Search

WO-2026091035-A1 - BATTERY DEVICE AND ELECTRIC APPARATUS

WO2026091035A1WO 2026091035 A1WO2026091035 A1WO 2026091035A1WO-2026091035-A1

Abstract

Provided in the embodiments of the present application are a battery device and an electric apparatus. The battery device comprises: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly among the plurality of battery cell assemblies comprises a plurality of battery cells connected in parallel, and the plurality of battery cells comprise a first battery cell and a second battery cell; and a current-limiting element, wherein the current-limiting element is located on a circuit formed by the first battery cell and the second battery cell. The battery device and the electric apparatus in the embodiments of the present application can improve the reliability of the battery device.

Inventors

  • WANG, LIANG
  • PU, YUJIE
  • LI, YAO
  • KONG, Xiaohui

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260507
Application Date
20241031

Claims (20)

  1. A battery device, characterized in that it comprises: A series of battery cell assemblies (200), wherein a first battery cell assembly (210) of the series of battery cell assemblies (200) includes a series of battery cells (20) connected in parallel, wherein the series of battery cells (20) includes a first battery cell (201) and a second battery cell (202); A current limiting element (12133) is located on the circuit formed by the first battery cell (201) and the second battery cell (202).
  2. According to claim 1, the battery device is characterized in that the sum of the resistance values of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) ranges from [0.15Ω, 75Ω].
  3. The battery device according to claim 2, characterized in that the first battery cell (201) and the second battery cell (202) satisfy at least one of the following conditions: The capacity of the first battery cell (201) ranges from [20Ah, 88Ah]; The capacity of the second battery cell (202) ranges from [20Ah, 88Ah]; The mass of the first battery cell (201) ranges from [0.37 kg to 1.6 kg]. The mass of the second battery cell (202) ranges from 0.37 kg to 1.6 kg.
  4. The battery device according to any one of claims 1 to 3 is characterized in that the capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [35Ah, 50Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.25kg, 0.75kg]; and the sum of the resistance values of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.28Ω, 30Ω].
  5. The battery device according to any one of claims 1 to 3 is characterized in that the capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [15Ah, 30Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.27kg, 0.78kg]; and the sum of the resistance values of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.25Ω, 60Ω].
  6. The battery device according to any one of claims 1 to 3 is characterized in that the capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [9Ah, 23Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.13kg, 0.6kg]; and the sum of the resistance values of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.3Ω, 75Ω].
  7. The battery device according to any one of claims 1 to 3 is characterized in that the capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [12Ah, [30Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [0.28 kg, 0.52 kg], and the sum of the resistance values of all the current limiting elements (12133) set on the circuit formed by the first battery cell (201) and the second battery cell (202) is [0.28 Ω, 60 Ω].
  8. The battery device according to any one of claims 1 to 3 is characterized in that the capacity range of the first battery cell (201) and the capacity range of the second battery cell (202) are both [73Ah, 102Ah]; the mass range of the first battery cell (201) and the mass range of the second battery cell (202) are both [1.1kg, 2.1kg]; and the sum of the resistance values of all the current limiting elements (12133) provided on the circuit formed by the first battery cell (201) and the second battery cell (202) is in the range of [0.15Ω, 15Ω].
  9. The battery device according to any one of claims 1 to 8, characterized in that the battery device further comprises: The first busbar component (121) is used to connect the positive electrode of the first battery cell (201) and the positive electrode of the second battery cell (202); The second busbar component (122) is used to connect the negative terminal of the first battery cell (201) and the negative terminal of the second battery cell (202); Wherein, at least one of the first busbar component (121) and the second busbar component (122) includes the current limiting element (12133).
  10. The battery device according to claim 9, wherein each of the at least one busbar includes a first connecting part (1211), a second connecting part (1212), and a safety part (1213), the first connecting part (1211) being connected to the first battery cell (201), the second connecting part (1212) being connected to the second battery cell (202), the safety part (1213) being located between the first connecting part (1211) and the second connecting part (1212), and the safety part (1213) including the current limiting element (12133).
  11. The battery device according to claim 10, wherein each busbar component further comprises: A protective component (1214) is provided to protect the connection between the first connecting part (1211) and the safety part (1213), and/or to protect the connection between the second connecting part (1212) and the safety part (1213).
  12. The battery device according to claim 10 or 11 is characterized in that the safety part (1213) and the first connecting part (1211) are fixed together by welding; and/or, The safety part (1213) and the second connecting part (1212) are fixed together by welding.
  13. The battery device according to any one of claims 1 to 12 is characterized in that the current limiting element (12133) comprises at least one of the following: a capacitor, a bonding resistor, a resistance wire, and a diaphragm resistor.
  14. The battery device according to any one of claims 1 to 13, characterized in that the first battery cell (201) comprises: The outer casing (21) includes a first wall (2101); Electrode terminals (214) are disposed on the first wall (2101); An insulating structure (24) is disposed between the electrode terminal (214) and the first wall (2101) to isolate the electrode terminal (214) from the first wall in the event of thermal runaway of the first battery cell (201). (2101).
  15. The battery device according to claim 14, wherein the first battery cell (201) further comprises: Electrode assembly (22) is housed within the housing (21); A connecting member (23) is used to electrically connect the electrode terminal (214) and the first tab (2221) of the electrode assembly (22); The insulating structure (24) is also located between the connecting member (23) and the first wall (2101) for isolating the connecting member (23) from the first wall (2101) in the event of thermal runaway of the first battery cell (201).
  16. The battery device according to claim 15 is characterized in that the second tab (2222) of the electrode assembly (22) is electrically connected to the first wall (2101), and the second tab (2222) has the opposite polarity to the first tab (2221).
  17. The battery device according to any one of claims 14 to 16, characterized in that the battery device further comprises: A third busbar (123) is used for electrical connection with the electrode terminal (214); The insulating structure (24) is also located between the first wall (2101) and the third busbar (123) for isolating the first wall (2101) and the third busbar (123) in the event of thermal runaway of the first battery cell (201).
  18. The battery device according to any one of claims 14 to 17, characterized in that the housing (21) comprises: The shell (211) has a hollow structure with an opening (2111); A cover plate (212) for covering the opening (2111), the cover plate (212) including the first wall (2101).
  19. The battery device according to any one of claims 14 to 18 is characterized in that the melting point of the insulating structure (24) is greater than or equal to 400°C.
  20. The battery device according to any one of claims 14 to 19 is characterized in that the material of the insulating structure (24) includes at least one of the following: ceramic, glass fiber and polytetrafluoroethylene.

Description

Battery devices and electrical equipment Technical Field This application relates to the field of battery technology, and in particular to a battery device and an electrical appliance. Background Technology Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development. To increase the capacity of a battery device, multiple battery cells can be electrically connected in a parallel configuration. However, if any one of these cells experiences thermal runaway, the short-circuit current will generate a large amount of heat, leading to heat dissipation between the parallel-connected cells and posing a safety hazard. Summary of the Invention This application provides a battery device and an electrical appliance that can improve the reliability of the battery device. In a first aspect, a battery device is provided, comprising: a plurality of battery cell assemblies connected in series, wherein a first battery cell assembly comprises a plurality of battery cells connected in parallel, the plurality of battery cells including a first battery cell and a second battery cell; and a current limiting element located on a circuit formed by the first battery cell and the second battery cell. Therefore, in the battery device of this application embodiment, even if the thermally runaway battery cell is close to a short circuit and is equivalent to a resistor with a very small resistance, the current in the circuit between the first and second battery cells connected in parallel can be limited to not be too large in the case of thermal runaway of the first or second battery cell, thus reducing the risk of short circuit and thereby reducing the risk of thermal diffusion and improving the reliability of the battery device. In some embodiments, the sum of the resistance values of all the current-limiting elements provided in the circuit formed by the first and second battery cells ranges from [0.15Ω to 75Ω]. At least one current-limiting element can be provided in the circuit formed by the first and second battery cells, and the sum of the resistance values of this at least one current-limiting element should not be too small. For example, the sum of the resistance values is typically set to be greater than or equal to 0.15Ω. In the event of thermal runaway in either the first or second battery cell, the short-circuit current in the circuit between the first and second battery cells can be limited to prevent excessive current, reducing the risk of thermal diffusion in the battery device and improving its reliability. Conversely, the sum of the resistance values of this at least one current-limiting element should not be too large either. For example, the sum of the resistance values is typically set to be less than or equal to 75Ω. In this case, when a voltage difference occurs between the parallel-connected first and second battery cells, the balancing current is smaller, and the battery device can self-balance the voltage difference in a shorter time, meeting design requirements. In some embodiments, the first battery cell and the second battery cell satisfy at least one of the following conditions. The capacity of the first battery cell ranges from [20Ah to 88Ah]; the capacity of the second battery cell ranges from [20Ah to 88Ah]; the mass of the first battery cell ranges from [0.37kg to 1.6kg]; and the mass of the second battery cell ranges from [0.37kg to 1.6kg]. When the first and second battery cells meet any of the above conditions, the sum of the resistance values of at least one current-limiting element in the circuits of the first and second battery cells can be set to range from [0.075Ω to 37.5Ω] to ensure that the current in the circuits of the first and second battery cells meets the design requirements. In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [35Ah, 50Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.25kg, 0.75kg]; and the sum of the resistance values of all the current limiting elements provided in the circuit formed by the first battery cell and the second battery cell is [0.28Ω, 30Ω]. In some embodiments, the capacity range of the first battery cell and the capacity range of the second battery cell are both [15Ah, 30Ah]; the mass range of the first battery cell and the mass range of the second battery cell are both [0.27kg, 0.78kg]; and the sum of the resistance values of all the current limiting elements provided on the circuit formed by the first battery cell and the second battery cell is [0.25Ω, 60Ω]. In some embodiments, the capacity range of the f