A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries

Abstract

The present invention discloses a high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries, comprising: a base, the top of which has a mounting surface; a battery placement mechanism, comprising a battery placement plate and a front-and-rear adjustment component, the battery placement plate is arranged on the mounting surface; the front-and-rear adjustment component is arranged on the battery placement plate; a battery side positioning mechanism, comprising a side positioning support seat and a first pushing component, the side positioning support seat is arranged on the mounting surface and is located at the rear of the battery placement plate; the first pushing component is arranged on the side positioning support seat, and the pushing end of the first pushing component is provided with a battery side positioning plate; an electrode clamping mechanism, arranged on the mounting surface, comprising a positive clamping mechanism and a negative clamping mechanism; and a test meter, arranged on the mounting surface of the base, the signal input end of the test meter is electrically connected to the test signal output end of the electrode clamping mechanism. The beneficial effects of the present invention are: high consistency in repeated tests, and effective protection of the appearance of the battery cell.

Description

Technical Field

[0001] The invention relates to a high-precision voltage and internal resistance testing device for a soft-pack power lithium-ion battery, also known as a Master IROCV testing device, and belongs to the manufacturing field of soft-pack lithium battery testing devices. Background Art

[0002] After the soft-pack power lithium-ion battery is divided into capacities, it needs to be subjected to ACIR and OCV tests to obtain the K value, AC resistance, voltage and other parameters of the soft-pack power lithium-ion battery, so as to sort out the batteries with unqualified parameters to ensure the quality of the finished battery. In traditional technology, after the automatic OCV test equipment is tested, manual spot checks are performed to manually retest and compare single cells, which will lead to the following disadvantages: First, the manual retest battery cannot be fixed, and the test points cannot be unified, which affects the stability of the test results; second, due to manual operation, it is easy to scratch the battery surface, making the battery appearance poor. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a high-precision voltage and internal resistance testing device for soft-pack power lithium-ion batteries, which can effectively solve the instability of manual retesting of single cells and more effectively protect the appearance of the cells.

[0004] The Master IROCV (high-precision voltage, internal resistance) test equipment for soft-pack power lithium-ion batteries of the present invention is characterized by comprising:

[0005] A base, wherein the top of the base has a mounting surface;

[0006] The battery placement mechanism comprises a battery placement plate and a front-rear adjustment component, wherein the battery placement plate is arranged on the mounting surface of the base and is used to place batteries; the front-rear adjustment component is arranged on the battery placement plate and is used to adjust the position of the battery on the battery placement plate;

[0007] The battery side positioning mechanism comprises a side positioning support seat and a first pushing assembly, wherein the side positioning support seat is arranged on the mounting surface of the base and is located at the rear of the battery placement plate; the first pushing assembly is arranged on the side positioning support seat, and a battery side positioning plate is arranged at the pushing end of the first pushing assembly for positioning the battery laterally;

[0008] An electrode clamping mechanism is arranged on the mounting surface of the base, and includes a positive electrode clamping mechanism and a negative electrode clamping mechanism, wherein the positive electrode clamping mechanism and the negative electrode clamping mechanism are arranged at opposite ends of the battery placement plate, and are respectively used to contact the positive and negative electrode tabs of the battery for testing;

[0009] And a test meter is arranged on the mounting surface of the base, and the signal input end of the test meter is electrically connected to the test signal output end of the electrode clamping mechanism for collecting battery test data.

[0010] Furthermore, the base includes a bottom plate, a control unit and a wire tie rod assembly, and the bottom of the bottom plate is provided with adjustable legs; the control unit is arranged on the bottom plate, and the top of the control unit is a flat top that can be used as a mounting surface, and the front of the control unit is provided with an emergency stop button, a counter and a plurality of button indicator lights, with one side of the button indicator light being set as the front, and the other side being set as the rear; the control unit is connected to the emergency stop button circuit, and is used to stop the test equipment in an emergency state; the button indicator lights are respectively connected to the battery placement mechanism, the battery side positioning mechanism and the electrode clamping mechanism circuits, and are used to display the working states of the battery placement mechanism, the battery side positioning mechanism and the electrode clamping mechanism; the signal input end of the counter is respectively electrically connected to the position signal output end of the battery side positioning mechanism and the position signal output end of the electrode clamping mechanism, and is used to display the position state value of the electrode clamping mechanism; the wire tie rod assembly is arranged on the top of the control unit, and is used to fix the wires and the air pipe.

[0011] Furthermore, the front and rear adjustment assembly includes a front and rear adjustment plate, a front and rear adjustment guide rod, a battery fixing plate and a hinge, the front and rear adjustment guide rod is arranged at the first end of the battery placement plate through a fixing block assembly; the front and rear adjustment plate is slidably arranged on the front and rear adjustment guide rod; the battery fixing plate is arranged at the bottom of the front and rear adjustment plate for fixing the battery; the hinge is arranged at one end of the front and rear adjustment guide rod for quickly unlocking the battery.

[0012] Further, the first pushing assembly includes a first guide rail assembly, a first screw rod assembly, a first sliding member and a battery side positioning plate, the first guide rail assembly is arranged on the mounting surface of the base and is located behind the battery placement mechanism, and is used to guide the battery side positioning plate to reciprocate along the front and rear directions of the test equipment; the first screw rod assembly is rotatably mounted on the mounting surface of the base and is located behind the battery placement mechanism, and the first screw rod assembly and the first guide rail assembly are both axially arranged along the front and rear adjustment guide rod; a first hand wheel is provided at the rear end of the first screw rod assembly, and a first encoder for detecting the position of the first screw rod assembly is provided at the front end; the first sliding member is provided on the first screw rod assembly and is screwed to the first screw rod assembly; the battery side positioning plate is slidably arranged on the first guide rail assembly and is fixedly connected to the first sliding member; the signal output end of the first encoder is electrically connected to the corresponding signal input end of the counter.

[0013] Furthermore, the positive electrode clamping mechanism includes a second guide rail assembly, a second screw rod assembly, a first lifting mechanism, a first cylinder and a positive electrode tab clamp, the second guide rail assembly is arranged on the mounting surface of the base and is located at the first end of the battery placement mechanism; the second screw rod assembly is rotatably mounted on the mounting surface of the base, and the second screw rod assembly is externally screwed to a second sliding member; a second hand wheel is provided at one end of the second screw rod assembly, and a second encoder for detecting the position of the second screw rod assembly is provided at the other end, and a signal output end of the second encoder is electrically connected to a corresponding signal input end of the counter; the first lifting mechanism is arranged on the second sliding member, and is used to adjust the height to adapt to the thickness of the battery; the first cylinder is installed on the lifting part of the first lifting mechanism, and the positive electrode tab clamp is installed at the movable end of the first cylinder; the air vent of the first cylinder is connected to the external air source pipeline through a pipeline interface; the test signal output end of the positive electrode tab clamp is electrically connected to the signal input end of the test instrument.

[0014] Furthermore, the first lifting mechanism includes a sliding base plate and a scissor-type lifting mechanism, the sliding base plate is slidably arranged on the second guide rail assembly, and the sliding base plate is fixedly connected to the second sliding member; the scissor-type lifting mechanism is arranged on the sliding base plate, and the first cylinder is installed on the top.

[0015] Furthermore, the negative electrode clamping mechanism includes a third guide rail assembly, a third screw rod assembly, a second lifting mechanism, a second cylinder and a negative electrode tab clamp, wherein the third guide rail assembly is arranged on the mounting surface of the base and is located at the second end of the battery placement mechanism; the third screw rod assembly is rotatably mounted on the mounting surface of the base, and the third screw rod assembly is externally screwed to a third sliding member; a third hand wheel is arranged at one end of the third screw rod assembly, and a third encoder for detecting the position of the third screw rod assembly is arranged at the other end, and a signal output end of the third encoder is electrically connected to a corresponding signal input end of the counter; the second lifting mechanism is arranged on the third sliding member, and is used to adjust the height to adapt to the thickness of the battery; the second cylinder is installed on the lifting part of the second lifting mechanism, and the negative electrode tab clamp is installed at the movable end of the second cylinder, and the air vent of the second cylinder is connected to the external air source pipeline through a pipeline interface; the test signal output end of the negative electrode tab clamp is electrically connected to the signal input end of the test instrument.

[0016] Furthermore, the second lifting mechanism includes a sliding frame and a lifting screw rod assembly, the sliding frame can be slidably mounted on the third guide rail assembly, the sliding frame is fixedly connected to the third sliding member, and the sliding frame is provided with a channel for the battery fixing plate to pass through; the lifting screw rod assembly includes a supporting frame, a vertical screw rod assembly and a vertical sliding member, the supporting frame is arranged on the sliding frame; the vertical screw rod assembly can be rotatably mounted on the supporting frame, and the top of the vertical screw rod assembly is equipped with a fourth hand wheel; the vertical sliding member is screwed to the vertical screw rod assembly, and the second cylinder is installed on the vertical sliding member.

[0017] The beneficial effects of the present invention are reflected in: high consistency in repeated tests and the ability to effectively protect the appearance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an axonometric view of the present invention;

[0019] Figure 2 It is a front view of the present invention;

[0020] Figure 3 is a top view of the present invention;

[0021] Figure 4 It is a left side view of the present invention;

[0022] Figure 5 is an axonometric view of the base of the present invention;

[0023] Figure 6 is a front view of the base of the present invention;

[0024] Figure 7 is a top view of the base of the present invention;

[0025] Figure 8 It is a left side view of the base of the present invention;

[0026] Fig. 9 is an axonometric view of the battery placement mechanism of the present invention;

[0027] Fig.10 is a front view of the battery placement mechanism of the present invention;

[0028] Fig.11 is a top view of the battery placement mechanism of the present invention;

[0029] Fig.12 Left side view of the battery placement mechanism;

[0030] Fig.13 is an axonometric view of the battery side positioning mechanism of the present invention;

[0031] Fig.14is a front view of the battery side positioning mechanism of the present invention;

[0032] Fig.15 is a top view of the battery side positioning mechanism of the present invention;

[0033] Fig.16 It is a left side view of the battery side positioning mechanism of the present invention;

[0034] Fig.17 is an axonometric view of the positive electrode clamping mechanism of the present invention;

[0035] Fig.18 is a front view of the positive electrode clamping mechanism of the present invention;

[0036] Fig.19 is a top view of the positive electrode clamping mechanism of the present invention;

[0037] Fig. 20 It is a left side view of the negative electrode clamping mechanism of the present invention;

[0038] Fig.21 is an axonometric view of the negative electrode clamping mechanism of the present invention;

[0039] Fig. 22 is a front view of the negative electrode clamping mechanism of the present invention;

[0040] Fig.23 is a top view of the negative electrode clamping mechanism of the present invention;

[0041] Fig.24 It is a left side view of the negative electrode clamping mechanism of the present invention. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with the accompanying drawings.

[0043] Refer to the attached figure:

[0044] Embodiment 1 A high-precision voltage and internal resistance testing device for a soft-pack power lithium-ion battery according to the present invention comprises:

[0045] The base 100 has a mounting surface 140 on the top of the base;

[0046] The battery placement mechanism 200 includes a battery placement plate 210 and a front-rear adjustment assembly 220. The battery placement plate 210 is disposed on the mounting surface of the base 100 and is used to place the battery 600. The front-rear adjustment assembly 220 is disposed on the battery placement plate 210 and is used to adjust the position of the battery on the battery placement plate.

[0047] The battery side positioning mechanism 300 includes a side positioning support seat 310 and a first pushing component 320. The side positioning support seat 310 is arranged on the mounting surface of the base 100 and is located behind the battery placement plate 210. The first pushing component 320 is arranged on the side positioning support seat 310, and a battery side positioning plate is arranged at the pushing end of the first pushing component 320 for positioning the battery laterally.

[0048] The electrode clamping mechanism 400 is disposed on the mounting surface of the base 100, and includes a positive electrode clamping mechanism 410 and a negative electrode clamping mechanism 420. The positive electrode clamping mechanism 410 and the negative electrode clamping mechanism 420 are arranged at opposite ends of the battery placement plate 210, and are respectively used to contact the positive and negative electrode tabs of the battery for testing;

[0049] And a test meter 500 is arranged on the mounting surface of the base 100, and the signal input end of the test meter 500 is electrically connected to the test signal output end of the electrode clamping mechanism 400 for collecting battery test data.

[0050] The base 100 includes a bottom plate 110, a control unit 120 and a wire tie rod assembly 130. The bottom plate 110 is the entire soft-pack power lithium-ion battery Master The reference basic component of the IROCV test equipment has an adjustable support leg 111 at the bottom for adjusting the height and level of the base plate 110; the control unit 120 is arranged on the base plate 110, and the top of the control unit 120 is a flat top that can be used as a mounting surface, and the front of the control unit 120 is provided with an emergency stop button 121, multiple counters 122 and multiple button indicator lights 123, with the side where the button indicator lights are set as the front, and the other side as the back; the control unit is connected to the emergency stop button circuit for stopping the test equipment in an emergency state; the button indicator lights are respectively connected to the battery placement mechanism 200, the battery side positioning mechanism 300 and the electrode clamping mechanism 400 circuits for displaying the working status of the battery placement mechanism, the battery side positioning mechanism and the electrode clamping mechanism; the signal input end of the counter 122 is respectively electrically connected to the position signal output end of the battery side positioning mechanism and the position signal output end of the electrode clamping mechanism for displaying the position state value of the electrode clamping mechanism; the wire tie rod assembly is arranged on the top of the control unit for fixing wires and air pipes.

[0051] The battery placement plate 210 is a rectangular plate, and the front-rear adjustment assembly 220 includes a front-rear adjustment plate 221, a front-rear adjustment guide rod 222, a battery fixing plate 223 and a hinge 224. The front-rear adjustment guide rod 221 is arranged at the first end of the battery placement plate 210 through a fixing block assembly and is arranged along the width direction of the battery placement plate 210; the front-rear adjustment plate 221 is slidably arranged on the front-rear adjustment guide rod 222; the battery fixing plate 223 is arranged at the bottom of the front-rear adjustment plate 221 for fixing the battery; the hinge 224 is arranged at one end of the front-rear adjustment guide rod for quickly unlocking the battery.

[0052] The first pushing assembly 320 includes a first guide rail assembly 321, a first screw assembly 322, a first sliding member 323 and a battery side positioning plate 324. The first guide rail assembly 321 is arranged on the mounting surface of the base 100 and is located behind the battery placement mechanism 200, and is used to guide the battery side positioning plate to reciprocate along the front and rear directions of the test equipment; the first screw assembly 322 is rotatably mounted on the mounting surface of the base 100 and is located behind the battery placement mechanism 322. The first screw assembly 322 and the first guide rail assembly 321 are both arranged along the front and rear adjustment guide The rod is arranged axially, that is, arranged along the width direction of the battery placement plate 210; the rear end of the first screw rod assembly 322 is provided with a first hand wheel 325, and the front end is provided with a first encoder 326 for detecting the position of the first screw rod assembly; the first sliding member 323 is provided on the first screw rod assembly 322 and is screwed to the first screw rod assembly 322; the battery side positioning plate 324 is slidably provided on the first guide rail assembly 321 and is fixedly connected to the first sliding member 323; the signal output end of the first encoder 326 is electrically connected to the corresponding signal input end of the counter.

[0053] The positive electrode clamping mechanism 410 includes a second guide rail assembly 411, a second screw assembly 412, a first lifting mechanism 413, a first cylinder 414 and a positive electrode tab clamp 415, wherein the second guide rail assembly 411 is arranged on the mounting surface of the base 100 and is located at the first end of the battery placement mechanism 200 along the length direction; the second screw assembly 412 is rotatably mounted on the mounting surface of the base 100, and the second screw assembly 412 is externally screwed to a second sliding member 416; a second hand wheel 417 is arranged at one end of the second screw assembly 412, and a second hand wheel 417 is arranged at the other end for detecting the second screw assembly The second encoder 418 of the position, the signal output end of the second encoder 418 is electrically connected to the corresponding signal input end of the counter; the first lifting mechanism 413 is arranged on the second sliding member 416, and is used to adjust the height to adapt to the battery thickness; the first cylinder 414 is installed on the lifting part of the first lifting mechanism 413, and the positive electrode tab clamp 415 is installed at the movable end of the first cylinder 414; the vent of the first cylinder 414 is connected to the external air source pipeline through the pipeline interface; the test signal output end of the positive electrode tab clamp 415 is electrically connected to the signal input end of the test instrument 500.

[0054] The first lifting mechanism 413 includes a sliding base plate 4131 and a scissor-type lifting mechanism 4132. The sliding base plate 4131 can be slidably arranged on the second guide rail assembly, and the sliding base plate is fixedly connected to the second sliding member; the scissor-type lifting mechanism 4132 is arranged on the sliding base plate, and the first cylinder is installed on the top.

[0055] The negative electrode clamping mechanism 420 includes a third guide rail assembly 421, a third screw assembly 422, a second lifting mechanism 423, a second cylinder 424 and a negative electrode tab clamp 425. The third guide rail assembly 421 is arranged on the mounting surface of the base 100 and is located at the second end of the battery placement mechanism 200 along the length direction; the third screw assembly 422 is rotatably mounted on the mounting surface of the base 100, and the third screw assembly 422 is externally screwed to a third sliding member 426; one end of the third screw assembly 422 is provided with a third hand wheel 427, and the other end is provided with a third screw for detecting the third screw. A third encoder 428 for the position of the rod assembly, the signal output end of the third encoder 428 is electrically connected to the corresponding signal input end of the counter; the second lifting mechanism 423 is arranged on the third sliding member 426, and is used to adjust the height to adapt to the thickness of the battery; the second cylinder 424 is installed on the lifting part of the second lifting mechanism 423, and the negative pole tab clamp 425 is installed at the movable end of the second cylinder, and the air vent of the second cylinder is connected to the external air source pipeline through the pipeline interface; the test signal output end of the negative pole tab clamp 425 is electrically connected to the signal input end of the test instrument 500.

[0056] The second lifting mechanism 423 includes a sliding frame 4231 and a lifting screw assembly 4232, the sliding frame 4231 is slidably mounted on the third guide rail assembly 421, the sliding frame 4231 is fixedly connected to the third sliding member 426, and the sliding frame 4231 is provided with a channel for the battery fixing plate to pass through; the lifting screw assembly 4232 includes a supporting frame 42321, a vertical screw assembly 42322 and a vertical sliding member 42323, the supporting frame is arranged on the sliding frame; the vertical screw assembly is rotatably mounted on the supporting frame, and the top of the vertical screw assembly is equipped with a fourth hand wheel 42324; the vertical sliding member is screwed to the vertical screw assembly, and the second cylinder is installed on the vertical sliding member.

[0057] The contact edges of the positive electrode tab clamp and the negative electrode tab clamp are both folded downward to form pressing edges that can contact the positive and negative electrode tabs of the battery.

[0058] The contents described in the embodiments of this specification are merely an enumeration of implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the inventive concept.

Claims

1. A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries, characterized in that: include: A base, wherein the top of the base has a mounting surface; The battery placement mechanism comprises a battery placement plate and a front-rear adjustment component, wherein the battery placement plate is arranged on the mounting surface of the base and is used to place batteries; the front-rear adjustment component is arranged on the battery placement plate and is used to adjust the position of the battery on the battery placement plate; The battery side positioning mechanism comprises a side positioning support seat and a first pushing assembly, wherein the side positioning support seat is arranged on the mounting surface of the base and is located at the rear of the battery placement plate; the first pushing assembly is arranged on the side positioning support seat, and a battery side positioning plate is arranged at the pushing end of the first pushing assembly for positioning the battery laterally; An electrode clamping mechanism is arranged on the mounting surface of the base, and includes a positive electrode clamping mechanism and a negative electrode clamping mechanism, wherein the positive electrode clamping mechanism and the negative electrode clamping mechanism are arranged at opposite ends of the battery placement plate, and are respectively used to contact the positive and negative electrode tabs of the battery for testing; and a test meter, which is arranged on the mounting surface of the base, wherein a signal input end of the test meter is electrically connected to a test signal output end of the electrode clamping mechanism, and is used for collecting battery test data; The base includes a bottom plate, a control unit and a wire tie rod assembly, and the bottom of the bottom plate is provided with adjustable legs; the control unit is arranged on the bottom plate, and the top of the control unit is a flat top that can be used as a mounting surface, and the front of the control unit is provided with an emergency stop button, a counter and a plurality of button indicator lights, with one side of the button indicator light being the front and the other side being the rear; the control unit is connected to the emergency stop button circuit and is used to stop the test equipment in an emergency state; the button indicator lights are respectively connected to the battery placement mechanism, the battery side positioning mechanism and the electrode clamping mechanism circuits, and are used to display the working states of the battery placement mechanism, the battery side positioning mechanism and the electrode clamping mechanism; the signal input end of the counter is respectively electrically connected to the position signal output end of the battery side positioning mechanism and the position signal output end of the electrode clamping mechanism, and is used to display the position state value of the electrode clamping mechanism; the wire tie rod assembly is arranged on the top of the control unit and is used to fix the wires and the air pipe; The positive electrode clamping mechanism includes a second guide rail assembly, a second screw assembly, a first lifting mechanism, a first cylinder and a positive electrode tab clamp, wherein the second guide rail assembly is arranged on the mounting surface of the base and is located at the first end of the battery placement mechanism; the second screw assembly is rotatably mounted on the mounting surface of the base, and the second screw assembly is externally screwed to a second sliding member; a second hand wheel is arranged at one end of the second screw assembly, and a second encoder for detecting the position of the second screw assembly is arranged at the other end, and a signal output end of the second encoder is electrically connected to a corresponding signal input end of the counter; the first lifting mechanism is arranged on the second sliding member, and is used to adjust the height to adapt to the thickness of the battery; the first cylinder is installed on the lifting part of the first lifting mechanism, and the positive electrode tab clamp is installed at the movable end of the first cylinder; the air vent of the first cylinder is connected to an external air source pipeline through a pipeline interface; the test signal output end of the positive electrode tab clamp is electrically connected to the signal input end of the test instrument; The negative electrode clamping mechanism includes a third guide rail assembly, a third screw assembly, a second lifting mechanism, a second cylinder and a negative electrode tab clamp, wherein the third guide rail assembly is arranged on the mounting surface of the base and is located at the second end of the battery placement mechanism; the third screw assembly is rotatably mounted on the mounting surface of the base, and the third screw assembly is externally screwed to a third sliding member; a third hand wheel is arranged at one end of the third screw assembly, and a third encoder for detecting the position of the third screw assembly is arranged at the other end, and a signal output end of the third encoder is electrically connected to a corresponding signal input end of the counter; the second lifting mechanism is arranged on the third sliding member, and is used to adjust the height to adapt to the thickness of the battery; the second cylinder is installed on the lifting part of the second lifting mechanism, and the negative electrode tab clamp is installed at the movable end of the second cylinder, and the air vent of the second cylinder is connected to an external air source pipeline through a pipeline interface; the test signal output end of the negative electrode tab clamp is electrically connected to the signal input end of the test instrument.

2. A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries as claimed in claim 1, characterized in that: The front-to-back adjustment assembly includes a front-to-back adjustment plate, a front-to-back adjustment guide rod, a battery fixing plate and a hinge. The front-to-back adjustment guide rod is arranged at the first end of the battery placement plate through a fixing block assembly; the front-to-back adjustment plate is slidably arranged on the front-to-back adjustment guide rod; the battery fixing plate is arranged at the bottom of the front-to-back adjustment plate for fixing the battery; the hinge is arranged at one end of the front-to-back adjustment guide rod for quickly unlocking the battery.

3. A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries as claimed in claim 2, characterized in that: The first pushing assembly includes a first guide rail assembly, a first screw rod assembly, a first sliding member and a battery side positioning plate. The first guide rail assembly is arranged on the mounting surface of the base and is located behind the battery placement mechanism, and is used to guide the battery side positioning plate to reciprocate along the front and rear directions of the test equipment; the first screw rod assembly is rotatably mounted on the mounting surface of the base and is located behind the battery placement mechanism, and the first screw rod assembly and the first guide rail assembly are both axially arranged along the front and rear adjustment guide rod; a first hand wheel is provided at the rear end of the first screw rod assembly, and a first encoder for detecting the position of the first screw rod assembly is provided at the front end; the first sliding member is provided on the first screw rod assembly and is screwed to the first screw rod assembly; the battery side positioning plate is slidably arranged on the first guide rail assembly and is fixedly connected to the first sliding member; the signal output end of the first encoder is electrically connected to the corresponding signal input end of the counter.

4. A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries as claimed in claim 1, characterized in that: The first lifting mechanism includes a sliding bottom plate and a scissor-type lifting mechanism. The sliding bottom plate is slidably arranged on the second guide rail assembly, and the sliding bottom plate is fixedly connected to the second sliding member. The scissor-type lifting mechanism is arranged on the sliding bottom plate, and the first cylinder is installed on the top.

5. A high-precision voltage and internal resistance test device for soft-pack power lithium-ion batteries as claimed in claim 1, characterized in that: The second lifting mechanism includes a sliding frame and a lifting screw rod assembly, the sliding frame can be slidably mounted on the third guide rail assembly, the sliding frame is fixedly connected to the third sliding member, and the sliding frame is provided with a channel for the battery fixing plate to pass through; the lifting screw rod assembly includes a supporting frame, a vertical screw rod assembly and a vertical sliding member, the supporting frame is arranged on the sliding frame; the vertical screw rod assembly can be rotatably mounted on the supporting frame, and the top of the vertical screw rod assembly is equipped with a fourth hand wheel; the vertical sliding member is screwed to the vertical screw rod assembly, and the second cylinder is installed on the vertical sliding member.

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