Square battery cell and power supply device

Abstract

The utility model discloses a square battery monomer and power supply device relates to square battery monomer technical field, wherein, square battery monomer includes casing, is equipped with the accommodating groove of one end opening, the electric core is in accommodating groove, the electric core includes negative pole, positive pole and diaphragm, the diaphragm includes first bending part and is equipped with the first flat portion of first bending part both sides, first installation groove is formed between first bending part respectively with two first flat portion, the positive pole is equipped in first installation groove, to make diaphragm cladding in the two sides of positive pole along the first direction, the negative pole cladding in the two sides of diaphragm along the first direction, the utility model provides technical scheme for the application through the positive pole from first insertion interface place and insert first installation groove from top to bottom, two first flat portion directly cladding in the two sides of positive pole, reduced the thickness of diaphragm, and then reduced the overall thickness of square battery monomer.

Description

TECHNICAL FIELD

[0001] The utility model relates to square battery monomer technical field especially square battery monomer and power supply device. BACKGROUND

[0002] The energy density of square battery monomer is usually higher than other types of battery system, under the same volume or weight condition, square battery monomer can provide more abundant electric energy output for electric equipment. At present, the common square battery monomer on market adopts cylindrical structure, and the overall thickness of the cylindrical battery is big, thereby limiting the application range of square battery monomer. SUMMARY

[0003] The utility model discloses a square battery monomer and power supply device, which aims to reduce the thickness of square battery monomer.

[0004] To achieve the above object, the utility model discloses a square battery monomer, including the casing, is equipped with the accommodating groove of one end opening, the electric core is in accommodating groove, the electric core includes negative pole, positive pole and diaphragm, the diaphragm includes first bending part and first flat portion on both sides of first bending part, first installation groove is formed between first bending part and two first flat portion respectively, the positive pole is located in first installation groove, so that the diaphragm is covered in two sides of positive pole along the first direction, the negative pole is covered in two sides of diaphragm along the first direction, and the negative pole is located on the side of diaphragm away from the positive pole.

[0005] In an embodiment, the casing is provided with a first side and a second side on both sides along the first direction, and the distance between the first side and the second side in the first direction is not less than 4 mm and not greater than 10 mm.

[0006] In an embodiment, the distance between the first side and the second side in the first direction is not less than 6 mm and not greater than 7 mm.

[0007] In an embodiment, the negative pole includes a second bending part and a second flat portion on both sides of the second bending part, the second bending part forms a second installation groove with the two second flat portions respectively, the two second flat portions abut against one side of the first flat portion away from the positive pole, and the second bending part abuts against the bottom wall of the diaphragm.

[0008] In an embodiment, one end of the first bending part away from the first installation groove is provided in an outward convex arc shape, and / or one end of the second bending part away from the second installation groove is provided in an outward convex arc shape.

[0009] In an embodiment, the square battery cell further comprises a cover plate, the cover plate is welded at the opening of the shell.

[0010] In an embodiment, the square battery cell further comprises a first pin and a second pin, the cover plate is provided with a first mounting hole and a second mounting hole, the first pin is arranged in the first mounting hole, the first pin is electrically connected with the positive electrode, the second pin is arranged in the second mounting hole, and the second pin is electrically connected with the negative electrode.

[0011] In an embodiment, the square battery cell further comprises a third pin and a fourth pin, the shell is provided with a third mounting hole and a fourth mounting hole away from the opening, the third pin is arranged in the third mounting hole, the third pin is electrically connected with the negative electrode, the fourth pin is arranged in the fourth mounting hole, and the fourth pin is electrically connected with the negative electrode.

[0012] In an embodiment, the shell has a quadrilateral shape.

[0013] The utility model also provides a power supply device, including square battery cell in any of above-mentioned embodiments.

[0014] The technical scheme of the utility model discloses a square battery cell, which comprises a shell, a positive electrode, a negative electrode and a diaphragm, wherein the positive electrode is arranged in the shell, the negative electrode is arranged in the shell, the diaphragm is arranged between the positive electrode and the negative electrode, and the diaphragm is arranged on the positive electrode and the negative electrode. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

[0016] Figure 1 It is an exploded structural schematic view of an embodiment of the square battery cell provided by the utility model;

[0017] Figure 2 It is a structural side view of an embodiment of the square battery cell provided by the utility model;

[0018] Figure 3The utility model provides a square battery monomer one embodiment angle's structure side view is provided.

[0019] Figure 4 The utility model provides a square battery monomer one embodiment's structure plan view is provided.

[0020] Explanation of the attached drawings:

[0021] 1, shell, 11, accommodating groove, 111, opening, 12, third mounting hole, 13, fourth mounting hole, 2, electric core, 21, negative pole, 211, second installation groove, 212, second bending part, 213, second straight part, 22, positive pole, 23, diaphragm, 231, first installation groove, 232, first bending part, 233, first straight part, 3, cover plate, 31, first mounting hole, 32, second mounting hole, 4, first pin, 41, second pin, 42, third pin, 43, fourth pin.

[0022] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment. Specific implementation

[0023] The technical scheme in the utility model embodiment will be clearly and completely described below with reference to the drawings in the utility model embodiment, and obviously, the described embodiment is only a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the range of the utility model protection.

[0024] It should be noted that if the embodiment of the utility model involves directional indication (such as up, down, left, right, front, back, etc.), the directional indication is only used to explain the relative position relationship, movement condition and the like between the components in a certain posture, if the certain posture changes, then the directional indication also changes accordingly.

[0025] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0026] The utility model provides a square battery monomer.

[0027] Please refer to Figure 1 、 Figure 2 、 Figure 3 And Figure 4 , in an embodiment of the utility model, the square battery monomer includes shell 1 and electric core 2. The shell 1 is equipped with the accommodating groove 11 of one end opening 111;The electric core 2 is in the accommodating groove 11, the electric core 2 includes negative pole 21, positive pole 22 and diaphragm 23, the diaphragm 23 includes first bending part 232 and the first flat part 233 at both sides of the first bending part 232, the first mounting groove 231 is formed between the first bending part 232 and two first flat parts 233 respectively, the positive pole 22 is in the first mounting groove 231, so that the diaphragm 23 is covered in the two sides of the positive pole 22 along the first direction, the negative pole 21 is covered in the two sides of the diaphragm 23 along the first direction, and the negative pole 21 is located on the side of the diaphragm 23 away from the positive pole 22.

[0028] The technical scheme of the utility model adopts the diaphragm 23 of multiple layers in the prior art and is covered on the positive pole 22 by winding, the electric core 2 is inserted into the first mounting groove 231 from the first insertion port from top to bottom, and the two first flat parts 233 are directly covered on the two sides of the positive pole 22, so that the thickness of the diaphragm 23 is reduced, the internal space of the shell 1 is saved, the overall thickness of the electric core 2 is further reduced, and the overall thickness of the square battery monomer is further reduced. The negative pole 21 is covered on the two sides of the diaphragm 23 along the first direction and is located on the side of the diaphragm 23 away from the positive pole 22, so that the diaphragm 23 plays an isolating role between the positive pole 22 and the negative pole 21.

[0029] In the embodiment, the square battery monomer can be applied to a power supply device, and the power supply device can include a circuit protection board. The square battery monomer is electrically connected to the circuit protection board to supply power to the circuit protection board. The inside of the shell 1 can be provided with a receiving groove 11, which can be used for installing the power core 2 and can also be used for storing the electrolyte storage cavity. The electrolyte can be preferably a solution of sulfuryl chloride as a solvent and anhydrous lithium tetrachloroaluminate as a solute. One end of the receiving groove 11 is provided with an opening 111, which is more convenient for the power core 2 to be installed in the receiving groove 11, thereby optimizing the assembly process of the power core 2. The negative electrode 21 can be made of a lithium material, the positive electrode 22 can be made of carbon black material, and the diaphragm 23 can be made of glass fiber material. The diaphragm 23 can include a first bending portion 232 and a first flat portion 233 provided on the opposite sides of the first bending portion 232, and the first bending portion 232 is located on the side away from the opening 111. The two first flat portions 233 jointly enclose the first installation groove 231 with the first bending portion 232, and the side of the first installation groove 231 away from the first bending portion 232 has a first plug-in port. The positive electrode 22 is inserted into the first installation groove 231 from the first plug-in port, so that the diaphragm 23 is wrapped on both sides of the positive electrode 22 along the first direction. Thus, the traditional way of winding the positive electrode 22 with multiple layers of diaphragm 23 is omitted, thereby significantly reducing the space occupied by the diaphragm 23 part, which helps to reduce the size of the power core 2 in the thickness direction, thereby facilitating the thin design of the battery.

[0030] As shown in Figure 1 and Figure 3 In an embodiment, the shell 1 is provided with a first side and a second side on both sides along the first direction. In the first direction, the distance between the first side and the second side is not less than 4 mm and not greater than 10 mm.

[0031] In the embodiment, the first direction can be consistent with the thickness direction of the square battery monomer. In the first direction, the distance between the first side and the second side can be defined as a first preset interval D1, and the first preset interval D1 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. Within this range, the size of the current that can be provided by the square battery monomer can be better adjusted by adjusting the first preset interval D1, while avoiding excessive increase or attenuation of the thickness of the square battery monomer, thereby affecting the power supply of the square battery monomer.

[0032] In the embodiment, the square battery cell of the application can provide an increased current with the increase of the thickness of the square battery cell, specifically, the square battery cell of the application has a rated voltage of 3.6 V and can provide a current of 0.6-1.6 mA, which is more suitable for low-power and long-life use scenarios.

[0033] As shown in Figure 1 and Figure 3 In an embodiment, the distance between the first side and the second side in the first direction is not less than 6 mm and not greater than 7 mm.

[0034] In the embodiment, the first direction can be consistent with the thickness direction of the square battery cell. In the first direction, the distance between the first side and the second side can be defined as a first preset distance D1, the first preset distance can be D1, and the first preset distance D1 can be further defined as 6 mm and 7 mm. Within this range, the size of the current that can be provided by the square battery cell can be better adjusted by adjusting the first preset distance D1, while avoiding excessive increase or attenuation of the thickness of the square battery cell, thereby affecting the power supply of the square battery cell.

[0035] As shown in Figure 1 In an embodiment, the negative electrode 21 includes a second bending portion 212 and a second flat portion 213 arranged on both sides of the second bending portion 212, the second bending portion 212 and the two second flat portions 213 form the second mounting groove 211, the two second flat portions 213 are respectively in abutment with the side of the first flat portion 233 away from the positive electrode 22, and the second bending portion 212 is in abutment with the bottom wall of the separator 23.

[0036] In the embodiment, the two second flat portions 213 and the second bending portion 212 together form the second mounting groove 211, and the side of the second mounting groove 211 away from the second bending portion 212 has a second insertion port. The separator 23 is inserted into the second mounting groove 211 from the second insertion port, so that the negative electrode 21 covers the two sides of the separator 23 in the first direction, thereby eliminating the traditional mode of winding and covering the separator 23 and the positive electrode 22 with multiple layers of negative electrode 21, thereby significantly reducing the space occupied by the negative electrode 21 part while ensuring good electrical insulation and isolation performance, which helps to reduce the size of the battery cell 2 in the thickness direction, thereby facilitating the thin design of the battery. The abutment of the second bending portion 212 and the bottom wall of the separator 23 can effectively prevent electrolyte leakage, and the close contact of the second flat portion 213 and the separator 23 enhances the stability of the connection between the negative electrode 21 and the separator 23.

[0037] As shown in Figure 1As shown in the drawings, in an embodiment, the first bending part 232 is arranged in an outward convex arc shape away from one end of the first mounting slot 231, and / or the second bending part 212 is arranged in an outward convex arc shape away from one end of the second mounting slot 211.

[0038] In the present embodiment, the arc-shaped design of the first bending part 232 can alleviate the stress concentration of the diaphragm 23 in the bending area, avoiding material fatigue fracture caused by repeated charging and discharging. The arc-shaped structure of the second bending part 212 helps to improve the contact state of the negative electrode 21 and the bottom wall of the diaphragm 23, reducing mechanical interference during assembly. Compared with the existing technology in which the bending area of the diaphragm 23 and the negative electrode 21 is designed in a right-angle bending, the arc-shaped structure of the first bending part 232 and the second bending part 212 of the present application can make the electrolyte more evenly distributed, thereby improving the stability of the battery monomer cycle.

[0039] As shown in the drawings, Figure 1 , Figure 2 and Figure 3 , in an embodiment, the square battery monomer further comprises a cover plate 3, and the cover plate 3 is welded at the opening 111 of the shell 1.

[0040] In the present embodiment, the cover plate 3 is made of a metal material, such as aluminum alloy or stainless steel, and is sealed and connected with the shell 1 by laser welding or ultrasonic welding. Specifically, the cover plate 3 is provided with a downwardly extending flange structure, and the flange structure forms a welding mating surface with the upper edge of the opening 111 of the shell 1, thereby increasing the contact area of the cover plate 3 and the shell 1, and further improving the stability of the connection between the cover plate 3 and the shell 1. The present application can effectively solve the reliability problem of the top sealing of the battery monomer by welding the cover plate 3 at the opening 111 of the shell 1.

[0041] As shown in the drawings, Figure 1 , Figure 2 and Figure 3 , in an embodiment, the square battery monomer further comprises a first lead 4 and a second lead 41, the cover plate 3 is provided with a first mounting hole 31 and a second mounting hole 32, the first lead 4 is arranged in the first mounting hole 31, the first lead 4 is electrically connected with the positive electrode 22, the second lead 41 is arranged in the second mounting hole 32, and the second lead 41 is electrically connected with the negative electrode 21.

[0042] In the embodiment, the first pin 4 is arranged to pass through the cover plate 3 and is electrically connected to the positive electrode 22, and the other end of the first pin 4 is welded to the welding hole of the circuit protection plate. The second pin 41 is arranged to pass through the cover plate 3 and is electrically connected to the negative electrode 21, and the other end of the second pin 41 is welded to the welding hole of the circuit protection plate. Thus, the square battery monomer is more convenient to be electrically connected to the circuit protection plate. In order to improve the stability of the connection between the first pin 4 and the cover plate 3, the cover plate 3 is provided with a first mounting hole 31 and a second mounting hole 32. The first pin 4 passes through the first mounting hole 31, and the second pin 41 passes through the second mounting hole 32. Thus, by arranging the first pin 4 and the second pin 41 on the cover plate 3, the battery monomer can be applied to a wider range of application scenarios while maintaining high energy density.

[0043] As shown in Figure 4 In an embodiment, the square battery monomer further includes a third pin 42 and a fourth pin 43. The shell 1 is provided with a third mounting hole 12 and a fourth mounting hole 13 away from the opening 111. The third pin 42 passes through the third mounting hole 12 and is electrically connected to the negative electrode 21. The fourth pin 43 is arranged in the fourth mounting hole 13 and is electrically connected to the negative electrode 21.

[0044] In the embodiment, the third pin 42 is arranged to pass through the shell 1 and is electrically connected to the negative electrode 21, and the other end of the third pin 42 is welded to the welding hole of the circuit protection plate. The fourth pin 43 is arranged to pass through the shell 1 and is electrically connected to the negative electrode 21, and the other end of the fourth pin 43 is welded to the welding hole of the circuit protection plate. Thus, the square battery monomer is more convenient to be electrically connected to the circuit protection plate, and the square battery monomer can be applied to different circuit protection plates with different numbers of welding holes, thereby improving the application range of the square battery monomer. In order to improve the stability of the connection between the third pin 42 and the shell 1, the shell 1 can be provided with a third mounting hole 12 and a fourth mounting hole 13. The third pin 42 passes through the third mounting hole 12, and the fourth pin 43 passes through the fourth mounting hole 13. Thus, by arranging the third pin 42 and the fourth pin 43 on the shell 1, the battery monomer can be applied to a wider range of application scenarios while maintaining high energy density.

[0045] As shown in Figure 1 In an embodiment, the shell 1 has a quadrilateral shape.

[0046] In the embodiment, the shell 1 adopts a quadrilateral structure design, wherein the quadrilateral includes but is not limited to a regular geometric shape such as a rectangle, a square or a trapezoid. As a preferred embodiment, the shell 1 adopts a cuboid structure, wherein five surfaces of the shell 1 are planes and adjacent surfaces are connected at right angles. By designing the shell 1 as a quadrilateral structure, the space utilization of the battery monomer can be effectively improved. Compared with the battery monomer of the prior art which adopts a cylindrical shell 1, the shell 1 of the application is a quadrilateral, so that the battery monomer can be arranged in a flat shape, which is more suitable for low-power power supply devices welded on the protection plate. The quadrilateral shell 1 is more convenient for welding and sealing with the cover plate 3, and the increase of the welding contact area improves the sealing reliability.

[0047] The utility model further provides a power supply device, the power supply device includes circuit protection board and square battery monomer, the specific structure of square battery monomer refers to the above embodiment, because the power supply device of the utility model adopts all the technical schemes of the above all embodiments, therefore at least has all the beneficial effects brought by the technical scheme of the above embodiment, does not repeat here one by one. Among them, square battery monomer is welded on the hole position of circuit protection board through first pin 4 and second pin 41, or, square battery monomer is welded on the corresponding hole position of circuit protection board through first pin 4, second pin 41, third pin 42 and fourth pin 43 respectively, so that circuit protection board and square battery monomer are electrically connected.

[0048] The above-mentioned is only the exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure transformation made by the utility model specification and the attached drawings, or direct / indirect application in other related technical fields under the technical concept of the utility model is included in the patent protection range of the utility model.

Claims

1. A square battery cell, characterized by, The square battery cell comprises: a housing provided with an accommodating groove with one end being open; an electric core provided in the accommodating groove, the electric core comprising a negative electrode, a positive electrode and a diaphragm, the diaphragm comprising a first bending part and first flat parts provided on both sides of the first bending part, the first bending part and the two first flat parts forming a first mounting groove therebetween respectively, the positive electrode being provided in the first mounting groove so that the diaphragm covers both sides of the positive electrode in a first direction, the negative electrode covering both sides of the diaphragm in the first direction, the negative electrode being located on a side of the diaphragm away from the positive electrode.

2. The square battery cell of claim 1, wherein, The housing is provided with a first side surface and a second side surface on both sides in the first direction, the distance between the first side surface and the second side surface in the first direction being not less than 4 mm and not more than 10 mm.

3. The square battery cell of claim 2, wherein, The distance between the first side surface and the second side surface in the first direction is not less than 6 mm and not more than 7 mm.

4. The square battery cell of claim 1, wherein, The negative electrode comprises a second bending part and second flat parts provided on both sides of the second bending part, the second bending part and the two second flat parts forming a second mounting groove therebetween respectively, the two second flat parts abutting against a side of the first flat part away from the positive electrode respectively, and the second bending part abutting against a bottom wall of the diaphragm.

5. The square battery cell of claim 4, wherein, An end of the first bending part away from the first mounting groove is provided in an outward convex arc shape, and / or an end of the second bending part away from the second mounting groove is provided in an outward convex arc shape.

6. The square battery cell of claim 1, wherein, The square battery cell further comprises a cover plate welded to the opening of the housing.

7. The square battery cell of claim 6, wherein, The square battery cell further comprises a first lead and a second lead, the cover plate being provided with a first mounting hole and a second mounting hole, the first lead being provided in the first mounting hole, the first lead being electrically connected to the positive electrode, the second lead being provided in the second mounting hole, the second lead being electrically connected to the negative electrode.

8. The square battery cell of claim 6, wherein, The square battery cell further comprises a third lead and a fourth lead, the housing being provided with a third mounting hole and a fourth mounting hole on a side away from the opening, the third lead being provided in the third mounting hole, the third lead being electrically connected to the negative electrode, the fourth lead being provided in the fourth mounting hole, the fourth lead being electrically connected to the negative electrode.

9. The square battery cell of claim 1, wherein, The housing has a quadrilateral shape.

10. A power supply device, characterized by comprising: The square battery cell comprises any one of claims 1 to 9.

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