Battery protection board and battery

Abstract

The utility model provides a battery protection board and a battery, and relates to the technical field of batteries. In the battery protection plate, the orthographic projection of the conductive component electrically connected with the battery cell is in the orthographic projection of the plate main body, so that the arrangement of the conductive component does not occupy the arrangement space of the outer side of the plate main body, and the plate surface of the plate main body is circular, so that the integral structure formed by the plate main body and the conductive component is circular on the projection surface. Therefore, according to the battery protection plate provided by the invention, the whole body formed by the plate main body and the conductive component is circular, and compared with other shapes, such as a square shape, the perimeter of the whole body formed by the circular plate main body and the conductive component is smaller under the condition of the same area. In other words, under the condition that the perimeters are the same, the area of the circular whole body is larger, so that more device arrangement space can be provided, and materials consumed by the board main body and the conductive components can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and more particularly to a battery protection board and a battery. Background Art

[0002] In the prior art, a battery, such as a lithium battery, can be provided with a PCM (Protection Circuit Module) to protect the battery. The PCM usually integrates components on a substrate, such as a PCB (Printed Circuit Board), and the conductive members (such as nickel sheets) connected to the battery cells are also arranged on the PCB, that is, in the middle position of the PCB.

[0003] However, the space available for arranging components provided by the existing PCM is limited. Utility Model Content

[0004] In view of this, the present application provides a battery protection board and a battery, aiming to solve, to a certain extent, the technical problem that the space available for arranging components provided by the existing PCM is limited.

[0005] The present application provides a battery protection board, which includes:

[0006] A board body, the board body having a board surface, and the board surface being circular;

[0007] A conductive member, the conductive member being arranged on the board surface, the orthographic projection of the conductive member on a projection plane parallel to the board surface being located within the orthographic projection of the board body on the projection plane, the conductive member being electrically connected to the board body, and the conductive member being used for electrically connecting the electrode tabs of the battery cells.

[0008] Preferably, the conductive member includes a first conductive portion and a second conductive portion, both the first conductive portion and the second conductive portion including edge portions that coincide with the outer edge of the board body, and the first conductive portion and the second conductive portion being respectively located on opposite sides of the board body.

[0009] Preferably, each of the first conductive portion and the second conductive portion is configured to have a first end portion and a second end portion, and is further configured to have an arc-shaped outer side edge between the first end portion and the second end portion and a curved inner side edge between the first end portion and the second end portion, and the bending directions of the inner side edge and the outer side edge are the same;

[0010] Wherein, the outer side edge coincides with the outer edge of the board body;

[0011] Among them, in a direction perpendicular to the direction determined by the first end portion and the second end portion, among two points corresponding to each other on the outer side edge and the inner side edge, the curvature of the point on the outer side edge is smaller than the curvature of the point on the inner side edge.

[0012] Preferably, each of the first conductive portion and the second conductive portion is configured to have a defective portion for connecting to the tab of the battery cell.

[0013] Preferably, the battery protection board further includes a heat dissipation mechanism connected to the conductive member to dissipate the heat of the conductive member to the external environment, and the heat dissipation mechanism is disposed on the side surface of the board body.

[0014] Preferably, the heat dissipation mechanism includes a heat dissipation member disposed on the side surface, the heat dissipation member is disposed between the first conductive portion and the second conductive portion, and the heat dissipation member is connected to both the first conductive portion and the second conductive portion.

[0015] Preferably, the heat dissipation mechanism further includes a first heat conduction plate and a second heat conduction plate, the first heat conduction plate connects the first conductive portion and the heat dissipation member, and the second heat conduction plate is connected to the second conductive portion and the heat dissipation member.

[0016] Preferably, the heat dissipation mechanism includes a heat dissipation member connected to the conductive member, and the heat dissipation member includes a plurality of heat dissipation holes, heat dissipation protrusions and / or heat dissipation recesses.

[0017] Preferably, the board body is a printed circuit board, the conductive member is a sheet-like structure, and the conductive member is formed of nickel.

[0018] A second aspect of the present application provides a battery, and the battery includes the battery protection board as described above.

[0019] According to the battery protection board provided by the embodiment of the present application, in the battery protection board, the orthographic projection of the conductive member electrically connected to the battery cell is within the orthographic projection of the board body. Thus, the arrangement of the conductive member does not occupy the arrangement space outside the board body, and the board surface of the board body is circular, so that the overall structure formed by the board body and the conductive member presents a circular shape on the projection plane. In this way, according to the battery protection board provided by the present application, the overall formed by the board body and the conductive member is circular. Compared with other shapes, such as a square, when the areas are the same, the perimeter of the overall formed by the circular board body and the conductive member is smaller. In other words, when the perimeters are the same, the area of the aforementioned circular overall is larger, so that more device arrangement space can be provided, and in addition, it is beneficial to reduce the materials consumed by the board body and the conductive member.

[0020] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides preferred embodiments in conjunction with the accompanying drawings and describes them in detail as follows. Brief Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 A schematic diagram showing a plan view of a battery protection board provided according to the first aspect of the embodiments of the present application.

[0023] Figure 2 A schematic diagram showing a three-dimensional view of a battery protection board provided according to the first aspect of the embodiments of the present application.

[0024] Figure 3 A schematic diagram showing the connection between a battery protection board and a battery provided according to the first aspect of the embodiments of the present application.

[0025] Reference Numerals:

[0026] 100 - board body;

[0027] 210 - first conductive part; 220 - second conductive part; 211 - inner side; 212 - outer side; 213 - first end; 214 - second end; 215 - welding hole;

[0028] 300 - protection circuit;

[0029] 410 - heat dissipation member; 420 - first heat conducting plate; 430 - second heat conducting plate; 500 - output pad; F - transverse; 600 - battery cell. Detailed Description of the Embodiments

[0030] The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0032] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0033] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.

[0034] According to a first aspect of an embodiment of the present application, a battery protection board is provided. The following will be combined with Figures 1 to 3 specifically describe the structure and working principle of the battery protection board.

[0035] According to a first aspect of an embodiment of the present application, a battery protection board is provided. The battery protection board includes a board body and a conductive member. The board body has a board surface, and the board surface is circular. The conductive member is disposed on the board surface, and the orthographic projection of the conductive member on the projection plane parallel to the board surface is located within the orthographic projection of the board body on the projection plane. The conductive member is electrically connected to the board body, and the conductive member is used for electrically connecting the tabs of the battery cells.

[0036] Thus, for the battery protection board provided by the first aspect of the embodiments of the present application, in the battery protection board, the orthographic projection of the conductive member electrically connected to the battery cell is within the orthographic projection of the board body. Thus, the arrangement of the conductive member does not occupy the arrangement space outside the board body, and the board surface of the board body is circular, so that the overall structure formed by the board body and the conductive member presents a circular shape on the projection plane. Thus, for the battery protection board provided by the embodiments of the present application, the overall formed by the board body and the conductive member is circular. Compared with other shapes, such as square, when the areas are the same, the perimeter of the overall formed by the circular board body and the conductive member is smaller. In other words, when the perimeters are the same, the area of the aforementioned circular overall is larger. Therefore, more device arrangement space can be provided, and in addition, it is beneficial to reduce the materials consumed by the board body and the conductive member.

[0037] For the battery protection board provided by the embodiments of the present application, as described above, the conductive member may include a first conductive part 210 and a second conductive part 220. Both the first conductive part 210 and the second conductive part 220 include edge parts that coincide with the outer edge of the board body, and the first conductive part 210 and the second conductive part 220 are respectively located on opposite sides of the board body.

[0038] Thus, for the battery protection board provided by the embodiments of the present application, compared with the prior art, the first conductive part 210 and the second conductive part 220 are located at the edge of the board body, thereby releasing the original middle position on the board body for arranging conductive components, and further increasing the arrangement space on the board body, so that there is no need to additionally increase the size of the board body.

[0039] In addition, for the existing solution of arranging conductive components at the middle position of the board body, to arrange other devices on the board body, an interval distance needs to be left between other devices and the conductive components. Usually, the interval distance is more than 1.0 mm. In this way, if a conductive component is located in the middle of the board surface of the board body, such interval distances need to be left on both sides of the conductive component, resulting in that no devices can be arranged in the space with a width of more than 2.0 mm around the conductive component. However, for the battery protection board provided by the embodiments of the present application, since the conductive member is located at the edge of the board body, there is no need to be forced to arrange other devices on both sides of the conductive member. Only the need to consider separating the device from the side of the conductive member facing the inside of the board surface can avoid the occupation of the aforementioned space with a width of more than 2.0 mm.

[0040] In addition, in the embodiment, when the conductive member disposed at the edge of the board body is electrically connected to the tab of the battery cell, the requirement for the attitude of the board body is reduced. Specifically, in the prior art, when the conductive member is arranged in the middle of the board surface of the board body, it may cause the board body to be arranged in an attitude facing the battery cell, that is, the board surface of the board body has to be forced to synchronize with the spatial attitude of the conductive member and face the battery cell in order to make the tab of the battery cell closest to the conductive member. However, with the battery protection board provided by the embodiment of the present application, since the conductive part of the conductive member has an edge that coincides with the outer edge of the board body, the flexibility of the relative position between the conductive member and the battery cell is increased, so that when the relative position between the battery protection board and the battery cell is appropriate, the conductive member can adjust its position without flipping the board body.

[0041] In the embodiment, the board body may include a board body 100 and a protection circuit 300 disposed on the board body 100. Among them, the protection circuit 300 can be used to collect signals of the battery cell, such as voltage, current, and temperature signals, so as to achieve the protection of the battery cell. The protection circuit 300 can be formed by electrically connecting a plurality of electronic devices mounted on the board surface of the board body 100. These electronic devices can include, for example, MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), coulometer, capacitor, and resistor. In addition, the specific arrangement method of the protection circuit 300 is the prior art and will not be elaborated here.

[0042] In the embodiment, the board body 100 can be a substrate that provides an installation position (i.e., the board surface) for the protection circuit 300, and realizes the electrical connection between different electronic devices through the conductive pattern on the board surface. In the embodiment, the board body 100 can be, for example, a PCB (printed circuit board), and one side board surface of the PCB can be formed as the above-mentioned board surface. That is to say, the conductive part of the above-mentioned conductive member not only has an edge that coincides with the outer edge of the PCB, but also is electrically connected to the protection circuit 300 through the conductive pattern on the PCB.

[0043] In the embodiment, the battery cell of the battery can include a positive tab and a negative tab, and the conductive member can be used to electrically connect to these two tabs, so as to establish an electrical connection between the protection circuit 300 and these two tabs to protect the battery cell.

[0044] In the embodiment, Figure 1 The presented perspective is the perspective observed along the direction perpendicular to the board surface, that is, the board surface of the PCB, that is, Figure 1 It is a plan view obtained from this perspective. In other words, Figure 1 The presented observation perspective is also the projection direction of the "orthographic projection" mentioned above. See Figure 1 , Figure 1In the given example, both the first conductive part 210 and the second conductive part 220 included in the conductive member can be respectively and correspondingly connected to the positive electrode tab and the negative electrode tab of the battery cell. Therefore, in Figure 1 it, B+ is embodied on the first conductive part 210 to embody its use for connection to the positive electrode tab, and B- is embodied on the second conductive part 220 to embody its use for connection to the negative electrode tab.

[0045] In an embodiment, each of the first conductive part 210 and the second conductive part 220 can be configured to have a first end 213 and a second end 214, and can also be configured to have an arc-shaped outer side 212 between the first end 213 and the second end 214 and a curved inner side 211 between the first end 213 and the second end 214. In an embodiment, the aforementioned outer side 212 can be connected to the outer edge of the plate body. In an embodiment, in a direction perpendicular to the direction determined by the first end 213 and the second end 214, among two points corresponding to each other on the outer side 212 and the inner side 211, the curvature of the point on the outer side 212 can be less than the curvature of the point on the inner side 211.

[0046] In an embodiment, as Figure 1 shown, both the first conductive part 210 and the second conductive part 220 can be strip-shaped structures, and the structures of both the first conductive part 210 and the second conductive part 220 can be the same. Hereinafter, the first conductive part 210 will be taken as an example for description.

[0047] In an embodiment, referring to Figure 1 , the first conductive part 210 includes the aforementioned first end 213 and second end 214, Figure 1 in it, the first end 213 and the second end 214 are marked on the second conductive part 220, but since the structures of both the first conductive part 210 and the second conductive part 220 can be the same, the marking of the second conductive part 220 is equally applicable to the first conductive part 210.

[0048] In an embodiment, the inner side 211 and the outer side 212 of the first conductive part 210 extend between the first end 213 and the second end 214. Among them, the outer side 212 of the first conductive part 210 is a part of the outer contour of the circular whole forming the aforementioned conductive member and the plate body. Therefore, the outer side 212 of the first conductive part 210 is arc-shaped. More specifically, the outer side 212 of both the first conductive part 210 and the second conductive part 220 can preferably be a minor arc, so as to leave more layout space for the layout of the plate body within the circular whole of the aforementioned conductive member and the plate body.

[0049] In an embodiment, the inner side 211 of the first conductive portion 210 may be curved and is used to connect with the edge portion of the board body. Preferably, the edge portion of the board body may be adapted to the inner side 211 of the first conductive portion 210 and the inner side 211 of the second conductive portion 220 to improve the connection strength between the board body and the conductive member. Specifically, the inner side 211 of the first conductive portion 210 may have the same bending direction as the outer side 212 of the first conductive portion 210, that is, both protrude towards the same side. And the side of the inner side 211 of the first conductive portion 210 facing the board body may be concave. Correspondingly, the side of the guiding substrate facing the inner side 211 of the first conductive portion 210 may be convex.

[0050] In an embodiment, since both the inner side 211 of the first conductive portion 210 and the inner side 211 of the second conductive portion 220 are concave with respect to the middle of the board surface of the board body.

[0051] See Figure 1 , the shapes of the first conductive portion 210 and the second conductive portion 220 can be further described in combination with the above description. In an embodiment, the first conductive portion 210 and the second conductive portion 220 may be respectively located on two opposite sides of the board surface of the board body. Here, the direction determined by the first conductive portion 210 and the second conductive portion 220 is defined as the predetermined direction. In Figure 1 In terms of Figure 1 orientation, it is represented as the horizontal direction F.

[0052] In an embodiment, the above-mentioned horizontal direction F can also be determined in the following way, that is, the direction perpendicular to the direction determined by the first end portion 213 and the second end portion 214 (that is, the longitudinal direction in Figure 1 ). On the horizontal direction F, the two points corresponding to each other on the inner side 211 and the outer side 212 can be understood as the two points formed by the straight line extending along the horizontal direction F intersecting the inner side 211 and the outer side 212 respectively. Among these two points, the curvature of the point on the outer side 212 is smaller than the curvature of the point on the inner side 211. In other words, the outer side 212 protrudes more towards the direction away from the board body, that is, towards the outside.

[0053] This makes the first conductive portion 210 and the second conductive portion 220 form a "crescent" - shaped strip structure with the width gradually increasing from the first end portion 213 to the second end portion 214 and then gradually decreasing.

[0054] According to the battery protection board provided by the embodiment of the present application, in an embodiment, each of the first conductive portion 210 and the second conductive portion 220 is configured to have a defective portion, and the defective portion is used to connect with the tab of the battery cell. By using the defective portions opened in each of the first conductive portion 210 and the second conductive portion 220, it can play a role in accommodating a part of the tab of the battery cell, thereby increasing the reliability of the electrical connection.

[0055] In an embodiment, the defective portion may be, for example, a through hole or a recess. In Figure 1 the example given, the defective portion may be, for example, a through hole. In the embodiment, the defective portion is formed as a substantially welding hole 215. As an example, a plurality of welding holes 215 may be arranged along the longitudinal direction on the same conductive portion, such as 2 ( Figure 1 example in), 3, 4 or even more.

[0056] According to the battery protection board provided by the embodiment of the present application, the battery protection board may further include a heat dissipation mechanism, and the heat dissipation mechanism may be connected to the conductive member to dissipate the heat of the conductive member to the external environment, and the heat dissipation mechanism is disposed on the plate surface of the plate body.

[0057] Thus, according to the heat dissipation mechanism provided by the embodiment of the present application, the heat dissipation mechanism is disposed on the plate surface of the plate body and is connected to the conductive member, so that the heat of the conductive member and the heat of the plate body can be dissipated to the external environment, thereby reducing the temperature of the battery cell and the plate body, which is beneficial to improving the service performance of the battery cell.

[0058] According to the battery protection board provided by the embodiment of the present application, as mentioned in the above description, the first conductive portion 210 and the second conductive portion 220 face each other. Thus, a relatively large distance can also be maintained between the first conductive portion 210 and the second conductive portion 220, so as to avoid short circuit between the positive electrode tab and the negative electrode tab of the battery cell.

[0059] In the embodiment, the heat dissipation mechanism may include a heat dissipation member 410. The heat dissipation member 410 may be disposed on the plate surface, and the heat dissipation member 410 is disposed between the first conductive portion 210 and the second conductive portion 220, and the heat dissipation member 410 is connected to both the first conductive portion 210 and the second conductive portion 220.

[0060] In the embodiment, the heat dissipation member 410 may be, for example, a heat dissipation plate, and the heat dissipation plate may be disposed on the plate surface. As an example, a thermal conductive adhesive layer may be disposed on the plate surface, and the heat dissipation plate is disposed on the thermal conductive adhesive layer, so as to fix the heat dissipation plate on the plate surface while ensuring effective heat transfer between the heat dissipation plate and the plate body. In addition, in the embodiment, the heat dissipation plate may be, for example, a metal plate, such as a copper plate or an aluminum plate.

[0061] In the embodiment, the heat dissipation mechanism may further include a first heat dissipation plate 420 and a second heat dissipation plate 430. The first heat dissipation plate 420 may connect the first conductive portion 210 and the heat dissipation member 410, and the second heat dissipation plate 430 may be connected to the second conductive portion 220 and the heat dissipation member 410. Specifically, the first heat dissipation plate 420 may be connected to the inner side edge 211 of the first conductive portion 210, and the second heat dissipation plate 430 may be connected to the inner side edge 211 of the second conductive portion 220.

[0062] According to the battery protection board provided by the embodiments of the present application, the heat dissipation member 410 may include a plurality of heat dissipation holes, heat dissipation protrusions, and / or heat dissipation recesses. In this way, the heat dissipation member 410 may have a larger surface area, thereby increasing the heat dissipation area. As an example, the heat dissipation member 410 may be provided with heat dissipation holes arranged in an array (as Figure 1 shown), heat dissipation holes arranged in an array, and / or heat dissipation recesses arranged in an array.

[0063] In addition, according to the battery protection board provided by the embodiments of the present application, the conductive member may be formed in a sheet shape, and the conductive member may be formed of nickel. In addition, according to the battery protection board provided by the embodiments of the present application, it is formed into a substantially PCM. The battery protection board may further be provided with two output pads 500 disposed on the plate surface of the plate body of the battery protection board. Figure 1 Among them, P+ is reflected on one output pad 500 to represent its positive electrical property, and P- is reflected on the other output pad 500 to represent its negative electrical property.

[0064] According to the second aspect of the embodiments of the present application, a battery is provided. The battery may include the above battery protection board, and may further include the above battery cell 600. The battery has the above beneficial effects, which will not be elaborated here.

[0065] The above are only the preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. Any equivalent structural transformation made by using the description and drawings of the present application under the innovative concept of the present application, or direct / indirect application in other related technical fields, is included in the protection scope of the present application.

Claims

1. A battery protection board, characterized in that: The battery protection board comprises: A plate body, wherein the plate body has a plate surface, and the plate surface is circular; A conductive component is arranged on the board surface, the orthographic projection of the conductive component on a projection plane parallel to the board surface is located within the orthographic projection of the board body on the projection plane, the conductive component is electrically connected to the board body, and the conductive component is used to electrically connect the tabs of the battery cell.

2. The battery protection board according to claim 1, characterized in that: The conductive component includes a first conductive portion and a second conductive portion, each of which includes an edge portion that coincides with an outer edge of the plate body, and the first conductive portion and the second conductive portion are respectively located on two opposite sides of the plate body.

3. The battery protection board according to claim 2, characterized in that: Each of the first conductive portion and the second conductive portion is configured to have a first end and a second end, and is further configured to have an arc-shaped outer side between the first end and the second end and a curved inner side between the first end and the second end, the inner side having the same curvature direction as the outer side; wherein the outer side coincides with the outer edge of the plate body; Among them, in the direction perpendicular to the direction determined by the first end and the second end, among the two points corresponding to each other on the outer side and the inner side, the curvature of the point on the outer side is smaller than the curvature of the point on the inner side.

4. The battery protection board according to claim 2, characterized in that: Each of the first conductive portion and the second conductive portion is configured to have a cutout portion for connecting with a tab of the battery cell.

5. The battery protection board according to claim 2, characterized in that: The battery protection board also includes a heat dissipation mechanism, which is connected to the conductive component to dissipate the heat of the conductive component to the external environment, and the heat dissipation mechanism is arranged on the side of the board body.

6. The battery protection board according to claim 5, characterized in that: The heat dissipation mechanism includes a heat dissipation component, which is disposed on the side surface, disposed between the first conductive part and the second conductive part, and connected to both the first conductive part and the second conductive part.

7. The battery protection board according to claim 6, characterized in that: The heat dissipation mechanism further includes a first heat conducting plate and a second heat conducting plate, wherein the first heat conducting plate connects the first conductive portion and the heat dissipation component, and the second heat conducting plate connects the second conductive portion and the heat dissipation component.

8. The battery protection board according to claim 5, characterized in that: The heat dissipation mechanism includes a heat dissipation component connected to the conductive component, and the heat dissipation component includes a plurality of heat dissipation holes, heat dissipation protrusions and / or heat dissipation recesses.

9. The battery protection board according to claim 1, characterized in that: The board body is a printed circuit board, the conductive member is a sheet-like structure, and the conductive member is formed of nickel.

10. A battery, characterized in that: The battery comprises the battery protection plate according to any one of claims 1 to 9.

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