WO2017162213A1 - Bloc-batterie et son procédé d'assemblage - Google Patents

Bloc-batterie et son procédé d'assemblage Download PDF

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Publication number
WO2017162213A1
WO2017162213A1 PCT/CN2017/078214 CN2017078214W WO2017162213A1 WO 2017162213 A1 WO2017162213 A1 WO 2017162213A1 CN 2017078214 W CN2017078214 W CN 2017078214W WO 2017162213 A1 WO2017162213 A1 WO 2017162213A1
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WO
WIPO (PCT)
Prior art keywords
battery
metal plate
adjacent
battery pack
battery cells
Prior art date
Application number
PCT/CN2017/078214
Other languages
English (en)
Chinese (zh)
Inventor
孙尚传
Original Assignee
安徽巨大电池技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 安徽巨大电池技术有限公司 filed Critical 安徽巨大电池技术有限公司
Publication of WO2017162213A1 publication Critical patent/WO2017162213A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/247—Arrangements for tightening a stack, for accommodation of a stack in a tank or for assembling different tanks
    • H01M8/2475—Enclosures, casings or containers of fuel cell stacks
    • 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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • 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
    • H01M50/183—Sealing members
    • H01M50/19—Sealing members characterised by the material
    • H01M50/193—Organic material
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • H01M8/2465—Details of groupings of fuel cells
    • H01M8/2484—Details of groupings of fuel cells characterised by external manifolds
    • H01M8/2485—Arrangements for sealing external manifolds; Arrangements for mounting external manifolds around a stack
    • 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
    • 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
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

Definitions

  • the present invention relates to the technical field of battery manufacturing, and in particular to a battery pack and a method of assembling the same.
  • bipolar battery structure is a common design method.
  • Bipolar batteries can be used to increase battery energy storage capacity based on weight and volume, reduce package weight and volume, and provide stable battery. Performance and low internal resistance.
  • the structure of a bipolar battery generally comprises a conductive bipolar layer, a so-called bipolar plate, which serves as an electrical interconnection between adjacent cells in a battery and as a partition between individual cells.
  • the bipolar plates need to be sufficiently conductive to transfer current from one single cell to another and have good chemical stability in the battery environment.
  • FIG. 1 is a schematic diagram showing the structure of a commonly used bipolar battery in the prior art (refer to the application file of CN1555584A).
  • the bipolar plate 2 is disposed.
  • a plurality of battery cells are formed at intervals inside the battery case 1.
  • the two sides of the bipolar plate 2 are the positive and negative electrodes of the battery (reference numerals 3 and 5 in the figure), and the insulating separator 4 between the positive and negative electrodes of the battery.
  • the liquid is filled in the gap between the respective bipolar plates 2.
  • bipolar battery structure when a battery unit expands or is damaged, it is easy to damage the battery unit adjacent thereto due to the unbuffered structure, for example, due to expansion, implicated damage and its phase.
  • the adjacent battery unit may even expand the entire outer casing of the battery, thereby destroying the entire battery pack structure. Therefore, a bipolar battery of such a structure is likely to cause a situation in which the entire battery pack is destroyed due to a failure of a single battery unit.
  • Embodiments of the present invention provide a battery pack and an assembly method thereof to solve the technical problem that the battery pack structure is unstable due to the lack of a safety protection structure existing in the prior art bipolar battery structure.
  • an embodiment of the present invention provides a battery pack including at least two battery units stacked, the outer casing of the battery unit includes an upper metal plate and a lower metal plate, and the upper metal plate A seal is disposed between the lower metal plate and the metal plate portions of the adjacent battery cells are electrically connected together.
  • the metal plates of adjacent battery cells are separated at one end, and the sealing member is disposed at one end of the separated metal plates.
  • the metal plates of adjacent battery cells are separated at both ends, and the sealing members are disposed at both ends of the separated metal plates.
  • the seal is made of an elastic material.
  • the sealing member is of two layers, and the material modulus of elasticity of the inner cell seal adjacent to the cell unit is greater than the material modulus of elasticity of the cell seal adjacent to the cell unit.
  • each of the battery cells includes an anode plate, a cathode plate, and an insulating spacer disposed between the cathode plate and the anode plate.
  • adjacent metal sheets of adjacent battery cells are provided with elastic supports between the separated ends.
  • the elastic support body is at least elastically deformable by 15% in the stacking direction of the battery cells.
  • the battery pack further includes a circuit board disposed between separate ends of adjacent metal plates of adjacent battery cells.
  • the outer periphery of the end portions of the two metal plates separated from the same battery unit is further provided with a sealing tape.
  • the present invention also provides a battery assembly method, the assembly method comprising:
  • the outer casing of the battery unit comprises an upper metal plate and a lower metal plate, and a sealing member is disposed between the upper metal plate and the lower metal plate;
  • a plurality of the battery cells are stacked and electrically connected together of metal plate portions of adjacent battery cells to form a battery pack.
  • the step of generating a plurality of battery units specifically includes:
  • An anode plate and a cathode plate are respectively attached to the upper and lower surfaces of the insulating spacer to form a battery inner core;
  • a sealing material is respectively attached to the opposite ends of the upper and lower metal plates;
  • the metal plates of the adjacent battery cells are separated at one end, and the sealing member is disposed at one end of the metal plate.
  • the metal plates of adjacent battery cells are separated at both ends, and the sealing members are disposed at both ends of the separated metal plates.
  • the sealing material is an elastic material.
  • a plurality of sealing materials may be respectively attached to the opposite ends of the upper and lower metal plates, and each The sealing material is different, and the elastic modulus of the sealing material near the inner side of the battery unit is greater than the elastic modulus of the sealing material near the outer side of the battery unit.
  • the method further comprises providing an elastic support between the separated ends of adjacent metal sheets of adjacent battery cells.
  • the method further comprises disposing a circuit board between the separated ends of adjacent metal sheets of adjacent battery cells.
  • the method further comprises applying a sealing tape on the outer periphery of the ends of the two metal plates separated from the same battery unit.
  • the battery pack and the assembling method thereof provided by the invention provide a separation area at the end of the battery unit casing, and when the battery unit expands, the separation area can buffer or eliminate the battery due to the expansion.
  • the problem that the unit volume becomes large is that an elastic sealing member is disposed at the end of the battery unit. When the battery unit expands, the elastic sealing member is elastically deformed, and the battery unit can also be expanded and protected.
  • FIG. 1 is a schematic structural diagram of a conventional bipolar battery in the prior art
  • FIG. 2 is a schematic structural view of a first embodiment of a battery pack of the present invention
  • Figure 3 is a structural view of a first embodiment of a battery unit
  • FIG. 4 is a schematic structural view of a second embodiment of the battery pack of the present invention.
  • Figure 5 is a structural view of a second embodiment of the battery unit
  • Figure 6 is a structural view of a third embodiment of the battery unit
  • Figure 7 is a schematic view showing the deformation of the first sealing member 121 in the embodiment of Figure 6;
  • Figure 8 is a schematic structural view of a third embodiment of the battery pack of the present invention.
  • Figure 9 is a structural view of a fourth embodiment of a battery unit
  • Figure 10 is a schematic view showing the deformation of the arc segment of the battery unit in the embodiment of Figure 9;
  • Figure 11 is a schematic structural view of a fourth embodiment of the battery pack of the present invention.
  • Figure 12 is a schematic structural view of a seventh embodiment of the battery pack of the present invention.
  • Figure 13 is a schematic view showing a modified embodiment of the battery pack structure in the embodiment of Figure 12;
  • Figure 14 is a schematic view showing another modified embodiment of the battery pack structure in the embodiment of Figure 12;
  • 15 is a schematic flow chart of a first embodiment of a method for assembling a battery pack of the present invention.
  • Figure 16 is a schematic view showing a metal plate manufacturing process
  • Figure 17 is a schematic view showing a sealing material of a metal plate
  • Figure 18 is a schematic view showing the structure of a battery core in a metal plate in the first method embodiment
  • FIG. 19 is a schematic flow chart of a second embodiment of a method for assembling a battery pack of the present invention.
  • 20 is a first structural schematic view showing a method of pressing a battery inner core into a metal plate in a second method embodiment
  • 21 is a second schematic structural view of a second method embodiment for pressing a battery inner core into a metal plate
  • 22 is a third structural schematic view showing a method of pressing a battery inner core into a metal plate in a second method embodiment
  • Figure 23 is a fourth structural view showing the second embodiment of the battery core being pressed into the metal plate.
  • FIG. 2 is a schematic structural diagram of a first embodiment of a battery pack according to the present invention
  • the battery pack in the embodiment includes five battery units (A, B, C, D, E), of course, in other embodiments.
  • the number of battery cells is not limited to five, and may be two, three, four, six, or more. The exact amount depends on the output voltage requirements of the battery.
  • a plurality of battery cells connected in series may constitute a battery pack having a specified output voltage.
  • the outer side of the battery pack is the upper and lower end plates (11, 22), and the upper and lower end plates (11, 22) may be metal current collecting plates, which function as conductive and external support, and therefore need to have electrical conductivity and have A certain mechanical strength.
  • the upper and lower end plates (11, 22) may also be support plates for forming the outer casing of the battery pack.
  • the upper and lower end plates (11, 22) can provide metal support inside the battery case.
  • the upper and lower end plates (11, 22) can also serve as external positive and negative electrodes of the battery pack.
  • FIG. 3 is a structural diagram of a first embodiment of a battery unit. Both sides of each battery unit are provided with an upper metal plate and a lower metal plate 110. The metal plate portions of adjacent battery cells are electrically connected together. That is, the lower metal plate of the previous battery unit and the upper metal plate portion of the next battery unit are electrically connected together.
  • Each of the metal plates 110 may be divided into a connection region 111 and a separation region 112 based on a partial conductive connection between adjacent battery cells, wherein the connection region 111 is a metal plate and a metal plate of an adjacent battery cell is electrically connected. The area, the separation area is the area where the metal plate is separated from the metal plate of the adjacent battery unit.
  • the separation region 112 is disposed at one end of the metal plate 110, and the other end is the connection region 111 directly connected together.
  • the connection region 111 and the separation region 112 are integrally formed, and can be stamped by the same metal sheet. to make.
  • adjacent metal plate connection regions 111 of adjacent battery cells are directly abutting connections, of course, in other embodiments, adjacent metal plate connection regions 111 of adjacent battery cells are also It may be indirectly connected by a conductive substance. Adjacent metal plate connection regions 111 of adjacent battery cells may be pressed together, or welded together, or bonded together using a conductive adhesive or the like.
  • adjacent metal plate separation regions 112 of adjacent battery cells are separated to form a gap 505.
  • Such a structure can be pressed and contracted at the gap 505 formed at the separation region 112 when the battery unit is expanded or squeezed, and can cancel or alleviate the deformation of the battery unit metal plate.
  • the gap 505 at the separation region 112 corresponds to a buffer-type safety protection structure, which can effectively prevent the battery unit from being damaged. Ensure the stability of the battery pack structure.
  • the space of the gap 505 should not be too small.
  • the width L of the gap 505 is at least 20% of the thickness of the battery unit, and more preferably, the width L of the gap 505 is at least 40% of the thickness of the battery unit.
  • Those skilled in the art can also set the value of the width L of the gap 505 according to actual needs. Of course, in consideration of the battery capacity, the gap 505 cannot be set too large.
  • Each of the battery cells includes an anode plate 131, a cathode plate 132, and an insulating separator 133 disposed between the cathode plate 132 and the anode plate 131.
  • the anode and cathode plates between adjacent battery cells are alternately arranged.
  • a cavity 134 inside the battery unit is used to house the electrolyte.
  • Adjacent metal sheets of adjacent battery cells are preferably made of different materials.
  • the metal plate adjacent to the anode plate 131 can be selected based on the potential of the anode, such as copper or other materials.
  • the metal plate adjacent to the cathode plate 132 can be selected based on the potential of the cathode, such as aluminum or other materials. In other words, metal plates that are close to different plates can be selected based on the potential requirements of the cathode and anode.
  • the material for the anode plate 131 and the cathode plate 132 may be any suitable battery material.
  • the material of the anode plate 131 may be an alloy or an oxide of tin, lithium, calcium, or the like, or may be other materials capable of functioning as an anode of a battery such as silicon or graphite.
  • the material of the cathode plate 132 may be an oxide of lithium and lithium cobaltate. Lithium carbonate and the like are within the scope of those skilled in the art and will not be enumerated here.
  • the thickness of the metal plate 110 is preferably 2 to 100 ⁇ m, and on the one hand, the requirements for the bending process of the metal plate 110 can be satisfied, and on the other hand, the sealing strength of the battery unit can be satisfied. Further preferably, the metal plate 110 may have a thickness of between 5 and 80 microns.
  • a sealing member 120 is disposed between the separation regions 112 of the two metal plates of the same battery unit, so that two adjacent metal plates of the same battery unit can be sealingly combined to prevent electrolyte leakage.
  • the electrolyte can be solid, colloidal or liquid.
  • the seal 120 is capable of electrochemical isolation by sealing between adjacent battery cells.
  • the material of the sealing member 120 may be any material having good adhesion between metal layers and having good elasticity, such as composite materials, including rubber-asbestos, aerogel felt-polyurethane, etc.; rubber Class materials or plastics, etc.
  • FIG. 4 is a schematic structural view of a second embodiment of the battery pack of the present invention.
  • the battery pack in the embodiment also includes A, B, C, D, and E.
  • the difference between the five battery cells and the previous embodiment is that in the embodiment, the battery unit has a separation area at both ends, and a sealing member is disposed between the separation regions of the two metal plates of the same battery unit.
  • the structure can form more gaps 505 between the separation regions, thus further increasing the coefficient of expansion of the battery cells, which is doubled compared to the structure in Embodiment 1.
  • FIG. 5 is a structural diagram of a second embodiment of the battery unit.
  • the structure of the sealing member 120 is not limited to the structure in the embodiment, and may be a structural form extending to the inside of the battery unit cavity.
  • FIG. 6 is a structural diagram of a third embodiment of the battery unit.
  • a plurality of sealing members are disposed between the separated ends of the same end of the two metal plates of the same battery unit, and when the same battery unit is When a plurality of seals are disposed between the separated regions at the same end of the metal plate, the material of each seal may be the same or different.
  • the number of the sealing members in the embodiment is preferably two, that is, the first sealing member 121 and the second sealing member 122 in the figure, wherein the first sealing member 121 is located near the inner side of the battery unit, and the second sealing member 122 is located near the outer side of the battery unit.
  • the material elastic modulus of the first sealing member 121 near the inner side of the battery unit is greater than the material elastic modulus of the second sealing member 122 adjacent to the outer side of the battery unit, and more preferably, the thickness of the first sealing member 121 is smaller than the thickness of the second sealing member 122.
  • FIG. 7 is a schematic view showing the deformation of the first sealing member 121 in the embodiment of FIG. 6. The broken line in the figure indicates the deformation of the first sealing member 121.
  • FIG. 8 is a schematic structural view of a third embodiment of a battery pack according to the present invention.
  • adjacent ones of adjacent battery cells of the adjacent battery cells are disposed at the same end separation region.
  • the elastic support body 506 corresponds to a position where the elastic support body is filled to the original gap 505, and the elasticity of the elastic support body 506 can enhance the extension of the stacking direction of the battery pack.
  • the elastic support 506 can use any suitable material.
  • a material having the following properties such as silicone rubber, ethylene propylene diene monomer, polyethylene, and polyvinyl chloride is excellent in insulation, and can coexist with an electrolyte and can be stabilized at a voltage of 10 volts or less and 200 degrees or less.
  • the elastic support body is at least elastically deformable by 15% or more in the stacking direction of the battery cells.
  • FIG. 9 is a structural view of a fourth embodiment of the battery unit
  • FIG. 10 is a schematic view showing deformation of the arc segment of the battery unit in the embodiment of FIG. 9.
  • the battery of the embodiment and the embodiment 1 The unit structure is different in that the separation region 112 includes an arc segment 1102 bent toward the inner side of the battery unit. When the battery unit expands or is squeezed, the arc segment 1102 protrudes outward to offset or relieve the metal plate of the battery unit. deformation.
  • connection region 111 and the separation region 112 are a unitary structure, wherein the material thickness of the arc segment 1102 is smaller than the thickness of the other portion of the separation region 112 and the material of the connection region 111, or the thickness of the arc segment 1102 is smaller than the connection region 111. And one of the other portions of the separation region 112, the thickness of the material of the curved segment 1102 is designed to be smaller, mainly considering that the arc segment 1102 is less than the adjacent material when the cell is expanded or squeezed.
  • the connection region 111 and the separation region 112 can be more easily deformed, and the connection region 111, the separation region 112, and other portions of the battery unit are structurally stabilized to prevent damage of the battery unit.
  • the broken line in Fig. 10 indicates the case where the curved segment 1102 is deformed.
  • the material thickness of the metal plate in the curved segment 1102 can be reduced by 10%-50% compared to the thickness of the connection region 111 and/or the separation region 112, for example, 20%, 25%, 30%, 40%, etc. can be thinned. .
  • FIG. 11 is a schematic structural view of a fourth embodiment of the battery pack of the present invention.
  • the structure is set between adjacent battery cells compared to the structure of the first embodiment.
  • the conductive blocks 88 are specifically provided with gaps 801 between adjacent metal plate connection regions of adjacent battery cells and connected together by the conductive blocks 88.
  • the material of the conductive block 88 is preferably made of a soft material such as aluminum, titanium alloy or the like.
  • the soft material has the advantage that, when the battery unit expands or is squeezed, the conductive block 88 functions to electrically connect adjacent metal plates on the one hand, and can also undergo a certain deformation on the other hand, so that the battery unit is In addition to the deformation at the separation region 112, deformation can also occur at the location of the connection region 111.
  • FIG. 12 is a schematic structural view of a fifth embodiment of a battery pack according to the present invention.
  • the battery pack further includes a circuit board 150 disposed between the adjacent end regions of adjacent metal plates of adjacent battery cells.
  • Circuit board 150 is used for battery pack balancing, thermal management, or other possible functions.
  • the advantage of providing the circuit board 150 inside the battery pack is that the internal space of the battery pack can be fully utilized, and the number and length of the wires can be reduced without extending the wires of the electrodes to the outside of the battery pack case (not shown), thereby enhancing the battery.
  • the overall sealing of the group In order to further utilize the internal space of the battery pack, the circuit board 150 is preferably disposed on the same side of the separation area or on the same side of the battery pack.
  • FIG. 13 is a schematic diagram showing a modified embodiment of the battery pack structure in the embodiment of FIG. 12.
  • a sealing tape 160 is also attached to the outer periphery of the separation portion of the same end of the plate.
  • the material of the sealing tape 160 may be a material such as ceramic or polymer.
  • the function of the sealing tape 160 includes preventing the circuit board 150 from being short-circuited, providing better chemical or electrochemical stability, and providing better mechanical strength of the battery unit and the like.
  • FIG. 14 is a schematic view showing another modified embodiment of the battery pack structure in the embodiment of FIG. 12, in which the sealing tape 160 is not It must be provided together with the circuit board 150, and of course, the sealing tape 160 may be separately provided on the outer periphery of the battery cell separation region as shown in FIG.
  • the battery units are respectively provided with different safety protection structures, including a gap at the separation area, an elastic support body, and an arc segment between the connection area of the metal plate and the separation area, etc.
  • different safety protection structures including a gap at the separation area, an elastic support body, and an arc segment between the connection area of the metal plate and the separation area, etc.
  • the circuit board is placed inside the battery pack to improve battery space utilization and is enhanced by providing sealing tape. Protection and sealing performance.
  • the above embodiment is a description of the overall structure of the battery unit and the battery pack.
  • the technical features in the above embodiments may, after different combinations, further extend more embodiments, and the skilled person does not have to work creatively.
  • a simple combination of the technical features of the present invention should also be within the scope of the present invention.
  • FIG. 15 is a schematic flow chart of a first embodiment of a method for assembling a battery pack according to the present invention, which includes, but is not limited to, the following steps.
  • Step S100 generating a plurality of battery cells, wherein the outer casing of the battery unit comprises an upper metal plate and a lower metal plate, and a sealing member is disposed between the upper metal plate and the lower metal plate.
  • step S110 a plurality of battery cells are stacked and electrically connected together of the metal plate portions of the adjacent battery cells to form a battery pack.
  • the method further includes the following steps: firstly, an anode plate and a cathode plate are respectively attached to the upper and lower surfaces of the insulating spacer to form a battery inner core; and then the upper and lower metal plates are oppositely The end portions of the side are respectively attached with a sealing material; and the battery core is pressed into the metal plate to form a battery unit; wherein the upper and lower metal plates are bonded together by the sealing material, and a sealed receiving cavity is formed. The battery core is disposed in the sealed receiving cavity.
  • FIG. 16 is a schematic diagram of a metal plate manufacturing process.
  • a metal plate is first formed, and the metal plate 110 can be first pressed out of the connection region 111 and the separation region 112, and then the two metal plates are connected.
  • the regions 111 are fixedly connected to each other in which it is necessary to ensure that the gap between the adjacent metal plate separation regions 112 is larger than the gap between the connection regions 111, forming the structure shown in the drawing.
  • This structure is generally referred to as a bipolar plate, and a fixed connection between adjacent metal plates of adjacent battery cells is employed.
  • adjacent metal plate connection regions 111 of adjacent battery cells are directly abutting connections, of course, in other embodiments, adjacent metal plate connection regions 111 of adjacent battery cells are also It may be indirectly connected by a conductive substance. Adjacent metal plate connection regions 111 of adjacent battery cells may be pressed together, or welded together, or bonded together using a conductive adhesive or the like. Adjacent metal plate separation regions 112 of adjacent battery cells are separated to form a gap. Such a structure can compress and contract the gap formed at the separation region 112 when the battery cell expands or is squeezed, and can cancel or alleviate the deformation of the battery unit metal plate. The gap at the separation area 112 is equivalent to a buffer type safety protection structure, which can effectively prevent the battery unit from being damaged and ensure the stability of the battery pack structure.
  • Adjacent metal sheets of adjacent battery cells are preferably made of different materials.
  • the metal plate adjacent to the anode plate 131 can be selected based on the potential of the anode, such as copper or other materials.
  • the metal plate adjacent to the cathode plate 132 can be selected based on the potential of the cathode, such as aluminum or other materials. In other words, metal plates that are close to different plates can be selected based on the potential requirements of the cathode and anode.
  • the material for the anode plate 131 and the cathode plate 132 may be any suitable battery material.
  • the material of the anode plate 131 may be an alloy or an oxide of tin, lithium, calcium, or the like, or may be other materials capable of functioning as an anode of a battery such as silicon or graphite.
  • the material of the cathode plate 132 may be an oxide of lithium and lithium cobaltate. Lithium carbonate and the like are within the scope of those skilled in the art and will not be enumerated here.
  • the thickness of the metal plate 110 is preferably 2 to 100 ⁇ m, and on the one hand, the requirements for the bending process of the metal plate 110 can be satisfied, and on the other hand, the sealing strength of the battery unit can be satisfied. Further preferably, the metal plate 110 may have a thickness of between 5 and 80 microns.
  • FIG. 17 is a schematic view showing the sealing material of the metal plate, and the sealing material 1205 is respectively attached to the opposite ends of the prepared metal plate.
  • a sealing member 120 is disposed between the separation regions 112 of the two metal plates of the same battery unit, so that two adjacent metal plates of the same battery unit can be sealingly combined to prevent electrolyte leakage.
  • the electrolyte can be solid, colloidal or liquid.
  • the seal 120 is capable of electrochemical isolation by sealing between adjacent battery cells.
  • the material of the sealing member 120 may be any material having good adhesion between metal layers and having good elasticity, such as composite materials, including rubber-asbestos, aerogel felt-polyurethane, etc.; rubber Class materials or plastics, etc.
  • FIG. 18 is a schematic structural view of the first embodiment of the battery core being pressed into the metal plate.
  • FIG. 19 is a schematic flow chart of a second embodiment of a method for assembling a battery pack according to the present invention; the method includes, but is not limited to, the following steps.
  • Step S200 generating a plurality of battery cells, wherein the outer casing of the battery unit comprises an upper metal plate and a lower metal plate, and a sealing member is disposed between the upper metal plate and the lower metal plate.
  • Step S210 stacking a plurality of battery cells, and electrically connecting the metal plate portions of adjacent battery cells together to form a battery pack; wherein the upper metal plate and/or the lower metal plate include a connection region and a separation region
  • the separation region includes an arc segment that is curved toward the inner side of the battery unit, and the thickness of the arc segment is thinned.
  • the metal plate 110 may have a flat structure before the pressing step, which is different from the case where the metal plate is first pressed out of the separation region and the connection region in the previous embodiment.
  • the separation region and the connection region are formed after the pressing, that is, the separation region and the connection region structure are pressed while bonding the sealing materials on both sides to form the sealing member, and the upper and lower metal plates are either
  • the separation region of the two includes an arc segment that is curved inside the battery unit, and the thickness of the arc segment is thinned so that when the battery unit expands or is squeezed, the arc segment can protrude outward to offset or relieve the battery. The deformation of the unit metal plate.
  • FIG. 20 is a first structural diagram of the second embodiment of the battery core being pressed into the metal plate.
  • FIG. 21 is a second embodiment of the battery core.
  • FIG. 22 is a schematic view showing a third structure in which a battery inner core is press-fitted into a metal plate in a second method embodiment, and
  • FIG. 23 is a second embodiment of the battery core.
  • Figure 20 is a schematic view showing the formation of the seals on both sides. After pressing, the structure of the battery unit in the embodiment of Fig. 4 is formed.
  • the reference numeral 110 is a metal plate, and the reference numeral 1205 is a sealing material (the same applies hereinafter); In the schematic diagram, sealing materials of different area sizes are disposed on both sides, and finally the structure of the battery unit in the embodiment of FIG. 5 can be obtained.
  • Figure 22 is a schematic view showing the formation of a one-sided seal. After pressing, the structure of the battery cell in the embodiment of Figure 3 is formed.
  • Figure 23 is a schematic view showing the structure of the multi-seal member. After pressing, the structure of the battery cell in the embodiment of Figure 7 is formed.
  • the embodiment of the method only gives a general assembly method for manufacturing the battery pack.
  • the battery pack can have many structures.
  • the battery pack corresponding to the deformed structure can be obtained by simple deformation of the method, and therefore will not be enumerated in the embodiment of the assembly method.
  • the separation region may be specifically disposed at one end or both ends of the metal plate; an elastic support body is disposed between the adjacent end regions of adjacent metal plates of adjacent battery cells; a circuit board is disposed between the adjacent metal plates of the unit at the same end separation area; a sealing tape is attached to the outer periphery of the same end of the same metal unit; and a plurality of seals and the like are provided, and detailed descriptions of these technical features are provided. Please refer to the relevant content in the above battery pack embodiment.
  • the battery pack assembly method provided by the embodiment of the present invention provides a safety protection structure in the battery unit, including a gap and an elastic support body at the separation area, and is disposed between the connection area of the metal plate and the separation area.
  • Arc segments, etc. can play the role of offsetting or mitigating the deformation of the battery unit metal plate when the battery unit expands or is squeezed.
  • the circuit board is placed inside the battery pack to improve the battery space utilization. And by providing sealing tape to enhance protection and sealing performance.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne un bloc-batterie et son procédé d'assemblage. Le bloc-batterie comprend au moins deux unités de batterie dans un agencement empilé. Un boîtier des unités de batterie comprend une plaque métallique supérieure et une plaque métallique inférieure. Un élément d'étanchéité est disposé entre la plaque métallique supérieure et la plaque métallique inférieure. Les plaques métalliques d'unités de batterie adjacentes sont partiellement reliées ensemble, d'une manière électriquement conductrice. Par comparaison à l'état de la technique, le bloc-batterie et son procédé d'assemblage selon la présente invention sont tels que, par agencement d'une zone de séparation aux extrémités des boîtiers des unités de batterie, lorsque les unités de batterie se dilatent, la zone de séparation atténue ou élimine le problème d'augmentation de volume des unités de batterie en raison de la dilatation ; en outre, grâce aux éléments d'étanchéité flexibles disposés aux extrémités des unités de batterie, lorsque les unités de batterie se dilatent, les éléments d'étanchéité flexibles sont distendus de manière flexible, ce qui permet d'obtenir également l'effet de protection de sécurité contre la dilatation des unités de batterie.
PCT/CN2017/078214 2016-03-25 2017-03-24 Bloc-batterie et son procédé d'assemblage WO2017162213A1 (fr)

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CN201610186636.9 2016-03-25

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CN113346170B (zh) * 2021-05-31 2023-05-02 宁德新能源科技有限公司 电池和电子装置

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