CN116845449A - Battery pack, manufacturing method thereof and electric equipment - Google Patents
Battery pack, manufacturing method thereof and electric equipment Download PDFInfo
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- CN116845449A CN116845449A CN202310484430.4A CN202310484430A CN116845449A CN 116845449 A CN116845449 A CN 116845449A CN 202310484430 A CN202310484430 A CN 202310484430A CN 116845449 A CN116845449 A CN 116845449A
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- separator
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- insulating layer
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000005192 partition Methods 0.000 claims abstract description 75
- 238000001746 injection moulding Methods 0.000 claims abstract description 27
- 239000003792 electrolyte Substances 0.000 claims abstract description 22
- 239000000243 solution Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 239000012778 molding material Substances 0.000 claims description 6
- 239000012670 alkaline solution Substances 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000975 Carbon steel Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 239000010962 carbon steel Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 7
- 238000002955 isolation Methods 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 43
- 125000006850 spacer group Chemical group 0.000 description 9
- 238000009413 insulation Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000013011 mating Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000014653 Carica parviflora Nutrition 0.000 description 1
- 241000243321 Cnidaria Species 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application provides a battery pack, a manufacturing method thereof and electric equipment, and relates to the technical field of batteries. The battery pack comprises a battery box, a plurality of bare cells, electrolyte and a plurality of cell cover plates. The battery box comprises a box body with an opening at one end and a baffle plate assembly arranged in the box body, wherein the baffle plate assembly forms a plurality of chambers with openings in the box body, and the inner surface of each chamber is covered with an insulating layer so as to separate the chambers from each other, and the insulating layer is formed through a nano injection molding process. The bare cells are arranged in the chambers in a one-to-one correspondence manner, electrolyte is filled in each chamber, and the battery cell cover plates are arranged at the openings of the chambers in a one-to-one correspondence manner. The battery box provided by the application omits a plurality of independent battery cell shells, realizes the isolation between bare battery cells through the partition plate assembly, and improves the integration level of the whole battery pack. The insulating layer formed by the nano injection molding process can play a good insulating role and has reliable stability.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a battery pack, a manufacturing method thereof and electric equipment.
Background
At present, the conventional structure of the existing battery pack comprises a box body and a plurality of battery modules arranged in the box body, wherein the battery modules are integrated with a plurality of battery monomers, or in the CTP structure, the battery pack comprises the box body and a plurality of battery monomers arranged in the box body, whether the conventional structure or the CTP structure is adopted, each battery monomer is provided with an independent battery shell, and a winding core and electrolyte are arranged in the battery shell. Because the battery shell needs to occupy certain space, a large number of battery shells are arranged in the existing battery pack, so that the integration level is poor, and the overall energy density of the battery pack is influenced.
Disclosure of Invention
The application aims at providing a battery pack, a manufacturing method thereof and electric equipment, wherein the battery pack has high integration level.
Embodiments of the application may be implemented as follows:
in a first aspect, the present application provides a battery pack comprising:
the battery box comprises a box body with an opening at one end and a baffle plate assembly arranged in the box body, wherein the baffle plate assembly forms a plurality of chambers with openings in the box body, and the inner surface of each chamber is covered with an insulating layer formed by nano injection molding in an integrated manner so as to isolate the chambers from each other;
the bare cells are arranged in the cavities in a one-to-one correspondence manner;
electrolyte filled in each chamber;
the battery cell cover plates are arranged at the openings of the chambers in a one-to-one correspondence mode.
In an alternative embodiment, the baffle assembly includes a plurality of first baffles and a plurality of second baffles arranged in a staggered manner, the first baffles extending in a first direction and the second baffles extending in a second direction, the first direction being perpendicular to the second direction.
In an alternative embodiment, the battery box comprises a bottom plate and a frame arranged on the bottom plate, a plurality of first clamping grooves and a plurality of second clamping grooves are arranged on the frame, two ends of the first partition board are respectively inserted into the two first clamping grooves, and two ends of the second partition board are respectively inserted into the two second clamping grooves.
In an alternative embodiment, the frame comprises two first side plates and two second side plates, the two first side plates are arranged at intervals in the first direction, the two second side plates are arranged at intervals in the second direction, the first clamping groove is formed in the first side plates, the second clamping groove is formed in the second side plates, two ends of the first partition plate are respectively matched with the first clamping grooves in the two first side plates in a plugging mode, and two ends of the second partition plate are respectively matched with the second clamping grooves in the two second side plates in a plugging mode.
In an alternative embodiment, the thickness of the first partition is smaller than the width of the first clamping groove, and a gap between the first partition and the side wall of the first clamping groove is filled with a first filling part;
the thickness of the second partition plate is smaller than the width of the second clamping groove, and a second filling part is filled in a gap between the second partition plate and the side wall of the second clamping groove;
the first filling part, the second filling part and the insulating layer are integrally formed through a nano injection molding process.
In an alternative embodiment, the first clamping groove is provided with first bosses respectively protruding on two opposite side wall surfaces in the width direction, and the first bosses are abutted against the first partition plate;
and second bosses are respectively arranged on two opposite side wall surfaces of the second clamping groove in the width direction in a protruding mode, and the second bosses are abutted against the second partition plate.
In an alternative embodiment, at least one of the first and second partitions is provided with a mating groove through which the first and second partitions are inserted into engagement.
In an alternative embodiment, the ratio of the thickness of the first and second spacers to the thickness of the insulating layer is 1 to 2, and the thickness of the first and second spacers is 0.5 to 1mm.
In an alternative embodiment, the thickness of the first separator is 1 to 1.5 times that of the second separator, and the extending direction of the first separator is parallel to the plane direction of the bare cell.
In an alternative embodiment, a gap is formed between the partition board assembly and the bottom board, a third filling part is filled in the gap between the partition board assembly and the bottom board to isolate each cavity, and the third filling part and the insulating layer are integrally formed through a nano injection molding process.
In alternative embodiments, the material of the box and the diaphragm assembly is an aluminum alloy, stainless steel, carbon steel or magnesium alloy, and/or the material of the insulating layer includes PPS, PBT or PA.
In an alternative embodiment, the material of the insulating layer further comprises 10 to 35wt.% glass fibers, the insulating layer has a thermal conductivity of less than or equal to 0.20W/m·k, and the insulating layer has a thickness of 0.01 to 1mm.
In a second aspect, the present application provides a method for manufacturing a battery pack, including:
inserting a baffle assembly into a box body with an opening at one end to form a plurality of chambers with openings;
etching the inner surface of the chamber;
placing a die in the cavity, and reserving a gap between the die and the inner surface of the cavity;
injecting nano injection molding materials into a gap between the mold and the inner surface of the cavity, forming an insulating layer attached to the inner surface of the cavity after the nano injection molding materials are cooled, and removing the mold;
and a bare cell is placed in the cavity, a cell top cover is arranged at the opening of the cavity, and electrolyte is injected into the cavity.
In an alternative embodiment, the step of etching the inner surface of the chamber comprises:
the inner surface of the chamber is sequentially soaked in an alkaline solution, a first acid solution and a second acid solution, wherein the acidity of the first acid solution is stronger than that of the second acid solution.
In a third aspect, the present application provides an electric device, including a battery pack provided in any one of the embodiments of the first aspect, or including a battery pack manufactured by the manufacturing method provided in any one of the embodiments of the second aspect.
The beneficial effects of the embodiment of the application include, for example:
the battery pack comprises a battery box, a plurality of bare cells, electrolyte and a plurality of cell cover plates. The battery box comprises a box body with an opening at one end and a baffle plate assembly arranged in the box body, wherein the baffle plate assembly forms a plurality of chambers with openings in the box body, and the inner surface of each chamber is covered with an insulating layer so as to separate the chambers from each other, and the insulating layer is formed through a nano injection molding process. The bare cells are arranged in the chambers in a one-to-one correspondence manner, electrolyte is filled in each chamber, and the battery cell cover plates are arranged at the openings of the chambers in a one-to-one correspondence manner. According to the battery box provided by the application, the battery shell is omitted, the bare cells are isolated through the partition plate assembly, the integration level of the whole battery pack is improved, the internal structural assembly of the battery pack is reduced, the production efficiency is improved, and meanwhile, the volume utilization rate can be improved, so that the whole energy density of the battery is improved. The insulating layer formed by the nano injection molding process can play a good insulating role and has reliable stability.
The manufacturing method of the battery pack is used for manufacturing the battery pack. The electric equipment provided by the application comprises the battery pack, so that the electric equipment also has the corresponding beneficial effects.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a battery pack according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a battery box according to an embodiment of the application;
FIG. 3 is a schematic view of a case according to an embodiment of the present application;
FIG. 4 is a schematic illustration of the cooperation of a first separator plate and a second separator plate in an embodiment of the application;
FIG. 5 is an enlarged view of the portion V of FIG. 2;
FIG. 6 is a cross-sectional view of a tank in one embodiment of the application;
fig. 7 is an enlarged view of a portion VI in fig. 6.
Icon: 010-battery pack; 100-battery box; 101-a chamber; 110-a box body; 111-a first side plate; 112-a first card slot; 1121-a first boss; 113-a second side panel; 114-a second card slot; 115-a bottom plate; 120-separator plate assembly; 121-a first separator; 122-a first mating groove; 123-a second separator; 124-a second mating groove; 130-an insulating layer; 131-a first filling part; 132-a third filling portion; 200-bare cell; 300-cell cover plate.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, if the terms "upper", "lower", "inner", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, or the azimuth or the positional relationship in which the inventive product is conventionally put in use, it is merely for convenience of describing the present application and simplifying the description, and it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus it should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, if any, are used merely for distinguishing between descriptions and not for indicating or implying a relative importance.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
Currently, a common CTP battery pack includes a case and a plurality of battery cells disposed in the case, each battery cell having an independent battery case with a winding core (i.e., a bare cell) and an electrolyte inside the battery case. Because the battery shell needs to occupy certain space, set up a large amount of battery shells in the current battery package, consequently its integrated level is relatively poor, and inner structure subassembly includes end plate and curb plate etc. and the structure is complicated, is unfavorable for production, and inner structure subassembly's increase simultaneously leads to the volume utilization to descend to the whole energy density of battery has been influenced. If the case of the battery pack is provided with a separator assembly to divide the inner cavity of the case into a plurality of chambers in which the winding core and the electrolyte are put, the use of the battery case can be omitted. However, if the separator is welded to the bottom plate and the side plates of the case, welding scraps are welded, and the welding scraps are in contact with the bare cell, which can adversely affect the performance of the battery. If the shell is integrally formed into a plurality of cavities, such as cast aluminum, the thickness of the baffle plate is required to be thicker than 5mm due to the limitation of the process, and the drawing slope is required to be set due to the demolding problem, so that the standard square cavity cannot be generated, and the space waste is easy to cause. At the same time, each cavity also needs to be insulated, otherwise a conductive short circuit occurs between the cells, which results in a smaller volume utilization.
In order to improve at least one of the above-mentioned shortcomings in the prior art, an embodiment of the present application provides a battery pack based on a nano injection molding process. In addition, the embodiment of the application also provides a manufacturing method of the battery pack and electric equipment comprising the battery pack.
Fig. 1 is a schematic diagram of a battery pack 010 according to an embodiment of the present application; fig. 2 is a schematic view of a battery box 100 according to an embodiment of the application. Referring to fig. 1 and 2, the battery pack 010 provided in the present embodiment includes a battery case 100, a plurality of bare cells 200, an electrolyte, and a plurality of cell cover plates 300. The battery case 100 includes a case body 110 having an opening at one end and a partition plate assembly 120 disposed in the case body 110, the partition plate assembly 120 forming a plurality of chambers 101 having openings in the case body 110. The bare cells 200 are arranged in the chambers 101 in a one-to-one correspondence manner, electrolyte is filled in each chamber 101, and the cell cover plates 300 are arranged at the openings of the chambers 101 in a one-to-one correspondence manner. The cell cover plate 300 is provided with a liquid injection port for injecting electrolyte, so that after the bare cell 200 is placed in the cavity 101 and the cell cover plate 300 is fixed, the electrolyte is injected into the cavity 101 to realize electrochemical reaction. The cell cover 300 may be connected to the separator assembly 120 by laser welding, bonding, or the like, and the cell cover 300 located at the edge of the battery case 100 adjacent to the case 110 may also be connected to the case 110 to improve the sealability of the chamber 101. It should be noted that the bare cell 200 may include a plurality of cells, that is, a plurality of cells may be disposed in each chamber 101 to meet the design requirement, for example, 1, 2, 3, or 4 cells may be disposed in each chamber 101, and the application is not limited thereto, and in a preferred embodiment, the number of cells in each chamber is consistent to improve the consistency of the batteries in the battery pack 010.
FIG. 3 is a schematic diagram of a case 110 according to an embodiment of the application; fig. 4 is a schematic view showing the cooperation of the first separator 121 and the second separator 123 in an embodiment of the present application. Referring to fig. 2 to 4, in an embodiment, the case 110 of the battery case 100 includes a base plate 115 and a frame disposed on the base plate 115, and the base plate 115 and the frame together define a cavity for accommodating the separator assembly 120, the bare cell 200, and the electrolyte. The inner side wall of the frame is provided with a clamping groove for limiting the baffle assembly 120. Specifically, the frame includes two first side plates 111 and two second side plates 113, the two first side plates 111 are disposed at intervals in a first direction, and the two second side plates 113 are disposed at intervals in a second direction, so as to enclose a rectangular cavity, and the first direction is perpendicular to the second direction. The first side plate 111 has a first engaging groove 112 on an inner wall surface thereof, and the second side plate 113 has a second engaging groove 114 on an inner wall surface thereof.
The partition plate assembly 120 includes a plurality of first partition plates 121 and a plurality of second partition plates 123 disposed alternately, the first partition plates 121 extending in a first direction, and the second partition plates 123 extending in a second direction. Two ends of the first partition plate 121 are respectively inserted into two first clamping grooves 112 of two opposite first side plates 111, and two ends of the second partition plate 123 are respectively inserted into two second clamping grooves 114 of two opposite second side plates 113. The number of the first clamping grooves 112 on the first side plate 111 should be matched with the number of the first partition plates 121, and the interval distances should be equal; the number of second card slots 114 on the second side plate 113 should be matched with the number of second partition plates 123, and the interval distances should be equal. That is, the first side plates 111, the first clamping grooves 112 are uniformly spaced, the distances between the adjacent first partition plates 121 and between the first partition plates 121 adjacent to the frame and the frame of the case are equal, and the second clamping grooves 114 are uniformly spaced on the second side plates 113 so that the distances between the adjacent second partition plates 123 and between the second partition plates 123 adjacent to the frame and the frame of the case are the same in the first direction and the second direction, so that the volumes of each formed chamber 101 are equal, and the consistency of the battery units formed by the respective chambers 101 in the battery pack 010 is ensured. The extending direction of the first clamping groove 112 and the second clamping groove 114 is the thickness direction of the box body 110, so that the first partition plate 121 and the second partition plate 123 can be conveniently inserted and connected, and the production efficiency is improved.
Optionally, at least one of the first and second partitions 121 and 123 is provided with a fitting groove, through which the first and second partitions 121 and 123 are inserted and fitted. In this embodiment, the first partition plate 121 is provided with a first matching groove 122, the second partition plate 123 is provided with a second matching groove 124, the opening of the first matching groove 122 is downward, the opening of the second matching groove 124 is upward, the first matching groove 122 and the second matching groove 124 are mutually inserted, when the first matching groove and the second matching groove are inserted in place, the bottom of the first matching groove 122 is abutted against the bottom of the second matching groove 124, and the tops of the first partition plate 121 and the second partition plate 123 are flush. In this embodiment, the first partition plate 121 and the second partition plate 123 are in plug-in fit, so that the cavity of the box body 110 is divided into a plurality of chambers 101, and compared with the case that each chamber 101 is formed by independently using a small partition plate for splicing or using a battery case, the number of components of the partition plate assembly 120 is greatly reduced, the assembly efficiency is improved, and the volume utilization rate is also improved.
Alternatively, the thicknesses of the first separator 121 and the second separator 123 are 0.5-1mm, and further, the thicknesses of the first separator 121 and the second separator 123 are 0.6-0.9 mm, and the thicknesses of the separators can be set according to actual needs so as to meet the rigidity requirement.
Alternatively, the thickness of the first spacer 121 is 1 to 1.5 times the thickness of the second spacer 123, wherein the extending direction of the first spacer 121 is parallel to the plane direction of the bare cell 200. For square battery, the bare cell 200 is formed by winding a plane and a winding surface, the area of the plane is larger than that of the winding surface, and the bare cell 200 is easy to collide at the plane position in the use process, namely, the bare cell 200 expands in the second direction of the chamber 101, so that the first separator 121 is thicker than the second separator 123, which is beneficial to preventing the deformation of the battery pack 010. The thickness of the first separator 121 and the second separator 123 may be set according to the actual expansion condition, as long as the thickness of the first separator 121 is greater than that of the second separator 123 and deformation can be effectively prevented.
Fig. 5 is an enlarged view of a portion V in fig. 2. As shown in fig. 5, in the embodiment of the present application, the inner surface of each chamber 101 is covered with a nano injection molded integrally formed insulating layer 130 to isolate the respective chambers 101 from each other. Alternatively, the thickness of the insulating layer 130 is 0.1 to 1mm, and further, the thickness of the insulating layer 130 is 0.2 to 0.9mm. Through the mode of nanometer injection molding, can form the insulating layer 130 that covers whole cavity 101 in cavity 101, not only play sealed effect, still play insulating effect, as long as one shot forming can, the production of being convenient for, simultaneously, insulating layer 130 still has the heat preservation effect, realizes the temperature isolation between the cavity 101, can replace the heat insulating pad between the battery among the prior art, simplifies overall structure, improves whole integrated level.
In the present embodiment, the thickness of the first spacer 121 is smaller than the width of the first clamping groove 112, and the gap between the first spacer 121 and the sidewall of the first clamping groove 112 is filled with the first filling portion 131; the thickness of the second partition 123 is smaller than the width of the second card slot 114, and a gap between the second partition 123 and the side wall of the second card slot 114 is filled with a second filling portion (not shown in the drawing). The first filling portion 131, the second filling portion and the insulating layer 130 are integrally formed through a nano injection molding process. It should be understood that the materials of the first filling portion 131, the second filling portion, and the insulating layer 130 are the same, and they are simultaneously molded by the nano injection molding process using the same raw materials. The insulating layer 130 can provide isolation to prevent the electrolyte, bare cell 200, from contacting the case 110 and the separator assembly 120. The thickness of the first partition plate 121 is smaller than the width of the first clamping groove 112, the thickness of the second partition plate 123 is smaller than the width of the second clamping groove 114, the first partition plate 121 and the second partition plate 123 are convenient to plug in, production efficiency is improved, the installation gap of the partition plate assembly 120 is filled through the first filling part 131 and the second filling part, the whole structure is firmer, electrolyte is not easy to leak, the cavity 101 and the frame are isolated, and the sealing performance of the cavity 101 is improved.
Further, as shown in fig. 5, first bosses 1121 are respectively protruded on two opposite side wall surfaces of the first clamping groove 112 in the width direction, and the first bosses 1121 are abutted against the first partition 121. Since the width of the first clamping groove 112 is larger than the thickness of the first partition plate 121, if the first partition plate 121 is not located at the center of the first clamping groove 112, the adjacent two chambers 101 are different in size, which is disadvantageous for uniformity of each battery, and thus capacity loss and life loss are caused. By providing the first bosses 1121 on both side walls of the first card slot 112, the first separator 121 can be restrained so as to be centered.
Further, the first bosses 1121 on two opposite sidewalls of the first slot 112 may be symmetrically disposed, so as to ensure that the first partition 121 may be centered; in an alternative embodiment, the first boss 1121 may be made of a resilient material, such as a rubber block, so as to avoid the difficulty in inserting the first partition 121 due to manufacturing process errors, and further, to improve the applicability of the first slot 112, so as to avoid the inability to insert due to the variation of the thickness of the first partition 121; alternatively, the first boss 1121 may be integrally formed with the first side plate 111. The first boss 1121 may be a bar-shaped boss extending in the longitudinal direction of the first card slot 112 (the height direction of the battery case), or may be a plurality of bosses spaced in this direction. In order to improve the clamping force of the first clamping groove 112 on the first partition plate 121, the first boss 1121 can cover the whole side wall of the first clamping groove 112, so that the contact area between the first boss 1121 and the first partition plate 121 is ensured, and the clamping force is improved.
Similarly, the second clamping groove 114 is provided with second bosses protruding from two opposite side wall surfaces in the width direction, and the second bosses are abutted against the second partition 123. The second boss is disposed in a manner and functions in a manner similar to the first boss 1121, and will not be described again here.
FIG. 6 is a cross-sectional view of a housing 110 in one embodiment of the application; fig. 7 is an enlarged view of a portion VI in fig. 6. As shown in fig. 6 and 7, in the present embodiment, a gap is formed between the partition board assembly 120 and the bottom board 115, and a third filling portion 132 is filled in the gap between the partition board assembly 120 and the bottom board 115 to isolate the respective chambers 101 from each other, and the third filling portion 132 and the insulating layer 130 are integrally formed by a nano injection molding process. It should be understood that the materials of the third filling portion 132 and the insulating layer 130 are the same, and they are simultaneously formed by a nano injection molding process using the same raw materials. In the present embodiment, the bottom of the second partition 123 of the partition assembly 120 abuts against the bottom plate 115, the first partition 121 is supported by the second partition 123 and does not abut against the bottom plate 115, a gap is reserved between the lower end of the second partition 123 and the bottom plate 115, and the third filling portion 132 fills the gap.
Thanks to the molding mode of the nano injection molding process, the third filling part 132 is formed in the gap between the baffle assembly 120 and the bottom plate 115, the combination of the baffle assembly 120 and the box 110 is more stable, and each chamber 101 can be completely isolated, so that the sealing performance of the chamber 101 is improved.
Further, the materials of the case 110 and the partition plate assembly 120 may be selected from aluminum alloy, stainless steel, carbon steel or magnesium alloy; the material of the insulating layer 130 includes PPS, PBT, or PA. Further, the material of the insulating layer 130 further comprises 10-35 wt.% of glass fiber, and by adding a certain content of glass fiber, the thermal expansion coefficient of the insulating layer 130 can be close to or equal to that of the separator assembly 120 and the box 110, so that the bonding stability of the insulating layer 130, the box 110 and the separator assembly 120 is improved. In the application, the heat conductivity coefficient of the insulating layer 130 is less than or equal to 0.20W/m.K, and the insulating layer has good heat insulation performance, and can replace a spacing material between batteries in the prior art, thereby reducing the whole space occupation.
In the embodiment of the application, the box body 110 is divided into a plurality of chambers 101 with uniform volume by the plurality of first partition plates 121 and the plurality of second partition plates 123, the insulating layer 130 is arranged in the chambers 101 to replace a battery shell and a battery shell insulating film and a heat insulation pad between batteries in the prior art, so that the integral integration of the battery box 100 is improved, each battery is not required to be coated with the insulating film, the heat insulation pads are not required to be arranged between the batteries and then are assembled in the battery box 100 in groups, and a plurality of batteries are not required to be arranged in the battery box by structural members such as end plates and side plates, so that the grouping efficiency can be remarkably improved, meanwhile, the structural members are reduced, and the integral volume utilization rate is also improved.
For example, in the battery pack with CTP structure in the prior art, after the battery shell is generally 0.6-0.8mm, the battery shell is coated with an insulating film of 0.1-0.3mm, the battery is provided with a heat insulation pad of 3-4mm to play a role in heat insulation, and when the battery is assembled, a large number of structural members such as end plates, side plates and the like are also arranged, the thickness of the end plates is generally 15-25mm, and the thickness of the side plates is 2-3mm. In the present application, however, the thickness of the separator assembly 120 is 0.5-1mm and the thickness of the insulating layer 130 is 0.1-1mm. Assuming that the internal space of the battery is consistent, the length is 100mm, the width is 50mm, and under the condition of consistent height, the thickness of the separator is 1mm at the maximum, the thickness of the insulating layer 130 is 1mm at the maximum, and the area occupied by a single battery is as follows: (100+1×2+1) ×50+1×2+1) =5459 mm 2 In the prior art, the minimum value of the battery shell is 0.6mm, the minimum value of the insulating film is 0.1mm, the minimum value of the insulating pad arranged on the length square of the battery is 3mm, and the batteryThe minimum 2mm is taken to curb plate that sets up on the width direction, then single battery area in the prior art this moment is: (100+0.6×2+0.1×2+2) ×50+0.6×2+0.1×2+3) = 5624.96mm 2 Compared with the prior art, the application reduces the volume occupation by at least 3%, and in actual production, more battery end plates and side plates are needed to realize the grouping of a plurality of batteries and the grouping of a plurality of rows of batteries, and the volume occupation is more.
In an alternative embodiment, the ratio of the thickness of the first and second spacers 121 and 123 to the thickness of the insulating layer 130 is 1 to 2, and when the thickness of the first and second spacers 121 and 123 is 0.5 to 1mm, the thickness of the insulating layer is 0.5 to 1mm, thereby improving the volume utilization rate, facilitating the production and manufacture of the insulating layer, and further ensuring the insulation property and the heat insulation property of the insulating layer. The embodiment of the application also provides a manufacturing method of the battery pack 010, which can be used for manufacturing the battery pack 010 provided by the embodiment. The manufacturing method comprises the following steps:
step S100, plugging a baffle assembly into a box body with an opening at one end to form a plurality of chambers with openings.
Taking the battery pack 010 provided in the embodiment of the application as an example, the second separator 123 may be inserted into the second clamping groove 114, and after the second separator is inserted, the first separator 121 may be inserted into the first clamping groove 112, and meanwhile, the first matching groove 122 of the first separator 121 and the second matching groove 124 of the second separator 123 may be inserted into each other.
In step S200, the inner surface of the chamber is eroded.
Optionally, step S200 may specifically include: the inner surface of the chamber is sequentially soaked in an alkaline solution, a first acid solution and a second acid solution, wherein the acidity of the first acid solution is stronger than that of the second acid solution. The alkaline solution is soaked first, and the alkaline solution can play a role in removing greasy dirt on the surface. After the first acid solution is soaked, the inner surface of the chamber 101 is changed from the original smooth surface to a 'coral reef' structure with nano-scale holes. After the second acid solution is soaked, the inner surface of the chamber 101 further forms nano-sized holes of smaller size. After the inner surface of the chamber 101 is roughened, the adhesion of the insulating layer 130 can be enhanced, the connection strength of the insulating layer 130 can be improved, and falling-off can be prevented.
Further, after the second acid solution is soaked, or while the second acid solution is soaked, a treating agent can be used for soaking, and the treating agent can remain in the holes.
Step S300, a mold is placed in the cavity, and a gap is reserved between the mold and the inner surface of the cavity.
It will be appreciated that the size of the gap between the mould and the inner surface of the chamber 101 corresponds to the thickness of the insulating layer 130 to be formed later.
Step S400, injecting nano injection molding material into a gap between the mold and the inner surface of the cavity, forming an insulating layer attached to the inner surface of the cavity after the nano injection molding material is cooled, and removing the mold.
Step S500, a bare cell is placed in the cavity, a cell top cover is installed at the opening of the cavity, and electrolyte is injected into the cavity.
The battery pack 010 and the manufacturing method thereof provided by the embodiment of the application have the advantages that: through separating into a plurality of cavities 101 with box 110 inner chamber through baffle subassembly 120, realized the mode of naked electric core 200 direct access case, saved electric core casing and traditional electric core loaded down with trivial details fixed mode, reduced spare part quantity by a wide margin, the integrated level is higher, and weight is lighter. The diaphragm assembly 120 is combined with the case 110 through nano injection molding, so that the overall rigidity is enhanced, and the strength is higher. Through the integration of nano injection molding, a protective layer is formed on the surface of the baffle plate assembly 120, so that the electrolyte corrosion resistance performance is better, and the service life of the battery pack 010 is prolonged.
In addition, the embodiment of the application also provides electric equipment, which comprises the battery pack 010 or the battery pack 010 manufactured by the manufacturing method. The electric equipment can be traffic vehicles such as new energy automobiles.
In summary, the battery pack 010 of the present application includes the battery case 100, the plurality of bare cells 200, the electrolyte, and the plurality of cell cover plates 300. The battery case 100 includes a case body 110 having an opening at one end and a separator assembly 120 disposed in the case body 110, the separator assembly 120 forming a plurality of chambers 101 having openings in the case body 110, an inner surface of each chamber 101 being covered with an insulating layer 130 to allow the respective chambers 101 to be hermetically, electrically and temperature-isolated from each other, the insulating layer 130 being formed through a nano injection molding process. The bare cells 200 are arranged in the chambers 101 in a one-to-one correspondence manner, electrolyte is filled in each chamber 101, and the cell cover plates 300 are arranged at the openings of the chambers 101 in a one-to-one correspondence manner. The battery box 100 provided by the application omits the use of a plurality of independent battery cell shells, realizes the isolation between bare battery cells 200 through the partition plate assembly 120, improves the integration level of the whole battery pack 010, does not need to be provided with a plurality of structural assemblies to realize battery grouping, and improves the whole volume utilization rate of the battery pack 010 while being convenient for production. And the insulating layer 130 formed by the nano injection molding process can play a good role in insulation, sealing and heat preservation, and has reliable stability.
The method for manufacturing the battery pack 010 provided by the application is used for manufacturing the battery pack 010. The electric equipment provided by the application comprises the battery pack 010, so that the electric equipment also has the corresponding beneficial effects.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present application should be included in the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (14)
1. A battery pack, comprising:
a battery box (100), wherein the battery box (100) comprises a box body (110) with an opening at one end and a baffle plate assembly (120) arranged in the box body (110), the baffle plate assembly (120) forms a plurality of chambers (101) with openings in the box body (110), and the inner surface of each chamber (101) is covered with an insulating layer (130) formed by nano injection molding in an integrated mode so as to isolate the chambers (101) from each other;
the bare cells (200) are arranged in the chambers (101) in a one-to-one correspondence manner;
an electrolyte filled in each of the chambers (101);
the battery cell cover plates (300) are arranged at the openings of the chambers (101) in a one-to-one correspondence mode.
2. The battery pack of claim 1, wherein the separator assembly (120) includes a plurality of first separators (121) and a plurality of second separators (123) arranged in a staggered manner, the first separators (121) extending in a first direction and the second separators (123) extending in a second direction, the first direction being perpendicular to the second direction.
3. The battery pack according to claim 2, wherein the battery box (100) comprises a bottom plate (115) and a frame arranged on the bottom plate (115), a plurality of first clamping grooves (112) and a plurality of second clamping grooves (114) are arranged on the frame, two ends of the first partition plate (121) are respectively inserted into the two first clamping grooves (112), and two ends of the second partition plate (123) are respectively inserted into the two second clamping grooves (114).
4. A battery pack according to claim 3, wherein the thickness of the first separator (121) is smaller than the width of the first clamping groove (112), and a gap between the first separator (121) and a side wall of the first clamping groove (112) is filled with a first filling portion (131);
the thickness of the second partition plate (123) is smaller than the width of the second clamping groove (114), and a second filling part is filled in a gap between the second partition plate (123) and the side wall of the second clamping groove (114);
the first filling part (131), the second filling part and the insulating layer (130) are integrally formed through the nano injection molding process.
5. The battery pack according to claim 4, wherein the first clamping groove (112) is provided with first bosses (1121) respectively protruding on two side wall surfaces opposite to each other in the width direction thereof, and the first bosses (1121) abut against the first separator (121);
and second bosses are respectively and convexly arranged on two opposite side wall surfaces of the second clamping groove (114) in the width direction, and the second bosses are abutted against the second partition plate (123).
6. The battery pack according to claim 2, wherein at least one of the first separator (121) and the second separator (123) is provided with a fitting groove through which the first separator (121) and the second separator (123) are inserted and fitted.
7. The battery pack according to claim 2, wherein a ratio of the thickness of the first separator (121) and the second separator (123) to the thickness of the insulating layer is 1 to 2, and the thickness of the first separator (121) and the second separator (123) is 0.5 to 1mm.
8. The battery pack according to claim 2, wherein the thickness of the first separator (121) is 1 to 1.5 times the thickness of the second separator (123), and the extending direction of the first separator (121) is parallel to the plane direction of the bare cell (200).
9. A battery pack according to claim 3, wherein a gap is provided between the separator assembly (120) and the bottom plate (115), a third filling portion (132) is filled in the gap between the separator assembly (120) and the bottom plate (115) to isolate the respective chambers (101) from each other, and the third filling portion (132) and the insulating layer (130) are integrally formed by the nano injection molding process.
10. The battery pack according to any one of claims 1 to 9, wherein the material of the case (110) and the separator assembly is an aluminum alloy, stainless steel, carbon steel or magnesium alloy, and/or the material of the insulating layer (130) comprises PPS, PBT or PA.
11. The battery pack according to claim 10, wherein the material of the insulating layer (130) further comprises 10 to 35wt.% glass fibers, the thermal conductivity of the insulating layer (130) is less than or equal to 0.20W/m-K, and the thickness of the insulating layer (130) is 0.1 to 1mm.
12. A method of making a battery pack, comprising:
inserting a baffle assembly (120) into a box (110) having an opening at one end to form a plurality of chambers (101) having openings;
-etching an inner surface of the chamber (101);
-placing a mould in the chamber (101), a gap being reserved between the mould and the inner surface of the chamber (101);
injecting nano injection molding material into a gap between the mold and the inner surface of the cavity (101), forming an insulating layer attached to the inner surface of the cavity (101) after the nano injection molding material is cooled, and removing the mold;
a bare cell (200) is placed in the cavity (101), a cell top cover is installed at the opening of the cavity (101), and electrolyte is injected into the cavity (101).
13. The method of manufacturing a battery pack according to claim 12, wherein the step of etching the inner surface of the chamber (101) comprises:
the inner surface of the chamber (101) is sequentially soaked in an alkaline solution, a first acid solution and a second acid solution, wherein the acidity of the first acid solution is stronger than that of the second acid solution.
14. A powered device comprising a battery pack according to any one of claims 1-11, or comprising a battery pack made by the method of making a battery pack according to claim 12 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310484430.4A CN116845449A (en) | 2023-04-28 | 2023-04-28 | Battery pack, manufacturing method thereof and electric equipment |
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| CN202310484430.4A CN116845449A (en) | 2023-04-28 | 2023-04-28 | Battery pack, manufacturing method thereof and electric equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995989A (en) * | 2024-04-07 | 2024-05-07 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117995989A (en) * | 2024-04-07 | 2024-05-07 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
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Country or region after: China Address after: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant after: Jiangsu Zhengli New Energy Battery Technology Co.,Ltd. Address before: 215500 No. 68, Xin'anjiang Road, Southeast street, Changshu, Suzhou, Jiangsu Applicant before: Jiangsu Zenergy Battery Technologies Co.,ltd Country or region before: China |
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