Device for fixing battery pack and device for squeezing test of battery pack

Abstract

The utility model relates to an auxiliary device for battery manufacturing, in particular to a device for fixing a battery pack and a device for a battery pack extrusion test. A device for fixing a battery pack comprises: a base for supporting the battery pack; the fixing assembly is arranged on the top face of the base, the fixing assembly is used for fixing the battery pack, the fixing assembly is provided with a plurality of fixing units, and the fixing units can be close to or away from the side face of the battery pack. The utility model discloses a device for fixing a battery pack, and solves the technical problems in the prior art that in a battery pack extrusion test, the battery pack is directly tested without being fixed, so that the result of the extrusion test is influenced; or a fixing device with a cavity consistent with the shape of the battery pack is used for fixing, but the device is only suitable for the battery pack with the corresponding shape and size, and is not suitable for carrying out extrusion test on other surfaces of the same battery pack.

Description

Technical Field

[0001] The utility model relates to an auxiliary device for battery manufacturing, in particular to a device for fixing a battery pack and a device for battery pack extrusion testing. Background Art

[0002] Battery extrusion testing is a means of safety performance evaluation, and its main purpose is to ensure that the battery will not catch fire, explode or other dangerous situations when suffering external mechanical pressure. This test is crucial for various types of batteries, including but not limited to dry batteries, lead-acid batteries, lithium batteries, lithium iron phosphate batteries, and power batteries for various portable electronic devices and electric vehicles.

[0003] During the test, the fully charged battery pack is placed in the test equipment, and usually a hydraulic system is used to apply the extrusion force. The extrusion direction is selected according to the actual installation position of the battery in the vehicle, and the direction that is most vulnerable to extrusion is chosen, and each side of the battery pack needs to be extruded. The extrusion force is usually set according to relevant standards. During the test, the battery pack should not catch fire, explode, the temperature rise should be within a safe range, and no smoke or toxic gas should be released. After the test, the possible leakage or deformation of the battery pack is also within the scope of evaluation. When conducting the battery pack extrusion test, either no fixing device is set to fix the battery pack, or a fixing device that completely fits the battery pack is set to fix the battery pack.

[0004] However, the above two methods have corresponding problems: one is that the battery pack is directly tested without being fixed, which may affect the accuracy of the test results; the other is that although a fixing device with a fixing cavity that completely matches the shape of the battery pack is used to improve the pertinence of the test, this method has limitations, only suitable for battery packs with specific shapes and sizes, and cannot be flexibly applied to the test of different pressed surfaces of the same battery pack. These two situations both highlight the deficiencies of the existing fixing schemes in terms of universality and test accuracy. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the problems existing in the prior art that in the battery pack extrusion test, directly testing the battery pack without fixing it will affect the result of the extrusion test; or using a fixing device with a cavity having the same shape as the battery pack for fixing, but it is only applicable to battery packs with corresponding shapes and sizes. The utility model provides a device for fixing a battery pack and a device for battery pack extrusion testing.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A device for fixing a battery pack, comprising:

[0008] A base, which is used to support the battery pack;

[0009] Fixing component, the fixing component is arranged on the top surface of the base, the fixing component is used for fixing the battery pack, the fixing component is provided with a plurality of fixing units, and the fixing units can approach or be away from the side surface of the battery pack.

[0010] The side surface of the battery pack is the surface of the battery pack that is not squeezed and does not face the top surface of the base directly. The fixing component includes a plurality of fixing units, and the distance from the fixing unit to the side surface of the battery pack is adjustable, so that it can be adapted to battery packs of different shapes and sizes. And when the squeezed surface of the same battery pack is replaced, the positions of the plurality of fixing units can also be adjusted, so that the cavity formed by the fixing units is adapted to the squeezed surface. Compared with the prior art in which either the battery pack is not fixed or a one-time fixing device with a fixed cavity that completely matches the shape of the battery pack is used, this device can fix the battery pack, prevent unnecessary movement or distortion of the battery pack when an extrusion force is applied, which helps to ensure that the test results reflect the true response to frontal extrusion, rather than additional deformation or damage caused by unstable fixing. And the fixing device is applicable to battery packs of different sizes and shapes, can be reused, and is beneficial to saving production costs. And when one side of the same battery pack has completed the extrusion test, the plurality of fixing units are adjusted so that the shape of the fixing cavity formed by the plurality of fixing units is adapted to the side surface of the battery pack, which can minimize the production of fixing components with different fixing cavity shapes and save the test cost.

[0011] As a preferred solution of the present invention, the fixing component further includes a fixing part, the fixing part is used for enclosing the battery pack, the fixing unit extends into the enclosed area of the fixing part, and the length of the fixing unit extending into the enclosed area of the fixing part is adjustable.

[0012] There are two cases for the fixing unit: one is that it does not change its own length, and the length extending into the enclosed area of the fixing part is adjusted by adjusting its own position; the other is that it can change its own length, and the length extending into the enclosed area of the fixing part is adjusted by changing its own length. The fixing part encloses the battery pack, and the fixing unit extends into the area enclosed by the fixing part. When one side of the battery pack is squeezed, the fixing unit supports the side surface of the battery pack, which is beneficial to ensuring the test accuracy, and can also prevent the battery pack from accidentally falling out of the base or breaking during the test, reducing potential safety risks.

[0013] As a preferred solution of the present invention, the fixing part includes a hole plate, the plane where the hole plate is located forms an angle with the plane where the top surface of the base is located, and a plurality of the fixing units all pass through the through holes of the hole plate.

[0014] If there is an included angle between the plane where the orifice plate is located and the plane where the supporting plate is located, then the plane where the orifice plate is located is not parallel to the plane where the supporting plate is located. The orifice plate can enclose the battery pack, and the fixing unit passes through the through hole of the orifice plate and abuts against the side surface of the battery pack, so that it can ensure as much as possible that the side surface adjacent to the extrusion surface of the battery pack can be supported by the fixing unit, and the test accuracy can be ensured as much as possible.

[0015] As a preferred solution of the present utility model, the fixing part is connected to the fixing unit through a spring, and the fixing unit can abut against the side surface of the battery pack under the action of elastic force.

[0016] If there is a force interaction between the fixing unit and the side surface of the battery pack, then the fixing unit can provide support for the side surface of the battery pack.

[0017] As a preferred solution of the present utility model, the fixing part is provided with a limiting groove, the fixing unit extends into the limiting groove, and the fixing unit can move along the axis of the limiting groove.

[0018] The fixing unit extends into the limiting groove, and the fixing unit can only move along the axis of the limiting groove, so that the fixing unit can be prevented from generating deviation and affecting the fixing effect on the battery pack, thereby affecting the accuracy of the test result.

[0019] As a preferred solution of the present utility model, the fixing assembly includes an orifice plate, the plane where the orifice plate is located is parallel to the plane where the top surface of the base is located, and the top surface of the base is provided with a plurality of through holes corresponding to the orifice plate.

[0020] The plane where the orifice plate is located is parallel to the plane where the top surface of the base is located, and the axis of the through hole of the orifice plate is perpendicular to the plane where the orifice plate is located. And the top surface of the base is provided with a plurality of through holes corresponding to the orifice plate. When the battery pack is placed on the top surface of the base, find the corresponding through hole on the orifice plate, and the fixing unit passes through the corresponding through hole, and the side surface of the fixing unit supports the battery pack.

[0021] As a preferred solution of the present utility model, a cushion plate is detachably arranged on the top surface of the base, and the top surface shape of the cushion plate matches the surface shape of the battery pack.

[0022] The cushion plate is arranged on the top surface of the base, so the opposite surface of the cushion plate and the extrusion surface are in contact with each other. The top surface shape of the cushion plate is in concave-convex fit with the battery pack. When the battery pack is extruded, the pressure transmitted by the extrusion part can be evenly distributed on the surface of the battery pack in contact with it, reducing the local stress concentration phenomenon, so that the test result can better reflect the overall anti-extrusion performance of the battery pack, rather than simply local failure caused by uneven contact surface or uneven pressure. The cushion plate is detachably connected to the top surface of the base, so different-shaped cushion plates can be replaced according to the surface shape of the battery pack.

[0023] As a preferred embodiment of the present utility model, the fixing assembly further includes a locking member, and the locking member can lock the fixing unit.

[0024] The locking member locks the fixing unit to prevent the fixing unit from shifting in position during the extrusion test, which may affect the accuracy of the test results.

[0025] As a preferred embodiment of the present utility model, the base includes a supporting plate and a bottom plate, and the included angle between the supporting plate and the bottom plate is adjustable.

[0026] If the included angle between the supporting plate and the bottom plate is adjustable, the battery pack can be applicable to extrusion tests in more situations, and can more realistically simulate the extrusion that the battery pack may receive in actual situations, which is conducive to improving the credibility of the test.

[0027] A device for testing the extrusion of a battery pack includes an extrusion member and a device for fixing a battery pack as described above, and the extrusion member is used to extrude the battery pack.

[0028] The extrusion test device includes a device for fixing a battery pack as described above. By fixing the side of the battery pack, it can prevent the battery pack from moving or twisting unnecessarily when an extrusion force is applied, which helps to ensure that the test results reflect the true response to frontal extrusion, rather than additional deformation or damage caused by unstable fixing. And the fixing assembly can be applicable to battery packs of different sizes and shapes, reducing the one-time use of the fixing device, which is conducive to reducing production costs.

[0029] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present utility model are as follows:

[0030] 1. A device for fixing a battery pack includes a base and a fixing assembly. The fixing assembly is arranged on the top surface of the base and is used to fix the battery pack during the extrusion test of the battery pack. It can prevent the battery pack from moving or twisting unnecessarily when an extrusion force is applied, which helps to ensure that the test results reflect the true response to frontal extrusion; it can also prevent the battery pack from accidentally coming out or breaking during the test, reducing potential safety risks; and it can simulate the restraint of the structure (such as the vehicle frame) around the battery on the battery pack during actual collisions or extrusions by fixing the battery pack. The fixing assembly is provided with a plurality of fixing units, and the fixing units can approach or move away from the side of the battery pack. By adjusting the plurality of adjustable fixing units, the shape and size of the fixing cavity formed by the fixing units can be matched to different battery packs, and it can be reused, which is conducive to saving production costs. This device solves the problems in the prior art that in the extrusion test of the battery pack, if the battery pack is not fixed directly for testing, it will affect the results of the extrusion test; or a fixing device with a cavity having the same shape as the battery pack is used for fixing, but it is only applicable to battery packs with corresponding shapes and sizes.

[0031] 2. A device for squeezing test of a battery pack, comprising a squeezing member and a device for fixing a battery pack as described above, which can fix the battery pack during the squeezing test, facilitating the guarantee of the accuracy of the squeezing test; and can be adapted to battery packs of different sizes and shapes, facilitating the saving of production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic structural diagram of a device for fixing a battery pack in Embodiment 1;

[0033] Figure 2 is a schematic structure of the fixing component in Embodiment 1 Figure 1 ;

[0034] Figure 3 is a schematic structure of the fixing component in Embodiment 1 Figure 2 ;

[0035] Figure 4 is a schematic structure of the fixing component in Embodiment 1 Figure 3 ;

[0036] Figure 5 is a schematic structural diagram of the fixing unit in Embodiment 1;

[0037] Figure 6 is an exploded view of the fixing unit in Embodiment 1;

[0038] Figure 7 is a cross-sectional view of the pressing head in Embodiment 1;

[0039] Figure 8 is a schematic structural diagram of the base in Embodiment 1;

[0040] Figure 9 is a schematic structural diagram of a device for squeezing test of a battery pack in Embodiment 2;

[0041] ICON: 1 - fixing tabletop, 2 - squeezing member, 3 - battery pack, 4 - base, 401 - supporting plate, 402 - bottom plate, 5 - hole plate, 6 - fixing unit, 601 - pressing head, 602 - locking nut, 603 - locking screw, 7 - connecting plate, 8 - cushion plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following will be a detailed description of the present invention with reference to the drawings.

[0043] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] In the description of the following specific embodiments, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the device / device is normally used and placed. These terms of orientation or positional relationship are only for the convenience of description or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present utility model.

[0045] Terms such as "horizontal" and "vertical" do not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in a specific direction such as "horizontal" or "vertical", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present utility model.

[0046] Expressions such as "first", "second", "third", etc. are only used to distinguish the description of the same or similar components, and should not be construed as emphasizing or implying the relative importance of specific components.

[0047] The places where the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, and threaded connection. It can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0048] Embodiment 1

[0049] As Figure 1 shown, a device for fixing a battery pack includes: a base 4, and the base 4 is used to support the battery pack 3; a fixing component, the fixing component is arranged on the top surface of the base 4, the fixing component is used to fix the battery pack 3, the fixing component is provided with a plurality of fixing units 6, and the fixing units 6 can approach or be away from the side surface of the battery pack 3. The side surface of the battery pack 3 is the surface of the battery pack 3 that is not squeezed and does not face the top surface of the base 4 directly. Figure 1 The side of the battery pack 3 facing away from the base 4 is the squeezed surface.

[0050] As shown Figure 8 in the figure, the base 4 includes a supporting plate 401 and a bottom plate 402, and the included angle between the supporting plate 401 and the bottom plate 402 is adjustable. Since the included angle between the supporting plate 401 and the bottom plate 402 is adjustable, the battery pack 3 can be applicable to extrusion tests in more situations, and can more truly simulate the extrusion that the battery pack 3 may receive in actual situations, which is beneficial to improving the credibility of the test. In this embodiment, the supporting plate 401 is a circular plate, and a plurality of through holes are provided on the periphery, and the plurality of through holes are spaced along the circumferential direction of the supporting plate 401. The bottom plate 402 is a square plate, and a number of through holes are spaced on the periphery of the square plate.

[0051] As shown Figures 1 - 4 in the figure, the fixing assembly further includes a hole plate 5, and the hole plate 5 is connected to the supporting plate 401 through a connecting plate 7. The connecting plate 7 is in contact with the supporting plate 401. As shown Figure 3 and Figure 4 in the figure, the connecting plate 7 is provided with two positioning holes, and the distance between the two positioning holes is equal to the distance between two through holes on the same diameter on the periphery of the supporting plate 401. With such a setting, the direction of connecting the connecting plate 7 to the supporting plate 401 can be changed, which is convenient for the battery pack 3 to receive extrusion tests at various angles, and is beneficial to improving the credibility of the test.

[0052] In this embodiment, there are a total of four hole plates 5, and each hole plate 5 is perpendicular to the supporting plate 401. The four hole plates 5 enclose a fixing cavity, and the battery pack 3 is placed inside the fixing cavity. The size of the fixing cavity is larger than the size of the existing battery pack. A plurality of the fixing units 6 all pass through the through holes of the hole plate 5, and a plurality of the fixing units 6 are all detachably connected to the hole plate 5. Since a plurality of the fixing units 6 are detachably connected to the hole plate 5, the corresponding through holes can be found on the hole plate 5 according to the shape of the battery pack 3, and the fixing units 6 pass through the through holes, so that the shape of the fixing cavity formed by the plurality of fixing units 6 is adapted to the shape of the battery pack 3. When one side of the battery pack 3 is being extruded, the fixing units 6 support the side surface, which is beneficial to ensuring the test accuracy, and can also prevent the battery pack 3 from accidentally coming out or breaking during the test, reducing potential safety risks.

[0053] As shown Figure 5 and Figure 6 in the figure, in this embodiment, the fixing unit 6 includes a pressing head 601, a locking nut 602 and a locking screw 603. As shown Figure 7 in the figure, a cavity is provided inside the pressing head 601, and the locking screw 603 can extend into the cavity. As shown Figures 1 - 4As shown, in actual use, the indenter 601 is located within the fixed cavity formed by the four orifice plates 5. When installing the fixing unit 6 to the orifice plate 5, first remove the indenter 601 so that the locking screw 603 passes through the through-hole of the orifice plate 5, determine the length of the locking screw 603 extending into the fixed cavity formed by the four orifice plates 5, sleevethe indenter 601 onto one end of the locking screw 603, and adjust the position of the locking nut 602 so that the fixing unit 6 is fixed to the orifice plate 5, ensuring that the indenter 601 is in contact with the battery pack 3, then the locking of the fixing unit 6 is completed. In this embodiment, the indenter 601 is in the form of a ball head. However, during actual use, the shape of the indenter 601 can be changed according to the actual use environment of the battery pack 3, making the constraints around the battery pack 3 closer to the actual use environment, which is beneficial to improving the credibility of the extrusion test.

[0054] The fixing assembly can be replaced with the following three forms:

[0055] The first form is: The fixing assembly includes the orifice plate 5. The orifice plate 5 is parallel to the connecting plate 7 (this form is not shown in the attached drawings of the specification). The axis of the through-hole of the orifice plate 5 is perpendicular to the plane where the orifice plate 5 is located. The supporting plate 401 is provided with a plurality of through-holes corresponding to the orifice plate 5. For the fixing assembly of this form, the locking nut 602 and the locking screw 603 are still used as the fixing unit. After the locking screw 603 passes through the corresponding through-hole, the locking nut 602 is used for locking. A buffer can be provided between the fixing unit and the battery pack 3 to prevent the battery pack from being broken by hard objects, affecting the result of the extrusion test and also posing a safety hazard.

[0056] The second form is: The fixing assembly further includes a fixing part (not shown in the figure). The fixing part is used to enclose the battery pack 3. One side of the fixing unit 6 is connected to the fixing part through a spring (not shown in the figure), and the other side faces the inner side of the area enclosed by the fixing part. The fixing unit can abut against the side of the battery pack 3 under the action of the elastic force. When the battery pack 3 is placed in the area enclosed by the fixing part, the spring is in a compressed state.

[0057] The fixing part is provided with a limiting groove. The fixing unit 6 extends into the limiting groove, and the fixing unit 6 can only move along the axis of the limiting groove. The fixing unit 6 extends into the limiting groove and can only move along the axis of the limiting groove, which can prevent the fixing unit 6 from shifting and affecting the fixing effect on the battery pack 3, thus affecting the accuracy of the test result.

[0058] The third form is: The fixing unit 6 is a telescopic rod (not shown in the figure). One end of the telescopic rod is fixed to the fixing part, and the other end faces the battery pack 3. By adjusting the length of the telescopic rod itself, the telescopic rod abuts against the side of the battery pack 3. The telescopic rod is equipped with a locking member and can lock its own length.

[0059] A cushion plate 8 is detachably arranged on the top surface of the supporting plate 401, and the top surface shape of the cushion plate 8 is in concave-convex fit with the battery pack 3. Since the cushion plate 8 is arranged on the top surface of the supporting plate 401, the opposite surfaces of the cushion plate 8 and the extrusion surface are in contact with each other. With the top surface shape of the cushion plate 8 being in concave-convex fit with the battery pack 3, when the battery pack 3 is extruded, the pressure transmitted by the extrusion member 2 can be evenly distributed on the surface of the battery pack 3 in contact therewith, reducing the phenomenon of local stress concentration, so that the test result can better reflect the overall anti-extrusion performance of the battery pack 3, rather than local failure simply caused by uneven contact surfaces or uneven pressure. Since the cushion plate 8 is detachably connected to the top surface of the base 4, different-shaped cushion plates 8 can be replaced according to the surface shape of the battery pack 3.

[0060] Embodiment 2

[0061] As Figure 9 shown, a device for testing the extrusion of a battery pack includes an extrusion member 2 and a device for fixing a battery pack as in Embodiment 1, and the extrusion member 2 is used to extrude the battery pack 3. A bottom plate 402 is connected to the fixed tabletop 1. Through holes are provided in both the bottom plate 402 and the fixed tabletop 1, and the base 4 can be fixed when the through holes of the bottom plate 402 and the fixed tabletop 1 are aligned. Since multiple through holes are provided in the fixed tabletop 1, the bottom plate 402 can be replaced and connected to different positions on the fixed tabletop 1, facilitating the extrusion of various parts of the battery pack 3 and helping to improve the credibility of the test results.

[0062] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A device for fixing a battery pack, characterized in that, Comprising: A base (4) for supporting a battery pack (3); A fixing component disposed on the top surface of the base (4) for fixing the battery pack (3), the fixing component being provided with a plurality of fixing units (6) capable of approaching or moving away from the side surface of the battery pack (3).

2. The device for fixing a battery pack according to claim 1, characterized in that, The fixing component further includes a fixing portion for enclosing the battery pack (3), the fixing unit (6) extending into the enclosed area of the fixing portion, and the length of the fixing unit (6) extending into the enclosed area of the fixing portion being adjustable.

3. The device for fixing a battery pack according to claim 2, wherein, The fixing portion includes a perforated plate (5), the plane of the perforated plate (5) forming an angle with the plane of the top surface of the base (4), and a plurality of the fixing units (6) all passing through the through holes of the perforated plate (5).

4. A device for fixing a battery pack according to claim 3, characterized in that, The fixing portion is connected to the fixing unit (6) by a spring, and the fixing unit can abut against the side surface of the battery pack (3) under the action of elastic force.

5. The device for fixing a battery pack according to claim 4, characterized in that, The fixing portion is provided with a limiting groove, the fixing unit (6) extending into the limiting groove, and the fixing unit (6) being capable of moving along the axis of the limiting groove.

6. The device for fixing a battery pack according to claim 1, wherein, The fixing component includes a perforated plate (5), the plane of the perforated plate (5) being parallel to the plane of the top surface of the base (4), and the top surface of the base (4) being provided with a plurality of through holes corresponding to the perforated plate (5).

7. A device for fixing a battery pack according to any one of claims 1-6, characterized in that, A cushion plate (8) is detachably disposed on the top surface of the base (4), and the top surface shape of the cushion plate (8) matches the surface shape of the battery pack (3).

8. A device for fixing a battery pack according to any one of claims 1-6, characterized in that, The fixing component further includes a locking member capable of locking the fixing unit (6).

9. A device for fixing a battery pack according to any one of claims 1-6, characterized in that, The base (4) includes a supporting plate (401) and a bottom plate (402), and the angle between the supporting plate (401) and the bottom plate (402) is adjustable.

10. A device for battery pack extrusion test, characterized in that, Comprising a pressing member (2) and a device for fixing a battery pack according to any one of claims 1-9, the pressing member (2) being used for pressing the battery pack (3).

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