Columnar Lithium-Ion Rechargeable Battery and Its Controller

Abstract

The present disclosure discloses a columnar lithium-ion rechargeable battery and its controller. The columnar lithium-ion rechargeable battery includes a lithium-ion battery cell and a controller. The controller includes a controller housing and a circuit board. The controller housing has an inner cavity, and an opening is provided at one axial end thereof. A plurality of pressure relief holes are formed in the side wall of the controller housing. The circuit board is received in the inner cavity, and an electrode cap is provided on the circuit board, and the electrode cap is exposed outside the controller housing through the opening.

Description

Technical Field

[0001] The present disclosure relates to the field of secondary batteries, and particularly to a columnar lithium-ion rechargeable battery and its controller. Background Art

[0002] Columnar batteries, such as No. 5 batteries, No. 7 batteries, etc., are widely used in daily life items such as toys, flashlights, alarm clocks, etc. Batteries are divided into nickel-cadmium batteries, nickel-metal hydride batteries, zinc-manganese batteries, and lithium-ion batteries, etc. In recent years, with the increasing demand for battery durability, lithium-ion batteries have attracted much attention due to their high energy storage capacity.

[0003] Since the chemical property of lithium is relatively active, when the battery core fails, gas expansion will occur, resulting in an increase in the internal pressure of the battery. When the pressure reaches a certain level, it may cause the battery core to rupture, resulting in leakage and causing safety accidents such as fire or explosion. Therefore, in order to ensure the safety of users during use, a pressure relief device is usually provided inside the battery core. The controller of the battery is generally arranged at the end of the battery core. Therefore, when the gas inside the battery core is released, it will directly blow away the controller. Although this method can effectively avoid serious safety accidents such as fire or explosion, the safety performance still needs to be further improved. Summary of the Invention

[0004] In order to solve the problem of low safety performance of lithium-ion batteries in related technologies, the present disclosure provides a columnar lithium-ion rechargeable battery and its controller with high safety performance.

[0005] The present disclosure provides a controller, including:

[0006] A controller housing having an inner cavity, with an opening provided at one axial end, and a plurality of pressure relief holes are provided on the side wall of the controller housing;

[0007] A circuit board is received in the inner cavity, and an electrode cap is provided on the circuit board, and the electrode cap is exposed outside the controller housing through the opening.

[0008] Optionally, the pressure relief holes are provided at the edge of the bottom of the side wall of the controller housing, and the plurality of pressure relief holes are spaced apart along the bottom perimeter of the controller housing.

[0009] Optionally, the pressure relief holes are rectangular notches or arc-shaped notches.

[0010] Optionally, the plurality of pressure relief holes are circular holes spaced apart along the circumferential direction of the controller housing.

[0011] Optionally, the controller housing includes:

[0012] The outer housing includes a cylindrical outer sidewall and a limiting baffle formed at one end of the outer sidewall and perpendicular to the axial direction of the outer sidewall. A through hole is formed in the center of the limiting baffle, and the electrode cap is exposed outside the housing through the through hole. The pressure relief hole is formed at the end of the outer sidewall away from the limiting baffle; and

[0013] The inner housing is received in the inner cavity. A supporting edge portion for supporting the circuit board is formed at one end of the inner housing. The outer housing and the inner housing are connected by soldering, and the circuit board and the supporting edge portion of the inner housing are connected by soldering.

[0014] Optionally, the bottom of the outer housing extends beyond the bottom of the inner housing to form a positioning cylindrical surface structure for positioning the lithium-ion cell housing.

[0015] Optionally, the circuit board includes a first surface and a second surface arranged opposite to each other. An outer housing pad is arranged on the first surface, and the outer housing pad is welded to the limiting baffle of the outer housing;

[0016] An inner housing pad is arranged on the second surface of the circuit board, and the inner housing pad is welded to the inner housing;

[0017] An electrode cap pad is arranged on the first surface of the circuit board, and the electrode cap pad is welded to the electrode cap;

[0018] The controller further includes an inner electrode. An inner electrode pad is arranged on the second surface, and the inner electrode pad is welded to the inner electrode.

[0019] The present disclosure further provides a cylindrical lithium-ion rechargeable battery, including:

[0020] A lithium-ion cell, which is provided with a positive electrode and a negative electrode, and the housing of the lithium-ion cell is the negative electrode;

[0021] The above-mentioned controller, the controller is installed at the positive end of the lithium-ion cell where the positive electrode is provided. The inner electrode of the controller is connected to the positive electrode of the lithium-ion cell, and the controller housing of the controller is connected to the housing of the lithium-ion cell.

[0022] Optionally, a plurality of cell pressure relief holes are formed at the positive end of the lithium-ion cell, and the cell pressure relief holes communicate with the pressure relief hole of the controller.

[0023] Optionally, the controller housing and the housing of the lithium-ion cell are connected by soldering.

[0024] The present disclosure further provides a cylindrical lithium-ion rechargeable battery, including:

[0025] A lithium-ion battery cell has a positive electrode and a negative electrode provided at both ends thereof, and the housing of the lithium-ion battery cell serves as the positive electrode;

[0026] The above-mentioned controller is installed at the negative end of the lithium-ion battery cell where the negative electrode is provided. The inner electrode of the controller is connected to the negative electrode of the lithium-ion battery cell, and the controller housing of the controller is connected to the housing of the lithium-ion battery cell.

[0027] Optionally, a plurality of battery cell pressure relief holes are provided at the negative end of the lithium-ion battery cell.

[0028] Optionally, the controller housing is connected to the housing of the lithium-ion battery cell by welding.

[0029] The technical solution provided by the embodiments of the present disclosure may include the following beneficial effects:

[0030] The present disclosure provides a controller, which includes a controller housing and a circuit board installed in the control housing. The controller housing has an inner cavity with an opening provided at one axial end. The circuit board is received in the inner cavity, and an electrode cap is provided on the circuit board and is exposed outside the controller housing through the opening. A plurality of pressure relief holes are provided on the side wall of the controller housing, and the plurality of pressure relief holes discharge the gas generated when the electrolyte of the battery cell fails, reducing the air pressure inside the controller housing and preventing fire or explosion.

[0031] The present disclosure further provides a cylindrical lithium-ion rechargeable battery, which includes a lithium-ion battery cell and the above-mentioned controller. The lithium-ion battery cell is provided with a positive electrode and a negative electrode, and the housing of the lithium-ion battery cell serves as the positive electrode. The controller is installed at the negative electrode end of the lithium-ion battery cell, the inner electrode of the controller is connected to the negative electrode of the lithium-ion battery cell, and the controller housing of the controller is connected to the housing of the lithium-ion battery cell. A plurality of pressure relief holes are provided on the controller housing of the cylindrical lithium-ion rechargeable battery, and the plurality of pressure relief holes discharge the gas generated when the electrolyte of the battery cell fails, reducing the air pressure inside the controller housing and preventing fire or explosion.

[0032] The present disclosure further provides a cylindrical lithium-ion rechargeable battery, which includes a lithium-ion battery cell and the above-mentioned controller. The lithium-ion battery cell is provided with a positive electrode and a negative electrode, and the housing of the lithium-ion battery cell serves as the negative electrode. The controller is installed at the positive electrode end of the lithium-ion battery cell, the inner electrode of the controller is connected to the positive electrode of the lithium-ion battery cell, and the controller housing of the controller is connected to the housing of the lithium-ion battery cell. A plurality of pressure relief holes are provided on the controller housing of the cylindrical lithium-ion rechargeable battery, and the plurality of pressure relief holes discharge the gas generated when the electrolyte of the battery cell fails, reducing the air pressure inside the controller housing and preventing fire or explosion.

[0033] It should be understood that the above general description and the following detailed description are exemplary only and do not limit the present disclosure. Brief Description of the Drawings

[0034] The drawings herein are incorporated into and constitute a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0035] Figure 1 is an exploded view of the controller of the present disclosure.

[0036] Figure 2 is a cross-sectional view of the assembled controller of the present disclosure.

[0037] Figure 3 is a bottom schematic view of the assembled controller of the present disclosure.

[0038] Figure 4 is an exploded view of the controller of the present disclosure with a negative electrode cap.

[0039] Figure 5 is a cross-sectional view of the controller of the present disclosure with a negative electrode cap.

[0040] Figure 6 is an exploded schematic view of the negative electrode cap and the circuit board.

[0041] Figure 7 is an exploded view of a cylindrical lithium-ion rechargeable battery.

[0042] Figure 8 is a schematic structural view of the assembled cylindrical lithium-ion rechargeable battery.

[0043] Figure 9 is a cross-sectional view of the assembled cylindrical lithium-ion rechargeable battery. Detailed Description of the Embodiments

[0044] To further illustrate the principles and structures of the present disclosure, the preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings.

[0045] The present disclosure provides a controller that is installed on a battery cell, for example, a lithium battery cell, to form a lithium-ion rechargeable battery with a controller, such as a No. 5 battery, a No. 7 battery, etc. The controller includes a controller housing and a circuit board installed in the control housing. The controller housing has an inner cavity, one axial end of which is provided with an opening, and a plurality of pressure relief holes are formed in the side wall of the controller housing. The plurality of pressure relief holes discharge the gas generated by the electrolyte of the battery cell when the battery cell fails, reducing the air pressure inside the controller housing and preventing fire or explosion. The circuit board is received in the inner cavity, and an electrode cap is provided on the circuit board. The electrode cap is exposed outside the controller housing through the opening.

[0046] The controller housing can be a single housing structure or a double housing structure. The following takes the double housing as an example to illustrate the solution of the present disclosure.

[0047] As Figures 1 to 3 shown, Figure 1 is an exploded view of the controller of the present disclosure, Figure 2 is a cross-sectional view of the assembled controller of the present disclosure, Figure 3 is a bottom view of the assembled controller of the present disclosure. The controller 10 includes a controller housing and a circuit board 13. The controller housing includes an outer housing 11 and an inner housing 12.

[0048] Specifically, the outer housing 11 is cylindrical and is made of a metal material. The outer housing 11 includes a cylindrical outer side wall 111 and a limiting baffle 112 that forms one axial end of the outer side wall and is perpendicular to the outer side wall. The limiting baffle 112 is arranged around the inner circumference of the outer side wall 111. The inner diameter of the limiting baffle 112 is smaller than the outer diameter of the circuit board 13. In this way, the circuit board 13 can be limited inside the outer housing 11 to prevent it from being exposed. At the other axial end of the outer housing 11 opposite to the limiting baffle 112, there is an opening. An inner cavity is formed inside the outer housing 11, and through holes are opened on the limiting baffle 112. The inner cavity communicates with the opening at the other end of the outer housing 11 and the through holes of the limiting baffle 112.

[0049] At the other end of the outer housing 11 relative to the limiting baffle 112, there are a plurality of pressure relief holes 113. More specifically, the plurality of pressure relief holes 113 are opened at the edge of the bottom of the outer side wall 111 of the outer housing 11, and the plurality of pressure relief holes 113 are spaced apart along the bottom perimeter of the outer side wall 111. These pressure relief holes 113 are used to discharge the gas generated by the lithium-ion battery cells to reduce the internal pressure of the battery.

[0050] Optionally, these pressure relief holes 113 are arranged at equal intervals along the perimeter of the outer housing 11.

[0051] Optionally, these pressure relief holes 113 can also be arranged at unequal intervals along the perimeter of the outer housing 11.

[0052] Optionally, the pressure relief holes 113 can be rectangular notches or arc-shaped notches.

[0053] Between two pressure relief holes 113, there is a protrusion 115 that is welded and connected to the outer shell of the battery cell, and the outer edge of the protrusion 115 contacts the outer shell of the battery cell.

[0054] Optionally, these pressure relief holes can be circular holes provided on the outer side wall 111 of the outer housing 11, that is, these circular holes are not provided on the bottom edge of the outer side wall 11 but above the bottom edge, and these circular holes are spaced apart along the circumferential direction surrounded by the outer side wall 111.

[0055] The circuit board 13 can be in a disc shape, having opposite first surface 131 and second surface 132. An electrode cap 15 is provided on the first surface 131. The electrode cap 15 is exposed outside the outer housing 11 through the through hole of the limit baffle 112. Circuit components are provided on the second surface 132, and the circuit components can include components for controlling charging and / or discharging.

[0056] A ring of outer housing pads 1311 is also provided at the edge of the first surface 131, and the outer housing pads 1311 are connected to the inner surface of the limit baffle 112 by reflow soldering. An inner housing pad 1321 is provided at the edge position of the second surface 132, and the inner housing pad 1321 is welded to the supporting edge portion 121 of the inner housing 12.

[0057] The inner housing 12 is made of a metal material and is received in the inner cavity of the outer housing 11. The inner housing 12 includes an annular inner side wall 122 and the above-mentioned supporting edge portion 121 connected to the inner side wall 122 for supporting the circuit board 13. The inner side wall 122 encloses a cylindrical shape. The supporting edge portion 121 bends and extends towards the central axis direction of the inner side wall 122 to form a supporting surface for supporting the circuit board 13.

[0058] The supporting edge portion 121 includes a plurality of welding feet 1221 formed at the top of the inner side wall 122 and circumferentially spaced along the inner side wall 122. Each welding foot 1221 bends and extends towards the central axis direction of the inner side wall 122 to form a supporting surface for supporting the circuit board 13. An arc chamfer is formed between each welding foot 1221 and the inner side wall 122, that is, an arc-shaped transition portion 123 is formed.

[0059] A first gap 181 for accumulating solder paste is formed between the transition portion 123 and the outer side wall 111 and the inner housing pad 1321 of the circuit board 13. A second gap 182 for accumulating solder paste is formed between the circuit board 13 and the outer side wall 111 of the outer housing 11, and the first gap 181 and the second gap 182 are connected. When welding the circuit board 13, the inner housing 12 and the outer housing 11, for example, when welding by reflow soldering, the solder paste coated on the outer housing pads 1311 and the inner housing pads 1321 of the circuit board 13 flows into the first gap 181 and the second gap 182 when heated, filling the first gap 181 and the second gap 182.

[0060] In addition, in order to facilitate the installation between the inner housing 12 and the outer housing 11, a gap is also reserved between the outer surface of the inner side wall of the inner housing 12 and the inner surface of the outer side wall of the outer housing 11, and a part of the solder paste on the outer housing pads 1311 and the inner housing pads 1321 also flows into this gap, filling this gap.

[0061] After the solder paste is heated and cured, the outer shell pad 1311 is connected to the limiting baffle 112 of the outer shell body 11, and the inner shell pad 1321 is connected to the support surface of the support edge portion 121 of the inner shell body 12. After the solder paste is cured, it jointly supports the circuit board with the support edge portion 121. Since the solder paste has good shear resistance, the support edge portion 121 can provide a firm support for the circuit board 13 after being bonded with the solder paste.

[0062] A groove 124 for accumulating solder paste is formed between the two welding feet 1221 of the support edge portion 121. When the solder paste is heated and cured, the solder paste on the outer shell pad 1311 and the inner shell pad 1321 will also be squeezed into the groove 124. In this way, the connection between the outer shell body 11, the circuit board 13, and the inner shell body 12 is further strengthened.

[0063] It should be noted here that solder wire or solder balls can also be used instead of solder paste, and the gaps or grooves are filled with the fluid solder formed after the melting of the solder wire or solder balls.

[0064] Optionally, the welding feet 1211 of the inner shell body 12 are arranged at equal intervals along the circular perimeter surrounded by the inner side wall 122.

[0065] Optionally, the welding feet 1211 of the inner shell body 12 can be arranged at unequal intervals.

[0066] The bottom of the outer shell body 11 extends beyond the bottom of the inner shell body 12 to form a housing positioning columnar surface structure 114 for positioning the lithium-ion battery cell.

[0067] The bottom edge of the inner shell body 12 is higher than the bottom surface of the pressure relief hole 113, so that the inner shell body 12 does not block the pressure relief hole 113.

[0068] In other embodiments, the inner shell body 12 can be omitted, and the circuit board 13 can be directly fixed in the inner cavity of the outer shell body 11 by soldering.

[0069] An electrode cap pad is also provided on the circuit board 13, and the electrode cap pad is welded to the electrode cap 15. The electrode cap 15 includes a hollow cylindrical cap body 151 and an annular cap brim 152 formed on the outer periphery of the cap body 151. The electrode cap 15 protrudes from the outer shell body 11. The electrode cap 15 can be a positive electrode cap or a negative electrode cap. For example, if the negative electrode of the battery cell corresponding to the installation of the double-shell controller 10 is connected to the outer shell body 11, then the electrode cap 15 is connected to the positive electrode of the battery cell, and the electrode cap 15 is a positive electrode cap; on the contrary, if the positive electrode of the battery cell corresponding to the installation of the double-shell controller 10 is connected to the outer shell body 11, then the electrode cap 15 is connected to the negative electrode of the battery cell, and the electrode cap 15 is a negative electrode cap.

[0070] For example, as Figures 1 to 3 , the electrode cap 15 can be a positive electrode cap.

[0071] For example, as Figures 4 to 6 shown, Figure 4 is an exploded view of a controller with a negative electrode cap according to the present disclosure, Figure 5 is a cross-sectional view of a controller with a negative electrode cap according to the present disclosure, Figure 6 is an exploded schematic diagram of a negative electrode cap and a circuit board. The controller 10b includes an outer housing 11b, an inner housing 12b, and a circuit board 13b. The electrode cap provided on the circuit board 13b is a negative electrode cap 15b. The main difference between this negative electrode cap 15b and Figures 1 to 3 the positive electrode cap is that the height of the positive electrode cap body is higher than that of the negative electrode cap, and the outer diameter of the brim of the positive electrode cap body is smaller than that of the negative electrode cap. The brim of the negative electrode cap 15b is welded to a plurality of pads 130b on the first surface 131b of the circuit board 13b. These pads 130b are arranged in a ring, and the outer diameter of the ring is adapted to the outer diameter of the brim of the negative electrode cap 15b, so that the brim of the negative electrode cap 15b fits with these pads 130b. The inner diameter of the ring is slightly larger than the inner diameter of the brim of the negative electrode cap 15b, so that when the circuit board 13b and the brim of the negative electrode cap 15b pass through a reflow soldering machine, the molten solder paste can extend upward along the inside of the brim of the negative electrode cap 15b, thereby increasing the welding strength of the brim of the negative electrode cap 15b. The Figure 4 and Figure 5 structures such as the outer housing, inner housing, and circuit board of the controller, as well as the positional relationship and connection relationship between them, can be the same as those in the above Figures 1 to 3 involved embodiments. Here, the repeated description of the same components and the same structures is omitted.

[0072] Please continue to refer to Figure 1 and Figure 2 , the double-shell controller 10 further includes an electrode cap insulating sheet 14. The electrode cap insulating sheet 14 is in a disc shape and has a through hole 141 in the middle. The cap body 151 is exposed outside the outer housing 11 through the through hole 141. The electrode cap insulating sheet 14 covers the limiting baffle 112 and the brim 152. The electrode cap insulating sheet 14 isolates the electrode cap 151 and the outer housing 11 to prevent the two from conducting.

[0073] On the second surface 132 of the circuit board 13, inner electrode pads for soldering the inner electrodes 16 are further provided. Inner electrode positioning holes 134 are further provided on the inner electrode pads. The positioning feet 163 of the inner electrodes 16 are inserted into the inner electrode positioning holes 134, ensuring the circumferential positioning of the inner electrodes 16 on the circuit board 13. The inner electrodes 16 include electrode strips 161 and inner electrode circuit board soldering platforms 164, and the inner electrode circuit board soldering platforms 164 and the electrode strips 161 form an L shape. The electrode contact platforms 164 abut against the inner electrode pads on the second surface of the circuit board 13, ensuring the axial positioning of the inner electrodes 16 on the circuit board 13. The inner electrode circuit board soldering platforms 164 increase the contact area between the inner electrodes 16 and the circuit board 13, facilitating the passage of a larger current. At the same time, when a current passes through the inner electrodes 16, the heat generation at the connection part between the inner electrodes 16 and the circuit board 13 can be reduced.

[0074] Bending positioning grooves 162 are further provided on the inner electrodes 16. On the one hand, the bending positioning grooves 162 can position the bending positions, and on the other hand, they can also reduce stress concentration, ensuring that the inner electrodes 16 are folded at the bending positioning grooves 162 and ensuring the consistency of the folding of the inner electrodes 16.

[0075] Resistance welding choke grooves 165 are provided at the movable ends 167 of the inner electrodes 16, increasing the current path when the inner electrodes 16 are resistance welded to the electrode bosses of the lithium-ion battery cells, thereby increasing the welding strength. The movable ends 167 of the inner electrodes 16 can be strip-shaped.

[0076] Optionally, when the battery volume is small, the movable ends 167 of the inner electrodes 16 can be designed into disc shapes to increase the contact area of the electrodes.

[0077] Glue injection holes and exhaust overflow holes are provided on the circuit board 13. In a vacuum environment, pre-prepared thermal conductive glue is injected into the cavity of the outer housing 11 through the glue injection holes of the circuit board 13. After the thermal conductive glue fills the inner cavity formed by the first surface 131 of the circuit board 13 and the electrode caps 15, it overflows from the exhaust overflow holes of the circuit board 13 into the cavity formed by the second surface 132 of the circuit board 13 and the outer housing 11 until the thermal conductive glue covers the components on the entire second surface of the circuit board 13 and forms a layer of thermal conductive glue layer. The movable ends and most of the electrode strips of the inner electrodes 16 are exposed to the thermal conductive glue layer.

[0078] An inner electrode insulating sheet 17 is covered on the thermal conductive glue layer. The inner electrode insulating sheet 17 has a notch. One end of the inner electrode 16 is soldered on the second surface 132 of the circuit board 13, and the other end passes through the notch and is placed on the inner electrode insulating sheet 17, so that the other end of the inner electrode 16 is isolated and insulated from the components on the circuit board 13. The inner electrode 16 is bent for the first time at the notch of the inner electrode insulating sheet 17 and bent for the second time at the bending positioning grooves 162.

[0079] The present disclosure also provides a cylindrical lithium-ion rechargeable battery, which can be a No. 5 lithium-ion battery or a No. 7 lithium-ion battery. As Figures 7 to 9 shown, Figure 7 is an exploded view of the cylindrical lithium-ion rechargeable battery. Figure 8 is a schematic structural view of the cylindrical lithium-ion rechargeable battery after assembly. Figure 9 is a cross-sectional view of the cylindrical lithium-ion rechargeable battery after assembly. The cylindrical lithium-ion rechargeable battery 100 includes a lithium-ion battery cell 20 and the Figures 1 to 3 controller 10 according to any one of the above embodiments.

[0080] The interior of the lithium-ion battery cell 20 is filled with electrolyte. The lithium-ion battery cell 20 is provided with a negative electrode and a positive electrode, and the housing 24 of the lithium-ion battery cell serves as the negative electrode. One end of the lithium-ion battery cell 20 where the positive electrode is provided is the positive electrode end, and a positive electrode boss 21 is provided at the positive electrode end. A cell pressure relief hole 22 is provided on the side wall of the positive electrode boss 21, and the gas generated by the lithium-ion battery cell is discharged through the cell pressure relief hole 22.

[0081] The double-shell controller 10 is disposed at the positive electrode end of the lithium-ion battery cell 20, and its outer housing 11 is welded to the housing 24 of the lithium-ion battery cell. More specifically, the outer edge of the protrusion 115 of the outer housing 11 is welded to the housing 24. The pressure relief hole 113 of the outer housing 11 is communicated with the cell pressure relief hole 22, so that the gas discharged from the cell pressure relief hole 22 enters the outer housing 11 and is discharged through the pressure relief hole 113 of the outer housing 11, thereby reducing the air pressure inside the lithium-ion battery cell 20.

[0082] The movable end 167 of the inner electrode 16 of the double-shell controller 10 is welded to the positive electrode boss 21.

[0083] A cell insulating sheet 23 is disposed on the outer periphery of the positive electrode boss 21 of the lithium-ion battery cell 20. The cell insulating sheet 23 is annular and is used to isolate the inner electrode of the double-shell controller 10 from contacting other structural members (such as the housing 24) to avoid short circuit.

[0084] As Figure 8 shown, the bottom of the outer housing 11 of the controller 10 extends beyond the bottom of the inner housing 12. The extended part of the outer housing 11 forms a positioning cylindrical surface structure 114, and the positioning cylindrical surface structure 114 encloses a positioning groove. The top end of the lithium-ion battery cell 20 is inserted into the positioning groove, and the positioning cylindrical surface structure 114 abuts against the rounded corner of the housing 24 of the lithium-ion battery cell on the outer periphery and forms a weld seam at the joint between the two for welding.

[0085] In one embodiment, the present disclosure further provides a cylindrical lithium-ion rechargeable battery. Specifically, the cylindrical lithium-ion rechargeable battery includes a lithium-ion battery cell and the above Figures 4 to 5The controller 10 described in any of the embodiments. The lithium-ion battery cell is filled with electrolyte inside, and the lithium-ion battery cell has a positive electrode and a negative electrode. The housing of the lithium-ion battery cell serves as the positive electrode. The lithium-ion battery cell is provided with a negative electrode as the negative extreme end, and the negative extreme end is provided with a negative electrode boss, which is electrically connected to the negative electrode.

[0086] The controller 10 is arranged at the negative extreme end of the lithium-ion battery cell, and the inner electrode of the controller 10 is electrically connected to the negative electrode boss of the lithium-ion battery cell. The controller housing of the controller 10 is connected to the housing of the lithium-ion battery cell, so that the controller housing is electrically connected to the positive electrode of the lithium-ion battery cell.

[0087] The negative extreme end of the lithium-ion battery cell is provided with a plurality of battery cell pressure relief holes.

[0088] In addition, in the above embodiments, the controller housing includes an outer housing and an inner housing. In one embodiment, the controller housing may also only include the outer housing. In this case, the circuit board can be fixed by the welding connection between the limit baffle of the outer housing and the outer housing pad of the circuit board.

[0089] The above is only a preferred and feasible embodiment of the present disclosure, and does not limit the protection scope of the present disclosure. Any equivalent structural changes made by using the content of the specification and drawings of the present disclosure are included in the protection scope of the present disclosure.

Claims

1. A controller, characterized in that, it includes: A controller housing having an inner cavity with an opening at one axial end, and a plurality of pressure relief holes are provided on the side wall of the controller housing; A circuit board is housed in the inner cavity. An electrode cap is provided on the circuit board, and the electrode cap is exposed outside the controller housing through the opening; The controller housing includes an outer housing and an inner housing. The outer housing includes a cylindrical outer side wall and a limiting baffle formed at one end of the outer side wall and perpendicular to the axial direction of the outer side wall. A through hole is provided at the center of the limiting baffle, and the electrode cap is exposed outside the outer housing through the through hole. The pressure relief holes are provided at one end of the outer side wall away from the limiting baffle; The inner housing is housed in the inner cavity. A supporting edge portion for supporting the circuit board is formed at one end of the inner housing. The outer housing and the inner housing are connected by soldering, and the circuit board and the supporting edge portion of the inner housing are connected by soldering.

2. The controller according to claim 1, characterized in that, The pressure relief holes are provided at the edge of the bottom of the side wall of the controller housing, and a plurality of the pressure relief holes are spaced along the bottom perimeter of the controller housing.

3. The controller according to claim 2, characterized in that, The pressure relief holes are rectangular notches or arc-shaped notches.

4. The controller according to claim 1, characterized in that, A plurality of the pressure relief holes are circular holes spaced along the circumferential direction of the controller housing.

5. The controller according to claim 1, characterized in that, The bottom of the outer housing extends beyond the bottom of the inner housing to form a positioning cylindrical surface structure for positioning the housing of the lithium-ion battery cell.

6. The controller according to claim 1, characterized in that, The circuit board includes a first surface and a second surface arranged opposite to each other. An outer shell pad is provided on the first surface, and the outer shell pad is welded to the limiting baffle of the outer shell; An inner shell pad is provided on the second surface of the circuit board, and the inner shell pad is welded to the inner shell; An electrode cap pad is provided on the first surface of the circuit board, and the electrode cap pad is welded to the electrode cap; The controller further includes an inner electrode. An inner electrode pad is provided on the second surface, and the inner electrode pad is welded to the inner electrode.

7. A cylindrical lithium-ion rechargeable battery, characterized in that, it includes: A lithium-ion battery cell provided with a positive electrode and a negative electrode, and the housing of the lithium-ion battery cell is the negative electrode; The controller according to claims 1 to 6, the controller is installed at the positive electrode end of the lithium-ion battery cell, the inner electrode of the controller is connected to the positive electrode of the lithium-ion battery cell, and the controller housing of the controller is connected to the housing of the lithium-ion battery cell; The controller housing includes an outer housing and an inner housing. The outer housing includes a cylindrical outer sidewall and a limiting baffle formed at one end of the outer sidewall and perpendicular to the axial direction of the outer sidewall. A through hole is formed in the center of the limiting baffle, and the electrode cap is exposed outside the outer housing through the through hole. The pressure relief hole is formed at one end of the outer sidewall away from the limiting baffle. The inner housing is received in the inner cavity. A supporting edge portion for supporting the circuit board is formed at one end of the inner housing. The outer housing and the inner housing are connected by soldering, and the circuit board and the supporting edge portion of the inner housing are connected by soldering.

8. The cylindrical lithium-ion rechargeable battery according to claim 7, wherein, a plurality of cell pressure relief holes are provided at the positive electrode end of the lithium-ion cell, and the cell pressure relief holes communicate with the pressure relief hole of the controller.

9. The cylindrical lithium-ion rechargeable battery according to claim 8, wherein, the controller housing and the housing of the lithium-ion cell are connected by welding.

10. A cylindrical lithium-ion rechargeable battery, wherein, comprising: a lithium-ion cell provided with a positive electrode and a negative electrode, and the housing of the lithium-ion cell is the positive electrode; a controller as described in claims 1 to 6, the controller is installed at the negative electrode end of the lithium-ion cell, the inner electrode of the controller is connected to the negative electrode of the lithium-ion cell, and the controller housing of the controller is connected to the housing of the lithium-ion cell; The controller housing includes an outer housing and an inner housing. The outer housing includes a cylindrical outer sidewall and a limiting baffle formed at one end of the outer sidewall and perpendicular to the axial direction of the outer sidewall. A through hole is formed in the center of the limiting baffle, and the electrode cap is exposed outside the outer housing through the through hole. The pressure relief hole is formed at one end of the outer sidewall away from the limiting baffle. The inner housing is received in the inner cavity. A supporting edge portion for supporting the circuit board is formed at one end of the inner housing. The outer housing and the inner housing are connected by soldering, and the circuit board and the supporting edge portion of the inner housing are connected by soldering.

11. The cylindrical lithium-ion rechargeable battery according to claim 10, wherein, a plurality of cell pressure relief holes are provided at the negative electrode end of the lithium-ion cell.

12. The cylindrical lithium-ion rechargeable battery according to claim 11, wherein, the controller housing and the housing of the lithium-ion cell are connected by welding.

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