Secondary battery

Abstract

The present application relates to a secondary battery. The secondary battery comprises a shell, an electrode unit and a cover plate assembly, the cover plate assembly comprises an electrode conductor, an adapter plate, a first plastic part and a cover plate, and at least one first through hole is formed in the cover plate; the first plastic part is arranged on the side, away from the electrode unit, of the cover plate, and at least one second through hole is formed in the first plastic part; the switching piece is arranged on one side, deviating from the cover plate, of the first plastic part and is fixedly connected with the cover plate through the first plastic part; the electrode conductor is arranged on one side, deviating from the cover plate, of the adapter plate and is conductively connected with the adapter plate; the first through hole and the second through hole are used for enabling the tabs to pass through in sequence, so that the tabs are conductively connected with the adapter plate. According to the secondary battery, the adapter plate is arranged on the outer side of the cover plate, and the tabs extend out of the outer side of the cover plate, so that the internal space occupation is reduced, and the short-circuit risk is reduced.

Description

Technical Field

[0001] This application relates to the field of batteries, specifically to a secondary battery. Background Technology

[0002] A secondary battery, also known as a rechargeable battery or storage battery, is a battery that can be recharged after being discharged to reactivate its active materials and continue to be used. Secondary batteries are widely used in computers, mobile phones, and other fields, and with the maturity of manufacturing technology, they are also widely used in electric bicycles, electric vehicles, and energy storage facilities.

[0003] A secondary battery consists of a casing, electrode units, a cover assembly, and adapter plates. In practical use, the positive and negative electrodes of the electrode units need to be led out using a metal conductor called a tab. Currently, in the battery assembly process, the tabs are typically connected to the top cover by first welding them to the adapter plate, and then assembling the tabs to the top cover using the adapter plate. With this connection method, both the tabs and the adapter plate are located inside the casing, occupying internal battery space. Furthermore, the tabs and adapter plate are prone to contact with the positive and negative electrodes of the electrode units, potentially causing short circuits and posing a safety risk. Utility Model Content

[0004] The technical problem to be solved by this application is that current secondary batteries have poor safety because the adapter and tabs are located inside the casing, which occupies a lot of internal space.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is a secondary battery, including a casing, an electrode unit, and a cover plate assembly. The casing has openings on opposite sides. The electrode unit has two opposite tabs, with tabs of different polarities extending from the two tabs and extending toward the two openings respectively. The cover plate assembly is disposed at at least one opening of the casing. The cover plate assembly includes: an electrode conductor, an adapter piece, a first plastic component, and a cover plate. The cover plate has at least one first through hole. The first plastic component is disposed on the side of the cover plate opposite to the electrode unit, and has at least one second through hole. The adapter piece is disposed on the side of the first plastic component opposite to the cover plate and is fixedly connected to the cover plate via the first plastic component. The electrode conductor is disposed on the side of the adapter piece opposite to the cover plate and is electrically connected to the adapter piece. The first through hole and the second through hole allow the tabs to pass through sequentially to electrically connect the tabs to the adapter piece.

[0006] In one embodiment of this application, the adapter plate has at least one third through hole. The first through hole, the second through hole and the third through hole are used to allow the electrode tab to pass through and bend sequentially. The bent portion of the electrode tab is in close contact with the adapter plate to make an conductive connection with the adapter plate.

[0007] In one embodiment of this application, the adapter plate includes a groove having a bottom surface and sidewalls surrounding the bottom surface, the third through hole being formed on the bottom surface, and the bent portion of the electrode lug being in close contact with the bottom surface.

[0008] In one embodiment of this application, the electrode conductor is at least partially located within the groove, and the outer peripheral wall of the electrode conductor is at least partially abutted and welded to the inner surface of the sidewall of the groove; and / or

[0009] Alternatively, the sidewall has a top surface, the electrode conductor overlaps the top surface, and the electrode conductor is welded to the top surface.

[0010] In one embodiment of this application, a sealing ring is further included, which is located in the groove and surrounds the third through hole, and the sealing ring is pressed between the electrode conductor and the bottom surface of the groove.

[0011] In one embodiment of this application, the wall of the first through hole has an insulating material.

[0012] In one embodiment of this application, a tab insulating member is further included, which is used to surround the outer periphery of the tab and is inserted together with the tab into the first through hole and the second through hole.

[0013] In one embodiment of this application, the electrode insulating member has a first height along a first direction, and the electrode has a second height along the first direction, wherein the second height is greater than the first height.

[0014] In one embodiment of this application, a second plastic component is further included. The second plastic component is disposed on the side of the cover plate opposite to the first plastic component. A fourth through hole is provided on the second plastic component for the electrode tab to pass through it.

[0015] In one embodiment of this application, the cover plate assembly includes a positive electrode cover plate assembly and a negative electrode cover plate assembly, which are respectively disposed at the two openings of the housing.

[0016] This application discloses a secondary battery in which a cover plate, a first plastic component, and an adapter plate are sequentially arranged from the inside out of the electrode unit. Through holes are formed in the cover plate and the first plastic component, allowing the tabs extending from the output end to pass through the through holes in the cover plate and then through the through holes in the first plastic component to make conductive connections with the adapter plate. This design alleviates and solves the problem of tabs and the adapter plate occupying internal battery space, improving battery capacity and performance. Furthermore, tabs of different polarities extend from opposite ends of the electrode unit, allowing for wider tabs, closer to full tab configuration, and enhancing the battery's overcurrent capacity. Attached Figure Description

[0017] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings, wherein:

[0018] Figure 1 An explosion diagram of a secondary battery according to an embodiment of this application is shown;

[0019] Figure 2 It shows Figure 1 A cross-sectional view along the DD direction of the embodiment shown;

[0020] Figure 3 A three-dimensional structural schematic diagram of a positive electrode cover plate assembly according to an embodiment of this application is shown;

[0021] Figure 4 It shows Figure 3 A front view of the positive electrode cover assembly of the illustrated embodiment;

[0022] Figure 5 It shows Figure 3 A top view of the positive electrode cover plate assembly of the illustrated embodiment;

[0023] Figure 6 A schematic diagram of the connection between the positive electrode tab and the positive electrode cover plate assembly according to an embodiment of this application is shown. Detailed Implementation

[0024] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0025] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein, and therefore this application is not limited to the specific embodiments disclosed below.

[0026] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "an," and / or "the" are not specifically singular and may include plural forms. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0027] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0028] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application. In addition, although the terminology used in this application is selected from commonly known and used terms, some terms mentioned in this application's specification may have been chosen by the applicant according to his or her judgment, and their detailed meanings are explained in the relevant sections of this description. Moreover, this application should be understood not only through the actual terms used, but also through the meaning implied by each term.

[0029] The embodiments of this application will now be described based on the accompanying drawings. However, the embodiments shown below are examples of secondary batteries used to embody the technical concept of this application, and the secondary battery of this application is not specifically defined as described below. Furthermore, in order to facilitate understanding of the scope of the claims, the components corresponding to those shown in the embodiments are assigned numbers to the components shown in the "Claims" and "Utility Model Content" columns. However, this is by no means to specify the components shown in the claims as components of the embodiments. In particular, the dimensions, materials, shapes, and relative arrangements of the constituent components described in the embodiments, unless specifically stated, are not intended to limit the scope of this application, but are merely illustrative examples.

[0030] However, the dimensions or positional relationships of the components shown in the accompanying drawings are sometimes exaggerated for clarity. Therefore, in the following description, detailed descriptions of the same names and symbols representing the same or homogeneous components are appropriately omitted. Furthermore, the elements constituting this application may be multiple elements composed of the same components, thus allowing one component to function as multiple elements; conversely, multiple components may share the function of one component. Additionally, the content described in some embodiments and implementations can be applied to other embodiments and implementations. Furthermore, in this specification, "upper" is not limited to the case of being formed in contact with an upper surface, but also includes the case of being formed separately on top, and also includes the meaning of an intermediate layer between layers.

[0031] Figure 1 An explosion diagram of a secondary battery according to an embodiment of this application is shown. Figure 1 As shown, this application discloses a secondary battery 1000, including a housing 100, electrode units 200, and a cover assembly. The housing 100 houses the electrode units, and openings 101 are provided on opposite sides of the housing 100. The cover assembly is disposed at the openings 101 of the housing 100, forming a closed battery structure together with the housing 100. The electrode unit 200 has two oppositely disposed tabs, such as... Figure 1 The first end 201 and the second end 202 of the device have tabs extending from the first end 201 and the second end 202, respectively, and extending toward the two openings 101. The tab located at the positive electrode is the positive tab 210, and the tab located at the negative electrode is the negative tab (not shown in the figure). Figure 1 In the illustrated embodiment, the cover assembly includes a positive electrode cover assembly 310 and a negative electrode cover assembly 320, which are respectively disposed at two openings 101 of the housing 100. In other embodiments, the secondary battery 1000 has the cover assembly of this application disposed at only one opening 101 of the housing 100, while a cover assembly of other structures may be disposed at the other opening 101.

[0032] like Figure 1 As shown, in some embodiments, the secondary battery 1000 further includes a Mylar membrane 400 covering the periphery of the electrode unit 200. The Mylar membrane may be made of an insulating material to isolate and protect the electrode unit 200.

[0033] In the secondary battery 1000 disclosed in this application, the cover assembly includes: an electrode conductor, an adapter piece, a first plastic part, and a cover plate. The cover plate has at least one first through hole; the first plastic part is disposed on the side of the cover plate opposite to the electrode unit, and has at least one second through hole; the adapter piece is disposed on the side of the first plastic part opposite to the cover plate and is fixedly connected to the cover plate via the first plastic part; the electrode conductor is disposed on the side of the adapter piece opposite to the cover plate and is electrically connected to the adapter piece; the first and second through holes allow electrode tabs to pass through them sequentially to electrically connect the electrode tabs to the adapter piece.

[0034] In the cover plate assembly disclosed in this application, both the first plastic part and the adapter piece are located on the outside of the cover plate, i.e., outside the housing, saving internal space of the housing. Furthermore, by creating through holes in the cover plate and the first plastic part, the tabs extending from the output end can first pass through the through holes in the cover plate into the first plastic part before connecting to the adapter piece. This alleviates and solves the problem of the tabs and adapter piece occupying internal space, improving battery capacity and performance. Moreover, tabs of different polarities extend from opposite ends of the electrode unit. This design allows for wider tabs, more closely resembling full tabs, resulting in stronger overcurrent capacity of the battery.

[0035] In some embodiments, the adapter plate has at least one third through hole, and the first through hole, the second through hole and the third through hole are used to allow the electrode tab to pass through and bend in sequence, and the bent part of the electrode tab is in close contact with the adapter plate to make conductive connection with the adapter plate.

[0036] Specifically, the above-described cover plate assembly is described below with reference to specific embodiments.

[0037] like Figure 1 As shown, the cover assembly includes a positive electrode cover assembly 310 and a negative electrode cover assembly 320. In some embodiments, the positive electrode cover assembly 310 and the negative electrode cover assembly 320 may have the same structure. In some embodiments, the positive electrode cover assembly 310 and the negative electrode cover assembly 320 may also have different structures. This specification mainly uses the positive electrode cover assembly 310 as an example, and combines it with... Figure 1 , Figure 3 and Figure 4 The structure of the cover plate assembly is described. The same description can be used to explain the negative electrode cover plate assembly 320. Among them, Figure 3 The three-dimensional structure of a positive electrode cover plate assembly 310 according to an embodiment of this application is shown. Figure 4 yes Figure 3 The front view of the structure of the positive electrode cover assembly 310 shown.

[0038] like Figure 1 and Figure 4As shown, in some embodiments, the positive electrode cover assembly 310 includes: a positive electrode conductor 311, a positive electrode adapter piece 312, a first positive electrode plastic part 313, and a positive electrode cover 314. In some embodiments, the positive electrode cover assembly 310 further includes: a second positive electrode plastic part 315 and a positive electrode sealing ring 316. In some embodiments, the positive electrode conductor 311 in the positive electrode cover assembly 310 is a positive electrode aluminum block, and the negative electrode conductor 321 in the negative electrode cover assembly 320 can be a copper-aluminum composite block.

[0039] Figure 4 The relative relationship between the positive electrode adapter 312, the positive electrode cover plate 314, and the first positive electrode plastic component 313 is shown: the first positive electrode plastic component 313 is disposed between the positive electrode adapter 312 and the positive electrode cover plate 314. During manufacturing, the positive electrode adapter 312 and the positive electrode cover plate 314 are first prepared as a semi-finished top cover by injection molding, wherein the first positive electrode plastic component 313 is disposed in the space between the positive electrode adapter 312 and the positive electrode cover plate 314 by injection molding. The cover plate assembly of this application is connected to the positive electrode cover plate 314 by injection molding, simplifying the assembly process and improving battery assembly production efficiency.

[0040] In some embodiments, the positive electrode cover plate 314 has at least one first through hole, the positive electrode first plastic part 313 has at least one second through hole, and the positive electrode adapter piece 312 has at least one third through hole 3122. Figure 5 The third through hole 3122 is shown; the first and second through holes are both below the third through hole 3122 (not shown). In some embodiments, a second positive electrode plastic component 315 is also provided below the positive electrode cover plate 314. The second positive electrode plastic component 315 can be fixed to the underside of the positive electrode cover plate 314 by heat fusion or adhesive bonding. It is understood that in some embodiments, a fourth through hole (not shown) for the tab to pass through can also be formed on the second plastic component 315.

[0041] like Figure 3 As shown, in some embodiments, the positive electrode adapter 312 has a groove 3121, the groove 3121 having a bottom surface 3121a and a sidewall 3121b surrounding the bottom surface 3121a, the sidewall 3121b having a top surface 3121b1. Figure 6 As shown, the first through hole, the second through hole, and the third through hole 3122 are used to allow at least one positive electrode tab 210 with its output end protruding through it to pass through and bend in sequence. The bent part of the positive electrode tab 210 is in close contact with the bottom surface 3121a of the groove 3121 of the positive electrode adapter 312 to make conductive connection with the positive electrode adapter 312.

[0042] like Figure 1 and Figure 4As shown, in some embodiments, the positive electrode conductor 311 is disposed on the side of the positive electrode adapter 312 opposite to the positive electrode cover plate 314, and is electrically connected to the positive electrode adapter 312. Specifically, as... Figure 2 As shown, the positive electrode conductor 311 is at least partially located within the groove 3121. The outer peripheral wall of the positive electrode conductor 311 is at least partially attached to and welded to the inner surface of the side wall of the groove 3121. During assembly, the positive electrode conductor 311 is seam-welded to the side wall of the groove 3121. In other embodiments, the positive electrode conductor 311 may also be overlapped on the top surface 3121b1, and during assembly, the positive electrode conductor 311 is welded to the top surface 3121b1. In some embodiments, the positive electrode conductor 311 and the positive electrode adapter 312 can be various highly conductive materials, including aluminum.

[0043] like Figure 1 and Figure 2 As shown, in some embodiments, a positive electrode sealing ring 316 is provided in the groove 3121, and the positive electrode sealing ring 316 is arranged around the third through hole 3122 of the positive electrode adapter piece 312. That is, all the third through holes 3122 on the positive electrode adapter piece 312 are located inside the ring of the positive electrode sealing ring 316. The positive electrode sealing ring 316 is pressed between the positive electrode conductor 311 and the bottom surface 3121a of the groove 3121 to provide a sealing effect.

[0044] In some embodiments, the walls of the first through hole are covered with an insulating material. For example, the walls of the hole are covered with an insulating material by spraying, thereby achieving insulation between the tab and the cover plate.

[0045] like Figure 1 As shown, in some embodiments, the positive electrode cover assembly 310 further includes a positive electrode tab insulator 317, which surrounds the outer periphery of the positive electrode tab 210 and passes through the first through hole, the second through hole, and the third through hole 3122 together with the positive electrode tab 210. Figure 2 As shown, the positive electrode tab insulator 317 has a first height along the first direction D1, and the positive electrode tab 210 has a second height along the first direction D1, and the second height is greater than the first height. Therefore, after the positive electrode tab 210 is surrounded by the positive electrode tab insulator 317, a section of it still protrudes outside the positive electrode tab insulator 317 for subsequent connection with the positive electrode adapter 312. Figure 5 and Figure 6 A top view of the positive electrode cover assembly structure before and after the use of the positive electrode tab insulator 317 is shown. Figure 5 The positive electrode tab insulator 317 is not included. Figure 6 This includes the positive electrode tab insulator 317. For example... Figure 6As shown, the positive electrode tab insulator 317 is a tab clamp. The top cross-sectional view of the positive electrode tab insulator 317 can be a U-shaped structure, into which the positive electrode tab 210 can be inserted. In some embodiments, the positive electrode tab 210 is first placed in the opening of the positive electrode tab insulator 317 and adheres to it, i.e., clamped by the positive electrode tab insulator 317. Then, the positive electrode tab insulator 317 and the positive electrode tab 210 together pass through the first through hole and the second through hole 3122. In other embodiments, the positive electrode tab insulator 317 can be insulating tape, adhered to the outer surface of the tab.

[0046] In some embodiments, the positive electrode tab insulator 317 has an insulating function to insulate the positive electrode tab 210 and the positive electrode cover plate 314.

[0047] like Figure 1 As shown, the negative electrode cover plate assembly 320 includes a negative electrode sealing ring 326 and a negative electrode tab insulator 327.

[0048] This application discloses a secondary battery 1000, in which a cover plate, a first plastic part, and an adapter piece are sequentially arranged from the inside out of the electrode unit. Through holes are formed in the cover plate, the first plastic part, and the adapter piece, allowing the tabs extending from the output end to pass through the through holes in the cover plate and then through the through holes in the first plastic part to make conductive connections with the adapter piece. This design alleviates and solves the problem of the tabs and adapter piece occupying internal space in the secondary battery. Insulating material is provided on the wall of the first through hole, or a tab insulator is used, to achieve insulation between the tab and the cover plate, reducing the risk of short circuits. This application also uses injection molding to place the adapter piece above the cover plate, achieving an integrated design of the adapter piece and the cover plate, simplifying the assembly process and improving battery assembly production efficiency.

[0049] While some embodiments that are currently considered useful have been discussed in the foregoing disclosure by way of various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. Rather, the claims are intended to cover all modifications and equivalent combinations that conform to the substance and scope of the embodiments of this application.

[0050] Similarly, it should be noted that, in order to simplify the description of this application and thus aid in the understanding of one or more embodiments, the foregoing description of this embodiment sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiment disclosed above.

[0051] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed depending on the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible.

Claims

1. A secondary battery, characterized in that, Includes a housing, electrode units, and a cover plate assembly, wherein, The shell has openings on opposite sides; The electrode unit has two opposing tabs, with tabs of different polarities extending from the two tabs and extending toward the two openings respectively. The cover plate assembly is disposed at at least one opening in the housing, and the cover plate assembly includes: an electrode conductor, an adapter piece, a first plastic part, and a cover plate, wherein... At least one first through hole is provided on the cover plate; The first plastic part is disposed on the side of the cover plate away from the electrode unit, and at least one second through hole is provided on the first plastic part; The adapter piece is disposed on the side of the first plastic part away from the cover plate, and is fixedly connected to the cover plate through the first plastic part; The electrode conductor is disposed on the side of the adapter plate away from the cover plate and is electrically connected to the adapter plate. The first through hole and the second through hole are used to allow the electrode tabs to pass through sequentially to make the electrode tabs electrically connected to the adapter piece.

2. The secondary battery as described in claim 1, characterized in that, The adapter plate has at least one third through hole. The first through hole, the second through hole and the third through hole are used to allow the electrode tab to pass through and bend in sequence. The bent part of the electrode tab is in close contact with the adapter plate to make a conductive connection with the adapter plate.

3. The secondary battery as described in claim 2, characterized in that, The adapter plate includes a groove having a bottom surface and sidewalls surrounding the bottom surface, the third through hole being formed on the bottom surface, and the bent portion of the electrode lug being in close contact with the bottom surface.

4. The secondary battery as described in claim 3, characterized in that, The electrode conductor is at least partially located within the groove, and the outer peripheral wall of the electrode conductor is at least partially attached to and welded to the inner surface of the side wall of the groove; and / or, the side wall has a top surface, the electrode conductor overlaps the top surface, and the electrode conductor is welded to the top surface.

5. The secondary battery as described in claim 4, characterized in that, It also includes a sealing ring, which is located in the groove and surrounds the third through hole, and the sealing ring is pressed between the electrode conductor and the bottom surface of the groove.

6. The secondary battery as described in claim 1, characterized in that, The wall of the first through hole has an insulating material.

7. The secondary battery as described in claim 1, characterized in that, It also includes a tab insulating component, which is used to surround the outer periphery of the tab and pass through the first through hole and the second through hole together with the tab.

8. The secondary battery as described in claim 7, characterized in that, The electrode insulating member has a first height along a first direction, and the electrode has a second height along the first direction, the second height being greater than the first height.

9. The secondary battery as described in claim 1, characterized in that, It also includes a second plastic component, which is disposed on the side of the cover plate opposite to the first plastic component. The second plastic component has a fourth through hole for the electrode tab to pass through.

10. The secondary battery as described in claim 1, characterized in that, The cover plate assembly includes a positive electrode cover plate assembly and a negative electrode cover plate assembly, which are respectively disposed at the two openings of the housing.

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