CN217086672U - Secondary battery module sampling structure - Google Patents

Abstract

The present application relates to a secondary battery module sampling structure, and relates to the technical field of battery modules. The secondary battery module sampling structure includes: a cell unit and a busbar electrically connected to the cell unit, wherein the busbar is provided with A fuse module, the fuse module includes a base plate, a first welding piece, a second welding piece and a fuse, the base plate is connected to the upper end face of the cell unit, and the first welding piece is fixedly connected to the upper end face of the base plate, and is electrically connected to the corresponding bus bar. The second welding piece is fixedly connected to the upper end surface of the base plate, and is electrically connected with the first welding piece through the above-mentioned fuse, and the second welding piece is connected to the battery management system. The utility model solves the problems that the whole sampling structure needs to be replaced after the battery module is short-circuited, which causes difficulty in repairing, high cost, and the circuit board blocks the explosion-proof valve of the electric core.

Description

A secondary battery module sampling structure

technical field

The present application relates to the technical field of battery modules, in particular to a secondary battery module sampling structure.

Background technique

Lithium batteries are the secondary power sources with the highest energy density so far. They have many advantages, but they also have hidden dangers, the biggest of which is the safety management of batteries.

Most of the existing power lithium battery grouping technologies adopt the "single-channel centralized" management mode. Taking the current electric vehicles and electric energy storage stations as examples, the battery management method is to conduct large-scale parallel connection through the cells first. A parallel module is formed, and then all the parallel modules are connected in series to achieve a certain target voltage and form the battery required by the system application. In the process of battery management, each parallel module collects data such as voltage, current, and temperature, and then uploads it to a centralized battery management system (BMS, Battery Management System), and controls the protection switch in real time through the BMS.

In order to prevent the short circuit of the sampling circuit in the parallel module, a flexible circuit board (FPC, Flexible Printed Circuit) or a flexible flat cable (FFC, Flexible Flat Cable) are generally used. However, FPC is expensive and requires a wiring harness to connect to the BMS, and the production cycle is long; if FFC is used, although the price is cheap and the production cycle is short, it cannot prevent short circuits in parallel modules, which will cause safety hazards. Regardless of FPC or FFC, if a short circuit occurs, the whole needs to be replaced, which is difficult and costly to repair. And when there are many parallel modules, the area of FPC and FFC is too large due to the need to set up enough connection loops, thus blocking the explosion-proof valve of the battery cell, and the explosion-proof valve cannot be opened in the event of a safety accident.

Utility model content

In view of the defects existing in the prior art, the purpose of the present application is to provide a secondary battery module sampling structure, so as to solve the problem of difficulty in repairing, high cost and circuit breakage caused by the need to replace the sampling structure as a whole after the battery module is short-circuited in the related art The problem that the board shields the explosion-proof valve of the cell.

In order to achieve the above purpose, the present application provides a secondary battery module sampling structure, which includes: a cell unit and a busbar electrically connected to the cell unit, the busbar is equipped with a fuse module, and the fuse module includes:

a substrate, which is connected to the upper end face of the cell unit;

a first soldering piece, which is fixedly connected to the upper end face of the substrate and is electrically connected to the corresponding bus bar;

The second soldering piece is fixedly connected to the upper end surface of the base plate, and is electrically connected to the first soldering piece through a fuse, and the second soldering piece is connected to the battery management system.

In some embodiments, the fuse module further includes a welding plate, one end of the welding plate is connected to the first welding piece, and the other end of the welding plate is connected to the bus bar.

In some embodiments, the above-mentioned first welding piece is provided with a through first welding hole;

The above welded plate includes:

a main body part, which is connected to the lower end surface of the bus bar;

The welding part is connected to the upper end surface of the main body part, passes through the base plate and the first welding hole in sequence, and is connected with the first welding piece.

In some embodiments, the second solder tab is connected to the battery management system through a conductive member.

In some embodiments, a second welding hole is formed on the upper end surface of the second welding piece, and the second welding piece is connected to the conducting member through the second welding hole.

In some embodiments, the second soldering piece includes a connection terminal, and the second soldering piece is connected to the conductive member through the connection terminal.

In some embodiments, the above-mentioned fuses are chip fuses, etched fuses or cylindrical fuses.

In some embodiments, the above-mentioned conductive member is a wire, a flexible circuit board or a flexible flat wire.

In some embodiments, at least one cell unit is provided, and at least two bus bars are provided, and the number is one more than the number of cell units.

In some embodiments, when there are two bus bars, the two bus bars are respectively connected to the two poles of the cell unit;

When the number of the above-mentioned busbars is more than two, the busbar connected with two adjacent cell units is used as the first busbar; the busbar connected with the cell units at both ends of the battery module is used as the first busbar Two bus bars are used to lead out the positive and negative poles of the battery module.

The beneficial effects brought by the technical solution provided by this application include:

The embodiment of the present application provides a secondary battery module sampling structure, which includes a cell unit, a bus bar and a fuse module, the bus bar is electrically connected to the cell unit, and a fuse module is arranged on each bus bar, Each fuse module includes a base plate, a first welding piece, a second welding piece and a fuse, the base plate is fixedly connected to the upper end surface of the cell unit, the first welding piece and the second welding piece are both fixedly connected to the base plate, and pass through the fuse Connection, the first solder tab is connected to the bus bar, the second solder tab is connected to the conductive piece, and the other end of the conductive piece is connected to the battery management system (BMS) to form a complete sampling loop, by connecting a fuse module on each bus bar , which can not only collect and detect the data of each parallel module and provide protection, but also when any parallel module has a fuse blown, only need to replace the corresponding fuse module, which reduces the repair cost and difficulty of the battery module.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1 is a front view of a sampling structure of a secondary battery module according to an embodiment of the present invention;

2 is a schematic diagram of a connection between a fuse module and a conductive member according to an embodiment of the present invention;

Fig. 3 is the structural representation of the welding plate in Fig. 2;

Fig. 4 is the structural representation of the fuse module in Fig. 2;

5 is a schematic diagram of a second structure of a fuse module according to an embodiment of the present invention;

6 is a third structural schematic diagram of a fuse module according to an embodiment of the present invention;

7 is a schematic diagram of a fourth structure of a fuse module according to an embodiment of the present invention.

Reference number:

1. Cell unit;

2. Bus bar; 21. First bus bar; 22. Second bus bar;

3. Fuse module; 31, base plate; 32, first soldering piece; 321, first soldering hole; 33, second soldering piece; 331, second soldering hole; 332, connecting terminal; 34, fuse; 35, soldering plate ; 351, the main body part; 352, the welding part;

4. Conductor.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

The embodiment of the present application provides a secondary battery module sampling structure, which can solve the problems that the whole sampling structure needs to be replaced after the battery module is short-circuited, which causes difficulty in repairing, high cost, and the circuit board blocks the explosion-proof valve of the battery cell.

As shown in FIG. 1 , the sampling structure of the secondary battery module provided by the embodiment of the present application includes a cell unit 1 , a bus bar 2 and a fuse module 3 . The cell unit 1 is electrically connected to the bus bar 2 . A fuse module 3 is arranged on the bus bar 2, and the other end of each fuse module 3 is connected to the battery management system, thereby forming a complete sampling circuit.

Each of the fuse modules 3 includes a base plate 31 , a first welding piece 32 , a second welding piece 33 and a fuse 34 . The base plate 31 is connected to the upper end surface of the cell unit 1 , and the first welding piece 32 is fixedly connected to the base plate. 31 , and is electrically connected to the corresponding bus bar 2 .

The second soldering piece 33 is fixedly connected to the upper end surface of the substrate 31, and is electrically connected to the first soldering piece 32 through the fuse 34, and the second soldering piece 33 is connected to the battery management system.

It can be understood that the bus bar 2 is electrically connected to the cell unit 1, and a fuse module 3 is connected to each bus bar 2, and then the fuse module 3 is electrically connected to the battery management system to form a sampling loop. When the circuit is short-circuited, just replace the fuse module in the corresponding sampling circuit.

It can be understood that the base plate 31 is made of an insulating material, and the first welding piece 32 and the second welding piece 33 are both conductive metal pieces.

Further, as shown in FIG. 2 , the fuse module 3 further includes a welding plate 35 , one end of the welding plate 35 is connected to the first welding piece 32 , and the other end of the welding plate 35 is connected to the bus bar 2 .

Further, as shown in FIG. 3 and FIG. 4 , a first welding hole 321 penetrating the first welding sheet 32 is formed on the first welding sheet 32 , and the welding plate 35 includes a main body portion 351 and a welding portion 352 . The welding part 351 is connected to the lower end surface of the bus bar 2; the welding part 352 is connected to the upper end surface of the main body part 351. Slice 32 is connected.

It can be understood that one end of the main body portion 351 is disposed on the lower end face of the bus bar 2, and an insulating layer is disposed on the outer surface of the cell unit, so as to prevent the main body portion 351 from contacting the cell unit and affecting the operation of the sampling circuit, for further safety It is considered that an insulating layer may be provided on the side of the main body portion 351 close to the cell unit 1 .

In other embodiments, one end of the welding plate 35 can also be connected to the upper end surface of the first welding piece 32, and the other end of the welding plate 35 can be connected to the upper end surface of the bus bar 2, so that there is no need to open The welding hole can connect the bus bar 2 and the first welding piece 32 through the welding plate 35 .

It can be understood that the welding portion 352 passes through the above-mentioned base plate 31 and the above-mentioned first welding hole 321 in sequence, and is welded with the above-mentioned first welding piece 32 by means of brazing.

Further, as shown in FIG. 2 , the above-mentioned second welding piece 33 is connected to the battery management system through the conductive member 4 .

Further, as shown in FIG. 4 , the upper end surface of the second welding piece 33 is provided with a second welding hole 331 , and the conducting member 4 is connected to the second welding piece 33 through the second welding hole 331 .

It can be understood that, as shown in FIGS. 4 and 5 , the welding holes are arranged to facilitate brazing. Whether to arrange welding holes on the first welding piece and the second welding piece depends on the specific situation and process requirements, and the size of the welding holes. The specific size and shape can also be selected according to different welding requirements.

Optionally, the conducting member 4 may also be directly connected to the second welding piece 33 without passing through the welding hole.

Further, as shown in FIG. 6 , the second welding piece 33 includes a connecting terminal 332 , and the conducting member 4 is connected to the second welding piece 33 through the connecting terminal 332 .

Setting the connecting terminal 332 can facilitate the more stable connection between the wire harness-shaped conducting member and the sheet-shaped welding piece. Connect one end of the connecting terminal to the second welding piece, and crimp the other end of the connecting terminal to the conducting member to complete the conducting member. Connection to fuse module.

Optionally, as shown in FIGS. 4-7 , the above-mentioned fuse 34 is a chip fuse, an etched fuse or a cylindrical fuse.

It can be understood that the function of the fuse 34 is that when the current of the sampling circuit abnormally rises to a certain height and heat, the fuse itself fuses and cuts off the current to protect the safe operation of the entire battery module. The selection of the fuse is not limited to this. Three kinds of fuses are provided in the embodiment.

Further, the above-mentioned conducting member 4 is a wire, FFC or FPC.

The conductive member 4 is used to connect the fuse module and the battery management system, and may not be limited to wires, FFC or FPC. It is worth mentioning that the cost of using wires is the lowest, and the wires can be arranged and bent arbitrarily, which is suitable for more scenarios, and the effect of avoiding the explosion-proof valve of the cell is better.

Further, as shown in FIG. 1 , there is at least one cell unit 1 , at least two bus bars 2 , and the number of the bus bars is one more than the number of cell units.

Further, when the above-mentioned bus bars are provided with two, the number of cell units is one, and the two bus bars are respectively connected to the two poles of the cell unit to lead out the positive and negative electrodes, and are connected to the two bus bars. are connected to a fuse module.

When the number of the above-mentioned bus bars is more than two, the number of cell units is also multiple, and the bus bar connected with two adjacent cell units is used as the first bus bar 21 to connect with the two ends of the battery module. The busbars connected to the battery cells of the upper part are used as the second busbars 22 to lead out the positive and negative electrodes of the battery module.

In this embodiment, each of the first bus bars 21 is connected between the positive pole of one cell unit and the negative pole of the other cell unit in two adjacent cell units; One end of the two bus bars 22 is respectively connected to the pole of a cell unit that is not connected to the first bus bar 21 , and the other end of each second bus bar 22 extends away from the cell unit for drawing out the battery mold. positive and negative poles of the group.

The working principle of the present invention is as follows: each first bus bar 21 is connected between the positive pole of one cell unit and the negative pole of the other cell unit in the two adjacent cell units. The two ends of the battery module are respectively connected to the two second bus bars 22 to lead out the positive and negative electrodes of the battery module, and the first welding piece 32 on the fuse module 3 is connected to each of the first bus bars 21 and the second bus bar 21. On the second bus bar 22, the second welding piece 33 on the fuse module 3 is connected to a conducting member 4, and the other end of the conducting member 4 is connected to the battery management system, so as to form a complete sampling circuit, when the current in one sampling circuit is too large Or overheating, the fuse 34 on the fuse module 3 will be blown. At this time, only the corresponding fuse module needs to be replaced to ensure the normal operation of the sampling circuit of the entire battery module.

In the sampling structure of the secondary battery module of the embodiment of the present application, a fuse module is arranged on each bus bar, so that each sampling circuit in the battery module can be fused when a short circuit occurs, which not only improves the battery module's performance safety, easy replacement, and cost reduction; by setting the fuse module to include a first soldering piece connected to the base plate, a second soldering piece, and a fuse connecting the first soldering piece and the second soldering piece together, so that the The production of the fuse module is simple, the cost is low, the processing cycle is short, and it can be applied to various sampling structures; by directly connecting each fuse module to the cell unit, the problem of blocking the explosion-proof valve of the cell by the sampling circuit is avoided. , which improves the safety of the battery module.

In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the application and simplifying the description, Rather than indicating or implying that the referred device or element must have a particular orientation, be constructed and operate in a particular orientation, it should not be construed as a limitation on the application. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply Any such actual relationship or sequence exists between these entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The above descriptions are only specific embodiments of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, this application is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A secondary battery module sampling structure, characterized in that it comprises a cell unit (1) and a busbar (2) electrically connected to the cell unit (1), the busbar (2) is provided with There is a fuse module (3), and the fuse module (3) includes: a base plate (31), which is connected to the upper end face of the cell unit (1); a first soldering piece (32), which is fixedly connected to the upper end face of the base plate (31) and is electrically connected to the corresponding bus bar (2); A second soldering piece (33) is fixedly connected to the upper end surface of the base plate (31), and is electrically connected to the first soldering piece (32) through a fuse (34), and the second soldering piece (33) Connect the battery management system. 2. The secondary battery module sampling structure according to claim 1, wherein: The fuse module (3) further comprises a welding plate (35), one end of the welding plate (35) is connected to the first welding piece (32), and the other end of the welding plate (35) is connected to the bus bar (2) ). 3. The secondary battery module sampling structure according to claim 2, wherein the first welding piece (32) is provided with a penetrating first welding hole (321); The welding plate (35) includes: a main body part (351), which is connected to the lower end surface of the bus bar (2); A welding part (352), which is connected to the upper end surface of the main body part (351), passes through the base plate (31) and the first welding hole (321) in sequence, and is connected with the first welding piece (32) connect. 4. The secondary battery module sampling structure according to claim 1, wherein: The second welding piece (33) is connected to the battery management system through the conducting member (4). 5. The secondary battery module sampling structure according to claim 4, wherein: A second welding hole (331) is formed on the upper end surface of the second welding piece (33), and the second welding piece (33) is connected to the conducting member (4) through the second welding hole (331). 6. The secondary battery module sampling structure according to claim 4, wherein: The second soldering piece (33) includes a connecting terminal (332), and the second soldering piece (33) is connected to the conducting member (4) through the connecting terminal (332). 7. The secondary battery module sampling structure according to claim 1, wherein: The fuse (34) is a patch fuse, an etching fuse or a cylindrical fuse. 8. The secondary battery module sampling structure according to claim 4, wherein: The conducting member (4) is a wire, a flexible circuit board or a flexible flat wire. 9. The secondary battery module sampling structure according to claim 1, wherein: At least one battery cell unit (1) is provided, and at least two busbars (2) are provided, and the number is one more than the number of battery core units. 10. The secondary battery module sampling structure according to claim 9, wherein: When two bus bars (2) are provided, the two bus bars (2) are respectively connected to the two pole posts of the cell unit; When the number of the busbars (2) is more than two, the busbar connected with two adjacent cell units is used as the first busbar (21); The busbars connected to the units are used as second busbars (22) to lead out the positive and negative electrodes of the battery module.

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