CN116417715A - Battery case and battery pack - Google Patents
Battery case and battery pack Download PDFInfo
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- CN116417715A CN116417715A CN202111677998.5A CN202111677998A CN116417715A CN 116417715 A CN116417715 A CN 116417715A CN 202111677998 A CN202111677998 A CN 202111677998A CN 116417715 A CN116417715 A CN 116417715A
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- 229920005989 resin Polymers 0.000 claims description 36
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
- H01M50/141—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against humidity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/197—Sealing members characterised by the material having a layered structure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery shell which comprises at least one resin-based composite material layer and at least one waterproof layer, wherein the resin-based composite material layer and the waterproof layer are mutually connected through hot pressing. The invention also discloses a battery pack, which comprises the battery shell.
Description
Technical Field
The invention relates to the field of new energy automobile batteries. More particularly, the present invention relates to a battery case for a battery of a new energy automobile, and a battery pack including the same.
Background
The existing battery case of the new energy automobile mainly adopts a mode that an aluminum alloy tray is combined with a battery cover formed by injection molding of engineering plastics, so that the weight of the battery is large, and the power consumption is high. Therefore, the light weight of the new energy automobile battery is always one of the main hot spots and difficulties of the modern automobile technology. In addition, although the existing batteries of the new energy automobiles all adopt a completely closed structure, the waterproof effect is still not satisfactory, so that the batteries have great potential safety hazards under the condition of being soaked in water. Particularly, in recent years, the condition that flood or waterlogging is caused by frequent occurrence of storm in China, and the condition that a new energy automobile is soaked in water for a long time, especially in rainwater, occurs. Since rainwater has stronger conductivity, once the battery leaks electricity, the safety problem caused by the leakage is not ignored.
CN 209786038U discloses an automobile battery with good waterproof effect, including battery body and battery case, the inner wall of battery case pastes there is first waterproof layer, the surface of battery body pastes there is the second waterproof layer, it has the water absorption layer to fill between first waterproof layer and the second waterproof layer. The invention combines a plurality of layers of waterproof materials and water absorbing materials, and has better waterproof performance, but has more complex structure, low productivity and difficult mass continuous production.
CN 212810424U discloses a waterproof explosion-proof ternary lithium battery, including group battery, insulating guard plate, water proof membrane and shell, insulating guard plate with the water proof membrane wraps up in proper order in the group battery outside, and is located inside the shell to annotate waterproof glue in the both ends outside of water proof membrane, and waterproof membrane with fill the silica gel layer between the shell. The invention also has the problem of complex structure. In addition, the use of the waterproof glue not only results in complex production process, but also may cause the problem of exceeding the standard of Total Volatile Organic Compounds (TVOC).
Therefore, there is still a need to develop a new battery pack that is lightweight, has excellent mechanical strength and good waterproof property with simple process to better meet the performance requirements of modern new energy automobiles.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a battery case having a simple structure, a light weight, excellent mechanical strength, and good waterproof effect, and a battery pack including the same.
The battery shell comprises at least one resin-based composite material layer and at least one waterproof layer, and the resin-based composite material layer and the waterproof layer are mutually bonded through hot pressing.
In some embodiments, the battery housing comprises at least two resin-based composite layers and at least one waterproof layer, and the waterproof layer is disposed between the two resin-based composite layers.
The invention also provides a battery pack, which comprises the battery shell and a battery arranged inside the battery shell.
Advantageous effects
The battery shell provided by the invention has the advantages of remarkable light weight effect, excellent mechanical strength, good waterproof effect and simple structure.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly described below. It is evident that the figures in the following description are only some embodiments of the invention, from which other embodiments can be obtained for a person skilled in the art without inventive effort.
Fig. 1 is a schematic view of a structure of a battery pack according to the related art.
Fig. 2 is a schematic structural view of a battery case of embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of a battery case of embodiment 2 of the present invention.
Fig. 4 is a schematic view showing the structure of the battery case of embodiment 1 of the present invention as an upper cover of a battery pack.
Fig. 5 is a schematic view showing the structure of the battery case of embodiment 2 of the present invention as an upper cover of a battery pack.
Fig. 6 is a schematic structural view of the battery case of embodiment 2 of the present invention used as both the upper and lower covers of the battery pack.
Wherein, the 1-resin matrix composite material layer and the 2-waterproof layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "inner", "outer", "upper", "lower", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the components or elements referred to must have a specific orientation or be configured in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "at least one layer" means one or more layers.
Referring to fig. 1, a schematic structure of a prior art battery pack 100 includes a battery case (110 and 110 '), which may serve as an upper cover 110 and a lower cover 110' of the battery pack 100, and the upper cover 110 and the lower cover 110' cooperate to form a space 120 for accommodating components (not shown) such as a battery or a battery module. In the present invention, the battery pack 100 includes, but is not limited to, a battery pack of a new energy automobile.
However, as described above, the case of the current battery pack has problems of being heavy, not waterproof, and/or complicated in production process.
In view of this, the present invention provides a battery case including at least one resin-based composite material layer and at least one waterproof layer, and the resin-based composite material layer and the waterproof layer are bonded to each other by hot pressing. The waterproof layer is arranged on one side of the resin matrix composite material layer, which is close to or far away from the battery.
The battery case of the invention has remarkable light weight effect, excellent mechanical strength and good waterproof effect and simple structure by using the resin-based composite material layer and the waterproof layer which are bonded by hot pressing.
In the present invention, the resin-based composite material layer and the waterproof layer are joined to each other by hot pressing, thereby forming an integrally molded structure. The hot pressing utilizes the bonding property of the resin in the resin matrix composite material to bond, so that no additional adhesive is needed, the sizing step is omitted, and the process is simple.
In the invention, the number of layers of the resin matrix composite material layer and the waterproof layer is not particularly limited, and a person skilled in the art can select a proper number of layers according to actual needs. For example, in some embodiments, the number of layers of the resin-based composite material layer and the waterproof layer is each 1 to 4, such as 1, 2, 3, or 4. Preferably, the number of resin-based composite layers is 1 to 3, for example 1, 2 or 3. Preferably, the number of layers of the waterproof layer is 1 to 3, for example 1, 2 or 3.
In a preferred embodiment of the present invention, the resin-based composite material layers and the waterproof layer are alternately arranged. The resin-based composite material layer and the waterproof layer which are arranged in the way enable the battery shell to have the advantages of excellent mechanical strength, good waterproof property and light weight.
In the present invention, when referring to the word "alternating", it means that in the battery case, only the resin-based composite material layer is joined to the waterproof layer, and only the waterproof layer is joined to the resin-based composite material layer. Thus, the battery case of the present invention means that there are no two waterproof layers bonded to each other, nor two resin-based composite layers bonded to each other, by using the word "alternating". In particular, when the battery case includes only one resin-based composite layer and one waterproof layer, "alternating" means that one resin-based composite layer and one waterproof layer are joined.
In a preferred embodiment of the present invention, the waterproof layer is provided at a side of the resin-based composite material layer adjacent to the battery. Therefore, the outermost layer of the battery shell far away from the battery is a resin-based composite material layer, and when the battery shell is acted by external force, the resin-based composite material layer positioned on the outermost layer can play a role in damping, so that the problem that the waterproof layer is damaged to influence the final waterproof effect is avoided. In addition, the arrangement can also prevent the waterproof layer from being exposed to the outside of the battery case due to wrinkles generated in the hot pressing process, thereby improving the aesthetic appearance of the battery case member.
In one embodiment of the invention, the battery housing comprises at least two resin-based composite material layers and at least one waterproof layer, and the waterproof layer is arranged between the two resin-based composite material layers. Therefore, the outermost layer of the battery shell far away from the battery and the innermost layer close to the battery are both resin-based composite material layers, so that the waterproof layer can be better protected. Meanwhile, the waterproof layer can be prevented from being exposed to the outside of the battery shell due to the wrinkles generated in the hot pressing process, and the overall attractiveness of the battery shell part is improved. In addition, through setting up two-layer resin matrix composite material layer, can also further strengthen the mechanical strength of battery case.
In one embodiment, the resin-based composite material layer is a resin-based porous material layer. The resin-based porous material is a material known in the art, and includes a porous material and a resin surrounding the porous material. In the resin-based porous material, resin is filled in gaps or pores of the porous material, or the porous material is impregnated with resin.
In addition, the resin and the porous material in the resin-based porous material are also known in the art.
In a preferred embodiment, the resin-based porous material layer has a porous structure. Preferably, the cellular structure originates from cells of the resin in the resin-based porous material layer resulting from foaming. The formation of cell structures as a result of foaming of the resin is known to those skilled in the art. Thus, in some embodiments, the resin-based porous material layer, in particular its cross-section, has a cellular structure resembling cells.
In the present invention, the "cells" refer to the smallest structural units constituting the single small cells of the foamed resin, which are formed by a foaming agent, mechanically introduced gas, dissolution of soluble substances, or the like, when the resin is foamed. The foaming includes, for example, physical foaming and chemical foaming. The physical foaming means foaming by vaporization of a physical foaming agent, and the chemical foaming means foaming by a gas (e.g., carbon dioxide) generated by a chemical reaction of a chemical foaming agent such as water with isocyanate. Methods of forming cells are known to those skilled in the art.
In some embodiments, the resin in the resin-based porous material layer comprises polyurethane or polyurea, epoxy, or unsaturated resin; preferably, the resin is a polyurethane resin. In some embodiments, the resin is a foamed resin, such as a foamed polyurethane resin. The battery case can be further lightened by using the foamed resin. In some embodiments, the resin has a density of 100 to 1200g/L, preferably 100 to 500g/L.
In some embodiments, the porous material in the resin-based porous material layer has a weight of 100 to 2400g/m 2 Is a single layer areal density of (c). In the present invention, the "single-layer areal density" refers to the mass per unit area in a porous material in which a resin-based porous material layer is formed; methods for testing thereof are known to those skilled in the art.
As known in the art, the porous material is also referred to as a reinforcing material. By way of example, the porous materials include fibrous materials such as Glass Fibers (GF), carbon fibers, natural fibers (e.g., bamboo fibers), particularly in the form of cloth, as well as nonwoven fabrics, and perforated (penetrating or non-penetrating) sheet materials such as perforated metal sheets, wood sheets and plastic sheets such as foamed aluminum, honeycomb sheets. In a preferred embodiment, the porous material is a fibrous reinforcement, in particular Glass Fiber (GF). Preferably, the porous material is a glass fiber material in the form of a felt, such as a glass fiber felt.
In some embodiments, the waterproof layer comprises a metal sheet or a plastic sheet as known in the art. Preferably, the metal sheet is selected from the group consisting of aluminum alloy, iron, steel and aluminum. Preferably, the plastic sheet is selected from at least one of the following materials: polyethylene (PE), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polypropylene (PP), thermoplastic Polyurethane (TPU), polyurethane (PU), polyamide (PA), polyvinyl butyral (PVB) and ethylene vinyl acetate copolymer (EVA). In a preferred embodiment, the plastic sheet is selected from Polyurethane (PU), more preferably Thermoplastic Polyurethane (TPU).
In the present invention, the thickness of the waterproof layer is 0.01 to 1mm, preferably 0.02 to 0.3mm. The thickness in the range ensures, on the one hand, good adhesion between the layers when the resin-based composite material layer and the waterproof layer are integrally formed by hot pressing, and, on the other hand, excellent physical properties, particularly waterproof properties, of the obtained battery case.
The thickness of the battery case of the present invention is 1.0 to 50mm, preferably 1.0 to 10mm. In addition, the overall density of the battery case is 0.5-2.7g/cm 3 Preferably 1.1-1.8g/cm 3 . Therefore, the battery case of the present invention has a remarkable light-weight effect. The term "bulk density" as used herein refers to the ratio of the total mass of the battery case itself to the total volume; it was determined by GB/T1033.1-2008.
The invention also provides a battery pack comprising the battery shell and a battery inside the battery shell.
In one embodiment of the invention, the battery housing is an upper cover and/or a lower cover of a battery pack. Preferably, the upper and lower covers of the battery pack are connected by means known in the art, such as by bolting. The upper cover and the lower cover cooperate to form a space for placing a battery.
In a preferred embodiment, the battery housing has a shape adapted to a battery.
Specific embodiments of the present invention are described below with reference to examples, but it should be understood that the present invention is not limited to these specific embodiments.
Test method
Overall density: GB/T1033.1-2008
Tensile strength: GB/T1447-2005
Waterproof property: GB 38031-2020
Preparation of battery case
Example 1
Fig. 2 illustrates a battery case of embodiment 1 of the present invention. As shown in fig. 2, the battery case has a two-layer structure, specifically, it includes a resin-based composite material layer 1 and a waterproof layer 2. The waterproof layer 2 is located on the side of the resin-based composite material layer 1 close to the battery (not shown).
The battery case of the present embodiment is prepared by the steps of: step 1), firstly spraying polyurethane resin materials on two sides (one side can also be used) of a glass fiber felt through a spray head; step 2) placing a waterproof layer made of thermoplastic polyurethane TPU into a mold, and placing the uncured resin-based glass fiber felt obtained in the step 1) on the surface of the waterproof layer; and 3) clamping the upper die and the lower die, and then performing hot pressing and curing integrated molding.
In the present embodiment, the thickness of the waterproof layer 2 is 0.05mm, and the thickness of the battery case is 1.6mm. The overall density of the obtained battery case was 1.5g/cm 3 The tensile strength was 165MPa. Therefore, the battery case of the present invention has not only a remarkable light weight effect but also excellent mechanical strength.
Example 2
Fig. 3 illustrates a battery case of embodiment 2 of the present invention. As shown in fig. 3, the battery case has a three-layer structure, and specifically includes two resin-based composite material layers 1 and a waterproof layer 2. The waterproof layer 2 is positioned between the two resin-based composite material layers 1. The two resin-based composite material layers 1 and the waterproof layer 2 are bonded by hot pressing.
The battery case of the present embodiment is prepared by the steps of: step 1) providing two layers of glass fiber mats; step 2) putting a waterproof layer made of thermoplastic polyurethane TPU between the two layers of glass fiber mats; step 3) respectively spraying polyurethane resin materials on the surfaces of the two layers of glass fiber mats through spray heads; and 4) clamping the upper die and the lower die, and then performing hot pressing and curing integrated molding.
In the present embodiment, the thickness of the waterproof layer 2 is 0.05mm, and the thickness of the battery case is 1.3mm. The overall density of the obtained battery case was 1.7g/cm 3 The tensile strength was 223MPa. Therefore, the battery case of the present invention has not only a remarkable light weight effect but also excellent mechanical strength.
Preparation of battery pack and waterproof test
Fig. 4 illustrates that the battery case of embodiment 1 of the present invention is an upper cover of a battery pack. Fig. 5 illustrates that the battery case of embodiment 2 of the present invention is an upper cover of a battery pack. Fig. 6 illustrates the battery case of embodiment 2 of the present invention as both the upper and lower covers of the battery pack. The upper cover and the lower cover of the battery pack are connected through bolts. The upper and lower covers cooperate to form a space for the placement of a battery (not shown).
The waterproof property test was performed on the battery packs shown in fig. 4 to 6 described above according to GB 38031-2020, respectively. The battery pack was placed in a pool 3 having a water depth of 1.5m for 30 minutes, no bubbles were observed to be generated, and water did not leak into the battery pack. After 1 hour, no bubbles were generated, and no water leakage occurred.
It should be noted that, although the waterproof layer 2 is disposed on the side of the resin-based composite layer 1 close to the battery in the battery case shown in fig. 4, it should be understood by those skilled in the art that the battery case also has excellent waterproof performance when the waterproof layer 2 is disposed on the side of the resin-based composite layer 1 remote from the battery.
The above results show that the battery case of the invention not only has remarkable light weight effect, but also has excellent mechanical strength and excellent waterproof performance, and the manufacturing process is simple.
The foregoing has described the basic principles and exemplary embodiments of the present invention. It will be appreciated by persons skilled in the art that the above description is only for the purpose of illustrating the invention and that the invention is not limited by the embodiments described above. The present invention is capable of various changes and modifications without departing from the spirit and scope of the invention, and all such changes and modifications fall within the scope of the invention as hereinafter claimed.
Claims (16)
1. The battery shell is characterized by comprising at least one resin-based composite material layer (1) and at least one waterproof layer (2), wherein the resin-based composite material layer (1) and the waterproof layer (2) are mutually jointed through hot pressing.
2. The battery case according to claim 1, wherein the number of layers of the resin-based composite material layer (1) and the waterproof layer (2) is each 1 to 4.
3. Battery housing according to claim 1 or 2, characterized in that the resin-based composite material layer (1) and the waterproof layer (2) are alternately arranged.
4. Battery housing according to claim 1 or 2, characterized in that the waterproof layer (2) is arranged on the side of the resin-based composite layer (1) close to the battery.
5. The battery housing according to claim 1, characterized in that the battery housing comprises at least two resin-based composite layers (1) and at least one waterproof layer (2), and the waterproof layer (2) is arranged between the two resin-based composite layers (1).
6. The battery case according to claim 1 or 5, characterized in that the resin-based composite material layer (1) is a resin-based porous material layer comprising a porous material and a resin surrounding the porous material.
7. The battery housing of claim 6, wherein the resin-based porous material layer has a porous structure.
8. The battery housing of claim 6, wherein the resin is polyurethane, polyurea, or epoxy; the porous material is glass fiber, carbon fiber, natural fiber or metal plate, wood plate and plastic plate with holes.
9. The battery case according to claim 6, wherein the porous material has a single-layer areal density of 100 to 2400g/m 2 。
10. Battery housing according to claim 1 or 5, characterized in that the waterproof layer (2) comprises a metal sheet or a plastic sheet.
11. The battery housing of claim 10, wherein the metal sheet is selected from the group consisting of aluminum alloy, iron, steel, and aluminum, and the plastic sheet is selected from the group consisting of polyethylene PE, polyvinyl chloride PVC, polyethylene terephthalate PET, polybutylene terephthalate PBT, polypropylene PP, polyurethane PU, polyamide PA, polyvinyl butyral PVB, and ethylene-vinyl acetate copolymer EVA.
12. The battery housing of claim 11, wherein the plastic sheet is a thermoplastic polyurethane TPU.
13. The battery case according to claim 1 or 5, wherein the waterproof layer (2) has a thickness of 0.01mm to 1mm.
14. The battery housing of claim 1 or 5, wherein the thickness of the battery housing is 1.0mm to 50mm.
15. A battery pack, comprising
The battery case according to any one of claims 1 to 14; and
and a battery disposed inside the battery case.
16. The battery pack of claim 15, wherein the battery housing is an upper and/or lower lid of the battery pack.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111677998.5A CN116417715A (en) | 2021-12-31 | 2021-12-31 | Battery case and battery pack |
| PCT/EP2022/087159 WO2023126266A1 (en) | 2021-12-31 | 2022-12-21 | Battery case and battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111677998.5A CN116417715A (en) | 2021-12-31 | 2021-12-31 | Battery case and battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116417715A true CN116417715A (en) | 2023-07-11 |
Family
ID=87058547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111677998.5A Pending CN116417715A (en) | 2021-12-31 | 2021-12-31 | Battery case and battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116417715A (en) |
-
2021
- 2021-12-31 CN CN202111677998.5A patent/CN116417715A/en active Pending
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