CN219553736U

CN219553736U - Lithium ion battery

Info

Publication number: CN219553736U
Application number: CN202320633920.1U
Authority: CN
Inventors: 窦金龙; 刘强
Original assignee: Yichun Jingyu Technology Co ltd
Current assignee: Yichun Jingyu Technology Co ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-08-18
Anticipated expiration: 2033-03-28

Abstract

The utility model discloses a lithium ion battery, which comprises: shell, battery monomer and fan. The shell is internally provided with an installation cavity, a first air channel is arranged on the shell, and the first air channel is communicated with a first air inlet and an air outlet; the battery unit is arranged in the mounting cavity and comprises a positive plate, a negative plate and a diaphragm, the positive plate and the negative plate are arranged in a stacked mode, the diaphragm is arranged between the positive plate and the negative plate, the positive plate, the negative plate and the diaphragm are wound into a stacked battery core, each layer of positive plate and each layer of negative plate are provided with heat conducting lugs, and the area of each heat conducting lug is gradually reduced from the middle to two ends along the thickness direction of the battery core and extends into the first air duct; the fan is connected with the shell, and the fan is used for producing the air current, and the air current loops through first air intake, first wind channel and air outlet. The area of the heat conduction lug gradually reduces from the middle to the two ends, so that the heat dissipation capacity of the middle layer for heat dissipation through the heat conduction lug can be enhanced, and the internal temperature of the battery cell can be balanced.

Description

Lithium ion battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a lithium ion battery.

Background

The lithium ion battery belongs to a metastable state system, is very sensitive to temperature, and can obviously accelerate the decay rate of the lithium ion battery when the temperature is too high, so that the control of the temperature of the lithium ion battery is particularly important.

At present, a common heat dissipation mode of a power battery is to dissipate heat on two surface surfaces of the lithium ion battery in the thickness direction through a water cooling pipe or an air cooling mode, but the heat conductivity of a diaphragm is relatively poor because the inside of the battery is composed of a positive electrode, a diaphragm and a negative electrode sandwich structure. Therefore, the battery with the surface radiating can generate a larger temperature gradient in the battery, thereby causing the phenomenon of nonuniform current distribution in the battery and affecting the uniformity of the performance of the lithium ion battery.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art, and therefore, the utility model provides a lithium ion battery, which can reduce the temperature gradient in the lithium ion battery and improve the consistency of the lithium ion battery.

According to an embodiment of the present utility model, a lithium ion battery includes

The lithium ion battery provided by the embodiment of the utility model has at least the following beneficial effects:

in some embodiments of the utility model, the thermally conductive tab is coated with an insulating layer.

In some embodiments of the utility model, the housing includes a top panel, a bottom panel, and two first side panels and two second side panels for enclosing the mounting cavity.

In some embodiments of the present utility model, the housing is connected with a mounting beam, two ends of the mounting beam are respectively connected with the two second side plates, a plurality of first mounting grooves for clamping the lower parts of the battery cells are arranged on the mounting beam at intervals along the length direction of the mounting beam, and a plurality of mounting beams are arranged at intervals along the width direction of the battery cells.

In some embodiments of the present utility model, a positioning beam detachably connected to the housing is disposed above the mounting beam, second mounting grooves are disposed on the positioning beam at intervals along the length direction of the positioning beam, and the upper parts of the battery cells are clamped into the second mounting grooves.

In some embodiments of the present utility model, a connecting portion is provided on the second side plate, a third mounting groove is provided on the connecting portion, and two ends of the positioning beam are respectively clamped into the two third mounting grooves to achieve connection with the housing.

In some embodiments of the utility model, the first air inlet and the air outlet are respectively disposed on the two first side plates.

In some embodiments of the present utility model, a second air inlet is provided at an upper portion of the housing, a plurality of battery cells are provided, the plurality of battery cells are spaced apart along a thickness direction thereof, two adjacent battery cells define a second air duct, and the second air duct is in communication with the first air duct and the second air inlet.

In some embodiments of the utility model, the second air inlet is disposed in a central region of the top plate.

In some embodiments of the utility model, a screen assembly is provided at the first air inlet, the second air inlet, and the air outlet.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural diagram of a lithium ion battery according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the embodiment of FIG. 1 with the top plate removed;

FIG. 3 is a schematic view of another view of the embodiment of FIG. 1;

fig. 4 is a schematic structural diagram of a battery cell according to an embodiment of the present utility model;

fig. 5 is a partial enlarged view of the outlet a in fig. 4.

Reference numerals:

the housing 100, the top plate 110, the second air inlet 111, the bottom plate 120, the first side plate 130, the first air inlet 131, the air outlet 132, the second side plate 140, the connecting part 141, the first air duct 101, the second air duct 102,

Battery cell 200, aluminum case 210, battery cell 220, positive electrode tab 221, positive electrode tab 2211, negative electrode tab 222, negative electrode tab 2221, diaphragm 223, heat conducting tab 224,

Mounting beam 310, first mounting slot 311, positioning beam 320, and second mounting slot 321.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, the description of the first and second is only for the purpose of distinguishing technical features, and should not be construed as indicating or implying relative importance or implying the number of technical features indicated or the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The lithium ion battery of the embodiment of the utility model comprises a shell 100, a battery cell 200 and a fan.

Referring to fig. 2 and 3, the housing 100 has a mounting cavity therein, and the housing 100 is provided with a first air duct 101, which is connected to a first air inlet 131 and an air outlet 132.

Referring to fig. 4 and 5, the battery cell 200 is provided in the mounting chamber, and thus, the case 100 can protect the battery cell 200 from external impacts, improving safety. The battery cell 200 comprises a positive plate 221, a negative plate 222 and a diaphragm 223, wherein the positive plate 221 and the negative plate 222 are stacked, the diaphragm 223 is arranged between the positive plate 221 and the negative plate 222, the positive plate 221, the negative plate 222 and the diaphragm 223 are wound into a stacked battery cell 220, each layer of positive plate 221 and each layer of negative plate 222 are provided with a heat conducting lug 224, and the area of the heat conducting lug 224 gradually decreases from the middle to the two ends along the thickness direction of the battery cell 220, and the heat conducting lug 224 extends into the first air duct 101. Specifically, the first air duct 101 is located at the lower part of the mounting cavity, and the battery unit 200 is vertically disposed so that the heat conducting tab 224 extends into the first air duct 101 to enhance the heat dissipation capacity of the heat conducting tab. The thickness direction of the battery cell 220 is the stacking direction of the battery cell 220.

The fan is connected with the housing 100, and the fan is used for generating an air flow, and the air flow sequentially passes through the first air inlet 131, the first air duct 101 and the air outlet 132. The fans are not shown in the figures.

It is also understood that the battery cells 200 of the lithium ion battery are wound in a laminated shape, and the battery cells 200 radiate heat through both surfaces of the battery cells 220 in the lamination direction. However, the heat generated from the intermediate layer is not easily diffused due to the poor heat conductive property of the separator 223, resulting in the temperature of the intermediate layer of the cell 220 being greater than that of the edge layer. And the heat dissipation of the middle layer of the battery cell 200 can be effectively assisted by the heat conducting tab 224. The area of the heat conduction tab 224 gradually decreases from the middle to the two ends, so that the heat dissipation capacity of the heat dissipation of the middle layer through the heat conduction tab 224 can be enhanced, and the internal temperature of the battery cell 200 can be well balanced by matching with the surface heat dissipation of the battery cell 200. So that the lithium ion battery has good consistency.

In some embodiments of the present utility model, the heat-conducting tabs 224 are coated with an insulating layer, specifically, the periphery of each heat-conducting tab 224 is coated with an insulating paint, so that two adjacent heat-conducting tabs 224 are not in direct contact. It can be appreciated that the insulating layer can prevent the heat conduction tabs 224 from being in contact with each other to cause short circuit, thereby improving safety.

In some embodiments of the present utility model, the housing 100 includes a top plate 110, a bottom plate 120, and two first side plates 130 and two second side plates 140 for enclosing a mounting cavity. Specifically, referring to fig. 1 and 2, the top plate 110 is a square plate, the bottom plate 120 is disposed parallel to the top plate 110 and below the lamp panel, two first side plates 130 are disposed at intervals along the left-right direction, and two second side plates 140 are disposed at intervals along the front-rear direction. It can be understood that the six plates enclose the installation cavity, and the structure is simple.

In some embodiments of the present utility model, the housing 100 is connected with the mounting beams 310, both ends of the mounting beams 310 are respectively connected with the two second side plates 140, the mounting beams 310 are provided with a plurality of first mounting grooves 311 for clamping the lower parts of the battery cells 200 at intervals along the length direction thereof, and the mounting beams 310 are provided with a plurality of first mounting grooves at intervals along the width direction of the battery cells 200. Specifically, referring to fig. 2, a plurality of mounting beams 310 are provided at intervals in the lateral direction, both ends of the lower portion of the battery cell 200 in the width direction are respectively engaged with the first mounting grooves 311 engaged with the adjacent two mounting beams 310, and the plurality of battery cells 200 can be provided at intervals in the lateral direction by the plurality of mounting beams 310 provided at intervals. The longitudinal direction of the mounting beam 310 is a front-rear direction, and a plurality of first mounting grooves 311 are provided at intervals along the longitudinal direction of the mounting beam 310. In this way, more battery cells 200 can be arranged in an array in the installation cavity, and the space is fully utilized.

Referring to fig. 2, in some embodiments of the present utility model, a positioning beam 320 detachably coupled to the housing 100 is provided above the mounting beam 310, and the positioning beam 320 is provided with second mounting grooves 321 spaced apart in the length direction thereof, and the upper portion of the battery cell 200 is caught in the second mounting grooves 321. It can be appreciated that the lower portion of the battery cell 200 is fixed by the mounting beam 310 in cooperation with the upper portion of the battery cell 200 fixed by the positioning beam 320. The structure is simple and the stability of the installation of the battery cell 200 can be improved.

Referring to fig. 2, in some embodiments of the present utility model, a connection part 141 is provided on the second side plate 140, a third mounting groove is provided on the connection part 141, and both ends of the positioning beam 320 are respectively snapped into the two third mounting grooves to achieve connection with the housing 100. Specifically, the two second side plates 140 are each provided with a connection portion 141 having a U-shaped structure. In this way, the positioning beam 320 can be conveniently detached, so that the battery cell 200 can be conveniently mounted and dismounted.

Referring to fig. 2, in some embodiments of the present utility model, the first air inlet 131 and the air outlet 132 are respectively disposed on the two first side plates 130. Specifically, the first air inlet 131 and the air outlet 132 are disposed opposite to each other, so that the air flow can be conveniently and effectively dissipated.

Referring to fig. 2, in some embodiments of the present utility model, a second air inlet 111 is provided at an upper portion of the housing 100, a plurality of battery cells 200 are provided, a plurality of battery cells 200 are spaced apart along a thickness direction thereof, and two adjacent battery cells 200 define a second air duct 102, and the second air duct 102 communicates with the first air duct 101 and the second air inlet 111. It can be appreciated that the air flow rapidly flows through the first air duct 101, low pressure is generated in the first air duct 101, the air flow in the second air duct 102 flows to the first air duct 101, and then the surface of the battery cell 200 is cooled, so that the air flow of the first air duct 101 and the second air duct 102 is driven by one fan to flow, and the surface of the battery cell 200 and the heat conducting tab 224 are cooled simultaneously, so that the structure is simple and ingenious.

Referring to fig. 1, in some embodiments of the present utility model, the second air inlet 111 is provided at a central region of the top plate 110. It will be appreciated that the second air inlet 111 is disposed in the central area of the top plate 110, so as to enhance heat dissipation in the center of the mounting cavity and equalize the temperature of the mounting cavity.

In some embodiments of the present utility model, a screen assembly is provided at the first air inlet 131, the second air inlet 111, and the air outlet 132. It is understood that the filter screen assembly can prevent debris from entering the installation cavity, and the inside of the lithium ion battery is protected from being damaged.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims

1. A lithium ion battery, comprising:

the air conditioner comprises a shell (100), wherein an installation cavity is formed in the shell (100), a first air channel (101) is formed in the shell (100), and the first air channel (101) is communicated with a first air inlet (131) and an air outlet (132);

the battery unit (200) is arranged in the installation cavity, the battery unit (200) comprises a positive plate (221), a negative plate (222) and a diaphragm (223), the positive plate (221) and the negative plate (222) are arranged in a stacked mode, the diaphragm (223) is arranged between the positive plate (221) and the negative plate (222), the positive plate (221), the negative plate (222) and the diaphragm (223) are wound into a stacked battery cell (220), each layer of positive plate (221) and each layer of negative plate (222) are provided with heat conducting lugs (224), and the area of each heat conducting lug (224) gradually decreases from the middle to two ends along the thickness direction of the battery cell (220), and the heat conducting lugs (224) extend into the first air duct (101) to be arranged;

the fan is connected with the shell (100), and is used for generating air flow, and the air flow passes through the first air inlet (131), the first air duct (101) and the air outlet (132) in sequence.

2. The lithium ion battery of claim 1, wherein the thermally conductive tab (224) is coated with an insulating layer.

3. A lithium ion battery according to claim 1, wherein,

the housing (100) comprises a top plate (110), a bottom plate (120) and two first side plates (130) and two second side plates (140) for enclosing the mounting cavity.

4. A lithium-ion battery according to claim 3, wherein,

the shell (100) is connected with a mounting beam (310), two ends of the mounting beam (310) are respectively connected with two second side plates (140), a plurality of first mounting grooves (311) used for being clamped at the lower parts of the battery cells (200) are formed in the mounting beam (310) at intervals along the length direction of the mounting beam, and a plurality of mounting beams (310) are formed in the width direction of the battery cells (200) at intervals.

5. A lithium ion battery according to claim 4, wherein,

the utility model discloses a battery cell, including installation roof beam (310), shell (100), roof beam (310) top is provided with location roof beam (320) of being connected can be dismantled to installation roof beam (310), location roof beam (320) are provided with second mounting groove (321) along its length direction interval, battery cell (200) upper portion card income second mounting groove (321).

6. A lithium ion battery according to claim 5, wherein,

the second side plate (140) is provided with a connecting part (141), the connecting part (141) is provided with a third mounting groove, and two ends of the positioning beam (320) are respectively clamped into the two third mounting grooves so as to be connected with the shell (100).

7. A lithium-ion battery according to claim 3, wherein,

the first air inlet (131) and the air outlet (132) are respectively arranged on the two first side plates (130).

8. A lithium ion battery according to claim 1, wherein,

the upper portion of shell (100) is provided with second air intake (111), battery monomer (200) are provided with a plurality ofly, and a plurality of battery monomer (200) are along its thickness direction interval setting, and two adjacent battery monomer (200) define second wind channel (102), second wind channel (102) intercommunication first wind channel (101) with second air intake (111).

9. A lithium ion battery according to claim 8, wherein,

the second air inlet (111) is arranged in the central area of the top plate (110).

10. A lithium ion battery according to claim 9, wherein,

the first air inlet (131), the second air inlet (111) and the air outlet (132) are provided with filter screen components.