CN216145743U

CN216145743U - Series connection structure of battery

Info

Publication number: CN216145743U
Application number: CN202122039848.3U
Authority: CN
Inventors: 于前锋; 王昆; 黄国强
Original assignee: Hefei Haixiong Energy Technology Co ltd
Current assignee: Hefei Haixiong Energy Technology Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2022-03-29
Anticipated expiration: 2031-08-26

Abstract

The utility model discloses a series connection structure of a battery in the field of battery connection, which comprises a plurality of stacked battery cells, wherein a first lug and a second lug with opposite polarities are arranged on the same side of each battery cell, and the first lug and the second lug are both bent outwards along the stacking direction of the battery cells to form a Z shape; close first utmost point ear and the laminating contact of second utmost point ear in two adjacent electric cores and fixed through anchor clamps elasticity centre gripping. The utility model adopts the elastic clamping of the clamp to replace the fastening of the bolt, the tab only needs to be bent, the processing procedure is simple, the disassembly is convenient and rapid, the stress of the tab is more uniform by using the clamp, the tab can be fully contacted, the contact resistance is small, and compared with the prior art, the utility model is easier to be applied in factories.

Description

Series connection structure of battery

Technical Field

The utility model relates to the field of battery connection, in particular to a series connection structure of batteries.

Background

The high-capacity lithium battery cell has the advantages of easy modularization and easy management, and compared with the low-capacity cell after modularization, the high-capacity lithium battery cell has higher energy density and is favored in power batteries and energy storage industries. However, the corresponding high-capacity battery cell groups are basically mainly connected in series, the battery cells with smaller circuit current-carrying capacity are much higher under the same multiplying power, the overcurrent cross section area needs to be fully considered to meet the requirement of current-carrying capacity when the tab is designed, and the tab of the high-capacity battery cell is usually designed into a pole piece form by combining the structure and the use characteristics of the battery cell.

The connection quality of the pole lugs of the high-capacity battery cores in a grouping process influences the subsequent operation efficiency of the system. The pole piece type pole lug is welded by the traditional welding process, the lug connecting area is large for a large-capacity battery, the probability of insufficient soldering is increased due to more welding spots except for difficult welding, and the contact resistance is large. Meanwhile, the difficulty in disassembling the electric core is high when the electric core is in a problem in the subsequent use process, the electrode lug of the non-fault electric core is easy to damage, and the maintenance cost is increased. The existing screw connection process is complicated in procedure, high in requirement on machining precision and not beneficial to modularization implementation.

Chinese patent CN208225955U discloses a large-scale parallel-connection-free lithium ion battery module assembly structure, which uses a bolt fastening press to connect tabs, but needs a series of processes such as upper clamp punching, lower press punching tapping, tab shaping, cutting, punching and bending, and has complex processing procedures and high precision requirement. Meanwhile, in order to meet the requirement of bolt fastening strength, the lower pressing tool needs to be designed to be thicker, and the mass energy density of the battery pack is reduced.

Chinese patent CN207690895U discloses a single-string lithium battery tab series structure, which can adopt a clamping seat and a buckle to mutually clamp, and connect and fix the tabs. But the structure of cassette, buckle is comparatively complicated, and the cost of manufacture is high, and is bulky moreover, needs great installation space.

The two manufacturing and mounting processes are complicated and more in material consumption, so that the energy density of the battery pack is reduced, and the material consumption and labor cost are increased; on the other hand, both of them need to open the pole ears additionally, which is not favorable for secondary utilization of the battery. In view of the above problems, the applicant proposed a serial connection structure of batteries.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a series connection structure of batteries to solve the above problems.

In order to achieve the purpose, the utility model provides the following technical scheme:

a series connection structure of a battery comprises a plurality of stacked battery cells, wherein a first lug and a second lug with opposite polarities are arranged on the same side of each battery cell, and the first lug and the second lug are both bent outwards along the stacking direction of the battery cells to form a Z shape; close first utmost point ear and the laminating contact of second utmost point ear in two adjacent electric cores and fixed through anchor clamps elasticity centre gripping.

In some embodiments, the clamp includes two pressing plates, the two pressing plates are respectively disposed on upper and lower sides of a first tab and a second tab of the two battery cells, and are jointly embedded into the U-shaped card and elastically clamped and fixed by two ends of the U-shaped card.

In some embodiments, the platen is a thermally and electrically conductive material.

In some embodiments, the bolt is in the form of a full thread self-locking.

In some embodiments, the clamp includes a first arc part and a second arc part, both ends of the first arc part and the second arc part are integrally connected and wound into a spiral structure, and a first tab and a second tab of two battery cells in fitting contact are arranged between the first arc part and the second arc part and are clamped and fixed by the first arc part and the second arc part.

In some embodiments, a hole is formed in the center of the spiral structure, the inner sides of the first tab and the second tab which are in contact with each other in the battery cell laminating mode penetrate through a limiting plate along the length direction of the tabs, limiting holes are formed in two ends of the limiting plate, a cylindrical split pin is inserted into the hole from the hole to the limiting hole, and a limiting stop is arranged at the tail end of the cylindrical split pin to maintain the pressing and fixing state of the clamp and the limiting plate.

In some embodiments, the limiting plate is an electrically conductive material.

In some embodiments, the first tab and the second tab of a single cell are arranged in a staggered manner perpendicular to the cell stacking direction and are centrosymmetric.

Has the advantages that: the utility model adopts the elastic clamping of the clamp to replace the fastening of the bolt, the tab only needs to be bent, the processing procedure is simple, the disassembly is convenient and rapid, the stress of the tab is more uniform by using the clamp, the tab can be fully contacted, the contact resistance is small, and compared with the prior art, the utility model is easier to be applied in factories.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is a schematic structural view of a jig according to embodiment 2 of the present invention;

FIG. 4 is a schematic structural view of a cylindrical cotter pin according to embodiment 2 of the present invention;

fig. 5 is a schematic structural view of a limiting plate according to embodiment 2 of the present invention.

In the figure: 1-electric core; 201-a first tab; 202-a second tab; 3, clamping; 301-upper platen; 302-a lower platen; 4-U type card; 5-bolt; 601-a first arcuate portion; 602-a second arcuate portion; 603-a helical structure; 604-holes; 7-a limiting plate; 8-a limiting hole; 9-cylindrical cotter pin; 10-limit stop.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

A series connection structure of a battery comprises a plurality of battery cells 1, as shown in fig. 1, four battery cells 1 are stacked up and down in a flush manner, and the four battery cells are sequentially called as No. 1-4 battery cells from top to bottom. The same side of each battery cell 1 has a first tab 201 and a second tab 202 with opposite polarities, for example, the first tab 201 has a positive polarity, and the second tab 202 has a negative polarity.

First utmost point ear 201 and second utmost point ear 202 all are bent along electric core 1 and are the Z type to the outside side of piling up the direction. Since the cells are stacked up and down in the present embodiment, the "outer side" herein refers to the upper and lower sides of the horizontal central plane of the cell 1. The battery cells 1 need to be connected in series, and the positive electrode and the negative electrode need to be connected in sequence, so as to connect two adjacent battery cells 1, and to limit the bending directions of the first tab 201 and the second tab 202 on the battery cells 1 to be opposite.

The first tab 201 and the second tab 202 in a single battery cell 1 may be arranged in an up-down symmetrical manner, but this may result in the unchanged operation when the tabs of two battery cells are connected, so as to be a preferred embodiment, the first tab 201 and the second tab 202 of a single battery cell 1 are arranged in a staggered manner perpendicular to the stacking direction of the battery cells 1, and are in central symmetry.

For example, the first tab 201 faces upward in the No. 1 battery cell, the second tab 202 faces downward, the first tab 201 in the No. 2 battery cell needs to be connected and contacted with the second tab 202 in the No. 1 battery cell, and then the No. 2 battery cell is turned over relative to the No. 1 battery cell, so that the second tab 202 and the first tab 202 face downward. Similarly, the first tab 201 of No. 3 electric core is in contact with the second tab 202 of No. 2 electric core, and the second tab 202 is in contact with the first tab 201 of No. 4 electric core, and then the order of putting of No. 3 electric core is the same as No. 1 electric core, and the order of putting of No. 4 electric core is the same as No. 2 electric core, thereby realizing the close contact of the first tab 201 and the second tab 202 in two adjacent electric cores 1. The first tab 201 and the second tab 202 which are in contact with each other in the fitting manner of the two battery cells 1 are elastically clamped and fixed by the clamp 3.

In embodiment 1, the jig 3 includes two pressing plates, which are referred to as an upper pressing plate 301 and a lower pressing plate 302, respectively. In order to facilitate processing and manufacturing, the pressing plate can be made of a heat conduction and electric conduction material which is regular in size and does not need punching and tapping, and is preferably a long-strip-shaped metal strip, so that the pressing plate has certain strength and can protect the lugs.

The upper pressing plate 301 and the lower pressing plate 302 are respectively arranged on the upper side and the lower side of the first tab 201 and the second tab 202 which are in contact with each other, and are jointly embedded into the opening of the U-shaped card 4. The U-shaped card 4 is preferably made of steel and has certain elasticity, so that the pressing plate can be elastically clamped by two ends of the U-shaped card. Further, a screw hole and a bolt 5 are arranged on the U-shaped clamp, the bolt 5 is locked, and after the pressing plate is pressed tightly by the elasticity of the U-shaped clamp, the first pole lug 201 and the second pole lug 202 are firmly connected. Preferably, the bolt 5 is the preferred full thread self-locking form, and screw thread length guarantees to be in full contact with the U type card after screwing, and the self-locking structure can guarantee can not should shake the in-process in the operation reason pine and take off.

This embodiment adopts U type card 4 to replace the bolt-up to exert pressure to upper and lower clamp plate, and the size rule of clamp plate, the preparation is convenient, low cost, utmost point ear only need bend the processing can, manufacturing process is simple and do not have too high requirement to clamp plate material and thickness. And disassemble convenient and fast, use U type card 4 to make the clamp plate atress more even, the clamp plate non-deformable, can fully contact between the utmost point ear, contact resistance is little, implements the application in the mill for prior art more easily.

Embodiment 2, as shown in fig. 2-3, the clamp is made by winding an elastic metal material, and includes a first arcuate portion 601 and a second arcuate portion 602, two ends of the first arcuate portion 601 and the second arcuate portion 602 are integrally connected and symmetrically wound into a spiral structure 603, and a hole 604 is naturally formed in the center of the spiral structure 603. The first and second

arcuate portions

601 and 602 are wavy, and the amplitude of the first arcuate portion 601 is larger and the amplitude of the second arcuate portion 602 is smaller. Under the non-stressed condition, the first arch part 601 is in contact with and closed to the downward bending part of the second arch part 602, and at least three pressing contact points exist, and the upward bending parts of the first arch part 601 and the second arch part 602 are in an open state.

During installation, the first bow-shaped part 601 and the second bow-shaped part 602 are opened up and down by force, the first tab 201 and the second tab 202 which are in contact with the two battery cells 1 are arranged in a gap opened between the first bow-shaped part 601 and the second bow-shaped part 602, at the moment, the spiral structure deforms to generate elastic stress, and the elastic stress counteracts the first bow-shaped part 601 and the second bow-shaped part 602 to enable the first tab 201 and the second tab 202 to be pressed and clamped.

In order to limit and fix the clamp 3, the clamp 3 is connected with the pole lug more tightly. The inner sides of the first tab 201 and the second tab 202 of the two battery cells 1 penetrate through the limiting plate 7 along the length direction of the tabs, as shown in fig. 5, and the two ends of the limiting plate 7 are provided with limiting holes 8. The position of the limiting hole 8 corresponds to the position of the hole 604. The cylindrical cotter pin 9 is inserted into the hole 604 to the limit hole 8 in sequence, as shown in fig. 4, the end of the cylindrical cotter pin 9 is provided with a limit stop 10, and the external dimension when the limit stop 10 is separated is larger than the aperture of the limit hole 8, so that the limit effect can be generated. When the limit stopper 10 is closed, the outer dimension thereof is smaller than the aperture of the limit hole 8, and at this time, the limit stopper can pass through the limit hole 8.

The distance between the limit stop 10 and the head end of the cylindrical cotter pin 9 is the effective locking length. Because the effective locking length of the cylindrical cotter pin 9 is smaller than the distance between the hole 604 and the limiting hole 8 in the normal state, when the limit stop 10 completely passes through the limiting hole 8 and enters the inner side of the limiting plate 7, the cylindrical cotter pin 9 reaches the complete limiting state, and the pressing and fixing state of the clamp 3 and the limiting plate 7 is maintained. At this time, the helical structure 603, the first arcuate portion 601 and the second arcuate portion 602 both generate corresponding bending deformation, and the mutual acting force formed by the bending deformation enables the clamp 3 and the tab to be tightly pressed together without generating relative displacement. Preferably, the limiting plate 7 is made of a conductive material, so that when the clamp 3 is in compression joint and limited, the current conduction between the first tab 201 and the second tab 202 can be realized through the limiting plate 7, and the current guiding effect is enhanced.

The abutting contact points of the first arc-shaped part 601 and the second arc-shaped part 602 and the tab are relatively dispersed, so that the clamp can be prevented from falling and being unbalanced under the action of elasticity, and the crimping stability is enhanced. In the complete limit state, the upward bending portion of the first arcuate portion 601 is continuously opened to form a torsional deformation relative to the initial unstressed state by the pressing force, and the first arcuate portion 601 and the second arcuate portion 602 are further clamped by the torsional force, so that the mutual pressing effect of the first tab 201 and the second tab 202 of the two battery cells 1 is enhanced.

When needs are dismantled, carry limit stop 10 through instruments such as clamp, when limit stop 10 folds back the diameter and is less than the aperture of spacing hole 8, cylinder split pin 9 relies on the elasticity of anchor clamps 3 to pop out from spacing hole 8 automatically, and the operation is swift convenient, easy to carry out.

The beneficial effects of this embodiment are as follows:

1. the traditional crimping modes of screwing and welding only cause one-dimensional binding force on the polar lug, namely, one-time protection, and when the layer of protection is lost, the binding force is lost. In the embodiment, the force is comprehensively applied in two dimensions, one is the self elastic force of the clamp 3, and the other is the extrusion force between the clamp 3 and the limiting plate 7, so that the first tab 201 and the second tab 202 and the two tabs and the limiting plate 7 are fully contacted, and the omnibearing crimping of the tabs is realized; meanwhile, under the complete limit state, mutual promotion action exists between the two forces, and the crimping effect is further enhanced.

2. First bow-shaped portion 601, the second bow-shaped portion 602 of anchor clamps 3 adopt wavy lines structure, compare with spiro union or other crimping modes, when having reduced subassembly weight, have guaranteed the crimping area, have improved crimping reliability, have reduced utmost point ear contact internal resistance.

3. The clamp force of anchor clamps 3 mainly relies on elasticity crimping spare deformation, and spacing stopper 10 who mainly relies on cylindrical cotter pin 9 is conventional physical structure, and is ripe reliable. Even in scenes such as vibrations, external effort can also be cleared up to anchor clamps 3 dependence deformation of self, the pine problem that takes off that the spiro union mode caused because of vibrations can not appear.

4. The structure is simple, the processing is convenient, and the rapid assembly can be realized without professional knowledge; meanwhile, irreversible processing damage to the lug is not required in the installation process, and secondary utilization of the battery cell is facilitated.

Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.

Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims

1. The tandem connection structure of the battery comprises a plurality of stacked battery cells (1), and is characterized in that the same side of each battery cell (1) is provided with a first tab (201) and a second tab (202) with opposite polarities, and the first tab (201) and the second tab (202) are both bent outwards along the stacking direction of the battery cells (1) to form a Z shape; a first tab (201) and a second tab (202) which are close to each other in two adjacent battery cells (1) are in contact with each other in a fitting manner and are elastically clamped and fixed through a clamp.

2. The series connection structure of the batteries according to claim 1, wherein the clamp comprises two pressing plates, the two pressing plates are respectively arranged at the upper and lower sides of the first tab (201) and the second tab (202) which are in contact with the two battery cores (1), and are jointly embedded into the U-shaped card (4) and elastically clamped and fixed by two ends of the U-shaped card (4).

3. The battery series connection structure according to claim 2, wherein the pressing plate is fixedly connected with the U-shaped clamp (4) through a bolt (5).

4. The tandem cell arrangement of claim 2, wherein said press plate is made of a thermally and electrically conductive material.

5. A battery tandem connection structure according to claim 3, wherein said bolt (5) is in the form of a full thread self-locking.

6. The series connection structure of the batteries according to claim 1, wherein the clamp comprises a first arch part (601) and a second arch part (602), both ends of the first arch part (601) and the second arch part (602) are integrally connected and wound into a spiral structure (603), and a first tab (201) and a second tab (202) of two battery cells (1) which are in fit contact are arranged between the first arch part (601) and the second arch part (602) and are clamped and fixed by the first arch part (601) and the second arch part (602).

7. The series connection structure of the batteries according to claim 6, wherein a hole (604) is formed in the center of the spiral structure (603), the inner sides of the first tab (201) and the second tab (202) which are in contact with each other in the two battery cells (1) pass through the limiting plate (7) along the length direction of the tabs, the two ends of the limiting plate (7) are provided with limiting holes (8), a cylindrical cotter pin (9) is inserted into the hole (604) to the limiting holes (8), and the tail end of the cylindrical cotter pin (9) is provided with a limiting stopper (10) to maintain the clamping and fixing states of the clamp (3) and the limiting plate (7).

8. The battery series connection structure according to claim 7, wherein the limiting plate (7) is made of a conductive material.

9. The series connection structure of the batteries according to claim 1 or 2, wherein the first tab (201) and the second tab (202) of the single battery cell (1) are arranged in a staggered manner perpendicular to the stacking direction of the battery cells (1) and are centrosymmetric.