Zero clearing tool for kelvin clip-on battery impedance tester

Abstract

The utility model provides a kelvin clamp formula battery impedance tester is with zeroing tool, including zeroing tool upper layer board, zeroing tool middle layer board and zeroing tool lower layer board, zeroing tool upper layer board with zeroing tool lower layer board is fixed respectively in the both sides of zeroing tool middle layer board, all seted up clamping groove on zeroing tool upper layer board with zeroing tool lower layer board, the both sides of zeroing tool middle layer board all are equipped with the copper foil of cooperation with clamping groove. The utility model has the beneficial effect such as following, the utility model identifies the sum of these non - measured product impedances after instrument access, makes the tester reach the state of approaching 0 omega when kelvin clamp short - circuit through zeroing calibration, thereby peeling off interference, measures the real impedance of battery.

Description

Technical Field

[0001] This utility model is a zeroing fixture for a Kelvin clip-on battery impedance tester, belonging to the field of battery impedance testing technology. Background Technology

[0002] Currently, in the field of battery impedance testing, existing zeroing fixtures are only suitable for probe rods. If Kelvin clips are used for zeroing, two Kelvin clips can only be shorted together in a certain way for zeroing. Since the position of the test leads when the Kelvin clips are shorted for zeroing is inconsistent with the actual position during testing, any changes in the position of the test leads before and after zeroing (such as bending or moving closer to other cables) will directly change the parasitic inductance and parasitic capacitance. Therefore, directly shorting the Kelvin clips for zeroing has certain limitations.

[0003] When a battery impedance tester measures the sample, the internal circuit impedance, test lead impedance, and contact impedance (such as the contact resistance between the Kelvin clip and the battery tab) are superimposed on the actual battery impedance, resulting in a measured value that is too large or even exceeds the tolerance.

[0004] This utility model provides a zeroing fixture for a Kelvin clip-on battery impedance tester. After the instrument is connected, it identifies the sum of the impedances of these non-tested items. Through zeroing calibration, the tester reaches a state close to 0Ω when the Kelvin clip is short-circuited, thereby eliminating interference and measuring the true impedance of the battery. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a zeroing fixture for a Kelvin clip-on battery impedance tester.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A zeroing fixture for a Kelvin clip-on battery impedance tester includes an upper zeroing fixture plate, a middle zeroing fixture plate, and a lower zeroing fixture plate. The upper and lower zeroing fixture plates are respectively fixed to both sides of the middle zeroing fixture plate. Each of the upper and lower zeroing fixture plates has a clamping groove. Copper foils that mate with the clamping grooves are installed on both sides of the middle zeroing fixture plate.

[0008] Furthermore, the upper plate, the middle plate, and the lower plate of the zeroing fixture are connected and fixed together by screws, and each of the three plates has screw holes that cooperate with the screws.

[0009] Furthermore, both the upper and lower plates of the zeroing fixture are provided with scales on their outer surfaces, and the scales correspond to the clamping grooves.

[0010] Furthermore, the clamping groove has a serrated structure and is adapted to the clamp of the Kelvin clamp.

[0011] Furthermore, the Kelvin clip includes a clamping head and a handle, the clamping head being made of metal and the handle being made of insulating material.

[0012] The beneficial effects of this utility model are:

[0013] This utility model uses a zeroing fixture consisting of an upper plate, a middle plate, and a lower plate to form a fixture. The serrated clamping groove is adapted to the copper foil to ensure that the contact area and test position of the Kelvin clamp contacts are completely consistent during working zeroing and actual battery testing.

[0014] The intermediate layer of the zeroing fixture of this utility model can achieve S+S- and D+D- connection through circuit wiring, and then achieve S+S-D+D- short circuit through vias.

[0015] The interface of this zeroing fixture is perfectly matched with the test position of the battery (such as the distance between the tabs and the clamping method), which enables the tester to accurately identify the impedance of non-tested items. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the zeroing fixture for a Kelvin clip-on battery impedance tester according to this utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the zeroing fixture for a Kelvin clip-on battery impedance tester according to this utility model. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the Kelvin clip structure of a zeroing fixture for a Kelvin clip-type battery impedance tester according to the present invention.

[0020] In the diagram: 1. Upper plate of the zeroing fixture; 2. Middle plate of the zeroing fixture; 3. Lower plate of the zeroing fixture; 4. Copper foil; 5. Screw hole; 6. Clamping slot; 7. Kelvin clamp; 8. Chuck part; 9. Handle part; 10. Scale. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1-2 This utility model provides a zeroing fixture technical solution for a Kelvin clip-on battery impedance tester, including an upper zeroing fixture plate 1, a middle zeroing fixture plate 2, and a lower zeroing fixture plate 3. The upper zeroing fixture plate 1 and the lower zeroing fixture plate 3 are respectively fixed to both sides of the middle zeroing fixture plate 2. The upper zeroing fixture plate 1, the middle zeroing fixture plate 2, and the lower zeroing fixture plate 3 are connected and fixed together by screws. The intermediate layer plate 2 and the lower layer plate 3 of the zeroing fixture are all provided with screw holes 5 that mate with the screws. The upper layer plate 1 and the lower layer plate 3 of the zeroing fixture are both provided with clamping grooves 6. This ensures that there are 32 copper foil contact points on the upper and lower parts of the fixture with the same area as the clamping part 8 of the Kelvin clip 7, so that the contact area between the Kelvin clip 7 and the fixture is completely consistent with the contact area between the Kelvin clip and the battery tab. Copper foil 4 that mates with the clamping grooves 6 is installed on both sides of the intermediate layer plate 2 of the zeroing fixture.

[0023] See Figures 1-2 Both the upper plate 1 and the lower plate 3 of the zeroing fixture are provided with scales 10 on their outer surfaces. The scales 10 correspond to the clamping grooves 6 to ensure that the distance between the two Kelvin clips 7 is completely consistent with the distance between the battery tabs.

[0024] See Figures 2-3 The clamping groove 6 has a serrated structure and is adapted to the clamp of the Kelvin clip 7. The Kelvin clip 7 includes a clamping head part 8 and a handle part 9. The clamping head part 8 is made of metal to ensure effective transmission of current and voltage signals, and the handle part 9 is made of insulating material to avoid dangers such as electric shock.

[0025] The key to zeroing calibration is that the connection state during zeroing must be exactly the same as when actually testing the battery (including the position of the test leads and the contact area of ​​the Kelvin clip contacts). Only in this way can the sum of the impedances of the non-tested components identified by the tester be the true interference of the actual test. However, when the Kelvin clip 7 is shorted to zero, the position of the test leads is inconsistent with the actual test position, therefore the impedance of the non-tested components identified by the tester is inaccurate.

[0026] To address the shortcomings, this invention improves upon the original zeroing and shorting method by making the interface (clamping slot 6) of the zeroing fixture perfectly match the test position of the battery (such as the distance between the tabs and the clamping method), enabling the tester to accurately identify the impedance of non-tested products.

[0027] Zeroing calibration essentially allows the tester to recognize and memorize the remaining impedances along the test path. These impedances are then subtracted from the total measured value during subsequent tests to obtain the battery's true impedance. (Refer to the previous step: Directly short-circuit the Kelvin clip.) Figure 3 While it may seem to simulate a 0Ω state, it cannot compensate for the parasitic capacitance and inductance generated by the test cable and the Kelvin clip itself. This is because shorting the Kelvin clip itself introduces new parasitic parameters that the tester cannot distinguish, resulting in measurement results that deviate significantly from the true value.

[0028] The zeroing tooling in this application (reference) Figure 1-2 It has an extremely low impedance short-circuit path inside. The tester can accurately identify the total parasitic parameters of the internal circuit, cables and Kelvin clips through the zeroing tool. In subsequent tests, targeted compensation can be made to ensure the accuracy of the test results.

[0029] This invention cannot be used independently; it must be used in conjunction with Kelvin clip-on test leads. (The Kelvin clip is described in the original text.) Figure 3 As shown, there are two Kelvin clips 7, one positive and one negative, with identical structures. Then, the position of the Kelvin clips connected to the battery is simulated by the zeroing fixture. The upper plate 1 and the lower plate 3 of the zeroing fixture are marked with dimensions to ensure that the distance between the two Kelvin clips is completely consistent with the distance between the battery tabs. After the three-layer PCB board is assembled, there are 32 copper foil contact points on the top and bottom of the fixture with the same area as the clamping part 8 of the Kelvin clip 7, ensuring that the contact area between the Kelvin clips and the fixture is completely consistent with the contact area between the Kelvin clips and the battery tabs.

[0030] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A zeroing fixture for a Kelvin clip-on battery impedance tester, characterized in that, The fixture includes an upper plate (1), a middle plate (2), and a lower plate (3). The upper plate (1) and the lower plate (3) are fixed to both sides of the middle plate (2). Both the upper plate (1) and the lower plate (3) are provided with clamping grooves (6). Copper foils (4) that cooperate with the clamping grooves (6) are installed on both sides of the middle plate (2).

2. The zeroing fixture for a Kelvin clip-on battery impedance tester according to claim 1, characterized in that, The upper plate (1), the middle plate (2), and the lower plate (3) of the zeroing fixture are connected and fixed by screws. Each of the three plates has a screw hole (5) that matches the screw.

3. The zeroing fixture for a Kelvin clip-on battery impedance tester according to claim 2, characterized in that, Both the upper plate (1) and the lower plate (3) of the zeroing fixture are provided with scales (10) on their outer surfaces, and the scales (10) correspond to the clamping grooves (6).

4. The zeroing fixture for a Kelvin clip-on battery impedance tester according to claim 3, characterized in that, The clamping groove (6) has a serrated structure and is adapted to the clamp of the Kelvin clamp (7).

5. The zeroing fixture for a Kelvin clip-on battery impedance tester according to claim 4, characterized in that, The Kelvin clip (7) includes a clamping head (8) and a handle (9). The clamping head (8) is made of metal, and the handle (9) is made of insulating material.

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