CN211017219U

CN211017219U - Columnar lithium ion rechargeable battery and controller thereof

Info

Publication number: CN211017219U
Application number: CN202020117179.XU
Authority: CN
Inventors: 李松; 马岳; 邓爱雯
Original assignee: Shenzhen Maigesong Electrical Technology Co ltd
Current assignee: Megson Hubei Power System Co ltd
Priority date: 2020-01-17
Filing date: 2020-01-17
Publication date: 2020-07-14
Anticipated expiration: 2030-01-17

Abstract

The present disclosure discloses a cylindrical lithium ion rechargeable battery and a controller thereof, the cylindrical lithium ion rechargeable battery including a lithium ion cell and a controller. The controller includes a controller housing and a circuit board. The controller shell is provided with an inner cavity, an opening is formed in one axial end of the controller shell, and a plurality of pressure relief holes are formed in the side wall of the controller shell. The circuit board is accommodated in the inner cavity, an electrode cap is arranged on the circuit board, and the electrode cap is exposed out of the controller shell through the opening.

Description

Columnar lithium ion rechargeable battery and controller thereof

Technical Field

The present disclosure relates to the field of secondary batteries, and particularly to a cylindrical lithium ion rechargeable battery and a controller thereof.

Background

Cylindrical batteries, such as No. 5 batteries and No. 7 batteries, are widely used in toys, flashlights, alarm clocks, etc. in daily life. The batteries are classified into nickel-cadmium batteries, nickel-hydrogen batteries, zinc-manganese batteries, lithium ion batteries, and the like. In recent years, with the increasing demand for battery durability, lithium ion batteries have attracted much attention due to their high energy storage capacity.

Because the chemical property of lithium is more lively, can produce gas expansion when electric core became invalid, lead to the battery to press the increase in, pressure reaches certain degree and can lead to battery electricity core to take place to break and arouse the weeping and take place incident such as fire or explosion, consequently in order to guarantee user's safety in utilization, can set up pressure relief device inside battery electricity core usually. The controller of the battery is generally disposed at the end of the battery cell, so that the controller is flushed away directly when the gas inside the battery cell is released. Although such a method can effectively avoid serious safety accidents such as fire or explosion, the safety performance still needs to be further improved.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the safety performance of a lithium ion battery is not high in the related art, the cylindrical lithium ion rechargeable battery with high safety performance and the controller thereof are disclosed.

The present disclosure provides a controller comprising:

the controller comprises a controller shell, a pressure sensor and a controller, wherein the controller shell is provided with an inner cavity, one axial end of the controller shell is provided with an opening, and the side wall of the controller shell is provided with a plurality of pressure relief holes;

the circuit board is accommodated in the inner cavity, an electrode cap is arranged on the circuit board, and the electrode cap is exposed out of the controller shell through the opening.

Optionally, the pressure relief hole is formed in the edge of the bottom of the side wall of the controller housing, and the pressure relief holes are distributed at intervals along the bottom periphery of the controller housing.

Optionally, the pressure relief hole is a rectangular notch or an arc notch.

Optionally, the plurality of pressure relief holes are round holes distributed at intervals along the circumferential direction of the controller shell.

Optionally, the controller housing includes:

the electrode cap is exposed out of the shell through the through hole, and the pressure relief hole is formed in one end, far away from the limiting baffle, of the outer side wall; and

the inner shell body is contained in the inner cavity, one end of the inner shell body is formed with a supporting edge portion for supporting the circuit board, the outer shell body is connected with the inner shell body through tin soldering, and the circuit board is connected with the supporting edge portion of the inner shell body through tin soldering.

Optionally, the bottom of the outer casing exceeds the bottom of the inner casing to form a positioning cylindrical surface structure for positioning the lithium ion battery cell casing.

Optionally, the circuit board includes a first surface and a second surface that are arranged oppositely, the first surface is provided with a housing pad, and the housing pad is welded to the limit baffle of the housing body;

an inner shell welding plate is arranged on the second surface of the circuit board and is connected with the inner shell in a welding mode;

an electrode cap welding plate is arranged on the first surface of the circuit board and is connected with the electrode cap in a welding mode;

the controller further comprises an inner electrode, an inner electrode pad is arranged on the second surface, and the inner electrode pad is connected with the inner electrode in a welding mode.

The present disclosure additionally provides a cylindrical lithium ion rechargeable battery, comprising:

the lithium ion battery comprises a lithium ion battery cell, a battery and a battery, wherein the lithium ion battery cell is provided with a positive electrode and a negative electrode, and a shell of the lithium ion battery cell is the negative electrode;

in the controller, the controller is installed at the positive end of the lithium ion cell, where the positive electrode is arranged, the internal electrode of the controller is connected with the positive electrode of the lithium ion cell, and the controller shell of the controller is connected with the shell of the lithium ion cell.

Optionally, a plurality of cell pressure relief holes are formed in the positive end of the lithium ion cell, and the cell pressure relief holes are communicated with the pressure relief holes of the controller.

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

the lithium ion battery comprises a lithium ion battery cell, a battery cover and a battery cover, wherein a positive electrode and a negative electrode are respectively arranged at two ends of the lithium ion battery cell, and a shell of the lithium ion battery cell is the positive electrode;

in the controller, the controller is installed at the negative electrode end of the lithium ion cell, which is provided with the negative electrode, the inner electrode of the controller is connected with the negative electrode of the lithium ion cell, and the controller shell of the controller is connected with the shell of the lithium ion cell.

Optionally, a plurality of cell pressure relief holes are formed in the negative end of the lithium ion cell.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the present disclosure provides a controller including a controller housing and a circuit board mounted within the controller housing. The controller housing has an inner cavity with an opening at one axial end. The circuit board is accommodated in the inner cavity, an electrode cap is arranged on the circuit board, and the electrode cap is exposed out of the controller shell through the opening. The side wall of the controller shell is provided with a plurality of pressure relief holes, and the electrolyte of the battery cell is discharged by the pressure relief holes when the battery cell fails, so that the air pressure inside the controller shell is reduced, and fire or explosion is prevented.

The present disclosure further provides a cylindrical lithium ion rechargeable battery, which includes a lithium ion battery cell and the above controller. The lithium ion cell is provided with a positive electrode and a negative electrode, and a shell of the lithium ion cell is the positive electrode. The controller is installed at the negative electrode end of the lithium ion cell, the inner electrode of the controller is connected with the negative electrode of the lithium ion cell, and the controller shell of the controller is connected with the shell of the lithium ion cell. The controller shell of the columnar lithium ion rechargeable battery is provided with a plurality of pressure relief holes, and the electrolyte of the battery cell is discharged when the battery cell fails, so that the air pressure inside the controller shell is reduced, and the controller shell is prevented from being ignited or exploded.

The present disclosure further provides a cylindrical lithium ion rechargeable battery, which includes a lithium ion battery cell and the above controller. The lithium ion cell is provided with a positive electrode and a negative electrode, and the shell of the lithium ion cell is the negative electrode. The controller is installed at the positive electrode end of the lithium ion cell, the inner electrode of the controller is connected with the positive electrode of the lithium ion cell, and the controller shell of the controller is connected with the shell of the lithium ion cell. The controller shell of the columnar lithium ion rechargeable battery is provided with a plurality of pressure relief holes, and the electrolyte of the battery cell is discharged when the battery cell fails, so that the air pressure inside the controller shell is reduced, and the controller shell is prevented from being ignited or exploded.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

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 disclosure.

Fig. 1 is an exploded view of a controller of the present disclosure.

Fig. 2 is a cross-sectional view of the controller of the present disclosure after assembly.

Fig. 3 is a bottom schematic view of the controller of the present disclosure assembled.

Fig. 4 is an exploded view of the controller of the present disclosure in which the electrode cap is a negative electrode cap.

Fig. 5 is a cross-sectional view of the controller with the electrode cap of the present disclosure being a negative electrode cap.

Fig. 6 is an exploded view of the negative electrode cap and circuit board.

Fig. 7 is an exploded view of a cylindrical lithium ion rechargeable battery.

Fig. 8 is a schematic structural view of the assembled cylindrical lithium-ion rechargeable battery.

Fig. 9 is a sectional view of the assembled cylindrical lithium-ion rechargeable battery.

Detailed Description

For further explanation of the principles and construction of the present disclosure, reference will now be made in detail to the preferred embodiments of the present disclosure, which are illustrated in the accompanying drawings.

The present disclosure provides a controller that is mounted on a cell, for example, a lithium battery cell, to form a lithium ion rechargeable battery with a controller, for example, a No. 5 battery, a No. 7 battery, etc. The controller includes a controller housing and a circuit board mounted within the controller housing. The controller shell is provided with an inner cavity, an opening is formed in one axial end of the controller shell, a plurality of pressure relief holes are formed in the side wall of the controller shell, electrolyte of the battery cell is discharged when the battery cell fails through the pressure relief holes, air pressure inside the controller shell is reduced, and ignition or explosion is prevented. The circuit board is accommodated in the inner cavity, an electrode cap is arranged on the circuit board, and the electrode cap is exposed out of the controller shell through the opening.

The controller shell can be of a single shell structure or a double shell structure. The solution of the present disclosure is illustrated below by taking a double shell as an example.

As shown in fig. 1 to 3, fig. 1 is an exploded view of the controller of the present disclosure, fig. 2 is a sectional view of the controller of the present disclosure after assembly, and fig. 3 is a bottom schematic view of the controller of the present disclosure after assembly. 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.

Specifically, the outer case 11 is cylindrical and made of a metal material. The outer case 11 includes a cylindrical outer side wall 111 and a limit stopper 112 forming an axial end of the outer side wall and perpendicular to the outer side wall. The limit stop 112 is disposed around the inner circumference of the outer sidewall 111. The inner diameter of the limiting 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 casing 11 to prevent exposure. The other axial end of the outer shell 11 opposite to the limit baffle 112 is provided with an opening. An inner cavity is formed inside the outer shell 11, a through hole is formed in the limit baffle 112, and the inner cavity is communicated with the opening at the other end of the outer shell 11 and the through hole of the limit baffle 112.

The other end of the outer housing 11 opposite to the limit baffle 112 is provided with a plurality of pressure relief holes 113, more specifically, the plurality of pressure relief holes 113 are formed at the edge of the bottom of the outer sidewall 111 of the outer housing 11, and the plurality of pressure relief holes 113 are distributed at intervals along the bottom periphery of the outer sidewall 111. The pressure relief holes 113 are used for discharging gas generated by the lithium ion battery cell so as to reduce the internal pressure of the battery.

Optionally, the pressure relief holes 113 are disposed at equal intervals along the periphery of the outer housing 11.

Alternatively, the pressure relief holes 113 may be disposed at unequal intervals along the periphery of the outer housing 11.

Alternatively, the pressure relief hole 113 may be a rectangular notch or an arc-shaped notch.

The two pressure relief holes 113 are formed with protrusions 115 welded to the cell casing, and the outer edges of the protrusions 115 contact the cell casing.

Optionally, the pressure relief holes may be circular holes disposed on the outer sidewall 111 of the outer casing 11, that is, the circular holes are not disposed on the bottom edge of the outer sidewall 11 but disposed above the bottom edge, and the circular holes are distributed at intervals along the circumferential direction surrounded by the outer sidewall 111.

The circuit board 13 may have a disk shape with opposing first and

second surfaces

131, 132. The first surface 131 is provided with an electrode cap 15. The electrode cap 15 is exposed out of the outer shell 11 through the through hole of the limiting baffle 112. The second surface 132 has disposed thereon circuit components, which may be components that include charge and/or discharge control.

A ring of housing pads 1311 is further disposed at the edge of the first surface 131, and the housing pads 1311 are connected to the inner surface of the limit stop 112 by reflow soldering. An edge position of the second surface 132 is provided with an inner shell land 1321, and the inner shell land 1321 is welded to the support edge portion 121 of the inner shell 12.

The inner housing 12 is made of metal and is accommodated in the inner cavity of the outer housing 11. The inner housing 12 includes an annular inner side wall 122 and the above-mentioned support edge portion 121 connected to the inner side wall 122 for supporting the circuit board 13. The inner wall 122 is formed in a cylindrical shape. The support edge portion 121 extends in a curved manner in the central axis direction of the inner sidewall 122 to form a support surface for supporting the circuit board 13.

The supporting edge portion 121 includes a plurality of solder feet 1221 formed at the top end of the inner side wall 122 and distributed along the circumferential direction of the inner side wall 122 at intervals, each solder foot 1221 extends in a bending manner toward the central axis of the inner side wall 122 to form a supporting surface for supporting the circuit board 13, and an arc-shaped chamfer is formed between each solder foot 1221 and the inner side wall 122, that is, an arc-shaped transition portion 123 is formed.

First gaps 181 for depositing solder paste are formed between the transition portion 123 and the outer wall 111 and between the transition portion and the inner case lands 1321 of the circuit board 13. A second gap 182 for depositing solder paste is formed between the circuit board 13 and the outer wall 111 of the housing 11, and the first gap 181 and the second gap 182 communicate with each other. When the circuit board 13, the inner case 12, and the outer case 11 are soldered, for example, by reflow soldering, the solder paste applied to the outer case lands 1311 and the inner case lands 1321 of the circuit board 13 flows into the first gaps 181 and the second gaps 182 during heating, and fills the first gaps 181 and the second gaps 182.

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 pad 1311 and the inner housing pad 1321 flows into the gap to fill the gap.

After the solder paste is heated and cured, the outer case land 1311 is connected to the stopper 112 of the outer case 11, and the inner case land 1321 is connected to the support surface of the support edge portion 121 of the inner case 12. After the solder paste is cured, the solder paste supports the circuit board together with the supporting edge portion 121, and since the solder paste has good shear resistance, the supporting edge portion 121 and the solder paste can provide firm support for the circuit board 13 after being bonded.

A recess 124 for accumulating solder paste is formed between the two solder fillets 1221 of the support edge portion 121, and when the solder paste is heated and cured, the solder paste on the outer shell pad 1311 and the inner shell pad 1321 is also pushed into the recess 124. In this manner, the connection between the outer housing 11, the circuit board 13, and the inner housing 12 is further reinforced.

Here, instead of the solder paste, a solder wire or a solder ball may be used, and the gap or the groove may be filled with a molten fluid solder.

Optionally, the welding feet 1211 of the inner housing 12 are disposed at equal intervals along the circular periphery surrounded by the inner wall 122.

Alternatively, the welding feet 1211 of the inner housing 12 may be arranged at unequal intervals.

The bottom of the outer housing 11 exceeds the bottom of the inner housing 12 to form a housing positioning cylindrical structure 114 for positioning the lithium ion battery cell.

The bottom edge of the inner case 12 is higher than the bottom surface of the pressure relief hole 113 so that the inner case 12 does not block the pressure relief hole 113.

In other embodiments, the inner housing 12 may be eliminated and the circuit board 13 may be directly fixed to the inner cavity of the outer housing 11 by soldering.

An electrode cap pad is also provided on the circuit board 13, and the electrode cap pad is connected with the electrode cap 15 by welding. The electrode cap 15 includes a hollow cylindrical cap body 151 and an annular visor 152 formed on the outer periphery of the cap body 151. The electrode cap 15 protrudes from the outer case 11. The electrode cap 15 may be a positive electrode cap or a negative electrode cap, for example, if the negative electrode of the battery cell correspondingly mounted to the dual-casing controller 10 is connected to the outer casing 11, the electrode cap 15 is connected to the positive electrode of the battery cell, and then the electrode cap 15 is a positive electrode cap; on the contrary, if the positive electrode of the battery cell correspondingly installed in the dual-casing controller 10 is connected to the outer casing 11, the electrode cap 15 is connected to the negative electrode of the battery cell, and the electrode cap 15 is the negative electrode cap.

For example, as shown in fig. 1 to 3, the electrode cap 15 may be a positive electrode cap.

For example, as shown in fig. 4 to 6, fig. 4 is an exploded view of the controller in which the electrode cap of the present disclosure is a negative electrode cap, fig. 5 is a cross-sectional view of the controller in which the electrode cap of the present disclosure is a negative electrode cap, and fig. 6 is an exploded schematic view of the negative electrode cap and a circuit board. The controller 10b includes an outer housing 11b, an inner housing 12b, and a circuit board 13b, an electrode cap disposed on the circuit board 13b is a negative electrode cap 15b, and the negative electrode cap 15b is mainly different from the positive electrode cap shown in fig. 1 to 3 in 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 brim of the negative electrode cap. The brim of the negative electrode cap 15b is welded to a plurality of bonding pads 130b on the first surface 131b of the circuit board 13b, the bonding pads 130b surround to form a ring, and the outer diameter of the ring is matched with the outer diameter of the brim of the negative electrode cap 15b, so that the brim of the negative electrode cap 15b is attached to the bonding pads 130 b. The inner diameter of the ring shape is slightly larger than that 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, molten solder paste can extend upwards along the inside of the brim of the negative electrode cap 15b, thereby increasing the soldering strength of the brim of the negative electrode cap 15 b. The structures of the outer housing, the inner housing, and the circuit board of the controller of fig. 4 and 5, and the positional relationship and the connection relationship therebetween may be the same as those of the above-described embodiments of fig. 1 to 3. Here, the overlapping description of the same components and the same structures is omitted.

Referring to fig. 1 and fig. 2, the dual-casing controller 10 further includes an electrode cap insulating sheet 14, the electrode cap insulating sheet 14 is disc-shaped, a through hole 141 is disposed in the middle, a cap body 151 is exposed out of the outer casing 11 through the through hole 141, and the electrode cap insulating sheet 14 covers the limiting baffle 112 and the cap peak 152. The electrode cap insulating sheet 14 separates the electrode cap 151 from the outer case 11 and prevents conduction therebetween.

The second surface 132 of the circuit board 13 is further provided with an inner electrode pad for soldering the inner electrode 16, the inner electrode pad is further provided with an inner electrode positioning hole 134, and the positioning pin 163 of the inner electrode 16 is inserted into the inner electrode positioning hole 134, so that the circumferential positioning of the inner electrode 16 on the circuit board 13 is ensured. The inner electrode 16 includes an electrode strip 161 and an inner electrode circuit board soldering land 164, and the inner electrode circuit board soldering land 164 forms an L-shape with the electrode strip 161. The electrode contact pads 164 abut against the inner electrode pads on the second surface of the circuit board 13 to ensure axial positioning of the inner electrodes 16 on the circuit board 13. The inner electrode circuit board soldering lands 164 increase the contact area of the inner electrodes 16 with the circuit board 13, facilitating the passage of a larger current. Meanwhile, when a current is passed through the internal electrode 16, the amount of heat generation at the connection portion of the internal electrode 16 and the circuit board 13 can be reduced.

The inner electrode 16 is further provided with a bending positioning groove 162, and the bending positioning groove 162 can position a bending position, and can reduce stress concentration, so that the inner electrode 16 is folded at the bending positioning groove 162, and the folding consistency of the inner electrode 16 is ensured.

The movable end 167 of the inner electrode 16 is provided with a resistance welding resistance flow groove 165, so that the current path passing through the inner electrode 16 and the electrode lug boss of the lithium ion battery cell during resistance welding is increased, and the welding strength is increased. The movable end 167 of the inner electrode 16 may be a bar.

Alternatively, when the battery volume is small, the movable end 167 of the inner electrode 16 can be designed into a round cake shape, so as to increase the contact area of the electrode.

The circuit board 13 is provided with a glue injection hole and an exhaust overflow hole. The prepared heat conducting glue is poured into the cavity of the outer shell 11 from the glue injection hole of the circuit board 13 in a vacuum environment, after the heat conducting glue fills the inner cavity formed by the first surface 131 of the circuit board 13 and the electrode cap 15, the air exhaust overflow hole of the circuit board 13 overflows to the cavity formed by the second surface 132 of the circuit board 13 and the outer shell 11 until the heat conducting glue covers the components on the second surface of the whole circuit board 13, and a layer of heat conducting glue layer is formed. The movable end of the inner electrode 16 and most of the electrode strips are exposed to the layer of thermally conductive adhesive.

An inner electrode insulation sheet 17 covers the heat-conducting glue layer, the inner electrode insulation sheet 17 is provided with a gap, one end of the inner electrode 16 is welded on the second surface 132 of the circuit board 13, and the other end of the inner electrode passes through the gap to be overlapped on the inner electrode insulation 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 at the notch of the inner electrode insulation sheet 17 for the first time, and is bent at the bending positioning groove 162 for the second time.

The present disclosure also provides a cylindrical lithium ion rechargeable battery, which may be a No. 5 lithium ion battery or a No. 7 lithium ion battery, as shown in fig. 7 to 9, fig. 7 is an exploded view of the cylindrical lithium ion rechargeable battery, fig. 8 is a schematic structural diagram of the assembled cylindrical lithium ion rechargeable battery, and fig. 9 is a cross-sectional view of the assembled cylindrical lithium ion rechargeable battery. The pillar-shaped lithium ion rechargeable battery 100 includes a lithium ion cell 20 and the controller 10 according to any one of the embodiments of fig. 1 to 3.

The lithium ion cell 20 is filled with an electrolyte, the lithium ion cell 20 is provided with a negative electrode and a positive electrode, and the casing 24 of the lithium ion cell is the negative electrode. The end of the lithium ion cell 20 where the positive electrode is provided is a positive end, and the positive end is provided with a positive electrode boss 21. A cell pressure relief hole 22 is formed in the side wall of the positive electrode boss 21, and gas generated by the lithium ion cell is exhausted through the cell pressure relief hole 22.

The double-casing controller 10 is disposed at the positive terminal of the lithium ion cell 20, and the outer casing 11 thereof is welded to the casing 24 of the lithium ion cell, and more specifically, the outer edge of the protrusion 115 of the outer casing 11 is welded to the casing 24. The pressure relief hole 113 of the outer casing 11 is communicated with the cell pressure relief hole 22, so that gas discharged from the cell pressure relief hole 22 enters the outer casing 11 and is discharged through the pressure relief hole 113 of the outer casing 11, thereby reducing the air pressure inside the lithium ion cell 20.

The movable end 167 of the inner electrode 16 of the double-shell controller 10 is connected with the positive electrode boss 21 in a welding manner.

The periphery of the positive electrode boss 21 of the lithium ion cell 20 is provided with a cell insulation sheet 23, and the cell insulation sheet 23 is annular and used for isolating the inner electrode of the dual-casing controller 10 from contacting with other structural members (such as the casing 24) and avoiding short circuit.

As shown in fig. 8, the bottom of the outer housing 11 of the controller 10 exceeds the bottom of the inner housing 12, the portion of the outer housing 11 that exceeds forms a positioning cylindrical structure 114, the positioning cylindrical structure 114 surrounds a circle of positioning grooves, the top end of the lithium ion battery cell 20 is inserted into the positioning grooves, the positioning cylindrical structure 114 is positioned at the round corner of the housing 24 of the outer Zhou Dijie lithium ion battery cell 20, and a welding seam is formed at the joint seam of the two for welding.

In an embodiment, the present disclosure further provides a cylindrical lithium ion rechargeable battery, specifically, the cylindrical lithium ion rechargeable battery includes a lithium ion cell and the controller 10 described in any one of the embodiments of fig. 4 to 5, the lithium ion cell is filled with an electrolyte, and the lithium ion cell has a positive electrode and a negative electrode. The shell of the lithium ion battery cell is a positive electrode. The lithium ion battery cell is provided with a negative electrode as a negative electrode end, the negative electrode end is provided with a negative electrode boss, and the negative electrode boss is electrically connected with the negative electrode.

The controller 10 is arranged at the negative electrode end of the lithium ion cell, and the inner electrode of the controller 10 is electrically connected with the negative electrode lug boss of the lithium ion cell. The controller case of the controller 10 is connected to the case of the lithium ion battery cell, so that the controller case is electrically connected to the lithium ion battery positive electrode.

The negative end of the lithium ion battery cell is provided with a plurality of cell pressure relief holes.

Further, in the above-described embodiment, the controller case includes the outer case and the inner case. In one embodiment, the controller housing may also include only an outer housing, in which case the circuit board may be fixed by welding the limit baffle of the outer housing to the housing pad of the circuit board.

The above description is only for the purpose of illustrating the preferred embodiments of the present disclosure and is not to be construed as limiting the scope of the present disclosure, but rather is intended to cover all equivalent structural changes made by applying the teachings of the present disclosure to the accompanying drawings.

Claims

1. A controller, comprising:

2. The controller of claim 1, wherein the pressure relief holes are formed in the bottom edge of the side wall of the controller housing, and the pressure relief holes are distributed at intervals along the bottom periphery of the controller housing.

3. The controller of claim 2, wherein the pressure relief hole is a rectangular notch or an arcuate notch.

4. The controller of claim 1, wherein the plurality of pressure relief holes are circular holes spaced apart along a circumference of the controller housing.

5. The controller according to claim 1, wherein the controller housing comprises a housing body, the housing body comprises a cylindrical outer side wall and an axial limiting baffle plate which is formed at one end of the outer side wall and is perpendicular to the outer side wall, a through hole is formed in the center of the limiting baffle plate, the electrode cap is exposed out of the housing through the through hole, and the pressure relief hole is formed in one end, far away from the limiting baffle plate, of the outer side wall.

6. The controller according to claim 5, wherein the controller case further includes an inner case, the inner case is housed in the inner chamber, a support edge portion for supporting the circuit board is formed at one end of the inner case, the outer case and the inner case are connected by soldering, and the circuit board and the support edge portion of the inner case are connected by soldering.

7. The controller of claim 6, wherein the bottom of the outer housing extends beyond the bottom of the inner housing to form a positioning cylindrical structure for positioning the housing of the lithium ion cell.

8. The controller of claim 6, wherein the circuit board comprises a first surface and a second surface which are arranged oppositely, the first surface is provided with a housing welding pad, and the housing welding pad is welded with a limit baffle of the housing body;

9. A cylindrical lithium ion rechargeable battery, comprising:

the lithium ion battery pack comprises a lithium ion battery cell, a battery cover and a battery cover, wherein the lithium ion battery cell is provided with a positive electrode and a negative electrode, and a shell of the lithium ion battery cell is the negative electrode;

the controller of claims 1-8, the controller being mounted at a positive electrode end of the lithium ion cell, an inner electrode of the controller being connected to the positive electrode of the lithium ion cell, a controller housing of the controller being connected to the housing of the lithium ion cell.

10. The cylindrical lithium ion rechargeable battery according to claim 9, wherein the positive terminal of the lithium ion cell is provided with a plurality of cell pressure relief holes, and the cell pressure relief holes are communicated with the pressure relief holes of the controller.

11. The cylindrical lithium-ion rechargeable battery according to claim 10, wherein the controller case is connected to the case of the lithium-ion cell by welding.

12. A cylindrical lithium ion rechargeable battery, comprising:

the lithium ion battery pack comprises a lithium ion battery cell, a battery cover and a battery cover, wherein the lithium ion battery cell is provided with a positive electrode and a negative electrode, and a shell of the lithium ion battery cell is the positive electrode;

the controller of claims 1-8, the controller mounted on a negative electrode end of the lithium ion cell, an inner electrode of the controller connected to the negative electrode of the lithium ion cell, a controller housing of the controller connected to a housing of the lithium ion cell.

13. The cylindrical lithium ion rechargeable battery according to claim 12, wherein the negative end of the lithium ion cell is provided with a plurality of cell pressure relief holes.

14. The cylindrical lithium ion rechargeable battery of claim 13, wherein the controller housing is connected to the housing of the lithium ion cell by welding.