A busbar structure and battery module

Abstract

The present invention discloses a busbar structure and a cell module, wherein the busbar structure includes a positive output pole; a negative output pole; the positive output pole busbar is connected to the positive output pole; the negative output pole busbar is connected to the negative output pole; a plurality of intermediate busbars, wherein the intermediate busbar has a cell negative pole connection part and a cell positive pole connection part; the cell negative pole connection part of the first intermediate busbar and the positive output pole busbar are insulated from each other and are stacked, and the cell positive pole connection part of the last intermediate busbar and the negative output pole busbar are insulated from each other and are stacked. The cell module includes a module support, and a cell matching structure is provided on the module support; the cell array includes a plurality of single cells, and the positive poles of the single cells all face the module support and match the cell matching structure; the busbar structure, wherein the busbar structure is provided on the module support; the single cells of the cell array are connected by the busbar structure to form a cell module. It can effectively simplify the product process, reduce the production process, and save production costs.

Description

Technical Field

[0001] The present invention is used in the field of battery packs, and in particular relates to a busbar structure and a battery core module. Background Art

[0002] At present, cylindrical battery cell modules are generally composed of multiple single battery cells in series and parallel. First, several battery cells are connected in parallel to form a group, and then multiple groups of battery cells are connected in series to form a module. The positive and negative directions of each group of battery cells are consistent, and the positive and negative directions of the battery cells in adjacent groups are just opposite. The positive pole of one group of battery cells and the negative pole of another group of battery cells are connected through a whole bus to realize the series connection between the groups of battery cells. Therefore, the bus needs to be arranged on both sides of the module. When the module is produced, it is necessary to fix the bus on one side first, and then flip the bus on the other side as a whole to fix it. When the bus is directly welded to the battery cell, it also needs to be flipped back and forth for welding. This places high requirements on the equipment and the process is relatively complicated, and it is impossible to achieve mass production of larger-sized modules. Summary of the invention

[0003] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a bus structure and a battery cell module, which can effectively simplify the product process, reduce the production process, save production costs, and improve the efficiency of automated production.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a busbar structure, comprising

[0005] Positive output pole;

[0006] Negative output pole;

[0007] A positive output busbar connected to the positive output electrode;

[0008] A negative output pole busbar connected to the negative output pole;

[0009] A plurality of intermediate busbars, each of which has a negative electrode connection portion for a battery cell and a positive electrode connection portion for a battery cell;

[0010] The cell negative electrode connection part of the first intermediate bus and the positive output electrode bus are insulated from each other and arranged in layers, and the cell positive electrode connection part of the last intermediate bus and the negative output electrode bus are insulated from each other and arranged in layers.

[0011] As a further improvement of the technical solution of the present invention, when multiple intermediate busbars are provided, the positive electrode connection portion of the battery cell of the previous intermediate busbar and the negative electrode connection portion of the battery cell of the next intermediate busbar are insulated from each other and are distributed in a stacked manner.

[0012] As a further improvement of the technical solution of the present invention, the busbar structure is divided into an upper layer and a lower layer, the positive output pole busbar and the negative output pole busbar are distributed in the lower layer, and a plurality of intermediate busbars are alternately distributed in the upper layer and the lower layer in turn.

[0013] As a further improvement of the technical solution of the present invention, an insulating structure is provided between the upper layer and the lower layer.

[0014] As a further improvement of the technical solution of the present invention, a plurality of battery core welding wire windows are provided on the positive output pole bus bar and / or the negative output pole bus bar and / or the intermediate bus bar.

[0015] A battery module, comprising

[0016] A module support, on which a cell matching structure is provided;

[0017] The battery cell array includes a plurality of single battery cells, wherein the positive electrodes of the single battery cells all face the module support and cooperate with the battery cell matching structure;

[0018] The busbar structure described in any of the above embodiments, wherein the busbar structure is arranged on the module support;

[0019] The single cells of the cell array are connected through a bus structure to form a cell module, and the cell module outputs voltage to the outside through the positive output electrode and the negative output electrode.

[0020] As a further improvement of the technical solution of the present invention, the battery cell matching structure includes a battery cell hole array provided on the module support, the battery cell hole array includes a plurality of battery cell holes corresponding to each single battery cell, and the bus structure is provided on the top of the module support.

[0021] As a further improvement of the technical solution of the present invention, three or more odd-numbered single-cell positive electrodes are arranged horizontally in a row toward the module support, several rows of single-cells with the same number are arranged vertically to form a group, and several groups of single-cells are arranged horizontally to form a cell array.

[0022] As a further improvement of the technical solution of the present invention, cell welding wire windows are provided on the positive output pole bus, the negative output pole bus and the intermediate bus at positions directly opposite to the single cell.

[0023] As a further improvement of the technical solution of the present invention, the positive output bus is connected to the positive electrode of the first group of single cells through a conductive connector, the negative electrode connecting portion of the intermediate bus is connected to the negative electrode of the previous group of single cells through a conductive connector, the positive electrode connecting portion of the intermediate bus is connected to the positive electrode of the next group of single cells through a conductive connector, and the negative output bus is connected to the negative electrode of the last group of single cells through a conductive connector.

[0024] One of the above technical solutions has at least one of the following advantages or beneficial effects: the busbar structure is stacked and distributed, and the position of connection with the battery core is completely staggered to ensure electrical insulation safety. It can realize single-sided busbar of the module, and the module does not need to be flipped back and forth during the production process like the double-sided busbar module, which can effectively simplify the product process, reduce the production process, save production costs, and improve the efficiency of automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with the accompanying drawings:

[0026] Figure 1 It is a schematic structural diagram of an embodiment of a busbar structure of the present invention;

[0027] Figure 2 It is an exploded view of an embodiment of a busbar structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of an embodiment of a battery cell module of the present invention;

[0029] Figure 4 Schematic diagram of the structure of a module support of an embodiment of a battery module of the present invention;

[0030] Figure 5 It is an exploded view of an embodiment of a battery cell module of the present invention. DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0032] In the present invention, if there is a description of a direction (up, down, left, right, front and back), it is based on Figure 1 , Figure 3 The structure shown is a reference description, but it is only for the convenience of describing the technical solution of the present invention, rather than indicating or implying that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0033] In the present invention, "several" means one or more, "multiple" means more than two, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself. In the description of the present invention, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0034] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected or electrically connected or able to communicate with each other; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0035] An embodiment of the present invention provides a bus structure, comprising

[0036] Positive output pole 1;

[0037] Negative output pole 2;

[0038] The positive output electrode bus 3 is connected to the positive output electrode 1;

[0039] A negative output electrode bus bar 4 connected to the negative output electrode 2;

[0040] A plurality of intermediate busbars 5, each of which has a negative electrode connection portion 51 and a positive electrode connection portion 52;

[0041] The cell negative electrode connection portion 51 of the first intermediate bus 5 and the positive output electrode bus 3 are insulated from each other and stacked, and the cell positive electrode connection portion 52 of the last intermediate bus 5 and the negative output electrode bus 4 are insulated from each other and stacked.

[0042] When in use, the positive output bus 3, the middle bus 5, and the negative output bus 4 are respectively connected to the single cells in the corresponding area, and the positive or negative electrodes of multiple single cells are converged together to form an equipotential, so as to realize the series and parallel connection of the single cells in the cell module. The bus structure adopts a stacked distribution, and the position of the connection with the cell is completely staggered to ensure that there is no short circuit and creepage between different parallel cells, with high safety and reliability, and ensure electrical insulation safety. Moreover, it can realize the single-sided convergence of the module, and the module does not need to be flipped back and forth during the production process like the double-sided bus module, which can effectively simplify the product process, reduce the production process, save production costs, and improve the efficiency of automated production.

[0043] In one or some embodiments, an intermediate bus 5 is provided, and the battery cell negative electrode connection part 51 of the intermediate bus 5 is insulated from the positive output electrode bus 3 and stacked, and the battery cell positive electrode connection part 52 of the intermediate bus 5 is insulated from the negative output electrode bus 4 and stacked. The positive output electrode bus 3, the intermediate bus 5, and the negative output electrode bus 4 are respectively connected to the single battery cells in the corresponding area, and the positive or negative electrodes of multiple single battery cells are converged together to form an equipotential, so as to realize the series connection and parallel connection of the single battery cells of the battery module. The bus structure adopts a stacked distribution, and the position of the connection with the battery cell is completely staggered, so as to ensure that there is no short circuit and creepage between different parallel battery cells, and the safety and reliability are high, and the electrical insulation safety is guaranteed.

[0044] In one or some embodiments, multiple intermediate busbars 5 are provided, the negative electrode connection part 51 of the first intermediate busbar 5 and the positive output pole busbar 3 are insulated from each other and stacked, and the positive electrode connection part 52 of the last intermediate busbar 5 and the negative output pole busbar 4 are insulated from each other and stacked. The positive electrode connection part 52 of the previous intermediate busbar 5 and the negative electrode connection part 51 of the next intermediate busbar 5 are insulated from each other and stacked. The positive output pole busbar 3, the intermediate busbar 5, and the negative output pole busbar 4 are respectively connected to the single cells in the corresponding area, and the positive or negative electrodes of multiple single cells are converged together to form an equipotential, so as to realize the series connection and parallel connection of the single cells of the cell module. The busbar structure adopts a stacked distribution, and the position of the connection with the cell is completely staggered to ensure that there is no short circuit and creepage between different parallel cells, and the safety and reliability are high, and the electrical insulation safety is guaranteed.

[0045] In one or some embodiments, the busbar structure is divided into multiple layers. Preferably, the busbar structure is divided into an upper layer and a lower layer. The positive output pole busbar 3 and the negative output pole busbar 4 are distributed in the lower layer, and multiple intermediate busbars 5 are alternately distributed in the upper layer and the lower layer in turn. The positive output pole busbar 3, the intermediate busbar 5, and the negative output pole busbar 4 are respectively connected to the single cells in the corresponding area, and the positive or negative electrodes of the multiple single cells are converged together to form an equipotential, so as to realize the series connection and parallel connection of the single cells of the cell module. The busbar structure adopts a stacked distribution, and the position of the connection with the cell is completely staggered to ensure that there is no short circuit and creepage between different parallel cells, and the safety and reliability are high, and the electrical insulation safety is guaranteed.

[0046] In one or some embodiments, an insulating structure 6 is provided between the upper layer and the lower layer. The insulating structure 6 adopts an insulating layer, an insulating plate, etc. The main function of the insulating structure 6 is to insulate and isolate the overlapping parts of the upper bus and the lower bus to ensure electrical insulation safety.

[0047] In one or some embodiments, a plurality of battery cell welding wire windows are opened on the positive output pole bus 3 and / or the negative output pole bus 4 and / or the intermediate bus 5. The positive output pole bus 3 and / or the negative output pole bus 4 and / or the intermediate bus 5 are in a grid shape, a tree branch shape, etc. The battery cell welding wire windows are used to facilitate the connection between the bus and the electrodes of the single battery cell. The frame structure outside the bus window can cleverly realize the series connection and parallel connection between the battery cells, which plays a role in reducing weight and preventing short circuits, while ensuring that short circuits and creepage do not occur between different parallel battery cells, and has high safety and reliability.

[0048] A battery module, comprising

[0049] A module support 7, on which a cell matching structure is provided;

[0050] The battery cell array includes a plurality of single battery cells 8, each of which has a positive electrode facing the module support 7 and cooperates with the battery cell matching structure;

[0051] The busbar structure described in any of the above embodiments, the busbar structure is arranged on the module bracket 7;

[0052] The single cells 8 of the cell array are connected through a bus structure to form a cell module, and the cell module outputs voltage to the outside through the positive output electrode 1 and the negative output electrode 2.

[0053] The battery cell module can achieve single-sided bus bus module. During the production process, there is no need to flip the module back and forth like the double-sided bus module. This can effectively simplify the product process, reduce the production process, save production costs, and improve the efficiency of automated production.

[0054] In one or some embodiments, the cell matching structure can be directly formed on the module support 7, for example, by slotting, opening, setting a position, etc. on the module support 7, or can be formed separately from the module support 7 and then assembled and connected with the module support 7. Preferably, the cell matching structure includes an array of cell holes 71 provided on the module support 7, and the array of cell holes 71 includes a plurality of cell holes 71 corresponding to each single cell 8.

[0055] In some embodiments, the busbar is arranged at the top or bottom of the module bracket 7. Preferably, the busbar structure is arranged at the top of the module bracket 7. A busbar mounting structure is arranged at the top of the module bracket 7. The busbar mounting structure is divided into two layers, the lower layer part is attached to the lower layer busbar, and the higher layer part is attached to the upper layer busbar. During the production process, the corresponding upper and lower busbar positions on the module bracket 7 are first coated with glue, and then the lower layer busbar, the insulating structure and the upper layer busbar are placed in the corresponding positions in turn, and the equipment is pressed. After the glue is cured, the upper and lower layers of the busbars are connected as a whole.

[0056] In one or some embodiments, the battery cell array can be arranged in any horizontal, vertical, or oblique direction. Preferably, three or more odd-numbered single battery cells 8 are arranged horizontally in a row with their positive electrodes facing the module support 7, several rows of single battery cells 8 of the same number are arranged vertically to form a group, and several groups of single battery cells 8 are arranged horizontally to form a battery cell array. Battery cell welding wire windows are provided on the positive output bus, the negative output bus, and the intermediate bus at positions directly opposite to the single battery cells 8. The positive output bus is connected to the positive electrode of the first group of single battery cells 8 through a conductive connector 9, the battery cell negative electrode connection part of the intermediate bus is connected to the negative electrode of the previous group of single battery cells 8 through a conductive connector 9, the battery cell positive electrode connection part of the intermediate bus is connected to the positive electrode of the next group of single battery cells 8 through a conductive connector 9, and the negative output bus is connected to the negative electrode of the last group of single battery cells 8 through a conductive connector 9. Among them, the conductive connector 9 is made of metal sheets, metal wires, etc. As a preferred embodiment, the conductive connector 9 is made of aluminum wire, and the two ends of the aluminum wire are welded to the electrodes of the busbar and the single battery cell 8 to achieve connection. The positive electrodes of all single battery cells 8 face the module support 7. The single-side busbar has two layers, which are arranged above the single battery cell 8. The upper and lower layers of the busbars are isolated by an insulating plate in the middle, and the welding positions of the busbars and the battery cells between the upper and lower layers are staggered. One layer of the busbars is welded to the positive electrode in the middle of the cylindrical battery cell through the aluminum wire, and the other layer of the busbars is welded to the outer edge shell (negative electrode) of the cylindrical battery cell through the aluminum wire, so as to achieve single-sided fixing of the busbar and single-sided welding of the busbar and the battery cell.

[0057] The above embodiment also has the following advantages: 1. The battery cells are arranged with the positive poles facing the module holder 7, and the arrangement is regular, which is easy for equipment control; there are few bus specifications and types, except for the end positive output bus and the negative output bus, all other buses can share the same specification size, which greatly reduces the types of bus parts and saves part development costs; the welding direction of the aluminum wire is regular, which is easy for equipment control.

[0058] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A battery cell module, characterized in that: include A module support, on which a cell matching structure is provided; The battery cell array includes a plurality of single battery cells, wherein the positive electrodes of the single battery cells all face the module support and cooperate with the battery cell matching structure; The busbar structure is arranged on the module support, the busbar structure is arranged on the top of the module support, the top of the module support is provided with a busbar mounting structure, the busbar mounting structure is divided into two layers, the lower layer part is attached to the lower layer busbar, and the higher layer part is attached to the upper layer busbar; The single cells of the cell array are connected through a bus structure to form a cell module, and the cell module outputs voltage to the outside through the positive output electrode and the negative output electrode; The bus structure includes Positive output pole; Negative output pole; A positive output busbar connected to the positive output electrode; A negative output pole busbar connected to the negative output pole; A plurality of intermediate busbars, each of which has a negative electrode connection portion for a battery cell and a positive electrode connection portion for a battery cell; The cell negative electrode connection part of the first intermediate bus and the positive output electrode bus are insulated from each other and arranged in layers, and the cell positive electrode connection part of the last intermediate bus and the negative output electrode bus are insulated from each other and arranged in layers; The positive output pole bus bar, the negative output pole bus bar and the middle bus bar form two upper and lower layers, and an insulating structure is arranged between the upper layer and the lower layer.

2. The battery cell module according to claim 1, characterized in that: The cell matching structure comprises a cell hole array arranged on the module support, the cell hole array comprises a plurality of cell holes corresponding to each single cell, and the busbar structure is arranged on the top of the module support.

3. The battery cell module according to claim 2, characterized in that: Three or more odd-numbered single cells are arranged in a row with their positive electrodes facing the module support, several rows of single cells with the same number are arranged in the longitudinal direction to form a group, and several groups of single cells are arranged in the transverse direction to form a cell array.

4. The battery cell module according to claim 3, characterized in that: Cell welding wire windows are provided on the positive output pole bus, the negative output pole bus and the middle bus at positions directly opposite to the single cell.

5. The battery cell module according to claim 3 or 4, characterized in that: The positive output bus is connected to the positive electrode of the first group of single cells through a conductive connector, the negative electrode connection part of the intermediate bus is connected to the negative electrode of the previous group of single cells through a conductive connector, the positive electrode connection part of the intermediate bus is connected to the positive electrode of the next group of single cells through a conductive connector, and the negative output bus is connected to the negative electrode of the last group of single cells through a conductive connector.

6. The battery cell module according to claim 1, characterized in that: When multiple intermediate busbars are provided, the positive electrode connection portion of the battery cell of the previous intermediate busbar and the negative electrode connection portion of the battery cell of the subsequent intermediate busbar are insulated from each other and are stacked.

7. The battery cell module according to claim 6, characterized in that: The busbar structure is divided into an upper layer and a lower layer, the positive output pole busbar and the negative output pole busbar are distributed in the lower layer, and a plurality of intermediate busbars are alternately distributed in the upper layer and the lower layer in sequence.

8. The battery cell module according to any one of claims 1, 6 and 7, characterized in that: A plurality of battery core welding wire windows are provided on the positive output pole bus bar and / or the negative output pole bus bar and / or the intermediate bus bar.

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