Secondary battery and electric device

Abstract

The utility model relates to a secondary battery and electric equipment, and relates to the technical field of batteries, the secondary battery comprises a top cover, a pole, an insulation protection part, an expansion part, a battery cell and a tab; the insulation protection piece is arranged between the top cover and the battery cell, the insulation protection piece is provided with a containing cavity, and the containing cavity is provided with an opening facing the first direction; the pole is arranged on the top cover and penetrates through the insulating protection piece to extend into the accommodating cavity; one end of the tab is connected with the battery cell, and the other end extends into the accommodating cavity from the opening to be connected with the pole; the expansion piece is arranged in the accommodating cavity and is propped between the pole lug and the pole column. According to the secondary battery and the electric equipment, the over-current capability of the battery cell can be improved, so that the battery cell meets the large-current requirement.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a secondary battery and an electrical device. Background Technology

[0002] The current carrying capacity of a battery cell refers to the current intensity that the cell can withstand and handle under specific conditions. The magnitude of the current carrying capacity directly affects the performance and lifespan of the cell. Currently, due to the small welding area between the connecting pieces and the tabs (including cathode and anode tabs) in the battery cell, the current carrying capacity of the cell is relatively small and cannot meet the requirements for high current. Utility Model Content

[0003] To address the aforementioned technical problems, embodiments of this application provide a secondary battery and an electrical device that can improve the overcurrent capacity of the battery cell, enabling the battery cell to meet high current requirements.

[0004] In one aspect, a secondary battery is provided, comprising: a top cover, terminals, insulating protective components, extension components, battery cells, and tabs;

[0005] The insulating protective component is disposed between the top cover and the battery cell, and the insulating protective component has a receiving cavity with an opening facing a first direction;

[0006] The pole is disposed on the top cover and extends through the insulating protective component into the receiving cavity;

[0007] One end of the tab is connected to the battery cell, and the other end extends from the opening into the receiving cavity to connect to the electrode post;

[0008] The extension member is disposed within the receiving cavity, and the extension member abuts between the electrode tab and the electrode post.

[0009] According to a first aspect of this application, the extension includes:

[0010] The base abuts against the pole post;

[0011] A stepped portion is recessed in the base, and the stepped portion is used to hold the electrode tab.

[0012] According to a first aspect of this application, the base and / or the stepped portion are provided with a groove, the groove being filled with a conductive material.

[0013] According to a first aspect of this application, the groove is curved.

[0014] According to a first aspect of this application, the secondary battery further includes an adapter piece disposed within the receiving cavity, one end of the adapter piece being connected to the terminal post and the other end being connected to the tab, and the same side of the extension member abutting against the adapter piece and the tab connected to the adapter piece; the tab connected to the adapter piece is disposed between the adapter piece and the extension member.

[0015] According to a first aspect of this application, the insulating protective element includes:

[0016] An insulating sheet is disposed on one side of the top cover, and the insulating sheet has a through hole for the pole post to pass through;

[0017] A protective sheet, one end of which is rotatably connected to the insulating sheet in a direction perpendicular to the first direction, to form the receiving cavity.

[0018] According to a first aspect of this application, the protective sheet is provided with a mating groove, and at least a portion of the extension is received within the mating groove.

[0019] According to a first aspect of this application, the protective sheet has one of a buckle and a slot at its other end in a direction perpendicular to the first direction, and the insulating sheet has the other of the buckle and the slot, wherein the buckle engages with the slot.

[0020] According to a first aspect of this application, the secondary battery further includes:

[0021] A thermal pad is attached to the side of the insulating protective component facing the battery cell, and the thermal pad is used to adhere to the top wall of the battery cell.

[0022] Secondly, an electrical appliance is also provided, including:

[0023] The secondary battery as described in the previous embodiment.

[0024] The secondary battery and electrical device provided in this application embodiment are connected between the tab and the terminal by an extension member. The extension member is connected in parallel with the original current path (the path through which current is directly transmitted between the tab and the terminal). The current-carrying area after parallel connection is the sum of the current-carrying area through the extension member and the current-carrying area in the original current path. Therefore, the extension member can increase the current-carrying area between the tab and the terminal, thereby improving the current-carrying capacity between the tab and the terminal and improving the overall current-carrying capacity of the battery cell, so that the battery cell can meet the high current requirements. Attached Figure Description

[0025] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0026] Figure 1 This is a schematic diagram of the structure of a secondary battery provided for an exemplary embodiment of this application.

[0027] Figure 2 An exploded schematic diagram of a secondary battery provided for an exemplary embodiment of this application.

[0028] Figure 3 This is a schematic diagram of the structure of a battery cell provided for an exemplary embodiment of this application.

[0029] Figure 4 This is a schematic diagram of the structure of an insulating protective component provided in an exemplary embodiment of this application.

[0030] Figure 5 This is a schematic diagram of the structure of a protective sheet provided for an exemplary embodiment of this application.

[0031] Figure 6 A schematic diagram of the structure of an extension provided for an exemplary embodiment of this application.

[0032] Reference numerals: 100-Secondary battery; 110-Insulating protective component; 111-Receiving cavity; 1111-Opening; 112-Insulating sheet; 1121-Through hole; 113-Protective sheet; 114-Matching groove; 115-Snap-on; 116-Slot; 117-Through hole; 120-Adapter piece; 130-Extension piece; 131-Base; 132-Stepped part; 134-Groove; 140-Thermal pad; 150-Top cover; 160-Terminal post; 170-Shell; 210-Cell; 211-Taper. Detailed Implementation

[0033] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0034] Figure 1 This is a schematic diagram of the structure of a secondary battery provided for an exemplary embodiment of this application. Figure 2 This is a schematic diagram of an explosion of a secondary battery provided as an exemplary embodiment of this application. Figure 1 and Figure 2As shown, the secondary battery 100 provided in this application embodiment may include a top cover 150, an insulating protective component 110, and a battery cell 210. The insulating protective component 110 is disposed between the top cover 150 and the battery cell 210. The top cover 150 can protect the battery cell 210, and the insulating protective component 110 can prevent the top cover 150 from directly contacting the interior of the battery cell 210.

[0035] Figure 3 This is a schematic diagram of the structure of a battery cell provided for an exemplary embodiment of this application. Figure 4 This is a schematic diagram of the structure of an insulating protective member provided for an exemplary embodiment of this application. Figures 1 to 4 As shown, the secondary battery 100 may further include a terminal post 160 and a tab 211. The aforementioned insulating protective member 110 is provided with a receiving cavity 111, which has a direction towards a first direction ( Figure 2 and Figure 4 The opening 1111 (in the directions indicated by arrows A and B) has a terminal post 160 disposed on the top cover 150. The terminal post 160 can pass through the insulating protective member 110 and extend into the receiving cavity 111. One end of the tab 211 is connected to the battery cell 210, and the other end extends into the receiving cavity 111 through the opening 1111. The end of the tab 211 extending into the receiving cavity 111 is connected to the terminal post 160. It can be understood that the tab 211 and the terminal post 160 are connected in the receiving cavity 111, thereby avoiding contact with the battery cell 210 and preventing short circuits.

[0036] It should be understood that the receiving cavity 111 can limit the tab 211 to prevent the tab 211 from being inserted backwards (the actual extension direction of the tab 211 is perpendicular to or offset from the normal assembly direction).

[0037] like Figure 1 , Figure 2 as well as Figure 4 As shown, the secondary battery 100 may further include an extension member 130, which is disposed within the receiving cavity 111 and abuts against the tab 211 and the terminal 160. This allows current to be transferred between the tab 211 and the terminal 160, improving the overcurrent capacity of the secondary battery. The extension member 130, tab 211, and terminal 160 are connected within the receiving cavity 111, improving the reliability of their connection and simplifying the structure for easier manufacturing. It should be noted that the extension member 130 can be detachably abutted against the tab 211 and terminal 160, or it can be welded to them, depending on the requirements.

[0038] It should be noted that in related technologies, the tab 211 is connected to the terminal 160, and the area of ​​the welded joint between the tab 211 and the terminal 160 is the current-carrying area S1. In this embodiment, an extension member 130 is added. The extension member 130 is connected in parallel with the original current path (the path through which the tab 211 and the terminal 160 directly transmit current). The current-carrying area through the extension member 130 is S2, which, when added to the current-carrying area S1 in the original current path, becomes the total current-carrying area S1 + S2. Therefore, the extension member 130 can increase the current-carrying area between the tab 211 and the terminal 160, thereby improving the current-carrying capacity between the tab 211 and the terminal 160, and improving the overall current-carrying capacity of the cell 210, enabling the cell 210 to meet high current requirements.

[0039] like Figure 2 As shown, the secondary battery 100 may also include a housing 170, with the battery cell 210 assembled inside the housing 170, and the top cover 150 connected to the housing 170. The housing 170 provides protection for the battery cell 210.

[0040] like Figure 2 As shown, the secondary battery 100 may further include an adapter piece 120, which is disposed within the receiving cavity 111. One end of the adapter piece 120 is connected to the terminal post 160, and the other end is connected to the tab 211. Current can be transferred between the tab 211 and the terminal post 160 through the adapter piece 120. In this way, the adapter piece 120 can improve the connection stability between the terminal post 160 and the tab 211, ensuring that the tab 211 and the terminal post 160 are always in a conductive state. The adapter piece 120 is welded to both the tab 211 and the terminal post 160, thereby improving connection reliability.

[0041] like Figure 2 As shown, within the receiving cavity 111, the same side of the extension member 130 abuts against the adapter piece 120 and the tab 211 connected to the adapter piece 120. The tab 211 connected to the adapter piece 120 is positioned between the adapter piece 120 and the extension member 130. Thus, on one hand, the adapter piece 120 and the extension member 130 can jointly increase the current-carrying capacity between the tab 211 and the terminal post 160; on the other hand, the contact between the adapter piece 120 and the extension member 130 can improve heat transfer efficiency, facilitating the rapid transfer of heat generated by the battery cell 210 and the tab 211 to the top cover 150, thus promoting rapid heat dissipation. It is understood that after the adapter 120 is connected to the tab 211 and the pole post 160 respectively, the upper side of the adapter 120 is connected to the pole post 160, and the lower side of the adapter 120 is connected to the tab 211. The extension member 130 is disposed below the adapter 120 and the tab 211 connected to the adapter 120, so that the adapter 120 and the tab 211 are connected respectively through the extension member 130.

[0042] In one embodiment, the adapter 120 may not be provided in the secondary battery 100, and the tab 211 and the terminal 160 are directly connected to the extension member 130. The extension member 130 can also increase the current flow capacity between the tab 211 and the terminal 160.

[0043] like Figure 2 As shown, the secondary battery 100 may also include a thermal pad 140, which is attached to the side of the insulating protective member 110 facing the cell 210 and can be attached to the top wall of the cell 210. In this way, on the one hand, the thermal pad 140 can support the insulating protective member 110 above, and on the other hand, compared with air layer heat exchange, the thermal pad 140 can improve the heat exchange efficiency between the cell 210 and the insulating protective member 110.

[0044] like Figure 4 As shown, the insulating protective component 110 may include an insulating sheet 112 and a protective sheet 113. The insulating sheet 112 is disposed on one side of the top cover 150, and one end of the protective sheet 113 in a direction perpendicular to the first direction is rotatably connected to the insulating sheet 112. In practical applications, when it is necessary to assemble the aforementioned adapter piece 120 and extension piece 130, the protective sheet 113 can be rotated from the bottom of the insulating sheet 112 to one end of the insulating sheet 112, so that the adapter piece 120, the tab 211, and the extension piece 130 can be assembled at the bottom of the insulating sheet 112. Then, the protective sheet 113 is rotated to the bottom of the insulating sheet 112, covering the adapter piece 120, the tab 211, and the extension piece 130. The aforementioned receiving cavity 111 is formed between the protective sheet 113 and the insulating sheet 112, and the tab 211, the adapter piece 120, and the extension piece 130 are located within the receiving cavity 111.

[0045] It should be understood that the protective plate 113 can hold the expansion piece 130, the adapter piece 120, and the electrode tab 211 in the receiving cavity 111, thereby improving the reliability of the connection between the three and preventing the expansion piece 130 and the adapter piece 120 from directly contacting the battery cell 210, thus avoiding short circuit accidents.

[0046] In one embodiment, such as Figure 2 As shown, there are two expansion pieces 130, two adapter pieces 120, and two insulating pieces 112. The two expansion pieces 130, two adapter pieces 120, and two insulating pieces 112 correspond one-to-one. One set of expansion pieces 130 and adapter pieces 120 is used to connect the positive terminal post 160 and the electrode tab 211, and the other set of expansion pieces 130 and adapter pieces 120 is used to connect the negative terminal post 160 and the electrode tab 211.

[0047] In one embodiment, the extension member 130 connecting the positive electrode post 160 and the tab 211 can be made of aluminum foil, with a material similar to that of the positive electrode post 160 and the tab 211; the extension member 130 connecting the negative electrode post 160 and the tab 211 can be made of copper foil, with a material similar to that of the negative electrode post 160 and the tab 211. This helps to give the welded structure greater strength and makes it less prone to brittle fracture.

[0048] like Figure 4 As shown, the insulating sheet 112 is provided with a through hole 1121, through which the aforementioned pole post 160 can extend into the receiving cavity 111.

[0049] Figure 5 This is a schematic diagram of the structure of a protective sheet provided for an exemplary embodiment of this application. (See diagram below.) Figure 5 As shown, the protective plate 113 is provided with a mating groove 114, and at least a portion of the extension member 130 is received within the mating groove 114. In this way, the mating groove 114 can limit the position of the protective plate 113, improving the assembly stability of the protective plate 113 within the receiving cavity 111 and reducing the likelihood of the protective plate 113 wobbling within the receiving cavity 111. One side of the extension member 130 abuts against the adapter piece 120 and the electrode tab 211 connected to the adapter piece 120, while the other side abuts against and is received within the mating groove 114, which improves the reliability of the connection between the extension member 130, the adapter piece 120, and the electrode tab 211.

[0050] like Figure 4 and Figure 5 As shown, the protective sheet 113 has a buckle 115 at its other end (opposite to one end of the aforementioned rotatably connected insulating sheet 112) in a direction perpendicular to the first direction, and the insulating sheet 112 has a slot 116. When the protective sheet 113 rotates to the bottom of the insulating sheet 112, forming a receiving cavity 111, the buckle 115 can engage with the slot 116. In this way, the protective sheet 113 and the insulating sheet 112 can be fixed relative to each other, preventing the protective sheet 113 from rotating again, which helps to improve the assembly stability of the components in the receiving cavity 111.

[0051] It should be understood that after the buckle 115 and the slot 116 are engaged, the internal adapter 120, expansion piece 130, part of the tab 211, and part of the post 160 can be completely fitted by the protective plate 113 to reduce internal resistance.

[0052] In one embodiment, the other end of the protective sheet 113 in the direction perpendicular to the first direction (which is opposite to one end of the aforementioned rotatable connecting insulating sheet 112) may be provided with a slot 116, and the insulating sheet 112 may be provided with a buckle 115. The buckle 115 engages with the slot 116, which can also serve to fix the protective sheet 113 and the insulating sheet 112.

[0053] like Figure 5 As shown, the protective sheet 113 is provided with a through hole 117. During the operation of the battery cell 210, the electrolyte inside the battery cell 210 may flow from the bottom to the top of the battery cell 210. During this process, the through hole 117 allows for electrolyte outflow and return, which is beneficial for convective heat transfer between the electrolyte and the top cover 150. Furthermore, in this case, the operating temperature of the battery cell 210 detected by the top cover 150 can be closer to the actual temperature of the battery cell 210, which can improve the accuracy of the temperature detection data.

[0054] In one embodiment, the number of through holes 117 is multiple, which can increase the flow rate of the electrolyte. The through holes 117 are disposed between the snap fastener 115 and the mating groove 114, which facilitates the insulation of the electrical connection position, and at the same time facilitates increasing the number and size of the through holes 117.

[0055] Figure 6 This is a schematic diagram of the structure of an extension provided for an exemplary embodiment of this application. (See diagram below.) Figure 6 As shown, the extension member 130 may include a base 131 and a stepped portion 132. The base 131 abuts against the pole post 160, and the stepped portion 132 is recessed into the base 131. The stepped portion 132 is used to hold the tab 211 and can limit the tab 211, thereby improving the connection stability between the tab 211 and the extension member 130. When there is no adapter piece 120, the base 131 can directly abut against the pole post 160. When the adapter piece 120 is provided, the base 131 indirectly abuts against the pole post 160, and the base 131 directly abuts against the adapter piece 120, thereby ensuring connection reliability.

[0056] like Figure 6 As shown, the base 131 and / or the stepped portion 132 are provided with a groove 134, which is filled with a conductor. In practical applications, a portion of the conductor protrudes from the groove 134. When the adapter piece 120 abuts against the extension piece 130, the conductor ensures effective contact between the adapter piece 120 and the extension piece 130, preventing poor contact due to gaps between them. This ensures that the adapter piece 120 and the extension piece 130 effectively increase the current-carrying capacity between the tab 211 and the post 160. When the tab 211 abuts against the extension piece 130, the conductor ensures effective contact between them, preventing poor contact due to gaps between them. This ensures that the tab 211 and the extension piece 130 effectively increase the current-carrying capacity between the tab 211 and the post 160. When the adapter piece 120 is not set, the conductor is in direct contact with the terminal 160. The principle is the same, so it will not be described again here.

[0057] In one embodiment, the conductor may include a semi-solid conductive material, such as conductive silver paste, which, after being filled into the groove 134, will overflow and protrude from the groove 134.

[0058] like Figure 6 As shown, the groove 134 is curved, which increases the extension path of the conductor, increases the contact area between the conductor and the adapter piece 120, and further ensures effective contact between the adapter piece 120 and the extension piece 130.

[0059] This application also provides an electrical device that includes the secondary battery 100 described in the foregoing embodiments and has all the functions of the secondary battery 100. The beneficial effects of this electrical device can be referred to the beneficial effects of the aforementioned secondary battery 100.

[0060] In one embodiment, the electrical device can be powered by the aforementioned secondary battery. The electrical device can be a vehicle, mobile phone, portable device, laptop, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc. This application does not impose any special limitations on the aforementioned electrical devices.

[0061] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0062] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0063] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0064] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0065] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A secondary battery, characterized in that, include: Top cover (150), pole post (160), insulating protective component (110), extension component (130), battery cell (210) and tab (211); The insulating protective component (110) is disposed between the top cover (150) and the battery cell (210), and the insulating protective component (110) is provided with a receiving cavity (111), the receiving cavity (111) having an opening (1111) facing a first direction; The pole post (160) is disposed on the top cover (150) and extends through the insulating protective member (110) into the receiving cavity (111); One end of the tab (211) is connected to the battery cell (210), and the other end extends from the opening (1111) into the receiving cavity (111) to connect to the terminal post (160); The extension member (130) is disposed in the receiving cavity (111) and abuts between the electrode tab (211) and the electrode post (160).

2. The secondary battery according to claim 1, characterized in that, The extension component (130) includes: The base (131) abuts against the pole post (160); A stepped portion (132) is recessed in the base (131), and the stepped portion (132) is used to hold the tab (211).

3. The secondary battery according to claim 2, characterized in that, The base (131) and / or the step portion (132) are provided with a groove (134), and the groove (134) is filled with a conductor.

4. The secondary battery according to claim 3, characterized in that, The groove (134) is curved.

5. The secondary battery according to any one of claims 1 to 4, the secondary battery further includes an adapter piece (120) disposed in the receiving cavity (111), one end of the adapter piece (120) being connected to the terminal post (160) and the other end being connected to the tab (211), the same side of the extension member (130) abutting against the adapter piece (120) and the tab (211) connected to the adapter piece (120); the tab (211) connected to the adapter piece (120) is disposed between the adapter piece (120) and the extension member (130).

6. The secondary battery according to any one of claims 1 to 4, characterized in that, The insulating protective component (110) includes: An insulating sheet (112) is disposed on one side of the top cover (150), and the insulating sheet (112) is provided with a through hole (1121) for the pole post (160) to pass through; A protective sheet (113) is rotatably connected to the insulating sheet (112) at one end in a direction perpendicular to the first direction to form the receiving cavity (111).

7. The secondary battery according to claim 6, characterized in that, The protective sheet (113) is provided with a mating groove (114), and at least a portion of the extension member (130) is received in the mating groove (114).

8. The secondary battery according to claim 6, characterized in that, The protective sheet (113) has one of a buckle (115) and a slot (116) at its other end in a direction perpendicular to the first direction, and the insulating sheet (112) has the other of the buckle (115) and the slot (116), wherein the buckle (115) engages with the slot (116).

9. The secondary battery according to any one of claims 1 to 4, characterized in that, The secondary battery also includes: A thermal pad (140) is attached to the side of the insulating protective member (110) facing the battery cell (210), and the thermal pad (140) is used to attach to the top wall of the battery cell (210).

10. An electrical appliance, characterized in that, include: The secondary battery as described in any one of claims 1 to 9.

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