This invention relates to a power battery, and particularly to a soft package lithium ion power battery.
Based on the requirements of voltage and power of electrical equipment, most of soft package lithium ion power batteries are used at present by connecting the individual battery to each other in series and parallel randomly. There has not been a convenient and reasonable connecting combination mode. Except that it is very easy to damage the native delicate batteries mechanically, the method of combining naked individual soft package batteries randomly also results in over length wires, poor contact and excessively large contact resistance which further cause safety problems due to complicated connections and non-normative operations.
The object of the present invention is to provide a soft package lithium ion power battery module in order to overcome the shortcomings of the prior art.
In order to achieve the above object, the invention provides a soft package lithium ion power battery module, comprising:
a battery case including two opposite sidewalls for setting pole connection terminals;
a plurality of soft package lithium ion power batteries assembled in said battery case, each battery having a positive electrode tab and a negative electrode tab;
a connector for selectively electrically connecting said positive and negative electrode tabs of said plurality of batteries so as to connect said plurality of batteries in series or parallel for forming a battery group and then forming positive and negative poles of said battery group;
two positive pole connection terminals being electrically connected to said positive pole of said battery group, and face-to-face set on said two opposite sidewalls of said battery case respectively, and exposing to the external of said battery case;
two negative pole connection terminals being electrically connected to said negative pole of said battery group, and face-to-face set on said two opposite sidewalls of said battery case respectively, and exposing to the external of said battery case;
wherein the placement of said connection terminals set on said sidewalls is like that: when a plurality of said battery modules are connected in series or in parallel, two connection terminals on the butted sidewall of said battery module face to two connection terminals on the butted sidewall of the adjacent battery module respectively.
This invention has the following beneficial effects:
1) In this invention, a certain number of soft package lithium ion power batteries are set in a case to form a module so as to protect the soft package batteries from being mechanically damaged;
2) In this invention, the standard battery modules of different specifications can be constructed by appropriately selecting the electrical connection manner (in series or parallel) between batteries in the module and the number of batteries;
3) In this invention, a plurality of battery modules can be simply and conveniently fixed to each other in series or parallel by appropriately disposing connection terminals of the battery module; further, the connection manner and number of battery modules can be appropriately selected based upon the requirements of voltage and power of the electrical equipment;
4) In the preferred embodiments of this invention, electrode tabs are electrically connected with plate-shaped connectors so as to improve contact conditions effectively and reduce contact resistance;
5) The soft package lithium ion power battery module of this invention features in simplicity and normalization, thus ensuring safe and reasonable utilization of the battery and giving full play to the performance of the battery,
a) schematically shows the connection in parallel between two battery modules of this invention;
b) schematically shows the connection in series between two battery modules of this invention;
a) schematically shows the connection in parallel between the batteries which are in a single battery module;
b) schematically shows the connection in series between the batteries which are in a single battery module.
Referring to the battery module shown in
Four openings 5 are located on two opposite sidewalls of the battery case 1, each sidewall having two openings 5 for accommodating or imbedding the connection terminals of the battery module, which are exposed to external of the battery case 1. The connection terminal can be a conductive connection board, which is set in the opening 5 and parallel to the sidewall.
As shown in
The placement of four connection terminals of the battery module is clearer in
b), when two battery modules are connected in series, they are placed face-to-face with the directions thereof turning 180 degrees relative to each other. Thus, the positive pole connection terminals and the negative pole connection terminals on the two butted sidewalls to be connected are face-to-face, and then one of the positive pole connection terminals is electrically connected to the negative pole connection terminal to which it is facing. Although
In each battery module, a connector 2 is used for electrically connecting a plurality of batteries 3, as shown in
a) and 5(b) show arrangement manners of a plurality of batteries 3 and electrode tabs 4 thereof in the single battery module, wherein the symbols (+) and (−) schematically denote positive and negative electrode tabs of the battery 3 in the two drawings. As shown in
As shown in
The selectively electrical connection between connector plates 2 and electrode tabs 4 of the batteries 3 will be further described by reference to
In the case of series connection shown in
When the battery group in the battery module is the parallel battery group shown in
When the batteries of even number are connected in series, it is readily appreciated that the positive and negative poles of the battery group can be presented on the same connector plate 2, so additional conductive connectors are desired for connecting the positive pole of the battery group to two positive pole connection terminals (+) and connecting the negative pole of the battery group to two negative pole connection terminals (−) respectively. Preferably, the additional conductive connectors are conductive plates or thick wires of low resistance.
In order to connect the plurality of modules in parallel or in series as shown in
Two applicable embodiments of battery modules of this invention will be described as follows.
Four batteries 3 of 100 Ah, 4V with good uniformity of various parameters are stacked in regular to form a battery group. The positive electrode tabs 4 and negative electrode tabs 4 of the batteries 3 are connected in parallel by two U-shaped connector plates 2 respectively. Then the batteries are placed in a battery case 1, thus forming a battery module of 400 Ah, 4V (actually 3.7V). N modules of 400 Ah, 4V are connected in parallel by the bolts through the connecting holes 6 in the connection boards of the sidewalls so as to obtain a 4V lithium ion battery power supply having a capacity of n*400 Ah. If such n modules are connected in series by the bolts, a n*4V lithium ion battery power supply having a capacity of 400 Ah will be obtained. The battery case 1 injection molded with flame retardant ABS plastic is of the size just to accommodate the four selected 100 Ah soft package lithium ion batteries 3. The length of the connector plate 2 is the same as the thickness of the battery case 1, and the width of the connector plate 2 equals to that of the electrode tabs 4 of the batteries. Both ends of the connector plate 2 are bent by 90° toward the same direction with a hem height of 20 mm so as to form a connection board, on which is provided two connecting holes 6. The connector plates 2 are made from a copper sheet with a thickness of 1 mm.
Three soft package lithium ion batteries 3 of 100 Ah, 4V are stacked in regular and connected in series. The positive electrode tabs 4 and negative electrode tabs 4 of the series batteries are connected to one respective connector plate 2 respectively. Then the batteries 3 are placed in a battery case 1 to form a lithium ion battery module of 12V, 100 Ah. If such n modules are connected in series with bolts, a lithium ion battery power supply of 12V*n, 100 Ah will be obtained.
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/CN06/00423 | 3/20/2006 | WO | 00 | 9/19/2008 |