CN204966571U - Battery connection piece structure and battery module - Google Patents

Abstract

The utility model discloses a battery connecting piece structure and a battery module. The battery connecting piece includes a plastic bracket and a busbar. The lower surface of the plastic bracket is provided with a plurality of grooves into which electric cores can be placed. The bottom of each groove is provided with a through hole. A lead-out piece is provided through the through hole. The busbar and the lead-out piece are both conductors. The lead-out piece includes a busbar end connected to the busbar, a cell end connected to a cell placed in the groove, and an overload fuse located between the busbar end and the cell end. The battery pack includes a plurality of cylindrical cells and two battery connecting pieces as above. Each cell is installed between the two battery connecting pieces in the same direction. The two ends of the cell are respectively embedded in the grooves of the two battery connecting pieces, and are respectively connected to the corresponding busbars through the lead-out piece. The battery module includes a plurality of cylindrical cells and two battery connecting piece structures as above. The utility model is reliable and practical in design. The "fuse" function is realized by setting the lead-out piece. The cell can be blown in time when the cell is abnormal, so as to avoid a series of thermal runaway reactions, thereby improving the reliability and safety of the battery pack.

Description

A battery connecting sheet structure and battery module

technical field

The utility model is used in the technical field of battery modules, in particular to a battery connecting sheet structure and a battery module.

Background technique

At present, due to its excellent performance, lithium-ion batteries are widely used in mobile digital, electric tools, backup power, electric bicycles, electric vehicles and other fields.

Taking an electric vehicle as an example, it requires multiple single cells to be connected in series or parallel to form a power battery module, and several power battery modules are connected in series or parallel to each other to form a power battery pack. However, the existing battery connectors are mostly connected to the battery cells by welding or locking screws, and there is no structural connection between the connectors and the battery plastic bracket. Under the relatively complicated operating conditions of electric vehicles, the vibration and impact on the battery pack will be transmitted to the welding points or screw locking points of the connecting piece. It is easy for the connecting piece to fall off, or the contact internal resistance is large, which may cause the danger of fire and explosion of the battery pack. At the same time, there is currently a lack of a connecting piece similar to a "fuse" function for each single battery cell, which makes it impossible to disconnect the circuit in time when a certain battery cell is abnormal, thus triggering a series of subsequent thermal runaway reactions.

Utility model content

In order to solve the above problems, the utility model provides a battery connector structure and a battery module, the design of which is reliable and practical, and has a "fuse" function, which improves the reliability and reliability of the battery pack under complex working conditions and abnormal battery cells. safety and facilitate mass production.

The technical solution adopted by the utility model to solve the technical problem is: a battery connection sheet structure, including a plastic bracket and a busbar arranged on the upper surface of the plastic bracket, and a number of power supply cores are provided on the lower surface of the plastic bracket. The bottom of each groove is provided with a through hole, and a lead-out piece is provided through the through-hole, and the bus piece and the lead-out piece are both conductors, and the lead-out piece includes a The confluence terminal, the cell terminal which can be connected with the cell inserted into the groove, and the overload fuse located between the confluence terminal and the cell terminal.

As a further improvement of the technical solution of the present utility model, the busbar is covered on the upper surface of the plastic bracket, and a through hole is provided on the busbar at the corresponding position of the plastic bracket through hole, and the busbar of the lead-out piece is controlled by the throughhole. After the hole is pierced, it is welded on the upper surface of the busbar.

As a further improvement of the technical solution of the present invention, the busbar is glued to the upper surface of the plastic bracket.

As a further improvement of the technical solution of the utility model, several glue grooves are provided on the upper surface of the plastic bracket, and the bus plate is bonded to the upper surface of the plastic bracket by epoxy resin glue provided in the glue grooves.

As a further improvement of the technical solution of the utility model, the upper surface of the plastic bracket is provided with reinforcing ribs protruding upwards on the edge of each via hole, and the reinforcing ribs pass through the through holes of the bus sheet, and the reinforcing ribs are provided with There is an avoidance card position for the lead-out piece to pass through.

As a further improvement of the technical solution of the utility model, one reinforcing rib is provided on the front edge and the rear edge of the via hole respectively, and an avoidance locking position is formed between the two reinforcing ribs on the left edge and the right edge of the via hole.

As a further improvement of the technical solution of the utility model, the lead-out sheet is a nickel sheet, the confluence end of the nickel sheet is connected to the upper surface of the bus sheet by resistance welding or laser welding, and the electric core end of the nickel sheet can be welded by resistance welding or laser welding. Connected to the electrodes of the battery cell.

As a further improvement of the technical solution of the utility model, the lead-out sheet is copper wire or aluminum wire, and the confluence end of the copper wire or aluminum wire is connected to the upper surface of the confluence sheet by ultrasonic welding, and the cell end of the copper wire or aluminum wire can be It is connected to the electrode of the cell by ultrasonic welding.

The utility model also provides a battery module, which includes several cylindrical cells and two battery connecting piece structures as described above, each of the battery cells is installed in the same direction between the two battery connecting piece structures, and the battery cells The two ends of the battery are respectively embedded in the grooves of the structure of the two battery connecting pieces, and are respectively connected to the corresponding bus pieces through the lead-out pieces.

Beneficial effects of the utility model: for lithium-ion battery packs, the reliability of the connecting piece is very important, which is directly related to the performance of the product and the safety of use. The battery connecting sheet structure provided by the utility model and the battery module formed by the battery connecting sheet structure are reliable and practical in design, and the "fuse" function is realized by setting the lead-out sheet that can be fused when overloaded, which can be used in time when the battery cell is abnormal. Fusing can avoid a series of thermal runaway reactions, improve the reliability and safety of battery packs under complex working conditions and abnormal conditions of battery cells, and facilitate mass production.

Description of drawings

Below in conjunction with accompanying drawing, the utility model is further described:

Fig. 1 is a structural schematic diagram of the battery connecting piece of the present invention;

Fig. 2 is a structural schematic diagram of the utility model plastic support;

Figure 3 is a schematic diagram of the connection between the electric core and the busbar when the lead-out sheet of the utility model is a nickel sheet;

Fig. 4 is a schematic diagram of the connection between the electric core and the busbar when the lead-out piece of the utility model is copper wire or aluminum wire;

Fig. 5 is a schematic diagram of the installation structure of the battery cells in the battery module in the utility model between the battery connecting sheet structures.

detailed description

Referring to Fig. 1 to Fig. 5, it has shown the concrete structure of the preferred embodiment of the present utility model. The structural features of each element of the present utility model will be described in detail below, and if there is a description to the direction (up, down, left, right, front and back), it is described with reference to the structure shown in Fig. 3 or Fig. 4, but The actual use direction of the utility model is not limited thereto.

Referring to Fig. 1 and Fig. 2, the utility model provides a battery connecting sheet structure, including a plastic bracket 1 and a busbar 2 arranged on the upper surface of the plastic bracket 1, and the busbar 2 covers the plastic bracket 1 The upper surface of the upper surface of the plastic bracket 1 is specifically provided with a number of glue grooves 11 on the upper surface of the plastic bracket 1. , wherein the epoxy resin adhesive has good bonding strength and short solidification time, and is attached between the plastic bracket 1 and the busbar 2 to play a reliable structural bonding role. In this way, the busbar 2 and the plastic bracket 1 are integrated to avoid the risk of the pull-to-weld joint due to vibration and impact. The lower surface of the plastic bracket 1 is provided with a plurality of grooves 12 that can be inserted into the power supply core 3, and the bottom of each groove 12 is provided with a through hole, and a lead piece 4 is provided through the through hole, and the confluence Both the sheet 2 and the lead-out sheet 4 are conductors, and the lead-out sheet 4 includes a bus terminal 41 connected to the bus bar 2, a battery terminal 42 that can be connected to the battery cell 3 inserted into the groove 12, and a battery terminal 42 that is located at the bus terminal 41 and the battery. An overload fuse 43 between the core ends 42 . A through hole 21 is provided on the bus piece 2 at a position corresponding to the through hole of the plastic bracket 1 , and the bus terminal 41 of the lead-out piece 4 passes through the through hole 21 and is welded on the upper surface of the bus piece 2 . The overload fuse 43 has the effect of automatically melting when the current is too large through its structural design (narrowing), thus playing the role of a "fuse", which can be blown in time when the battery cell 3 is abnormal, and avoid a series of thermal runaway reactions. .

The upper surface of the plastic bracket 1 is provided with reinforcing ribs 13 protruding upwards on the edge of each via hole, and the reinforcing ribs 13 pass through the through holes 21 of the busbar 2, and there are lead-out plates between the reinforcing ribs 13. 4 Passed avoidance card positions. The reinforcing ribs 13 are respectively arranged on the front edge and the rear edge of the via hole, and the two reinforcing ribs 13 form avoidance clamping positions on the left edge and the right edge of the via hole. The ribs 13 protect the lead-out sheet 4 during the handling of the battery pack, subsequent assembly and use.

Referring to Fig. 3, the lead-out sheet 4 can be selected from a nickel sheet, and the bus terminal 41 of the nickel sheet is connected to the upper surface of the bus sheet 2 by resistance welding or laser welding, and the cell end 42 of the nickel sheet can be connected by resistance welding or laser welding On the electrodes of the cell 3. The size of the overload fuse part 43 of the nickel sheet can be designed as required to meet the requirement of overcurrent protection.

Referring to Fig. 4, the lead-out sheet 4 can be selected from copper wire or aluminum wire, and the bus end 41 of the copper wire or aluminum wire is connected to the upper surface of the bus sheet 2 by ultrasonic welding, and the battery end 42 of the copper wire or aluminum wire can be passed through The electrodes of the electric core 3 are connected by ultrasonic welding. Among them, the cross-sectional size of the overload fuse of the thick copper/aluminum wire can be selected on demand to meet the needs of overcurrent protection.

Referring to Fig. 5, the utility model provides a battery module, including several cylindrical battery cells 3 and two battery connecting sheet structures as described above, each of the battery cells 3 is installed in the same direction on the two battery connection pieces. Between the sheet structures, the two ends of the battery cells are respectively embedded in the grooves 12 of the connecting sheet structures of the two batteries, and are respectively connected to the corresponding bus sheets through the lead-out sheets.

When assembling the battery module, first put the battery cell 3 into the groove 12 of the plastic bracket 1, the battery cell 3 and the plastic bracket 1 are installed firmly, and then apply epoxy glue evenly in the glue groove 11 of the plastic bracket 1 , and place the busbar 2 on the corresponding position of the plastic bracket 1, wait for 5 to 15 minutes, after the epoxy resin is solidified, the busbar 2 is bonded to the plastic bracket 1.

When the lead-out sheet 4 is a nickel sheet, resistance welding or laser welding can be used to complete the connection between the nickel sheet and the bus sheet 2, the nickel sheet and the electric core 3;

When the lead-out sheet 4 is a thick copper/aluminum wire, ultrasonic welding can be used to complete the connection between the thick copper/aluminum wire and the bus sheet 2 , and between the thick copper/aluminum wire and the battery core 3 .

Of course, the present invention is not limited to the above-mentioned embodiments. Those skilled in the art can also make equivalent modifications or replacements without violating the spirit of the present utility model. These equivalent modifications or replacements are all included in the claims of this application. within the limited range.

Claims (9)

1. a battery connecting wafer structure, it is characterized in that: comprise plastic rubber bracket and the sheet that confluxes being located at described plastic rubber bracket upper surface, the lower surface of described plastic rubber bracket offers some grooves of inserting for battery core, the bottom land of each described groove all offers via hole, lead-out tablet is provided with through described via hole, described sheet and the lead-out tablet of confluxing is conductor, described lead-out tablet comprise hold confluxing of being connected with the sheet that confluxes, the battery core end that can be connected with the battery core inserting groove and being positioned at confluxes and holds and overload fuse part between battery core end.

2. battery connecting wafer structure according to claim 1, it is characterized in that: described in the sheet that confluxes cover the upper surface of described plastic rubber bracket, conflux on sheet and be provided with through hole at the correspondence position of plastic rubber bracket via hole, after the end that confluxes of described lead-out tablet is passed by described through hole, be welded on the upper surface of the sheet that confluxes.

3. battery connecting wafer structure according to claim 2, is characterized in that: described in conflux sheet by the gluing upper surface being connected on described plastic rubber bracket.

4. battery connecting wafer structure according to claim 3, is characterized in that: the upper surface of described plastic rubber bracket is offered and somely beaten glue groove, described in the sheet that confluxes be bonded in the upper surface of described plastic rubber bracket by being located at the epoxide-resin glue beaten in glue groove.

5. the battery connecting wafer structure according to claim 2,3 or 4, it is characterized in that: the upper surface of described plastic rubber bracket is equipped with the reinforcement protruded upward at the edge of each via hole, described reinforcement through the through hole of the sheet that confluxes, be provided with between reinforcement for lead-out tablet pass through dodge screens.

6. battery connecting wafer structure according to claim 5, is characterized in that: described reinforcement respectively establishes one at the leading edge of via hole and back edge, is formed dodge screens between two reinforcements at the left hand edge of via hole and right hand edge.

7. the battery connecting wafer structure according to claim 2,3 or 4, it is characterized in that: described lead-out tablet is nickel sheet, the end that confluxes of nickel sheet is connected to the upper surface of the sheet that confluxes by electric resistance welding or Laser Welding, the battery core end of nickel sheet is connected on the electrode of battery core by electric resistance welding or Laser Welding.

8. the battery connecting wafer structure according to claim 2,3 or 4, it is characterized in that: described lead-out tablet is copper wire or aluminium wire, the end that confluxes of copper wire or aluminium wire is connected to the upper surface of the sheet that confluxes by ultrasonic bond, the battery core end of copper wire or aluminium wire is connected on the electrode of battery core by ultrasonic bond.

9. a battery modules, it is characterized in that: comprise some columniform battery cores and the battery connecting wafer structure of two panels according to any one of claim 1 ~ 8, each described battery core is contained between two panels battery connecting wafer structure all in the same way, the two ends of battery core embed in the groove of two panels battery connecting wafer structure respectively, and connect with the corresponding sheet that confluxes respectively by lead-out tablet.