Clamping tool for square battery charging and discharging test

Abstract

The utility model provides a clamping tool used for a square battery charging and discharging test, comprising a pedestal provided with an accommodating space used for installing a square battery; the base is mounted on the base, and the base is a conductive piece and is suitable for being connected with a bar piece and a current line terminal of a square battery; the cover body is detachably mounted on the base, and when the cover body is mounted on the base, a sheet and a current line terminal of a square battery are clamped between the cover body and the base. According to the clamping tool provided by the utility model, the pedestal, the base and the cover body are combined, and the base and the cover body are matched, so that the contact area and the clamping firmness of the chip and the current line terminal can be increased, and therefore, the pressure intensity at the joint can be increased, the contact impedance can be reduced, the heat dissipation can be enhanced, the test data authenticity can be ensured, and the test safety can be improved.

Description

Technical Field

[0001] The utility model relates to the field of new energy battery testing, and more specifically, to a clamping tool for square battery charge and discharge testing. Background Art

[0002] With the rapid development of the energy storage market, battery performance and safety issues have also attracted much attention. Therefore, battery testing is particularly important in the entire process, and whether the test can provide the most realistic performance of the battery is of paramount importance.

[0003] At present, when conducting electrical performance tests on square shell batteries, the method of welding aluminum tabs and connecting and locking them with bolts and nuts to the current line terminals of the charger and discharger is basically adopted. This connection method results in a small contact area between the tabs and the current line terminals, resulting in a large contact resistance. Moreover, the tightness of the connection between the tabs and the current line terminals can only be achieved through the pressure provided by the mutual squeezing of the bolts and nuts. If the squeezing degree is not enough, the pressure generated is small, and the contact impedance between the tabs and the current line terminals is large. In addition, if the internal contact resistance is large, additional heat will be generated when current passes through. Overheating of the tabs and current line terminals will accelerate oxidation, and the contact impedance will also increase accordingly, forming a vicious cycle. The heat will be conducted to the inside of the battery through the tabs, thereby generating a temperature rise outside the battery body, causing distortion of the test data. In severe cases, it will cause damage to the battery and even risk thermal runaway. Utility Model Content

[0004] The utility model provides a new technical solution of a clamping tool for square battery charge and discharge testing, which can be used for square battery charge and discharge testing.

[0005] According to the utility model, a clamping tool for square battery charge and discharge testing is provided, including: a base, which has a receiving space, and the receiving space is used to install a square battery; a base, which is installed on the base, and the base is a conductive member and is suitable for connecting the tabs and current line terminals of the square battery; a cover body, which is detachably installed on the base, and when the cover body is installed on the base, the tabs and current line terminals of the square battery are clamped between the cover body and the base.

[0006] Optionally, when the cover is mounted on the base, the minimum thickness of the gap between the cover and the base is less than the thickness of the tab of the square battery (0.3mm-0.7mm), or less than the thickness of the current line terminal (0.3mm-0.7mm).

[0007] Optionally, a side where the base and the cover are close to each other has a tooth-shaped structure.

[0008] Optionally, the clamping fixture for square battery charge and discharge testing further includes: a locking structure, which is installed on the base and is respectively connected to the base and the cover.

[0009] Optionally, a mounting through hole is provided on the base, and the locking structure extends into the mounting through hole to fix the base on the base.

[0010] Optionally, there are multiple locking structures.

[0011] Optionally, the cover body includes: a first cover plate, which is detachably mounted on the base, and when the first cover plate is mounted on the base, a tab of a square battery is clamped between the first cover plate and the base; and a second cover plate, which is opposite to the base, and a current line terminal is clamped between the second cover plate and the base.

[0012] Optionally, the base is a nickel-plated copper piece.

[0013] Optionally, the base includes: a first bracket, the first bracket extends along a first direction; a second bracket, the second bracket extends along a second direction, and there is an angle between the second direction and the first direction. The base is mounted on the second bracket, and the base and the first bracket are spaced apart and distributed in the second direction.

[0014] Optionally, an end of the second bracket close to the first bracket has a hollow structure.

[0015] According to the embodiment of the utility model, the clamping tool for square battery charge and discharge testing adopts a combination of a base, a base and a cover. Through the cooperation of the base and the cover, the contact area and clamping firmness of the tab and the current line terminal can be increased, thereby increasing the pressure at the connection, reducing the contact impedance, enhancing heat dissipation, ensuring the authenticity of the test data and improving the test safety.

[0016] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a clamping fixture for charging and discharging tests of square batteries according to an embodiment of the present utility model;

[0019] Figure 2This is a structural schematic diagram of a base at one angle according to an embodiment of the utility model;

[0020] Figure 3 This is a structural schematic diagram of the base according to another embodiment of the present utility model from another angle;

[0021] Figure 4 This is a schematic diagram of the assembly of the clamping fixture and the current line terminal according to an embodiment of the present utility model;

[0022] Figure 5 This is a schematic diagram of the assembly of the clamping fixture, current line terminals, and square batteries according to an embodiment of the present utility model;

[0023] Figure 6 This is a schematic structural diagram of the second bracket according to an embodiment of the present utility model;

[0024] Figure 7 This is a schematic structural diagram of a first bracket according to an embodiment of the present utility model;

[0025] Figure 8 This is a schematic structural diagram of a fixing portion according to an embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the connection between the current line and the current line terminal according to an embodiment of the present utility model;

[0027] Figure 10 This is a schematic structural diagram of a base according to an embodiment of the present utility model;

[0028] Figure 11 This is a schematic structural diagram of the second cover plate of an embodiment of the utility model;

[0029] Figure 12 This is a schematic structural diagram of the first cover plate of an embodiment of the utility model;

[0030] Figure 13 This is a schematic structural diagram of a square battery with welded tabs according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] A clamping fixture 100 for charging and discharging tests of a square battery 200;

[0033] Base 10; first bracket 11; first connecting portion 111; first slot 112; second slot 113; second bracket 12; third slot 121; mounting through hole 122; hollow structure 123;

[0034] Base 20; tooth structure 21;

[0035] Cover body 30; first cover plate 31; second cover plate 32;

[0036] Locking structure 40; first locking member 41; second locking member 42; fixing portion 43;

[0037] Square battery 200; bar 201;

[0038] Current line 300; current line terminal 301. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0042] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] The clamping fixture 100 for charging and discharging testing of a square battery 200 according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] like Figures 1 to 13 As shown, the clamping fixture 100 for charging and discharging test of a square battery 200 according to an embodiment of the present invention includes: a base 10, a base 20 and a cover 30.

[0046] Specifically, the base 10 has a receiving space for installing the square battery 200. The base 20 is installed on the base 10. The base 20 is a conductive member and is suitable for connecting the tabs 201 and the current line terminals 301 of the square battery 200. The cover 30 is detachably installed on the base 20. When the cover 30 is installed on the base 20, the tabs 201 and the current line terminals 301 of the square battery 200 that are connected to each other are clamped between the cover 30 and the base 20.

[0047] In other words, the fixture 100 for charging and discharging a prismatic battery 200 according to the present invention primarily consists of a base 10, a conductive base 20, and a cover 30. The base 10 has a receiving space on which the prismatic battery 200 can be mounted. The base 10 can be made of, for example, red bakelite. The base 20 is mounted on the base 10, through which the tabs 201 of the prismatic battery 200 and the current line terminals 301 can be connected.

[0048] In addition, a removable cover 30 is mounted on the base 20. When the cover 30 is mounted on the base 20, the tabs 201 and current line terminals 301 of the prismatic battery 200 are sandwiched between the cover 30 and the base 20. In other words, a gap is formed between the cover 30 and the base 20, within which the tabs 201 and current line terminals 301 of the prismatic battery 200 are mounted. This means that at least a portion of the tabs 201 and current line terminals 301 can be clamped between the cover 30 and the base 20. Furthermore, the cover 30 is a plate-shaped member. Mounting the tabs 201 and current line terminals 301 between the cover 30 and the surface of the base 20 increases the contact area between the tabs 201 and current line terminals 301, thereby resolving the technical issue of high contact resistance. It should be noted that in this embodiment, the base 20 and the cover 30 can be connected by bolts, snaps, or other means, which are not limited herein.

[0049] Therefore, according to the embodiment of the utility model, the clamping tool 100 for the charge and discharge test of the square battery 200 adopts a combination of a base 10, a base 20 and a cover 30. Through the cooperation of the base 20 and the cover 30, the contact area and the clamping firmness of the tab 201 and the current line terminal 301 can be increased, thereby increasing the pressure at the connection, reducing the contact impedance, enhancing heat dissipation, ensuring the authenticity of the test data and improving the test safety.

[0050] In some specific embodiments of the present invention, the cover 30 includes a first cover plate 31 and a second cover plate 32. The first cover plate 31 is removably mounted to the base 20. When the first cover plate 31 is mounted on the base 20, the tab 201 of the prismatic battery 200 is sandwiched between the first cover plate 31 and the base 20. The second cover plate 32 faces the base 20, and the current line terminal 301 is sandwiched between the second cover plate 32 and the base 20. For example, the first cover plate 31 and the second cover plate 32 are spaced apart along the Z-axis. This means that the tab 201 and the current line terminal 301 can be fixed separately. For example, the second cover plate 32 faces the base 20, and the current line terminal 301 is sandwiched between the second cover plate 32 and the base 20. This means that at least a portion of the current line terminal 301 can be mounted and fixed between the second cover plate 32 and the base 20, improving the stability of the current line terminal 301. Similarly, in this embodiment, the second cover plate 32 and the base 20 can be connected by bolts, snaps, or other means, which are not limited here. In addition, it should be noted that by dividing the cover body 30 into a first cover plate 31 and a second cover plate 32, the current line terminal 301 and the bar 201 can be installed separately. For example, the current line terminal 301 is first placed on the upper part of the base 20, and then the second cover plate 32 is closed; then the bar 201 is placed on the lower part of the base 20, and then the first cover plate 31 is closed. It can be seen that it is convenient to quickly assemble the current line terminal 301 and the bar 201 onto the clamping tool 100.

[0051] According to one embodiment of the present invention, when the cover 30 is installed on the base 20, the minimum thickness of the gap between the cover 30 and the base 20 is less than the thickness of the tab 201 of the square battery 200 by 0.3mm-0.7mm, or less than the thickness of the current line terminal 301 by 0.3mm-0.7mm.

[0052] The following takes the first cover plate 31 as an example to explain in detail that the gap between the cover body 30 and the base 20 is smaller than the thickness of the tab 201 of the square battery 200 (0.3 mm-0.7 mm).

[0053] When the first cover plate 31 is installed on the base 20, the minimum thickness of the gap between the first cover plate 31 and the base 20 is less than the thickness of the tab 201 of the square battery 200, which is 0.3mm-0.7mm. For example, the minimum thickness of the gap between the first cover plate 31 and the base 20 is less than the thickness of the tab 201 of the square battery 200, which is 0.3mm, 0.4mm, 0.5mm, 0.6mm, or 0.7mm. In this embodiment, by making the minimum distance between the base 20 and the first cover plate 31 0.3mm-0.7mm smaller than the thickness of the commonly used tab 201, it is helpful to ensure that the base 20 and the first cover plate 31 stably clamp the tab 201. Preferably, the thickness of the gap between the first cover plate 31 and the base 20 after installation is less than the thickness of the tab 201 of the square battery 200, which is 0.5mm, which can effectively prevent the tab 201 from loosening. That is, in this embodiment, by limiting the minimum distance between the installed base 20 and the first cover plate 31 to be smaller than the thickness of the commonly used tab 201 and 0.3mm-0.7mm smaller, the tab 201 can be tightly clamped by the base 20 and the first cover plate 31.

[0054] The following describes in detail the second cover plate 32 as an example of the gap between the cover 30 and the base 20 being smaller than the thickness of the current line terminal 301 by 0.3 mm to 0.7 mm.

[0055] The minimum distance between the second cover plate 32 and the base 20 after installation is 0.3 mm-0.7 mm smaller than the thickness of the current line terminal 301. For example, the minimum distance between the second cover plate 32 and the base 20 after installation is 0.3 mm, 0.4 mm, 0.5 mm or 0.7 mm smaller than the thickness of the current line terminal 301, so that the current line terminal 301 can be tightly clamped by the base 20 and the second cover plate 32.

[0056] According to an embodiment of the present invention, a tooth-shaped structure 21 is provided on one side of the base 20 and the cover 30 that are close to each other.

[0057] The following is a detailed description of the tooth structure 21 on the side where the base 20 and the first cover 31 are close to each other.

[0058] The side where the base 20 and the first cover plate 31 are close to each other has a tooth structure 21. That is to say, the part where the base 20 and the first cover plate 31 contact each other adopts a tooth structure 21, which can improve the contact effect. For example, when the same force is applied, 1.5 times the pressure will be generated, and the contact is better. In this embodiment, it is not limited to whether the tooth structure 21 is specifically set on the base 20 or the first cover plate 31. That is to say, the tooth structure 21 can be set on the side of the base 20 close to the first cover plate 31 alone, or the tooth structure 21 can be set on the side of the first cover plate 31 close to the base 20 alone, or the tooth structure 21 can be set on both the first cover plate 31 and the base 20. In this embodiment, by setting the tooth structure 21, the firmness with which the bar 201 and the current line terminal 301 are fixed can be improved.

[0059] Optionally, the base 20 is provided with a groove capable of accommodating the tab 201 and the current line terminal 301. Optionally, the bottom of the groove is processed into a tooth shape to form a tooth structure 21.

[0060] According to one embodiment of the present invention, the clamping fixture 100 for charging and discharging a square battery 200 further includes a locking structure 40, which is mounted on the base 10 and respectively connects the base 20 and the cover 30. In this embodiment, the locking structure 40 can further define the relative positional relationship between the base 20 and the cover 30, as well as the base 10, and can also be used to mount the base 20 on the base 10. Optionally, the locking structure 41 can include a bolt and a fixing portion 43, and the bolt and the fixing portion 43 can be connected by a threaded connection to achieve fixation between the bolt and the fixing portion 43.

[0061] The following is a detailed description taking the first locking member 41 installed on the first cover plate 31 as an example.

[0062] The clamping fixture 100 for charging and discharging tests of the prismatic battery 200 also includes a first locking member 41, which is used to connect the base 20 and the first cover 31. The first locking member 41 can define the relative position between the base 20 and the first cover 31. For example, the first locking member 41 can be a bolt, etc. The base 20 and the first cover 31 are each provided with a through hole, and the bolt passes through the two through holes in sequence. When the bolt is tightened, the base 20 and the first cover 31 can firmly clamp the tab 201, effectively preventing the tab 201 from loosening.

[0063] In some specific embodiments of the present invention, there are multiple locking structures 40 , and the fixing effect can be improved by using multiple locking structures 40 .

[0064] The following is a detailed description taking the multiple first locking members 41 installed on the base 20 as an example.

[0065] Multiple first locking members 41 can be provided on a base 20. For example, three first locking members 41 can ensure effective clamping and save costs. In this embodiment, multiple first locking members 41 can be used to lock the base 20 and the first cover 31, thereby increasing the pressure exerted by the base 20 and the first cover 31 on the tab 201, further ensuring tightness at the contact point, reducing contact impedance, and improving heat dissipation. Furthermore, providing multiple first locking members 41 can strengthen the fixation of the tab 201.

[0066] According to one embodiment of the present invention, the base 10 is provided with a mounting hole 122, into which the locking structure 40 extends to secure the base 20 to the base 10. For example, a through-hole, namely the mounting hole 122, is provided at the geometric center of the groove of the base 20, into which a first locking member 41 is mounted. Two additional through-holes are provided in the base 20, into which two more first locking members 41 are mounted. The three through-holes are spaced apart along the X-axis.

[0067] Optionally, a protrusion is provided on one side of the first upper cover 30 close to the base 20, and the protrusion can extend into the groove of the base 20, which can be defined as a tab side groove. The surface of the protrusion can be serrated to further ensure that the tab 201 can be firmly fixed.

[0068] For example, the connection method of the bar 201 is to place the bar 201 into the bar side groove of the base 20, and then place the first cover plate 31. The M6 fastening bolt can pass through the base 20 and the first cover plate 31 in turn, and the bolt head can be stuck in the hexagonal slot of the base 20. A flat washer, a spring washer and a nut are placed at the tail of the bolt. The M8 fastening bolt passes through the first cover plate 31, the bar 201, the base 20 and the bracket slot in turn, and a flat washer, a spring washer and a nut are placed at the tail of the bolt, and then tightened with a torque wrench until the torque reaches 3N*m.

[0069] The following is a detailed description taking the multiple second locking members 42 installed on the base 20 as an example.

[0070] The clamping fixture 100 for charging and discharging testing of the square battery 200 further includes a second locking member 42, which is used to connect the base 20 and the second cover 32. In this embodiment, the second locking member 42 can improve the clamping degree between the base 20 and the second cover 32.

[0071] According to one embodiment of the present invention, multiple second locking members 42 are provided on a single second cover plate 32. For example, three second locking members 42 can achieve both effective locking and low cost. In this embodiment, the use of multiple second locking members 42 improves the clamping force between the second cover plate 32 and the base 20. Furthermore, the provision of multiple second locking members 42 strengthens the securement of the current line terminal 301.

[0072] Optionally, a groove for accommodating the current line terminal 301 is provided on the side of the second cover plate 32 near the base 20, which can be defined as the current line side groove. The bottom of the groove can also be serrated to further ensure that the current line terminal 301 is securely fixed. Optionally, a through hole is provided at the geometric center of the groove of the second cover plate 32 to mount a second locking member 42. Two additional through holes are provided in the second cover plate 32 to mount two more second locking members 42, with the three through holes spaced apart along the X-axis.

[0073] For example, the connection method of the current line terminal 301 is to place the current line terminal 301 into the current line side groove set on the base 20, and then place it into the second cover plate 32, and pass the M6 fastening bolt through the base 20 and the second cover plate 32 in sequence. The bolt head can be stuck in the hexagonal slot of the base 20, and a flat washer, spring washer and nut are placed at the tail of the bolt. The M8 fastening bolt passes through the second cover plate 32, the current line terminal 301, the base 20 and the bracket slot in sequence, and a flat washer, spring washer and nut are placed at the tail of the bolt, and then tightened with a torque wrench until the torque reaches 3N*m.

[0074] In some embodiments of the present invention, the base 20 is made of nickel-plated copper. In this embodiment, the base 20 is made of nickel-plated copper to connect the tab 201 and the current line terminal 301. Copper has excellent electrical and thermal conductivity, ductility, and corrosion resistance. Its high conductivity ensures stable current transmission, reducing energy loss and heat generation. The nickel plating prevents oxidation during use, which can affect the copper's electrical and heat dissipation properties.

[0075] According to one embodiment of the present invention, the base 10 includes a first bracket 11 and a second bracket 12. The first bracket 11 extends along a first direction, and the second bracket 12 extends along a second direction. The second direction is at an angle to the first direction. For example, the first and second directions are perpendicular to each other. For ease of description, the first direction can be defined as the X-axis direction, and the second direction can be defined as the Z-axis direction. A base 20 is mounted on the second bracket 12, and the base 20 and the first bracket 11 are spaced apart in the second direction.

[0076] In this embodiment, by cooperating the first bracket 11 and the second bracket 12 with each other, the square battery 200 can be placed on the first bracket 11. In the second direction, the square battery 200 can be installed between the base 20 and the first bracket 11. By adopting the base 10 including the first bracket 11 and the second bracket 12, it is convenient to install the square battery 200 and the base 20. In addition, in the second direction, one side of the square battery 200 is limited by the first bracket 11, and the other side of the square battery 200 is limited by the base 20.

[0077] Optionally, two first connection parts 111 spaced apart along the X-axis direction are provided on the upper surface of the first bracket 11. The first connection part 111 includes four columns, forming two first slots 112 and two second slots 113. Each first slot 112 penetrates along the X-axis direction, and each second slot 113 penetrates along the Y-axis direction. The first slot 112 is communicated with the second slot 113. A third slot 121 penetrating along the Y-axis direction is provided at the lower end of the second bracket 12. When connecting the first bracket 11 and the second bracket 12, bolts can pass through the second slot 113, the third slot 121 and the second slot 113 in sequence. Optionally, the installation height of the base 20 can be controlled by the connection position of the first connection part 111 and the lower end of the second bracket 12 in the Z-axis direction, which can be applicable to square batteries 200 of various sizes.

[0078] In some specific embodiments of the present utility model, one end of the second bracket 12 close to the first bracket 11 has a hollow structure 123. For example, the second bracket 12 is a "C"-shaped part with an open bottom, which can reduce costs and weight, and can also avoid a part of the square battery 200 through the hollow structure 123. In addition, it can also ensure the heat dissipation of one side of the square battery 200 close to the second bracket 12.

[0079] Optionally, an installation through hole 122 extending along the X-axis direction is provided on the second bracket 12, and the installation through hole 122 penetrates along the Y-axis direction. In this embodiment, by adopting the installation through hole 122, the base 20 can be moved along the Y-axis direction, so that the position of the base 20 can be adjusted to realize the test of square batteries 200 with different width dimensions. The first locking part 41 or the second locking part 42 can pass through the installation through hole 122. For example, one end of a bolt passes through the installation through hole 122 and is connected to a nut.

[0080] Optionally, the number of the installation through holes 122 is two, and the two installation through holes 122 are spaced apart along the Z-axis direction. The upper installation through hole 122 can be used to translate the base 20 to adapt to square batteries 200 with different distances between the positive and negative poles. The lower installation through hole 122 can be used to fasten the tab 201, the base 20 and the first cover plate 31.

[0081] Optionally, a "C"-shaped member with an opening facing the Y-axis direction is formed by the cooperation among the first bracket 11, the second bracket 12 and the base 20, which can limit the degrees of freedom of the square battery 200 in the Z-axis direction.

[0082] The clamping tool 100 for charging and discharging tests of the square battery 200 according to the embodiments of the present invention will be described in detail below in conjunction with specific embodiments.

[0083] Embodiment

[0084] The base 10 includes a first bracket 11 and a second bracket 12. The first bracket 11 extends along the XY plane, the second bracket 12 extends along the XZ plane, and the lower end of the second bracket 12 is connected to the first bracket 11.

[0085] Two tabs 201 are provided at the upper end of the square battery 200. One tab 201 is connected to the positive electrode plate, and the other tab 201 is connected to the negative electrode plate. The two tabs 201 are spaced apart along the X-axis direction. In addition, each tab 201 is an L-shaped member. The tab 201 includes a horizontal limb extending along the XY plane and a vertical limb extending along the XZ plane. The horizontal limb is connected to the positive electrode plate or the negative electrode plate, and the vertical limb is located between the base 20 and the first cover plate 31. Similarly, a current line terminal 301 is clamped between the base 20 and the second cover plate 32.

[0086] During the test, as Figure 4 shown, the positive and negative current line terminals 301 of a certain test channel on the charge and discharge machine can be placed into the current line side groove of the base 20. The second cover plate 32 is placed. The M6 fastening bolt sequentially passes through the base 20 and the second cover plate 32. The head of the M6 bolt is stuck in the hexagonal card slot of the base 20. A flat washer, a spring washer and a nut are placed on the tail of the M6 bolt. The M8 fastening bolt sequentially passes through the second cover plate 32, the current line terminal 301 and the base 20. The M8 bolt passes through the groove on the upper side of the base 10. The base 20 is sleeved from the tail of the M8 bolt. Finally, a flat washer, a spring washer and a nut are sequentially placed on the tail of the M8 bolt. The distance between the two bases 20 is adjusted according to the pole post interval of different square shell batteries 200. After the distance is adjusted, the nuts on the M6 bolt and the nuts of the M8 bolt are tightened with a torque wrench to a torque of 3 N*m respectively.

[0087] As Figure 5As shown, the square shell battery 200 to be tested is placed on the first bracket 11. The height between the first bracket 11 and the second bracket 12 can be adjusted to accommodate square batteries 200 of different heights. The position of the square battery 200 is adjusted so that the bar 201 welded on the positive and negative poles is stuck in the bar side groove of the base 20, and the first cover 31 is placed. The M6 fastening bolt passes through the base 20 and the second cover 32 in turn. The bolt head can be stuck in the hexagonal slot of the base 20. A flat washer, a spring washer and a nut are placed on the tail of the M8 bolt. The M8 fastening bolt passes through the first cover 31, the bar 201, the base 20 and the upper notch of the second bracket 12 in turn. A flat washer, a spring washer and a nut are placed on the tail of the M8 bolt, and tightened with a torque wrench until the torque reaches 3N*m.

[0088] In summary, the clamping fixture 100 for charging and discharging testing of square batteries 200 according to an embodiment of the utility model adopts a combination of a base 10, a base 20 and a first cover plate 31, which can solve the problems of small contact area and poor connection between the tab 201 and the current line terminal 301. By increasing the contact area, increasing the pressure at the connection, reducing the contact impedance, and enhancing heat dissipation, the authenticity of the test data is ensured and the test safety is improved.

[0089] Although some specific embodiments of the present invention have been described in detail through examples, those skilled in the art will appreciate that the above examples are for illustration only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A clamping fixture (100) for charging and discharging testing of a square battery (200), characterized in that: include: A base (10), wherein the base (10) has a receiving space, and the receiving space is used to install a square battery (200); A base (20), the base (20) being mounted on the base (10), the base (20) being a conductive member and being suitable for connecting the tab (201) of the square battery (200) and the current line terminal (301); The cover (30) is detachably mounted on the base (20). When the cover (30) is mounted on the base (20), the tab (201) and the current line terminal (301) of the square battery (200) are clamped between the cover (30) and the base (20).

2. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: When the cover (30) is mounted on the base (20), the minimum thickness of the gap between the cover (30) and the base (20) is less than the thickness of the tab (201) of the square battery (200) by 0.3 mm to 0.7 mm, or less than the thickness of the current line terminal (301) by 0.3 mm to 0.7 mm.

3. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: The base (20) and the cover (30) have a tooth-shaped structure (21) on one side where they are close to each other.

4. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: Also includes: A locking structure (40) is installed on the base (10) and is respectively connected to the base (20) and the cover (30).

5. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 4, characterized in that: The base (10) is provided with a mounting through hole (122), and the locking structure (40) extends into the mounting through hole (122) so that the base (20) is fixed on the base (10).

6. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 4, characterized in that: The number of the locking structures (40) is multiple.

7. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: The cover (30) comprises: a first cover plate (31), the first cover plate (31) being detachably mounted on the base (20); when the first cover plate (31) is mounted on the base (20), a tab (201) holding a square battery (200) is sandwiched between the first cover plate (31) and the base (20); A second cover plate (32), the second cover plate (32) is opposite to the base (20), and a current line terminal (301) is clamped between the second cover plate (32) and the base (20).

8. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: The base (20) is a nickel-plated copper piece.

9. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 1, characterized in that: The base (10) comprises: A first bracket (11), the first bracket (11) extending along a first direction; A second bracket (12), the second bracket (12) extends along a second direction, the second direction and the first direction form an included angle, the base (20) is mounted on the second bracket (12), and the base (20) and the first bracket (11) are spaced apart and distributed in the second direction.

10. The clamping fixture (100) for charging and discharging testing of a square battery (200) according to claim 9, characterized in that: One end of the second bracket (12) close to the first bracket (11) has a hollow structure (123).

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