A lithium ion battery safety early warning system and method

Abstract

The application discloses a lithium ion battery safety early warning system and method, which comprises a pressure flip piece arranged in the battery, wherein the pressure flip piece has a contact part protruding towards the positive pole column of the battery; when the pressure in the battery reaches a certain threshold, the pressure flip piece is deformed under the action of the pressure to drive the contact part to contact the positive pole column of the battery and trigger the voltage change between the battery cover plate and the positive pole column of the battery; the early warning system further comprises a voltage signal receiver used for receiving the voltage signal between the battery cover plate and the positive pole column of the battery; after receiving the pressure signal, the voltage signal receiver sends an early warning signal to the terminal. The voltage change between the battery cover plate and the positive pole column of the early warning system and method does not affect the normal discharging and charging process of the battery, thus, does not affect the normal use of the energy storage system of the whole vehicle, gains time for maintenance and replacement, and avoids the occurrence of safety accidents.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a lithium ion battery safety warning system and method. BACKGROUND

[0002] With the vigorous promotion of electric vehicles and new power systems, the safety of lithium ion batteries is increasingly valued. The safety of lithium ion batteries includes intrinsic safety, passive safety and active safety.

[0003] Intrinsic safety refers to improving the thermal stability of positive and negative electrode materials and electrolyte to prevent the battery body from thermal runaway. For example, the technology disclosed in patent WO202 / 026621A1 improves the thermal stability of lithium-rich manganese-based materials by doping anions and cations and coating fast ion conductors.

[0004] Passive safety includes battery heat insulation, heat dissipation, safety protection design and fire-fighting measures after thermal runaway. For example, the technology disclosed in patent CN221861861U sets temperature, smoke, gas sensors and fire-fighting devices in a single sub-battery compartment. Secondly, for example, the technology disclosed in patents CN18431693A and CN204760445U designs a pneumatic deformable member on the end cover to prevent battery overcharging.

[0005] Active safety is to ensure the use of batteries below the thermal runaway safety boundary through battery thermal management, state evaluation, safety warning and other technologies. For example, the technology disclosed in patents CN118330495A and CN118457351A uses threshold setting, cluster analysis and other methods to analyze the safety state of the battery pack in real time through the temperature, heat generation and EIS impedance of the battery pack, and actively alarms when the battery abnormally occurs.

[0006] However, passive safety technology in the prior art often causes permanent damage to the battery, which cannot be used continuously. In addition, passive safety technology and active safety technology are not closely combined to form an effective linkage. In CN204760445U, when the battery expands, the bendable and deformable circuit breaker deforms and triggers the cover device, causing the positive and negative electrodes to short circuit and the fuse to melt, so that the battery cannot continue to charge and discharge.

[0007] Therefore, based on the above technical problems, the present application needs to develop a lithium ion battery safety warning system and method. SUMMARY

[0008] The application aims to provide a lithium ion battery safety warning system and method, which combines active and passive safety together, triggers voltage signal change through battery internal pressure, sends a warning signal, reminds users to repair and replace the battery in time, and prevents safety accidents.

[0009] In order to achieve the above-mentioned purpose, the application provides the following technical scheme.

[0010] The application provides a lithium ion battery safety warning system, which comprises:

[0011] A pressure flip piece arranged in the battery, wherein the pressure flip piece has a contact part protruding towards the positive pole column of the battery;

[0012] When the internal pressure of the battery reaches a certain threshold, the pressure flip piece is deformed under the action of the pressure to drive the contact part to contact the positive pole column of the battery, and trigger the voltage change between the battery cover plate and the positive pole column of the battery;

[0013] The warning system further comprises:

[0014] A voltage signal receiver for receiving the voltage signal between the battery cover plate and the positive pole column of the battery;

[0015] The voltage signal receiver sends a warning signal to the terminal after receiving the voltage signal.

[0016] Further, the battery comprises:

[0017] The battery cover plate and the positive pole column of the battery;

[0018] The positive pole column of the battery comprises a positive pole riveting column and a positive pole terminal;

[0019] The pressure flip piece is arranged in the battery, and the edge of the pressure flip piece is connected with the battery cover plate;

[0020] When the internal pressure of the battery reaches a certain threshold, the pressure flip piece is deformed under the action of the pressure to drive the contact part to contact the positive pole terminal of the battery.

[0021] Further, an upper insulating piece is arranged between the battery cover plate and the positive pole terminal;

[0022] A lower insulating piece is arranged at the lower part of the battery cover plate, and the edge of the pressure flip piece is fixed between the battery cover plate and the lower insulating piece.

[0023] Further, in the normal state of the pressure flip piece, the positive pole terminal and the battery cover plate are in an insulating state through the upper insulating piece, and the resistance between the battery cover plate and the positive pole terminal is not less than 1MΩ.

[0024] After the pressure flip piece is flipped, the positive pole terminal and the battery cover plate are electrically contacted through the contact part of the pressure flip piece, and the resistance value between the battery cover plate and the positive pole terminal is not greater than 100Ω.

[0025] Further, the battery cover plate and the negative pole of the battery are in an insulating state, and the resistance value between the battery cover plate and the negative pole of the battery is not less than 1MΩ.

[0026] Further, the pressure flip piece comprises an integral intermediate part and an extension part formed in the circumferential direction of the intermediate part.

[0027] The thickness of the extension part is less than the thickness of the intermediate part.

[0028] The end part of the extension part contacts the battery cover plate, and the area close to the intermediate part of the extension part is a pressure deformation area.

[0029] The intermediate part is protrudedly formed as the contact part towards the side of the positive pole terminal.

[0030] Further, the pressure threshold value of the pressure flip piece is less than the opening valve pressure of the battery safety valve.

[0031] Further, the pressure threshold value of the pressure flip piece is less than 0.1MPa-0.2MPa.

[0032] The application further discloses a lithium ion battery safety warning method based on the warning system.

[0033] The safety warning method mainly comprises the following steps:

[0034] S101, when the internal pressure of the battery reaches a certain threshold value, the pressure flip piece on the battery cover plate is triggered to flip and deform;

[0035] S102, the pressure flip piece contacts the positive pole of the battery, and the voltage between the battery cover plate and the positive pole is changed;

[0036] S103, after the voltage signal receiver receives the voltage signal, a warning signal is sent out;

[0037] S104, the warning signal is sent to the terminal to send the safety failure warning information to the user.

[0038] Further, the warning signal is an audible and light warning signal.

[0039] In the above technical solution, the lithium ion battery safety warning system and method provided by the application has the following beneficial effects:

[0040] The safety warning system and method provided by the application adopt a pressure flip sheet capable of deforming by the change of the internal pressure of the battery between the battery cover plate and the positive pole, when the internal pressure of the battery changes to a certain threshold, the pressure flip sheet deforms and flips to drive the contact part to contact the positive pole terminal, so as to discover the fault in time and send the safety fault warning information to the user.

[0041] The voltage change between the battery cover plate and the positive pole of the warning system and method of the application does not affect the normal discharging and charging process of the battery, thus does not affect the normal use of the energy storage system of the whole vehicle, gains time for maintenance and replacement, and avoids the occurrence of safety accidents.

[0042] The system structure of the application does not need to change the existing assembly process, and only needs to combine the warning method of the application to realize the safety warning of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the present application, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0044] Figure 1 A block diagram of a lithium ion battery safety warning method disclosed by the embodiments of the present application;

[0045] Figure 2 A structural schematic diagram of a battery cover plate of a lithium ion battery safety warning system disclosed by the embodiments of the present application;

[0046] Figure 3 A structural schematic diagram of a battery cover plate and a positive pole before the flip of a pressure flip sheet of a lithium ion battery safety warning system disclosed by the embodiments of the present application;

[0047] Figure 4 A structural schematic diagram of a battery cover plate and a positive pole after the flip of a pressure flip sheet of a lithium ion battery safety warning system disclosed by the embodiments of the present application;

[0048] Figure 5 A voltage monitoring schematic diagram between a battery cover plate and a positive pole in a parallel battery pack of a lithium ion battery safety warning system disclosed by the embodiments of the present application;

[0049] Figure 6 A voltage monitoring schematic diagram between a battery cover plate and a positive pole in a series battery pack of a lithium ion battery safety warning system disclosed by the embodiments of the present application.

[0050] Explanation of reference signs:

[0051] 201, positive post; 202, battery safety valve; 203, battery cover plate; 204, negative post;

[0052] 20101, positive post terminal; 20102, positive riveting post;

[0053] 301, upper insulating piece; 302, lower insulating piece;

[0054] 4, pressure flip piece;

[0055] 401, contact part; 402, extension part; 403, pressure deformation area;

[0056] 501, total positive; 502, total negative; 503, voltage signal receiver. DETAILED DESCRIPTION

[0057] In order to make the technical personnel in the art better understand the technical solutions of the present application, the present application will be further described in detail below in conjunction with the drawings.

[0058] Referring to Figures 2 to 6 as shown;

[0059] The embodiment discloses a lithium ion battery safety early warning system, which comprises:

[0060] The pressure flip piece 4 is arranged in the battery, and the pressure flip piece 4 has a contact part 401 protruding towards the side of the positive post of the battery;

[0061] When the pressure in the battery reaches a certain threshold, the pressure flip piece 4 is deformed under the action of the pressure to drive the contact part 401 to contact the positive post 201 of the battery, and trigger the change of the voltage between the battery cover plate 203 and the positive post 201 of the battery;

[0062] The early warning system further comprises:

[0063] A voltage signal receiver 503 is arranged to receive the voltage signal between the battery cover plate 203 and the positive post 201 of the battery;

[0064] After the voltage signal receiver 503 receives the voltage signal, the early warning signal is sent to the terminal.

[0065] Specifically, the embodiment discloses a lithium ion battery safety warning system, which mainly comprises a pressure flip piece 4 arranged on one side of a positive pole 201 of the battery, and the pressure flip piece 4 is deformed and flipped by the change of the internal pressure of the battery, so that the system realizes the electrical contact between the battery cover plate 203 and the positive pole 201 of the battery by the pressure flip piece 4. When the internal pressure of the battery changes to a certain threshold value, the pressure flip piece 4 is deformed under the action of the pressure to drive the contact part 401 to contact the positive pole 201 of the battery, and the voltage between the battery cover plate 203 and the positive pole 201 of the battery is changed, then the voltage signal is received by the voltage signal receiver 503, and the warning signal is sent to the terminal.

[0066] Firstly, the structure of the battery is further introduced, especially the structure of one end of the positive pole 201 of the battery, specifically: the battery of the embodiment comprises a positive pole 201 and a battery cover plate 203;

[0067] The positive pole 201 comprises a positive riveting pole 20102 and a positive pole terminal 20101; according to the conventional connection mode, the connection between the battery cover plate 203, the positive pole 201 and the voltage detection device can adopt tin soldering or mechanical fastening and the like. The pressure flip piece 4 of the embodiment is arranged in the battery, and the edge of the pressure flip piece 4 is connected with the battery cover plate 203.

[0068] When the internal pressure of the battery reaches a certain threshold value, the pressure flip piece 4 is deformed under the action of the pressure to drive the contact part 401 to contact the positive pole terminal 20101 of the battery.

[0069] Preferably, the battery cover plate 203 and the positive pole terminal 20101 of the embodiment are provided with an upper insulating piece 301;

[0070] The lower part of the battery cover plate 203 is provided with a lower insulating piece 302, and the edge of the pressure flip piece 4 is fixed between the battery cover plate 203 and the lower insulating piece 302.

[0071] The positive pole terminal 20101 and the battery cover plate 203 are in an insulating state through the upper insulating piece 301 under the normal state of the pressure flip piece 4 of the embodiment, and the resistance between the battery cover plate 203 and the positive pole terminal 20101 is not less than 1MΩ;

[0072] After the pressure flip piece 4 is flipped, the positive pole terminal 20101 and the battery cover plate 203 are electrically contacted through the contact part 401 of the pressure flip piece 4, and the resistance between the battery cover plate 203 and the positive pole terminal 20101 is not more than 100Ω.

[0073] Secondly, the pressure flip sheet 4 of the present embodiment is arranged on the positive pole 201 side of the battery, and no pressure flip sheet 4 is arranged on the negative pole 204 side, so that the battery cover plate 203 of the present embodiment is in an insulating state with the negative pole 204 of the battery, and the resistance between the battery cover plate 203 and the negative pole 204 of the battery is not less than 1MΩ.

[0074] Based on the above principle, the pressure flip sheet 4 of the present embodiment includes an integral intermediate part and an extension part 402 formed circumferentially on the intermediate part.

[0075] The thickness of the extension part 402 is less than the thickness of the intermediate part.

[0076] The end of the extension part 402 contacts the battery cover plate 203, and the area of the extension part 402 close to the intermediate part is a pressure deformation area 403.

[0077] The intermediate part is protruded to form a contact part 401 towards the positive pole terminal 20101 side.

[0078] Preferably, the pressure threshold of the pressure flip sheet 4 of the present embodiment is less than the opening pressure of the battery safety valve.

[0079] Specifically, the pressure threshold of the pressure flip sheet 4 is less than 0.1MPa-0.2MPa.

[0080] The present application also discloses a lithium ion battery safety warning method, which is based on the warning system as described above.

[0081] Referring to Figure 1 The safety warning method mainly includes the following steps:

[0082] S101, when the internal pressure of the battery reaches a certain threshold, the pressure flip sheet 4 on the battery cover plate 203 is triggered to flip and deform;

[0083] S102, the pressure flip sheet 4 contacts the positive pole 201 of the battery, triggering a change in voltage between the battery cover plate 203 and the positive pole 201;

[0084] S103, after the voltage signal receiver 503 receives the voltage signal, an early warning signal is sent out;

[0085] S104, the early warning signal is sent to the terminal to send safety failure warning information to the user.

[0086] Among them, the early warning signal of the present embodiment is an audible and light early warning signal.

[0087] Embodiment one:

[0088] Referring to Figure 5As shown, for ternary lithium-ion batteries, the opening pressure of the battery safety valve 202 is 0.9±0.1MPa, and the flipping pressure of the pressure flipper 4 is 0.7±0.1MPa. The battery pack connection method is described in [reference needed]. Figure 5 For parallel connection, when the internal pressure of a battery reaches 0.7 MPa, the pressure flipper 4 activates, from... Figure 3 Change to Figure 4 The voltage detection device detects changes in the voltage signal, and the control system then sends a warning signal to the terminal, prompting the terminal user to replace or repair the battery in a timely manner.

[0089] Example 2:

[0090] See Figure 6 As shown, for lithium iron phosphate lithium-ion batteries, the opening pressure of battery safety valve 202 is 0.8±0.1MPa, and the flipping pressure of pressure flip plate 4 is 0.6±0.1MPa. The battery pack connection method is described in [reference needed]. Figure 6 For series connection, when the internal pressure of a battery reaches 0.6MPa, the pressure flipper 4 is activated, and the pressure flipper 4 is activated. Figure 3 Become Figure 4 When the voltage detection device detects a change in the voltage signal, the control system sends a warning signal to the terminal, prompting the terminal user to replace or repair the battery in a timely manner.

[0091] Similarly, for sodium-ion batteries, using the parameters in Example 2, after the pressure flipping plate 4 is activated, by Figure 3 Change to Figure 4 The voltage detection device detects a change in the voltage signal, and the control system then sends a warning signal to the terminal, prompting the terminal user to replace or repair the battery in a timely manner.

[0092] In this embodiment, the warning signal can be an audible and visual warning signal. At the same time, the signal can be remotely sent to the monitoring platform, which can activate the system's self-protection function, cut off the power supply, and prevent battery damage or thermal runaway risks.

[0093] The batteries and battery packs involved in this embodiment can be used in electric vehicles and energy storage systems to provide reliable safety warnings for electric vehicles and energy storage systems, improve the safety and stability of electric vehicles and energy storage systems, and prevent safety accidents from occurring.

[0094] The lithium-ion battery safety early warning system and method provided by the present invention, as described above, have the following beneficial effects:

[0095] The safety warning system and method provided by the application adopts a pressure flip sheet 4 capable of deforming by the change of the internal pressure of the battery between the battery cover plate 203 and the positive pole 201, when the internal pressure of the battery reaches a certain threshold, the pressure flip sheet 4 deforms and flips to drive the contact part 401 to contact the positive pole terminal 20101, so as to discover the fault in time and send the safety fault warning information to the user.

[0096] The voltage change between the battery cover plate 203 and the positive pole 201 of the warning system and method of the application does not affect the normal discharging and charging process of the battery, therefore, does not affect the normal use of the energy storage system of the whole vehicle, gains time for maintenance and replacement, and also avoids the occurrence of safety accidents.

[0097] The system structure of the application does not need to change the existing assembly process, only needs to combine the warning method of the application, and the safety warning of the battery can be realized.

[0098] The above only describes some exemplary embodiments of the application by way of illustration, without doubt, for those skilled in the art, the described embodiments can be modified in various ways without departing from the spirit and scope of the application. Therefore, the above drawings and descriptions are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the application.

Claims

1. A lithium-ion battery safety early warning system, characterized in that, The early warning system comprises: A pressure flip piece (4) arranged inside the battery, the pressure flip piece (4) having a contact part (401) protruding towards the positive pole column (201) of the battery; When the pressure inside the battery reaches a certain threshold, the pressure flip piece (4) deforms under the action of the pressure to drive the contact part (401) to contact the positive pole column (201) of the battery, and trigger a change in voltage between the battery cover plate (203) and the positive pole column (201) of the battery; The early warning system further comprises: A voltage signal receiver (503) for receiving the voltage signal between the battery cover plate (203) and the positive pole column (201) of the battery; The voltage signal receiver (503) sends an early warning signal to the terminal after receiving the voltage signal; The battery comprises: The battery cover plate (203) and the positive pole column (201) of the battery; The positive pole column (201) of the battery comprises a positive pole riveting column (20102) and a positive pole column terminal (20101); The pressure flip piece (4) is arranged inside the battery, and the edge of the pressure flip piece (4) is connected to the battery cover plate (203); When the pressure inside the battery reaches a certain threshold, the pressure flip piece (4) deforms under the action of the pressure to drive the contact part (401) to contact the positive pole column terminal (20101) of the battery; An upper insulating piece (301) is arranged between the battery cover plate (203) and the positive pole column terminal (20101); A lower insulating piece (302) is arranged at the lower part of the battery cover plate (203), and the edge of the pressure flip piece (4) is fixed between the battery cover plate (203) and the lower insulating piece (302); In the normal state of the pressure flip piece (4), the positive pole column terminal (20101) and the battery cover plate (203) are in an insulating state through the upper insulating piece (301); after the pressure flip piece (4) is flipped, the positive pole column terminal (20101) and the battery cover plate (203) are electrically connected through the contact part (401) of the pressure flip piece (4); The battery cover plate (203) and the negative pole column (204) of the battery are in an insulating state.

2. The safety warning system for lithium ion battery according to claim 1, wherein, The resistance between the battery cover plate (203) and the positive pole column terminal (20101) is not less than 1MΩ, and the resistance between the battery cover plate (203) and the positive pole column terminal (20101) is not greater than 100Ω.

3. The safety warning system for lithium-ion battery according to claim 2, wherein, The resistance between the battery cover plate (203) and the negative pole column (204) of the battery is not less than 1MΩ.

4. The safety warning system for lithium-ion battery according to claim 1, wherein, The pressure flip piece (4) comprises an integral intermediate part and an extension part (402) formed in the circumferential direction of the intermediate part; The thickness of the extension part (402) is less than the thickness of the intermediate part; The end part of the extension part (402) contacts the battery cover plate (203), and the area close to the intermediate part of the extension part (402) is a pressure deformation area (403); The intermediate part protrudes towards the side of the positive pole column terminal (20101) to form the contact part (401).

5. The safety warning system for lithium-ion battery according to claim 1, wherein, The pressure threshold of the pressure flip plate (4) is less than the opening pressure of the battery safety valve (202).

6. The safety warning system for lithium-ion battery according to claim 5, wherein, The pressure threshold of the pressure flip plate (4) is less than 0.1-0.2 MPa.

7. A method for safety warning of a lithium ion battery, characterized in that, The safety warning method is based on the warning system as claimed in any one of claims 1 to 6; The safety warning method mainly comprises the following steps: S101, when the internal pressure of the battery reaches a certain threshold, the pressure flip plate (4) on the battery cover plate (203) is triggered to flip and deform; S102, the pressure flip plate (4) contacts the positive pole (201), triggering a change in voltage between the battery cover plate (203) and the positive pole (201); S103, after the voltage signal receiver (503) receives the voltage signal, an early warning signal is sent out; S104, the early warning signal is sent to the terminal to send safety failure warning information to the user.

8. The method of claim 7, wherein the step of determining the state of the lithium-ion battery comprises the steps of: determining a state of charge of the lithium-ion battery; determining a state of health of the lithium-ion battery; and determining a state of power of the lithium-ion battery. The early warning signal is an audible and visual early warning signal.

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