CN110600641A - 48V system lithium ion battery module - Google Patents

Abstract

The invention discloses a 48V system lithium-ion battery module. The front end of the housing is tilted inwardly and upwardly, and the rear end of the front cover is tilted upward; the front cover is provided with mounting holes for positive and negative terminals, mounting holes for signal interfaces, and explosion-proof valves. The installation hole and the water inlet and outlet installation holes; the water cooling plate is a U-shaped water jacket, the lower end of the front end protrudes from the water inlet and outlet, the front end of the battery module protrudes from the positive and negative terminals, and there is a signal interface installation port, which is installed with a BMS; Wrap and fix the water-cooled plate on the three sides of the battery module, place the battery module and the water-cooled plate in the housing, and then fix the front and rear end covers on the front and rear ends of the housing; the signal interface is installed on the signal interface On the installation port; the explosion-proof valve is installed on the installation hole of the explosion-proof valve; the positive and negative terminals and the water inlet and outlet respectively pass through the installation holes of the positive and negative terminals and the installation holes of the water inlet and outlet and are sealed and fixed. The invention has the advantages of uniform heat dissipation, good heat dissipation, good sealing performance and easy assembly.

Description

A 48V system lithium-ion battery module

technical field

The invention relates to a storage battery module, in particular to a 48V system lithium ion battery module.

Background technique

In recent years, 48V has become a hot word in my country's automobile industry. Compared with the traditional 12V electrical system, the 48V electrical system can not only effectively improve the power of the motor, but also efficiently recover the braking energy of the car in the automotive field where hybrid power systems, start-stop devices, and various electronic devices and technologies are coming. More and more electronic loads are required in automobiles to provide more power while improving fuel efficiency by 10% to 15%. However, the technical problem that follows is that, due to the large discharge current and the charging current that needs to be accepted at the moment of vehicle start-up and energy recovery of the 48V battery pack, it will generally reach 500A within 3 seconds. Such high-power charging and discharging, It is bound to cause the battery temperature to rise sharply. The ideal operating temperature range of lithium-ion batteries is 20°C--45°C. During the above-mentioned high-power charging and discharging, the battery pack can easily exceed the upper temperature limit. Moreover, due to the dense arrangement of car battery packs, they are often placed inside the car, which makes the battery heat more serious. In order to ensure the reasonable use and life of the battery, while considering driving safety, it is very necessary to adopt a reasonable cooling design to ensure that the battery pack works within a reasonable temperature range. In addition, if it is operated in an environment where heat dissipation is not allowed, such as adiabatic or high temperature, the temperature of the battery pack will increase significantly or the temperature difference between the cells will be significant, and thermal runaway may even occur due to excessive temperature, which will affect the battery pack. The cycle life and safety of use, so the lithium-ion power battery pack must be designed for heat dissipation.

At present, most 48V electrical systems use natural cooling or air cooling to dissipate heat from the battery, but these two methods have low efficiency, uneven heat dissipation, and are difficult to prevent dust and water, and it is difficult to ensure the cooling effect in hot summer.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems in the prior art, and provide a 48V system lithium-ion battery module with uniform heat dissipation, good heat dissipation, good sealing, and easy assembly.

In order to achieve the above object, the technical solution of the present invention is: a 48V system lithium-ion battery module, which includes a cell module, a box body, a BMS, a water cooling plate and a signal interface;

The box body includes a shell and front and rear end covers; the front end of the shell is tilted up and inward; the rear end of the front cover is extended and inclined to match the front end of the shell; the front cover has mounting holes for positive and negative terminals , signal interface installation holes, explosion-proof valve installation holes and water inlet and outlet installation holes;

The water-cooled plate is a U-shaped water jacket, and the lower end of the front end protrudes from the water inlet and outlet. When in use, the water inlet and outlet are connected to the cooling liquid source;

The front end of the battery module protrudes from the positive and negative terminals, leaving a signal interface installation port, and a BMS is installed; the water-cooled plate is wrapped and fixed on the rear, left and right sides of the battery module, and the battery module and water-cooled The board is placed in the housing, and the front and rear end covers are fixed on the front and rear ends of the housing; the signal interface is installed on the signal interface installation port through the signal interface installation hole on the front cover; the explosion-proof valve is installed on the explosion-proof valve installation hole ; The positive and negative terminals and the water inlet and outlet pass through the installation holes of the positive and negative terminals and the installation holes of the water inlet and outlet respectively and are sealed and fixed.

Further preferably, the material of the housing and the rear end cover is heat-treated aluminum on the surface, ribs are provided on the upper, left and right end faces of the housing to increase the strength and enhance the heat dissipation function; the material of the front end cover is PA66 , to facilitate the installation of the positive and negative terminals, and play an insulating role.

Further preferably, the front end of the housing is inclined upwards and inwards at 70°, and the front end cover is extended upwards and inclined at 70°.

Further preferably, the water cooling plate is made of aluminum plate, which is light in material and high in thermal conductivity.

Further preferably, the battery module includes 12 single lithium battery cells, 6 pieces of aluminum plates, 7 pieces of foam, front and rear adapter plates made of plastic insulating materials, copper bars, splints and positive and negative terminals The shape of the splint matches the battery core, with multiple square holes evenly opened in the middle, and strap grooves are opened at both ends of the length direction, and the two sides of the rear end of the two ends protrude from the positioning baffle, and the front end protrudes from steps. The four corners of the end wall are respectively provided with adapter plate fixing holes, and the middle positions of both sides in the width direction are symmetrically provided with vertically bent clamping plates to form a water-cooled plate clamp groove; the two sides of the aluminum plate in the width direction are vertically bent upwards. ; Both ends of the cell length direction are pre-bent lugs; there are 12 front lug connection holes on the front adapter plate, and front insulation protrusions protrude between the two front lug connection holes that are not connected to each other. Set the front copper bar between the two interconnected front lug connection holes, set the negative copper bar and the positive copper bar at the upper end and the lower end respectively, set BMS fixing columns and front adapter plate fixing holes at the four corners; There are 12 rear tab connection holes on the adapter plate, and a rear insulating boss protrudes between the two rear tab connection holes that are not connected to each other. Rear copper row groove, four corners are provided with rear adapter plate fixing holes; the clamping plate of the lower splint is upward, and foam, battery core, aluminum plate, battery core, foam cotton, battery core, aluminum plate, battery core, foam are installed on it in sequence Cotton..., battery core, aluminum plate, battery core, foam and the upper splint, the clamping plate of the upper splint is downward, and the straps are fixed through the strap grooves on the upper and lower splints. The connecting plate clamps and fixes the upper and lower splints, each foam, each battery cell and each aluminum plate front and back, and the tabs of each cell pass through the connecting holes of the front and rear tabs respectively, and pass through the copper bar and the positive and negative electrodes after bending and correction The copper bars are welded and fixed to ensure that the cells are electrically connected in series. Each copper bar is located in the front and rear copper bar slots and the positive and negative copper bar slots; after the positive and negative copper bars are connected to the BMS, the positive and negative electrodes are fixed through the copper bar connection The terminal and BMS are installed and fixed on the front adapter plate; heat-conducting glue is coated between the battery cell and the aluminum plate, and the rear, left and right sides of each aluminum plate are in contact with the water-cooled plate. In this structure, the aluminum plate is placed in the middle of the battery cell, and cooperates with the water-cooled plate to take away the heat generated by the battery cell; the foam is pasted between each battery cell to reserve the expansion space of the battery cell to play the role of insulation and buffering; , The rear adapter board and the copper bar are installed at the tabs of the battery cells, which are used for series and parallel connection between the battery cells. The structure is simple and the insulation effect between the battery cells is good.

The present invention adds a water-cooling system in the housing, and two water-cooling plates are close to the left and right inner walls of the upper and lower housings, and the lithium-ion battery core is installed in the two water-cooling plates, and the heat generated by the battery core is conducted through the aluminum plate To the surface of the water-cooled plate, the water-cooled plate then passes through the circulation of the coolant to cool and dissipate heat; the lithium-ion battery core is close to the two water-cooled plates, and the heat emitted by it is quickly transmitted out, with uniform and good heat dissipation, and It overcomes the disadvantage of poor heat dissipation between battery cells in the existing battery pack, can ensure that the battery always works within the working temperature range, and prolongs the service life of the battery pack; and the invention has small volume, good sealing performance and easy assembly. Foam has the function of shock absorption and buffering. Adding foam between the cells increases the shock resistance and shock resistance of the lithium-ion battery.

In a word, the present invention realizes the requirement of all-round and balanced heat dissipation of the lithium-ion battery module, improves the safety and reliability of the battery module during use, realizes the heat balance management of the water cooling process, is simple, practical, reliable, and has a long service life. extend.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of the cell module in the present invention;

Fig. 3 is the structural representation of housing among the present invention;

Fig. 4 is the structural representation of front end cover among the present invention;

Fig. 5 is the structural representation of splint in the present invention;

Fig. 6 is a structural schematic diagram of the rear adapter plate in the present invention;

Fig. 7 is a schematic structural view of the front adapter plate in the present invention;

Fig. 8 is the structural representation of water-cooled plate among the present invention;

Fig. 9 is a schematic structural view of foam in the present invention;

Fig. 10 is a schematic structural view of an electric core in the present invention;

Fig. 11 is the structural representation of aluminum plate in the present invention;

Fig. 12 is a schematic structural view of the rear end cover in the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in FIGS. 1-12 , this embodiment includes a cell module, a box body, a BMS 11 , a water cooling plate 5 and a signal interface 6 . The box body includes a shell 2 and front and rear end covers 1,3. The front end of the housing 2 is inclined inwardly upward, preferably, the upwardly inwardly inclined angle is 70°; The front faces match exactly. Front end cover 1 is provided with positive and negative terminal mounting holes 101 and 102 , signal interface mounting hole 103 , explosion-proof valve mounting hole 104 and inlet and outlet mounting holes 105 and 106 . The water cooling plate 5 is a U-shaped water jacket, and the lower end of its front end protrudes into and out of water 501 and 502 . The positive and negative terminals 13 and 14 protrude from the front end of the cell module, and there is a signal interface installation port, where the BMS 11 is installed. Wrap and clamp the water-cooled plate 5 on the rear, left and right sides of the cell module, place the cell module and the water-cooled plate 5 in the housing 2, and fix the front and rear end covers 1 and 3 respectively through the front end cover The hole 107 , the rear end cover fixing hole 301 and the housing fixing hole 201 are fixed on the front and rear ends of the housing 2 . The signal interface 6 is installed on the signal interface installation port through the signal interface installation hole 103 on the front cover 1 . The explosion-proof valve 4 is installed on the explosion-proof valve mounting hole 104 . The positive and negative pole terminals 13, 14 and the water inlet and outlet ports 501 and 502 pass through the positive and negative pole terminal mounting holes 101 and 102 and the water inlet and water outlet mounting holes 105 and 106 respectively, and are sealed and fixed by sealing rings. Preferably, ribs 202 are provided on the upper, left and right end surfaces of the housing 2 . Preferably, the front end of the housing 2 is inclined upwards and inwards at 70°, and the front end cover is extended upwards and inclined at 70°. It is convenient for device installation and fixing. The water cooling plate 5 is made of aluminum plate.

Preferably, the cell module includes 12 single lithium battery cells 16, 6 aluminum plates 15, 7 foams 17, front and rear adapter plates 7, 8 made of plastic insulating materials, and copper bars 12 , splint 9 and positive and negative terminals 13 and 14. The shape of the splint 9 matches the battery core 16, and there are a plurality of square holes uniformly opened in the middle, and the two ends of the length direction are opened with strap grooves 902. On the steps, there are adapter plate fixing holes 901 on the four corners of the two end walls, and vertically bent clamping plates 903 are symmetrically arranged in the middle of both sides in the width direction to form a water-cooled plate clamping groove. Both sides in the width direction of the aluminum plate 15 are bent vertically upwards to the side plates 151 . Both ends of the battery core 16 in the length direction are pre-bent tabs 161 . There are 12 front tab connection holes 707 on the front adapter plate 7, and a front insulating boss 706 protrudes between the two front tab connection holes 707 that are not connected to each other. Between the connecting holes 707, a front copper bar 703 is set, the upper end and the lower end are respectively provided with a negative electrode copper bar 701 and a positive electrode copper bar 702, and four corners are provided with BMS fixing posts 704 and front adapter plate fixing holes 705. There are 12 rear tab connection holes 804 on the rear adapter plate 8, and a rear insulating boss 802 protrudes between the two rear tab connection holes 804 that are not connected to each other. Rear copper row grooves 801 are provided between the connection holes 804, and rear adapter plate fixing holes 803 are provided at the four corners. The clamping plate of the splint 9 below is upward, and the foam 17, the electric core 16, the aluminum plate 15, the electric core 16, the foam 17, the electric core 16, the aluminum plate 15, the electric core 16, the foam 17..., The electric core 16, the aluminum plate 15, the electric core 16, the foam 17 and the upper splint 9, the clamping plate of the upper splint 9 is downward, and the strap 10 is bound and fixed through the strap groove 902 on the upper and lower splint 9, Use the front and rear adapter plates 7 and 8 to clamp and fix the upper and lower splints 9, each foam 17, each battery cell 16 and each aluminum plate 15 front and back, and each battery cell lug passes through each front and rear lug respectively. The holes 707 and 804 are fixed by welding the copper bars and the positive and negative copper bars after bending and correction, so as to ensure that each battery cell 16 is electrically connected in series. and within 701. After the positive and negative copper bars are connected to the BMS 11, the positive and negative terminals 13 and 14 are connected and fixed through the copper bar 12, and the BMS 11 is installed and fixed on the front adapter plate 7. Heat-conducting glue is coated between the electric core 16 and the aluminum plate 15 , and the rear, left and right sides of each aluminum plate 15 are in contact with the water-cooled plate 5 .

The above-mentioned embodiments are only preferred and exemplary, and those skilled in the art can make equivalent technical improvements according to the description of this patent, which are all within the protection scope of this patent.

Claims (9)

1. A48V system lithium ion battery module comprises a battery cell module, a box body, a BMS, a water cooling plate and a signal interface; the method is characterized in that:

the box body comprises a shell, a front end cover and a rear end cover; the front end surface of the shell is upwards, inwards and obliquely inclined; the rear end face of the front end cover extends upwards and inclines outwards and is just matched with the front end face of the shell; the front end cover is provided with a positive terminal mounting hole, a negative terminal mounting hole, a signal interface mounting hole, an explosion-proof valve mounting hole and a water inlet and outlet mounting hole;

the water cooling plate is a U-shaped water jacket, the lower end of the front end of the water cooling plate extends out of the water inlet and the water outlet, and the water inlet and the water outlet are connected with a cooling liquid source when the water cooling plate is used;

the front end of the battery cell module extends out of the positive terminal and the negative terminal, a signal interface mounting port is reserved, and a BMS is mounted; wrapping and clamping the water cooling plate and fixing the water cooling plate on the rear, left and right surfaces of the battery cell module, placing the battery cell module and the water cooling plate in the shell, and fixing the front end cover and the rear end cover on the front end and the rear end of the shell; the signal interface is arranged on the signal interface mounting port through a signal interface mounting hole on the front end cover; the explosion-proof valve is arranged on the explosion-proof valve mounting hole; the positive and negative terminals, the water inlet and the water outlet respectively penetrate through the positive and negative terminal mounting holes and the water inlet and water outlet mounting holes and are sealed and fixed.

2. The 48V system lithium ion battery module of claim 1, wherein: the battery cell module comprises 12 single lithium battery cells, 6 aluminum plates, 7 pieces of foam cotton, a front adapter plate, a rear adapter plate, a copper bar, a clamping plate, a positive terminal and a negative terminal, wherein the front adapter plate and the rear adapter plate are made of plastic insulating materials; the shape of the clamping plate is matched with that of the electric core, a plurality of square holes are uniformly formed in the middle of the clamping plate, strap grooves are formed in two end parts in the length direction, positioning baffles are protruded from two sides of the rear ends of the two ends, steps are protruded from the front ends of the two ends, adapter plate fixing holes are formed in four corners of two end walls, and clamping plates which are bent vertically are symmetrically arranged in the middle positions of two sides in the width direction to form water-cooling plate clamp grooves; two sides of the aluminum plate in the width direction are vertically bent upwards; the two ends of the battery cell in the length direction are provided with pre-bent lugs; the front rotary joint plate is provided with 12 front lug connecting holes, a front insulation boss is protruded between two front lug connecting holes which are not connected with each other, a front copper bar groove is arranged between the two front lug connecting holes which are connected with each other, the upper end and the lower end of the front rotary joint plate are respectively provided with a negative copper bar groove and a positive copper bar groove, and four corners of the front rotary joint plate are provided with BMS fixing columns and front rotary joint plate fixing holes; the rear adapter plate is provided with 12 rear lug connecting holes, a rear insulating boss protrudes between two rear lug connecting holes which are not connected with each other, a rear copper bar groove is arranged between the two rear lug connecting holes which are connected with each other, and rear adapter plate fixing holes are arranged at four corners of the rear adapter plate; the clamping plate of the lower clamping plate is upward, the foam cotton, the cell, the aluminum plate, the cell, the foam cotton … …, the cell, the aluminum plate, the cell, the foam cotton and the upper clamping plate are sequentially arranged on the clamping plate, the clamping plate of the upper clamping plate is downward, a binding band is used for binding and fixing through a binding band groove on the upper clamping plate and a binding band groove on the lower clamping plate, the upper clamping plate, the lower clamping plate, the foam cotton, the cell and the aluminum plate are clamped and fixed by a front adapter plate and a rear adapter plate, lugs of the cell respectively penetrate through a front lug connecting hole and a rear lug connecting hole, and after bending and correction, the lugs of the cell are welded and fixed through a copper bar and a positive copper bar and; after the positive and negative copper bars are connected with the BMS, the positive and negative terminals are fixedly connected through the copper bars, and the BMS is fixedly installed on the front rotary connecting plate; heat-conducting glue is coated between the battery cell and the aluminum plates, and the back, the left and the right of each aluminum plate are in contact with the water cooling plate.

3. The 48V system lithium ion battery module of claim 1 or 2, wherein: the shell and the rear end cover are made of aluminum materials with heat treatment on the surfaces, and ribs are arranged on the upper end surface, the left end surface and the right end surface of the shell; the front end cover material is PA 66.

4. The 48V system lithium ion battery module of claim 3, wherein: the front end face of the shell is upwardly and inwardly inclined by 70 degrees, and the front end cover is upwardly and outwardly inclined by 70 degrees.

5. The 48V system lithium ion battery module of claim 4, wherein: the water cooling plate is made of an aluminum plate.

6. The 48V system lithium ion battery module of claim 1 or 2, wherein: the front end face of the shell is upwardly and inwardly inclined by 70 degrees, and the front end cover is upwardly and outwardly inclined by 70 degrees.

7. The 48V system lithium ion battery module of claim 6, wherein: the water cooling plate is made of an aluminum plate.

8. The 48V system lithium ion battery module of claim 3, wherein: the water cooling plate is made of an aluminum plate.

9. The 48V system lithium ion battery module of claim 1 or 2, wherein: the water cooling plate is made of an aluminum plate.