CN2781578Y

CN2781578Y - Battery

Info

Publication number: CN2781578Y
Application number: CNU2005200004850U
Authority: CN
Inventors: 姚立和
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-06
Filing date: 2005-02-06
Publication date: 2006-05-17
Anticipated expiration: 2015-02-06

Abstract

The utility model relates to a battery pack which is characterized in that a plurality of branches which are serially connected are parallelly connected among a group of power supply buses, and the branches which are serially connected are formed by serial connection of a plurality of batteries; a plurality of electric conductors are connected between two adjacent branches which are serially connected, and then, a battery on a branch which is serially connected is parallelly connected with a battery on another branch which is serially connected. The netted matrix arrangement combination which is formed by mixed connection of serial connection and parallel connection by the mode has the advantages of the serial connection and the parallel connection, and electric conductors with high current loading capacity do not need to be used; thus, the integral weight and the cost of the battery pack can be reduced, and production and service efficiency can be improved.

Description

Battery pack

Technical field

A kind of battery pack that is applicable to the power source that needs high current charge-discharge (for example motor vehicle) is to mix with connection in series-parallel by a plurality of batteries to connect into the combination of net like arranged, reaches the battery pack that can significantly alleviate overall weight.

Background technology

Utilize electric power to develop for many years already, and its electric supply installation can be by making up a plurality of storage batterys or use single large-sized battery to provide electric power to vehicle, but all there is sizable shortcoming in aforementioned dual mode as the Vehicular system of energy source.With the former is example, if battery pack is to be formed by connecting with a plurality of storage batterys, only single storage battery just has suitable weight, can not ignore especially and occupy volume, the numerous battery pack that storage battery constituted like this, if be applied to the motor vehicle system, volume that it is huge and weight cause great burden on the contrary for vehicle.

If as electric supply installation, its manufacturing technology itself is just more complicated than general battery with the special battery of a high power capacity, yet the fail safe that most important consideration is to use.This type of battery is along with the increasing (it is big that end face diameter becomes) of its volume, and the probability of blasting also improves thereupon, and its danger and injury are not allowed to despise.

For overcoming the shortcoming of aforementioned dual mode, battery pack can connect and compose by a plurality of compact battery set, see also shown in Figure 11, if battery is adopted the connected mode of series connection, at first a plurality of batteries 61 are constituted many serial connection branch 62 earlier to be connected in series, these 62 in branches of serial connection are parallel between the two ends power supplies bus 63,64 again, and the power supply that picks out positive and negative polarity with power supply bus 63,64 is for should load.It is evident that, the connected mode of this form does not allow single any one battery 61 in the serial connection branch 62 to have fault state to take place, in case any one battery 61 fault, then should be connected in series branch's 62 complete interruption of power supply, even if all the other batteries 61 of this serial connection branch 62 are still normal condition and also can't play a role, make capacity and efficient significantly reduce.In addition, all the other are connected in series the former power supply energy that branch 62 will on average share this inefficacy serial connection branch 62 normally, cause the supply load of each single battery 61 to strengthen, and therefore battery 61 and battery pack life-span also shorten.

See also shown in Figure 12ly, if the connection of parallel way is that branch 72 is arranged and connect to a plurality of batteries 71 more at first with electric conductor 73 its positive and negative two ends that are connected in parallel to constitute, each is arranged and connects branch 72 and connects with series system more to each other and form a battery pack.

See also shown in Figure 13, in order to reach framework in parallel shown in Figure 12, for satisfying the requirement of the high magnitude of current of Vehicular battery, must use be connected in parallel each single battery 71 of a whole row of extremely thick electric conductor 73 constitutes and meets branch 72 in the lump, to bear very big electric current, and just in each and the battery 71 that meets branch 72, negative the two poles of the earth all must be connected in parallel by this extremely thick electric conductor 73, the polarity that is indicated according to drawing battery 71, the two adjacent and battery polar arrangement modes that meet branch 72 are just for opposite, and the two adjacent electric conductors 73 that therefore connect both positive and negative polarity also must be connected in series with this extremely thick electric conductor 73 mutually again.

Aforementioned framework in parallel can overcome the shortcoming of series connection framework really, even battery 71 faults still can normally provide electric power to carrying on the back or on the head with all the other batteries 71 that meet branch 72 in the lump, yet this framework but derive other problem.At first, because be to use parallel way to connect, employed electric conductor 73 must bear quite high current capacity, suppose that this battery pack can provide the electric current of N ampere to give load, then each electric conductor 73 just must adopt the thick electric conductor that is not less than N ampere ability to bear, so numerous thick electric conductors will make the weight of integral battery door group significantly increase, the application of unfavorable battery pack.

In addition, these numerous single battery 71 parallel connections are to adopt the spot welding mode to carry out, under so thick electric conductor situation, weld job is difficulty quite, its reliability certainly will descend thereupon, and then the production of this battery pack and service efficiency make people worried really, and this mode is obviously infeasible.

The utility model content

Main purpose of the present utility model provides a kind of battery pack, adopt a plurality of minor diameter secondary cells to mix and connect into net like arranged assembled state with connection in series-parallel, make battery pack guarantee to have the connection advantage of series and parallel, also can reduce the overall weight of battery pack simultaneously.

For reaching aforementioned purpose, this battery pack contains:

One group of power supply bus is connected in parallel to many serial connection branches between this group power supply bus, each is connected in series branch and connects to form with a plurality of battery series connection;

A plurality of electric conductors are to connect two adjacent serial connection branches, make in the serial connection branch formation state in parallel between two adjacent each single battery that are connected in series with another in branch.

Aforementioned a plurality of electric conductor is to utilize a conducting strip to constitute, and each conducting strip can be to extend a plurality of sheet contacts from the both sides of a guide card body, with these a plurality of sheet contacts battery is connected.

Aforementioned battery pack is to place a box body inner and covered with a cover plate, wherein is formed with a plurality of oblique perforates on the sidewall of box body.

Each single battery specification of aforementioned formation battery pack, be meant this single battery central point apart from the beeline of housing outer rim between 0.5cm～3.5cm, and the integral battery door group constitutes with at least 4 * 4 number of battery cells arranged.

Each single battery of aforementioned this battery pack of formation can be chargeable secondary cell, for example lithium ion battery, lithium macromolecule battery, Ni-MH battery or hydrogen oxygen fuel cell.

Aforementioned this group power supply bus is to utilize two conducting strips to constitute, and each conducting strip is to extend a plurality of sheet contacts from a side of a guide card body, with these a plurality of sheet contacts battery is connected.

Mix the framework that connects into the combination of net like arranged by above-mentioned connection in series-parallel, even a battery failures is wherein arranged, all the other batteries still can normal operation, makes battery pack have higher power and reliable and fail safe when practical application.In addition, cross each serial connection branch because the electric current of battery pack mainly is an average flow, the electric current that in fact flows through electric conductor is very small, and needn't use thick electric conductor, therefore can effectively reduce the weight of integral battery door group.

Relevant further feature structure of the present utility model will cooperate each graphicly to be described in detail at execution mode.

Description of drawings

Fig. 1 is the battery connected mode circuit diagram of the utility model battery pack;

Fig. 2 is the practical structures exploded view of the utility model battery pack;

Fig. 3 is the outside drawing of the utility model battery pack;

Fig. 4 is the stereogram after the utility model battery pack connects;

Fig. 5 is the bottom perspective view of Fig. 4;

Fig. 6 is the stereogram of the utility model battery pack conducting strip;

Fig. 7 is the end view of the utility model conducting strip;

Fig. 8 is the stereogram of another embodiment of the utility model;

Fig. 9 is the upward view of Fig. 8;

Figure 10 is the stereogram of the another embodiment of the utility model;

Figure 11 is the circuit diagram that a known battery pack adopts the mode that is connected in series;

Figure 12 is the circuit diagram that a known battery pack adopts the mode that is connected in parallel;

Figure 13 is the three-dimensional structure diagram that above-mentioned Figure 12 battery pack adopts the mode that is connected in parallel.

The primary clustering symbol description:

11 batteries

12,13 power supply buses

20 serial connection branches

30 electric conductors

40 box bodys

41 perforates

42 cover plates

44 conducting strips

440 guide card bodies

441 ribs

442 sheet contacts

46 contact platforms

48 contacts

61,71 batteries

62 serial connection branches

63,64 power supply buses

72 and meet branch

73 electric conductors

Embodiment

See also shown in Figure 1ly, the connection of each single battery 11 in the utility model battery pack is to adopt the connection in series-parallel mixed architecture, is parallel with many serial connection branches 20 between two

power supply buses

12,13, and each is connected in series branch 20 and is composed in series in regular turn with a plurality of batteries 11.With regard to two adjacent serial connection branches 20, be connected with a plurality of electric conductors 30 between the two, form right-angled intersection and connect, make the battery 11 of a serial connection branch 20 be connected in series the battery 11 formations state in parallel of branch 20 with another.Connect into the formed battery pack of net like arranged combo architectures with aforementioned connection in series-parallel mixing, have series connection and advantage in parallel concurrently, and need not use thick electric conductor, more can reduce the overall weight of battery pack; As the electric conductor that

power supply bus

12,13 is used, because of being the total current transmission as the external power output of battery pack, its material then must should design according to the output rated specification of this battery pack in consideration.

Under normal condition, the electric current of battery pack mainly is that average flow is crossed each serial connection branch 20, and the electric current that flows through electric conductor 30 on the historical facts or anecdotes border is very small, and this also is the principal element that need not use thick electric conductor.

Referring to shown in Figure 2, during the practical application of the utility model battery pack, can place a box body 40 inside, covered with a cover plate 42 again, as shown in the figure, outermost power supply bus the 12, the 13rd is made of two conducting strips, and each conducting strip is to extend a plurality of sheet contacts and form with a side of a guide card body.

And all the other are between two

power supply buses

12,13, positive and negative the two poles of the earth of two adjacent a plurality of batteries 11 side by side are to connect by electric conductor, for example be that conducting strip 44 with a long and narrow is connected in the present embodiment, 44 of this conducting strips are according to above-mentioned circuit connecting mode shown in Figure 1 each row's single battery 11 to be mixed with connection in series-parallel to connect into the net like arranged and constitute, and the concrete structure of relevant this conducting strip 44 reaches and the combination of each battery 11 will be in being described in detail after a while.The battery pack of finishing the circuit connection promptly places box body 40 inside, covers (as shown in Figure 3) with these cover plate 42 correspondences again.

Consult shown in Figure 3, the heat energy problem that is produced when considering the battery pack running, on the sidewall of aforementioned box body 40, form the heat radiation perforate 41 that runs through inside and outside both sides, this perforate can be the oblique design that the inboard is higher than the outside, can have concurrently box body 40 inner hot gas can prerequisite to outdiffusion under, also reduce outside liquid and flow directly into, to avoid damaging internal cell 11 to the probability of box body 40 inside.

See also Fig. 4～shown in Figure 7, mention in the explanation that in front those a plurality of batteries 11 in a row are to utilize conducting strip 44 just connecting it, negative pole, and the detailed construction of this conducting strip 44 is as Fig. 6, it is the sheet contact 442 that extends a plurality of symmetries with the left and right sides of a guide card body 440, see its (as shown in Figure 7) from conducting strip 44 sides, guide card body 440 is slightly curved with the sheet contact 442 of symmetry, this conducting strip 44 is to make with metal material, preferable material is the sheet metal formation that is formed with nickel material with the surface, for example simple nickel sheet, or the upper and lower surface layer is the nickel sheet, the intermediate layer is constituted by copper sheet folded mutually (Clad) etc., because nickel material has corrosion-resistant, conductivity is good, advantages such as cost is cheap are so be suitable in the battery pack of the present utility model.Conducting strip 44 shown in the figure only belongs to a preferred embodiment, this conducting strip 44 can be guide card body 440 wherein a side extend sheet contact 442 and form, or the sheet contact 442 that extends asymmetric geometry in guide card body 440 both sides forms; And this sheet contact 442 can be integrally formed with guide card body 440, or is connected to each other combination again after each self-forming.

This guide card body 440 itself is formed with slight curving rib 441, look from the side and have radian, this kind design can be in battery pack during when the external force that is subjected to pushing from the top down, the rib 441 of this guide card body 440 will be out of shape and absorption pressure, makes conducting strip 44 be unlikely to therefore to come off from battery 11.As for this sheet contact 442 is a rectangle lamellar body, central authorities form the slit of one U font and the breach of this slit of connection, make this rectangle lamellar body be split into three contact points, the plus or minus that all is welded in each battery 11 end faces is extremely gone up, therefore when battery 11 is subjected to the external force of very big horizontal direction, the left and right contact point that is positioned at the outside can the absorption portion impulsive force, and the U-shaped contact point that mediates because of between receive minimal impact power and be firmly attached on battery 11 end faces.Aforementioned each sheet contact 442 corresponding wherein utmost points that connect each single battery 11.And be positioned at outermost two conducting strips 44 of battery pack, a contact platform 46 is extended in its body stage casing, is formed with the contact 48 that is connected with the power lead (not shown) on this contact platform 46, and this contact 48 can be made of bolt, for screwing togather locking with power lead, this contact 48 can be any form.

The point-like of comparing in the past is welded to connect, sheet contact 442 on the aforementioned conducting strip 44 of the utility model has proper area and distributing point and battery 11 corresponding connections, therefore no matter be the connection processing operation (for example welding) of adopting which kind of mode, being connected quality and can obtaining higher reliability and degree of safety between this sheet contact 442 and the battery 11.And analyze from another point of view, the higher small-sized secondary batteries of safety in utilization extremely is applicable in the battery pack of the present utility model, with preferable specification, employed battery central point apart from the beeline of housing outer rim between 0.5cm～3.5cm, the secondary cell kind, for example lithium ion battery, lithium macromolecule battery, Ni-MH battery or hydrogen oxygen fuel cell etc., cell shapes is not then limit.Constitute the number of battery cells of integral battery door group, is constituted, and the load with the driving connection of enough output voltage still can be provided with at least 4 * 4 battery arranged combination.

As Fig. 8, shown in Figure 9, be the embodiment that adopts rectangular cell, lithium ion battery (dihedral battery, duralumin housing battery) for example, (promptly an end salient point place is a negative pole though the proper polarity with cylindrical battery of the positive-negative polarity of its rectangular cell 11 is opposite, other holds tabular surface is anodal), but still be to connect into circuit framework shown in Figure 1 by a plurality of conducting strips 44.

And shown in Figure 10 also be a kind of of rectangular cell, for example lithium macromolecule battery (Lithium polymerbattery), flexible packing lithium ion battery (Advance lithium-ion battery, Laminatedlithium-Ion battery), but both positive and negative polarity is to extend out with the same end that two pole pieces are positioned at battery 11, therefore the positive-negative polarity of battery 11 is arranged in regular turn, connects side by side with conducting strip 44 again.

In addition, when the angle of power density (Power density) is come comparison the utility model battery pack with general known combination framework, more can highlight effect of the present utility model and promote.The typical in the past the highest 700W/kg that is about of power density, for example using the power density at notebook computer approximately is 600W/kg.And the power density that the utility model can provide, then much larger than 1000W/kg.

In sum, battery pack of the present utility model connects into net like arranged combo architectures with the connection in series-parallel mixing, make battery pack when practical application, have higher power and reliable and fail safe, and battery pack need not used the thick electric conductor of high load capacity, also help to alleviate overall weight, effect of the present utility model possesses significant function and breaks through and the benefit lifting compared to known in the past battery pack, and is special according to Patent Law proposition utility model application.

Claims

1, a kind of battery pack is characterized in that comprising:

A plurality of electric conductors are connected between two adjacent serial connection branches, a serial connection branch are connected in series constitute between two adjacent each single battery in the branch in parallel with another, form the net like arranged assembled state that a connection in series-parallel mixes connection.

2, battery pack as claimed in claim 1 is characterized in that, described a plurality of batteries are chargeable secondary cell.

3, battery pack as claimed in claim 2 is characterized in that, described a plurality of batteries are lithium ion battery.

4, battery pack as claimed in claim 2 is characterized in that, described a plurality of batteries are lithium macromolecule battery.

5, battery pack as claimed in claim 2 is characterized in that, described a plurality of batteries are Ni-MH battery.

6, battery pack as claimed in claim 2 is characterized in that, described a plurality of batteries are hydrogen oxygen fuel cell.

7, battery pack as claimed in claim 1 is characterized in that, between 0.5cm～3.5cm, battery pack forms with at least 4 * 4 number of battery cells arranged the central point of each single battery apart from the beeline of its housing outer rim.

8, battery pack as claimed in claim 1 is characterized in that, each electric conductor utilizes a conducting strip to constitute.

9, battery pack as claimed in claim 8 is characterized in that, the material of described conducting strip is to constitute with the nickel sheet.

10, battery pack as claimed in claim 8 is characterized in that, described conducting strip is the sheet metal formation that is formed with the nickel material with the surface.

11, battery pack as claimed in claim 8 is characterized in that, described conducting strip is that above undersurface layer is that nickel sheet intermediate layer is constituted by copper sheet is folded mutually.