battery

Abstract

The utility model discloses a battery, including pole, apron and insulating part, the pole is installed on the apron, the insulating part is located between the outer periphery of pole and apron, the upper end surface of pole is used for with bus bar welding, and is formed with the welding mark, and the area of welding mark is A, the unit is mm 2 , the minimum distance between welding mark and insulating part is D, the unit is mm, and the above parameter satisfies: the utility model can avoid insulating part melting or deforming when pole and bus bar weld, make pole and cover body contact, cause battery short circuit.

Description

Technical Field

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

[0002] In the field of battery manufacturing, terminals, as the connection terminals between the internal battery cells and the external circuitry, are typically mounted on the battery cover to facilitate the conduction and introduction of current. To prevent electrical short circuits between the terminals and the metal cover, existing technologies usually incorporate insulating components, such as insulating sleeves or insulating gaskets, between the terminals and the cover to isolate conductive parts.

[0003] During battery assembly, the terminals need to be reliably connected to the busbar, often achieved through welding. However, due to the high welding temperature, heat can be transferred along the terminals to the cover plate, affecting the insulation components between them. If the insulation melts or deforms, it not only reduces insulation performance but may also cause direct contact between the terminals and the cover plate, leading to insulation failure. Insulation failure can create a short circuit between the terminals and the cover plate, triggering an internal short circuit within the battery. In severe cases, this can result in decreased battery performance, overheating, or even a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a battery that prevents the insulating parts from melting or deforming due to heat during the welding of the terminals and busbars, which could cause the terminals to come into contact with the cover and result in a short circuit.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A battery includes terminals, a cover plate, and an insulating component. The terminals are mounted on the cover plate, and the insulating component is located between the outer periphery of the terminals and the cover plate. The upper end face of the terminals is used for welding to a busbar and has solder marks formed thereon.

[0007] The area of ​​the solder mark is A, in mm. 2 The minimum distance between the solder mark and the insulating component is D, in mm, and the above parameters satisfy:

[0008]

[0009] Compared with the prior art, the battery of this utility model embodiment has the following advantages:

[0010] In this invention, a large amount of heat is generated when the terminal post is welded to the busbar. The heat is transferred from the terminal post to the insulating component. Since the insulating component has a low melting point, it is easy to melt due to heat, resulting in insulation failure and increasing the risk of battery short circuit. The larger the area A of the solder mark formed by welding the terminal block and the busbar, the better the current carrying capacity. However, the more heat is generated during welding, the easier it is for the insulation to melt. Conversely, the smaller the area A of the solder mark, the worse the current carrying capacity, and the less likely the insulation will deform or melt. The larger the minimum distance D between the solder mark and the insulation, the farther the welding position is from the insulation, so the insulation is less likely to deform due to heat. However, the area of ​​the solder mark is relatively small, which affects the current carrying performance. Conversely, the smaller the minimum distance D between the solder mark and the insulation, the easier it is for the insulation to deform and melt due to heat, but the current carrying performance is good. Therefore, the current carrying capacity of the battery and whether the insulation will deform and melt are affected by the area A of the solder mark and the minimum distance D between the solder mark and the insulation.

[0011] Therefore, the A / D ratio can be used to ensure the battery's current carrying capacity while preventing the insulation from melting and deforming due to heat. While a high A / D ratio improves current carrying capacity, it also makes the insulation more susceptible to melting and deformation during welding, affecting insulation performance. Conversely, a low A / D ratio ensures the insulation is less prone to melting and deformation, but results in poor current carrying capacity. Therefore, it is necessary to maintain a suitable A / D ratio. This ensures the battery's overcurrent capacity and prevents the insulating components from easily melting or deforming due to heat. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of one of the cover plate, pole post and insulating components of this utility model;

[0013] Figure 2 This is another schematic diagram of the cover plate, pole post and insulating component of this utility model;

[0014] Figure 3 yes Figure 2 Enlarged view of point B in the image;

[0015] Figure 4 yes Figure 2 Sectional view of AA;

[0016] Figure 5 yes Figure 4 Enlarged view of point C in the image;

[0017] Figure 6 This is a schematic diagram showing the relationship between the pole and the insulating component in one embodiment of this utility model.

[0018] Figure 7This is a schematic diagram showing the relationship between the pole and the insulating component in another embodiment of this utility model;

[0019] Figure 8 This is a schematic diagram of the overall structure of this utility model.

[0020] In the diagram, 1 is the pole; 11 is the solder mark; 111 is the inner fillet; 12 is the positioning hole; 13 is the step; 2 is the cover plate; 3 is the insulating component; 4 is the housing; 5 is the battery cell; and 6 is the sealing ring. Detailed Implementation

[0021] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0022] In the description of this utility model, it should be understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, parts, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts, components, and / or groups thereof. It should be understood that when we say a part is "connected" to another part, it can be directly connected to the other part, or there may be intermediate parts. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0023] The single battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this embodiment is not limited to this. A single battery cell typically includes a battery casing, a cell, an adapter plate, and an electrolyte. The battery casing is used to house the cell and electrolyte, and generally includes a casing body and a cover plate. At least one positive electrode post and at least one negative electrode post are disposed on the casing and / or the cover plate. The cell includes one or more electrode assemblies, which are formed by stacking or winding positive electrode plates, negative electrode plates, and a separator. The separator is located between adjacent positive and negative electrode plates to insulate them. At least one end of the electrode assembly has a tab, and one end of the adapter plate is electrically connected to the tab, while the other end is electrically connected to the electrode post.

[0024] It needs to be explained that the battery casing, specifically, is located on the outermost side of the battery cell and is used to protect the battery cell; the battery casing material can be, but is not limited to, aluminum alloy, steel, etc.; specifically, it can be aluminum-manganese alloy, aluminum-magnesium alloy, stainless steel, nickel-plated steel, etc.

[0025] The adapter plate is used to realize current transmission and make electrical connections with the tabs and posts. The adapter plate can be made of aluminum, copper, etc.

[0026] As the battery current output terminal, the terminal is used to connect to external busbars, etc., to realize series and parallel connection between batteries; the terminal can include positive terminal and negative terminal; the material of the terminal can be aluminum, copper, copper-aluminum composite, etc.

[0027] The tabs serve as the current output terminals inside the battery cell, and are used for electrical connection with terminals, etc. Tabs can be cut from current collectors or are separately molded metal parts. It is understood that the positive tab is electrically connected to the positive electrode plate in the battery cell, and the negative tab is electrically connected to the negative electrode plate in the battery cell.

[0028] Furthermore, adjacent individual cells are connected in parallel or series via busbars. The busbars are fixed to the terminals of the individual cells by welding. The busbars can be made of aluminum, copper, or copper-aluminum composite materials.

[0029] like Figures 1 to 8 As shown, this utility model relates to a battery, including a terminal post 1, a cover plate 2, and an insulating component 3. The terminal post 1 is mounted on the cover plate 2, and the insulating component 3 is located between the outer periphery of the terminal post 1 and the cover plate 2. The upper end face of the terminal post 1 is used for welding to a busbar, and a solder mark 11 is formed on the upper end face of the terminal post 1.

[0030] The area of ​​the solder mark 11 is A, in mm. 2 The minimum distance between the solder mark 11 and the insulating component 3 is D, in mm, and the above parameters satisfy:

[0031]

[0032] The values ​​of A / D can also be 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 100, 120, 140, 160, 180, 200, 220, 240, 260, 280, 300, 320 or 340.

[0033] In this invention, when the terminal 1 is welded to the busbar, a large amount of heat is generated. The heat is transferred from the terminal 1 to the insulating component 3. Since the insulating component 3 has a low melting point, it is easy to melt due to heat, resulting in insulation failure and increasing the risk of battery short circuit. The larger the area A of the weld mark 11 formed by welding the terminal 1 and the busbar, the better the current carrying capacity. However, the heat generated during welding is also greater, which can easily cause the insulating component 3 to melt. Conversely, the smaller the area A of the weld mark 11, the worse the current carrying capacity, and the less likely the insulating component 3 is to deform or melt. The larger the minimum distance D between the weld mark 11 and the insulating component 3, the farther the welding position is from the insulating component 3. Thus, the insulating component 3 is less likely to deform due to heat, but the area of ​​the weld mark 11 is relatively small, affecting the current carrying performance. Conversely, the smaller the minimum distance D between the weld mark 11 and the insulating component 3, the more likely the insulating component 3 is to deform and melt due to heat, but the current carrying performance is good. Therefore, the current carrying capacity of the battery and whether the insulating component 3 deforms and melts are affected by the area A of the weld mark 11 and the minimum distance D between the weld mark 11 and the insulating component 3.

[0034] Therefore, the A / D ratio can be used to ensure the battery's current carrying capacity while preventing the insulating component 3 from melting and deforming due to heat. While a large A / D ratio improves current carrying capacity, it also makes the insulating component 3 more susceptible to melting and deformation during welding, affecting insulation performance. Conversely, a small A / D ratio ensures the insulating component 3 is less prone to melting and deformation, but results in poor current carrying capacity. Therefore, it is necessary to maintain a suitable A / D ratio. This ensures the battery's overcurrent capacity and prevents the insulating component 3 from melting or deforming due to heat.

[0035] Specifically, the cover plate 2 has a through hole, the insulating member 3 is fixed to the inner circumference of the through hole, the outer side of the pole post 1 has a step 13 along the circumferential direction, the insulating member 3 wraps around the upper and lower parts of the step 13 to fix the pole post 1, and a sealing ring 6 is also provided between the lower outer circumference of the pole post 1 and the inner wall of the through hole to play a sealing role.

[0036] In some embodiments, maintain 40mm 2 ≤Amm 2 ≤180mm 2 This ensures that the area of ​​the solder mark 11 remains within a suitable range. The value of A can also be 45 mm. 2 50mm 2 55mm 2 60mm 2 65mm 2 70mm 2 75mm 2 80mm 2 85mm2 90mm 2 95mm 2 100mm 2 105mm 2 110mm 2 115mm 2 120mm 2 125mm 2 130mm 2 135mm 2 140mm 2 145mm 2 150mm 2 160mm 2 Or 170mm 2 .

[0037] In some embodiments, the busbar and the terminal 1 are laser welded together, so the temperature generated during welding is relatively high. This is because it is necessary to ensure that the A / D ratio is within a reasonable range and to maximize the overcurrent capacity of the battery while avoiding the insulation 3 from easily melting and deforming due to heat.

[0038] In some embodiments, the distance between the solder mark 11 and the insulating element 3 is kept within a reasonable range, with a minimum distance D between them. The value of D can also be 0.7mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.7mm, 4mm, 4.2mm, 4.5mm, 4.7mm, or 4.9mm.

[0039] Combination Figure 5 and Figure 6 As shown, in some embodiments, the top surface of the pole post 1 protrudes beyond the top surface of the insulating member 3; and the area of ​​the solder mark 11 is A, in mm. 2 The minimum distance between the solder mark 11 and the insulating component 3 is D, in mm, and the above parameters satisfy:

[0040]

[0041] Specifically, since the top surface of the electrode post 1 protrudes beyond the top surface of the insulating component 3, the heat transfer distance between the top surface of the electrode post 1 and the insulating component 3 is increased, reducing the heat transferred to the insulating component 3 during welding of the electrode post 1 to the busbar. This reduces the impact on the insulating component 3, thus maintaining... This ensures the battery's overcurrent capacity and prevents the insulating component 3 from melting or deforming due to heat.

[0042] Preferably, the distance in the height direction between the top surface of the pole post 1 and the top surface of the insulating member 3 is C, in mm, and C satisfies: 0.5mm≤C≤1mm; wherein, the value of C can also be 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm or 0.95mm, and;

[0043]

[0044] That is, keeping the distance between the top surface of the electrode post 1 and the top surface of the insulating component 3 in the height direction within the range of 0.5mm-1mm can reduce the impact on the insulating component 3 when the electrode post 1 is welded to the busbar, and also ensure that the energy density of the battery is not affected.

[0045] Combination Figure 7 As shown, in some embodiments, the top surface of the insulating member 3 protrudes beyond the top surface of the pole post 1; and;

[0046]

[0047] That is, since the electrode post 1 is recessed within the insulating component 3, the heat generated by welding the electrode post 1 to the busbar has a greater impact on the insulating component 3. To reduce the impact on the insulating component 3, the minimum distance D between the solder mark 11 and the insulating component 3 needs to be reduced. Therefore, it is necessary to maintain...

[0048] It should be noted that, since the top surface of the insulating component 3 protrudes from the top surface of the pole post 1, in order to ensure the welding of the busbar and the pole post 1, the busbar should be provided with a protrusion at the position corresponding to the pole post 1 so as to facilitate the welding of the busbar and the pole post 1.

[0049] In some embodiments, the minimum distance between the edge of the top surface of the pole post 1 and the insulating member 3 is E, in mm, and E satisfies: 0 mm ≤ E ≤ 3 mm. The value of E can also be 0.2 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, or 2.9 mm.

[0050] That is, when the top surface of the terminal 1 is welded to the busbar, the heat is first transferred to the edge of the terminal 1 and then to the insulating component 3. By keeping 0mm≤E≤3mm, the heat generated during welding is prevented from having a significant impact on the insulating component 3, and the distance between the edge of the top surface of the terminal 1 and the insulating component 3 is also prevented from being too large, which would affect the energy density of the battery.

[0051] In some embodiments, the solder mark 11 is rectangular, and each of the four corners of the rectangular solder mark 11 is provided with an inner rounded corner 111. The size of the inner rounded corner 111 is R, in mm, and R satisfies: 0.5mm ≤ R ≤ 3mm. The value of R can also be 0.7mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.7mm, 2mm, 2.2mm, 2.5mm, 2.7mm, or 2.9mm.

[0052] Since the larger the inner radius 111 of the solder mark 11 is, the area of ​​the solder mark 11 needs to be reduced in order to avoid reducing the minimum distance between the solder mark 11 and the insulating component 3. Therefore, the size of the inner radius 111 will affect the area of ​​the solder mark 11. Thus, it is necessary to keep 0.5mm≤R≤3mm in order to ensure the current carrying capacity and reduce the impact on the insulating component 3 during welding.

[0053] In some embodiments, a positioning hole 12 is provided on the top surface of the electrode post 1. The positioning hole 12 is used to position the busbar. The minimum distance between the solder mark 11 and the positioning hole 12 is F, in mm, and F satisfies: 2mm ≤ F ≤ 8mm. The value of F can also be 2.2mm, 2.5mm, 2.7mm, 3mm, 3.2mm, 3.5mm, 3.7mm, 4mm, 4.2mm, 4.5mm, 4.7mm, 5mm, 5.2mm, 5.5mm, 5.7mm, 6mm, 6.2mm, 6.5mm, 6.7mm, 7mm, 7.2mm, 7.5mm, 7.7mm, or 7.9mm.

[0054] Since the heat generated when the electrode 1 is welded to the busbar will be transferred to the positioning hole 12, if the solder mark 11 is too close to the positioning hole 12, the edge of the positioning hole 12 will be affected by the welding stress, which will cause it to warp and deform, thus affecting the connection strength between the electrode 1 and the busbar. Therefore, it is necessary to keep 2mm≤F≤8mm to ensure the stability of the connection between the electrode 1 and the busbar.

[0055] In some embodiments, the melting point of the insulating element 3 is k, in °C, where 200 °C ≤ k ≤ 380 °C, to prevent it from easily melting upon heating.

[0056] Specifically, the insulating element 3 may be made of PPS (polyphenylene sulfide), nylon, PI (polyimide), PP or PET.

[0057] In some embodiments, the pole post 1 is racetrack shaped, which can increase the contact area of ​​the top surface of the pole post 1, thereby facilitating welding and fixing with the busbar.

[0058] In some embodiments, the solder mark is linear, and the width of the cross-section of the solder mark is W, in mm, where 1 mm ≤ W ≤ 5 mm. The value of W can also be 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.2 mm, 2.5 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm, 3.7 mm, 4 mm, 4.2 mm, 4.5 mm, 4.7 mm, or 4.9 mm.

[0059] That is, the area of ​​the solder mark 11 can be reduced, thereby reducing the heat generated during the reduction and ensuring that the insulating part 3 will not melt or deform due to heat.

[0060] The solder mark 11 is in the shape of a racetrack frame, and has a long side and a short side. The width of the cross-section of the long side of the solder mark 11 is smaller than the width of the cross-section of the short side of the solder mark 11. A positioning hole 12 is provided on the top surface of the pole post 1, and the positioning hole 12 is located inside the solder mark 11.

[0061] Since the side of the insulating component 3 closest to the short side of the solder mark 11 is far from the positioning hole 12, the width of the cross-section of the short side of the solder mark 11 can be increased to increase the flow area and improve the flow performance.

[0062] In some embodiments, the thickness of the end of the insulating member 3 near the top surface of the pole post 1 is T, in mm, where 0.5 mm ≤ T ≤ 2 mm. The value of T can also be 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.7 mm, or 1.9 mm.

[0063] The greater the thickness of the end of the insulating member 3 near the top surface of the pole post 1, the more space it will occupy; conversely, the smaller the thickness, the more prone it is to deformation, affecting the stability of the pole post 1. Therefore, maintaining a thickness of 0.5mm ≤ T ≤ 2mm ensures the stability of the pole post 1 without occupying too much space.

[0064] In some embodiments, the battery further includes a housing 4 and a battery cell 5, the housing 4 having an opening at the top, the battery cell 5 being disposed inside the housing 4, a cover being disposed at the opening of the housing 4, and the battery cell 5 being electrically connected to the terminal post 1.

[0065] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery, characterized in that, The device includes a terminal post, a cover plate, and an insulating component. The terminal post is mounted on the cover plate, and the insulating component is located between the outer periphery of the terminal post and the cover plate. The upper end face of the terminal post is used for welding to a busbar and has solder marks formed thereon. The area of ​​the solder mark is A, in mm. 2 The minimum distance between the solder mark and the insulating component is D, in mm, and the above parameters satisfy:

2. The battery according to claim 1, characterized in that, 40mm 2 ≤Amm 2 ≤180mm 2 。 3. The battery according to claim 1, characterized in that, 0.5mm≤Dmm≤5mm.

4. The battery according to claim 1, characterized in that, The top surface of the pole protrudes beyond the top surface of the insulator; and, The area of ​​the solder mark is A, in mm. 2 The minimum distance between the solder mark and the insulating component is D, in mm, and the above parameters satisfy:

5. The battery according to claim 4, characterized in that, The distance in the height direction between the top surface of the pole and the top surface of the insulating element is C, in mm, and C satisfies: 0.5 mm ≤ C ≤ 1 mm; and, 6. The battery according to claim 1, characterized in that, The top surface of the insulating element protrudes beyond the top surface of the pole post; and, 7. The battery according to claim 1, characterized in that, The minimum distance between the edge of the top surface of the pole and the insulating component is E, in mm, and E satisfies: 0mm≤E≤3mm.

8. The battery according to claim 1, characterized in that, The solder mark has an inner rounded corner, the size of which is R in mm, and R satisfies: 0.5mm≤R≤3mm.

9. The battery according to claim 1, characterized in that, The top surface of the pole post is provided with a positioning hole. The minimum distance between the solder mark and the positioning hole is F, in mm, and F satisfies: 2mm≤F≤8mm.

10. The battery according to claim 1, characterized in that, The melting point of the insulating component is k, in °C, where 200 °C ≤ k ≤ 380 °C.

11. The battery according to claim 1, characterized in that, The pole is shaped like a racetrack.

12. The battery according to claim 1, characterized in that, The solder mark is linear, and the width of the cross-section of the solder mark is W, in mm, where 1 mm ≤ W ≤ 5 mm.

13. The battery according to claim 1, characterized in that, The solder mark is in the shape of a racetrack frame, and the solder mark has a long side and a short side. The width of the cross-section of the long side of the solder mark is smaller than the width of the cross-section of the short side of the solder mark.

14. The battery according to claim 1, characterized in that, The thickness of the end of the insulating component near the top surface of the pole is T, in mm, where 0.5 mm ≤ T ≤ 2 mm.

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