12. The side wall 12 includes opposite first and second side walls 121 and 122, and the first and second side walls 121 and 122 are perpendicular to the length direction of the battery pack. The electrical via 101 is located on the first sidewall 121.

Preferably, the first and second side walls 121 and 122 are further provided with heat dissipation through-holes 102 to enhance the heat dissipation capability of the battery pack. A heat dissipation channel 103 allowing air flow to pass through is arranged between the circuit board 3 and the cell assembly 2, and the heat dissipation channel 103 is communicated with the heat dissipation through holes 102 of the first side wall 121 and the second side wall 122, so that heat of the circuit board 3 and the cell assembly 2 can be diffused outside the battery pack through the heat dissipation through holes 103.

Preferably, two ends of the substrate 31 are close to the heat dissipation through holes 102 of the first side wall 121 and the second side wall 122, respectively, and the heat generating devices on the substrate 31 are disposed close to the ends of the substrate 31, so that the heat generating devices are as close to the heat dissipation through holes 102 as possible, so as to improve the heat dissipation effect. In addition, the heating device is arranged near the end of the substrate 31, so that heat of the heating device can be reduced from being transferred to the battery cells 21 in the battery cell assembly 2, and the over-high temperature of the battery cell assembly 2 can be avoided.

The foregoing has outlined the basic principles, features, and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. The circuit board comprises a substrate and an inductor arranged on the substrate, and is characterized in that a substrate through hole is formed in the substrate, the inductor is arranged in the substrate through hole, a gap is formed between the inductor and the inner wall of the substrate through hole, and the gap is communicated with the first side face and the second side face of the substrate.

2. The circuit board of claim 1, wherein a surface of one side of the inductor is flush with the first side of the substrate and a surface of the other side of the inductor protrudes from the second side.

3. The circuit board of claim 2, further comprising a plurality of electronic devices, each of the electronic devices disposed on the second side of the substrate.

4. A circuit board according to any one of claims 1-3, wherein one end of the second side of the substrate is provided with at least one electrical interface for electrical connection with an external device, and the substrate through-hole is adjacent to the electrical interface such that the inductance is adjacent to at least one of the electrical interfaces.

5. The battery pack comprises a shell, and a battery cell assembly and a circuit board which are arranged in the shell, and is characterized in that the circuit board is any one of claims 1-4, the shell comprises a bottom plate, the circuit board is arranged between the bottom plate and the battery cell assembly, a second side surface of the circuit board is opposite to the battery cell assembly, and a first side surface of the circuit board is opposite to the bottom plate.

6. The battery pack of claim 5, wherein the cell assembly comprises a plurality of cells arranged in parallel, an inward concave accommodating space is formed between adjacent cells, the accommodating space is opposite to the second side of the circuit board, and one end of the inductor extends into the accommodating space.

7. The battery pack of claim 5, further comprising at least one electrical interface electrically connected to the circuit board, the housing having an electrical through-hole opposite the electrical interface, the battery pack supplying power to or drawing power from an external device through the electrical interface, the electrical interface being located at an end of the second side of the substrate, the substrate through-hole being proximate the electrical interface such that the inductor is adjacent to at least one of the electrical interfaces.

8. The battery pack according to claim 7, wherein the housing includes a sidewall disposed around the bottom plate and extending in a thickness direction, the sidewall includes a first sidewall and a second sidewall opposite to each other, the electrical via is located on the first sidewall, heat dissipation vias are respectively provided on the first sidewall and the second sidewall, and both ends of the substrate are disposed near the heat dissipation vias.

9. The battery pack of claim 8, wherein a heat dissipation channel is provided between the circuit board and the cell assembly to allow air flow therethrough, the heat dissipation channel communicating with the heat dissipation through holes of the first and second sidewalls.

10. The battery pack of claim 8, wherein the circuit board further comprises a plurality of electronic devices, each of the electronic devices being disposed near an end of the substrate to dissipate heat through the heat dissipation through-holes.