CN210120171U - Low-voltage 12V lithium battery system for passenger vehicle - Google Patents

Abstract

The utility model discloses a low-voltage 12V lithium battery system for a passenger vehicle, which comprises an upper cover assembly, a lower shell and a battery module, wherein the upper cover assembly comprises an upper cover body, the upper cover body and the lower shell are mutually connected to form the battery shell, and the battery module is placed in the battery shell; the upper cover assembly also comprises an LIN interface, a negative pole post and a positive pole post which are connected on the upper cover body and extend out of the battery shell, an SOC display arranged on the upper cover body, and a battery management system, an electric energy distribution unit and a temperature switch which are fixed on the inner surface of the upper cover body. The utility model realizes the high-power charging and discharging performance of the battery system and can increase the service life of the battery; the utility model utilizes the pyrotechnic power-off safety protection switch to replace the traditional fuse, so that the whole system can still break the main loop in the collision extrusion process, and the secondary ignition of the whole vehicle is avoided; the electric energy distribution unit can rapidly realize the switching of charging and discharging, and can more efficiently realize the distribution of electric energy.

Description

A low-voltage 12V lithium battery system for passenger vehicles

technical field

The utility model relates to the field of lithium batteries for electric vehicles and fuel vehicles, in particular to a low-voltage 12V lithium battery system for passenger vehicles.

Background technique

In 1918, the car was first introduced to the battery. With the birth of the starter, the battery was widely used in 1929. At that time, the voltage level of the battery was 6V, and the positive electrode was grounded. Due to the increase of internal combustion engine displacement and the emergence of high compression ratio internal combustion engines, 6V batteries can no longer meet the power demand. In 1950, the voltage level began to evolve to 12V, and 12V lead-acid batteries have dominated for more than 60 years.

The general understanding is that lead-acid batteries are commonly used batteries in electric vehicles, car ignition, solar photovoltaic, UPS power systems and other industries. The disadvantages are heavy weight, short life, and memory effect, but they are cheap; Batteries commonly used in electronic equipment have the advantages of light weight, large capacity, long life and no memory effect. At present, the start-stop 12V power supply used by the cars on the market are all lead-acid batteries, which can no longer meet the requirements of lightweight, high-power start-stop, long life, and high battery life.

Utility model content

The technical problem to be solved by the utility model is to provide a low-voltage 12V lithium battery system for passenger vehicles, which can greatly reduce the quality of the battery pack and increase the cycle life of the battery. The system (BMS) controls the battery status, uses a temperature switch to quickly cut off the circuit, and uses a power distribution unit (BDU) for charge and discharge control.

The technical scheme of the present utility model is:

A low-voltage 12V lithium battery system for passenger vehicles, comprising an upper cover assembly, a lower casing and a battery module, the upper cover assembly includes an upper cover body, the upper cover body and the lower casing They are connected to each other to form a battery case, and the battery module is arranged in the battery case; the upper cover assembly also includes a LIN interface, a negative pole, and a LIN interface connected to the upper cover and extending out of the battery case The positive pole, the SOC display installed on the upper cover, the battery management system, the power distribution unit and the temperature switch fixed on the inner surface of the upper cover; the LIN interface and the SOC display are all connected with the battery management system, and the positive pole The column is connected to the positive pin of the power distribution unit, the negative pin of the power distribution unit is connected to the positive tab of the battery module, and the negative tab of the battery module is connected to one end of the pyrotechnic power-off safety protection switch. The other end of the electrical safety protection switch is connected to the negative pole; the battery module includes a lithium-ion cell, a heat shrinkable film wrapped around the lithium-ion cell, and an integrated cover plate assembly arranged on the top of the lithium-ion cell ; The integrated cover plate assembly includes a plastic tray, an aluminum pole piece, a sampling wire harness, a temperature sensor and a voltage sampling terminal that are fixedly connected to the plastic tray; One end of the wire harness is connected to the lithium ion cell, the other end of the sampling harness is connected to the voltage sampling terminal, and the output end of the voltage sampling terminal and the output end of the temperature sensor are both connected to the battery management system.

The four corners of the upper cover are recessed structures, the negative pole and the positive pole are respectively connected to two corners of the upper cover, and the top of the positive pole is provided with a positive protection A cover, the top end of the negative pole pole is provided with a negative protection cover, and the positive protection cover and the negative protection cover are respectively connected with the upper cover body through a buckle.

A host wiring harness is fixed on the inner surface of the upper cover body, and the LIN interface and the SOC display are connected to the battery management system through the host wiring harness.

A first copper row is fixed on the inner surface of the upper cover, and the positive pole is connected to the positive pin of the electric energy distribution unit through the first copper row.

A second copper row is fixed on the inner surface of the upper cover body, and the negative pin of the electric energy distribution unit is connected to the positive electrode tab of the battery module through the second copper row.

A third copper row is fixed on the inner surface of the upper cover body, and the other end of the temperature switch is connected to the negative pole pole through the third copper row.

The inner surface of the upper cover body is fixed with a plurality of limit slots, the top of the battery module is provided with a plurality of limit pins, and the limit pins and the limit slots are connected to each other by engaging with each other. The upper cover body and the lower casing and the battery module and the lower casing are all bonded and fixed.

A handle is fixed on the outer surface of the upper cover body.

The advantages of the utility model:

The utility model utilizes the chemical characteristics of lithium ions to realize the high-power charging and discharging performance of the battery system, and can increase the service life of the battery; the utility model utilizes a pyrotechnic power-off safety protection switch to replace the traditional fuse, so that the overall system can still be maintained during the collision and extrusion process. It can disconnect the main circuit to avoid secondary fire of the whole vehicle. The power distribution unit (BDU) composed of IGBTs can quickly realize the switching of charging and discharging, and can realize the distribution of electric energy more efficiently; the utility model is bonded and fixed to the upper cover body and the lower case, the battery module and the lower case , the process operation is simple and reliable and the air tightness is guaranteed.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

FIG. 2 is a schematic structural diagram of the upper cover assembly of the present invention.

3 is a schematic structural diagram of a battery module of the present invention.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

1-3, a low-voltage 12V lithium battery system for passenger vehicles includes an upper cover assembly, a lower case 2 and a battery module 3, and the upper cover assembly includes a battery with a handle 17 fixed on the outer surface. The upper cover 1, the upper cover 1 and the lower case 2 are connected to each other to form a battery case. The battery module 3 is arranged in the battery case. The inner surface of the upper cover 1 is fixed with three limit slots 18. The battery module There are three limit pins 19 at the top of the battery. The limit pins 19 are connected with the limit slot 18 by engaging with each other. Adhesive and fixed; the upper cover assembly also includes a LIN interface 4, a negative pole 5 and a positive pole 6 that are connected to the upper cover 1 and protrude out of the battery case, and an SOC display disposed on the upper cover 1 7. The battery management system (BMS) 8, the power distribution unit (BDU) 9, the pyrotechnic power-off safety switch (pyroswitch) 10, the host wiring harness 11, the first copper row 12, The second copper row 13 and the third copper row 14; the four corners of the upper cover body 1 are recessed structures, the negative pole pole 5 and the positive pole pole 6 are respectively connected to two corners of the upper cover body, and the positive pole pole The top of the 6 is provided with a positive protective cover 15, and the top of the negative pole 5 is provided with a negative protective cover 16. The positive protective cover 15 and the negative protective cover 16 are respectively connected with the upper cover 1 by snaps; LIN interface 4, SOC display 7 Both are connected to the battery management system 8 through the host wire harness 11, the positive pole 6 is connected to the positive pin of the power distribution unit 9 through the first copper bar 12, and the negative pin of the power distribution unit 9 is connected to the battery module through the second copper bar 13. The positive electrode tab 37 of the group 3 is connected, the negative electrode tab 38 of the battery module 3 is directly connected to one end of the pyrotechnic power-off safety protection switch 10, and the other end of the pyrotechnic power-off safety protection switch 10 is connected with the third copper bar 14. The negative pole 5 is connected; the battery module 3 includes a lithium-ion cell, a heat shrinkable film 31 wrapped around the lithium-ion cell, and an integrated cover plate assembly disposed on the top of the lithium-ion cell; the integrated cover plate assembly includes There is a plastic tray 32, which is fixedly connected to the aluminum pole piece 33, the sampling wire harness 34, the temperature sensor 35 and the voltage sampling terminal 36 on the plastic tray 32; The other end of the sampling wire harness 34 is connected to the voltage sampling terminal 36 , and the output end of the voltage sampling terminal 36 and the output end of the temperature sensor 35 are both connected to the battery management system 8 .

The above-mentioned pyrotechnic power-off safety protection switch is a pyrotechnic power-off safety protection switch with model PSS-2 of Autoliv Company of Sweden.

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (8)

1. The utility model provides a low pressure 12V lithium battery system for passenger car which characterized in that: the battery comprises an upper cover assembly, a lower shell and a battery module, wherein the upper cover assembly comprises an upper cover body, the upper cover body and the lower shell are connected with each other to form a battery shell, and the battery module is arranged in the battery shell; the upper cover assembly also comprises an LIN interface, a negative pole post, a positive pole post, an SOC display, a battery management system, an electric energy distribution unit and a temperature switch, wherein the LIN interface, the negative pole post and the positive pole post are connected to the upper cover body and extend out of the battery shell; the LIN interface and the SOC display are connected with a battery management system, the positive pole column is connected with a positive pole pin of the electric energy distribution unit, a negative pole pin of the electric energy distribution unit is connected with a positive pole lug of the battery module, a negative pole lug of the battery module is connected with one end of the pyrotechnic power-off safety protection switch, and the other end of the pyrotechnic power-off safety protection switch is connected with the negative pole column; the battery module comprises a lithium ion battery cell, a heat shrinkage film wrapped outside the lithium ion battery cell and an integrated cover plate assembly arranged at the top end of the lithium ion battery cell; the integrated cover plate assembly comprises a plastic tray, an aluminum pole piece fixedly connected to the plastic tray, a sampling wire harness, a temperature sensor and a voltage sampling terminal; the aluminum pole piece is welded with a pole of the lithium ion cell, one end of the sampling wire harness is connected with the lithium ion cell, the other end of the sampling wire harness is connected with the voltage sampling terminal, and the output end of the voltage sampling terminal and the output end of the temperature sensor are both connected with the battery management system.

2. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: four corners of last lid be sunk structure, negative pole post and anodal utmost point post connect respectively in two of them corners of last lid, the top of anodal utmost point post be provided with anodal visor, the top of negative pole post be provided with the negative pole visor, anodal visor, negative pole visor pass through the buckle with last lid respectively and be connected.

3. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: and a host wire harness is fixed on the inner surface of the upper cover body, and the LIN interface and the SOC display are connected with a battery management system through the host wire harness.

4. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: the inner surface of the upper cover body is fixed with a first copper bar, and the anode pole is connected with the anode pin of the electric energy distribution unit through the first copper bar.

5. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: and a second copper bar is fixed on the inner surface of the upper cover body, and a negative electrode pin of the electric energy distribution unit is connected with a positive electrode lug of the battery module through the second copper bar.

6. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: and a third copper bar is fixed on the inner surface of the upper cover body, and the other end of the temperature switch is connected with the cathode pole through the third copper bar.

7. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: the internal surface of last lid fixed with a plurality of spacing draw-in grooves, the top of battery module is provided with a plurality of spacer pins, spacer pin and spacing draw-in groove block each other be connected, last lid and down between the casing, all bond fixedly between battery module and the lower casing.

8. The low-voltage 12V lithium battery system for the passenger vehicle of claim 1, wherein: and a handle is fixed on the outer surface of the upper cover body.

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