CN217903224U

CN217903224U - Battery pack

Info

Publication number: CN217903224U
Application number: CN202221674149.4U
Authority: CN
Inventors: 黄星星
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-11-25
Anticipated expiration: 2032-06-30

Abstract

A battery pack comprises a battery pack shell and an energy storage component arranged in the battery pack shell, and further comprises: a first heat conducting member in heat conducting connection with the energy storage component; the second heat conduction component is respectively connected with the first heat conduction component and the battery pack shell in a heat conduction way; the energy storage component, the first heat-conducting component, the second heat-conducting component and the battery pack shell are sequentially attached to form a heat dissipation path, and the heat dissipation path is used for guiding out the heat of the energy storage component. The utility model discloses a battery package has better heat dispersion.

Description

Battery pack

[ technical field ]

The utility model relates to a battery package especially relates to a battery package for electric tool.

[ background art ]

Cordless power tools and other wireless devices use rechargeable battery packs as a power source. These battery packs are typically removably connected to other tools or devices. The battery pack may be repeatedly charged and discharged to allow the user to reuse the tool without purchasing a new power source.

However, with the continuous development of the battery pack technology, the discharging current and the charging current of the battery pack are also gradually increased, and during the use process, the heat generated by the positive and negative terminal pole pieces of the battery pack, the circuit board, the lead-out piece connected with the battery cell unit, and other components through which the current flows, is also increased, especially when the electric tool continuously operates for a period of time with a large current, the temperature of these components will rise sharply, which brings the problems of the safety and the reliability of the battery pack.

In order to solve the above problems, the conventional battery pack mainly dissipates heat by opening a heat dissipating port on a housing of the battery pack, and although this way can dissipate part of heat in the battery pack, the heat dissipating effect is not good.

Accordingly, there is a need for an improved battery pack that overcomes the deficiencies of the prior art.

[ contents of utility model ]

To the not enough of prior art, the utility model aims to provide a battery package with good heat dispersion.

The utility model provides a technical scheme that prior art problem adopted is: a battery pack comprises a battery pack shell and an energy storage component arranged in the battery pack shell, and further comprises: a first heat conducting member in heat conducting connection with the energy storage component; the second heat conduction component is respectively connected with the first heat conduction component and the battery pack shell in a heat conduction way; the energy storage component, the first heat conducting member, the second heat conducting member and the battery pack shell are sequentially attached to form a heat dissipation path, and the heat dissipation path is used for guiding out heat of the energy storage component.

The further improvement scheme is as follows: the energy storage component comprises an electric core component and an electric core connecting sheet arranged at the end part of the electric core component; the first heat conducting component is at least in heat conducting connection with the cell connecting sheet.

The further improvement scheme is as follows: the second heat conductive member at least partially protrudes to the outside of the battery pack case.

The further improvement scheme is as follows: the second heat conduction member comprises a base and a heat dissipation part arranged on the base, the base is in heat conduction connection with the first heat conduction member, and the heat dissipation part extends out of the battery pack shell; the battery pack shell is provided with an opening for the heat dissipation part to extend out.

The further improvement scheme is as follows: the outer surface of the heat dissipation part and the outer surface of the battery pack shell are positioned on the same plane.

The further improvement scheme is as follows: the first heat conducting component is an elastic insulating heat conducting sheet.

The further improvement scheme is as follows: the first heat conducting member is in interference fit with the energy storage component and the second heat conducting member.

The further improvement scheme is as follows: the second heat conducting component is a metal heat conducting sheet.

The further improvement scheme is as follows: the battery pack shell is provided with a heat dissipation port.

The further improvement scheme is as follows: the heat dissipation opening is arranged at the bottom of the battery pack shell.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model provides a battery package is through connecting the heat dissipation route of forming the heat derivation of energy storage part with energy storage part, first heat conduction component, second heat conduction component and battery package shell heat conduction in proper order for the battery package can dispel the heat better.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present invention;

fig. 2 is another structural schematic view of the battery pack provided in fig. 1;

fig. 3 is a schematic diagram of the structure of an energy storage component in the battery pack provided in fig. 1;

fig. 4 is an exploded view of the first heat transfer member and the energy storage component of the battery pack provided in fig. 1;

fig. 5 is an exploded view of the battery pack provided in fig. 1.

The meaning of the reference symbols in the figures:

100. a battery pack; 110. a battery pack housing; 111. an upper cover; 112. a lower cover; 113. a bolt; 114. a hole; 115. connecting columns; 116. a heat dissipation port; 117. an opening; 120. an energy storage component; 121. an electrical core assembly; 122. connecting the battery cell; 123. a support; 124. an electric core; 125. a compression member; 130. a first heat conductive member; 140. a second heat-conducting member; 141. a base; 142. a heat dissipating portion.

[ detailed description of the invention ]

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 and 2, an embodiment of the present invention provides a battery pack 100, and more particularly, provides a battery pack 100 for an electric tool, and further, the battery pack 100 can be used in other wireless devices.

Referring to fig. 1 and fig. 2, in the present embodiment, the battery pack 100 includes a battery pack case 110 and an energy storage component 120 disposed in the battery pack case 110, the battery pack case 110 includes an upper cover 111 and a lower cover 112, the upper cover 111 and the lower cover 112 are installed to form the battery pack case 110, and a cavity capable of accommodating the energy storage component 120 is formed in the battery pack case 110. In this embodiment, the upper cover 111 and the lower cover 112 are fixed by a bolt 113, for example, the bolt 113 may be fastened to the upper cover 111 after passing through the lower cover 112, a hole 114 for passing the bolt 113 is provided on the lower cover 112, a connection column 115 for fastening and connecting with the bolt 113 is provided on the upper cover 111, and a screw hole matched with the bolt 113 is provided on the connection column 115. In order to ensure the fixing firmness of the upper cover 111 and the lower cover 112, the bolts 113 may be distributed in a matrix on the battery pack case 110.

The bottom of the battery pack case 110 is provided with a heat radiation port 116, and the heat generated by the energy storage member 120 in the battery pack 100 can be partially dissipated by providing the heat radiation port 116. The heat dissipation holes 116 may be partially spaced apart from the edge of the bottom of the battery pack case 110 and partially disposed on the lower surface of the battery pack case 110.

Referring to fig. 3, the energy storage component 120 of the battery pack 100 includes a cell assembly 121 and a cell connecting piece 122 disposed at an end of the cell assembly 121. The battery assembly 121 includes a support 123 and a plurality of battery cells 124 fixed by the support 123, the support 123 adopts a partially hollow structure so that the positive electrode and the negative electrode of the battery cells 124 can be exposed from the support 123, a battery cell 124 connecting piece 122 is disposed on the support 123 and electrically connected to the positive electrode or the negative electrode of the battery cells 124, and the battery cells 124 form a series connection or a parallel connection through the battery cell 124 connecting piece 122. Battery cell 124 assembly 121 further includes a pressing member 125 disposed below battery cell 124, and the pressing member is pressed on the outer side of battery cell 124, and is used to apply an acting force for clamping battery cell 124 to bracket 123.

During the discharging process of the battery pack 100, there is a situation that heat is generated only at a place where a current flows, and the most important heat generation sources are the battery core 124 and the battery core connecting sheet 122. In order to effectively derive the heat from the battery cell 124 and the battery cell connecting sheet 122, the present invention improves the heat dissipation structure of the battery pack 100.

Referring to fig. 4, a first heat conducting member 130 thermally connected to the cell connecting sheet 122 is disposed at an end of the energy storage component 120. In the present embodiment, the first heat conducting members 130 are disposed at both side ends of the energy storage component 120, and the heat generated by the energy storage component 120 is conducted out from both side ends of the energy storage component 120 through the first heat conducting members 130. In other embodiments, the first heat conducting member 130 may be disposed only at one side end of the energy storage component 120, and the heat generated by the energy storage component 120 is conducted out from one side end of the energy storage component 120 through the first heat conducting member 130, although the heat conducting effect of the single-side heat conducting structure in this embodiment is not good as that of the double-side heat conducting structure, compared with a method of only relying on the heat dissipation port 116 on the battery pack case 110 to dissipate heat, the heat dissipation performance of the battery pack 100 can still be effectively improved.

In the present embodiment, the first heat conducting member 130 and the cell connecting sheet 122 at the corresponding side end portion thereof each constitute a heat conducting connection that mainly conducts out heat concentrated on the cell connecting sheet 122, and preferably, the area of the first heat conducting member 130 is not smaller than the sum of the areas of the cell connecting sheets 122 at the corresponding side end portion thereof, that is, the first heat conducting member 130 can at least entirely cover the cell connecting sheet 122 at the corresponding side end portion thereof. In other embodiments, the first heat conducting member 130 may also extend to the periphery of the energy storage component 120, that is, in this embodiment, the first heat conducting member 130 covers not only the corresponding side end portion thereof, but also the periphery of the energy storage component 120, and at this time, the first heat conducting member 130 is disposed in a sleeve-like structure to cover the corresponding side end portion thereof, in this way, the first heat conducting member 130 is not only in heat conduction connection with the corresponding side cell connecting piece 122, but also in heat conduction connection with a part of the bracket 123, even a part of the cell 124, so as to further favorably conduct heat out of the energy storage component 120.

In the embodiment, the first heat conducting member 130 is an elastic insulating heat conducting sheet, for example, the first heat conducting member 130 may be a heat conducting silicone sheet, the heat conducting silicone sheet generally has a heat conducting coefficient of 1.0-3.0w/m.k, and the heat conducting coefficient of air is generally 0.0244w/m.k, and obviously, compared with a mode that the heat of the energy storage component 120 is conducted out from the heat dissipating port 116 only through air, a mode that the heat of the energy storage component 120 is conducted out by using the heat conducting silicone sheet as the first heat conducting member 130 has a better heat dissipating performance.

Referring to fig. 5, a second heat-conducting member 140 is disposed between the first heat-conducting member 130 and the battery pack case 110, and the second heat-conducting member 140 is respectively connected to the first heat-conducting member 130 and the battery pack case 110 in a heat-conducting manner. In this embodiment, the second heat conducting members 140 are disposed at both ends of the energy storage component 120, and the second heat conducting members 140, the first heat conducting members 130 and the battery pack case 110 are attached to form a heat dissipation path for guiding out heat of the energy storage component 120. In other embodiments, corresponding to the above-mentioned situation where the first heat conducting member 130 is disposed only at one side end of the energy storage component 120, in this embodiment, the second heat conducting member 140 may be disposed only at one side where the first heat conducting member 130 is disposed, that is, a heat dissipation path for conducting heat away from the energy storage component 120 is formed only at one side of the energy storage component 120, although the heat conduction effect of the single-side heat conducting structure in this embodiment is not as good as that of the double-side heat conducting structure, the heat dissipation performance of the battery pack 100 can still be effectively improved compared to a mode of dissipating heat only by means of the heat dissipation opening 116 on the battery pack case 110.

In the present embodiment, the second heat conductive member 140 protrudes at least partially to the outside of the battery pack case 110. For example, the second heat conductive member 140 includes a base 141 and a heat dissipation part 142 disposed on the base 141, the base 141 is thermally connected to the first heat conductive member 130, and the heat dissipation part 142 protrudes to the outside of the battery pack case 110; the battery pack case 110 is provided with an opening 117 through which the heat dissipation part 142 extends. In the present embodiment, the base 141 may have a rectangular sheet structure, the heat dissipation part 142 may have a rectangular step structure formed on the base 141, and the base 141 and the heat dissipation part 142 may be configured by being integrally molded. Correspondingly, the opening 117 of the battery pack case 110 may be a rectangular opening 117 through which the heat dissipation part 142 protrudes. In order to ensure the flatness of the outer surface of the pack case 110 and prevent the heat dissipation member 142 protruding to the pack case 110 from scratching an operator, the outer surface of the heat dissipation member 142 may be disposed not to exceed the outer surface of the pack case 110, and preferably, the outer surface of the heat dissipation member 142 is located on the same plane as the outer surface of the pack case 110.

In other embodiments, the second heat conductive member 140 may be disposed on an inner surface of the battery pack case 110 to transfer heat to the battery pack case 110, and dissipate heat using the battery pack case 110, in which the second heat conductive member 140 is defined inside the battery pack case 110, and no portion of the second heat conductive member 140 protrudes out of the battery pack case 110. Furthermore, a grid-shaped heat dissipation opening 116 may be further disposed on the battery pack case 110 at a position corresponding to the second heat conduction member 140, which is favorable for directly guiding out a part of heat on the second heat conduction member 140, and improves the heat dissipation performance of the battery pack 100 in this embodiment.

In the embodiment, the second heat conducting member 140 is a metal heat conducting sheet, for example, the second heat conducting member 140 may be an aluminum sheet, the thermal conductivity of the aluminum sheet is generally 217.7w/m.k, and the thermal conductivity of the air is generally 0.0244w/m.k, and obviously, the manner of using the aluminum sheet as the second heat conducting member 140 to conduct the heat of the first heat conducting member 130 has better heat dissipation performance than the manner of conducting the heat of the energy storage component 120 from the heat dissipation port 116 only through the air.

The utility model discloses a first heat conduction component 130 adopts and has elastic insulating conducting strip, utilizes the elasticity of first heat conduction component 130 for there is not air gap between energy storage component 120, first heat conduction component 130, second heat conduction component 140 and the battery package shell 110, compare in only adopting and relying on the air to derive the thermovent 116 on the heat follow battery package shell 110 and carry out radiating mode, greatly improved heat-conduction efficiency, effectively reduce the battery package temperature rise.

The term "thermally conductive connection" as used herein refers to a connection that allows one component to contact another component and to transfer heat.

The present invention is not limited to the above-described embodiments. One of ordinary skill in the art will readily recognize that there are numerous alternatives to the battery pack 100 of the present invention without departing from the principles and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. The utility model provides a battery pack, includes battery pack shell and sets up the energy storage part in battery pack shell, its characterized in that: further comprising:

a first heat conducting member in heat conducting connection with the energy storage component;

the second heat conduction component is respectively connected with the first heat conduction component and the battery pack shell in a heat conduction way;

the energy storage component, the first heat-conducting component, the second heat-conducting component and the battery pack shell are sequentially attached to form a heat dissipation path, and the heat dissipation path is used for guiding out the heat of the energy storage component.

2. The battery pack according to claim 1, wherein: the energy storage component comprises an electric core component and an electric core connecting sheet arranged at the end part of the electric core component;

the first heat conducting component is at least in heat conducting connection with the cell connecting sheet.

3. The battery pack according to claim 1, wherein: the second heat conductive member at least partially protrudes to the outside of the battery pack case.

4. The battery pack according to claim 3, wherein: the second heat conduction member comprises a base and a heat dissipation part arranged on the base, the base is in heat conduction connection with the first heat conduction member, and the heat dissipation part extends out of the outer shell of the battery pack;

an opening for the heat dissipation part to extend out is formed in the battery pack shell.

5. The battery pack according to claim 4, wherein: the outer surface of the heat dissipation part and the outer surface of the battery pack shell are positioned on the same plane.

6. The battery pack according to claim 1, wherein: the first heat conducting component is an elastic insulating heat conducting sheet.

7. The battery pack according to claim 6, wherein: the first heat conducting member is in interference fit with the energy storage component and the second heat conducting member.

8. The battery pack according to claim 1, wherein: the second heat conducting component is a metal heat conducting sheet.

9. The battery pack according to claim 1, wherein: the battery pack shell is provided with a heat dissipation opening.

10. The battery pack according to claim 9, wherein: the heat dissipation opening is arranged at the bottom of the battery pack shell.