Battery test fixture and battery production system

Abstract

The embodiment of the application provides a battery test fixture and a battery production system, and relates to the technical field of batteries. The battery test fixture comprises a first clamping piece, a guide piece, a second clamping piece and an elastic limiting mechanism. The guide piece is installed on the first clamping piece. The second clamping piece is installed on the guide piece and forms a clamping space for clamping a battery monomer with the first clamping piece. The second clamping piece is configured to be capable of moving on the guide piece in a direction close to or away from the first clamping piece. The elastic limiting mechanism is located on the side of the second clamping piece away from the first clamping piece and is connected with the second clamping piece and the end of the guide piece away from the second clamping piece, respectively. The application improves the fixture originally forming a rigid clamping battery monomer to an elastic clamping battery monomer, thereby reducing the lithium precipitation phenomenon generated in the subsequent charging process due to the electrolyte in the battery monomer being squeezed out under the action of a large clamping force, and improving the performance and safety of the battery monomer.

Description

Technical Field

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

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the production process of battery devices, it is necessary to use fixtures to perform cyclic charge and discharge tests on individual battery cells or battery cell assemblies. However, during the charge and discharge tests, some battery cells exhibit lithium plating, which affects the performance and safety of the battery cells. Therefore, how to reduce the possibility of lithium plating in battery cells during cyclic charge and discharge tests is a research direction in battery technology. Utility Model Content

[0004] This application provides a battery testing fixture and a battery production system that can reduce the possibility of lithium plating in individual battery cells during cyclic charge-discharge testing.

[0005] In a first aspect, embodiments of this application provide a battery testing fixture, including a first clamping member, a guide member, a second clamping member, and an elastic limiting mechanism. One end of the guide member is mounted on the first clamping member, and the other end is disposed away from the first clamping member. The second clamping member is mounted on the guide member and forms a clamping space with the first clamping member for clamping a single battery cell. The second clamping member is configured to move on the guide member in a direction close to or away from the first clamping member. The elastic limiting mechanism is located on the side of the second clamping member away from the first clamping member. One end of the elastic limiting mechanism is connected to the end of the guide member away from the first clamping member, and the other end is connected to the second clamping member. The elastic limiting mechanism is used to limit the travel distance of the second clamping member on the guide member.

[0006] By adopting the above technical solution, the second clamping member is movably installed on the guide member, and the movement of the second clamping member on the guide member is limited by the elastic limiting mechanism. This improves the original clamping device that rigidly clamps the battery cell to elastically clamp the battery cell, thereby reducing the lithium plating phenomenon that occurs during subsequent charging due to the electrolyte in the battery cell being squeezed out under the action of a large clamping force, and improving the performance and safety of the battery cell.

[0007] In some embodiments of this application, the elastic limiting mechanism includes an elastic element, one end of which is connected to the second clamping member, and the other end of which is connected to the end of the guide member opposite to the second clamping member.

[0008] By adopting the above technical solution, the elastic limiting mechanism is designed to include an elastic element. The elastic element is connected to the second clamping element and the guide element respectively to achieve elastic limiting of the second clamping element. The structure is simple and easy to implement.

[0009] In some embodiments of this application, the elastic limiting mechanism further includes a limiting member, which is installed on the end of the guide member away from the first clamping member, and the elastic member is connected to the guide member through the limiting member.

[0010] By adopting the above technical solution, the elastic limiting mechanism is designed to include a limiting component, and the elastic component connects to the guide component through the limiting component, which facilitates the assembly of the elastic component.

[0011] In some embodiments of this application, the limiting member is threadedly connected to the guide member.

[0012] By adopting the above technical solution, the limiting component and the guide component are designed to be threadedly connected. The distance between the second clamping component and the first clamping component can be adjusted by turning the limiting component, thereby better clamping the battery cell.

[0013] In some embodiments of this application, the elastic element is sleeved on the guide element.

[0014] By adopting the above technical solution, the elastic element is sleeved on the guide element, which improves the installation stability of the elastic element and its stability during the expansion and contraction process.

[0015] In some embodiments of this application, the battery test fixture further includes a displacement detection component for detecting the distance the second clamping member moves on the guide member.

[0016] By using the above technical solution, the displacement detection component can measure the distance the second clamping member moves on the guide member, thereby indirectly obtaining the deformation ratio of the battery cell's outer shell to determine whether the battery cell is at risk of sinking.

[0017] In some embodiments of this application, the displacement detection component includes a scale and a pointer. The scale is mounted on one of the first clamping member and the second clamping member, and the pointer is mounted on the other of the first clamping member and the second clamping member. The scale and the pointer are arranged at intervals along a first direction, and the pointer is used to indicate the scale of the scale. The first direction is the length direction of the first clamping member.

[0018] The above technical solution uses the relative movement of a ruler and a pointer to determine the relative displacement of the first clamping member and the second clamping member, thereby indirectly obtaining the deformation ratio of the battery cell's casing. The structure is simple and cost-effective.

[0019] In some embodiments of this application, the scale pointer includes a support portion and a pointer portion. The support portion is connected to the first clamping member or the second clamping member and is arranged parallel to and spaced apart from the scale along the first direction. The pointer portion is connected to the support portion at an angle and is used to indicate the scale of the scale.

[0020] By adopting the above technical solution, the scale pointer is designed to include a support part and a pointer part connected at an angle. The support part enables the pointer part to be aligned with the scale on the ruler, thereby facilitating the reading of the ruler.

[0021] In some embodiments of this application, the battery test fixture further includes a heat exchanger, which is mounted on at least one of the first clamping member and the second clamping member, and the heat exchanger is used to exchange heat with the battery cell located in the clamping space.

[0022] By adopting the above technical solution, the battery test fixture is designed to include a heat exchanger. The heat exchanger is used to reduce the temperature of the battery cells held by the battery test fixture, thereby reducing the possibility of the battery cells being damaged due to excessive temperature during charge and discharge tests.

[0023] In some embodiments of this application, the heat exchanger is mounted on the side of the first clamping member facing the second clamping member, and / or the heat exchanger is mounted on the side of the second clamping member facing the first clamping member.

[0024] By adopting the above technical solution, a heat exchanger is installed on the side of the first clamping member facing the second clamping member, and / or a heat exchanger is installed on the side of the second clamping member facing the first clamping member. The heat exchanger directly contacts the battery cell, which can more effectively cool the battery cell.

[0025] In some embodiments of this application, the heat exchanger is provided with a cooling medium flow path and a cooling medium outlet connected to the cooling medium flow path.

[0026] By adopting the above technical solution, a cooling medium flow path is provided inside the heat exchanger. The cooling medium flow port can be used to replenish or circulate the coolant, thereby further improving the cooling efficiency of the battery cells.

[0027] Secondly, embodiments of this application provide a battery production system, including a battery testing fixture as described in the above technical solution. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0029] Figure 1 A schematic diagram of the battery testing fixture provided in some embodiments of this application from a first-view perspective;

[0030] Figure 2 A schematic diagram of the battery testing fixture provided in some embodiments of this application from a second perspective;

[0031] Figure 3 A schematic diagram of the battery testing fixture provided in some embodiments of this application from a third-person perspective;

[0032] Figure 4 This is a structural schematic diagram of a battery testing fixture provided in some embodiments of this application from a fourth-view perspective.

[0033] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0034] 100. Battery testing fixture;

[0035] 10. First clamping element; 11. First surface;

[0036] 20. Guide components;

[0037] 30. Second clamping element; 31. Second surface;

[0038] 40. Flexible limiting mechanism; 41. Elastic element; 42. Limiting element; 43. Gasket;

[0039] 50. Displacement detection component; 51. Scale; 52. Scale pointer; 521. Support part; 522. Pointer part;

[0040] 60. Heat exchanger; 61. Cooling medium flow port;

[0041] 200. Battery cell;

[0042] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0043] 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 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.

[0044] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "including," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0045] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0047] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0049] In this application, "multiple" means two or more (including two).

[0050] The embodiments of this application will now be described in detail.

[0051] Currently, battery devices are being used more and more widely. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0052] The battery assembly includes a battery casing and individual battery cells located within the casing. After the individual battery cells are manufactured, they undergo cyclic charge-discharge testing to evaluate their lifespan and electrode interface stability (electrode interface stability refers to the state of the negative electrode after disassembling the battery when it is charged to 100% SOC). This test simulates multiple charge-discharge cycles (0% SOC to 100% SOC cycle) throughout the battery's lifespan and observes changes in the electrode interface state.

[0053] During charging, especially when the SOC (State of Charge) of the battery reaches 70% or more, the expansion of the graphite negative electrode due to lithium intercalation can cause the bare cell to come into contact with the inner wall of the battery casing, resulting in electrode deformation. To address this, related technologies use clamps to rigidly limit the battery cells to reduce the possibility of electrode deformation.

[0054] However, after the clamps rigidly limit the battery cells, the interaction force between the casing and the expanded electrode will squeeze the electrolyte, causing a transmission break during the 70%-100% SOC charging stage due to electrolyte loss. This results in insufficient lithium-ion migration rate and triggers lithium plating at the negative electrode (lithium plating refers to the phenomenon where lithium ions are not properly embedded in the negative electrode material during the charging process of a lithium-ion battery, but are deposited on the surface of the negative electrode in the form of elemental lithium, which has capacity decay problems and even safety risks). This seriously affects the accuracy of battery factory quality assessment and product stability.

[0055] Therefore, reducing the possibility of lithium plating in battery cells during cyclic charge-discharge testing is an important issue in battery manufacturing.

[0056] In view of this, this application provides a technical solution that solves the above-mentioned technical problems by improving the battery test fixture from the original rigid clamping limit to an elastic clamping limit.

[0057] The following is in conjunction with the appendix Figure 1-4 The battery testing fixture 100 provided in the embodiments of this application will be described, wherein... Figure 1This can be understood as a 3D view of the battery testing fixture 100. Figure 2 This can be understood as a side view of the battery testing fixture 100. Figure 3 This can be understood as the left view of the battery testing fixture 100. Figure 4 This can be understood as a top view of the battery test fixture 100.

[0058] Combined with appendix Figure 1-4 As shown, this application embodiment provides a battery testing fixture 100, including a first clamping member 10, a guide member 20, a second clamping member 30, and an elastic limiting mechanism 40. One end of the guide member 20 is mounted on the first clamping member 10, and the other end is disposed away from the first clamping member 10. The second clamping member 30 is mounted on the guide member 20 and forms a clamping space with the first clamping member 10 for clamping a battery cell 200. The second clamping member 30 is configured to move on the guide member 20 in a direction close to or away from the first clamping member 10. The elastic limiting mechanism 40 is located on the side of the second clamping member 30 away from the first clamping member 10. One end of the elastic limiting mechanism 40 is connected to the end of the guide member 20 away from the first clamping member 10, and the other end is connected to the second clamping member 30. The elastic limiting mechanism 40 is used to limit the movement stroke of the second clamping member 30 on the guide member 20.

[0059] The battery cell 200 in this embodiment includes, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, and magnesium-ion batteries. The shape of the battery cell 200 can be cylindrical, flat, cuboid, or any other arbitrary structure.

[0060] The battery cell 200 mainly consists of electrode components and electrolyte. The electrode components include a positive electrode, a negative electrode, and a separator. The positive electrode comprises an aluminum current collector and a layer of positive active material coated on it (such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide), and has uncoated positive electrode tabs. The negative electrode comprises a copper current collector and a layer of carbon or silicon-based negative active material coated on it, and has uncoated negative electrode tabs. The separator is typically made of PP or PE material. The battery cell 200 achieves its charging and discharging function through the migration of metal ions (such as lithium ions) between the positive and negative electrodes.

[0061] The battery cell 200 described in this embodiment can be widely used in various electrical devices, including vehicles (such as gasoline-powered cars and new energy vehicles), mobile devices (mobile phones, laptops), industrial equipment (power tools, ships), spacecraft (airplanes, rockets), and electric toys. New energy vehicles include pure electric, hybrid, and range-extended electric vehicles; power tools include electric drills, grinders, wrenches, etc.; electric toys include game consoles, model vehicles, etc. This application does not limit the specific application scenario and is applicable to all devices that require battery power.

[0062] In this embodiment, the first clamping member 10 and the second clamping member 30 can be plate-shaped or block-shaped, respectively. The shapes of the first clamping member 10 and the second clamping member 30 can be rectangular, circular, or hexagonal, etc., which will not be listed one by one in this embodiment.

[0063] The first clamping member 10 and the second clamping member 30 can be made of metal or non-metal with a certain strength (such as plastic).

[0064] In some embodiments, the length directions of the first clamping member 10 and the second clamping member 30 may be respectively arranged along the first direction X, and the width directions of the first clamping member 10 and the second clamping member 30 may be respectively arranged along the second direction Y. Alternatively, the length directions of the first clamping member 10 and the second clamping member 30 may be respectively arranged along the second direction Y, and the width directions of the first clamping member 10 and the second clamping member 30 may be respectively arranged along the first direction X (this embodiment is not shown in the figure).

[0065] The first clamping member 10 and the second clamping member 30 are arranged at intervals along the third direction Z in the figure. In some embodiments, the first direction X, the second direction Y and the third direction Z intersect each other. Further, the first direction X, the second direction Y and the third direction Z can be perpendicular to each other.

[0066] The first clamping member 10 has a first surface 11 facing the second clamping member 30, and the second clamping member 30 has a second surface 31 facing the first clamping member 10. When the battery cell 200 is charged and discharged, the positive and negative terminals of the battery cell 200 located between the first clamping member 10 and the second clamping member 30 are connected to a charge and discharge detection device (not shown in the figure) for cyclic charge and discharge detection.

[0067] The guide member 20 in this embodiment can be a rod-shaped member or a strip-shaped member, and its cross-section can be circular, rectangular, triangular, etc. This embodiment will not list them all.

[0068] One end of the guide member 20 is fixedly installed on the first clamping member 10. The installation method can be mechanical connection method such as welding, plugging, bolting, etc. The other end of the guide member 20 is set away from the first clamping member 10.

[0069] The guide member 20 is used to install the second clamping member 30. The installation method can be that the second clamping member 30 has a first connecting hole (not shown in the figure), and the guide member 20 passes through the first connecting hole into the second clamping member 30. The guide member 20 and the first connecting hole can be in a sliding fit or a clearance fit, so that the second clamping member 30 can move on the guide member 20 in a direction close to or away from the first clamping member 10 (the third direction Z in the figure).

[0070] In some embodiments, there are multiple guide members 20, such as the four shown in the figure. The multiple guide members 20 are respectively inserted through the second clamping member 30 and are arranged at intervals along the circumference of the second clamping member 30, thereby improving the stability of the second clamping member 30 during movement.

[0071] In order to enable the second clamping member 30 to elastically limit the battery cell 200 after clamping the battery cell 200, an elastic limiting mechanism 40 is installed at the end of the guide member 20 away from the first clamping member 10. The elastic limiting mechanism 40 is connected to the guide member 20 and the second clamping member 30 respectively.

[0072] When the battery cell 200 is installed between the first clamping member 10 and the second clamping member 30, the elastic limiting mechanism 40 can be compressed or is in an initial state without force. When the battery cell 200 expands during charging and discharging, causing the second clamping member 30 to move away from the first clamping member 10, the elastic limiting mechanism 40 is compressed, thereby giving the second clamping member 30 a force in the opposite direction, thus better clamping and limiting the battery cell 200.

[0073] Since the second clamping member 30 can be moved by the battery cell 200, the second clamping member 30 will not exert a rigid limiting force on the casing of the battery cell 200. This reduces the lithium plating phenomenon that occurs during subsequent charging due to the electrolyte in the battery cell 200 being squeezed out under a large clamping force, thereby improving the performance and safety of the battery cell 200.

[0074] In some examples, the elastic limiting mechanism 40 may optionally include an elastic element 41, one end of which is connected to the second clamping member 30, and the other end of which is connected to the end of the guide member 20 opposite to the second clamping member 30.

[0075] The elastic element 41 can be a spring, a rubber body, a silicone body, or a bellows, metal spring sheet, etc. This embodiment will not list them all, as long as they can elastically limit the second clamping element 30.

[0076] One end of the elastic member 41 is connected to the second clamping member 30. The connection method can be direct connection or indirect connection. Direct connection can be plug-in, snap-fit, welding and bonding. Indirect connection can be achieved by connecting the elastic member 41 and the second clamping member 30 through an intermediate medium (this embodiment is not shown in the figure). As long as the second clamping member 30 can be guaranteed to have positional stability on the guide member 20, it is acceptable.

[0077] The other end of the elastic element 41 is connected to the guide element 20. The connection method can be a direct connection or an indirect connection through the limiting element 42 described below.

[0078] In this embodiment, the elastic limiting mechanism 40 is designed to include an elastic element 41. The elastic element 41 is connected to the second clamping member 30 and the guide member 20 respectively to achieve elastic limiting of the second clamping member 30. The structure is simple and easy to implement.

[0079] In some examples, the elastic limiting mechanism 40 may optionally include a limiting member 42, which is mounted on the end of the guide member 20 away from the first clamping member 10, and the elastic member 41 is connected to the guide member 20 through the limiting member 42.

[0080] The limiting member 42 can be fixedly connected to the end of the guide member 20 away from the first clamping member 10, or it can be detachably connected to the end of the guide member 20 away from the first clamping member 10.

[0081] The limiting member 42 can be a block structure or a sleeve attached to the guide member 20. The material of the limiting member 42 can be metal or non-metal.

[0082] The reason for configuring the limiting member 42 is that the elastic member 41 can be sleeved on the guide member 20 or arranged side by side with the guide member 20. The connection between the end of the elastic member 41 and the guide member 20 is relatively inconvenient. Therefore, this embodiment configures the limiting member 42 to connect the guide member 20 and the elastic member 41, so as to facilitate the assembly of the elastic member 41.

[0083] In some examples, the limiting member 42 is optionally threaded to the guide member 20.

[0084] In some embodiments, the limiting member 42 is a nut, and correspondingly, the portion of the guide member 20 located on the side of the second clamping member 30 away from the first clamping member 10 may be provided with external threads, and the remaining portion of the guide member 20 may be a rod-shaped structure with a smooth surface, and the threaded connection is achieved by using the external threads of the guide member 20 and the internal threads of the nut.

[0085] The elastic element 41 can be connected to the nut, and the connection method can be direct connection or indirect connection.

[0086] In some embodiments, a washer 43 may be installed on the side of the nut facing the second clamping member 30, and the nut may be connected to the elastic member 41 through the washer 43.

[0087] The limiting member 42 and the guide member 20 are designed to be threaded together. The clamping distance between the second clamping member 30 and the first clamping member 10 can be adjusted by turning the limiting member 42, thereby better clamping the battery cell 200.

[0088] In some examples, the elastic element 41 is optionally fitted onto the guide element 20.

[0089] The elastic element 41 can be the aforementioned spring, or it can be a structure such as a rubber sleeve or silicone sleeve that can be fitted onto the guide element 20.

[0090] The elastic element 41 is fitted onto the guide element 20, which improves the installation stability of the elastic element 41 and its stability during the expansion and contraction process.

[0091] Furthermore, when the elastic member 41 is sleeved on the guide member 20, the upper end of the elastic member 41 can abut against the aforementioned limiting member 42 (for example, directly abut against the nut or directly abut against the washer 43), and the lower end of the elastic member 41 abuts against the second clamping member 30. Abutting means that in this embodiment, when the battery test fixture 100 is in the state of clamping the battery cell 200, the elastic member 41 abuts against the limiting member 42 or the second clamping member 30.

[0092] In this structure, there is no need to use mechanical connections to connect the elastic element 41 to the limiting element 42 and the second clamping element 30 respectively. It is only necessary to ensure that the elastic element 41 can contact the limiting element 42 and the second clamping element 30 respectively when the battery test fixture 100 is holding the battery cell 200.

[0093] Therefore, the term "connection" in the connection between the elastic member 41 and the limiting member 42 and the connection between the elastic member 41 and the second clamping member 30 in this embodiment should be interpreted broadly, that is, it can include mechanical connection and also the aforementioned contact.

[0094] Combined again with the appendix Figure 1 and 2 As shown, in some instances, the battery test fixture 100 may optionally include a displacement detection component 50 for detecting the distance the second clamp 30 moves on the guide 20.

[0095] The displacement 'a' of the second clamping member 30 when the battery test fixture 100 clamps the battery cell 200 and the battery cell 200 is fully charged for the first time, and the distance 'b' of the second clamping member 30 moving on the guide member 20 after the cyclic charge and discharge test.

[0096] S is calculated manually, by a processor, or by a control circuit using the formula S = (ba) / a, where S is the deformation ratio of the battery cell 200's casing. Then, the processor or control circuit determines whether S is greater than or equal to a first threshold. If S is greater than or equal to the first threshold, the battery cell 200 is at risk of significant deformation; if S is less than the first threshold, the battery cell 200 is considered to have no risk of significant deformation or a low risk. The first threshold can have different ranges depending on the specifications of the battery cell 200. For example, the first threshold can be 0.2%-1%, such as 0.2%, 0.4%, 0.5%, 0.6%, 0.8%, and 1%.

[0097] Of course, in addition to the formula method mentioned above, other methods can be used to determine whether there is a risk of battery cell 200 dropping in capacity. For example, it can be determined whether the distance b that the second clamping member 30 moves on the guide member 20 exceeds the second threshold (the range can be 0.1mm-10mm), or whether ba exceeds the third threshold (the range can be 0.1mm-1mm), to determine whether there is a risk of battery cell 200 dropping in capacity (the phenomenon of sudden and sharp drop in capacity or voltage during battery cycling).

[0098] In some examples, the displacement detection component 50 optionally includes a scale 51 and a scale pointer 52, the scale 51 being mounted on one of the first clamping member 10 and the second clamping member 30, and the scale pointer 52 being mounted on the other of the first clamping member 10 and the second clamping member 30, the scale 51 and the scale pointer 52 being spaced apart along a first direction X, the scale pointer 52 being used to indicate the scale of the scale 51, the first direction X being the length direction of the first clamping member 10.

[0099] The scale 51 can be a millimeter ruler or a vernier caliper, etc. The scale 51 can be fixedly installed on the second clamping member 30 as shown in the figure. Correspondingly, the scale pointer 52 is installed on the first clamping member 10, or the opposite installation form can be adopted (this embodiment is not shown in the figure).

[0100] When the battery cell 200 is held by the battery test fixture 100 of this embodiment and is not charged, the scale pointer 52 points to the first scale of the scale 51. After the battery cell 200 is fully charged, the scale pointer 52 points to the second scale of the scale 51. After the battery cell 200 undergoes a cycle of charging and discharging, the scale pointer 52 points to the third scale of the scale 51. The above-mentioned 'a' is the second scale minus the first scale, and the above-mentioned 'b' is the third scale minus the second scale. Finally, the above-mentioned shell deformation ratio S can be calculated manually or by a calculator, and then the battery cell 200 is manually judged to have a risk of water drop.

[0101] Therefore, the relative displacement of the first clamping member 10 and the second clamping member 30 can be determined by the relative movement of the scale 51 and the scale pointer 52, thereby indirectly obtaining the shell deformation ratio of the battery cell 200. The structure is simple and cost-saving.

[0102] Of course, the structure of the displacement detection component 50 in this embodiment is not limited to this. For example, the displacement detection component 50 can also be a distance sensor component (this embodiment is not shown in the figure). For example, the distance sensor component can include an infrared distance sensor, a laser distance sensor, etc. In this case, a processor or control circuit can be used to communicate with the distance sensor component, and the processor or control circuit can directly determine whether the battery cell 200 has a risk of falling into the water and issue a warning.

[0103] In some examples, the scale pointer 52 may optionally include a support portion 521 and a pointer portion 522. The support portion 521 is connected to the first clamp 10 or the second clamp 30 and is arranged parallel to the scale 51 along the first direction X. The pointer portion 522 is connected to the support portion 521 at an angle and is used to indicate the scale of the scale 51.

[0104] The support part 521 and the pointer part 522 can be integrally formed or integrally connected, and the material of both can be metal or non-metal.

[0105] The scale pointer 52 is designed to include a support part 521 and a pointer part 522 connected at an angle. The support part 521 enables the pointer part 522 to be aligned with the scale on the scale 51, thereby facilitating the reading of the scale 51.

[0106] Furthermore, taking the example of the scale 51 being mounted on the second clamping member 30 and the scale pointer 52 being mounted on the first clamping member 10, the presence of the support part 521 allows the pointer part 522 to have a certain height on the first clamping member 10, thereby reducing the possibility that the scale 51 will be dislodged from the indication range of the scale pointer 52 under the action of the second clamping member 30, and reducing the situation where the scale reading cannot be performed.

[0107] Combined again with the appendix Figure 1-3 As shown, in some examples, the battery test fixture 100 may optionally include a heat exchanger 60, which is mounted on at least one of the first clamping member 10 and the second clamping member 30, and the heat exchanger 60 is used to exchange heat with the battery cell 200 located in the clamping space.

[0108] The heat exchanger 60 refers to a structure that can be installed on the battery test fixture 100 and exchange heat with the battery test fixture 100, thereby reducing the temperature of the battery cell 200 in the clamping space.

[0109] The heat exchanger 60 can be any kind of heat dissipation structure. For example, the heat exchanger 60 can be an air-cooled heat exchanger 60, a water-cooled heat exchanger 60, a phase change material heat exchanger 60, a heat pipe heat exchanger 60, etc. This embodiment will not list them one by one.

[0110] The heat exchanger 60 can be installed on the first clamping member 10 and / or the second clamping member 30. The installation method can be any kind of mechanical connection, such as a fixed connection or a detachable connection.

[0111] During the charge and discharge test of the battery cell 200, the heat exchanger 60 is used to reduce the temperature of the battery cell 200 held by the battery test fixture 100, thereby reducing the possibility of the battery cell 200 being damaged due to excessive temperature during the charge and discharge test.

[0112] In some examples, optionally, a heat exchanger 60 is mounted on the side of the first clamp 10 facing the second clamp 30, and / or, a heat exchanger 60 is mounted on the side of the second clamp 30 facing the first clamp 10.

[0113] The above technical solution includes at least three implementation methods. One method involves a heat exchanger 60 mounted on the first surface 11 of the first clamping member 10 facing the second clamping member 30. The second clamping member 30 may not have the heat exchanger 60 mounted, or the heat exchanger 60 may be mounted on the surface of the second clamping member 30 opposite to the first clamping member 10. Another method involves a heat exchanger 60 mounted on the second surface 31 of the second clamping member 30 facing the first clamping member 10. The first clamping member 10 may not have the heat exchanger 60 mounted, or the heat exchanger 60 may be mounted on the surface of the first clamping member 10 opposite to the second clamping member 30. A third method, as shown in the figure, involves a heat exchanger 60 mounted on the first surface 11 of the first clamping member 10 facing the second clamping member 30, and a heat exchanger 60 mounted on the second surface 31 of the second clamping member 30 facing the first clamping member 10.

[0114] In this way, the heat exchanger 60 can directly contact the battery cell 200, which can more effectively cool the battery cell 200 and further reduce the possibility of the battery cell 200 being affected by high temperature or damaged.

[0115] In some examples, the heat exchanger 60 may optionally have a cooling medium flow path and a cooling medium outlet 61 connected to the cooling medium flow path.

[0116] The heat exchanger 60 can be a plate-shaped component to reduce the occupancy of the clamping space formed by the first clamping component 10 and the second clamping component 30, and to facilitate the clamping of the battery cell 200.

[0117] The heat exchanger 60 has a cooling medium flow path and a cooling medium flow port 61 (not shown in the figure) connected to the cooling medium flow path, so that the heat exchanger 60 forms a water-cooled plate structure. The coolant can be a gas (e.g., air) or a liquid (e.g., water, ethylene glycol aqueous solution, propylene glycol aqueous solution, deionized water, etc.).

[0118] In some embodiments, each heat exchanger 60 may have two cooling medium flow ports 61, one for supplying coolant to the cooling medium flow path and the other for discharging high-temperature or ineffective coolant. This allows the heat exchanger 60 of this embodiment to be connected to an external coolant circulation device, which can supply low-temperature coolant to the cooling medium flow path and remove high-temperature or ineffective coolant.

[0119] In this way, the coolant can be replenished or circulated externally through the cooling medium flow port 61, thereby further improving the cooling efficiency of the battery cell 200.

[0120] Secondly, embodiments of this application provide a battery production system, including a battery testing fixture 100 as described in the above technical solution.

[0121] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0122] Combined with appendix Figure 1-4As shown, this application embodiment provides a battery testing fixture 100, including a first clamping member 10, a guide member 20, a second clamping member 30, and an elastic limiting mechanism 40. One end of the guide member 20 is mounted on the first clamping member 10, and the other end is disposed away from the first clamping member 10. The second clamping member 30 is mounted on the guide member 20 and forms a clamping space with the first clamping member 10 for clamping a battery cell 200. The second clamping member 30 is configured to move on the guide member 20 in a direction close to or away from the first clamping member 10. The elastic limiting mechanism 40 is located on the side of the second clamping member 30 away from the first clamping member 10. One end of the elastic limiting mechanism 40 is connected to the end of the guide member 20 away from the first clamping member 10, and the other end is connected to the second clamping member 30. The elastic limiting mechanism 40 is used to limit the movement stroke of the second clamping member 30 on the guide member 20. The elastic limiting mechanism 40 includes an elastic element 41, one end of which is connected to the second clamping member 30, and the other end of which is connected to the end of the guide member 20 opposite to the second clamping member 30. The elastic limiting mechanism 40 also includes a limiting element 42, which is mounted on the end of the guide member 20 opposite to the first clamping member 10. The elastic element 41 is connected to the guide member 20 via the limiting element 42. The limiting element 42 is threadedly connected to the guide member 20. The elastic element 41 is sleeved on the guide member 20. The battery testing fixture 100 also includes a displacement detection component 50, which is used to detect the distance the second clamping member 30 moves on the guide member 20. The displacement detection assembly 50 includes a scale 51 and a scale pointer 52. The scale 51 is mounted on one of the first clamping member 10 and the second clamping member 30, and the scale pointer 52 is mounted on the other of the first clamping member 10 and the second clamping member 30. The scale 51 and the scale pointer 52 are arranged at intervals along a first direction X, and the scale pointer 52 is used to indicate the scale of the scale 51. The scale pointer 52 includes a support portion 521 and a pointer portion 522. The support portion 521 is connected to the first clamping member 10 or the second clamping member 30 and is arranged parallel to the scale 51 at intervals along the first direction X. The pointer portion 522 is connected to the support portion 521 at an angle and is used to indicate the scale of the scale 51. The battery testing fixture 100 also includes a heat exchanger 60. The heat exchanger 60 is mounted on at least one of the first clamping member 10 and the second clamping member 30, and the heat exchanger 60 is used to exchange heat with the battery cell 200 located in the clamping space. A heat exchanger 60 is mounted on the side of the first clamping member 10 facing the second clamping member 30, and / or, a heat exchanger 60 is mounted on the side of the second clamping member 30 facing the first clamping member 10. The heat exchanger 60 has a cooling medium flow path and a cooling medium flow port 61 connected to the cooling medium flow path inside.

[0123] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery testing fixture, characterized in that, include: First clamping component; The guide member has one end installed on the first clamping member and the other end disposed away from the first clamping member; A second clamping member is mounted on the guide member and forms a clamping space with the first clamping member for clamping a battery cell. The second clamping member is configured to move on the guide member in a direction close to or away from the first clamping member. An elastic limiting mechanism is located on the side of the second clamping member away from the first clamping member. One end of the mechanism is connected to the end of the guide member away from the first clamping member, and the other end is connected to the second clamping member. The elastic limiting mechanism is used to limit the movement of the second clamping member on the guide member. as well as A heat exchanger is mounted on at least one of the first clamping member and the second clamping member, the heat exchanger being used to exchange heat with the battery cell located within the clamping space.

2. The battery testing fixture according to claim 1, characterized in that, The elastic limiting mechanism includes an elastic element, one end of which is connected to the second clamping element, and the other end of which is connected to the end of the guide element that is away from the second clamping element.

3. The battery testing fixture according to claim 2, characterized in that, The elastic limiting mechanism further includes a limiting member, which is installed on the end of the guide member away from the first clamping member, and the elastic member is connected to the guide member through the limiting member.

4. The battery testing fixture according to claim 3, characterized in that, The limiting member is threadedly connected to the guide member.

5. The battery testing fixture according to claim 2, characterized in that, The elastic element is sleeved on the guide element.

6. The battery testing fixture according to claim 1, characterized in that, The battery testing fixture also includes a displacement detection component, which is used to detect the distance the second clamping member moves on the guide member.

7. The battery testing fixture according to claim 6, characterized in that, The displacement detection component includes a scale and a pointer. The scale is installed on one of the first clamping member and the second clamping member, and the pointer is installed on the other of the first clamping member and the second clamping member. The scale and the pointer are arranged at intervals along a first direction. The pointer is used to indicate the scale of the scale. The first direction is the length direction of the first clamping member.

8. The battery testing fixture according to claim 7, characterized in that, The scale pointer includes a support part and a pointer part. The support part is connected to the first clamping member or the second clamping member and is arranged parallel to the scale along the first direction. The pointer part is connected to the support part at an angle and is used to indicate the scale of the scale.

9. The battery testing fixture according to claim 1, characterized in that, The heat exchanger is mounted on the side of the first clamping member facing the second clamping member, and / or the heat exchanger is mounted on the side of the second clamping member facing the first clamping member.

10. The battery testing fixture according to claim 9, characterized in that, The heat exchanger is provided with a cooling medium flow path and a cooling medium outlet connected to the cooling medium flow path.

11. A battery production system, characterized in that, Includes the battery test fixture as described in any one of claims 1-10.

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