DE102006035100B4 - Secondary lithium battery with conductive connection of conductor pins - Google Patents

Abstract

Secondary lithium battery, wherein a center rod (30) is provided in a battery housing (20), and wherein two end sections of the center rod (30) are connected to two respective battery connection terminals (50), and wherein the center rod (30) is externally spiraled with one wound electrode assembly (40) is provided, and wherein two clamping units (60) establish an electrical connection between the side edges of the electrode assembly (40) and the battery connection terminals (50), whereupon battery components with respective mounting nuts (70) attached to the battery housing (20) and closed a battery, characterized in that the electrode structure (40) consists of an anode layer (41), a cathode layer (42) and at least one insulation layer (43), an anode substance (411) being applied to the surface of the anode layer (41) and a cathode substance (421) are applied to the surface of the cathode layer (42), and wherein the insulation layer (43) between hen the anode layer (41) and the cathode layer (42) is provided, and wherein the anode layer (41) is provided on one side with a positive conductor pin (44), ...

Description

The invention relates to a conductive connection structure of conductor pins of a secondary lithium battery, in particular a structure for connecting the conductor pins extending from a spirally wound electrode assembly with battery terminal clamps.

State of the art

A secondary lithium battery in the construction of a biscuit roll is, as in the 1 and 2 shown off US 5,849,431 A known, wherein a spirally wound electrode assembly 10 by row-like superimposition of an anode layer 11 , a separating layer 12 and a cathode layer 13 and by wrapping around a central rod 14 arises. In construction according to 1 and 2 is a variety of saw-shaped conductor pins 111 . 131 especially on one side of the anode and cathode layers 11 . 13 provided, which is formed by pre-cutting. The electrical energy may be from the spirally wound electrode assembly 10 be derived by the respective conductor pins 111 . 131 concentrated with the outer edge of a disk-shaped battery terminal 15 are welded together.

How out 3 As can be seen, a construction of a secondary lithium battery is known in which multiple conductor pins 111 . 131 first on one side of an anode layer 11a or a cathode layer 13a a spirally wound electrode assembly 10 be welded, whereupon the end portions of the conductor pins 111 . 131 outside on battery connection terminals 15a be welded. In this way, the electrical energy of the spirally wound electrode assembly 10 led out of the battery.

Regardless of whether it is the integrally formed or the welded conductor pins, the electrical connection of the conductor pins to the battery terminals of the prior art usually by welding the conductor pins in succession to the battery terminals. It should be noted that the high capacity battery normally requires many conductor pins inside the battery. The numerous conductor pins reduce the internal battery impedance to meet the requirements for high capacity charge and discharge of the high capacity battery. However, the welding process of the numerous conductor pins to the respective battery terminals requires a great deal of energy and time. In addition, the method of manufacturing the battery is greatly complicated and complicated.

Various constructions of secondary lithium batteries with a spirally wound electrode structure are described, for example, in US Pat GB 2 221 565 A and the EP 1 139 458 A2 described. Furthermore, goes from the DE 39 22 596 A1 also a secondary lithium battery forth, which is referred to here as a winding cell type galvanic cell. In this winding cell, the electrical contact between an end pole guided through the cell cover and the band electrode associated therewith is closed via a connecting element which has been preassembled from a contact disk with a welded-on contact clip, an insulating disk and a spiral cone spring. After inserting this connecting element into the cup and depressing the spring, a bead introduced into the cup wall fixes the state in which the contact disk is pressed onto the edge of the band electrode. The contact to the end pole is made via a plug connection between the end pole and the contact clip.

Another arrangement of a secondary lithium battery with a conductive, spirally wound electrode assembly goes from the post-published utility model DE 20 2006 010 635 U1 out. Within the battery housing of the lithium battery, a center bar is arranged, whose two end portions are connected to two respective battery terminals. The spirally wound electrode assembly consists of an anode layer, a cathode layer and at least one insulating layer, wherein an anode material and a cathode material is applied to the surface of the anode layer and the cathode layer, respectively. In addition, an insulating layer is disposed between the anode layer and the cathode layer.

task

The invention has for its object to provide a conductive connection structure of conductor pins of a secondary lithium battery in which using a terminal opening of the clamping units a direct, full-surface clamping and connection of the conductor pins and the battery terminals takes place, wherein no welding operation is required. In addition, it is avoided that the conductor pins must be connected in succession to the battery terminals. The inventive configuration of the operation of the numerous conductor pins is simplified to a considerable extent. At the same time the production and installation costs are greatly reduced.

This object is achieved by a conductive connection structure of conductor pins of a secondary lithium battery having the features specified in claim 1. Further advantageous developments of the invention are apparent from the subsidiary and subordinate claims.

embodiment

In the following, the invention and its embodiments will be explained in more detail in connection with the figures. Show it:

1 a perspective view of one of the US 5,849,431 A known construction;

2 a perspective view of one of the US 5,849,431 A known construction, in which the conductor pins are welded to a current conductor;

3 a section through a lithium battery according to the prior art;

4 a perspective view of a spirally wound electrode assembly according to the invention in spiral connection with a central rod;

5 a perspective view of a clamping unit according to the invention before clamping the conductor pins;

6 a perspective view of the clamping unit according to the invention after clamping the conductor pins;

7 an enlarged section 6 ;

8th an axial section through the construction according to the invention, which is located in the battery case;

9 a perspective view of a clamping unit before clamping the integrally formed conductor pins;

10 a perspective view of a clamping unit after clamping the integrally formed conductor pins;

11 a perspective view of a clamping unit after clamping another integrally formed conductor pin;

12 a perspective view of another clamping unit before clamping a spirally wound electrode assembly; and

13 an enlarged section of the further clamping unit after clamping the spirally wound electrode assembly.

Referring to the 4 to 8th For example, an inventive conductive connection structure of conductor pins of a secondary lithium battery has a battery case 20 in which a center pole 30 is provided, wherein two end portions of the central rod 30 with two respective battery terminals 50 are connected, and wherein the center bar 30 outside with a spirally wound electrode assembly 40 is provided. The spirally wound electrode structure 40 has both positive and negative conductor pins at its two end sections. Two clamping units 60 provide electrical connection of the positive and negative conductor pins to the respective battery terminals 50 forth, whereupon battery components with respective mounting nuts 70 on the battery case 20 attached and assembled into a battery.

The battery case 20 has at its two ends in each case an opening 21 on, with battery parts inside the battery case 20 are provided. The opening 21 is with an end cap 22 closed, with the end cap 22 a through hole 221 has, from which protrude the battery parts.

The center bar 30 is designed as an insulation structure and inside the battery case 20 stored. The center bar 30 is at its two ends, each with a connecting portion 31 provided, which is designed as a plug hole.

The spirally wound electrode structure 40 consists of an anode layer 41 , a cathode layer 42 and at least one insulation layer 43 , wherein an anode material 411 and a cathode material 421 on the surface of the anode layer 41 or the cathode layer 42 are applied, and wherein the insulating layer 43 between the anode layer 41 and the cathode layer 42 is provided, and wherein at least one positive conductor pin 44 on one end side of the anode layer 41 is welded, while at least one negative conductor pin 45 on one end side of the cathode layer 42 is welded. The anode layer 41 , the insulation layer 43 and the cathode layer 42 are arranged one above the other in succession, whereupon they one after the other on the center bar 30 to the spirally wound electrode structure 40 the battery are wound. The positive and the negative conductor pins 44 are on both end sides of the spirally wound electrode assembly 40 arranged.

Each of the battery connection terminals 50 is conductive, with the battery terminal 50 one end in the form of a rod 511 trained, in connection with the connecting section 31 the center bar 30 standing connection section 51 and at the other end one in the form of a spindle trained exit section 52 having. The battery connection terminal 50 is in the area between the connection section 51 and the exit section 52 with a flange 53 and a collection section 54 Mistake. The collection section 54 is located on a positive conductor pin 44 or the negative conductor pin 45 of the spirally wound electrode assembly 40 facing point, while the flange 53 against the end cap 22 of the battery case 20 is applied.

Each of the clamping units 60 has a clamping band 61 , a knob 62 and a mounting frame 63 on, with the knob 62 at its periphery with an external thread 621 is provided while the clamping band 61 on its surface with a plurality of tooth grooves 611 is provided. A clamp opening 64 is from the clamping band 61 limited after the knob 62 and the clamping band 61 through the mounting frame 63 go through, with the external thread 621 and the tooth grooves 611 mesh. The clamping opening 64 is by turning the knob 62 smaller or larger. The clamping units 60 are with their clamp openings 64 outside on the positive and the negative conductor pins 44 . 45 mounted, whereby a solid, electrical connection of the collecting section 54 the battery connection terminals 50 with the positive and the negative conductor pins 44 . 45 of the spirally wound electrode assembly 40 takes place by the clamping opening 64 is reduced.

After the spirally wound electrode assembly 40 via the clamping units 60 with the center bar 30 and the battery connection terminals 50 is connected, then the output sections 52 the battery connection terminals 50 through the respective through holes 211 the end caps 22 passed through, with the flange 53 against the inner end surface of the end cap 22 is depressible. In this way, the mounting nut 70 on the exit section 52 be screwed on, resulting in a firm connection of the battery parts with the battery case 20 guaranteed.

What has been described above concerns the configuration of a conductive connection structure of ladder pins of a secondary lithium battery according to the invention and the relative positions of the components. Through the clamping units 60 there is a direct electrical connection of the conductor pins with the battery connection terminals 50 without requiring a welding process. This results in a relief of the manufacturing process of the battery. The large-area contact between the conductor pins and the battery terminal clamps effectively reduces the battery impedance, which can meet the charge and discharge requirements of a large amount of current. In the following, the operation according to the present invention will be described with reference to the corresponding figures.

The spirally wound electrode assembly can provide a large area electrical connection to the battery terminal 50 enable.

Like from the 4 to 7 You can see the battery connection terminals 50 in the middle. In addition, each of the battery terminals indicates 50 a conductive collection section 54 on, on one of the positive or negative conductor pins 44 . 45 of the spirally wound electrode assembly 40 facing point is arranged. With electrical connection of the positive or negative conductor pins 44 . 45 with the respective battery connection terminals 50 become the clamping openings 64 the clamping units 60 outside on the positive or negative conductor pins 44 . 45 assembled. Then comes the external thread 621 the knob 62 engaged with the tooth grooves 611 of the clamping band 61 by turning the knob 62 is turned. In this way, the clamping band goes 61 through the mounting frame 63 through, the clamping opening 64 is gradually reduced. Will the clamping opening 64 as long as reduced, until the clamping band 61 , the collection section 54 and the positive or negative conductor pins 44 . 45 are firmly connected to each other, the process of electrical connection of the positive or negative conductor pins 44 . 45 with the battery connection terminals 50 completed. In the meantime, no welding process is needed at all.

It should be noted that the electrical connection of the positive or negative conductor pins 44 . 45 with the battery connection terminals 50 characterized in that the clamping opening 64 the clamping units 60 once all positive or negative conductor pins 44 . 45 and the battery connection terminals 50 clamped, with no welding process is required. This avoids that the conductor pins must be clamped one after the other. By the configuration of the present invention, the connecting operation of the plurality of high-capacity battery conductor pins with the battery terminals becomes 50 relieved to a considerable extent. At the same time the production and installation costs are greatly reduced. Further, between the positive and negative conductor pins 44 . 45 and the respective collection sections 54 the battery connection terminals 50 an electrical connection in large-area contact possible, which contributes to the reduction of the internal battery impedance.

In the above-mentioned embodiment, all are positive conductor pins 44 or all negative conductor pins to the spirally wound electrode assembly 40 welded. In the 9 and 10 is shown that the anode layer 41a and the cathode layer 42a is provided at its edge portion in each case with a region to which no anode material or cathode material is applied. These two areas are cut so that the positive conductor pins 44a or the negative conductor pins are integrally formed. By pinching the positive conductor pins 44a or the negative conductor pins with the respective clamping units 60a is a solid, electrical connection of the positive conductor pins 44a or the negative conductor pins with the collecting section 54a the battery connection terminals 50a possible. Alternatively, the integrally formed positive conductor pins 44a and the integrally formed negative conductor pins are formed close to each other. How out 11 it can be seen only one separation gap 80 between the positive conductor pins 44b or the negative conductor pins. This will make the positive conductor pins 44b and the negative conductor pins separated a small distance. In this case, the positive or the negative conductor pins 44b also by the clamping units 60b with the collection section of the battery terminals 50 be connected.

It should be noted that the mounting frame of the clamping units 60c is integrally connected to the knob. Like from the 12 and 13 it can be seen a latching section 631 inside the mounting frame 63 provided with integrally formed, unidirectional teeth, so that the locking portion 631 replaced the knob. In this way, the teeth of the locking portion engage 631 in a single direction into the tooth grooves 611a of the clamping band 61a one, if the clamping band 61 through the mounting frame 63a passes. This results in the reduction of the clamping opening 64a what a firm and electrical connection of the positive conductor pins 44c or the negative conductor pins 45c provides.

Using the clamp opening 64 the clamping units 60 there is an immediate clamping of the conductor pins and the battery terminals 50 , In the meantime, no welding is required. In addition, once electrical connection of the conductor pins to the battery terminals 50 possible with little time, whereby the operation is greatly facilitated and the production costs are reduced to a considerable extent.

LIST OF REFERENCE NUMBERS

10

spirally wound electrode assembly

10a

spirally wound electrode assembly

11

anode layer

111

conductor pin

111

conductor pin

131

conductor pin

131

conductor pin

12

Interface

13

cathode layer

14

Central staff

15

Battery terminal

15a

Battery terminal

20

battery case

21

opening

22

endcap

221

Through Hole

30

center bar

31

connecting portion

311

drilling

40, 40a

spirally wound electrode structure

41, 41a

anode layer

411

anode material

42

cathode layer

421

cathode material

43

insulation layer

44, 44a, 44b, 44c

positive conductor pin

45

negative conductor pin

50, 50a, 50b, 50c

Battery terminal

51

connecting portion

52

output section

53

flange

54, 54a, 54c

collecting section

60, 60a, 60b, 60c

terminal unit

61, 61a

clamp band

611, 611a

tooth groove

62

knob

621

external thread

63, 63a

mounting frame

631

detent portion

64, 64a

terminal opening

70

mounting nut

80

separating gap

Claims (3)

Secondary lithium battery, whereby in a battery case ( 20 ) a middle bar ( 30 ) is provided, and wherein two end portions of the central rod ( 30 ) with two respective battery terminals ( 50 ) and the center bar ( 30 ) on the outside with a spirally wound electrode structure ( 40 ), and wherein two clamping units ( 60 ) an electrical connection between the side edges of the electrode assembly ( 40 ) and the battery terminals ( 50 ), whereupon battery components with respective mounting nuts ( 70 ) on the battery housing ( 20 ) and assembled into a battery, characterized in that - the electrode structure ( 40 ) from an anode layer ( 41 ), a cathode layer ( 42 ) and at least one insulation layer ( 43 ), wherein an anode substance ( 411 ) on the surface of the anode layer ( 41 ) and a cathode material ( 421 ) on the surface of the cathode layer ( 42 ) are applied, and wherein the insulating layer ( 43 ) between the anode layer ( 41 ) and the cathode layer ( 42 ), and wherein the anode layer ( 41 ) on its one side with a positive conductor pin ( 44 ), on which no anode substance ( 411 ), while the cathode layer ( 42 ) on a positive conductor pin ( 44 ) opposite side with a negative conductor pin ( 45 ), on which no cathode material ( 421 ), and wherein the positive conductor pin ( 44 ) and the negative conductor pin ( 45 ) from the respective sides; - that each of the battery terminals ( 50 ) is conductive, the battery terminal ( 50 ) at one end in communication with the connecting portion ( 31 ) of the center rod ( 30 ) standing connecting section ( 51 ) and at its other end an exit section ( 52 ), and wherein the battery terminal ( 50 ) in the region between the connecting section ( 51 ) and the output section ( 52 ) with a flange ( 53 ) and a collection section ( 54 ), and wherein the collecting section ( 54 ) on a positive conductor pin ( 44 ) or the negative conductor pin ( 45 ) of the electrode structure ( 40 ) while the flange (FIG. 53 ) against an end cap ( 22 ) of the battery case ( 20 ) is present; and - that each of the clamping units ( 60 ) at least one clamping band ( 61 ) and a mounting frame ( 63 ), in which there is a latching portion, wherein the clamping band ( 61 ) on its surface with a plurality of tooth grooves ( 611 ), and wherein a clamping opening ( 64 ) from the clamping band ( 61 ) is limited after the clamping band ( 61 ) through the mounting frame ( 63 ), and wherein the latching portion ( 631 ) in one of the tooth grooves ( 611 ) is locked in one direction, whereby the size of the clamping opening ( 64 ), and wherein the clamping units ( 60 ) with their clamping openings ( 64 ) on the outside of the positive (44) or the negative conductor pin ( 45 ), whereby a firm, electrical connection of the collecting section ( 54 ) of the battery connection terminals ( 50 ) with the positive or the negative conductor pin ( 44 . 45 ) of the electrode structure ( 40 ) takes place by the clamping opening ( 64 ) is reduced. Secondary lithium battery according to claim 1, characterized in that the connecting portion ( 31 ) of the center rod ( 30 ) is designed as a plug hole, while the connecting portion ( 51 ) of the battery connection terminals ( 50 ) Is designed as a plug-in pin, resulting in a plug connection by inserting the plug-in pin in the respective plug bores. Secondary lithium battery according to claim 1, characterized in that the clamping band ( 61 ) and a rotary knob ( 62 ) through the mounting frame ( 63 ) of the clamping units ( 60 ) are passed, wherein the knob ( 62 ) at its periphery with an external thread ( 621 ) which engages the toothed grooves ( 611 ) of the clamping band ( 61 ), whereby the clamping opening ( 64 ) of the clamping band ( 61 ) by turning the knob ( 62 ) is reducible.

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