CN217991272U - Electricity core testing arrangement - Google Patents

Abstract

The utility model relates to the technical field of batteries, specifically disclose an electricity core testing arrangement. The device is used for testing the battery cell to be tested and comprises a connecting piece module and a clamp module which forms a clamping groove for accommodating the battery cell to be tested; the connecting piece module comprises a testing assembly and an overcurrent connecting piece and an overvoltage connecting piece which are electrically connected to the testing assembly, the overcurrent connecting piece is bent to form an overcurrent bending part extending towards the opening of the clamping groove in the first direction, the overcurrent bending part is respectively bent to form at least two current welding bosses extending towards the opening of the clamping groove in the second direction and fixedly connected to the electric core to be tested, the overvoltage connecting piece is bent to form an overvoltage bending part extending towards the opening of the clamping groove in the first direction, and the overvoltage bending part is bent to form a voltage welding boss extending towards the opening of the clamping groove in the second direction and fixedly connected to the electric core to be tested. The connection piece structure has been optimized in this device's institutional advancement, has solved the not enough and poor problem of connection piece welding effect of electric core testing arrangement throughput.

Description

Electricity core testing arrangement

Technical Field

The utility model relates to a battery technology field especially relates to an electricity core testing arrangement.

Background

The lithium ion battery generally needs to perform a direct current internal resistance test, which is one of important indexes for evaluating the performance of the battery, and is often used for evaluating the health state of the battery, predicting the service life, and estimating data such as the system charge state, the output and input capability, and the like.

However, when the existing cell testing device tests a cylindrical cell with a steel shell, the following defects exist:

1) The test connecting sheet on the existing battery cell test device adopts laser pulse welding, and the thickness of the connecting sheet is required to be thinner. The thin sheet laser pulse welding is adopted in the testing process of the steel shell cylindrical battery cell, so that the condition of insufficient overcurrent capacity is easily caused, the connection sheet is burnt through or the pole is seriously heated, and the testing result is influenced;

2) The welding area of the test connecting sheet on the existing battery cell testing device is wider, and the ultrasonic welding can be completed only by using larger pressure and power, so that the pole column can be greatly deformed by the process, and the sealing property of the steel shell cylindrical battery cell is easily influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an electricity core testing arrangement to solve the not enough and poor problem of test connection piece welding effect of electricity core testing arrangement throughput.

To achieve the purpose, the utility model adopts the following technical proposal:

a cell testing device is used for testing a cell to be tested and comprises a clamp module and a connecting piece module; the clamp module selectively clamps the battery cell to be tested, and forms a clamping groove for accommodating the battery cell to be tested; the connection piece module includes test assembly and electricity connect in connection piece and the excessive pressure connection piece overflows on the test assembly, it has the kink of overflowing to buckle on the connection piece to overflow, it moves towards on the first direction to overflow the kink the opening in centre gripping groove extends, it has two at least current welding bosss to overflow the kink respectively to buckle, current welding boss moves towards in the second direction the opening in centre gripping groove extends and the rigid coupling in the electric core that awaits measuring, it has the excessive pressure kink to buckle on the excessive pressure connection piece, the excessive pressure kink moves towards in the first direction the opening in centre gripping groove extends, the excessive pressure kink is buckled there is the voltage welding boss, the voltage welding boss moves towards in the second direction the opening in centre gripping groove extends and the rigid coupling in the electric core that awaits measuring.

As a preferred technical scheme of the cell testing device, the cell to be tested is provided with a cell pole post and a cell steel shell, and at least part of the cell pole post and the cell steel shell are exposed out of the opening of the clamping groove; the overcurrent bending part comprises an anode overcurrent connecting piece and a cathode overcurrent connecting piece, the anode overcurrent connecting piece is respectively connected with the battery cell pole through a first anode current welding boss and a second anode current welding boss, and the cathode overcurrent connecting piece is respectively connected with the battery cell steel shell through a first cathode current welding boss and a second cathode current welding boss.

As the preferred technical scheme of electric core testing arrangement, the excessive pressure kink includes anodal excessive pressure connection piece and negative pole excessive pressure connection piece, anodal excessive pressure connection piece pass through anodal voltage welding boss with electric core utmost point post electricity is connected, negative pole excessive pressure connection piece pass through negative pole voltage welding boss with electric core steel casing electricity is connected.

As a preferred technical solution of the cell testing device, the connecting piece module is screwed to the testing component through a connecting bolt.

As a preferred technical solution of the cell testing apparatus, the current welding boss and the voltage welding boss are both ultrasonically welded to the cell to be tested.

As a preferred technical scheme of the cell testing device, the cell pole and the cell steel shell are located at the same end of the cell to be tested, the connecting sheet module is divided into a first connecting sheet group and a second connecting sheet group, and the first connecting sheet group and the second connecting sheet group are symmetrical with respect to an opening of the clamping groove; the first connecting plate group comprises the positive electrode overcurrent connecting plates and the positive electrode overvoltage connecting plates which are arranged in parallel at intervals along a third direction, and the second connecting plate group comprises the negative electrode overcurrent connecting plates and the negative electrode overvoltage connecting plates which are arranged in parallel at intervals along the third direction.

As a preferred technical solution of the battery cell testing device, the first direction is the same as the length direction of the clamping groove.

As a preferred technical solution of the cell testing apparatus, any two of the first direction, the second direction, and the third direction are perpendicular to each other.

As a preferred technical solution of the battery cell testing device, there are two testing assemblies, one of which is electrically connected to the first connecting plate set, and the other of which is electrically connected to the second connecting plate set.

As a preferred technical scheme of the battery cell testing device, the clamp module comprises two opposite battery cell clamps, the two battery cell clamps respectively clamp two sides of the testing assembly, and the two battery cell clamps and the two testing assemblies enclose the clamping groove.

The utility model has the advantages that:

this electric core testing arrangement has optimized the connected mode of connection piece and the electric core that awaits measuring through the institutional advancement to the connection piece module, with the help of connecting between piece and the kink and twice the buckling of kink and welding boss, can effectual adjustment welding boss and the relative position between the connection piece, and then reduced the connection piece effectively and carried out welding operation's the degree of difficulty with the electric core that awaits measuring, reduced the risk of bad welding, promoted welding operation's efficiency. The design of two at least current welding bosss through the mode that converges after carrying out the split with a connection piece that overflows, has avoided the ultrasonic bonding head to the excessive extrusion of the electric core that awaits measuring, has reduced the risk of the electric core weeping that awaits measuring. The total overcurrent capacity of the overcurrent connecting piece is unchanged, but the welding difficulty is greatly reduced, so that the overcurrent connecting piece has the advantages of protecting the battery cell to be tested from being damaged and improving the test safety performance, simultaneously reducing the width of a welding area, reducing the difficulty of ultrasonic welding, meeting the overcurrent requirement and avoiding the hidden trouble of the overcurrent connecting piece due to poor overcurrent capacity. Simultaneously, the setting of centre gripping groove has ensured the location effect to the electric core that awaits measuring in the anchor clamps module, has promoted the degree of accuracy to electric core test centre gripping. The problem that the overcurrent capacity of the battery cell testing device is insufficient is solved through the improvement, and the conditions of poor welding and harsh welding conditions during ultrasonic welding of the connecting sheet are avoided.

Drawings

Fig. 1 is a schematic structural diagram of a cell testing apparatus and a cell to be tested provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cell testing apparatus provided by an embodiment of the present invention;

fig. 3 is an exploded view of a cell testing apparatus provided in an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an anode overcurrent connecting piece provided by an embodiment of the present invention;

fig. 5 is a schematic structural view of a positive overvoltage connecting piece provided by an embodiment of the present invention;

fig. 6 is a schematic structural view of a negative overcurrent connecting piece provided by an embodiment of the present invention;

fig. 7 is a schematic structural view of a negative electrode overvoltage connecting piece provided by an embodiment of the present invention.

In the figure:

100. a positive overcurrent connecting sheet; 110. a first through hole; 120. a first bent portion; 130. a first positive electrode current welding boss; 140. a second positive electrode current welding boss; 200. an anode overvoltage connecting sheet; 210. a second through hole; 220. a second bent portion; 230. welding a boss by positive voltage; 300. a negative overcurrent connecting sheet; 310. a third through hole; 320. a third bent portion; 330. a first negative current welding boss; 340. a fourth bent portion; 350. a second cathode current welding boss; 400. a negative electrode overvoltage connecting sheet; 410. a fourth via hole; 420. a fifth bent portion; 430. welding a lug boss by negative voltage; 510. a connecting bolt; 520. a first spacer; 600. a battery cell clamp; 700. testing the component; 810. positioning a bolt; 820. a second gasket; 830. positioning a nut; 900. a battery cell to be tested; 910. a battery cell pole column; 920. and (4) a battery cell steel shell.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solutions adopted by the present invention and the technical effects achieved by the present invention clearer, the following will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected", "connected" and "fixed" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

As shown in fig. 1 to fig. 7, the present embodiment provides a cell testing apparatus, which is used for testing a cell 900 to be tested, and includes a clamp module and a connection piece module; the clamp module selectively clamps the battery cell 900 to be tested, and the clamp module forms a clamping groove for accommodating the battery cell 900 to be tested; the connecting piece module comprises a test component 700 and an overcurrent connecting piece and an overvoltage connecting piece which are electrically connected to the test component 700, an overcurrent bending part is bent on the overcurrent connecting piece, the overcurrent bending part extends towards the opening of the clamping groove in the first direction, at least two current welding bosses are bent on the overcurrent bending part respectively, the current welding bosses extend towards the opening of the clamping groove in the second direction and are fixedly connected to the battery cell 900 to be tested, an overvoltage bending part is bent on the overvoltage connecting piece, the overvoltage bending part extends towards the opening of the clamping groove in the first direction, a voltage welding boss is bent at the overvoltage bending part, and the voltage welding boss extends towards the opening of the clamping groove in the second direction and is fixedly connected to the battery cell 900 to be tested.

Preferably, both the current welding boss and the voltage welding boss are ultrasonically welded to the cell 900 to be tested.

This electricity core testing arrangement has optimized connection piece and the connected mode of the electric core 900 that awaits measuring through the institutional advancement to the connection piece module, with the help of between connection piece and the kink and twice the buckling of kink and welding boss, relative position between can effectual adjustment welding boss and the connection piece, and then reduced the connection piece effectively and the degree of difficulty that the electric core 900 that awaits measuring carries out welding operation, reduced the risk of bad welding, promoted welding operation's efficiency. The design of two at least current welding bosss through the mode that converges after carrying out the split with a connection piece that overflows, has avoided ultrasonic bonding head to the excessive extrusion of the electric core 900 that awaits measuring, has reduced the risk of the electric core 900 weeping that awaits measuring. The total overcurrent capacity of the overcurrent connecting piece is unchanged, but the welding difficulty is greatly reduced, so that the test safety performance of the battery cell 900 to be tested is protected from being damaged, the width of a welding area is reduced, the difficulty of ultrasonic welding is reduced, the overcurrent requirement is met, and the hidden danger of the overcurrent connecting piece due to poor overcurrent capacity is avoided. Meanwhile, the arrangement of the clamping groove on the clamp module ensures the positioning effect of the battery cell 900 to be tested, and the accuracy of battery cell testing clamping is improved. The problem that the overcurrent capacity of the battery cell testing device is insufficient is solved through the improvement, and the conditions of poor welding and harsh welding conditions during ultrasonic welding of the connecting sheet are avoided.

Specifically, the battery cell 900 to be tested is a steel shell cylindrical battery cell, and the diameter of the battery cell is 5 cm to 10 cm.

In this embodiment, the battery cell 900 to be tested has a cell post 910 and a cell steel shell 920, and at least a portion of the cell post 910 and the cell steel shell 920 are exposed from the opening of the clamping groove; the overcurrent bend comprises an anode overcurrent connecting piece 100 and a cathode overcurrent connecting piece 300, the anode overcurrent connecting piece 100 is respectively electrically connected with an electric core pole 910 through a first anode current welding boss 130 and a second anode current welding boss 140, the cathode overcurrent connecting piece 300 is respectively electrically connected with an electric core steel shell 920 through a first cathode current welding boss 330 and a second cathode current welding boss 350, the overvoltage bend comprises an anode overvoltage connecting piece 200 and a cathode overvoltage connecting piece 400, the anode overvoltage connecting piece 200 is electrically connected with the electric core pole 910 through an anode voltage welding boss 230, and the cathode overvoltage connecting piece 400 is electrically connected with the electric core steel shell 920 through a cathode voltage welding boss 430. The over-current detection loop and the over-voltage detection loop of the battery cell testing device are embodied in a mode that the positive electrode is electrically connected with the battery cell pole 910, and the negative electrode is connected with the battery cell steel shell 920. The layout of connecting piece module has been optimized in above structural improvement, has ensured that the current detection and the voltage detection to the electric core 900 that awaits measuring can both be accomplished smoothly, has reduced the degree of difficulty of carrying out welding operation on the electric core 900 that awaits measuring by a wide margin, has promoted the efficiency of software testing to the electric core 900 that awaits measuring.

Preferably, the connector block is bolted to the test assembly 700 by a connector bolt 510. Specifically, a first through hole 110 penetrates through the positive overcurrent connecting piece 100, and the connecting bolt 510 penetrates through the first through hole 110 and is screwed to the test assembly 700; the positive overvoltage connecting piece 200 is penetrated with a second through hole 210, and the connecting bolt 510 penetrates through the second through hole 210 and is screwed with the test assembly 700; the negative overcurrent connecting piece 300 is penetrated with a third through hole 310, and a connecting bolt 510 penetrates through the third through hole 310 and is screwed with the test assembly 700; the negative overvoltage connecting piece 400 is penetrated with a fourth through hole 410, and the connecting bolt 510 passes through the fourth through hole 410 and is screwed on the test assembly 700. The connection mode is simple and reliable, accurate and stable connection of the connecting sheets on the test assembly 700 is guaranteed, meanwhile, the connecting sheets are conveniently and electrically connected with the connected test assembly 700, and the test assembly is simple in design structure, low in production cost and convenient to disassemble and assemble.

In this embodiment, the size of each connecting bolt 510 is matched with the corresponding through hole on the connecting piece and the corresponding threaded hole on the test assembly 700, and through the mode of adjusting the size of the through hole and the threaded hole, the foolproof design of the battery cell test device can be realized, so that the risk of errors occurring at the assembling position of the connecting piece is greatly reduced, and the assembling efficiency is improved while the assembling accuracy is greatly improved.

Specifically, a first spacer 520 is interposed between the screw head of the connecting bolt 510 and the connecting piece.

In this embodiment, the cell post 910 and the cell steel shell 920 are located at the same end of the cell 900 to be tested, and the connecting sheet module is divided into a first connecting sheet group and a second connecting sheet group, where the first connecting sheet group and the second connecting sheet group are symmetric with respect to the opening of the clamping slot; the first connecting plate group comprises positive overcurrent connecting plates 100 and positive overvoltage connecting plates 200 which are arranged in parallel at intervals along the third direction, and the second connecting plate group comprises negative overcurrent connecting plates 300 and negative overvoltage connecting plates 400 which are arranged in parallel at intervals along the third direction. Above design has planned the structure of connection piece module, has optimized the overall arrangement of each connection piece, and further the space that this electric core testing arrangement occupy has been reduced, through the design of locating the opening both sides in centre gripping groove with anodal connection piece and negative pole connection piece branch, helps optimizing connection piece and test assembly 700's connected mode.

Specifically, the positive overcurrent connection piece 100, the positive overvoltage connection piece 200, the negative overcurrent connection piece 300 and the negative overvoltage connection piece 400 are located in the same plane and are arranged at intervals, and the space occupied by the connection piece module can be reduced by changing the shape and the position of each connection piece. The shape and position of each connecting piece are determined by those skilled in the art, and the specific optimization mode is common knowledge in the art, which is not described herein in detail.

Further, the first direction is the same as the longitudinal direction of the holding groove. Preferably, any two of the first direction, the second direction and the third direction are perpendicular to each other. Above design is simple reliable, has simplified electric core testing arrangement's structure by a wide margin, has reduced electric core testing arrangement's the welding degree of difficulty and the degree of difficulty of the electric core 900 that awaits measuring of anchor clamps module centre gripping, provides convenient angle for ultrasonic bonding to welding condition has further been improved, the bad risk of welding has been reduced.

Specifically, one end of the positive overcurrent connecting piece 100 is bent downwards to form a first bent part 120, and the first bent part 120 is simultaneously and fixedly connected with a first positive current welding boss 130 and a second positive current welding boss 140 which extend away from the positive overcurrent connecting piece 100; one end of the positive overvoltage connecting piece 200 is bent downwards to form a second bent part 220, and a positive voltage welding boss 230 far away from the positive overvoltage connecting piece 200 is fixedly connected to the second bent part 220; one end of the negative overcurrent connecting piece 300 is bent downwards to form a third bent part 320 and a fourth bent part 340, the third bent part 320 is fixedly connected with a first negative current welding boss 330 extending away from the negative overcurrent connecting piece 300, and the fourth bent part 340 is fixedly connected with a second negative current welding boss 350 extending away from the negative overcurrent connecting piece 300; one end of the negative overvoltage connecting piece 400 is bent downwards to form a fifth bent part 420, and a negative voltage welding boss 430 far away from the negative overvoltage connecting piece 400 is fixedly connected to the fifth bent part 420.

In this embodiment, two test assemblies 700 are provided, one electrically connected to the first connector strip set and the other electrically connected to the second connector strip set. The arrangement of the two test assemblies 700 enables one test assembly 700 to be used as a positive connection terminal to be electrically connected exclusively to the first connection plate set, and the other test assembly 700 to be used as a negative connection terminal to be electrically connected exclusively to the second connection plate set. The design is simple and reliable, the production difficulty is low, the arrangement is convenient, the electric connection and the communication connection with external equipment are easily completed, and the production cost is greatly reduced.

Preferably, the fixture module includes two cell fixtures 600 facing each other, the two cell fixtures 600 respectively clamp two sides of the two test assemblies 700, and the two cell fixtures 600 and the two test assemblies 700 enclose a clamping groove. The structure is simple and reliable, smooth formation of the clamping groove is ensured, and the clamping difficulty of the battery cell 900 to be tested is effectively reduced. Meanwhile, the arrangement mode of the test assembly 700 is effectively planned, so that the opening of the clamping groove is exposed, the welding condition is further improved, and the welding difficulty of the connecting piece module is reduced.

In this embodiment, a plurality of positioning bolts 810 are simultaneously installed on the two electrical core clamps 600, the positioning bolts 810 are screwed with the positioning nuts 830 after penetrating through the two electrical core clamps 600, the electrical core clamps 600 can move along the length direction of the positioning nuts 830, and a second gasket 820 is clamped between the screw heads of the positioning bolts 810 and the electrical core clamps 600.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. An electrical core testing device for testing an electrical core (900) to be tested, comprising:

a clamp module for selectively clamping the battery cell (900) to be tested, wherein the clamp module forms a clamping groove for accommodating the battery cell (900) to be tested;

connection piece module, including test subassembly (700) and electricity connect in overflow connection piece and excessive pressure connection piece on test subassembly (700), it has the kink to overflow to buckle on the connection piece, it moves towards on the first direction to overflow the kink the opening in centre gripping groove extends, it has two at least current welding bosss to buckle respectively to overflow the kink, current welding boss moves towards in the second direction the opening in centre gripping groove extends and the rigid coupling in the electric core (900) that awaits measuring, it has the excessive pressure kink to buckle on the excessive pressure connection piece, the excessive pressure kink moves towards in the first direction the opening in centre gripping groove extends, the excessive pressure kink is buckled and is had voltage welding boss, voltage welding boss moves towards in the second direction the opening in centre gripping groove extends and the rigid coupling in the electric core (900) that awaits measuring.

2. The cell testing device according to claim 1, wherein the cell (900) to be tested has a cell post (910) and a cell steel shell (920), and the cell post (910) and the cell steel shell (920) are at least partially exposed from the opening of the clamping groove; overcurrent kink includes that anodal overcurrent connection piece (100) and negative pole overcurrent connection piece (300), anodal overcurrent connection piece (100) respectively through first anodal current welding boss (130) and second anodal current welding boss (140) with electric core utmost point post (910) electricity is connected, negative pole overcurrent connection piece (300) respectively through first negative pole current welding boss (330) and second negative pole current welding boss (350) with electric core steel casing (920) electricity is connected.

3. The cell testing apparatus of claim 2, wherein the overvoltage bending portion comprises a positive overvoltage connecting piece (200) and a negative overvoltage connecting piece (400), the positive overvoltage connecting piece (200) is electrically connected to the cell post (910) through a positive voltage welding boss (230), and the negative overvoltage connecting piece (400) is electrically connected to the cell steel shell (920) through a negative voltage welding boss (430).

4. The cell testing apparatus of claim 3, wherein the connection tab module is screwed to the testing assembly (700) by means of a connection bolt (510).

5. The cell testing device of claim 3, wherein the current welding boss and the voltage welding boss are both ultrasonically welded to the cell (900) to be tested.

6. The cell testing device of claim 3, wherein the cell pole (910) and the cell steel shell (920) are located at the same end of the cell (900) to be tested, and the connecting sheet module is divided into a first connecting sheet group and a second connecting sheet group, and the first connecting sheet group and the second connecting sheet group are symmetrical with respect to the opening of the clamping groove; the first connecting plate group comprises the positive electrode overcurrent connecting plates (100) and the positive electrode overvoltage connecting plates (200) which are arranged in parallel at intervals along a third direction, and the second connecting plate group comprises the negative electrode overcurrent connecting plates (300) and the negative electrode overvoltage connecting plates (400) which are arranged in parallel at intervals along the third direction.

7. The cell testing device of claim 6, wherein the first direction is the same as a length direction of the clamping slot.

8. The cell testing device of claim 7, wherein any two of the first direction, the second direction, and the third direction are perpendicular to each other.

9. The cell testing device according to any of claims 6 to 8, wherein two testing assemblies (700) are provided, one being electrically connected to the first set of connection tabs and the other being electrically connected to the second set of connection tabs.

10. The cell testing apparatus of claim 9, wherein the clamp module comprises two opposite cell clamps (600), the two cell clamps (600) respectively clamp two sides of the two testing assemblies (700), and the two cell clamps (600) and the two testing assemblies (700) enclose the clamping groove.

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