WO2020252803A1 - Batterie à cellule unique, bloc-batterie d'alimentation et véhicule - Google Patents

Batterie à cellule unique, bloc-batterie d'alimentation et véhicule Download PDF

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Publication number
WO2020252803A1
WO2020252803A1 PCT/CN2019/092732 CN2019092732W WO2020252803A1 WO 2020252803 A1 WO2020252803 A1 WO 2020252803A1 CN 2019092732 W CN2019092732 W CN 2019092732W WO 2020252803 A1 WO2020252803 A1 WO 2020252803A1
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WO
WIPO (PCT)
Prior art keywords
tab
single battery
electrode terminal
electrode
pole core
Prior art date
Application number
PCT/CN2019/092732
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English (en)
Chinese (zh)
Inventor
朱燕
王信月
何科峰
江文锋
Original Assignee
比亚迪股份有限公司
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Publication of WO2020252803A1 publication Critical patent/WO2020252803A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/543—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 vehicle manufacturing, in particular to a single battery, a power battery pack having the single battery, and a vehicle having the power battery pack.
  • one purpose of the present application is to propose a single battery that can pass through the spare electrode terminal when a single electrode terminal fails, and the single battery has low design accuracy and strong overcurrent capability.
  • the single battery according to the embodiment of the present application includes: a shell and a pole core located in the shell; the shell has a plurality of surfaces, and at least two of the surfaces are provided with electrical connections with the pole core And extend out the electrode terminal for drawing current outside the housing, the electrode terminal on each surface is at least two; the pole core is provided with tabs, and the electrode terminal passes through the tabs It is electrically connected to the pole core; 600mm ⁇ L, where L is the length of the single battery.
  • the path of current conduction can be shortened, overcurrent is increased, and impedance is reduced.
  • the single pair of positive and negative electrode terminals are connected, it is not connected.
  • the positive and negative electrode terminals can be used as spare electrode terminals, so that when the single battery fails, the whole package can be repaired through the spare electrode terminals, and the structural design of the single battery is more standardized and has better versatility.
  • This application also proposes a power battery pack.
  • the power battery pack according to the embodiment of the present application includes: a battery pack housing; a plurality of single batteries according to any one of the above embodiments, the single batteries are installed in the battery pack housing.
  • This application proposes another vehicle.
  • the vehicle according to the embodiment of the present application is provided with the power battery pack described in any of the above embodiments.
  • Fig. 1 is a schematic structural diagram of a single battery according to an embodiment of the present application.
  • Fig. 2 is a schematic structural diagram of a pole core of a single battery according to an embodiment of the present application.
  • Polar core 1 sub-cell 11, positive electrode sheet 111, negative electrode sheet 112, positive electrode tab 113, negative electrode tab 114, and separator 115.
  • the following describes the single battery 100 according to the embodiment of the present application with reference to FIGS. 1 to 2 and has multiple pairs of electrode terminals.
  • the multiple pairs of positive and negative electrode terminals are all connected, the current conduction path can be shortened and the overcurrent can be increased. Reduce impedance.
  • the single pair of positive and negative electrode terminals are connected, the unconnected positive and negative electrode terminals can be used as spare electrode terminals. In this way, when the single battery 100 fails, the whole package can be repaired through the spare electrode terminals, and the single The structural design of the bulk battery 100 is more in line with standardization and has better versatility.
  • the length of the single battery 100 is L
  • the width of the single battery 100 is H
  • the overall length of the single battery 100 is large, so that the single battery 100 has a larger electric capacity, which is beneficial to increase the cruising range, and the ratio design of the length, width, and thickness of the single battery 100 is beneficial to enhance the entire power battery pack.
  • the energy density of 1000, the volume ratio is better.
  • the single battery 100 includes a casing and a pole core 1.
  • the pole core 1 is located in the shell, the shell has multiple faces, and at least two of the multiple faces are provided with electrode terminals, the electrode terminals are electrically connected to the pole core 1, and the electrode terminals extend out of the shell for drawing out The current facilitates the charging and discharging of the single battery 100 to the outside.
  • the housing includes at least four electrode terminals, and all four electrode terminals can be used for current conduction.
  • the electrode terminals can also be provided on two adjacent surfaces of the housing, for example, both the left side and the front side of the housing are provided with electrode terminals, or the right side and the rear side of the housing are both provided with electrode terminals , It can also realize the function of conducting pole core 1 with external current.
  • the electrode terminal can be columnar or sheet-shaped, which can be selected according to actual installation requirements.
  • the pole core 1 can be connected to the external current through multiple pairs of electrode terminals to increase the number of paths for the single battery 100 to conduct the external current, increase overcurrent, reduce impedance, and prevent
  • the structural size of the single battery 100 meets the design range of the present application, the internal resistance is too large, which improves the rationality of the design of the single battery 100 and improves the practicability.
  • connection state of the multiple pairs of electrode terminals can be flexibly selected.
  • the multiple pairs of electrode terminals and the electrode core 1 are connected to form multiple current flow paths to increase the number of paths through which current is drawn.
  • the current flow path can be turned on at the same time or separately, and can be selected according to the actual power consumption state, which is more flexible.
  • the current can be selectively drawn from the electrode terminal on one side, instead of flowing through the current collecting path of the entire battery pole piece, realizing dual or multiple current path conduction, which can greatly
  • the internal resistance of the single battery 100 is reduced, and the overcurrent capability of the single battery 100 is improved.
  • the single battery 100 of the present application has higher charge and discharge efficiency, which is more conducive to saving the user's charge and discharge time. Better practicality.
  • the single battery 100 When the single battery 100 is installed in the battery pack and used for charging and discharging, at least one current flow path can be used as a backup. Therefore, when the single battery 100 fails, the backup current flow path of the adjacent single battery 100 can be connected to continue current conduction, the battery pack can still be used normally, and the single battery 100 does not need to be removed and replaced immediately , It is convenient for users to use and use subsequent repairs.
  • the pole core 1 is provided with tabs, and the electrode terminals are electrically connected to the pole core 1 through the tabs. That is, the two ends of the tabs can be electrically connected to the electrode terminal and the pole core 1 to ensure that the electrode terminal and the pole core 1 are electrically connected.
  • the current conduction between the cores 1 can be realized stably and effectively, and the current in the pole core 1 can be drawn out to facilitate the charging and discharging of the single battery 100.
  • the pole core 1 is provided with at least two tabs, one tab is electrically connected to the electrode terminal on one side of the housing, and the other is electrically connected to the electrode terminal on the other side of the housing. Connection to facilitate the current extraction of the pole core 1.
  • the single battery 100 of the embodiment of the present application when multiple pairs of positive and negative electrode terminals are connected, the number of paths for current conduction can be increased, the current rush path can be shortened, the overcurrent is increased, and the impedance is reduced.
  • the unconnected positive and negative electrode terminals can be used as spare electrode terminals. In this way, when the single battery 100 fails, the whole package can be repaired through the spare electrode terminals, and the battery capacity of the single battery 100 is large , The battery life is stronger, the structure design of the single battery 100 is more in line with standardization, and the versatility is better.
  • the housing has a first end surface and a second end surface, the first end surface and the second end surface are arranged directly opposite, at least two electrode terminals are provided on the first end surface, and at least two electrodes are provided on the second end surface.
  • the terminals as shown in FIG. 2, two electrode terminals are provided on the first end surface (left end surface in FIG. 2) of the housing, and two electrode terminals are provided on the second end surface (right end surface in FIG. 2) of the housing.
  • part of the electrode terminals on the same surface are used for electrical connection with a load or a battery, so as to draw the electric energy of the single battery 100 for external use.
  • the pole core 1 has a first end and a second end.
  • a plurality of first tabs extend from the first end, the plurality of first tabs form a first tab group, and a plurality of second tabs extend from the second end.
  • a plurality of second tabs form a second tab group, the first end of the pole core 1 is formed with a first tab group, and the second end of the pole core 1 is formed with a second tab group, wherein the first end face
  • the electrode terminal on the second end surface is electrically connected with the first tab, and the electrode terminal on the second end surface is electrically connected with the second tab.
  • the plurality of electrode terminals on the first end surface are connected to the first tab group
  • the plurality of electrode terminals on the second end surface are connected to the second tab group
  • the first tab group and the second tab group The groups are electrically connected to the pole core 1, so that the pole core 1 can be connected to an external current through multiple current flow paths, thereby improving the overcurrent capability of the single battery 100.
  • the polarity of the electrode terminals on each surface is the same, the first end of the pole core 1 extends from a plurality of first tabs, and the plurality of first tabs form a set of first tabs ,
  • the first end surface is provided with a plurality of positive electrode terminals, the plurality of positive electrode terminals are all connected to the first tab group, the second end of the pole core 1 extends with a plurality of second tabs, and a plurality of second tabs
  • a group of second tab groups is formed, a plurality of negative electrode terminals are provided on the second end surface, and the plurality of negative electrode terminals are all connected to the second tab group, so that the polarity of the electrode terminals on the first end surface is uniform It is a positive electrode, and the polarity of the electrode terminal on the second end surface is a negative electrode.
  • the first end of the pole core 1 extends from a plurality of first tabs, the plurality of first tabs form at least two sets of first tabs, and the first end surface is provided with a plurality of positive electrode terminals, and a plurality of positive electrodes At least one of the terminals is connected to a group of first tabs, and at least one of the plurality of positive electrode terminals is connected to another group of first tabs.
  • the second end of the pole core 1 extends with a plurality of second tabs, the plurality of second tabs form at least two sets of second tabs, and the second end surface is provided with a plurality of negative electrode terminals, At least one is connected to a set of second tabs, and at least one of the plurality of negative electrode terminals is connected to another set of second tabs. Therefore, the polarity of the electrode terminals on the first end face is positive, and the second The polarity of the electrode terminal on the end face is negative.
  • each surface is provided with a positive electrode terminal and a negative electrode terminal
  • the first end of the pole core 1 extends from a plurality of first tabs
  • the plurality of first tabs form at least two sets of first tabs. Extreme ear group.
  • the first end surface is provided with a positive electrode terminal and a negative electrode terminal
  • the second end surface is provided with a positive electrode terminal and a negative electrode terminal. Therefore, both the first end surface and the second end surface are provided with a positive electrode terminal and a negative electrode terminal.
  • the first tab group includes a positive tab group and a negative tab group
  • the second tab group includes a positive tab group and a negative electrode.
  • a tab group, and the positive tab group is connected with the positive electrode terminal
  • the negative tab group is connected with the negative electrode terminal.
  • the positive electrode terminal on the first end surface is connected to the positive electrode tab group in the first tab group
  • the negative electrode terminal on the first end surface is connected to the negative electrode tab group in the first tab group
  • the positive electrode on the second end surface The electrode terminal is connected to the positive electrode tab group in the second tab group
  • the negative electrode terminal on the second end surface is connected to the negative electrode tab group in the second tab group.
  • a first lead-out piece is also provided between the electrode terminal on the first end surface and the first tab group.
  • the multiple electrode terminals on the first end surface are connected to the first lead-out tab.
  • the first lead-out tab is connected to the first tab group.
  • the contact length is the width L21 of the first tab group, and/or a second lead-out piece is provided between the electrode terminal on the second end surface and the second tab group, and the multiple electrode terminals on the second end surface are connected to the second tab group.
  • the lead-out pieces are connected, and the contact length between the second lead-out piece and the second tab group is the width L22 of the second tab group.
  • first lead-out piece and the second lead-out piece can be provided at the same time, the first lead-out piece can also be provided separately, or the second lead-out piece can be provided separately, which can be selectively set according to actual connection requirements to meet the electrode terminals
  • the connection with the lug needs to ensure good current conduction between the pole core 1 and the electrode terminal.
  • the first lead-out piece and the second lead-out piece both extend toward the pole core. In this way, the pole core 1 and the electrode terminal are electrically connected through the tabs and the lead-out pieces. Therefore, the provision of the lead-out piece can reduce the risk of electrode terminals or tabs.
  • the poor contact caused by the too small length of the battery ensures that the tabs and the electrode terminals are in effective contact with the first lead-out piece or the second lead-out piece, which improves the stability of the current conduction of the single battery 100 and is convenient for long-term use.
  • both ends of the housing have end plates, the end plates are provided with electrode terminals for electrical connection with the outside, and the electrode terminals penetrate the end plates, that is, both ends of the electrode terminals extend to both sides of the end plate respectively ,
  • the first end of the electrode terminal is located in the housing, so that the first end of the electrode terminal is electrically connected to the electrode core 1, and the second end of the electrode terminal is located outside the housing.
  • the second end of the electrode terminal is used to electrically connect with an external device, so that the electric energy in the single battery 100 can be output to an external device.
  • the second end of the electrode terminal is connected to the adjacent single battery 100 to connect the multiple single batteries 100 in series, so that the multiple single batteries 100 can be charged and discharged at the same time, thereby improving the use efficiency of the battery pack.
  • the housing includes a first end plate and a second end plate, that is, the end plate includes a first end plate and a second end plate, and the first end plate and the second end plate are respectively located at both ends of the pole core 1. , Both ends of the pole core 1 are provided with tabs.
  • the first end plate is provided with a first electrode terminal and a second electrode terminal
  • the second end plate is provided with a first electrode terminal and a second electrode terminal.
  • the first electrode terminal and the second electrode terminal penetrate the corresponding end plate.
  • One electrode terminal and the second electrode terminal have different polarities, for example, the first electrode terminal is a positive electrode terminal, and the second electrode terminal is a negative electrode terminal.
  • each unit cell 100 includes at least two positive electrode terminals and two negative electrode terminals. Both the positive electrode terminal and the negative electrode terminal penetrate the corresponding end plates, so that the storage element can be electrically connected to the outside through a pair of positive and negative electrode terminals, or simultaneously electrically connected to the outside through two pairs of positive and negative electrode terminals.
  • the single battery 100 is designed with multiple electrode terminals, which can reduce the size of a single electrode terminal, reduce the difficulty of sealing and manufacturing a single electrode terminal, and at the same time improve the overcurrent capability, and improve the safety and stability of the single battery 100. .
  • At least one of the first end plate and the second end plate is provided with a lead-out piece, the lead-out piece faces one side of the pole core 1, and the lead-out piece is directly electrically connected to the corresponding tab and the corresponding electrode terminal, That is, the inner end of the lead-out piece is electrically connected to the tab, and the outer end of the lead-out piece is electrically connected to the electrode terminal.
  • the pole core 1 can be electrically connected to the electrode terminal through the tab and the lead-out piece.
  • the number of lead-out pieces can be reduced.
  • the poor contact caused by the too short length of the electrode terminal or the electrode terminal ensures that the electrode terminal and the electrode terminal are in effective contact with the lead-out piece, which improves the stability of the current conduction of the single battery 100 and is convenient for long-term use.
  • the contact width between the lead piece and the tab is L2, that is, the width L2 of the lead tab is the contact width between the lead piece and the tab, and the width of the lead piece is not less than the contact width of the tab. Therefore, the lead piece and the tab
  • the flow width of is the width L2 of the tab itself, and the width of the tab is larger. In this way, it can be ensured that there is an excellent overcurrent efficiency between the lead-out piece and the tabs, and the overcurrent capability of the single battery 100 can be improved.
  • both ends of the pole core 1 are respectively provided with a tab group formed by a plurality of tabs.
  • the tab group includes a positive tab set and a negative tab set.
  • the positive tab set is electrically connected to the positive electrode terminal.
  • the negative electrode tab group is electrically connected to the negative electrode terminal.
  • the positive electrode tab group includes a plurality of positive electrode tabs, at least one of the plurality of positive electrode tabs is electrically connected to an external positive electrode terminal
  • the negative electrode tab group includes A plurality of negative electrode tabs, at least one of the plurality of negative electrode tabs is electrically connected to the external negative electrode terminal. In this way, the number of tabs corresponding to the electrode terminal can be selected according to actual use needs. The selection is flexible and easy to implement Flexible adjustment during application.
  • a single pole core 1 is contained in the housing, one end of the pole core 1 is electrically connected to the positive electrode terminal, and the other end is electrically connected to the negative electrode terminal.
  • the pole core 1 may be a laminated pole core 1, that is, the pole core 1 is formed by stacking a plurality of pole pieces. In this way, the two ends of each pole piece are electrically connected to the electrode terminals on the two end plates respectively to ensure The pole core 1 and the electrode terminal have good conductivity.
  • the pole core 1 can also be a wound pole core 1, which can also realize the function of current conduction.
  • the pole core 1 includes a plurality of sub-cells 11.
  • the sub-cell 11 contains a positive electrode sheet 111 and a negative electrode sheet 112.
  • a separator 115 is arranged between the positive electrode sheet 111 and the negative electrode sheet 112.
  • the separator 115 can effectively separate the positive electrode sheet 111 and the negative electrode sheet 112 to Keep both the positive electrode 111 and the negative electrode 112 in a normal current flow state, prevent the positive electrode 111 and the negative electrode 112 from interfering with each other, avoid contact and short circuit between the positive electrode 111 and the negative electrode 112, and improve the safety of the single battery 100.
  • the area of the separator 115 is larger than that of the positive electrode sheet 111 and the negative electrode sheet 112, so that the separator 115 can effectively isolate the positive electrode sheet 111 and the negative electrode sheet 112.
  • the positive electrode plate 111 is electrically connected with a positive electrode tab 113
  • the negative electrode plate 112 is electrically connected with a negative electrode tab 114.
  • the electrode core 1 includes at least two sub-cells 11, and one of the two sub-cells 11
  • the positive electrode sheet 111 of 11 is adjacent to the negative electrode sheet 112 of the other sub-cell 11.
  • the battery cell is overlapped by a plurality of positive electrode sheets 111 and a plurality of negative electrode sheets 112, so that the battery capacity of the single battery 100 is effectively increased, and the current drawing of the battery core is facilitated.
  • the lead-out direction of the positive pole tab 113 and the negative pole tab 114 of each sub-cell 11 is the same, and the lead-out directions of the tabs in two adjacent sub-cells 11 are opposite.
  • the positive electrode tab 113 and the negative electrode tab 114 of the first one are led out in the first direction (left side in FIG. 1), and the positive electrode tab 113 and the negative electrode tab 114 of the second of the two sub-cells 11 both face the first direction. Lead out in two directions (on the right in FIG. 1), whereby the multiple tabs of the single battery 100 are respectively drawn from different sides, which facilitates the distributed arrangement of the overall structure of the single battery 100, so that the overall structure of the single battery 100 is distributed More evenly.
  • a plurality of sub-cells 11 are stacked along the thickness direction of the single cell 100. As shown in FIG. 1, the single cell 100 includes two sub-cells 11, and the two sub-cells 11 are arranged along the line of the single cell 100.
  • the width direction of 100 is staggered, so as to prevent the positive electrode tab 113 and the negative electrode tab 114 from being too concentrated, prevent the positive electrode tab 113 and the negative electrode tab 114 from contacting and short-circuit, and improve the safety of the single battery 100.
  • a single pole core 1 is contained in the housing, one end of the pole core 1 is electrically connected to the positive electrode terminal, and the other end is electrically connected to the negative electrode terminal.
  • the pole core 1 may be a laminated pole core 1, that is, the pole core 1 is formed by stacking a plurality of pole pieces. In this way, the two ends of each pole piece are electrically connected to the electrode terminals on the two end plates respectively to ensure The pole core 1 and the electrode terminal have good conductivity.
  • the pole core 1 can also be a wound pole core 1, which can also realize the function of current conduction.
  • the pole piece in the pole core 1 further includes a current collector.
  • the tab and the current collector are integrated, and the tab and the current collector are formed by die-cutting copper foil or aluminum foil. Therefore, on the one hand, the tab is quickly formed, reducing the process cost, and on the other hand, the tab and the current collector are integrated. The transmission performance is better, and the shape of the tab can be die-cut according to actual needs, which is easy to structure and can be used flexibly.
  • the pole piece of the pole core 1 includes a current collector, and the current collector includes an electrode material covering area and an insulating material covering area, wherein the insulating material covering area is between the tab and the electrode material covering area, and the insulating material The covering area has an insulating material layer.
  • the tabs and the electrode material covering area can be insulated and separated by the insulating material layer, avoiding contact and short circuit between the two, and improving the safety and stability of the current draw of the electrode core 1.
  • the single battery 100 further includes an explosion-proof valve.
  • the explosion-proof valve is arranged on the shell, for example, the explosion-proof valve is arranged on the end plate of the shell, and the explosion-proof valve is located outside the two electrode terminals.
  • the explosion-proof valve can be used as a pressure relief device for the single battery 100 and used in the single battery. When the pressure in 100 is abnormal or too high, the pressure is relieved to keep the pressure in the accommodating cavity within a safer range. In this way, the internal pressure of the single battery 100 can be prevented from swelling and deforming, and the use of the single battery 100 can be improved. Security and stability.
  • This application also proposes a power battery pack.
  • the power battery pack according to the embodiment of the present application includes: a battery pack housing and a plurality of single cells 100 in the foregoing embodiments.
  • the single battery 100 is contained in the battery pack housing, and the multiple single batteries 100 are arranged in sequence, and the upper and lower ends of the multiple single batteries 100 are kept flush.
  • the electrode terminals of a plurality of single cells 100 can be connected in series through the connecting piece, and the plurality of single cells 100 can be charged and discharged at the same time, which improves the charging and discharging efficiency of the power battery pack and the battery capacity of the power battery pack.
  • This application also proposes a vehicle.
  • the vehicle according to the embodiment of the present application is provided with the power battery pack of the above-mentioned embodiment.
  • the single battery 100 of the power battery pack fails, the other single batteries 100 can still be used normally, ensuring that the vehicle always has a stable power output and improving overall The utility and safety of the car, and the power battery pack is convenient to maintain.
  • the single cell includes a shell and a pole core located in the shell.
  • the two sides of the shell are respectively provided with electrode terminals that are electrically connected to the pole core and extend out of the shell for drawing current.
  • the electrode terminals on each side are 2; there are tabs on the pole core, and the electrode terminals are electrically connected to the pole core through the tabs;
  • L is the length of the single battery
  • the single battery is marked as S1.
  • Example 2 Compared with Example 1, the difference is that there is a set of tabs on both ends of the pole core, and there is an electrode terminal on each of the two opposite sides of the housing, and the single battery is marked as D1.
  • Embodiment 2 Compared with Embodiment 2, the difference is that there is a set of tabs on both ends of the pole core, and there is an electrode terminal on each of the two opposite faces of the housing, and the single battery is marked as D2.
  • Test equipment charge and discharge cabinet
  • Test method the discharge DCIR parameters of the regulating device are measured under the conditions of normal temperature, 50% SOC, 1.5C@30s, Example 1 to Example 6, Comparative Example 1 to Comparative Example 3. The test results are shown in Table 1. (The test method is a common method in the field)
  • Test equipment charging and discharging cabinet, thermocouple, Agilent data collector
  • Test method The temperature rise parameters of the positive electrode terminal and the lead-out sheet were measured by the adjustment device under the continuous charge and discharge test conditions of 2C in an adiabatic environment.
  • Example 1 to Example 6 Comparative Example 1 to Comparative Example 3.
  • the test results are shown in Table 1. (The test method is a common method in the field)
  • Test equipment charge and discharge cabinet
  • Test method electrically connected to the charge and discharge cabinet, and measured the last charge and discharge energy efficiency parameters under the condition of continuous charge and discharge 3 times at 1C, Example 1 to Example 6, Comparative Example 1 to Comparative Example 3. The test results are shown in Table 1. (The test method is a common method in the field)
  • Example 1 Serial number DCIR Temperature rise Energy efficiency Example 1 0.65-0.77 10-13°C 92%-94% Example 2 0.69-0.83 11-17°C 91-93% Example 3 0.8-0.94 14-18°C 90%-92% Example 4 0.9-1.1 18-22°C 89%-91% Example 5 1.0-1.2 17-20°C 90%-93% Example 6 0.9-1.1 16-20°C 89%-92% Comparative example 1 1.5-2.0 20-25°C 83%-87% Comparative example 2 1.7-2.2 22-27°C 86%-88% Comparative example 3 1.9-2.5 25-30°C 87%-89%
  • the single battery (100) includes: a casing and a pole core (1) located in the casing; the casing has a plurality of surfaces, and at least two of the surfaces are provided with
  • the pole core (1) is electrically connected to and extends out of the housing with electrode terminals for drawing current, and there are at least two electrode terminals on each surface; the pole core (1) is provided with A tab, the electrode terminal is electrically connected to the pole core (1) through the tab; 600mm ⁇ L, where L is the length of the single battery (100).
  • the single battery (100) of the embodiment of the present application 10 ⁇ L/H ⁇ 20, where H is the thickness of the single battery (100).
  • the housing has a first end surface and a second end surface, the first end surface is provided with at least two electrode terminals, and the second end surface is provided with At least two of the electrode terminals;
  • the pole core (1) has a first end and a second end, a plurality of first tabs extend from the first end, and the plurality of first tabs form a first A set of tabs, a plurality of second tabs extend from the second end, and a plurality of the second tabs form a second tab set; the electrode terminal on the first end surface and the first tab The tab is electrically connected, and the electrode terminal on the second end surface is electrically connected with the second tab.
  • the plurality of electrode terminals on the first end surface are connected to the first tab group, and the plurality of electrode terminals on the second end surface are connected to The second tab group is connected.
  • a first lead-out piece is further provided between the electrode terminal on the first end surface and the first tab group, and a plurality of One of the electrode terminals is connected to the first lead-out piece, and the contact length between the first lead-out piece and the first tab group is the width of the first tab group; and/or the second end surface
  • a second lead-out piece is further provided between the electrode terminal on the upper side and the second tab group, and a plurality of the electrode terminals on the second end surface are connected to the second lead-out piece, and the second The contact length between the lead piece and the second tab group is the width of the second tab group.
  • the polarity of the electrode terminals on each surface is the same.
  • a positive electrode terminal and a negative electrode terminal are provided on the first end surface, and a positive electrode terminal and a negative electrode terminal are provided on the second end surface.
  • the first tab group has at least two and the second tab group has at least two; the first tab group includes a positive electrode group and a negative electrode Ear group, the second electrode group includes a positive electrode group and a negative electrode group.
  • the positive electrode tab group is connected to the positive electrode terminal
  • the negative electrode tab group is connected to the negative electrode terminal
  • the housing includes a first end plate and a second end plate, and the first end plate and the second end plate are respectively located at both ends of the pole core , Both ends of the pole core (1) are provided with the tabs; the first end plate is provided with a first electrode terminal and a second electrode terminal, and the second end plate is provided with the first electrode The terminal and the second electrode terminal, the first electrode terminal and the second electrode terminal penetrate the corresponding end plate.
  • At least one of the first end plate and the second end plate is provided with a lead piece on a side facing the pole core (1), and the lead
  • the tab is directly electrically connected to the corresponding tab and the corresponding electrode terminal, and the contact length between the lead tab and the corresponding tab is the width of the tab.
  • the pole core (1) includes a plurality of sub-cells (11), and the sub-cells (11) include a positive electrode sheet (111) and a negative electrode sheet (112) ,
  • the positive electrode sheet (111) is electrically connected with a positive electrode tab (113), and the negative electrode sheet (112) is electrically connected with a negative electrode tab (114); the positive electrode of each sub-cell (11)
  • the lead-out directions of the ear (113) and the negative electrode tab (114) are the same, and the lead-out directions of the tabs in the two adjacent sub-cells (11) are opposite.
  • a plurality of the sub-cells (11) are stacked along the thickness direction of the single battery (100), and each of the sub-cells (11)
  • the positive electrode tab (113) and the negative electrode tab (114) are staggered along the width direction of the single battery (100).
  • the single pole core (1) is contained in the casing.
  • the pole piece in the pole core (1) further includes a current collector, and the tab is integrated with the current collector.
  • the pole piece of the pole core (1) includes a current collector, and the current collector contains an electrode material covering area and an insulating material covering area, and the insulating material covering area is Between the tab and the electrode material covering area, the insulating material area is covered with an insulating material layer.
  • part of the electrode terminals on the same surface are used for electrical connection with a load or a battery.
  • the single battery (100) further includes: an explosion-proof valve, the explosion-proof valve is arranged on the housing and located outside the two electrode terminals.
  • This application also proposes a power battery pack, including: a battery pack housing; a plurality of single batteries (100) as described in any one of the above embodiments, the single batteries (100) are accommodated in the Inside the battery pack housing.
  • This application also proposes a vehicle having the power battery pack described in the foregoing embodiment.

Abstract

L'invention concerne une batterie à cellule unique, un bloc-batterie d'alimentation et un véhicule, la batterie à cellule unique comprenant : un boîtier et une pièce polaire située dans le boîtier ; le boîtier présente une pluralité de côtés et est au moins pourvu de deux bornes d'électrode qui sont disposées sur les côtés, qui sont électriquement connectées à la pièce polaire et qui s'étendent à l'extérieur du boîtier pour être utilisées pour faire sortir un courant, chaque côté présentant au moins deux bornes d'électrode. La pièce polaire est pourvue d'une languette polaire, les bornes d'électrode sont électriquement connectées à la pièce polaire au moyen de la languette polaire, 600 mm < L, L étant la longueur de la batterie à cellule unique.
PCT/CN2019/092732 2019-06-21 2019-06-25 Batterie à cellule unique, bloc-batterie d'alimentation et véhicule WO2020252803A1 (fr)

Applications Claiming Priority (2)

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CN201910544125.3 2019-06-21
CN201910544125.3A CN110265618A (zh) 2019-06-21 2019-06-21 单体电池、动力电池包和车辆

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WO2020252803A1 true WO2020252803A1 (fr) 2020-12-24

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CN113948759A (zh) * 2021-10-18 2022-01-18 蜻蜓实验室(深圳)有限公司 电池单体及锂离子电池组
CN114976417A (zh) * 2022-06-16 2022-08-30 奇瑞新能源汽车股份有限公司 长电芯和新能源电动汽车
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