CN218677325U

CN218677325U - Battery device

Info

Publication number: CN218677325U
Application number: CN202222962833.9U
Authority: CN
Inventors: 刘冰
Original assignee: China Lithium Battery Technology Co Ltd
Current assignee: China Lithium Battery Technology Co Ltd
Priority date: 2022-11-07
Filing date: 2022-11-07
Publication date: 2023-03-21
Anticipated expiration: 2032-11-07

Abstract

The utility model relates to a battery technology field discloses a battery device for solve the battery that exists among the prior art and analyse the problem of lithium easily under the low temperature condition. The battery device comprises a battery box and a battery arranged in the battery box, wherein a heating layer is arranged on the side surface of the battery and used for heating the battery, and the distance between the bottom edge of the heating layer and the bottom edge of the battery is more than or equal to 5mm and less than or equal to 25mm; the side surfaces of the cells are perpendicular to the bottom surface of the battery case and are arranged parallel to the stacking direction of the cells.

Description

Battery device

Technical Field

The utility model relates to a battery technology field especially relates to a battery device.

Background

When the lithium ion battery is charged, lithium ions are extracted from the positive electrode and inserted into the negative electrode, however, under a low temperature condition, the ion conductivity of the electrolyte is reduced, the impedance of the lithium ions extracted from the positive electrode and inserted into the negative electrode is increased greatly, and the new increase of the impedance of the inserted negative electrode is larger, so that lithium precipitation is caused, which causes the performance of the battery to be reduced, the cycle life to be shortened, and simultaneously, the quick charge capacity of the battery is limited, and serious consequences such as combustion and explosion can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery device for solve the battery that exists among the prior art and analyse the problem of lithium easily under the low temperature condition.

The embodiment of the utility model provides a battery device, this battery device includes battery box and sets up the battery in the battery box, the side of battery is provided with the zone of heating, the zone of heating is used for heating the battery, the distance between the bottom edge of zone of heating and the bottom edge of battery is more than or equal to 5mm and is less than or equal to 25mm;

the side surfaces of the cells are perpendicular to the bottom surface of the battery case and are arranged parallel to the stacking direction of the cells.

The utility model discloses beneficial effect as follows:

in the battery device, the side surface of the battery is provided with the heating layer, and the heating layer can heat the battery under the low-temperature condition, so that the lithium precipitation phenomenon of the battery in the charging process is relieved, and the stability of the performance of the battery is maintained; meanwhile, when the battery is specifically arranged, the bottom edge of the heating layer is higher than the bottom edge of the battery, so that the heating layer can be prevented from contacting with a liquid cooling plate or a bottom plate positioned at the bottom of the battery box, heat dissipated through the liquid cooling plate or the bottom plate is reduced, and the heating efficiency is improved; moreover, the closed part coated by the blue film outside the battery shell is usually positioned at the bottom of the bottom surface or the side surface of the battery, so that the heat can be prevented from being excessively accumulated at the closed part coated by the blue film by enabling the bottom edge of the heating layer to be higher than the bottom edge of the battery by a certain distance, further, bubbles are prevented from being generated in the blue film, and the insulation and sealing performances of the blue film are protected from being influenced.

Drawings

Fig. 1 is a schematic view of a combination of a battery and a heating layer provided in an embodiment of the present invention;

fig. 2 is a schematic diagram of a position relationship among a side surface of the battery, an orthographic projection of the heating layer on the side surface of the battery, and an orthographic projection of the fixing layer on the side surface of the battery provided by the embodiment of the present invention;

fig. 3 is a schematic view of a combination of a fixing layer and a battery according to an embodiment of the present invention;

fig. 4 is a schematic view of a combination of a heating layer and a fixing layer provided in an embodiment of the present invention.

Reference numerals:

10-a battery; 101-side; 20-heating layer; 201-a body portion; 202-an epitaxial portion; 203-a conforming portion; 204-avoiding the space; 30-a fixing layer; 301-a first portion; 302-a second portion; 40-cavities.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

An embodiment of the utility model provides a battery device for solve the battery that exists among the prior art and analyse the problem of lithium easily under the low temperature condition.

As shown in fig. 1, the battery device includes a battery case and a battery 10 disposed in the battery case, a side surface 101 of the battery 10 is provided with a heating layer 20, the heating layer 20 is used to heat the battery 10, and a distance between a bottom edge of the heating layer 20 and a bottom edge of the battery 10 is 5mm or more and 25mm or less, wherein the side surface 101 of the battery 10 is perpendicular to a bottom surface of the battery case and is disposed parallel to a stacking direction of the battery 10.

The battery 10 is a rectangular parallelepiped structure including a top surface, a bottom surface, two end surfaces, and two side surfaces 101, in the battery box, the bottom surface of the battery 10 is disposed toward a liquid cooling plate or a bottom plate at the bottom of the battery box, the top surface and the bottom surface of the battery 10 are disposed opposite to each other, and if the stacking direction of the battery 10 is taken as a reference, the end surfaces of the battery 10 are disposed perpendicular to the stacking direction of the battery 10, the side surfaces 101 of the battery 10 are disposed parallel to the stacking direction of the battery 10 and perpendicular to the bottom surface of the battery box, in addition, in the battery box, the internal space of the battery box is divided into a plurality of accommodating spaces for accommodating the batteries 10 by structural beams, and a plurality of batteries 10 can be placed in the accommodating spaces after being stacked, wherein the side surfaces 101 of the battery 10 face a frame extending in the stacking direction of the battery 10 in the battery box, or the side surfaces 101 of the battery 10 face structural beams extending in the stacking direction of the battery box along the battery 10.

The battery 10 may be provided with the heating layer 20 on one side thereof, or may be provided with the heating layers 20 on both sides, respectively. Under the low temperature condition, the heating layer 20 can heat the battery 10, so that the lithium precipitation phenomenon of the battery 10 in the charging process is relieved, and the stability of the performance of the battery 10 is maintained; and, in order to make zone of heating 20 have higher heating efficiency, when specifically setting up, the bottom edge of zone of heating 20 is higher than the bottom edge of battery 10, this is because, liquid cooling board and bottom plate are the higher metal material of heat conductivity, zone of heating 20 if with liquid cooling board or bottom plate contact, liquid cooling board or bottom plate can take away a part of heat that zone of heating 20 produced, lead to the heat to run off, the bottom edge through making zone of heating 20 exceeds the certain distance in the bottom edge of battery 10, can avoid zone of heating 20 and the contact of the liquid cooling board or the bottom plate of battery box bottom, reduce the heat that scatters and disappears through liquid cooling board or bottom plate, and the heating efficiency is improved.

Meanwhile, the closed end of the housing of the battery 10 covered by the blue film is often located at the bottom of the bottom surface or the side surface 101 of the battery 10, and the heating at the closed end can cause bubbles to be generated in the blue film, which affects the insulation and sealing performance of the blue film, so that the excessive heat accumulation at the closed end of the blue film can be avoided by making the bottom edge of the heating layer 20 higher than the bottom edge of the battery 10 by a certain distance.

In addition, in the assembly process of the battery 10, the structural adhesive at the bottom of the battery 10 may overflow to the side 101, if the heating layer 20 contacts with the liquid cooling plate or the bottom plate at the bottom of the battery 10, the structural adhesive may easily stick the heating layer 20, so that the heating layer 20 is not easily separated from the surface of the battery 10 when the heating layer 20 is inspected and maintained in the later period, or the heating layer 20 is easily damaged in the separation process.

Specifically, the distance L between the bottom edge of the heating layer 20 and the bottom edge of the battery 10 is greater than or equal to 5mm and less than or equal to 25mm, for example, the value of L may be 5mm, 8mm, 11mm, 13mm, 16mm, 19mm, 22mm, 25mm, or another value between 5mm and 25 mm.

In the case where the distance between the bottom edge of the heating layer 20 and the bottom edge of the battery 10 satisfies the above range, the heating layer 20 should cover as much other regions of the battery 10 as possible to have a larger contact area with the battery 10 and improve the heating efficiency, and optionally, the orthographic projection of the heating layer 20 on the plane of the side surface 101 of the battery 10 covers the top edge of the battery 10, that is, the top edge of the heating layer 20 may be flush with the top edge of the battery 10 or beyond the top edge of the battery 10.

During the concrete connection, bond through the heat conduction glue between zone of heating 20 and the battery 10, the heat conduction glue can fill the clearance between zone of heating 20 and the battery 10, improves heat transfer efficiency, simultaneously, can also realize the fixed of zone of heating 20.

In some embodiments, a fixing layer 30 is disposed on a side of the heating layer 20 away from the battery 10, the fixing layer 30 can perform a heat preservation function on the heating layer 20, so as to reduce heat dissipated from the heating layer 20 to an external environment, and the fixing layer 30 can also perform a protection function on the heating layer 20, so as to prevent the heating layer 20 from being damaged and prolong the service life of the heating layer 20.

The fixing layer 30 may be a plate-shaped structure made of a heat insulating material, the heat insulating material may be foam, and the foam has the characteristic of light weight besides good heat insulating performance, and is beneficial to light weight of the battery device.

As shown in fig. 2, the fixing layer 30 includes a first portion 301 and a second portion 302, the first portion 301 is located on the surface of the heating layer 20 and connected to the heating layer 20, specifically, the first portion 301 may be adhered to the heating layer 20 by structural adhesive, the second portion 302 extends out of the heating layer 20, and an orthographic projection of the second portion 302 on the plane of the side 101 of the battery 10 is located inside the side 101 of the battery 10, the second portion 302 is connected to the side 101 of the battery 10, and specifically, the second portion 302 may be connected to the side 101 of the battery 10 by structural adhesive.

In this way, the heating layer 20 can be directly connected to the battery 10, and can also be indirectly connected to the battery 10 through the fixing layer 30, so as to improve the fixing effect of the heating layer 20. Under the condition that the heating layer 20 is bonded with the battery 10 through the heat conducting glue, because the bonding area between the heating layer 20 and the battery 10 is limited, and the gluing mode is easy to lose efficacy at high temperature, the fixing layer 30 ensures the fixing effect between the heating layer 20 and the battery 10, and avoids the heating layer 20 from falling off from the surface of the battery 10 in the using process.

The heating layer 20 comprises an attaching portion 203 attached to the side surface 101 of the cell 10, an orthographic projection of the attaching portion 203 on the plane of the side surface 101 of the cell 10 is positioned in the side surface 101 of the cell 10, and the area of the attaching portion 203 is m ₁ The area of the second portion 302 of the pinned layer 30 is denoted as m ₂ When m is ₁ When the contact area between the heating layer 20 and the battery 10 is too small, the heating effect of the heating layer 20 on the battery 10 is affected, and when m is smaller ₁ When too large, the area of the side surface 101 of the battery 10 occupied by the heating layer 20 is large, so that the area m of the second portion 302 of the fixing layer 30 is large ₂ Less, affecting the fixing effect of the fixing layer 30 and the battery 10, and further affecting the fixing effect of the heating layer 20 and the battery 10, in order to overcome the above problems, in some embodiments, m ₁ And m ₂ The following relationship is satisfied: m is more than or equal to 2.33 ₁ /m ₂ ≤9.0，m ₁ And m ₂ The ratio of (b) may be specifically 2.33, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0.

As can be seen from the above, with a certain gap between the bottom edge of the heating layer 20 and the bottom edge of the cell 10, at least part of the second portion 302 may be disposed between the bottom edge of the heating layer 20 and the bottom edge of the cell 10 when specifically disposed. In this way, the space between the bottom edge of the heating layer 20 and the bottom edge of the battery 10 is utilized, so that at least part of the second portion 302 extends into the space and is connected with the battery 10, thereby not only ensuring the fixing effect of the fixing layer 30 and the battery 10, but also correspondingly reducing the area of other areas of the side surface 101 of the battery 10 occupied by the second portion 302, being beneficial to increasing the contact area between the heating layer 20 and the battery 10 and improving the heating effect of the heating layer 20.

In some embodiments, as shown in fig. 3, the first portion 301, the second portion 302, and the side 101 of the battery 10 enclose a cavity 40 for receiving the heater layer 20, the heater layer 20 being located within the cavity 40.

As shown in fig. 3, the thicknesses of the first portion 301 and the second portion 302 are equal, the first portion 301 is bent relative to the second portion 302, the first portion 301, the second portion 302 and the side 101 of the battery 10 jointly enclose a cavity 40 capable of accommodating the heating layer 20, or the first portion 301 and the second portion 302 are flush with a surface facing away from the battery 10, the thickness of the first portion 301 is smaller than that of the second portion 302, and the first portion 301, the second portion 302 and the side 101 of the battery 10 jointly enclose the cavity 40, in any of the above manners, the heating layer 20 can be in close contact with the side 101 of the battery 10, and the second portion 302 of the fixing layer 30 can be in close contact with the side 101 of the battery 10. Optionally, the first portion and 301 second portion 302 may be of unequal thickness.

In the battery box, a plurality of batteries 10 are stacked in a first direction to form a battery pack, the plurality of batteries 10 may share one heating layer 20, that is, the heating layer 20 extends in the first direction and is disposed at the side 101 of the plurality of batteries 10, the battery pack is provided with end plates (not shown) at both ends in the first direction, and the heating layer 20 may be fixedly connected with the end plates, so that the fixing effect of the heating layer 20 may be improved.

The first direction is the X-axis direction in fig. 1 to 4.

Alternatively, the heating layer 20 and the end plate may be connected by fasteners.

And/or, in the case that the fixing layer 30 is disposed on the side of the heating layer 20 away from the battery 10, the fixing layer 30 also extends along the first direction, and the fixing layer 30 may also be fixedly connected with the end plate, so as to improve the fixing effect of the fixing layer 30 and further improve the fixing effect of the heating layer 20, and optionally, the fixing layer 30 may be connected with the end plate through a fastener, or bonded.

As shown in fig. 4, the heating layer 20 includes a main body portion 201 and extension portions 202 disposed at both ends of the main body portion 201, the extension portions 202 are connected to the end plates, and the main body portion 201 and the extension portions 202 form an avoiding space 204, and the fixed layer 30 is connected to the end plates through the avoiding space 204.

The main body portion 201 of the heating layer 20 corresponds to the side surface of the battery pack, the extension portion 202 extends to the outside of the battery pack and reaches the side surface of the end plate so as to be connected to the end plate, and the width dimension of the extension portion 202 in the Z-axis direction is smaller than the width dimension of the main body portion 201 in the Z-axis direction, so that the main body portion 201 and the extension portion 202 can form an avoiding space 204, the fixing layer 30 covers the surface of the heating layer 20, and the fixing layer 30 can be connected to the end plate through the avoiding space 204.

The extension portion 202 is disposed near the top edge of the heating layer 20, and after the extension portion 202 is connected to the end plate, the upper half of the heating layer 20 can be prevented from being folded downward due to its own weight.

The heating layer 20 is used to heat the battery 10 when energized, and the wiring harness inside the heating layer 20 is led out from one or both ends of the heating layer 20, or the wiring harness inside the heating layer 20 is led out from the top edge of the heating layer 20.

Optionally, the wire harness inside the heating layer 20 is led out from two ends of the heating layer 20, and the led-out position of the wire harness is arranged at the edge of the upper half part of the heating layer 20. As shown in fig. 4, the wire harness inside the heating layer 20 is led out from two ends of the heating layer 20, and the led-out position of the wire harness is close to the top edge of the heating layer 20, so that the wire harness has a hanging effect on the heating layer 20, and the upper half part of the heating layer 20 is prevented from being turned over downwards due to self gravity.

As can be seen from the above description, in the embodiment of the present invention, the side surface 101 of the battery 10 is provided with the heating layer 20, and under a low temperature condition, the heating layer 20 can heat the battery 10, so as to alleviate the lithium deposition phenomenon of the battery 10 during the charging process, and maintain the stability of the performance of the battery 10; meanwhile, when the battery box is specifically arranged, the bottom edge of the heating layer 20 is higher than the bottom edge of the battery 10, so that the heating layer 20 can be prevented from contacting with a liquid cooling plate or a bottom plate positioned at the bottom of the battery box, heat dissipated through the liquid cooling plate or the bottom plate is reduced, and the heating efficiency is improved.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A battery device is characterized by comprising a battery box and a battery arranged in the battery box, wherein a heating layer is arranged on the side surface of the battery and used for heating the battery, and the distance between the bottom edge of the heating layer and the bottom edge of the battery is more than or equal to 5mm and less than or equal to 25mm;

2. The battery device according to claim 1, wherein a side of the heating layer facing away from the battery is provided with a fixing layer, the fixing layer comprising a first portion and a second portion, the first portion being located on a surface of the heating layer and connected to the heating layer, the second portion extending beyond the heating layer, and an orthographic projection of the second portion on a plane in which a side of the battery is located being located within the side of the battery, the second portion being connected to the side of the battery.

3. The battery device of claim 2, wherein at least a portion of the second portion is located between a bottom edge of the heating layer and a bottom edge of the battery.

4. The battery device of claim 2, wherein the first portion, the second portion, and sides of the battery enclose a cavity for receiving the heating layer, the heating layer being located within the cavity.

5. The battery device according to any one of claims 2 to 4, wherein the heating layer includes a fitting portion that is fitted to a side surface of the battery, the fitting portionThe orthographic projection of the plane on which the side surface of the battery is positioned in the side surface of the battery, and the area of the joint part is m ₁ The area of the second part is m ₂ ，m ₁ And m ₂ The following relationship is satisfied: m is more than or equal to 2.33 ₁ /m ₂ ≤9。

6. The battery device according to any one of claims 2 to 4, wherein a plurality of said cells are stacked in a first direction to form a cell stack, both ends of said cell stack in said first direction are provided with end plates, and said fixing layer extends in said first direction and is connected to said end plates;

and/or the heating layer extends along the first direction and is connected with the end plate.

7. The battery device according to claim 6, wherein the heating layer includes a main body portion and extension portions provided at both ends of the main body portion, the extension portions are connected to the end plates, and the main body portion and the extension portions form an escape space;

the fixed layer is connected with the end plate through the avoiding space.

8. The battery device according to any one of claims 2 to 4, wherein the fixing layer is a plate-like structure made of a heat insulating material.

9. The cell device according to claim 1 or 2, wherein an orthographic projection of the heating layer on a plane of the side face of the cell is flush with the top edge of the cell.

10. The battery device according to claim 1 or 2, wherein the heating layer is configured to heat the battery when energized, the wiring harness inside the heating layer is led out from both ends of the heating layer, and the lead-out position of the wiring harness is provided at an upper half edge of the heating layer.