Single cell and battery module

Abstract

The single cell comprises a cell body and an electrode connecting piece, the cell body is provided with a shell and a pole which are opposite in polarity, the electrode connecting piece comprises two electrode connecting pieces, one ends of the two electrode connecting pieces are respectively connected with the shell and the pole, and the other ends of the two electrode connecting pieces are respectively connected with the shell and the pole. And the other end of each electrode connecting sheet is provided with a connecting area for bonding or mechanical connection, so that the single battery core is electrically connected with an external structure. As the electrode connecting pieces are pre-connected to the single battery cells, the single battery cells are connected with the current collecting row by adopting a bonding or mechanical connection process instead of adopting a welding process after entering the shell, so that on one hand, the process is convenient to carry out; and on the other hand, faults caused by poor welding and part damage generated in the welding process are avoided, and the assembly yield of the battery module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a single battery cell and a battery module. Background Art

[0002] With the continuous development of the modern electronic technology industry, higher requirements have been put forward for the functionality and practicality of batteries. As an indispensable component inside the battery module, the single cell and its connection performance with the bus are also important indicators for measuring the practicality and functionality of the battery.

[0003] In the assembly process of existing battery modules, multiple single cells are usually packed into a cell group in multiple rows and columns, and then installed into the shell. The busbar is welded to the pole or shell of the single cell according to the series and parallel connection requirements of the single cell. This process increases the difficulty of welding, and if poor welding occurs during the welding process, the single cell may be damaged, and in serious cases, the entire battery module may even be scrapped.

[0004] Therefore, based on the above technical problems, it is urgent to propose a single cell that is convenient to connect to a bus and a battery module with a relatively simple assembly process and a high yield rate. Utility Model Content

[0005] The first purpose of the utility model is to provide a single cell battery having an electrode connecting piece with the pole and the shell. After a plurality of cells are grouped, it is only necessary to connect the electrode connecting piece with the external structure according to the series and parallel connection requirements of the single cells, which is convenient for assembly and beneficial to improving the manufacturing yield of the battery module.

[0006] The second object of the present invention is to provide a battery module, the assembly process of which is relatively simple and the manufacturing yield is relatively high.

[0007] In order to achieve the above technical effects, the technical solution of the utility model is as follows:

[0008] The utility model discloses a single battery cell, comprising: a battery cell body, wherein the battery cell body has a shell and a pole with opposite polarities; an electrode connector, wherein the electrode connector comprises two electrode connecting pieces, one end of each of the two electrode connecting pieces is respectively connected to the shell and the pole, and the other end of each of the electrode connecting pieces is provided with a connecting area for bonding or mechanical connection, so as to realize electrical connection between the single battery cell and an external structure.

[0009] In some embodiments, the two electrode connecting sheets are located at the same end of the battery cell body.

[0010] In some embodiments, one end of the two electrode connecting sheets provided with the connecting area both extends out of the battery cell body.

[0011] In some embodiments, the electrode connecting sheet is connected to the external structure by riveting, the connecting area includes a riveting plane, and the riveting planes of the two electrode connecting sheets are arranged flush.

[0012] In some embodiments, the two electrode connecting sheets are welded to the housing and the electrode column respectively.

[0013] The utility model also discloses a battery module, comprising a plurality of the above-mentioned single cells and a current collector, wherein the plurality of the single cells are arranged at intervals, and the current collector is used to realize electrical connection between the plurality of the single cells.

[0014] In some specific embodiments, the electrode connecting sheet and the current collecting bar are positioned by a positioning structure.

[0015] In some more specific embodiments, the positioning structure includes a positioning hole and a positioning column matched with the positioning hole, one of the positioning hole and the positioning column is arranged on the current collecting bar, and the other is arranged on the electrode connecting sheet.

[0016] In some more specific embodiments, there are multiple positioning holes and multiple positioning posts.

[0017] In some specific embodiments, the electrode connecting sheet is provided with a first rivet hole, the current collecting bar is provided with a second rivet hole corresponding to the first rivet hole, and the rivet piece passes through the first rivet hole and the second rivet hole to connect the electrode connecting sheet with the current collecting bar.

[0018] The beneficial effects of the single cell of the utility model are as follows: since the electrode connecting piece is pre-connected on the single cell, it does not need to be connected to the collector bar by welding after entering the shell, but is connected to the collector bar or the lead-out structure of the battery module by bonding or mechanical connection. On the one hand, it facilitates the process, and on the other hand, it avoids malfunctions caused by poor welding and damage to parts caused during the welding process, which is beneficial to improving the assembly yield of the battery module.

[0019] The beneficial effects of the battery module of the present invention are as follows: since the single cell battery mentioned above is provided, an electrode connecting piece is integrated on the single cell battery, which facilitates the connection between the single cell battery and the current collecting bar, and also facilitates the electrical connection between the single cell battery and the lead-out structure of the battery module. At the same time, after being grouped into the shell, the single cell battery does not need to be connected to the current collecting bar by a welding process, but the electrode connecting piece is connected to the current collecting bar by a bonding or mechanical connection process. On the one hand, it facilitates the process, and on the other hand, it avoids malfunctions caused by poor welding and damage to components caused during the welding process, which is beneficial to improving the assembly yield of the battery module.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a single cell of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the exploded structure of a single cell of an embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of two single cells connected in series in an embodiment of the utility model;

[0024] Figure 4 It is a schematic diagram of the exploded structure of a single cell and a current collector of an embodiment of the utility model;

[0025] Figure 5 It is a schematic structural diagram of two single battery cells connected in parallel in an embodiment of the utility model.

[0026] Reference numerals:

[0027] 110, battery cell body; 111, pole; 112, shell;

[0028] 121, first connecting piece; 122, second connecting piece; 1221, connecting portion; 1222, riveting portion; 1201, riveting plane; 1202, positioning hole; 1203, first riveting hole;

[0029] 200, current collecting bar; 210, positioning column; 220, second riveting hole;

[0030] 300. Riveted parts. DETAILED DESCRIPTION

[0031] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention are further explained below with reference to the accompanying drawings and through specific implementation methods.

[0032] In the description of the present invention, 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", "axial", "radial", "circumferential" 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 invention 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 invention.

[0033] In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of the features, and are used to distinguish and describe features, without distinction of order or importance. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 2 The specific structure of a single cell of an embodiment of the utility model is described.

[0036] The utility model discloses a single battery cell, such as Figure 1As shown, the single cell includes a cell body 110 and an electrode connector, and the cell body 110 has a shell 112 and a pole 111 with opposite polarities. In this embodiment, the shell 112 is a negative electrode, and the pole 111 is a positive electrode (of course, in other embodiments of the utility model, the shell 112 can also be a positive electrode, and the pole 111 is a negative electrode). The electrode connector includes two electrode connecting pieces, which are a first connecting piece 121 and a second connecting piece 122. One end of the first connecting piece 121 is connected to the pole 111, and one end of the second connecting piece 122 is connected to the shell 112. The other end of the first connecting piece 121 and the other end of the second connecting piece 122 are both provided with a connection area for bonding or mechanical connection, so as to realize the electrical connection of multiple single cells with external structures. It should be noted that after the single cells are grouped, one end of the first connecting plate 121 and the second connecting plate 122 with a connection area can be connected to the collector 200 to realize multiple single cells in series, multiple single cells in parallel, or multiple single cells in mixed connection. The lead-out structure of the battery module can also be connected to realize electrical connection between multiple single cells and external structures.

[0037] It is understandable that, during the assembly process, the first connecting piece 121 and the second connecting piece 122 are first assembled onto the battery body 110, and then a plurality of single cells are fixed into the shell according to actual needs, and finally the collector 200 and the electrode connecting piece are fixed by bonding or mechanical connection according to circuit needs. The single cells of this embodiment do not need to be connected to the collector 200 by welding after being put into the shell, but are connected to the collector 200 by bonding or mechanical connection, which facilitates the process on the one hand, and avoids faults caused by poor welding and damage to components caused during the welding process on the other hand, which is conducive to improving the assembly yield of the battery module.

[0038] It should be noted that the bonding in this embodiment refers to the use of conductive adhesive and other materials to achieve conductive connection between the collector 200 and the electrode connecting sheet, and the mechanical connection may refer to a conductive connection method achieved by using rivets, screws and other connecting parts.

[0039] Optionally, the first connecting piece 121 and the second connecting piece 122 are both aluminum plates, which are cheap and convenient to bond or mechanically connect. The first connecting piece 121 and the second connecting piece 122 are both aluminum plates, which can reduce the manufacturing cost of the single cell on the one hand, and facilitate bonding or mechanical connection between the first connecting piece 121 and the current collector 200 and between the second connecting piece 122 and the current collector 200 on the other hand. Of course, in other embodiments of the utility model, the materials of the first connecting piece 121 and the second connecting piece 122 can be selected from copper sheets and other conductive materials according to actual needs, and the materials of the first connecting piece 121 and the second connecting piece 122 can be the same or different, which can be determined specifically according to the conductive needs of the battery module.

[0040] refer to Figure 1 As shown, in this embodiment, the first connecting piece 121 and the second connecting piece 122 are located at the same end of the battery body 110. It can be understood that the first connecting piece 121 and the second connecting piece 122 are located on the same side of the battery body 110, which is conducive to the fixation of the collector 200. Specifically, after the single battery cell is placed in the shell, the collector 200 only needs to be assembled from one end of the single battery cell, without fixing from both ends, which further facilitates the assembly of the battery module.

[0041] Optionally, the first connecting piece 121 and the second connecting piece 122 are both located at one end of the battery cell body 110 provided with the pole 111. It is understandable that the first connecting piece 121 and the second connecting piece 122 are both located at one end of the battery cell body 110 provided with the pole 111, which can shorten the length of the first connecting piece 121 and eliminate the need to bend the first connecting piece 121, thereby simplifying the structure and improving the connection stability between the first connecting piece 121 and the pole 111.

[0042] Further optionally, one end of the first connecting piece 121 and the current collector 200 having a connection area and one end of the second connecting piece 122 having a connection area both extend out of the battery cell body 110. It can be understood that since one end of the first connecting piece 121 having a connection area and one end of the second connecting piece 122 having a connection area both extend out of the battery cell body 110. In the case where the first connecting piece 121 and the second connecting piece 122 are connected to the current collector 200, when the current collector 200 is fixed to two first connecting pieces 121 (or two second connecting pieces 122; or one first connecting piece 121 and one second connecting piece 122), the connection position of the current collector 200 and the first connecting piece 121 or the second connecting piece 122 is between two adjacent battery cell bodies 110, which facilitates the process on the one hand, and can also avoid the phenomenon of damaging the battery cell body 110 during the process on the other hand.

[0043] When the first connecting piece 121 and the second connecting piece 122 are connected to the lead-out structure of the battery module, the connection position of the first connecting piece 121 or the second connecting piece 122 of the lead-out structure is just outside the battery cell body 110, which not only facilitates the process but also avoids damage to the battery cell body 110 during the process.

[0044] It should be additionally explained here that the length of the first connecting piece 121 extending out of the battery cell body 110 and the length of the second connecting piece 122 extending out of the battery cell body 110 can be selected according to actual needs, and the length of the end of the first connecting piece 121 with the connection area and the end of the second connecting piece 122 with the connection area extending out of the battery cell body 110 are not limited.

[0045] refer to Figure 1 As shown, in this embodiment, the first connecting piece 121 and the second connecting piece 122 are riveted to the collector bar 200 or the lead-out structure of the battery module, and the connection area is a riveted plane 1201. The riveted plane 1201 of the first connecting piece 121 and the riveted plane 1201 of the second connecting piece 122 are arranged flush. It can be understood that the riveted plane 1201 of the first connecting piece 121 and the riveted plane 1201 of the second connecting piece 122 are arranged flush so that the collector bar 200 can be placed on the first connecting piece 121 or on the first connecting piece 121 to maintain a horizontal state, which facilitates the process, thereby avoiding the phenomenon of poor connection caused by the skew of the collector bar 200.

[0046] Further optionally, the first connecting piece 121 is a sheet structure of equal thickness, and the second connecting piece 122 includes a connecting portion 1221 and a riveted portion 1222, wherein the connecting portion 1221 is used to be connected to the outer shell 112, and the surface of the riveted portion 1222 facing away from the outer shell 112 is flush with the surface of the first connecting piece 121 facing away from the pole 111, and the surface of the riveted portion 1222 facing the outer shell 112 is flush with the surface of the connecting portion 1221 facing away from the outer shell 112.

[0047] In some embodiments, the first connecting piece 121 and the second connecting piece 122 are welded to the housing 112 and the pole 111, respectively. It is understandable that the first connecting piece 121 is connected to the pole 111 by welding, and the second connecting piece 122 is welded to the housing 112. On the one hand, it is convenient to connect the first connecting piece 121 and the second connecting piece 122 to the battery body 110, and on the other hand, it is conducive to improving the connection stability of the first connecting piece 121 and the second connecting piece 122. Of course, in other embodiments of the utility model, the first connecting piece 121 can be bonded to the pole 111 by conductive glue, or it can be connected to the pole 111 by other methods. The second connecting piece 122 can be bonded to the housing 112 by conductive glue, or it can be connected to the housing 112 by other methods.

[0048] Reference below Figure 3-Figure 4 The specific structure of the battery module of the embodiment of the utility model is described.

[0049] The utility model also discloses a battery module, including a plurality of the above-mentioned single cells and a current collector 200, wherein the plurality of single cells are arranged at intervals, and the current collector 200 is used to realize the electrical connection between the plurality of single cells. It is understandable that in the actual assembly process, the first connecting piece 121 and the second connecting piece 122 are first assembled to the cell body 110, and then the plurality of single cells are fixed into the shell according to actual needs, and finally the current collector 200 and the electrode connecting piece are fixed by bonding or mechanical connection according to the circuit needs. Due to the use of the above-mentioned single cell, the electrode connecting piece is integrated on the single cell, which facilitates the connection between the single cell and the current collector 200, and also facilitates the electrical connection between the single cell and the lead-out structure of the battery module. And after entering the shell, it is not necessary to use a welding process to connect to the current collector 200, but to use a bonding or mechanical connection process to connect to the current collector 200, which facilitates the process on the one hand, and avoids the failure caused by poor welding and the damage of parts and components generated during the welding process on the other hand, which is conducive to improving the assembly yield of the battery module.

[0050] It should be noted that, in this embodiment, the single cells in the battery module can be connected in series or in parallel. Figure 3 As shown, in two adjacent single cells, when the first connecting piece 121 of one single cell is connected to the second connecting piece 122 of another single cell through the current collecting bar 200, the two single cells are connected in series; Figure 5 As shown, in two adjacent single cells, the first connecting pieces 121 of the two single cells are connected through a current collector 200, and the second connecting pieces 122 of the two single cells are connected through another current collector 200. In this way, the two single cells are connected in parallel. Of course, when the number of single cells is other numbers, the parallel structure can be determined according to the parallel connection mode of the two single cells, which will not be repeated here.

[0051] It should be additionally explained that when multiple single battery cells need to be mixed in series and parallel, they can be derived according to the above-mentioned series connection method and parallel connection method, and the method of mixing multiple single battery cells will not be elaborated here.

[0052] refer to Figure 3 As shown, in this embodiment, the first connecting sheet 121 and the second connecting sheet 122 are positioned with the current collecting bar 200 by the positioning structure. It can be understood that in the actual working process, the current collecting bar 200 and the positioning structure are first positioned by using the positioning structure, and then the electrode sheet connecting sheet is bonded or mechanically connected to the current collecting bar 200 by using a bonding or mechanical connection process. The positioning function of the positioning structure can avoid the phenomenon of misalignment of the current collecting bar 200 during the bonding or mechanical connection process, thereby ensuring the connection accuracy of the current collecting bar 200.

[0053] In some more specific embodiments, the positioning structure includes a positioning hole 1202 and a positioning post 210 that cooperates with the positioning hole 1202, one of the positioning hole 1202 and the positioning post 210 is provided on the collector 200, and the other is provided on the electrode connecting sheet. It is understandable that in the actual working process, it is only necessary to make the positioning hole 1202 provided on the collector 200 cooperate with the positioning post 210 provided on the electrode connecting sheet or the positioning post 210 provided on the collector 200 cooperate with the positioning hole 1202 provided on the electrode connecting sheet, so as to complete the positioning of the collector 200 and the electrode connecting sheet, and facilitate assembly.

[0054] It should be noted here that the distribution of the positioning holes 1202 and the positioning posts 210 can be selected according to actual needs; taking the connection of two adjacent single cells in series as an example, at this time, the two ends of the current collector 200 are respectively connected to the first connecting piece 121 and the second connecting piece 122. In some embodiments, the first connecting piece 121 is provided with a first positioning hole, the second connecting piece 122 is provided with a second positioning hole, and the current collector 200 is provided with a first positioning post that cooperates with the first positioning hole and a second positioning post that cooperates with the second positioning hole; in some embodiments, the first connecting piece 121 is provided with a first positioning hole, and the second connecting piece 122 is provided with a second positioning hole. Column, the collecting bar 200 is provided with a first positioning column that cooperates with the first positioning hole, and a second positioning hole that cooperates with the second positioning column; in some embodiments, the first connecting piece 121 is provided with a first positioning column, the second connecting piece 122 is provided with a second positioning hole, and the collecting bar 200 is provided with a first positioning hole that cooperates with the first positioning column, and a second positioning column that cooperates with the second positioning hole; in some embodiments, the first connecting piece 121 is provided with a first positioning column, the second connecting piece 122 is provided with a second positioning column, and the collecting bar 200 is provided with a first positioning hole that cooperates with the first positioning column, and a second positioning hole that cooperates with the second positioning column.

[0055] Taking the parallel connection of two adjacent single battery cells as an example, at this time, the two ends of the current collector 200 are respectively connected to two first connecting plates 121 or two second connecting plates 122, taking the connected two first connecting plates 121 as an example; in some embodiments, the two first connecting plates 121 are both provided with a first positioning column, and the current collector 200 is provided with a first positioning hole; in some embodiments, the two first connecting plates 121 are both provided with a first positioning hole, and the current collector 200 is provided with a first positioning column; in some embodiments, a first positioning hole is provided on one first connecting plate 121, and a second positioning column is provided on the other first connecting plate 121, and the first positioning column and the second positioning hole are simultaneously provided on the current collector 200.

[0056] It should be noted that the positioning hole 1202 can be a round hole, a square hole, an irregular hole, etc., and the positioning column 210 can be a round column, a square column, an irregular column that matches the positioning hole 1202, or it can be a structure that does not match the positioning hole 1202, and only needs to be able to be inserted into the positioning hole 1202.

[0057] Preferably, there are multiple positioning holes 1202 and multiple positioning posts 210. The cooperation of multiple positioning holes 1202 and multiple positioning posts 210 can ensure that the header 200 has been positioned with the first connecting piece 121, or the header 200 has been positioned with the second connecting piece 122 before the bonding or mechanical connection process is performed, thereby avoiding the phenomenon of poor connection caused by the skewness of the header 200 during the bonding or mechanical connection process.

[0058] It should be additionally explained that in other embodiments of the present invention, the positioning structure may be a positioning groove and a positioning ridge, or any other structure that can play a positioning role.

[0059] refer to Figure 4 As shown, the first connecting piece 121 and the second connecting piece 122 are both provided with a first rivet hole 1203, the current collector 200 is provided with a second rivet hole 220 corresponding to the first rivet hole 1203, and the rivet 300 passes through the first rivet hole 1203 and the second rivet hole 220 to connect the first connecting piece 121 with the current collector 200, or the rivet 300 passes through the first rivet hole 1203 and the second rivet hole 220 to connect the second connecting piece 122 with the current collector 200. It can be understood that in the actual assembly process, the rivet 300 passes through the first rivet hole 1203 and the second rivet hole 220 to connect the electrode connecting piece with the current collector 200 using a pressure riveting process, which, on the one hand, facilitates the connection process of the electrode connecting piece and the current collector 200, and on the other hand, is conducive to improving the connection stability of the electrode connecting piece and the current collector 200.

[0060] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0061] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A single cell, characterized in that: include: A battery cell body (110), wherein the battery cell body (110) has a shell (112) and a pole (111) with opposite polarities; An electrode connector, the electrode connector comprising two electrode connecting sheets, one end of each of the two electrode connecting sheets being connected to the outer shell (112) and the pole (111) respectively, and the other end of each of the electrode connecting sheets being provided with a connecting area for bonding or mechanical connection so as to realize electrical connection between the single cell and an external structure.

2. The single cell according to claim 1, characterized in that: The two electrode connecting sheets are located at the same end of the battery cell body (110).

3. The single cell according to claim 1, characterized in that: One end of the two electrode connecting sheets provided with the connecting area both extends out of the battery cell body (110).

4. The single cell according to claim 1, characterized in that: The electrode connecting sheet is connected to the external structure by riveting, and the connecting area includes a riveting plane (1201), and the riveting planes (1201) of the two electrode connecting sheets are arranged flush.

5. The single cell according to claim 1, characterized in that: The two electrode connecting sheets are respectively welded to the housing (112) and the pole (111).

6. A battery module, characterized in that: It comprises a plurality of single cells and a current collector (200) as described in any one of claims 1 to 5, wherein the plurality of single cells are arranged at intervals, and the current collector (200) is used to realize electrical connection between the plurality of single cells.

7. The battery module according to claim 6, characterized in that: The electrode connecting sheet and the current collecting bar (200) are positioned via a positioning structure.

8. The battery module according to claim 7, characterized in that: The positioning structure comprises a positioning hole (1202) and a positioning column (210) matched with the positioning hole (1202); one of the positioning hole (1202) and the positioning column (210) is arranged on the current collecting bar (200), and the other is arranged on the electrode connecting sheet.

9. The battery module according to claim 8, characterized in that: There are multiple positioning holes (1202) and multiple positioning posts (210).

10. The battery module according to claim 6, characterized in that: The electrode connecting sheet is provided with a first rivet hole (1203), the current collecting bar (200) is provided with a second rivet hole (220) corresponding to the first rivet hole (1203), and the rivet member (300) passes through the first rivet hole (1203) and the second rivet hole (220) to connect the electrode connecting sheet with the current collecting bar (200).

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