CN102683907A

CN102683907A - Clamp system for electrical connection among cell units

Info

Publication number: CN102683907A
Application number: CN2012100574897A
Authority: CN
Inventors: 冯国安
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-01-24
Filing date: 2011-01-24
Publication date: 2012-09-19
Anticipated expiration: 2031-01-24
Also published as: CN102683907B

Abstract

The invention provides a clamp system for electrical connection among cell units. The clamp system for electrical connection among cell units has a novel structure, and a cooling fluid can effectively and efficiently cool power cell packs of electric automobiles in a uniform and well-distributed mode. The system comprises a large clamp, a small clamp and an end clamp, wherein the large clamp is used for crossing a cooling deflecting plate and providing electrical connection between two dual cores, the small clamp is used for providing electrical connection between two battery cells inside a dual core, and the end clamp is connected to an anode of a first dual core and a cathode of a last dual core and is used for being connected to a cable of a main power supply.

Description

Be used for the clip systems that is electrically connected between the battery unit

The application be submitted on January 21st, 2012, international application no is " electrokinetic cell cooling device ", application people dividing an application for the application for a patent for invention of Feng Guoan for " PCT/SG2011/000029 ", one Chinese patent application number for " 201180003001.6 ", denomination of invention.

Background technology

Introduce

Along with petering out of petroleum resources, and the environmental pollution that brings of burns gasoline, electric automobile (EVs) will be the future of traffic.But battery has its important disadvantages: short distance travelled, in short useful life and expensive, these have hindered popularizing of electric automobile.

The temperature of regulating cell is a big challenge in trickle charge and discharge process.

For most electric automobile lithium batteries, its temperature specification is following usually:

Working temperature :-20 ℃ to 60 ℃

Charging temperature: 0 ℃ to 45 ℃

Storage temperature :-10 ℃ to 45 ℃

Battery reaches its rated capacity at 20 ~ 25 ℃, 10 ℃ of the every risings of temperature, and its capacity will descend ~ and 10%.

In the winter time, when temperature was easy to be low to moderate 0 ℃, battery was difficult to or can not charges fully.

In other seasons, in continuous large current charge and discharge process, the working temperature of battery is easy to reach 60 ℃, makes its be difficult to discharge.High temperature also can cause battery performance to worsen, reduction of service life, or cause potential safety hazard.

These proprietary characteristics of lithium battery need the well-adjusted battery temperature management and control system good with design.

Simple for narrating, in paragraph subsequently:

" cooling " just represented heat exchange, also i.e. cooling or heating.

" cooling fluid " has antifreeze, fire-retardant with regard to representative, the liquid of non-corrosiveness and mildewproof bacterium characteristic is used for the battery heat exchange.

The drawback of existing power brick

Current power brick is connected to form by the battery module of some, and each battery module is connected to form by the battery unit of some.The result causes the unit that is positioned at the module centre to have thermal insulation to a greater extent, also just more is difficult for carrying out heat exchange.

The conventional battery cooling scheme is positioned over battery module or be attached on the coldplate (flat metallic plate, in cooling circuit is arranged) usually, and drawback is that cooling effectiveness is low, and cooling effect is poor, and reason is that the sub-fraction of each battery module receives cooling effect.In addition since in cooling circuit is arranged, coldplate is not only thick usually but also heavy.The result is each battery module, and the temperature of each battery unit is all inequality.Even in same battery unit, the temperature of different parts is also inequality.If, will cause unpractical overweight and excessive with each battery unit of coldplate cooling.

The consistency of each battery unit and uniformity are most important to the life-span and the usefulness of power brick in the power brick.In case power brick is produced and be assemblied in to battery unit, uniquely can influence its consistency and inhomogeneity factor is exactly the temperature of each battery unit.The change of temperature can influence the internal resistance of battery unit, and the change of internal resistance influences the speed of variations in temperature again conversely.Temperature contrast between the battery unit will cause the aging speed of different electric pool unit, and the result is the lost of life of some battery units.Owing to power brick is to be joined together to work together by battery unit to operate, the inefficacy of single battery unit will cause the damage of entire cell bag.

The batteries of electric automobile bag also receives the restriction of space and weight, and the cooling system of power brick must compactness and light weight, satisfies the demand of power and energy simultaneously.

Summary of the invention

A compactness, the high power macro-energy power brick solution of light weight and long life

Based on above observation, I design a unique power brick cooling device that is suitable for electric automobile.Although this design is to the utilization of electric automobile and is the Proof of Concept design to real electric automobile that this does not limit to and influence its novel concept, the patent protection in other is used of principle and structure.

According to one embodiment of present invention, a kind of clip systems that is electrically connected that is used between the battery unit is provided, has comprised: big clip, said big clip are used to cross over the cooling baffler provides being electrically connected between two twin-cores; Small clamp, said Small clamp are used to be provided at being electrically connected between inner two battery of single twin-core; And the end clip, said end clip is connected to the positive pole of first twin-core and the negative pole of last twin-core, is used to be connected to the main power source cable.

Description of drawings

Following figure says a part that constitutes explanation,

Fig. 1 be a big specification lamination type battery (100Ah, 3.7V);

Fig. 2 is a double cell core series connection (abbreviation twin-core);

Fig. 3 is a Small clamp;

Fig. 4 is a big clip;

Fig. 5 is a termination clip;

Fig. 6 is a cooling duct plate;

Fig. 7 is a cooling duct end plate;

Fig. 8 is a cooling grid;

Fig. 9 is a preceding rubber slab;

Figure 10 is a front shroud;

Figure 11 is a rubber slab before the protecgulum strip;

Figure 12 is a rubber slab after;

Figure 13 is a back shroud;

Figure 14 is a rubber slab after the bonnet strip;

Figure 15 is a base plate;

Figure 16 is a side plate;

Figure 17 is an empty battery case;

Figure 18 is a battery case that is full of twin-core;

Figure 19 is that the C of Figure 18 looks in detail;

Figure 20 is that the D of Figure 18 looks in detail;

Figure 21 is a top cover;

Figure 22 is a Battery case;

Figure 23 flows to sketch map;

Figure 24 is a rubber slab front view before the cooling grid band;

Figure 25 is that the A&C of Figure 24 looks in detail;

Figure 26 is a rubber slab rearview behind the cooling grid band;

Figure 27 is that the A of Figure 26 looks in detail;

Figure 28 is a rubber slab open space top view before and after the cooling grid band;

Figure 29 is that the B forward sight of Figure 28 is detailed, and the signal cooling fluid is in the flow direction at preceding rubber slab open space place;

Figure 30 is that the C backsight of Figure 28 is detailed, the flow direction at signal cooling fluid rubber slab open space place in the back;

Figure 31 is that the D&E of Figure 28 looks in detail, and the signal cooling fluid is in the flow direction at place, bottom cooling duct.

Embodiment

About the kind and the specification of battery, I select the lamination type battery.Compare with the cylindrical battery core, the lamination type battery has lower internal resistance, thereby in the charging and discharging process, produces less heat.And it has higher energy/power density.Because its flat profile and bigger exposed surface make it more be prone to carry out heat exchange.

I have 86 big specification lamination type battery (100Ah, 3.7V is like Fig. 1) by the battery case of design.Battery couples together through the clip of novelty, under the situation of limited space, provides to be electrically connected, and is described below.

Two battery are be connected in series face-to-face (Fig. 2), through the different electrodes continuous (Fig. 3) of Small clamp with two battery.This will form a double cell core series connection (abbreviation twin-core).The two sides of twin-core contacts with cooling duct plate (Figure 18) carries out heat exchange.

Twin-core with identical towards placement, through big clip (Fig. 4) stride across the cooling duct plate be connected in series (Figure 18 in detail-D).

Termination clip (Fig. 5) is used in the positive pole (Figure 20) of first battery of first twin-core, and the negative pole of last battery of last twin-core, is used to connect leader cable.All clips are processed by the metal of conduction.

This will reach voltage (320V) and energy (32kWh), so that pure motor driving 120 ~ 150km (the daily distance travelled of 90% city dweller).

Be to reduce the cost of Battery case, adopt aluminum alloy extrusion section bar to be used for the structure plate of casing as far as possible.

Fig. 6 describes the cooling duct plate, and the hollow duct of separation is used for that cooling fluid flows through and carry out heat exchange with twin-core.

In the groove of the notch of insertion cooling duct, the two ends end plate of cooling duct plate (Fig. 7), end face is concordant.Constitute a leak free connection with friction stir welding (FSW), form the structure-cooling grid of a homogeneity and rule, describe like Fig. 8, a plurality of cooling ducts plate connects with the cooling duct end plate with a row.The cooling duct plate also works to support location and typing to battery.

Preceding rubber slab (Fig. 9) places the recess (Figure 10) of front shroud.Final form is as seeing from the there that rubber slab is arranged, like Figure 11.

Back rubber slab (Figure 12) places the recess (Figure 13) of back shroud.Final form is as seeing from the there that rubber slab is arranged, like Figure 14.

The opening pattern of front and back rubber slab is slightly different.Before rubber slab about narrow opening (about narrow opening different layouts is arranged) is arranged, all the other are wide opening, the narrow opening correspondence is two runners (1x2 or 2x2 layout) laterally, wide opening correspondence is four runners (1x4 layout) (Figure 24 and Figure 25) laterally.Narrow opening has two kinds of forms, big narrow opening by name and little narrow opening (Fig25/31).Corresponding four runners (2x2 layout) of big narrow opening, corresponding two runners (1x2 layout) of little narrow opening.Back rubber slab all is wide opening (Figure 26 and Figure 27).This opening layout will play and change the effect (Figure 28 to Figure 31) that flows to.Rubber slab also plays a part to seal between the runner.

The structure of this device innovation is; A cooling grid is arranged; The preceding rubber slab of a peculiar opening pattern of a protecgulum strip; And the back rubber slab of a peculiar opening pattern of a bonnet strip, make cooling fluid be able in a passage, evenly cool off effectively whole device, keep whole device compactness and light weight simultaneously again.

Friction stir welding (FSW), or other method of attachment that is fit to can be used for following connection:

-front shroud and preceding cooling duct end plate (must leak free the connection)

-back shroud and back cooling duct end plate (must leak free the connection)

-base plate (Figure 15) and cooling duct, front and back end plate

-two side plates (Figure 16) and cooling duct, front and back end plate and base plate.

The structure of final empty Battery case such as Figure 17.

Twin-core is inserted (Figure 18) after the space between the plate of cooling duct, just can lay essential heat insulating lamella or piece, connect big clip of Small clamp and termination clip (as previously mentioned), connect battery management system (BMS) and cable laying.

On the top cover (Figure 21) elongated slot of laying BMS is arranged.It also is equipped with different sockets, as is used for the 12VDC socket of BMS, a main power socket and two Can-bus2.0 terminations.It also is equipped with the rapid release joint and imports and exports in cooling fluid.All these make it in the running of electric automobile, accomplish plug and play easily.

Between top cover and the battery case top rubber gasket sheet (Figure 18) is arranged and connected by securing member, entire cell case (Figure 22) will be other seal of IP65 level, be fit to electric automobile and use.

Figure 23 shows the flow schematic diagram of cooling fluid in battery case cooling grid.For for simplicity, single round tubular structure is represented two runners.The position of runner is described in Figure 24 to Figure 27.Rubber slab before and after the front and rear cover plate band in the connection, cooling fluid will change the flow direction in rubber slab opening part space.How preceding rubber slab changes the flow direction is described in Figure 29, and how back rubber slab changes the flow direction is described in Figure 30.Figure 31 is presented at the flow direction of bottom runner.

Conclusion

This device makes that cooling fluid is evenly effective and cools off each battery unit (core), the fail safe that has prolonged the life-span of battery and improved battery efficiently with a kind of design of innovation.

The total weight of power brick (Figure 22) is ~ 350kg (comprise ~ 13kg cooling fluid).

Its overall dimensions are L=1031mm, W=509mm, H=445mm.

This power brick is in light weight but firm, voltage 320V, energy 32kWh, energy to weight ratio ~ 91Wh/kg, energy capacity ratio ~ 137Wh/L.Such specifications parameter can satisfy the needs of most electric automobiles.

Following possible application

Present batteries of electric automobile bag by different automobile production producers with different form production.This just causes lacking the expensive of large-scale production, and the power brick of different automobile production producers does not have interchangeability.

If power brick is a standard, it just can be adopted by different automobiles at an easy rate.National grid is more likely produced a kind of power brick of standard than automobile production producer, and this will benefit from many aspects.

Centralized infrastructure is produced, and charging and battery maintenance bag can produce economies of scale, bring the saving of producers and consumers's cost.Power brick can charging transports the gas station then in the power station at the electricity consumption peak valley.Replace to refuel, the consumer only needs to change in the gas station power brick, the power brick of depleted of energy is stayed by electrical network fetch charging.This will prolong the mileage of electric automobile.

Adopt the centralized infrastructure charging and will be full of electric power brick to transport the gas station to, government need not invest a large amount of funds and build charging station in different places, practices thrift a large amount of funds.And the consumer need not worry the durability and the maintenance of power brick, and national grid can be handled these problems.

Thereby this mode can reduce the growth that the price of electric automobile promotes market significantly.Automobile production producer only need design the following automobile that holds the standard cell bag and get final product.

The notion of this power brick cooling device and structure also can be applied to following other occasion, are restricted and need the effectively occasion of cooling like the power brick of compact light weight or space.

Claims

1. clip systems that is electrically connected that is used between the battery unit comprises:

Big clip, said big clip are used to cross over the cooling baffler provides being electrically connected between two twin-cores;

Small clamp, said Small clamp are used to be provided at being electrically connected between inner two battery of single twin-core; And

The end clip, said end clip is connected to the positive pole of first twin-core and the negative pole of last twin-core, is used to be connected to the main power source cable.