A battery pack service switch provided with an absorption circuit

Abstract

The application discloses a battery pack maintenance switch provided with an absorption circuit and belongs to the technical field of electric vehicles, which comprises a base and a cover body which are detachably connected, a first conductive seat and a second conductive seat are arranged in the base, a first conductive body and a second conductive body which can be connected with the first conductive seat and the second conductive seat respectively are arranged in the cover body, an absorption circuit is arranged between the first conductive seat and the second conductive seat, the absorption circuit comprises an electronic switch and a PTC thermistor which are connected in series, when the cover body is removed, the first conductive seat and the second conductive seat are disconnected, the internal circuit of the vehicle is not conducted, and the vehicle can be maintained, when the cover body is closed, a great pulse current is generated due to instantaneous conduction of the circuit, the PTC thermistor in the absorption circuit can make the increase of the current be delayed, the current is slowly increased, and the risk that the pulse current causes damage to the battery pack can be reduced.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle technology, and specifically relates to a battery pack maintenance switch with an absorption circuit. Background Technology

[0002] Currently, most electric vehicles on the market use lithium batteries as their power unit. An electric vehicle typically requires multiple battery packs. The greater the vehicle's load capacity, the more battery packs are needed. Since the battery packs have very high voltages, maintenance switches are required on the battery packs to cut off power in case of emergencies, facilitating maintenance and repair work.

[0003] A maintenance switch typically consists of two parts: a base and a cover. The base is connected to the battery pack, and the cover is detachably attached to the base. Both the base and the cover have a pluggable electrical connection mechanism. When the cover is inserted, the electrical connection mechanism is activated, and the electric vehicle is powered on and can operate normally. When the cover is pulled out, the electrical connection mechanism is deactivated, and the electric vehicle is powered off, allowing for maintenance and upkeep.

[0004] However, when the cover is inserted, the electrical connection mechanism is instantly turned on, and the electric vehicle is instantly powered on, which generates a transient pulse. This transient pulse will cause a huge current surge to the battery pack, resulting in damage to the battery pack. A maintenance switch with current absorption function is designed to absorb the transient current surge and reduce the damage to the battery pack during the maintenance process. Summary of the Invention

[0005] The purpose of this invention is to provide a battery pack maintenance switch with an absorption circuit to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this invention discloses a battery pack maintenance switch with an absorption circuit, comprising a base and a cover, wherein the base and the cover are detachably connected. A first conductive seat and a second conductive seat are provided within the base, and the first and second conductive seats are electrically connected to the positive and negative terminals of the battery pack, respectively. A first conductor and a second conductor are provided within the cover, and the first and second conductors are electrically connected. A receiving space is provided on the first conductive seat for inserting the first conductor, and a receiving space is provided on the second conductive seat for inserting the second conductor. When the base and the cover are connected, the first conductor is inserted into the receiving space on the first conductive seat to form an electrical connection, and simultaneously, the second conductor is inserted into the receiving space on the second conductive seat to form an electrical connection. An absorption circuit is provided within the base between the first and second conductive seats, and the absorption circuit includes an electronic switch and a PTC thermistor connected in series.

[0007] Furthermore, a common resistor is connected in series within the absorption circuit.

[0008] Furthermore, the cover body is provided with a fuse, and the first conductor and the second conductor are electrically connected to the two ends of the fuse, respectively.

[0009] Furthermore, the electronic switch is a MOSFET.

[0010] Furthermore, the first conductor and the second conductor have the same structure, both being sheet-like structures.

[0011] Furthermore, the first conductive base and the second conductive base have the same structure, and the first conductive base is provided with a first elastic clamping piece and a second elastic clamping piece; when the base and the cover are not connected, the first elastic clamping piece and the second elastic clamping piece are clamped together; when the base and the cover are connected, the first conductor is inserted between the first elastic clamping piece and the second elastic clamping piece to form an electrical connection.

[0012] Furthermore, both the first elastic clamping piece and the second elastic clamping piece have a comb-like structure.

[0013] Furthermore, the comb-shaped gaps of the first elastic clamping piece and the comb-shaped gaps of the second elastic clamping piece are distributed alternately.

[0014] Furthermore, both the first and second elastic clamping plates are made of beryllium bronze.

[0015] Furthermore, both the first conductive base and the second conductive base are provided with conductive studs, and the first conductive base and the second conductive base are respectively connected to the positive and negative terminals of the battery pack through conductive studs.

[0016] Compared with the prior art, the battery pack maintenance switch with absorption circuit of the present invention has the following advantages:

[0017] (1) The battery pack maintenance switch of the present invention is equipped with an absorption circuit. When the cover is connected to the base, the absorption circuit can absorb the extremely large pulse current generated at the moment the circuit between the conductor and the conductive seat is turned on, so that the current in the circuit increases slowly and the risk of the pulse current damaging the battery pack is reduced.

[0018] (2) In the battery pack maintenance switch with absorption circuit of the present invention, an elastic clamping piece is provided in the conductive base to stably clamp the conductor set in the cover body by means of elasticity; at the same time, the two elastic clamping pieces are comb-shaped structures with staggered gaps, so there are multiple points of connection between the conductor and the elastic clamping piece, and the electrical connection has good stability and high reliability.

[0019] (3) The battery pack maintenance switch with absorption circuit of the present invention has a simple structure and is easy to process and implement. Attached Figure Description

[0020] Figure 1 Example 1: A schematic diagram of the overall structure of the battery pack maintenance switch with an absorption circuit.

[0021] Figure 2 Example 1: A schematic diagram of the assembly structure of the battery pack maintenance switch with an absorption circuit.

[0022] Figure 3 : Schematic diagram of the assembly structure of the first conductive base, conductive stud, first elastic clamping plate and second elastic clamping plate.

[0023] Figure 4 : Schematic diagram of the structure of the first elastic clamping piece and the second elastic clamping piece.

[0024] Figure 5 Circuit diagram of the absorption circuit.

[0025] Explanation of reference numerals in the attached drawings: 1. Base; 2. Cover; 3. First conductive base; 4. Second conductive base; 5. Conductive stud; 6. First elastic clamping piece; 7. Second elastic clamping piece; 8. MOSFET; 9. PTC thermistor; 10. Ordinary resistor; 11. Fuse; 12. First conductor; 13. Second conductor. Detailed Implementation

[0026] The technical solution of the present invention will be described in detail below through specific embodiments.

[0027] Example 1

[0028] like Figure 1-5 As shown, a schematic diagram of the overall and partial structure of a battery pack maintenance switch with an absorption circuit is presented.

[0029] A battery pack maintenance switch with an absorption circuit includes a base 1 and a cover 2. The base 1 is fixed on the battery pack. There are corresponding mounting holes between the base 1 and the cover 2. Bolts pass through the mounting holes to detachably connect the base 1 and the cover 2.

[0030] A first conductive seat 3 and a second conductive seat 4 are fixedly installed inside the base 1, and the first conductive seat 3 and the second conductive seat 4 are electrically connected to the positive and negative terminals of the battery pack, respectively.

[0031] The first conductive base 3 and the second conductive base 4 have the same structure. The first conductive base 3 is an L-shaped bent structure. A conductive stud 5 is provided at the bottom of the L-shaped bent structure. A first elastic clamping piece 6 and a second elastic clamping piece 7 are provided on both sides of the side wall of the L-shaped bent structure.

[0032] The first conductive base 3 and the second conductive base 4 are respectively connected to the positive and negative terminals of the battery pack via conductive studs 5.

[0033] An absorption circuit is provided inside the base 1 between the first conductive base 3 and the second conductive base 4. The absorption circuit includes a MOS transistor 8, a PTC thermistor 9, and a general resistor 10 connected in series. The absorption circuit can be integrated onto a circuit board and installed inside the base 1. The specific structure is not limited, and the structure of the absorption circuit is not shown in Embodiment 1.

[0034] A fuse 11 is provided inside the cover 2. A first conductor 12 and a second conductor 13 are connected to the two ends of the fuse 11 respectively. The first conductor 12 and the second conductor 13 have the same structure, both being sheet-like structures.

[0035] When the base 1 and the cover 2 are not connected, the first elastic clamping piece 6 and the second elastic clamping piece 7 are clamped together for the first conductive base 3 and the first conductive body 12. When the base 1 and the cover 2 are connected, the first conductive body 12 is inserted between the first elastic clamping piece 6 and the second elastic clamping piece 7 to form an electrical connection.

[0036] The first elastic clamping piece 6 and the second elastic clamping piece 7 are made of beryllium bronze, which has high elasticity and good conductivity. When the first conductor 12 is inserted between the first elastic clamping piece 6 and the second elastic clamping piece 7, it can effectively clamp the first conductor 12 and form a stable electrical connection.

[0037] The first elastic clamping piece 6 and the second elastic clamping piece 7 have a comb-like structure, and the gaps in the comb-like structure of the first elastic clamping piece 6 and the second elastic clamping piece 7 are staggered. With this arrangement, the first elastic clamping piece 6 and the second elastic clamping piece 7 form multi-point electrical connections with the first conductor 12. Even if some comb teeth do not form an effective connection with the first conductor 12, other comb teeth still form an effective connection with the first conductor 12. Therefore, the electrical connection between the first elastic clamping piece 6 and the second elastic clamping piece 7 and the first conductor 12 has good stability and high reliability. Furthermore, the gaps in the comb-like structure of the first elastic clamping piece 6 and the comb-like structure of the second elastic clamping piece 7 allow the first conductor 12 to form electrical connections with different points on the first elastic clamping piece 6 and the second elastic clamping piece 7, further enhancing the stability and reliability of the electrical connection.

[0038] In normal use, the battery pack maintenance switch of the present invention, equipped with an absorption circuit, connects the base 1 and the cover 2. The first conductive seat 3 and the second conductive seat 4 are electrically connected sequentially through the first conductor 12 and the second conductor 13, and the positive and negative terminals of the battery pack are connected, making the battery pack conductive. When maintenance is required, the cover 2 is removed from the base 1, and the first conductor 12 inside the cover 2 is pulled out from between the first elastic clamping piece 6 and the second elastic clamping piece 7 provided on the first conductive seat 3, disconnecting the first conductor 12 from the first conductive seat 3. Similarly, the second conductor 13 is also disconnected from the second conductive seat 4. Therefore, the first conductive seat 3 and the second conductive seat 4 are disconnected, the positive and negative terminals of the battery pack are not connected, and the battery pack is in an open state. At this time, the circuit inside the electric vehicle is not conductive, and normal maintenance or repair of the electric vehicle can be performed.

[0039] After the repair is completed, the cover 2 needs to be reinstalled on the base 1. During the installation process, the first conductor 12 contacts the first conductive seat 3, and the second conductor 13 contacts the second conductive seat 4. The first conductive seat 3 and the second conductive seat 4 are electrically connected through the first conductor 12, the fuse 11, and the second conductor 13. A voltage drop occurs across the two ends of the absorption circuit, the MOSFET 8 closes, and current is generated in the absorption circuit. At the moment the first conductive seat 3 and the second conductive seat 4 are connected, the current increases instantaneously, and the resistance value of the PTC thermistor 9 increases stepwise. When the current value increases to a certain value, the resistance value of the PTC thermistor 9 reaches its limit, the absorption circuit is disconnected, and the current flows between the first conductive seat 3, the first conductor 12, the fuse 11, the second conductor 13, and the second conductive seat 4, and the battery pack is in a conductive state. It takes a certain amount of time, typically 10-30ms, for the resistance of the PTC thermistor 9 to increase to its maximum value. During this time, the current between the first conductive base 3 and the second conductive base 4 increases slowly, preventing a large current surge to the battery pack and thus protecting it from damage. The absorption circuit effectively absorbs the instantaneous pulse current when the first conductive base 3 and the second conductive base 4 are switched on, thereby reducing the risk of damage to the battery pack from the pulse current.

[0040] Meanwhile, the fuse 11 installed inside the cover 2 serves as an overload protection mechanism. When the current through the fuse 11 abnormally rises to a certain value, the fuse 11 will heat up and melt, thereby cutting off the current and ensuring the safe and normal operation of the battery pack.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery pack maintenance switch equipped with an absorption circuit, characterized in that: The device includes a base and a cover, which are detachably connected. The base contains a first conductive seat and a second conductive seat, which are electrically connected to the positive and negative terminals of the battery pack, respectively. The cover contains a first conductor and a second conductor, which are electrically connected. The first conductive seat has a accommodating space for inserting the first conductor, and the second conductive seat has a accommodating space for inserting the second conductor. When the base and cover are connected, the first conductor is inserted into the accommodating space on the first conductive seat to form an electrical connection, and simultaneously, the second conductor is inserted into the accommodating space on the second conductive seat to form an electrical connection. An absorption circuit is provided between the first and second conductive seats within the base. This absorption circuit includes an electronic switch and a PTC thermistor connected in series. The cover contains a fuse, and the first and second conductors are electrically connected to the two ends of the fuse. The electronic switch is a MOSFET. During the installation of the cover onto the base, an electrical connection is formed between the first conductive base and the second conductive base through the first conductor, the fuse, and the second conductor. A voltage drop occurs across the two ends of the absorption circuit, the MOSFET closes, and current is generated in the absorption circuit. The resistance value of the PTC thermistor increases stepwise. When the current value increases to a certain value, the resistance value of the PTC thermistor reaches its limit, the absorption circuit is disconnected, and current flows between the first conductive base, the first conductor, the fuse, the second conductor, and the second conductive base, and the battery pack is in a conductive state.

2. The battery pack maintenance switch with an absorption circuit as described in claim 1, characterized in that: An ordinary resistor is also connected in series within the absorption circuit.

3. The battery pack maintenance switch with an absorption circuit as described in claim 1, characterized in that: The first conductor and the second conductor have the same structure, both being sheet-like structures.

4. The battery pack maintenance switch with an absorption circuit as described in claim 1, characterized in that: The first conductive base and the second conductive base have the same structure. The first conductive base is provided with a first elastic clamping piece and a second elastic clamping piece. When the base and the cover are not connected, the first elastic clamping piece and the second elastic clamping piece are clamped together. When the base and the cover are connected, the first conductor is inserted between the first elastic clamping piece and the second elastic clamping piece to form an electrical connection.

5. The battery pack maintenance switch with an absorption circuit as described in claim 4, characterized in that: Both the first and second elastic clamping plates have a comb-like structure.

6. The battery pack maintenance switch with an absorption circuit as described in claim 5, characterized in that: The comb-shaped gaps of the first elastic clamping piece and the comb-shaped gaps of the second elastic clamping piece are distributed alternately.

7. The battery pack maintenance switch with an absorption circuit as described in claim 4, characterized in that: Both the first and second elastic clamping plates are made of beryllium bronze.

8. The battery pack maintenance switch with an absorption circuit as described in claim 1, characterized in that: Both the first conductive base and the second conductive base are provided with conductive studs, and the first conductive base and the second conductive base are respectively connected to the positive and negative terminals of the battery pack through the conductive studs.

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