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CN-122003792-A - Reusable protection device for protecting rechargeable batteries and method for operating such a protection device

CN122003792ACN 122003792 ACN122003792 ACN 122003792ACN-122003792-A

Abstract

The invention relates to a reusable protection device (V) for protecting a rechargeable battery (10) from overheating when charged by a charger (12). The protection device comprises a first housing element (3) having an electrical circuit (B) with an electrical first switch (4), and a second housing element (1) rotatably connected to the first housing element, wherein the two housing elements are rotatable between a closed position and an open position. A strap (9) is also provided, which can be fastened with one end to the first housing element and is held in a guided manner in the second housing element, so that a loop (9 a) is formed between the strap and the battery side, in which loop the battery to be charged can be firmly fastened. The first switch is closed only in the closed position, so that a current loop for charging the battery can be closed. When the actual volume of the battery exceeds the rated volume of the battery, the current circuit can be interrupted and the second housing element can be rotated by means of the torque caused by the battery expanding as a result of the volume increase and acting on the second housing element by the tensioned and stopped belt.

Inventors

  • ROUSSE MARTINE

Assignees

  • 马丁·鲁斯

Dates

Publication Date
20260508
Application Date
20231010

Claims (17)

  1. 1. A reusable protection device (V) for protecting a rechargeable battery (10) from overheating when charged by a charger (12), wherein the protection device has an electrical terminal (10 a) such that the poles of the battery and the same poles of the charger can communicate to the protection device, the protection device further comprising A first housing element (3) having an electrical circuit (B) with an electrical first switch (4), A second housing element (1) rotatably connected to the first housing element by means of a first rotary joint (1 a) arranged on a battery side (3 a) of the first housing element, wherein both housing elements are rotatable between a closed position in which they abut each other and an open position, wherein the housing elements are retainable in the closed position by means of a restraining force caused by a restraining device, A strap (9) which can be fastened at one end to the first housing element and can be held in a guided manner in the second housing element such that a loop (9 a) is formed between the strap and the battery side, in which loop a battery to be charged can be accommodated, wherein the strap can be tensioned and can be stopped in the second housing element such that the battery is firmly fastened at the battery side of the first housing element, Wherein the first switch is open in a stationary state and is closed only in the closed position, wherein by closing the first switch, a pole of the charger can be electrically connected to the same pole of the battery, so that when the battery is connected to the charger as specified, a current circuit for charging the battery can be closed, Wherein the current circuit can be interrupted when the actual volume of the battery exceeds the nominal volume of the battery during continuous charging of the fixed battery, the second housing element being rotatable about the first rotary joint against the restraining force by means of a torque caused by the battery expanding as a result of the volume increase and acting on the second housing element via the tensioned and stopped belt, whereby the housing element can be transferred from the closed position to one of the open positions and whereby the first switch can be opened.
  2. 2. A reusable protection device for protecting a rechargeable battery from overheating when charged by a charger, wherein the protection device has electrical terminals such that poles of the battery and the same poles of the charger can communicate to the protection device, the protection device further comprising A first housing element having an electrical circuit with an electrical first switch (4) and a circuit breaker line (14) connected in series with the first switch, A second housing element rotatably connected to the first housing element by means of a first rotary joint arranged on the battery side of the first housing element, wherein the two housing elements are rotatable between a closed position in which the two housing elements abut each other and an open position, wherein the housing elements are retainable in the closed position by means of a restraining force caused by a restraining device, A strap which can be fastened at one end to the first housing element and can be held guidably in the second housing element such that a loop is formed between the strap and the battery side, in which loop a battery to be charged can be accommodated, wherein the strap can be tensioned and can be stopped in the second housing element such that the battery is firmly fastened at the battery side of the first housing element, Wherein the first switch is open in the rest state and is closed only in the closed position of the housing element, and wherein the interrupter circuit is electrically conductive in the rest state independently of the position of the housing element, such that when the first switch is closed and the interrupter circuit conducts current, a pole of the charger can be electrically connected to the same pole of the battery, such that when the battery is connected to the charger as specified, a current circuit for charging the battery can be closed, Wherein the current loop can be interrupted when during continuous charging of the fixed battery: The nominal volume of the battery is exceeded by the actual volume of the battery, the second housing element is rotatable about the first rotary joint against the restraining force by means of a torque caused by the battery expanding due to the volume increase and acting on the second housing element via the tensioned and stopped belt, whereby the housing element is transferable from the closed position to one of the open positions and whereby the switch is openable to interrupt the current circuit, and/or The maximum permissible temperature of the battery during charging is exceeded, and the current circuit can thus be interrupted by means of the circuit breaker.
  3. 3. Protection device according to claim 2, wherein the breaker circuit is a bimetal switch which is arranged directly at the battery side of the first housing element and is designed such that it interrupts the current circuit when a fixed limit temperature is reached, or Wherein the circuit breaker circuit is an electronic circuit that interrupts the current loop when a programmable limit temperature is reached.
  4. 4. Protection device according to one of the preceding claims, wherein the second housing element comprises a carrier (1) which is fixed at the first housing element by means of the first rotary joint, wherein a first side (1 c) of the carrier is in abutment to a first side (3 b) of the first housing element in the closed position and is not in abutment to the first side of the first housing element in the open position.
  5. 5. Protection device according to claim 4, wherein the second housing element comprises a tape guide element (2) which is rotatably fastened in the carrier body relative to the carrier body, wherein a first side of the tape guide element (2) faces the first side of the first housing element and is formed by a first face section (2 a) and a second face section (2 b), wherein the two face sections do not lie in the same plane, wherein by rotation of the tape guide element relative to the carrier body the first face section or the second face section can be oriented parallel to the first side of the first housing element, Wherein when the first face section is oriented in parallel, the first face section lies in the same plane as the first side of the carrier body and, only in the closed position, the first side of the carrier body together with the first face section of the tape guide element is adjacent to the first side of the first housing element, Wherein, when the second face sections are oriented in parallel, the second face sections protrude beyond the plane of the first side of the carrier element in the direction of the first side of the first housing element and abut the first side of the first housing element in an open intermediate position as a spacer with the first side of the carrier element such that the closed position of the housing element cannot be occupied.
  6. 6. Protection device according to claim 5, wherein the restraining device comprises two first magnets (6, 6.1), wherein the first housing element has one of the two first magnets at the first side and the tape guide element has one of the two first magnets at a second section, respectively, wherein the first magnets are arranged to attract each other, Wherein the first magnets are arranged in parallel and provide a maximum attractive force in the open intermediate position, an And providing said restraining force in said closed position, said restraining force being less than said maximum attractive force.
  7. 7. The protective apparatus according to claim 5 or 6, wherein the tape is guided in the tape guide element such that a rotation of the tape guide element that orients the first face section parallel to the first side of the first housing element corresponds to an increase of the ring and a rotation of the tape guide element that orients the second face section parallel to the first side of the first housing element corresponds to a decrease of the ring.
  8. 8. The protection device according to claim 7, wherein the protection device is designed such that the fixing of the battery can only be performed in the closed position of the housing element.
  9. 9. Protection device according to one of the preceding claims, wherein the first housing element comprises a button (5) operable by a user of the protection device, wherein the button is not pressed in a stationary state, wherein the housing element can be transferred to the closed position only when the button is pressed.
  10. 10. The protection device according to claim 9, wherein a pressed button can be permanently stopped during a prescribed charging of the battery and can only be released when transferring the housing element from the closed position to one of the open positions in case of an increase in the volume of the battery, so that the button enters a stationary state.
  11. 11. Protection device according to claim 10, wherein the carrier of the second housing element comprises a locking pin (7) protruding so far from the first side that its free end is located in a recess (5 a) in the first housing element in the closed position, wherein the recess is accessible for the locking pin only when the button is in the pressed button state, and wherein the recess is arranged such that the button can be locked in the pressed button state.
  12. 12. Protection device according to one of the preceding claims, wherein the second housing element further comprises a clamping lever (8) rotatably supported in the tape guide element with respect to the tape guide element for stopping the tape.
  13. 13. Protection device according to claims 12 and 6, wherein the clamping bar comprises a second magnet (6.2) arranged such that it is attracted to the first magnet of the tape guide element.
  14. 14. The protection device according to one of the preceding claims and claim 6, wherein the actual volume of the battery, during the continuous charging of the battery, until the current loop can be interrupted by transferring the housing part from the closed position to one of the open positions, is allowed to exceed a nominal volume by a percentage adjustable according to the strength of the first magnet.
  15. 15. A method for protecting a rechargeable battery from overheating when charged by a charger by means of a protection device according to one of the preceding claims, comprising the steps of: a) Connecting the poles of the battery to a first electrical terminal of the protection device and connecting the same poles of the charger to a second terminal of the protection device, B) The battery is introduced into the ring and, C) Tensioning the strap to bring the housing element to the closed position by pulling the strap in a direction away from the second housing element and towards the first housing element, wherein at the same time the battery is firmly fixed at the battery side of the first housing element, D) Stopping the strap when the housing member is brought to the closed position, an E) The other poles of the battery are directly connected to the same other poles of the charger.
  16. 16. The method according to claim 15 and claim 7, wherein an intermediate step is performed after or during step c): c1 Pressing the button and maintaining the button pressed until the housing element is brought to the closed position.
  17. 17. Use of a protection device according to one of claims 1 to 14 for protecting a lithium polymer battery during charging.

Description

Reusable protection device for protecting rechargeable batteries and method for operating such a protection device Technical Field The present invention relates to a reusable protection device for protecting rechargeable batteries and to a method of operating such a protection device, respectively, according to the respective independent claims. Background Rechargeable batteries are known. They are available in a number of different embodiments. Here, the shape and size may vary greatly depending on the application. In addition, such batteries differ in their electrical properties, for example in charging time, energy density, efficiency, etc. These properties depend on the materials used. The most well known batteries include, inter alia, lithium ion batteries, which may be further subdivided, such as lithium polymer batteries (LiPo), lithium manganese batteries (LiMn), etc. In general, for a storage battery, a charging process may be problematic due to heat generated by energy input. This may lead to overheating of the battery cells or, for example in the case of LiPo batteries, to "swelling" of the battery cells, which may be caused in particular by overload or complete discharge when such battery cells are damaged, for example. In the worst case, it may lead to an explosion or fire of the battery cells, which must of course be prevented in any case in order to avoid a potential hazard to the user and damage to the battery. For this purpose, protection schemes have been developed for different battery types. While complex computer-aided protection systems with intelligent charging cycles have been developed for larger batteries, such as those used in electric vehicles, these solutions cannot be used for small batteries, such as those typically found in remote model aircraft, because these protection systems are on the one hand too large, too heavy and on the other hand too expensive. Solutions have also been developed for such "small-size" applications. For example, for LiPo batteries, there are devices that interrupt the charging current when the battery expands by breaking the metal strap as the volume increases, thereby interrupting the current loop. The disadvantage of this solution is that the protection device can only be used once. Other solutions, particularly in model building vehicles where weight is not an important issue, use hard shell batteries, where the problem of expansion is small. Fewer battery cells are used, as is the case in children applications. Disclosure of Invention It is an object of the present invention to provide an improved protection device, in particular a reusable protection device. This object is achieved in a first aspect of the invention by a reusable protection device for protecting a rechargeable battery from overheating when charged by a charger. The protection device has electrical terminals so that the poles of the battery and the same poles of the charger can be connected to the protection device. The protection device further comprises a first housing element having an electrical circuit with an electrical first switch, and a second housing element rotatably connected to the first housing element by means of a first rotary joint arranged on the battery side of the first housing element, wherein the two housing elements are rotatable between a closed position in which the two housing elements abut each other and an open position, wherein the housing elements are retainable in the closed position by means of a restraining force caused by the restraining device. Finally, the protection device comprises a strap which can be fastened with one end to the first housing element and which can be held in a guided manner in the second housing element, so that a loop is formed between the strap and the battery side, in which loop the battery to be charged can be accommodated. The belt can be tensioned and can be stopped in the second housing element, so that the battery is firmly fixed at the battery side of the first housing element. The first switch is open in a stationary state and closed only in a closed position. By closing the first switch, the poles of the charger can be electrically connected to the same poles of the battery, so that when the battery is connected to the charger as prescribed, the current loop for charging the battery can be closed. When the actual volume of the battery exceeds the nominal volume of the battery during the continuous charging of the fixed battery, the current circuit can be interrupted, the second housing element can be rotated about the first rotary joint against the restraining force by means of the torque caused by the battery expanding due to the volume increase and acting on the second housing element by means of the tensioned and stopped belt, whereby the housing element can be transferred from the closed position to one of the open positions and the first switch can thus be opened. This object is achieved in a second aspect o