Cylindrical battery cell module

Abstract

The utility model provides a cylindrical battery cell module. A cylindrical battery cell module comprises a battery cell set composed of a plurality of battery cells and battery connecting pieces welded to the two ends of the battery cell set respectively, a plurality of protruding parts with the bottoms open and the interiors being cavities are arranged on the battery connecting pieces in an upwards-arched mode, and openings communicated with the cavities are formed in the left ends and the right ends of the protruding parts respectively. And the position of the convex part corresponds to that of the battery cell. Compared with the prior art, the cylindrical battery cell module has the advantages that the convex parts are arranged on the battery connecting pieces, and after the battery connecting pieces are welded, the tops of the convex parts can be easily stirred by using a small tool, so that the welding strength of each battery cell welding point is inspected, the manufacturing cost is reduced, the inspection efficiency is improved, and the inspection time is saved; the structural design and processing are easy to realize, and the function of checking the welding strength can be met.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power battery modules, and in particular to a cylindrical battery cell module. Background Art

[0002] The existing cylindrical battery module uses nickel sheets for busbar design, and resistance welding or laser welding is usually used for welding the battery pole and nickel sheet. For the welding strength at the solder joint, the appropriate pull-out force is specified through the preliminary DOE experiment (experimental design). However, the disadvantages of this solution are that DOE only performs data statistics to obtain appropriate welding parameters, and cannot fully guarantee welding reliability; welding reliability has multiple influencing factors, and each solder joint is not checked; the structure for checking the solder joint is not reserved during the design of the solution, and solder joint inspection cannot be achieved; it is impossible to identify cold solder joints or desoldering, resulting in customer complaints.

[0003] In addition, due to the current limited space conditions, the battery cells need to be arranged tightly and staggered, and the nickel sheets need to fit completely with the battery cells. To check the strength of the solder joints, a certain amount of space is needed to insert the tools to pick up the nickel sheets and check the strength of the solder joints. This type of inspection is inefficient, difficult and time-consuming. Utility Model Content

[0004] The present disclosure provides a cylindrical battery cell module to at least solve one of the technical problems existing in the prior art.

[0005] According to a first aspect of the present disclosure, there is provided a cylindrical battery cell module, comprising a battery cell group consisting of a plurality of battery cells, and battery connecting plates respectively welded to both ends of the battery cell group, wherein the battery connecting plates have a plurality of upwardly arched convex portions with open bottoms and cavities inside, and openings communicating with the cavities are respectively provided at the left and right ends of the convex portions, and the positions of the convex portions are arranged corresponding to the battery cells.

[0006] In one possible implementation manner, the protrusion and the battery connecting piece are an integral structure.

[0007] In one possible implementation manner, the protrusions are arranged along the length direction of the battery connecting piece.

[0008] In one possible implementation, the battery connecting sheet is a nickel sheet.

[0009] In one possible implementation manner, a plurality of guide grooves are further provided on the battery connecting piece, and the guide grooves are arranged along the length direction of the battery connecting piece, and the guide grooves are arranged corresponding to the battery cells.

[0010] In one possible implementation manner, the protrusion is connected to one end portion of the guide groove.

[0011] In one embodiment, a bracket assembly is further included, wherein the bracket assembly is adapted to the battery cell group and is used to fix the battery cell group.

[0012] In one embodiment, the bracket assembly includes an upper bracket and a lower bracket, the upper bracket has a plurality of mounting holes and is fixed to a first end of the battery cell group, and the lower bracket has a plurality of mounting holes and is fixed to a second end of the battery cell group.

[0013] In one possible implementation manner, mounting grooves are formed on the surfaces of the upper bracket and the lower bracket, and the shape of the mounting grooves is adapted to the shape of the battery connecting piece.

[0014] In one possible implementation manner, a plurality of fixing blocks are provided on the surfaces of the upper bracket and the lower bracket, and a plurality of fixing holes are opened at corresponding positions of the battery connecting piece, and the fixing blocks and the fixing holes cooperate to limit the movement of the battery connecting piece.

[0015] Compared with the prior art, the advantages of the present application are: 1) By setting a convex part on the battery connecting piece, the cylindrical battery cell module of the present application can be easily lifted by a small tool after the battery connecting piece is welded, so as to check the welding strength of each battery cell welding point, reduce the production cost, improve the inspection efficiency, and save the inspection time; this structural design and processing are easy to implement, and can meet the function of checking the welding strength; 2) The convex part and the battery connecting piece of the present application adopt an integrated structure, which can be integrally formed by a mold during the specific production, and the production is simple and convenient; 3) By setting a convex part, the cylindrical battery cell module of the present application can check the strength of the welding point of each battery cell, thereby ensuring the reliability of the product; and improving the quality assurance of the product without increasing the material and labor costs.

[0016] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present disclosure are shown in an exemplary and non-limiting manner, in which:

[0018] In the drawings, the same or corresponding reference numerals represent the same or corresponding parts.

[0019] Figure 1 The structure of the cylindrical battery module of the embodiment of the present disclosure is shown in FIG. Figure 1 ;

[0020] Figure 2The structure of the cylindrical battery module of the embodiment of the present disclosure is shown in FIG. Figure 2 ;

[0021] Figure 3 The exploded view of the cylindrical battery module of the embodiment of the present disclosure is shown Figure 1 ;

[0022] Figure 4 The exploded view of the cylindrical battery module of the embodiment of the present disclosure is shown Figure 2 .

[0023] Explanation of the numbers in the figure: 1-battery cell group, 11-battery cell, 2-battery connecting piece, 21-guide groove, 22-fixing hole, 3-protrusion, 31-opening, 32-cavity, 4-bracket assembly, 41-upper bracket, 42-lower bracket, 411-mounting hole, 412-mounting groove, 413-fixing block. DETAILED DESCRIPTION

[0024] In order to make the purpose, features, and advantages of the present disclosure more obvious and easy to understand, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present disclosure.

[0025] According to an embodiment of the present disclosure, the utility model provides a cylindrical battery module, such as Figure 1-4 As shown, the cylindrical battery cell module includes a battery cell group 1 composed of multiple battery cells 11, and battery connecting pieces 2 respectively welded at both ends of the battery cell group 1, and the battery connecting piece 2 has a plurality of upwardly arched protrusions 3 with open bottoms and cavities 32 inside, and openings 31 connected to the cavities are respectively provided at the left and right ends of the protrusions 3, and the positions of the protrusions 3 are arranged corresponding to the battery cells 11.

[0026] In this embodiment, the convex portion 3 is generally in a hemispherical shape, and because the convex portion is formed by convexing upward from the battery connecting piece, the convex portion 3 is a structure with an open bottom, a closed top, and a cavity inside, and openings 31 are provided at the left and right ends of the convex portion 3. Figure 1-2As shown, the opening at the left end of the protrusion 3 is generally a semicircular structure, and the opening at the right end is an arc-shaped structure. The opening at the left end is slightly larger than the opening at the right end, which is conducive to the lifting of the protrusion and convenient for the inspection of the battery core welding points. Therefore, the area below the protrusion 3 is an open area without interference from the battery connecting piece, rather than a closed area. Therefore, when checking the welding strength of the welding point of each battery core, the staff can easily lift the top of the protrusion 3 upwards, so that the protrusion drives a small part of the connected battery connecting piece, which is convenient for the staff to check the welding point of the battery core, and also convenient for the staff to easily use small tools to insert from the open area below the protrusion under the battery connecting piece to conduct an in-depth inspection of the welding strength of the welding point of each battery core.

[0027] In this embodiment, at least one protrusion 3 is provided on the battery connecting piece 2 at the position corresponding to each battery cell 11. When the battery connecting piece 2 is welded, the welding strength of the welding point of each battery cell 11 can be checked by provoking the protrusion 3. The number of protrusions provided on the battery connecting piece 2 depends on the number of battery cells. Since the battery connecting piece is provided with at least one protrusion 3 at each battery cell position, the number of protrusions 3 is at least equal to the number of battery cells, or the number of protrusions is an integer multiple of the number of battery cells. Preferably, the number of protrusions is 1 or 2 times the number of battery cells. When the number of protrusions is 1 times the number of battery cells, it means that the battery connecting piece 2 is provided with a protrusion 3 at the position corresponding to each battery cell. In order to more conveniently and effectively check the strength of each battery cell welding point in each row, the protrusions 3 are arranged along the length direction of the battery connecting piece 2. For example, the battery connecting piece 2 can be a nickel sheet.

[0028] like Figure 1-4 As shown, the battery connecting piece 2 has a convex portion at the position corresponding to each battery cell 11. Since the battery cells 11 constituting the battery cell group 1 are closely staggered, the center lines of each row of cylindrical battery cells are generally on the same line in the length direction of the battery connecting piece 2. Therefore, in order to facilitate the detection of each battery cell in each row, the convex portions 3 on the battery connecting piece corresponding to each row of battery cells are generally arranged on the same straight line. This arrangement is not only convenient for production, but also convenient for the staff to check each battery cell, ensuring product reliability, and keeping the cylindrical battery cell module beautiful.

[0029] Of course, when the number of protrusions 3 is twice the number of battery cells 11, it means that the battery connecting piece 2 has two protrusions at the positions corresponding to each battery cell 11. The two protrusions can be respectively arranged on both sides of the battery cell end. In order to more conveniently and effectively check the strength of the battery cell welding points, these protrusions can be arranged along the length direction of the battery connecting piece.

[0030] The cylindrical battery cell module of the present application only requires a convex portion 3 to be provided on the battery connecting piece 2. After the battery connecting piece 2 is welded, the top of the convex portion can be easily picked up by a small tool to check the welding strength of each welding point of the battery cell 11, thereby reducing the production cost, improving the inspection efficiency, and saving the inspection time. This structural design and processing are easy to implement and can meet the function of checking the welding strength.

[0031] In this embodiment, if Figure 3-4 As shown, the cylindrical battery cell module of the present application also includes a bracket assembly 4, which is adapted to the battery cell group 1 and is used to fix the battery cell group 1. Among them, the bracket assembly 4 includes an upper bracket 41 and a lower bracket 42. The structures of the upper bracket 41 and the lower bracket 42 are substantially the same. Taking the upper bracket 41 as an example, the upper bracket 41 has a plurality of mounting holes 411 for mounting the battery cells 11, and a mounting groove 412 is formed on the surface of the upper bracket 41. The shape of the mounting groove 412 is adapted to the shape of the battery connecting piece 2, which is used to limit the movement of the battery connecting piece 2. In addition, a plurality of fixing blocks 413 are provided on the surface of the upper bracket 41, and correspondingly, a plurality of fixing holes 22 are provided on the battery connecting piece 2. When the battery connecting piece 2 is placed on the mounting groove 412, the fixing block 413 protrudes from the fixing hole 22, further limiting the movement of the battery connecting piece 2. The upper bracket 41 is fixed to the first end of the battery cell group, that is, the first end of the battery cell 11 of the battery cell group 1 is installed in the installation hole 411 of the upper bracket 41, and the installation groove 412 and the fixing block 413 formed on the end surface of the upper bracket 41 extend toward the installation hole 411, so that when the first end of the battery cell is installed in the installation hole 411 of the upper bracket 41, the installation groove 412 and the fixing block 413 further fix the battery cell 11 of the battery cell group. Similarly, the lower bracket 42 is also fixed to the second end of the battery cell group 1 in this way. In this way, the bracket assembly 41 fixes the battery cell group 1 through the upper and lower brackets.

[0032] The upper bracket 41 and the lower bracket 42 are made of plastic. The bracket assembly 4 is used to fix the battery cell group so that the battery cells are closely staggered and arranged to save space. Then the battery cell group is connected in series and parallel and then converged through the nickel sheet. After the nickel sheet is welded, the convex bulge is manually moved with a small tool to check the welding strength of each welding point.

[0033] In one embodiment, the protrusion 3 and the battery connecting piece 2 are an integrated structure. The integrated structure is simple and convenient to manufacture, and improves manufacturing efficiency. For example, the battery connecting piece 2 and the protrusion 3 can be integrally formed by using a mold. Therefore, the protrusion 3 and the battery connecting piece 2 are made of the same material, such as a nickel sheet. Adding a protrusion to the nickel sheet and integrally forming it by a mold will not affect the function and structure of the entire product, nor will it increase the material cost.

[0034] In one embodiment, a plurality of guide grooves 21 are further provided on the battery connecting piece 2 . The guide grooves 21 are provided along the length direction of the battery connecting piece 2 . The guide grooves 21 are provided corresponding to the battery cells 11 .

[0035] like Figure 1-2 As shown, a guide groove 21 is provided on the battery connecting piece 2 at a position corresponding to each battery cell. The main function of the guide groove is to guide the flow direction of current so that the current is evenly distributed on the surface of the guide groove, thereby reducing current retention and heat accumulation and improving the heat dissipation effect of electronic components.

[0036] For example, the protrusion 3 is connected to one of the ends of the guide groove 21, that is, the protrusion 3 is arranged at one of the ends of the guide groove 21, and the two ends of the protrusion 3 are opened and the open cavity structure is connected to the guide groove. When the protrusion 3 and the battery connecting piece 2 adopt an integrated structure, the protrusion 3, the guide groove 21 and the battery connecting piece 2 can also be formed into one piece by a mold. A protrusion structure with both ends opened is designed at the end of the guide groove on the nickel sheet, and the top of the protrusion can be moved with a small tool to realize the inspection of the strength of each solder joint, thereby improving the inspection efficiency.

[0037] It should be understood that in the description of the present application, it is necessary to understand 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 orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0040] Furthermore, those skilled in the art may combine and associate different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0041] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A cylindrical battery cell module, comprising a battery cell group consisting of a plurality of battery cells, and battery connecting pieces respectively welded at both ends of the battery cell group, characterized in that: The battery connecting piece is arched upward with a plurality of convex parts with open bottoms and cavities inside, and openings communicating with the cavities are respectively provided at the left and right ends of the convex parts, and the positions of the convex parts are arranged corresponding to the battery cells.

2. The cylindrical battery module according to claim 1, characterized in that: The protrusion and the battery connecting piece are an integrated structure.

3. The cylindrical battery module according to claim 1, characterized in that: The protrusions are arranged along the length direction of the battery connecting piece.

4. The cylindrical battery cell module according to claim 1, characterized in that: The battery connecting sheet is a nickel sheet.

5. The cylindrical battery module according to claim 1, characterized in that: The battery connecting piece is also provided with a plurality of guide grooves, which are arranged along the length direction of the battery connecting piece and are arranged corresponding to the battery core.

6. The cylindrical battery cell module according to claim 5, characterized in that: The convex portion is connected to one end portion of the guide groove.

7. The cylindrical battery cell module according to any one of claims 1 to 6, characterized in that: It also includes a bracket assembly, which is adapted to the battery cell group and is used to fix the battery cell group.

8. The cylindrical battery module according to claim 7, characterized in that: The bracket assembly includes an upper bracket and a lower bracket. The upper bracket has a plurality of mounting holes and is fixed to a first end of the battery cell group. The lower bracket has a plurality of mounting holes and is fixed to a second end of the battery cell group.

9. The cylindrical battery cell module according to claim 8, characterized in that: The surfaces of the upper bracket and the lower bracket are both formed with mounting grooves, and the shapes of the mounting grooves are adapted to the shapes of the battery connecting pieces.

10. The cylindrical battery module according to claim 9, characterized in that: The surfaces of the upper bracket and the lower bracket are both provided with a plurality of fixing blocks, and a plurality of fixing holes are opened at corresponding positions of the battery connecting piece. The fixing blocks and the fixing holes cooperate to limit the movement of the battery connecting piece.

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