Battery testing tool

Abstract

The utility model provides a battery test tool, which is used for a gas production test of a battery body and comprises a gas bag and a clamping assembly, the air bag is provided with a main body part arranged outside the battery body in a sleeving manner and an air collecting part communicated with the main body part, and a tab of the battery main body extends out of the main body part; the clamping assembly comprises a first clamping plate and a second clamping plate which are arranged on the two sides of the main body part in the thickness direction respectively, and the first clamping plate and the second clamping plate are used for clamping the main body part and the battery body, so that gas generated by the battery body flows into the gas collection part from the main body part. According to the battery test tool provided by the utility model, the first clamping plate and the second clamping plate are arranged, so that the main body part is in close contact with the battery body, the main body part is prevented from expanding due to gas generated by the battery body, and the gas generated by the battery body enters the gas collection part from the main body part; and the precision of the gas production test of the battery body is improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery technology, and in particular to a battery testing fixture. Background Technology

[0002] Currently, lithium-ion and sodium-ion batteries are widely used in power and energy storage applications due to their relatively mature technology. Lithium-ion and sodium-ion batteries can be classified according to their packaging method (cylindrical, prismatic, and pouch cells) and also according to their cathode material (ternary, lithium iron phosphate, layered oxide, and polyanion systems).

[0003] In ternary and layered oxide batteries, oxygen release from the cathode material during high-temperature or high-rate charging causes the battery casing to swell. During system evaluation, considering factors such as manufacturing costs and flexible design, researchers often use small, soft-pack packaging and need to collect the amount of gas produced by the battery during testing.

[0004] To obtain the gas production rate of the battery, the gas inside the pouch is usually extracted after testing, and the gas volume is measured directly. Alternatively, the expansion volume of the pouch can be measured during testing, and the gas production rate can be calculated from the volume change. However, due to unreasonable tooling design, the testing accuracy is low. Utility Model Content

[0005] In view of this, the present invention aims to provide a battery testing fixture to facilitate the testing of the gas production of the battery body and to improve the testing accuracy.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0007] A battery testing fixture for testing gas generation in a battery body, the battery testing fixture comprising an air bag and a clamping assembly;

[0008] The air bag has a main body portion that is sleeved on the battery body, and an air collection portion that is connected to the main body portion. The electrode tabs on the battery body extend out of the main body portion.

[0009] The clamping assembly includes a first clamping plate and a second clamping plate disposed on both sides of the thickness direction of the main body portion. The first clamping plate and the second clamping plate are used to clamp the main body portion and the battery body, so that the gas generated by the battery body flows from the main body portion into the gas collection portion.

[0010] Furthermore, the distance between the first clamping plate and the second clamping plate is adjustable.

[0011] Furthermore, the second clamping plate is slidably disposed on the first clamping plate, and an elastic portion is provided between the first clamping plate and the second clamping plate, the elastic portion being used to apply a force toward the first clamping plate to the second clamping plate.

[0012] Furthermore, the clamping assembly also includes a fixing plate that is spaced apart from and connected to the first clamping plate, and the second clamping plate is slidably disposed between the fixing plate and the first clamping plate;

[0013] The elastic portion is disposed between the fixed plate and the second clamping plate.

[0014] Furthermore, the fixing plate and the first clamping plate bracket are connected by multiple connecting columns, and the second clamping plate is slidably disposed on the multiple connecting columns.

[0015] Furthermore, the elastic portion includes a plurality of springs disposed between the fixed plate and the second clamping plate.

[0016] Furthermore, the fixing plate and / or the first clamping plate are provided with a hand-held portion.

[0017] Furthermore, a separating portion for separating the gas collecting portion and the main body portion are provided between the two, and a connecting portion for connecting the two.

[0018] Both the dividing portion and the connecting portion extend along the length direction of the main body portion.

[0019] Furthermore, the air bag is made of aluminum-plastic film.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] The battery testing fixture of this utility model, by setting a first clamping plate and a second clamping plate, makes the main body of the gas bag in close contact with the battery body, which helps to prevent the main body from expanding due to the gas generated by the battery body, and ensures that the gas generated by the battery body enters the gas collection part through the main body, which can improve the gas collection efficiency and accuracy of the gas collection part, thereby improving the accuracy of the gas generation test of the battery body.

[0022] Furthermore, the distance between the first and second clamping plates is adjustable. When dealing with battery bodies of different thicknesses, the operator can adjust the distance between the first and second clamping plates, facilitating gas generation tests on battery bodies of different thicknesses and thus providing better testing flexibility. By incorporating an elastic section, the second clamping plate can be moved towards the first clamping plate, causing the two clamping plates to gradually approach and clamp the battery body. The force of the elastic section can automatically adjust according to the thickness of the battery body, ensuring a tight fit between the main body and the battery. Moreover, the elastic section eliminates the need for manual, precise adjustment of the distance between the two clamping plates, as it automatically adapts to the thickness of the battery body, greatly improving operational convenience.

[0023] In addition, the fixing plate serves to support and limit the sliding range of the second clamping plate, and also facilitates the arrangement of the elastic part and the application of force by the elastic part to the second clamping plate, thereby ensuring that the main body can fit tightly against the surface of the battery body. Multiple connecting posts not only facilitate the connection between the fixing plate and the first clamping plate, but also provide guidance for the sliding of the second clamping plate, making the sliding of the second clamping plate more stable and accurate, and helping to ensure that the clamping force is evenly distributed on the battery body.

[0024] Furthermore, the multiple springs in the elastic section allow for a more even distribution of elastic force on the second clamping plate. The handheld grip facilitates gas detection of the gas collection section. The separation and connecting sections extend along the length of the main body, improving the accuracy of gas discharge tests during the gas collection section. The gas bag is made of aluminum-plastic film, effectively preventing gas leakage and the ingress of external gases, ensuring the accuracy of the collected gas generation data from the battery itself. Attached Figure Description

[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0026] Figure 1 This is a schematic diagram of the battery testing fixture described in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure of the airbag described in an embodiment of the present invention from one perspective;

[0028] Figure 3 This is a structural schematic diagram of the air bag described in an embodiment of the present invention from another perspective;

[0029] Figure 4 This is a schematic diagram of the battery testing fixture described in this embodiment of the present invention during use.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Air bag; 2. First clamping plate; 3. Second clamping plate; 4. Spring; 5. Fixing plate;

[0032] 100, positive output; 200, negative output;

[0033] 101. Main body; 102. Gas collection section; 103. Dividing section; 104. Connecting section;

[0034] 201. Connecting column;

[0035] 501. Handheld part. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0037] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "back" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] This embodiment relates to a battery testing fixture for testing the gas generation of a battery body, in order to solve the problems of poor gas collection effect and low testing accuracy in existing battery gas generation testing fixtures.

[0040] In terms of overall structure, the battery testing fixture described in this embodiment includes an air bag 1 and a clamping assembly. The air bag 1 has a main body portion 101 fitted over the battery body, and a gas collecting portion 102 communicating with the main body portion 101. The electrode tabs on the battery body extend out of the main body portion 101. The clamping assembly includes a first clamping plate 2 and a second clamping plate 3 respectively disposed on both sides of the main body portion 101 in the thickness direction. The first clamping plate 2 and the second clamping plate 3 are used to clamp the main body portion 101 and the battery body, allowing gas generated by the battery body to flow from the main body portion 101 into the gas collecting portion 102.

[0041] The battery testing fixture described in this embodiment, by setting a first clamping plate 2 and a second clamping plate 3, ensures that the main body 101 of the gas bag 1 is in close contact with the battery body. This helps prevent the main body 101 from expanding due to the gas generated by the battery body, and ensures that all the gas generated by the battery body enters the gas collection section 102 through the main body 101. This improves the gas collection efficiency and accuracy of the gas collection section 102, thereby improving the accuracy of the gas generation test of the battery body.

[0042] Based on the above overview, an exemplary structure of the battery testing fixture described in this embodiment is as follows: Figure 1 As shown in the diagram. The structure of airbag 1 will be explained below, as follows: Figure 2 and Figure 3 As shown, the main body 101 is conformally arranged to the battery body to facilitate the uniform flow of gas into the gas collecting section 102, thereby improving the gas collecting accuracy of the gas collecting section 102. In specific implementations, both the battery body and the main body 101 can be rectangular parallelepiped, or other geometric shapes can be adopted according to usage requirements.

[0043] As a preferred implementation method, such as Figure 3 As shown, a partition 103 is provided between the gas collecting section 102 and the main body section 101 to separate the two, and a connecting section 104 is provided to connect the two. Both the partition 103 and the connecting section 104 extend along the length direction of the main body section 101. This arrangement helps to improve the accuracy of the gas collecting section 102 when performing exhaust tests.

[0044] As one feasible implementation, the sheet structure is folded in half to form two parts. The free edges of the two parts are sealed to form bag-like structures, and the dividing part 103 is also sealed at corresponding positions of the two parts, thus creating an air bag 1. The positive output terminal 100 and the negative output terminal 200 of the battery body both extend out of the air bag 1 to facilitate power-on testing of the battery body.

[0045] In addition, the gas bag 1 is made of aluminum-plastic film. This effectively prevents gas leakage and the ingress of external gases, ensuring the accuracy of the collected gas generation data from the battery itself. During the battery gas generation test, when the battery generates gas, the gas bag 1 needs to collect the gas. The excellent gas barrier properties of the aluminum-plastic film allow the gas to be effectively confined inside the gas collection section 102, preventing it from easily diffusing to the outside through the wall of the gas bag 1. At the same time, the flexibility of the aluminum-plastic film allows the gas collection section 102 to expand appropriately as the gas increases, without rupturing due to gas accumulation, ensuring the integrity of gas collection.

[0046] In specific operations, such as Figure 4As shown, after the gas collecting section 102 completes the gas collection, it needs to be immersed in the liquid in the container. First, the volume V1 of the liquid in the container before the gas collecting section 102 is placed is obtained. After the gas collecting section 102 is immersed in the liquid, the liquid will drain from the container, and the volume V2 of the liquid in the container is then obtained. The volume difference between V1 and V2 is equal to the volume of gas in the gas collecting section 102. This arrangement ensures that both the separating section 103 and the connecting section 104 extend along the length of the main body 101, preventing the main body 101 and the two clamping plates from contacting the liquid, thereby further improving the accuracy of the gas production test of the battery body.

[0047] In a preferred embodiment, the distance between the first clamping plate 2 and the second clamping plate 3 is adjustable. When dealing with battery bodies of different thicknesses, the operator can adjust the distance between the first clamping plate 2 and the second clamping plate 3, which facilitates gas generation testing of battery bodies of different thicknesses, thus providing better testing flexibility.

[0048] In some embodiments, the second clamping plate 3 is slidably disposed on the first clamping plate 2, and an elastic portion is provided between the first clamping plate 2 and the second clamping plate 3. The elastic portion is used to apply a force toward the first clamping plate 2 to the second clamping plate 3. Here, by providing the elastic portion, the second clamping plate 3 can be pushed toward the first clamping plate 2, thereby causing the two clamping plates to gradually approach and clamp the battery body. The force of the elastic portion can be automatically adjusted according to the thickness of the battery body, ensuring that the main body 101 is tightly attached to the battery body. Moreover, by providing the elastic portion, there is no need to manually and precisely adjust the distance between the two clamping plates. The elastic portion can automatically adapt to the thickness of the battery body, greatly improving the convenience of operation.

[0049] In terms of specific structure, such as Figure 1 As shown, the clamping assembly also includes a fixing plate 5 spaced apart from and connected to the first clamping plate 2. The second clamping plate 3 is slidably disposed between the fixing plate 5 and the first clamping plate 2, and an elastic portion is disposed between the fixing plate 5 and the second clamping plate 3. Here, the fixing plate 5 serves to support and limit the sliding range of the second clamping plate 3, and also facilitates the arrangement of the elastic portion and the application of force by the elastic portion to the second clamping plate 3, thereby ensuring that the main body 101 can be tightly attached to the surface of the battery body.

[0050] like Figure 1 As shown in the diagram, in this embodiment, the fixing plate 5 and the first clamping plate 2 are connected by multiple connecting posts 201, and the second clamping plate 3 is slidably disposed on the multiple connecting posts 201. The multiple connecting posts 201 not only facilitate the connection between the fixing plate 5 and the first clamping plate 2, but also provide guidance for the sliding of the second clamping plate 3, making the sliding of the second clamping plate 3 more stable and accurate, and helping to ensure that the clamping force is evenly distributed on the battery body.

[0051] Multiple connecting posts 201 are arranged circumferentially along the fixing plate 5. For example, two connecting posts 201 are arranged at intervals corresponding to the ends of each fixing plate 5. The second clamping plate 3 is provided with connecting holes that correspond one-to-one with the connecting posts 201. The second clamping plate 3 is sleeved on the corresponding connecting post 201 through the connecting holes, so that it can slide along the connecting post 201 to move closer to or away from the first clamping plate 2, thereby adjusting the distance between the first clamping plate 2 and the second clamping plate 3.

[0052] like Figure 1 As shown, the elastic part in this embodiment includes multiple springs 4 disposed between the fixed plate 5 and the second clamping plate 3. The multiple springs 4 in the elastic part allow the elastic force to be distributed more evenly on the second clamping plate 3. Each connecting post 201 is fitted with a spring 4, which also helps to guide the springs 4, preventing them from tilting and ensuring their effectiveness. Furthermore, springs 4 can also be disposed between the middle of the second clamping plate 3 and the fixed plate 5. The cooperation of multiple springs 4 at the ends and in the middle further improves the stability of the force exerted by the elastic part on the second clamping plate 3, as well as the squeezing effect of the second clamping plate 3 on the main body 101.

[0053] In addition, such as Figure 1 and Figure 4 As shown in the illustration, in this embodiment, the fixing plate 5 and / or the first clamping plate 2 are provided with a handheld portion 501. The handheld portion 501 facilitates gas detection of the gas collection section 102 by holding the clamping assembly, not only eliminating the need to disassemble the clamping assembly and further improving testing accuracy, but also providing good operational convenience. In specific implementations, the handheld portion 501 can be a hand ring or handle, or other structures that facilitate handheld operation. The handheld portion 501 can be located on the side of the fixing plate 5 away from the second clamping plate 3, or it can be located on the side of the first clamping plate 2 in the width direction, etc.

[0054] In other embodiments, the first clamping plate 2 and the second clamping plate 3 in this embodiment are connected by multiple threaded pairs. The bolt pair includes bolts passing through the first clamping plate 2 and the second clamping plate 3, and nuts screwed onto the bolts. As the bolts and nuts are tightened, the main body 101 and the battery body are clamped between the first clamping plate 2 and the second clamping plate 3. The tightening position of the cover nut allows the first clamping plate 2 and the second clamping plate 3 to clamp battery bodies of different thicknesses. This bolt pair has a simple structure, is easy to operate, and offers good flexibility in use.

[0055] The battery testing fixture described in this embodiment, through the cooperation of the gas bag 1 and the first clamping plate 2 and the second clamping plate 3 in the clamping assembly, facilitates the collection of gas by the gas collection section 102. Furthermore, when measuring the gas collection section 102 using the liquid discharge measurement volume method, the clamping assembly does not need to be disassembled, thereby further improving testing accuracy. In addition, this battery testing fixture has a simple structure, is easy to operate, and has good flexibility in use.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1.A battery testing tool for gas generation testing of a battery body, the battery testing tool comprising: a gas bag and a clamping assembly, wherein the gas bag has a main body portion configured to be fitted over the battery body, and a gas collecting portion configured to be in communication with the main body portion, and wherein a tab of the battery body is configured to protrude through the main body portion, and wherein the clamping assembly comprises a first clamping plate and a second clamping plate configured to be fitted on opposite sides of the main body portion, and wherein the first clamping plate and the second clamping plate are configured to clamp the main body portion and the battery body such that gas generated by the battery body flows from the main body portion to the gas collecting portion. 2.The battery testing tool of claim 1, wherein a distance between the first clamping plate and the second clamping plate is adjustable. 3.The battery testing tool of claim 2, wherein the second clamping plate is configured to be slidably fitted on the first clamping plate, and wherein an elastic portion is configured to be fitted between the first clamping plate and the second clamping plate, and wherein the elastic portion is configured to apply a force to the second clamping plate towards the first clamping plate. 4.The battery testing tool of claim 3, wherein the clamping assembly further comprises a fixed plate configured to be fitted apart from the first clamping plate and connected to the first clamping plate, and wherein the second clamping plate is configured to be slidably fitted between the fixed plate and the first clamping plate, and wherein the elastic portion is configured to be fitted between the fixed plate and the second clamping plate. 5.The battery testing tool of claim 4, wherein the fixed plate and the first clamping plate are connected by a plurality of connecting columns, and wherein the second clamping plate is configured to be slidably fitted on the plurality of connecting columns. 6.The battery testing tool of claim 4, wherein the elastic portion comprises a plurality of springs fitted between the fixed plate and the second clamping plate. 7.The battery testing tool of claim 4, wherein the fixed plate and / or the first clamping plate is / are configured to have a hand holding portion. 8.The battery testing tool of claim 1, wherein a separation portion configured to separate the gas collecting portion and the main body portion is configured to be fitted between the gas collecting portion and the main body portion, and wherein a communication portion configured to be in communication with the gas collecting portion and the main body portion is configured to be fitted between the gas collecting portion and the main body portion, and wherein the separation portion and the communication portion are configured to extend along a length direction of the main body portion. 9.The battery testing tool of any one of claims 1 to 8, wherein the gas bag is made of an aluminum plastic film. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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