CN113097639A

CN113097639A - Battery pack

Info

Publication number: CN113097639A
Application number: CN202110355013.0A
Authority: CN
Inventors: 吴佳凡; 杜健炜; 张志国
Original assignee: Zhuhai Cosmx Power Battery Co Ltd
Current assignee: Zhuhai Cosmx Power Battery Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-07-09

Abstract

The invention provides a battery pack which comprises a shell and N battery cores, wherein a first ventilation opening and a second ventilation opening are formed in the shell, and a heat dissipation air duct is formed between the first ventilation opening and the second ventilation opening; the N battery cells are arranged in the shell, gaps among the N battery cells form at least part of the heat dissipation air duct, and battery cell tabs of the N battery cells are all positioned in the heat dissipation air duct; n is an integer greater than 1. The embodiment of the invention can improve the heat dissipation performance of the battery pack.

Description

Battery pack

Technical Field

The invention relates to the technical field of batteries, in particular to a battery pack.

Background

The battery pack is usually a pack (pack) formed by combining a plurality of battery cells and a battery management system circuit, and heat dissipation of the battery pack is always important in the design process, so that a great deal of effort is made for researchers.

In the prior art, because the characteristics that battery package electricity core piles up and the restriction in space, the heat dissipation to the battery package has been more limited to the scheme ever before, uses the heat dissipation aluminum sheet directly to the outside with the heat-conduction of electricity core body usually. When the battery works at a large multiplying power, the battery core lug cannot be sufficiently radiated. Therefore, the heat dissipation performance of the conventional battery pack is poor.

Disclosure of Invention

The embodiment of the invention provides a battery pack, which aims to solve the problem that the existing battery pack is poor in heat dissipation performance.

The embodiment of the invention provides a battery pack which is characterized by comprising a shell and N battery cores, wherein a first ventilation opening and a second ventilation opening are formed in the shell, and a heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening;

the N battery cells are arranged in the shell, gaps among the N battery cells form at least part of the heat dissipation air duct, and battery cell tabs of the N battery cells are all positioned in the heat dissipation air duct; n is an integer greater than 1.

Optionally, the heat dissipation air duct includes a first air duct and a second air duct, one end of the first air duct is communicated with the first vent, and one end of the second air duct is communicated with the second vent; the battery core tab of the battery core is positioned in the first air duct.

Optionally, the first air duct and the second air duct are arranged vertically, and one end of the first air duct, which is far away from the first vent, is connected with the second air duct.

Optionally, the first ventilation opening is disposed at the bottom or the top of the housing, and the first air duct extends from the bottom of the housing to the top of the housing.

Optionally, the battery pack further includes at least one heat dissipation plate, and each heat dissipation plate is located in a gap between two oppositely disposed battery cells and is attached and fixed to the two oppositely disposed battery cells respectively.

Optionally, the battery pack further includes a battery management system circuit and a cooling plate, the battery management system circuit is electrically connected to the N battery cells, the cooling plate is respectively fixedly connected to the battery management system circuit and the housing, and at least a portion of the second air duct is formed by a gap between the cooling plate and the N battery cells.

Optionally, the housing includes a lower housing and an end cover, and the battery management system circuit is located between the end cover and the cooling plate, and is respectively attached and fixed to the end cover and the cooling plate.

Optionally, the first ventilation opening is arranged at the bottom or the top of the lower shell, and/or the second ventilation opening is arranged at one side of the lower shell and is positioned near the connection position of the cooling plate and the lower shell.

Optionally, a filter element is arranged at the first vent, and the filter element is detachably connected with the shell; and a sealing element is arranged at the second ventilation opening and detachably connected with the shell.

Optionally, the battery pack comprises at least one battery cell module, the battery cell module comprises a battery cell support and M battery cells, and the M battery cells are arranged in a pairwise opposite manner and are all fixedly connected with the battery cell support; m is an even number less than or equal to N.

According to the embodiment of the invention, the first ventilation opening and the second ventilation opening are arranged, the heat dissipation air channel is formed between the first ventilation opening and the second ventilation opening, at least part of the heat dissipation air channel is formed by the gaps among the N electric cores in the battery pack, and the electric core lugs of the N electric cores are all positioned in the heat dissipation air channel, so that the heat dissipation of the electric cores and the electric core lugs can be simultaneously realized through the heat dissipation air channel formed by the gaps among the N electric cores, and the heat dissipation performance of the battery pack is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

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

FIG. 2 is a second schematic view of a battery pack according to an embodiment of the present invention

Fig. 3 is a schematic structural diagram of a battery cell module in a battery pack according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The features of the terms first and second in the description and in the claims of the invention may explicitly or implicitly include one or more of these features. In the description of the present invention, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to fig. 3, an embodiment of the present invention provides a battery pack, including a casing 100 and N battery cells 402, where the casing 100 is provided with a first ventilation opening 101 and a second ventilation opening 102, and a heat dissipation air duct is formed between the first ventilation opening 101 and the second ventilation opening 102;

the N battery cells 402 are disposed in the casing 100, gaps between the N battery cells 402 form at least part of the heat dissipation air duct, and the battery tabs 4021 of the N battery cells 402 are all located in the heat dissipation air duct; n is an integer greater than 1.

In an embodiment of the present invention, the N battery cells 402 may be directly disposed inside the casing 100, or a plurality of battery cell modules may be formed by a plurality of battery cell supports, and the plurality of battery cell modules are disposed inside the casing 100, which is not limited herein. Specifically, the number of N may be specifically set according to the space of the housing 100 and a required charging voltage and charging current, and is not further limited herein.

It should be noted that, the N battery cells 402 may be arranged in pairs, and a gap between the two battery cells 402 arranged in pairs forms at least a part of a heat dissipation air duct, and when N is greater than 2, if the two battery cells 402 arranged in pairs are regarded as a battery cell combination, the battery cell combination may be stacked, so as to reduce the space occupation of the battery cells 402, which may specifically refer to fig. 1.

In order to realize the heat dissipation function of the battery pack, the battery pack may be provided with a first ventilation opening 101 and a second ventilation opening 102, and a heat dissipation air duct is formed between the first ventilation opening 101 and the second ventilation opening 102. It should be understood that the heat dissipation duct may be formed by enclosing the outer contours of the casing 100 and the N battery cells 402, so that an additional ventilation channel is not required to occupy the space of the battery pack. In the process of charging the battery, the first ventilation opening 101 may be externally connected with a fan, and cooling air is transmitted from the first ventilation opening 101 to the second ventilation opening 102 through the heat dissipation air duct, so that heat dissipation of each battery cell 402 in the battery pack can be accelerated.

For N battery cells 402, in order to implement heat dissipation of the battery cell tabs 4021, two battery cells 402 of the N battery cells 402 may be disposed opposite to each other, and the opposite sides of the battery cells 402 are both provided with the battery cell tabs 4021, so that an interval between two oppositely disposed battery cells 402 may form at least part of the above heat dissipation air duct, and at the same time, the heat dissipation is performed for the battery cell tabs 4021 of the two battery cells 402.

In the embodiment of the invention, the first ventilation opening 101 and the second ventilation opening 102 are arranged, the heat dissipation air duct is formed between the first ventilation opening 101 and the second ventilation opening 102, at least part of the heat dissipation air duct is formed by the gaps among the N electric cores 402 in the battery pack, and the electric core tabs 4021 of the N electric cores 402 are all positioned in the heat dissipation air duct, so that the heat dissipation of the electric cores 402 and the electric core tabs 4021 can be realized through the heat dissipation air duct formed by the gaps among the N electric cores 402, and the heat dissipation performance of the battery pack is improved.

Optionally, the heat dissipation air duct may include a first air duct and a second air duct, one end of the first air duct is communicated with the first ventilation opening 101, and one end of the second air duct is communicated with the second ventilation opening 102; the cell tab 4021 of the cell 402 is located in the first air duct.

In the embodiment of the present invention, since the housing 100 is generally provided in a rectangular parallelepiped shape, the vent is generally required to be provided on a side surface or a bottom surface of the housing 100 in consideration of sealing property, waterproof property, and the like. Suitably, the heat dissipation duct may include a first duct and a second duct, so as to communicate the first air vent 101 and the second air vent 102.

Meanwhile, the N electric cells 402 may be arranged in pairs, a gap between every two electric cells 402 arranged in pairs forms at least part of the first air channel, and the electric cell tabs 4021 are arranged on opposite sides of every two electric cells 402 arranged in pairs, so that the electric cell tabs 4021 are located in the first air channel.

Further, referring to fig. 2, the first air duct is an air duct vertically arranged in fig. 2, the second air duct is an air duct horizontally arranged in fig. 2, the first air duct and the second air duct can be adapted to the arrangement of the N electrical cores 402 and are arranged perpendicular to each other, and one end of the first air duct, which is far away from the first ventilation opening 101, can be communicated with the second air duct, so that a heat dissipation air duct arranged in a T shape is formed, and the space utilization rate of the battery pack is improved.

Further, the first ventilation opening 101 may be disposed at the bottom or the top of the housing 100, and the first air duct may extend from the bottom of the housing 100 to the top of the housing 100.

In the embodiment of the present invention, the first air duct is disposed between the bottom and the top of the casing 100, so that the gap between the battery cells 402 can be fully utilized to dissipate heat of the tabs, and the space utilization efficiency of the battery pack is improved

Optionally, in order to facilitate heat dissipation of the battery cell body, the battery pack further includes at least one heat dissipation plate, and each heat dissipation plate is located in a gap between two oppositely disposed battery cells 402 and is attached and fixed to the two oppositely disposed battery cells 402. In other words, the heat dissipation plate 300 may be attached and fixed to the two cells 402 disposed opposite to each other, and may shield at least a portion of the gap.

The heat of the two oppositely arranged battery cells 402 can be conducted through one heat dissipation plate 300 at the same time, and then can be cooled by cooling air of the heat dissipation air duct. The material of the heat dissipation plate 300 may be set according to actual needs. In some embodiments, the heat dissipation plate 300 may be made of an insulating material having a good thermal conductivity. In some embodiments, the heat dissipation plate 300 may be made of a conductive material such as graphite or metal through a surface insulation process.

Optionally, the Battery pack may further include a Battery Management System (BMS) circuit 200 and a cooling plate 500, the Battery Management System circuit 200 is electrically connected to the N Battery cells 402, the cooling plate 500 is fixedly connected to the Battery Management System circuit 200 and the casing 100, respectively, and a gap between the cooling plate 500 and the N Battery cells 402 forms at least part of the second air duct.

In the embodiment of the present invention, the BMS circuit 200 may intelligently manage and maintain the N battery cells 402, prevent overcharge and overdischarge of the battery, prolong the service life of the battery, and monitor the state of the battery. Generally, the BMS Circuit 200 may be mounted on a Printed Circuit Board (PCB) and fixedly coupled to the housing 100 by bonding, clamping, or the like.

In order to realize the heat dissipation of the BMS circuit 200, the BMS circuit 200 may be fixedly connected to the cooling plate 500, and specifically, the BMS circuit 200 may be disposed at one side of a PCB, and the other side of the PCB is fixedly attached to the cooling plate 500, so that the heat of the PCB is transferred to the cooling plate 500 to realize the heat dissipation of the BMS circuit 200.

Further, the cooling plate 500 and the N battery cells 402 may form at least a portion of the second air duct, so that cooling of the cooling plate 500 may be accelerated by cooling air in the heat dissipation air duct. Referring to fig. 2, a gap is formed between the cooling plate 500 and each of the N battery cells 402, so that at least a part of a second air duct is formed by the gap, and cooling air may pass through the gap to dissipate heat of the cooling plate 500.

The connection between the cooling plate 500 and the BMS circuit 200 may be set according to actual needs. In some embodiments, the cooling plate 500 may be made of an insulating material so as to be directly attached to the circuit board carrying the BMS circuit 200. In some embodiments, the cooling plate 500 may also be made of a metal material, so that the cooling plate 500 and the BMS circuit 200 may be bonded by an insulating layer provided therebetween, which is not further limited herein.

Optionally, the housing 100 includes a lower housing 103 and an end cap 104, and the battery management system circuit 200 is located between the end cap 104 and the cooling plate 500, and is respectively attached and fixed to the end cap 104 and the cooling plate 500.

In an embodiment of the present invention, the housing 100 may be composed of a lower housing 103 and an end cap 104 for easy detachment, and referring to fig. 1, the BMS circuit 200 may be mounted on a PCB and attached and fixed to the end cap 104 and the cooling plate 500 through the PCB, respectively. Of course, in other alternative embodiments, the housing 100 may be formed by a side plate and two end covers, and the like, and may be specifically configured according to actual needs.

Further, in order to ensure the sealing performance of the battery pack and prevent external solid or liquid from entering the battery pack, thereby improving the safety of the battery pack, the connection between the cooling plate 500 and the battery management system circuit 200 may be sealed, and the connection between the cooling plate 500 and the lower case 103 may be sealed.

Specifically, the sealing process may be performed by providing a sealing ring on the cooling plate 500, or by connecting the cooling plate 500 and the housing 100 by using a sealant, and the like, and is not limited thereto.

Optionally, the first ventilation opening 101 is disposed at the bottom or the top of the housing 100, and/or the second ventilation opening 102 is disposed at one side of the housing 100 and is located near the connection point of the cooling plate 500 and the housing 100.

In an embodiment of the present invention, the first ventilation opening 101 may be disposed at the bottom or the top of the housing 100 in order to fully utilize the space inside the battery pack. The second ventilation opening 102 may be provided near a connection point of the cooling plate 500 and the case 100 so that cooling air may pass through the cooling plate 500 provided at the end cover 104. In practical applications, the first ventilation opening 101 may be an air inlet connected to a fan, and the second ventilation opening 102 may be an air outlet.

Referring to fig. 2, the arrow in fig. 2 indicates a possible flow direction of the cooling air, and the cooling air enters from the first ventilation opening 101, passes through a partial heat dissipation air duct formed by the gaps between the N battery cells 402, then passes through a partial heat dissipation air duct formed by the cooling plate 500 and the N battery cells 402, and finally flows out from the second ventilation opening 102.

Optionally, a filter 105 may be disposed at the first ventilation opening 101, and the filter 105 is detachably connected to the housing 100; a sealing member 106 may be disposed at the second ventilation opening 102, and the sealing member 106 is detachably connected to the housing 100.

As can be seen from the above, the first ventilation opening 101 may serve as an air inlet of the battery pack, and the second ventilation opening 102 may serve as an air outlet of the battery pack. In an embodiment of the present invention, in order to keep the cooling air clean and dry, a filter 105 may be disposed at the first ventilation opening 101, and the filter 105 may be a filter cotton or a filter net to block external dust and moisture.

Meanwhile, in order to ensure the sealing performance of the battery pack and avoid safety problems caused by external solids or liquid entering the battery pack, a sealing member 106, such as a shielding object made of rubber, may be disposed at the second air vent 102, and may be specifically set according to actual needs.

Optionally, the battery pack may include at least one battery cell module 400, where the battery cell module 400 includes a battery cell support 401 and M battery cells 402, and the M battery cells 402 are arranged opposite to each other in pairs and are all fixedly connected to the battery cell support 401; m is an even number less than or equal to N.

In an embodiment of the present invention, the N battery cells 402 may form at least one battery cell module 400, and each battery cell module 400 may include M battery cells 402, where the M battery cells 402 are arranged in pairs and are fixed in the casing 100 through the battery cell supports 401. Further, the battery cell module 400 is a plurality of circumstances, and is a plurality of the battery cell module 400 can range upon range of the setting to reduce the space occupation of battery cell module 400.

Specifically, referring to fig. 3, in the embodiment of the present invention, in order to improve the space utilization rate of the battery pack, the battery cell module 400 may be provided with two battery cells 402 on two sides of a battery cell support 401, that is, the 4 battery cells 402 are symmetrically distributed about the battery cell support 401. For every two oppositely arranged battery cells 402, the battery cells can be fixedly attached to one heat dissipation plate 300, so that heat can be conducted to the two battery cells 402 through one heat dissipation plate 300, and cost is reduced. Meanwhile, in order to accelerate heat dissipation, the heat dissipation plate 300 may be partially disposed in a gap between two opposite battery cells 402, and is attached and fixed to the two opposite battery cells 402. In other words, the heat dissipation plate 300 may be attached and fixed to the two cells 402 disposed opposite to each other, and may shield at least a portion of the gap.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack is characterized by comprising a shell and N battery cores, wherein a first ventilation opening and a second ventilation opening are formed in the shell, and a heat dissipation air duct is formed between the first ventilation opening and the second ventilation opening;

2. The battery pack according to claim 1, wherein the heat dissipation air duct includes a first air duct and a second air duct, one end of the first air duct communicates with the first vent, and one end of the second air duct communicates with the second vent; the battery core tab of the battery core is positioned in the first air duct.

3. The battery pack according to claim 2, wherein the first air duct is perpendicular to the second air duct, and an end of the first air duct, which is away from the first vent, is connected to the second air duct.

4. The battery pack of claim 2, wherein the first vent is disposed at the bottom or the top of the housing, and the first air channel extends from the bottom of the housing to the top of the housing.

5. The battery pack of claim 1, further comprising at least one heat dissipation plate, wherein each heat dissipation plate is partially located in a gap between two opposite battery cells and is attached to and fixed to the two opposite battery cells.

6. The battery pack of claim 2, further comprising a battery management system circuit electrically connected to the N cells and a cooling plate fixedly connected to the battery management system circuit and the housing, respectively, wherein a gap between the cooling plate and the N cells forms at least part of the second air channel.

7. The battery pack of claim 6, wherein the housing comprises a lower housing and an end cap, and the battery management system circuit is positioned between the end cap and the cooling plate and is respectively attached to the end cap and the cooling plate.

8. The battery pack of claim 6, wherein the first vent is disposed at the bottom or top of the housing and/or the second vent is disposed at a side of the housing near a junction of the cooling plate and the housing.

9. The battery pack according to claim 1, wherein a filter member is provided at the first vent, the filter member being detachably attached to the housing; and a sealing element is arranged at the second ventilation opening and detachably connected with the shell.

10. The battery pack according to any of claims 1-9, wherein the battery pack comprises at least one cell module, wherein the cell module comprises a cell support and M cells, and the M cells are arranged opposite to each other in pairs and are all fixedly connected to the cell support; m is an even number less than or equal to N.