Flexible measurement circuit board for side edge of battery cell tab of adaptive module and battery module

Abstract

The utility model relates to the technical field of battery modules, in particular to a flexible measuring circuit board matched with the side edge of a battery cell tab of a module and a battery module, which comprises a main circuit board distributed above a battery cell and led out from one end of the battery module; an avoiding branch is arranged on one side, close to the output tab, of the main circuit board, extends to the bottom of the battery cell along a gap between the battery cell and the output tab, and is connected with the tab of the battery cell through an acquisition nickel sheet. Aiming at the problem that a measuring circuit board in the prior art cannot be normally jointed with a tab from the upper side of a battery cell due to the interference problem of the tab of an output pole, an avoiding branch is arranged on one side, close to the output tab, of a main circuit board, and the avoiding branch extends to the bottom of the battery cell along a gap between the battery cell and the output tab; and the acquisition nickel sheet is connected with the lower tab of the battery cell, so that the interference problem of the output tab is avoided while the battery information is acquired.

Description

Technical Field

[0001] The utility model relates to the technical field of battery modules, and particularly relates to a flexible measurement circuit board and a battery module adapted to the side-out of the tab of the module battery cell. Background Art

[0002] A power battery pack refers to an integrated unit that packages a lithium-ion battery pack, a battery management system (BMS), and other necessary electrical components in a protective container. It is mainly used in electric vehicles and rechargeable battery systems to provide a power source and store energy. The main function of a power battery module is to store electrical energy and deliver the electrical energy to an electric motor, thereby driving a vehicle or powering other devices. Usually, to meet the requirements of the vehicle's power supply voltage and charge quantity, a large number of battery cells need to be integrated into the battery module and the tabs are connected in series and parallel through copper bars in a specific order for output.

[0003] For example, Figure 1 A typical battery module structure is shown. In this battery module structure, a plurality of long-strip battery cells A1 are arranged in sequence, and the battery tabs are distributed on the sides of the battery module and are connected in series and parallel through copper bars. At both ends of the long axis direction of the battery module, output tab A2 is respectively arranged, and the output tab A2 is usually connected to the copper bar of the outermost battery cell A1. When the side plates of the battery module are closed, the output tab A2 is exposed from the battery module and cooperates with a connector to form a power supply connection.

[0004] However, in the actual implementation process, the inventor found that to realize the state monitoring of each battery cell in the battery module, it is usually necessary to configure a collection circuit to collect the current on the line, etc. At this time, since the output tab is connected to the outermost battery cell, the tab of this battery cell will be blocked in the front view direction, resulting in the collection circuit being unable to be normally connected to the upper tab. Summary of the Utility Model

[0005] In view of the above problems existing in the prior art, the present invention provides a flexible measurement circuit board and a battery module adapted to the side-out of the tab of the module battery cell.

[0006] The specific technical solution is as follows:

[0007] A flexible measurement circuit board adapted to the side-out of the tab of the module battery cell, which is applicable to a battery module. The battery module includes a plurality of battery cells arranged in sequence along the long axis direction of the battery module. The battery module further includes two output tabs, and the output tabs are distributed at both ends of the long axis direction of the battery module;

[0008] The height of the output tab is higher than that of the battery cell;

[0009] The flexible measurement circuit board includes a pair of main circuit boards disposed on both the head and the tail sides of the battery cell;

[0010] Each of the main circuit boards is disposed above the battery cell and extends from one end of the battery module;

[0011] The main circuit board is provided with an avoidance branch on the side close to the output tab. The avoidance branch extends along the gap between the battery cell and the output tab to the bottom of the battery cell, and is connected to the tab of the battery cell through a collecting nickel sheet.

[0012] On the other hand, a plurality of measurement notches are also provided on the main circuit board, and one of the collecting nickel sheets is respectively disposed on each of the measurement notches. The collecting nickel sheet is connected to the tab of the battery cell.

[0013] On the other hand, the measurement notch is a U-shaped notch, and a nickel sheet slot extends from one side surface of the measurement notch. The collecting nickel sheet is inserted into the nickel sheet slot and fixed.

[0014] On the other hand, the collecting nickel sheet is rectangular, and a partition strip is provided in the middle of the collecting nickel sheet;

[0015] The upper side of the partition strip is inserted into the nickel sheet slot, and anti-slip lines are processed on the surface of the upper side of the partition strip;

[0016] The lower side of the partition strip is welded and fixed to the tab of the battery cell.

[0017] On the other hand, the positive tabs and the negative tabs of two adjacent battery cells are arranged staggeredly, and the measurement notches are respectively disposed on the side corresponding to the positive tabs.

[0018] On the other hand, a copper bar is lapped between the positive tab and the negative tab of adjacent battery cells.

[0019] On the other hand, a cubic accommodation space is provided above the battery cell in the battery module;

[0020] The main circuit board is in a long strip shape and is attached to the side wall of the accommodation space close to the outer shell of the battery module.

[0021] On the other hand, the flexible measurement circuit board is sequentially provided with a first polymer layer, a copper wire, and a second polymer layer in the section direction.

[0022] A battery module includes a plurality of battery cells, and the above flexible measurement circuit board is disposed in the battery module and is respectively connected to each battery cell.

[0023] The above technical solution has the following advantages or beneficial effects:

[0024] In the process of measuring the outermost battery cell in the battery module by the measurement circuit board in the prior art, due to the interference problem of the output pole tab, it is impossible to normally engage with the tab from the upper side of the battery cell. In this solution, an avoidance branch is provided on one side of the main circuit board close to the output pole tab. The avoidance branch extends along the gap between the battery cell and the output pole tab to the bottom of the battery cell, and the lower tab of the battery cell is connected through the acquisition nickel sheet, realizing the acquisition of battery information while avoiding the interference problem of the output pole tab. Brief Description of the Drawings

[0025] Refer to the accompanying drawings to more fully describe the embodiments of the present invention. However, the accompanying drawings are only for illustration and explanation, and do not constitute a limitation on the scope of the present invention.

[0026] Figure 1 Schematic diagram of the prior art;

[0027] Figure 2 Overall schematic diagram of the embodiment of the present invention;

[0028] Figure 3 Overall schematic diagram of the embodiment of the present invention;

[0029] Figure 4 Partial schematic diagram of the measurement notch in the embodiment of the present invention. Detailed Description of the Invention

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0032] The following further illustrates the present invention with reference to the accompanying drawings and specific embodiments, but does not limit the present invention.

[0033] The present invention includes:

[0034] A flexible measurement circuit board adapted to the side-out of the tab of the module battery cell, applicable to a battery module, as Figure 2 、 Figure 3 shown, the battery module includes a plurality of battery cells 1, two output pole tabs 2 and a flexible measurement circuit board 3;

[0035] The battery cells 1 are arranged in sequence along the long axis direction of the battery module, and the output tabs 2 are distributed at both ends of the battery module in the long axis direction;

[0036] The height of the output tab 2 is higher than that of the battery cell;

[0037] The flexible measurement circuit board 3 includes a pair of main circuit boards 31 disposed on both the head and tail sides of the battery cell 1;

[0038] Each of the main circuit boards 31 is disposed above the battery cell 1 and leads out from one end of the battery module;

[0039] The main circuit board 31 is provided with an avoidance branch 32 on the side close to the output tab 2. The avoidance branch 32 extends along the gap between the battery cell 1 and the output tab 2 to the bottom of the battery cell 1, and is connected to the tab of the battery cell through a collection nickel sheet 4.

[0040] Specifically, in view of the problem that in the prior art, during the measurement of the outermost battery cell in the battery module, the measurement circuit board cannot be normally joined to the tab from the upper side of the battery cell due to the interference problem of the output tab. In this solution, an avoidance branch 32 is provided on the side of the main circuit board 31 close to the output tab 2. The avoidance branch 32 extends along the gap between the battery cell 1 and the output tab 2 to the bottom of the battery cell 1, and is connected to the lower tab of the battery cell 1 through a collection nickel sheet 4, realizing the acquisition of battery information while avoiding the interference problem of the output tab 2.

[0041] Specifically, the battery cell 1 involved in the above embodiment is a long cubic battery cell obtained by encapsulating one or more strip-shaped battery cells, and its tabs are led out from the end faces in the long axis direction of the battery cell 1. According to different encapsulation forms, the positive tab and the negative tab may be arranged on the same side or on different sides of the battery cell 1.

[0042] For example, in one embodiment, the side of the battery cell 1 is rectangular and is vertically placed in the battery module. The positive tab and the negative tab are arranged on the same side of the battery cell 1, and the positive tab and the negative tab are arranged one above the other.

[0043] Correspondingly, in this embodiment, the output copper bars are also arranged in two groups according to the arrangement of the positive tab and the negative tab, and are arranged up and down in the battery module.

[0044] In another embodiment, the side of the battery cell 1 is rectangular and is vertically placed in the battery module. The positive tab and the negative tab are arranged on both sides of the battery cell 1. The positive tab is arranged on one side of the battery cell 1, and the negative tab is arranged on the other side of the battery cell 1.

[0045] The output tabs 2 are used as the output positive and negative electrodes of the overall battery module. After connecting each cell 1 in series through a copper bar inside the battery module, they are connected to both ends of the copper bar to form a circuit. Part of the output tabs 2 is located outside the battery module and is used to connect external power supply connectors.

[0046] Among them, to achieve a shorter output path, in this embodiment, the output tabs 2 are selected to be arranged on the same side, and the output tabs 2 are located on the upper side of the cell 1 near the battery tab. Since the output tabs 2 are in a cubic structure, they will block the battery tabs to a certain extent at this position.

[0047] The flexible measurement circuit board is a circuit board used to measure and output parameters of each cell in the battery module. Its essence is to connect to the tabs of the cell 1 through the circuit board, thereby sensing the current, voltage, etc. on the line, and then outputting to the battery management system (BMS) or the slave battery management system (CSC), etc. outside the battery module through relevant interfaces, and then the battery management system measures to obtain actual data.

[0048] In one embodiment, a cubic accommodation space is provided above the cell 1 in the battery module;

[0049] The main circuit board 31 is in a long strip shape and is attached to the side wall of the accommodation space close to the outer shell of the battery module.

[0050] Specifically, usually in order to achieve better battery safety in the battery module, corresponding structures will be arranged in the battery module, including a reinforcing beam for anti-collision, an exhaust channel for discharging high-pressure gas when the battery is in thermal runaway, and a circulating water path for thermal management of the battery, etc. To achieve better integration of such structures to improve volume efficiency, a cubic accommodation space is provided above the cell 1.

[0051] At this time, to achieve the proximity collection of the cell 1 and reduce the occupation of volume, the main circuit board 31 in the flexible measurement circuit board is selected to be a long-strip packaged circuit board and is attached to the side wall of the accommodation space close to the outer shell of the battery module.

[0052] Multiple leads are arranged along the plane of the package in the long-strip packaged circuit board to connect each cell 1 respectively.

[0053] In one embodiment, as Figure 4 shown, multiple measurement notches 33 are also provided on the main circuit board 31, and a collection nickel sheet 4 is respectively arranged on the measurement notches 33, and the collection nickel sheet 4 is connected to the tab of the cell 1.

[0054] Specifically, to measure the voltage of the battery cell 1, in this embodiment, corresponding measurement notches are opened on the main circuit board 31 for the battery cell 1 to be measured, and then a collection nickel sheet 4 is respectively arranged on each measurement notch 33, and the collection nickel sheet 4 is connected to the tab of the battery cell 1.

[0055] The design of the measurement notch 33 can shorten the length of the circuit board required for the collection nickel sheet 4.

[0056] Furthermore, the flexible measurement circuit board 3 is sequentially provided with a first polymer layer, copper wires, and a second polymer layer in the cross-sectional direction.

[0057] Specifically, to achieve a more compact wiring process, in this embodiment, a flexible circuit board is used to construct the flexible measurement circuit board 3.

[0058] Among them, the flexible measurement circuit board 3 is sequentially provided with a first polymer layer, copper wires, and a second polymer layer in the cross-sectional direction. During the preparation process, first, according to the designed circuit board wiring, copper wires are printed on the first polymer layer as the base as the wiring layer, and then the second polymer layer is laminated on the wiring layer.

[0059] In one embodiment, the measurement notch 33 is a U-shaped notch, and a nickel sheet slot extends from one side of the measurement notch 33, and the collection nickel sheet 4 is inserted into the nickel sheet slot and fixed.

[0060] Specifically, based on the above-designed flexible measurement circuit board 3, by opening a measurement notch in the main circuit board 31 and then digging out the nickel sheet slot, the collection nickel sheet 34 can be inserted into the nickel sheet slot and fixed.

[0061] The nickel sheet slot is essentially a polymer slot extended from the first and second polymer layers. The collection nickel sheet 4 is inserted into the nickel sheet slot and connected to the internal copper wires.

[0062] In one embodiment, the collection nickel sheet 4 is rectangular, and a partition strip 41 is arranged in the middle of the collection nickel sheet 4;

[0063] The upper side of the partition strip 41 is inserted into the nickel sheet slot, and anti-slip patterns are processed on the surface of the upper side of the partition strip 41;

[0064] The lower side of the partition strip 41 is welded and fixed to the tab of the battery cell.

[0065] In one embodiment, the positive tabs and negative tabs of two adjacent battery cells 1 are arranged in a staggered manner, and the measurement notches 33 are respectively arranged on one side corresponding to the positive tabs.

[0066] In one embodiment, a copper bar is lapped between the positive tab and the negative tab of adjacent battery cells 1.

[0067] Specifically, to achieve a relatively compact layout of the battery module, in this embodiment, for the battery cells 1 with tabs distributed on both sides, the positive and negative electrodes are respectively arranged in an alternating manner, and then copper bars are lapped between the positive tabs and the negative tabs to form a series circuit. At this time, the measurement notch 33 should be set above the side corresponding to the positive tab.

[0068] The above are only the preferred embodiments of the present invention, and do not limit the implementation manners and protection scope of the present invention accordingly. For those skilled in the art, it should be able to realize that the solutions obtained by equivalent substitution and obvious changes made by using the specification and illustrated content of the present invention should be included in the protection scope of the present invention.

Claims

1. A flexible measurement circuit board adapted for the side-out of the tab of the module battery cell, applicable to a battery module, the battery module including a plurality of battery cells arranged in sequence along the long axis direction of the battery module, characterized in that, The battery module further includes two output tabs, which are distributed at both ends of the battery module in the long axis direction; The height of the output tab is higher than that of the battery cell; The flexible measurement circuit board includes a pair of main circuit boards arranged on both sides of the head and tail of the battery cell; Each of the main circuit boards is arranged above the battery cell and leads out from one end of the battery module; The main circuit board is provided with an avoidance branch on the side close to the output tab. The avoidance branch extends along the gap between the battery cell and the output tab to the bottom of the battery cell, and connects the tab of the battery cell through a collecting nickel sheet.

2. The flexible measurement circuit board according to claim 1, wherein The main circuit board is also provided with a plurality of measurement notches, and a collecting nickel sheet is respectively arranged on each of the measurement notches, and the collecting nickel sheet connects the tab of the battery cell.

3. The flexible measurement circuit board according to claim 2, characterized in that, The measurement notch is a U-shaped notch, and a nickel sheet slot extends from one side surface of the measurement notch. The collecting nickel sheet is inserted into the nickel sheet slot and fixed.

4. The flexible measurement circuit board according to claim 3, wherein The collecting nickel sheet is rectangular, and a partition strip is arranged in the middle of the collecting nickel sheet; The upper side of the partition strip is inserted into the nickel sheet slot, and anti-slip lines are processed on the surface of the upper side of the partition strip; The lower side of the partition strip is welded and fixed to the tab of the battery cell.

5. The flexible measurement circuit board according to claim 2, characterized in that, The positive tabs and negative tabs of two adjacent battery cells are arranged staggeredly, and the measurement notches are respectively arranged on the side corresponding to the positive tab.

6. The flexible measurement circuit board according to claim 5, characterized in that, A copper bar is lapped between the positive tab and the negative tab of the adjacent battery cells.

7. The flexible measurement circuit board according to claim 1, wherein The battery module is provided with a cubic accommodating space above the battery cell; The main circuit board is strip-shaped and attached to the side wall of the accommodating space close to the outer shell of the battery module.

8. The flexible measurement circuit board according to claim 1, wherein The flexible measurement circuit board is sequentially provided with a first polymer layer, a copper wire and a second polymer layer in the cross-sectional direction.

9. A battery module, characterized in that, The battery module includes a plurality of battery cells, and the flexible measurement circuit board as described in any one of claims 1-8 is arranged in the battery module to connect each of the battery cells respectively.

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