Battery pack cover opening detection system, battery pack structure and electric equipment

Abstract

The utility model belongs to the technical field of battery pack detection, and relates to a battery pack uncovering detection system, a battery pack structure and electric equipment. The battery pack uncovering detection system comprises an energy acquisition device and an uncovering detection device, and the energy acquisition device is used for converting acquired external energy into electric energy to supply power to the uncovering detection device; and the uncovering detection device is used for acquiring uncovering information of the battery pack. The battery pack cover opening detection system can ensure that the cover opening detection device records the cover opening signal of the battery pack under the condition of no external power supply.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack detection, and particularly relates to a battery pack opening detection system, a battery pack structure and an electrical device. Background Art

[0002] The existing anti-theft system of a battery pack usually obtains power from an electrical device through a power conversion device. If the battery pack is removed from the electrical device, the anti-theft system of the battery pack will not be able to record the battery pack opening signal without external power supply. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is: aiming at the technical problem that the existing anti-theft system of a battery pack cannot record the battery pack opening signal without external power supply, a battery pack opening detection system, a battery pack and an electrical device are provided.

[0004] To solve the above technical problem, on the one hand, an embodiment of the utility model provides a battery pack opening detection system, including:

[0005] An opening detection device, configured to obtain the opening information of the battery pack;

[0006] An energy acquisition device, configured to convert the acquired external energy into electric energy to supply power to the opening detection device.

[0007] According to the battery pack opening detection system of the embodiment of the utility model, the acquired external energy is converted into electric energy by the energy acquisition device to supply power to the opening detection device, so as to ensure that the opening detection device records the battery pack opening signal without external power supply.

[0008] Optionally, the external energy is one or a combination of more of electromagnetic energy, light energy and mechanical energy.

[0009] Optionally, the battery pack opening detection system further includes a battery management system, the opening detection device is communicatively connected to the battery management system, and the battery management system is configured to receive the opening information of the battery pack acquired by the opening detection device.

[0010] Optionally, a certificate verification and signature module is provided between the opening detection device and the battery management system.

[0011] Optionally, the opening detection device includes an opening detection module and a first security module, the opening detection module is communicatively connected to the first security module, and the opening detection module is configured to obtain the opening information of the battery pack;

[0012] A second security module is provided on the battery management system;

[0013] The first security module and the second security module are communicatively connected to form the certificate verification and signature module.

[0014] Optionally, the first security module is configured to receive the battery pack opening information obtained by the opening detection module and encrypt and store the battery pack opening information.

[0015] The battery management system is configured to receive the battery pack opening information encrypted and stored by the first security module.

[0016] Optionally, the battery pack opening detection system further includes a contactor. The battery management system is communicatively connected to the contactor, and the battery management system is further configured to control the closing or opening of the contactor according to the received battery pack opening information.

[0017] When the contactor is closed, the battery pack is in an enabled state; when the contactor is open, the battery pack is in a disabled state.

[0018] Optionally, the contactor opens when the battery pack is opened and closes when the battery pack is not opened.

[0019] Optionally, the battery pack opening detection system further includes a management device, and the management device is configured to clear the battery pack opening information obtained by the opening detection device.

[0020] Optionally, a security access module is provided between the opening detection device, the battery management system, and the management device.

[0021] Optionally, the battery pack opening detection system further includes a power conversion device, and the power conversion device is electrically connected to the opening detection device;

[0022] The power conversion device is adapted to be electrically connected to a power supply, and the power conversion device is configured to convert the electrical energy of the power supply into electrical energy suitable for use by the opening detection device.

[0023] Optionally, the battery pack opening detection system further includes a power conversion device, and the power conversion device is electrically connected to the battery management system;

[0024] The power conversion device is adapted to be electrically connected to a power supply, and the power conversion device is configured to convert the electrical energy of the power supply into electrical energy suitable for use by the battery management system.

[0025] Optionally, the battery pack opening detection system further includes a power conversion device, and the power conversion device is electrically connected to the opening detection device and the battery management system;

[0026] The power conversion device is adapted to be electrically connected to a power supply, and is used to convert the electrical energy of the power supply into electrical energy suitable for use by the opening detection device and the battery management system.

[0027] On the other hand, an embodiment of the present invention provides a battery pack structure, which includes a battery pack and the above-mentioned battery pack opening detection system.

[0028] On yet another aspect, an embodiment of the present invention provides an electrical device, which includes the above-mentioned battery pack opening detection system or the above-mentioned battery pack structure. Description of the Drawings

[0029] Figure 1 is a schematic diagram of a battery pack structure provided by an embodiment of the present invention.

[0030] Figure 2 is another schematic diagram of a battery pack structure provided by an embodiment of the present invention.

[0031] The reference numerals in the specification are as follows:

[0032] 10. Battery pack; 20. Battery pack opening detection system; 30. Power supply;

[0033] 1. Energy acquisition device;

[0034] 2. Opening detection device; 21. Opening detection module; 22. First safety module;

[0035] 3. Battery management system; 31. Second safety module;

[0036] 4. Contactor;

[0037] 5. Management device;

[0038] 6. Power conversion device. Detailed Embodiments

[0039] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following further details the present invention with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] As Figure 1 and Figure 2As shown in the figure, the battery pack structure provided by the embodiment of the present invention includes a battery pack 10 and a battery pack opening detection system 20. Among them, the battery pack opening detection system 20 includes an energy acquisition device 1 and an opening detection device 2. The energy acquisition device 1 is used to convert the acquired external energy (such as a combination of one or more of electromagnetic energy, light energy, and mechanical energy) into electrical energy to supply power to the opening detection device 2. The opening detection device 2 is used to obtain the opening information of the battery pack 10.

[0041] For the battery pack structure and the battery pack opening detection system 20 provided by the embodiment of the present invention, the energy acquisition device 1 converts the acquired external energy into electrical energy to supply power to the opening detection device 2, so as to ensure the recording of the opening signal of the battery pack 10 by the opening detection device 2 without external power supply.

[0042] In one embodiment, the opening detection device 2 can select different detection devices, such as a photosensitive device, an infrared detection device, a pressure sensing device, or a mechanical pressure sensing device, etc.

[0043] In one embodiment, as Figure 1 shown, the battery pack opening detection system 20 further includes a battery management system (refer to BMS in Figure 1 ) 3. The battery management system 3 is used to receive the opening information of the battery pack 10 obtained by the opening detection device 2 to realize the communication connection between the opening detection device 2 and the battery management system 3.

[0044] In one embodiment, a certificate verification and signature module is provided between the opening detection device 2 and the battery management system 3 to enable certificate verification and signature. Specifically, the opening detection device 2 and the battery management system 3 are paired one-to-one. If the certificate verification and signature fails, the battery management system 3 cannot read or change the opening information stored in the opening detection device 2, which ensures the security of the battery pack opening detection system, avoids the malicious reading or tampering of the opening information, and reduces the product safety risk caused by unauthorized changes to the battery pack 10.

[0045] In one embodiment, as Figure 2 shown, the opening detection device 2 includes an opening detection module 21 and a first security module 22. The opening detection module 21 is communicatively connected to the first security module 22, and the opening detection module 21 is used to obtain the opening information of the battery pack 10.

[0046] A second security module 31 is provided on the battery management system 3. The first security module 22 and the second security module 31 are communicatively connected to form the certificate verification and signature module for performing the certificate verification and signature.

[0047] The battery management system 3 is used to receive the battery pack opening information obtained by the opening detection module 21 when the certificate verification is passed.

[0048] In one embodiment, the first security module 22 is used to receive the battery pack opening information obtained by the opening detection module 21 and encrypt and store the battery pack opening information.

[0049] The battery management system 3 is used to receive the battery pack opening information encrypted and stored by the first security module 22 when the certificate verification is passed.

[0050] In one embodiment, the first security module 22 is further used to encrypt the identity information of the opening detection device 2 to form security information and send the security information to the second security module 31.

[0051] The second security module 31 is used to store preset identity information, and is also used to receive and decrypt the security information, and compare the decryption result of the security information with the preset identity information to perform certificate verification.

[0052] When the decryption result of the security information is the same as the preset identity information, the certificate verification is passed, and the battery management system 3 receives the battery pack opening information encrypted and stored by the first security module 22.

[0053] In one embodiment, while the second security module 31 stores the preset identity information, it can send a random number to the first security module 22.

[0054] At this time, the first security module 22 is further used to combine and encrypt the identity information of the battery management system 3 and the received random number to form security information and send the security information to the second security module 31.

[0055] After receiving the security information, the second security module 31 receives and decrypts the security information, and compares the decryption result of the security information with the preset identity information and the random number to perform certificate verification.

[0056] When the decryption result of the security information is the same as the preset identity information and the random number, the certificate verification is passed, and the battery management system 3 receives the battery pack opening information encrypted and stored by the first security module 22.

[0057] In one embodiment, such as Figure 1 and Figure 2As shown, the battery pack opening detection system 20 further includes a contactor 4. The battery management system 3 is communicatively connected to the contactor 4. The battery management system 3 is further configured to control the closing or opening of the contactor 4 according to the received opening information of the battery pack 10.

[0058] Specifically, the opening information may include whether the battery pack 10 is opened.

[0059] When the battery pack 10 is not opened, the battery management system 3 controls the contactor 4 to close. At this time, the battery pack 10 is in an enabled state. When the battery pack 10 is opened, the battery management system 3 controls the contactor 4 to open. At this time, the battery pack 10 is in a disabled state.

[0060] By controlling the closing or opening of the contactor 4 through the battery management system 3, and further controlling whether the battery pack 10 is disabled, the use safety of the battery pack 10 can be ensured.

[0061] In one embodiment, the opening information may further include the opening times, opening duration, etc. of the battery pack 10.

[0062] In one embodiment, as Figure 1 and Figure 2 shown, the battery pack opening detection system 20 further includes a management device 5. The management device 5 is configured to clear the opening information of the battery pack 10 acquired by the opening detection device 2.

[0063] In one embodiment, the management device 5 may further be configured to update the preset identity information stored in the second security module 31.

[0064] Specifically, for different usage functions, the management device 5 may be selected as a proprietary maintenance device or a diagnostic tool.

[0065] In one embodiment, a security access module is provided between the opening detection device 2, the battery management system 3 and the management device 5. By setting security access permissions through the security access module, the possibility of malicious tampering of communication information is reduced, the security and reliability of the data stream are ensured, and the product safety risk caused by unauthorized changes to the battery pack 10 is reduced.

[0066] When the security access policy of the management device 5 passes, the 1-to-1 identity verification information between the battery management system 3 and the opening detection device 2 can be rewritten.

[0067] In one embodiment, as Figure 1 and Figure 2 shown, the battery pack opening detection system 20 further includes a power conversion device 6. The power conversion device 6 is electrically connected to the opening detection device 2 and the battery management system 3.

[0068] The power conversion device 6 is adapted to be electrically connected to an external power supply 30, and the power conversion device 6 is configured to convert the electrical energy of the power supply 30 into electrical energy suitable for use by the opening detection device 2 and the battery management system 3.

[0069] When the battery pack 10 is installed in a vehicle or there is an external power supply 30, the power conversion device 6 converts the power supply 30 into a stable power supply for the battery management system 3, the opening detection module 21, and the first safety module 22. When the battery pack 10 is removed from the vehicle and there is no external power supply 30, the power conversion device 6 does not work.

[0070] In one embodiment, the power supply 30 is a vehicle power supply or an external power supply, such as a storage battery, etc., and its output voltage is converted by the power conversion device 6 into a stable voltage to supply power to the battery management system 3 and the opening detection device 2.

[0071] In other embodiments not shown in the figure, the power conversion device may also be only electrically connected to the battery management system. The power conversion device is adapted to be electrically connected to an external power supply, and the power conversion device is configured to convert the electrical energy of the power supply into electrical energy suitable for use by the battery management system. At this time, the opening detection device is powered by the energy acquisition device, and the battery management system is powered by the energy acquisition device.

[0072] In other embodiments not shown in the figure, the power conversion device may also be only electrically connected to the opening detection device. The power conversion device is adapted to be electrically connected to an external power supply, and the power conversion device is configured to convert the electrical energy of the power supply into electrical energy suitable for use by the opening detection device, so that the opening detection device can obtain the opening information of the battery pack under the power supply of the power conversion device.

[0073] At this time, both the power conversion device and the energy acquisition device can supply power to the opening detection device to ensure the continuous operation of the opening detection device in different environments (with or without an external power supply 30). In addition to signal transmission, the opening detection device and the battery management system also need to be electrically connected, so that the electrical energy received by the opening detection device can be transmitted to the battery management system to realize the power supply to the battery management system.

[0074] The working principle of the battery pack opening detection system 20 provided by the embodiment of the present invention is as follows:

[0075] When the battery pack 10 is installed on a vehicle or externally connected to a power supply 30, the power conversion device 6 powers the battery management system 3 and the open cover detection device 2 through the vehicle power supply or the externally connected power supply 30. At this time, all modules of the entire battery pack 10 work normally. When the identity verification of the battery management system 3 and the open cover detection device 2 fails or the battery pack 10 is detected to be opened, the battery management system 3 can immediately judge, disconnect the contactor 4, and deactivate the battery pack 10.

[0076] When the battery pack 10 is removed from the vehicle and there is no externally connected power supply 30, the power conversion device 6 does not work. The energy acquisition device 1 obtains micro energy from the outside and powers the open cover detection module 21 and the first security module 22. If the battery pack 10 is detected to be opened, the first security module 22 records the battery pack 10 open cover event in the non-volatile memory. Only after the battery management system 3 and the open cover device are powered on and working, the battery management system 3 and the open cover detection device 2 perform information interaction to confirm whether there is an unauthorized open cover event, and the battery management system 3 judges whether it is necessary to restrict or degrade the function usage of the battery pack 10.

[0077] In the embodiment of the present invention, the open cover protection process of the battery pack 10 is as follows:

[0078] (1) In the production and manufacturing stage, a secret key is filled into the open cover detection device 2 and the battery management system 3. At the same time, the identity information in the first security module 22 is sent to the battery management system 3 through the open cover detection device 2, and the battery management system 3 stores it in its own second security module 31 through hash operation according to the identity information of the open cover detection device 2 to form a hash code (i.e., the preset identity information).

[0079] (2) In the operation stage, the open cover detection module 21 detects that the battery pack 10 is opened, and sends the battery pack 10 open cover information to the first security module 21. After receiving the open cover information sent by the open cover detection module 21, the first security module 21 stores it. After the battery management system 3 works, it performs certificate verification on the first security module 21.

[0080] The certificate verification steps are as follows:

[0081] Step 1: The second security module 31 of the battery management system 3 sends the currently generated random number to the first security module 22.

[0082] Step 2: The first security module 22 receives the random number, combines the random number with the identity information to form derived information, and then encrypts the derived information with the secret key to generate security information.

[0083] Step 3: The first security module 22 sends security information to the battery management system 3. The second security module 31 of the battery management system 3 decrypts it using a secret key. After decryption, it calculates a hash value based on the received identity information, and compares this hash value with the hash value stored in the production stage (i.e., the preset identity information). If the two hash values are the same, and the random number obtained after decryption is the same as the random number generated by the second security module 31 in Step 1, then the certificate verification passes; otherwise, the certificate verification fails.

[0084] (3) If the certificate verification between the battery management system 3 and the opening detection device 2 passes, the battery management system 3 reads the opening information. If the battery pack 10 is opened, the contactor 4 is controlled to disconnect (i.e., not close), and the battery pack 10 is deactivated; if the battery pack 10 is not opened, the contactor 4 is allowed to close, and the battery pack 10 is activated.

[0085] (4) If the certificate verification between the battery management system 3 and the opening detection device 2 fails, the contactor 4 is controlled to disconnect (i.e., not close), and the battery pack 10 is deactivated.

[0086] In the embodiment of the present invention, the method for the management device 5 to update the verification code (i.e., the preset identity information) in the battery management system 3 is as follows:

[0087] After replacing the opening detection device 2 or the battery management system 3, it will cause the certificate verification between the battery management system 3 and the opening detection device 2 to fail. It is necessary to use the management device 5 to update the verification code in the battery management system 3 according to the production and manufacturing stage through the authorization permission after passing the security access permission of the battery management system 3, so that the certificate verification between the battery management system 3 and the opening detection device 2 can pass.

[0088] In the embodiment of the present invention, the method for the management device 5 to clear the opening information in the opening detection device 2 is as follows:

[0089] After the battery pack 10 has been repaired for opening, the management device 5 can clear the opening information in the opening detection device 2, so that the battery management system 3 allows the contactor 4 to close and activates the battery pack 10. It should be noted that the clearing of the opening information is that the management device 5 clears the opening information through the authorization permission after passing the security access permission of the battery management system 3.

[0090] The electrical equipment provided in the embodiment of the present invention includes the battery pack opening detection system 20 provided in the above embodiment or the battery pack structure provided in the above embodiment.

[0091] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery pack cover opening detection system, characterized in that: include: A cover opening detection device, used to obtain the cover opening information of the battery pack; An energy acquisition device, the energy acquisition device is used to convert the acquired external energy into electrical energy to power the cover opening detection device; The external energy is a combination of one or more of electromagnetic energy, light energy and mechanical energy; The battery pack cover opening detection system further includes a battery management system, the cover opening detection device is communicatively connected to the battery management system, and the battery management system is used to receive the battery pack cover opening information acquired by the cover opening detection device; A certificate verification module is provided between the cover opening detection device and the battery management system; The cover opening detection device includes a cover opening detection module and a first safety module, the cover opening detection module is communicatively connected with the first safety module, and the cover opening detection module is used to obtain the cover opening information of the battery pack; The battery management system is provided with a second safety module; The first security module is communicatively connected with the second security module to form the certificate verification module.

2. The battery pack cover opening detection system according to claim 1, characterized in that: The first security module is used to receive the cover opening information of the battery pack acquired by the cover opening detection module, and encrypt and store the cover opening information of the battery pack; The battery management system is used to receive the cover opening information of the battery pack encrypted and stored by the first security module.

3. The battery pack cover opening detection system according to claim 1, characterized in that: The battery pack cover opening detection system further includes a contactor, the battery management system is in communication connection with the contactor, and the battery management system is further used to control the closing or opening of the contactor according to the received battery pack cover opening information; When the contactor is closed, the battery pack is in an enabled state; when the contactor is open, the battery pack is in a disabled state.

4. The battery pack cover opening detection system according to claim 3, characterized in that: The contactor is disconnected when the battery pack cover is opened, and the contactor is closed when the battery pack cover is not opened.

5. The battery pack cover opening detection system according to claim 3, characterized in that: The battery pack cover opening detection system further includes a management device, and the management device is used to clear the battery pack cover opening information obtained by the cover opening detection device.

6. The battery pack cover opening detection system according to claim 5, characterized in that: A security access module is provided between the cover opening detection device, the battery management system and the management device.

7. The battery pack cover opening detection system according to claim 1, characterized in that: The battery pack cover opening detection system further includes a power conversion device, wherein the power conversion device is electrically connected to the cover opening detection device; The power conversion device is suitable for being electrically connected to a power supply, and is used for converting the electric energy of the power supply into electric energy suitable for use by the cover opening detection device.

8. The battery pack cover opening detection system according to claim 1, characterized in that: The battery pack cover opening detection system further includes a power conversion device, which is electrically connected to the battery management system; The power conversion device is suitable for being electrically connected to a power supply, and is used for converting the electric energy of the power supply into electric energy suitable for use by the battery management system.

9. The battery pack cover opening detection system according to claim 1, characterized in that: The battery pack cover opening detection system further includes a power conversion device, which is electrically connected to the cover opening detection device and the battery management system; The power conversion device is suitable for being electrically connected to a power supply, and is used for converting the electric energy of the power supply into electric energy suitable for use by the cover opening detection device and the battery management system.

10. A battery pack structure, characterized in that: It comprises a battery pack and a battery pack cover opening detection system as described in any one of claims 1 to 9.

11. An electrical device, characterized in that: It includes the battery pack cover opening detection system as described in any one of claims 1 to 9 or the battery pack structure as described in claim 10.

Images