CN213043002U

CN213043002U - Power battery pack

Info

Publication number: CN213043002U
Application number: CN202021321572.7U
Authority: CN
Inventors: 朱书伟
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-04-23
Anticipated expiration: 2030-07-07

Abstract

The utility model is suitable for a lithium ion battery field provides a power battery package, including box, battery module and liquid cooling board, the box includes hollow shell and locates in the shell and separate into the baffle of placing the chamber and liquid cooling chamber with the shell, and the battery module has a plurality ofly and arranges in rows in placing the intracavity, and the liquid cooling board is located in the liquid cooling intracavity and is connected with the baffle, and the liquid cooling board has a plurality ofly, and each liquid cooling board corresponds the setting with a battery module in order to carry out temperature control to the battery module; the power battery pack further comprises a heat preservation layer, the heat preservation layer is arranged in the liquid cooling cavity and is opposite to the liquid cooling plate, and the heat preservation layer at least covers the cavity wall of the liquid cooling cavity, which deviates from the partition plate. The utility model provides a power battery package can reduce heat exchange efficiency, slows down the decay rate of thermal-insulated intracavity portion temperature, reduces the influence of external environment temperature to power battery package to reduce the required energy of operation of battery thermal management system, reach energy-conserving effect.

Description

Power battery pack

Technical Field

The utility model belongs to the lithium ion battery field especially relates to a power battery package.

Background

The power battery is used as one of clean energy, has high energy density, almost has no adverse effect on environment and ecology, is widely applied to various industries and fields, in the automobile industry, the power battery pack is the only power energy source of the pure electric automobile at present, and when the power battery pack has many advantages, also has many defects, such as large influence by temperature, too low temperature, the working efficiency of a power battery module can be influenced, and too high temperature can cause the expansion and combustion of the power battery module and even guarantee, thereby causing certain threats to life and property.

In order to solve the heat insulation problem of the power battery pack, a battery heat management system is arranged. In the battery thermal management system, the liquid cooling plate is a key component for ensuring the normal work of the battery module. The battery modules work efficiently and durably, the temperature of the battery modules is required to be within a proper temperature range (25-45 ℃), and the temperature difference among the battery modules is less than 5 ℃. The battery thermal management system regulates when the ambient temperature of the battery module is higher or lower than the temperature range. The operation of the battery thermal management system needs energy, the heat preservation of the cavity where the liquid cooling plate or the battery module is located slows down the attenuation efficiency of the internal temperature, the energy needed by the operation of the battery thermal management system is favorably reduced, and the energy-saving effect is achieved.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome above-mentioned prior art not enough, provide a power battery package, it aims at reducing the required energy of operation of battery thermal management system.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

a power battery pack comprises a box body, battery modules and liquid cooling plates, wherein the box body comprises a hollow shell and a partition plate which is arranged in the shell and divides the shell into a placing cavity and a liquid cooling cavity; the power battery pack further comprises a heat preservation layer, the heat preservation layer is arranged in the liquid cooling cavity and is opposite to the liquid cooling plate, and the heat preservation layer at least covers the cavity wall of the liquid cooling cavity, which deviates from the partition plate.

Through adopting above-mentioned technical scheme, the setting of heat preservation can reduce heat exchange efficiency, slows down the decay rate of thermal-insulated intracavity portion temperature, reduces the influence of external environment temperature to power battery package to reduce the required energy of operation of battery thermal management system, reach energy-conserving effect. The heat preservation is made by the aerogel material to cover the liquid cooling chamber at least and leave the chamber wall of baffle, can further reduce battery thermal management system's the required energy of operation, reach better energy-conserving effect.

In one embodiment, a gap exists between the liquid cooling plates and the heat insulation layer, and the gap space forms an air layer to play a role in heat insulation.

In one embodiment, the power battery pack further comprises a first heat conduction layer, the first heat conduction layer is arranged corresponding to the battery module, and the first heat conduction layer is clamped between the battery module and the partition plate.

Through adopting above-mentioned technical scheme, improve the heat conduction efficiency between battery module and the baffle.

In one embodiment, the power battery pack further comprises a second heat conduction layer, the second heat conduction layer is arranged corresponding to the battery module, and the second heat conduction layer is clamped between the connecting partition plate and the liquid cooling plate.

Through adopting above-mentioned technical scheme, improve the heat conduction efficiency between liquid cooling board and the baffle.

In one embodiment, the first heat conduction layer and/or the second heat conduction layer are heat conduction silica gel.

Through adopting above-mentioned technical scheme to further improve heat conduction efficiency.

In one embodiment, the first heat conducting layer has a thickness of 0.05-0.3 mm; and/or the thickness of the second heat-conducting layer is 0.05-0.3 mm. Through adopting above-mentioned technical scheme, be favorable to further improving the heat conduction efficiency between battery module and the baffle, between liquid cooling board and the baffle.

In one embodiment, a heat insulation layer is arranged between two adjacent battery modules. Through adopting above-mentioned technical scheme, separate between each battery module to effectively reduce the heat transfer between each battery module 20. In case single battery module high temperature takes place the conflagration, can effectively slow down flame or heat transfer to adjacent battery module, when preventing harm diffusion, has increased the emergent reply time that harm takes place.

In one embodiment, both sides of each battery module are provided with a heat insulation layer.

Through adopting above-mentioned technical scheme, can further slow down the heat transfer between each battery module.

In one embodiment, the side of the thermal insulation layer is spaced from the cavity wall of the placing cavity.

Through adopting above-mentioned technical scheme, avoid setting up of insulating layer to cause the convenience of obstacle and improvement assembly operation to battery module's expend with heat and contract with cold.

In one embodiment, the heat insulation layer is provided with a third heat conduction layer on the side facing the battery module, and the third heat conduction layer is connected with the partition plate. Through adopting above-mentioned technical scheme, can improve battery module's cooling efficiency.

In one embodiment, the third thermally conductive layer is made of a graphene material.

Through adopting above-mentioned technical scheme, further improve battery module's radiating efficiency.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic partial structure diagram of a power battery pack provided in an embodiment of the present application;

fig. 2 is an enlarged view of a portion of the structure of fig. 1 at a.

Wherein, in the figures, the respective reference numerals:

10. a box body; 11. a housing; 12. a partition plate; 20. a battery module; 30. a liquid-cooled plate; 40. a heat-insulating layer; 50. a first thermally conductive layer; 60. a second thermally conductive layer; 70. an insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must be in a particular orientation, constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

Referring to fig. 1 and 2, the present embodiment provides a power battery pack, which includes a case 10, a battery module 20, and a plurality of liquid cooling plates 30, wherein the case 10 includes a hollow housing 11 and a partition plate 12 disposed in the housing 11 and dividing the housing 11 into a placement cavity and a liquid cooling cavity, the plurality of battery modules 20 are disposed in the placement cavity in rows, the plurality of liquid cooling plates 30 are disposed in the liquid cooling cavity and connected to the partition plate 12, the plurality of liquid cooling plates 30 are disposed, and each liquid cooling plate 30 is disposed corresponding to one battery module 20 to adjust the temperature of the battery module 20.

The power battery pack further comprises a heat insulation layer 40, the heat insulation layer 40 is made of aerogel materials, the heat insulation layer 40 is arranged in the liquid cooling cavity and is opposite to the liquid cooling plate 30, and the heat insulation layer 40 at least covers the cavity wall of the liquid cooling cavity back separation plate 12.

For convenience of description, the power battery pack is horizontally disposed, the disposing chamber is located above the partition plate 12, and the liquid cooling chamber is located below the partition plate 12. The housing 11 is rectangular and is formed by connecting an upper plate, a lower plate, a left plate, a front plate, a right plate and a rear plate in an enclosing manner.

The liquid cooling plate 30 is provided in plurality and corresponds to the battery module 20. Each of the liquid-cooled plates 30 is connected to the partition plate 12 to perform temperature regulation of the corresponding battery module 20 through the partition plate 12. The liquid cooling chamber is a single chamber, and the liquid cooling plates 30 are placed in the liquid cooling chamber, connected via pipes, and controlled by the controller in a unified manner to form overall and local temperature control of the battery modules 20.

The aerogel is used as a heat-insulating layer 40 and is arranged on the wall of the liquid cooling cavity (the upper surface of the lower plate) away from the partition plate 12, so that heat is effectively prevented from being transferred to the shell and radiated outwards through the shell, and the heat-insulating effect is achieved. Therefore, the arrangement of the heat preservation layer 40 can reduce the heat exchange efficiency, slow down the decay rate of the temperature in the heat insulation cavity and reduce the influence of the external environment temperature on the power battery pack, so that the energy required by the operation of the battery heat management system is reduced, and the energy-saving effect is achieved.

The insulating layer 40 is made of aerogel material, and aerogel has excellent heat insulating properties. Aerogel thermal conductivity is 2-3 orders of magnitude lower than corresponding glassy materials. The radiation heat conduction of the aerogel can be further reduced by means of doping, the thermal conductivity of the carbon-doped aerogel at normal temperature and normal pressure can be as low as 0.013w/m, and the carbon-doped aerogel is a solid material with the lowest thermal conductivity. The silicon aerogel can become a novel high-temperature heat-insulating material by doping titanium dioxide, and the thermal conductivity at 800K is only 0.03 w/m. Therefore, the heat preservation layer 40 is made of aerogel materials, so that the heat exchange efficiency can be further reduced, and a better energy-saving effect is achieved. In addition, the aerogel has good temperature resistance, can bear the high temperature that 600 glue materials made, and the ability, fine chemical stability can not take place chemical reaction with battery module 20. And the weight is light, the sound insulation and shock absorption are realized, and the environment is protected and the toxicity is avoided.

In this embodiment, the insulating layer 40 covers at least the wall of the liquid cooling chamber away from the partition 12. In other words, the housing 11 is provided with the insulating layer 40 at least on the upper surface of the lower plate thereof, and the insulating layer 40 separates the lower plate from the air in the liquid-cooling chamber, so that the cold of the liquid-cooling chamber is blocked by the insulating layer 40 and cannot reach the lower plate, thereby reducing the radiation of the cold of the liquid-cooling chamber to the outside via the lower plate. Meanwhile, the external heat is blocked by the heat-insulating layer 40 and is difficult to reach the liquid cooling chamber to realize heat exchange. Therefore, the design can further reduce the heat exchange efficiency, reduce the energy required by the operation of the battery heat management system and achieve better energy-saving effect. Those skilled in the art can further arrange the left chamber wall, the front chamber wall, the right chamber wall and/or the rear chamber wall of the liquid cooling chamber with the insulating layer 40 to further reduce the heat exchange efficiency.

Referring to fig. 1 and 2, in an embodiment of the present application, there is a gap between the liquid cooling plates, and a gap between the liquid cooling plates and the heat insulating layer, and the gap space contains air to form an air layer, and the air layer enhances the heat insulating effect.

Referring to fig. 2, in an embodiment of the present application, the power battery pack further includes a first heat conduction layer 50, the first heat conduction layer 50 is made of a flexible material, the first heat conduction layer 50 is provided in plural and is disposed corresponding to the battery modules 20, and two sides of any one first heat conduction layer 50 are respectively connected to the battery modules 20 and the partition 12.

The upper side surface of the first heat conductive layer 50 is connected to the battery module 20, and the lower side surface thereof is connected to the separator 12. The first thermally conductive layer 50 is made of a thermally conductive material, and the first thermally conductive layer 50 thermally transfers the battery module 20 and the separator 12. Generally, the partition 12 is an aluminum plate, and has a good heat transfer function. The separator 12 is made of a rigid material, and the separator 12 and the battery module 20 are directly abutted to each other so that a gap is inevitably formed locally, and the gap is filled with air. Air is a poor conductor of heat and can severely impede the transfer of heat between the contacting surfaces. The first heat conduction layer 50 is made of flexible materials, the first heat conduction layer 50 is arranged between the partition board 12 and the battery module 20, the first heat conduction layer 50 can be correspondingly adjusted according to the outer surface shapes of the partition board 12 and the battery module 20, air in the gap is discharged, the contact surfaces are in good full contact, face-to-face contact is really achieved, and heat conduction efficiency is improved.

Preferably, the first heat conducting layer 50 is a heat conducting silica gel. The heat-conducting silica gel has high heat conductivity and good electrical insulation. In addition, heat conduction silica gel has high adhesion, and heat conduction silica gel adopts heat conduction silica gel as the connection of battery module 20 and baffle 12, can close the tolerance between battery module 20 and the baffle 12 for the better abundant contact of contact surface improves heat-conduction efficiency.

Preferably, the first thermally conductive layer 50 is 0.05-0.3mm thick. Specifically, the thickness of the first heat conduction layer 50 may be 0.05mm, 0.06mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.2mm, 0.21mm, 0.24mm, 0.26mm, 0.29mm, 0.3mm, or the like. The thermal conductivity of the heat conductive silica gel is superior to that of air and inferior to that of a metal material. In this scheme, the main effect of heat conduction silica gel is to fill the space between battery module 20 and baffle 12. Therefore, the reduction in the thickness of the first thermally conductive layer 50 is advantageous in improving the thermal conductivity efficiency of the battery module 20 and the separator 12.

The heat-conducting silica gel has viscosity, and is coated on the separator 12 or the battery module 20 in a coating manner to control the thickness of the heat-conducting silica gel. The battery module 20, the first heat conducting layer 50 and the separator 12 are connected by bonding. The connection mode has convenient operation and low manufacturing cost.

In another embodiment of the present application, the power battery pack further includes a second heat conduction layer 60, the second heat conduction layer 60 is made of a flexible material, the second heat conduction layer 60 is multiple and is disposed corresponding to the battery module 20, and two sides of any second heat conduction layer 60 are respectively connected to the partition 12 and the liquid cooling plate 30. For similar reasons as with the first layer 50, the second layer 60 is disposed between the separator 12 and the liquid cooled plate 30 to improve heat transfer efficiency.

The second heat conducting layer 60 is a heat conducting silica gel. The thickness of the second heat conducting layer 60 is 0.05-0.3 mm. Specifically, the thickness of the second heat conduction layer 60 is 0.05mm, 0.06mm, 0.08mm, 0.1mm, 0.12mm, 0.15mm, 0.17mm, 0.2mm, 0.21mm, 0.24mm, 0.26mm, 0.29mm, 0.3mm, or the like. The second heat conduction layer 60 has viscosity, and is coated on the partition plate 12 or the liquid cooling plate 30 in a coating mode to control the thickness of the heat conduction silica gel, and the partition plate 12, the second heat conduction layer 60 and the liquid cooling plate 30 are in adhesive connection. This arrangement can improve the efficiency of heat conduction between the partition plate 12 and the liquid-cooled plate 30 and reduce the manufacturing cost for the similar reason as the first heat conductive layer 50.

Referring to fig. 2, in an embodiment of the present application, a heat insulation layer 70 is disposed between the battery modules 20, and the heat insulation layer 70 is made of an aerogel material.

The provision of the heat insulating layer 70 separates the battery modules 20 from each other to effectively reduce heat transfer between the battery modules 20. In case a fire disaster occurs when the temperature of a single battery module 20 is too high, the transmission of flame or heat to the adjacent battery modules 20 can be effectively slowed down, and the emergency response time for the occurrence of damage is increased while the diffusion of damage is prevented.

Referring to fig. 1, in another embodiment of the present application, heat insulation layers 70 are disposed on both sides of each battery module 20. This arrangement can further slow down the heat transfer between the battery modules 20.

In another embodiment of the present application, the sides of the insulating layer 70 are spaced from the walls of the placement chamber. Considering that the battery module 20 has the phenomenon of expansion with heat and contraction with cold in the use process, the side of the thermal insulation layer 70 is not connected with the housing, so that the battery module 20 is not hindered when the battery module 20 expands with heat and contracts with cold. In this embodiment, the thermal insulation layer 70 is attached to the side of the electrical measurement module. The side of the heat insulation layer 70 is spaced from the cavity wall of the placing cavity. The convenience of the assembly operation is improved while the thermal expansion and contraction of the battery module 20 are not hindered.

In another embodiment of the present application, the heat insulating layer 70 is provided with a third heat conductive layer (not shown) on the side facing the battery module 20, and the third heat conductive layer is connected to the separator 12. The third heat conduction layer guides heat from the side of the battery module 20 to the partition plate 12, and the liquid cooling plate 30 cools the partition plate 12. This design can improve the cooling efficiency of battery module 20.

Preferably, the third thermally conductive layer is made of a graphene material. Graphene has excellent thermal conductivity. The third heat conduction layer made of the graphene material can further improve the heat dissipation effect of the battery module 20. In other embodiments, the third thermally conductive layer may be made of a metal material or other non-metal materials, so long as the third thermally conductive layer has good thermal conductivity to realize thermal conduction between the battery module 20 and the separator 12.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims

1. A power battery pack comprises a box body, a battery module and liquid cooling plates, and is characterized in that the box body comprises a hollow shell and a partition plate which is arranged in the shell and divides the shell into a placing cavity and a liquid cooling cavity, a plurality of battery modules are arranged in the placing cavity in rows, the liquid cooling plates are arranged in the liquid cooling cavity and are connected with the partition plate, a plurality of liquid cooling plates are arranged, and each liquid cooling plate and one battery module are correspondingly arranged to regulate the temperature of the battery module; the power battery pack further comprises a heat insulation layer, the heat insulation layer is arranged in the liquid cooling cavity and is opposite to the liquid cooling plate, and the heat insulation layer at least covers the liquid cooling cavity and is away from the cavity wall of the partition plate.

2. The power battery pack of claim 1, wherein a gap exists between the liquid-cooled plates and the insulating layer.

3. The power battery pack of claim 1, further comprising a first heat conducting layer, wherein the first heat conducting layer is disposed corresponding to the battery module, and the first heat conducting layer is sandwiched between the battery module and the partition.

4. The power battery pack of claim 3, further comprising a second heat conducting layer disposed in correspondence with the battery module, wherein the second heat conducting layer is sandwiched between the separator and the liquid-cooled plate.

5. The power battery pack of claim 4, wherein the first thermal conductive layer is 0.05-0.3mm thick; and/or the thickness of the second heat-conducting layer is 0.05-0.3 mm.

6. The power battery pack according to any one of claims 1 to 5, wherein a heat insulation layer is arranged between two adjacent battery modules.

7. The power battery pack according to claim 6, wherein the heat insulating layer is provided on both sides of each battery module.

8. The power battery pack of claim 6, wherein a space is left between the side of the thermal insulation layer and the wall of the placement cavity.

9. The power battery pack of claim 6, wherein the thermal insulation layer is provided with a third thermal conductive layer on a side facing the battery module, and the third thermal conductive layer is connected with the separator.

10. The power battery pack of claim 9, wherein the third thermally conductive layer is made of a graphene material.