A residual magnetism eliminating structure for a battery pack

Abstract

The application belongs to the technical field of storage batteries, and discloses a residual magnetic moment eliminating structure of a storage battery pack, which comprises a first battery pack and a second battery pack symmetrically arranged with an XY plane as a mirror plane, so that the current paths on the first printed circuit board and the second printed circuit board are consistent, the magnetic ring areas are equal, the current sizes are equal, and the current directions are opposite, therefore, the dynamic residual magnetic moments in the XY plane generated by the currents on the first printed circuit board and the second printed circuit board can be offset, so that the residual magnetic moment of the storage battery pack is effectively reduced, the external magnetic interference of the storage battery pack is reduced, the continuous disturbance of the residual magnetic moment on a satellite attitude control system is avoided, the satellite attitude control precision is significantly improved, the frequency of high-frequency magnetic unloading operation of a magnetic moment device is reduced, the satellite energy loss is reduced, and the in-orbit service life of the satellite is effectively prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a structure for eliminating residual magnetic moment in a battery pack. Background Technology

[0002] The battery pack is the core energy storage and supply equipment for satellite operation in orbit. The residual magnetic moment of the battery pack is one of the main sources of interference that restricts high-precision satellite attitude control. The residual magnetic moment of the battery pack includes static residual magnetic moment and dynamic residual magnetic moment. The static residual magnetic moment is generated by the inherent magnetization characteristics of the ferromagnetic components of the battery, while the dynamic residual magnetic moment is formed by the superposition of the static residual magnetic moment and the magnetic field of the charging and discharging circuit current. Together, they constitute the continuous magnetic interference torque of the satellite.

[0003] The residual magnetic moment couples with the Earth's magnetic field, continuously disturbing the satellite's attitude, increasing attitude control errors, and severely affecting the execution accuracy of precision space missions such as high-precision remote sensing and magnetic detection. To counteract the disturbing torque caused by the residual magnetic moment, the satellite's magnetoresistor needs to be frequently activated to perform magnetic unloading operations, which greatly consumes the satellite's limited on-orbit energy and shortens the satellite's overall service life.

[0004] Therefore, there is an urgent need to propose a structure for eliminating the residual magnetic moment of a battery pack in order to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this invention is to provide a battery pack residual magnetic moment elimination structure to reduce the residual magnetic moment of the battery pack, reduce external magnetic interference from the battery pack, and improve the satellite attitude control accuracy.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A residual magnetic moment elimination structure for a battery pack, wherein the X, Y, and Z directions are mutually perpendicular, and the residual magnetic moment elimination structure for the battery pack includes:

[0008] The first battery pack includes a first printed circuit board and a plurality of first cells. The plurality of first cells are arranged in an array. The first printed circuit board is parallel to the XY plane and is disposed above each of the first cells. The first positive electrode tab and the first negative electrode tab of each of the first cells extend upward and are electrically connected to the first printed circuit board.

[0009] The second battery pack is stacked below the first battery pack along the Z direction. The second battery pack includes a second printed circuit board and a plurality of second cells. The plurality of second cells are arranged in an array. The second printed circuit board is parallel to the XY plane and is disposed below each of the second cells. The second positive electrode tab and the second negative electrode tab of each of the second cells extend downward and are electrically connected to the second printed circuit board.

[0010] The first battery cell and the second battery cell are one-to-one and are symmetrically arranged with the XY plane as a mirror plane. The conductive circuits on the first printed circuit board and the second printed circuit board are symmetrically arranged with the XY plane as a mirror plane, and the current directions on the first printed circuit board and the second printed circuit board are opposite.

[0011] In some optional embodiments, the first positive electrode tab on each first cell and the second positive electrode tab on the corresponding second cell are arranged symmetrically with the XY plane as a mirror plane, and the first negative electrode tab on each first cell and the second negative electrode tab on the corresponding second cell are arranged symmetrically with the XY plane as a mirror plane.

[0012] In some alternative embodiments, the first positive electrode tab and the first negative electrode tab are both led out from the top surface of the first battery cell, and the second positive electrode tab and the second negative electrode tab are both led out from the bottom surface of the second battery cell.

[0013] In some optional embodiments, the plurality of first cells and the plurality of second cells are arranged in an M-row × N-column array, wherein M≥2 and N≥2;

[0014] Each of the first cells in the same column is connected in series to form a first series branch, and each of the first series branches is connected in parallel to each other.

[0015] Each of the second cells in the same column is connected in series to form a second series branch, and each of the second series branches is connected in parallel.

[0016] In some alternative embodiments, M is 13 and N is 8.

[0017] In some optional embodiments, both the first cell and the second cell include an aluminum alloy casing; and / or,

[0018] Both the first and second battery cells are square cells.

[0019] In some optional embodiments, the battery pack residual magnetic moment elimination structure further includes a first mounting plate, which is disposed on the top of the first battery pack and is used to support the first printed circuit board. The first mounting plate has a through-hole first positioning groove, which corresponds one-to-one with the first battery cell and is shape-fitted. The top of the first battery cell is inserted into the first positioning groove, and the first positive electrode tab and the first negative electrode tab can pass through the first positioning groove and connect to the first printed circuit board; and / or,

[0020] The residual magnetic moment elimination structure of the battery pack also includes a second mounting plate, which is disposed at the bottom of the second battery pack and is used to support the second printed circuit board. The second mounting plate has a through second positioning groove, which corresponds one-to-one with the second battery cell and is adapted in shape. The bottom of the second battery cell is inserted into the second positioning groove, and the second positive electrode tab and the second negative electrode tab can pass through the second positioning groove and connect to the second printed circuit board.

[0021] In some optional embodiments, the battery pack residual magnetic moment elimination structure further includes a first cover plate, which is disposed above the first printed circuit board and is fixedly connected to the first mounting plate; and / or,

[0022] The residual magnetic moment elimination structure of the battery pack also includes a second cover plate, which is disposed under the second printed circuit board and is fixedly connected to the second mounting plate.

[0023] In some optional embodiments, the battery pack residual magnetic moment elimination structure further includes a third mounting plate, which is disposed at the bottom of the first battery pack. The third mounting plate has third positioning grooves that correspond one-to-one with the shape of the first battery cells, and the bottom of each first battery cell is inserted into the third positioning groove; and / or,

[0024] The residual magnetic moment elimination structure of the battery pack also includes a fourth mounting plate, which is disposed on the top of the second battery pack. The fourth mounting plate has a fourth positioning groove that corresponds to and is shaped to the second battery cell. The top of the second battery cell is inserted into the fourth positioning groove.

[0025] In some optional embodiments, the battery pack residual magnetic moment elimination structure further includes a connector, which is fixedly connected to the first mounting plate, the second mounting plate, the third mounting plate, and the fourth mounting plate.

[0026] The beneficial effects of this invention are:

[0027] This invention provides a residual magnetic moment elimination structure for a battery pack, comprising a first battery pack and a second battery pack. The first battery pack includes a first printed circuit board and a plurality of first cells arranged in an array. The first printed circuit board is parallel to the XY plane and is disposed above each of the first cells. The positive and negative electrodes of each first cell extend upward and are electrically connected to the first printed circuit board. The second battery pack is stacked below the first battery pack along the Z direction. The second battery pack includes a second printed circuit board and a plurality of second cells arranged in an array. The second printed circuit board is parallel to the XY plane and is disposed below each of the second cells. The positive and negative electrodes of each second cell extend downward and are electrically connected to the second printed circuit board. It is easy to understand that, compared to the conductive circuits on the first and second printed circuit boards, the electrode path is shorter, which causes the current of the first and second battery packs to be mainly concentrated on the XY plane. Therefore, the remanent magnetic moment of the battery pack is mainly generated by the magnetic ring surface (the area surrounded by the current loop) on the XY plane, while the remanent magnetic moment in other directions can be ignored.

[0028] The first and second battery cells are arranged in a one-to-one correspondence and are symmetrically arranged with the XY plane as a mirror plane. The conductive circuits on the first and second printed circuit boards are also symmetrically arranged with the XY plane as a mirror plane. The current directions on the first and second printed circuit boards are opposite, meaning that the current paths on the first and second printed circuit boards are consistent, the magnetic ring areas are equal, and the current magnitudes are equal while the current directions are opposite. Therefore, the dynamic residual magnetic moments in the XY plane generated by the currents on the first and second printed circuit boards can cancel each other out, thereby effectively reducing the residual magnetic moment of the battery pack, reducing external magnetic interference of the battery pack, avoiding continuous disturbance of the satellite attitude control system by the residual magnetic moment, significantly improving the satellite attitude control accuracy, reducing the frequency of high-frequency magnetic unloading operations of the magnetic torquer, reducing satellite energy consumption, and effectively extending the satellite's on-orbit service life. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the residual magnetic moment elimination structure of the battery pack according to an embodiment of the present invention;

[0031] Figure 2 This is an exploded view of the battery pack residual magnetic moment elimination structure described in an embodiment of the present invention;

[0032] Figure 3 This is an exploded view of the first battery pack described in an embodiment of the present invention;

[0033] Figure 4 This is a circuit diagram of the first battery pack according to an embodiment of the present invention;

[0034] Figure 5 This is a circuit diagram of the second battery pack described in an embodiment of the present invention.

[0035] In the picture:

[0036] 1. First battery pack; 11. First printed circuit board; 12. First battery cell; 121. First positive electrode tab; 122. First negative electrode tab;

[0037] 2. Second battery pack; 21. Second printed circuit board; 22. Second battery cell;

[0038] 3. First mounting plate; 31. First positioning groove; 4. Second mounting plate; 5. First cover plate; 6. Second cover plate; 7. Third mounting plate; 71. Third positioning groove; 8. Fourth mounting plate; 9. Connector. Detailed Implementation

[0039] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0040] In this invention, the terms "comprising," "including," "having," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] In this invention, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following related objects have an "and / or" relationship.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," "combined," "coupled," and "installed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection via an intermediate medium; or the internal communication of two components or the interaction between two components. As examples, a direct connection refers to two parts or components being connected together without the need for an intermediate medium, while an indirect connection refers to two parts or components each being connected to at least one intermediate medium, with the connection achieved through the intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0043] In this invention, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the value and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0044] In this invention, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0045] In this invention, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientations or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, in the context, it should be understood that when an element is mentioned as being "upper" or "lower" than another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as "upper side," "lower side," "left side," "right side," "front side," and "rear side" not only represent positive orientation but can also be understood as lateral orientation. For example, "above," "on top of," "upper side of," and "above" the first feature "above" or "on the second feature" includes the first feature being directly above, to the upper left, to the upper right, to the upper front, and to the upper rear of the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature. The terms "below," "under," "below," and "below" for "first feature" and "second feature" include situations where the first feature is directly below, to the lower left, to the lower right, in front of, or behind the second feature, or simply indicate that the first feature is at a lower horizontal level than the second feature. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no specific meaning.

[0046] like Figures 1-5 As shown, this embodiment provides a residual magnetic moment elimination structure for a battery pack, wherein the X, Y, and Z directions are mutually perpendicular. The residual magnetic moment elimination structure includes a first battery pack 1 and a second battery pack 2. The first battery pack 1 includes a first printed circuit board 11 and a plurality of first cells 12 arranged in an array. The first printed circuit board 11 is parallel to the XY plane and is disposed above each of the first cells 12. The first positive electrode tab 121 and the first negative electrode tab 122 of each of the first cells 12 extend upward and are electrically connected to the first printed circuit board 11. The second battery pack 2 is stacked below the first battery pack 1 along the Z direction. The second battery pack 2 includes a second printed circuit board 21 and a plurality of second cells 22 arranged in an array. The second printed circuit board 21 is parallel to the XY plane and is disposed below each of the second cells 22. The second positive electrode tab and the second negative electrode tab of each of the second cells 22 extend downward and are electrically connected to the second printed circuit board 21. It is easy to understand that, compared with the conductive circuits on the first printed circuit board 11 and the second printed circuit board, the electrode path is shorter, so that the current of the first battery pack 1 and the second battery pack 2 is mainly concentrated on the XY plane. Therefore, the residual magnetic moment of the battery pack is mainly generated by the magnetic ring surface (the area surrounded by the current loop) on the XY plane, while the residual magnetic moment in other directions can be ignored.

[0047] In this configuration, the first battery cell 12 and the second battery cell 22 are arranged in a one-to-one correspondence and are symmetrically arranged with the XY plane as a mirror plane. The conductive circuits on the first printed circuit board 11 and the second printed circuit board 21 are also symmetrically arranged with the XY plane as a mirror plane. The current directions on the first printed circuit board 11 and the second printed circuit board 21 are opposite, meaning that the current paths on the first printed circuit board 11 and the second printed circuit board 21 are consistent, the magnetic ring areas are equal, and the current magnitudes are equal while the current directions are opposite. Therefore, the dynamic residual magnetic moments in the XY plane generated by the currents on the first printed circuit board 11 and the second printed circuit board 21 can cancel each other out, thereby effectively reducing the residual magnetic moment of the battery pack, reducing external magnetic interference of the battery pack, avoiding continuous disturbance of the residual magnetic moment to the satellite attitude control system, significantly improving the satellite attitude control accuracy, reducing the frequency of high-frequency magnetic unloading operations of the magnetic torquer, reducing satellite energy consumption, and effectively extending the satellite's on-orbit service life.

[0048] In some optional embodiments, the first positive electrode tab 121 on each of the first battery cells 12 and the second positive electrode tab on the corresponding second battery cell 22 are arranged symmetrically with the XY plane as a mirror image, and the first negative electrode tab 122 on each of the first battery cells 12 and the second negative electrode tab on the corresponding second battery cell 22 are arranged symmetrically with the XY plane as a mirror image, which can further improve the symmetry of the current in the first battery pack 1 and the second battery pack 2 in the XY plane, so that the residual magnetic moments generated by the two battery packs cancel each other out.

[0049] In some optional embodiments, the first positive electrode tab 121 and the first negative electrode tab 122 are both led out from the top surface of the first cell 12, so that the path from each tab of the first cell 12 to the first printed circuit board 11 is the shortest, so that the current outside the XY plane can be ignored, thereby minimizing the dynamic residual magnetic moment in all directions outside the XY plane, and further reducing the overall residual magnetic moment of the battery pack.

[0050] Similarly, the second positive electrode and the second negative electrode are both led out from the bottom surface of the second cell 22, so that the path from each electrode of the second cell 22 to the second printed circuit board 21 is the shortest, so that the current outside the XY plane can be ignored, thereby minimizing the dynamic residual magnetic moment in all directions outside the XY plane, and further reducing the overall residual magnetic moment of the battery pack.

[0051] In some optional embodiments, multiple first cells 12 and multiple second cells 22 are arranged in an M-row × N-column array, where M≥2 and N≥2. The first cells 12 in the same column are connected in series to form a first series branch, and these first series branches are connected in parallel. Similarly, the second cells 22 in the same column are connected in series to form a second series branch, and these second series branches are connected in parallel. The electrical connection layout of each first cell 12 and each second cell 22 is mirror-symmetric about the XY plane. Both the first cells 12 and the second cells 22 adopt a series-then-parallel electrical connection method. First, the cells are formed into multiple independent series branches, and then these series branches are connected in parallel. When a cell fails, the fault is limited to its single series branch, preventing other intact cells from discharging large currents into the faulty cell. This effectively reduces the risk of thermal runaway and improves the overall safety performance and charging / discharging stability of the battery pack. In addition, the structure of multiple series branches connected in parallel also facilitates the balanced management of battery cells, which is conducive to the uniform distribution of current among the branches and reduces the circulating current between parallel branches.

[0052] In this embodiment, M is 13 and N is 8. Optionally, M and N can also be 2, 5, 7, 9, 12, 15 or 18, which is not limited here.

[0053] In some optional embodiments, both the first cell 12 and the second cell 22 include an aluminum alloy casing. Aluminum alloy is a non-magnetic material, which helps reduce the static remanent magnetic moment of the cell and further minimizes the overall remanent magnetic moment of the battery pack. Furthermore, the aluminum alloy casing has high structural strength, good resistance to extrusion deformation, and can withstand the assembly stress of array assembly and stacked installation; it also has excellent thermal conductivity, which facilitates heat dissipation from the cell and reduces heat accumulation.

[0054] In some alternative embodiments, both the first cell 12 and the second cell 22 are prismatic cells. The regular shape of the prismatic cells facilitates their array arrangement, resulting in a compact battery pack structure.

[0055] In some optional embodiments, the battery pack residual magnetic moment elimination structure further includes a first mounting plate 3. The first mounting plate 3 is disposed on the top of the first battery pack 1 and is used to support the first printed circuit board 11. The first mounting plate 3 has a through first positioning groove 31. The first positioning groove 31 corresponds one-to-one with the first battery cell 12 and is adapted in shape. The top of the first battery cell 12 is limited and inserted into the first positioning groove 31 to realize the limited installation of each first battery cell 12, ensuring that the first battery cells 12 are arranged according to the preset array rules, improving the structural stability of the battery pack. In addition, the first positive electrode tab 121 and the first negative electrode tab 122 can pass through the first positioning groove 31 and connect to the first printed circuit board 11, which can make the path from the tab to the first printed circuit board 11 the shortest, ensuring that most of the connection current between the battery cells flows in the traces of the first printed circuit board 11, so that the main body of the current loop is in the same plane, providing a basis for the mutual cancellation of the dynamic residual magnetic moments of the first battery pack 1 and the second battery pack 2.

[0056] Similarly, the residual magnetic moment elimination structure of the battery pack also includes a second mounting plate 4, which is disposed at the bottom of the second battery pack 2 and is used to support the second printed circuit board 21. The second mounting plate 4 has a through second positioning groove, which corresponds one-to-one with the second battery cell 22 and is adapted in shape. The bottom of the second battery cell 22 is inserted into the second positioning groove to realize the positioning installation of each second battery cell 22, ensuring that the second battery cells 22 are arranged according to the preset array rules, improving the structural stability of the battery pack. The second positive electrode tab and the second negative electrode tab can pass through the second positioning groove and connect to the second printed circuit board 21, which can make the path from the tab to the second printed circuit board 21 the shortest, ensuring that most of the connection current between the battery cells flows in the traces of the second printed circuit board 21, so that the main body of the current loop is in the same plane, providing a basis for the mutual cancellation of the dynamic residual magnetic moments of the first battery pack 1 and the second battery pack 2.

[0057] Furthermore, the residual magnetic moment elimination structure of the battery pack also includes a first cover plate 5, which is disposed on top of the first printed circuit board 11 and is fixedly connected to the first mounting plate 3. The first cover plate 5 can confine the first printed circuit board 11 on the first mounting plate 3, realizing reliable installation of the circuit board; and the first cover plate 5 can form an external protective barrier for the first printed circuit board 11, preventing dust accumulation, short circuits or poor contact on the circuit board, and preventing damage to components from collisions, effectively extending the service life of the circuit board.

[0058] Similarly, the residual magnetic moment elimination structure of the battery pack also includes a second cover plate 6, which is disposed under the second printed circuit board 21 and is fixedly connected to the second mounting plate 4. The second cover plate 6 can confine the second printed circuit board 21 on the second mounting plate 4, so as to realize the reliable installation of the circuit board; and the second cover plate 6 can form an external protective barrier for the second printed circuit board 21, effectively extending the service life of the circuit board.

[0059] In some optional embodiments, the residual magnetic moment elimination structure of the battery pack further includes a third mounting plate 7. The third mounting plate 7 is disposed at the bottom of the first battery pack 1. The third mounting plate 7 has a third positioning groove 71 that corresponds one-to-one with the shape of the first battery cell 12. The bottom of the first battery cell 12 is inserted into the third positioning groove 71, forming a reliable positioning of the bottom of the first battery cell 12. The third mounting plate 7 and the first mounting plate 3 work together to form a double limit on the bottom and top of the first battery cell 12, further improving the stability and reliability of the positioning and installation of the first battery cell 12, thereby improving the structural strength of the battery pack, and avoiding large-area shading of the surface of the first battery cell 12, preventing it from affecting the heat dissipation of the battery cell.

[0060] Similarly, the residual magnetic moment elimination structure of the battery pack also includes a fourth mounting plate 8, which is disposed on the top of the second battery pack 2. The fourth mounting plate 8 has a fourth positioning groove that corresponds one-to-one with the shape of the second cell 22. The top of the second cell 22 is inserted into the fourth positioning groove, forming a reliable positioning for the bottom of the second cell 22. The fourth mounting plate 8 and the second mounting plate 4 work together to form a double limit on the bottom and top of the second cell 22, further improving the stability and reliability of the positioning and installation of the second cell 22, thereby improving the structural strength of the battery pack and avoiding large-area shading of the surface of the second cell 22, thus preventing the cell heat dissipation from being affected.

[0061] Furthermore, the battery pack residual magnetic moment elimination structure also includes a connector 9, which is fixedly connected to the first mounting plate 3, the second mounting plate 4, the third mounting plate 7 and the fourth mounting plate 8 to achieve a reliable connection between the first battery pack 1 and the second battery pack 2. This helps to ensure the stability of the mirror symmetrical layout structure of the first battery pack 1 and the second battery pack 2, thereby achieving long-term stable mutual cancellation of dynamic residual magnetic moments.

[0062] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A structure for eliminating residual magnetic moment in a battery pack, characterized in that, The battery pack residual magnetic moment elimination structure includes the following components, wherein the X, Y, and Z directions are mutually perpendicular: The first battery pack (1) includes a first printed circuit board (11) and a plurality of first cells (12). The plurality of first cells (12) are arranged in an array. The first printed circuit board (11) is parallel to the XY plane and is disposed above each of the first cells (12). The first positive electrode tab (121) and the first negative electrode tab (122) of each of the first cells (12) extend upward and are electrically connected to the first printed circuit board (11). The second battery pack (2) is stacked below the first battery pack (1) along the Z direction. The second battery pack (2) includes a second printed circuit board (21) and a plurality of second cells (22). The plurality of second cells (22) are arranged in an array. The second printed circuit board (21) is parallel to the XY plane and is disposed below each of the second cells (22). The second positive electrode tab and the second negative electrode tab of each of the second cells (22) extend downward and are electrically connected to the second printed circuit board (21). The first battery cell (12) and the second battery cell (22) are one-to-one and are symmetrically arranged with the XY plane as a mirror plane. The conductive circuits on the first printed circuit board (11) and the second printed circuit board (21) are symmetrically arranged with the XY plane as a mirror plane, and the current directions on the first printed circuit board (11) and the second printed circuit board (21) are opposite.

2. The battery pack residual magnetic moment elimination structure according to claim 1, characterized in that, The first positive electrode tab (121) on each of the first battery cells (12) and the second positive electrode tab on the corresponding second battery cell (22) are symmetrically arranged with the XY plane as a mirror plane, and the first negative electrode tab (122) on each of the first battery cells (12) and the second negative electrode tab on the corresponding second battery cell (22) are symmetrically arranged with the XY plane as a mirror plane.

3. The battery pack residual magnetic moment elimination structure according to claim 1, characterized in that, The first positive electrode tab (121) and the first negative electrode tab (122) are both led out from the top surface of the first battery cell (12), and the second positive electrode tab and the second negative electrode tab are both led out from the bottom surface of the second battery cell (22).

4. The battery pack residual magnetic moment elimination structure according to claim 1, characterized in that, Multiple first cells (12) and multiple second cells (22) are arranged in an array of M rows × N columns, where M ≥ 2 and N ≥ 2; Each of the first cells (12) in the same column is connected in series to form a first series branch, and each of the first series branches is connected in parallel to each other; Each of the second cells (22) in the same column is connected in series to form a second series branch, and each of the second series branches is connected in parallel.

5. The battery pack residual magnetic moment elimination structure according to claim 4, characterized in that, M is 13 and N is 8.

6. The battery pack residual magnetic moment elimination structure according to claim 1, characterized in that, Both the first battery cell (12) and the second battery cell (22) include an aluminum alloy casing; and / or, Both the first cell (12) and the second cell (22) are square cells.

7. The battery pack residual magnetic moment elimination structure according to any one of claims 1 to 6, characterized in that, The residual magnetic moment elimination structure of the battery pack further includes a first mounting plate (3), which is disposed on the top of the first battery pack (1) and is used to support the first printed circuit board (11). The first mounting plate (3) has a through first positioning groove (31), which corresponds one-to-one with the first battery cell (12) and is adapted in shape. The top of the first battery cell (12) is inserted into the first positioning groove (31), and the first positive electrode tab (121) and the first negative electrode tab (122) can pass through the first positioning groove (31) and connect to the first printed circuit board (11); and / or, The residual magnetic moment elimination structure of the battery pack also includes a second mounting plate (4). The second mounting plate (4) is disposed at the bottom of the second battery pack (2) and is used to support the second printed circuit board (21). A through second positioning groove is provided on the second mounting plate (4). The second positioning groove corresponds one-to-one with the second battery cell (22) and is adapted in shape. The bottom of the second battery cell (22) is inserted into the second positioning groove, and the second positive electrode tab and the second negative electrode tab can pass through the second positioning groove and connect to the second printed circuit board (21).

8. The battery pack residual magnetic moment elimination structure according to claim 7, characterized in that, The residual magnetic moment elimination structure of the battery pack further includes a first cover plate (5), which is disposed on top of the first printed circuit board (11) and is fixedly connected to the first mounting plate (3); and / or, The residual magnetic moment elimination structure of the battery pack also includes a second cover plate (6), which is disposed under the second printed circuit board (21) and is fixedly connected to the second mounting plate (4).

9. The battery pack residual magnetic moment elimination structure according to claim 7, characterized in that, The residual magnetic moment elimination structure of the battery pack also includes a third mounting plate (7), which is disposed at the bottom of the first battery pack (1). The third mounting plate (7) has a third positioning groove (71) that corresponds one-to-one with the first battery cell (12) and is adapted in shape. The bottom of the first battery cell (12) is inserted into the third positioning groove (71); and / or, The residual magnetic moment elimination structure of the battery pack also includes a fourth mounting plate (8), which is disposed on the top of the second battery pack (2). The fourth mounting plate (8) has a fourth positioning groove that corresponds to the second cell (22) and is adapted in shape. The top of the second cell (22) is inserted into the fourth positioning groove.

10. The battery pack residual magnetic moment elimination structure according to claim 9, characterized in that, The residual magnetic moment elimination structure of the battery pack also includes a connector (9), which is fixedly connected to the first mounting plate (3), the second mounting plate (4), the third mounting plate (7) and the fourth mounting plate (8).

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