CN212540541U

CN212540541U - A device for power battery module rosin joint detects

Info

Publication number: CN212540541U
Application number: CN202021871282.XU
Authority: CN
Inventors: 李龙鑫
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-02-12
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a device for power battery module rosin joint detects belongs to battery module quality testing technical field, and it is main through concatenating each electric core to set up a plurality of detecting element, with the resistance of simultaneous measurement a plurality of electric cores and coupling assembling splice, be particularly useful for methods such as four-terminal method and measure. And simultaneously, the utility model discloses in the middle of, a plurality of electric cores concatenate together through a plurality of coupling assembling, suit with its use operating mode, compare with the measuring method that only is directed against an electric core and coupling assembling's welding department, electric current, voltage stability when this application still has the measurement, measure the more accurate advantage of numerical value.

Description

A device for power battery module rosin joint detects

Technical Field

The utility model relates to a battery module detection area particularly, relates to a device that is used for power battery module rosin joint to detect.

Background

With the development of new energy vehicles, electric bicycles and other vehicles, the power battery is widely applied. In order to achieve the required use voltage or current, the electric cores of the power battery need to be welded in series or in parallel by using the connecting assembly, so that the power battery pack with high energy density and long service life is formed. However, when the cell pole and the connecting assembly are welded, due to the existence of foreign matters or other factors such as process parameters, the pole of the power cell and the connecting assembly can be subjected to cold joint during welding.

In the prior art, the method for detecting the insufficient solder comprises the following technical means:

(1) the power battery pack is pulled down and shaken down by external force, and if the power batteries are not loosened in a group, the power battery pack is determined to have no cold joint; or when the power battery is welded, the welding point is observed by a visual observation method to judge whether the insufficient welding exists;

(2) scanning a welding position through a three-dimensional CCD, and judging whether the cold joint exists or not through factors such as welding appearance, height and the like;

(3) through EOL power test, the instantaneous change value of the monomer voltage under the module developments is gathered to corresponding calculation reachs the direct current internal resistance of monomer electricity core, and the welding effect of monomer electricity core is judged to the size of rethread direct current internal resistance.

However, the following problems exist in the prior art:

(1) shifting the battery pack through external force may result in that the welding strength of the connecting assembly and the battery cell is weakened;

(2) when a thicker connecting component is adopted, CCD scanning cannot scan to judge whether cold joint exists or not through appearance;

(3) the data acquired by the monomer voltage on the EOL equipment comprise the direct current internal resistance of the cell (the data judgment of the cell is deviated due to the fact that the cell is subjected to the inconsistency of the current and voltage rising and falling rates instantly), the consistency of the manufacture of the slave control board, EMC interference and the like, so that the accuracy of the acquisition of the monomer voltage is influenced, and the repeatability and the confidence of a test value are reduced.

SUMMERY OF THE UTILITY MODEL

The utility model solves the technical problem that: the utility model provides a resistance value that is used for power battery module rosin joint to detect, its can comparatively accurately record coupling assembling and electric core utmost point post welding department.

The application is realized by adopting the following technical scheme:

the utility model provides a device for power battery module rosin joint detects, power battery module is including a plurality of electric cores and a plurality of coupling assembling, coupling assembling welds with the utmost point post of electric core, a plurality of electric cores are established ties together through coupling assembling and positive negative pole continuously, be formed with on the coupling assembling with utmost point post matched with locating hole, the device is including:

the number of the detection units corresponds to that of the connection assemblies, and each detection unit comprises two first probes;

the current unit is provided with a current input end and a current output end, the current input end and the current output end are respectively in conductive contact with two ends of the electric cores which are connected in series together so as to form a current loop, and the current unit is used for charging and discharging the electric cores which are connected in series together;

the frame body is provided with a first position which enables one first probe in each detection unit to be in conductive contact with the outer surface of the corresponding connecting component, and the other first probe penetrates into the positioning hole of the corresponding connecting component and is in conductive contact with the pole; and the resistance detection unit is used for detecting the resistance of the part of each detection unit, which is accessed by the two first probes.

Preferably, the current input terminal and the current output terminal of the current unit are mounted on the housing.

Preferably, the current unit includes two sets of connecting portions respectively forming a current input end and a current output end of the current unit, the connecting portion includes a plurality of second probes, and when the frame body is located at the first position, the second probes in the two sets of connecting portions are respectively in conductive contact with two ends of the battery cell connected in series.

Preferably, the number of second probes in each set of connections is 9 or more.

Preferably, each of the probe units further includes a mounting seat, and the first probe in each of the probe units is mounted on the frame body through the mounting seat.

Preferably, the first probes are capable of extending and contracting and have a tendency to extend, and each first probe is in a compressed state when the frame body is in the first position.

Preferably, first probe is including electrically conductive stiff end and the flexible end of connecting, the stiff end is the tube-shape and is connected with the mount pad, flexible end assembly is in the middle of the stiff end and partially stretch out outside the stiff end under natural state, the one end that the stiff end was kept away from to flexible end is used for with coupling assembling or utmost point post conductive contact.

Preferably, the part of the telescopic end extending out of the fixed end is sleeved with an insulating sleeve, when the frame body is located at the first position, the insulating sleeve enters the positioning hole along with the first probe and is in clearance fit with the positioning hole, and a clearance is reserved between the first probe and the inner wall of the positioning hole.

Preferably, the resistance detection unit includes:

the A/D converter is used for being electrically connected with the first probes in the detection units respectively;

the processor is electrically connected with the A/D converter and used for acquiring voltage values of the parts of the detection units, to which the two first probes are connected; the processor is further used for acquiring a current value in the current loop; the processor obtains the resistance value of the part of each detection unit where the two first probes are connected according to the current value and the voltage value, compares the resistance value with a preset threshold value and judges a result;

and the display unit is used for receiving and displaying the judgment result of the resistance value of the access part of each detection unit processed by the processor.

Compared with the prior art, the beneficial effect of this application includes:

the application provides a pair of a device for power battery module rosin joint detects can measure the resistance of a plurality of electric cores and coupling assembling splice simultaneously through the device, is particularly useful for methods such as four-terminal method to measure. Simultaneously, in the middle of the application, a plurality of electric cores are in the same place through a plurality of coupling assembling concatenations, suit with its service condition, compare with the measuring method who only is directed at a electric core and coupling assembling's splice, and electric current, voltage stability during this application still has the measurement, measure the more accurate advantage of numerical value.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.

Fig. 1 and fig. 2 are schematic structural views of embodiment 1 provided by the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is an enlarged view of a portion of FIG. 2 at B;

fig. 5 is a schematic structural view of a connection assembly according to embodiment 1 of the present invention;

fig. 6 is a schematic structural diagram of a detection unit in embodiment 1 provided by the present invention;

fig. 7 is a schematic structural diagram of a first probe according to embodiment 1 of the present invention;

fig. 8 is a schematic structural view of a connecting portion in embodiment 1 of the present invention.

[ Specification of symbols ]

1-connecting component, 11-welding groove, 12-positioning hole, 2-battery core, 3-frame body, 4-detection unit, 41-first probe, 41 a-telescopic end, 41 b-fixed end, 42-mounting seat, 5-mounting hole, 6-insulating sleeve, 7-connecting part and 71-second probe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the product of the present invention is used, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred must have a specific position, be constructed and operated in a specific position, and thus, cannot be understood as a limitation of the present invention. Furthermore, the appearances of the terms "first," "second," and the like in the description of the present invention are only used for distinguishing between the descriptions and are not intended to indicate or imply relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present invention do not require that the components be absolutely horizontal or hanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1

As shown in fig. 1 and fig. 2, in the device for detecting a cold joint of a power battery module provided in embodiment 1, the power battery module includes a plurality of battery cores 2 and a plurality of connecting assemblies 1, the connecting assemblies 1 are welded to poles of the battery cores 2, the battery cores 2 are connected in series through the connecting assemblies 1 in a manner that positive and negative electrodes are connected, and a positioning hole 12 matched with the pole is formed in the connecting assembly 1;

the device comprises:

a plurality of detecting units 4 corresponding to the number of the connecting assemblies 1, each detecting unit 4 including two first probes 41;

the current unit 5 is provided with a current input end and a current output end, the current input end and the current output end are respectively in conductive contact with two ends of the electric cores 2 which are connected in series together so as to form a current loop, and the current unit 5 is used for charging and discharging the electric cores 2 which are connected in series together;

the frame body 3 is provided with a plurality of detection units 4, the frame body 3 is provided with a first position which enables one first probe 41 in each detection unit 4 to be in conductive contact with the outer surface of the corresponding connecting component 1, and the other first probe 41 penetrates through the positioning hole 12 of the corresponding connecting component 1 and is in conductive contact with the pole;

and a resistance detection unit for detecting the resistance of the portions of the respective probe units 4 to which the two first probes 41 are connected.

Referring to fig. 1 and 2, it can be known that: in this embodiment 1, the power battery module is located the below of framework 3, and each electric core 2 arranges in proper order along the length direction of power battery module. Meanwhile, the battery cell 2 is arranged on one side of the power battery module in the width direction, and the positive pole column and the negative pole column are arranged on the other side of the power battery module. Each connecting component 1 is arranged in a left-right progressive manner along the length direction in order to respectively weld and connect the positive pole column and the negative pole column of different battery cells 2, so that each battery cell 2 is connected in series.

Meanwhile, referring to fig. 3 and 5, in this embodiment 1, the connecting assembly 1 includes a welding groove 11 and a positioning hole 12, the positioning hole 12 is disposed in the welding groove 11, and the size of the welding groove 11 matches the size of the pole column of the battery cell 2; the electric core 2 pole is provided with a bulge for matching with the positioning hole 12, and when welding, the bulge is inserted into the positioning hole 12 for positioning, so that the welding is more accurate; the electric core 2 pole column can also be positioned by adopting a groove, the groove is arranged on the electric core 2 pole column, the electric core 2 pole column is inserted into the positioning hole 12 through a contact pin before welding, the bottom end of the contact pin is inserted into the groove on the electric core 2 pole column to position the connecting assembly 1 and assist in welding, and the connecting assembly 1 is welded on the electric core 2 as shown in the figure; the coupling unit 1 in the figure is shaped like a Chinese character ji, and the coupling unit 1 may be a flat plate type according to the actual situation, and may be provided according to the actual situation.

When detection is specifically needed, the frame 3 moves to the first position, and at this time, the current unit 5 performs charge and discharge, so that the battery cell 2 is charged and discharged, and current is formed in a current loop. Since the first probe 41 of each detecting unit 4 is in conductive contact with the exterior of the corresponding connecting component 1, and the other first probe 41 penetrates through the positioning hole 12 of the corresponding connecting component 1 and is in conductive contact with the pole, the welding position is connected between the two first probes 41, so that the resistance detecting unit can directly detect the resistance value of each welding position. At this moment, the implementer can judge whether the cold joint occurs at the welding position of the connecting component 1 and the pole column according to the resistance value conveniently. The embodiment can measure the resistance of the welding positions of the plurality of battery cells 2 and the connecting assembly 1 at the same time, and is particularly suitable for measuring by methods such as a four-end method. Simultaneously, in the middle of the application, a plurality of electric cores 2 connect in series through a plurality of coupling assembling 1 and be in the same place, suit with its service condition, compare with the measuring method that only is directed at the splice of an electric core 2 and coupling assembling 1, current, voltage stability during this application still has the measurement, measure the more accurate advantage of numerical value.

As a preferred embodiment, please refer to fig. 4, in embodiment 1, a current input end and a current output end of the current unit 5 are installed on the frame 3, meanwhile, the current unit 5 includes two sets of connection portions 7 respectively forming the current input end and the current output end thereof, the connection portions 7 include a plurality of second probes 71, and when the frame 3 is at the first position, the second probes 71 in the two sets of connection portions 7 are respectively in conductive contact with two ends of the electric core 2 connected in series. This design ensures that the probe unit and the current unit 5 are in the rest position when the frame 3 is moved to the first position, avoiding additional wiring.

Meanwhile, as a preferred embodiment, in the present embodiment 1, the number of the second probes 71 in each group of the connection portions 7 is 9 or more, so that the second probes 71 in the connection portions 7 are connected in parallel when being connected, so as to reduce the current value of the single second probe 71.

As shown in fig. 6, each detection unit 4 further includes a mounting seat 42, the first probe 41 in each detection unit 4 is mounted on the frame 3 through the mounting seat 42, in this embodiment 1, the mounting seat 42 is detachably connected to the frame 3, so that the practitioner can adjust the form of each detection unit 4, and more specifically, the mounting seat 42 is engaged with the frame 3 through the mounting hole 5.

Meanwhile, in order to avoid the first probe 41 from being bent due to rigid contact with the connection assembly 1 and the pole, as a preferred embodiment, in this embodiment 1, the first probe 41 can extend and contract and has a tendency to extend, and when the frame 3 is at the first position, each first probe 41 is in a compressed state. The flexible contact mode can effectively avoid the situation that the first probe 41 is broken due to positioning errors.

More specifically, as shown in fig. 7, the first probe 41 includes a fixing end 41b and a telescopic end 41a that are electrically connected, the fixing end 41b is cylindrical and is connected with the mounting base 42, the telescopic end 41a is assembled in the fixing end 41b and partially extends out of the fixing end 41b in a natural state, and one end of the telescopic end 41a away from the fixing end 41b is used for electrically contacting with the connecting assembly 1 or the pole.

Meanwhile, if the telescopic end 41a of the first probe 41 accidentally contacts the inner wall of the positioning hole 12 during the process of being inserted into the positioning hole 12, the welded portion may be separated from the two first probes 41, and the resistance detection module may no longer be able to detect the resistance of the welded portion, so that it is desirable to optimize and improve the structure of the second probe 71 extending into the positioning hole 12. Therefore, as a preferred embodiment, in this embodiment 1, the insulating sleeve 6 is sleeved on the portion other than the fixed end 41b, when the frame body 3 is at the first position, the insulating sleeve 6 enters the positioning hole 12 along with the first probe 41 and is in clearance fit with the positioning hole 12, and a clearance is left between the first probe 41 and the inner wall of the positioning hole 12. The structure style can ensure the contact reliability between the first probe 41 and the pole, and the detection precision is improved.

In addition, in embodiment 1, the resistance detection unit specifically includes:

an a/D converter for electrically connecting with the first probes 41 in each of the detecting units 4, respectively;

the processor is electrically connected with the A/D converter and is used for acquiring voltage values of positions where the two first probes 41 in each detection unit 4 are connected; the processor is further used for acquiring a current value in the current loop; the processor obtains the resistance value of the part where the two first probes 41 are connected in each detection unit 4 according to the current value and the voltage value, compares the resistance value with a preset threshold value and judges a result;

and the display unit is used for receiving and displaying the judgment result of the resistance value of the access part of each detection unit 4 processed by the processor.

In this embodiment 1, after the circuit is connected, the processor acquires the voltage values of the electric cores 2 and the connecting assembly 1 and the current value passing through the current connecting unit 5 at the same time in turn through the a/D converter, and obtains the resistance value of the welding position through calculation, and when the resistance value is smaller than the resistance threshold value, the circuit is determined to be qualified; and when the resistance value is larger than the resistance threshold value, judging that the defect exists, and reminding a user through a display.

The detection method of the embodiment 1 is as follows:

moving the frame 3 to a first position relative to the power battery module;

charging and discharging the electric cores 2 connected in series to enable the instantaneous current to reach more than 300A;

after the current is required, the processor acquires the voltage value and the current value of the part, connected with the two first probes 41, of each detection unit through the A/D converter, and the processor acquires the resistance value of the welding position according to the voltage value and the resistance value;

the processor compares the resistance value of the welding position with a preset threshold value to judge, and obtains a judgment result, wherein the resistance value of the welding position is judged to be unqualified when exceeding the threshold value, and the resistance value of the welding position is judged to be qualified when not exceeding the threshold value; specifically, the preset threshold is 0.1m Ω.

The processor transmits the judgment result to the display unit, and the display unit displays the judgment result.

In this embodiment 1, the resistance at the welding point is measured by a four-terminal method, and the quality of the welding point can be determined by visually detecting the voltage drop value of the welding point by the above method, or the voltage can be measured by a bridge voltage method or the like.

The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for detecting the rosin joint of a power battery module, wherein the power battery module comprises a plurality of battery cores (2) and a plurality of connecting assemblies (1), the connecting assemblies (1) are welded with poles of the battery cores (2), the battery cores (2) are connected in series with the positive and negative poles connected through the connecting assemblies (1), a positioning hole (12) matched with the pole is formed in the connecting assemblies (1), and the device is characterized in that,

the device comprises:

a plurality of detection units corresponding to the number of the connection assemblies (1), each detection unit comprising two first probes (41);

the current unit (5) is provided with a current input end and a current output end, the current input end and the current output end are respectively in conductive contact with two ends of the electric cores (2) which are connected in series to form a current loop, and the current unit (5) is used for charging and discharging the electric cores (2) which are connected in series;

the frame body (3) is provided with a plurality of detection units which are arranged on the frame body (3), the frame body (3) is provided with a first position which enables one first probe (41) in each detection unit to be in conductive contact with the outer surface of the corresponding connecting component (1), and the other first probe (41) penetrates into a positioning hole (12) of the corresponding connecting component (1) and is in conductive contact with the pole;

and a resistance detection unit for detecting the resistance of the position where the two first probes (41) are connected in each detection unit.

2. The device for detecting the cold joint of the power battery module as claimed in claim 1, wherein the current input end and the current output end of the current unit (5) are mounted on the frame body (3).

3. The device for detecting the cold joint of the power battery module as set forth in claim 2, wherein the current unit (5) comprises two sets of connection portions respectively forming a current input end and a current output end thereof, the connection portions comprise a plurality of second probes (71), and when the frame body (3) is in the first position, the second probes (71) in the two sets of connection portions are respectively in conductive contact with two ends of the electric core (2) connected in series.

4. The device for detecting the cold joint of the power battery module as claimed in claim 3, wherein the number of the second probes (71) in each group of the connecting parts is more than 9.

5. The device for detecting the cold joint of the power battery module as claimed in claim 1, wherein each detection unit further comprises a mounting seat (42), and the first probe (41) of each detection unit is mounted on the frame body (3) through the mounting seat (42).

6. The device for detecting the cold joint of the power battery module as claimed in claim 5, wherein the first probes (41) are capable of extending and contracting and have a tendency to extend, and when the frame body (3) is at the first position, each first probe (41) is in a compressed state.

7. The device for detecting the cold joint of the power battery module as claimed in claim 6, wherein the first probe (41) comprises a fixing end (41b) and a telescopic end (41a) which are electrically connected, the fixing end (41b) is cylindrical and is connected with the mounting seat (42), the telescopic end (41a) is assembled in the fixing end (41b) and partially extends out of the fixing end (41b) in a natural state, and one end of the telescopic end (41a) extending out of the fixing end (41b) is used for extending into the positioning hole (12) to be electrically contacted with the connecting component (1) or the pole.

8. The device for detecting the cold joint of the power battery module as claimed in claim 7, wherein the part of the telescopic end (41a) extending out of the fixed end (41b) is sleeved with an insulating sleeve (6);

when the frame body (3) is located at the first position, the insulating sleeve (6) enters the positioning hole (12) along with the first probe (41) and is in clearance fit with the positioning hole (12), and a clearance is reserved between the telescopic end (41a) and the inner wall of the positioning hole (12).

9. The device for detecting the cold joint of the power battery module as claimed in any one of claims 1 to 8, wherein the resistance detection unit comprises:

the A/D converter is used for being electrically connected with the first probes (41) in the detection units respectively;

the processor is electrically connected with the A/D converter and used for acquiring the voltage values of the parts of the detection units, to which the two first probes (41) are connected; the processor is further used for acquiring a current value in the current loop; the processor obtains the resistance value of the part of each detection unit where the two first probes (41) are connected according to the current value and the voltage value, compares the resistance value with a preset threshold value and judges a result;