Battery cell connecting device and battery module therefor

Abstract

A battery cell connection device suitable for a battery cell having a conductive contact terminal at each of its two ends, wherein each conductive contact terminal has at least one conductive through-hole, the battery cell connection device comprising the following: a support frame, the top of which has a receiving recess in which at least one first lower mounting hole is provided; a conductive strip which is aligned with and received in the receiving recess of the support frame and has at least one first fastening hole which corresponds to the first lower mounting hole of the support frame; a pressure plate arranged above the conductive contact terminal to clamp and secure the conductive contact terminal of a battery cell between the conductive strip and the pressure plate, the pressure plate having at least one upper through-hole corresponding to the first mounting hole of the conductive strip and to the conductive through-hole of the conductive contact terminal; and at least one fastening element, which is successively passed through the upper through-hole of the pressure plate, the conductive through-hole of the conductive contact terminal, the first mounting hole of the conductive strip and the first lower mounting hole of the support frame, in order to bring the conductive contact terminal into close contact with the conductive strip and to fasten it to it, thus electrically connecting it to the conductive strip.

Description

Field of invention

[0001] The present invention relates to a connecting device and in particular a detachable, non-destructively attachable battery cell connecting device and a battery module therefor. State of the art

[0002] In response to the booming market for new energy vehicles, traction batteries have been developed as one of the three core technologies of new energy electric vehicles. The structural protection design and thermal management of traction batteries are considered crucial components of new energy electric vehicles. Simultaneously, low weight and increased energy density are essential trends for improving the range of new energy electric vehicles.

[0003] For battery cells with conductive contacts arranged on two sides, current series circuits are designed so that the battery cells are stacked on top of each other. The protruding conductive contacts of the battery cells are then guided through the corresponding holes on two sides of holders with multiple holes and bent. The conductive contacts are then laser-welded to the busbars of the holders. After the conductive contacts have been welded to the busbars, removing them to replace or repair a battery cell requires a destructive separation of the conductive contacts and the busbars, e.g., by desoldering. This irreparably damages the conductive contacts and renders the battery cell unusable.With the demand for high energy density and low weight, the thickness of a battery cell is constantly decreasing. However, the welding process has its limitations, meaning it cannot be infinitely adapted to the overall height of a battery cell. Regarding the distance between the mounting holes, a specific height must be maintained during laser welding to weld the electrically conductive contact connections. This severely restricts the configuration of the battery cells and prevents further increases in overall energy density.

[0004] Furthermore, the above method is characterized by the fact that the conductive contact on one side of each battery cell is passed through the bore of a holder, and the conductive contact on the other side of that battery cell is simultaneously passed through the bore of another holder in the same manner. Before and after passing the conductive contacts through the bores, they hang down due to gravity, increasing the risk of a short circuit due to mutual contact. After the conductive contacts have been bent and are in contact with the corresponding holders, they are welded to the busbars in their bending direction. This simultaneous execution of these steps is rather impractical, which does not improve the efficiency of the overall process.

[0005] To solve this problem, the applicant in Taiwanese patent application No. 112211125 proposed that two mounting brackets form a sliding cavity, with several movable support frames and several conductive strips located on the corresponding support frames within the sliding cavity. The conductive contact terminals of several stacked battery cells are held by the adjacent support frames and the corresponding conductive strips and welded to the conductive strips, thus enabling a sliding assembly. While this joining method reduces the welding problem, it remains a laser welding connection. Laser welding generates high temperatures, dust, shielding gases, and laser beams, which pose significant health risks to personnel.When an aged or defective battery cell needs to be replaced, all the battery cells stacked above it must first be removed. Because of the welded connection, this necessitates a destructive disassembly of the battery cells, damaging both the conductive contact terminals and other components. This leads to increased maintenance costs, as the components cannot be reused.

[0006] The invention is based on the objective of solving the above-mentioned problem and providing a battery cell connection device. Object of the invention

[0007] An object of the present invention is to provide a battery cell connection device and a battery module therefor, in which a detachable fastening element in conjunction with a pressure plate, a conductive strip and a support frame is used for fastening the conductive contact terminal of a battery cell, thereby facilitating the replacement or repair and maintenance of a battery cell in the event of aging or malfunctions and significantly reducing the costs of replacing or repairing and maintaining the module parts.

[0008] The battery cell connection device according to the invention is suitable for a battery cell that has a conductive contact terminal at each of its two ends, each conductive contact terminal having at least one conductive through-hole. The battery cell connection device comprises a support frame, a conductive strip, a pressure plate, and at least one fastening element, wherein the top of the support frame has a receiving recess, in which at least one first lower mounting hole is provided, the conductive strip is aligned with and received in the receiving recess of the support frame, the conductive strip has at least one first fastening hole corresponding to the first lower mounting hole of the support frame, and the pressure plate is arranged above the conductive contact terminal.to clamp and secure the conductive contact terminal of a battery cell between the conductive strip and the pressure plate, wherein the pressure plate has at least one upper through-hole corresponding to the conductive through-hole of the conductive contact terminal, wherein a fastening element is successively passed through the upper through-hole of the pressure plate, the conductive through-hole of the conductive contact terminal, the first mounting hole of the conductive strip, and the first lower mounting hole of the support frame to bring the conductive contact terminal into close contact with and secure it to the conductive strip, thus ensuring electrical contact. The fastening element may be a detachable component such as a screw, a blind rivet, or a rivet nut, allowing for non-destructive disassembly. If a battery cell needs to be replaced,It can be replaced without damage by removing the fastening element. This not only eliminates the hazards to personnel and the environment associated with laser welding, but also enables the reuse, repair, and maintenance of the removed battery cells and components, thereby significantly reducing maintenance costs.

[0009] Furthermore, the present invention provides a battery module comprising several battery cells, wherein the conductive contact terminals of the multiple battery cells are attached by means of the battery cell connection devices described above, and the support frames and the conductive strips are stacked successively in layers and electrically connected to one another via the corresponding fastening element. Therefore, if a battery cell needs to be repaired, serviced, or replaced, only the corresponding fastening element needs to be removed non-destructively. This avoids the problem in the prior art where all the battery cells above it have to be destructively disassembled for repair and maintenance.

[0010] To better understand the tasks, technical content, features and advantageous effects of the present invention, specific embodiments are described in detail below. Brief description of the drawings Fig. 1A and Fig. Figure 1B shows a schematic exploded view and an assembly view of the battery cell connection device according to the invention; Fig. Figures 2A to 2C each show a schematic exploded view and assembly views of another embodiment of the battery cell connection device according to the invention; Fig. Figure 3 shows a schematic view of the fastening element of the other embodiment of the battery cell connection device according to the invention; Fig. Figure 4 shows a schematic view of the fastening element of the other embodiment of the battery cell connection device according to the invention; Fig. Figure 5 shows a schematic assembly view in which the battery cell connection device according to the invention is used for a battery module; Fig. Figure 6 shows a schematic enlarged partial view in which the battery cell connection device according to the invention is used for a battery module. Detailed description of the exemplary implementations

[0011] To better understand the advantages, nature, and features of the present invention, exemplary embodiments are described in detail below with reference to the accompanying drawings. The present invention is described with reference to these exemplary embodiments and the drawings; however, the invention is not limited to these embodiments but only to the claims. These exemplary embodiments are provided solely to make the present disclosure more comprehensive and easier to understand.

[0012] The terminology used herein serves only to describe the exemplary embodiments and is not intended to limit the general concept of the invention. As used herein, the singular forms "a," "an," "an" and "the" are to include the plural forms as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning that a person skilled in the art in the field to which the exemplary embodiments belong would ascribe to them. Furthermore, it should be clarified that expressions, e.g.,Those terms that are defined in commonly used dictionaries are to be interpreted as having the meaning consistent with their meaning in the context of the relevant technology, and are not to be interpreted in an idealized or overly formal sense, unless expressly defined herein.

[0013] A reference in this entire specification to "a single embodiment" or "any embodiment" means that a function, structure, or property described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the expressions "in a single embodiment" or "in any embodiment" at various points in this specification do not necessarily all refer to the same embodiment, but may refer to different embodiments. Furthermore, as a person with average technical knowledge of this disclosure can infer, the individual functions, structures, or properties may be appropriately combined in one or more embodiments.

[0014] In describing the present invention, it should be noted that the terms "coupled," "connected," and "arranged" are to be understood broadly. For example, they may refer to a mechanical or electrical connection, or to an internal connection between two components, which may be connected directly or via an intermediate medium. The specific meanings of the above terms in the present invention will be clear to a person skilled in the art, depending on the specific situation.

[0015] It will be directed to the Fig. 1A and Fig. Reference is made to Figure 1B, which shows a schematic exploded view and an assembly view of the battery cell connection device according to the invention. The battery cell connection device according to the invention primarily comprises a pressure plate 10, a support frame 20, a conductive strip 30, and several fastening elements 40, wherein the top of the support frame 20 has a receiving recess 21, and the receiving recess 21 is provided with at least a first lower mounting bore 212 and a second lower mounting bore 211, wherein the receiving recess 21 located on the top of the support frame 20 is aligned with the conductive strip 30, such that the conductive strip 30 is received and fastened in the receiving recess 21.Electrically speaking, the conductive strips 30 perform a similar function to that of the busbars in the prior art, but differ in their structure, thus avoiding the problems caused by conventional busbars. In the present invention, the conductive strip 30 has a main body connection section 31 and a side edge connection section 32 located at the side edge of the conductive strip 30, wherein the side edge connection section 32 is located at a corner of the main body connection section 31 (such as the left corner in Figure 3). Fig. 1A), wherein the main body connection section 31 and the side edge connection section 32 are perpendicular to each other and electrically connected (here, for example, a one-piece formed construction or a construction in which the main body connection section 31 and the side edge connection section 32 are electrically connected by welding can be used). As in Fig. As shown in Figure 1A, the length of the main body connection section 31 corresponds approximately to the length of the receiving recess 21, wherein the main body connection section 31 is arranged in the receiving recess 21 and the side edge connection section 32 extends from one side of the main body connection section 31 both upwards and downwards in the Z-axis direction (vertically) and is arranged in a rectangular front recess 213 located on the side of the receiving recess 21 furthest from a battery cell 70. The height of the upwardly and downwardly projecting areas of the side edge connection section 32 provides a sufficient area for a connection terminal 321.A projecting section 312, located away from the side-edge connection section 32, is higher than the other parts of the main body connection section 31 and serves as an additional reinforcing support structure in the area of ​​the receiving recess 21, where the pressure plate 10 and the conductive contact connection 71 are not provided. This support structure is designed to absorb the load generated by the subsequently stacked support frames 20 and thus prevent deformation and damage. During assembly, in this embodiment, the conductive strip 30 is installed using the second mounting holes 311 located on two sides of the main body connection section 31 and the second lower mounting holes 211 located in the receiving recess 21, and is secured in the receiving recess 21 of the support frame 20 by means of the first locking elements 51 (such as screws).Of course, the conductive strip 30 and the support frame 20 can also be joined together using an adhesive. In this version, the second fastening holes 311 and the second lower mounting holes 211 (not shown) can be omitted.

[0016] The battery cell connection device according to the invention is suitable for a battery cell 70 which has a conductive contact terminal 71 at each of its two ends (see Fig. 5) For example, in the present embodiment, two battery cells 70 are stacked on top of each other, and their conductive contact terminals 71 located on the same side are stacked on top of each other. That is, each battery cell 70 has a conductive contact terminal 71 of opposite polarity at each of its two ends. The conductive contact terminals 71 of the same polarity can be stacked on top of each other to form a parallel circuit. Alternatively, the conductive contact terminals 71 of different polarities can be stacked on top of each other to form a series circuit.During assembly, each conductive strip 30 is first received and secured in the receiving recess 21 of the corresponding support frame 20. First locking elements 51 (such as screws) are passed through the second mounting holes 311 located on two sides of the main body connection section 31 of the corresponding conductive strip 30 and secured in the second lower mounting holes 211 of the corresponding receiving recess 21. Subsequently, the conductive contact terminals 71 of the stacked battery cells 70 (e.g., a first and a second battery cell) are placed onto the corresponding conductive strip 30. In the case of a series connection, the two conductive contact terminals 71 of two battery cells 70 located on the same side have different polarities (e.g., one positive and one negative terminal).The support frames 20 consist of insulating material to prevent short circuits between the conductive strips 30 or conductive contact terminals 71 of different layers.

[0017] Corresponding to the first lower mounting holes 212 of a respective support frame 20, each conductive contact terminal 71 has at least one conductive through-hole 72, and the main body connection section 31 of each conductive strip 30 has at least one first fastening hole 33. Fastening elements 40 are then passed through these holes to electrically connect each conductive contact terminal 71 to the corresponding conductive strip 30. In the present invention, the fastening elements 40 can be mounted and dismounted non-destructively. As shown in the Fig. 1A and Fig. As shown in the embodiment illustrated in Figure 1B, the fastening elements 40 are, for example, screws, and each conductive contact terminal 71 is generally a thin metal sheet, so that direct locking or force application poses a risk of deformation or damage to it. Therefore, a pressure plate 10 is additionally provided above each conductive contact terminal 71, so that the pressure forces generated when locking the fastening elements 40 act primarily on the pressure plate 10. Similarly, each pressure plate 10 also has upper through-holes 11, which are aligned with the first lower mounting holes 212 of the corresponding support frame 20.During assembly, the fastening elements 40 are successively inserted through the upper through-holes 11 of the corresponding pressure plate 10, the conductive through-holes 72 of the conductive contact terminal 71 of the corresponding battery cell 70, the first mounting holes 33 of the main body connection section 31 of the corresponding conductive strip 30, and the first lower mounting holes 212 of the receiving recess 21 of the corresponding support frame 20. To secure the fastening elements 40 (in this embodiment, they are designed as screws), a threaded bushing 41 can be inserted into a respective first lower mounting hole 212 of a respective support frame 20, so that after insertion, the fastening elements 40 can be locked in the corresponding first lower mounting holes 212 of the respective support frame 20.In this way, the conductive contact terminal 71 of a respective battery cell 70 and the corresponding conductive strip 30 are clamped at the top and bottom by the corresponding pressure plate 10 and the corresponding support frame 20, whereby this conductive contact terminal 71 is in close contact with the main body connection section 31 of this conductive strip 30 and is electrically connected to it.

[0018] As already mentioned, the main function of each pressure plate 10 is to buffer and absorb the stress generated when the corresponding fastening elements 40 are inserted, in order to prevent deformation of the corresponding conductive contact terminal 71 and to maintain its flatness. At the same time, this pressure plate must possess a certain rigidity to protect this conductive contact terminal 71. Therefore, the material of the pressure plate should be slightly elastic and stress-absorbing, e.g., plastic or metal (for example, stainless steel).

[0019] It will be directed to the Fig. Reference is made to Figures 2A to 2C, which each show a schematic exploded view and assembly views of another embodiment of the battery cell connection device according to the invention. In the present embodiment, instead of inserting a threaded bushing 41 into the first lower mounting bore 212 of the corresponding support frame 20, as mentioned above, a nut 42 can also be inserted into the first fastening bore 33 of the main body connection section 31 of the corresponding conductive strip 30, so that the fastening elements 40 are passed through the corresponding nuts 42 and locked in place. Similarly, a conductive contact terminal 71 can be brought into close contact with the corresponding conductive strip 30 and electrically connected to it.As described in the previous embodiment, each fastening element 40 has the form of a screw which is easy to assemble and disassemble and offers the advantages of low cost, light weight and reusability.

[0020] It will be on Fig. 3. Reference is made to the screws described above. In addition to the screws described above, the fasteners 40 can also be designed as blind rivets. The use of blind rivets eliminates the need for the threaded bushings described above, which increases vibration resistance, reduces assembly effort, and speeds up assembly. It is referred to Fig. 4. Reference is made to this. Furthermore, the fastening elements 40 can also be designed as rivet nuts. The use of rivet nuts also eliminates the need for the previously described threaded bushings, which increases vibration resistance and fastening force, thus largely preventing the connection from loosening.

[0021] When the present invention is used for a battery module 60, several battery cells 70 are fastened together and electrically connected by several battery cell connection devices. It is applied to the Fig. 1A, Fig. 5 and Fig. 6. Referenced. Fig. Figure 5 shows a schematic assembly view in which the battery cell connection device according to the invention is used for a battery module; and Fig. Figure 6 shows a schematic enlarged partial view in which the battery cell connection device according to the invention is used for a battery module. The conductive contact terminals 71 of the several battery cells 70 are attached to the corresponding conductive strips 30 by means of the battery cell connection devices according to the invention. On the upper side of each support frame 20, positioning sections 241 projecting beyond this upper side are arranged diagonally offset. On the underside of each support frame 20, positioning recesses 242 are arranged at the locations corresponding to the positioning sections 241, so that adjacent, stacked support frames 20 can be positioned relative to each other and stacked on top of each other by means of the positioning sections 241 and the positioning recesses 242.In other words, the positioning sections 241 and the positioning recesses 242 enable both vertical positioning of the support frames 20 along the Z-axis and limitation of movement along the X-axis. The number, shape, and design of the positioning sections 241 and the positioning recesses 242 can be adapted as needed, as long as a secure vertical and horizontal connection (e.g., by snap-fit ​​or tenon joint) between the support frames 20 is ensured. To fasten the battery module 60 vertically along the Z-axis, several module mounting holes 23 are provided on two outer sides of each support frame 20. Second locking elements 52 are passed through these holes to fasten all the support frames 20 together.

[0022] At the same time, the positions of the side-edge connection sections 32 of different conductive strips 30, each assigned to two adjacent support frames 20, are arranged offset from one another, as shown in Fig. Figure 6 shows that the side-edge connection sections 32 are located alternately at the left and right corners. The staggered arrangement of the side-edge connection sections 32 prevents the occurrence of a short circuit. To ensure that the side-edge connection sections 32 of the conductive strips 30 remain accessible after the support frames 20 are stacked, the receiving recess 21 of each support frame 20, at the position corresponding to the side-edge connection section 32 of the respective conductive strip 30 on the side furthest from the corresponding battery cell 70, is provided with a rectangular front recess 212.That is, at one end of each receiving recess 21, a rectangular front recess 212, which allows a view of the corresponding side-edge connecting section 32, is provided on the front of a corresponding support frame 20, wherein, corresponding to the side-edge connecting section 32, the position of the recess is on the left or right side of this conductive strip 30, so that the recess is provided at the left or right end of this receiving recess 21. As shown in the . Fig. 5 and Fig. As shown in Figure 6, the side-edge connection sections 32 are exposed on the left and right sides of the battery module 60. Since each conductive contact terminal 71 is electrically connected to the corresponding conductive strip 30, the connection terminal 321 of the side-edge connection section 32 of this conductive strip 30 can be used to connect an external cable (not shown) to acquire the various electrical properties (including resistance, voltage, etc.) of an individual battery cell 70. That is, the connection terminals can be used as connection points for the battery module's monitoring and management module to monitor the electrical status of all battery cells 70 in real time.

[0023] Furthermore, in addition to the series or parallel connection already mentioned, the stacking configuration of the battery cells 70 can also be adapted by implementing mixed circuits (in series and parallel) throughout the entire battery module (60). After stacking is complete, a top shell 61 can be placed on top for protection, or a shell can be attached to the bottom and sides to protect the entire battery structure (not shown). In this way, a battery module 60 is completed, which has been assembled using the battery cell connection devices according to the invention, as shown in the Fig. 5 and Fig. Figure 6 shows that a heat dissipation material can be arranged between the battery cells 70. This heat dissipation material can be a metal sheet (e.g., aluminum sheet) to improve the heat dissipation effect after the battery cells 70 are stacked. Alternatively, a buffer material can be added between the battery cells 70 to increase the resistance of the entire battery module 60 to external impacts.

[0024] It will be on Fig. 5. The conductive strips 30 of the uppermost and lowermost support frames 20 are each provided with an outwardly extending electrical terminal 101, 102, these terminals serving as current output terminals (combined positive terminal and combined negative terminal, respectively) of the battery module 60. Since the electrical terminals 101, 102 are designed as direct extensions of the corresponding conductive strip 30, and these conductive strips 30 are electrically connected to the conductive contact terminals 71 of adjacent battery cells 70, the arrangement of the two electrical terminals 601, 602 can be flexibly arranged on the same or opposite sides, as required (as shown in...). Fig. (As shown in Figure 5, they are located on the same page). This allows for the easy implementation of series, parallel, or mixed circuits with varying numbers of battery cells.

[0025] In summary, the present invention provides a battery cell connection device and a battery module for this purpose, in which the push plates, the conductive contact terminals of the battery cells, and the support frames with the conductive strips provided thereon are stacked directly on top of each other and assembled. For fastening, non-destructively removable fasteners (such as screws, blind rivets, rivet nuts, etc.) are successively passed through the corresponding push plate, the corresponding conductive contact terminal, the corresponding conductive strip, and the corresponding support frame, thereby electrically connecting each conductive contact terminal to the corresponding conductive strip. If a single damaged battery cell within the battery module needs to be replaced, it can be quickly removed and replaced without permanent damage, thus facilitating repair and replacement.Furthermore, the welding required for conventional stacking of battery cells and the associated risk of damage are eliminated.

[0026] In summary, the present invention comprises a battery cell connection device and a battery module therefor, comprising several support frames and several conductive strips adapted to them, wherein a respective conductive strip is received in the receiving recess on the top of the corresponding support frame, in conjunction with the arrangement of a pressure plate, at least one fastening element is successively passed through the pressure plate, the conductive contact terminal of a battery cell, the conductive strip and the mounting holes of the support frame in order to bring the conductive contact terminal and the conductive strip into close contact and fasten them together, wherein the fastening element enables a releasable fastening.This makes it possible to replace a battery cell without destructively disassembling multiple battery cells, significantly improving safety during assembly as well as ease of repair and maintenance.

[0027] The foregoing description presents only preferred embodiments of the invention and is not intended to limit the scope of the claims. All equivalent changes and modifications that can be made by a person skilled in the art in this field according to the description and drawings of the invention are within the scope of protection of the present invention. Reference symbol list 10 Pressure plate 11 upper through hole 20 support frames 21. Admission exemption 211 second lower mounting hole 212 first lower mounting hole 213 front recess 23 Module mounting holes 241 Positioning section 242 Positioning deepening 30 conductive strips 31 Main body connection section 311 second mounting hole 312 preceding section 32 Side margin connecting section 321 Connection port 33 first mounting hole 40 Fastening element 41 Threaded bushing 42 Screw nuts 51 first locking element 52 second locking element 60 battery module 601, 602 electrical connection terminal 61 Upper shell 70 battery cells 71 conductive contact connection 72 conductive through holes QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] TW 112211125

[0005]

Claims

[1] A battery cell connection device suitable for a battery cell having a conductive contact terminal at each of its two ends, wherein each conductive contact terminal has at least one conductive through-hole, the battery cell connection device comprising: a support frame, the top of which has a receiving recess in which at least one first lower mounting hole is provided; a conductive strip which is aligned with and received in the receiving recess of the support frame and has at least one first fastening hole which corresponds to the first lower mounting hole of the support frame; a pressure plate arranged above the conductive contact terminal to clamp and secure the conductive contact terminal of a battery cell between the conductive strip and the pressure plate, the pressure plate having at least one upper through-hole corresponding to the first mounting hole of the conductive strip and to the conductive through-hole of the conductive contact terminal; and at least one fastening element, which is successively passed through the upper through-hole of the pressure plate, the conductive through-hole of the conductive contact terminal, the first mounting hole of the conductive strip and the first lower mounting hole of the support frame, in order to bring the conductive contact terminal into close contact with the conductive strip and to fasten it to it, thus electrically connecting it to the conductive strip. [2] Battery cell connection device according to claim 1, wherein the fastening element is a screw, a blind rivet or a rivet nut. [3] Battery cell connection device according to claim 2, wherein the fastening element is a screw, wherein a threaded bushing adapted to this screw is inserted into the first lower mounting bore of the support frame. [4] Battery cell connection device according to claim 2, wherein the fastening element is a screw, wherein a screw nut adapted to this screw is inserted into the first fastening hole of the conductive strip. [5] Battery cell connection device according to claim 1, wherein the support frame has at least one second lower mounting hole and the conductive strip has at least one second fastening hole, wherein the conductive strip is attached to the support frame by means of a first locking element. [6] Battery cell connection device according to claim 1, wherein the conductive strip has a main body connection section and a side edge connection section, the side edge connection section extending vertically from one side of the main body connection section to both the top and bottom and being located in the front recess of the receiving recess, the main body connection section having a projecting section located on the main body connection section and away from the side edge connection section. [7] A battery module comprising: several battery cells, each having a conductive contact terminal at two ends, each conductive contact terminal having at least one conductive through-hole; and several battery cell connection devices that are adapted to and serve to fasten these battery cells, each battery cell connection device comprising the following: a support frame, the top of which has a receiving recess in which at least one first lower mounting hole is provided; a conductive strip which is aligned with and received in the receiving recess of the support frame and has at least one first fastening hole which corresponds to the first lower mounting hole of the support frame; a pressure plate arranged above the conductive contact terminal to clamp and secure the conductive contact terminal of a battery cell between the conductive strip and the pressure plate, the pressure plate having at least one upper through-hole corresponding to the first mounting hole of the conductive strip and to the conductive through-hole of the conductive contact terminal; and at least one fastening element, which is successively passed through the upper through-hole of the pressure plate, the conductive through-hole of the conductive contact terminal, the first mounting hole of the conductive strip and the first lower mounting hole of the support frame, in order to bring the conductive contact terminal into close contact with the conductive strip and to fasten it to the conductive strip and thus connect it electrically to the conductive strip; the support frames and the battery cells are stacked on top of each other in layers. [8] Battery module according to claim 7, wherein each conductive strip has a main body connection section and a side edge connection section, the side edge connection section being located at a corner of the main body connection section and the main body connection section and the side edge connection section being perpendicular to each other and being electrically connected to each other. [9] Battery module according to claim 8, wherein the first mounting hole of a respective conductive strip is provided on the corresponding main body connection section. [10] Battery module according to claim 9, wherein each side edge connection section has a front and a rear opposite it, the front being located away from the corresponding battery cell and the rear being located near the corresponding battery cell, the front having a connection port and the receiving recess of the corresponding support frame having a front recess on the side of the receiving recess located away from the corresponding battery cell, such that after stacking the support frames the connection port for connecting to an external cable is exposed through this front recess on the front of the corresponding support frame. [11] Battery module according to claim 7, wherein each support frame has at least one positioning section and at least one positioning recess by which the support frames are stacked on top of each other and positioned relative to each other. [12] Battery module according to claim 11, wherein the at least one positioning section is located on the top of the corresponding support frame and projects obliquely diagonally, and the at least one positioning recess is located on the bottom of the corresponding support frame and is aligned with the at least one positioning section. [13] Battery module according to claim 7, wherein the conductive strips of the uppermost and the lowermost support frame each extend outwards and form an electrical terminal. [14] Battery module according to claim 7, wherein each support frame has at least one module mounting hole through which a second locking element is passed to secure the support frames. [15] Battery module according to claim 7, wherein each conductive strip has a main body connection section and a side edge connection section, the side edge connection section extending vertically from one side of the main body connection section to both the top and bottom and being located in the front recess of the corresponding receiving recess, the main body connection section having a projecting section located on the main body connection section and away from the side edge connection section.

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