Patent Description:
This application relates to the field of batteries, and specifically to a base, a voltage sampling assembly, and a voltage testing apparatus.

Energy conservation and emission reduction are crucial to the sustainable development of the automobile industry. Electric vehicles, with their advantages in energy conservation and emission reduction, have become an important part of sustainable development of the automobile industry. For electric vehicles, battery technology is an important factor in connection with their development.

In the development of battery technology, production cost is another non-negligible issue in addition to performance improvement. If the production cost of batteries cannot be controlled, resulting in low cost performance of the batteries produced, it will be difficult to produce and promote the batteries on a large scale. Therefore, how the production cost of the battery is reduced is a technical problem yet to be solved in battery technology.

Document <CIT> discloses a structure for connecting an electric wire. A core wire is connected to a bus bar. Moreover, an auxiliary terminal T is disclosed that has an electric wire gripping part and welding pieces. A core wire protection part that extends from one end of the electric wire gripping part, is attached to the end side of the covered electric wire. The core wire protection part has a base on which the insulation coating part is mounted.

This application provides a base, a voltage sampling assembly, and a voltage testing apparatus, so that parts used in battery testing can be reused, thereby reducing production cost of batteries, improving cost performance of batteries, and promoting the use of batteries.

According to a first aspect, this application provides a base for mounting a voltage sampling member to perform voltage sampling on a battery cell. The base includes a body and a pair of clamping members. The body is provided with a through hole for the voltage sampling member to run through. The pair of clamping members mounted on the body is configured to clamp a busbar connected to the battery cell. An elastic member connects the body and the clamping members for providing clamping force.

In the technical solution of the embodiments of this application, battery capacity needs to be tested before battery cells are put into use. In a battery capacity testing process, two busbars are respectively connected to the positive and negative electrode terminals of the battery cell, so as to connect the battery cell to the circuit, so that the positive and negative electrode terminals of the battery cell have current flowing therebetween.

The voltage sampling member is connected to the electrode terminal of the battery cell via the through hole on the body and the positioning hole on the busbar, so as to measure the voltage of the battery cell. The voltage sampling member can determine the position of the electrode terminal based on the position of the body. The inner wall of the through hole can support and limit the voltage sampling member, so that the voltage sampling member can be stably disposed in the through hole, thus enhancing the connection stability between the voltage sampling member and the electrode terminal.

The pair of clamping members mounted on the body can clamp the busbar, so that the body can be fastened to the busbar, thereby ensuring the stable connection between the voltage sampling member and the electrode terminal.

After the testing and sampling are completed, the clamping members can release the busbar, and then the base can be moved to the busbar connected to another battery cell that needs to be tested. The clamping members can clamp the new busbar, so that the voltage sampling member can test the new battery cell.

The base can be reused in the testing process of multiple battery cells through the repeated clamping and releasing. This can reduce the number of bases required for positioning the voltage sampling member in the testing process, avoid waste of materials, reduce the production cost of battery cells, improve the cost performance of batteries, and facilitate the promotion of batteries.

In some embodiments, the pair of clamping members are provided on two opposite sides of the body in a first direction, the first direction being perpendicular to an axial direction of the through hole.

In the technical solution of the embodiments of this application, the pair of clamping members can be disposed on two opposite sides of the body. When the pair of clamping members fits with the busbar, in order to clamp the busbar, a direction of the force from the clamping members on the busbar always passes through the axis of the positioning hole, so that the direction of the reaction force from the clamping members on the base can always pass through the axis of the through hole, and the body can maintain force balance on the busbar, to ensure relative fixation of the body and the busbar.

In some embodiments, of the pair of clamping members, one clamping member is rotatably mounted to the body around a first axis, and the other one is rotatably mounted to the body around a second axis, the first axis and the second axis being parallel.

In the technical solution of the embodiments of this application, the pair of clamping members can be rotatably mounted on the body. When the pair of clamping members gets close to the busbar by rotation, the first axis a is parallel to the second axis b. When the clamping members clamp the busbar, the directions of the forces from the pair of clamping members on the busbar can be parallel, and the forces from the pair of clamping members on the busbar can be mutually offset, thus ensuring that the clamping members can stably clamp the busbar.

In some embodiments, the first axis and the second axis extend in a second direction, and the second direction is perpendicular to the first direction and is perpendicular to the axial direction of the through hole.

In the technical solution of the embodiments of this application, a flipping range of the clamping member can be limited to the plane in which the first direction and the axial direction of the through hole lie, and the forces from the pair of clamping members on the busbar can be steadily offset each other, allowing the busbar to maintain force balance.

In the technical solution of the embodiments of this application, the elastic member is connected between the body and the clamping member, and uses its own elasticity to pull the clamping member to close to the busbar. The elasticity of the elastic member can also provide clamping force for the clamping member to clamp the busbar, so that the base can be fastened to the busbar.

In some embodiments, the body has a first surface and a second surface opposite each other in the axial direction of the through hole, and the clamping member includes a clamping end for clamping the busbar and an operating end for manual operation, where the clamping end protrudes from the first surface.

In the technical solution of the embodiments of this application, the clamping end of the clamping member exceeds the first surface, and the clamping end is close to the busbar, so that the busbar is clamped between the clamping ends of the pair of clamping members and the first surface, and the base gets close to and is fastened to the busbar from three directions.

In some embodiments, the clamping end is provided with a snap hook portion for snap hooking on an edge of the busbar.

In the technical solution of the embodiments of this application, when the clamping member clamps the busbar, the snap hook portion can hold the surface of the busbar back away from the first surface, the busbar is clamped between the clamping ends of the pair of clamping members, the first surface, and the snap hook portion, and the base gets close to and is fastened to the busbar from four directions, thereby improving the connection stability between the base and the busbar.

In some embodiments, the clamping end is provided with at least two snap hook portions, where the at least two snap hook portions are spaced apart in a second direction, the first direction is perpendicular to the axial direction of the through hole, and the second direction is perpendicular to the first direction and perpendicular to the axial direction of the through hole.

In the technical solution of the embodiments of this application, the busbar is connected to the electrode terminal, and a gap is present between adjacent snap hook portions to avoid the electrode terminal, thereby protecting the electrode terminal from interference of the snap hook portions.

In some embodiments, the operating end protrudes from the second surface.

In the technical solution of the embodiments of this application, the operating end of the clamping member protrudes from the second surface, so that a user can grasp, push, and pull the clamping member without interfering with the body, simplifying the mounting, unmounting, and movement of the base and making it easier to use.

In some embodiments, a limiting protrusion is formed around the through hole on the first surface, and the limiting protrusion is configured to be inserted into the positioning hole of the busbar.

In the technical solution of the embodiments of this application, the limiting protrusion fits into the positioning hole of the busbar, so that the through hole can be coaxially disposed with the positioning hole of the busbar, and the voltage sampling member can accurately pass through the positioning hole to connect to the electrode terminal by passing through the through hole. This can reduce the time for positioning the electrode terminal in the process of connecting the voltage sampling member to the electrode terminal, thereby improving the testing efficiency of the battery cell.

In some embodiments, the body and the clamping members are made of an insulating material.

In the technical solution of the embodiments of this application, the body and the clamping members are all made of the insulating material, so as to prevent contact between different bases that may lead to short circuit by overlap of positive and negative electrode terminals of the battery cell.

According to a second aspect, a voltage sampling assembly is provided, including the base according to the first aspect and a voltage sampling member, where the voltage sampling member is threaded through the through hole.

In some embodiments, the through hole is provided with internal threads on an inner wall, and the voltage sampling member is provided with external threads matching the internal threads.

In the technical solution of the embodiments of this application, the voltage sampling member runs through the through hole and is fastened in the through hole by threading its external threads with the internal threads of the through hole, the body is fastened to the busbar via the clamping member, and the through hole faces the electrode terminal. This improves the connection stability between the voltage sampling member and the electrode terminal.

According to a third aspect, a voltage testing apparatus is provided, including a processing module and two voltage sampling assemblies according to the second aspect, where voltage sampling members of the two voltage sampling assemblies are all electrically connected to the processing module.

In the technical solution of the embodiments of this application, during the testing of the battery cell, the electrode terminal of the battery cell is connected to the charge/discharge machine via the busbar. The current output from the battery cell is transmitted to the charge/discharge machine only through the busbar, and the charge/discharge machine controls the current flowing through the busbar to be a stable constant current.

The voltage sampling assembly is connected to the positive and negative terminals of the battery cell via the voltage sampling member to collect the output voltage of the battery cell, and can record the operation duration of the battery. The voltage, operation duration of the battery cell, and internal resistance of the charge/discharge machine collected by the voltage sampling assembly are transmitted to the processing module. The processing module processes the data to calculate the battery capacity of the battery cell and obtain the test results of the battery cell, so as to determine whether the battery cell is qualified.

Additional aspects and advantages of this application will be given in part in the following description, part of which will become apparent from the following description or be learned from the practice of this application.

To describe the technical solutions of the embodiments of this application more clearly, the following briefly describes the accompanying drawings required for describing the embodiments. It is appreciated that the accompanying drawings below show merely some embodiments of this application and thus should not be considered as limitations on the scope. Persons of ordinary skill in the art may still derive other related drawings from the accompanying drawings without creative efforts.

The accompanying drawings are not drawn to scale.

Reference signs: <NUM>. battery cell; <NUM>. electrode terminal; <NUM>. busbar; <NUM>. positioning hole; <NUM>. base; <NUM>. body; <NUM>. through hole; <NUM>. first surface; <NUM>. second surface; <NUM>. clamping member; <NUM>. clamping end; <NUM>. operating end; <NUM>. snap hook portion; <NUM>. elastic member; <NUM>. fastening pin; <NUM>. limiting protrusion; <NUM>. voltage sampling member; a. first axis; b. second axis; X. first direction; and Y. second direction.

To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following clearly and completely describes the technical solutions in the embodiments of this application with reference to the accompanying drawings in the embodiments of this application. Apparently, the described embodiments are some but not all embodiments of this application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used in this application shall have the same meanings as commonly understood by those skilled in the art to which this application relates. The terms used in the specification of this application are intended to merely describe the specific embodiments rather than to limit this application. The terms "include", "comprise", and any variations thereof in the specification and claims of this application as well as the foregoing description of drawings are intended to cover non-exclusive inclusions. In the specification, claims, or accompanying drawings of this application, the terms "first", "second", and the like are intended to distinguish between different objects rather than to indicate a particular order or relative importance.

Reference to "embodiment" in this application means that specific features, structures, or characteristics described with reference to the embodiment may be included in at least one embodiment of this application. The word "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment or an independent or alternative embodiment that is exclusive of other embodiments. It is explicitly or implicitly understood by persons skilled in the art that the embodiments described herein may be combined with other embodiments.

In the description of this application, it should be noted that unless otherwise specified and defined explicitly, the terms "mount", "connect", "join", and "attach" should be understood in their general senses. For example, they may refer to a fixed connection, a detachable connection, or an integral connection, and may refer to a direct connection, an indirect connection via an intermediate medium, or an internal communication between two elements. A person of ordinary skills in the art can understand specific meanings of these terms in this application as appropriate to specific situations.

The term "and/or" in this application is only an associative relationship for describing associated objects, indicating that three relationships may be present. For example, A and/or B may indicate three cases: presence of only A; presence of both A and B; and presence of only B. In addition, the character "/" in this application generally indicates an "or" relationship between contextually associated objects.

In this application, "a plurality of" means more than two (inclusive). Similarly, "a plurality of groups" means more than two (inclusive) groups, and "a plurality of pieces" means more than two (inclusive) pieces.

In this application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, or the like. This is not limited in the embodiments of this application. The battery cell may be cylindrical, flat, cuboid, or of other shapes, which is not limited in the embodiments of this application either. Battery cells are typically divided into three types by packaging method: cylindrical cell, prismatic cell, and pouch cell. The type of battery is not limited in the embodiments of this application either. The battery cell includes two electrode terminals: one is a positive electrode terminal and the other is a negative electrode terminal. The current flows out of the battery cell through the positive electrode terminal and flows into the battery cell through the negative electrode terminal.

In this application, after production of the battery cells is completed, samples need to be taken for battery capacity testing to filter out inferior products that do not meet the rated standard. The busbar is a component configured for implementing electrical connection between multiple battery cells. The busbar can implement the electrical connection between the battery cells by connecting the electrode terminals of the battery cells. In the battery capacity testing process, the positive electrode terminal and negative electronic terminal of a sample battery cell are electrically connected to the charge/discharge machine through the busbar for discharging, and the voltage testing apparatus measures battery capacity of the battery cell.

The voltage testing apparatus includes a processing module and a voltage sampling assembly. The voltage testing apparatus mainly uses the processing module to process data obtained by the voltage sampling assembly. The voltage sampling assembly includes a voltage sampling member and a base. The busbar is provided with a positioning hole to expose the positive electrode terminal or the negative electrode terminal, and the base is provided in the busbar to facilitate connection of the voltage sampling member to the positive electrode terminal or the negative electrode terminal. The two voltage sampling members are respectively connected to the positive electrode terminal and the negative electrode terminal via the positioning hole to obtain the voltage between the positive and negative electrodes of the battery cell and the operation duration of the battery cell.

Currently, from a perspective of the market development, application of traction batteries is becoming more extensive. Traction batteries have been not only used in energy storage power supply systems such as hydroelectric power plants, thermal power plants, wind power plants, and solar power plants, but also widely used in many other fields including electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, military equipment, and aerospace. With continuous expansion of application fields of traction batteries, market demands for the traction batteries are also expanding.

Before a batch of battery cells is put into use, one or more samples are taken for battery capacity test, and the results of the test are used to determine whether the batch of battery cells meet the rated battery capacity, so as to filter out or scrap battery cells that do not meet the rated battery capacity.

The inventors have noted that in the battery capacity testing process, the voltage sampling member requires the base to ensure its stable connection with the electrode terminals of the battery cell, and the base is fastened to the busbar that is fixedly connected to the electrode terminals. After the battery capacity testing of the battery cell is completed, the used base is discarded, and the voltage sampling member uses a new base to connect the electrode terminals of the new battery cell for sampling. Frequent replacement of bases has an adverse effect on the promotion of battery cells. For example, the busbar is fastened to the electrode terminal of the sample battery cell, and the base is fastened to the busbar by welding (or one-piece molding, or the like). After the battery capacity testing is completed, the base is scrapped together with the busbar and the sample battery cell. The frequent scrap and replacement of bases leads to increased battery production cost.

In order to solve the disadvantage of high battery production cost, the applicants have found that the number of parts that are scrapped after use for battery capacity testing of the battery cells can be reduced. Specifically, a manner for connecting the base and the busbar is changed so that the base can be unmounted from the busbar without damage, making it possible to be recycled.

In view of the foregoing considerations, in order to solve the problem of high cost and low cost performance of battery cells caused by frequent replacement of bases, the inventors have designed a base through in-depth research. The body of the base is assembled with the clamping member and the clamping member clamps the busbar, so that the body can be fastened to the busbar. In the voltage testing apparatus including such base, the clamping member is used to clamp the busbar so that the body of the base is fastened to the busbar, and the voltage sampling member passes through the through hole provided on the body and is stably connected to the electrode terminal of the battery cell with the support from the hole wall of the through hole. After the battery capacity testing is completed, the clamping member can release the busbar to let the base separate from the busbar, and then re-clamp another busbar in the subsequent battery capacity testing process to fasten the body of the base to the battery cell, so that the base can be recycled. This can reduce the number of scrapped bases in the battery capacity testing process, reduce the production cost of batteries, and facilitate the promotion of battery cells.

The base disclosed in embodiment of this application can be used in the battery capacity testing process, but is not limited thereto. The base can also be applied to all battery cell production systems having the base, voltage sampling assembly, and voltage testing apparatus disclosed in this application. In this way, the number of bases scrapped for battery testing can be reduced, thereby reducing the production cost of batteries and facilitating the promotion of batteries.

According to some embodiments of this application, as shown in <FIG>, this application provides a base <NUM>, configured for mounting a voltage sampling member <NUM> for voltage sampling of a battery cell <NUM>. The base <NUM> includes a body <NUM> and a pair of clamping members <NUM>. The body <NUM> is provided with a through hole <NUM> for the voltage sampling member <NUM> to run through. The pair of clamping members <NUM> mounted on the body <NUM> is configured to clamp a busbar <NUM> connected to a battery cell <NUM>.

Battery capacity needs to be tested before the battery cells are put into use. In the battery capacity testing process, two busbars <NUM> are respectively connected to the positive and negative electrode terminals of the battery cell <NUM>, so as to connect the battery cell <NUM> to the circuit, so that the positive and negative electrode terminals of the battery cell <NUM> have current flowing therebetween.

The through hole <NUM> faces a positioning hole <NUM> on the busbar <NUM>, and the voltage sampling member <NUM> is connected to the electrode terminal <NUM> of the battery cell <NUM> via the through hole <NUM> on the body <NUM> and the positioning hole <NUM> on the busbar <NUM>, so as to measure the voltage of the battery cell. The voltage sampling member <NUM> can determine the position of the electrode terminal <NUM> based on the position of the body <NUM>. The inner wall of the through hole <NUM> can support and limit the voltage sampling member <NUM>, so that the voltage sampling member <NUM> can be stably disposed in the through hole <NUM>, thus enhancing the connection stability between the voltage sampling member <NUM> and the electrode terminal <NUM>.

The voltage sampling member <NUM> can slidably fit with the inner wall of the through hole <NUM>, so that the through hole <NUM> has some limiting function for the voltage sampling member <NUM> and the voltage sampling member <NUM> can pass through the through hole <NUM> and the positioning hole <NUM> to be electrically connected to the electrode terminal <NUM>.

The pair of clamping members <NUM> mounted on the body <NUM> can clamp the busbar <NUM>, so that the body <NUM> can be fastened to the busbar <NUM>, thereby ensuring stable connection between the voltage sampling member <NUM> and the electrode terminal <NUM>.

After the sample testing is completed, the clamping members <NUM> can release the busbar <NUM>, and then the base <NUM> can be detached from the busbar <NUM> connected to the tested battery cell <NUM>, and then moved to the busbar <NUM> connected to another battery cell <NUM> that needs to be tested. The clamping members <NUM> can clamp the new busbar <NUM>, so that the base <NUM> is fastened to the new busbar <NUM>, allowing the voltage sampling member <NUM> to pass through the through hole <NUM> to test the new battery cell <NUM>.

The base <NUM> can be reused in the testing process of multiple sample battery cells <NUM> through the characteristic of detachably mounting of the clamping member <NUM> to the busbar <NUM>. This can reduce the number of bases <NUM> required for positioning the voltage sampling member <NUM> in the testing process, avoid waste of materials, reduce the production cost of the battery cells <NUM>, improve the cost performance of batteries, and facilitate the promotion of batteries.

The clamping member <NUM> can be connected to the body <NUM> via a bolt. Through rotation of the bolt, the clamping member <NUM> is controlled to clamp the busbar <NUM>. Alternatively, the clamping members <NUM> can be movably disposed on the body <NUM>, and the clamping members <NUM> are connected to each other via a screw. Through rotation of the screw, distance between a pair of clamping members <NUM> is controlled so as to clamp the busbar <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG>, a pair of clamping members <NUM> is provided on two opposite sides of the body <NUM> along a first direction X, the first direction X being perpendicular to an axial direction of the through hole <NUM>.

The pair of clamping members <NUM> can be disposed on two opposite sides of the body <NUM>. When the pair of clamping members <NUM> is attached to the busbar <NUM>, in order to clamp the busbar <NUM>, the direction of the force from the clamping members <NUM> on the busbar <NUM> always passes through the axis of the positioning hole <NUM>, so that the direction of the reaction force from the clamping members <NUM> on the base <NUM> can always pass through the axis of the through hole <NUM>, and the body <NUM> can maintain force balance on the busbar <NUM>, to ensure relative fixation of the body <NUM> and the busbar <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG>, one clamping member in the pair of clamping members <NUM> is rotatably mounted to the body <NUM> around a first axis a, and the other is rotatably mounted to the body <NUM> around a second axis b, the first axis a and the second axis b being parallel.

The first axis a and the second axis b are the center lines around which the pair of clamping members <NUM> rotate.

The pair of clamping members <NUM> can be rotatably mounted on the body <NUM>. When the pair of clamping members <NUM> rotate to get close to the busbar <NUM>, the first axis a is parallel to the second axis b. When the clamping members <NUM> clamp the busbar <NUM>, the directions of the forces of the pair of clamping members <NUM> on the busbar <NUM> can be parallel, and the forces from the pair of clamping members <NUM> on the busbar <NUM> can be mutually offset, thus ensuring that the clamping members <NUM> can stably clamp the busbar <NUM>.

The clamping member <NUM> can be rotatably disposed on the body <NUM> via a fastening pin <NUM> (or a rotating shaft, a bearing, or the like), and the pair of clamping members <NUM> synchronously gets close to the busbar <NUM> by rotation to clamp the busbar <NUM>.

According to some embodiments of this application, optionally, still referring to <FIG>, the first axis a and the second axis b extend along a second direction Y, where the second direction Y is perpendicular to the first direction X and perpendicular to the axial direction of the through hole <NUM>.

A flipping range of the clamping member <NUM> can be limited to the plane in which the first direction X and the axial direction of the through hole <NUM> lie, and the forces of the pair of clamping members <NUM> on the busbar <NUM> can steadily offset each other, so that the busbar <NUM> can maintain force balance.

According to the invention, as shown in <FIG> and <FIG>, the base <NUM> further includes an elastic member <NUM>, where the elastic member <NUM> connects the body <NUM> and the clamping member <NUM>, and the elastic member <NUM> is configured to provide clamping force.

The elastic member <NUM> is a member having an elastic effect. For example, the elastic member may be a spring, or the material of the elastic member <NUM> may be but is not limited to resin, silicone, engineering plastic, or the like.

The elastic member <NUM> is connected between the body <NUM> and the clamping member <NUM>, and the elastic member <NUM> is kept in a compressed state and continuously uses its own elasticity to pull or push the clamping member <NUM> close to the busbar <NUM>. The elasticity of the elastic member <NUM> provides clamping force for the clamping member <NUM> to clamp the busbar <NUM>, so that the base <NUM> can be fastened to the busbar <NUM>.

The elastic member <NUM> can adjust its length based on the reaction force from the busbar <NUM> on the clamping member <NUM>, and the force of the clamping member <NUM> on the busbar <NUM> changes accordingly to prevent the busbar <NUM> from being crushed and broken.

According to some embodiments of this application, optionally, as shown in <FIG>, the body <NUM> has a first surface <NUM> and a second surface <NUM> opposite each other in the axial direction of the through hole <NUM>, and the clamping member <NUM> includes a clamping end <NUM> for clamping the busbar <NUM> and an operating end <NUM> for manual operation, where the clamping end <NUM> protrudes from the first surface <NUM>.

The first surface <NUM> is a surface of the body <NUM> close to the busbar <NUM>, and the second surface <NUM> is a surface of the body <NUM> back away from the busbar <NUM>.

The clamping end <NUM> of the clamping member <NUM> protrudes from the first surface <NUM>, the clamping end <NUM> is close to the busbar <NUM>, and the busbar <NUM> is clamped between the clamping ends <NUM> of the pair of clamping members <NUM> and the first surface <NUM>. The base <NUM> gets close to the busbar <NUM> from three directions, so as to enlarge the contact surface between the base <NUM> and the busbar <NUM> and improve the connection stability between the base <NUM> and the busbar <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG> and <FIG>, the clamping end <NUM> is provided with a snap hook portion <NUM> for snap hooking on an edge of the busbar <NUM>.

The snap hook portion <NUM> is a convex portion that protrudes from the clamping end <NUM> and that can hold the surface of the busbar <NUM> close to the electrode terminal <NUM>.

When the clamping member <NUM> clamps the busbar <NUM>, the snap hook portion <NUM> can hold the surface of the busbar <NUM> back away from the first surface <NUM>. The busbar <NUM> is clamped between the clamping ends <NUM> of the pair of clamping members <NUM>, the first surface <NUM>, and the snap hook portion <NUM>. The base <NUM> gets close to and fastens itself to the busbar <NUM> from four directions, which further increases the contact area between the base <NUM> and the busbar <NUM> and improves the connection stability between the base <NUM> and the busbar <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG> and <FIG>, the clamping end <NUM> is provided with at least two snap hook portions <NUM>, and the at least two snap hook portions <NUM> are spaced apart in a second direction Y, where the second direction Y is perpendicular to the first direction X and perpendicular to the axial direction of the through hole <NUM>.

A gap is present between adjacent snap hook portions <NUM>, so as to avoid the electrode terminal <NUM>, thereby protecting the electrode terminal <NUM> from interference of the snap hook portions <NUM>.

The gap between adjacent snap hook portions <NUM> may be greater than or equal to a diameter of the electrode terminal <NUM>. Alternatively, when there is a gap between an outer peripheral surface of the electrode terminal <NUM> and an edge of the busbar <NUM> in the first direction, the gap between the adjacent snap hook portions <NUM> may be smaller than the diameter of the electrode terminal <NUM>, so that the snap hook portions <NUM> avoid the electrode terminal <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG>, the operating end <NUM> protrudes from the second surface <NUM>.

The operating end <NUM> of the clamping member <NUM> protrudes from the second surface <NUM>, so that a user can grasp, push, and pull the clamping member <NUM> without interfering with the body <NUM>, simplifying the mounting, unmounting, and movement processes of the base <NUM> and making it easier to use.

For example, the operating end <NUM> of the clamping member <NUM> can be folded in a direction facing away from the body <NUM> to form a bent edge, so that the user can grasp the bent edge to push the clamping member <NUM> to rotate, making it easier to use the base <NUM>.

According to some embodiments of this application, optionally, as shown in <FIG> and <FIG>, a limiting protrusion <NUM> is formed around the through hole <NUM> on the first surface <NUM>, and the limiting protrusion <NUM> is configured to be inserted into the positioning hole <NUM> of the busbar <NUM>.

The limiting protrusion <NUM> is a circular protrusion structure coaxially disposed with the through hole <NUM>.

The limiting protrusion <NUM> fits into the positioning hole <NUM> of the busbar <NUM>, so that the through hole <NUM> can be coaxially disposed with the positioning hole <NUM> of the busbar <NUM>, and the voltage sampling member <NUM> can accurately pass through the positioning hole <NUM> to connect to the electrode terminal <NUM> by passing through the through hole <NUM>. This can reduce the time for positioning the electrode terminal <NUM> in the process of connecting the voltage sampling member <NUM> to the electrode terminal <NUM>, thereby improving the testing efficiency of the battery cell <NUM>.

Further, the outer peripheral surface of the limiting protrusion <NUM> can be attached to the wall of the hole of the positioning hole <NUM>, so that the positioning hole <NUM> can limit the limiting protrusion <NUM>, thereby enhancing the positioning effect between the body <NUM> and the busbar <NUM>.

According to some embodiments of this application, optionally, both the body <NUM> and the clamping member <NUM> are made of an insulating material.

The insulating material is a material that does not conduct electricity at an allowable voltage. The material of the body <NUM> and the clamping member <NUM> may be but is not limited to ceramic, PEEK material (polyether ether ketone), PU material (polyurethane), PAEK material (polyaryl ether ketone), and the like.

The body <NUM> and the clamping member <NUM> may be made of an insulating material, so as to prevent contact between different bases <NUM> from causing short circuit due to overlap of positive and negative electrodes of the battery cell <NUM>.

Further, both the body <NUM> and the clamping member <NUM> are made of high temperature resistant material.

Currents flow through the busbar <NUM>, causing the surface temperature of the busbar <NUM> to rise. The body <NUM> and the clamping member <NUM> can be made of high temperature resistant material to prevent the body <NUM> and the clamping member <NUM> from being damaged due to high temperature of the busbar <NUM>.

According to some embodiments of this application, this application further provides a voltage sampling assembly. As shown in <FIG> and <FIG>, the voltage sampling assembly includes the foregoing base <NUM> and a voltage sampling member <NUM>, where the voltage sampling member <NUM> is threaded through the through hole <NUM>.

The voltage sampling member <NUM> is a voltage sampling needle (or an electroprobe, or the like) connected to the electrode terminal <NUM> to obtain voltage.

According to some embodiments of this application, optionally, as shown in <FIG>, the through hole <NUM> is provided with internal threads on the inner wall, and the voltage sampling member <NUM> is provided with external threads matching the internal threads.

The voltage sampling member <NUM> passes through the through hole <NUM> and is fastened in the through hole <NUM> by threading its external threads with the internal threads of the through hole <NUM>. The body <NUM> is fastened to the busbar <NUM> via the clamping member <NUM>, and the through hole <NUM> faces the electrode terminal <NUM>. This improves the connection stability between the voltage sampling member <NUM> and the electrode terminal <NUM>.

According to some embodiments of this application, this application further provides a voltage testing apparatus including a processing module and two foregoing voltage sampling assemblies, where voltage sampling members <NUM> of the two voltage sampling assemblies are all electrically connected to the processing module.

The processing module is a module that calculates the battery capacity according to voltage (V)/load resistance (R) × discharge time (h) = battery capacity (Ah) after the voltage, load resistance, and discharge time of the battery cell <NUM> are obtained.

During the testing of the battery cell <NUM>, the electrode terminal <NUM> of the battery cell <NUM> is connected to a charge/discharge machine via the busbar <NUM>. The current output from the battery cell <NUM> is transmitted to the charge/discharge machine only through the busbar <NUM>, and the charge/discharge machine controls the current flowing through the busbar <NUM> to be a stable constant current.

It should be noted that internal resistance of the charge/discharge machine is the load resistance of the battery cell <NUM>.

The voltage sampling assembly is connected to the positive and negative terminals of the battery cell <NUM> via the voltage sampling member <NUM> to collect the output voltage of the battery cell <NUM>, and can record the operation duration of the battery. The voltage, operation duration of the battery cell <NUM>, and internal resistance of the charge/discharge machine collected by the voltage sampling assembly are transmitted to the processing module. The processing module processes the data to calculate the battery capacity of the battery cell <NUM> and obtain the test results of the battery cell <NUM>, so as to determine whether the battery cell <NUM> is qualified.

According to some embodiments of this application, this application provides a base <NUM>, as shown in <FIG>, including a body, a pair of clamping members <NUM>, and an elastic member <NUM>. The body is provided with a through hole <NUM> for the voltage sampling member <NUM> to run through. The pair of clamping members <NUM> are disposed opposite each other on the body. The clamping members <NUM> are rotatably disposed on the body. The elastic member <NUM> is connected between the clamping members <NUM> and the body <NUM>, so as to provide a clamping force for the clamping member <NUM> to push the pair of clamping members <NUM> to get close to and clamp the busbar <NUM>, so that the base <NUM> is fastened to the busbar <NUM>, facilitating electrical connection between the voltage assembly and the electrode terminal <NUM>. The pair of clamping members <NUM> can be rotated to move away from the busbar <NUM> to allow the base <NUM> to be detached from the busbar <NUM>. The pair of clamping members <NUM> can be rotated to get close to a new busbar <NUM> and clamp the new busbar <NUM>, so that the base <NUM> can be mounted to the new busbar <NUM> to facilitate battery capacity testing. The base <NUM> can be reused in battery capacity testing. This can reduce the replacement frequency of the base <NUM> as compared to the existing battery capacity testing process, reduce the production cost of batteries, improve the cost performance of batteries, and facilitate the promotion of batteries.

Claim 1:
A base (<NUM>), configured for mounting a voltage sampling member (<NUM>) for voltage sampling of a battery cell (<NUM>), wherein the base (<NUM>) comprises:
a body (<NUM>), provided with a through hole (<NUM>) for the voltage sampling member (<NUM>) to run through; and
a pair of clamping members (<NUM>), mounted to the body (<NUM>) for clamping a busbar (<NUM>) connected to the battery cell (<NUM>), characterized by
an elastic member (<NUM>), connecting the body (<NUM>) and the clamping members (<NUM>) for providing clamping force.