WO2022160297A1 - 电池组及其制造方法 - Google Patents

电池组及其制造方法 Download PDF

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Publication number
WO2022160297A1
WO2022160297A1 PCT/CN2021/074515 CN2021074515W WO2022160297A1 WO 2022160297 A1 WO2022160297 A1 WO 2022160297A1 CN 2021074515 W CN2021074515 W CN 2021074515W WO 2022160297 A1 WO2022160297 A1 WO 2022160297A1
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WO
WIPO (PCT)
Prior art keywords
battery
cell
tab
fixing plate
battery pack
Prior art date
Application number
PCT/CN2021/074515
Other languages
English (en)
French (fr)
Inventor
张惟栋
伍凯
Original Assignee
东莞新能安科技有限公司
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 东莞新能安科技有限公司 filed Critical 东莞新能安科技有限公司
Priority to CN202180091924.5A priority Critical patent/CN116830332A/zh
Priority to PCT/CN2021/074515 priority patent/WO2022160297A1/zh
Publication of WO2022160297A1 publication Critical patent/WO2022160297A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/514—Methods for interconnecting adjacent batteries or cells
    • 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

Definitions

  • the present application relates to a battery pack and a method for manufacturing the same.
  • a plurality of small modules are first connected in series, and then each small module is connected in parallel using copper bars.
  • This method has the following shortcomings: during the bending process of the tabs, the tabs need to be fixed first with a special fixture, and then the tabs are bent; the space between the tabs also needs to be filled with foam to fix the tabs , avoid short circuit.
  • the above method increases the use of foam and copper bars, increases the number of parts and the assembly process; the use of special fixtures also increases the processing and production cost.
  • the present application provides a battery pack
  • the battery module has a simple structure, can reduce the use of materials such as foam and copper bars, and at the same time improve the stability and strength of the battery module structure.
  • a battery pack comprising a battery pack casing and a battery module housed in the battery pack casing, the battery module comprising a plurality of battery cells stacked along a first direction, each Each cell includes a cell housing and a tab, and the tab includes a welding portion and a bending portion provided outside the cell housing.
  • the battery module includes a first battery cell and a second battery core arranged adjacently, the first battery core includes a first tab, and the second cell includes a second tab.
  • One side of the battery module is provided with a fixing plate, the fixing plate includes a main body part arranged along the first direction, and the main body part is provided with a first hole penetrating the fixing plate and a second hole communicating with the first hole.
  • the first accommodating groove is arranged on a side of the fixing plate close to the battery module, and the first hole is used for the first tab and the second tab to pass through the fixing plate.
  • the first accommodating groove is provided with a first inclined portion, and the first inclined portion is arranged at an inclined angle relative to the first direction, and the inclined angle is greater than 0 degrees.
  • the first bent portion of the first tab and the second bent portion of the second tab are disposed in the first receiving groove, and the first bent portion and the first inclined portion are in contact and connected.
  • the first welding part of the first tab and the second welding part of the second tab are welded and fixed.
  • the battery module includes a third battery cell and a fourth battery cell arranged adjacently, and the second battery cell and the third battery cell are arranged adjacently.
  • the third cell includes a third tab
  • the fourth cell includes a fourth tab.
  • the main body is provided with a second hole penetrating the fixing plate and a second accommodating groove communicating with the second hole, the second accommodating groove is arranged on the side of the fixing plate close to the battery module, the first accommodating groove is Two holes are used for the third tab and the fourth tab to pass through the fixing plate.
  • the second accommodating groove is provided with a second inclined portion, the third bending portion of the third tab and the fourth bending portion of the fourth tab are arranged in the second accommodating groove, and the The third bent portion and the second inclined portion are in contact and connected.
  • the third welding part of the third tab and the fourth welding part of the fourth tab are welded and fixed.
  • the battery pack includes a plurality of conductive sheets arranged on the fixing plate, and the first welding part, the second welding part, the third welding part and the fourth welding part are welded to the same conductive plate. piece.
  • first tab and the second tab are positive tabs, and the first cell and the second cell are connected in parallel.
  • the third tab and the fourth tab are negative tabs, and the third cell and the fourth cell are connected in parallel.
  • the cell housing includes an accommodating portion for accommodating the electrode assembly of the cell and a sealing portion extending outward from a periphery of the accommodating portion, and the accommodating portion includes oppositely disposed along the first direction. a first surface, a second surface connecting the first surface and the sealing part, the tabs extending from the sealing part out of the cell casing.
  • the first inclined portion includes a first left inclined portion and a first right inclined portion disposed opposite to each other, the first left inclined portion is in contact and connection with the first bending portion, and the first right inclined portion is in contact with each other.
  • the first left inclined portion is inclined at an obtuse angle along the first direction, and the first right inclined portion is inclined at an acute angle along the first direction.
  • the obtuse angle ranges from 135 degrees to 140 degrees, and the acute angle ranges from 40 degrees to 45 degrees.
  • the fixing plate includes a first left connecting portion and a first right connecting portion.
  • the first left connecting portion is connected with the first left inclined portion, and the first left connecting portion is connected in contact with the sealing portion of the first cell.
  • the first right connecting portion is connected with the first right inclined portion, and the first right connecting portion is connected in contact with the sealing portion of the second cell.
  • the second inclined portion includes a second left inclined portion and a second right inclined portion disposed opposite to each other, the second left inclined portion is in contact with the third bending portion, and the second right inclined portion is in contact with each other.
  • the second left inclined portion is inclined at the obtuse angle along the first direction, and the second right inclined portion is inclined at the acute angle along the first direction.
  • the fixing plate includes a second left connecting portion and a second right connecting portion.
  • the second left connecting portion is connected with the second left inclined portion, and the second left connecting portion is connected in contact with the sealing portion of the third cell.
  • the second right connecting portion is connected with the second right inclined portion, and the second right connecting portion is in contact with the sealing portion of the fourth cell.
  • the first right connecting portion extends a first horizontal portion at an end close to the cell
  • the second left connecting portion extends a second horizontal portion at an end close to the cell
  • the first The horizontal portion is connected to the second surface of the second cell
  • the second horizontal portion is connected to the second surface of the third cell.
  • first horizontal portion and the second horizontal portion are in contact and connected, and the part of the contact and connection extends between the first surface of the second cell and the first surface of the third cell.
  • the first right connecting portion has a first transverse portion extending from an end away from the cell, and the first transverse portion is in contact and connected with the first right inclined portion.
  • the second left connecting portion has a second lateral portion extending from one end away from the battery core, and the second lateral portion is in contact and connection with the second left inclined portion.
  • the fixing plate includes a slot formed between the first right connecting portion and the second left connecting portion, the slot being arranged between the first receiving groove and the second receiving groove, the A conductive sheet covers the slot.
  • the fixing plate is provided with an opening and a resin layer disposed in the first receiving groove, the opening is communicated with the first receiving groove, and the opening is used for injecting resin into the first receiving groove.
  • a receiving groove, a resin layer is formed after the resin is fixed, and the resin is used for fixing the battery core and the fixing plate.
  • the present application also provides a method for manufacturing a battery pack, comprising the steps of:
  • the battery module manufacturing method stacking a plurality of battery cells along the first direction, and using a tooling fixture to gather and shape the welding parts of the tabs of the adjacent battery cells to obtain a battery module;
  • Install the fixing plate Install the fixing plate on the battery module, and make the bending part of the tab bend and fit the inclined part with the help of the inclined part of the fixing plate, and the welding part of the tab sticks out of the first hole of the fixing plate .
  • the stacking and arranging the plurality of battery cells along the first direction includes: stacking each two battery cells in such a manner that the positive electrode ear is aligned with the positive electrode ear and the negative electrode ear is aligned with the negative electrode ear to form a plurality of battery cell groups. , stacking the plurality of battery cell groups in a manner that the positive electrode lugs are aligned with the negative electrode lugs, and the negative electrode lugs are aligned with the positive electrode lugs.
  • the battery cells are stacked by foam
  • the battery packs are stacked by foam
  • the two sides and bottom of the battery module are pasted with foam.
  • the manufacturing method further includes arranging the insulating member on the fixing plate, then installing the integrated battery management unit on the insulating member, and fixing it with bolts.
  • the manufacturing method further includes a welding step of bending the welding portion, and welding the bent welding portion to the conductive sheet on the fixing plate.
  • a corresponding fixing plate is designed to position and fix the cells, and an electrical connection relationship between the cells is formed in parallel first and then in series.
  • the design structure reduces the use of copper bars such as foam, U-shaped copper bars or "mouth"-shaped copper bars;
  • the fixing plate is provided with a structure similar to the outer surface of the cell, which can fix the position of the cell to avoid short Connect and reduce the pressure on the battery core to protect the battery core, and at the same time reduce the use of foam;
  • a plurality of inclined parts are arranged in the receiving groove for guiding the tabs, which is convenient for the installation of the tabs.
  • the battery pack and its manufacturing method provided by the present application have a simple structure, can reduce the use of materials such as foam and copper bars, and at the same time improve the strength and stability of the battery pack structure.
  • FIG. 1 is an exploded view of a battery pack provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a partial structure of the battery pack shown in FIG. 1 .
  • FIG. 3 is a schematic structural diagram of the fixing plate and the battery module in FIG. 1 .
  • FIG. 4 is a schematic structural diagram of the cell in FIG. 3 .
  • FIG. 5 is an enlarged view of A in FIG. 3 .
  • FIG. 6 is a cross-sectional view of the fixing plate in FIG. 3 .
  • FIG. 7 is a top view of the fixing plate in FIG. 3 .
  • FIG. 8 is a bottom view of the fixing plate of FIG. 3 .
  • FIG. 9 is a schematic diagram of the connection between the electrode tabs of the battery and the conductive sheet in FIG. 3 .
  • FIG. 10 is a schematic structural diagram of the upper cover shown in FIG. 1 .
  • FIG. 11 is a schematic diagram of the inner surface structure of the first side wall and the second side wall shown in FIG. 1 .
  • the first end plate 101 is the first end plate 101
  • Insulation layer 109 Insulation layer 109
  • the first cell 201 The first cell 201
  • the second cell 202 The second cell 202
  • the third cell 203 The third cell 203
  • the fourth cell 204 The fourth cell 204
  • Electrode assembly 207
  • the first welding department 2091 The first welding department 2091
  • the first left inclined part 3021 is the first left inclined part 3021
  • connection can be a fixed connection, a detachable connection, or an integrated; it can be A mechanical connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements, unless otherwise explicitly defined.
  • fixed can be a fixed connection, a detachable connection, or an integrated; it can be A mechanical connection can also be an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication between two elements or the interaction relationship between the two elements, unless otherwise explicitly defined.
  • FIG. 1 is an exploded view of a battery pack provided by an embodiment of the application
  • FIG. 2 is a partial structural schematic diagram of the battery pack shown in FIG. 1
  • FIG. 3 is the fixing plate 30 and A schematic diagram of the structure of the battery module 20 .
  • the battery pack includes a battery pack casing 10 and a battery module 20 accommodated in the battery pack casing 10 .
  • the battery pack case 10 includes a first end plate 101 and a second end plate 102 arranged opposite to each other, a first side wall 103 and a second side wall 104 arranged opposite to each other, and an upper cover 105 .
  • the first end plate 101, the second end plate 102, the first side wall 103 and the second side wall 104 form a cavity (not shown), and the battery module 20 is accommodated in the cavity (not shown).
  • the upper cover 105 covers one end of the cavity.
  • An integrated battery management unit (BMU) 40 and an insulating member 50 are disposed between the upper cover 105 and the fixing plate 30 in sequence.
  • the insulating member 50 may be a polycarbonate (PC) sheet.
  • the battery module 20 includes a plurality of battery cells stacked along the first direction.
  • the first direction is the thickness direction of the cell, which can be understood as the direction from the first end plate 101 to the second end plate 102 in FIG. 1 , that is, the extending direction of the fixing plate 30 .
  • a fixing plate 30 is provided on one side of the battery module 20 .
  • the cell includes a cell casing 206 , a tab 205 and an electrode assembly 207 .
  • the tab 205 includes a welding portion 209 and a bending portion 208 disposed outside the cell casing 206 .
  • the cell The casing 206 includes a accommodating portion 2031 for accommodating the electrode assembly 207 and a sealing portion 2032 extending outward from the periphery of the accommodating portion 2031 , and the tabs 205 extend out of the cell casing 206 from the sealing portion 2032 .
  • each cell includes two tabs, one positive tab and one negative tab, the two tabs extend out of the cell housing from the same end of the cell housing. Referring to FIG. 4 and FIG.
  • the accommodating portion 2031 includes a first surface 2033 oppositely disposed along the first direction, and a second surface 2034 connecting the first surface 2033 and the sealing portion 2032 .
  • the accommodating part 2031 and the sealing part 2032 are arranged along a second direction, and the second direction is perpendicular to the first direction.
  • the battery module 20 includes a first battery cell 201 and a second battery cell 202 that are disposed adjacent to each other. Further, the battery module 20 includes a third battery cell 203 and a fourth battery cell 204 arranged adjacently, and the second battery cell 202 and the third battery cell 203 are arranged adjacently.
  • the first cell 201 includes a first tab 2051
  • the second cell 202 includes a second tab 2052
  • the third cell 203 includes a third tab 2053
  • the fourth cell The core includes a fourth tab 2054 .
  • first tab 2051 and the second tab 2052 are positive tabs
  • the negative tab of the first cell 201 and the negative tab of the second cell 202 are connected by welding
  • the first The cell 201 and the second cell 202 are connected in parallel.
  • the third tab 2053 and the fourth tab 2054 are negative tabs
  • the positive tab of the third cell 203 and the positive tab of the fourth cell 204 are welded and connected
  • the third cell 203 and the fourth battery cell 204 is connected in parallel.
  • the first cell 201 and the second cell 202 are connected in parallel to form a cell group
  • the third cell 203 and the fourth cell 204 are connected in parallel to form a cell group.
  • a series connection is formed between the two through the conductive sheet 60, thereby obtaining a battery module that is connected in parallel and in series.
  • the structure of the battery modules in parallel and then in series can reduce the use of foam, U-shaped copper bars or "mouth"-shaped copper bars. On the premise of ensuring stability and strength, it not only simplifies the structure, but also reduces the consumption of raw materials. use.
  • a fixing plate 30 is provided on one side of the battery module 20 , and the fixing plate 30 includes a main body portion 300 arranged along the first direction.
  • the main body 300 is provided with a first hole 301 penetrating the fixing plate 30 , and a first receiving groove 302 communicating with the first hole 301 . side.
  • the first hole 301 is used for the first tab 2051 and the second tab 2052 to pass through the fixing plate 30 .
  • the first receiving groove 302 is provided with a first inclined portion 3020.
  • the first inclined portion 3020 is disposed at an inclined angle relative to the first direction. The inclined angle is greater than 0 degrees and less than 180 degrees, and the inclination angle is not equal to 90 degrees. .
  • the first inclined portion 3020 is connected to the main body portion 300 .
  • the fixing plate is integrally formed by an injection molding process, and the first inclined portion 3020 and the main body portion 300 are integrally formed.
  • the first inclined portion 3020 may be detachably connected to the main body portion 300 .
  • the first bent portion 2081 of the first tab 2051 and the second bent portion 2082 of the second tab 2052 are disposed in the first receiving groove 302 .
  • the inclined portion 3020 is in contact connection.
  • the first inclined portion 3020 is used to guide the portion of the first tab 2051 extending out of the cell housing 206 during the manufacturing process, so that the portion of the first tab 2051 is bent to form the first bent portion 2081 .
  • the first welding portion 2091 of the first tab 2051 and the second welding portion 2092 of the second tab 2052 are welded and fixed.
  • the cross-sectional shape of the first inclined portion 3020 is a triangle or a circular arc, and its cross-sectional shape can smoothly transition the tab 205 from the second direction (vertical direction) to the first direction (horizontal direction), thereby starting the To the role of the guide, reduce the use of the tab bending jig. It can be understood that the cross-sectional shape of the first inclined portion 3020 may also be other shapes suitable for guiding the tabs.
  • the first inclined portion 3020 also has the function of supporting the fixing plate 30 . Compared with the technical means of adding foam between the cells to limit the position of the tabs in the prior art, the arrangement of the first inclined portion 3020 can reduce the use of foam and reduce the cost.
  • the first inclined portion 3020 includes a first left inclined portion 3021 and a first right inclined portion 3022 disposed opposite to each other.
  • a bent portion 2081 is in contact and connected, the first right inclined portion 3022 is in contact with the second bent portion 2082, the first left inclined portion 3021 is inclined at an obtuse angle along the first direction, and the first right inclined portion 3022 Inclined at an acute angle in the first direction.
  • the obtuse angle is in the range of 135 degrees to 140 degrees
  • the acute angle is in the range of 40 degrees to 45 degrees.
  • the obtuse angle range and the acute angle range are beneficial to make the tabs easier to bend during the manufacturing process and improve the manufacturing efficiency.
  • the first left inclined portion 3021 and the first right inclined portion 3022 are symmetrical in structure, for example, the first left inclined portion 3021 is inclined at 140 degrees in the first direction, and the first right inclined portion 3022 is inclined along the first direction One direction is inclined at 40 degrees.
  • the part of the tab 205 extending out of the battery cell housing 206 is generally disposed along the second direction, and the first left inclined portion 3021 is used to The portion of the first tab 2051 extending out of the cell housing 206 is guided, so that the portion of the first tab 2051 is bent to form the first bent portion 2081 .
  • the first right inclined portion 3022 is used to guide the portion of the second tab 2052 extending out of the cell housing 206 during the manufacturing process, so that the portion of the second tab 2052 is bent to form the second bent portion 2082 .
  • the fixing plate 30 includes a main body portion 300 disposed along the first direction, the main body portion 300 is provided with a second hole 304 penetrating the fixing plate 30 and communicating with the second hole 304
  • the second accommodating groove 303 is disposed on the side of the fixing plate 30 close to the battery module 20 .
  • the second hole 304 is used for the third tab 2053 and the fourth tab 2054 to pass through the fixing plate 30 .
  • a second inclined portion 3030 is provided in the second receiving groove 303 .
  • the second inclined portion 3030 is connected to the main body portion 300 .
  • the fixing plate 30 is integrally formed by an injection molding process, and the plurality of second inclined portions 3030 are connected to the main body portion 300 in an integrally formed structure.
  • the second inclined portion 3030 may be detachably connected to the main body portion 300 .
  • the third bent portion 2083 of the third tab 2053 and the fourth bent portion 2084 of the fourth tab 2054 are disposed in the second receiving groove 303 , and the third bent portion 2083 and the second The inclined portion 3030 is connected in contact, and the fourth bent portion 2084 is connected with the second inclined portion 3030 in contact.
  • the third welding portion 2093 of the third tab 2053 and the fourth welding portion 2094 of the fourth tab 2054 are welded and fixed.
  • the cross-sectional shape of the second inclined portion 3030 is a triangle or a circular arc, and its cross-sectional shape can smoothly transition the tab 205 from the second direction (vertical direction) to the first direction (horizontal direction), thereby starting the To the role of the guide, reduce the use of the tab bending jig. It can be understood that the cross-sectional shape of the second inclined portion 3030 may also be other shapes suitable for guiding the tabs 205 . In addition to the guiding function, the second inclined portion 3030 also has the function of supporting the fixing plate 30 . The arrangement of the second inclined portion 3030 can reduce the use of foam and reduce the cost.
  • the second inclined portion 3030 includes a second left inclined portion 3031 and a second right inclined portion 3032 disposed opposite to each other.
  • the three bending parts 2083 are in contact and connection, and the second right inclined part 3032 is in contact and connection with the fourth bending part 2084 .
  • the second left inclined portion 3031 is inclined at an obtuse angle along the first direction
  • the second right inclined portion 3032 is inclined at an acute angle along the first direction.
  • the obtuse angle is in the range of 135 degrees to 140 degrees
  • the acute angle is in the range of 40 degrees to 45 degrees.
  • the obtuse angle range and the acute angle range are beneficial to make the tabs easier to bend during the manufacturing process and improve the manufacturing efficiency.
  • the second left inclined portion 3031 and the second right inclined portion 3032 are symmetrical in structure, for example, the second left inclined portion 3031 is inclined at 140 degrees in the first direction, and the second right inclined portion 3032 is inclined along the first direction One direction is inclined at 40 degrees.
  • the part of the tabs 205 extending out of the battery cell housing 206 is generally arranged along the second direction, and the second left inclined portion 3031 is used for aligning the battery cells during the manufacturing process.
  • the portion of the third tab 2053 extending out of the cell housing 206 is guided, so that the portion of the third tab 2053 is bent to form a third bent portion 2083 .
  • the second right inclined portion 3032 is used to guide the portion of the fourth tab 2054 extending out of the cell housing during the manufacturing process, so that the portion of the fourth tab 2054 is bent to form the fourth bent portion 2084 .
  • the fixing plate 30 includes a first left connecting portion 3023 and a first right connecting portion 3024.
  • the first left connecting portion 3023 and the first right connecting portion 3024 are located along the Two-way setting.
  • the first left connecting part 3023 and the first right connecting part 3024 are connected to the main body part 300 .
  • the fixing plate 30 is integrally formed through an injection molding process, and the first left connecting portion 3023 , the first right connecting portion 3024 and the main body portion 300 are integrally formed.
  • the first left connecting portion 3023 is connected to the first left inclined portion 3021 .
  • the first left connecting portion 3023 is in contact with the sealing portion 2032 of the first cell 201 .
  • the first right connecting portion 3024 is connected with the first right inclined portion 3022 , and the first right connecting portion 3024 is connected in contact with the sealing portion 2032 of the second cell 202 .
  • the fixing plate 30 includes a second left connecting portion 3033 and a second right connecting portion 3034 .
  • the second left connecting portion 3033 and the second right connecting portion 3034 are arranged along the second direction.
  • the second left connecting part 3033 and the second right connecting part 3034 are connected to the main body part 300 .
  • the fixing plate 30 is integrally formed by an injection molding process, and the second left connecting portion 3033 , the second right connecting portion 3034 and the main body portion 300 are integrally formed.
  • the second left connecting portion 3033 is connected with the second left inclined portion 3031 , and the second left connecting portion 3033 is connected in contact with the sealing portion 2032 of the third cell 203 .
  • the second right connecting portion 3034 is connected with the second right inclined portion 3032 , and the second right connecting portion 3034 is connected in contact with the sealing portion 2032 of the fourth cell 204 .
  • a first horizontal portion 3025 extends from one end of the first right connecting portion 3024 close to the cell.
  • the first horizontal portion 3025 is disposed along the first direction.
  • a second horizontal portion 3035 extends from one end of the second left connecting portion 3033 close to the cell, and the first horizontal portion 3025 is disposed in a direction opposite to the first direction.
  • the first horizontal portion 3025 is connected to the second surface 2034 of the second cell 202
  • the second horizontal portion 3035 is connected to the second surface 2034 of the third cell 203 .
  • the first horizontal portion 3025 and the second horizontal portion 3035 are respectively contacted and connected to the second surface 2034 of the adjacent cell.
  • the first horizontal part 3025 and the second horizontal part 3035 are in contact and connected, and the part of the contact connection extends between the first surface 2033 of the second cell 202 and the first surface 2033 of the third cell 203 .
  • the fixing plate 30 is integrally formed by an injection molding process, and the first horizontal portion 3025 , the second horizontal portion 3035 , the first right connecting portion 3024 , the second left connecting portion 3033 and the main body portion 300 are integrally formed.
  • the first right connecting portion 3024 has a first lateral portion 3026 extending from one end away from the cell, and the first lateral portion 3026 is in contact with the first right inclined portion 3022 .
  • the second left inclined portion 3031 has a second lateral portion 3036 extending from one end away from the cell, and the second lateral portion 3036 is in contact with the second left inclined portion 3031 .
  • the first hole 301 is provided between the first transverse portion 3026 and the second transverse portion 3036 .
  • the first transverse portion 3026 and the second transverse portion 3036 are connected to the main body portion 300 .
  • the fixing plate 30 is integrally formed by an injection molding process, and the first transverse portion 3026 , the second transverse portion 3036 and the main body portion 300 are integrally formed.
  • the shape of the first right connecting portion 3024, the first horizontal portion 3025, the second horizontal portion 3035 and the second left connecting portion 3033 can fit the shape of the cell head, and can restrict the cells connected in series in the first direction (that is, the thickness direction of the cell, the extension direction of the fixing plate 30), to avoid short-circuiting, reduce the use of foam, reduce the number of parts and assembly stations, and reduce costs.
  • first horizontal portion 3025 and the second horizontal portion 3035 are respectively in contact with the second surface 2034 of the adjacent cell, which can press the cell to be fixed and limited; the first horizontal portion 3025 and the second horizontal portion 3025 and the second The contact connection part of the horizontal part 3035 is extended between the first surfaces 2033 of the adjacent cells, which can maximize the contact area, reduce the pressure on the cells, and prevent damage to the cells.
  • the fixing plate 30 includes a slot 305 disposed between the first right connecting portion 3024 and the second left connecting portion 3033 , and the slot 305 is disposed in the first receiving groove 302 and the second receiving groove 302 between the grooves 303 .
  • the slot 305 is a cavity formed by the first transverse portion 3026 , the first right connecting portion 3024 , the first horizontal portion 3025 , the second horizontal portion 3035 , the second left connecting portion 3033 and the second transverse portion 3036 .
  • the slot 305 is recessed toward the battery module 20 .
  • the structure of the slot 305 ensures the consistency of the extension portions of the first horizontal portion 3025 and the second horizontal portion 3035, avoids poor flow of the plastic material during the injection molding process, and facilitates injection molding of the extension portion.
  • the conductive sheet 60 covers the slot 305 .
  • ribs (not shown) can be provided on the first lateral portion 3026 and the second lateral portion 3036 , and the ribs can ensure the strength and support the conductive sheet 60 .
  • the heat dissipation at the position of the conductive sheet 60 can also be increased.
  • the conductive sheet 60 can be a copper sheet or other elements with conductive function.
  • part of the slot is covered with a conductive sheet.
  • the fixing plate is provided with an opening 306 and a resin layer (not shown) disposed in the first receiving groove 302 , the opening 306 communicates with the first receiving groove 302 , and the opening The hole 306 is used for injecting resin into the first receiving groove 302 .
  • a resin layer is formed, and the resin is used for fixing the battery core and the fixing plate 30 .
  • the number and shape of the openings 306 can be increased, decreased or modified according to the actual glue filling amount.
  • the opening 306 cooperates with the shape of the first receiving groove 302 to guide the glue, so that the glue can smoothly flow into the head of the battery cell, and make full use of the glue to fix the tabs of the battery core.
  • FIG. 10 is a schematic diagram of the structure of the upper cover 105 , and a plurality of first buckles 107 are provided on the bottom surface of the upper cover 105 .
  • a plurality of second buckles 108 are provided on the fixing plate 30 at positions corresponding to the plurality of first buckles 107 .
  • a plurality of through holes 106 are formed on the top surfaces of the first sidewall 103 and the second sidewall 104 .
  • the first buckle 107 is fastened to the second buckle 108 through the through hole 106 .
  • an integrated battery management unit 40 and an insulating member 50 are arranged between the upper cover 105 and the fixing plate 30 in sequence.
  • the integrated battery management unit 40 , the insulating member 50 and the fixing plate 30 The connection between the first buckle 107 and the second buckle 108 is fastened.
  • the bottom surface of the upper cover 105 is provided with a first buckle 107
  • the fixing plate 30 is provided with a second buckle 108
  • the first buckle 107 passes through the through holes on the first side wall 103 and the second side wall 104 106 is fastened with the second buckle 108, so as to fasten the integrated battery management unit 40, the insulating member 50 and the fixing plate 30, which facilitates the assembly of the battery pack, reduces the number of screws, and simplifies the structure of the battery module, and the upper cover 105
  • the snap-fastening method can protect the integrated battery management unit 40.
  • the inner surfaces of the first sidewall 103 and the second sidewall 104 are pasted or sprayed with an insulating layer 109 , and the inner surfaces of the first sidewall 103 and the second sidewall 104 are Foam 70 on top and bottom.
  • the insulating layer 109 can be formed of a polycarbonate sheet (PC sheet), and the polycarbonate sheet can be fixed on the inner surfaces of the first side wall 103 and the second side wall 104 by means of adhesive, and the inner surface Glue grooves may be opened to accommodate glue to secure the polycarbonate sheet.
  • the insulating layer 109 can also be formed by spraying insulating powder.
  • the insulating layer 109 can insulate the battery module 20 from the first sidewall 103 and the second sidewall 104 to prevent leakage.
  • the present application also provides a method for manufacturing a battery pack, comprising the following steps:
  • the battery module manufacturing method stacking a plurality of battery cells along the first direction, and using a fixture to shape the welding parts 209 of the tabs 205 of the adjacent battery cells to obtain the battery module 20;
  • Install the fixing plate install the fixing plate 30 on the battery module 20, and make the bending part 208 of the tab 205 bend and fit the inclined part by the action of the inclined part on the fixing plate 30, and the welding part 209 of the tab 205 extends the first hole 301 of the fixing plate.
  • the manufacturing method further includes welding: bending the welding portion 209 , and welding the bent welding portion 209 to the conductive sheet 60 on the fixing plate 30 .
  • the stacking and arranging the plurality of battery cells along the first direction includes: stacking every two battery cells in a manner that the positive electrode ear is aligned with the positive electrode ear and the negative electrode ear is aligned with the negative electrode ear to form a plurality of battery cell groups,
  • the plurality of battery cell groups are stacked in a manner that the positive electrode lugs are aligned with the negative electrode lugs, and the negative electrode lugs are aligned with the positive electrode lugs.
  • the cells are stacked through foam 70 , the cell groups are stacked through foam 70 , and the two sides and bottom of the battery module 20 are pasted with foam 70 .
  • the manufacturing method further includes: disposing the insulating member 50 on the fixing plate 30 , and then installing the integrated battery management unit 40 on the insulating member 50 , and fixing by bolts.
  • the manufacturing method further includes: installing the first end plate 101 and the second end plate 102 on both sides of the battery module 20 in the first direction through the foam 70; on the first side wall 103 and the second side
  • the inner surface of the wall 104 is pasted with the foam 70 and the insulating layer 109, and then the first side wall 103 and the second side wall 104 are installed on both sides of the battery module 20;
  • the upper cover 105 is installed, and the bottom surface of the upper cover is provided with a first Buckle 107
  • the fixing plate 30 is provided with a second buckle 108
  • the first buckle 107 passes through the through holes 106 on the first side wall 103 and the second side wall 104 and is fastened to the second buckle 108 .
  • a corresponding fixing plate is designed to position and fix the cells, and the cells are connected in parallel and then in series.
  • the design structure reduces the use of copper bars such as foam, U-shaped copper bars or "mouth"-shaped copper bars;
  • the fixing plate is provided with a structure similar to the outer surface of the cell, which can fix the position of the cell to avoid short Connect and reduce the pressure on the battery core to protect the battery core, and at the same time reduce the use of foam;
  • a plurality of inclined parts are arranged in the receiving groove for guiding the tabs, which is convenient for the installation of the tabs.
  • the battery pack and its manufacturing method provided by the present application have a simple structure, can reduce the use of materials such as foam and copper bars, and at the same time improve the strength and stability of the battery pack structure.

Abstract

本申请提供一种电池组及其制造方法，在沿电芯的厚度方向堆叠的情况下，设计相应的固定板对电芯进行定位及固定，电芯之间形成先并联后串联的电连接关系，该设计结构减少了泡棉、U型铜排或"口"字型等铜排的使用；并且，在固定板上设有与电芯的外表面形状相仿的结构，可固定电芯位置避免短接并减少对电芯的压力以保护电芯，同时减少了泡棉的使用；另外，在收容槽内设有多个倾斜部，用于对极耳进行导向，便于极耳的安装。本申请提供的电池组及其制造方法，结构简单，可减少泡棉以及铜排等材料的使用，提升了电池组结构的强度及稳定性。

Description

电池组及其制造方法 技术领域
本申请涉及一种电池组及其制造方法。
背景技术
电池组的开发需要考虑多方面的因素，在确保安全前提下提升电池组的各项性能，比如在减少内部结构零件的支持前提下提升电池组结构的稳定性及强度。现有的电池组一般设置较为复杂的连接结构，以满足电池模组的强度，造成生产工艺复杂且成本较高。
例如，现有的电池组采用先分别串联成多个小模组，再将各个小模组利用铜排进行并联的方式。此方式存在以下不足：在极耳折弯过程中，需利用专用夹具先固定住极耳，然后再进行折弯；极耳之间还需采用泡棉进行限位填充，以对极耳进行固定，避免短接。上述方法增加了泡棉及铜排的使用，增加了零件数量及装配的工序；专用夹具的使用，也增加了加工生产成本。
发明内容
有鉴于此，本申请提供一种电池组，该电池模组的结构简单，可减少泡棉以及铜排等材料的使用，同时还提升了电池模组结构的稳定性及强度。
本申请的技术方案是：一种电池组，包括电池组壳体和收容于所述电池组壳体内的电池模组，所述电池模组包括多个沿第一方向堆叠设置的电芯，每个电芯包括电芯壳体和极耳，极耳包括设于所述电芯壳体外的焊接部和弯折部。其中，所述电池模组包括相邻设置的第一电芯和第二电芯，所述第一电芯包括第一极耳，所述第二电芯包括第二极耳。所述电池模组的一侧设有固定板，所述固定板包括沿第一方向设置的主体部，所述主体部设有贯穿固定板的第一孔和与所述第一孔连通的第一收容槽，所述第一收容槽设于固定板靠近所述电池模组的一侧，所述第一孔用于第一极耳和第二极耳穿过所述固定板。所述第一收容槽内设有第一倾斜部，第一倾斜部相对第一方向以倾斜角设置，所述倾斜角大于0度。所述第一极耳的第一弯折部和所述第二极耳的第二弯折部设于所述第一收容槽，所述第一弯折部和第一倾斜部接触连接。所述第一极耳的第一焊接部和所述第二极耳的第二焊接部焊接固定。
一种实施方式中，所述电池模组包括相邻设置的第三电芯和第四电芯，所述第二电芯和所述第三电芯相邻设置。所述第三电芯包括第三极耳，第四电芯包括第四极耳。所述主体部设有贯穿固定板的第二孔和与所述第二孔连通的第二收容槽，所述第二收容槽设于固定板靠近所述电池模组的一侧，所述第二孔用于第三极耳和第四极耳穿过所述固定板。所述第二收容槽内设有第二倾斜部，所述第三极耳的第三弯折部和所述第四极耳的第四弯折部设于所述第二收容槽，所述第三弯折部和第二倾斜部接触连接。所述第三极耳的第三焊接部和所述第四极耳的第四焊接部焊接固定。所述电池组包括设于固定板的多个导电片，所述第一焊接部、所述第二焊接部焊、所述第三焊接部和所述第四焊接部焊接于同一个所述导电片。
一种实施方式中，所述第一极耳和所述第二极耳为正极耳，所述第一电芯和 所述第二电芯并联连接。所述第三极耳和所述第四极耳为负极耳，所述第三电芯和所述第四电芯并联连接。
一种实施方式中，所述电芯壳体包括容纳所述电芯的电极组件的容纳部和从所述容纳部的周缘向外延伸的密封部，容纳部包括沿沿第一方向相对设置的第一表面、连接第一表面和密封部的第二表面，所述极耳自所述密封部延伸出电芯壳体。
一种实施方式中，所述第一倾斜部包括相对设置的第一左倾斜部和第一右倾斜部，所述第一左倾斜部与第一弯折部接触连接，所述第一右倾斜部与第二弯折部接触连接，所述第一左倾斜部沿第一方向以钝角倾斜，所述第一右倾斜部沿第一方向以锐角倾斜。
一种实施方式中，所述钝角的范围为135度-140度，所述锐角的范围为40度-45度。
一种实施方式中，所述固定板包括第一左连接部和第一右连接部。所述第一左连接部和第一左倾斜部连接，所述第一左连接部和第一电芯的密封部接触连接。所述第一右连接部和第一右倾斜部连接，所述第一右连接部和第二电芯的密封部接触连接。
一种实施方式中，所述第二倾斜部包括相对设置的第二左倾斜部和第二右倾斜部，所述第二左倾斜部与第三弯折部接触连接，所述第二右倾斜部与第四弯折部接触连接，所述第二左倾斜部沿第一方向以所述钝角倾斜，所述第二右倾斜部沿第一方向以所述锐角倾斜。
一种实施方式中，所述固定板包括第二左连接部和第二右连接部。所述第二左连接部和第二左倾斜部连接，所述第二左连接部和第三电芯的密封部接触连接。所述第二右连接部和第二右倾斜部连接，所述第二右连接部和第四电芯的密封部接触连接。
一种实施方式中，所述第一右连接部在靠近电芯的一端延伸有第一水平部，所述第二左连接部在靠近电芯的一端延伸有第二水平部，所述第一水平部与第二电芯的第二表面连接，所述第二水平部与第三电芯的第二表面连接。
一种实施方式中，所述第一水平部和所述第二水平部接触连接，所述接触连接的部分延伸设置在第二电芯的第一表面和第三电芯的第一表面之间。
一种实施方式中，所述第一右连接部在远离电芯的一端延伸有第一横向部，所述第一横向部与所述第一右倾斜部接触连接。所述第二左连接部在远离电芯的一端延伸有第二横向部，所述第二横向部与所述第二左倾斜部接触连接。
一种实施方式中，所述固定板包括设于第一右连接部和第二左连接部之间的开槽，所述开槽设置在第一收容槽和第二收容槽之间，所述导电片覆盖所述开槽。
一种实施方式中，所述固定板设有开孔和设于第一收容槽的树脂层，所述开孔与所述第一收容槽连通，所述开孔用于将树脂注入到第一收容槽，所述树脂固定后形成树脂层，所述树脂用于将电芯和固定板固定。
本申请还提供一种电池组的制造方法，其包括如下步骤：
电池模组制造方法：将多个电芯沿第一方向堆叠设置，借助工装夹具对相邻电芯的极耳的焊接部进行归拢整形，得到电池模组；
安装固定板：将固定板安装在电池模组上，借助固定板上倾斜部的作用使得极耳的弯折部弯折并贴合倾斜部，极耳的焊接部伸出固定板的第一孔。
一种实施方式中，所述将多个电芯沿第一方向堆叠设置包括：将每两个电芯按照正极耳对齐正极耳、负极耳对齐负极耳的方式进行堆叠，形成多个电芯组， 将所述多个电芯组按照正极耳对齐负极耳、负极耳对齐正极耳的方式进行堆叠。
一种实施方式中，所述电芯之间通过泡棉进行堆叠，所述电芯组之间通过泡棉进行堆叠，所述电池模组的两侧以及底部粘贴泡棉。
一种实施方式中，所述制造方法还包括将绝缘件设置在固定板上，再在绝缘件上安装集成电池管理单元，并通过螺栓进行固定。
一种实施方式中，所述制造方法还包括焊接步骤，将所述焊接部进行折弯，并将折弯后的焊接部焊接于固定板上的导电片。
本申请提供的电池组及其制造方法，在沿电芯的厚度方向堆叠的情况下，设计相应的固定板对电芯进行定位及固定，电芯之间形成先并联后串联的电连接关系，该设计结构减少了泡棉、U型铜排或“口”字型等铜排的使用；并且，在固定板上设有与电芯的外表面形状相仿的结构，可固定电芯位置避免短接并减少对电芯的压力以保护电芯，同时减少了泡棉的使用；另外，在收容槽内设有多个倾斜部，用于对极耳进行导向，便于极耳的安装。本申请提供的电池组及其制造方法，结构简单，可减少泡棉以及铜排等材料的使用，同时还提升了电池组结构的强度及稳定性。
附图说明
下面结合附图和具体实施方式对本申请作进一步详细的说明。
图1为本申请一实施例提供的电池组的爆炸图。
图2为图1中所示电池组的部分结构示意图。
图3为图1中固定板和电池模组的结构示意图。
图4为图3中电芯的结构示意图。
图5为图3中A处的放大图。
图6为图3中固定板的剖视图。
图7为图3中固定板的俯视图。
图8为图3中固定板的仰视图。
图9为图3中电芯极耳与导电片连接的示意图。
图10为图1中所示上盖的结构示意图。
图11为图1中所示第一侧壁和第二侧壁的内表面结构示意图。
主要元件符号说明：
电池组壳体               10
电池模组                 20
固定板                   30
集成电池管理单元         40
绝缘件                   50
导电片                   60
泡棉                     70
第一端板                 101
第二端板                 102
第一侧壁                 103
第二侧壁                 104
上盖                     105
通孔                     106
第一卡扣                 107
第二卡扣                 108
绝缘层                   109
第一电芯                 201
第二电芯                 202
第三电芯                 203
第四电芯                 204
极耳                     205
电芯壳体                 206
电极组件                 207
弯折部                   208
焊接部                   209
主体部                   300
第一孔                   301
第一收容槽               302
第二收容槽               303
第二孔                   304
开槽                     305
开孔                     306
容纳部                   2031
密封部                   2032
第一表面                 2033
第二表面                 2034
第一极耳                 2051
第二极耳                 2052
第三极耳                 2053
第四极耳                 2054
第一弯折部               2081
第二弯折部               2082
第三弯折部               2083
第四弯折部               2084
第一焊接部               2091
第二焊接部               2092
第三焊接部               2093
第四焊接部               2094
第一倾斜部               3020
第一左倾斜部             3021
第一右倾斜部             3022
第一左连接部             3023
第一右连接部             3024
第一水平部               3025
第一横向部               3026
第二倾斜部               3030
第二左倾斜部             3031
第二右倾斜部             3032
第二左连接部             3033
第二右连接部             3034
第二水平部               3035
第二横向部               3036
如下具体实施方式将结合上述附图进一步说明本申请实施例。
具体实施方式
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请实施例的技术领域的技术人员通常理解的含义相同。本文中所使用的术语只是为了描述具体的实施方式的目的，不是旨在于限制本申请实施例。
需要说明，本申请实施例中所有方向性指示(诸如上、下、左、右、前、后……)仅用于解释在某一特定姿态(如附图所示)下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本申请中如涉及“第一”“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”“第二”的特征可以明示或者隐含地包括至少一个该特征。在本申请的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本申请中，除非另有明确的规定和限定，术语“连接”“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
请参阅图1至图3，图1为本申请一实施例提供的电池组的爆炸图，图2为图1中所示的电池组的部分结构示意图，图3为图1中固定板30和电池模组20的结构示意图。所述电池组包括电池组壳体10和收容于所述电池组壳体10内的电池模组20。所述电池组壳体10包括相对设置的第一端板101和第二端板102、相对设置的第一侧壁103和第二侧壁104以及上盖105。所述第一端板101、所述第二端板102、所述第一侧壁103和所述第二侧壁104合围形成一空腔(图未示)，所述电池模组20收容于所述空腔中，所述上盖105封盖所述空腔的一端。所述上盖105和固定板30之间依次设有集成电池管理单元(BMU)40和绝缘件50，优选的，所述绝缘件50可以为聚碳酸酯(PC)片。
请参阅图3，所述电池模组20包括多个沿第一方向堆叠设置的电芯。优选的，所述第一方向为电芯的厚度方向，在图1中可理解为从第一端板101至第二端板102的方向，也即固定板30的延伸方向。所述电池模组20的一侧设有固定板30。
请参阅图4，电芯包括电芯壳体206、极耳205和电极组件207，极耳205包括设于所述电芯壳体206外的焊接部209和弯折部208，所述电芯壳体206包括容纳所述电极组件207的容纳部2031和从所述容纳部2031的周缘向外延伸的密封部2032，极耳205自所述密封部2032延伸出电芯壳体206。本实施例中，每个电芯包括两个极耳，一个正极耳和一个负极耳，所述两个极耳自电芯壳体的同一端延伸出电芯壳体。请参阅图4和图5，容纳部2031包括沿第一方向相对设置的第一表面2033、连接第一表面2033和密封部2032的第二表面2034。所 述容纳部2031和密封部2032沿第二方向设置，所述第二方向垂直第一方向。
请参阅图5，所述电池模组20包括相邻设置的第一电芯201和第二电芯202。进一步地，所述电池模组20包括相邻设置的第三电芯203和第四电芯204，所述第二电芯202和所述第三电芯203相邻设置。请参阅图9，所述第一电芯201包括第一极耳2051，所述第二电芯202包括第二极耳2052，所述第三电芯203包括第三极耳2053，第四电芯包括第四极耳2054。进一步地，所述第一极耳2051和所述第二极耳2052为正极耳，所述第一电芯201的负极耳和所述第二电芯202的负极耳焊接连接，所述第一电芯201和所述第二电芯202并联连接。所述第三极耳2053和所述第四极耳2054为负极耳，所述第三电芯203的正极耳和所述第四电芯204的正极耳焊接连接，所述第三电芯203和所述第四电芯204并联连接。所述第一电芯201和所述第二电芯202并联形一电芯组，所述第三电芯203和所述第四电芯204并联形成一电芯组，每一电芯组之间通过导电片60形成串联的连接关系，由此得到先并联和串联的电池模组。电池模组先并联后串联的结构，可减少泡棉、U型铜排或“口”字型铜排的使用，在保证稳定性及强度的前提下，既简化了结构，又减少了原料的使用。
请参阅图5和图6，所述电池模组20的一侧设有固定板30，固定板30包括沿第一方向设置的主体部300。所述主体部300设有贯穿固定板30的第一孔301、和与所述第一孔301连通的第一收容槽302，所述第一收容槽设于固定板30靠近电池模组20的一侧。所述第一孔301用于第一极耳2051和第二极耳2052穿过所述固定板30。所述第一收容槽302内设有第一倾斜部3020，第一倾斜部3020相对第一方向以倾斜角设置，所述倾斜角大于0度且小于180度，所述倾斜角不等于90度。优选的，第一倾斜部3020连接于主体部300。优选的，固定板通过注塑成型工艺一体成型，第一倾斜部3020和主体部300为一体成型结构。其它实施例中，第一倾斜部3020可以可拆卸的连接于主体部300。所述第一极耳2051的第一弯折部2081和所述第二极耳2052的第二弯折部2082设于所述第一收容槽302，所述第一弯折部2081和第一倾斜部3020接触连接。所述第一倾斜部3020用于在制造过程中对第一极耳2051延伸出电芯壳体206的部分进行引导，使得第一极耳2051的部分弯折从而形成第一弯折部2081。所述第一极耳2051的第一焊接部2091和所述第二极耳2052的第二焊接部2092焊接固定。所述第一倾斜部3020的截面形状为三角形或圆弧形，其截面形状可以顺滑地将极耳205从第二方向(竖直方向)到第一方向(水平方向)进行过度，从而起到导向的作用，减少极耳折弯夹具的使用。可以理解，所述第一倾斜部3020的截面形状也可以是其它适用于对极耳进行导向的形状。所述第一倾斜部3020除了具有导向作用外，还具有支撑固定板30的作用。与现有技术中在电芯间增加泡棉对极耳进行限位的技术手段相比，所述第一倾斜部3020的设置可减少泡棉的使用，降低成本。
进一步地，如图5、图6和图8所示，所述第一倾斜部3020包括相对设置的第一左倾斜部3021和第一右倾斜部3022，所述第一左倾斜部3021与第一弯折部2081接触连接，所述第一右倾斜部3022与第二弯折部2082接触连接，所述第一左倾斜部3021沿第一方向以钝角倾斜，所述第一右倾斜部3022沿第一方向以锐角倾斜。优选的，所述钝角范围为135度-140度，所述锐角范围为40度-45度，所述钝角的范围和锐角范围有利于在制造过程中时使极耳更易弯折，提高制造效率。优选的，所述第一左倾斜部3021和所述第一右倾斜部3022结构对称，比如所述第一左倾斜部3021沿第一方向140度倾斜，所述第一右倾斜部3022 沿第一方向以40度倾斜。所述电芯在未被制造成电池模组20前，极耳205延伸出电芯壳体206的部分大致上沿第二方向设置，所述第一左倾斜部3021用于在制造过程中对第一极耳2051延伸出电芯壳体206的部分进行引导，使得第一极耳2051的部分弯折从而形成第一弯折部2081。所述第一右倾斜部3022用于在制造过程中对第二极耳2052延伸出电芯壳体206的部分进行引导，使得第二极耳2052的部分弯折从而形成第二弯折部2082。
请参阅图5至图8，所述固定板30包括沿第一方向设置的主体部300，所述主体部300设有贯穿固定板30的第二孔304和与所述第二孔304连通的第二收容槽303，所述第二收容槽303设于固定板30靠近电池模组20的一侧。所述第二孔304用于第三极耳2053和第四极耳2054穿过所述固定板30。所述第二收容槽303内设有第二倾斜部3030。优选的，第二倾斜部3030连接于主体部300。优选的，固定板30通过注塑成型工艺一体成型，多个第二倾斜部3030连接于主体部300为一体成型结构。其它实施例中，第二倾斜部3030可以可拆卸的连接于主体部300。所述第三极耳2053的第三弯折部2083和所述第四极耳2054的第四弯折部2084设于所述第二收容槽303，所述第三弯折部2083和第二倾斜部3030接触连接，所述第四弯折部2084和第二倾斜部3030接触连接。所述第三极耳2053的第三焊接部2093和所述第四极耳2054的第四焊接部2094焊接固定。所述第二倾斜部3030的截面形状为三角形或圆弧形，其截面形状可以顺滑地将极耳205从第二方向(竖直方向)到第一方向(水平方向)进行过度，从而起到导向的作用，减少极耳折弯夹具的使用。可以理解，所述第二倾斜部3030的截面形状也可以是其它适用于对极耳205进行导向的形状。所述第二倾斜部3030除了具有导向作用外，还具有支撑固定板30的作用。所述第二倾斜部3030的设置可减少泡棉的使用，降低成本。
进一步地，如图5、图6和图8所示，所述第二倾斜部3030包括相对设置的第二左倾斜部3031和第二右倾斜部3032，所述第二左倾斜部3031与第三弯折部2083接触连接，所述第二右倾斜部3032与第四弯折部2084接触连接。所述第二左倾斜部3031沿第一方向以钝角倾斜，所述第二右倾斜部3032沿第一方向以锐角倾斜。优选的，所述钝角范围为135度-140度，所述锐角范围为40度-45度，所述钝角的范围和锐角范围有利于在制造过程中时使极耳更易弯折，提高制造效率。优选的，所述第二左倾斜部3031和所述第二右倾斜部3032结构对称，比如所述第二左倾斜部3031沿第一方向140度倾斜，所述第二右倾斜部3032沿第一方向以40度倾斜。所述电芯在未被制造成电池模组20前，极耳205延伸出电芯壳体206的部分大致上沿第二方向设置，所述第二左倾斜部3031用于在制造过程中对第三极耳2053延伸出电芯壳体206的部分进行引导，使得第三极耳2053的部分弯折从而形成第三弯折部2083。所述第二右倾斜部3032用于在制造过程中对第四极耳2054延伸出电芯壳体的部分进行引导，使得第四极耳2054的部分弯折从而形成第四弯折部2084。
请参阅图5和图6，所述固定板30包括第一左连接部3023和第一右连接部3024，优选的，所述第一左连接部3023和所述第一右连接部3024沿第二方向设置。优选的，第一左连接部3023和第一右连接部3024连接于主体部300。优选的，固定板30通过注塑成型工艺一体成型，第一左连接部3023、第一右连接部3024和主体部300为一体成型结构。所述第一左连接部3023和第一左倾斜部3021连接。所述第一左连接部3023和第一电芯201的密封部2032接触连接。所述第一右连接部3024和第一右倾斜部3022连接，所述第一右连接部3024和 第二电芯202的密封部2032接触连接。
进一步地，所述固定板30包括第二左连接部3033和第二右连接部3034。优选的，所述第二左连接部3033和所述第二右连接部3034沿第二方向设置。优选的，第二左连接部3033和第二右连接部3034连接于主体部300。优选的，固定板30通过注塑成型工艺一体成型，第二左连接部3033、第二右连接部3034和主体部300为一体成型结构。所述第二左连接部3033和第二左倾斜部3031连接，所述第二左连接部3033和第三电芯203的密封部2032接触连接。所述第二右连接部3034和第二右倾斜部3032连接，所述第二右连接部3034和第四电芯204的密封部2032接触连接。
所述第一右连接部3024在靠近电芯的一端延伸有第一水平部3025。优选的，第一水平部3025沿第一方向设置。所述第二左连接部3033在靠近电芯的一端延伸有第二水平部3035，第一水平部3025沿与第一方向相反的方向设置。所述第一水平部3025与第二电芯202的第二表面2034连接，所述第二水平部3035与第三电芯203的第二表面2034连接。优选的，所述第一水平部3025、所述第二水平部3035分别与相邻电芯的第二表面2034接触连接。所述第一水平部3025和所述第二水平部3035接触连接，所述接触连接的部分延伸设置在第二电芯202的第一表面2033和第三电芯203的第一表面2033之间。优选的，固定板30通过注塑成型工艺一体成型，第一水平部3025、第二水平部3035、第一右连接部3024、第二左连接部3033和主体部300为一体成型结构。所述第一右连接部3024在远离电芯的一端延伸有第一横向部3026，所述第一横向部3026和所述第一右倾斜部3022接触连接。所述第二左倾斜部3031在远离电芯的一端延伸有第二横向部3036，所述第二横向部3036与所述第二左倾斜部3031接触连接。优选的，第一孔301设于第一横向部3026和所述第二横向部3036之间。优选的，第一横向部3026、第二横向部3036连接于主体部300。优选的，固定板30通过注塑成型工艺一体成型，第一横向部3026、第二横向部3036和主体部300为一体成型结构。
所述第一右连接部3024、第一水平部3025、第二水平部3035和第二左连接部3033构成的形状可贴合电芯头部的外形，能够限制串联的电芯在第一方向(即电芯的厚度方向，固定板30的延伸方向)的位置，避免短接，同时减少了泡棉的使用，减少零件数量及装配工位，降低成本。并且，所述第一水平部3025、所述第二水平部3035分别与相邻电芯的第二表面2034接触连接，可压住电芯对其固定限位；第一水平部3025和第二水平部3035接触连接的部分延伸设置在相邻电芯的第一表面2033之间，可以最大程度地增大接触面积，减少对电芯的压力，防止对电芯造成损伤。
如图6所示，所述固定板30包括设于第一右连接部3024和第二左连接部3033之间的开槽305，所述开槽305设置在第一收容槽302和第二收容槽303之间。所述开槽305由第一横向部3026、第一右连接部3024、第一水平部3025、第二水平部3035、第二左连接部3033和第二横向部3036所构成的空腔，所述开槽305朝向所述电池模组20凹陷。所述开槽305的结构保证了第一水平部3025和第二水平部3035延伸部分的一致性，避免在注塑过程中塑胶料的流动不畅，方便延伸部分的注塑成型。所述导电片60覆盖所述开槽305，具体的，可在第一横向部3026和第二横向部3036上设置肋板(图未示)，所述肋板在保证强度及支撑导电片60的同时，也可增加导电片60位置处的散热。所述导电片60可为铜片或其它具有导电作用的元件。优选的，部分开槽覆盖有导电片。
如图7所示，所述固定板设有开孔306和设于第一收容槽302的树脂层(图未示)，所述开孔306与所述第一收容槽302连通，所述开孔306用于将树脂注入到第一收容槽302，所述树脂固定后形成树脂层，所述树脂用于将电芯和固定板30固定。所述开孔306的数量及形状可根据实际的灌胶量进行增减或修改。所述开孔306配合所述第一收容槽302的形状能对胶水进行导流，让胶水顺利流入到电芯的头部，充分利用胶水以对电芯的极耳进行固定。
请参阅图10，为上盖105的结构示意图，所述上盖105的底面上设有多个第一卡扣107。请参阅图7，固定板30上对应于多个所述第一卡扣107的位置设有多个第二卡扣108。请参阅图2，第一侧壁103和第二侧壁104的顶面设有多个通孔106。所述第一卡扣107穿过所述通孔106和所述第二卡扣108紧固连接。请参阅图1，所述上盖105和所述固定板30之间依次设有集成电池管理单元40和绝缘件50，所述集成电池管理单元40、所述绝缘件50与所述固定板30之间通过所述第一卡扣107和所述第二卡扣108的连接进行紧固。具体的，上盖105的底面设有第一卡扣107，固定板30上设置有第二卡扣108，第一卡扣107穿过第一侧壁103和第二侧壁104上的通孔106与第二卡扣108紧固，从而将集成电池管理单元40、绝缘件50和固定板30紧固，方便电池组的组装，减少螺钉数量，简化了电池模组的结构，并且上盖105的卡扣扣紧方式可对集成电池管理单元40进行防护。
请参阅图11，所述第一侧壁103和所述第二侧壁104的内表面粘贴或喷涂有绝缘层109，所述第一侧壁103和所述第二侧壁104的内表面的顶部和底部均设有泡棉70。所述绝缘层109可由聚碳酸酯片(PC片)形成，所述聚碳酸酯片可采用粘胶方式固定于所述第一侧壁103和第二侧壁104的内表面，所述内表面可开设胶槽以容纳胶水固定所述聚碳酸酯片。或者，所述绝缘层109也可由喷涂绝缘粉形成。所述绝缘层109可将电池模组20与第一侧壁103和第二侧壁104进行绝缘，防止漏电。
本申请还提供一种电池组的制造方法，包括如下步骤：
电池模组制造方法：将多个电芯沿第一方向堆叠设置，借助工装夹具对相邻电芯的极耳205的焊接部209进行归拢整形，得到电池模组20；
安装固定板：将固定板30安装在电池模组20上，借助固定板30上倾斜部的作用使得极耳205的弯折部208弯折并贴合倾斜部，极耳205的焊接部209伸出固定板的第一孔301。
进一步地，所述制造方法还包括焊接：将所述焊接部209进行折弯，并将折弯后的焊接部209焊接于固定板30上的导电片60。
进一步地，所述将多个电芯沿第一方向堆叠设置包括：将每两个电芯按照正极耳对齐正极耳、负极耳对齐负极耳的方式进行堆叠，形成多个电芯组，将所述多个电芯组按照正极耳对齐负极耳、负极耳对齐正极耳的方式进行堆叠。
所述电芯之间通过泡棉70进行堆叠，所述电芯组之间通过泡棉70进行堆叠，所述电池模组20的两侧以及底部粘贴泡棉70。
进一步地，所述制造方法还包括：将绝缘件50设置在固定板30上，再在绝缘件50上安装集成电池管理单元40，并通过螺栓进行固定。
进一步地，所述制造方法还包括：将第一端板101和第二端板102通过泡棉70安装在电池模组20在第一方向的两侧；在第一侧壁103和第二侧壁104的内表面粘贴泡棉70和绝缘层109，再将第一侧壁103和第二侧壁104安装在电池模组20的两侧；安装上盖105，上盖的底面设有第一卡扣107，固定板30上设 有第二卡扣108，第一卡扣107穿过第一侧壁103和第二侧壁104上的通孔106与第二卡扣108紧固。
本申请提供的电池组及其制造方法，在沿电芯的厚度方向堆叠的情况下，设计相应的固定板对电芯进行定位及固定，电芯之间形成先并联后串联的电连接关系，该设计结构减少了泡棉、U型铜排或“口”字型等铜排的使用；并且，在固定板上设有与电芯的外表面形状相仿的结构，可固定电芯位置避免短接并减少对电芯的压力以保护电芯，同时减少了泡棉的使用；另外，在收容槽内设有多个倾斜部，用于对极耳进行导向，便于极耳的安装。本申请提供的电池组及其制造方法，结构简单，可减少泡棉以及铜排等材料的使用，同时还提升了电池组结构的强度及稳定性。
以上实施方式仅用以说明本申请实施例的技术方案而非限制，尽管参照以上较佳实施方式对本申请实施例进行了详细说明，本领域的普通技术人员应当理解，可以对本申请实施例的技术方案进行修改或等同替换都不应脱离本申请实施例的技术方案的精神和范围。

Claims (19)

  1. 一种电池组，包括电池组壳体和收容于所述电池组壳体内的电池模组，所述电池模组包括多个沿第一方向堆叠设置的电芯，每个电芯包括电芯壳体和极耳，极耳包括设于所述电芯壳体外的焊接部和弯折部，其特征在于，
    所述电池模组包括相邻设置的第一电芯和第二电芯，所述第一电芯包括第一极耳，所述第二电芯包括第二极耳；
    所述电池模组的一侧设有固定板，所述固定板包括沿第一方向设置的主体部，所述主体部设有贯穿固定板的第一孔和与所述第一孔连通的第一收容槽，所述第一收容槽设于固定板靠近所述电池模组的一侧，所述第一孔用于第一极耳和第二极耳穿过所述固定板；所述第一收容槽内设有第一倾斜部，所述第一倾斜部相对第一方向以倾斜角设置，所述倾斜角大于0度；所述第一极耳的第一弯折部和所述第二极耳的第二弯折部设于所述第一收容槽，所述第一弯折部和第一倾斜部接触连接，所述第一极耳的第一焊接部和所述第二极耳的第二焊接部焊接固定。
  2. 如权利要求1所述的电池组，其特征在于，所述电池模组包括相邻设置的第三电芯和第四电芯，所述第二电芯和所述第三电芯相邻设置，所述第三电芯包括第三极耳，第四电芯包括第四极耳；
    所述主体部设有贯穿固定板的第二孔和与所述第二孔连通的第二收容槽，所述第二收容槽设于固定板靠近所述电池模组的一侧，所述第二孔用于第三极耳和第四极耳穿过所述固定板；所述第二收容槽内设有第二倾斜部，所述第三极耳的第三弯折部和所述第四极耳的第四弯折部设于所述第二收容槽，所述第三弯折部和第二倾斜部接触连接；所述第三极耳的第三焊接部和所述第四极耳的第四焊接部焊接固定；
    所述电池组包括设于固定板的多个导电片，所述第一焊接部、所述第二焊接部、所述第三焊接部和所述第四焊接部焊接于同一个所述导电片。
  3. 如权利要求2所述的电池组，其特征在于，所述第一极耳和所述第二极耳为正极耳，所述第一电芯和所述第二电芯并联连接；所述第三极耳和所述第四极耳为负极耳，所述第三电芯和所述第四电芯并联连接。
  4. 如权利要求3所述的电池组，其特征在于，所述电芯壳体包括容纳所述电芯的电极组件的容纳部和从所述容纳部的周缘向外延伸的密封部，容纳部包括沿第一方向相对设置的第一表面、连接第一表面和密封部的第二表面，所述极耳自所述密封部延伸出电芯壳体。
  5. 如权利要求4所述的电池组，其特征在于，所述第一倾斜部包括相对设置的第一左倾斜部和第一右倾斜部，所述第一左倾斜部与第一弯折部接触连接，所述第一右倾斜部与第二弯折部接触连接，所述第一左倾斜部沿第一方向以钝角倾斜，所述第一右倾斜部沿第一方向以锐角倾斜。
  6. 如权利要求5所述的电池组，其特征在于，所述钝角的范围为135度-140度，所述锐角的范围为40度-45度。
  7. 如权利要求5所述的电池组，其特征在于，所述固定板包括第一左连接部和第一右连接部；所述第一左连接部和第一左倾斜部连接，所述第一左连接部和第一电芯的密封部接触连接；所述第一右连接部和第一右倾斜部连接，所述第一右连接部和第二电芯的密封部接触连接。
  8. 如权利要求7所述的电池组，其特征在于，所述第二倾斜部包括相对设 置的第二左倾斜部和第二右倾斜部，所述第二左倾斜部与第三弯折部接触连接，所述第二右倾斜部与第四弯折部接触连接，所述第二左倾斜部沿第一方向以所述钝角倾斜，所述第二右倾斜部沿第一方向以所述锐角倾斜。
  9. 如权利要求8所述的电池组，其特征在于，所述固定板包括第二左连接部和第二右连接部；所述第二左连接部和第二左倾斜部连接，所述第二左连接部和第三电芯的密封部接触连接；所述第二右连接部和第二右倾斜部连接，所述第二右连接部和第四电芯的密封部接触连接。
  10. 如权利要求9所述的电池组，其特征在于，所述第一右连接部在靠近电芯的一端延伸有第一水平部，所述第二左连接部在靠近电芯的一端延伸有第二水平部；所述第一水平部与第二电芯的第二表面连接，所述第二水平部与第三电芯的第二表面连接。
  11. 如权利要求10所述的电池组，其特征在于，所述第一水平部和所述第二水平部接触连接，所述接触连接的部分延伸设置在第二电芯的第一表面和第三电芯的第一表面之间。
  12. 如权利要求9所述的电池组，其特征在于，所述第一右连接部在远离电芯的一端延伸有第一横向部，所述第一横向部与所述第一右倾斜部接触连接；所述第二左连接部在远离电芯的一端延伸有第二横向部，所述第二横向部与所述第二左倾斜部接触连接。
  13. 如权利要求12所述的电池组，其特征在于，所述固定板包括设于第一右连接部和第二左连接部之间的开槽，所述开槽设置在第一收容槽和第二收容槽之间，所述导电片覆盖所述开槽。
  14. 如权利要求1所述的电池组，其特征在于，所述固定板设有开孔和设于第一收容槽的树脂层，所述开孔与所述第一收容槽连通，所述开孔用于将树脂注入到第一收容槽，所述树脂固定后形成树脂层，所述树脂用于将电芯和固定板固定。
  15. 一种电池组的制造方法，其特征在于，包括如下步骤：
    电池模组制造方法：将多个电芯沿第一方向堆叠设置，借助工装夹具对相邻电芯的极耳的焊接部进行归拢整形，得到电池模组；
    安装固定板：将固定板安装在电池模组上，借助固定板上倾斜部的作用使得极耳的弯折部弯折并贴合倾斜部，极耳的焊接部伸出固定板的第一孔。
  16. 如权利要求15所述的电池组的制造方法，其特征在于，所述将多个电芯沿第一方向堆叠设置包括：将每两个电芯按照正极耳对齐正极耳、负极耳对齐负极耳的方式进行堆叠，形成多个电芯组，将所述多个电芯组按照正极耳对齐负极耳、负极耳对齐正极耳的方式进行堆叠。
  17. 如权利要求16所述的电池组的制造方法，其特征在于，所述电芯之间通过泡棉进行堆叠，所述电芯组之间通过泡棉进行堆叠，所述电池模组的两侧以及底部粘贴泡棉。
  18. 如权利要求15所述的电池组的制造方法，其特征在于，所述制造方法还包括将绝缘件设置在固定板上，再在绝缘件上安装集成电池管理单元，并通过螺栓进行固定。
  19. 如权利要求15所述的电池组的制造方法，其特征在于，所述制造方法还包括焊接步骤，将所述焊接部进行折弯，并将折弯后的焊接部焊接于固定板上的导电片。
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