Hot pressing device

Abstract

The utility model relates to the technical field of battery cell processing, and discloses a hot pressing device, which comprises a first hot pressing plate, a second hot pressing plate, a driving module and at least two resistance test pieces, the first hot pressing plate and the second hot pressing plate are oppositely arranged along a first direction, the driving module is connected with the first hot pressing plate, and the resistance test pieces are connected with the driving module. The resistance test pieces are fixedly arranged on the second hot pressing plate, every two resistance test pieces are matched with each other, one resistance test piece is used for being in contact with a positive lug of a battery cell, and the other resistance test piece is used for being in contact with a negative lug of the battery cell. The second hot pressing plate is fixedly arranged, when the hot pressing device carries out pressure shaping on the battery cell, the battery cell is placed on the second hot pressing plate, the driving module drives the first hot pressing plate to press the battery cell on the second hot pressing plate, and the resistance test piece is fixedly arranged on the second hot pressing plate, so that the resistance test piece does not move along with the movement of the first hot pressing plate; and the test connecting line of the resistance test piece is not likely to be pulled off, so that the normal operation of the resistance test work of the battery core can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core processing, in particular to a hot pressing device. Background Art

[0002] The hot pressing process is one of the processes in lithium battery forming. In this process, the hot pressing device performs pressure shaping and resistance testing on the soft battery cells according to the process requirements. In the related technology, the hot pressing device includes an upper hot pressing plate, a lower hot pressing plate and a resistance testing piece. The upper hot pressing plate moves toward the lower hot pressing plate to squeeze the soft battery cells with the lower hot pressing plate to perform pressure shaping on the battery cells. The resistance testing piece is integrated on the upper hot pressing plate. The resistance testing piece moves with the upper hot pressing plate to contact the battery cell's tab to perform resistance testing on the battery cell. In this structure of the hot pressing device, the resistance testing piece is used when testing the battery cell resistance. The test connection line of the resistance test piece will also move with the upper hot pressing plate. Therefore, the test connection line needs to be of sufficient length to avoid being pulled during the movement, and the hot pressing device needs to reserve sufficient movable space for the test connection line to move, so as to avoid the test connection line interfering with other components and causing the test connection line to be pulled. This results in that the assembly requirements of the hot pressing device are relatively high and it is not easy to assemble. If the hot pressing device is improperly assembled, then there is a possibility that the test connection line will be pulled off during the normal operation of the hot pressing device, and the normal progress of the battery cell resistance test cannot be guaranteed. Utility Model Content

[0003] The primary purpose of the utility model is to provide a heat pressing device which is easy to assemble and can ensure the normal conduction of the cell resistance test during normal operation.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a hot pressing device for pressure shaping and resistance testing of battery cells, the hot pressing device has a first direction, including a first hot pressing plate, a second hot pressing plate, a driving module and a resistance testing piece, the first hot pressing plate and the second hot pressing plate are arranged relatively to each other along the first direction, the second hot pressing plate is used to support the battery cell on the side facing the first hot pressing plate, the driving module is connected to the first hot pressing plate, the driving module is used to drive the first hot pressing plate to move toward the second hot pressing plate along the first direction so that the first hot pressing plate and the second hot pressing plate squeeze the battery cell, the resistance testing piece is provided with at least two, each of the resistance testing pieces is fixedly arranged on the second hot pressing plate, the resistance testing pieces cooperate with each other, and one of them is used to contact the positive pole ear of the battery cell, and the other is used to contact the negative pole ear of the battery cell.

[0005] In a specific embodiment of the utility model, a mounting groove is provided on the side of the second hot pressing plate facing the first hot pressing plate, and at least two mounting grooves are provided, one of which is installed with a resistance test piece. In the first direction, the depth of the mounting groove is H mm, and the height of the resistance test piece is L mm, satisfying: H≤L.

[0006] In a specific embodiment of the utility model, the heat pressing device further has a second direction intersecting with the first direction;

[0007] The two resistance test pieces that cooperate with each other are arranged at intervals along the second direction.

[0008] In a specific embodiment of the utility model, two of the mounting grooves form a group, and the two resistance test pieces that cooperate with each other are respectively installed in the two mounting grooves in the single group of mounting grooves. In the second direction, the second hot pressing plate is provided with a group of mounting grooves, and the mounting grooves extend along the second direction. The ends of the two mounting grooves that are far away from each other are both open ends located on the side of the second hot pressing plate.

[0009] The resistance testing piece includes a first plate body and a second plate body, the second plate body is connected to one end of the first plate body in the second direction, the first plate body is inserted into the mounting groove, the second plate body is in contact with the side of the second hot pressing plate, and in the first direction, the height of the first plate body is L mm.

[0010] In a specific embodiment of the utility model, the hot pressing device further includes a third direction, and the first direction, the second direction and the third direction intersect each other;

[0011] The groove side wall of the installation groove in the third direction is provided with a limiting groove, the limiting groove extends along the second direction, and one end of the limiting groove in the second direction is an open end located on the side of the second hot pressing plate;

[0012] The resistance testing piece further includes a limiting rod, the limiting rod is provided at the end of the first plate body in the third direction, the length direction of the limiting rod is parallel to the second direction, and the limiting rod is inserted into the limiting groove.

[0013] In a specific embodiment of the present invention, the resistance test piece further includes a test connection line, and the test connection line is connected to the side of the second plate body facing away from the second hot pressing plate.

[0014] In a specific embodiment of the utility model, the hot pressing device also includes a smoothing plate, a connecting piece and an elastic piece, the connecting piece is arranged on the first hot pressing plate and can be moved in the first direction, the smoothing plate is located on the side of the first hot pressing plate close to the second hot pressing plate, and the smoothing plate is connected to the connecting piece, the smoothing plate is used to press the positive ear and the negative ear onto the resistance testing piece, the elastic piece is arranged between the smoothing plate and the first hot pressing plate, and the two ends of the elastic piece in the first direction are respectively in contact with the smoothing plate and the first hot pressing plate.

[0015] In a specific embodiment of the utility model, the first hot pressing plate is provided with a mounting hole penetrating along the first direction;

[0016] The connecting member includes a connecting column and a limiting protrusion, the connecting column passes through the mounting hole, one end of the connecting column along its length direction is connected to the smoothing plate, and the limiting protrusion is arranged on the outer peripheral wall of the connecting column and contacts the side of the first hot pressing plate facing away from the second hot pressing plate.

[0017] In a specific embodiment of the utility model, the elastic member is a spring, the spring is sleeved on the connecting column, and one end of the spring along its length direction is in contact with the smoothing platen, and the other end is in contact with the first hot pressing platen.

[0018] In a specific embodiment of the utility model, the driving module includes a fixed plate, a guide column and a driving source, the fixed plate is arranged on a side of the first hot pressing plate away from the second hot pressing plate, the fixed plate is provided with a guide hole penetrating along the first direction, the guide column passes through the guide hole, and one end of the guide column along the first direction is connected to the first hot pressing plate, the driving source is fixedly arranged on the fixed plate, and the power output end of the driving source is connected to the first hot pressing plate.

[0019] The utility model provides a hot pressing device, which has the following beneficial effects compared with the prior art:

[0020] The utility model provides a hot pressing device, in which when pressure shaping is performed on a battery cell, the battery cell is placed on a second hot pressing plate, and the driving module drives the first hot pressing plate to press the battery cell onto the second hot pressing plate, while a resistance test piece is fixedly arranged on the second hot pressing plate, thereby the resistance test piece will not move along with the movement of the first hot pressing plate, and the test connection line of the resistance test piece will not be pulled off, thereby ensuring the normal performance of the battery cell resistance test; and since the resistance test piece is fixedly arranged, there is no need to consider the problem of the test connection line of the resistance test piece being pulled off during operation when assembling the hot pressing device, thereby making the hot pressing device easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a hot pressing device according to an embodiment of the utility model;

[0022] Figure 2 It is a structural diagram of the hot pressing device when the first hot pressing plate and the second hot pressing plate of the embodiment of the utility model are pressing the battery core;

[0023] Figure 3 It is an exploded schematic diagram of the driving module and the first hot pressing plate of an embodiment of the utility model;

[0024] Figure 4 It is an exploded schematic diagram of the second hot pressing plate and the resistance test piece of the embodiment of the utility model;

[0025] Figure 5 This utility model embodiment Figure 4 A magnified view of center A;

[0026] Figure 6 It is a schematic diagram of the coordination of the smoothing plate, the battery cell and the resistance test piece in the embodiment of the utility model;

[0027] Figure 7 It is a structural diagram of a resistance test piece according to an embodiment of the utility model;

[0028] Figure 8 It is a structural diagram of a battery cell according to an embodiment of the utility model.

[0029] In the figure, Z is the first direction; Y is the second direction; X is the third direction; 1. The first hot pressing plate; 101 is the mounting hole; 2. The second hot pressing plate; 201 is the mounting slot; 202 is the limiting slot; 3. The driving module; 31. The fixing plate; 310 is the guide hole; 32 is the guide column; 33 is the driving source; 4. The resistance test piece; 41 is the first plate body; 42 is the second plate body; 43 is the limiting rod; 44 is the test connection line; 5. The battery cell; 501 is the positive ear; 502 is the negative ear; 6. The smoothing plate; 7. The connecting piece; 71 is the connecting column; 72 is the limiting protrusion; 8. The elastic piece. DETAILED DESCRIPTION

[0030] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the application examples, "parallel" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means that the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance, equal angle or equal area means that the tolerance range is -1% to 1%.

[0035] like Figure 1-8As shown, a hot pressing device of a preferred embodiment of the utility model embodiment is used for pressure shaping and resistance testing of a battery cell 5, the hot pressing device has a first direction Z, a second direction Y and a third direction X which are perpendicular to each other, and the hot pressing device includes a first hot pressing plate 1, a second hot pressing plate 2, a driving module 3 and a resistance testing piece 4, the first hot pressing plate 1 and the second hot pressing plate 2 are arranged relatively to each other along the first direction Z, the second hot pressing plate 2 is used to carry the battery cell 5 on the side facing the first hot pressing plate 1, the driving module 3 is connected to the first hot pressing plate 1, the driving module 3 is used to drive the first hot pressing plate 1 to move toward the second hot pressing plate 2 along the first direction Z, so that the first hot pressing plate 1 and the second hot pressing plate 2 squeeze the battery cell 5, two resistance testing pieces 4 are provided, each resistance testing piece 4 is fixedly arranged on the second hot pressing plate 2, one of the resistance testing pieces 4 is used to contact with the positive ear 501 of the battery cell 5, and the other is used to contact with the negative ear 502 of the battery cell 5.

[0036] In actual application, the second hot pressing plate 2 is fixedly arranged. When the hot pressing device performs pressure shaping on the battery cell 5, the battery cell 5 is placed on the second hot pressing plate 2, and the driving module 3 drives the first hot pressing plate 1 to press the battery cell 5 onto the second hot pressing plate 2, and the resistance testing piece 4 is fixedly arranged on the second hot pressing plate 2. Therefore, the resistance testing piece 4 will not move with the movement of the first hot pressing plate 1, and the test connection line 44 of the resistance testing piece 4 will not be pulled off, which can ensure the normal performance of the resistance test of the battery cell 5. Since the resistance testing piece 4 is fixedly arranged, there is no need to consider the problem of the test connection line 44 of the resistance testing piece 4 being pulled off during work when assembling the hot pressing device, so that the hot pressing device has the characteristic of easy assembly.

[0037] In other embodiments, multiple resistance test pieces 4 can be provided, the number of which is an even number, and the resistance test pieces 4 are matched in pairs, and among the resistance test pieces 4 matched in pairs, one of them is used to contact the positive pole ear 501 of the battery cell 5, and the other is used to contact the negative pole ear 502 of the battery cell 5. Thus, the hot pressing device can perform pressure shaping and resistance testing on multiple battery cells 5 at the same time; in actual applications, the number of resistance test pieces 4 is set according to actual applications, and the utility model does not impose any restrictions on this.

[0038] like Figure 4 and Figure 5As shown, the second hot pressing plate 2 is provided with a mounting groove 201 on the side facing the first hot pressing plate 1, and there are two mounting grooves 201. A resistor test piece 4 is installed in one mounting groove 201. In the first direction Z, the depth of the mounting groove 201 is H mm, and the height of the resistor test piece 4 is L mm, satisfying: H≤L, that is, one end of the resistor test piece 4 facing the first hot pressing plate 1 is exposed outside the mounting groove 201. Therefore, when the resistance test of the battery cell 5 is performed, it can be ensured that the positive ear 501 and the negative ear 502 of the battery cell 5 can contact the resistor test piece 4, so that the resistance test work can be carried out normally. The height of the resistor test piece 4 exposed outside the mounting groove 201 is set according to the distance between the ear and the second hot pressing plate 2 when the battery cell 5 is placed on the second hot pressing plate 2, and the utility model does not limit this. As a specific implementation of this embodiment, one end of the resistor test piece 4 facing the first hot pressing plate 1 is flush with the plane where the notch of the mounting groove 201 is located, that is, H=L.

[0039] The resistor test piece 4 is installed through the installation groove 201, and the installation groove 201 can limit the position of the resistor test piece 4, and the installation stability of the resistor test piece 4 is relatively high; moreover, based on the setting of the installation groove 201, the resistor test piece 4 is partially embedded in the second hot pressing plate 2, thereby making the structure of the hot pressing device more compact. In other embodiments, the resistor test piece 4 can be fixed on the side of the second hot pressing plate 2 facing the first hot pressing plate 1 by a fixing member, thereby also realizing the fixed setting of the resistor test piece 4, and the utility model does not limit this.

[0040] Specifically, when the number of resistance test pieces 4 is multiple, the number of installation slots 201 is also multiple, and one installation slot 201 is installed with one resistance test piece 4. At this time, two installation slots 201 are a group, and the two resistance test pieces 4 that cooperate with each other are respectively installed in the two installation slots 201 in the single group of installation slots 201.

[0041] In this embodiment, the hot pressing device is suitable for Figure 8 The battery cell 5 of the structure shown in the figure has a positive electrode ear 501 and a negative electrode ear 502 located on the same side. Figure 1 and Figure 4As shown, the two resistance test pieces 4 are arranged at intervals along the second direction Y. At this time, in the second direction Y, the second hot pressing plate 2 is provided with a group of mounting grooves 201, and the mounting grooves 201 extend along the second direction Y. The extension lengths of the two mounting grooves 201 are the same, and the two mounting grooves 201 are symmetrical about the central side of the second hot pressing plate 2, and the ends of the two mounting grooves 201 that are away from each other are both open ends located on the side of the second hot pressing plate 2; the resistance test piece 4 includes a first plate body 41 and a second plate body 42, the second plate body 42 is connected to one end of the first plate body 41 in the second direction Y, the first plate body 41 is inserted into the mounting groove 201 from the open end of the mounting groove 201, the first plate body 41 is used to contact the pole ear of the battery cell 5 to realize the resistance test, and the second plate body 42 is in contact with the side of the second hot pressing plate 2, and in the first direction Z, the height of the first plate body 41 is L mm; specifically, the first plate body 41 is embedded in the installation groove 201, and the first plate body 41 has a certain length in the second direction Y. Therefore, when the battery cell 5 is placed on the second hot pressing plate 2, the positive electrode ear 501 and the negative electrode ear 502 of the battery cell 5 can be more easily contacted with the corresponding first plate body 41, and there is no strict requirement for the placement position of the battery cell 5, and the placement of the battery cell 5 can be more flexible; in actual applications, in the second direction Y, the length of the first plate body 41 is half the length of the battery cell 5.

[0042] In addition, the distance between the positive ear 501 and the negative ear 502 of different types of battery cells 5 is different. The resistance testing piece 4 of the above structure in this embodiment has a certain length in the second direction Y. Therefore, the resistance testing piece 4 is suitable for resistance testing of different types of battery cells 5, and the hot pressing device has a wide range of application.

[0043] When installing the resistance test piece 4 into the installation groove 201, the second plate body 42 can be used as a grasping portion, that is, during assembly, the operator can hold the second plate body 42 and then insert the first plate body 41 into the installation groove 201. When the second plate body 42 contacts the side of the second hot pressing plate 2, it indicates that the first plate body 41 is installed in place, which can make the assembly operation easier.

[0044] like Figure 5 and Figure 7As shown, a limiting groove 202 is provided on the groove side wall of the installation groove 201 in the third direction X, and the limiting groove 202 extends along the second direction Y, and one end of the limiting groove 202 in the second direction Y is an open end located on the side of the second hot pressing plate 2; the resistance test piece 4 also includes a limiting rod 43, and a limiting rod 43 is provided at the end of the first plate body 41 in the third direction X, and the length direction of the limiting rod 43 is parallel to the second direction Y, and the limiting rod 43 is inserted into the limiting groove 202; specifically, the first plate body 41 is tightly matched with the installation groove 201, and the limiting rod 43 is matched with the limiting groove 202, and the limiting rod 43 can limit the freedom of the first plate body 41 in the first direction Z, so that the first plate body 41 is stably arranged on the second hot pressing plate 2, thereby, the first plate body 41 does not need to be fixed by fasteners, and the assembly is simple.

[0045] like Figure 7 As shown, the resistance test piece 4 also includes a test connection line 44, which is connected to the side of the second plate body 42 facing away from the second hot pressing plate 2. The second plate body 42 is located on one side of the second hot pressing plate 2. The test connection line 44 is connected to the second plate body 42. The structure is simple and easy to assemble. In actual applications, the other end of the test connection line 44 is connected to the test equipment.

[0046] like Figure 1 , Figure 2 and Figure 6 As shown, the hot pressing device also includes a smoothing plate 6, a connecting member 7 and an elastic member 8. The connecting member 7 is arranged on the first hot pressing plate 1 and can move in the first direction Z. The smoothing plate 6 is located on the side of the first hot pressing plate 1 close to the second hot pressing plate 2, and the smoothing plate 6 is connected to the connecting member 7. The smoothing plate 6 is used to press the positive ear 501 and the negative ear 502 on the resistance test piece 4. The elastic member 8 is arranged between the smoothing plate 6 and the first hot pressing plate 1, and the two ends of the elastic member 8 in the first direction Z are respectively connected to the smoothing plate Plate 6 is in contact with the first hot pressing plate 1; specifically, the setting of the smoothing plate 6 can not only make the positive ear 501 and the negative ear 502 effectively contact with the resistance testing piece 4, but also flatten the positive ear 501 and the negative ear 502; and the function of the elastic member 8 is to realize the flexible connection between the smoothing plate 6 and the first hot pressing plate 1. The elastic member 8 has a buffering property. When the smoothing plate 6 contacts the positive ear 501 and the negative ear 502, it buffers upward to avoid the smoothing plate 6 from crushing the positive ear 501 and the negative ear 502.

[0047] In this embodiment, if Figure 1 and Figure 6As shown, there is one smoothing plate 6, which presses the positive ear 501 and the negative ear 502 of the battery cell 5 at the same time, so as to press the positive ear 501 and the negative ear 502 respectively onto the corresponding resistance test piece 4, with a simple structure and convenient installation; in other embodiments, two smoothing plates 6 can be provided, and the two smoothing plates 6 correspond to the positive ear 501 and the negative ear 502 of the battery cell 5 respectively, which can also make the positive ear 501 and the negative ear 502 effectively contact with the resistance test piece 4, and flatten the positive ear 501 and the negative ear 502.

[0048] like Figure 3 As shown, the first hot pressing plate 1 is provided with a mounting hole 101 penetrating along the first direction Z; Figure 6 As shown, the connecting member 7 includes a connecting column 71 and a limiting protrusion 72. Figure 2 As shown, the connecting column 71 passes through the mounting hole 101, and one end of the connecting column 71 along its length direction is connected to the smoothing plate 6. The limiting protrusion 72 is arranged on the outer peripheral wall of the connecting column 71 and contacts the side of the first hot pressing plate 1 facing away from the second hot pressing plate 2. Specifically, the connecting member 7 of this structure has a simple structure and is arranged along the first direction Z with the smoothing plate 6, which can make the structure of the hot pressing device more compact.

[0049] The elastic member 8 is a spring, which is sleeved on the connecting column 71, and one end of the spring along its length direction is in contact with the smoothing plate 6, and the other end is in contact with the first hot pressing plate 1. The spring has a simple structure, and it is easy to install when sleeved on the connecting column 71, and the connection stability is high. In other embodiments, the elastic member 8 can also be rubber, etc., and the utility model does not limit this.

[0050] In this embodiment, if Figure 2 As shown, the driving module 3 includes a fixed plate 31, a guide column 32 and a driving source 33. The fixed plate 31 is arranged on a side of the first hot pressing plate 1 away from the second hot pressing plate 2. The fixed plate 31 is provided with a guide hole 310 passing through along the first direction Z. The guide column 32 passes through the guide hole 310, and one end of the guide column 32 along the first direction Z is connected to the first hot pressing plate 1. The driving source 33 is fixedly arranged on the fixed plate 31, and the power output end of the driving source 33 is connected to the first hot pressing plate 1. In actual application, the fixed plate 31 is fixedly arranged, and the driving source 33 drives the first hot pressing plate 1 to move toward the second hot pressing plate 2, thereby realizing the pressure shaping and resistance testing of the battery cell 5. The setting of the guide column 32 plays a guiding role, which can make the movement of the first hot pressing plate 1 more stable.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A hot pressing device for pressure shaping and resistance testing of a battery cell (5), the hot pressing device having a first direction (Z), characterized in that: The invention comprises a first hot pressing plate (1), a second hot pressing plate (2), a driving module (3) and a resistance test piece (4); the first hot pressing plate (1) and the second hot pressing plate (2) are arranged opposite to each other along the first direction (Z); the second hot pressing plate (2) faces the side of the first hot pressing plate (1) and is used to carry the battery cell (5); the driving module (3) is connected to the first hot pressing plate (1); the driving module (3) is used to drive the first hot pressing plate (1) to move along the first direction (Z) toward the second hot pressing plate (2) so that the first hot pressing plate (1) and the second hot pressing plate (2) squeeze the battery cell (5); at least two resistance test pieces (4) are provided, each of which is fixedly arranged on the second hot pressing plate (2); the resistance test pieces (4) cooperate with each other, and one of them is used to contact the positive pole ear (501) of the battery cell (5), and the other is used to contact the negative pole ear (502) of the battery cell (5).

2. The hot pressing device according to claim 1, characterized in that: The second hot pressing plate (2) is provided with a mounting groove (201) on the side facing the first hot pressing plate (1), and at least two mounting grooves (201) are provided, and one of the mounting grooves (201) is installed with one of the resistance test pieces (4). In the first direction (Z), the depth of the mounting groove (201) is H mm, and the height of the resistance test piece (4) is L mm, satisfying: H≤L.

3. The hot pressing device according to claim 2, characterized in that: The hot pressing device also has a second direction (Y) intersecting the first direction (Z); The two resistance test pieces (4) that cooperate with each other are arranged at intervals along the second direction (Y).

4. The hot pressing device according to claim 3, characterized in that: The two mounting grooves (201) form a group, and the two resistance test pieces (4) that cooperate with each other are respectively installed in the two mounting grooves (201) in the single group of mounting grooves (201). In the second direction (Y), the second hot pressing plate (2) is provided with a group of mounting grooves (201), and the mounting grooves (201) extend along the second direction (Y). The ends of the two mounting grooves (201) that are away from each other are both open ends located on the side of the second hot pressing plate (2); The resistance testing piece (4) comprises a first plate body (41) and a second plate body (42), wherein the second plate body (42) is connected to one end of the first plate body (41) in the second direction (Y), the first plate body (41) is inserted into the mounting groove (201), the second plate body (42) is in contact with the side surface of the second hot pressing plate (2), and in the first direction (Z), the height of the first plate body (41) is L mm.

5. The hot pressing device according to claim 4, characterized in that: The hot pressing device further includes a third direction (X), and the first direction (Z), the second direction (Y) and the third direction (X) intersect each other; A limiting groove (202) is provided on the groove side wall of the installation groove (201) in the third direction (X), the limiting groove (202) extends along the second direction (Y), and one end of the limiting groove (202) in the second direction (Y) is an open end located on the side of the second hot pressing plate (2); The resistance test piece (4) further comprises a limiting rod (43), the limiting rod (43) being provided at the end of the first plate body (41) in the third direction (X), the length direction of the limiting rod (43) being parallel to the second direction (Y), and the limiting rod (43) being inserted into the limiting groove (202).

6. The hot pressing device according to claim 4, characterized in that: The resistance testing piece (4) further comprises a testing connection line (44), wherein the testing connection line (44) is connected to the side surface of the second plate body (42) facing away from the second hot pressing plate (2).

7. The hot pressing device according to claim 1, characterized in that: The hot pressing device also includes a smoothing plate (6), a connecting piece (7) and an elastic piece (8), wherein the connecting piece (7) is arranged on the first hot pressing plate (1) and can move in the first direction (Z), the smoothing plate (6) is located on the side of the first hot pressing plate (1) close to the second hot pressing plate (2), and the smoothing plate (6) is connected to the connecting piece (7), the smoothing plate (6) is used to press the positive electrode ear (501) and the negative electrode ear (502) onto the resistance testing piece (4), the elastic piece (8) is arranged between the smoothing plate (6) and the first hot pressing plate (1), and the two ends of the elastic piece (8) in the first direction (Z) are in contact with the smoothing plate (6) and the first hot pressing plate (1) respectively.

8. The hot pressing device according to claim 7, characterized in that: The first hot pressing plate (1) is provided with a mounting hole (101) penetrating along the first direction (Z); The connecting member (7) includes a connecting column (71) and a limiting protrusion (72), wherein the connecting column (71) passes through the mounting hole (101), and one end of the connecting column (71) along its length direction is connected to the smoothing plate (6), and the limiting protrusion (72) is arranged on the outer peripheral wall of the connecting column (71) and contacts the side of the first hot pressing plate (1) facing away from the second hot pressing plate (2).

9. The hot pressing device according to claim 8, characterized in that: The elastic member (8) is a spring, which is sleeved on the connecting column (71), and one end of the spring along its length direction is in contact with the smoothing plate (6), and the other end is in contact with the first hot pressing plate (1).

10. The hot pressing device according to claim 1, characterized in that: The driving module (3) comprises a fixing plate (31), a guide column (32) and a driving source (33); the fixing plate (31) is arranged on a side of the first hot pressing plate (1) away from the second hot pressing plate (2); the fixing plate (31) is provided with a guide hole (310) penetrating along the first direction (Z); the guide column (32) passes through the guide hole (310), and one end of the guide column (32) along the first direction (Z) is connected to the first hot pressing plate (1); the driving source (33) is fixedly arranged on the fixing plate (31), and the power output end of the driving source (33) is connected to the first hot pressing plate (1).

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