Battery internal resistance test fixture

Abstract

The utility model discloses a battery internal resistance test fixture. The battery internal resistance test fixture comprises a base, a support body, a first clamping block and a second clamping block, wherein the support body is used for placing a battery and supporting the placed battery; and the first clamping block and the second clamping block are oppositely arranged on the base at intervals and are used for clamping test needles. The first clamping block can be adjusted to be close to or away from the position of the second clamping block, the first clamping block is provided with a first clamping station and a second clamping station which are separated from each other and used for clamping the test needle, and the second clamping block is provided with a third clamping station used for clamping the test needle. The supporting body is located between the first clamping block and the second clamping block in the spaced arrangement direction of the first clamping block and the second clamping block. The battery internal resistance test clamp can meet the test clamping requirements of batteries with the same type of positive and negative electrodes on the same side and different sides.

Description

Technical Field

[0001] The utility model relates to a fixture used for clamping a secondary battery (such as a lithium battery) to be tested, in particular to a battery internal resistance testing fixture. Background Art

[0002] With the vigorous development of the new energy industry, a huge market is provided for the battery industry, thereby accelerating the pace of development of the battery industry.

[0003] At present, lithium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their advantages such as high energy density, high charge and discharge rate, and good capacity consistency. Among them, the full collector ear / collector plate structure can reduce the internal resistance of the battery, and is identified by more and more manufacturers as the preferred direction of cylindrical battery structure.

[0004] In existing cylindrical batteries, due to the large differences in battery size and many structural changes, there are situations where the positive and negative electrodes in the battery are located on the same side or on different sides. In addition, the internal resistance of cylindrical batteries is getting smaller and smaller, and the testing requirements are getting higher and higher. In addition, the internal resistance of cylindrical batteries is mainly composed of cover plates, welds, current collectors, winding cores and steel shells. Therefore, when considering the influence of cover plates, welds, current collectors, winding cores and steel shells on the overall resistance, it is necessary to measure the cover plates, welds, current collectors, winding cores and steel shells separately, so the use of fixtures is indispensable.

[0005] However, the existing fixture is not compatible with the clamping requirements for different battery tests.

[0006] Therefore, there is an urgent need for a battery internal resistance test fixture to overcome the above-mentioned defects. Utility Model Content

[0007] The utility model aims to provide a battery internal resistance test fixture, which can meet the test clamping requirements of batteries of the same type with positive and negative electrodes on the same side or on different sides.

[0008] To achieve the above-mentioned purpose, the battery internal resistance test fixture of the utility model comprises a base, a support body for placing the battery and supporting the placed battery, and a first clamping block and a second clamping block arranged in a relative spaced relationship on the base and used to clamp the test needle. The first clamping block can be adjusted to move closer to or farther from the second clamping block, the first clamping block is provided with a first clamping station and a second clamping station separated from each other and each used to clamp the test needle, the second clamping block is provided with a third clamping station for clamping the test needle, and the support body is located between the first clamping block and the second clamping block along the spaced arrangement direction of the first clamping block and the second clamping block.

[0009] Compared with the prior art, the first clamping block can be adjusted relative to the second clamping block, so that the battery internal resistance test fixture of the utility model can match the same type of batteries with positive and negative electrodes on the same side and different sides. Since the first clamping block is provided with a first clamping station and a second clamping station, and the second clamping block is provided with a third clamping station; therefore, when testing and clamping the battery whose positive and negative electrodes are not on the same side, at this time, through the cooperation of the test needle on the first clamping station or the second clamping station and the test needle on the third clamping station, the battery test clamping needs of the positive and negative electrodes supported by the support body on the same side can be realized; when testing and clamping the battery with the positive and negative electrodes on the same side, at this time, through the cooperation of the test needles on the first clamping station and the second clamping station, the battery test clamping needs of the positive and negative electrodes supported by the support body on the same side can be realized. Since the battery contacts the test needle under the support of the support body, it is ensured that the battery is tested in a stable condition.

[0010] Preferably, the battery internal resistance testing fixture of the present invention also includes an adjusting bolt, the first clamping block is slidably disposed on the base, an internal thread structure is provided on the base, the first clamping block is arranged opposite to the internal thread structure on the side facing away from the support body, the adjusting bolt passes through the internal thread structure and is threadedly connected to the internal thread structure, one end of the adjusting bolt is rotatably assembled with the first clamping block, and an operating handle is provided on the other end of the adjusting bolt.

[0011] Preferably, a slide groove extending along the spaced arrangement direction is provided on the base, and an embedded protrusion which is matchedly placed in the slide groove and can slide along the slide groove is provided at the bottom of the first clamping block.

[0012] Preferably, the first clamping station includes a first pressing block and a first through groove penetrating the first clamping block along the spacing arrangement direction, the first through groove also penetrating the side wall of the first clamping block adjacent to or opposite to the base to form a first notch, and the first pressing block is assembled on the side wall and closes the first notch; the second clamping station includes a second pressing block and a second through groove penetrating the first clamping block along the spacing arrangement direction, the second through groove also penetrating the side wall of the first clamping block adjacent to or opposite to the base to form a second notch, and the second pressing block is assembled on the side wall and closes the second notch.

[0013] Preferably, a first convex block protrudes from the first pressing block and is embedded in the first through groove, and a second convex block protrudes from the second pressing block and is embedded in the second through groove.

[0014] Preferably, the first protrusion has an arc-shaped first embracing structure, which is arranged opposite to the bottom wall of the first through groove; the second protrusion has an arc-shaped second embracing structure, which is arranged opposite to the bottom wall of the second through groove.

[0015] Preferably, the battery internal resistance testing fixture of the present invention also includes a first rubber pad respectively arranged on two opposite sides of the first notch and a second rubber pad respectively arranged on two opposite sides of the second notch, the first rubber pad is located between the first top pressure block and the first clamping block, a first locking screw passes through the first top pressure block and the first rubber pad and is then threadedly connected to the first clamping block, the second rubber pad is located between the second top pressure block and the first clamping block, a second locking screw passes through the second top pressure block and the second rubber pad and is then threadedly connected to the first clamping block.

[0016] Preferably, the third clamping station includes a third pressing block and a third through groove passing through the second clamping block along the spaced arrangement direction, the third through groove also passing through the side wall of the second clamping block adjacent to or opposite to the base to form a third slot, and the third pressing block is assembled on the side wall and closes the third slot.

[0017] Preferably, the battery internal resistance testing fixture of the present invention also includes third rubber pads respectively arranged beside the opposite sides of the third notch, the third rubber pads are located between the third top pressure block and the second clamping block, a third locking screw passes through the third top pressure block and the third rubber pad and is then threadedly connected to the second clamping block; the third top pressure block is protruding with a third protrusion embedded in the third through groove, the third protrusion has an arc-shaped third embracing structure, and the bottom wall of the third through groove is arranged facing the third embracing structure.

[0018] Preferably, the base is provided with a plurality of fixing grooves spaced from each other along the spacing arrangement direction, the bottoms of the support body and the second clamping block are each provided with a positioning protrusion for engaging with the fixing grooves, and the top of the support body has an arc-shaped supporting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a stereoscopic diagram of the battery internal resistance test fixture of the utility model.

[0020] Figure 2 yes Figure 1 The battery internal resistance test fixture is shown in a plan view along the direction indicated by arrow B.

[0021] Figure 3 yes Figure 1 The three-dimensional exploded view of the battery internal resistance test fixture is shown.

[0022] Figure 4 yes Figure 3 A three-dimensional exploded view from another angle.

[0023] Figure 5 It is a stereoscopic diagram of the first clamping block in the battery internal resistance test fixture of the utility model.

[0024] Figure 6 yes Figure 5 A perspective exploded view of the first clamping block is shown.

[0025] Figure 7 It is a stereoscopic diagram of the second clamping block in the battery internal resistance test fixture of the utility model.

[0026] Figure 8 yes Figure 7 A perspective exploded view of the second clamping block is shown.

[0027] Fig. 9 The utility model is a state diagram showing the battery internal resistance test fixture of the present invention testing and clamping the battery with the positive and negative electrodes on different sides.

[0028] Fig.10 The figure shows the state of the battery internal resistance test fixture of the utility model testing and clamping the battery with the positive and negative electrodes on the same side. DETAILED DESCRIPTION

[0029] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.

[0030] See also Figures 1 to 4 and Fig. 9 The battery internal resistance test fixture 100 of the utility model includes a base 10, a support body 20 for placing a battery 200 and supporting the placed battery 200, and a first clamping block 30 and a second clamping block 40 which are arranged relatively and spaced apart on the base 10 and are used to clamp a test needle. The first clamping block 30 can be adjusted to be close to or away from the second clamping block 40 to meet the need for the first clamping block 30 to be adjusted relative to the second clamping block 40; in addition, the first clamping block 30 is provided with a first clamping station 31 and a second clamping station 32 which are separated from each other and are each used to clamp a test needle. The second clamping block 40 is provided with a third clamping station 41 for clamping a test needle. The support body 20 is located between the first clamping block 30 and the second clamping block 40 along the spaced arrangement direction of the first clamping block 30 and the second clamping block 40 (see the direction indicated by arrow A). Specifically, combined with Fig.10As an example, in order to distinguish the test needles clamped by the first clamping station 31, the second clamping station 32 and the third clamping station 41, the test needle clamped by the first clamping station 31 is named as the first test needle 310, the test needle clamped by the second clamping station 32 is named as the second test needle 320, and the test needle clamped by the third clamping station 41 is named as the third test needle 330; optionally, the first test needle 310, the second test needle 320 and the third test needle 330 are all probes, so that the first test needle 310, the second test needle 320 and the third test needle 330 all have a telescopic function, thereby improving the reliability of the first test needle 310, the second test needle 320 and the third test needle 330 to maintain a close contact with the battery 200 during testing; obviously, according to actual needs, the first test needle 310, the second test needle 320 and the third test needle 330 can also be other needles besides the probes; in addition, Figure 1 and Figure 2 As an example, the first clamping block 30, the second clamping block 40 and the support body 20 all protrude from the base 10 from the same side of the base 10, for example but not limited to Figure 1 and Figure 2 The upper side of the base 10 is shown. More specifically, as follows:

[0031] like Figures 1 to 4 ,as well as Figures 9 and 10 As shown, as an example, the battery internal resistance test fixture 100 of the utility model further includes an adjusting bolt 50, a first clamping block 30 is slidably disposed on the base 10, and the base 10 is provided with an internal thread structure 11, and the first clamping block 30 is opposite to the side of the support body 20 (for example Figures 1 to 4 as well as Figures 9 and 10 The right side of the first clamping block 30 in the figure) is arranged opposite to the internal thread structure 11 to meet the need that the support body 20 and the internal thread structure 11 are distributed on opposite sides of the first clamping block 30. At this time, the adjusting bolt 50 passes through the internal thread structure 11 and is threadedly connected to the internal thread structure 11. One end of the adjusting bolt 50 is rotatably assembled and connected to the first clamping block 30 to meet the need for the adjusting bolt 50 to rotate relative to the first clamping block 30; an operating handle 51 is provided on the other end of the adjusting bolt 50, so that the operator can rotate the adjusting bolt 50 by operating the operating handle 51, so that the rotating adjusting bolt 50 drives the first clamping block 30 to slide and adjust on the base 10 through the threaded connection with the internal thread structure 11, so that the position adjustment operation of the first clamping block 30 is convenient, stable, accurate and reliable. Specifically, in Figure 3 and Figure 4As an example, a slide groove 12 extending along the spaced arrangement direction is provided on the base 10, and an embedded protrusion 33 is provided at the bottom of the first clamping block 30, which is fitted in the slide groove 12 and can slide along the slide groove 12. The purpose of sliding the first clamping block 30 on the base 10 is achieved by means of the cooperation between the embedded protrusion 33 and the slide groove 12, so that the space occupied by the first clamping block 30 in the upper and lower directions of the base 10 can be reduced. In addition, the base 10 is provided with five fixing grooves 13 which are separated from each other in the spacing arrangement direction, the bottom of the support body 20 is provided with a positioning protrusion 21 for being embedded and matched with the fixing groove 13, and the bottom of the second clamping block 40 is provided with a positioning protrusion 42 for being embedded and matched with the fixing groove 13, so that the assembly and disassembly operation between the support body 20 and the base 10 is facilitated by the cooperation of the positioning protrusion 21 and the fixing groove 13, so that the operator can flexibly adjust the position of the support body 20 on the base 10, so that different support bodies 20 can be replaced to better meet the supporting effect of batteries 200 of different sizes; similarly, the assembly and disassembly operation between the second clamping block 40 and the base 10 is facilitated by the cooperation of the positioning protrusion 42 and the fixing groove 13, so that the operator can flexibly adjust the position of the second clamping block 40 on the base 10. In addition, the top of the support body 20 has an arc-shaped support groove 22, so that the support body 20 can better match the cylindrical battery support. It should be noted that although Figure 3 and Figure 4 The number of the fixing slots 13 shown in the figure is five. Obviously, the number of the fixing slots 13 may be two, three or four according to actual needs. Figure 3 and Figure 4 In addition, since the support body 20 is installed in the fixing groove 13 by means of the positioning protrusion 21, and the second clamping block 40 is installed in the fixing groove 13 by means of the positioning protrusion 41, the number of the fixing grooves 13 is at least the sum of the number of the support body 20 and the second clamping block 40; when the number of the fixing grooves 13 is greater than the sum of the number of the support body 20 and the second clamping block 40, an idle fixing groove 13 is reserved for the support body 20 to adjust its position.

[0032] like Figure 6 As shown, as an example, the first clamping station 31 includes a first pressing block 311 and a first through slot 312 that penetrates the first clamping block 30 along the spacing arrangement direction, and the first through slot 312 also penetrates the side wall 34 (for example, Figure 5 and Figure 6The first clamping block 30 is formed on the upper side wall 34 of the first clamping block 30 to form a first notch 3121, and the first pressing block 311 is assembled on the side wall 34 and closes the first notch 3121; so as to facilitate the installation and removal of the first test needle 310 at the first clamping block 30. The second clamping station 32 includes a second pressing block 321 and a second through slot 322 that penetrates the first clamping block 30 along the spacing arrangement direction, and the second through slot 322 also penetrates the side wall 35 (for example, the side wall 35) adjacent to the first clamping block 30 and the base 10 Figure 5 and Figure 6 The second test pin 320 is mounted on the right side wall 35 of the first clamping block 30 to form a second notch 3221. The second pressing block 321 is assembled on the side wall 35 and closes the second notch 3221 to facilitate the installation and removal of the second test pin 320 at the first clamping block 30. Figure 5 and Figure 6 As an example, the first pressing block 311 protrudes from the first protrusion 3111 embedded in the first through groove 312 to increase the stability and reliability of the first pressing block 311 to the first test needle 310; the second pressing block 321 protrudes from the second protrusion 3211 embedded in the second through groove 322 to increase the stability and reliability of the second pressing block 321 to the second test needle 320. In addition, the first protrusion 3111 has an arc-shaped first embracing structure 3112, and the first embracing structure 3112 is arranged opposite to the bottom wall 3212 of the first through groove 312 to further increase the stability and reliability of the first pressing block 311 to the first test needle 310; the second protrusion 3211 has an arc-shaped second embracing structure 3212, and the second embracing structure 3212 is arranged opposite to the bottom wall 3222 of the second through groove 322 to further increase the stability and reliability of the second pressing block 321 to the second test needle 320.

[0033] Among them, in order to facilitate the installation and disassembly operation, Figure 5 and Figure 6 As an example, the battery internal resistance test fixture 100 of the utility model also includes a first rubber pad 60a respectively arranged beside the opposite sides of the first slot 3121 and a second rubber pad 60b respectively arranged beside the opposite sides of the second slot 3221. The first rubber pad 60a is located between the first top pressure block 311 and the first clamping block 30, a first locking screw 70a passes through the first top pressure block 311 and the first rubber pad 60a and then is threadedly connected to the first clamping block 30, and the second rubber pad 60b is located between the second top pressure block 321 and the first clamping block 30, a second locking screw 70b passes through the second top pressure block 321 and the second rubber pad 60b and then is threadedly connected to the first clamping block 30; such a design facilitates the assembly and disassembly operations of the first test needle 310 and the second test needle 320 on the one hand, and on the other hand, it can also ensure the reliability of the first top pressure block 311 to the first test needle 310, and the reliability of the second top pressure block 321 to the second test needle 320. It should be noted that although Figure 6The first through slot 312 penetrates the side wall 34 of the first clamping block 30 opposite to the base 10, and the second through slot 322 penetrates the side wall 35 adjacent to the first clamping block 30 and the base 10. Obviously, the positions of the first through slot 312 and the second through slot 322 can be swapped according to actual needs. Figure 6 Limits shown.

[0034] like Figure 8 As shown, as an example, the third clamping station 41 includes a third pressing block 411 and a third through slot 412 that penetrates the second clamping block 40 along the spacing arrangement direction, and the third through slot 412 also penetrates the side wall 42 (for example, Figure 7 and Figure 8 The third notch 4121 is formed on the upper side wall 42 of the second clamping block 40, and the third pressing block 411 is assembled on the side wall 42 and closes the third notch 4121 to increase the reliability of the third pressing block 411 to the third test needle 330. Figure 7 and Figure 8 As an example, the battery internal resistance test fixture 100 of the utility model further includes a third rubber pad 60c arranged beside the opposite sides of the third notch 4121, the third rubber pad 60c is located between the third top pressing block 411 and the second clamping block 40, and a third locking screw 70c passes through the third top pressing block 411 and the third rubber pad 60c and is then threadedly connected to the second clamping block 40; such a design facilitates the assembly and disassembly operation of the third test needle 330 on the second clamping block 40. In addition, the third top pressing block 411 protrudes with a third protrusion 4111 embedded in the third through groove 412, so as to further increase the reliability of the third top pressing block 411 to the third test needle 330. In addition, the third protrusion 4111 has an arc-shaped third embracing structure 4112, and the bottom wall 4122 of the third through groove 412 is arranged facing the third embracing structure 4112, so as to further increase the reliability of the third top pressing block 411 to the third test needle 330. It should be noted that although Figure 8 The third through slot 412 is shown to penetrate the side wall 42 of the second clamping block 40 opposite to the base 10. Obviously, according to actual needs, the third through slot 412 can also penetrate the side wall adjacent to the second clamping block 40 and the base 10. Figure 7 and Figure 8 Limits shown.

[0035] Compared with the prior art, the position of the first clamping block 30 can be adjusted relative to the second clamping block 40, so that the battery internal resistance test fixture 100 of the utility model can match the batteries 200 of the same type with positive and negative poles on the same side and different sides. Since the first clamping block 30 is provided with a first clamping station 31 and a second clamping station 32, and the second clamping block 40 is provided with a third clamping station 41; therefore, when testing and clamping the battery 200 with the positive and negative poles not on the same side, at this time, through the cooperation of the first test needle 310 on the first clamping station 31 and the third test needle 330 on the third clamping station 41, the test and clamping needs of the battery 200 with the positive and negative poles not on the same side supported by the support body 20 can be achieved, and the state is shown in FIG. Fig. 9 As shown; when the battery 200 with the positive and negative electrodes on the same side is tested and clamped, at this time, through the cooperation of the first test needle 310 on the first clamping station 31 and the second test needle 320 on the second clamping station 32, the battery 200 with the positive and negative electrodes on the same side supported by the support body 20 can be tested and clamped. Fig.10 Since the battery 200 is supported by the support body 20 and in contact with the test needle 310 ( 320 , 330 ), the battery 200 is ensured to be tested in a stable condition.

[0036] It is worth noting that the first test pin 310, the second test pin 320 and the third test pin 330 are used to be electrically connected to an external internal resistance tester. This connection is well known in the art and will not be repeated here. Figure 3 and Figure 4 As an example, the first clamping station 31 and the third clamping station 41 are aligned with each other along the separation arrangement direction. Obviously, according to actual needs, the positional relationship between the first clamping station 31 and the third clamping station 41 can also be other, so it is not limited to this. In addition, the aforementioned arc-shaped support groove 22 is to match the cylindrical battery 200. Obviously, when the battery 200 is of other shapes, it is sufficient to ensure that the support body 20 can support the battery 200. Therefore, the battery internal resistance test fixture 100 of the utility model is not limited to be only suitable for cylindrical batteries 200.

[0037] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A battery internal resistance test fixture, characterized in that: It includes a base, a support body for placing batteries and supporting the placed batteries, and a first clamping block and a second clamping block that are relatively spaced apart and arranged on the base and used to clamp a test needle. The first clamping block can be adjusted to a position close to or away from the second clamping block. The first clamping block is provided with a first clamping station and a second clamping station that are spaced apart from each other and are each used to clamp the test needle. The second clamping block is provided with a third clamping station for clamping the test needle. The support body is located between the first clamping block and the second clamping block along the spaced apart arrangement direction of the first clamping block and the second clamping block.

2. The battery internal resistance test fixture according to claim 1, characterized in that: It also includes an adjusting bolt, the first clamping block is slidably mounted on the base, an internal thread structure is provided on the base, the first clamping block is arranged opposite to the internal thread structure on a side facing away from the support body, the adjusting bolt passes through the internal thread structure and is threadedly connected to the internal thread structure, one end of the adjusting bolt is rotatably assembled with the first clamping block, and an operating handle is provided on the other end of the adjusting bolt.

3. The battery internal resistance test fixture according to claim 2, characterized in that: The base is provided with a slide groove extending along the spaced arrangement direction, and the bottom of the first clamping block is provided with an embedded protrusion which is matchedly placed in the slide groove and can slide along the slide groove.

4. The battery internal resistance test fixture according to claim 1, characterized in that: The first clamping station includes a first pressing block and a first through groove penetrating the first clamping block along the spacing arrangement direction, the first through groove also penetrating the side wall of the first clamping block adjacent to or opposite to the base to form a first notch, the first pressing block is assembled on the side wall and closes the first notch; the second clamping station includes a second pressing block and a second through groove penetrating the first clamping block along the spacing arrangement direction, the second through groove also penetrating the side wall of the first clamping block adjacent to or opposite to the base to form a second notch, the second pressing block is assembled on the side wall and closes the second notch.

5. The battery internal resistance test fixture according to claim 4, characterized in that: A first convex block embedded in the first through groove protrudes from the first pressing block, and a second convex block embedded in the second through groove protrudes from the second pressing block.

6. The battery internal resistance test fixture according to claim 5, characterized in that: The first protrusion has an arc-shaped first embracing structure, which is arranged opposite to the bottom wall of the first through groove; the second protrusion has an arc-shaped second embracing structure, which is arranged opposite to the bottom wall of the second through groove.

7. The battery internal resistance test fixture according to claim 4, characterized in that: It also includes first rubber pads respectively arranged on opposite sides of the first slot and second rubber pads respectively arranged on opposite sides of the second slot, the first rubber pad is located between the first top pressure block and the first clamping block, a first locking screw passes through the first top pressure block and the first rubber pad and is then threadedly connected to the first clamping block, the second rubber pad is located between the second top pressure block and the first clamping block, a second locking screw passes through the second top pressure block and the second rubber pad and is then threadedly connected to the first clamping block.

8. The battery internal resistance test fixture according to claim 1, characterized in that: The third clamping station includes a third pressing block and a third through groove penetrating the second clamping block along the spaced arrangement direction. The third through groove also penetrates the side wall adjacent to or opposite to the base of the second clamping block to form a third notch. The third pressing block is assembled on the side wall and closes the third notch.

9. The battery internal resistance test fixture according to claim 8, characterized in that: It also includes third rubber pads respectively arranged on the opposite sides of the third notch, the third rubber pads are located between the third top pressure block and the second clamping block, a third locking screw passes through the third top pressure block and the third rubber pad and is then threadedly connected to the second clamping block; the third top pressure block is protruded with a third convex block embedded in the third through groove, the third convex block has an arc-shaped third embracing structure, and the bottom wall of the third through groove is arranged facing the third embracing structure.

10. The battery internal resistance test fixture according to claim 2, characterized in that: The base is provided with a plurality of fixing grooves spaced from each other along the spacing arrangement direction. The bottoms of the support body and the second clamping block are each provided with a positioning protrusion for being embedded and matched with the fixing grooves. The top of the support body has an arc-shaped supporting groove.

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