Battery cover plate assembly and square battery

Abstract

The utility model relates to battery technical field discloses a battery cover plate subassembly and square battery, the battery cover plate subassembly includes cover plate body, insulating part and pole lug baffle, is provided with the pole column on the cover plate body, the insulating part sets up in the bottom of cover plate body, and the pole column passes insulating part, the pole lug baffle rotatably connects in insulating part, and one end of pole lug baffle is provided with the clamping part, and the clamping part can be connected with the clamping groove of insulating part, so that the pole lug baffle is limited with the deformation of the pole lug connected with the pole column under the buckling state. The utility model discloses a battery cover plate subassembly through the cooperation of cover plate body, insulating part and pole lug baffle, and the reliable mechanical barrier of opening and closing is innovatively arranged above the pole lug connecting area. The safety hidden danger that the short circuit is caused by the inward folding of the pole lug due to the bending assembly or the shaking of the battery cell is solved, the blue glue scheme with limited effect and easy to fall off is replaced, and the safety and reliability of the square battery are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cover assembly and a square battery. Background Technology

[0002] Square batteries, a widely used battery type, typically require their core's positive and negative tabs to be soldered separately onto an adapter plate, which is then soldered to the positive and negative terminals to achieve overcurrent protection. After soldering, the tabs need to be bent for assembly. However, during this process, if the tabs undergo abnormal deformation, they can easily insert into the core, resulting in tab insertion and potentially causing a short circuit, posing a significant safety hazard.

[0003] Currently, the industry commonly uses a method of applying blue adhesive after the tab soldering to attempt to alleviate the above problems. However, this method can only prevent the tabs from being inserted backwards with a low probability, and its protective effect is limited and unreliable. More seriously, during battery use, the winding core inside the cell inevitably shakes. This shaking continuously pulls on the connection between the tabs and the soldering, which can easily lead to breakage over time. In addition, there is a risk that the blue adhesive may fall off. Once it falls off, it not only loses its protective function but may also become a foreign object, increasing the possibility of the tabs inside the battery being folded and inserted backwards, further threatening the battery's safety performance. Utility Model Content

[0004] In view of this, the present invention proposes a battery cover assembly and a square battery to solve the problem that the tabs in square batteries are prone to folding and being inserted upside down.

[0005] The technical solution of this utility model is implemented as follows: In a first aspect, this utility model provides a battery cover assembly, comprising: A cover plate body, on which an pole post is provided; An insulating element is disposed at the bottom of the cover plate body, and the pole passes through the insulating element; A tab baffle is rotatably connected to the side of the insulating member away from the cover plate body. One end of the tab baffle is provided with a snap-fit ​​part. A corresponding slot is provided on the insulating member. The snap-fit ​​part can engage with the slot so that the tab baffle restricts the deformation of the tab connected to the pole post when it is engaged.

[0006] Based on the above technical solution, preferably, when the electrode tab baffle is in the snap-fit ​​state, its position covers the connection area between the electrode post and the electrode tab.

[0007] Based on the above technical solution, preferably, the number of the electrode baffles is two, and they are symmetrically arranged on both sides of the insulating member.

[0008] Based on the above technical solution, preferably, the tab baffle has a first end and a second end opposite to each other; the first end is rotatably connected to the insulating member, and the second end is provided with the snap-fit ​​part.

[0009] Based on the above technical solution, preferably, the slot is disposed at the end of the insulating component along its length; or the slot is disposed at the middle of the insulating component along its length.

[0010] Based on the above technical solution, preferably, it also includes a connecting piece, which is fixedly connected to the pole post. When the pole tab baffle is engaged with the slot, its position corresponds to and can cover the connection area between the connecting piece and the pole tab.

[0011] Based on the above technical solution, preferably, an explosion-proof valve is provided in the middle of the cover plate body, and two electrode baffles are symmetrically located on both sides of the explosion-proof valve.

[0012] Based on the above technical solution, preferably, the cover plate body is provided with a liquid injection hole, and the electrode tab baffle corresponding to the position of the liquid injection hole is provided with a plurality of liquid permeation holes.

[0013] Secondly, this utility model discloses a square battery, including a housing, a winding core, and the battery cover assembly described in the first aspect. The winding core is disposed inside the housing, and the tabs of the winding core are electrically connected to the terminals. The cover body is fixedly connected to the opening end of the housing.

[0014] Based on the above technical solution, preferably, it also includes an adhesive tape, one end of which is adhered to the core and the other end of which covers the connection area between the tab and the post.

[0015] The present invention has the following advantages over the prior art: (1) The battery cover assembly of this utility model innovatively sets up a reliable mechanical barrier that can be opened and closed above the electrode connection area through the coordinated cooperation of the cover body, insulating parts and electrode tab baffle with snap-fit ​​structure. This solution fundamentally solves the safety hazard of short circuit caused by electrode tabs folding inward due to bending assembly or cell shaking, and replaces the blue glue solution which has limited effect and is easy to fall off, significantly improving the safety and reliability of square batteries.

[0016] (2) By setting up the tab baffle and the tape, a dual protection mechanism for the tab is formed. The tab baffle provides rigid mechanical obstruction from above, mainly preventing the tab from folding upwards or inwards significantly; while the tape provides flexible constraint, fixation and cushioning from below, mainly suppressing the tab's own shaking, protecting the integrity of the solder mark and reinforcing the base of the tab. The two, one above and one below, one rigid and one flexible, work together to greatly improve the stability and reliability of the tab under dynamic working conditions from different levels. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a first-view perspective three-dimensional structural diagram of the battery cover assembly disclosed in an embodiment of the present utility model; Figure 2 This is a second-view perspective three-dimensional structural diagram of the battery cover assembly disclosed in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the battery cover assembly and the core assembly structure disclosed in an embodiment of the present utility model; Figure 4 This is a schematic diagram of the battery cover assembly, core, and tape assembly structure disclosed in an embodiment of the present utility model; Figure 5 This is a schematic diagram of the planar structure of the square battery disclosed in an embodiment of the present utility model; Figure 6 for Figure 5 Planar sectional view at point AA; Figure label: 1. Cover plate body; 2. Insulating component; 3. Electrode tab baffle; 31. Snap-fit ​​part; 21. Snap-fit ​​groove; 11. Electrode post; 4. Connecting piece; 12. Explosion-proof valve; 13. Liquid injection hole; 32. Liquid permeation hole; 5. Housing; 6. Core; 61. Electrode tab; 7. Adhesive tape. Detailed Implementation

[0019] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0024] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0025] The following disclosure provides numerous different embodiments or examples for implementing various structures of the present invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of the invention. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0026] like Figure 1 As shown, combined with Figure 2-3 This utility model discloses a battery cover assembly. The battery cover assembly includes a cover body 1, an insulating component 2, and a tab baffle 3. The cover body 1, serving as a sealing structure for the battery, is made of stamped metal sheet, such as aluminum, and is used to seal the opening of the battery casing 5. A terminal post 11 is provided on the cover body 1, serving as a current conduction channel. The terminal post 11 is fixedly installed on the cover body 1 and electrically isolated from the cover body 1 by an insulating material.

[0027] An insulating component 2 is located at the bottom of the cover plate body 1 and is made of insulating materials such as engineering plastics. The insulating component 2 is fixed to the cover plate body 1 by means of snap-fit ​​or adhesive, serving both support and insulation functions. The terminal post 11 passes through a pre-set through hole on the insulating component 2, thereby achieving reliable insulation isolation from the cover plate body 1 and preventing short circuits. The insulating component 2 ensures electrical isolation between the charged components inside the battery and the metal cover plate.

[0028] The tab baffle 3 is rotatably connected to the insulating member 2 via a pivot or hinge structure. The tab baffle 3 can be made of plastic or non-conductive material, and one end of it is provided with a snap-fit ​​part 31, which can be a protrusion, hook, or other structure. A slot 21 is provided on the insulating member 2 at a position corresponding to the snap-fit ​​part 31. After the tab 61 is connected to the pole post 11, the tab baffle 3 is flipped toward the pole post 11, so that its snap-fit ​​part 31 engages with the slot 21 on the insulating member 2, thereby making the tab baffle 3 stably locked in the locked state.

[0029] In the engaged state, the tab baffle 3 is located above the connection area between the terminal post 11 and the tab 61, forming a physical barrier. When the winding core 6 inside the battery shakes due to vibration or impact, the tab 61 will be pulled or squeezed. The tab baffle 3 can prevent the tab 61 from abnormally folding or deforming inward towards the winding core 6, effectively preventing the tab 61 from being inserted inward. This mechanical blocking method is more reliable and durable than the traditional blue adhesive fixing.

[0030] This utility model's battery cover assembly innovatively creates a reliable, closable mechanical barrier above the connection area of ​​the tab 61 through the coordinated operation of the cover body 1, the insulating component 2, and the tab baffle 3 with a snap-fit ​​structure. This solution fundamentally solves the safety hazard of short circuits caused by the tab 61 folding inward due to bending during assembly or cell movement, replacing the limited and easily detachable blue adhesive solution, and significantly improving the safety and reliability of square batteries.

[0031] In some embodiments, when the tab baffle 3 is engaged, its position covers the connection area between the pole post 11 and the tab 61.

[0032] Therefore, the primary function of the tab baffle 3 covering the connection area is to provide direct mechanical protection. When the internal winding core 6 of the battery shakes due to charge / discharge cycles or external vibrations, the tab 61 may be subjected to irregular forces and tilt upwards or fold inwards towards the winding core 6. At this time, the tab baffle 3 above it can block the abnormal displacement path of the tab 61, and in particular, effectively prevent the tab 61 from inserting into the winding core 6 (i.e., tab insertion), thereby avoiding the risk of short circuit caused by the tab 61 contacting other components of the winding core 6. In addition, this coverage can also reduce fatigue of the welding point caused by long-term force and shaking to a certain extent, and improve the reliability of the connection.

[0033] In some embodiments, the number of the tab baffles 3 is two, and they are symmetrically arranged on both sides of the insulating member 2.

[0034] Specifically, the two tab baffles 3 are arranged on the left and right sides or opposite sides of the insulating member 2, with the central axis of the insulating member 2 or a specific reference plane as the axis of symmetry. This symmetrical layout means that the mounting points, rotation trajectories, and final positions of the two tab baffles 3 on the insulating member 2 are mirror images of each other. The symmetrical arrangement ensures that the connection areas of the tabs 61 on both sides inside the battery can receive equal protection. Each tab baffle 3 operates independently, engaging with the corresponding slot 21 on the insulating member 2 through its own snap-fit ​​part 31, thereby achieving independent fastening.

[0035] The two symmetrical tab baffles 3 firstly achieve complete coverage of the protection range. For a square battery with two positive and negative terminals 11, this design can simultaneously protect the connection area between the two terminals 11 and the corresponding tabs 61, avoiding the problem of insufficient protection on one side. The symmetrical layout helps maintain the overall mechanical balance of the battery cover assembly. When the battery is subjected to vibration or impact, the symmetrical support and constraint on both sides can prevent additional stress from being generated in the cover or insulation component 2 due to uneven force, thus improving the stability of the structure.

[0036] In some embodiments, the tab baffle 3 has a first end and a second end, which are located at opposite ends in the length direction of the tab baffle 3.

[0037] The first end serves as the rotation center of the tab baffle 3, and is rotatably connected to the insulating component 2 via connecting components such as a pivot, hinge, or pin. This connection method allows the tab baffle 3 to rotate around a fixed axis, so that it can be flipped downwards to the latching position when it needs to cover the connection area of ​​the tab 61, and flipped upwards to the open position when it needs to be maintained or inspected.

[0038] The second end, serving as the free end of the tab baffle 3, is provided with a locking part 31. This locking part 31 can be a specific shape such as a protrusion, a hook-like structure, or a beveled tongue, designed to form a separable mechanical locking relationship with the corresponding slot 21 on the insulating member 2. When the tab baffle 3 flips from the open state to the closed state, the locking part 31 at the second end will eventually embed or lock into the slot 21 along the movement trajectory of the tab baffle 3.

[0039] In some embodiments, the slot 21 is provided at the end of the insulating member 2 along its length. Here, "end" refers to the position of the insulating member 2 near its edge or corner along its length. Providing the slot 21 here means that the first end of the tab baffle 3 is rotatably connected to the middle of the insulating member 2, and when the tab baffle 3 is fastened, the engaging portion 31 at its second end engages with the slot 21 at the edge region of the end of the insulating member 2.

[0040] In some embodiments, the slot 21 is located at the middle of the length of the insulating member 2. Here, "middle" does not refer to a strict geometric center point, but rather to the intermediate section between the two ends along the length. Thus, the first end of the tab baffle 3 naturally rotates and connects with the end region of the insulating member 2 along its length. When the tab baffle 3 needs to be engaged, it flips towards the middle of the insulating member 2 to engage with the slot 21 in the middle of the insulating member 2.

[0041] It should be noted that when assembling the square battery, the core 6 needs to be laid flat on both sides of the battery cover assembly. When welding the tab 61 and the terminal post 11, it is necessary to ensure that the tab baffle 3 is in the open state. The solution of rotating the tab baffle 3 to the end of the insulating component 2 is the optimal solution. This is because when the tab baffle 3 is open, the tab baffle 3 can be flipped to the outside of the insulating component 2 along the length direction of the insulating component 2, thus providing space for the welding operation of the tab 61 and the terminal post 11.

[0042] Of course, in the scheme of rotating connection between the electrode baffle 3 and the insulating part 2, when welding the electrode 61, since the two electrode baffles 3 are close to each other, the two electrode baffles 3 can be flipped face to face and erected by tooling, and the position of the two electrode baffles 3 can be constrained.

[0043] In some embodiments, a connecting piece 4 is also included, which is fixedly connected to the pole post 11. When the pole tab baffle 3 is engaged with the locking part 31 and the locking groove 21, its position corresponds to and can cover the connection area between the connecting piece 4 and the pole tab 61.

[0044] The connecting piece 4 is typically made of a highly conductive metal, such as nickel or aluminum. The lower surface of the connecting piece 4 is securely electrically and mechanically connected to the tab 61 extending from the battery core 6 via laser welding or ultrasonic welding. The upper surface of the connecting piece 4 is then fixedly connected to the end of the terminal post 11 passing through the cover plate body 1. In this way, the connecting piece 4 establishes a stable and reliable current-carrying channel between the tab 61 and the terminal post 11, fulfilling the crucial function of transmitting current.

[0045] During the assembly and operation of the battery cover assembly, the welding area between the connecting piece 4 and the tab 61 is a critical mechanical stress point and a potential point of failure. When the tab baffle 3 is engaged with the latching part 31 and the latching groove 21, its position is precisely set to correspond to and cover the connection area between the connecting piece 4 and the tab 61. This means that when the tab baffle 3 is engaged, its plate body is positioned directly above the welding point between the connecting piece 4 and the tab 61, acting like a protective shield.

[0046] The introduction of the connecting piece 4 enhances the structural strength of the connection between the tab 61 and the terminal post 11, but the connection point between the connecting piece 4 and the tab 61 itself is still an area that requires special protection. The tab baffle 3 covers this connection area, providing direct mechanical protection. When the internal core 6 of the battery shakes due to vibration, the tab baffle 3 can effectively prevent the welding point of the connecting piece 4 and the tab 61 from warping or deforming unnecessarily upwards or inwards towards the core 6, preventing the risk of breakage due to excessive stress on the welding point, and also eliminating the possibility of an internal short circuit from the tab 61 at this point.

[0047] In some embodiments, an explosion-proof valve 12 is provided in the middle of the cover body 1, and two electrode baffles 3 are symmetrically located on both sides of the explosion-proof valve 12.

[0048] The explosion-proof valve 12 is positioned in the middle of the cover plate body 1, serving as the central reference point for the symmetrical arrangement of the two tab baffles 3, thus achieving a synergistic integration of safety and protection functions. This arrangement ensures that the explosion-proof valve 12 has optimal pressure relief, as the central position typically responds most directly and quickly to overall pressure changes within the battery. Simultaneously, the tab baffles 3, symmetrically distributed on both sides, effectively cover and protect the connection area of ​​the tabs 61 on their respective sides, completely preventing any obstruction or interference from their structure or movement on the working area of ​​the explosion-proof valve 12, ensuring that the explosion-proof valve 12 can be activated without hindrance in emergency situations.

[0049] In some embodiments, the cover plate body 1 is provided with an injection hole 13, which penetrates the cover plate body 1, and the insulating member 2 is provided with a corresponding through hole for injecting electrolyte into the battery during the battery packaging process.

[0050] The tab baffle 3, corresponding to the position of the injection hole 13, is provided with multiple liquid permeation holes 32. When the tab baffle 3 is in the snap-fit ​​state, the area with the liquid permeation holes 32 is located directly below the injection hole 13 of the cover plate body 1. During the battery injection process, the injection needle can pass through the injection hole 13 on the cover plate body 1, and the electrolyte will pass through the injection hole 13 and the multiple liquid permeation holes 32 on the tab baffle 3 in turn, and finally flow smoothly into the core 6 area inside the battery. The tab baffle 3 itself acts as a physical barrier, and its plate body will inevitably block the space below. The liquid permeation holes 32 are designed to create a dedicated flow path for the electrolyte while maintaining the overall structural integrity and protective function of the tab baffle 3.

[0051] The second embodiment of this utility model also discloses a square battery, as shown in the attached drawing. Figure 5 and 6 As shown, the battery includes a housing 5, a core 6, and the battery cover assembly disclosed in the above embodiments. The core 6 is disposed inside the housing 5, and the tabs 61 of the core 6 are electrically connected to the terminals 11. The cover body 1 and the open end of the housing 5 are fixedly connected.

[0052] The core component 6 is the core of the battery, formed by winding or stacking positive and negative electrode sheets and a separator. It has a square outline and is housed within the internal cavity of the casing 5. Positive and negative tabs 61 extend upwards from the upper end of the core 6. These tabs 61 need to be electrically connected to the terminals 11 on the battery cover assembly to conduct the current generated by the core 6 to the external circuit. The connection between the tabs 61 and the terminals 11 is typically achieved through welding methods, such as laser welding or ultrasonic welding, to ensure reliable connection and low contact resistance.

[0053] After the core 6 is installed and the tab 61 is connected to the pole post 11, the cover plate assembly is placed over the opening end of the housing 5, and the outer periphery of the cover plate body 1 is fixedly connected to the edge of the opening end of the housing 5 by laser welding and other processes, thereby forming a completely sealed whole, effectively preventing electrolyte leakage and external contaminant intrusion.

[0054] The square battery of this utility model adopts the battery cover assembly disclosed in the aforementioned embodiments. Since the electrode baffle 3 structure is introduced into the battery cover assembly, the problem of short circuit in the electrode 61 that has long plagued square batteries is effectively solved.

[0055] In the above embodiments, the battery cover assembly can directly weld the tab 61 and the terminal post 11, or the tab 61 and the terminal post 11 can be welded through the connecting piece 4.

[0056] In some embodiments, refer to the appendix Figure 4 As shown, the square battery also includes an adhesive tape 7, one end of which is adhered to the core 6, and the other end covers the connection area between the tab 61 and the post 11.

[0057] One end of the tape 7 is firmly adhered to the top surface of the battery core 6. The top surface of the core 6 is the base plane from which the tab 61 emerges, providing a stable fixing point for attaching the tape 7. The other end of the tape 7 extends from the top surface of the core 6, traversing the main body of the tab 61, and finally covering and adhering to the connection area between the tab 61 and the terminal post 11. This connection area typically includes the welding points (i.e., solder marks) between the tab 61 and the connecting piece 4, as well as the welding points between the connecting piece 4 and the terminal post 11, and is a critical area for electrical connection and mechanical stress.

[0058] The tape 7 provides multifaceted protection for the tab 61 and its connection area. Firstly, the tape 7 effectively prevents solder joints from cracking or detaching due to vibration fatigue. During battery use, the continuous vibration of the internal core 6 generates cyclic stress on the solder joint between the tab 61 and the connecting piece 4. The tape 7, through its adhesive layer, tightly presses and fixes the solder joint area, significantly reducing the impact and amplitude on the solder joint, thus avoiding the risk of micro-cracks expanding or instantaneous breakage due to metal fatigue. Secondly, the tape 7 provides crucial reinforcement to the root of the tab 61. The root of the tab 61 is the area of ​​highest stress concentration and the weakest point most susceptible to cracking due to high-frequency vibration. By firmly adhering the root of the tab 61 and its surrounding area to the surface of the core 6, the tape 7 restricts the movement of the root, distributing the stress generated by vibration over a larger adhesive area, thereby effectively preventing vibration cracking at the root of the tab 61 due to stress concentration.

[0059] The tape 7 and the tab baffle 3 together constitute a dual protection mechanism for the tab 61. The tab baffle 3 provides a rigid mechanical barrier from above, mainly preventing the tab 61 from folding upwards or inwards significantly; while the tape 7 provides flexible restraint, fixation, and cushioning from below, mainly suppressing the shaking of the tab 61 itself, protecting the integrity of the solder joint, and reinforcing the base of the tab 61. The two work together, one above and one below, one rigid and one flexible, to greatly improve the stability and reliability of the tab 61 under dynamic operating conditions from different levels.

[0060] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cover assembly, characterized in that, include: Cover plate body (1), on which pole post (11) is provided; An insulating element (2) is disposed at the bottom of the cover plate body (1), and the pole post (11) passes through the insulating element (2); A tab baffle (3) is rotatably connected to the side of the insulating member (2) away from the cover plate body (1). One end of the tab baffle (3) is provided with a snap-fit ​​part (31). A corresponding slot (21) is provided on the insulating member (2). The snap-fit ​​part (31) can snap into the slot (21) so that the tab baffle (3) restricts the deformation of the tab (61) connected to the pole post (11) in the snap-fit ​​state.

2. The battery cover assembly as described in claim 1, characterized in that: When the tab baffle (3) is engaged, its position covers the connection area between the pole post (11) and the tab (61).

3. The battery cover assembly as described in claim 2, characterized in that: The number of the tab baffles (3) is two, and they are symmetrically arranged on both sides of the insulating member (2).

4. The battery cover assembly as described in claim 3, characterized in that: The tab baffle (3) has a first end and a second end opposite to each other; the first end is rotatably connected to the insulating member (2), and the second end is provided with the snap-fit ​​part (31).

5. The battery cover assembly as described in claim 4, characterized in that: The slot (21) is located at the end of the insulating member (2) along its length; or the slot (21) is located at the middle of the insulating member (2) along its length.

6. The battery cover assembly as described in claim 2, characterized in that: It also includes a connecting piece (4), which is fixedly connected to the pole post (11). When the pole tab baffle (3) is engaged with the snap-fit ​​part (31) and the slot (21), its position corresponds to and can cover the connection area between the connecting piece (4) and the pole tab (61).

7. The battery cover assembly as described in claim 3, characterized in that: An explosion-proof valve (12) is provided in the middle of the cover plate body (1), and two electrode baffles (3) are symmetrically located on both sides of the explosion-proof valve (12).

8. The battery cover assembly as described in claim 2, characterized in that: The cover plate body (1) is provided with a liquid injection hole (13), and the electrode tab baffle (3) corresponding to the position of the liquid injection hole (13) is provided with a plurality of liquid permeation holes (32).

9. A square battery, characterized in that, The battery includes a housing (5), a core (6), and a battery cover assembly as described in any one of claims 1 to 8. The core (6) is disposed inside the housing (5), and the tabs (61) of the core (6) are electrically connected to the terminals (11). The cover body (1) and the open end of the housing (5) are fixedly connected.

10. The square battery as described in claim 9, characterized in that: It also includes tape (7), one end of which is adhered to the core (6) and the other end covers the connection area between the tab (61) and the post (11).

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