WO2022147930A1 - Batterie et bloc-batterie - Google Patents

Batterie et bloc-batterie Download PDF

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Publication number
WO2022147930A1
WO2022147930A1 PCT/CN2021/090549 CN2021090549W WO2022147930A1 WO 2022147930 A1 WO2022147930 A1 WO 2022147930A1 CN 2021090549 W CN2021090549 W CN 2021090549W WO 2022147930 A1 WO2022147930 A1 WO 2022147930A1
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WO
WIPO (PCT)
Prior art keywords
battery
sampling
cell
groove
cells
Prior art date
Application number
PCT/CN2021/090549
Other languages
English (en)
Chinese (zh)
Inventor
郭永明
何平
张中林
周燕飞
郎晓强
Original Assignee
比亚迪股份有限公司
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
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Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2022147930A1 publication Critical patent/WO2022147930A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
    • 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
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/51—Connection only in series
    • 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
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • 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 the technical field of batteries, and in particular, the present application relates to a battery and a battery pack.
  • the battery pack is used as a power source to provide electrical energy for the drive motor.
  • the battery pack needs to collect information such as the temperature and/or voltage of the battery during use to understand the multiple batteries in the battery pack. Current working conditions to avoid potential safety hazards due to abnormal battery operation.
  • a plurality of cells in series are arranged inside the battery.
  • how to sample the plurality of cells and how to arrange the sampling structure for sampling the cells are problems that need to be solved at present.
  • the present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a battery, which does not need to change the structure of the battery on the premise of sampling multiple cells in the battery, which is beneficial to the overall arrangement and optimization of the battery.
  • a battery comprising: a casing, a sampling assembly installed inside the casing, and two battery cell strings that are electrically connected;
  • the core strings are arranged side by side, a groove is formed between the two battery core strings and is located at one end of the two battery core strings on the same side, the sampling assembly includes a sampling wire bundle, and the sampling wire bundle includes a plurality of sampling wires, so The sampling lines are accommodated in the grooves, and the sampling lines are electrically connected with the battery cells in one-to-one correspondence.
  • the battery samples multiple cells at the same time through multiple sampling lines, and further, multiple sampling lines are arranged in the groove between the two cell strings, without changing the structure of the battery itself, and does not occupy any space at all.
  • the height space of the battery is more conducive to the optimization of the overall arrangement of the battery.
  • a battery pack includes a battery information collector and the battery, and the battery information collector is electrically connected to the battery.
  • FIG. 1 is a schematic exploded view of the structure of a battery provided by an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of the sampling assembly of the battery shown in FIG. 1;
  • FIG. 3 is a schematic diagram of an embodiment of the sampling harness of the battery shown in FIG. 1 being installed in a groove;
  • FIG. 4 is a schematic structural diagram of the circuit board and part of the sampling wiring harness of the sampling assembly shown in FIG. 2;
  • Fig. 5a and Fig. 5b are partial structural schematic diagrams of the sampling wire harness shown in Fig. 2 including the second sampling wire, wherein two embodiments of the connection position of the connecting section and the main body are shown;
  • FIG. 6 is a schematic diagram of a partial structure including a first sampling line of the sampling wire harness shown in FIG. 2;
  • FIG. 7 is a schematic structural diagram of a cell string of the battery shown in FIG. 1;
  • FIG. 8 is a schematic view of the assembled structure of the battery shown in FIG. 1 , wherein the casing is not shown;
  • FIG. 9 is a schematic diagram of a battery pack provided by an embodiment of the present application.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as “first” or “second” may expressly or implicitly include one or more of that feature. Further, in the description of the present application, unless otherwise specified, "plurality" means two or more.
  • the present application provides a battery.
  • the battery pack 1000 includes a casing, a sampling assembly installed inside the casing, and two battery cell strings that are electrically connected;
  • the battery cell string includes a plurality of battery cells connected in series, and the two battery cell strings are arranged side by side, A groove is formed between the two cell strings, and the groove is located at one end of the two cell strings on the same side,
  • the sampling assembly includes a sampling wire harness, the sampling wire harness includes a plurality of sampling lines, the plurality of sampling lines are arranged side by side, the sampling lines are accommodated in the grooves, and the sampling lines are electrically connected to the battery cells correspondingly.
  • the battery provided by this application samples the cells through the sampling line, and the sampling wire harness is arranged inside the casing, which makes the arrangement of the battery more rational, and can sample each cell inside the battery, and furthermore, there are multiple sampling lines. Arranged in the groove between the two battery cell strings, it does not occupy the height space of the battery at all, which is more conducive to the overall arrangement optimization of the battery pack 1000 and the car.
  • the following specific embodiments are used for detailed description.
  • a battery 100 includes a casing 10 , a sampling assembly 20 mounted inside the casing 10 , and two battery cell strings 30 ; each battery cell string 30 includes a plurality of battery cells 31 connected in series in sequence , the two cell strings 30 are connected in series and arranged side by side, a groove C is formed between the two cell strings 30 , and the groove C is located at one end of the two cell strings 30 on the same side.
  • the sampling assembly 20 includes a plurality of sampling lines 24 arranged side by side, the sampling lines are accommodated in the groove C, and the sampling lines 24 are electrically connected to the cells 31 in a one-to-one correspondence.
  • the battery cell 31 in the present application may be a structure formed by winding or stacking a positive electrode sheet, a separator and a negative electrode sheet.
  • the opposite ends of the battery string 30 are the head end A and the tail end B.
  • the total number of cells 31 in the two cell strings 30 is N, where N is an integer greater than 2; the groove C extends along the length direction of the cell strings 30 and connects the head end A and the tail end B.
  • the head end A is the position of the ends of the two cells at one end of the two cell strings 30
  • the tail end B is the end of the two cells at the other end of the two cell strings 30 opposite to the head end. location.
  • the direction from the head end to the tail end can be understood as the length direction of the cell string or battery, the length direction refers to the X direction, and the Y direction is the thickness direction of the cell string or battery.
  • the sampling assembly 20 includes a circuit board 21 located at the head end of the cell string 30 and a sampling wire harness 22 for sampling the cells 31 .
  • the sampling wire harness 22 includes a fixed part 23 and N-1 sampling lines 24.
  • the N-1 sampling lines 24 are arranged side by side.
  • the fixed part is located on one side of the head end A and is opposite to the circuit board.
  • the ends of the two cells 31 respectively located at the head end A of the string 30 that are not connected to the adjacent cells are electrically connected to the circuit board 21 , and the sampling wire harness 22 is installed in the groove C.
  • Each sampling line 24 includes a main body, an output section and a connecting section; in this embodiment, a sampling line is used as an example for specific description, each sampling line 24 includes a main body 241, an output section 242 and a connecting section 243, and the main body 241 is located in the groove Inside, the output section 242 is bent and extended relative to the main body 241 toward the side of the cell string 30 away from the groove.
  • the fixing part 23 is fixed at the connection between the main body 241 and the output section 242, the output sections 242 of the N-1 sampling lines 24 are welded and connected to the circuit board 21, and the connecting sections 243 of the N-1 sampling lines 24 are connected to a plurality of electrical circuits.
  • the cores 31 are connected correspondingly. Wherein, the corresponding connection may be that two series-connected cells share one sampling line, or except for the cells located at the head end and the end, each other cell corresponds to two sampling lines, which are set according to actual needs.
  • N-1 sampling lines 24 are arranged side by side and not on the same plane. Taking the main bodies of all the sampling lines 24 together in the groove C as an example for illustration, the N-1 sampling lines 24 are arranged in parallel and are not on the same plane,
  • a plurality of N-1 sampling lines are arranged in parallel and side by side, wherein the N-1 sampling lines are structured into multiple groups, and the multiple groups of sampling lines are arranged in a stacked manner in the direction away from the groove C, and can be divided into two Layers or more than two layers are stacked, and the number of each layer can be equal or unequal.
  • the N-1 sampling lines 24 are stacked in three layers, and the number of the three-layer sampling lines is distributed in steps, and in the direction away from the trench C, the number of sampling lines in each group increases.
  • the number of cells is 8, the number of sampling lines 24 is 9, the main body of the 9 sampling lines 24 is divided into three layers, and the number of one layer located on the bottom wall of the groove C is at least 2 sampling lines. There are 3 sampling lines in the middle layer and 4 sampling lines in the top layer.
  • the sampling lines 24 in the three layers are distributed in steps and conform to the cross-sectional shape of the groove C to ensure that the sampling wire harness 22 does not protrude from the side of the cell string after being installed. , without increasing the height of the entire battery.
  • the wiring harnesses in other positions are gradually reduced and can be arranged according to the actual situation.
  • the cross section of the sampling wire bundle 22 formed by N-1 sampling wires is V-shaped. It can be understood that the nine sampling lines 24 are divided into four layers, and the bottom layer is one.
  • the cross section of the sampling wire bundle 22 formed by N-1 sampling wires is circular. It can be understood that the nine sampling lines 24 are distributed in a circle, and can be arranged in two circles or three circles.
  • the outer contour shape of the cross section of the sampling wire harness 22 is the same as the cross section contour shape of the groove C.
  • the outer contour shape of the cross section of the sampling line bundle is the same as the cross section contour shape of the groove C, and the same includes a certain tolerance range and similar shapes.
  • the groove C does not affect the overall height of the battery.
  • N-1 sampling lines are arranged in parallel on the same plane, as long as they can be completely or partially accommodated by the grooves.
  • a plurality of sampling lines 24 can be arranged side by side on the same plane; a plurality of sampling lines 24 can also be arranged in multiple rows and columns, and the sampling lines 24 in each row and column are arranged in parallel; or A plurality of sampling lines 24 are stacked and arranged; in order to reasonably arrange the sampling lines of the sampling line bundle 22, on the premise of not changing the structure of the battery cell string and the battery, use the groove on the cell string to install the sampling line bundle 22. In the groove, it can be completely or partially contained in height, which avoids or reduces the space occupied by the sampling wire harness in the height direction of the battery, thereby realizing a reasonable layout of the battery and the battery pack 1000 .
  • the plurality of cells 31 of each cell string 30 are arranged in a row, and the number of cells of the two cell strings 30 is the same and symmetrically arranged.
  • the groove C is located between the two cell strings 30 and the groove C is located at one end on the same side of the two cell strings 30 , and the same side end of the two cell strings 30 refers to:
  • one of the cell strings 30 used to define the side of the groove C is the upper end side
  • the other battery string 30 used to define the side of the groove C is also the upper side side.
  • the side surface of the lower end of 30 defines the groove C
  • the side surface of the other cell string 30 that defines the groove C is also the lower end side surface of the battery cell string 30 .
  • the battery cell string includes a plurality of packaging bags 40 , and the battery cells 31 are correspondingly packaged in the packaging bags 40 to form a battery cell assembly.
  • the cell assembly includes two opposite end surfaces 311 , two opposite side surfaces 312 , and two opposite first surfaces 310 connecting the side surfaces 312 , and the side surfaces 312 and the first surfaces 310 are connected by a transition arc D.
  • the two first surfaces 310 are the opposite faces of the cell assembly in the thickness direction of the cell string
  • the two side surfaces 312 are the opposite faces of the cell assembly in the height direction of the cell string
  • the two end faces 311 are the opposite faces of the cell assembly in the direction of the height of the cell string.
  • Insulation plates are sandwiched between the first surfaces 310 of the cell assemblies in the two cell strings 30 that are opposite to each other. As shown in FIG. 3 , the transition arcs D of the cell assemblies in the two cell strings 30 that are opposite to each other and the insulation
  • the sides of the plate 2 together define a groove C.
  • the N-1 sampling lines of the sampling wire harness are installed in the groove C and located in the casing 10, the depth of the groove is smaller than the outer diameter of the sampling wire, and does not need to occupy the internal space, compared with the prior art that the sampling wire harness is placed on the outer surface of the casing It can save the space of the battery in the height direction, and can limit the volume energy density of the battery.
  • the groove wall of the groove C includes the transition arc D and the side of the insulating plate, or the groove wall of the groove C includes the transition arc D, part of the first surface 310 and the side of the insulating plate.
  • the side of the insulating board refers to the side surface of the insulating board.
  • the first surfaces 30 of the cell components in the two cell strings 30 that are opposite to each other are directly attached, and the cell components in the two cell strings 30 are opposite to each other
  • the transition arc D defines the groove C.
  • the groove wall of the groove C may be a transition arc or a transition arc D and part of the first surface 310 .
  • first surface 310 , the end surface 311 and the side surface 312 of the cell assembly can be understood as the outer surface of the packaging bag 40 .
  • the packaging bag 40 includes a sealing portion 41 .
  • the sealing portion 41 is located on the side surface 312 of the cell assembly.
  • the sealing portion 41 and the side surface 312 of the cell assembly are enclosed to form an accommodation space.
  • the accommodation space and the groove D is connected.
  • the accommodating space can also accommodate part of the sampling lines, which is beneficial to improve the space utilization rate.
  • the material of the packaging bag can be selected from aluminum-plastic film or polypropylene, which is not specifically limited in this application.
  • the sealing portion 41 is a structure formed by closing the opening of the packaging bag 40 .
  • the cell 31 includes a first electrode and a second electrode (not shown), the plurality of cells 31 in the cell string 30 are arranged in a preset direction, and the first electrode and the second electrode are along a preset direction.
  • the directions are distributed on opposite sides of the cell 31 , and the first electrode and the second electrode extend out from the packaging bag 40 .
  • the first electrode and the second electrode can be understood as a positive tab and a negative tab.
  • the preset direction may be the length direction of the cell string, that is, the direction from the head end to the tail end.
  • the output sections 242 of the N-1 sampling lines 24 are aligned and arranged in parallel, and the fixing portion 23 is injection-molded at the position where the output sections 242 are connected to the main body.
  • the output sections 242 of the N-1 sampling lines are first lined up in the mold, and then the molten colloid is injected into the mold for injection molding.
  • a plurality of sampling lines are simultaneously bent and injected into the same fixed part 23, which simplifies the processing technology and ensures the accuracy.
  • injection molding can also be performed after the output section 242 is bent relative to the main body 242 .
  • the fixing portion may also be a cable tie, or the fixing portion may be structural adhesive.
  • the free end of the output section 242 of each sampling line 24 is a metal joint 242a
  • the fixing part 23 is a plate-like structure
  • the output sections 242 of the N-1 sampling lines 24 are fixed in the fixing part
  • the N-1 metal joints 242a extend out of the fixing part 23 .
  • the position where the output section 242 is connected to the main body 241 is a transition section (not shown), the output section 242 is connected to the main body 241 through the transition section, and the transition section is fixed in the fixing portion 23 .
  • the output section 242 may be directly connected to the main body 2411 .
  • the arrangement of the fixing portion in this embodiment facilitates the limitation of the spacing of the output sections between the sampling lines, and also facilitates the control of the welding spacing between the metal joint 242a of the sampling line bundle and the circuit board 21 .
  • the fixing part 23 includes a fixing body and a bent edge (not shown) provided at one end of the fixing body (not shown), and the output sections 242 of the N-1 sampling lines 24 are fixed Inside the fixing body, and N-1 metal joints 242a protrude out of the fixing portion 23 through the bent edges.
  • the circuit board 21 includes metal solder joints 210 corresponding to the output sections of the sampling lines 24 one-to-one.
  • the bent edge 232 abuts against the surface of the circuit board 21 with the metal solder joints 210 , and the metal joints 242 a are respectively soldered to the metal joints 210 .
  • the electrical connection between the sampling wire harness 22 and the circuit board 21 is realized on the soldering point 210 , wherein the direct soldering can save the conventionally used connectors for plugging, which can save the cost.
  • a safety structure (not shown) is also provided on the surface where the circuit board 21 and the sampling wire harness are welded.
  • the safety structure is a fuse.
  • the safety structure can also be a conductive sheet, and the conductive sheet is provided with a weak area; or, the safety structure can also be a protection structure formed by its own circuit structure. When the current of the circuit inside the battery exceeds the threshold, the insurance structure can play the role of overcurrent protection, thereby improving the safety of the battery.
  • the fuse may be a serpentine fuse or a chip fuse.
  • connection sections 243 of the N-1 sampling lines 24 are distributed along the length direction of the cell string 30 , that is, the direction from the head end A to the tail end B can be understood.
  • the sampling wire harness further includes a support member 246 , the connecting section 243 of the sampling wire 24 is bent and disposed relative to the main body 241 , and a support member 246 is provided at the connection between the connecting section 243 and the main body 241 .
  • the connecting section 243 includes a first section 243 a connected with the main body 241 and a second section 243 b connected with the first section 243 a at an angle.
  • the first section 243a is connected to the second section 243b by bending, and the support member 246 is formed on the first section 243a.
  • the support 246 is a plastic plate, which is formed by injection molding after the connecting section 243 is bent. It can be understood that the connecting section is now bent relative to the main body and then in-mold injection is performed. .
  • the support plate 246 is a sheet-like body, which is wrapped on the first section 243a of the connecting section 243 to keep the connecting section 243 at a certain bending angle.
  • connection segment 243 is positioned to limit the distance between the connection segment 243 and the main body 241 of the sampling line 24. , which is more convenient for welding with the battery.
  • the outer surface of the connecting section 243 of each sampling line 24 is wrapped with glue to support the bending of the connecting section 243 relative to the main body 241 , that is, the sampling line 24 is directly coated with glue on the outer surface of the connecting section 243 After processing, an adhesive layer is formed to wrap around the connecting section 243 .
  • the battery pack 1000 includes a conductive sheet 25 .
  • the conductive sheet 25 connects two cells in series at the tail end B of the two cell strings 30 , and the two cell strings 30 are located at the head end respectively.
  • One of the two cells of A is provided with a first electrode lead-out member 33, and the other cell is provided with a second electrode lead-out member (not shown).
  • the first electrode lead-out member 33 and the second electrode lead-out member are used for The total current drawn from the cell string.
  • the first electrode lead-out member 33 may be the positive electrode tab of the cell at the head end A
  • the second electrode lead-out member may be the negative electrode tab of the cell at the head end B.
  • the first electrode lead-out member 33 may be the negative electrode tab of the cell at the head end A, and the second electrode lead-out member may be the positive electrode tab of the cell at the head end B. In other embodiments, the first electrode lead-out member 33 and the second electrode lead-out member may also be lead-out pieces connected to the tabs.
  • the positive and negative electrodes of the cell are distributed on opposite sides of the cell.
  • the first electrode lead-out member 33 and the second electrode lead-out member are the tabs of the battery cells 31 located at the head ends of the two battery cell strings 30 that are not connected to other battery cells.
  • the circuit board 21 includes two first soldering pads 212 arranged at intervals; the N-1 sampling lines 24 include a first sampling line 24a, and the connecting section 243 of the first sampling line 24a is connected with the second soldering pad 26, the first electrode
  • the lead-out piece 33 and the second electrode lead-out piece are respectively welded and connected to the two first welding pieces 26 , and the second welding piece 26 is welded and connected to the conductive piece 25 .
  • the cells at the head ends of the two cell strings 30 are connected to the circuit board 21 through the first electrode lead-out member 33 and the second electrode lead-out member, the sampling wire harness 22 is welded to the circuit board through the output section 242 fixed by the fixing part 23, and the sampling wire harness 22.
  • the second welding piece 26 on the first sampling line 24a is welded with the cell conducting piece 25 at the tail end of the cell string 30, which can ensure that the sampling wire harness 22 and the circuit board 21 can be connected to the head end of the cell string 30.
  • Information sampling is performed on the cell at the end and the cell at the tail end.
  • the first sampling line 24a is laser welded between the second welding piece 26 and the conducting piece 25 of the cell string 30, so as to realize electrical connection, and has a reliable structure and low impedance.
  • the circuit board 21 includes two conductive lines 211 arranged at intervals, and the first soldering piece 212 is connected to the circuit board 21 through the conductive lines 211 . In other embodiments, the first solder pads 212 are directly soldered to the circuit board 21 .
  • every two adjacent cells 31 in the cell string 30 are connected by connecting sheets 34 , and the N ⁇ 1 sampling lines 24 include N cells 31 and N cells 31 .
  • the connecting pieces 34 correspond to the second sampling lines 24b one-to-one, and the sampling assembly 20 includes a third welding piece 27 corresponding to the second sampling line 24b one-to-one, and the third welding piece 27 is fixedly connected to the connection of the second sampling line 24b On the segment, the third welding piece 27 is used for welding and conducting with the connecting piece 34 .
  • a connecting piece 34 is provided between two adjacent cells 31 in the same cell string. It can be understood that the gap between the two adjacent cells 31 is correspondingly provided with a connecting piece 34, and the connecting piece 34 is connected between two adjacent cells in the gap.
  • the second sampling line 24b is welded with the connecting piece 34 through the third welding piece 27 and is electrically connected (the second sampling line 24b is electrically connected to the cell) for collecting electrical signals at both ends of the cell .
  • the sampling wire harness 22 is N-1 sampling wires arranged in a close line in a row, along the length direction of the cell string 30, the position corresponding to the gap between the two adjacent cells 31 is The position of the connecting piece 34 sets the connecting segment 243 . From the head end to the tail end direction, that is, the length of the second sampling line 24b is gradually elongated along the direction of the cell extension of the cell string, and the first sampling line 24a connected to the conductive sheet 25 is the longest, which can be understood as The cells located at the head end A are in the first row, and they are arranged in sequence.
  • the second sampling line 24b between the first row of cells and the second row of cells is the shortest, and the second sampling line 24b in the middle is based on the connection piece.
  • the sampling wire harness 22 performs signal sampling for each battery cell 31 between the head end and the tail end, so as to realize accurate sampling of the battery.
  • the sampling assembly 20 further includes an information collection element 28, the N-1 sampling lines 24 include a collection line 24c, the information collection element 28 is connected to the connection section of the collection line 24c and is turned on, and the information collection element 28 is connected to a battery cell
  • the cells of the string are pasted between the head and tail ends to collect the physical information of the cells.
  • the information collection element 28 is attached to the tab of the battery cell in the middle of the battery string 30, and the signal collection element is at least one of a temperature sensing element, a humidity sensing element, a pressure sensing element, and an odor sensing element; in this embodiment
  • the signal acquisition element is a temperature sensing element, which is used to acquire the temperature information of the battery cell string.
  • N is 8, that is, the number of cells in the cell string 30 is 4, the total number of cells in the two groups of cell strings is 8, and the corresponding sampling lines in the sampling wire harness 22 are 9
  • the cells of each cell string 30 form three gaps.
  • the first electrode lead-out part 33 and the second electrode lead-out part at one end of the two battery cells 31 respectively located at the head end of the two cell strings are directly connected to the circuit board, and the first electrode of the two battery cells 31 away from the head end is drawn out
  • the element 33 and the second electrode lead-out element are connected to the sampling line 24, and the two electric cells 31 respectively located at the tail end B of the two cell strings are electrically connected through the conductive sheet 25 to realize the series connection of the two cell strings, while the The electrical signals are directly collected through the first sampling line 24a, and are located in three gaps.
  • the two cells including the tail end B are connected to the tabs away from the tail end through the conductive piece, and then sampling is carried out respectively through the second sampling line 24, wherein The acquisition line 24c is located in one of the gaps.
  • the circuit board 21 also has 11 holes, which are matched with the pins of the sampling pins on the first cover plate 12 below and are welded by spot tin to realize the transmission of sampling signals.
  • the casing 10 is a rectangular hollow casing. In this embodiment, two opposite ends of the casing 10 are provided with openings.
  • the battery pack 1000 includes a first cover plate 12 and a second cover plate 15 .
  • the first cover plate 12 is provided with an opening.
  • Sampling pins, cell strings 30 and sampling assemblies 20 are installed in the casing 10 , the first cover plate 12 and the second cover plate 15 are encapsulated on the opening of the casing 10 , and the sampling pins are electrically connected to the circuit board 21 for connecting The sampling signal is transmitted to the battery information collector.
  • the housing 10 is integral with the first cover plate 12 and the second cover plate 15 , and contains the cell strings 30 and the sampling assembly 20 therein. In other embodiments, only one end of the casing 10 is provided with an opening, and the first cover plate 12 covers the opening.
  • the present application further provides a battery pack 1000 , which includes a battery information collector and the above battery 100 , and the battery information collector is electrically connected to the battery.
  • the battery 100 used in the battery pack 1000 in this embodiment is provided with a sampling wire harness and an information collection element inside the casing 10 , and the sampling wire harness 22 is connected to the circuit board 21 .
  • the electrical signal is sampled, and the temperature of the cell in the middle position can be sampled, and the collected information is transmitted to the battery information collector through the circuit board, so as to detect the working state of each cell of the battery inside the battery pack 1000, which is conducive to improving the battery
  • the safety of using the battery pack 100 can be improved, thereby improving the safety of the battery pack 1000 .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

L'invention concerne une batterie (100), la batterie (100) comprenant un boîtier (10), et un ensemble d'échantillonnage (20) et deux chaînes d'éléments connectées électriquement (30) qui sont montées à l'intérieur du boîtier (10) ; chaque chaîne d'éléments (30) comprend une pluralité d'éléments (31) connectés en série de manière séquentielle, les deux chaînes d'éléments (30) sont disposées côte à côte, une rainure (C) est formée entre les deux chaînes d'éléments (30), et la rainure (C) est située au niveau de la même extrémité latérale des deux chaînes d'éléments (30) ; et l'ensemble d'échantillonnage (20) comprend un faisceau de fils d'échantillonnage, le faisceau de fils d'échantillonnage comprend une pluralité de fils d'échantillonnage (24), les fils d'échantillonnage (24) sont logés dans la rainure (C), et les fils d'échantillonnage (24) sont électriquement connectés aux éléments (31).
PCT/CN2021/090549 2021-01-07 2021-04-28 Batterie et bloc-batterie WO2022147930A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110021163.8 2021-01-07
CN202110021163.8A CN114744374B (zh) 2021-01-07 2021-01-07 电池及电池包

Publications (1)

Publication Number Publication Date
WO2022147930A1 true WO2022147930A1 (fr) 2022-07-14

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Country Link
CN (1) CN114744374B (fr)
WO (1) WO2022147930A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024060918A1 (fr) * 2022-09-23 2024-03-28 欣旺达惠州动力新能源有限公司 Groupe d'éléments de batterie et procédé d'acquisition de tension

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CN107431160A (zh) * 2015-06-19 2017-12-01 株式会社Lg 化学 盒和具有该盒的电池模块
US20190259990A1 (en) * 2018-02-16 2019-08-22 Ferrari S.P.A. Vehicular battery pack
KR20190112469A (ko) * 2018-03-26 2019-10-07 에이치엘그린파워 주식회사 전지셀 카트리지 및 이를 포함하는 전지모듈
CN211743281U (zh) * 2019-11-22 2020-10-23 比亚迪股份有限公司 一种电池、电池模组、电池包和电动车
CN211879432U (zh) * 2020-04-03 2020-11-06 比亚迪股份有限公司 电池模组

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107431160A (zh) * 2015-06-19 2017-12-01 株式会社Lg 化学 盒和具有该盒的电池模块
US20190259990A1 (en) * 2018-02-16 2019-08-22 Ferrari S.P.A. Vehicular battery pack
KR20190112469A (ko) * 2018-03-26 2019-10-07 에이치엘그린파워 주식회사 전지셀 카트리지 및 이를 포함하는 전지모듈
CN211743281U (zh) * 2019-11-22 2020-10-23 比亚迪股份有限公司 一种电池、电池模组、电池包和电动车
CN211879432U (zh) * 2020-04-03 2020-11-06 比亚迪股份有限公司 电池模组

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024060918A1 (fr) * 2022-09-23 2024-03-28 欣旺达惠州动力新能源有限公司 Groupe d'éléments de batterie et procédé d'acquisition de tension

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