Test fixture for battery cell

Abstract

The utility model relates to a test fixture for a battery cell, which comprises a heat transfer plate, the bottom of the battery cell is used for being arranged on one side of the heat transfer plate, and the other side opposite to the side is provided with a cooling conduit for circulating cooling liquid; and the clamping assembly is used for clamping and fixing the battery cell. According to the principle of the test fixture, a cooling structure is generally arranged at the bottom of a whole pack under actual working conditions, so that the test fixture is provided with a heat transfer plate, the bottom of a battery cell is arranged on one side of the heat transfer plate during testing, a cooling guide pipe is arranged on the other side opposite to the side of the heat transfer plate, and cooling liquid flows in and out of the cooling guide pipe; the actual working condition that a cooling system cools the battery cell is simulated, the problem that the actual test condition deviates from the battery cell condition during actual operation of the whole pack is solved, the actual use condition can be restored more truly, the service life of the battery cell can be obtained more accurately through experimental data, and the test accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a test fixture for battery cells. Background Art

[0002] The service life of the battery pack is an important parameter related to the manufacturer's warranty period. The current service life is calculated through constant temperature chamber testing and simulation results. If the actual test results cannot fit the actual use conditions well, it will greatly affect the accuracy of the simulation. Therefore, the actual test environment needs to be as close to reality as possible. At present, when testing the cells in the battery pack, a constant temperature chamber is used to control the ambient temperature, and the fixture provides a pre-tightening force to fix the cells. However, when the vehicle is actually used, there will be a cooling system to cool the cells. Such test results cannot represent the temperature state of the cells during actual use. Temperature is an important factor affecting the service life of the cells. Using this test result to evaluate the service life of the cells will result in a large deviation, and there is room for improvement. Utility Model Content

[0003] In order to overcome at least one of the defects of the prior art, according to one aspect of the present invention, a test fixture for battery cells is provided, which can more accurately evaluate the service life of the battery cells than the known test fixtures in the prior art.

[0004] A test fixture for a battery cell, assuming that one side of the battery cell having a pole is a top and the other side opposite to the pole is a bottom, comprising:

[0005] The heat transfer plate, the bottom of the battery cell is used to be arranged on one side of the heat transfer plate and the other side opposite to the side is provided with a cooling conduit for circulating a coolant;

[0006] The clamping assembly is used to clamp and fix the battery cell.

[0007] In one embodiment of the present invention, the clamping assembly includes a pair of clamping plates, which are arranged opposite to each other and a clamping space for accommodating the battery cell is formed therebetween, and the distance between the pair of clamping plates is adjustable.

[0008] In an embodiment of the present invention, the clamping assembly further comprises a locking member, threaded holes are provided at relative positions of the pair of clamping plates, and the locking member is threadedly connected in the pair of threaded holes to adjust the spacing between the pair of clamping plates.

[0009] In one embodiment of the utility model, the clamping assembly also includes a baffle, which is fixed to one side of the heat transfer plate and the side is used to assemble the battery cell. One of the pair of clamps is fixed to one end of the baffle along the length direction, and the other can move along the length direction of the baffle.

[0010] In one embodiment of the present invention, a pair of baffles are provided, the pair of baffles are arranged to face each other and the spacing direction between the baffles is perpendicular to the spacing direction of the pair of clamping plates.

[0011] In one embodiment of the utility model, the baffle plate includes a pair of legs arranged on the heat transfer plate and a baffle bar arranged between the pair of legs, and another movable clamping plate has a receiving notch and the baffle bar is placed in the receiving notch.

[0012] In one embodiment of the utility model, another movable clamping plate is provided with accommodating notches at both ends along its length direction, and a pair of baffles are provided, each of which includes a pair of supporting feet arranged on the heat transfer plate and a baffle bar arranged between the pair of supporting feet, and the pair of baffle bars are placed in the pair of accommodating notches one by one.

[0013] In an embodiment of the present invention, the cooling conduit includes a liquid inlet pipe, a liquid outlet pipe, and at least one section of a curved connecting conduit connecting the liquid inlet pipe and the liquid outlet pipe.

[0014] In an embodiment of the present invention, the communication conduit may be provided with multiple sections, and the multiple sections of the communication conduit are connected end to end.

[0015] In an embodiment of the present invention, the pipe openings of the liquid inlet pipe and the liquid outlet pipe are oriented toward the same side.

[0016] In summary, the utility model provides a test fixture for a battery cell, which has the following technical effects:

[0017] According to the principle of this test fixture, since under actual working conditions, a cooling structure is usually set at the bottom of the whole package, this test fixture is provided with a heat transfer plate. When testing, the bottom of the battery cell will be set on one side of the heat transfer plate. Therefore, a cooling duct is provided on the other side opposite to the side of the heat transfer plate, and coolant flows in and out of the cooling duct to simulate the actual working condition of cooling the battery cell with a cooling system, which solves the problem that the actual test conditions deviate from the battery cell condition when the whole package is actually running, and can more realistically restore the actual use conditions, so as to more accurately obtain the service life of the battery cell through experimental data, thereby improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a test fixture according to an embodiment of the utility model;

[0019] Figure 2 A top view of a test fixture according to an embodiment of the present utility model;

[0020] Figure 3 Another schematic diagram of the structure of the test fixture of the embodiment of the utility model;

[0021] Figure 4 It is another structural schematic diagram of the test fixture of the embodiment of the utility model;

[0022] Figure 5 A flowchart of an example of using the test fixture of an embodiment of the utility model;

[0023] Figures: 1-heat transfer plate, 2-cooling duct, 21-liquid inlet pipe, 22-liquid outlet pipe, 23-connecting duct, 31-clamping plate, 311-threaded hole, 312-accommodating notch, 32-locking piece, 33-baffle, 331-support foot, 332-baffle bar, 4-battery cell. DETAILED DESCRIPTION

[0024] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The embodiment of the utility model discloses a test fixture for a battery cell, such as Figure 1-Figure 5 As shown, the service life of the battery cell 4 can be evaluated more accurately than the known test fixture in the prior art.

[0028] In order to better describe how to test and clamp the battery cell 4, it is assumed that the side of the battery cell 4 with the pole is the top and the other side opposite to the pole is the bottom. The test fixture includes a heat transfer plate 1 and a clamping assembly for clamping and fixing the battery cell 4. The bottom of the battery cell 4 is used to be arranged on one side of the heat transfer plate 1 and the other side opposite to the side is provided with a cooling duct 2 for circulating coolant.

[0029] According to the principle of the test fixture, under actual working conditions, a cooling structure is usually set at the bottom of the whole package. Therefore, the test fixture is provided with a heat transfer plate 1. When testing, the bottom of the battery cell 4 will be set on one side of the heat transfer plate 1. Therefore, a cooling duct 2 is provided on the other side opposite to the side of the heat transfer plate 1. Cooling liquid flows in and out of the cooling duct 2 to simulate the actual working condition of cooling the battery cell 4 by a cooling system. This solves the problem that the actual test conditions deviate from the condition of the battery cell 4 when the whole package is actually running, and can more realistically restore the actual use conditions, so as to more accurately obtain the service life of the battery cell 4 through experimental data, thereby improving the accuracy of the test.

[0030] Optionally, the test fixture can be used to clamp and fix the battery cell 4 for testing. The battery cell 4 of the test fixture can preferably be a square battery cell. Of course, it can also be a cylindrical battery cell, which is not limited here.

[0031] Optionally, the test fixture can also be used to clamp and fix a battery module, and the battery module mentioned can be assembled from the above-mentioned multiple battery cells 4. The clamping and fixing object of the test object in the figure is preferably a square battery module.

[0032] Optionally, the test fixture can also be used to clamp and fix a battery pack, which can be a battery pack made of battery cells 4 through CTP technology, that is, the battery cells 4 are directly arranged in the battery pack; or the battery cells 4 can be first made into a battery module through CTM technology, and then several such modules are connected in series and parallel to form a battery pack, which is not limited here.

[0033] In order to make the specific use principle of this test fixture clearer, an example is used to illustrate: when the test fixture is running the operating condition test, the working time, current and other parameters of the battery cell 4 and the temperature of the constant temperature box can be set through an external test instrument, and the temperature, flow rate and flow rate of the coolant can be set by preset values. The whole is placed in a constant temperature box for operating condition testing, and the temperature distribution, capacity retention rate, voltage and current of the battery cell 4 are monitored. The actual service life of the battery cell 4 is evaluated through the actual detected temperature distribution and the capacity attenuation of the battery cell 4.

[0034] The above-mentioned monitoring of the temperature of the battery cell 4 may be performed at multiple temperature monitoring points on the battery cell 4 . For example, multiple temperature sensors may be provided to implement the monitoring of the temperature of the battery cell 4 at multiple points.

[0035] Optionally, the clamping assembly includes a pair of clamping plates 31. The pair of clamping plates 31 are arranged opposite to each other and a clamping space for accommodating the battery cell 4 is formed therebetween, and the spacing between the pair of clamping plates 31 is adjustable. In this way, the pair of clamping plates 31 in the test fixture can be adjusted according to the actual test pair, that is, the specific size of the battery cell 4, battery module or battery pack, and can be adapted to clamp and fix test objects of more sizes.

[0036] Optionally, the clamping assembly further includes a locking member 32, and the relative positions of the pair of clamping plates 31 are both provided with threaded holes 311, and the locking member 32 is threadedly connected in the pair of threaded holes 311 to adjust the spacing between the pair of clamping plates 31. In this way, the applied preload force can be specifically adjusted by the locking member 32, the structure is simple, and the manufacturing is convenient, which reduces the difficulty of production.

[0037] In a preferred embodiment, the locking member 32 may be a fixing bolt or other workpiece with threads on the outer surface, so as to adjust the distance between the pair of clamping plates 31 .

[0038] Optionally, the clamping assembly further includes a baffle 33, which is fixed to one side of the heat transfer plate 1 and is used to assemble the battery cell 4. One of the pair of clamps 31 is fixed to one end of the baffle 33 along the length direction, and the other can move along the length direction of the baffle 33. In this way, when the test object battery cell 4 is assembled on the test fixture, the size of the clamping space suitable for assembling the battery cell 4 can be adjusted by moving the movable clamp 31 of the pair of clamps 31, so as to achieve a stable clamping and fixing structure and improve the stability of the test.

[0039] Optionally, a pair of baffles 33 are provided, and the pair of baffles 33 are arranged opposite to each other and the spacing direction of the two is perpendicular to the spacing direction of the pair of clamps 31. In this way, the pair of baffles 33 can also play a limiting role on the battery cell 4 to prevent the battery cell 4 from moving randomly in the pair of clamps 31, and better fix the position of the battery cell 4. In order to better understand the limiting role, the spacing direction of the pair of baffles 33 is set as the first direction, which is the X direction in the figure, and the spacing direction of the pair of clamps 31 is set as the second direction, which is the Y direction in the figure. The limiting role of the pair of baffles 33 is specifically to limit the random movement of the battery cell 4 along the X direction, and the pair of clamps 31 can also play a limiting role, specifically to limit the random movement of the battery cell 4 along the Y direction.

[0040] Optionally, for the above-mentioned baffle 33, the baffle 33 includes a pair of legs 331 arranged on the heat transfer plate 1 and a baffle 332 arranged between the pair of legs 331, and the other movable clamping plate 31 has a receiving notch 312 and the baffle 332 is placed in the receiving notch 312. Therefore, by setting the receiving notch 312 on the movable clamping plate 31 and placing the baffle 332 in the receiving notch 312, the other clamping plate 31 can move along the length direction of the baffle 332, which can play a guiding role, and the baffle 332 placed in the receiving notch 312 can also play a limiting role, which can limit the clamping plate 31 from moving up and down in the height direction. In order to better understand the limiting role, the height direction of the clamping plate 31 is assumed to be the third direction, which is the Z direction in the figure, so the receiving notch 312 specifically limits the clamping plate 31 from moving freely along the Z direction.

[0041] Optionally, in the above scheme with the pair of baffles 33 and the pair of clamps 31, the other movable clamp 31 is provided with accommodating notches 312 at both ends along its length direction, and each baffle 33 includes a pair of legs 331 provided on the heat transfer plate 1 and a baffle 332 provided between the pair of legs 331. It can be seen that a pair of accommodating notches 312 and baffle 332 are provided, and the pair of baffles 332 are placed in the pair of accommodating notches 312 in a one-to-one correspondence. In this way, a more stable limiting structure can be formed, thereby improving the limiting effect on the battery cell 4.

[0042] Optionally, the cooling conduit 2 includes a liquid inlet pipe 21, a liquid outlet pipe 22, and at least one section of a curved connecting conduit 23 connected between the liquid inlet pipe 21 and the liquid outlet pipe 22. In this way, the cooling conduit 2 can expand the cooling area through the liquid inlet pipe 21, the liquid outlet pipe 22, and the curved connecting conduit 23, which is more suitable for actual cooling conditions.

[0043] Optionally, the connecting conduit 23 may be provided with multiple sections and the multiple sections of the connecting conduit 23 are connected end to end, which can further cover the cooling area of ​​multiple battery cells 4 and better fit the actual cooling conditions.

[0044] Optionally, the openings of the liquid inlet pipe 21 and the liquid outlet pipe 22 are oriented toward the same side, which can facilitate the user to assemble external pipelines and improve work efficiency.

[0045] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A test fixture for a battery cell, wherein the battery cell (4) has a side with a pole as the top and another side opposite to the pole as the bottom, characterized in that: include: A heat transfer plate (1), the bottom of the battery core (4) is arranged on one side of the heat transfer plate (1) and a cooling conduit (2) for circulating a cooling liquid is arranged on the other side opposite to the side; A clamping assembly is used to clamp and fix the battery core (4).

2. A test fixture for a battery cell according to claim 1, characterized in that: The clamping assembly comprises a pair of clamping plates (31), the pair of clamping plates (31) are arranged facing each other and a clamping space for accommodating the battery core (4) is formed therebetween, and the distance between the pair of clamping plates (31) is adjustable.

3. A test fixture for a battery cell according to claim 2, characterized in that: The clamping assembly further comprises a locking member (32), threaded holes (311) are provided at relative positions of the pair of clamping plates (31), and the locking member (32) is threadedly connected in the pair of threaded holes (311) to adjust the spacing between the pair of clamping plates (31).

4. A test fixture for a battery cell according to claim 2, characterized in that: The clamping assembly further comprises a baffle (33), wherein the baffle (33) is fixed to one side of the heat transfer plate (1) and the side is used to assemble the battery core (4), and one of the pair of clamps (31) is fixed to one end of the baffle (33) along the length direction, and the other can move along the length direction of the baffle (33).

5. A test fixture for a battery cell according to claim 4, characterized in that: A pair of baffles (33) are provided, and the pair of baffles (33) are arranged facing each other and the spacing direction between the two is perpendicular to the spacing direction of the pair of clamping plates (31).

6. A test fixture for a battery cell according to claim 4, characterized in that: The baffle (33) comprises a pair of legs (331) arranged on the heat transfer plate (1) and a baffle (332) arranged between the pair of legs (331); another movable clamping plate (31) has an accommodating notch (312) and the baffle (332) is placed in the accommodating notch (312).

7. A test fixture for a battery cell according to claim 4, characterized in that: Another movable clamping plate (31) is provided with accommodating notches (312) at both ends along its length direction. A pair of baffles (33) are provided, and each baffle (33) comprises a pair of legs (331) arranged on the heat transfer plate (1) and a baffle bar (332) arranged between the pair of legs (331). The pair of baffle bars (332) are arranged in a one-to-one correspondence in the pair of accommodating notches (312).

8. A test fixture for a battery cell according to claim 1, characterized in that: The cooling conduit (2) comprises a liquid inlet pipe (21), a liquid outlet pipe (22), and at least one section of a curved connecting conduit (23) connecting the liquid inlet pipe (21) and the liquid outlet pipe (22).

9. A test fixture for a battery cell according to claim 8, characterized in that: The connecting conduit (23) may be provided with multiple sections, and the multiple sections of the connecting conduit (23) are connected end to end.

10. A test fixture for a battery cell according to claim 8, characterized in that: The pipe openings of the liquid inlet pipe (21) and the liquid outlet pipe (22) are oriented toward the same side.

Images