CN219017812U - Battery pack and electric tool - Google Patents

Abstract

The application discloses battery package and electric tool, including shell and electric core subassembly, the electric core subassembly includes a plurality of electric cores, and the shell has top surface and bottom surface, and each electric core sets gradually in the shell from the top surface to the bottom surface, and the top surface has the vent, and the bottom surface has the vent down, has at least one heat dissipation channel of vent and vent down on the intercommunication in the shell, and the air current passes through each electric core in proper order when flowing in heat dissipation channel. When the battery pack is assembled in the battery compartment, the battery pack has good heat dissipation capacity, can avoid faults caused by overhigh heat of the battery pack, and is better in safety.

Description

Battery pack and electric tool

Technical Field

The present application relates to the field of batteries, and more particularly, to a battery pack and an electric tool.

Background

Based on portable use requirements, more and more power tools employ battery packs as a power source. The battery pack is generally a lithium ion battery pack, more heat can be generated in the use process, the heat dissipation effect of the conventional battery pack is generally poor, the battery pack is easy to fail due to overhigh heat, and certain potential safety hazards exist.

Disclosure of Invention

An object of the present application is to provide a battery pack with a good heat dissipation effect and an electric tool having the battery pack.

In order to achieve the above object, the present application provides a battery pack, including shell and electric core subassembly, electric core subassembly includes a plurality of electric cores, the shell has top surface and bottom surface, each electric core is from the top surface to the bottom surface sets gradually in the shell, the top surface has last vent, the bottom surface has down the vent, have in the shell intercommunication go up the vent with at least one heat dissipation passageway of vent down, the air current is in each electric core in proper order when flowing in the heat dissipation passageway.

Further, the battery pack further comprises a circuit board arranged in the shell, the circuit board is electrically connected with the battery cell assembly, a gap is reserved between the circuit board and the battery cell assembly to form a first heat dissipation channel, an electric interface matched with external equipment is connected to the circuit board, and the electric interface is located on an air flow path of the first heat dissipation channel.

Further, the electrical interface comprises at least one first interface and at least one second interface, the first interface and the second interface are adapted to different external devices, and each plug interface of the electrical interface is arranged towards the bottom surface.

Further, each plug-in interface of the electrical interface is arranged in a row along one side with a longer length of the bottom surface, and the lower vent is arranged in parallel with the electrical interface.

Further, the electrical interface and the lower vent together form a lower vent area, the upper vent forms an upper vent area, and the lower vent area has a larger cross-sectional area through which air flows than the upper vent area.

Further, at least one of the cells of the cell assembly is offset to the peripheral side so as to be offset from an adjacent cell, so that a connecting line of the centers of the cells is a broken line.

Further, the shell comprises a circumferential side surface connected with the top surface and the bottom surface, the circumferential side surface comprises a first side surface, a second side surface, a third side surface and a fourth side surface which are sequentially connected, the axis of the battery cell is perpendicular to the second side surface and the fourth side surface, a circuit board is arranged between the battery cell assembly and the first side surface, a second heat dissipation channel is formed between the battery cell assembly and the third side surface, and the battery cells are arranged at intervals.

Further, when the central connecting lines of one pair of adjacent electric cores are positioned on the horizontal plane, an included angle is formed between the central connecting lines of at least another pair of adjacent electric cores and the horizontal plane, and the included angle is larger than 0 DEG and smaller than 30 deg.

Further, the included angle is 1-10 degrees.

The application still provides an electric tool, including battery compartment and detachably assemble in the battery package of battery compartment, the battery package is preceding battery package, electric tool has the air current and carries the structure, set up the air current passageway in the battery compartment in order to communicate the air current carries the structure.

Further, when the battery pack is assembled to the battery compartment, the lower vent of the battery pack is opposite to the air inlet of the air flow passage.

When the battery pack is assembled in the battery compartment of the external equipment, the battery pack has good heat dissipation capacity, faults caused by overhigh heat of the battery pack can be avoided, and the safety is better.

Drawings

FIG. 1 is a front view of one embodiment of a battery pack of the present application;

FIG. 2 is a partial schematic view of one embodiment of a battery pack of the present application;

FIG. 3 is a schematic view of a battery compartment of the battery pack of the present application assembled into an external device;

FIG. 4 is a schematic perspective view of one embodiment of a battery pack of the present application;

FIG. 5 is another angular perspective view of one embodiment of a battery pack of the present application;

FIG. 6 is a cross-sectional view of one embodiment of a battery pack of the present application;

FIG. 7 is a partial schematic view of one embodiment of a battery pack of the present application, with the housing not shown;

FIG. 8 is a cross-sectional view of one embodiment of a battery pack of the present application;

in the figure: 100. a battery pack; 1. a housing; 10. a heat dissipation channel; 10a, a first heat dissipation channel; 10b, a second heat dissipation channel; 11. a circumferential side; 111. a first side; 112. a second side; 113. a third side; 114. a fourth side; 12. a top surface; 120. an upper vent; 13. a bottom surface; 130. a lower vent; 2. an electrical interface; 21. a first interface; 22. a second interface; 4. a cell assembly; 41. a battery cell; 42. a bracket; 5. a circuit board; 300. a battery compartment; 301. an air flow channel.

Detailed Description

The present application will be further described with reference to the 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.

In the description of the present application, it should be noted that, for the azimuth terms such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific protection scope of the present application that the device or element referred to must have a specific azimuth configuration and operation, as indicated or implied.

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

In one embodiment of the present application, a battery pack 100 is provided, as shown in fig. 3, the battery pack 100 is adapted to be fitted into a battery compartment 300 of an external device in a first direction, so that the battery pack 100 is electrically connected with the external device. It should be noted that, the external device may be an electric device, such as an electric tool, so that the battery pack 100 supplies power to the electric device; the external device may also be a charging device such as an energy storage power source or the like, so that the battery pack 100 obtains electric power from the charging device.

As shown in fig. 1 and 2, the battery pack 100 includes a case 1 and a battery cell assembly 4 provided in the case 1. The housing 1 comprises a circumferential side 11, a top 12 and a bottom 13 at two ends of the circumferential side 11, wherein the top 12 and the bottom 13 are respectively provided with an upper vent 120 and a lower vent 130, at least one heat dissipation channel 10 which is communicated with the upper vent 120 and the lower vent 130 is arranged in the housing 1, the heat dissipation channel 10 passes through the battery cell assembly 4, and therefore when air flows in the heat dissipation channel 10, heat of the battery cell assembly 4 can be carried out of the housing 1. The cell assembly 4 includes a plurality of cells 41, each cell 41 being disposed in the housing 1 in sequence from the top surface 12 to the bottom surface 13, and an air flow passing through each cell 41 in sequence while flowing in the heat dissipation channel 10. In this application, each cell 41 is sequentially disposed along the direction of the heat dissipation channel 10, so that each cell 41 can obtain sufficient heat dissipation.

It should be noted that the external device has an air flow conveying structure (not shown in the figure) capable of dissipating heat. As shown in fig. 3, an airflow channel 301 is formed in a battery compartment 300 of an external device to communicate with an airflow conveying structure, when the battery pack 100 is assembled into the battery compartment 300, the lower vent 130 of the battery pack 100 can communicate with the airflow channel 301 in the battery compartment 300, so that high-temperature airflow discharged from the lower vent 130 can be discharged out of the battery compartment 300 through the airflow channel 301, and the excessive temperature of the battery compartment 300 is avoided.

Preferably, the lower vent 130 of the battery pack 100 can be opposite the airflow channel 301 in the battery compartment 300 when the battery pack 100 is assembled into the battery compartment 300.

Further, the battery pack 100 further includes a circuit board 5 disposed in the housing 1, the circuit board 5 is electrically connected to the battery cell assembly 4, a gap is formed between the circuit board 5 and the battery cell assembly 4 to form a first heat dissipation channel 10a, one end of the heat dissipation channel 10a is communicated with the upper vent 120, and the other end is communicated with the lower vent 130. The circuit board 5 and the battery cell assembly 4 are arranged at intervals, so that adverse effects caused by heat of the battery cell 4 or the circuit board 5 on the other party can be avoided, meanwhile, gaps between the circuit board 5 and the battery cell assembly 4 are respectively communicated with the upper vent 120 and the lower vent 130, heat dissipation can be carried out on the battery cell assembly 4 and the circuit board 5, and the heat dissipation effect is better.

Further, as shown in fig. 6 and 7, an electrical interface 2 for mating with an external device is connected to the circuit board 5, and the electrical interface 2 is located on the air flow path of the first heat dissipation path 10 a. The beneficial effects of arranging the electrical interface 2 on the heat dissipation channel are as follows: 1. the electrical interface 2 can obtain good heat dissipation, and the use of the electrical interface 2 can be prevented from being influenced by high temperature; 2. the electrical interface 2 may also be used for heat dissipation when the electrical interface 2 communicates with the outside.

Further, as shown in fig. 7, the electrical interface 2 includes at least a first interface 21 and at least a second interface 22, the first interface 21 and the second interface 22 are adapted to different external devices, and the plug interfaces of the first interface 21 and the second interface 22 are disposed towards the bottom surface 13. Preferably, the first interface 21 is a tool interface for electrically connecting with external devices such as a power tool, and the second interface is a 3C interface for electrically connecting with various electronic devices, for example, the second interface is a USB interface, a type-C interface, and the like. When the battery pack 100 is assembled in an external device, the electrical connection is generally performed only through the first interface 21 or the second interface 22, that is, the first interface 21 and the second interface 22 are not used at the same time, which means that when the battery pack 100 is assembled in an external device, at least a part of the plug-in ports of the electrical interface 2 are idle, and the part of the plug-in ports can discharge the heat in the housing 1 into the battery compartment 300, and then is discharged through the air flow channel 301 in the battery compartment 300. In addition, each plug interface is arranged on the bottom surface 13, so that the air flow channel 301 in the battery compartment 300 is beneficial to intensively discharging the heat discharged by the electric interface 2 and the lower vent 130.

In a specific embodiment, as shown in fig. 5 and 7, the electrical interface 2 includes a first interface 21 and two second interfaces 22, where the first interface 21 includes a positive interface, a negative interface, and a plurality of communication interfaces, and one of the second interfaces 22 is a USB interface, and the other of the second interfaces 22 is a type-c interface. Further, the plug interfaces of the electrical interface 2 are arranged in a row in sequence, and the lower vent 130 is arranged on the other side of the bottom surface 13 in parallel with the plug interfaces. In view of the large number of the plug-in ports of the electrical connector 2, it is preferable that each plug-in port is arranged along one side of the longer length of the bottom surface 13 (i.e., the width direction of the battery pack 100), and the electrical connector 2 and the lower vent 130 are arranged along one side of the shorter length of the bottom surface 13 (i.e., the height direction of the battery pack 100).

It should be noted that the electrical interface 2 and the lower vent 13 together form a lower vent area, the upper vent 14 forms an upper vent area, and the cross-sectional area of the lower vent area through which the air flow can pass is larger than the cross-sectional area of the upper vent area through which the air flow can pass. By changing the air flow throughput at both ends, the flow speed of the air flow in the housing 1 can be increased after the battery pack 100 is inserted into the battery compartment 300, and the heat dissipation efficiency can be improved.

Further, as shown in fig. 4 and 5, the circumferential side 11 of the housing 1 includes a first side 111, a second side 112, a third side 113, and a fourth side 114 that are sequentially connected, the first side 111 being opposite to the third side 113, and the second side 112 being opposite to the fourth side 114. In a preferred embodiment, the first side 111 and the third side 113 are parallel to each other, and the first side 111 and the third side 113 may be planar or curved, and when curved, the maximum projection surfaces of the two are parallel to each other. Similarly, the second side 112 and the fourth side 114 are parallel to each other, and the second side 112 and the fourth side 114 may be flat or curved, and when curved, the maximum projection surfaces of the two sides are parallel to each other.

Further, the battery cells 41 are columnar, and the axis of each battery cell 41 is perpendicular to the second side 112 and the fourth side 114 of the housing 1. The first heat dissipation channel 10a is located on a side of the battery cell 41 near the first side 113.

As shown in fig. 6, at least one cell 41 of the cell assembly 4 is shifted to the circumferential side, so that a misalignment is generated with an adjacent cell 41, so that a line connecting centers of the respective cells 41 is a broken line (i.e., non-straight line), thereby reducing the length of the cell assembly 4. Meanwhile, due to the fact that the partial electric cores 41 are arranged in a staggered mode, the distances between the electric cores 41 and the third side face 113 are different, the contact area between the electric cores 41 and air flow can be increased, larger gaps are formed between some electric cores 41 and the third side face 113, and more air flow is allowed to pass through the larger gaps, so that heat dissipation can be achieved rapidly.

The cells 41 are offset to the circumferential side such that: when a certain cell 41 is used as a reference, at least one other cell 41 is closer to or further away from the circuit board 5 than the reference cell 41, and the axis of each cell 41 is parallel to the circuit board 5, so that the exposed area of the cell 41 offset from the reference cell 41 in the first heat dissipation channel 10a is different, and the contact area of the cell 41 with the air current is increased.

It should be noted that, the principle of increasing the contact area between the battery cells 41 and the air flow by arranging the battery cells 41 in a staggered manner is as follows: if the centers of the electric cores 41 are arranged along a straight line, the openings of the gaps formed between the adjacent electric cores 41 are basically vertical to the direction of the air flow, so that the circulation efficiency of the air flow at the gaps is lower, and the surfaces of the electric cores 41 are difficult to form effective contact with the air flow; after each cell 41 is arranged in a staggered manner, the openings of the gaps formed between the adjacent cells 41 are not perpendicular to the air flow direction, so that the air flow circulation efficiency at the gaps is improved, more surfaces of the cells 41 are effectively contacted with the air flow, and the heat dissipation effect is improved.

The misplacement arrangement of the battery cells 41 is beneficial to the reduction of the whole length and the improvement of the heat dissipation effect: on the one hand, when the cell 41 is dislocated to the side far away from the first heat dissipation channel 10a, a larger gas flow space is formed at the cell 41, and more surfaces of the cell 41 on the upper side and the lower side of the cell 41 are positioned in the first heat dissipation channel 10a, so that heat dissipation is facilitated; on the other hand, since some of the battery cells 41 are arranged in a staggered manner, a larger gap is formed between another part of the battery cells 41 and the third side 113, and the gaps can also be used for heat dissipation, so that the heat dissipation effect is improved.

In some embodiments, as shown in fig. 6, a second heat dissipation channel 10b is formed between the battery module 4 and the third side 113, that is, one end of the second heat dissipation channel 10b is connected to the upper vent 120, and the other end is connected to the lower vent 130.

In some embodiments, the respective electric cells 41 are arranged at intervals, so that the second heat dissipation channel 10b and the first heat dissipation channel 10a are communicated through a gap between the electric cells 41, and an air flow can flow between the second heat dissipation channel 10b and the first heat dissipation channel 10a, thereby achieving sufficient heat dissipation to the electric cells 41.

It should be noted that, the arrangement manner of each cell 41 may be orderly staggered in a zigzag manner; the cells 41 may be arranged in a staggered manner, and the comparison is not particularly limited.

In one embodiment, when the first side 111 of the battery pack 100 is horizontally placed, the center line (indicated by a dotted line in fig. 8) of at least one pair of adjacent battery cells 41 forms an angle α with the horizontal plane (indicated by a dotted line in fig. 8), and the angle α is greater than 0 ° and less than 30 °. The displacement of the cell 41 in a staggered manner should not be too great, which would lead to a large increase in the volume of the housing 1. Preferably, the included angle α is 1 ° to 10 °, more preferably, the included angle α is 5 ° to 10 °.

It should be noted that the center of the cell 41, i.e., the geometric center thereof. Preferably, the battery cell 41 is columnar, and the center of the battery cell 41 is located on the axis of the battery cell 41.

In some embodiments, the upper vent 120 includes a plurality of through holes distributed over the top surface 12, the lower vent 130 includes a plurality of through holes distributed over the bottom surface 13, the apertures of the through holes are not too large to affect the strength of the top and bottom surfaces 12, 13, and external large particle contaminants are easily introduced into the housing 1. Through holes with smaller apertures can be adopted, and the heat dissipation effect is improved by increasing the number of the through holes.

In some embodiments, the cell assembly 4 includes a plurality of cylindrical cells 41 and a holder 42 for holding each cell 41 in a preset position, as shown in fig. 7. The brackets 42 are disposed at two ends of the battery cell 41, so as to avoid the influence of the bracket 42 on the heat dissipation effect due to the blocking of the heat dissipation channel.

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

Claims (10)

1. The battery pack comprises a shell and a battery cell assembly, wherein the battery cell assembly comprises a plurality of battery cells, the shell is provided with a top surface and a bottom surface, and the battery cell assembly is characterized in that each battery cell is sequentially arranged in the shell from the top surface to the bottom surface, the top surface is provided with an upper ventilation opening, the bottom surface is provided with a lower ventilation opening, at least one heat dissipation channel which is communicated with the upper ventilation opening and the lower ventilation opening is arranged in the shell, and air flows sequentially pass through each battery cell when flowing in the heat dissipation channel.

2. The battery pack of claim 1, further comprising a circuit board disposed within the housing, the circuit board being electrically connected to the cell assembly with a gap therebetween to form a first heat dissipation channel, the circuit board having an electrical interface coupled thereto for mating with an external device, the electrical interface being located in an airflow path of the first heat dissipation channel.

3. The battery pack of claim 2, wherein the electrical interface comprises at least a first interface and at least a second interface, the first interface and the second interface being adapted to different external devices, the mating interfaces of the first interface and the second interface being disposed toward the bottom surface.

4. A battery pack according to claim 3, wherein the respective plug-in ports of the electrical ports are arranged in a row in sequence along the longer side of the bottom surface, and the lower vent is arranged in parallel with the electrical ports.

5. The battery pack of claim 4, wherein the electrical interface and the lower vent together form a lower vent area, the upper vent forming an upper vent area, the lower vent area having a larger cross-sectional area through which air can pass than the upper vent area.

6. The battery pack of any one of claims 1-5, wherein at least one of the cells of the cell assembly is offset circumferentially to be offset from an adjacent cell such that a line connecting centers of the cells is a fold line.

7. The battery pack of claim 6, wherein the housing includes a circumferential side connecting the top and bottom surfaces, the circumferential side including a first side, a second side, a third side, and a fourth side connected in sequence, the axis of the cell being perpendicular to the second side and the fourth side, a circuit board being disposed between the cell assembly and the first side, a first heat dissipation channel being formed between the cell assembly and the circuit board, a second heat dissipation channel being formed between the cell assembly and the third side, the cells being disposed at intervals from each other.

8. The battery pack of claim 6, wherein when the center lines of one pair of adjacent cells are located in a horizontal plane, the center lines of at least another pair of adjacent cells form an included angle with the horizontal plane, the included angle being greater than 0 ° and less than 30 °.

9. The battery pack of claim 8, wherein the included angle is 1 ° to 10 °.

10. An electric tool, including battery compartment and detachably assemble in the battery package of battery compartment, characterized in that, the battery package is any one of claims 1-9 the battery package, electric tool has the air current transportation structure, set up the air current passageway of intercommunication in the battery compartment the air current transportation structure, when the battery package is assembled in the battery compartment, the lower vent of battery package with the air current passageway intercommunication.

Images