Battery cell shell voltage testing device
By introducing the pressurization process of pressurizing components into the lithium-ion battery cell shell voltage testing device, the problem of difficulty in identifying micro-short connections and micro-overlapping connections between the pole ears and the shell is solved, and the shell voltage abnormality and the risk of corrosion of aluminum shells is realized in advance, which improves battery quality and reduces production costs.
Patent Information
- Application Number
- CN202421810882.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-30
AI Technical Summary
In the process of producing lithium-ion battery cells, it is difficult to identify micro-short connections and micro-overlapping connections between the electrode and the shell when the envelope section monitors the voltage of the positive and negative electrode shell, resulting in delayed exposure of potential risks during subsequent assembly or charging and discharging of the battery, affecting battery quality and increasing production costs.
A battery cell shell voltage testing device is designed, and the pressure-pressure component is used to add a pressurization process in the envelope section. By testing the positive and negative electrode shell voltage, the micro-short connections between the electrode ear and the shell are identified in advance, thereby exposing the abnormal shell voltage and the risks of corrosion of the aluminum shell in advance.
Through the pressurization process, the micro-short connection and the micro-overlap connection between the pole ear and the shell can be identified in advance, avoiding it becoming a serious short connection in the subsequent process, delaying the exposure of potential risks, improving battery quality, and reducing production costs.
Smart Images
Figure CN222979757U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and particularly to a cell case voltage testing device. Background Art
[0002] During the production process of lithium-ion batteries, the voltage performance of lithium-ion batteries plays an important role. In the industry, the positive and negative electrode case voltages are generally monitored during the film wrapping section in the process of manufacturing the cells. However, when monitoring the positive and negative electrode case voltages during the film wrapping section, only the cases where the case voltage is abnormal caused by serious external short circuit or internal short circuit can be screened out. For the presence of foreign objects inside the wound core or the micro-lap between the tab and the case, it cannot cause obvious abnormality in the negative electrode case voltage.
[0003] In the above situations, the batteries will be regarded as qualified products and transferred. During the subsequent assembly process or charge and discharge process, the micro-short circuit will very likely become a serious short circuit, delaying the exposure of potential risks, seriously affecting the battery quality, and increasing the production cost.
[0004] In addition, when using a testing device to test the voltage of a battery, generally the case voltage of the cell is directly tested. Summary of the Utility Model
[0005] In view of this, the embodiments of the present application provide a cell case voltage testing device to solve at least one problem in the background art.
[0006] In a first aspect, the embodiments of the present application provide a cell case voltage testing device, including:
[0007] A limiting component, including a fixed part and a movable part. A cell is placed between the fixed part and the movable part. The movable part can approach or move away from the fixed part so that the movable part moves away from or abuts against the surface of the cell.
[0008] A pressing component, including a first driving part and a pressing part. The pressing part is connected to the first driving part. The pressing part moves along a first direction under the action of the first driving part to move away from or press against the surface of the movable part.
[0009] A probe component, including a test probe and a moving part. The test probe is connected to the moving part. The test probe is disposed opposite to the positive and negative electrode posts of the cell. The test probe moves along a second direction under the action of the moving part to contact or move away from the positive and negative electrode posts of the cell and the case of the cell. The second direction is perpendicular to the first direction.
[0010] Combined with the first aspect of the present application, in an optional embodiment, the limiting component further includes a first slide rail extending along the first direction, and the movable part is slidably connected to the first slide rail.
[0011] In combination with the first aspect of the present application, in an alternative embodiment, the limiting component further includes a plurality of guide rods extending along the first direction. A plurality of the movable members are sleeved on the guide rods, and the battery cells are placed between adjacent movable members. Under the action of the pressing component, the plurality of movable members move along the guide rods towards the fixed member and respectively abut against the surfaces of the plurality of battery cells.
[0012] In combination with the first aspect of the present application, in an alternative embodiment, the plurality of guide rods are respectively inserted through the respective vertex angles of the movable members.
[0013] In combination with the first aspect of the present application, in an alternative embodiment, the limiting component further includes a plurality of elastic members. The elastic members are connected between adjacent movable members and between the fixed member and the movable member closest to it, and the elastic force directions generated by the plurality of elastic members are all in the first direction.
[0014] In combination with the first aspect of the present application, in an alternative embodiment, the pressing component further includes a pressure sensor. The pressure sensor is connected to the movable member close to the pressing member, and the pressure sensor is used to detect the pressure value applied to the movable member.
[0015] In combination with the first aspect of the present application, in an alternative embodiment, the pressing component further includes a pressing plate. The pressing plate is connected to the end of the guide rod and is located between the pressure sensor and the pressing member.
[0016] In combination with the first aspect of the present application, in an alternative embodiment, the probe component further includes a second slide rail. The second slide rail extends along the second direction, and the moving member is slidably connected to the second slide rail.
[0017] In combination with the first aspect of the present application, in an alternative embodiment, the probe component further includes a third slide rail. The third slide rail is connected to the moving member, and the third slide rail extends along a third direction. The third direction is the straight line direction formed by the positive and negative electrode posts of the battery cell;
[0018] The test probe includes a fixed probe and a movable probe. The movable probe is connected to the third slide rail, and the movable probe moves along the third direction to approach or move away from the fixed probe.
[0019] In combination with the first aspect of the present application, in an alternative embodiment, the battery cell housing voltage test device further includes: a distance measuring sensor, connected to the movable member and used to detect the distances between adjacent movable members in the first direction and between the fixed member and the movable member closest to it.
[0020] The cell case voltage testing device provided by the embodiments of the present application uses a pressing component to add a pressing process in the film wrapping section to test the positive and negative case voltages, so that the abnormal case voltage caused by existing micro-shorts is exposed in advance, the risk of aluminum case corrosion is identified in advance, the operation is simple, and the cost is reduced and the efficiency is increased.
[0021] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings described herein are used to provide a further understanding of the present application, and constitute a part of the present application. The illustrative embodiments and descriptions thereof of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. In the drawings:
[0023] Figure 1 is a schematic structural diagram of the first state of the cell case voltage testing device provided by the embodiments of the present application;
[0024] Figure 2 is Figure 1 an enlarged view of part A in
[0025] Figure 3 is a schematic structural diagram of the second state of the cell case voltage testing device provided by the embodiments of the present application;
[0026] Figure 4 is Figure 3 an enlarged view of part B in
[0027] Figure 5 is a schematic structural diagram of the test probe and the moving part in the cell case voltage testing device provided by the embodiments of the present application;
[0028] REFERENCE MARKS:
[0029] a, cell; a1, positive electrode post; a2, negative electrode post;
[0030] 10, limiting component; 110, fixing part; 120, moving part; 130, first slide rail; 140, guiding rod; 150, elastic part;
[0031] 20, pressing component; 210, pressing part; 220, pressure sensor; 230, pressing plate;
[0032] 30, probe component; 310, test probe; 311, fixed probe; 312, moving probe; 320, moving part; 330, second slide rail; 340, third slide rail;
[0033] 40, support frame; 50, distance measuring sensor. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0034] Exemplary embodiments disclosed in the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the specific embodiments set forth herein. On the contrary, these embodiments are provided so that the present application can be more thoroughly understood and the scope of the present application disclosed can be fully conveyed to those skilled in the art.
[0035] In the following description, numerous specific details are given in order to provide a more thorough understanding of the present application. However, it will be apparent to one of ordinary skill in the art that the present application may be practiced without one or more of these details. In other instances, well-known features of some technologies are not described in order to avoid confusion with the present application; that is, not all features of the actual embodiments are described here, and the well-known functions and structures are not described in detail.
[0036] In the drawings, for clarity, the dimensions of layers, regions, elements, and their relative dimensions may be exaggerated. Like reference numerals denote like elements throughout.
[0037] It should be understood that when an element or layer is referred to as being "on", "adjacent to", "connected to", or "coupled to" another element or layer, it can be directly on, adjacent to, connected to, or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on", "directly adjacent to", "directly connected to", or "directly coupled to" another element or layer, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Thus, without departing from the teachings of the present application, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion. And when discussing the second element, component, region, layer, or portion, it does not necessarily mean that a first element, component, region, layer, or portion exists in the present application.
[0038] Spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. may be used herein for convenience of description to describe the relationship of one element or feature shown in the figures with other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatial relationship terms are also intended to include different orientations of the device in use and operation. For example, if the device in the drawings is flipped, then an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both the upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are to be interpreted accordingly.
[0039] The purpose of the terms used herein is only to describe specific embodiments and is not a limitation of the present application. As used herein, the singular forms "a", "an" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising" and / or "including", when used in this specification, determine the presence of the stated features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups. As used herein, the term "and / or" includes any and all combinations of the related listed items.
[0040] To fully understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solutions of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may have other embodiments.
[0041] In the prior art, monitoring the voltage of the positive and negative electrode cases in the encapsulation section can only screen for abnormal cases of the case voltage caused by severe external short circuits and internal short circuits. For potential micro-laps caused by defects such as foreign objects or ear flips, they do not cause obvious abnormalities in the negative electrode case voltage, so they are regarded as qualified products and transferred. Thus, in the module assembly stage, the battery cells in the module are affected by the forces between the battery cells, and there is a risk that micro-shorts become severe short circuits, resulting in obvious abnormalities in the negative electrode case voltage, delaying the exposure of potential risks and increasing production costs. In addition, during use, with charging and discharging, the battery cells expand to a certain extent, causing micro-shorts to become severe short circuits, leading to risks of corrosion and leakage of the module and the system housing.
[0042] In view of the above technical problems, an embodiment of the present application provides a battery cell case voltage testing device. The battery cell case voltage testing device uses a pressing assembly to add a pressing process in the encapsulation section to test the voltage of the positive and negative electrode cases, so that abnormal case voltages caused by existing micro-shorts are exposed in advance, the risk of aluminum case corrosion is identified in advance, the operation is simple, and the effect of reducing costs and increasing efficiency is achieved.
[0043] The following specifically describes the cell case voltage testing device provided by the embodiments of the present application in conjunction with the accompanying drawings.
[0044] As Figures 1 to 4 shown, the cell case voltage testing device provided by the embodiments of the present application includes a support frame 40, a limiting component 10, a pressing component 20, and a probe component 30. The limiting component 10, the pressing component 20, and the probe component 30 are all installed on the support frame 40.
[0045] Among them, the limiting component 10 includes a fixing member 110 and a movable member 120. A cell a is placed between the fixing member 110 and the movable member 120. The movable member 120 can approach or move away from the fixing member 110 so that the movable member 120 moves away from or abuts against the surface of the cell a. The pressing component 20 includes a first driving member (not shown in the figure) and a pressing member 210. The pressing member 210 is connected to the first driving member. Under the action of the first driving member, the pressing member 210 moves along the first direction, that is, Figure 1 the x-axis direction of the coordinate system shown in Figure 1 to move away from or abut against the surface of the movable member 120. The probe component 30 includes a test probe 310 and a moving member 320. The test probe 310 is connected to the moving member 320. The test probe 310 is disposed opposite to the positive and negative electrode posts of the cell a. Under the action of the moving member 320, the test probe 310 moves along the second direction, that is,
[0046] the z-axis direction of the coordinate system shown in
[0047] Figure 1 to contact or move away from the positive and negative electrode posts of the cell a and the case of the cell a. The second direction is perpendicular to the first direction. The first driving member is a cylinder drive, but of course it is not limited to cylinder drive. Figure 1Move along the x-axis direction of the coordinate system and press against the surface of the battery cell a. When in the first state, the probe assembly 30 is away from the battery cell a.
[0048] Figure 3 Fig. shows a schematic diagram of the second state of the battery cell a shell voltage testing device. When in the second state, the test probe 310 contacts the positive and negative electrode posts and the shell of the battery cell a to test the shell voltage of the battery cell a.
[0049] In an alternative embodiment, as Figure 1 and Figure 2 shown, the limiting component 10 further includes a first slide rail 130, the first slide rail 130 extends along the first direction, and the movable member 120 is slidably connected to the first slide rail 130.
[0050] Slidably connecting one or more movable members 120 to the first slide rail 130 can improve the movement consistency and movement efficiency of the movable member 120.
[0051] In an alternative embodiment, as Figure 1 and Figure 2 shown, the limiting component 10 further includes a plurality of guide rods 140 extending along the first direction, a plurality of movable members 120 are sleeved on the guide rods 140, the battery cells a are placed between adjacent movable members 120, and the plurality of movable members 120 move along the guide rods 140 towards the fixing member 110 under the action of the pressing component 20 and respectively abut against the surfaces of the plurality of battery cells a.
[0052] The number of the battery cells a is preferably multiple, and multiple battery cells a can be tested simultaneously to improve the test efficiency. Of course, the number of the battery cells a can also be one, and the embodiments of the present application do not make a limitation.
[0053] In an alternative embodiment, sleeving a plurality of movable members 120 on the guide rods 140 at the same time can improve the movement consistency of the plurality of battery cells a and avoid the position deviation of the battery cells a during the movement process, which affects the test effect.
[0054] A plurality of guide rods 140 are respectively inserted through the respective top corners of the movable member 120, and the guide rods 140 located at the top corners can play a role in limiting the battery cell a. One end of the guide rod 140 is fixedly connected to the fixing member 110, and the other end is fixedly connected to the support frame 40.
[0055] In an alternative embodiment, the limiting component 10 further includes a plurality of elastic members 150, the elastic members 150 are connected between adjacent movable members 120 and between the fixing member 110 and the movable member 120 close to it, and the elastic force directions generated by the plurality of elastic members 150 are all the first direction.
[0056] After the test is completed, the first driving member drives for reset, and the plurality of movable members 120 return to their original positions under the action of the plurality of elastic members 150, so as to facilitate the placement of the battery cell a to be tested next, and further improve the test efficiency of the shell voltage of the battery cell a.
[0057] In an alternative embodiment, the pressing assembly 20 further includes a pressure sensor 220. The pressure sensor 220 is connected to the movable member 120 close to the pressing member 210, and the pressure sensor 220 is used to detect the pressure value applied to the movable member 120.
[0058] The pressure value range applied to the battery cell a is controlled by the pressure sensor 220. For example, the pressure value range is 2000 - 3000N. The use of the pressure sensor 220 can ensure the contact between the battery cell a and the housing, and at the same time can avoid the adverse effect on the performance of the battery cell a due to excessive pressure between the battery cell a and the housing. The pressing time is set according to specific requirements, and is not limited in the embodiments of the present application. For example: 40 - 60s.
[0059] In an alternative embodiment, as Figure 1 and Figure 4 shown, the pressing assembly 20 further includes a pressing plate 230. The pressing plate 230 is connected to the end of the guide rod 140 and is located between the pressure sensor 220 and the pressing member 210.
[0060] The area of the pressing plate 230 is close to the area of the movable member 120. Under the action of the first driving member, the pressing member 210 acts on the pressing plate 230, and the pressing plate 230 acts on the pressure sensor 220 and then acts on the movable member 120. The pressing plate 230 can make the pressure sensor 220 and the plurality of movable members 120 receive uniform force and ensure the test accuracy.
[0061] In an alternative embodiment, as Figure 1 and Figure 3 shown, the probe assembly 30 further includes a second slide rail 330. The second slide rail 330 extends along the second direction, and the moving member 320 is slidably connected to the second slide rail 330.
[0062] The probe assembly 30 moves along the second slide rail 330 to realize the switching between the first state and the second state of the test device, and further improve the test efficiency.
[0063] In an alternative embodiment, as Figure 1 and Figure 5 shown, the probe assembly 30 further includes a third slide rail 340. The third slide rail 340 is connected to the moving member 320, and the third slide rail 340 extends along the third direction, that is, Figure 1 the y-axis direction in the coordinate system shown in
[0064] The test probe 310 includes a fixed probe 311 and a movable probe 312. The movable probe 312 is connected to the third slide rail 340, and the movable probe 312 moves along the third direction to approach or move away from the fixed probe 311.
[0065] As Figure 2 shown, the movable probe 312 approaching or moving away from the fixed probe 311 enables the probe assembly 30 to be applicable to the tests of battery cells a of different specifications, improving the adaptability of the battery cell a shell voltage testing device. For example: by moving the movable probe 312 to change the distance between the movable probe 312 and the fixed probe 311, so that the distance between the movable probe 312 and the fixed probe 311 matches the distance between the positive electrode post a1 and the negative electrode post a2 of the battery cell a.
[0066] In an alternative embodiment, as Figure 2 shown, the battery cell a shell voltage testing device further includes a distance measuring sensor 50. The distance measuring sensor 50 is connected to the movable member 120, and the distance measuring sensor 50 is used to detect the distances between adjacent movable members 120 in the first direction and between the fixed member 110 and the adjacent movable member 120 thereto.
[0067] The distances measured by the distance measuring sensor 50 can correspond to the thickness changes of the battery cell a before and after pressurization. Furthermore, through the distance measuring sensor 50, it is possible to prevent the battery cell a from being over-pressurized and affecting its performance. In fact, the distance measuring sensor 50 and the pressure sensor 220 are jointly used to detect the change values during the pressurization test to complete the battery cell shell voltage test on the premise of ensuring the performance of the battery cell a.
[0068] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the claims. Without departing from the scope of the present disclosure, various deformations and changes can also be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can also be arbitrarily combined to form additional embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.
Claims
1. A battery cell shell voltage testing device, characterized in that: include: A limiting assembly (10) comprises a fixed part (110) and a movable part (120), wherein a battery cell (a) is placed between the fixed part (110) and the movable part (120), and the movable part (120) can approach or move away from the fixed part (110) so that the movable part (120) moves away from or abuts against a surface of the battery cell (a); A pressure-applying assembly (20), comprising a first driving member and a pressing member (210), wherein the pressing member (210) is connected to the first driving member, and under the action of the first driving member, the pressing member (210) moves along a first direction to move away from or press against a surface of the movable member (120); The probe assembly (30) comprises a test probe (310) and a moving part (320), wherein the test probe (310) is connected to the moving part (320), the test probe (310) is arranged opposite to the positive and negative poles of the battery cell (a), and the test probe (310) moves along a second direction under the action of the moving part (320) to contact or move away from the positive and negative poles of the battery cell (a) and the shell of the battery cell (a), and the second direction is perpendicular to the first direction.
2. The battery cell shell voltage testing device according to claim 1, characterized in that: The limiting assembly (10) further comprises a first slide rail (130), wherein the first slide rail (130) extends along the first direction, and the movable member (120) is slidably connected to the first slide rail (130).
3. The battery cell shell voltage testing device according to claim 2, characterized in that: The limiting assembly (10) further comprises a plurality of guide rods (140) extending along the first direction, a plurality of the movable parts (120) being mounted on the guide rods (140), the battery cells (a) being placed between adjacent movable parts (120), and the plurality of movable parts (120) moving along the guide rods (140) toward the fixed part (110) under the action of the pressure-applying assembly (20) and respectively abutting against the surfaces of the plurality of battery cells (a).
4. The battery cell shell voltage testing device according to claim 3, characterized in that: The plurality of guide rods (140) are respectively inserted into each vertex of the movable member (120).
5. The battery cell shell voltage testing device according to claim 1 or 2, characterized in that: The limiting assembly (10) further comprises a plurality of elastic members (150), wherein the elastic members (150) are connected between adjacent movable members (120) and between the fixed member (110) and the movable member (120) adjacent thereto, and the direction of the elastic force generated by the plurality of elastic members (150) is the first direction.
6. The battery cell shell voltage testing device according to claim 3, characterized in that: The pressure-applying assembly (20) further comprises a pressure sensor (220), wherein the pressure sensor (220) is connected to the movable member (120) close to the pressing member (210), and the pressure sensor (220) is used to detect the pressure value applied to the movable member (120).
7. The battery cell shell voltage testing device according to claim 6, characterized in that: The pressure-applying assembly (20) further comprises a pressure plate (230), wherein the pressure plate (230) is connected to the end of the guide rod (140) and is located between the pressure sensor (220) and the pressing member (210).
8. The battery cell shell voltage testing device according to claim 1, characterized in that: The probe assembly (30) further comprises a second slide rail (330), wherein the second slide rail (330) extends along the second direction, and the moving member (320) is slidably connected to the second slide rail (330).
9. The battery cell shell voltage testing device according to claim 1, characterized in that: The probe assembly (30) further comprises a third slide rail (340), wherein the third slide rail (340) is connected to the moving member (320), and the third slide rail (340) extends along a third direction, wherein the third direction is a straight line direction formed by the positive and negative poles of the battery cell (a); The test probe (310) comprises a fixed probe (311) and a movable probe (312); the movable probe (312) is connected to the third slide rail (340); and the movable probe (312) moves along the third direction to approach or move away from the fixed probe (311).
10. The battery cell shell voltage testing device according to claim 1, characterized in that: Also includes: The distance measuring sensor (50) is connected to the movable member (120) and is used to detect the distance between adjacent movable members (120) in the first direction and the distance between the fixed member (110) and the movable member (120) adjacent to it.