WO2022134127A1

WO2022134127A1 - Battery pack and powered device

Info

Publication number: WO2022134127A1
Application number: PCT/CN2020/139794
Authority: WO
Inventors: 汪孪祥; 李廷永; 徐卫潘; 彭芳桂
Original assignee: 东莞新能安科技有限公司
Priority date: 2020-12-27
Filing date: 2020-12-27
Publication date: 2022-06-30
Also published as: CN116420267A

Abstract

The present application relates to the technical field of new energy. Disclosed are a battery pack and a powered device. The battery pack comprises: a housing; a cell module which comprises multiple cells, wherein the multiple cells are accommodated in the housing and stacked in a first direction, the multiple cells in the cell module comprise an inner side cell set and two outer side cell sets located on two sides of the inner side cell set, and the first direction is the thickness direction of the cells; a first heat conduction module which is accommodated in the housing and connected to the inner side cell set and the housing; and two second heat conduction modules which are accommodated in the housing, wherein any one of the heat conduction modules is connected to one of the outer side cell sets and connected to the housing, and the first heat conduction module is separated from the second heat conduction modules. By means of the method, the embodiments of the present application can realize partitioned heat dissipation and heat balance of cells in a battery pack.

Description

A battery pack and electrical equipment

technical field

The present application relates to the technical field of new energy, in particular to a battery pack and electrical equipment.

Background technique

A battery pack is a device that converts external energy into electrical energy and stores it inside to power external devices when needed. Generally, a battery pack includes cells and a case for accommodating the cells. Wherein, a cell assembly as a core component usually includes a plurality of adjacently stacked and interconnected cells, and the plurality of cells can cooperate together to achieve desired power output. In order to ensure that the cell components can dissipate heat during operation to ensure the safety of the cells, some manufacturers will wrap the cells with heat-dissipating aluminum sheets, and then install thermally conductive components between the heat-dissipating aluminum sheets and the housing. The heat of the battery is conducted through the heat-dissipating aluminum sheet to the heat-dissipating component, and then transferred to the casing by the heat-conducting component, thereby achieving the effect of dissipating heat to the battery core.

However, the applicant of the present application found in the process of realizing the present application that: at present, the heat of the cells of the battery pack is conducted through the heat-dissipating aluminum sheet to the heat-conducting component, and then transferred to the casing by the heat-conducting component, and the heat transfer path is too long; In the battery pack, the outer cells on the outer side and the inner cells in the middle share the same heat dissipation channel, but the heat generation of the outer cells and the inner cells are not the same, which is easy to cause the gap between the outer cells and the inner cells. caloric imbalance.

Application content

In order to solve the problems in the prior art, the present application provides a battery pack and electrical equipment.

The present application provides a battery pack, comprising: a casing;

The battery cell assembly includes a plurality of battery cells, the plurality of battery cells are accommodated in the housing, and the plurality of battery cells are stacked along a first direction, and the plurality of battery cells in the battery cell assembly include inner battery cells. a core group, and two sets of outer cell groups located on both sides of the inner cell group, wherein the first direction is along the thickness direction of the cells;

a first heat-conducting component accommodated in the casing, the first heat-conducting component is connected to the inner cell group and the casing;

Two second heat-conducting assemblies are accommodated in the casing, any one of the heat-conducting assemblies is connected to one of the outer battery packs, and is connected to the casing; wherein, the first heat-conducting assembly and the second heat-conducting assembly phase separation.

Optionally, the housing includes a first side wall, a second side wall, a third side wall, a fourth side wall and a lower cover, the first side wall, the second side wall, the third side wall and the first side wall The four side walls are connected end to end in sequence, the lower cover is connected to the first side wall, the second side wall, the third side wall and the fourth side wall respectively, the first side wall, the second side wall, the third side wall The side wall, the fourth side wall and the lower cover enclose an accommodating cavity, and the battery core assembly, the first heat-conducting assembly and the second heat-conducting assembly are all accommodated in the accommodating cavity.

Optionally, the first heat-conducting component further includes a first heat-conducting member and a second heat-conducting member, one surface of the first heat-conducting member is adjacent to the inner surface of the first side wall, and the other The surface is adjacent to the side surface of the inner cell group; one surface of the second heat-conducting member is attached to the bottom surface of the inner cell group, and the other surface of the second heat-conducting member is attached to the inner surface of the lower cover.

Optionally, two surfaces of the second heat conducting component are respectively attached to the inner surface of the second side wall and a side of the outer cell group located in the first direction and facing the second side wall, and the other Two surfaces of the second heat-conducting component are respectively attached to the inner surface of the fourth side wall and the other side of the outer cell group located in the first direction and facing the fourth side wall.

Optionally, the battery pack further includes two first heat insulating members, one of the first heat insulating members is disposed between the bottom surface of an outer battery cell group and the lower cover of the casing.

Optionally, the heat insulating member includes foam.

Optionally, the outer surface of the casing is provided with several fins.

Optionally, the battery pack further includes two second heat insulating members, and one of the second heat insulating members is disposed between one of the outer cell packs and the inner cell pack.

Optionally, the material of the casing includes metal.

In order to solve the above technical problem, another technical solution adopted in the present application is to provide an electrical device, including the battery pack and a load according to any one of the above, where the battery pack is used for supplying power to the load.

Optionally, the electrical equipment includes an unmanned aerial vehicle or a power tool.

The present application has the following beneficial effects: a first heat-conducting component is arranged between the inner battery core and the casing, and a second heat-conducting component is arranged between the outer battery core and the casing, and the heat of the inner battery core passes through The first heat-conducting component is transmitted to the casing, and then diffused from the casing to the outside world, the outer cell is transmitted to the casing through the first heat-conducting component, and then diffused to the outside by the casing, and the first heat-conducting component constitutes the heat dissipation channel of the inner cell , the second heat-conducting component constitutes the heat-dissipating channel of the inner cell, and the first heat-conducting component and the second heat-conducting component are separated, which is equivalent to the heat-dissipating channel of the inner battery and the heat-dissipating channel of the outer battery are independent of each other. The calorific value of the core and the outer battery is different, and the heat dissipation effect of the first heat conduction component and the second heat conduction component is adjusted to keep the temperature of the inner battery and the outer battery the same, so as to achieve heat balance; in addition, the application reduces the heat dissipation aluminum sheet , so that the heat dissipation paths of the inner battery core and the outer battery core are shortened, and the first heat conduction component and the second heat conduction component are directly in contact with the housing for heat dissipation, which is beneficial to improve the heat dissipation efficiency.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute limitations of the embodiments, and elements with the same reference numerals in the drawings are denoted as similar elements, Unless otherwise stated, the figures in the accompanying drawings do not constitute a scale limitation.

1 is an overall schematic diagram of an embodiment of a battery pack of the present application;

2 is an exploded view of an embodiment of a battery pack of the present application;

3 is a schematic diagram of an explosion of an inner cell and an outer cell in an embodiment of the battery pack of the present application;

4 is a schematic view of a casing of an embodiment of a battery pack of the present application;

FIG. 5 is an exploded schematic diagram of an embodiment of the battery pack of the present application;

FIG. 6 is a partial enlarged view of A in FIG. 5 .

Detailed ways

In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element, or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field belonging to this application. The terms used in the specification of the present application in this specification are for the purpose of describing specific embodiments only, and are not intended to limit the present application. As used in this specification, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 and FIG. 2 , the battery pack 1 includes a casing 10 , a cell assembly 20 , a first heat conducting assembly 30 and a second heat conducting assembly 40 . The cell assembly 20 is disposed in the housing 10 , and the cell assembly 20 includes a plurality of cells (not shown), the first thermal conductive component 30 and the second thermal conductive component 40 are both located in the housing 10 , and the first thermal conductive component 30 The second heat conducting component 40 is used to transfer the heat of a part of the cells in the cell assembly 20 to the casing 10 , and is diffused to the outside by the casing 10 , and the second heat conducting component 40 is used to transfer the heat of another part of the cells in the cell assembly 20 to the casing 10, diffused from the shell 10 to the outside.

For the above-mentioned cell assembly 20, please refer to FIG. 3, the cell assembly 20 includes a plurality of cells, and the plurality of cells are stacked in sequence along the thickness direction of the cells, and the first direction is the direction along the thickness of the cells, Wherein, the plurality of cells can be connected in series or in parallel. The plurality of cells are divided into an inner cell group 201 and two groups of outer cell groups 202 located on both sides of the inner cell group 201 . When the cell assembly 20 is in operation, the heat generation of the inner cell group 201 and the outer cell group 202 are different, and there is likely to be a temperature difference between the two.

It should be noted that: the number of inner cell groups 201 may be one or more. The outer cell group 202 on each side may be the outermost cell on the side, and in some embodiments, when the number of cells is relatively large, the heat generation of the cells adjacent to the outer cell group 202 Usually, the calorific value of the cell on one side is the same. Therefore, the cell adjacent to the outer cell group 202 may not be included in the inner cell group 201 , and the cell can dissipate heat through the outer cell group 202 .

In order to facilitate the reader's understanding, the top surface, side surface and bottom surface of the cell are described below: the top surface of the cell refers to the surface where the tabs of the cell are located, and the bottom surface of the cell refers to the surface of the cell opposite to the top surface. One surface, the side of the cell refers to the surface between the top surface and the bottom surface, and the shape of the cell is usually a cuboid, the side of the cell usually contains four, and the side of the cell in the first direction refers to The side face perpendicular to the first direction, the side face of which the cell is located in the second direction refers to the side face perpendicular to the second direction.

For the above housing 10, as shown in FIG. 4 and FIG. 5, the housing 10 includes a first side wall 101, a second side wall 102, a third side wall 103, a fourth side wall 104, a lower cover 105 and an upper side wall 101. In the cover 106, the first side wall 101, the second side wall 102, the third side wall 103, and the fourth side wall 104 are connected end to end in sequence, and the first side wall 101, the second side wall 102, the third side The wall 103 , the fourth side wall 104 and the lower cover 105 enclose a receiving cavity 107 . The cell assembly 20 , the first heat conduction assembly 30 and the second heat conduction assembly 40 are all accommodated in the receiving cavity 107 , and the first heat conduction assembly 30 and the second heat conduction assembly 40 transfer the heat of the cell assembly 20 to the casing 10 .

In some embodiments, a plurality of fins 108 are disposed on the outer surface of the casing, and the plurality of fins 108 increase the contact area between the casing 10 and the air, thereby enhancing the heat dissipation effect of the casing 10 .

In some embodiments, the casing 10 is made of metal, such as aluminum, copper, etc., the metal has better thermal conductivity, which can greatly improve the heat dissipation effect of the casing 10 . Of course, in other embodiments, the casing 10 is not limited to be made of metal, and can also be made of other materials with good thermal conductivity.

Referring to FIG. 5 for the above-mentioned first heat-conducting component 30 , the first heat-conducting component 30 includes a first heat-conducting member 301 and a second heat-conducting member 302 , and the first heat-conducting member 301 is disposed on the inner cell group 201 at the In the second direction and facing between the side of the first side wall 101 and the first side wall 101 of the housing 10 , a surface of the first heat conducting member 301 is adjacent to the inner surface of the first side wall 101 , the The other surface of the first heat conducting member 301 is adjacent to one side surface of the inner cell group 201 . The second heat conducting member 302 is disposed between the bottom surface of the inner cell group 201 and the lower cover 105 of the housing 10 . One surface of the second heat-conducting member 302 is attached to the bottom surface of the inner cell group 201 , and the other surface of the second heat-conducting member 302 is attached to the inner surface of the lower cover. The first thermal conductive member 301 is a thermally conductive adhesive, the second thermally conductive member 302 is a thermally conductive gasket, and the thermally conductive gasket is a polymer material made of silica gel and thermally conductive ceramic fillers and processed by a special process. It is called thermal conductive silicone pad. The inner cell group 201 can quickly transfer the heat generated by the inner cell group 201 to the first side of the casing 10 through the first heat-conducting component 301 and the second heat-conducting member 302 during operation. The wall 101 and the lower cover 105 are completed to dissipate heat.

In some embodiments, the first heat-conducting component 30 may further include a third heat-conducting member 303, a surface of the third heat-conducting member 303 is adjacent to the inner surface of the third side wall 103, and the third heat-conducting member 303 The other surface of the element 303 is adjacent to the other side surface of the inner cell group 201 . It should be noted that, the third heat conducting member 303 is a heat conducting glue.

It is worth noting that the cells in the housing 10 can also be arranged in multiple rows, and the multiple rows of cells are arranged side by side, while the first heat-conducting member 301 and the third heat-conducting member 303 are arranged on the outermost two rows of the multi-row cells. on the side of the inner cell group 201.

For the above-mentioned second heat-conducting components 40 , the number of the second heat-conducting components is two, and one of the second heat-conducting components 40 and one of the outer cell groups 202 are located in the first direction and face the second side wall 102 respectively. The side surface is connected to the second side wall 102 of the housing 10 , and the two surfaces of the second heat-conducting component 40 are respectively attached to the inner surface of the second side wall 102 and the outer cell group 202 is located in the first direction and The side facing the second side wall 102 . The other second heat conducting component 40 is respectively connected with the side of the outer cell group 202 located in the first direction and facing the fourth side wall 104 and the fourth side wall 104 of the housing 10 , and the other second Two surfaces of the thermally conductive component 40 are respectively attached to the inner surface of the fourth side wall 104 and the other side of the outer cell group 202 located in the first direction and facing the fourth side wall 104 . The heat generated by the two groups of outer battery cells 202 during operation can be quickly transferred to the casing 10 through the second heat conducting component 40 , and the casing 10 dissipates heat.

In some embodiments, the second thermally conductive component 40 is a thermally conductive sheet, and the area of the second thermally conductive component 40 is larger than that of the first thermally conductive component 30 . The area of the side of the cell in the second direction and the area of the bottom of the cell are smaller than the area of the side of the cell in the first direction, and when the cell assembly 20 is in operation, the temperature of the outer cell group 202 is higher than that of all cells. The temperature of the inner cell group 201 is higher. Attach the second heat-conducting component 40 with a large area to the side of the outer cell group 202 in the first direction, and attach the first heat-conducting component 30 with a small area to the bottom surface and the inner surface of the inner battery. On the side in the second direction, the heat dissipation effect of the second heat-conducting component 40 on the outer battery cell group 202 can be better than the heat-dissipating effect on the inner battery core by the first heat-conducting component 30, so as to achieve greater heat dissipation. The temperature of the inner cell group 201 and the outer cell group 202 are kept the same, so that the inner cell group 201 and the outer cell group 202 can keep the same temperature. Thermal equalization of group 202 .

In some embodiments, the battery pack 1 further includes a first thermal insulation member 50 and a second thermal insulation member 60 .

For the above-mentioned first heat insulation members 50, the number of the first heat insulation members 50 is two, and the two first heat insulation members 50 are respectively disposed at the bottoms of the two outer cell groups 202. The outer cell group 202 is in contact with the lower cover 105 through the heat insulating member 40 . The two first heat shields 50 separate the two outer cell groups 202 from the lower cover 105 , and prevent the heat generated by the outer cell groups 202 from being transferred to the lower cover 105 during operation. The heat of the cover 105 or the lower cover 105 will not be transferred to the outer cell group 202 to cause heat dissipation disorder.

For the second heat insulating member 60, the number of the second heat insulating member 60 is two, and the second heat insulating member 60 is disposed between the outer cell group 202 and the inner cell group 201, One of the second heat insulating members 60 is disposed between the other outer cell group 202 and the inner cell group 201 . The two second heat insulating members 60 separate the inner cell group 201 and the two outer cell groups 202, so that the outer cell group 202 and the inner cell group 201 are in operation. The heat generated is not transferred to each other.

In some embodiments, both the first thermal insulation member 50 and the second thermal insulation member 60 are made of foam.

In the embodiment of the present application, a first heat conduction assembly 30 is disposed between the inner cell group 201 and the casing 10 , and a second heat conduction assembly 40 is disposed between the outer electric cell group 202 and the casing 10 . , the heat of the inner cell group 201 is transmitted to the casing 10 through the first heat conducting component 30, and then diffused to the outside by the casing 10, and the outer electric core group 202 is transmitted to the casing 10 through the first heat conducting component 30, and then transmitted by the casing 10. 10 is diffused to the outside world, and the first heat-conducting component 30 constitutes the heat dissipation channel of the inner battery pack 201, the second heat-conducting component 40 constitutes the heat dissipation channel of the outer battery pack 202, and the first heat-conducting component 30 and the second heat-conducting component 40 are separated from each other. Equivalently, the heat dissipation channel of the inner cell group 201 and the heat dissipation channel of the outer cell group 202 are independent of each other. Therefore, the first heat conduction assembly 30 can be adjusted according to the difference in heat generation between the inner cell group 201 and the outer cell group 202 . and the heat dissipation effect of the second heat conduction assembly 40, so that the temperature of the inner cell group 201 and the outer cell group 202 are kept the same to achieve thermal balance; The heat dissipation path of the group 202 is shortened, and the first heat conduction assembly 30 and the second heat conduction assembly 40 are in direct contact with the housing 10 for heat dissipation, which is beneficial to improve the heat dissipation efficiency.

The present application also provides an embodiment of an electrical device, and the electrical device includes the battery pack 1 described in any of the above embodiments. For the structure and function of the battery pack 1, please refer to the above-mentioned embodiments, which will not be described here. Repeat. In some embodiments, the powered device may be a drone or a power tool.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; under the thinking of the present application, the technical features in the above embodiments or different embodiments can also be combined, The steps may be carried out in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been The skilled person should understand that it is still possible to modify the technical solutions recorded in the foregoing embodiments, or to perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the implementation of the application. scope of technical solutions.

Claims

A battery pack, comprising:

case;

The battery cell assembly includes a plurality of battery cells, the plurality of battery cells are accommodated in the housing, and the plurality of battery cells are stacked along a first direction, and the plurality of battery cells in the battery cell assembly include inner battery cells. a core group, and two sets of outer cell groups located on both sides of the inner cell group, wherein the first direction is along the thickness direction of the cells;

a first heat-conducting component accommodated in the casing, the first heat-conducting component is connected to the inner cell group and the casing;

Two second heat-conducting assemblies are accommodated in the casing, any one of the heat-conducting assemblies is connected to one of the outer battery packs, and is connected to the casing; wherein, the first heat-conducting assembly and the second heat-conducting assembly phase separation.
The battery pack according to claim 1, wherein the housing comprises a first side wall, a second side wall, a third side wall, a fourth side wall and a lower cover, the first side wall, the first side wall The second side wall, the third side wall and the fourth side wall are connected end to end in sequence, the lower cover is connected with the first side wall, the second side wall, the third side wall and the fourth side wall respectively, the first side wall The side wall, the second side wall, the third side wall, the fourth side wall and the lower cover enclose a receiving cavity, and the cell components, the first heat conducting component and the second heat conducting component are all contained in the receiving cavity.
The battery pack according to claim 1 or 2, wherein the first heat-conducting component further comprises a first heat-conducting member and a second heat-conducting member, and a surface of the first heat-conducting member is connected to an inner surface of the first side wall. The surfaces are adjacent, and the other surface of the first heat-conducting member is adjacent to the side surface of the inner cell group;

One surface of the second heat-conducting member is attached to the bottom surface of the inner cell group, and the other surface of the second heat-conducting member is attached to the inner surface of the lower cover.
The battery pack according to claim 3, wherein two surfaces of the second heat-conducting component are respectively attached to the inner surface of the second side wall, and the outer cell group is located in the first direction and faces the second side wall. On the side surfaces of the two side walls, the two surfaces of the other second thermally conductive component are respectively attached to the inner surface of the fourth side wall and the other outer cell group is located in the first direction and faces the fourth side wall. side.
The battery pack according to claim 4, further comprising two first heat insulating parts, one of the first heat insulating parts is disposed between the bottom surface of an outer battery pack and the lower cover of the casing between.
The battery pack of claim 5, wherein the heat insulating member comprises foam.
The battery pack according to any one of claims 6, wherein the outer surface of the casing is provided with a plurality of ribs.
The battery pack according to any one of claims 7, further comprising two second heat insulating members, one of the second heat insulating members is disposed on one of the outer battery pack and the inner battery pack between.
The battery pack according to claim 8, wherein the material of the casing comprises metal.
An electrical device, characterized in that it comprises the battery pack according to any one of claims 1-9 and a load, wherein the battery pack is used to supply power to the load.
Electrical equipment according to 10, including drones, or power tools.