Signal acquisition assembly, battery pack and energy storage equipment

Abstract

The utility model provides a signal acquisition assembly, a battery pack and energy storage equipment, the battery pack comprises a battery cell, the battery cell is provided with a pole, and the signal acquisition assembly comprises a busbar and an acquisition sheet. The busbar is attached to the battery cell and provided with a first through hole, and the first through hole exposes the pole. The acquisition piece comprises a first welding part, the first welding part is attached to one side, back on to the battery core, of the busbar, the first welding part is provided with a second through hole, the second through hole is communicated with the first through hole, and the second through hole exposes the pole and the busbar. The first welding part, the busbar and the pole are sequentially connected, the busbar is provided with the first through hole, the first welding part is provided with the second through hole, the pole is exposed out of the first through hole, and the pole and the busbar are exposed out of the second through hole, so that the first welding part, the busbar and the pole can be simultaneously welded through the first through hole and the second through hole during welding; therefore, the first welding part, the busbar and the battery cell can be welded together through one-time welding operation, two-time repeated welding operation is avoided, and the production efficiency is further improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage batteries, and specifically to a signal acquisition component, a battery pack, and an energy storage device. Background Art

[0002] At present, in the processing technology of the signal acquisition integrated component of the battery module, multiple battery cells are connected in series or in parallel through a bus, and the bus is connected to the acquisition circuit board through a nickel sheet. The acquisition circuit board is used to collect the voltage and / or current of the battery cell. Among them, the pole of the battery cell is connected to the bus by welding, and the nickel sheet is also connected to the bus by welding. When welding, it is necessary to weld the pole of the battery cell and the bus separately first, and then weld the nickel sheet and the bus separately. The welding operation needs to be repeated twice. After welding, it is necessary to repeat twice to check whether the solder joints are detached, which leads to complicated operation and low production efficiency. Utility Model Content

[0003] In view of this, the present application provides a signal acquisition component, a battery pack and an energy storage device that can improve production efficiency.

[0004] In one embodiment of the present application, a signal acquisition component is provided, which is applied to a battery pack, wherein the battery pack includes a battery cell, and the battery cell has a pole. The signal acquisition component includes a bus and a collection sheet. The bus is configured to fit the battery cell, and the bus is provided with a first through hole, and the first through hole is configured to expose the pole. The collection sheet includes a first welding portion, and the first welding portion is attached to the side of the bus that is away from the battery cell, and the first welding portion is provided with a second through hole, and the second through hole is connected to the first through hole, and the second through hole is configured to expose the pole and the bus, so as to weld the battery cell, the bus and the first welding portion.

[0005] In the signal acquisition component provided by the present application, the first welding part, the bus and the pole are connected in sequence, the bus is provided with a first through hole, the first welding part is provided with a second through hole, the first through hole exposes the pole, and the second through hole exposes the pole and the bus, so that during welding, the first welding part, the bus and the pole can be welded simultaneously through the first through hole and the second through hole, so that the first welding part, the bus and the battery cell can be welded together through one welding operation, and only one welding quality inspection operation is required after welding, avoiding two repeated welding operations and two repeated welding quality inspection operations, thereby improving production efficiency.

[0006] In some embodiments, the signal acquisition component also includes an acquisition circuit board, the acquisition sheet also includes a second welding portion, the acquisition circuit board is connected to the second welding portion, the acquisition circuit board is arranged on the side of the first welding portion facing away from the bus, the acquisition circuit board is provided with a avoidance opening, and the avoidance opening is configured to expose the first welding portion, the bus and the pole.

[0007] In some embodiments, the acquisition sheet further includes a connecting portion, which is connected between the first welding portion and the second welding portion, the second welding portion is welded to a side of the acquisition circuit board facing away from the first welding portion, and the connecting portion passes through the avoidance opening.

[0008] In some embodiments, there are multiple buses, and the collection circuit board is provided with multiple avoidance openings, the number of the avoidance openings is equal to or greater than the number of buses, and each bus, the first welding portion and the portion where the pole is welded are exposed through a corresponding avoidance opening.

[0009] In some embodiments, the first welding portion and the second welding portion are parallel, and the connecting portion is perpendicular to the first welding portion and the second welding portion.

[0010] In some embodiments, the busbar is provided with a first through hole, the busbar is connected to a plurality of battery cells, and a pole of one of the plurality of battery cells is exposed through the first through hole.

[0011] In some embodiments, the first welding portion includes a main body and a protrusion connected to each other, the second through hole is disposed in the main body, the protrusion is disposed between an edge of the second through hole and an edge of the first through hole, and the protrusion is configured to be welded to the busbar.

[0012] In some embodiments, the second through hole is a circular hole, and a plurality of protrusions are provided, and the plurality of protrusions are evenly distributed around the center of the second through hole.

[0013] In one embodiment of the present application, a battery pack is further provided, comprising a battery cell holder, a battery cell and a signal acquisition component according to any of the above embodiments, wherein the battery cell and the signal acquisition component are arranged on the battery cell holder, and the signal acquisition component is configured to acquire signals from the battery cell.

[0014] In one embodiment of the present application, an energy storage device is also provided. The energy storage device includes a housing, an inverter module and the above-mentioned battery pack. The battery pack is connected to the inverter module, and the battery pack and the inverter module are arranged in the housing.

[0015] In the battery pack and energy storage device provided by the present application, the first welding part, the bus and the pole in the above-mentioned signal acquisition component are connected in sequence, the bus is provided with a first through hole, the first welding part is provided with a second through hole, the first through hole exposes the pole, and the second through hole exposes the pole and the bus, so that during welding, the solder can enter the first through hole and the second through hole to weld the first welding part, the bus and the pole at the same time, so that the first welding part, the bus and the battery cell can be welded together through one welding operation, and only one welding quality inspection operation is required after welding, thereby avoiding two repeated welding operations and two repeated welding quality inspection operations, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of an energy storage device in one embodiment of the present application.

[0017] Figure 2 It is a three-dimensional diagram of a battery pack in one embodiment of the present application.

[0018] Figure 3 for Figure 2 A three-dimensional image of the battery pack from another perspective.

[0019] Figure 4 for Figure 2 Exploded view of the battery pack.

[0020] Figure 5 for Figure 4 Enlarged view of the V in the middle.

[0021] Figure 6 for Figure 2 A three-dimensional diagram of the signal acquisition component and battery cell.

[0022] Figure 7 for Figure 6 A three-dimensional image of the signal acquisition component and battery cell from another perspective.

[0023] Main component symbols

[0024] 100- signal acquisition component 10- bus 11- first through hole

[0025] 20-collection sheet 21-first welding part 211-second through hole

[0026] 212-main body 213-protrusion 22-second welding part

[0027] 23-connection part 30-collection circuit board 31-avoidance port

[0028] 200-battery pack 201-cell support 202-through slot

[0029] 300-Energy storage device 301-Shell 400-Battery core

[0030] 401 - pole 12 - third through hole. DETAILED DESCRIPTION

[0031] The technical solution of the present application will be described below in conjunction with the drawings in the implementation modes of the present application. Obviously, the described implementation modes are only part of the implementation modes of the present application, rather than all the implementation modes.

[0032] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more of the related listed items.

[0034] At present, in the processing technology of the signal acquisition integrated component of the battery module, multiple battery cells are connected in series or in parallel through a bus, and the bus is connected to the acquisition circuit board through a nickel sheet. The acquisition circuit board is used to collect the voltage and / or current of the battery cell. Among them, the pole of the battery cell is connected to the bus by welding, and the nickel sheet is also connected to the bus by welding. When welding, it is necessary to weld the pole of the battery cell and the bus separately first, and then weld the nickel sheet and the bus separately. The welding operation needs to be repeated twice. After welding, it is necessary to repeat twice to check whether the solder joints are detached, which leads to complicated operation and low production efficiency.

[0035] In view of this, the present application provides a signal acquisition component, a battery pack and an energy storage device that can improve production efficiency. The battery pack includes a battery cell, and the battery cell has a pole. The signal acquisition component includes a bus and a collection sheet. The bus is configured to fit the battery cell, and the bus is provided with a first through hole, and the first through hole is configured to expose the pole. The collection sheet includes a first welding portion, the first welding portion is attached to the side of the bus that is away from the battery cell, the first welding portion is provided with a second through hole, the second through hole is connected to the first through hole, and the second through hole is configured to expose the pole and the bus, so as to weld the battery cell, the bus and the first welding portion.

[0036] In the signal acquisition component provided by the present application, the first welding part, the bus and the pole are connected in sequence, the bus is provided with a first through hole, the first welding part is provided with a second through hole, the first through hole exposes the pole, and the second through hole exposes the pole and the bus, so that during welding, the first welding part, the bus and the pole can be welded simultaneously through the first through hole and the second through hole, so that the first welding part, the bus and the battery cell can be welded together through one welding operation, and only one welding quality inspection operation is required after welding, avoiding two repeated welding operations and two repeated welding quality inspection operations, thereby improving production efficiency.

[0037] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0038] See also Figure 1 and Figure 2 In the embodiment of the present application, a signal acquisition component 100, a battery pack 200 and an energy storage device 300 are provided. The battery pack 200 includes a signal acquisition component 100 and at least one battery cell 400. The signal acquisition component 100 is used to collect signals from the battery cell 400, such as voltage or current signals. As an example, the signal acquisition component 100 is used to collect voltage signals from the battery cell 400. The energy storage device 300 includes an inverter module (not shown) and a battery pack 200. The inverter module is electrically connected to the battery pack 200. The inverter module can convert the direct current of the battery pack 200 into alternating current for use by the power load, and can also convert the alternating current of the power grid into direct current to charge the battery pack 200. As an illustrative example, the energy storage device 300 can be a portable power supply used in outdoor scenes, a household energy storage power supply for household energy storage, or an industrial and commercial energy storage power supply, etc.

[0039] See also Figures 3 to 5In some embodiments, the signal acquisition component 100 includes a busbar 10 and a acquisition sheet 20. Each battery cell 400 has a pole 401. The busbar 10 is located on the side of the battery cell 400 having the pole 401. The busbar 10 is attached to at least one pole 401 so that the busbar 10 is electrically connected to the pole 401. The busbar 10 is provided with a first through hole 11, and the first through hole 11 exposes a pole 401 attached to the busbar 10. The acquisition sheet 20 includes a first welding portion 21, and the first welding portion 21 is attached to the side of the busbar 10 facing away from the battery cell 400. The first welding portion 21 is provided with a second through hole 211, and the second through hole 211 is connected to the first through hole 11. The second through hole 211 not only exposes the busbar 10, but also exposes the pole 401 exposed through the first through hole 11, that is, the pole 401 attached to the busbar 10 is exposed through the first through hole 11 and the second through hole 211 at the same time. When welding the collection sheet 20, the bus bar 10 and the pole 401, since the pole 401 is exposed through the first through hole 11 and the second through hole 211, and the bus bar 10 is exposed through the second through hole 211, the first welding portion 21, the bus bar 10 and the pole 401 can be welded at the same time, so that the collection sheet 20, the bus bar 10 and the battery cell 400 can be welded together through one welding operation, avoiding the repeated welding operations of first welding the bus bar 10 and the battery cell 400 separately and then welding the collection sheet 20 and the bus bar 10 separately. After welding, only one welding quality inspection operation is required, avoiding the repeated welding operations of first inspecting the welding point quality of the bus bar 10 and the battery cell 400 and then inspecting the welding point quality of the collection sheet 20 and the bus bar 10 separately, thereby improving production efficiency.

[0040] In some embodiments, the signal acquisition component 100 further includes an acquisition circuit board 30, which is disposed on the side of the first welding portion 21 facing away from the bus 10, and the acquisition sheet 20 further includes a second welding portion 22, which is electrically connected to the acquisition circuit board 30, so that the acquisition circuit board 30 can be electrically connected to the bus 10 through the acquisition sheet 20, thereby electrically connecting the battery cell 400. The acquisition circuit board 30 is used to acquire and process signals such as voltage or current of the battery cell 400.

[0041] In some embodiments, the signal acquisition component 100 further includes a battery management system circuit board (BMS), and the acquisition circuit board 30 is electrically connected to the battery management system circuit board. The battery management system circuit board is used to receive the signal of the battery cell 400 acquired by the acquisition circuit board 30, implement the battery management function, and prevent the battery cell 400 from abnormal conditions such as over-discharge, over-charge, and over-temperature. Of course, in some other embodiments, the acquisition circuit board 30 is the battery management system circuit board, which reduces the number of circuit boards and reduces space occupancy.

[0042] In some embodiments, the battery pack 200 includes a plurality of battery cells 400, the signal acquisition assembly 100 includes a plurality of busbars 10 and a plurality of acquisition sheets 20, and the plurality of battery cells 400 are connected in series or in parallel through the plurality of busbars 10, wherein each busbar 10 is attached to the poles 401 of two or more battery cells 400, one pole 401 of the plurality of poles 401 attached to each busbar 10 is exposed through a first through hole 11, and each busbar 10 is electrically connected to the acquisition circuit board 30 through a acquisition sheet 20. For example, each busbar 10 is attached to the poles 401 of two battery cells 400, one of the two poles 401 is exposed through the first through hole 11 and is welded to the first welding portion 21 of the acquisition sheet 20.

[0043] In some embodiments, among the multiple poles 401 attached to the busbar 10, the poles 401 not exposed through the first through hole 11 are electrically connected to the busbar 10 in the following manner: the busbar 10 further includes a third through hole 12, the poles 401 not exposed through the first through hole 11 are exposed through the third through hole 12, and the poles 401 and the busbar 10 are welded at the third through hole 12, thereby achieving electrical connection between the busbar 10 and the poles 401. Further optionally, the first through hole 11 and the third through hole 12 have the same structure, so that there is no need to distinguish between the first through hole 11 and the third through hole 12 during use, thereby improving production efficiency.

[0044] In some embodiments, the collection circuit board 30 is provided with a plurality of avoidance openings 31, each avoidance opening 31 is used to expose the first welding portion 21, the bus bar 10 and the portion of the pole 401 that needs to be welded, so as to avoid the welding tools during welding and provide operating space for the welding operation.

[0045] In some embodiments, the number of the plurality of avoidance openings 31 is the same as the number of the bus bars 10; or, the number of the plurality of avoidance openings 31 is greater than the number of the bus bars 10, and the redundant avoidance openings 31 can be reserved to allow the number of the bus bars 10 to be increased later.

[0046] In some embodiments, the collection circuit board 30 is provided with a position avoidance opening 31 corresponding to each pole 401, so that a collection sheet 20 can be added at any time at the position of any pole 401. Further optionally, since the joint between each pole 401 and the bus bar 10 is provided with a first through hole 11 or a third through hole 12 of the same structure, when adding a collection sheet 20, the first welding portion 21, the bus bar 10 and the pole 401 can be welded simultaneously through one welding operation to improve the working efficiency.

[0047] In some embodiments, the second welding portion 22 is connected to the acquisition circuit board 30 by welding. During welding, due to assembly restrictions, the acquisition circuit board 30 is located on the side of the first welding portion 21 facing away from the bus 10. Therefore, the second welding portion 22 is welded to the side of the acquisition circuit board 30 facing away from the first welding portion 21, so that the welding tool can weld the second welding portion 22 and the acquisition circuit board 30.

[0048] See also Figure 4 , Figure 6 and Figure 7 In some embodiments, the acquisition sheet 20 further includes a connecting portion 23, which is connected between the first welding portion 21 and the second welding portion 22. The connecting portion 23 passes through the avoidance opening 31, so that the second welding portion 22 can be located on the side of the acquisition circuit board 30 facing away from the bus 10 for welding.

[0049] In some embodiments, the first welding portion 21, the connecting portion 23 and the second welding portion 22 are all in sheet shape, the first welding portion 21 and the second welding portion 22 are parallel, and the connecting portion 23 is perpendicular to the first welding portion 21 and the second welding portion 22, so as to facilitate the processing of the collection sheet 20. As an illustrative example, the collection sheet 20 is a nickel sheet, and the first welding portion 21, the connecting portion 23 and the second welding portion 22 are processed and formed by sheet metal processing. It can be understood that in some other embodiments, the first welding portion 21 and the second welding portion 22 may not be parallel, and the connecting portion 23 may also have a desired angle with the first welding portion 21 and the second welding portion 22 to adapt to different welding positions.

[0050] In some embodiments, the first welding portion 21 includes a main body 212 and a protrusion 213 connected to each other, the second through hole 211 is provided in the main body 212, the size of the first through hole 11 is smaller than the size of the second through hole 211, the protrusion 213 is provided between the edge of the second through hole 211 and the edge of the first through hole 11, the protrusion 213 is used to be welded with the busbar 10 and the pole 401, and can play a role in positioning the first welding portion 21 during the welding operation. As an illustrative example, when welding, a welding ring (i.e., welding ring) is required as solder and laser welding is performed. During laser welding, the welding ring is located between the edge of the second through hole 211 and the edge of the first through hole 11, the welding ring presses the protrusion 213, the laser melts the welding ring, and the melted solder flows downward into the first through hole 11 and contacts the pole 401, thereby welding the protrusion 213, the busbar 10 and the pole 401.

[0051] In some embodiments, the second through hole 211 and the first through hole 11 are both circular holes, the diameter of the first through hole 11 is smaller than the diameter of the second through hole 211, and a plurality of protrusions 213 are provided, and the plurality of protrusions 213 are evenly distributed around the center of the second through hole 211, so that the welding of the first welding portion 21 with the busbar 10 and the pole 401 is more uniform, so as to improve the connection stability. For example, there are two protrusions 213, and the two protrusions 213 are arranged opposite to each other, or there are three protrusions 213, and the three protrusions 213 are evenly distributed and arranged 120 degrees apart.

[0052] In some embodiments, the pole 401 may extend into the first through hole 11 of the busbar 10 or even extend out of the first through hole 11 , as long as the first welding portion 21 , the busbar 10 and the pole 401 can be welded together simultaneously during welding.

[0053] In some embodiments, the size of the first through hole 11 can be adapted to the size of the pole 401, so that the pole 401 can be embedded in the first through hole 11, thereby improving the connection stability between the busbar 10 and the pole 401. The size of the first through hole 11 can also be larger than the size of the pole 401 to facilitate the assembly and alignment of the first through hole 11 and the pole 401.

[0054] In some embodiments, the sizes of the second through hole 211 and the first through hole 11 can be the same, and the protrusion 213 can also be eliminated, as long as the molten solder can flow into the second through hole 211 and the first through hole 11 in sequence during welding, and at the same time connect the first welding part 21, the bus 10 and the pole 401 to each other in a conductive manner.

[0055] In some embodiments, in the first welding portion 21 , the second through hole 211 of the main body 212 may also be replaced by a slot structure as long as the busbar 10 and the pole 401 are exposed.

[0056] See also Figure 4 In some embodiments, the battery pack 200 further includes a cell holder 201, which is used to accommodate and fix the cell 400 and the signal acquisition component 100. The multiple cells 400 are columnar and arranged in parallel in the cell holder 201, and the poles 401 of the multiple cells 400 are all facing the same side. The cell holder 201 is provided with multiple through slots 202 on one side close to the pole 401, and each through slot 202 exposes a corresponding pole 401, so that the pole 401 fits with the bus 10.

[0057] See also Figure 1 In some embodiments, the energy storage device 300 further includes a shell 301 , and the inverter module and the battery pack 200 are both disposed in the shell 301 , and the shell 301 is used to accommodate and protect the inverter module and the battery pack 200 .

[0058] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present application and are not intended to be limiting of the present application. As long as they are within the spirit and scope of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A signal acquisition component, applied to a battery pack, wherein the battery pack comprises a battery cell, and the battery cell has a pole, characterized in that: The signal acquisition component comprises: A busbar, the busbar being configured to fit the battery cell, the busbar being provided with a first through hole, the first through hole being configured to expose the pole; and The collecting sheet includes a first welding portion, the first welding portion is attached to the side of the bus bar facing away from the battery cell, the first welding portion is provided with a second through hole, the second through hole is connected to the first through hole, and the second through hole is configured to expose the pole and the bus bar so as to weld the battery cell, the bus bar and the first welding portion.

2. The signal acquisition component according to claim 1, characterized in that: The signal acquisition component also includes an acquisition circuit board, and the acquisition piece also includes a second welding portion. The acquisition circuit board is connected to the second welding portion. The acquisition circuit board is arranged on the side of the first welding portion facing away from the bus. The acquisition circuit board is provided with a avoidance opening, and the avoidance opening is configured to expose the first welding portion, the bus and the pole.

3. The signal acquisition component according to claim 2, characterized in that: The acquisition sheet also includes a connecting portion, which is connected between the first welding portion and the second welding portion, the second welding portion is welded to a side of the acquisition circuit board facing away from the first welding portion, and the connecting portion passes through the avoidance opening.

4. The signal acquisition component according to claim 2, characterized in that: There are multiple busbars, and the acquisition circuit board is provided with multiple avoidance openings, the number of the avoidance openings is equal to or greater than the number of the busbars, and each of the busbars, the first welding portion and the portion where the poles are welded are exposed through a corresponding avoidance opening.

5. The signal acquisition component according to claim 3, characterized in that: The first welding portion and the second welding portion are parallel to each other, and the connecting portion is perpendicular to the first welding portion and the second welding portion.

6. The signal acquisition component according to any one of claims 1 to 5, characterized in that: The busbar is provided with a first through hole, and the busbar is connected to a plurality of the battery cells, and the pole of one of the battery cells is exposed through the first through hole.

7. The signal acquisition component according to any one of claims 1 to 5, characterized in that: The first welding portion includes a main body and a protrusion connected to each other, the second through hole is provided in the main body, the protrusion is provided between an edge of the second through hole and an edge of the first through hole, and the protrusion is configured to be welded to the busbar.

8. The signal acquisition component according to claim 7, characterized in that: The second through hole is a circular hole, and a plurality of protrusions are provided, and the plurality of protrusions are evenly distributed around the center of the second through hole.

9. A battery pack, characterized in that: The battery pack includes a cell holder, a cell, and a signal acquisition component according to any one of claims 1 to 8, wherein the cell and the signal acquisition component are disposed on the cell holder, and the signal acquisition component is configured to acquire signals from the cell.

10. An energy storage device, characterized in that: The energy storage device comprises a housing, an inverter module and a battery pack as claimed in claim 9, wherein the battery pack is connected to the inverter module, and the battery pack and the inverter module are arranged in the housing.

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