Battery cell vibration test tool

Abstract

The utility model provides a kind of electric core vibration test tool, belong to battery technical field, including first limit plate, second limit plate, side plate and compression plate, first limit plate and second limit plate enclose and form placing groove, side plate is attached to the outside of second limit plate and with second limit plate enclose and form channel, second limit plate is placed with connecting piece, compression plate is pressed on connecting piece, connecting piece is connected with wire harness in channel;By setting compression plate on positive connecting piece and negative connecting piece, it can better stabilize connecting piece, ensure the fixing strength of connecting piece and positive / negative terminal, avoid that wire harness is pulled during testing process and lead to connecting piece fall off, realize that to be measured electric core is continuously charged and discharged in vibration test process, guarantee test reliability, to be able to meet vibration test under a variety of working conditions, realize joint vibration test under a variety of charge-discharge working conditions, more match and close to the state of electric core in vehicle driving process.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell vibration testing fixture. Background Technology

[0002] Currently, the conventional vibration testing method for battery cells involves vibration at 100% SOC. To better simulate the state of a single battery cell being constrained by surrounding cells and the casing in a vehicle environment, a fixture is usually used for vibration testing. However, this method has the drawback of only being able to simulate vibration at 100% SOC and not the simultaneous charging and discharging conditions. During vehicle operation, there is a continuous discharge process. Furthermore, with the increasing popularity of hybrid electric vehicles (where fuel is burned to convert kinetic energy into electrical energy for battery charging), the vehicle's state during operation is a continuous cycle of discharging-charging-discharging, similar to a driving condition, and the depth of discharge (DOD) is not fixed. However, due to limitations in existing fixtures, it is impossible to achieve a combined charging / discharging and vibration testing scenario. The main reason is that the wiring harness of the charging / discharging equipment is thick and heavy, and the current collector cannot be designed to be very thick due to welding requirements, typically being 1.0mm of aluminum or copper. Vibration testing usually requires prolonged vertical or horizontal vibration, which can easily cause the connecting pieces to detach. Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram showing the connection between the connector and the wire harness. Figure 2 This diagram illustrates the detachment of the connecting piece from the welding position during the cell testing process. Because the positive connecting piece 201 and the negative connecting piece 202 welded to the cell under test 100 are very thin, and the weight of the wire harness 300 differs greatly from the welding strength of the positive connecting piece 201 and the negative connecting piece 202, the connecting piece is easily pulled, causing it to detach from the welding position, resulting in charging interruption and test failure.

[0003] In summary, existing vibration testing methods are limited by tooling limitations and lack diversity, making them unsuitable for testing cell vibration under various combined charge and discharge conditions. This limits their ability to evaluate cell vibration testing performance and prevents them from simulating real-world vehicle driving conditions at the individual cell level. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to solve the problem of the connecting piece falling off due to the pulling of the wire harness during the testing process.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a battery cell vibration testing fixture, including a first limiting plate, a second limiting plate, a side plate and a pressing plate. The first limiting plate and the second limiting plate surround to form a placement groove. The side plate is attached to the outside of the second limiting plate and surrounds the second limiting plate to form a channel. A connecting piece is placed on the second limiting plate. The pressing plate presses on the connecting piece. The connecting piece is connected to the wire harness in the channel.

[0006] Beneficial effects: During vibration testing of the battery cell under test, the connecting piece is very thin, and the weight of the equipment wiring harness and the welding strength of the connecting piece differ greatly. The connecting piece is easily pulled by the thick and heavy wiring harness, causing it to detach from the welding position, resulting in charging interruption and test failure. By setting a side plate, which is attached to the outside of the second limiting plate and forms a channel with the second limiting plate, the wiring harness is placed in the channel, preserving the scenario of simulating the battery cell being surrounded by the shell and the battery cell in the PACK. By setting clamping plates on the positive and negative connecting pieces, the connecting pieces can be better stabilized, ensuring the fixing strength between the connecting pieces and the positive / negative terminals, and preventing the connecting pieces from detaching due to the wiring harness pulling during long-term horizontal and vertical vibration. This makes charge and discharge testing feasible, thus meeting the requirements of joint vibration testing under various working conditions, ensuring test reliability, and more closely matching and closely reflecting the state of the battery cell during vehicle operation.

[0007] Preferably, the two first limiting plates are arranged in parallel, the second limiting plate is perpendicular to the first limiting plate, the two second limiting plates are located between the two first limiting plates, and the outer side of the second limiting plate is flush with the outer side of the first limiting plate.

[0008] Preferably, the placement groove is circular or rectangular; when the placement groove is circular, the end faces of the first limiting plate and the second limiting plate facing the placement groove are concave arc surfaces, and the four arc surfaces enclose the placement groove.

[0009] Beneficial effects: By designing the end faces of the first and second limiting plates facing the placement groove as arc surfaces that fit the shape of the cylindrical battery cell, the stability of the cylindrical battery cell during vibration testing can be improved.

[0010] Preferably, the height of the second limiting plate is greater than the height of the first limiting plate, and the connecting piece is located at the top of the second limiting plate.

[0011] Beneficial effect: By designing the top of the second limiting plate to protrude from the top of the first limiting plate, the top of the second limiting plate serves to support the other end of the connecting piece, thereby improving the stability of the connecting piece placement.

[0012] Preferably, the side plate includes a middle portion and a first mounting portion and a second mounting portion located on both sides of the middle portion. The first mounting portion and the second mounting portion are fixedly connected to the outer side of the first limiting plate, and the middle portion is attached to the outer side of the second limiting plate.

[0013] Beneficial effects: By fixing the wire harness to the side of the first limiting plate at the two mounting parts on the side plate, the wire harness can be placed directly in the hole of the side plate, eliminating the tedious work of fixing the wire harness with nuts, and also retaining the scenario of the battery cell being surrounded by the housing and battery cell in the PACK.

[0014] Preferably, the side plate is H-shaped, with a gap between the ends of the first mounting part and the second mounting part, and the wire harness located in the gap is exposed; the end of the wire harness connected to the connecting piece is bent.

[0015] Beneficial effects: By leaving a gap between the ends of the first mounting part and the second mounting part, space is provided for the wire harness to bend and run; by designing the end of the wire harness connected to the connecting piece to be curved, sufficient extension margin can be provided for the wire harness, and the connecting piece can be prevented from being pulled by excessive traction force during vibration.

[0016] Preferably, the channel is formed by the groove on the side plate or the second limiting plate, or by the groove on the side plate and the groove on the second limiting plate, and the channel is wavy.

[0017] Beneficial effects: By setting the channel to a wavy shape, which conforms to the bending shape of the wire harness itself, the wire harness can be fixed more stably, the traction force can be distributed, and the stability of the wire harness during vibration can be guaranteed.

[0018] Preferably, the clamping plate is U-shaped, with both ends of the clamping plate fixedly installed on the top of the first limiting plate, and the U-shaped opening facing the connecting piece.

[0019] Preferably, it also includes a base plate and a pressure block, with the first limiting plate and the second limiting plate both fixed on the base plate, the other end of the wire harness located on the base plate, and the pressure block pressing on the wire harness.

[0020] Beneficial effects: By setting a base plate, the battery cell under test, the first limiting plate, and the second limiting plate are placed on the base plate, which can strengthen the entire battery cell vibration test fixture; pressing the pressure block on the wire harness on the base plate can strengthen the extended wire harness, thereby ensuring the stability and test reliability of the entire fixture for the wire harness and connecting piece connection.

[0021] Preferably, the connecting piece includes a positive connecting piece and a negative connecting piece. One end of the positive connecting piece is connected to the positive terminal of the battery cell under test in the placement slot, and one end of the negative connecting piece is connected to the negative terminal of the battery cell under test in the placement slot. The other end of the positive connecting piece is connected to a wire harness, and the other end of the negative connecting piece is connected to another wire harness. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the connection between the connector and the wire harness; Figure 2This is a schematic diagram showing the connector detaching from the soldering position during the cell testing process. Figure 3 A schematic diagram of the cell vibration testing fixture provided in an embodiment of this utility model; Figure 4 A perspective view of the side plate in the cell vibration testing fixture provided in this embodiment of the utility model; Figure 5 This is a front view of the side plate of the cell vibration testing fixture provided in an embodiment of the present invention; In the diagram: 10 First limiting plate, 20 Second limiting plate, 30 Side plate, 31 Hole, 32 First mounting part, 33 Middle part, 34 Second mounting part, 40 Pressing plate, 50 Base plate, 60 Pressing block, 100 Battery cell under test, 201 Positive connecting piece, 202 Negative connecting piece, 300 Wiring harness. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0024] like Figure 3 As shown, this embodiment provides a battery cell vibration testing fixture for battery cell vibration testing. It includes a first limiting plate 10, a second limiting plate 20, a side plate 30, and a pressing plate 40. The two first limiting plates 10 and the two second limiting plates 20 surround each other to form a placement groove. The side plate 30 is attached to the outside of the second limiting plate 20 and surrounds the second limiting plate 20 to form a channel 31. A connecting piece is placed on the second limiting plate 20, and the pressing plate 40 presses on the connecting piece. The connecting piece is connected to the wire harness 300 in the channel 31.

[0025] The first limiting plate 10 and the second limiting plate 20 can be fixedly installed using bolt assemblies. The placement slot is used to place the battery cell to be tested. The battery cell can be a cylindrical cell or a prismatic cell. When testing a cylindrical cell, the placement slot is circular. The end faces of the first limiting plate 10 and the second limiting plate 20 facing the placement slot are designed as inwardly concave arc surfaces, which are adapted to the shape of the cylindrical cell. The four arc surfaces form a circular placement slot. When testing a prismatic cell, the two first limiting plates 10 and the two second limiting plates 20 are directly enclosed. The specific enclosure method is as follows: two first limiting plates 10 are placed parallel to each other, with a distance reserved between them for placing a second limiting plate 20. That is, the distance between the two first limiting plates 10 is equal to the width of the second limiting plate 20, effectively sandwiching the two second limiting plates 20 between the two first limiting plates 10. The two second limiting plates 20 are also placed parallel to each other. After the two first limiting plates 10 and two second limiting plates 20 are installed, the outer surface of the second limiting plate 20 is flush with the outer surface of the first limiting plate 10. By designing the end faces of the first limiting plates 10 and the second limiting plates 20 facing the placement groove as arc surfaces adapted to the shape of the cylindrical battery cell, the stability of the cylindrical battery cell during vibration testing can be improved.

[0026] The height of the second limiting plate 20 is greater than the height of the first limiting plate 10, and the connecting piece is located on top of the second limiting plate 20. When the battery cell under test is placed in the placement slot for testing, the top of the battery cell is higher than the top of the first limiting plate 10, and one end of the connecting piece is connected to the battery cell. By designing the top of the second limiting plate 20 to protrude from the top of the first limiting plate 10, the top of the second limiting plate 20 serves to support the other end of the connecting piece, thereby improving the stability of the connecting piece placement.

[0027] See Figure 4 The side plate 30 includes a central portion 33 and a first mounting portion 32 and a second mounting portion 34 located on both sides of the central portion 33. The first mounting portion 32 and the second mounting portion 34 are fixedly connected to the outer side of the first limiting plate 10, and the central portion 33 is fitted against the outer side of the second limiting plate 20. During installation, mounting holes are respectively opened at both ends of the first mounting portion 32 and the second mounting portion 34. Mounting holes are also opened on the side of the first limiting plate 10 at positions corresponding to the first mounting portion 32 and the second mounting portion 34. A bolt assembly can be used to fix the side plate 30 to the side of the first limiting plate 10. By fixing the side plate 30 to the side of the first limiting plate 10 through the two mounting portions, the wire harness 300 is directly placed in the hole 31 of the side plate 30, eliminating the cumbersome work of fixing the wire harness with nuts, and retaining the scenario where the battery cell is surrounded by the casing and the battery cell within the PACK.

[0028] See Figure 5The side plate 30 is H-shaped. The first mounting part 32 and the second mounting part 34 have the same length L, and the length L of the first mounting part 32 is greater than the length L1 of the middle part 33. This creates a gap between the ends of the first mounting part 32 and the second mounting part 34. The length L2 of this gap is equal to half the difference between the length L of the first mounting part 32 and the length L1 of the middle part 33. The wire harness 300 located in the gap is exposed. The end of the wire harness 300 connected to the connecting piece is bent. By leaving a gap between the ends of the first mounting part 32 and the second mounting part 34, space is provided for the wire harness 300 to bend and run, especially at the position where the wire harness connects to the connecting piece. Since the wire harness of the charging and discharging device is thick and heavy, the connecting piece cannot be designed to be very thick. During the vibration test of the battery cell, the wire harness is very easy to pull the connecting piece, which can easily lead to charging interruption. By designing the end of the wire harness 300 connected to the connecting piece to be bent, sufficient extension margin can be provided for the wire harness, avoiding the wire harness pulling the connecting piece due to excessive traction during vibration.

[0029] The channel 31 is formed by the groove on the side plate 30 or the second limiting plate 20, or by the groove on the side plate 30 and the groove on the second limiting plate 20. This utility model describes the channel 31 using the example of the channel 31 being formed on the side plate 30. See [link to relevant documentation]. Figure 4 and Figure 5 The channel 31 is wavy. The number and size of the waves are designed according to the length L and width B of the side plate 30. It can be designed as one large wave or two small waves. If the length L of the side plate 30 is large, the number of wavy waves can be set more; if the length L of the side plate 30 is small, the number of wavy waves can be set less. If the width B is large, the wave height h can be set larger; if the width B is small, the wave height h can be set smaller. The angle of each wave... The angle can be acute or obtuse. By setting the channel to a wavy shape, which conforms to the bending shape of the wire harness itself, the wire harness can be fixed more stably, the traction force can be distributed, and the stability of the wire harness during vibration can be ensured. The diameter r of the channel 31 is determined according to the model and size of the wire harness 300, ensuring a redundancy of 2mm.

[0030] Continue reading Figure 3 The clamping plate 40 is U-shaped, with both ends fixedly installed on the top of the first limiting plate 10, and the U-shaped opening facing the connecting piece. For specific installation, mounting holes can be made at both ends of the clamping plate 40, and bolt assemblies can be used to fix the clamping plate 40 to the top of the first limiting plate 10. By pressing the clamping plate 40 onto the connecting piece, the connecting piece can be more securely fixed, ensuring the fixing strength between the connecting piece and the positive / negative terminals, and preventing the connecting piece from falling off due to wire harness pulling during testing.

[0031] See also Figure 3The cell vibration testing fixture also includes a base plate 50 and a pressure block 60. The first limiting plate 10 and the second limiting plate 20 are both fixed to the base plate 50. The other end of the wire harness 300 is located on the base plate 50, and the pressure block 60 presses down on the wire harness 300. By setting the base plate 50, the cell under test, along with the first limiting plate 10 and the second limiting plate 20, are placed on the base plate 50, which strengthens the entire cell vibration testing fixture. Pressing the pressure block 60 onto the wire harness on the base plate 50 strengthens the extended wire harness, thereby ensuring the stability and testing reliability of the entire fixture for the wire harness and connecting pieces.

[0032] The connecting piece includes a positive connecting piece 201 and a negative connecting piece 202. One end of the positive connecting piece 201 is connected to the positive terminal of the battery cell under test in the placement slot, and one end of the negative connecting piece 202 is connected to the negative terminal of the battery cell under test in the placement slot. The other end of the positive connecting piece 201 is connected to a wire harness 300, and the other end of the negative connecting piece 202 is connected to another wire harness 300.

[0033] Working Principle: In practical application, the cell vibration testing fixture of this utility model first fixes and installs a first limiting plate 10 and a second limiting plate 20. The two first limiting plates 10 are parallel, and the two second limiting plates 20 are parallel and perpendicular to each other. The two second limiting plates 20 are sandwiched between the two first limiting plates 10, and the outer surface of the second limiting plate 20 is flush with the outer surface of the first limiting plate 10. One end of the positive connecting piece 201 is connected to the positive terminal of the cell 100 under test, and one end of the negative connecting piece 202 is connected to the negative terminal of the cell 100 under test. The cell 100 under test, together with the positive connecting piece 201 and the negative connecting piece 202, is placed in the placement groove. The other end of the positive connecting piece 201 overlaps the top of one of the second limiting plates 20, and the other end of the negative connecting piece 202... The other end of the plate 202 overlaps the top of another second limiting plate 20. A clamping plate 40 is pressed on the positive connecting plate 201, and another clamping plate 40 is pressed on the negative connecting plate 202. The other end of the positive connecting plate 201 is connected to one end of a wire harness 300, and the other end of the negative connecting plate 202 is connected to one end of another wire harness 300. The two wire harnesses 300 are placed in the holes 31 of the side plate 30 respectively. The wavy holes 31 conform to the bending shape of the wire harnesses 300. The end of the wire harness 300 connected to the connecting plate is bent and exposed. The side plate 30 is fixedly installed on the side of the first limiting plate 10. The wire harnesses 300 extending from the holes 31 are laid on the upper surface of the base plate 50, and the pressure block 60 is pressed on the wire harnesses 300 to further reinforce the wire harnesses 300.

[0034] During vibration testing of the battery cell under test, the positive connecting piece 201 and the negative connecting piece 202 are very thin. The weight of the wiring harness and the welding strength of the connecting pieces differ greatly, making the connecting pieces easily pulled by the thick and heavy wiring harness 300. This can cause the connecting pieces to detach from the welding position, leading to charging interruption and test failure, thus preventing the implementation of vibration testing under multiple operating conditions such as simultaneous charging and discharging. By setting clamping plates 40 on the positive connecting piece 201 and the negative connecting piece 202, the connecting pieces can be better secured, ensuring the fixing strength between the connecting pieces and the positive / negative terminals. This prevents the connecting pieces from detaching due to wiring harness pulling during prolonged left-right and up-down vibrations, thus enabling the feasibility of charge-discharge testing and meeting the requirements for combined vibration testing under multiple operating conditions, ensuring test reliability. By setting the side plate 30 and placing the wiring harness 300 within the channel 31, the cumbersome work of fixing the wiring harness with nuts is eliminated, while still preserving the scenario of the battery cell being surrounded by the casing and the battery cell within the PACK.

[0035] This utility model's cell vibration testing fixture can meet vibration testing requirements under various operating conditions, enabling combined vibration testing under multiple charge and discharge conditions, and better matching and closely resembling the state of the cell during vehicle operation. Under any vibration testing method, it can simulate the real state of the cell under test within a vehicle, solving the problem of current single-mode cell vibration testing. This allows for a comprehensive evaluation of the vibration performance and mechanical safety of the cell under test under combined operating conditions, providing significant reference value for ensuring cell safety, PACK safety, vehicle safety, and simulation design.

[0036] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell vibration testing fixture, characterized in that: It includes a first limiting plate, a second limiting plate, a side plate, and a pressing plate. The first limiting plate and the second limiting plate surround each other to form a placement groove. The side plate is attached to the outside of the second limiting plate and surrounds the second limiting plate to form a channel. A connecting piece is placed on the second limiting plate. The pressing plate presses on the connecting piece. The connecting piece is connected to the wire harness in the channel.

2. The cell vibration testing fixture according to claim 1, characterized in that: Two first limiting plates are arranged in parallel, and a second limiting plate is perpendicular to the first limiting plate. The two second limiting plates are located between the two first limiting plates, and the outer side of the second limiting plate is flush with the outer side of the first limiting plate.

3. The cell vibration testing fixture according to claim 1, characterized in that: The placement groove is circular or rectangular; when the placement groove is circular, the end faces of the first limiting plate and the second limiting plate facing the placement groove are concave arc surfaces, and the four arc surfaces enclose the placement groove.

4. The cell vibration testing fixture according to claim 1, characterized in that: The height of the second limiting plate is greater than the height of the first limiting plate, and the connecting piece is located on top of the second limiting plate.

5. The cell vibration testing fixture according to claim 1, characterized in that: The side plate includes a middle part and a first mounting part and a second mounting part located on both sides of the middle part. The first mounting part and the second mounting part are fixedly connected to the outer side of the first limiting plate, and the middle part is attached to the outer side of the second limiting plate.

6. The cell vibration testing fixture according to claim 5, characterized in that: The side panel is H-shaped, with a gap between the ends of the first mounting part and the second mounting part, where the wire harness is exposed; the end of the wire harness connected to the connecting piece is bent.

7. The cell vibration testing fixture according to claim 1, characterized in that: The channel is formed by the groove on the side plate or the second limiting plate, or by the groove on the side plate and the groove on the second limiting plate. The channel is wavy.

8. The cell vibration testing fixture according to claim 1, characterized in that: The clamping plate is U-shaped, with both ends fixedly installed on the top of the first limiting plate, and the U-shaped opening facing the connecting piece.

9. The cell vibration testing fixture according to claim 1, characterized in that: It also includes a base plate and a pressure block. The first and second limiting plates are both fixed on the base plate, the wire harness is located on the base plate, and the pressure block presses on the wire harness.

10. The cell vibration testing fixture according to claim 1, characterized in that: The connecting piece includes a positive connecting piece and a negative connecting piece. One end of the positive connecting piece is connected to the positive terminal of the battery cell under test in the placement slot, and one end of the negative connecting piece is connected to the negative terminal of the battery cell under test in the placement slot. The other end of the positive connecting piece is connected to a wire harness, and the other end of the negative connecting piece is connected to another wire harness.

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