Lithium battery

Abstract

The lithium battery comprises a shell, a roll core, a circuit board, a protective cover and a positive electrode body, the circuit board is provided with an element side and a polarity side which are oppositely arranged, the shell is provided with a containing groove, the roll core is arranged in the containing groove, the circuit board is arranged in a groove opening of the containing groove, the element side faces the roll core, and the protective cover is arranged on the element side. The positive electrode body is provided on the polarity side. The electronic components are concentrated on the component side of the circuit board, the component side faces the roll core, the protective cover protects the component side and prevents electrolyte from permeating to damage the electronic components, the positive electrode end of the roll core is connected with the circuit board through the protective cover, then the positive electrode body serves as a positive electrode to be led out, and the shell is connected with the negative electrode end of the roll core to serve as a negative electrode. The element side of the circuit board is arranged inwards, so that the space in the accommodating groove can be fully utilized, the problem of large volume caused by outward traditional electronic elements is solved, the volume of the lithium battery is reduced, and the requirements of current products are met.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage products, and in particular to a lithium battery. Background Art

[0002] Lithium batteries are used in many fields due to their many advantages. Based on the normal use of lithium batteries and the protection during charging and discharging, lithium batteries need to be connected to corresponding circuit protection boards for normal use. The circuit protection board can monitor the voltage, current, temperature and other parameters of lithium batteries to achieve charging and discharging protection and prevent battery failures such as overcharging, over-discharging and short circuit.

[0003] The common lithium battery currently has the problem of increased volume when combined with the circuit protection board. Many current products are pursuing further miniaturization. Oversized lithium batteries can no longer meet the needs of current products, and their usage scenarios are gradually limited. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a lithium battery.

[0005] The utility model discloses a lithium battery, comprising: a shell, a winding core, a circuit board, a protective cover and a positive electrode body, the circuit board having a component side and a polarity side arranged opposite to each other, the shell having a receiving groove, the winding core being arranged in the receiving groove, the circuit board being arranged in a notch of the receiving groove, with the component side facing the winding core, the protective cover being arranged on the component side, and the positive electrode body being arranged on the polarity side;

[0006] The negative terminal of the winding core is conductively connected to the polarity side through the shell, and the positive terminal of the winding core is conductively connected to the positive electrode body through the protective cover.

[0007] According to one embodiment of the present invention, a negative electrode body is provided on the polarity side, and the shell is conductively connected to the negative electrode body.

[0008] According to an embodiment of the present invention, a first sealing body is further included, and the first sealing body is arranged between the protective cover and the wall surface of the containing groove.

[0009] According to an embodiment of the present invention, the first sealing body is made of plastic or silicone.

[0010] According to one embodiment of the present invention, a protective body is further included, and the protective body is arranged between the protective cover and the component side.

[0011] According to one embodiment of the utility model, an explosion-proof body is also included, and the protective cover is provided with an exhaust hole, and the explosion-proof body is respectively connected to the wall surface of the exhaust hole and the positive end of the winding core.

[0012] According to one embodiment of the utility model, a second sealing body is further included. The second sealing body is located between the explosion-proof body and the protective cover. One end of the explosion-proof body passes through the second sealing body and is connected to the wall surface of the exhaust hole.

[0013] According to an embodiment of the present invention, the protector is a PTC thermistor.

[0014] According to an embodiment of the present invention, the explosion-proof body is a CID explosion-proof valve.

[0015] According to an embodiment of the present invention, a groove is formed inwardly of the shell.

[0016] The beneficial effect of the utility model is that the electronic components are concentrated on the component side of the circuit board, the component side faces the winding core, the protective cover protects the component side to prevent the electrolyte from seeping in and damaging the electronic components, the positive end of the winding core is connected to the circuit board through the protective cover, and then the positive electrode body is used as the positive electrode to lead out, and the shell is connected to the negative end of the winding core as the negative electrode; the component side of the circuit board is set inward, which can make full use of the space in the accommodating groove, solve the problem of large volume caused by traditional electronic components facing outward, and reduce the volume of lithium batteries, which is conducive to meeting the needs of current products. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] Figure 1 Schematic diagram of the three-dimensional structure of a lithium battery;

[0019] Figure 2 is a cross-sectional schematic diagram of a lithium battery;

[0020] Figure 3 for Figure 2 A partial enlarged view of .

[0021] Description of Reference Numerals

[0022] 101, housing; 1011, receiving groove; 1012, groove;

[0023] 102, roll core;

[0024] 103, circuit board; 1031, component side; 1032, polarity side; 1033, negative electrode;

[0025] 104, protective cover; 1041, exhaust hole;

[0026] 105, positive electrode;

[0027] 106. a first sealing body;

[0028] 107. Protective body;

[0029] 108. Explosion-proof body;

[0030] 109. A second sealing body. DETAILED DESCRIPTION

[0031] The following will disclose multiple embodiments of the present invention with drawings. For the purpose of clear description, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are not necessary. In addition, in order to simplify the drawings, some conventional structures and components will be depicted in a simple schematic manner in the drawings.

[0032] In addition, in the present utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present utility model. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0033] like Figure 1-Figure 3 As stated, Figure 1 Schematic diagram of the three-dimensional structure of a lithium battery; Figure 2 is a cross-sectional schematic diagram of a lithium battery; Figure 3 for Figure 2 A partial enlarged view. The lithium battery of the present application includes a housing 101, a winding core 102, a circuit board 103, a protective cover 104 and a positive electrode body 105. The winding core 102 and the electrolyte are both arranged in the housing 101, and the circuit board 103 and the protective cover 104 are also arranged in the housing 101. The protective cover 104 is connected to the circuit board 103 and the winding core 102. The circuit board 103 is protected by the protective cover 104 to prevent the electrolyte from penetrating and contacting the electronic components on the circuit board 103, and the circuit board 103 is connected to the winding core 102 through the protective cover 104. The positive electrode body 105 is located outside the housing 101, and the positive electrode body 105 is connected to the circuit board 103. The positive electrode body 105 is exposed as the positive electrode of the entire lithium battery.

[0034] The shell 101 has a receiving groove 1011, which is opened along the axial direction of the shell 101. The core 102, the circuit board 103 and the protective cover 104 are all located in the receiving groove 1011, and the electrolyte injected later is also located in the receiving groove 1011. Furthermore, a groove 1012 is opened inward on the outer surface of the shell 101. Due to the setting of the groove 1012, the inner wall corresponding to the receiving groove 1011 forms an inner convex structure, which can not only fix the core 102, but also serve as a bearing point for the circuit board 103 and the protective cover 104, that is, the inner convex structure is divided into an upper side and a lower side along the axial direction, the lower side is close to the core 102, and the protective cover 104 is located on the upper side.

[0035] In specific applications, the circuit board 103 has a component side 1031 and a polarity side 1032, and the component side 1031 and the polarity side 1032 are opposite sides. In this embodiment, the side of the circuit board 103 facing the winding core 102 is the component side 1031, and the side of the circuit board 103 away from the winding core 102 is the polarity side 1032. Specifically, the electronic components are integrated on the component side 1031, and the protective cover 104 is arranged on the component side 1031, and the protective cover 104 is arranged on the electronic components to protect the electronic components; in addition, the components of the circuit board 103 Side 1031 is also integrated with a protection circuit. Compared with the traditional method of connecting the protection circuit to the lithium battery after independent processing, this embodiment can simplify the process and improve efficiency. When used specifically, the circuit board 103 can adjust the output voltage, for example, output a voltage value of 1.5V, 3.7V or 7.4V. Of course, the circuit supporting the circuit board 103 in this embodiment is a prior art, and only needs to be increased or decreased according to demand. Similarly, the electronic components are also prior art. Therefore, the specific electronic component distribution and circuit composition of the circuit board 103 are not elaborated. The positive electrode body 105 is arranged on the polarity side 1032 as the positive output end of the lithium battery. Furthermore, the polarity side 1032 is also provided with a negative electrode body 1033, and the shell 101 is connected to the negative electrode body 1033. Specifically, the negative electrode body 1033 is arranged along the contour of the polarity side 1032, and the notch of the receiving groove 1011 on the shell 101 contacts the negative electrode body 1033 through inward folding.

[0036] It can be understood that the positive terminal of the winding core 102 is the positive electrode ear, which is conductively connected to the positive electrode body 105 through the protective cover 104 and the circuit board 103. At this time, the positive electrode body 105 can be used as the positive output terminal of the lithium battery; the negative terminal of the winding core 102 is the negative electrode ear, which is conductively connected to the circuit board 103 through the shell 101 and the negative electrode body 1033. That is to say, the shell 101 will serve as the negative electrode output terminal of the lithium battery, so that the positive and negative electrodes of the lithium battery form a complete circuit.

[0037] Preferably, the lithium battery further comprises a first sealing body 106, which is arranged between the protective cover 104 and the inner wall surface of the receiving groove 1011; in specific application, the first sealing body 106 is located on the upper side of the groove 1012 of the housing 101, that is, the first sealing body 106 is supported by the upper side of the groove 1012; the protective cover 104 is arranged on the first sealing body 106, and is supported by the first sealing body 106. Through the arrangement of the first sealing body 106, not only the lithium battery is sealed to prevent the electrolyte in the receiving groove 1011 from flowing out, but also the contact between the protective cover 104 and the circuit board 103 and the housing 101 is blocked, so as to achieve an insulating effect. Specifically, the first sealing body 106 is made of a soft insulating material, such as plastic or silicone.

[0038] Furthermore, the lithium battery also includes a protective body 107, which is disposed between the protective cover 104 and the circuit board 103, and is conductively connected to the protective cover 104 and the circuit board 103. Specifically, the protective body 107 is a PTC thermistor, and the lithium battery is protected by the provision of the protective body 107. For example, when the temperature is too high, the resistance of the protective body 107 increases, thereby blocking the conduction between the protective cover 104 and the circuit board 103, that is, blocking the output of the positive terminal of the winding core 102; when the temperature drops, the resistance of the protective body 107 decreases, and the positive terminal of the winding core 102, the protective cover 104, the circuit board 103 and the positive body 105 can remain in a conductive state.

[0039] Furthermore, the lithium battery further includes an explosion-proof body 108, which is connected to the positive terminal of the winding core 102. At the same time, the protective cover 104 is provided with an exhaust hole 1041, and the internal space of the receiving groove 1011 and the internal space of the protective cover 104 can be communicated through the exhaust hole 1041. The side of the explosion-proof body 108 away from the positive terminal of the winding core 102 is connected to the wall surface of the exhaust hole 1041. It can be understood that due to the connection between the explosion-proof body 108 and the exhaust hole 1041, at this time, the exhaust hole 1041 is blocked, and the electrolyte in the receiving groove 1011 will not flow into the protective cover 104 through the exhaust hole 1041, and the circuit board 103 will not be damaged. Specifically, the explosion-proof body 108 is a CID explosion-proof valve. When there is excessive gas in the receiving groove 1011, the gas pressure generated will force the explosion-proof body 108 to detach from the exhaust hole 1041. At this time, the internal space of the receiving groove 1011 is connected to the internal space of the protective cover 104. The gas can be discharged to the outside of the lithium battery through the exhaust hole 1041 and the holes on the circuit board 103 to achieve pressure relief, thereby preventing the lithium battery from exploding due to excessive pressure inside, thereby improving the safety performance of the lithium battery.

[0040] Furthermore, the lithium battery further includes a second sealing body 109, which is disposed between the explosion-proof body 108 and the protective cover 104, and one side of the explosion-proof body 108 passes through the second sealing body 109 and is located in the exhaust hole 1041. The second sealing body 109 is disposed to not only enhance the connection stability between the explosion-proof body 108 and the protective cover 104, but also to seal the exhaust hole 1041 to prevent the electrolyte from flowing into the exhaust hole 1041. It is understandable that when the air pressure in the receiving tank 1011 exceeds a specified value, the explosion-proof body 108 not only detaches from the exhaust hole 1041, but also partially or completely detaches from the second sealing body 109, and the gas is discharged through the gap formed by the detachment of the explosion-proof body 108.

[0041] It should also be noted that the “conductive connection” referred to above is a connection mode in which electric current can be conducted, such as a connection between metals, which can conduct electric current.

[0042] To summarize, the electronic components are concentrated on the component side 1031 of the circuit board 103, and the component side 1031 faces the core 102. The protective cover 104 protects the component side 1031 to prevent the electrolyte from seeping in and damaging the electronic components. The positive end of the core 102 is connected to the circuit board 103 through the protective cover 104, and then the positive electrode body 105 is used as the positive electrode. The shell 101 is connected to the negative end of the core 102 as the negative electrode; the component side 1031 of the circuit board 103 is set inward, which can make full use of the space in the accommodating groove 1011, solve the problem of large volume caused by traditional electronic components facing outward, and reduce the volume of lithium batteries, which is conducive to meeting the needs of current products.

[0043] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the claims of the present invention.

Claims

1. A lithium battery, characterized in that: include: A shell (101), a winding core (102), a circuit board (103), a protective cover (104), and a positive electrode body (105); the circuit board (103) has a component side (1031) and a polarity side (1032) that are arranged opposite to each other; the shell (101) has a receiving groove (1011); the winding core (102) is arranged in the receiving groove (1011); the circuit board (103) is arranged in a notch of the receiving groove (1011), and the component side (1031) faces the winding core (102); the protective cover (104) is arranged on the component side (1031); and the positive electrode body (105) is arranged on the polarity side (1032); The negative terminal of the winding core (102) is conductively connected to the polarity side (1032) through the shell (101), and the positive terminal of the winding core (102) is conductively connected to the positive electrode body (105) through the protective cover (104).

2. The lithium battery according to claim 1, characterized in that: The polarity side (1032) is provided with a negative electrode body (1033), and the shell (101) is conductively connected to the negative electrode body (1033).

3. The lithium battery according to claim 1, characterized in that It also includes a first sealing body (106), which is arranged between the protection cover (104) and the wall surface of the containing groove (1011).

4. The lithium battery according to claim 3, characterized in that: The first sealing body (106) is made of plastic or silicone.

5. The lithium battery according to claim 1, characterized in that: It also includes a protection body (107), wherein the protection body (107) is arranged between the protection cover (104) and the element side (1031).

6. The lithium battery according to claim 1, characterized in that: It also includes an explosion-proof body (108), the protective cover (104) is provided with an exhaust hole (1041), and the explosion-proof body (108) is respectively connected to the wall surface of the exhaust hole (1041) and the positive terminal of the winding core (102).

7. The lithium battery according to claim 6, characterized in that: It also includes a second sealing body (109), wherein the second sealing body (109) is located between the explosion-proof body (108) and the protective cover (104), and one end of the explosion-proof body (108) passes through the second sealing body (109) and is connected to the wall of the exhaust hole (1041).

8. The lithium battery according to claim 5, characterized in that: The protection body (107) is a PTC thermistor.

9. The lithium battery according to claim 6, characterized in that: The explosion-proof body (108) is a CID explosion-proof valve.

10. The lithium battery according to any one of claims 1 to 9, characterized in that: The housing (101) is provided with a groove (1012) facing inwards.

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