CN101083317A

CN101083317A - Secondary batteries

Info

Publication number: CN101083317A
Application number: CNA2006100834579A
Authority: CN
Inventors: 汪鲁建; 吴强; 颜海鹏
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2006-05-31
Filing date: 2006-05-31
Publication date: 2007-12-05

Abstract

The invention relates to a secondary battery, including outer covering (11), terminals (12), anode pole-group (13), cathode pole-group (14), membrane (15) and the first current collector (16), of which, the both sides of the first current collector (16) separately connect terminals (12), anode pole-group (13), and cathode pole-group (14) directly. The secondary battery which is provided by the invention, not only causes the current collector and the terminals can directly compact-connect by no using the nickel strap or other medium, thus avoided the locked rotor current, moreover the pole-group current can directly induct into the terminals through the current collector end surface, and thus the resistance which produced by the electric current through current collector process reduced obviously, therefore effectively reduced interface resistance of battery, enhanced capacity of the secondary battery and the big electric current electric discharge performance obviously. At the same time, the invention provided secondary battery also has the simple structure, and easy to install and so on merits.

Description

A kind of secondary cell

Technical field

The present invention relates to field of batteries, more specifically, relate to a kind of secondary cell.

Background technology

At present along with being extensive use of of various portable power tools, also constantly improving as the secondary cell of electric tool driving source, improving its capacity and heavy-current discharge performance, thereby meet the need of market.But, being formed with bigger locked rotor current and resistance in the existing secondary cell, this has become the main factor that influences battery capacity and heavy-current discharge performance.

A kind of secondary cell is disclosed among the CN2681364Y, as shown in Figure 1, this secondary cell comprises: shell 1, positive terminal 2, anodal utmost point group 3, negative pole utmost point group 4 and flow collection sheet 6, wherein, described flow collection sheet 6 is made up of solder terminal end face 6a, conduction axle center 6b and afflux end face 6c three parts, and positive terminal 2 closely is connected with solder terminal end face 6a, and anodal utmost point group 3 closely is connected with afflux end face 6c, as shown in Figure 2.

Secondary cell with said structure, though solved conventional batteries owing to utilize the nickel strap of bending to connect flow collection sheet and positive terminal, and the easy defective that forms locked rotor current at this bending part, but, because the electric current of anodal utmost point group 3 is after passing through afflux end face 6c afflux, also must be by conduction axle center 6b and solder terminal end face 6a, could import positive terminal 2, and in this process, conduction axle center 6b and solder terminal end face 6c must have a resistance, so the capacity of battery and heavy-current discharge performance will be subjected to very big influence.

Summary of the invention

The purpose of this invention is to provide the secondary cell that a kind of big capacity and heavy-current discharge performance significantly improve.

Secondary cell provided by the invention comprises shell, terminal, anodal utmost point group, negative pole utmost point group, barrier film and first current collector, and wherein, the two sides of first current collector directly is connected with anodal utmost point group or negative pole utmost point group with terminal respectively.

Secondary cell provided by the invention, not only make current collector and terminal can utilize nickel strap or other medium and directly closely be connected, thereby avoided the generation of locked rotor current, and the end face of the electric current that can make utmost point group by current collector directly imports terminal, thereby electric current will obviously reduce through the resistance that produces in the process of current collector, therefore effectively reduce the internal resistance of battery, make the capacity of secondary cell and heavy-current discharge performance be significantly increased.Simultaneously, secondary cell provided by the invention also has simple in structure, is convenient to advantages such as assembling.

Description of drawings

Fig. 1 is the structural representation of disclosed secondary cell among the CN2681364Y;

Fig. 2 is the partial enlarged drawing of Fig. 1;

Fig. 3 is the structural representation of secondary cell provided by the invention;

Fig. 4 is the structural representation of secondary cell provided by the invention.

Embodiment

Secondary cell provided by the invention comprises shell 11, terminal 12, anodal utmost point group 13, negative pole utmost point group 14, barrier film 15 and first current collector 16, wherein, the two sides of first current collector 16 directly is connected with anodal utmost point group 13 or negative pole utmost point group 14 with terminal 12 respectively, as shown in Figure 3.Usually, terminal 12 can be realized closely being connected with the contact-making surface between first current collector 16 by variety of way well known in the art, and is preferred, directly closely welds together with first current collector 16 by a plurality of solder joints that are distributed on the terminal 12.First current collector 16 also can be realized closely being connected with the contact-making surface between anodal utmost point group 13 or the negative pole utmost point group 14 by variety of way well known in the art, and is preferred, closely welds together between the two.For two surfaces that make first current collector 16 directly closely are connected with anodal utmost point group 13 or negative pole utmost point group 14 with terminal 12 respectively, first current collector 16 is a writing board shape, and can form circular flat board, elliptical plate or polygon flat board etc. as required.

A kind of concrete execution mode according to the present invention, terminal 12 is a positive terminal, and first current collector 16 is the anode collection device, and the two sides of this anode collection device directly is connected with anodal utmost point group 13 with positive terminal respectively.

Under the preferable case, as shown in Figure 4, secondary cell provided by the invention also comprises the safety valve 17 that is positioned at terminal 12 inside, and terminal 12 is projected on the part of shell 11 outsides and comprises bleeder port 18.The structure of described safety valve 17, shape and material are not particularly limited, and can use various safety valve well known in the art.Described bleeder port 18 can be positioned at the optional position on the part that terminal 12 is projected into shell 11 outsides, as upper surface or side etc., is preferably placed at the side of terminal 12.When assembled battery, safety valve is subjected to compression to a certain degree, and so under normal circumstances, the interior pressure of battery is less, and safety valve is in sealing state.When battery sharply increases owing to unexpected reason causes pressing in it, safety valve will in time start, and discharge gas and impurity by gas bleeder valve, with the interior pressure of timely reduction battery.

Under the preferable case, secondary cell provided by the invention also comprises second current collector 19 that is positioned at shell 11 end relative with first current collector 16, and wherein the two sides of second current collector 19 directly is connected with negative pole utmost point group 14 or anodal utmost point group 13 with the inner bottom surface of shell 11 respectively.Usually, between negative pole utmost point group 14 or anodal utmost point group 13 and second current collector 19 and the contact-making surface between the inner bottom surface of second current collector 19 and shell 11 can realize closely being connected by variety of way well known in the art, preferably, by welding tight connection.For two surfaces that make second current collector 19 directly closely are connected with the inner bottom surface of negative pole utmost point group 14 or anodal utmost point group 13 and shell 11 respectively, second current collector 19 is a writing board shape, and can form circular flat board, elliptical plate or polygon flat board etc. as required.

According to a kind of concrete execution mode of the invention described above, be positive terminal promptly at terminal 12, first current collector 16 is the anode collection device, the two sides of this anode collection device respectively with positive terminal and anodal utmost point group 13 direct-connected situations under, described second current collector 19 is the negative pole currect collecting device, and the two sides of this negative pole currect collecting device directly is connected with negative pole utmost point group 14 with the inner bottom surface of shell 11 respectively.

Need to prove at last, fastening for guaranteeing the battery assembling, the cover plate that is sleeved on the terminal can be set in the enclosure, and can adopt between terminal and the cover plate and well known to a person skilled in the art variety of way, wait as welding and realize connecting.For guaranteeing the sealing of battery, can sealing ring be set in battery, buckle circle etc. simultaneously.As known in those skilled in the art, above-mentioned and necessary structure of other secondary cells and assembling are not repeated them here.

Claims

1. secondary cell, comprise shell (11), terminal (12), anodal utmost point group (13), negative pole utmost point group (14), barrier film (15) and first current collector (16), it is characterized in that the two sides of first current collector (16) directly is connected with anodal utmost point group (13) or negative pole utmost point group (14) with terminal (12) respectively.

2. secondary cell according to claim 1, wherein, the contact-making surface between terminal (12) and first current collector (16) welds together by solder joint and first current collector (16) that is distributed on the terminal (12).

3. secondary cell according to claim 1, wherein, between first current collector (16) and anodal utmost point group (13) or the negative pole utmost point group (14) by being welded to connect.

4. secondary cell according to claim 1, wherein, first current collector (16) is a writing board shape.

5. secondary cell according to claim 4, wherein, first current collector (16) is circular flat board, elliptical plate or polygon flat board.

6. secondary cell according to claim 1, wherein, described secondary cell also comprises and is positioned at the inner safety valve (17) of terminal (12), terminal (12) is projected on the part of shell (11) outside and comprises bleeder port (18).

7. secondary cell according to claim 1, wherein, described secondary cell also comprises second current collector (19) that is positioned at shell (a 11) end relative with first current collector (16), and the two sides of second current collector (19) directly is connected with negative pole utmost point group (14) or anodal utmost point group (13) with the inner bottom surface of shell (11) respectively.

8. secondary cell according to claim 7, wherein, between negative pole utmost point group (14) or anodal utmost point group (13) and second current collector (19) and/or between the inner bottom surface of second current collector (19) and shell (11) by being welded to connect.

9. secondary cell according to claim 7, wherein, second current collector (19) is a writing board shape.

10. secondary cell according to claim 9, wherein, second current collector (19) is circular flat board, elliptical plate or polygon flat board.