Cylindrical battery and its controller

Abstract

The present disclosure discloses a cylindrical battery and a controller thereof, wherein the cylindrical battery comprises a lithium-ion battery cell and a controller. The controller comprises an outer shell and a circuit board. The outer shell is made of metal, and comprises a cylindrical outer wall and a limit baffle formed at one axial end of the outer wall. An opening is arranged at the other end of the outer shell opposite to the limit baffle, and a cavity is formed inside the outer shell. A through hole is arranged on the limit baffle, and the cavity is connected with the opening and the through hole. The circuit board has a first surface and a second surface opposite to each other, an electrode cap is arranged on the first surface, and circuit components are arranged on the second surface. The circuit board is located in the cavity, and the electrode cap is exposed to the outer shell through the through hole. The circuit board is connected to the inner surface of the limit baffle.

Description

Technical Field

[0001] The present disclosure relates to the field of secondary batteries, and in particular to a cylindrical battery and a controller thereof. Background Art

[0002] Cylindrical batteries, such as No. 5 and No. 7 batteries, are widely used in toys, flashlights, alarm clocks and other items in daily life. There are many types of batteries, such as nickel-cadmium batteries, nickel-metal hydride batteries, zinc-manganese batteries and lithium-ion batteries. In recent years, lithium-ion batteries have attracted much attention due to their high energy storage capacity. For energy-saving and environmental protection considerations, most lithium-ion batteries are currently designed to be rechargeable and recyclable.

[0003] Lithium-ion batteries usually include an electrode cap, a shell, a battery cell and a controller disposed in the shell. The shell is connected to the positive electrode or negative electrode of the battery cell (if it is connected to the positive electrode of the battery cell, the electrode cap is a negative electrode cap, on the contrary, if it is connected to the negative electrode of the battery cell, the electrode cap is a positive electrode cap). The shell is concave inward near the top to form an arched boss to support the controller. The electrode cap is installed above the controller, and the shell and the electrode cap are isolated by an insulating pad. Since the arched boss formed by the inward concave shell needs to occupy a certain space, the height is increased. In order to ensure that the height of the battery is consistent with the standard, the height of the battery cell can only be sacrificed, and the reduction of the height of the battery cell will inevitably affect the capacity of the battery. Summary of the invention

[0004] In order to solve the problem in the related art that the outer shell of a cylindrical battery affects the battery capacity due to the provision of an arched boss supporting a controller, the present disclosure provides a cylindrical battery and a controller thereof that can save the installation space of a control circuit board.

[0005] The present disclosure provides a controller for a cylindrical battery, comprising:

[0006] The outer shell is made of metal and includes a cylindrical outer wall and a limit baffle formed at one axial end of the outer wall. An opening is provided at the other end of the outer shell opposite to the limit baffle. A cavity is formed inside the outer shell. A through hole is provided on the limit baffle. The cavity is connected with the opening and the through hole.

[0007] A circuit board has a first surface and a second surface relative to each other, wherein the first surface is provided with an electrode cap, and the second surface is welded with circuit components, the circuit board is located in the cavity, the electrode cap is exposed to the outer shell through the through hole, and the circuit board is connected to the inner surface of the limit baffle.

[0008] Optionally, openings for filling solder are provided around the circuit board, and the solder in the openings fixedly connects the circuit board and the outer shell;

[0009] The circuit board is welded to the inner surface of the limit baffle of the outer shell.

[0010] Optionally, the controller also includes an inner shell, the inner shell is made of metal, a support portion for supporting the circuit board is formed at the top of the inner shell, the inner shell and the circuit board are connected by soldering, and the outer shell and the inner shell are welded.

[0011] Optionally, an outer shell pad is provided at the edge of the first surface of the circuit board, and the circuit board is welded or crimped to the inner surface of the limit baffle through the outer shell pad. An inner shell pad is provided at the edge of the second surface of the circuit board, and the supporting surface of the supporting part is tightly attached to the inner shell pad and is welded to the inner shell pad.

[0012] Optionally, the inner shell further includes an annular inner wall, the support portion is formed at one axial end of the inner wall and an arc-shaped transition portion is formed between the inner wall, and a first gap for accumulated solder is formed between the transition portion and the outer wall and the inner shell pad of the circuit board.

[0013] Optionally, a second gap for accumulating solder is formed between the inner wall of the inner shell and the outer wall of the outer shell, and the first gap is connected to the second gap.

[0014] Optionally, the support portion includes a plurality of limit bend feet formed at the top end of the inner wall and spaced apart circumferentially along the inner wall, each of the limit bend feet bends and extends toward the central axis direction of the inner wall to form a support surface for supporting the circuit board, and an arc-shaped transition portion is formed between each of the limit bend feet and the inner wall.

[0015] Optionally, a groove for accumulating solder is formed between two adjacent limiting bent legs.

[0016] Optionally, the electrode cap is a positive electrode cap or a negative electrode cap, and a circle of electrode cap pads for welding the electrode cap is arranged on the first surface of the circuit board.

[0017] Optionally, the electrode cap includes a hollow cylindrical cap body and an annular brim formed on the outer periphery of the cap body, and the controller also includes an electrode cap insulating sheet, a through hole is provided in the middle of the electrode cap insulating sheet, the cap body is exposed from the through hole, and the electrode cap insulating sheet covers the limit baffle and the brim.

[0018] Optionally, the bottom of the outer shell exceeds the inner shell, and the exceeding portion forms a positioning cylindrical structure for abutting against the shell of the lithium-ion battery cell.

[0019] Optionally, the bottom of the inner shell exceeds the outer shell, and the exceeding portion forms a positioning groove for sleeve-engaging the battery outer shell.

[0020] Optionally, it further comprises an inner electrode and an inner electrode insulating sheet, wherein the inner electrode insulating sheet has a notch, one end of the inner electrode is welded to the second surface of the circuit board, and the other end passes through the notch and is placed on the inner electrode insulating sheet, so that the other end of the inner electrode is insulated from the circuit board, and the inner electrode is electrically connected to the electrode cap through circuit components of the circuit board;

[0021] The cavity is filled with thermally conductive adhesive, and the thermally conductive adhesive covers the second surface of the circuit board to form a thermally conductive adhesive layer, and the inner electrode insulating sheet covers the thermally conductive adhesive layer.

[0022] Optionally, an inner electrode is further included, the cavity is filled with thermally conductive adhesive, the thermally conductive adhesive covers the second surface of the circuit board to form a thermally conductive adhesive layer, and the inner electrode is placed on the thermally conductive adhesive layer.

[0023] The present disclosure further provides a cylindrical battery, comprising:

[0024] A lithium-ion battery cell having a positive electrode and a negative electrode; and

[0025] The controller of the above-mentioned cylindrical battery is arranged at the positive end of the lithium-ion battery cell with a positive electrode, the outer shell of the controller is electrically connected to the negative electrode of the lithium-ion battery cell, and the inner electrode of the controller is electrically connected to the positive electrode of the lithium-ion battery cell.

[0026] Optionally, the lithium-ion battery cell is a soft-pack battery cell, the negative electrode provided at one end of the lithium-ion battery cell is a negative electrode sheet, the negative electrode sheet extends to the other end of the lithium-ion battery cell, the lithium-ion battery cell is inserted into a battery outer shell, the negative electrode sheet is welded to the battery outer shell, and the outer shell of the controller is connected to the battery outer shell;

[0027] The positive electrode arranged at the other end of the lithium-ion battery cell is a positive electrode sheet, and the positive electrode sheet is connected to the inner electrode of the controller.

[0028] Optionally, the outer shell of the lithium-ion battery cell is a steel shell, the steel shell of the lithium-ion battery cell is the negative electrode of the lithium-ion battery cell, and the outer shell of the controller is connected to the steel shell; the lithium-ion battery cell has a positive electrode boss, the positive electrode is connected to the positive electrode boss, and the positive electrode boss is connected to the inner electrode of the controller.

[0029] The present disclosure further provides a cylindrical battery, comprising:

[0030] A lithium-ion battery cell having a positive electrode and a negative electrode; and

[0031] The controller of the cylindrical battery mentioned above is arranged at the negative end of the lithium-ion battery cell having a negative electrode, the outer shell of the controller is electrically connected to the positive electrode of the lithium-ion battery cell, and the inner electrode of the controller is electrically connected to the negative electrode of the lithium-ion battery cell.

[0032] Optionally, the lithium-ion battery cell is a soft-pack battery cell, the positive electrode provided at one end of the lithium-ion battery cell is a positive electrode sheet, the positive electrode sheet extends to the other end of the lithium-ion battery cell, the lithium-ion battery cell is inserted into a battery outer shell, the positive electrode sheet is welded to the battery outer shell, and the outer shell of the controller is connected to the battery outer shell;

[0033] The negative electrode arranged at the other end of the lithium-ion battery cell is a negative electrode sheet, and the negative electrode sheet is connected to the inner electrode of the controller.

[0034] Optionally, the outer shell of the lithium-ion battery cell is an aluminum shell, the aluminum shell of the lithium-ion battery cell is the positive electrode of the lithium-ion battery cell, and the outer shell of the controller is connected to the aluminum shell;

[0035] The lithium-ion battery cell has a negative electrode boss, the negative electrode is connected to the negative electrode boss, and the negative electrode boss is connected to the inner electrode of the controller.

[0036] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0037] The present disclosure discloses a controller for a cylindrical battery. The controller includes an outer shell and a circuit board. The outer shell is made of metal, and includes a cylindrical outer wall and a limit baffle formed at one axial end of the outer wall. An opening is provided at the other end of the outer shell opposite to the limit baffle. A cavity is formed inside the outer shell, and a through hole is provided on the limit baffle. The cavity is connected to the opening and the through hole. The circuit board has a first surface and a second surface relative to each other. The first surface is provided with an electrode cap, and the second surface is provided with circuit components. The circuit board is located in the cavity, and the electrode cap is exposed to the outer shell through the through hole. The circuit board is connected to the inner surface of the limit baffle. With the help of the limit baffle of the outer shell, the circuit board is fixed to the outer shell. In this way, the circuit board is positioned in the cavity of the outer shell. Compared with the traditional support method of forming an arched boss through the battery shell, the height is shortened, thereby providing a larger space for the battery cell, at least keeping the battery capacity unaffected.

[0038] The present disclosure further provides a cylindrical battery, which includes the above-mentioned controller and a lithium-ion battery cell. The lithium-ion battery cell is provided with a positive electrode and a negative electrode. The controller is arranged at the positive end of the lithium-ion battery cell, the outer shell of the controller is connected to the shell of the lithium-ion battery cell or the outer shell of the battery, and the inner electrode of the controller is connected to the positive electrode of the lithium-ion battery cell. The cylindrical battery adopts the above-mentioned controller with reduced height, so that it can provide more sufficient space for the lithium-ion battery cell, keep the capacity of the lithium-ion battery cell unaffected, or provide a lithium-ion battery cell with higher height and larger capacity.

[0039] The present disclosure further provides a cylindrical battery, which includes the above-mentioned controller and a lithium-ion battery cell. The lithium-ion battery cell is provided with a positive electrode and a negative electrode, the controller is arranged at the negative end of the lithium-ion battery cell, the outer shell of the controller is connected to the shell of the lithium-ion battery cell or the outer shell of the battery, and the inner electrode of the controller is connected to the negative electrode of the lithium-ion battery cell. The cylindrical battery adopts the above-mentioned controller with reduced height, so that it can provide more sufficient space for the lithium-ion battery cell, keep the capacity of the lithium-ion battery cell unaffected, or provide a lithium-ion battery cell with higher height and larger capacity.

[0040] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0042] Figure 1 FIG. 4 is an exploded view of a controller of a cylindrical battery in an exemplary embodiment of the present disclosure.

[0043] Figure 2 yes Figure 1 Schematic diagram of the cross-section of the cylindrical battery controller after assembly.

[0044] Figure 3 FIG. 4 is an exploded view of a controller of a cylindrical battery in another exemplary embodiment of the present disclosure.

[0045] Figure 4 yes Figure 3 Schematic diagram of the cross-section of the cylindrical battery controller after assembly.

[0046] Figure 5 This is an exploded view of the controller for the No. 7 battery.

[0047] Figure 6 This is a cross-sectional diagram of the controller after assembly of the No. 7 battery.

[0048] Figure 7 This is an exploded view of a cylindrical battery.

[0049] Figure 8 It is a schematic diagram of the structure of the cylindrical battery after assembly.

[0050] Fig. 9 It is a cross-sectional view of a cylindrical battery after assembly.

[0051] Fig.10 It is a schematic diagram of the structure of the disclosed controller after the cylindrical battery is assembled with the negative terminal thereof.

[0052] Fig.11 It is an exploded view of a soft-pack cylindrical battery with the controller of the present invention disposed at the positive terminal.

[0053] Fig.12 yes Fig.11 Cross-sectional view of a cylindrical battery after assembly.

[0054] Fig.13 It is an exploded view of a soft-pack cylindrical battery with the controller of the present disclosure disposed at the negative terminal.

[0055] Fig.14 yes Fig.13 Cross-sectional view of a cylindrical battery after assembly. DETAILED DESCRIPTION

[0056] In order to further illustrate the principle and structure of the present disclosure, preferred embodiments of the present disclosure are now described in detail with reference to the accompanying drawings.

[0057] In one embodiment, please refer to Figure 1 and Figure 2 , Figure 1 is an exploded view of a controller of a cylindrical battery in an exemplary embodiment of the present disclosure, Figure 2 yes Figure 1 The controller 10a of the cylindrical battery is a schematic cross-sectional view after assembly, wherein the controller 10a comprises an outer shell 11a and a circuit board 13a. The circuit board 13a is located inside the outer shell 11a.

[0058] The outer shell 11a is made of metal, and includes a cylindrical outer wall 111a and a limit baffle 112a formed at one axial end of the outer wall 111a, and an opening is provided at the other end of the outer shell facing the limit baffle 112a. A cavity is formed inside the outer shell 11a, and a through hole is provided on the limit baffle 112a, and the cavity is connected with the opening and the through hole.

[0059] The circuit board 13a has a first surface and a second surface opposite to each other. The first surface is provided with an electrode cap 15a, and the second surface is welded with circuit components. The circuit board 13a is located in the cavity, and the electrode cap 15a is exposed to the outer shell 11a through the through hole of the limit baffle 112a.

[0060] The circuit board 13a is connected to the inner surface of the limiting baffle 112a. The connection method can be soldering connection, for example, coating solder paste on the inner surface of the limiting baffle 112a or the edge of the first surface of the circuit board 13a, and then heating and curing the solder paste by reflow soldering, so that the circuit board 13a and the limiting baffle 112a are cured and connected. In addition, soldering can also be performed using solder wire or solder ball.

[0061] The solution disclosed in the present invention uses the limiting baffle of the outer shell 11a to fix the circuit board 13a and the limiting baffle 112a, and then fix the circuit board 13a and the outer shell 11a. In this way, the circuit board 13a and the outer shell 11a are directly fixed. Compared with the traditional support method of forming an arched boss through the battery shell, the height is shortened, thereby providing more space for the battery cells and at least keeping the battery capacity unaffected.

[0062] The periphery of the circuit board 13a is provided with an opening 133a for filling with solder, and the solder in the opening 133a fixedly connects the circuit board 13a and the outer shell 11a. The solder can be solder paste or tin solder melted from tin wire or solder ball. The solder fills the opening space at the edge of the circuit board 13a, increasing the area of ​​the circuit board 13a and the outer shell 11a coated with solder paste or the welding area, thereby strengthening the connection strength between the circuit board 13a and the outer shell 11a.

[0063] The controller 10a further includes an inner electrode 16a and an inner electrode insulating sheet 17a. The inner electrode insulating sheet 17a has a notch, one end of the inner electrode 16a is welded to the second surface of the circuit board 13a, and the other end passes through the notch and is placed on the inner electrode insulating sheet 17a, so that the other end of the inner electrode 16a is insulated from the circuit board 13a. The inner electrode 16a is electrically connected to the electrode cap 15a through the circuit components of the circuit board 13a.

[0064] The controller 10a further includes an electrode cap insulating sheet 14a, which is in the shape of a disk and has a through hole in the middle, through which the cap body of the electrode cap 15 is exposed to the outer shell. The electrode cap insulating sheet 14a covers the limit baffle 112a and the brim of the electrode cap 15. The electrode cap insulating sheet 14a isolates the electrode cap 15a and the outer shell 11a to prevent the two from being conductive.

[0065] In another embodiment, the controller of the present disclosure may include a double housing structure. Figure 3 and Figure 4 , Figure 3 is an exploded view of a controller of a cylindrical battery in another exemplary embodiment of the present disclosure, Figure 4 yes Figure 3The schematic cross-sectional view of the controller of the cylindrical battery after assembly is shown in FIG. 1 , wherein the controller 10 comprises an outer shell 11, an inner shell 12 and a circuit board 13. The circuit board 13 is located inside the outer shell 11, and the inner shell 12 is located inside the outer shell 11 and below the circuit board 13. A support portion 121 for supporting the circuit board 13 is formed at the top end of the inner shell 12, and the support portion 121 is connected to the circuit board 13 by soldering. The outer shell 11 and the inner shell 12 can also be connected by soldering.

[0066] Specifically, the outer shell 11 is cylindrical and made of metal. The outer shell 11 includes a cylindrical outer wall 111 and a limit baffle 112 forming one axial end of the outer wall. The limit baffle 112 is arranged around the inner circumference of the outer wall 111. The inner diameter of the limit baffle 112 is smaller than the outer diameter of the circuit board 13, so that the circuit board 13 can be limited inside the outer shell 11 to prevent it from being exposed. An opening is provided at the other end of the outer shell 11 opposite to the limit baffle 112. A cavity is formed inside the outer shell 11, and a through hole is provided on the limit baffle 112. The cavity is connected to the opening at the other end of the outer shell 11 and the through hole of the limit baffle 112.

[0067] Optionally, the other end of the outer shell 11 relative to the limit baffle 112 is provided with a plurality of pressure relief grooves 113, and the plurality of pressure relief grooves 113 are arranged at intervals along the periphery of the outer shell 11. The pressure relief grooves 113 are used to discharge the gas generated by the lithium-ion battery cell to reduce the internal pressure.

[0068] The circuit board 13 may be in the shape of a disk, and has a first surface 131 and a second surface 132 opposite to each other. The electrode cap 15 is disposed on the first surface 131. The circuit components are disposed on the second surface 132, and the circuit components may include components for controlling charging and / or discharging.

[0069] A circle of shell pads 1311 are also provided at the edge of the first surface 131, and the shell pads 1311 are connected to the inner surface of the limiting baffle 112 by reflow soldering. Alternatively, the shell pads 1311 are crimped to the limiting baffle 112 through the inner shell 12, that is, the circuit board 13 is directly supported by the inner shell 12. In other words, the connection between the circuit board and the limiting baffle can be soldered in the above embodiment, or the circuit board can be pressed by the inner shell to make the circuit board contact with the limiting baffle for crimping connection, or the inner shell can be crimped to the circuit board, and the circuit board is then soldered to the limiting baffle. An inner shell pad 1321 is provided at the edge of the second surface 132, and the inner shell pad 1321 is welded to the support portion 121 of the inner shell 12.

[0070] The inner shell 12 is made of metal. The inner shell 12 includes an annular inner wall 122 and the support portion 121 connected to the inner wall 122. The inner wall 122 is cylindrical. The support portion 121 bends and extends toward the central axis of the inner wall 122 to form a support surface for supporting the circuit board 13.

[0071] The support portion 121 includes a plurality of limit bend feet 1221 formed at the top end of the inner wall 122 and distributed at intervals along the circumference of the inner wall 122. Each limit bend foot 1221 bends and extends toward the central axis direction of the inner wall 122 to form a support surface for supporting the circuit board 13. A circular arc chamfer is formed between each limit bend foot 1221 and the inner wall 122, that is, an arc-shaped transition portion 123 is formed.

[0072] A first gap 181 for accumulating solder paste is formed between the transition portion 123 and the outer wall 111 and the inner shell pad 1321 of the circuit board 13. A second gap 182 for accumulating solder paste is formed between the inner wall 122 of the inner shell 12 and the outer wall 111 of the outer shell 11, and the first gap 181 and the second gap 182 are connected. When the circuit board 13, the inner shell 12 and the outer shell 11 are soldered, for example, by reflow soldering, the solder paste coated on the outer shell pad 1311 and the inner shell pad 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. In this way, the circuit board 13, the inner shell 12 and the outer shell 11 can be firmly soldered.

[0073] In addition, in order to facilitate the installation between the inner shell 12 and the outer shell 11, a gap is also reserved between the outer surface of the inner side wall of the inner shell 12 and the inner surface of the outer wall 111 of the outer shell 11, and part of the solder paste on the outer shell pad 1311 and the inner shell pad 1321 will also flow into the gap to fill the gap. After the solder paste is heated and cured, the outer shell pad 1311 is connected to the limit baffle 112 of the outer shell 11, and the inner shell pad 1321 is connected to the support surface of the support part 121 of the inner shell 12. After the solder paste is cured, it supports the circuit board together with the support part 121. Since the solder paste has good shear resistance, the support part 121 and the solder paste can provide a firm support for the circuit board 13 after being combined.

[0074] A groove 124 for accumulating solder paste is formed between the two limit bending legs 1221 of the support portion 121. When the solder paste is heated and solidified, the solder paste on the inner shell pad 1321 is squeezed into the groove 124. In this way, the connection between the outer shell 11, the circuit board 13 and the inner shell 12 is further strengthened.

[0075] In the present disclosure, tin wire or tin ball may be used instead of tin paste, and the gap, the first gap or the second gap may be filled with fluid tin solder after the tin wire or tin ball is melted.

[0076] Optionally, the limiting bent legs 1211 of the inner shell 12 are arranged at equal intervals along the circular periphery surrounded by the inner wall 122 .

[0077] Optionally, the limiting bent legs 1211 of the inner shell 12 may be arranged at unequal intervals.

[0078] The number of the limiting bent legs 1211 can be determined according to the size of the inner shell 12. For batteries with slightly larger sizes, such as AA batteries, Figure 3 In the structure of the inner shell 12 shown in the figure, the limit bends 1211 of the inner shell 12 are arranged at equal intervals and the number is 9, and the spacing between each other is small. For small-sized batteries, such as AAA batteries, the reduction in the number of limit bends can also meet the welding strength. Figure 5 As shown, it is an exploded view of the controller of No. 7 battery. The number of limit bends 1211 is reduced to 5, and the ratio of the distance between two adjacent limit bends 1211 to the total circumference of the inner shell 12 is increased.

[0079] Optionally, the support portion 121 of the inner shell 12 may also be an annular support that bends and extends toward the central axis direction of the inner side wall 122 , and the annular support forms an annular support surface to support the circuit board 13 .

[0080] The top of the inner shell 12 of the present disclosure is formed with a support portion 121 for supporting the circuit board. The support portion 121 supports the circuit board from below, and the limiting baffle 112 of the outer shell limits the circuit board 13 from above, so that the circuit board 13 is positioned in the outer shell 11. In this way, through the limiting and supporting effects of the outer shell 11 and the inner shell 12, the circuit board 13 is positioned in the cavity of the outer shell 11. Compared with the traditional support method of forming an arched boss through the battery shell, the height is shortened, thereby providing a larger space for the battery cell, at least keeping the battery capacity unaffected.

[0081] Optional, such as Figure 3 and Figure 4 As shown, for a No. 5 battery, the outer shell 11 can be designed so that its bottom exceeds the inner shell 12, and the exceeding portion forms a positioning cylindrical structure 114 for abutting against the shell of the lithium-ion battery cell.

[0082] Optional, such as Figure 6 As shown, Figure 6 It is a cross-sectional schematic diagram of the controller of the No. 7 battery after assembly. For the No. 7 battery, the bottom of the inner shell 12 exceeds the bottom of the outer shell 11, and the exceeding part forms an annular positioning groove 125 for fitting the battery outer shell.

[0083] Please continue to refer to Figure 3 and Figure 4, 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 brim 152 formed on the outer periphery of the cap body 151. The electrode cap 15 protrudes from the outer shell 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 controller 10 is connected to the outer shell 11, 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 controller 10 is connected to the outer shell 11, the electrode cap 15 is connected to the negative electrode of the battery cell, and the electrode cap 15 is a negative electrode cap.

[0084] The controller 10 further includes an electrode cap insulating sheet 14, which is in the shape of a disk and has a through hole 141 in the middle. The cap body 151 is exposed to the outer shell 11 through the through hole 141, and the electrode cap insulating sheet covers the limit baffle 112 and the brim 152. The electrode cap insulating sheet 14 isolates the electrode cap 15 and the outer shell 11 to prevent the two from being conductive.

[0085] The second surface of the circuit board 13 is also provided with an inner electrode pad for welding the inner electrode 16, and the inner electrode pad is also provided with an inner electrode positioning hole 134, and the positioning foot 163 of the inner electrode 16 is inserted into the inner electrode positioning hole 134, which ensures the circumferential positioning of the inner electrode 16 on the circuit board 13. The inner electrode 16 includes an electrode strip 161 and an inner electrode circuit board welding platform 164, and the inner electrode circuit board welding platform 164 forms an L shape with the electrode strip 161. The inner electrode circuit board welding platform 164 is against the inner electrode pad on the second surface of the circuit board 13, which ensures the axial positioning of the inner electrode 16 on the circuit board 13. The inner electrode circuit board welding platform 164 increases the contact area between the inner electrode 16 and the circuit board 13, which is conducive to the passage of a larger current. At the same time, when the current passes through the inner electrode 16, the heat generated at the connection part between the inner electrode 16 and the circuit board 13 can be reduced.

[0086] The inner electrode 16 is also provided with a bending positioning groove 162 , which can locate the bending position on the one hand, and reduce stress concentration on the other hand, thereby ensuring that the inner electrode 16 is folded at the bending positioning groove 162 , thereby ensuring the consistency of the folding of the inner electrode 16 .

[0087] The movable end 167 of the inner electrode 16 is provided with a resistance welding choke 165 to increase the current path when the inner electrode 16 is resistance welded to the positive electrode boss of the lithium-ion battery cell, thereby increasing the welding strength. The movable end 167 of the inner electrode 16 may be in a strip shape.

[0088] Optional, such as Figure 5As shown, when the battery is relatively small, for example, a AAA battery, the movable end 167 of the inner electrode 16 can be designed to be in a round shape to increase the contact area of ​​the electrode.

[0089] The circuit board 13 is provided with a glue injection hole and an exhaust overflow hole. In a vacuum environment, the pre-formulated thermal conductive glue is poured into the cavity of the outer shell 11 through the glue injection hole 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 cap 15, it overflows from the exhaust overflow hole of the circuit board 13 to the cavity formed by the second surface 132 of the circuit board 13 and the outer shell 11 until the thermal conductive glue covers the components on the second surface of the entire circuit board 13 and forms a layer of thermal conductive glue. The movable end of the inner electrode 16 and most of the electrode strips are exposed to the thermal conductive glue layer.

[0090] An inner electrode insulating sheet 17 is covered on the thermal conductive adhesive layer. The inner electrode insulating sheet 17 has a notch. One end of the inner electrode 16 is welded to the second surface 132 of the circuit board 13, and the other end passes through the notch to be 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 is bent for the second time at the bending positioning groove 162.

[0091] In one embodiment, the inner electrode insulating sheet may be omitted. In this manner, the inner electrode 16 may be directly placed on the thermal conductive adhesive layer.

[0092] The controller disclosed in the present invention includes an outer shell, a circuit board and an inner shell, wherein a limit baffle is provided on one end face of the outer shell, and a support portion is provided on the top of the inner shell, the support portion supports the circuit board from below, and the limit baffle limits the circuit board at the top, so that the circuit board is positioned in the outer shell. In this way, through the limit and support functions of the outer shell and the inner shell, compared with the traditional support method of forming an arched boss through the battery shell, the height is shortened, thereby providing a larger space for the battery cell, which is conducive to keeping the battery capacity unaffected.

[0093] The present disclosure also provides a cylindrical battery, which can be a No. 5 battery or a No. 7 battery. Figure 7 and Figure 8 As shown, it is an exploded view of a cylindrical battery. Figure 7 1 is a schematic diagram of the structure of a cylindrical battery after assembly. The cylindrical battery 100 includes a lithium ion battery cell 20 and the above Figures 1 to 5 The controller 10 according to any embodiment.

[0094] The lithium-ion battery cell 20 is filled with electrolyte, and is provided with a negative electrode and a positive electrode. The negative electrode is connected to the shell 24 of the lithium-ion battery cell, and the shell 24 is a steel shell, which is the negative electrode of the lithium-ion battery cell. The top of the lithium-ion battery cell 20 is the positive electrode terminal, and the positive electrode terminal is provided with a positive electrode boss 21, and the positive electrode boss 21 is electrically connected to the positive electrode inside the lithium-ion battery cell 20. The side wall of the positive electrode boss 21 is provided with a battery cell pressure relief groove 22, and the bubbles generated by the lithium-ion battery cell are discharged through the battery cell pressure relief groove 22.

[0095] The controller 10 is arranged at the positive terminal of the lithium-ion battery cell 20, and its outer shell 11 is welded to the shell 24 of the lithium-ion battery cell, so that the outer shell 11 of the controller is electrically connected to the negative electrode of the lithium-ion battery cell. A pressure relief groove 113 is formed between the outer shell 11 and the shell 24 of the lithium-ion battery cell 20, and the gas discharged from the battery cell pressure relief groove 22 enters the outer shell 11 and is discharged through the pressure relief groove 113 of the outer shell 11, thereby reducing the gas pressure inside the lithium-ion battery cell 20. The movable end of the inner electrode 16 of the controller 10 is welded to the positive electrode boss 21.

[0096] The outer periphery of the positive electrode boss 21 of the lithium-ion battery cell 20 is provided with a battery cell insulating sheet 23 , which is annular and is used to isolate the positive electrode boss 21 from contact with the shell 24 to avoid short circuit.

[0097] like Fig. 9 , which is a cross-sectional view of the cylindrical battery after assembly. The bottom of the outer shell of the controller 10 exceeds the bottom of the inner shell 12, and the portion of the outer shell 11 that exceeds the bottom forms a positioning cylindrical structure 114, which surrounds a circle of positioning grooves, and the top of the lithium-ion battery cell 20 is inserted into the positioning groove. The positioning cylindrical structure 114 abuts against the fillet of the shell 24 of the lithium-ion battery cell 20 at the periphery, and a weld is formed at the joint of the two for welding.

[0098] In one embodiment, the present disclosure further provides a cylindrical battery, such as Fig.10As shown, the controller is installed at the negative end of the lithium-ion battery cell. Specifically, the cylindrical battery 200 includes a lithium-ion battery cell 20b and a controller 10b. The controller 10b can adopt the same structure as the controller 10 or the controller 10a in the above embodiment. In this embodiment, the electrode cap of the controller 10b is a negative electrode cap 15b. The lithium-ion battery cell 20b is filled with electrolyte. The lithium-ion battery cell 20b is provided with a positive electrode and a negative electrode. The positive electrode is connected to the shell 24b of the lithium-ion battery cell 20b. The shell 24b can be an aluminum shell, that is, the aluminum shell of the lithium-ion battery cell 20b is the positive electrode of the lithium-ion battery cell 20b. The controller 10b is arranged at the negative end of the lithium-ion battery cell. The outer shell 11b of the controller is connected to the shell of the lithium-ion battery cell. The outer shell 11b of the controller is electrically connected to the positive electrode of the lithium-ion battery cell, and the inner electrode of the controller is electrically connected to the negative electrode of the lithium-ion battery cell.

[0099] In one embodiment, the present disclosure provides a soft-pack cylindrical battery, the cylindrical battery comprising the above-mentioned controller, the controller being provided with a positive terminal. Fig.11 and Fig.12 As shown, Fig.11 This is an exploded view of a soft-pack cylindrical battery with the controller of the present disclosure disposed at the positive terminal. Fig.12 yes Fig.11 The cross-sectional view of the cylindrical battery after assembly, the cylindrical battery 300 includes a lithium-ion battery cell 20c and a controller 10c. The controller 10c can adopt the same structure as the controller 10 or the controller 10a in the above embodiment. In this embodiment, the electrode cap of the controller 10c is a positive electrode cap 15c.

[0100] The outer shell 21c of the lithium-ion battery cell 20c is a soft outer shell, that is, the lithium-ion battery cell is a soft-pack battery cell, and a negative electrode sheet 22c is provided at one end of the soft outer shell, and the negative electrode sheet 22c extends to the other end of the lithium-ion battery cell. The lithium-ion battery cell 20c is inserted into a battery outer shell 24c, and the negative electrode sheet 22c is welded and connected to the battery outer shell 24c. The outer shell 11c of the controller is connected to the battery outer shell 24c. A positive electrode sheet 23c is provided at the other end of the lithium-ion battery cell 20c, and the positive electrode sheet 23c is connected to the inner electrode of the controller 10c.

[0101] In one embodiment, the controller may also be disposed at the negative terminal of a soft-pack cylindrical battery. Specifically, the present disclosure further provides a cylindrical battery, such as Fig.13 and Fig.14 As shown, Fig.13 This is an exploded view of a soft-pack cylindrical battery with the controller of the present disclosure disposed at the negative terminal. Fig.14 yes Fig.13The cross-sectional view of the cylindrical battery after assembly, the cylindrical battery 400 includes a lithium-ion battery cell 20d and a controller 10d. The controller 10d can adopt the same structure as the controller 10 or the controller 10a in the above embodiment. In this embodiment, the electrode cap of the controller 10d is a negative electrode cap 15d.

[0102] The outer shell 21d of the lithium-ion battery cell 20d is a soft outer shell, that is, the lithium-ion battery cell is a soft-pack battery cell, and a positive electrode sheet 22d is provided at one end of the soft outer shell, and the positive electrode sheet 22d extends to the other end of the lithium-ion battery cell. The lithium-ion battery cell 20d is inserted into a battery outer shell 24d, and the positive electrode sheet 22d is welded and connected to the battery outer shell 24d, and a positive electrode boss is formed at the bottom end of the battery outer shell. The outer shell 11d of the controller is connected to the battery outer shell 24d. A negative electrode sheet 23d is provided at the other end of the lithium-ion battery cell, and the negative electrode sheet 23d is connected to the inner electrode of the controller.

[0103] The above are only preferred feasible embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure. All equivalent structural changes made using the contents of the present disclosure and the drawings are included in the protection scope of the present disclosure.

Claims

1. A controller for a cylindrical battery, characterized in that: include: The outer shell is made of metal and includes a cylindrical outer wall and a limit baffle formed at one axial end of the outer wall, the limit baffle is arranged around the inner circumference of the outer wall, an opening is arranged at the other end of the outer shell facing the limit baffle, a cavity is formed inside the outer shell, a through hole is arranged on the limit baffle, and the cavity is connected with the opening and the through hole; A circuit board having a first surface and a second surface opposite to each other, wherein the first surface is provided with an electrode cap, and the second surface is welded with circuit components, the circuit board is located in the cavity, the electrode cap is exposed to the outer shell through the through hole, and the circuit board is connected to the inner surface of the limit baffle; The controller further comprises an inner shell, the inner shell is made of metal, a support portion for supporting the circuit board is formed at the top of the inner shell, the inner shell and the circuit board are connected by soldering, and the outer shell and the inner shell are connected by welding; The inner shell includes an annular inner wall, the support portion is formed at one axial end of the inner wall and an arc-shaped transition portion is formed between the inner wall, and a first gap for accumulating solder is formed between the transition portion and the outer wall and the inner shell pad of the circuit board.

2. The controller of the cylindrical battery according to claim 1, characterized in that: The circuit board is provided with openings for filling solder around its periphery, and the solder in the openings fixedly connects the circuit board and the outer shell; The circuit board is welded to the inner surface of the limit baffle of the outer shell.

3. The controller of the cylindrical battery according to claim 1, characterized in that: An outer shell pad is provided at the edge of the first surface of the circuit board, and the circuit board is welded or crimped to the inner surface of the limit baffle through the outer shell pad. An inner shell pad is provided at the edge of the second surface of the circuit board, and the supporting surface of the supporting part is tightly attached to the inner shell pad and is welded to the inner shell pad.

4. The controller of the cylindrical battery according to claim 1, characterized in that: A second gap for accumulating solder is formed between the inner side wall of the inner shell and the outer side wall of the outer shell, and the first gap is connected to the second gap.

5. The controller of the cylindrical battery according to claim 4, characterized in that: The support portion includes a plurality of limit bend feet formed at the top end of the inner wall and distributed at intervals along the circumference of the inner wall. Each of the limit bend feet is bent and extended toward the central axis direction of the inner wall to form a support surface for supporting the circuit board. An arc-shaped transition portion is formed between each of the limit bend feet and the inner wall.

6. The controller of the cylindrical battery according to claim 5, characterized in that: A groove for accumulating solder is formed between two adjacent limiting bent legs.

7. The controller of a cylindrical battery according to any one of claims 1 to 6, characterized in that: The electrode cap is a positive electrode cap or a negative electrode cap, and a circle of electrode cap pads for welding the electrode cap is arranged on the first surface of the circuit board.

8. The controller of the cylindrical battery according to claim 7, characterized in that: The electrode cap includes a hollow cylindrical cap body and an annular brim formed on the outer periphery of the cap body. The controller also includes an electrode cap insulating sheet, a through hole is provided in the middle of the electrode cap insulating sheet, the cap body is exposed from the through hole, and the electrode cap insulating sheet covers the limit baffle and the brim.

9. The controller of the cylindrical battery according to claim 1, characterized in that: The bottom of the outer shell exceeds the inner shell, and the exceeding portion forms a positioning cylindrical structure for abutting against the shell of the lithium-ion battery cell.

10. The controller of the cylindrical battery according to claim 1, characterized in that: The bottom of the inner shell exceeds the outer shell, and the exceeding portion forms a positioning groove for sleeve-engaging the battery outer shell.

11. The controller of the cylindrical battery according to claim 1, characterized in that: It also includes an inner electrode and an inner electrode insulating sheet, wherein the inner electrode insulating sheet has a notch, one end of the inner electrode is welded to the second surface of the circuit board, and the other end passes through the notch to be placed on the inner electrode insulating sheet, so that the other end of the inner electrode is insulated from the circuit board, and the inner electrode is electrically connected to the electrode cap through circuit components of the circuit board; The cavity is filled with thermally conductive adhesive, the thermally conductive adhesive covers the second surface of the circuit board to form a thermally conductive adhesive layer, and the inner electrode insulating sheet covers the thermally conductive adhesive layer.

12. The controller of the cylindrical battery according to claim 1, characterized in that: It also includes an inner electrode. The cavity is filled with thermally conductive adhesive. The thermally conductive adhesive covers the second surface of the circuit board to form a thermally conductive adhesive layer. The inner electrode is placed on the thermally conductive adhesive layer.

13. A cylindrical battery, characterized in that: include: A lithium-ion battery cell is provided with a positive electrode and a negative electrode; and The controller of a cylindrical battery according to any one of claims 1 to 12, wherein the controller is arranged at the positive terminal of the lithium-ion battery cell having a positive electrode, the outer shell of the controller is electrically connected to the negative electrode of the lithium-ion battery cell, and the inner electrode of the controller is electrically connected to the positive electrode of the lithium-ion battery cell.

14. The cylindrical battery according to claim 13, characterized in that: The lithium-ion battery cell is a soft-pack battery cell, the negative electrode provided at one end of the lithium-ion battery cell is a negative electrode sheet, the negative electrode sheet extends to the other end of the lithium-ion battery cell, the lithium-ion battery cell is sleeved into a battery outer shell, the negative electrode sheet is welded to the battery outer shell, and the outer shell of the controller is connected to the battery outer shell; The positive electrode arranged at the other end of the lithium-ion battery cell is a positive electrode sheet, and the positive electrode sheet is connected to the inner electrode of the controller.

15. The cylindrical battery according to claim 13, characterized in that: The outer shell of the lithium-ion battery cell is a steel shell, the steel shell of the lithium-ion battery cell is the negative electrode of the lithium-ion battery cell, and the outer shell of the controller is connected to the steel shell; The lithium-ion battery cell has a positive electrode boss, the positive electrode is connected to the positive electrode boss, and the positive electrode boss is connected to the inner electrode of the controller.

16. A cylindrical battery, characterized in that: include: A lithium-ion battery cell is provided with a positive electrode and a negative electrode; and The controller of a cylindrical battery according to any one of claims 1 to 12, wherein the controller is arranged at the negative terminal of the lithium ion battery cell having a negative electrode, the outer shell of the controller is electrically connected to the positive electrode of the lithium ion battery cell, and the inner electrode of the controller is electrically connected to the negative electrode of the lithium ion battery cell.

17. The cylindrical battery according to claim 16, characterized in that: The lithium-ion battery cell is a soft-pack battery cell, the positive electrode provided at one end of the lithium-ion battery cell is a positive electrode sheet, the positive electrode sheet extends to the other end of the lithium-ion battery cell, the lithium-ion battery cell is inserted into a battery outer shell, the positive electrode sheet is welded to the battery outer shell, and the outer shell of the controller is connected to the battery outer shell; The negative electrode arranged at the other end of the lithium-ion battery cell is a negative electrode sheet, and the negative electrode sheet is connected to the inner electrode of the controller.

18. The cylindrical battery according to claim 16, characterized in that: The outer shell of the lithium-ion battery cell is an aluminum shell, the aluminum shell of the lithium-ion battery cell is the positive electrode of the lithium-ion battery cell, and the outer shell of the controller is connected to the aluminum shell; The lithium-ion battery cell has a negative electrode boss, the negative electrode is connected to the negative electrode boss, and the negative electrode boss is connected to the inner electrode of the controller.

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