A triple-protection lithium iron phosphate battery false charging prevention device

Abstract

The utility model discloses a kind of lithium iron phosphate battery false connection charging devices with triple protection, including male head, female head and charger control module, male head and female head are mutually matched, male head includes male head shell, protrusion, two plugs and communication pin, female head includes female head shell, matching groove is equipped on female head shell, protrusion is embedded into matching groove, communication wiring port is also equipped in female head shell, two jack are also equipped in female head shell;Battery management system is also equipped in female head shell, in the utility model, plug extends male head shell, after determining matching jack in plug, female head and male head can be electrically connected, the reliability of misconnection of cross type / cross standard can be solved;The clamping function between protrusion and matching groove can not only realize reliable connection of female head and male head, but also can be mechanically locked;Battery management system is connected with charger control module by communication pin, and electrical layer intelligent matching can be realized.

Description

Technical Field

[0001] This utility model relates to the technical field of lithium iron phosphate batteries, specifically to a lithium iron phosphate battery anti-misconnection charging device with triple protection. Background Technology

[0002] With the global pursuit of sustainable energy, the new energy battery sector is developing rapidly. Lithium batteries, especially lithium iron phosphate batteries, are gradually replacing traditional lead-acid batteries in various application scenarios due to their advantages such as high energy density, long cycle life, and good safety. Their application scope is constantly expanding, from electric bicycles and energy storage systems to industrial forklifts and other industrial equipment. At the same time, in many application scenarios, especially in logistics warehousing and manufacturing, lead-acid battery forklifts are still widely used, which means that lead-acid battery forklifts and lithium battery forklifts will be used interchangeably for a considerable period of time.

[0003] Throughout the development of battery charging technology, the universality and compatibility of different types of battery charging interfaces have always been a focus of industry attention. This issue is particularly prominent in industrial equipment such as forklifts due to their high usage frequency and complex operating environments. While some universal standards (such as the widespread use of REMA connectors in forklifts) have promoted product adoption to some extent in terms of charging interfaces, plug designs, and communication protocols, existing standards reveal numerous shortcomings when faced with complex and diverse scenarios involving mixed use of batteries and equipment. These standards struggle to meet the demands for safe and efficient charging, necessitating innovative technologies to address these problems.

[0004] In actual customer applications, forklifts using lead-acid batteries and lithium batteries are frequently used interchangeably in logistics warehousing and manufacturing settings. Both use the universal REMA plug, making them highly susceptible to misconnection by users. Lithium batteries and lead-acid batteries differ significantly in voltage characteristics and charging algorithms. If a lithium battery forklift is mistakenly connected to a lead-acid charger, or if the charging port of the lithium battery forklift is incorrectly connected to the discharge port of the lithium battery charger, it will not only prevent the lithium battery from charging properly and affect forklift operating efficiency, but may also damage related electronic components of the lithium battery, potentially even causing safety hazards. This results in economic losses for customers (such as forklift downtime and battery repair costs) and negatively impacts the user experience and market reputation. For forklift battery products exported to Europe, the European market has strict standards for electrical safety and product compatibility in industrial equipment (such as EN 1755 forklift safety standards). This misconnection problem urgently needs to be addressed to meet local market regulations and enhance product competitiveness.

[0005] In summary, a lithium iron phosphate battery anti-misconnection charging device with triple protection was designed. Utility Model Content

[0006] To overcome the above-mentioned shortcomings, this utility model provides a lithium iron phosphate battery anti-misconnection charging device with triple protection.

[0007] This utility model achieves the above objectives through the following technical solutions:

[0008] A lithium iron phosphate battery anti-misconnection charging device with triple protection includes a male connector, a female connector, and a charger control module. The male connector and the female connector are matched with each other. The male connector includes a male connector shell, a protrusion, two plugs, and a communication pin. The protrusion and the communication pin are both disposed in the male connector shell, and the plugs extend out of the male connector shell.

[0009] The female connector includes a female connector housing, on which a matching groove is provided, and a protrusion is embedded into the matching groove. The female connector housing also has a communication connector port, into which a communication pin is embedded. The female connector housing also has two sockets, into which two plugs are respectively inserted.

[0010] The female connector housing also houses a battery management system, which is connected to the charger control module via a communication pin.

[0011] Preferably, the matching groove is provided with a blocking rib. The blocking rib is located on the lower end face of the protrusion, which can effectively limit the protrusion when it is embedded in the matching groove, thereby achieving a reliable connection between the male and female connectors and ensuring that the plug is subsequently embedded in the socket.

[0012] Preferably, the distance between the communication pin and the plug is greater than 3cm, which can meet the safety electrical distance requirement and increase the isolation voltage between the communication pin and the plug to 3kV.

[0013] Preferably, the distance between the two plugs is greater than 8cm, which can satisfy the requirement that the safe electrical isolation voltage between the two plugs is greater than 8kV.

[0014] Preferably, the battery management system and the charger control module communicate via a CAN bus.

[0015] The beneficial effects of this utility model are: This triple-protection lithium iron phosphate battery anti-misconnection charging device includes:

[0016] 1. The plug extends out of the male connector housing, enabling electrical connection between the female and male connectors after the plug is correctly positioned in the matching socket. This dedicated matching design of the physical interface can resolve reliability issues related to cross-type / cross-standard misconnections.

[0017] 2. The locking function between the protrusion and the matching groove not only enables a reliable connection between the female and male connectors, but also allows for mechanical locking;

[0018] 3. The battery management system communicates with the charger control module via communication pins, enabling intelligent matching of the electrical layer and improving the intelligence of the charging device and the reliability of charging. Attached Figure Description

[0019] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the connection structure between the male and female connectors of this utility model;

[0021] Figure 2 This is a schematic diagram of the male connector of this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of the female head of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the computer display screen of this utility model. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0025] like Figures 1-4 As shown, a lithium iron phosphate battery anti-misconnection charging device with triple protection includes a male connector, a female connector and a charger control module. The male connector and the female connector are matched with each other. The male connector includes a male connector shell 1, a protrusion 3, two plugs 2 and a communication pin 4. The protrusion 3 and the communication pin 4 are both disposed in the male connector shell 1, and the plugs 2 extend out of the male connector shell 1.

[0026] The female connector includes a female connector housing 5, on which a matching groove 7 is provided. A protrusion 3 is embedded in the matching groove 7. The female connector housing 5 also has a communication connector port 9, into which a communication pin 4 is embedded. The female connector housing 5 also has two sockets 6, into which two plugs 2 are inserted respectively. When the lithium battery male connector attempts to insert into a non-compatible female connector (such as a lead-acid charger plug 2, which is a REMA male connector or an SB plug 2), the connection cannot be completed because the male connector is not compatible with other types of plugs 2. When only the compatible female connector is inserted, the protrusion 3 and the matching groove 7 are fully fitted, and the plug 2 makes smooth contact to achieve electrical connection. During insertion, the protrusion 3 contacts the plug 2 first. If the female connector is a non-compatible type (mismatched hole shape), the protrusion 3 is blocked and cannot be pushed in, and the interface cannot be locked. Only with the compatible female connector, the protrusion 3 can be fully inserted into the matching groove 7, and the plug 2 then completes the electrical connection.

[0027] The female head housing 5 is also equipped with a battery management system, which is connected to the charger control module via a communication pin 4.

[0028] Specifically, the matching groove 7 is provided with a blocking rib 8, which is located on the lower end face of the protrusion 3. When the protrusion 3 is embedded in the matching groove 7, the blocking rib 8 plays a good limiting role, further realizing a reliable connection between the male and female heads, and ensuring that the plug 2 is subsequently embedded in the socket 6.

[0029] Specifically, the distance between the communication pin 4 and the plug 2 is greater than 3cm, which meets the safety electrical distance requirement and increases the isolation voltage between the communication pin 4 and the plug 2 to 3kV.

[0030] Specifically, the distance between the two plugs 2 is greater than 8cm, which can meet the requirement that the safe electrical isolation voltage between the two plugs 2 is greater than 8kV.

[0031] Specifically, the battery management system and the charger control module communicate via a CAN bus. The battery management system, abbreviated as BMS, has a CAN protocol chip integrated inside the lithium battery BMS. It is connected to the corresponding communication port 9 of the charger female connector via communication pins, and then connected to the charger control module. The definition of the communication pins needs to be consistent between the battery management system and the charger.

[0032] Experimental Principle: A dedicated communication protocol (CAN protocol, the content of which is agreed upon in advance by the BMS and the charger, such as the baud rate, whether the ID uses a standard frame or an extended frame, and how the specific content of the charging message is defined, etc.) is used. After the BMS is powered on, it starts to continuously send messages. After receiving the message, the charger starts to identify whether the message is consistent with the protocol definition. If they are inconsistent, the charger does not respond. If they are consistent, the charger executes the charging process according to the charging instructions sent by the BMS and simultaneously sends broadcast information to report the current working status of the charger. If neither party receives a message from the other within 5 seconds, both parties enter a communication error state, the charger shuts down the output, and reports a communication timeout fault.

[0033] Action Relationship:

[0034] After the physical connection is completed, the protocol chip automatically triggers the communication process. If the charger is not compatible (no corresponding protocol or returns an error signal), the BMS cuts off the main circuit. Only when the verification is successful, the BMS sends a charging permission command. After the charger recognizes that the protocol is consistent, it starts the compatible constant current and constant voltage charging mode.

[0035] Based on the above description and inspired by this utility model, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A lithium iron phosphate battery anti-misconnection charging device with triple protection, comprising a male connector, a female connector, and a charger control module, wherein the male connector and the female connector are mutually compatible, characterized in that: The male connector includes a male connector housing, a protrusion, two plugs, and a communication pin. The protrusion and the communication pin are both disposed in the male connector housing, and the plugs extend out of the male connector housing. The female connector includes a female connector housing, on which a matching groove is provided, and a protrusion is embedded into the matching groove. The female connector housing also has a communication connector port, into which a communication pin is embedded. The female connector housing also has two sockets, into which two plugs are respectively inserted. The female connector housing also houses a battery management system, which is connected to the charger control module via a communication pin.

2. The lithium iron phosphate battery anti-misconnection charging device with triple protection according to claim 1, characterized in that: The matching groove is provided with a blocking rib, which is located on the lower end face of the protrusion.

3. The lithium iron phosphate battery anti-misconnection charging device with triple protection according to claim 1, characterized in that: The distance between the communication pin and the plug is greater than 3cm.

4. The lithium iron phosphate battery anti-misconnection charging device with triple protection according to claim 1, characterized in that: The distance between the two plugs is greater than 8cm.

5. The lithium iron phosphate battery anti-misconnection charging device with triple protection according to claim 1, characterized in that: The battery management system and the charger control module communicate via a CAN bus.

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