Collector plate assembly, battery and electric device

Abstract

The embodiment of the utility model provides a collector plate assembly, a battery and an electric device. The current collecting plate assembly is applied to the battery and comprises a current collecting plate body and a supporting piece, the supporting piece is connected to the current collecting plate body and protrudes out of the outer surface of the current collecting plate body, at least part of the supporting piece is suitable for extending into a battery cell hole of the battery, and the current collecting plate and the supporting piece are of an integrally-formed structure. The embodiment of the utility model can simplify the welding process of the battery.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a current collector plate assembly, a battery and a power utilization device. BACKGROUND

[0002] The wound battery, as an important energy storage system, has the characteristics of mature process, high production efficiency and strong reliability, and has a wide application prospect in various fields such as electric vehicles, electric two-wheel vehicles and electric three-wheel vehicles. The wound battery cell usually has a center hole formed by winding, but during the cycle use of the battery, the center hole has the risk of internal collapse caused by the expansion of the wound core. Therefore, a support member needs to be arranged to support the center hole.

[0003] In the prior art, the support member is first welded on the current collector plate, and then the current collector plate is welded on the wound core. The support member needs to be installed in the center hole through multiple welding processes, and the welding process is relatively complex. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a current collector plate assembly, a battery and a power utilization device to solve the problem of complex welding process in the existing battery structure.

[0005] To solve the above technical problems, the application is implemented as follows:

[0006] In a first aspect, the application discloses a current collector plate assembly, which comprises:

[0007] a current collector plate body;

[0008] a support member connected to the current collector plate body and protruding from the outer surface of the current collector plate body, at least part of the support member being adapted to extend into the core hole of the battery;

[0009] The current collector plate body and the support member are integrally formed.

[0010] Optionally, the current collector plate body comprises a first surface and a second surface oppositely arranged along the thickness direction, the second surface being adapted to electrically connect the core of the battery, and the support member is connected to the second surface and protrudes from the second surface.

[0011] Optionally, the current collector plate body has a first through hole.

[0012] The support member is a tubular structure, which comprises a tube wall and a second through hole in the tube wall, and the first through hole and the second through hole are in communication.

[0013] Optionally, the aperture of the first through hole is larger than the aperture of the second through hole.

[0014] Optionally, the material of the tube wall is a metal material.

[0015] Optionally, the tube wall is a mesh structure.

[0016] Optionally, the wall thickness of the tube wall is 0.3mm-0.6mm.

[0017] In a second aspect, the application discloses a battery, which comprises:

[0018] a shell;

[0019] a cell, which is located in the shell and has a through hole;

[0020] and the current collector assembly as described in any of the above, the current collector body is connected to the cell, and the support member at least partially extends into the through hole to support the cell.

[0021] Optionally, the cell is wound along the cell winding axis direction, the size of the support member is L1, and the size of the cell core is L2, and the relationship between L1 and L2 satisfies: 1 / 5*L2

[0022] Optionally, the cell comprises a tab, and the tab is welded to the current collector body.

[0023] Optionally, the tab comprises a positive tab and a negative tab.

[0024] The positive tab and the negative tab are respectively located at two ends of the cell along the cell axial direction.

[0025] The tab with a lower heat generation among the positive tab and the negative tab is a target tab, and the current collector body is electrically connected to the target tab.

[0026] In a third aspect, the application further discloses a power consumption device, which comprises the battery as described in any of the above.

[0027] In the embodiments of the application, the current collector body and the support member are arranged as an integrated structure, so that only the current collector body and the cell of the battery need to be welded together in the welding process, and the support member does not need to be welded, so that the welding process in the battery can be simplified. In addition, the current collector and the through hole need to be coaxially arranged and cannot be eccentric, and the current collector body and the support member are an integrated structure, so that when the current collector assembly is installed, the support member is inserted into the cell hole, and the position of the current collector body is also limited at the center position of the cell hole. In the welding process, the position of the current collector body does not need to be fixed by a welding positioning clamp, the position of the current collector can be avoided from deviating from the center, and the welding process can be simplified.

[0028] The additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter in the description of an embodiment of the present application, which will be described in the following description with reference to the following figures, wherein: BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of embodiments, given by way of example, and with reference to the following drawings, wherein:

[0030] Figure 1 is a structural schematic view of a current collecting plate assembly according to an embodiment of the present application;

[0031] Figure 2 is a structural schematic view of a battery according to an embodiment of the present application;

[0032] Figure 3 is a front view of a battery according to an embodiment of the present application.

[0033] Reference signs: 1 - current collecting plate assembly, 10 - current collecting plate body, 101 - first surface, 102 - second surface, 103 - first through hole, 11 - support, 110 - tube wall, 111 - second through hole, 2 - battery, 20 - shell, 21 - cell, 22 - tab, 221 - positive tab, 222 - negative tab, 23 - through hole. DETAILED DESCRIPTION

[0034] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0035] The terms "first", "second" in the specification and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in a "or" relationship.

[0036] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0037] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0038] The embodiment of the application provides a current collecting plate assembly. In actual application, the current collecting plate assembly 1 is used for a battery, and the battery can be a lithium ion secondary battery, a lithium ion primary battery, a lithium ion secondary battery monomer, a lithium ion primary battery monomer, a lithium-sulfur battery monomer, a sodium lithium ion battery monomer, a sodium ion battery monomer or a magnesium ion battery monomer, and the embodiment of the application does not make specific limitation.

[0039] The cylindrical battery usually includes a shell, an electrode core and a support. The electrode core includes a positive electrode sheet, a negative electrode sheet and a separator. The battery mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work, and the electrode core usually has a through hole to improve the impregnation effect of the electrolyte on the electrode core. However, during the cyclic use of the battery, the thickness of the electrode sheet will gradually increase with the cycle process, and the shell has a large binding force on the electrode core, so that after the expansion of the electrode sheet, the through hole direction collapses, so that the separator near the through hole is extruded and deformed or is cut by the electrode sheet, causing serious safety problems. Moreover, the heat dissipation capacity at the through hole position of the battery is poor, and heat dissipation needs to be carried out through the through hole, and the collapse in the through hole causes the through hole to be blocked, and heat transfer cannot be carried out, causing heat runaway problems. In order to avoid the above problems, the prior art usually provides a support at the through hole, and the support supports the through hole, thereby improving the safety problems and heat runaway problems caused by the collapse in the through hole of the battery during the use of the battery.

[0040] Reference Figure 1, shows a structural schematic diagram of a current collecting plate assembly according to an embodiment of the present application. Specifically, the current collecting plate assembly 1 comprises: a current collecting plate body 10; a support 11 connected to the current collecting plate body 10 and protruding from an outer surface of the current collecting plate body 10, at least part of the support 11 being adapted to extend into a cell hole of the battery 2; wherein the current collecting plate body 10 and the support 11 are in an integrated structure.

[0041] In the embodiment of the present application, the current collecting plate body 10 and the support 11 are arranged in an integrated structure, so that in the welding process, only the current collecting plate body 10 needs to be welded with the cell of the battery, and the support 11 does not need to be welded, thereby simplifying the welding process in the battery.

[0042] As shown in Figure 1 , the current collecting plate body 10 comprises a first surface 101 and a second surface 102 arranged oppositely along the thickness direction, the second surface 102 being adapted to electrically connect the cell of the battery 2, and the support 11 is connected to the second surface 102 and protrudes from the second surface 102.

[0043] In a specific application, the current collecting plate body 10 and the support 11 are in an integrated structure, and are installed in the battery, the protruding part of the support 11 on the second surface 102 of the current collecting plate body 10 extends into the cell hole, the support 11 can support the cell hole, and the second surface 102 of the current collecting plate body 10 is electrically connected to the cell 21.

[0044] In the embodiment of the present application, the current collecting plate body 10 and the cell hole need to be coaxially arranged and cannot be eccentric, and the current collecting plate body 10 and the support 11 are in an integrated structure, so that when the current collecting plate assembly 1 is installed, the support 11 is inserted into the cell hole at the same time, and the position of the current collecting plate body 10 is also limited at the center position of the cell hole, so that in the welding process, the position of the current collecting plate body 10 does not need to be fixed by a welding positioning clamp, the deviation of the position of the current collecting plate from the center can be avoided, and the welding process is simplified.

[0045] As shown in Figure 1 , the current collecting plate body 10 has a first through hole 103; the support 11 is in a tubular structure, the tubular structure comprises a tube wall 110 and a second through hole 111 connected in the tube wall 110, and the first through hole 103 and the second through hole 111 are in communication for heat dissipation.

[0046] In actual application, the second through hole 111 on the support 11 and the first through hole 103 on the current collector body 10 are in communication with each other, when hot gas is generated near the current collector body 10, the hot gas can be transmitted by the second through hole 111, and the transmission speed of the hot gas can be improved. Moreover, when the support 11 is located in the cell hole, the support 11 occupies a small part of the internal space of the cell hole, thereby reducing the space size for transmitting the hot gas. By arranging the second through hole 111 on the support 11, the hot gas can be transmitted through the second through hole 111, the space size for transmitting the hot gas is improved, thereby better improving the problem of the collapse of the middle of the cell of the battery and the problem of the hot gas being unable to be dissipated due to the blockage of the cell hole caused by the collapse of the cell, so that the hot gas generated by the battery can be timely transmitted through the cell hole, and the problem of thermal runaway of the battery can be effectively improved.

[0047] In some embodiments of the present application, the aperture of the first through hole 103 is larger than the aperture of the second through hole 111.

[0048] Specifically, the first through hole 103 penetrates the current collector body 10 along the thickness direction of the current collector body 10, and the aperture of the first through hole 103 refers to the diameter of the first through hole 103 of the current collector body 10. The second through hole 111 penetrates the support 11 along the thickness direction of the current collector body 10, and the aperture of the second through hole 111 refers to the diameter of the second through hole on the support 11. The shapes of the first through hole 103 and the second through hole 111 can be linear, square holes, variously shaped holes, etc., which are not limited in the embodiments of the present application.

[0049] In specific application, since the aperture of the first through hole 103 is larger than the aperture of the second through hole 111, when hot gas is generated near the current collector body 10, the hot gas can be more quickly transmitted from the first through hole 103 into the second through hole 111, the hot gas can be more quickly transmitted through the second through hole 111, the transmission speed of the hot gas is further improved, and the problem of thermal runaway of the battery is better improved.

[0050] Optionally, the material of the pipe wall 110 is a metal material.

[0051] In actual application, the material of the pipe wall 110 of the support 11 is a metal material, the rigidity of the metal material is high, the supporting capacity of the support 11 can be improved, thereby the cell hole can be better supported, and the cell hole can be kept unobstructed. In addition, since the heat conduction performance of the metal material is good, the heat generated at the current collector body 10 can be transmitted through the support 11 made of the metal material, so that the support 11 can also dissipate heat, and the problem of thermal runaway of the battery is better improved.

[0052] Specifically, the metal material of the support 11 can be a metal material such as copper, aluminum and alloys thereof, and the material of the current collector body 10 is the same as that of the support 11.

[0053] Optionally, the pipe wall 110 is a mesh structure.

[0054] In practical applications, by setting the pipe wall 110 of the support 11 as a mesh structure, the entire mesh structure has multiple through holes around the second through hole 111, so that hot air at any position inside the support 11 away from the outer surface of the second through hole 111 can flow into the second through hole 111 through the mesh structure and be transmitted through the second through hole 111, thereby enabling hot air at any position around the support 11 to be transmitted, which better improves the thermal runaway problem of the battery.

[0055] Optionally, the wall thickness of the pipe wall 110 is 0.3-0.6 mm.

[0056] In specific applications, the wall thickness of the pipe wall 110 of the support 11 is set to 0.3-0.6 mm. When the wall thickness of the support 11 is too small, the support ability of the support 11 is affected, the support 11 cannot well support the cell 21, and internal collapse of the cell 21 is caused. When the wall thickness of the support 11 is too large, the support 11 occupies too much internal space of the cell hole, the space size for transmitting hot air is too small, and the transmission of hot air is affected. In practical applications, when the wall thickness of the pipe wall 110 of the support 11 is in the range of 0.3-0.6 mm, the support ability of the support 11 can be met, and the problem of affecting the flow speed of hot air due to too large wall thickness can be improved.

[0057] The application also provides a battery. Figure 2 The application provides a battery. Figure 3 The application provides a battery.

[0058] The battery 2 specifically can include: a shell 20; a cell 21 located in the shell 20 and having a through hole 23; and the current collector plate assembly 1 described in any of the above embodiments, the current collector plate body 10 is connected to the cell 21, and the support 11 at least partially extends into the through hole 23 to support the cell 21.

[0059] Specifically, the shell 20 is a component for forming an internal environment of the battery 2, and the formed internal environment can be used to accommodate the battery cell 21, electrolyte and other components. The shell 20 can further include a cover plate arranged at an opening of the shell 20, and the shell 20 and the cover plate can be independent components. An opening can be arranged on the shell 20, and the cover plate can be arranged to cover the opening to form the internal environment of the battery 2. Alternatively, the cover plate and the shell 20 can be integrated, and specifically, the cover plate and the shell 20 can be formed into a common connecting surface before other components are arranged in the shell. The size of the shell 20 can be determined according to the specific shape and size of the battery cell 21. The material of the shell 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application are not limited in this regard.

[0060] Specifically, the battery cell 21 is a component for generating an electrochemical reaction of the battery 2. The battery cell 21 includes a battery cell body and a tab 22 connected to the battery cell body. The battery cell body includes a positive electrode sheet, a negative electrode sheet and an insulating separator. A battery cell hole is arranged at a central position of the battery cell body, and the positive electrode sheet, the negative electrode sheet and the insulating separator are arranged around the battery cell hole. The part of the positive electrode sheet with active material constitutes a positive electrode current collector, and the part of the negative electrode sheet with active material constitutes a negative electrode current collector.

[0061] In some optional embodiments of the present application, the battery cell 21 is wound to form a winding direction along the axial direction of the battery cell 21. The size of the support 11 is L1, and the size of the battery cell 21 is L2. The relationship between L1 and L2 satisfies: 1 / 5*L2

[0062] Specifically, L1 is the length of the support 11 along the axial direction of the battery cell 21, and L2 is the length of the battery cell 21 along the axial direction of the battery cell 21. In actual application, if the length of the support 11 is too long, the heat generated by the support 11 itself will be too large, and in addition to the heat generated by the battery cell 21 itself, the additional temperature rise caused by the heat generated by the support 11 itself will be caused. If the length of the support 11 is too small, the contact area between the support 11 and the through hole 23 will be too small, and the support ability of the support 11 to the battery cell 21 will not be enough. When the length of the support 11 satisfies 1 / 5*L2

[0063] For example, when the length L2 of the battery cell 21 is 40 mm, the length L1 of the support 11 can be 8 mm≤L1≤20 mm, and the length L1 of the support 11 can be 8 mm, 9 mm, 10 mm, 11 mm, …, 19 mm, or 20 mm.

[0064] Optionally, the battery cell 21 includes a tab 22, and the tab 22 is electrically connected to the current collector body 10.

[0065] In actual applications, the part of the electrode tab in the battery cell 21 without active material constitutes the tab 22, the tab 22 is located at the end of the battery cell 21, and the current collector body 10 is welded to the tab 22. Since welding is a common and relatively firm connection method, the current collector body 10 can be firmly connected to the tab 22, so that the current collector body 10 can well collect and output the current generated by the electrode active material.

[0066] Specifically, the area of the current collector body 10 can be the same as or different from the area of the end surface of the battery cell 21, and the current collector body 10 can cover or partially cover the end surface of the battery cell 21. The current collector body 10 can be made of copper, aluminum, or other metal materials, so that the current collector body 10 has good electrical conductivity and structural strength. The current collector body 10 can be in a plate shape to reduce the space size occupied by the current collector body 10.

[0067] As shown in FIG. 2, Figure 2 Optionally, the tab 22 includes a positive tab 221 and a negative tab 222, and the positive tab 221 and the negative tab 222 are respectively located at two ends of the battery cell 21 along the axial direction of the battery cell. The tab with lower heat generation among the positive tab 221 and the negative tab 222 is a target tab, and the current collector body 10 is electrically connected to the target tab.

[0068] Specifically, the part of the positive electrode tab of the battery cell 21 without active material constitutes the positive tab 221, and the part of the negative electrode tab without active material constitutes the negative tab 222. The positive tab 221 and the negative tab 222 can be located at one end of the battery cell 21 or respectively located at two ends of the battery cell 21. During use of the battery 2, the positive tab 221 and the negative tab 222 generate heat, and the generated heat is different.

[0069] In actual applications, by welding the current collector body 10 to the target tab with lower heat generation among the positive tab 221 and the negative tab 222, the battery 2 can avoid excessive heat on one side, and balance the temperature distribution between the positive and negative tabs of the battery 2.

[0070] Exemplarily, the positive tab 221 and the negative tab 222 of the battery 2 are located at two ends of the battery cell 21, when the battery is subjected to large-rate charging and discharging, the heat generated by the positive tab 221 relative to the negative tab 222 is low, the target tab is the positive tab 221, and the current collector disc body 10 is welded on the positive tab 221.

[0071] It should be noted that in the embodiments of the present application, the structure of the current collector disc assembly is the same as that of the current collector disc assembly in any of the above embodiments, and the beneficial effects are similar, which will not be repeated here.

[0072] The embodiments of the present application also provide a power consumption device, which can specifically include the battery of any of the above embodiments.

[0073] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or an extended range automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above power consumption device.

[0074] It should be noted that in the embodiments of the present application, the structure of the battery is the same as that of the battery in any of the above embodiments, and the beneficial effects are similar, which will not be repeated here.

[0075] In summary, the current collector disc assembly in the embodiments of the present application can at least have the following advantages:

[0076] In the embodiments of the present application, the current collector disc body 10 and the support 11 are arranged as an integrated structure, so that in the welding process, only the current collector disc body 10 and the battery cell 21 need to be welded together, without welding the support 11, thereby simplifying the welding process in the battery. Moreover, the current collector disc body 10 and the battery cell hole need to be coaxially placed and cannot be eccentric, and the current collector disc body 10 and the support 11 are an integrated structure, so that when the current collector disc assembly 1 is installed, the support 11 is inserted into the battery cell hole at the same time, and the position of the current collector disc body 10 is also limited at the center position of the battery cell hole, so that in the welding process, the position of the current collector disc body 10 does not need to be fixed by a welding positioning clamp, and the position of the current collector disc body 10 can be avoided from deviating from the center, thereby simplifying the welding process.

[0077] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0078] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A current collecting plate assembly, applied to a battery, characterized in that: The collecting plate assembly comprises: The collecting plate body; and a support member connected to the collecting disc body and protruding from an outer surface of the collecting disc body, wherein at least a portion of the support member is adapted to extend into the cell hole of the battery; Wherein, the collecting plate body and the supporting member are an integrally formed structure.

2. The collecting plate assembly according to claim 1, characterized in that: The collecting plate body includes a first surface and a second surface oppositely arranged in a thickness direction, the second surface is suitable for electrically connecting to the battery cell of the battery, and the support member is connected to the second surface and protrudes from the second surface.

3. The collecting plate assembly according to claim 1, characterized in that: The collecting plate body has a first through hole; The support member is a tubular structure, which includes a tube wall and a second through hole located in the tube wall, and the first through hole is connected to the second through hole.

4. The collecting plate assembly according to claim 3, characterized in that: The aperture of the first through hole is larger than the aperture of the second through hole.

5. The collecting plate assembly according to claim 3, characterized in that: The material of the tube wall is metal material.

6. The collecting plate assembly according to claim 4, characterized in that: The tube wall is a mesh structure.

7. The collecting plate assembly according to claim 3, characterized in that: The wall thickness of the tube is 0.3 mm to 0.6 mm.

8. A battery, characterized in that: The battery comprises: case; a battery core, the battery core being located in the housing and having a through hole; And the collecting plate assembly according to any one of claims 1 to 7, wherein the collecting plate body is connected to the battery core, and the support member at least partially extends into the through hole to support the battery core.

9. The battery according to claim 8, characterized in that The battery cell is wound, and along the axial direction of the battery cell winding, the size of the support member is L1, the size of the battery cell is L2, and the relationship between L1 and L2 satisfies: 1 / 5*L2<L1<1 / 2*L2, wherein L1 and L2 are measured in the same unit.

10. The battery according to claim 8, characterized in that The battery core includes a tab, and the tab is electrically connected to the current collecting plate body.

11. The battery according to claim 10, characterized in that The tabs include a positive tab and a negative tab; Along the axial direction of the battery core, the positive electrode tab and the negative electrode tab are respectively located at two ends of the battery core; The target electrode tab is the one that generates less heat between the positive electrode tab and the negative electrode tab, and the current collecting plate body is electrically connected to the target electrode tab.

12. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 8 to 11.

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