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CN-121484255-B - Battery monomer, battery device, energy storage system and charging network

CN121484255BCN 121484255 BCN121484255 BCN 121484255BCN-121484255-B

Abstract

The application relates to a battery monomer, a battery device, an energy storage system and a charging network, and belongs to the technical field of batteries. The electrode assembly in the battery cell comprises a first electrode lug and a second electrode lug which are opposite in polarity, the electrode terminal comprises a first electrode terminal and a second electrode terminal which are opposite in polarity, the first electrode terminal is connected with the first electrode lug to form a first lead-out assembly, the second electrode terminal is connected with the second electrode lug to form a second lead-out assembly, the pressure release mechanism is arranged on the shell, the protection module is connected between a first target piece and a second target piece, the first target piece is one of the first lead-out assembly, the second lead-out assembly and the pressure release mechanism, the second target piece is the other one, and the protection module is used for balancing voltage difference. The battery cell, the battery device, the energy storage system and the charging network provided by the application aim to reduce the risk of explosion and ignition of the battery cell in thermal runaway by actively clamping the voltage difference, and have higher reliability.

Inventors

  • YU CHENLU
  • BAI YUCHENG
  • YANG MENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20260112

Claims (14)

  1. 1. A battery cell, comprising: A housing having a receiving cavity; the electrode assembly is accommodated in the accommodating cavity and comprises a first tab and a second tab which are opposite in polarity; the electrode terminal is arranged on the shell and comprises a first electrode terminal and a second electrode terminal which are opposite in polarity, the first electrode terminal is connected with the first electrode lug to form a first lead-out assembly, and the second electrode terminal is connected with the second electrode lug to form a second lead-out assembly; The pressure release mechanism is arranged on the shell; The protection module is connected between a first target piece and a second target piece and comprises a capacitor and a resistor which are sequentially connected, the first target piece is one of the first leading-out assembly, the second leading-out assembly and the pressure relief mechanism, the second target piece is the other of the first leading-out assembly, the second leading-out assembly and the pressure relief mechanism, the protection module is configured to balance respective voltages on the first target piece and the second target piece, the capacitor is used for storing charges when a voltage difference is generated between the first target piece and the second target piece, and the resistor is used for consuming charges when the capacitor discharges.
  2. 2. The battery cell of claim 1, wherein the time constant of the protection module is greater than a ripple period of the battery cell when charged and discharged, and the time constant of the protection module is less than a failure time of the housing when thermal runaway of the battery cell occurs; Wherein the time constant is configured to characterize a product of a capacitance of the capacitor and a resistance of the resistor in the protection module.
  3. 3. The battery cell of claim 1, wherein the capacitor has a capacitance between 0.1 μf and 10 μf; And/or the resistance of the resistor is between 10Ω and 1000Ω.
  4. 4. The battery cell of claim 1, wherein the resistor is a thick film resistor or a wound resistor.
  5. 5. The battery cell of claim 1, wherein the housing comprises an end cap assembly and a housing, the end cap assembly and the housing collectively enclosing the receiving cavity; the end cover assembly comprises an end cover body and an insulating piece which are connected, wherein the end cover body is connected with the pressure relief mechanism, and the insulating piece insulates the end cover body from the electrode terminal and the electrode assembly; The first target may also be one of the first lead-out assembly, the second lead-out assembly, and the end cap body, and the second target is the other of the first lead-out assembly, the second lead-out assembly, and the end cap body.
  6. 6. The battery cell of claim 5, wherein the protection module is disposed within the receiving cavity and/or the protection module is disposed outside the receiving cavity.
  7. 7. The battery cell of claim 5, wherein the protection module is bonded to the insulator and/or the protection module is embedded within the insulator.
  8. 8. The battery cell of claim 1, wherein when the first target member and the second target member are the first lead-out assembly and the second lead-out assembly, respectively, The protection module is connected between the first electrode terminal and the second electrode terminal, and/or between the first electrode terminal and the second electrode tab, and/or between the first electrode tab and the second electrode terminal, and/or between the first electrode tab and the second electrode tab.
  9. 9. The battery cell of any one of claims 1 to 8, wherein the number of protection modules is at least two, and the first target and the second target to which any two protection modules are connected are not identical.
  10. 10. The battery cell of any one of claims 1 to 8, wherein the protection module is welded to the first target and the second target.
  11. 11. A battery device comprising a battery cell according to any one of claims 1 to 10.
  12. 12. An energy storage device comprising a battery device according to claim 11.
  13. 13. An energy storage system comprising an energy storage variable flow device for electrically connecting a power generation device and the energy storage device of claim 12.
  14. 14. A charging network comprising a charging pile and an energy storage device according to claim 12 for providing electrical energy to the charging pile.

Description

Battery monomer, battery device, energy storage system and charging network Technical Field The present application relates to the field of battery technologies, and in particular, to a battery unit, a battery device, an energy storage system, and a charging network. Background With the development of new energy technology, the battery is increasingly widely applied, for example, to mobile phones, notebook computers, battery cars, electric automobiles, electric airplanes, electric ships, electric toy automobiles, electric toy ships, electric toy airplanes, electric tools and the like. In addition to improving the performance of the battery cell, the reliability of the battery cell is also a problem to be considered in the development of battery technology. Therefore, how to improve the reliability of the battery cell is a problem to be solved in the battery technology. Disclosure of Invention In view of the above, the present application provides a battery cell, a battery device, an energy storage system and a charging network, which can reduce the risk of explosion and ignition of the battery cell during thermal runaway by actively clamping a voltage difference, and has higher reliability. In a first aspect, an embodiment of the application provides a battery unit, which comprises a housing, an electrode assembly, an electrode terminal, a pressure release mechanism and a protection module, wherein the housing is provided with a containing cavity, the electrode assembly is contained in the containing cavity and comprises a first electrode lug and a second electrode lug which are opposite in polarity, the electrode terminal is arranged on the housing and comprises the first electrode terminal and the second electrode terminal which are opposite in polarity, the first electrode terminal is connected with the first electrode lug to form a first lead-out assembly, the second electrode terminal is connected with the second electrode lug to form a second lead-out assembly, the pressure release mechanism is arranged on the housing, the protection module is connected between a first target piece and a second target piece, the first target piece is one of the first lead-out assembly, the second lead-out assembly and the pressure release mechanism, the second target piece is the other one of the first lead-out assembly, the second lead-out assembly and the pressure release mechanism, and the protection module is configured to balance respective voltages on the first target piece and the second target piece. According to the technical scheme, the protection module is arranged between the first target piece and the second target piece, the first target piece is one of the first leading-out component, the second leading-out component and the pressure release mechanism, and the second target piece is the other of the first leading-out component, the second leading-out component and the pressure release mechanism, so that when the battery monomer structure is changed due to thermal abuse testing or thermal runaway, the voltage difference between the first target piece and the second target piece can be actively clamped under the voltage difference of the breakdown air by the protection module, the risk of point discharge between the first target piece and the second target piece is reduced, the thermal runaway situation is relieved, and the reliability of the battery monomer is improved. In some embodiments, the protection module includes a capacitor for storing charge when a voltage difference is generated between the first target and the second target, and a resistor for consuming charge when the capacitor discharges, connected in sequence. The protection module comprises a capacitor and a resistor, wherein the capacitor has a straightening effect, the protection module is in an open circuit state in a normal working state of a battery cell, charges generated between a first target piece and a second target piece are collected and stored when an insulating piece fails, a voltage difference between the first target piece and the second target piece is clamped under a minimum voltage difference of breakdown air, the risk of tip discharge of the lower potential between the first target piece and the second target piece is reduced, and the resistor can be used for consuming charges and converting the charges into heat energy when the capacitor discharges, so that soft landing of energy is realized. In some embodiments, the time constant of the protection module is greater than the ripple period of the battery cell during charge and discharge and the time constant of the protection module is less than the failure time of the housing when thermal abuse or thermal runaway of the battery cell occurs, wherein the time constant is configured to characterize the product of the capacitance of the capacitor and the resistance of the resistor in the protection module. The time constant reflects the response speed of the protection mo