CN204303901U - Battery pole ear syndeton and comprise the flexible-packed battery module of this syndeton - Google Patents

Abstract

The utility model belongs to technical field of lithium ion, in particular to a kind of battery pole ear syndeton, comprise at least two batteries, be arranged at the central dividing plate between two adjacent cell and be installed on the aluminium intercell connector of central dividing plate, the top of central dividing plate is provided with draw-in groove, aluminium base is arranged with in draw-in groove, the battery pole ear of central dividing plate both sides is stacked in the upper surface of aluminium base to the direction bending of aluminium base, aluminium intercell connector compresses battery pole ear after snapping in draw-in groove, and battery pole ear welds with aluminium intercell connector.Said structure ensure that aluminium base and battery pole ear surfacing laminating, make aluminium base when post laser welds for providing security protection bottom lug, the more important thing is that this structural insulation performance is good, electrical connection is reliable, be well suited for being arranged in flexible-packed battery module.In addition, the invention also discloses a kind of flexible-packed battery module comprising above-mentioned battery pole ear syndeton.

Description

Battery tab connection structure and soft package battery module including the connection structure

technical field

The utility model belongs to the technical field of lithium ion batteries, in particular to a battery tab connection structure and a soft package battery module comprising the connection structure.

technical background

At present, environmental and energy issues have made social progress face a severe situation, and low-carbon environmental protection has become a major theme of future economic development. Energy storage and efficient utilization have attracted attention from all aspects. Lithium-ion batteries exist as the smallest unit of energy storage. Battery modules are a structural form that effectively connects lithium-ion batteries, providing effective connections and reliable Fix the structure and connect the batteries in series to form a group. By connecting the batteries in series to increase the working voltage or in parallel to increase the total energy to supply power for electrical equipment, the battery module has become the main component and key technology in the field of energy storage today.

However, the actual work of the battery module is complicated. For example, when it is applied to an electric vehicle, the module needs to provide sufficient structural strength due to problems such as vibration during driving; at the same time, due to the compact body of the electric vehicle, the space envelope Therefore, the module needs to achieve a structure with small volume and large energy storage; when used in a large energy storage cabinet, it is also necessary to provide a structural form that can effectively connect batteries in series and fix them, while achieving reliable electrical connections .

The battery pack\electric cabinet generally consists of a certain number of batteries connected to each other in a specific form to form a battery module, and then according to different applications, a certain number of battery modules are fixedly connected in the battery pack\electric cabinet for work. The unit provides power or stores energy. At present, most pouch battery module batteries are connected in series with bolts and conductive metal strips. During the assembly process, rework is caused due to operational errors and other reasons, and when the assembly torque is too large, the phenomenon of battery thread slippage is prone to occur, resulting in battery failure. However, under complex dynamic load conditions, such as when electric vehicles vibrate during driving, there will be risks of bolts falling off, battery short circuit and connection bar failure; in addition, a small number of adjacent battery poles are connected in series by contact. The method of using ears not only occupies space for operation, but also cannot achieve reliable electrical connection in harsh environments such as vehicle vibration, resulting in large changes in contact resistance and affecting the use effect. At the same time, the arrangement of battery modules inside the battery pack\electric cabinet is tense, making it difficult to achieve effective cooling. The temperature of the battery rises under complex working conditions and cannot effectively dissipate heat. Security risks.

Thirdly, due to the limited space of battery packs and electric cabinets, the internal batteries of different battery packs are fixed in different ways, and the batteries have various layouts such as horizontal lying and vertical placement, resulting in various connections between batteries, which are not easy to insulate and protect , there is a risk of short circuit, and considering the electromagnetic interference problem is not conducive to the arrangement of low-voltage control lines.

Utility model content

One of the purposes of the utility model is to provide a battery lug connection structure with firm connection, good insulation performance and reliable electrical connection in view of the deficiencies in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical solution: a battery lug connection structure, including at least two batteries, an intermediate partition arranged between two adjacent batteries, and an aluminum alloy mounted on the intermediate partition. The connecting strip, the top of the intermediate partition is provided with a card slot, and the aluminum substrate is clamped in the card slot, and the battery tabs on both sides of the intermediate partition are bent toward the direction of the aluminum substrate and stacked on the On the upper surface of the aluminum substrate, the aluminum connection bar is clamped into the slot and pressed against the battery tab, and the battery tab is welded to the aluminum connection bar.

Compared with the prior art, the beneficial effect of the battery lug connection structure described in the present utility model is that the above-mentioned structure ensures that the surface of the aluminum substrate and the battery lug is flat and bonded, so that the aluminum substrate is the bottom of the tab during subsequent laser welding. Provide safety protection to prevent excessive laser welding power from melting through the middle partition and damaging the pouch battery. At the same time, since the aluminum connecting strip is inserted into the slot and then presses the battery tabs, it effectively solves the problem that the contact surface of adjacent battery tabs is uneven and the gap between the tabs is too large to be welded. During laser welding, the laser beam Centered and continuous welding along the length of the aluminum connection strip penetrates through multiple layers of metal to achieve reliable electrical connection.

As an improvement of the battery tab connection structure described in the present invention, the tabs of the battery on both sides of the middle partition are bent at 90 degrees toward the direction of the aluminum substrate and stacked on the aluminum substrate. surface. The 90-degree bending makes the surface of the aluminum substrate and the battery tab more flat, which provides a guarantee for the subsequent welding work.

As an improvement of the battery lug connection structure described in the present invention, the middle partition includes a middle partition body, a groove opened in the middle partition body, a rectangular groove through front and back, and a The convex line on the top of the intermediate partition body, and the pre-positioning bosses and pre-positioning grooves arranged at both ends of the top of the intermediate partition body.

Wherein, the groove is used for accommodating the battery, and it is fixed inside the groove by a solid double-sided adhesive tape, which can effectively protect the corners of the pouch battery. Since the pouch battery will bulge to a certain extent under normal use, the rectangular slot is set as a front-to-back through structure, which can leave space for the battery bulge; at the same time, it also takes into account the heat dissipation of the module under normal use problem, leave channels for cooling air. The protruding strips effectively isolate the aluminum connection strips and provide effective insulation protection for the battery grouping process. Specifically, since the positive and negative electrodes of two adjacent batteries are very close to each other during assembly, after one side is insulated, there will be no short circuit caused by the positive and negative electrodes of the two batteries being connected into a circuit. Since two adjacent intermediate partitions are assembled alternately, the pre-positioning bosses and pre-positioning grooves between adjacent intermediate partitions are connected to each other, which facilitates positioning and simplifies the assembly process. At the same time, in the later working process of the module In , when the soft bag module is stressed or vibrated, the structure here strengthens the interaction between the adjacent partitions.

As an improvement of the battery lug connection structure described in the present invention, one end of the protruding strip is provided with a strand beam, and a wiring groove is formed between the strand beam and the middle partition body. The strand beam provides a wiring channel for the sampling wire harness, and the sampling wire harness can be arranged to the end partition on one side of the module along the wiring groove.

Another object of the present utility model is to provide a flexible package battery module, including the above-mentioned battery lug connection structure, end separators, aluminum end plates, top fixing bar assembly, bottom fixing bar assembly, module upper cover, signal Wire harness and copper connecting sheet assembly, the end separator is arranged between the battery and the aluminum end plate, the top fixing bar assembly, the bottom fixing bar assembly and the upper cover of the module are all connected to the battery The tab connection structure is assembled, the signal wire harness is connected to all the batteries, and the copper connecting sheet assembly is welded to the batteries at the end.

Compared with the prior art, the beneficial effect of the flexible package battery module of the present utility model lies in that the structure of the above-mentioned battery module is compact, the assembly is convenient, and an effective cooling channel and electrical connection are provided, which is conducive to mass production, so that the battery can be used in Working at the optimal temperature under different working conditions, effectively prolonging the service life of the battery, while reducing the risk of battery runaway in the event of heat accumulation.

As an improvement of the flexible package battery module described in the present invention, solid double-sided adhesive tape. The solid double-sided adhesive tape realizes the effective fixing between the battery and the intermediate partition, the battery and the end partition, and the end partition and the aluminum end plate, thereby improving the structural strength of the module.

As an improvement of the flexible package battery module described in the present utility model, the top fixing strip assembly includes a top fixing strip and a first insulating gasket, and the top fixing strip and the first insulating gasket are connected by buckling. connected, or the top fixing bar and the first insulating spacer are integrally connected; the bottom fixing bar assembly includes a bottom fixing bar and a second insulating spacer, and the bottom fixing bar and the second insulating spacer The pads are connected by buckling, or the bottom fixing strip and the second insulating pad are connected by integral molding. The top fixing bar assembly and the bottom fixing bar assembly realize the fixing of all batteries, intermediate partitions and end partitions, and are fixed to the aluminum end plates by bolts at both ends.

As an improvement of the flexible package battery module described in the present invention, the upper cover of the module includes a main body of the upper cover, connecting parts arranged on both sides of the main body of the upper cover, and two other parts arranged on the main body of the upper cover. Side holes and grooves, and two connecting parts are provided with round waist holes. The upper cover of the module is made of plastic, which is low in cost and light in weight; the upper cover of the module is fixed through the round hole and bolts, so as to prevent the external conductive metal of the module from contacting the battery tab.

As an improvement of the flexible package battery module described in the present invention, the signal wire harness is connected to the aluminum connection bar, and one end of the signal wire harness is connected to an electrical connector. First, the signal wiring harness realizes real-time sampling of the voltage and temperature of the module, and monitors the working voltage of the battery at the same time to detect abnormalities in time, effectively and timely adjust the control strategy to balance the voltage of each battery, prolong the service life of the module, and ensure the working performance of the module. Thirdly, the signal wiring harness is integrated on the battery module, the signal detection is reliable, no additional parts for sampling and equalization are needed, and it is easy to connect with the control unit.

As an improvement of the flexible package battery module described in the present invention, the copper connecting sheet assembly includes a copper plate and a pressure riveting screw fixedly connected with the copper plate, and the copper plate is clamped with the end partition. The copper connection sheet assembly is ultrasonically welded on the terminal battery tab to ensure reliable electrical connection between the battery and the copper connection sheet, and the surface of the copper material is plated with silver to ensure effective electrical connection between the screws on the copper connection sheet assembly and other modules. touch.

Description of drawings

FIG. 1 is a partial structural cross-sectional view of an intermediate partition in Embodiment 1. FIG.

FIG. 2 is a schematic structural view of Embodiment 1.

Fig. 3 is a schematic structural view of the intermediate partition in Embodiment 1.

Fig. 4 is a schematic structural diagram of Embodiment 2.

Fig. 5 is an exploded schematic view of Embodiment 2.

FIG. 6 is a schematic structural view of the battery, end separators and aluminum end plates in Embodiment 2. FIG.

Fig. 7 is a schematic structural view of an aluminum end plate in Embodiment 2.

Fig. 8 is a schematic structural view of the upper cover of the module in Embodiment 2.

Among them, 1-battery, 2-intermediate partition, 3-aluminum connecting strip, 4-aluminum base plate, 5-end partition, 6-aluminum end plate, 7-top fixing bar assembly, 8-bottom fixing bar assembly, 9-Module upper cover, 10-Signal harness, 11-Battery tab, 12-Copper connector assembly, 13-Electrical connector, 14-Solid double-sided tape, 21-Card slot, 22-Intermediate partition body , 23-groove, 24-rectangular groove, 25-protruding strip, 26-pre-positioning boss, 27-pre-positioning groove, 51-fixing hole, 61-via hole, 62-round hole, 71-top fixing bar , 72-first insulating gasket, 81-bottom fixing strip, 82-second insulating gasket, 91-top cover body, 92-connecting part, 93-hole, 94-groove, 921-round waist hole, 121- Copper plate, 122-pressure riveting screws.

Detailed ways

The utility model will be further described in detail below in conjunction with the specific implementation and the accompanying drawings, but the implementation of the utility model is not limited thereto.

Specific embodiment 1, as shown in Figures 1 to 3, a battery tab connection structure, including at least two batteries 1, an intermediate partition 2 arranged between two adjacent batteries 1, and an intermediate partition 2 installed on the intermediate partition 2 Aluminum connecting strip 3, the top of the middle partition 2 is provided with a slot 21, and the aluminum substrate 4 is stuck in the slot 21, and the battery tabs 11 on both sides of the middle partition 2 are bent toward the direction of the aluminum substrate 4 and stacked on the On the upper surface of the aluminum substrate 4 , the aluminum connection bar 3 is snapped into the slot 21 and pressed against the battery tab 11 , and the battery tab 11 is welded to the aluminum connection bar 3 .

Preferably, the battery tabs 11 on both sides of the intermediate partition 2 are bent 90 degrees toward the aluminum substrate 4 and stacked on the upper surface of the aluminum substrate 4 , ensuring that the battery tabs 11 and the surface of the aluminum substrate 4 are evenly bonded. The middle partition 2 includes a middle partition body 22, a groove 23 provided in the middle partition body 22, a rectangular groove 24 through front and back, a raised bar 25 arranged on the top of the middle partition body 22, and a groove 23 arranged on the middle partition body. 22 pre-positioning bosses 26 and pre-positioning grooves 27 at both ends of the top. The number of intermediate partitions 2 is set to be multiple, and multiple intermediate partitions 2 are arranged crosswise (that is, positive and negative alternately arranged), so as to realize the series connection between batteries 1. Therefore, the middle partition 2 in Fig. 2 It has a "T" shape structure. One end of the protruding strip 25 is provided with a strand beam 251 , and a wiring groove 252 is formed on the strand beam 251 and the middle partition body 22 .

Embodiment 2, as shown in Figures 1 to 8, a flexible package battery module, including the battery lug connection structure of Embodiment 1, end separators 5, aluminum end plates 6, top fixing bar assembly 7, bottom The fixed bar assembly 8, the module upper cover 9, the signal wire harness 10 and the copper connection piece assembly 12, the end partition plate 5 is arranged between the battery 1 and the aluminum end plate 6, the top fixed bar assembly 7, the bottom fixed bar assembly 8 and The upper cover 9 of the module is assembled with the connection structure of the battery tabs 11 , the signal harness 10 is connected to all the batteries 1 , and the copper connection sheet assembly 12 is welded to the batteries 1 at the end.

Among them, the end separator 5 realizes the insulation between the battery 1 and the aluminum end plate 6 at both ends of the module, ensures the effective isolation of the pole of the battery 1 and the aluminum end plate 6, provides a safe creepage distance, and can be used as an end battery 1, it is important to fix the output copper connection bar assembly of the module, and at the same time leave a channel for the cooling of the battery 1. The aluminum end plate 6 is used to fix the module, and is connected with the top fixing bar assembly 7 and the bottom fixing bar assembly 8 by bolts to fix the middle partition 2 and the end partition 5, thereby realizing the purpose of fixing the battery 1 . The structure of the aluminum end plate 6 is designed with a through hole 61 up and down, which is mainly used for fixing the module in the battery pack\electric cabinet, and a round hole 62 is opened on the side to facilitate the use of fixtures during the assembly process. What is important is that the parts of the aluminum end plate 6 are made of aluminum material, which is light in weight, cheap in price, and easy to process.

Preferably, a solid double-sided adhesive tape is pasted on the surfaces where the battery 1, the middle partition plate 2, the end partition plate 5 and the aluminum end plate 6 are attached to each other, so as to realize the separation between the battery 1 and the middle partition plate 2, and between the battery 1 and the end portions. The effective fixing between the plate 5 and the end partition plate 5 and the aluminum end plate 6 improves the structural strength of the module. In addition, the battery 1, the middle partition 2, the end partition 5 and the aluminum end plate 6 are put into the fixture in a certain order, and the assembly round hole 62 of the aluminum end plate 6 is positioned on the fixture, and then a certain action is applied. The force makes the above parts compress each other to reach the design size.

Preferably, the top fixing bar assembly 7 includes a top fixing bar 71 and a first insulating washer, and the top fixing bar 71 and the first insulating washer 72 are connected by a buckle, or the top fixing bar 71 and the first insulating washer 72 are connected by One-piece connection; the bottom fixing bar assembly 8 includes a bottom fixing bar 81 and a second insulating pad 82, and the bottom fixing bar 81 and the second insulating pad 82 are connected by a buckle, or the bottom fixing bar 81 and the second insulating pad The pieces 82 are connected by one-piece molding. The top fixing bar assembly 7 and the bottom fixing bar assembly 8 can be buckled in and fixed around the aluminum end plate 6 in four directions, so that all parts of the module are tightly hugged and the overall structural strength is enhanced.

Preferably, the module upper cover 9 includes an upper cover body 91, connecting parts 92 arranged on both sides of the upper cover body 91, and holes 93 and grooves 94 arranged on the other two sides of the upper cover body 91, and the holes 93 serve as modules. The channel connected between the grooves 94 is used as the outlet of the low-voltage wire harness. The two connecting parts 92 are both provided with round waist holes 921 , the number of round waist holes 921 is eight, and every group of four is evenly distributed on the two connecting parts 92 . The module upper cover 9 is fixed on the soft bag module through the tight fit of the pressure riveting screws and the nuts on the top fixing bar assembly 7 .

Preferably, the signal wire harness 10 includes a sampling line (not shown in the figure) and an equalization line (not shown in the figure), and the sampling line and the equalization line are welded in sequence on the aluminum connection bar 3, and then one end of the signal wire harness 10 is connected to the electrical socket 13, and finally form the wire harness assembly. The signal wire harness 10 is fixed with the fixing hole 51 of the end partition 5 through the cable tie, and is led to the outer end of the module. The fixing of the cable tie can effectively prevent the signal wire harness 10 from falling off from the aluminum connecting piece when the signal wire harness 10 is subjected to external force, thereby effectively It ensures the laser penetration welding from top to bottom at the designated position on the aluminum connecting strip 3 of the soft package module, and realizes reliable electrical connection between all batteries 1. Compared with the existing technology, laser welding has more advantages than bolt connection. The smaller the resistance, the stronger the connection.

Preferably, the copper connection sheet assembly 12 includes a copper plate 121 and a pressure riveting screw 122 fixedly connected with the copper plate 121 , and the copper plate 121 is clamped with the end partition 5 . The battery 1 at the end position is integrated with the copper connecting sheet assembly 12 by ultrasonic welding in advance according to the design position requirements. When assembling, the copper connecting sheet assembly 12 is snapped into the slot of the end partition 5 from one side to realize the copper connection. At the same time, the end partition plate 5 effectively insulates the copper connection sheet assembly 12 from the aluminum end plate 6, thereby realizing safety protection.

It is foreseeable that the battery lug connection structure of Embodiment 1 can be applied not only to soft-pack lithium battery packs, but also to series-parallel connections of nickel-hydrogen and nickel-cadmium batteries.

According to the disclosure and teaching of the above specification, those skilled in the art to which the present utility model belongs can also change and modify the above embodiment. Therefore, the utility model is not limited to the above specific implementation manners, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the utility model shall belong to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present utility model.

Claims (10)

1. a battery pole ear syndeton, it is characterized in that: comprise at least two batteries, be arranged at the central dividing plate between two adjacent cell and be installed on the aluminium intercell connector of described central dividing plate, the top of described central dividing plate is provided with draw-in groove, aluminium base is arranged with in described draw-in groove, the battery pole ear of described central dividing plate both sides is stacked in the upper surface of described aluminium base to the direction bending of described aluminium base, compress described battery pole ear after described aluminium intercell connector snaps in described draw-in groove, and described battery pole ear welds with described aluminium intercell connector.

2. battery pole ear syndeton according to claim 1, is characterized in that: the lug of the described battery of described central dividing plate both sides is stacked in the upper surface of described aluminium base to the direction bending 90 degree of described aluminium base.

3. battery pole ear syndeton according to claim 1, is characterized in that: the rectangular channel that described central dividing plate comprises central dividing plate body, is opened in the groove of described central dividing plate body, front and back are through, be arranged at the raised line of described central dividing plate bodies top and be arranged at pre-determined bit boss and the pre-determined bit groove at described central dividing plate bodies top two ends.

4. battery pole ear syndeton according to claim 3, is characterized in that: one end of described raised line is provided with stock position crossbeam, and described stock position crossbeam and described central dividing plate body are formed with wiring groove.

5. a flexible-packed battery module, it is characterized in that: comprise the battery pole ear syndeton described in claim 1 ~ 4 any one, end bulkheads, aluminium end plate, top fixed strip assembly, bottom fixed strip assembly, module upper cover, signal wire harness and copper connecting sheet components, described end bulkheads is arranged between described battery and described aluminium end plate, described top fixed strip assembly, described bottom fixed strip assembly and module upper cover all assemble with described battery pole ear syndeton, described signal wire harness is communicated with all batteries, described copper connecting sheet components and the welding battery being positioned at end.

6. flexible-packed battery module according to claim 5, is characterized in that: the face that described battery, described central dividing plate, described end bulkheads and described aluminium end plate are bonded to each other is all pasted with solid double faced adhesive tape band.

7. flexible-packed battery module according to claim 5, it is characterized in that: described top fixed strip assembly comprises top fixed strip and the first insulation spacer, described top fixed strip is connected by snap fit with described first insulation spacer, or described top fixed strip is connected by one-body molded mode with described first insulation spacer; Described bottom fixed strip assembly comprises bottom fixed strip and the second insulation spacer, and described bottom fixed strip is connected by snap fit with described second insulation spacer, or described bottom fixed strip is connected by one-body molded mode with described second insulation spacer.

8. flexible-packed battery module according to claim 5, it is characterized in that: described module upper cover comprises upper cover body, be arranged at the connecting portion of described upper cover body both sides and be arranged at hole and the groove of the described other both sides of upper cover body, and two described connecting portions are provided with round waist hole.

9. flexible-packed battery module according to claim 5, is characterized in that: described signal wire harness is connected with described aluminium intercell connector, and one end of described signal wire harness is connected with electrical connector.

10. flexible-packed battery module according to claim 5, is characterized in that: described copper connecting sheet components comprises copper coin and is fixedly connected with self-clinching stud with described copper coin, described copper coin and described end bulkheads clamping.