Battery clamping fixtures and battery testing equipment

Abstract

This application relates to the field of battery technology and discloses a battery clamping fixture and battery testing equipment, including a fixture body, a first airbag, and a second airbag. The fixture body is provided with opposing first and second mounting surfaces. The first airbag is connected to the first mounting surface, and the second airbag is connected to the second mounting surface. When life testing of a pouch battery is required, the battery clamping fixture of this embodiment is used to clamp the pouch battery using the first and second airbags, and then the pouch battery is subjected to cyclic charging and discharging. Although the first and second surfaces of the pouch battery have poor flatness, both the first and second airbags can deform to ensure that the contact area between the first airbag and the first surface is large, and the contact area between the second airbag and the second surface is large, so that the pressure borne by the pouch battery is more uniform.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery clamping fixture and battery testing equipment. Background Technology

[0002] Among the various packaging forms of lithium-ion batteries, pouch batteries occupy an important market position due to their unique advantages. Compared with batteries packaged in traditional metal casings (such as steel or aluminum casings), pouch batteries use multi-layer composite aluminum-plastic film as the packaging material. When conducting life tests on pouch batteries, clamps are often used to tightly hold the battery on both sides, and then the lithium battery is cycled through charging and discharging. The clamps can simulate the clamping forces that the battery experiences in actual use. Conventional clamps often include two clamping plates, with the battery pressed between them. The clamping plates are made of rigid materials such as glass or metal.

[0003] However, due to the poor flatness of the large surface of the pouch battery, the pressure on the pouch battery is uneven when the clamping plates of the fixture tighten it, which can easily lead to local lithium plating in the pouch battery.

[0004] Therefore, how to solve or improve the problem of uneven pressure when pouch batteries are clamped by conventional fixtures in related technologies has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, this application provides a battery clamping fixture and a battery testing device to solve or improve the problem of uneven pressure when pouch batteries are clamped by conventional fixtures.

[0006] In a first aspect, this application provides a battery clamping fixture, comprising: The tooling body is provided with a first mounting surface and a second mounting surface that are opposite to each other; The first airbag is connected to the first mounting surface, and the side of the first airbag away from the first mounting surface is used to press against the first surface of the battery. The second airbag is connected to the second mounting surface, and the side of the second airbag away from the second mounting surface is used to press against the second surface of the battery, with the first surface and the second surface opposite to each other.

[0007] In one alternative implementation, it further includes: A first pressure sensor is used to detect the air pressure inside the first airbag; and / or a second pressure sensor, the second pressure sensor being used to detect the air pressure inside the second airbag.

[0008] In one alternative implementation, it further includes: A first air nozzle is disposed on the first airbag, and the first air nozzle is used to inflate or deflate the first airbag.

[0009] In one alternative implementation, it further includes: The second air nozzle is located on the second airbag and is used to inflate or deflate the second airbag.

[0010] In one alternative implementation, it further includes: The first air tube has one end connected to the first air nozzle and the other end used to connect to the inflation device; The second air tube has one end connected to the second air nozzle and the other end used to connect to the inflation device.

[0011] In one alternative implementation, it further includes: The first sealing ring is fitted around the outer periphery of the first air nozzle at one end of the first air tube, and the first sealing ring is squeezed between the inner wall of the first air tube and the outer wall of the first air nozzle. The second sealing ring is fitted around the outer periphery of the second air nozzle at one end of the second air tube, and the second sealing ring is pressed between the inner wall of the second air tube and the outer wall of the second air nozzle.

[0012] In one alternative implementation, the first trachea is connected to the second trachea.

[0013] In one optional embodiment, the tooling body includes a first plate, a second plate, and a connector, wherein the first plate and the second plate are connected by the connector, and the connector can restrict the first plate and the second plate from moving away from each other. The side of the first plate that is closer to the second plate is designated as the first mounting surface; The side of the second plate closest to the first plate is designated as the second mounting surface.

[0014] In one optional embodiment, at least two connectors are provided, with the connectors provided on both sides of the first airbag.

[0015] Secondly, this application also provides a battery testing device, including any of the battery clamping fixtures described above.

[0016] This application provides a battery clamping fixture. When life testing of a pouch battery is required, the first and second airbags of the fixture are used to clamp the pouch battery, and then the pouch battery is subjected to cyclic charging and discharging. Although the first and second surfaces of the pouch battery have poor flatness, both the first and second airbags can deform to ensure that the contact area between the first airbag and the first surface is large, and the contact area between the second airbag and the second surface is large. This ensures that the pressure on the pouch battery is more uniform, resulting in good contact of the pouch battery core, reducing the impedance of the lithium-ion battery during the testing process, and preventing uneven stress on the pouch battery from causing local lithium plating. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a battery clamping fixture according to an embodiment of this application; Figure 2 This is a schematic diagram of the fixture body structure of a battery clamping fixture according to an embodiment of this application; Figure 3 This is a schematic diagram of the connection of the first sealing ring of a battery clamping fixture according to an embodiment of this application; Figure 4 This is a schematic diagram of the connection of the second sealing ring of a battery clamping fixture according to an embodiment of this application; Explanation of reference numerals in the attached figures: 1. Tooling body; 101. First plate; 1011. First mounting surface; 102. Second plate; 1021. Second mounting surface; 103. Connector; 2. First airbag; 3. Second airbag; 4. First air nozzle; 5. Second air nozzle; 6. First air pipe; 7. Second air pipe; 8. First sealing ring; 9. Second sealing ring; 10. Inflation device. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] The following is combined with Figures 1 to 4 This describes an embodiment of the present application.

[0021] According to embodiments of this application, in one aspect, a battery clamping fixture is provided, such as... Figure 1 As shown, the fixture includes a tooling body 1, a first airbag 2, and a second airbag 3. The tooling body 1 has a first mounting surface 1011 and a second mounting surface 1021 facing each other. The first airbag 2 is connected to the first mounting surface 1011, and the second airbag 3 is connected to the second mounting surface 1021. The first mounting surface 1011 on the tooling body 1 restricts the movement of the first airbag 2 away from the second airbag 3. The second mounting surface 1021 on the tooling body 1 restricts the movement of the second airbag 3 away from the first airbag 2. The side of the first airbag 2 away from the first mounting surface 1011 is positioned opposite the side of the second airbag 3 away from the second mounting surface 1021.

[0022] Thus, the first airbag 2 and the second airbag 3 are used to place the battery. After the battery is placed between the first airbag 2 and the second airbag 3, the side of the first airbag 2 away from the first mounting surface 1011 presses against the first surface of the battery, and the side of the second airbag 3 away from the second mounting surface 1021 presses against the second surface of the battery, wherein the first surface and the second surface of the battery are opposite to each other, thereby clamping the battery between the first airbag 2 and the second airbag 3.

[0023] When life testing of pouch batteries is required, the battery clamping fixture of this embodiment is used to clamp the pouch battery with the first airbag 2 and the second airbag 3, and then the pouch battery is cyclically charged and discharged.

[0024] Because the first airbag 2 and the second airbag 3 are flexible, although the flatness of the first and second surfaces of the pouch battery is poor, both the first airbag 2 and the second airbag 3 can deform to ensure that the first airbag 2 has a large contact area with the first surface and the second airbag 3 has a large contact area with the second surface. This makes the pressure on the pouch battery more uniform, ensures good contact of the pouch battery core, reduces the impedance of the lithium-ion battery during the test process, and avoids uneven stress on the pouch battery leading to local lithium plating.

[0025] Moreover, even if the pouch battery expands during use, the first airbag 2 and the second airbag 3 can deform in real time to ensure that the first airbag 2 has a large contact area with the first surface and the second airbag 3 has a large contact area with the second surface, so that the pressure on the pouch battery is always relatively uniform.

[0026] In one embodiment, the battery clamping fixture further includes a first pressure sensor. The first pressure sensor is used to detect the air pressure inside the first airbag 2. When clamping the pouch battery using the first airbag 2 and the second airbag 3, the clamping force on the pouch battery can be determined by detecting the change in air pressure inside the first airbag 2. This avoids excessive clamping force on the pouch battery, which could damage it.

[0027] Moreover, it can also prevent the deformation of the first airbag 2 and the second airbag 3 from being too large, so that the first airbag 2 and the second airbag 3 can continue to deform by a small amount. This may result in the first airbag 2 and the second airbag 3 not being able to deform sufficiently when the soft-pack battery expands during use, which will reduce the contact area between the first airbag 2 and the first surface and the second airbag 3 and the second surface, thus causing uneven pressure on the soft-pack battery.

[0028] The first pressure sensor can be located inside the first airbag 2.

[0029] In one embodiment, the battery clamping fixture further includes a second pressure sensor. The second pressure sensor is used to detect the air pressure inside the second airbag 3. When using the first airbag 2 and the second airbag 3 to clamp the pouch battery, the clamping force on the pouch battery can be determined by detecting the change in air pressure inside the second airbag 3, thus avoiding excessive clamping force on the pouch battery.

[0030] The second pressure sensor can be installed inside the second airbag 3.

[0031] In one embodiment, the battery clamping fixture further includes a first pressure sensor and a second pressure sensor. The first pressure sensor detects the air pressure inside the first airbag 2, and the second pressure sensor detects the air pressure inside the second airbag 3. When using the first airbag 2 and the second airbag 3 to clamp the pouch battery, the clamping force on the pouch battery can be determined by detecting either the change in air pressure inside the first airbag 2 or the change in air pressure inside the second airbag 3. Dual detection ensures accuracy and prevents the clamping force on the pouch battery from being incorrectly controlled if either the first or second pressure sensor fails.

[0032] It is worth noting that during the life test of the pouch battery, the pouch battery was subjected to cyclic charge and discharge. During this process, the pouch battery expands. When the pouch battery expands, the first airbag 2 and the second airbag 3 are compressed. Therefore, by detecting the pressure change in the first airbag 2 and / or the pressure change in the second airbag 3, the change in expansion force of the pouch battery during charge and discharge can be monitored in real time.

[0033] In one embodiment, such as Figure 1 and Figure 2As shown, the battery clamping fixture also includes a first air nozzle 4. The first air nozzle 4 is disposed on the first airbag 2, so that the first airbag 2 can be inflated or deflated through the first air nozzle 4.

[0034] Specifically, the first air nozzle 4 can be connected to an air pump, and the air pump can be used to inflate or deflate the first airbag 2 through the first air nozzle 4.

[0035] Thus, when using the first airbag 2 and the second airbag 3 to clamp the pouch battery, the first airbag 2 can be deflated first through the first air nozzle 4, increasing the distance between the first airbag 2 and the second airbag 3. Then, the pouch battery is placed between the first airbag 2 and the second airbag 3, with the first surface of the pouch battery facing the side of the first airbag 2 away from the first mounting surface 1011, and the second surface of the pouch battery facing the side of the second airbag 3 away from the second mounting surface 1021. At this point, the first airbag 2 is inflated through the first air nozzle 4, causing it to expand and clamp the battery between the first airbag 2 and the second airbag 3, making the installation of the pouch battery more convenient.

[0036] Furthermore, to meet the testing requirements of different batteries, the first air bladder 2 can be inflated or deflated via the first air nozzle 4 to change the clamping force on the pouch battery.

[0037] For example, as the number of charge-discharge cycles of the pouch battery increases, the expansion range of the pouch battery may decrease. In this case, the first airbag 2 can be inflated to ensure sufficient clamping force when the pouch battery expands, thereby meeting the testing requirements.

[0038] In one embodiment, such as Figure 1 and Figure 2 As shown, the battery clamping fixture also includes a second air nozzle 5, which is disposed on the second airbag 3, thereby allowing the second airbag 3 to be inflated or deflated through the second air nozzle 5. Specifically, the second air nozzle 5 can be connected to an air pump, and the air pump can be used to inflate or deflate the second airbag 3 through the second air nozzle 5.

[0039] In this way, when using the first airbag 2 and the second airbag 3 to clamp the pouch battery, air can be released from the first airbag 2 through the first air nozzle 4 and from the second airbag 3 through the second air nozzle 5, increasing the distance between the first airbag 2 and the second airbag 3. Then, the pouch battery is placed between the first airbag 2 and the second airbag 3, with the first surface of the pouch battery facing the side of the first airbag 2 away from the first mounting surface 1011, and the second surface of the pouch battery facing the side of the second airbag 3 away from the second mounting surface 1021. At this time, inflating the first airbag 2 through the first air nozzle 4 and deflating the second airbag 3 through the second air nozzle 5 causes the first airbag 2 and the second airbag 3 to expand, clamping the battery between them, making the installation of the pouch battery more convenient.

[0040] Since the distance between the first airbag 2 and the second airbag 3 can be increased by deflating the first airbag 2 and the second airbag 3 respectively, the distance between the first airbag 2 and the second airbag 3 can vary over a wider range, making it applicable to a wider range of pouch battery thicknesses.

[0041] Furthermore, to meet the testing requirements of different batteries, the clamping force on the pouch battery can be changed by inflating and deflating the first airbag 2 through the first air nozzle 4, thus providing a wider range of control. Moreover, for the same clamping force variation requirement, it can be achieved by separately changing the deformation of the first airbag 2 and the second airbag 3, avoiding excessive deformation of either the first airbag 2 or the second airbag 3 that could affect the service life.

[0042] In some embodiments, when the first airbag 2 is inflated or deflated through the first air nozzle 4, the pressure inside the first airbag 2 can be detected in real time using a first pressure sensor. When the second airbag 3 is inflated or deflated through the second air nozzle 5, the pressure inside the second airbag 3 can be detected in real time using a second pressure sensor.

[0043] In one embodiment, such as Figure 1 As shown, the battery clamping fixture also includes a first air pipe 6 and a second air pipe 7.

[0044] One end of the first air tube 6 is connected to the first air nozzle 4, and the second end of the first air tube 6 is connected to the inflation device 10, so that the first airbag 2 can be inflated and deflated by the inflation device 10 through the first air tube 6 and the first air nozzle 4, making it more convenient to connect the inflation device 10.

[0045] One end of the second air tube 7 is connected to the second air nozzle 5, and the second end of the second air tube 7 is connected to the inflation device 10, so that the second airbag 3 can be inflated and deflated by the inflation device 10 through the second air tube 7 and the second air nozzle 5, making it more convenient to connect the inflation device 10.

[0046] The inflation device 10 can be an air pump.

[0047] In one embodiment, such as Figure 3 and Figure 4 As shown, the battery clamping fixture also includes a first sealing ring 8 and a second sealing ring 9.

[0048] like Figure 3 As shown, one end of the first air tube 6 is sleeved on the outer periphery of the first air nozzle 4, and the first sealing ring 8 is squeezed between the inner wall of the first air tube 6 and the outer wall of the first air nozzle 4, so that the first sealing ring 8 plays a sealing role between the inner wall of the first air tube 6 and the outer wall of the first air nozzle 4 to prevent air leakage.

[0049] like Figure 4As shown, one end of the second air tube 7 is sleeved on the outer periphery of the second air nozzle 5, and the second sealing ring 9 is squeezed between the inner wall of the second air tube 7 and the outer wall of the second air nozzle 5, so that the second sealing ring 9 plays a sealing role between the inner wall of the second air tube 7 and the outer wall of the second air nozzle 5 to prevent air leakage.

[0050] In one embodiment, such as Figure 1 As shown, the first air tube 6 is connected to the second air tube 7. This arrangement allows for simultaneous inflation of both air tubes, enabling simultaneous inflation and deflation of the first airbag 2 and the second airbag 3. This ensures that the deformation of the first airbag 2 and the second airbag 3 is consistent, preventing excessive deformation of either airbag 2 or the second airbag 3.

[0051] Specifically, the end of the first air tube 6 away from the first air nozzle 4 and the end of the second air tube 7 away from the second air nozzle 5 can be connected to the same connecting tube or connector, and the connecting tube or connector can be connected to the inflation device 10.

[0052] In one embodiment, such as Figure 1 and Figure 2 As shown, the tooling body 1 includes a first plate 101, a second plate 102, and a connector 103. The first plate 101 and the second plate 102 are connected by the connector 103, which restricts the first plate 101 and the second plate 102 from moving away from each other. The side of the first plate 101 closest to the second plate 102 is designated as a first mounting surface 1011, and the first airbag 2 is connected to this side. The side of the second plate 102 closest to the first plate 101 is designated as a second mounting surface 1021, and the second airbag 3 is connected to this side.

[0053] When using the first airbag 2 and the second airbag 3 to clamp the soft-pack battery, the battery can be placed between the first airbag 2 and the second airbag 3 firstly, and then the first plate 101 and the second plate 102 can be connected using the connector 103, so that the first airbag 2 and the second airbag 3 can press the soft-pack battery tightly, making installation more convenient.

[0054] Specifically, the connector 103 can be a bolt, with mounting holes correspondingly provided on the first plate 101 and the second plate 102. The bolt is sequentially passed through the mounting holes on the first plate 101 and the second plate 102. Nuts are fitted onto the bolts to tighten and fix the first plate 101 and the second plate 102.

[0055] When clamping the battery, the nut can be loosened to increase the distance between the first airbag 2 and the second airbag 3. Then, the battery can be placed between the first airbag 2 and the second airbag 3, and the nut can be tightened to shorten the distance between the first airbag 2 and the second airbag 3, thereby clamping the battery.

[0056] This allows for the adjustment of the nut to accommodate pouch batteries of different thicknesses, thus broadening its applicability. The nut can also be used to adjust the clamping force on the pouch battery.

[0057] In some embodiments, a first perforation may be provided on the first plate 101, and a first air nozzle 4 passes through the first perforation and is connected to the first airbag 2. A second perforation may be provided on the second plate 102, and a second air nozzle 5 passes through the second perforation and is connected to the second airbag 3.

[0058] In one embodiment, such as Figure 1 and Figure 2 As shown, at least two connectors 103 are provided, with the two connectors 103 located on both sides of the first airbag 2. Thus, the two connectors 103 connect the first plate 101 and the second plate 102 on both sides of the first airbag 2, making the overall structure more stable.

[0059] According to an embodiment of this application, another aspect provides a battery testing device, including any of the battery clamping fixtures mentioned above. The technical effects of this battery testing device are the same as those of the battery clamping fixture, so they will not be described in detail here.

[0060] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by this application.

Claims

1. A battery clamping tool, characterized by, include: The tooling body (1) is provided with a first mounting surface (1011) and a second mounting surface (1021) opposite to each other. The first airbag (2) is connected to the first mounting surface (1011), and the side of the first airbag (2) away from the first mounting surface (1011) is used to press against the first surface of the battery; The second airbag (3) is connected to the second mounting surface (1021). The side of the second airbag (3) away from the second mounting surface (1021) is used to press against the second surface of the battery. The first surface and the second surface are opposite to each other.

2. The battery clamping tool of claim 1, wherein, Also includes: A first pressure sensor is used to detect the air pressure inside the first airbag (2); and / or a second pressure sensor, the second pressure sensor being used to detect the air pressure inside the second airbag (3).

3. The battery clamping fixture according to claim 1, characterized in that, Also includes: The first air nozzle (4) is disposed on the first airbag (2) and is used to inflate or deflate the first airbag (2).

4. The battery clamping fixture according to claim 3, characterized in that, Also includes: The second air nozzle (5) is disposed on the second airbag (3) and is used to inflate or deflate the second airbag (3).

5. The battery clamping tool of claim 4, wherein, Also includes: The first air tube (6) is connected at one end to the first air nozzle (4) and at the other end to the inflation device (10); The second air tube (7) is connected at one end to the second air nozzle (5) and at the other end to the inflation device (10).

6. The battery clamping fixture according to claim 5, characterized in that, Also includes: The first sealing ring (8) is fitted around the outer periphery of the first air tube (6) at one end, and the first sealing ring (8) is squeezed between the inner wall of the first air tube (6) and the outer wall of the first air tube (4). The second sealing ring (9) is fitted around the outer periphery of the second air tube (7) at one end, and the second sealing ring (9) is squeezed between the inner wall of the second air tube (7) and the outer wall of the second air tube (5).

7. The battery clamping fixture according to claim 5, characterized in that, The first trachea (6) is connected to the second trachea (7).

8. The battery clamping fixture according to any one of claims 1-7, characterized in that, The tooling body (1) includes a first plate (101), a second plate (102), and a connector (103). The first plate (101) and the second plate (102) are connected by the connector (103), and the connector (103) can restrict the first plate (101) and the second plate (102) from moving away from each other. The side of the first plate (101) that is close to the second plate (102) is set as the first mounting surface (1011). The side of the second plate (102) closest to the first plate (101) is designated as the second mounting surface (1021).

9. The battery clamping fixture according to claim 8, characterized in that, At least two connectors (103) are provided, and the connectors (103) are provided on both sides of the first airbag (2).

10. A battery testing device, characterized in that, Includes the battery clamping fixture as described in any one of claims 1-9.

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