Conducting bar, battery module and battery pack

Abstract

The utility model belongs to the technical field of electrochemical inactive parts, and particularly provides a conducting bar, a battery module and a battery pack. The conducting bar comprises a main body, the main body is provided with two side parts which are oppositely arranged in the arrangement direction of positive and negative pole columns of a battery cell, the two side parts are respectively connected with a connecting part, and the two connecting parts are used for connecting the pole columns of different battery cells on the two sides of a line of battery cells. The battery module comprises at least two columns of battery cells, and in conducting bars used for connecting the battery cells in the same column, at least one conducting bar is consistent with the conducting bar in structure. The battery pack comprises the battery module. According to the utility model, the conducting bar can be connected with the poles at different sides of the center line, and at the moment, the positions of the output end positive pole and the output end negative pole can be determined firstly, so that the output end positive pole and the output end negative pole are ensured to be at the same side and have a large insulation distance.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrochemical inactive components, and in particular relates to a conductive bar, a battery module and a battery pack. Background Art

[0002] The battery module includes a number of battery cells (monomers). According to the actual voltage, current and capacity requirements, the battery cells are connected in series or in parallel through conductive bars. The conductive bar is generally a rectangular structure with a straight long strip shape as a whole, including a main body and a connecting part on the main body for connecting to the battery cell pole, which is connected to the battery cell pole by laser welding, bolting, riveting, etc. Generally speaking, when two adjacent battery cells need to be connected in series, the positive and negative poles of the two adjacent battery cells are set in opposite directions to each other, that is, the connection line of the positive pole of one battery cell and the negative pole of the other battery cell is parallel to the arrangement direction of the battery cells (the positive pole and the negative pole are located on the same side of the midline of the battery cells in the same column). In this way, the long strip of conductive bars connects the adjacent poles on the same side of the two battery cells to achieve series connection between the battery cells. When two adjacent battery cells need to be connected in parallel, the positive and negative poles of the two adjacent battery cells are arranged in the same direction, that is, the line connecting the positive pole of one battery cell and the positive pole of the other battery cell is parallel to the arrangement direction of the battery cells (the positive pole and the positive pole are located on the same side of the center line of the battery cells in the same column). In this way, the long conductive bus connects the adjacent poles on the same side of the two battery cells to achieve parallel connection between the battery cells.

[0003] The overall dimensions of battery packs used in different situations are not consistent. In addition to meeting the rated capacity, current, and voltage requirements, the battery module must also meet the overall dimensions. Therefore, dual-row or multi-row battery cell solutions began to appear. At this time, the battery cells can be connected in series and then in parallel, or in parallel and then in series, in combination as needed. At the same time, some projects require that the output positive and output negative poles of the battery module be on the same side. At this time, if the traditional long conductive bar is still used, this may cause the distance between the output positive and output negative poles of the battery module to be too close, which may cause weak insulation withstand voltage performance or operational short circuit problems. For ease of understanding, please refer to Figure 1 , Figure 1 A simplified schematic structure of a double-row battery module is given. Two adjacent battery cells 1 of the battery module need to be connected in parallel first and then connected in series with another group. At this time, although the traditional long strip conductive bar 2 can also realize the series-parallel connection relationship between the battery cells 1 and ensure that the output positive electrode and the output negative electrode are on the same side, the positions of the output positive electrode and the output negative electrode are close, which is prone to short circuit problems and is not safe. Utility Model Content

[0004] The purpose of the utility model is to provide a conductive bar to solve the technical problem that it is difficult for a battery module with double or multiple rows of cells in the prior art to achieve a large insulation distance between the output positive electrode and the output negative electrode while having the output positive electrode and the output negative electrode on the same side. The purpose of the utility model is also to provide a battery module and a battery pack to solve the same technical problem.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the conductive bar provided by the utility model is:

[0006] A conductive bar comprises a main body having two side portions which are arranged opposite to each other in the arrangement direction of the positive and negative poles of a battery cell, the two side portions are respectively connected with connecting portions, and the two connecting portions are used to connect the poles of different battery cells on both sides of the center line of a column of battery cells.

[0007] As a further improvement, the main body is formed by a bent protrusion that is higher than the connecting portion as a whole.

[0008] As a further improvement, a collecting portion for connecting a collecting wire harness is provided on the bending protrusion.

[0009] As a further improvement, each connection portion has at least two connection points for connecting to poles of different battery cells on the same side.

[0010] As a further improvement, the main body further comprises a span section for spanning over at least one battery cell to connect battery cells that are spaced apart from each other.

[0011] As a further improvement, the projection of the main body in the thickness direction of the conductive bar is a rectangle.

[0012] As a further improvement, the projection of the connecting portion in the thickness direction of the conductive bar is L-shaped.

[0013] As a further improvement, the two connecting parts are respectively arranged at the ends of the main body at both ends parallel to the center line direction of the battery core.

[0014] The beneficial effect of the utility model is that the embodiment belongs to an improved invention. When assembled into a battery module, since the connecting parts of the conductive row are arranged in opposite directions and can connect the poles located on different sides of the center line, the conductive row can be used to arrange the battery cells according to actual needs without being affected by the conductive row. Whether the positive poles of two adjacent battery cells are adjacent or the negative poles are adjacent, the conductive row in the utility model can realize the series connection or parallel connection between the battery cells. Therefore, for a battery module with two or more columns of battery cells, the positions of the positive and negative poles at the output end can be determined first to ensure that the positive and negative poles at the output end are on the same side and have a large insulation distance, and then the battery cells can be connected in series or parallel as needed.

[0015] To achieve the above purpose, the technical solution of the battery module provided by the utility model is:

[0016] A battery module includes at least two columns of battery cells, which are electrically connected to each other through conductive bars. Among the conductive bars used for the battery cells in the same column, at least one conductive bar includes a main body, which has two side portions arranged opposite to each other in the arrangement direction of the positive and negative poles of a battery cell, and the two side portions are respectively connected to connecting portions, and the two connecting portions connect the poles of different battery cells on both sides of the center line of a column of battery cells.

[0017] As a further improvement, the main body is formed by a bent protrusion that is higher than the connecting portion as a whole.

[0018] As a further improvement, a collecting portion for connecting a collecting wire harness is provided on the bending protrusion.

[0019] As a further improvement, each connection portion has at least two connection points connected to poles of different battery cells on the same side.

[0020] As a further improvement, the main body further comprises a span section spanning over at least one battery cell to connect battery cells that are spaced apart from each other.

[0021] As a further improvement, the projection of the main body in the thickness direction of the conductive bar is a rectangle.

[0022] As a further improvement, the projection of the connecting portion in the thickness direction of the conductive bar is L-shaped.

[0023] As a further improvement, the two connecting parts are respectively arranged at the ends of the main body at both ends parallel to the center line direction of the battery core.

[0024] The beneficial effect of the utility model is that the embodiment belongs to an improved invention. When assembled into a battery module, since the connecting parts of the conductive row are arranged in opposite directions and can connect the poles located on different sides of the center line, the conductive row can be used to arrange the battery cells according to actual needs without being affected by the conductive row. Whether the positive poles of two adjacent battery cells are adjacent or the negative poles are adjacent, the conductive row in the utility model can realize the series connection or parallel connection between the battery cells. Therefore, for a battery module with two or more columns of battery cells, the positions of the positive and negative poles at the output end can be determined first to ensure that the positive and negative poles at the output end are on the same side and have a large insulation distance, and then the battery cells can be connected in series or parallel as needed.

[0025] To achieve the above objectives, the technical solution of the battery pack provided by the utility model is:

[0026] A battery pack includes a battery module, which includes at least two columns of battery cells. The battery cells are electrically connected to each other through conductive bars. Among the conductive bars used for the battery cells in the same column, at least one conductive bar includes a main body, which has two side portions arranged opposite to each other in the arrangement direction of the positive and negative poles of a battery cell. The two side portions are respectively connected to connecting portions, and the two connecting portions connect the poles of different battery cells on both sides of the center line of a column of battery cells.

[0027] As a further improvement, the main body is formed by a bent protrusion that is higher than the connecting portion as a whole.

[0028] As a further improvement, a collecting portion for connecting a collecting wire harness is provided on the bending protrusion.

[0029] As a further improvement, each connection portion has at least two connection points connected to poles of different battery cells on the same side.

[0030] As a further improvement, the main body further comprises a span section spanning over at least one battery cell to connect battery cells that are spaced apart from each other.

[0031] As a further improvement, the projection of the main body in the thickness direction of the conductive bar is a rectangle.

[0032] As a further improvement, the projection of the connecting portion in the thickness direction of the conductive bar is L-shaped.

[0033] As a further improvement, the two connecting parts are respectively arranged at the ends of the main body at both ends parallel to the center line direction of the battery core.

[0034] The beneficial effect of the utility model is that the embodiment belongs to an improved invention. When assembled into a battery module, since the connecting parts of the conductive row are arranged in opposite directions and can connect the poles located on different sides of the center line, the conductive row can be used to arrange the battery cells according to actual needs without being affected by the conductive row. Whether the positive poles of two adjacent battery cells are adjacent or the negative poles are adjacent, the conductive row in the utility model can realize the series connection or parallel connection between the battery cells. Therefore, for a battery module with two or more columns of battery cells, the positions of the positive and negative poles at the output end can be determined first to ensure that the positive and negative poles at the output end are on the same side and have a large insulation distance, and then the battery cells can be connected in series or parallel as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram showing the electrical connection relationship of a double-row battery module assembled using conductive bars in the prior art;

[0036] Figure 2 This is a schematic diagram of the structure of the embodiment 1 of the battery module provided by the utility model;

[0037] Figure 3 for Figure 2 Schematic diagram of the structure of the special-shaped conductive bar;

[0038] Figure 4 for Figure 2 A schematic diagram of the structure of the special-shaped conductive row from another perspective;

[0039] Figure 5 for Figure 2 Schematic diagram of the installation relationship between the special-shaped conductive bar and the collection terminal;

[0040] Figure 6 This is a schematic diagram of the structure of the second embodiment of the battery module provided by the utility model;

[0041] Figure 7 This is a schematic structural diagram of Example 3 of the battery module provided by the utility model.

[0042] Description of reference numerals:

[0043] 1. Battery cell; 101. Center line; 102. Explosion-proof valve; 2. Long strip conductive bar; 200. Special-shaped conductive bar; 201. Main body; 202. Connecting part; 3. Collection terminal. DETAILED DESCRIPTION

[0044] In the prior art, the conductive bar connecting the poles of different cells is generally a long strip conductive bar, which can only connect the poles located on the same side of the center line of the cell. Therefore, when arranging the cells, according to the series-parallel relationship between the cells, it is necessary to consider the arrangement direction of the positive and negative poles of two adjacent cells. For a battery module with double-row cells, such as Figure 1 As shown, considering the position of the connected equipment during application, the positive and negative poles of the output end of the battery module are required to be on the same side. At this time, if the traditional long strip conductive bus is used, after the arrangement is completed, the positive and negative poles of the output end of the battery module can be on the same side, but the insulation distance between the positive and negative poles of the output end is short, which does not meet the requirements for safe electricity use.

[0045] In order to solve the above problems, the basic technical concept of the utility model is to provide a conductive bar that can connect the poles on different sides of the center line of the battery cell, so that the series and parallel connection between the battery cells can be realized as needed regardless of the direction of the positive and negative poles of the battery cells. Therefore, when arranging the battery cells, they will not be affected by the conductive bar, and sufficient insulation distance between the positive and negative poles on the output side can be ensured.

[0046] The present invention is further described in detail below in conjunction with the embodiments.

[0047] Specific embodiment 1 of the battery module provided by the utility model:

[0048] The battery module provided in this embodiment is as follows Figure 2As shown, it includes a total of 24 battery cells 1, and the 24 battery cells 1 are configured into two columns, and the battery cells 1 are connected by conductive bars. Specifically, two adjacent battery cells 1 are first connected in parallel to form a parallel group, and then connected in series with the parallel group formed by another two adjacent battery cells 1. The overall combination forms a "2 parallel 12 series" module form, and each column of battery cells 1 uses at least one special-shaped conductive bar 200.

[0049] Specifically, the structure of the special-shaped conductive bar 200 is as follows: Figure 2-Figure 4 As shown, it includes a main body 201, and the main body 201 has a direction for arranging the positive and negative poles of the same battery cell 1 ( Figure 3 The two sides are respectively connected with connecting parts 202, and the two connecting parts 202 are respectively used to connect with the poles of different cells 1 on both sides of the center line 101 (auxiliary line, which can be understood as the normal line passing through the midpoint of the line connecting the positive and negative poles) of the same column of cells 1. Figure 2 As shown, the two connecting parts 202 are respectively connected to the poles on both sides of the center line 101. Since the special-shaped conductive bar in this embodiment can be connected to the poles on different sides of the center line 101, when arranging the battery cell 1, there is no need to consider the direction of the poles of the battery cell 1, and both series and parallel connection can be achieved. In this way, for a battery module with double-row battery cells, the positions of the positive and negative poles at the output end can be determined first to ensure that the positive and negative poles at the output end are on the same side and have a large insulation distance, and then the battery cells 1 can be connected in series and parallel as needed.

[0050] More specifically, if Figure 4 As shown, the main body 201 in this embodiment is formed by a bent protrusion that is higher than the connecting portion 202 as a whole. In this way, the space below the protrusion forms an escape space for the electrical components (such as the explosion-proof valve 102) arranged on the battery cell 1, and there is no need to modify the structure of the battery cell 1. Of course, in other embodiments, if the structure of the battery cell 1 is different, for example, the explosion-proof valve 102 is not Figure 2 The main body 201 is not necessarily higher than the connecting portion 202 if the main body 201 is located between the two poles shown in FIG.

[0051] On the basis that the main body 201 is formed by a bent protrusion, a collection portion for connecting a collection harness is also provided on the bent protrusion. Figure 5 As shown, regarding the collection harness, those skilled in the art can understand that it is mainly used to collect information such as the temperature and voltage of the battery pack, including the collection terminal 3. Since the bending protrusion is relatively high overall, for the terminals in the form of riveting or bolting, a mounting hole can be set on the bending protrusion to facilitate the installation of the terminal. Of course, on the basis that the main body 201 is not higher than the connecting portion 202, the collection terminal 3 can also be connected to the main body 201 by welding.

[0052] In addition, if Figure 2-Figure 4 As shown, the connection portion 202 in this embodiment is provided with at least two connection points for connecting to poles of different battery cells 1 on the same side (located on the same side of the midline 101), that is, each connection portion 202 is respectively connected to at least two battery cells 1, so that two or more adjacent battery cells 1 can be connected in parallel to form a parallel group first, and then connected in series with the adjacent parallel group, which can expand more modes. Of course, according to the arrangement of the battery cells 1, if two adjacent battery cells 1 do not need to be connected in series or in parallel first, each connection portion 202 can include only one connection point.

[0053] like Figure 3 As shown, the projection of the main body 201 in the thickness direction of the conductive bar in this embodiment ( Figure 3 In the vertical direction of the paper, the connecting portion 202 is rectangular, which can ensure that there is a larger connection cross-sectional area between the connecting portion 202 and the main body 201, and the resistance is smaller. Of course, in other embodiments, the sizes of different battery cells 1 are also different, and the projection of the main body 201 in the thickness direction of the conductive bar is a square, which can also meet the setting of the connecting portion 202.

[0054] like Figure 3 As shown, the projection of the connecting portion 202 in the thickness direction of the conductive bar in this embodiment is L-shaped. In this case, the width of the main body 201 in the direction parallel to the center line 101 is not necessary to be too wide, so that when the main body 201 is longer, material can be saved.

[0055] like Figure 3 As shown, the two connecting parts 202 in this embodiment are respectively arranged at the end positions of the two ends of the main body 201 parallel to the center line 101 of the battery cell 1, that is, at the edge positions, so that the conductive bar can be regarded as a "Z" shape as a whole, which can also save materials. In other implementations, the connecting part 202 can also be arranged near the middle of the main body 201.

[0056] It should be noted that Figure 2 Only the case where one special-shaped conductive bar 200 is used in each column of battery cells is shown. In fact, since the connection and use of the special-shaped conductive bar 200 are relatively flexible, more than two special-shaped conductive bars 200 can certainly be used in each column of battery cells 1.

[0057] The specific embodiment 2 of the battery module provided by the present utility model is different from the embodiment 1 mainly in that: the present embodiment provides a battery module with three rows of battery cells, such as Figure 6As shown, the special-shaped conductive bar in Example 1 can also be used. Depending on the number of battery cells, the main body 201 of the special-shaped conductive bar used in a certain column also has a span section, which spans across two battery cells to connect the battery cells arranged separately. Depending on the number of battery cells, in fact, in different modules, the span section can also span only one battery cell.

[0058] The specific embodiment 3 of the battery module provided by the present utility model is different from the embodiment 1 mainly in that: the present embodiment provides a battery module with four rows of battery cells, such as Figure 7 As shown, the special-shaped conductive bar in Embodiment 1 can also be used at this time.

[0059] Specific embodiments of the conductive bar in the utility model:

[0060] The embodiment of the conductive bar is the special-shaped conductive bar described in any one of the embodiments 1 to 3 of the above-mentioned battery module, which will not be described in detail here.

[0061] Specific embodiments of the battery pack in this embodiment:

[0062] The battery pack includes a battery module having the same structure as the battery module in any of the above-mentioned battery module embodiments 1-3, which will not be described in detail here.

[0063] Finally, it should be noted that the above is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments without creative work, or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A conductive bar, comprising a main body, the main body having two side portions arranged opposite to each other in the arrangement direction of the positive and negative poles of a battery cell, characterized in that: The two side portions are respectively connected with connecting parts, and the two connecting parts are used to connect poles of different battery cells on both sides of the center line of a column of battery cells.

2. The conductive bar according to claim 1, characterized in that: The main body is formed by a bent protrusion which is higher than the connecting part as a whole.

3. The conductive bar according to claim 2, characterized in that: A collecting portion for connecting a collecting wire harness is provided on the bending protrusion.

4. The conductive bar according to any one of claims 1 to 3, characterized in that: Each connecting portion has at least two connecting points for connecting to poles of different cells on the same side.

5. The conductive bar according to any one of claims 1 to 3, characterized in that: The main body also has a span section for spanning over at least one battery cell to connect battery cells that are spaced apart from each other.

6. The conductive bar according to any one of claims 1 to 3, characterized in that: The projection of the main body in the thickness direction of the conductive bar is a rectangle.

7. The conductive bar according to any one of claims 1 to 3, characterized in that: The projection of the connecting portion in the thickness direction of the conductive bar is L-shaped.

8. The conductive bar according to any one of claims 1 to 3, characterized in that: The two connecting parts are respectively arranged at the ends of the main body at both ends parallel to the center line direction of the battery core.

9. A battery module, comprising at least two rows of cells, the cells being electrically connected to each other via a conductive bus, characterized in that: Among the conductive bars used in the same column of battery cells, at least one conductive bar is the conductive bar described in any one of claims 1 to 8.

10. A battery pack, comprising a battery module, wherein the battery module comprises at least two rows of battery cells, wherein the battery cells are electrically connected to each other via a conductive bus, wherein: Among the conductive bars used in the same column of battery cells, at least one conductive bar is the conductive bar described in any one of claims 1 to 8.

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