Plastic insulating plate and battery cell

Abstract

The utility model relates to the technical field of batteries, and discloses a plastic insulating plate and a battery cell. Wherein the plastic insulating plate comprises an insulating plate body, mounting grooves are suitable for assembling plastic parts, each mounting groove is internally provided with a mounting hole for allowing a pole to penetrate through, and two through holes are further formed in the insulating plate body and located between the two mounting grooves; according to the utility model, the through holes are formed in the insulating plate body, and the welding bottom plate and the tabs can be welded and connected through the through holes, so that the situation that the tabs are bent after being welded to occupy the space is avoided; the length of the tabs is shortened, the use space of the accommodating cavity in the shell in the length direction is improved, so that the utilization rate of the internal space of the battery cell is improved, and meanwhile, when the tabs are bent, the negative tab and the positive tab can be bent through the through holes, so that the tabs are convenient to bend, and the risk of breakage of the tabs is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a plastic insulating plate and an electric core. Background Art

[0002] With the increasing maturity of battery technology, batteries are widely used in electric vehicles and energy storage fields, and the requirements for the use performance and safety of batteries are increasing day by day. An electric core is the basic component unit of a battery and can independently generate and store electric energy.

[0003] In the prior art, during the production process of an electric core, it is usually necessary to bend the tab or connecting piece of the electric core. In this process, it is necessary to clamp and fix the electrode group to ensure that the tab or connecting piece can be accurately bent in place. However, when bending the tab or connecting piece, the tab may be torn, thus affecting the performance and safety of the electric core. Summary of the Utility Model

[0004] In view of this, the utility model provides a plastic insulating plate and an electric core to solve the problem that the tab may be torn when bending the tab or connecting piece.

[0005] In a first aspect, the utility model provides a plastic insulating plate, including:

[0006] An insulating plate body, with installation grooves respectively opened at both ends. Plastic parts are suitable for being assembled in the installation grooves. An installation hole for a pole column to pass through is opened in each installation groove. Two through holes are further opened on the insulating plate body between the two installation grooves. The two through holes are respectively arranged in one-to-one correspondence with the negative tab and the positive tab and are suitable for the negative tab and the positive tab to pass through.

[0007] Beneficial effects: Taking the electric core as an example, when installing the insulating plate body, the plastic parts are respectively assembled in the two installation grooves. The negative welding bottom plate and the positive welding bottom plate are fixed at the bottom of the cover plate by passing the pole column through the installation holes in the installation grooves, so that the insulating plate body is installed between the positive welding bottom plate, the negative welding bottom plate and the cover plate, and the insulation between the positive welding bottom plate, the negative welding bottom plate and the cover plate is ensured through the insulating plate body. Since two through holes corresponding to the negative tab and the positive tab are provided on the insulating plate body, the insulating plate body is covered on the electrode group, so that the negative tab and the positive tab on the electrode group pass through the corresponding through holes. By bending the negative tab and the positive tab, the negative welding bottom plate and the positive welding bottom plate are correspondingly abutted against the negative tab and the positive tab. At the same time, the installer can perform welding fixation on the negative welding bottom plate and the negative tab, and the positive welding bottom plate and the positive tab through the through holes.

[0008] By providing through holes on the insulating plate body, the welding bottom plate and the tab can be welded through the through holes, thereby avoiding the space occupied by the bent tab after welding, shortening the length of the tab, increasing the usable space of the accommodation cavity in the housing in the length direction, improving the internal space utilization rate of the battery cell. At the same time, when bending the tab, the negative tab and the positive tab can be bent through the through holes, facilitating the bending of the tab and avoiding the risk of tab breakage.

[0009] In an alternative embodiment, a limiting portion is provided on the inner wall of the through hole of the insulating plate body, the limiting portion protrudes from the upper surface of the insulating plate body, and the outer surface of the limiting portion is adapted to abut against the inner wall of the opening of the cover plate.

[0010] Beneficial effects: By providing a protruding limiting portion on the inner wall of the through hole, the close contact between the limiting portion and the opening of the cover plate can ensure good insulation performance between the insulating plate body and the cover plate, helping to prevent the risk of current leakage or short circuit and improving the safety of the battery cell.

[0011] The outer surface of the limiting portion abuts against the inner wall of the opening of the cover plate, which helps to accurately position the insulating plate body on the cover plate. Through the positioning function of the limiting portion, the assembly process can be simplified, assembly errors can be reduced, and assembly efficiency can be improved.

[0012] In an alternative embodiment, an arc chamfer is provided at the top of the limiting portion.

[0013] Beneficial effects: By providing an arc chamfer at the top of the limiting portion, the arc chamfer helps to guide the alignment of the insulating plate body and the opening of the cover plate during the assembly process, improving the assembly accuracy, and at the same time, it can reduce the assembly error caused by the misalignment between the limiting portion and the inner wall of the opening of the cover plate during the assembly process.

[0014] In an alternative embodiment, the through hole is a rectangular hole, and the length direction of the through hole is perpendicular to the length direction of the insulating plate body.

[0015] Beneficial effects: The long side direction of the through hole is consistent with the width direction of the insulating plate body, and the short side direction of the through hole is consistent with the length direction of the insulating plate body, which helps to improve the structural stability of the insulating plate body.

[0016] In an alternative embodiment, the width of the through hole is a, and the length of the insulating plate body is A, where 0.1 ≤ a / A ≤ 0.3.

[0017] Beneficial effects: By controlling the ratio of the width of the through hole to the length of the insulating plate body, the position accuracy of the tab passing through the through hole can be ensured, and at the same time, the width of the through hole is limited to ensure a good layout of the through hole on the insulating plate body and guarantee the structural strength of the insulating plate body.

[0018] In an alternative embodiment, the length of the through hole is b, the width of the insulating plate body is B, and 1 / 3 ≤ b / B ≤ 2 / 3.

[0019] Beneficial effects: By controlling the ratio of the length of the through hole to the width of the insulating plate body, the position accuracy when the tab passes through the through hole can be ensured, the structural stability of the insulating plate body can be improved, and loosening or deformation caused by vibration or external force during use can be reduced.

[0020] In an alternative embodiment, an explosion-proof valve vent hole is further provided on the insulating plate body, and the explosion-proof valve vent hole is located between the two through holes.

[0021] Beneficial effects: By providing an explosion-proof valve vent hole on the insulating plate body and connecting the explosion-proof valve vent hole to the explosion-proof valve, the pressure can be released in time when the internal pressure of the battery cell is too high, preventing the battery cell from exploding or being damaged, effectively controlling the internal pressure of the battery cell, and improving the safety of the battery cell.

[0022] Setting the explosion-proof valve vent hole between the two through holes helps to optimize the spatial layout of the insulating plate body.

[0023] In an alternative embodiment, the distance between the mounting groove and the edge of the insulating plate body is L1, the distance between the mounting groove and the adjacent through hole is L2, and the distance between the through hole and the explosion-proof valve vent hole is L3, 2.5 mm ≤ L1 ≤ 25 mm, 2 mm ≤ L2 ≤ 20 mm, 0.5 mm ≤ L3 ≤ 15 mm.

[0024] Beneficial effects: By controlling the distance L1 between the mounting groove and the edge of the insulating plate body, the structural stability of the entire insulating plate body can be improved, and loosening or deformation caused by vibration or external force during use can be reduced.

[0025] By controlling the distance L2 between the mounting groove and the adjacent through hole, it helps to optimize the layout of the tabs, reduce the space required for tab bending, and improve the use space of the accommodation cavity in the housing in the length direction.

[0026] By controlling the distance L3 between the through hole and the explosion-proof valve vent hole, the structural stability of the entire insulating plate body can be improved.

[0027] In an alternative embodiment, the two mounting grooves and the two through holes are symmetrically arranged about the axis of the insulating plate body.

[0028] Beneficial effects: By symmetrically arranging the two mounting grooves and the two through holes with respect to the axis of the insulating plate body, it helps to evenly distribute the load and stress, reduce local stress concentration, and thus improve the structural stability of the insulating plate body. Through the symmetrical arrangement, it can ensure that the tab accurately passes through the through hole, simplifying the assembly process.

[0029] In a second aspect, the present utility model also provides an electric core, comprising:

[0030] A housing;

[0031] A plastic insulating plate, and the insulating plate body is arranged in the housing.

[0032] Beneficial effects: This electric core includes the plastic insulating plate as described above, so it has all the beneficial technical effects of this plastic insulating plate, which will not be elaborated here. Description of the Drawings

[0033] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of a plastic insulating plate installed in an electric core according to an embodiment of the present utility model;

[0035] Figure 2 It is a schematic structural diagram of a plastic insulating plate according to an embodiment of the present utility model;

[0036] Figure 3 It is a top view of a plastic insulating plate according to an embodiment of the present utility model;

[0037] Figure 4 It is a side view of a plastic insulating plate according to an embodiment of the present utility model.

[0038] Explanation of the reference numerals in the drawings:

[0039] 1. Insulating plate body; 101. Mounting groove; 1011. Mounting hole; 102. Through hole; 103. Limiting part; 1031. Arc chamfer; 104. Explosion-proof valve vent hole; 1041. Reinforcing rib; 2. Plastic part; 3. Pole column; 4. Cover plate; 401. Opening; 5. Housing. Specific embodiments

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0041] In the related art, during the production process of an electric core, it is usually necessary to bend the tab or connecting piece of the electric core. During this process, it is necessary to clamp and fix the electrode group to ensure that the tab or connecting piece can be accurately bent in place. However, when bending the tab or connecting piece, the tab may be torn, thus affecting the performance and safety of the electric core.

[0042] To solve the above technical problems, the embodiments of the present utility model will be described below in conjunction with Figures 1 to 4 , describing the embodiments of the present utility model.

[0043] According to the embodiments of the present utility model, on the one hand, as Figures 1 to 4 shown, a plastic insulating plate is provided, including an insulating plate body 1.

[0044] Specifically, as Figure 2 shown, two mounting grooves 101 and two through holes 102 are formed on the insulating plate body 1.

[0045] Specifically, as Figure 2 shown, the two mounting grooves 101 are respectively located at both ends of the insulating plate body 1. The mounting grooves 101 are suitable for assembling plastic parts 2, and mounting holes 1011 for the electrode posts 3 to pass through are formed in each mounting groove 101.

[0046] Specifically, as Figure 2 shown, the two through holes 102 are located between the two mounting grooves 101. The two through holes 102 are respectively arranged in one-to-one correspondence with the negative tab (not shown in the figure) and the positive tab (not shown in the figure), and the two through holes 102 are suitable for the negative tab and the positive tab to pass through.

[0047] For this plastic insulating board, taking the battery cell as an example, when installing the insulating board body 1, the plastic parts 2 are respectively assembled in the two installation grooves 101. The negative electrode welding bottom plate and the positive electrode welding bottom plate are fixed to the bottom of the cover plate 4 by passing the pole column 3 through the installation holes 1011 in the installation grooves 101, so that the insulating board body 1 is installed between the positive electrode welding bottom plate, the negative electrode welding bottom plate and the cover plate 4, and the insulation between the positive electrode welding bottom plate, the negative electrode welding bottom plate and the cover plate 4 is ensured through the insulating board body 1. Since there are two through holes 102 corresponding to the negative electrode tab and the positive electrode tab on the insulating board body 1, the insulating board body 1 is covered on the electrode group, so that the negative electrode tab and the positive electrode tab on the electrode group pass through the corresponding through holes 102. By bending the negative electrode tab and the positive electrode tab, the negative electrode welding bottom plate and the positive electrode welding bottom plate are correspondingly abutted against the negative electrode tab and the positive electrode tab. At the same time, the installer can weld and fix the negative electrode welding bottom plate and the negative electrode tab, and the positive electrode welding bottom plate and the positive electrode tab through the through holes 102.

[0048] By opening the through holes 102 on the insulating board body 1, the welding bottom plate and the tab can be welded and connected through the through holes 102, thereby avoiding the space occupied by the tab after welding and bending, shortening the length of the tab, improving the use space of the accommodation cavity in the housing 5 in the length direction, and thus improving the utilization rate of the internal space of the battery cell. At the same time, when bending the tab, the negative electrode tab and the positive electrode tab can be bent through the through holes 102, which is convenient for bending the tab and avoiding the risk of tab fracture.

[0049] Specifically, the shape of the insulating board body 1 can be set to be rectangular. The insulating board body 1 can be set into different shapes according to actual application requirements to adapt to different battery cell design and assembly requirements. In the embodiments of the present application, the shape of the insulating board body 1 is not specifically limited.

[0050] Specifically, the shape of the installation groove 101 can be set to any existing shape such as rectangular, square, rounded rectangle, etc. The installation groove 101 can be adaptively set according to the shape of the plastic part 2. In the embodiments of the present application, the shape of the installation groove 101 is not specifically limited.

[0051] Specifically, the installation hole 1011 can be set to be a circular hole. The shape of the installation hole 1011 is adapted to the shape of the pole column 3 to ensure that the pole column 3 can pass through the installation hole 1011. In the embodiments of the present application, the shape of the installation hole 1011 is not specifically limited.

[0052] Specifically, the through hole 102 can be any existing shape such as a square hole, a long strip hole, etc. The area of the through hole 102 should be larger than the area of the corresponding tab to ensure that the tab can pass through the through hole 102 and the tab can be bent through the through hole 102. In the embodiments of the present application, the shape of the through hole 102 is not specifically limited.

[0053] In one embodiment, as Figure 2 shown, a limiting portion 103 is provided on the insulating plate body 1, and the limiting portion 103 is disposed around the inside of the through hole 102. Among them, the limiting portion 103 protrudes from the upper surface of the insulating plate body 1, and the outer surface of the limiting portion 103 is adapted to abut against the inner wall of the opening 401 of the cover plate 4.

[0054] By providing the protruding limiting portion 103 on the inner wall of the through hole 102, the close contact between the limiting portion 103 and the opening 401 of the cover plate 4 can ensure good insulation performance between the insulating plate body 1 and the cover plate 4, which helps to prevent the risk of current leakage or short circuit and improve the safety of the battery cell.

[0055] The outer surface of the limiting portion 103 abuts against the inner wall of the opening 401 of the cover plate 4, which helps to accurately position the insulating plate body 1 on the cover plate 4. Through the positioning function of the limiting portion 103, the assembly process can be simplified, the assembly error can be reduced, and the assembly efficiency can be improved.

[0056] Specifically, the limiting portion 103 is an annular structure formed around the inner wall of the through hole 102, and the limiting portion 103 is integrally formed with the insulating plate body 1. In the embodiments of the present application, the connection manner between the limiting portion 103 and the insulating plate body 1 is not specifically limited.

[0057] In one embodiment, as Figure 2 shown, an arc chamfer 1031 is provided at the top of the limiting portion 103.

[0058] By providing the arc chamfer 1031 at the top of the limiting portion 103, the arc chamfer 1031 helps to guide the alignment of the insulating plate body 1 and the opening 401 of the cover plate 4 during the assembly process, improve the assembly accuracy, and at the same time can reduce the assembly error caused by the misalignment between the limiting portion 103 and the inner wall of the opening 401 of the cover plate 4.

[0059] Specifically, the arc chamfer 1031 can be a circular arc chamfer or an elliptical arc chamfer. In the embodiments of the present application, the type of the arc chamfer 1031 is not specifically limited.

[0060] In one embodiment, as Figure 2 shown, the through hole 102 is a rectangular hole, and the length direction of the through hole 102 is perpendicular to the length direction of the insulating plate body 1.

[0061] The long side direction of the through hole 102 is consistent with the width direction of the insulating plate body 1, and the short side direction of the through hole 102 is consistent with the length direction of the insulating plate body 1, which helps to improve the structural stability of the insulating plate body 1.

[0062] In one embodiment, as Figure 3As shown, the width of the through hole 102 is a, the length of the insulating plate body 1 is A, and 0.1 ≤ a / A ≤ 0.3.

[0063] By controlling the ratio of the width of the through hole 102 to the length of the insulating plate body 1, the position accuracy when the tab passes through the through hole 102 can be ensured. At the same time, the width of the through hole 102 is limited to ensure a good layout of the through hole 102 on the insulating plate body 1 and guarantee the structural strength of the insulating plate body 1.

[0064] In one embodiment, as Figure 3 shown, the length of the through hole 102 is b, the width of the insulating plate body 1 is B, and 1 / 3 ≤ b / B ≤ 2 / 3.

[0065] By controlling the ratio of the length of the through hole 102 to the width of the insulating plate body 1, the position accuracy when the tab passes through the through hole 102 can be ensured, the structural stability of the insulating plate body 1 can be improved, and loosening or deformation caused by vibration or external force during use can be reduced.

[0066] In one embodiment, as Figure 2 and Figure 3 shown, an explosion-proof valve vent hole 104 is also provided on the insulating plate body 1, and the explosion-proof valve vent hole 104 is located between two through holes 102.

[0067] By providing the explosion-proof valve vent hole 104 on the insulating plate body 1 and connecting the explosion-proof valve vent hole 104 to the explosion-proof valve, the pressure can be released in time when the internal pressure of the battery cell is too high, preventing the battery cell from exploding or being damaged, effectively controlling the internal pressure of the battery cell, and improving the safety of the battery cell.

[0068] Setting the explosion-proof valve vent hole 104 between two through holes 102 helps to optimize the spatial layout of the insulating plate body 1.

[0069] Specifically, a plurality of vent holes are provided in the explosion-proof valve vent hole 104. The vent holes can be circular or strip-shaped holes. The plurality of vent holes can be evenly spaced or unevenly spaced. In the embodiments of the present application, the structure of the explosion-proof valve vent hole 104 is not specifically limited.

[0070] Specifically, as Figure 4 shown, the explosion-proof valve vent hole 104 can be recessed downward toward the bottom of the insulating plate body 1, so that there is enough space left on the explosion-proof valve vent hole 104 to install the explosion-proof valve.

[0071] Specifically, as Figure 2 shown, a plurality of reinforcing ribs 1041 can be provided on both sides of the explosion-proof valve vent hole 104 to strengthen the structural strength of the insulating plate body 1.

[0072] In one embodiment, as Figure 3As shown, the distance between the installation groove 101 and the edge of the insulating plate body 1 is L1, the distance between the installation groove 101 and the adjacent through hole 102 is L2, and the distance between the through hole 102 and the explosion-proof valve vent hole 104 is L3. 2.5 mm ≤ L1 ≤ 25 mm, 2 mm ≤ L2 ≤ 20 mm, 0.5 mm ≤ L3 ≤ 15 mm.

[0073] By controlling the distance L1 between the installation groove 101 and the edge of the insulating plate body 1, the structural stability of the entire insulating plate body 1 can be improved, and loosening or deformation caused by vibration or external forces during use can be reduced.

[0074] By controlling the distance L2 between the installation groove 101 and the adjacent through hole 102, it helps to optimize the arrangement of the tab, reduce the space required for tab bending, and improve the usable space of the accommodation cavity in the housing 5 in the length direction.

[0075] By controlling the distance L3 between the through hole 102 and the explosion-proof valve vent hole 104, the structural stability of the entire insulating plate body 1 can be improved.

[0076] In one embodiment, as Figures 2 to 4 shown, the two installation grooves 101 and the two through holes 102 are symmetrically arranged about the axis of the insulating plate body 1.

[0077] By symmetrically arranging the two installation grooves 101 and the two through holes 102 about the axis of the insulating plate body 1, it helps to evenly distribute the load and stress, reduce local stress concentration, and thus improve the structural stability of the insulating plate body 1. Through the symmetrical arrangement, it can ensure that the tab accurately passes through the through hole 102 and simplify the assembly process.

[0078] According to an embodiment of the present invention, on the other hand, as Figures 1 to 4 shown, a battery cell is further provided, including a housing 5 and a plastic insulating plate.

[0079] Specifically, the insulating plate body 1 is disposed inside the housing 5.

[0080] This battery cell includes the plastic insulating plate as described above, so it has all the beneficial technical effects of the plastic insulating plate, which will not be elaborated here.

[0081] The installation process of the battery cell in this embodiment is described as follows:

[0082] First, the end plate is disposed on the electrode assembly and the negative tab and the positive tab are passed through the through holes of the end plate, and then the insulating film is sleeved on the electrode assembly.

[0083] Fix the insulating plate body 1 to the bottom of the cover plate 4 through the pole column 3 and the plastic part 2. Subsequently, insert the electrode group into the accommodation cavity of the housing 5 from the bottom of the housing 5, so that the negative electrode tab and the positive electrode tab on the electrode group pass through the through hole 102 of the insulating plate body 1 and the opening 401 on the cover plate 4.

[0084] Then, the installer bends the negative electrode tab and the positive electrode tab into an "L" shape through the opening 401 and the through hole 102, and then welds the negative electrode tab to the negative welding bottom plate and the positive electrode tab to the positive welding bottom plate.

[0085] After the welding bottom plate is welded to the electrode tab, the electrolyte can be injected into the battery cell through the through hole 102. When the injection is completed, seal the opening 401 on the cover plate 4 with the sealing plate to complete the assembly of the battery cell.

[0086] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A plastic insulating board, characterized in that: include: The insulating plate body has mounting grooves at both ends, each of which is suitable for assembling plastic parts. Each of the mounting grooves is provided with a mounting hole for the pole to pass through. Two through holes are also provided on the insulating plate body between the two mounting grooves. The two through holes are respectively arranged in one-to-one correspondence with the negative electrode tab and the positive electrode tab and are suitable for the negative electrode tab and the positive electrode tab to pass through.

2. The plastic insulating board according to claim 1, characterized in that: The insulating plate body is provided with a limiting portion arranged around the inner wall of the through hole, the limiting portion protrudes from the upper surface of the insulating plate body, and the outer surface of the limiting portion is suitable for abutting against the inner wall of the cover plate opening.

3. The plastic insulating board according to claim 2, characterized in that: The top of the limiting portion is provided with an arc chamfer.

4. The plastic insulating board according to claim 1, characterized in that: The through hole is a rectangular hole, and the length direction of the through hole is perpendicular to the length direction of the insulation board body.

5. The plastic insulating board according to claim 4, characterized in that: The width of the through hole is a, the length of the insulating plate body is A, and 0.1≤a / A≤0.

3.

6. The plastic insulating board according to claim 4, characterized in that: The length of the through hole is b, the width of the insulating plate body is B, and 1 / 3≤b / B≤2 / 3.

7. The plastic insulating board according to claim 1, characterized in that: The insulating plate body is also provided with an explosion-proof valve vent hole, and the explosion-proof valve vent hole is located between the two through holes.

8. The plastic insulating board according to claim 7, characterized in that: The distance between the mounting groove and the edge of the insulating plate body is L1, the distance between the mounting groove and the adjacent through hole is L2, and the distance between the through hole and the explosion-proof valve vent is L3, 2.5mm≤L1≤25mm, 2mm≤L2≤20mm, 0.5mm≤L3≤15mm.

9. The plastic insulating board according to any one of claims 1 to 8, characterized in that: The two mounting grooves and the two through holes are symmetrically arranged about the axis of the insulation board body.

10. A battery cell, characterized in that: include: case; The plastic insulating plate according to any one of claims 1 to 9, wherein the insulating plate body is disposed inside the shell.

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