Mounting device for forming batteries and test equipment

Abstract

Fastening device for forming batteries, characterized in that it is used for fastening a battery (8), wherein the fastening device for forming batteries comprises the following: a base plate (1); a first boundary assembly comprising two positioning elements (6), wherein the two positioning elements (6) are provided relative to each other on the base plate (1), wherein the battery (8) rests against the two positioning elements (6); a second limiting assembly provided on the base plate (1) and located between two of the positioning elements (6), wherein the second limiting assembly comprises a mounting plate (3) and at least one clamping plate (4), wherein the mounting plate (3) is fixed relative to the base plate (1), wherein the clamping plate (4) is provided to slide relative to the base plate (1), and wherein a battery receiving space is formed between the clamping plate (4) and the mounting plate (3) and between the adjacent clamping plates (4); an elastic element (5) provided between the mounting plate (3) and the battery (8) and / or between the clamping plate (4) and the battery (8), wherein the area ratio between the elastic element (5) and the clamping plate (4) is in a range of 0.9-1.

Description

Technical field

[0001] The present invention relates to the technical field of new energy batteries, in particular a fastening device for forming batteries and a testing device. Technical background

[0002] With the continuous development of new energy technology, new energy batteries have been widely used as environmentally friendly energy storage and release devices in energy storage systems such as hydroelectric, thermal, wind and solar power plants, as well as in a variety of technical fields such as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace, etc.

[0003] During battery manufacturing, the battery must be tested for airtightness (i.e., a helium test) after the sealing nails have been welded. The airtightness test procedure involves filling the battery with a specific amount of helium, placing the battery in a cavity under high vacuum, and determining whether the battery's airtightness is intact by measuring the amount of helium in the cavity. However, since the atmospheric pressure inside the battery is approximately -37.5 kPa, while the atmospheric pressure in the cavity is -100 kPa, a large pressure differential forms between the inside and outside of the battery. The gas expansion of the electrical core inside the battery is then solely dependent on the electrode foil, which has a low holding force.The pressure difference described above causes the gap between the electrode foils on the outside to widen, hindering the flow of lithium embedded in the battery during charging. This increases the lithium-ion transfer distance, leading to brown and black spots on the outer terminal of the battery and accompanied by lithium deposition problems. This results in rapid cyclic degradation of battery capacity and reduces the battery's lifespan. Content of the invention

[0004] In view of this, the present invention provides a fastening device for forming batteries and a testing device to solve the problem that existing batteries tend to produce brown spots and black spots on the outer electrode foils after airtightness testing, accompanied by lithium precipitates that impair the battery's performance.

[0005] According to a first aspect, the present invention provides a fastening device for forming batteries, which is used to fasten a battery, wherein the fastening device for forming batteries comprises the following: a base plate; a first boundary assembly comprising two positioning elements, wherein the two positioning elements are provided relative to each other on the base plate, with the battery resting against the two positioning elements; a second limiting assembly provided on the base plate and located between two of the positioning elements, wherein the second limiting assembly comprises a mounting plate and at least one clamping plate, wherein the mounting plate is fixed relative to the base plate, wherein the clamping plate is provided to slide relative to the base plate, and wherein a battery receiving space is formed between the clamping plate and the mounting plate and between the adjacent clamping plates; an elastic element provided between the mounting plate and the battery and / or between the clamping plate and the battery, wherein the area ratio between the elastic element and the clamping plate is in a range of 0.9-1.

[0006] Advantageous Effects: In the battery forming device of the present invention, a first limiting assembly and a second limiting assembly are provided to limit the battery, and the second limiting assembly can clamp and secure the battery. When the battery is subjected to an airtightness test, the limiting effect of the first limiting assembly and the second limiting assembly makes it possible to apply external pressure to the battery, reducing the expansion of the electrical core, preventing the gap between the outer electrode foils of the battery from widening, and making it less likely that the battery will develop brown spots, black spots, and the associated lithium precipitation and other problems after the airtightness test, thus improving battery performance.Furthermore, the elastic element is used to fill the gap between the terminal plate and the battery, or between the mounting plate and the battery, which can improve the effectiveness of the second limiting assembly in resisting and limiting the battery. If the area of ​​the elastic element is too small, it cannot effectively resist the pressure on the larger side of the battery. By limiting the ratio of the elastic element's area to the terminal plate's area to 0.9-1, the size of the elastic element is made more suitable for resisting the battery, thus improving its limiting effect.

[0007] According to a second aspect, the present invention further provides a testing device for testing the airtightness of a battery, wherein the testing device comprises the above-mentioned fastening device for forming batteries.

[0008] Since the test apparatus of the present invention comprises the fastening device for forming batteries of the present invention, with the same advantageous effects as the fastening device for forming batteries, it will not be repeated here. Images

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention or of the prior art, the accompanying drawings, which are to be used in the specific embodiments of the present invention or of the prior art, are briefly described below. Of course, the accompanying drawings described below represent some of the embodiments of the present invention, and other accompanying drawings can be derived from the accompanying drawings by a person with normal technical knowledge without any creative effort. Fig. Figure 1 shows a schematic representation of a testing device of the present invention; Fig. Figure 2 shows a schematic representation of the partial structure of a fastening device for forming batteries of the present invention. Reference symbol list:

[0010] 1. Base plate; 2. Edging; 3. Mounting plate; 4. Clamping plate; 5. Elastic element; 6. Positioning element; 7. Clamping block; 8. Battery; 9. Bevel. Description of embodiments

[0011] The technical solution in the embodiments of the present invention is explained clearly and completely below in combination with the accompanying figures of these embodiments, so that the purpose, the technical solutions, and the advantages of the embodiments of the present invention become clearer. Obviously, the described embodiments do not represent all embodiments, but only a subset of them. All other embodiments that a person skilled in the art might creatively derive from the embodiments in the present invention should be considered to be covered by the scope of protection of the present invention.

[0012] An embodiment of the fastening device for forming batteries and the test device of the present invention is described below in conjunction with the Fig. 1 and Fig. 2 described.

[0013] According to the exemplary embodiments of the present invention, a first aspect is a fastening device for forming batteries, comprising a base plate 1, a first limiting assembly, a second limiting assembly and an elastic element 5, wherein the first limiting assembly comprises two positioning elements 6, wherein the two positioning elements 6 are provided relative to each other on the base plate 1, wherein the battery 8 rests against the two positioning elements 6; wherein the second limiting assembly is provided on the base plate 1 and is located between two of the surrounds 2, wherein the second limiting assembly comprises a mounting plate 3 and at least one clamping plate 4, wherein the mounting plate 3 is fixed relative to the base plate 1, wherein the clamping plate 4 is provided to slide relative to the base plate 1, wherein a battery receiving space is formed between the clamping plate 4 and the mounting plate 3 and between the adjacent clamping plates 4;wherein the elastic element 5 is provided between the mounting plate 3 and the battery 8 and / or between the clamping plate 4 and the battery 8, wherein the area ratio between the elastic element 5 and the clamping plate 4 is in a range of 0.9-1.;

[0014] The battery forming fixture includes a first limiting assembly and a second limiting assembly to confine the battery 8. The second limiting assembly clamps and secures the battery 8. When the battery 8 undergoes an airtightness test, the limiting effect of the first and second limiting assemblies allows for the external application of pressure to the battery 8. This reduces the expansion of the electrical core, prevents the gap between the outer electrode foils of the battery 8 from widening, and makes it less likely that the battery 8 will develop brown spots, black spots, and the associated lithium precipitation and other problems after the airtightness test, thus improving battery performance.Furthermore, the elastic element 5 is used to fill the gap between the clamping plate 4 and the battery 8, or it is used to fill the gap between the mounting plate 3 and the battery 8, which can improve the effect of the second limiting assembly in resisting and limiting the battery 8. If the area of ​​the elastic element 5 is too small, it cannot fulfill its role of resisting the pressure on the larger side of the battery 8. By limiting the area ratio of the elastic element 5 to the clamping plate 4 to 0.9-1, the size of the elastic element 5 is made more suitable for resisting the battery 8, and the limiting effect on the battery 8 is improved.

[0015] The battery mounting device of this embodiment is suitable for mounting stacked batteries. In this embodiment, the larger side of the battery refers to a side of the battery with a relatively large outer surface area, and the smaller side of the battery refers to a side of the battery with a relatively small outer surface area.

[0016] The fastening device for forming batteries of this embodiment is capable of bearing against the battery 8 in the first direction and causing the battery 8 to be limited in the first direction by providing the first limiting assembly, and is capable of clamping the battery 8 in the second direction and causing the battery 8 to be limited in the second direction by providing the second limiting assembly. The first direction is that indicated by arrows a and a' in Fig. The first direction is indicated, the second direction is that shown by arrows b and b' in Fig. The first direction is specified, the second direction is parallel to the direction in which the clamping plate 4 slides relative to the base plate 1, and the first direction is perpendicular to the second direction. The battery forming fixture of this embodiment is capable of securing the battery 8 and can be used in battery manufacturing, testing, and other processes. In this embodiment, the battery forming fixture is used in the battery airtightness testing procedure.The first limiting assembly is able to limit the battery 8 in a first direction, while the second limiting assembly is able to exert a pressure force on the battery 8 in a second direction, so that the position of the battery 8 is fixed and the expansion of the electrical core can be reduced, thus preventing the gap of the outer electrode of the battery from increasing.

[0017] In particular, the base plate 1 is a supporting structure of the battery forming device, on which other structures and components of the battery forming device can be provided, and the base plate 1 has a certain structural strength. In this embodiment, the base plate 1 is a flat, plate-like structure that can be placed on a platform, such as a desk, an operating table, and the like.

[0018] A first boundary assembly is provided on the base plate 1, and the first boundary assembly comprises two positioning elements 6, and the two positioning elements 6 are attached to the base plate 1 relative to each other. In particular, the positioning elements 6 have a flat, plate-like structure and are of the same size, the two positioning elements 6 are perpendicular to the base plate 1, the two positioning elements 6 are arranged parallel to each other and relative to each other, and an adjustment space is formed between the two positioning elements 6 in which the second boundary assembly and the battery 8 can be accommodated.

[0019] Optionally, the distance between the two positioning elements 6 should correspond to the dimensions of the battery 8 in the first direction, so that after the battery 8 is placed in the adjustment space, both positioning elements 6 can be pressed against the battery 8 to reliably limit its size. Specifically, both positioning elements 6 rest against the smaller side of the battery.

[0020] The second limiting assembly is provided on the base plate 1 and is located in the adjustment space formed by the two positioning elements 6. The second limiting assembly consists of a mounting plate 3 and at least one clamping plate 4. The mounting plate 3 is fixed relative to the base plate 1, and since the positioning elements 6 are attached to the base plate 1, the mounting plate 3 is also fixed relative to the positioning elements 6. The clamping plate 4 is slidably mounted relative to the base plate 1, and since the positioning element 6 is attached to the base plate 1, the clamping plate 4 is also slidably mounted relative to the positioning element 6. Depending on the number of batteries and the need to secure them, the clamping plate 4 can be provided with one, two, three, five, and the like.

[0021] In this embodiment, one end of the mounting plate 3 is attached to one of the positioning elements 6 and the other end to another of the positioning elements 6. Accordingly, one end of the clamping plate 4 is slidably connected to one of the positioning elements 6 and the other end is slidably connected to the other of the positioning elements 6. The mounting plate 3 and the clamping plate 4 are arranged parallel to each other, and both the mounting plate 3 and the clamping plate 4 are designed to rest against the larger side of the battery. Because the clamping plate 4 is slidable, it can clamp the battery 8 in a second direction under an external force to exert a compressive force on the battery 8.

[0022] In the adjustment space formed by the two positioning elements 6, a battery receiving space is created between the clamping plate 4 and the mounting plate 3, as well as between the adjacent clamping plates 4, and the battery 8 can be placed in the battery receiving space. The two smaller sides of the battery 8 abut the positioning element 6 in the first direction, and the two larger sides of the battery abut the mounting plate 3 or the clamping plate 4 in the second direction, so that the battery 8 is enclosed and pressed within the battery receiving space.

[0023] Furthermore, the area of ​​one side where the terminal plate 4 rests against the battery 8 is greater than or equal to the area of ​​the side of the battery 8.

[0024] In this embodiment, the surface area of ​​the mounting plate 3 and the clamping plate 4 should correspond to the larger side of the battery. Furthermore, the surface area of ​​the side where the clamping plate 4 rests against the battery 8 is larger than or equal to the surface area of ​​the side of the battery 8 in order to cover the entire larger side of the battery, improve the pressure effect, and prevent local expansion of the uncompressed portion of the battery.

[0025] The elastic element 5 can be located between the mounting plate 3 and the battery 8, or between the clamping plate 4 and the battery 8, or both. Specifically, the elastic element 5 is located on at least one inner wall of the battery housing, and this inner wall faces a larger side of the battery. The elastic element 5 is made of an elastic material and can fill the gap between the clamping plate 4 and the battery 8, as well as the gap between the mounting plate 3 and the battery 8. It can also cushion the clamping action of the battery to prevent damage to the battery housing.The number of elastic elements 5 is not limited, and they can be provided on at least one inner wall of the battery receiving space or on both inner walls of the battery receiving space.

[0026] The ratio of the area of ​​the elastic element 5 to the clamping plate 4 lies in the range of 0.9–1. Since the elastic element 5 fits on the larger side of the battery, if its area is too small, it cannot effectively perform its function of resisting the pressure on that side. An elastic element 5 with an area ratio within the range described above is better suited to provide adequate resistance to the battery 8 and improve its limiting effect. For example, the ratio of the area of ​​the elastic element 5 to the clamping plate 4 can be 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, and so on.

[0027] Since the elastic element 5 is in direct contact with the battery housing, if the opening of the elastic element 5 is too large, it will absorb helium, leading to an inaccurate helium test. Conversely, if the opening of the elastic element 5 is too small, it will block the helium drain channel, preventing smooth helium drainage and also affecting the accuracy of the helium test. In this embodiment, the elastic element 5 is made of granular adhesive, and its opening should be neither too large nor too small. The specific size of the opening of the elastic element 5 can be adjusted as needed.

[0028] Furthermore, if the hardness of the elastic element 5 is too high, it is easy to damage the battery casing, while if the hardness of the elastic element 5 is too low, it will lose its damping effect on the battery 8, which is also easy to damage. Therefore, in this embodiment, the hardness of the elastic element 5 should not be too high or too low, and the specific hardness of the elastic element 5 can be adjusted as needed.

[0029] In this embodiment, the clamping plate 4 is provided with four.

[0030] Furthermore, the mounting plate 3 is provided in the middle of the base plate 1 and the clamping plate 4 is provided on both sides of the mounting plate 3, so that the batteries 8 can be placed and clamped on both sides of the mounting plate 3 to increase the number of batteries attached and improve detection efficiency.

[0031] In this embodiment, the mounting plate 3 is arranged in the center of the base plate 1, and two clamping plates 4 are provided on both sides of the mounting plate 3. On one side of the mounting plate 3, the mounting plate 3 forms a first battery receiving space with one clamping plate 4, and the clamping plate 4 forms a second battery receiving space with its adjacent clamping plate 4. Similarly, on the other side of the mounting plate 3, a third and a fourth battery receiving space are formed, so that the battery mounting device is able to secure four batteries simultaneously with high detection efficiency.

[0032] The base plate 1 is provided with a frame 2, the frame 2 forming a completely enclosed structure, and the underside of the frame 2 being attached to the base plate 1. Optionally, the base plate 1 and the frame 2 are formed as a single piece. The positioning element 6 is provided on the inner wall of the frame 2, i.e., the positioning element 6 is provided on the side facing the battery 8.

[0033] As in Fig. As shown in Figure 2, the positioning element 6 is located on the side of the frame 2 facing the battery 8, and the positioning element 6 rests against the battery 8 when the battery 8 is inserted into the battery compartment. The positioning element 6 is able to pre-position the battery 8, prevent it from slipping, and prepare it for subsequent clamping.

[0034] Optionally, the positioning element 6 can be made of an elastic material, such as rubber, which provides some leeway in the first direction to accommodate batteries 8 of different sizes. Furthermore, the positioning element 6 can provide a degree of cushioning for the battery 8 to prevent damage to the battery casing during the testing process.

[0035] Furthermore, a chamfer 9 is formed between an upper end surface of the positioning element 6 and a surface of the positioning element 6 facing the battery.

[0036] In this embodiment, the direction "upwards" refers to the direction indicated by arrow c in Fig. 2. The side of the positioning element 6 facing the battery rests against the battery 8, and a chamfer 9 is formed between the upper end face of the positioning element 6 and the side of the positioning element 6 facing the battery. In particular, the chamfer 9 is a chamfered corner, and when the battery 8 is inserted into the battery receiving compartment, the battery 8 will inevitably come into contact with the angled position between the upper end face of the positioning element 6 and the side of the positioning element 6 facing the battery. The angled position is formed as the chamfer 9 to prevent contact with the battery housing and to prevent scratching of the battery housing.

[0037] Furthermore, the second limiting assembly also comprises a clamping block (7), wherein a notch (401) is formed at an angular position between the upper end face of the clamping plate (4) and a side of the clamping plate (4) facing the positioning element (6), wherein the clamping block (7) is provided at the notch (401), wherein the sum of the length of the upper end face of the clamping plate (4) and the length of the upper end face of the clamping block (7) is greater than or equal to the length of a lower part of the clamping plate (4).

[0038] To facilitate access to the battery 8, in this embodiment the notch 401 is provided at a corner position between the upper end face of the terminal plate 4 and the side of the terminal plate 4 facing the positioning element 6, thus making it easier to reach and access the terminal plate and the battery with one hand or a tool. To improve the limiting clamping effect on the battery 8, a clamping block 7 is provided at the notch 401, which can be detachably connected to the terminal plate 4. In this embodiment, the clamping block 7 is detachably connected to the terminal plate 4 by screws. Once the clamping block 7 is installed in the notch 401, it can assist in clamping the battery 8, preventing local expansion of the unclamped part and improving the clamping effect.

[0039] The sum of the length of the upper end surface of the clamping plate 4 and the length of the upper end surface of the clamping block 7 is greater than or equal to the length of the lower part of the clamping plate 4, so that both the upper and the lower part of the battery 8 can be reliably clamped, thus improving the limiting effect on the battery.

[0040] Optionally, an elastic element 5 can also be provided between the terminal block 7 and the battery 8 to further protect the battery housing.

[0041] Furthermore, the fastening device for forming batteries comprises a guide assembly, wherein the guide assembly is provided in the frame 2 and the clamping plate 4, wherein the clamping plate 4 slides relative to the frame 2 by means of the guide assembly; or the guide assembly is provided in the base plate 1 and the clamping plate 4, wherein the clamping plate 4 slides relative to the base plate 1 by means of the guide assembly.

[0042] In this embodiment, the guide assembly comprises a slide rail and a slide groove, wherein the slide rail is provided on one of the frame 2 or the clamping plate 4 and the slide groove is provided on the other, the slide rail being able to be embedded in the slide groove and slide along the slide groove. In particular, at least one of the sides of the frame 2 facing the battery 8 is provided with a slide rail, one of the sides of the frame 2 facing the battery 8 may be provided with a slide rail, or both of the sides of the frame 2 facing the battery 8 are provided with slide rails, and a slide groove is provided on one end face of the clamping plate 4 facing the frame 2, and the slide rails cooperate with the slide grooves to enable the clamping plate 4 to slide relative to the frame 2.

[0043] Of course, in other embodiments, depending on the specific characteristics of the adjustment space, the guide assembly can also be provided on the base plate 1 and the clamping plate 4, and the clamping plate 4 slides relative to the base plate 1 over the guide assembly. The guide assembly comprises a slide rail and a slide groove, wherein the slide rail is provided on one of the base plate 1 or the clamping plate 4 and the slide groove is provided on the other, the slide rail being able to be embedded in the slide groove and slide along the slide groove. For example, the base plate 1 is provided with a slide groove and the underside of the clamping plate 4 with a slide rail, the slide rail interacting with the slide groove to displace the clamping plate 4 relative to the base plate 1.

[0044] Furthermore, the fastening device for forming batteries also includes a drive mechanism that moves the clamping plate (4) in a direction towards the mounting plate (3) in order to fasten the battery (8).

[0045] A drive end of the drive mechanism is connected to a side of the outermost terminal plate 4 facing away from the battery, and the drive mechanism is able to exert a pressure force on the terminal plate 4 to cause the terminal plate 4 to press against the battery 8, thereby improving the limiting pressure effect.

[0046] The drive mechanism can be a cylinder. The drive mechanism is capable of exerting a forced pressure on the clamping plate 4, thus enabling the drive mechanism to provide a forced pressure of 600 kgf.

[0047] One embodiment further provides a test device for testing the airtightness of a battery, wherein the test device includes the above-mentioned fastening device for forming batteries.

[0048] The overall structure of the testing device is in Fig. Figure 1 illustrates this. Specifically, the test apparatus comprises a box, a base plate 1 of the battery mounting device (which forms the bottom structure of the box), a frame 2 of the battery mounting device (which forms a side wall structure of the box), a second boundary assembly, and the battery 8, which are suitable for placement within the box. Naturally, the test apparatus for performing the battery airtightness test also includes other necessary test devices and structures, which are not described here.

[0049] The process of securing the batteries and testing for airtightness using the testing device of this embodiment is described below in conjunction with the accompanying drawings:

[0050] First, two batteries 8 to be tested are placed in a first battery compartment or a third battery compartment, and the clamping plate 4 is pushed close to the batteries 8 to be tested, and then two more batteries 8 to be tested are placed in a second battery compartment or a fourth battery compartment, and the outer clamping plate 4 is pushed close to the batteries 8 to be tested.

[0051] A drive mechanism is used to exert a pressure force (the forced pressure is 600 kgf) on the outermost clamping plate 4, and the clamping plate 4 exerts this pressure force on the battery housing, with a granular adhesive (elastic element 5) located between the battery 8 and the clamping plate 4, and also a granular adhesive located between the battery 8 and the mounting plate 3.

[0052] Afterwards, the box is closed and the airtightness test (helium test) is started. A vacuum pump is used to evacuate the box to -100 kPa, and the maximum alarm time is 30 seconds. This means that if the air pressure inside the box is still not evacuated to -100 kPa within 30 seconds, the surface of battery 8 under test has a large leak, and an alarm is triggered. If the air pressure in the box can be pumped down to -100 kPa within 30 seconds, the vacuum pump is switched off, the helium check valve is opened, and the gas in the box is pumped to the helium checker and sent to the mass spectrometer to determine the microleakage rate of the battery.

[0053] During the above airtightness test procedure, the clamping plate 4 always exerts a pressure force on the battery 8, and the positioning element 6 also always confines the battery, preventing gas expansion in the battery's inner electrical core and ensuring that the outer electrode foil does not fail to adhere properly. This prevents lithium embedding in the battery from hindering battery performance during subsequent charging and causing brown spots on the outer electrode foil. The test apparatus of this embodiment can effectively improve the battery's fixed capacity (70% SOC) after the gas tightness test, preventing brown spots, black spots, and lithium precipitation issues at the interface, and thus improving the electrical performance of the electrical core.

[0054] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, the person skilled in the art may make various changes and variations without departing from the spirit and scope of the present invention, and such changes and variations fall within the scope of the accompanying claims.

[0055] The present invention relates to the field of novel energy batteries and discloses a fastening device for forming batteries and a testing device that exert an external pressure force on the battery, reducing the expansion of the electrical core, preventing the gap between the outer electrode foils of the battery from increasing, and making the battery less susceptible to brown and black spots and accompanying lithium precipitation after the airtightness test. The device comprises a base plate 1, a first limiting assembly, a second limiting assembly, and an elastic element 5, wherein the first limiting assembly comprises two positioning elements, the two positioning elements being provided relative to each other on the base plate, with the battery bearing against the two positioning elements.wherein the second limiting assembly is provided on the base plate and is located between two of the positioning elements, wherein the second limiting assembly comprises a mounting plate and at least one clamping plate, wherein the mounting plate is fixed relative to the base plate, wherein the clamping plate is provided to slide relative to the base plate, wherein a battery receiving space is formed between the clamping plate and the mounting plate and between the adjacent clamping plates; wherein the elastic element 5 is provided between the mounting plate and the battery and / or between the clamping plate and the battery, wherein the area ratio between the elastic element and the clamping plate is in the range of 0.9-1.

Claims

[1] Mounting device for forming batteries, characterized by , that it is used for fastening a battery (8), the fastening device for forming batteries comprising the following: a base plate (1); a first boundary assembly comprising two positioning elements (6), wherein the two positioning elements (6) are provided relative to each other on the base plate (1), wherein the battery (8) rests against the two positioning elements (6); a second limiting assembly provided on the base plate (1) and located between two of the positioning elements (6), wherein the second limiting assembly comprises a mounting plate (3) and at least one clamping plate (4), wherein the mounting plate (3) is fixed relative to the base plate (1), wherein the clamping plate (4) is provided to slide relative to the base plate (1), and wherein a battery receiving space is formed between the clamping plate (4) and the mounting plate (3) and between the adjacent clamping plates (4); an elastic element (5) provided between the mounting plate (3) and the battery (8) and / or between the clamping plate (4) and the battery (8), wherein the area ratio between the elastic element (5) and the clamping plate (4) is in a range of 0.9-1. [2] Fastening device for forming batteries according to claim 1, characterized by, that the mounting plate (3) is provided in the middle of the base plate (1), with clamping plates (4) being provided on both sides of the mounting plate (3). [3] Fastening device for forming batteries according to claim 1, characterized by , that a chamfer (9) is formed between an upper end surface of the positioning element (6) and a side of the positioning element (6) facing the battery (8). [4] Fastening device for forming batteries according to claim 1, characterized by , that the area of ​​a side where the terminal plate (4) rests against the battery (8) is greater than or equal to the area of ​​the side of the battery (8). [5] Fastening device for forming batteries according to claim 1, characterized by , that the elastic element (5) consists of granular adhesive. [6] Fastening device for forming batteries according to claim 1, characterized by, that the second limiting assembly further comprises a clamping block (7) wherein a notch (401) is formed at an angular position between the upper end face of the clamping plate (4) and a side of the clamping plate (4) facing the positioning element (6), wherein the clamping block (7) is provided at the notch (401), wherein the sum of the length of the upper end face of the clamping plate (4) and the length of the upper end face of the clamping block (7) is greater than or equal to the length of a lower part of the clamping plate (4). [7] Fastening device for forming batteries according to claim 1, characterized bythat the base plate (1) is provided with a frame (2), wherein the positioning element (6) is provided on an inner wall of the frame (2), wherein the fastening device for forming batteries further comprises a guide assembly, wherein the guide assembly is provided between the frame (2) and the clamping plate (4), wherein the clamping plate (4) slides relative to the frame (2) by means of the guide assembly. [8] Fastening device for forming batteries according to claim 1, characterized by , that it further comprises a guide assembly, wherein the guide assembly is provided on the base plate (1) and the clamping plate (4), wherein the clamping plate (4) slides over the guide assembly relative to the base plate (1). [9] Fastening device for forming batteries according to any one of claims 1 to 8, characterized by, that it further comprises a drive mechanism which moves the clamping plate (4) in a direction towards the mounting plate (3) in order to secure the battery (8). [10] Testing device, characterized by , that it serves to test the airtightness of a battery, wherein the test device comprises a fastening device for forming batteries according to any one of claims 1 to 9.

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