Lithium battery

Abstract

A lithium battery, comprises: a casing (101), a jelly roll (102), a circuit board (103), a protective cover (104) and a positive electrode body (105), wherein the circuit board (103) has a component side (1031) and a polarity side (1032) that are arranged opposite each other; the casing (101) has an accommodating cavity (1011); the jelly roll (102) is disposed in the accommodating cavity (1011); the circuit board (103) is disposed at an opening of the accommodating cavity (1011), with the component side (1031) facing the jelly roll (102); the protective cover (104) is disposed on the component side (1031); and the positive electrode body (105) is disposed on the polarity side (1032). Electronic components are concentrated on the component side (1031) of the circuit board (103), the component side (1031) faces the jelly roll (102), and the protective cover (104) protects the component side (1031) and prevents electrolyte infiltration and damage to the electronic components; a positive terminal of the jelly roll (102) is connected to the circuit board (103) by means of the protective cover (104), and is then led out by the positive electrode body (105), which functions as a positive electrode, and the casing (101) is connected to a negative terminal of the jelly roll (102) to serve as a negative electrode; and the component side (1031) of the circuit board (103) is arranged facing inward, so that the space inside the accommodating cavity (1011) can be fully utilized, thereby solving the problem of the volume being large due to conventional electronic components facing outward, and reducing the volume of the lithium battery so as to meet the requirements of current products.

Description

lithium batteries Technical Field

[0001] This application relates to the field of energy storage product technology, and more specifically, to a lithium battery. Background Technology

[0002] Lithium batteries are used in many fields due to their numerous advantages. For normal use and protection during charging and discharging, lithium batteries need to be connected to an external circuit protection board for regular use. This board monitors parameters such as voltage, current, and temperature to provide charging and discharging protection, preventing battery failures such as overcharging, over-discharging, and short circuits.

[0003] Currently, the combination of common lithium batteries and circuit protection boards results in an increase in size. As many products are now pursuing further miniaturization, excessively large lithium batteries can no longer meet the needs of current products, and their application scenarios are gradually being limited.

[0004] Application content

[0005] In view of the shortcomings of the prior art, this application provides a lithium battery.

[0006] The present application discloses a lithium battery comprising: a casing, a winding core, a circuit board, a protective cover, and a positive electrode. The circuit board has an element side and a polarity side disposed opposite to each other. The casing has a receiving groove. The winding core is disposed in the receiving groove. The circuit board is disposed at the opening of the receiving groove with the element side facing the winding core. The protective cover is disposed on the element side, and the positive electrode is disposed on the polarity side.

[0007] The negative terminal of the core is electrically connected to the polarity side through the shell, and the positive terminal of the core is electrically connected to the positive electrode through the protective cover.

[0008] According to one embodiment of this application, a negative electrode is provided on the polarity side, and the housing is electrically connected to the negative electrode.

[0009] According to one embodiment of this application, it further includes a first sealing body disposed between the protective cover and the wall of the receiving groove.

[0010] According to one embodiment of this application, the first sealing body is made of plastic or silicone.

[0011] According to one embodiment of this application, a protective body is also included, which is disposed between the protective cover and the component side.

[0012] According to one embodiment of this application, it also includes an explosion-proof body, the protective cover having an exhaust hole, and the explosion-proof body being connected to the wall surface of the exhaust hole and the positive end of the core respectively.

[0013] According to one embodiment of this application, it further includes a second sealing body, which is located between the explosion-proof body and the protective cover, with one end of the explosion-proof body penetrating through the second sealing body and connected to the wall of the vent hole.

[0014] According to one embodiment of this application, the protective body is a PTC thermistor.

[0015] According to one embodiment of this application, the explosion-proof body is a CID explosion-proof valve.

[0016] According to one embodiment of this application, the housing has an inwardly facing groove.

[0017] The beneficial effects of this application are that the electronic components are concentrated on the component side of the circuit board, with the component side facing the core. The protective cover protects the component side and prevents electrolyte from seeping in and damaging the electronic components. The positive terminal of the core is connected to the circuit board through the protective cover and then led out by the positive electrode. The shell is connected to the negative terminal of the core as the negative electrode. By setting the component side of the circuit board to face inward, the space in the receiving slot can be fully utilized, solving the problem of large size caused by traditional outward-facing electronic components. Reducing the size of the lithium battery is conducive to meeting the needs of current products. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 is a schematic diagram of the three-dimensional structure of a lithium battery;

[0020] Figure 2 is a cross-sectional schematic diagram of a lithium battery;

[0021] Figure 3 is a magnified view of a portion of Figure 2.

[0022] Explanation of reference numerals in the attached figures

[0023] 101. Shell; 1011. Receiving groove; 1012. Groove;

[0024] 102. Roll core;

[0025] 103. Circuit board; 1031. Component side; 1032. Polarity side; 1033. Negative electrode;

[0026] 104. Protective cover; 1041. Vent hole;

[0027] 105. Positive electrode;

[0028] 106. First sealing body;

[0029] 107. Protective body;

[0030] 108. Explosion-proof body;

[0031] 109. Second sealing body. Detailed Implementation

[0032] The following drawings disclose several embodiments of this application. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this application. That is, in some embodiments of this application, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0033] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit this application. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0034] As shown in Figures 1-3, Figure 1 is a three-dimensional structural diagram of a lithium battery; Figure 2 is a cross-sectional diagram of a lithium battery; and Figure 3 is a partial enlarged view of Figure 2. The lithium battery of this application includes a casing 101, a winding core 102, a circuit board 103, a protective cover 104, and a positive electrode 105. The winding core 102 and the electrolyte are both disposed within the casing 101. The circuit board 103 and the protective cover 104 are also disposed within the casing 101. The protective cover 104 is connected to the circuit board 103 and the winding core 102, protecting the circuit board 103 from electrolyte seepage and contact with the electronic components on the circuit board 103. The protective cover 104 also connects the circuit board 103 to the winding core 102. The positive electrode 105 is located outside the casing 101 and is connected to the circuit board 103, with the positive electrode 105 exposed as the positive electrode of the entire lithium battery.

[0035] The housing 101 has a receiving groove 1011, which is opened along the axial direction of the housing 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 housing 101. Due to the setting of the groove 1012, the inner wall of the receiving groove 1011 forms an inward convex structure. This inward convex structure can not only fix the core 102, but also serve as a support point for the circuit board 103 and the protective cover 104. That is, the inward 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.

[0036] In practical applications, the circuit board 103 has a component side 1031 and a polarity side 1032, which 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, electronic components are integrated on the component side 1031, and a protective cover 104 is disposed on the component side 1031, covering the electronic components to protect them. In addition, the components of the circuit board 103... Side 1031 also integrates a protection circuit. Compared to the traditional method of processing the protection circuit independently and connecting it to the lithium battery, this embodiment simplifies the process and improves efficiency. In specific use, the circuit board 103 can adjust the output voltage, for example, outputting 1.5V, 3.7V, or 7.4V. Of course, the circuit associated with the circuit board 103 in this embodiment is existing technology, and can be added or removed according to requirements. Similarly, the electronic components are also existing technology. Therefore, the specific distribution of electronic components and circuit composition of the circuit board 103 will not be elaborated. The positive electrode 105 is disposed on the polarity side 1032 as the positive output terminal of the lithium battery. Furthermore, the polarity side 1032 is also provided with a negative electrode 1033. The housing 101 is connected to the negative electrode 1033. Specifically, the negative electrode 1033 is disposed along the contour of the polarity side 1032, and the slot of the receiving groove 1011 on the housing 101 contacts the negative electrode 1033 through inward folding.

[0037] Understandably, the positive end of the core 102 is the positive tab, which is electrically connected to the positive electrode 105 through the protective cover 104 and the circuit board 103. At this time, the positive electrode 105 can serve as the positive output terminal of the lithium battery. The negative end of the core 102 is the negative tab, which is electrically connected to the circuit board 103 through the housing 101 and the negative electrode 1033. In other words, the housing 101 will serve as the negative output terminal of the lithium battery, so that the positive and negative terminals of the lithium battery form a complete circuit.

[0038] Preferably, the lithium battery further includes a first sealing body 106, which is disposed between the protective cover 104 and the inner wall of the receiving groove 1011. In specific applications, 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 disposed on the first sealing body 106 and supported by the first sealing body 106. The first sealing body 106 not only seals the lithium battery to prevent the electrolyte in the receiving groove 1011 from flowing out, but also blocks the contact between the protective cover 104 and the circuit board 103 and the housing 101, thus providing an insulating effect. Specifically, the first sealing body 106 is made of a soft insulating material, such as plastic or silicone.

[0039] Furthermore, the lithium battery also includes a protective body 107, which is disposed between the protective cover 104 and the circuit board 103. The protective body 107 is electrically connected to the protective cover 104 and to the circuit board 103. Specifically, the protective body 107 is a PTC thermistor. The protective body 107 protects the lithium battery. 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 decreases, 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 electrode 105 can remain in a conductive state.

[0040] Furthermore, the lithium battery also includes an explosion-proof body 108, which is connected to the positive terminal of the winding core 102. Simultaneously, the protective cover 104 has a vent 1041, and the internal space of the receiving groove 1011 and the internal space of the protective cover 104 can communicate through the vent 1041. The side of the explosion-proof body 108 away from the positive terminal of the winding core 102 is connected to the wall of the vent 1041. Understandably, due to the connection between the explosion-proof body 108 and the vent 1041, the vent 1041 is blocked, preventing the electrolyte in the receiving groove 1011 from flowing into the protective cover 104 through the vent 1041, and thus preventing damage to the circuit board 103. Specifically, the explosion-proof body 108 is a CID explosion-proof valve. When there is excessive gas in the receiving tank 1011, the resulting gas pressure will force the explosion-proof body 108 to detach from the exhaust port 1041. At this time, the internal space of the receiving tank 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 port 1041 and the hole on the circuit board 103 to achieve pressure relief. This prevents the lithium battery from exploding due to excessive pressure and improves the safety performance of the lithium battery.

[0041] Furthermore, the lithium battery also includes a second sealing body 109, which is disposed between the explosion-proof body 108 and the protective cover 104. One side of the explosion-proof body 108 penetrates the second sealing body 109 and is located within the vent hole 1041. The second sealing body 109 not only enhances the connection stability between the explosion-proof body 108 and the protective cover 104, but also seals the vent hole 1041, preventing electrolyte from flowing into it. It is understood that when the gas pressure in the receiving tank 1011 exceeds a certain value, the explosion-proof body 108 will not only detach from the vent hole 1041, but will also partially or completely detach from the second sealing body 109, and the gas will be discharged through the gap formed by the detachment of the explosion-proof body 108.

[0042] It should also be noted that the "conductive connection" mentioned above refers to a connection method in which current can be conducted, such as the connection between metals, which allows current to be conducted.

[0043] In summary, the electronic components are concentrated on the component side 1031 of the circuit board 103, facing the core 102. The protective cover 104 protects the component side 1031 to prevent electrolyte from seeping in and damaging the electronic components. The positive terminal of the core 102 is connected to the circuit board 103 through the protective cover 104, and then led out by the positive electrode 105. The housing 101 is connected to the negative terminal of the core 102 as the negative electrode. By setting the component side 1031 of the circuit board 103 inward, the space in the receiving slot 1011 can be fully utilized, solving the problem of large size caused by traditional outward-facing electronic components. Reducing the size of the lithium battery is beneficial to meeting the needs of current products.

[0044] The above description is merely an embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A lithium battery, characterized in that, include: The device comprises a housing (101), a winding core (102), a circuit board (103), a protective cover (104), and a positive electrode (105). The circuit board (103) has a component side (1031) and a polarity side (1032) disposed opposite to each other. The housing (101) has a receiving groove (1011). The winding core (102) is disposed in the receiving groove (1011). The circuit board (103) is disposed at the opening of the receiving groove (1011), and the component side (1031) faces the winding core (102). The protective cover (104) is disposed on the component side (1031), and the positive electrode (105) is disposed on the polarity side (1032). The negative terminal of the core (102) is electrically connected to the polar side (1032) through the housing (101), and the positive terminal of the core (102) is electrically connected to the positive electrode (105) through the protective cover (104).

2. The lithium battery according to claim 1, characterized in that, The polar side (1032) is provided with a negative electrode (1033), and the housing (101) is electrically connected to the negative electrode (1033).

3. The lithium battery according to claim 1, characterized in that, It also includes a first sealing body (106), which is disposed between the protective cover (104) and the wall of the receiving 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 protective body (107) disposed between the protective cover (104) and the component 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) has an exhaust port (1041), and the explosion-proof body (108) is connected to the wall of the exhaust port (1041) and the positive end of the core (102).

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

8. The lithium battery according to claim 5, characterized in that, The protective 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 1-9, characterized in that, The housing (101) has an inwardly facing groove (1012).

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