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EP-4742493-A1 - BATTERY PROTECTION SYSTEM AND BATTERY PROTECTION METHOD

EP4742493A1EP 4742493 A1EP4742493 A1EP 4742493A1EP-4742493-A1

Abstract

The present application relates to the field of energy storage technology, and in particular, to a battery protection system and a battery protection method. The battery protection method includes: acquiring a cell data; generating a first protection instruction according to the cell data when the cell data satisfies a first condition; controlling the protection switch in the battery protection system to be disconnected in response to the first protection instruction; acquiring a first hardware protection signal when the cell data satisfies a second condition; controlling the protection switch to be disconnected according to the first hardware protection signal. Through a hardware protection and a software protection, a dual protection of a battery pack is achieved, and a safety and reliability of an operation of the battery pack is improved.

Inventors

  • YANG, XINGXING
  • SONG, Su
  • LI, Xinfu

Assignees

  • Solax Power Network Technology (Zhejiang) Co., Ltd.

Dates

Publication Date
20260513
Application Date
20251024

Claims (15)

  1. A battery protection system (1000), comprising: a control device (100) and battery pack(s), wherein the battery pack comprises a cell sampling chip (20), a first software protection module (21) and a first hardware protection module (22), the first software protection module (21) and the first hardware protection module (22) are both electrically connected to the cell sampling chip (20), the control device (100) comprises a protection switch (10), a second software protection module (11) and a second hardware protection module (12), the second software protection module (11) and the second hardware protection module (12) are both electrically connected to the protection switch (10), the first software protection module (21) and the second software protection module (11) are communicatively connected, and the first hardware protection module (22) and the second hardware protection module (12) are electrically connected, wherein the cell sampling chip (20) acquires cell data, and sends the cell data to the first software protection module (21) and the first hardware protection module (22); when the cell data satisfies a first condition, the first software protection module (21) generates a first protection instruction according to the cell data and sends the first protection instruction to the second software protection module (11); the second software protection module (11) controls the protection switch (10) to be disconnected in response to the first protection instruction; when the cell data satisfies a second condition, the first hardware protection module (22) acquires a first hardware protection signal, and sends the first hardware protection signal to the second hardware protection module (12); and the second hardware protection module (12) controls the protection switch (10) to be disconnected according to the first hardware protection signal.
  2. The battery protection system (1000) according to claim 1, wherein the first software protection module (21) and the first hardware protection module (22) are electrically connected; the first hardware protection module (22) transmits the first hardware protection signal to the first software protection module (21); and the first software protection module (21) generates the first protection instruction according to the first hardware protection signal.
  3. The battery protection system (1000) according to claim 1 or 2, wherein when it is determined that the cell data satisfies the second condition, the first software protection module (21) generates a second hardware protection signal according to the cell data, and sends the second hardware protection signal to the first hardware protection module (22).
  4. The battery protection system (1000) according to claim 3, wherein the first hardware protection module (22) comprises a first drive module, the first software protection module (21) and the first drive module are electrically connected; the first drive module determines a target hardware protection signal according to the first hardware protection signal and the second hardware protection signal, and sends the target hardware protection signal to the second hardware protection module (12); and the second hardware protection module (12) controls the protection switch (10) to be disconnected according to the target hardware protection signal.
  5. The battery protection system (1000) according to any one of claims 1 to 4, wherein the second software protection module (11) and the second hardware protection module (12) are electrically connected; the second hardware protection module (12) sends the first hardware protection signal to the second software protection module (11); and the second software protection module (11) receives the first hardware protection signal and controls the protection switch (10) to be disconnected according to the first hardware protection signal.
  6. The battery protection system (1000) according to claim 5, wherein the control device (100) further comprises a second drive module (13), an output end of the second software protection module (11) and an output end of the second hardware protection module (12) are both electrically connected to an input end of the second drive module (13), and an output end of the second drive module (13) is electrically connected to the protection switch (10) to control the protection switch (10) to be disconnected.
  7. The battery protection system (1000) according to claim 2, wherein: if it is determined that the cell data is within a first threshold range, the first software protection module (21) determines that the cell data satisfies the first condition.
  8. The battery protection system (1000) according to claim 7, wherein: if it is determined that the cell data is within a second threshold range, the first software protection module (21) determines that the cell data satisfies the second condition.
  9. The battery protection system (1000) according to any one of claims 1 to 8, wherein: the first software protection module (21) sends the cell data to the second software protection module (11); and the second software protection module (11) receives the cell data, and when it is determined that the cell data satisfies the first condition, generates a second protection command and controls the protection switch (10) to be disconnected according to the second protection command.
  10. A battery protection method, wherein the battery protection method uses the battery protection system (1000) according to any one of claims 1 to 9 to protect the battery pack in the battery protection system (1000), and the battery protection method comprises: acquiring a cell data; generating a first protection instruction according to the cell data when the cell data satisfies a first condition; controlling the protection switch (10) in the battery protection system (1000) to be disconnected in response to the first protection instruction; acquiring a first hardware protection signal when the cell data satisfies a second condition; and controlling the protection switch (10) to be disconnected according to the first hardware protection signal.
  11. The battery protection method according to claims 10, wherein the battery protection method further comprises: in a case that the cell data is within a first threshold range, determining that the cell data satisfies the first condition.
  12. The battery protection method according to claims 10 or 11, wherein the battery protection method further comprises: in a case that the cell data is within a second threshold range, determining that the cell data satisfies the second condition.
  13. The battery protection method according to any one of claims 10 to 12, wherein the first software protection module (21) and the first hardware protection module (22) are electrically connected, and the battery protection method comprises: transmitting, by the first hardware protection module (22), the first hardware protection signal to the first software protection module (21); and generating, by the first software protection module (21) based on the first hardware protection signal, the first protection instruction.
  14. The battery protection method according to any one of claims 10 to 13, wherein the battery protection method further comprises: in a case that the cell data satisfies the second condition, generating, by the first software protection module (21) based on the cell data, a second hardware protection signal; transmitting, by the first software protection module (21), the second hardware protection signal to the first hardware protection module (22).
  15. The battery protection method according to claim14, wherein the first hardware protection module (22) comprises a first drive module, the first software protection module (21) and the first drive module are electrically connected, the battery protection method comprises: determining, by the first drive module based on the first hardware protection signal and the second hardware protection signal, a target hardware protection signal; transmitting, by the first drive module, the target hardware protection signal to the second hardware protection module (12); and controlling, by the second hardware protection module (12) based on the target hardware protection signal, the protection switch (10) to be disconnected.

Description

TECHNICAL FIELD The present invention relates to the field of energy storage technology, and in particular, to a battery protection system and a battery protection method. BACKGROUND As an apparatus for storing electrical energy, a battery pack is internally composed of multiple battery cells (such as lithium-ion batteries, lead-acid batteries, and the like.) through specific connection manners and structures, and has an ability to store and release electrical energy. This ability to store and release electrical energy enables the battery pack to be applied in various fields such as power systems, portable electronic devices, electric vehicles, and renewable energy generation. However, under conditions such as overcharging (abbreviated as overcharge), over-discharging (abbreviated as overdischarge), excessively high or low battery cell temperatures (abbreviated as overtemperature), or charging/discharging at high-temperature or low-temperature, a lifespan and safety of the battery will be severely affected and even prone to safety issues such as fire or explosion. Therefore, battery protection is critical to ensure the normal, safe, and stable operation of the entire battery pack. SUMMARY In view of this, the present invention provides a battery protection system and battery protection method to solve the problem that the lifespan and safety of the battery will be severely affected and even prone to fire or explosion in situations such as battery pack in overcharging, over-discharging, or over-temperature, charging/discharging at high-temperature or low-temperature. A first aspect of the embodiments of the present invention provides a battery protection system, the battery protection system includes a control device and battery back(s), where the battery pack includes a cell sampling chip, a first software protection module and a first hardware protection module, the first software protection module and the first hardware protection module are both electrically connected to the cell sampling chip, the control device includes a protection switch, a second software protection module and a second hardware protection module, the second software protection module and the second hardware protection module are both electrically connected to the protection switch, the first software protection module and the second software protection module are communicatively connected, and the first hardware protection module and the second hardware protection module are electrically connected, where the cell sampling chip acquires cell data, and sends the cell data to the first software protection module and the first hardware protection module; when the cell data satisfies a first condition, the first software protection module generates a first protection instruction according to the cell data and sends the first protection instruction to the second software protection module; the second software protection module controls the protection switch to be disconnected in response to the first protection instruction; when the cell data satisfies a second condition, the first hardware protection module acquires a first hardware protection signal, and transmits the first hardware protection signal to the second hardware protection module; and the second hardware protection module controls the protection switch to be disconnected according to the first hardware protection signal. In some embodiments, the first software protection module and the first hardware protection module are electrically connected; the first hardware protection module transmits the first hardware protection signal to the first software protection module; and the first software protection module generates the first protection instruction according to the first hardware protection signal. In some embodiments, when it is determined that the cell data satisfies the second condition, the first software protection module generates a second hardware protection signal according to the cell data, and sends the second hardware protection signal to the first hardware protection module. In some embodiments, the first hardware protection module includes a first drive module, the first software protection module and the first drive module are electrically connected; the first drive module determines a target hardware protection signal according to the first hardware protection signal and the second hardware protection signal, and sends the target hardware protection signal to the second hardware protection module; and the second hardware protection module controls the protection switch to be disconnected according to the target hardware protection signal. In some embodiments, the second software protection module and the second hardware protection module are electrically connected; the second hardware protection module sends the first hardware protection signal to the second software protection module; and the second software protection module receives the first hardware prot