Discharge control method, charging control method of rechargeable battery, and rechargeable battery

Abstract

A discharge control method, a charge control method and a rechargeable battery of a rechargeable battery. The electrical system of the rechargeable battery includes a lithium-ion battery cell and a discharge control circuit, and may also include a charge control circuit. The positive electrode of the lithium-ion battery cell is electrically connected to the common ground terminal of the charge and / or discharge control circuit, so that the common ground terminal serves as the positive electrode for the rechargeable battery's charge input and / or discharge output. The negative electrode of the lithium-ion battery cell is electrically connected to the output terminal of the charge control circuit and the input terminal of the discharge control circuit. The input terminal of the charge control circuit and the output terminal of the discharge control circuit are electrically connected to the negative electrode of the rechargeable battery. The rechargeable battery discharges externally by controlling the voltage of the negative electrode of the lithium-ion battery cell, and charges the lithium-ion battery cell by controlling the voltage and / or current of the negative electrode of the rechargeable battery, thereby simplifying the structure of the rechargeable battery, creating more space for the lithium-ion battery cell, and improving the volume energy density of the lithium-ion battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and particularly to a method for controlling discharge of a rechargeable battery, a method for controlling charging, and a rechargeable battery. Background Art

[0002] Cylindrical primary batteries standardized by GB / T 8897.2 (IEC 60086-2) have been widely used in the fields of handheld or portable electronic and electrical products. Since primary batteries cannot be reused, and there are problems such as high battery usage costs and environmental pollution caused by waste batteries, the consumer market has an increasing demand for secondary battery products that can replace the standardized primary batteries of GB / T 8897.2 (IEC 60086-2). In the field of rechargeable battery products that are compatible with the standardized primary batteries of GB / T 8897.2 (IEC 60086-2), products such as nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries have emerged one after another. However, these rechargeable battery products have technical problems that cannot satisfy consumers in terms of discharge voltage compatibility, memory effect, charging rate, abuse tolerance, cycle life, etc.

[0003] The performance of lithium-ion rechargeable batteries in terms of specific energy, charge-discharge memory effect, charging rate, abuse tolerance, cycle life, etc. is much better than that of secondary batteries such as nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. It has gradually replaced other secondary batteries in product fields such as consumer electronics and electrical power sources, energy storage power sources, and power sources for vehicles. However, the discharge voltage of lithium-ion rechargeable batteries is not compatible with the nominal voltage of primary batteries defined by the GB / T 8897.2 (IEC 60086-2) standard, and they must be charged and discharged under the control of a charge-discharge control management circuit.

[0004] Therefore, existing lithium-ion rechargeable batteries basically include two parts, namely, a lithium-ion battery cell and a controller. The controller has a discharge control circuit inside, and its main function is to control the discharge voltage of the lithium-ion battery cell so that the discharge voltage of the rechargeable battery is compatible with the nominal voltage of the primary battery defined by the GB / T 8897.2 (IEC 60086-2) standard. Some rechargeable batteries also integrate the charge control circuit into the controller, so that each rechargeable battery has an independent charge-discharge circuit.

[0005] However, the layout of the controller of existing rechargeable batteries is limited by the control method of the existing charge and / or discharge circuit, resulting in most of the controllers of existing rechargeable batteries being arranged at the positive electrode end of the lithium-ion battery cell. Otherwise, it will lead to a complex structure of the rechargeable battery, affect the volume specific energy of the lithium-ion battery cell, reduce the battery power, and reduce the battery performance. Summary of the Invention

[0006] In view of the above problems, the present invention provides a method for controlling the discharge of a rechargeable battery, which is applied to the electrical system of the rechargeable battery. The electrical system includes a lithium-ion battery cell and a discharge control circuit. The discharge control method includes:

[0007] Electrically connect the positive electrode of the lithium-ion battery cell to the common ground terminal of the discharge control circuit, and use the common ground terminal as the positive electrode for discharging the rechargeable battery output.

[0008] Electrically connect the negative electrode of the lithium-ion battery cell to the input terminal of the discharge control circuit, convert it into a set negative electrode discharge voltage through the discharge control circuit, and output it outward through the output electrode. The output electrode serves as the negative electrode for discharging the rechargeable battery output.

[0009] For the above-mentioned method for controlling the discharge of a rechargeable battery, wherein,

[0010] When the discharge control circuit detects that an external charging power source is not connected to the rechargeable battery or detects that the connection between the external charging power source and the rechargeable battery is disconnected, the discharge control circuit controls the rechargeable battery to enter the discharge state;

[0011] When the rechargeable battery is in the discharge state, when the absolute value of the voltage of the lithium-ion battery cell is higher than the set discharge cut-off voltage, the discharge control circuit allows the lithium-ion battery cell to discharge externally by controlling the negative electrode discharge voltage of the lithium-ion battery cell;

[0012] When the rechargeable battery is in the discharge state, when the absolute value of the voltage of the lithium-ion battery cell is equal to or lower than the discharge cut-off voltage, the discharge control circuit stops the lithium-ion battery cell from discharging externally by turning off the negative electrode discharge of the lithium-ion battery cell.

[0013] In view of the above problems, the present invention also provides a method for controlling the charging of a rechargeable battery, which is applied to the rechargeable battery itself or an electrical system independent of the rechargeable battery externally. The electrical system includes a charging control circuit, and the rechargeable battery includes a lithium-ion battery cell. The charging control method includes:

[0014] Electrically connect the positive electrode for charging the rechargeable battery to the common ground terminal of the charging control circuit, and use the common ground terminal as the positive electrode for charging the rechargeable battery input;

[0015] Electrically connect the negative electrode for charging the rechargeable battery to the input terminal of the charging control circuit, so that the charging control circuit controls the input voltage and / or current connected to the negative electrode of the rechargeable battery and outputs it to the negative electrode of the lithium-ion battery cell to charge the lithium-ion battery cell.

[0016] For the above-mentioned method for controlling the charging of a rechargeable battery, wherein,

[0017] When the charging control circuit detects that an external charging power source is connected to the rechargeable battery, the charging control circuit controls the rechargeable battery to enter the charging state;

[0018] When the rechargeable battery is in a charging state, the charging control circuit detects the voltage of the lithium-ion battery cell and, based on the voltage state of the lithium-ion battery cell, controls the charging of the lithium-ion battery cell by controlling the input voltage and / or current of the negative electrode of the lithium-ion battery cell, and turns off the charging of the lithium-ion battery cell after the lithium-ion battery cell is fully charged or the rechargeable battery is disconnected from the external charging power source.

[0019] The charging control method of the rechargeable battery described above, wherein,

[0020] In a state where an external charging power source is connected to the rechargeable battery, the charging control circuit detects the voltage of the external power source, and when the voltage of the external power source meets the charging conditions, the charging control circuit starts charging the lithium-ion battery cell;

[0021] When the voltage of the external charging power source does not meet the charging conditions, the charging control circuit stops charging the lithium-ion battery cell.

[0022] In view of the above problems, the present invention further provides a rechargeable battery, which includes: a lithium-ion battery cell and a controller installed at one end of the negative electrode of the lithium-ion battery cell, and the controller includes: a circuit board, on which a discharge control circuit and a negative electrode end cover are arranged;

[0023] The common ground terminal of the discharge control circuit is electrically connected to the positive electrode of the lithium-ion battery cell;

[0024] The negative electrode end cover is welded to the circuit board, and the negative electrode end cover is electrically connected to the discharge output terminal of the discharge control circuit by welding;

[0025] The discharge control circuit has a discharge input terminal, and the negative electrode of the lithium-ion battery cell is welded and electrically connected to the discharge input terminal;

[0026] The positive electrode of the lithium-ion battery cell serves as the positive electrode of the rechargeable battery, and the negative electrode end cover serves as the negative electrode of the rechargeable battery.

[0027] Optionally, an internal electrode is also welded on the circuit board, the negative electrode end cover and the internal electrode are respectively arranged on the opposite first surface and second surface of the circuit board, and the internal electrode is electrically connected to the discharge input terminal of the discharge control circuit by welding, so that the internal electrode becomes the access electrode for the negative electrode of the lithium-ion battery cell to access the controller.

[0028] Optionally, a controller housing is arranged around the controller, the circuit board is located in the controller housing, and the controller housing is electrically connected to the common ground terminal of the discharge control circuit by welding.

[0029] Optionally, the outer wall of the lithium-ion battery cell has a battery housing made of a conductive material, and the battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; one end of the battery housing is electrically connected to the controller housing by welding, so that the battery housing is electrically connected to the positive electrode of the lithium-ion battery cell, the controller housing, and the common ground terminal of the discharge control circuit.

[0030] Optionally, the lithium-ion battery cell is placed in a battery housing made of a conductive material, and the battery housing has a structure with one end open and the other end closed, and a positive electrode cap is provided at the closed end. The battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; a cell cap housing is provided at the open end of the battery housing, and the controller housing is fixedly welded to the battery housing through the cell cap housing to establish an electrical connection.

[0031] Optionally, the lithium-ion battery cell is placed in a battery housing made of a conductive material, and the battery housing has a structure with one end open and the other end closed, and a positive electrode cap is provided at the closed end. The battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; the controller is arranged at the open end of the battery housing, and the controller housing is welded to the battery housing to establish an electrical connection.

[0032] Optionally, a charging control circuit is further arranged on the circuit board, and the common ground terminal of the charging control circuit is electrically connected to the common ground terminal of the discharge control circuit; the charging input terminal of the charging control circuit is electrically connected to the discharge output terminal of the discharge control circuit, and then is electrically connected to the negative electrode end cap; the charging output terminal of the charging control circuit is electrically connected to the discharge input terminal of the discharge control circuit, and then is electrically connected to the negative electrode of the lithium-ion battery cell.

[0033] The embodiments of the present disclosure have the following technical effects:

[0034] The present disclosure provides a method for controlling the charging and discharging of a rechargeable battery. Different from the existing charging and discharging control circuits that control charging or discharging by controlling the positive voltage or positive current, this charging and discharging control method electrically connects the positive electrode of the lithium-ion battery cell to the common ground terminal of the charging and / or discharging control circuit of the rechargeable battery, and discharges externally by controlling the voltage of the negative electrode of the lithium-ion battery cell, or charges the lithium-ion battery cell by controlling the voltage or current of the negative electrode of the rechargeable battery.

[0035] A rechargeable battery designed according to the charge and discharge control method of the rechargeable battery of the present disclosure, wherein the controller is arranged at the negative electrode end of the lithium-ion cell, and the charge and discharge control circuit in the controller directly takes power from the negative electrode of the lithium-ion cell or the negative electrode of the rechargeable battery and controls the negative voltage or current, simplifying the connection structure between the lithium-ion cell and the controller, creating more space for the lithium-ion cell, and improving the volumetric energy density of the lithium-ion cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the external shape of one end of the positive electrode of the rechargeable battery for Example 1;

[0037] Figure 2 Schematic diagram of the external shape of one end of the negative electrode of the rechargeable battery for Example 1;

[0038] Figure 3 Schematic diagram of the sectional structure of the rechargeable battery for Example 1;

[0039] Figure 4 Exploded view of the structure of the rechargeable battery for Example 1;

[0040] Figure 5 Schematic diagram of the structure of the positive electrode welding extension of the soft-pack lithium-ion cell of the rechargeable battery for Example 1;

[0041] Figure 6 Schematic diagram of the structure of the positive and negative electrodes bending of the soft-pack lithium-ion cell of the rechargeable battery for Example 1;

[0042] Figure 7 Schematic diagram of the structure of the soft-pack lithium-ion cell of the rechargeable battery for Example 1 being put into a case and the positive electrode being welded to the battery housing;

[0043] Figure 8 Schematic diagram of the welding structure between the negative electrode of the soft-pack lithium-ion cell of the rechargeable battery for Example 1 and the electrode in the controller;

[0044] Figure 9 Schematic diagram of the external shape of one end of the positive electrode of the rechargeable battery for Example 2;

[0045] Figure 10 Schematic diagram of the external shape of one end of the negative electrode of the rechargeable battery for Example 2;

[0046] Figure 11 Schematic diagram of the sectional structure of the rechargeable battery for Example 2;

[0047] Figure 12 Exploded view of the structure of the rechargeable battery for Example 2;

[0048] Figure 13 Schematic diagram of the sectional structure of the aluminum-shell lithium-ion cell of the rechargeable battery for Example 2;

[0049] Figure 14 Schematic diagram of the structural decomposition of the aluminum-shell lithium-ion battery cell of Example 2;

[0050] Figure 15 Schematic diagram of the decomposition of the aluminum-shell lithium-ion battery cell and the insulating layer of the rechargeable battery of Example 2;

[0051] Figure 16 Schematic diagram of the decomposition of the controller and the insulating layer of the rechargeable battery of Example 2;

[0052] Figure 17 Schematic diagram of the structure where the inner electrode of the rechargeable battery of Example 2 is welded to the negative electrode of the aluminum-shell lithium-ion battery cell;

[0053] Figure 18 Schematic diagram of the outer shape of one end of the positive electrode of the rechargeable battery of Example 3;

[0054] Figure 19 Schematic diagram of the outer shape of one end of the negative electrode of the rechargeable battery of Example 3;

[0055] Figure 20 Schematic diagram of the internal structure cross-section of the rechargeable battery of Example 3;

[0056] Figure 21 Schematic diagram of the structural decomposition of the rechargeable battery of Example 3;

[0057] Figure 22 Schematic diagram of the welding of the negative electrode of the direct-sealed lithium-ion battery cell and the inner electrode of the controller of the rechargeable battery of Example 3;

[0058] Figure 23a Schematic diagram of the outer shape of the rechargeable battery of Example 4;

[0059] Figure 23b Schematic diagram of the structural decomposition of the rechargeable battery of Example 4;

[0060] Figure 23c Schematic diagram of the welding of the negative electrode of the CID lithium-ion battery cell and the inner electrode of the controller of the rechargeable battery of Example 4;

[0061] Figure 24a Circuit principle block diagram of the rechargeable battery;

[0062] Figure 24b Charge and discharge principle block diagram of the rechargeable battery;

[0063] Figure 25 Schematic diagram of the structure of the first surface of the circuit board of the rechargeable battery of Example 1;

[0064] Figure 26Schematic diagram of the structure of the second surface of the circuit board of the rechargeable battery in Example 1;

[0065] Figure 27 Schematic diagram of the structure for soldering the inner electrode of the controller of the rechargeable battery in Example 1 to the circuit board;

[0066] Figure 28 Schematic diagram of the structure for soldering the negative electrode end cap of the controller of the rechargeable battery in Example 1 to the circuit board;

[0067] Figure 29 Cross-sectional schematic diagram after the assembly of the controller of the rechargeable battery in Example 1 is completed;

[0068] Figure 30 Exploded schematic diagram of the assembly of the controller of the rechargeable battery in Example 1;

[0069] Figure 31 Schematic diagram of the structure for soldering the inner electrode of the controller of the rechargeable battery in Example 2 to the circuit board;

[0070] Figure 32 Schematic diagram of the structure for soldering the negative electrode end cap of the controller of the rechargeable battery in Example 2 to the circuit board;

[0071] Figure 33 Schematic diagram of the structure for soldering the controller housing of the controller of the rechargeable battery in Example 2 to the circuit board;

[0072] Figure 34 Cross-sectional view after the assembly of the controller of the rechargeable battery in Example 2 is completed;

[0073] Figure 35 Exploded schematic diagram of the assembly of the controller of the rechargeable battery in Example 2;

[0074] Figure 36 Schematic diagram of the soldering of the inner electrode of the controller of the rechargeable battery in Example 3 to the circuit board;

[0075] Figure 37 Schematic diagram of the structure for assembling the soldering of the negative electrode end cap of the controller of the rechargeable battery in Example 3 to the circuit board;

[0076] Figure 38 Schematic diagram of the soldering of the controller housing assembly of the controller of the rechargeable battery in Example 3;

[0077] Figure 39 Cross-sectional schematic diagram after the soldering of the controller of the rechargeable battery in Example 3 is completed; and

[0078] Figure 40 Exploded schematic diagram of the assembly of the controller of the rechargeable battery in Example 3. Detailed Implementation Modes

[0079] Although the present invention can be easily embodied in different forms of embodiments, only some specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as a demonstrative illustration of the principles of the present disclosure, and is not intended to limit the present invention to what is described herein.

[0080] Therefore, a feature pointed out in this specification will be used to illustrate one of the features of an embodiment of the present disclosure, rather than implying that each embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0081] In the embodiments shown in the drawings, the indication of directions (such as up, down, left, right, front and back) is used to explain that the structures and movements of various components of the present invention are not absolute but relative. When these components are in the positions shown in the drawings, these explanations are appropriate. If the description of the positions of these components changes, then the indication of these directions also changes accordingly.

[0082] Now, example embodiments will be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present disclosure will be more complete and comprehensive, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0083] The following further elaborates in detail the preferred embodiments of the present invention in conjunction with the drawings of this specification.

[0084] This application takes the specific structural embodiments of four rechargeable batteries and the charge and discharge control method of one rechargeable battery as examples to illustrate the integrated structure of the rechargeable battery integrated system and the control methods for charging and discharging rechargeable batteries.

[0085] Embodiment 1: Embodiment of a pouch lithium-ion battery (i.e., a pouch lithium-ion cell rechargeable battery)

[0086] Taking the rechargeable battery 100a composed of a pouch lithium-ion cell as an example, the structural features of the battery of the present disclosure are described. This embodiment is applicable to rechargeable batteries of different models composed of pouch lithium-ion cells, such as No. 5 batteries, No. 7 batteries, No. 3 batteries, etc.

[0087] Refer to Figures 1 to 8 , the rechargeable battery 100a includes a pouch-type lithium-ion battery cell 200a and a controller 400a for controlling charging and discharging.

[0088] Specifically, the rechargeable battery 100a (i.e., the pouch-type lithium-ion battery) includes a cylindrical battery housing 110a, a lithium-ion battery cell 200a installed in the battery housing 110a, a positive electrode cap provided at one end of the battery housing 110a, and a controller 400a provided at the other end of the battery housing opposite to the positive electrode cap. Among them, the positive electrode cap is a closed-end boss 112a formed at one end of the battery housing 110a.

[0089] The pouch-type lithium-ion battery cell 200a is internally filled with an electrolyte and is sealed with an insulating film on the surface. Opposite ends of the pouch-type lithium-ion battery cell 200a respectively have a positive electrode 210a and a negative electrode 220b exposed outside the cell package.

[0090] In this embodiment, the positive electrode of the pouch-type lithium-ion battery cell 200a is bent and extended towards the negative electrode end to the open end of the battery housing 110a, and is welded and fixed to the battery housing 110a at the open end to establish an electrical connection. The purpose of extending the positive electrode of the pouch-type lithium-ion battery cell 200a is to facilitate welding and fixing the positive electrode of the pouch-type lithium-ion battery cell 200a to the battery housing 110a.

[0091] As Figure 6 shown, the positive electrode 210a abuts against the pouch-type lithium-ion battery cell 200a and is bent towards the negative electrode of the pouch-type lithium-ion battery cell 200a. The positive electrode 210a extends to the end where the negative electrode 220a of the pouch-type lithium-ion battery cell 200a is located after bending. The negative electrode 220a of the pouch-type lithium-ion battery cell 200a is bent towards the negative electrode end face of the pouch-type lithium-ion battery cell 200a. The positive electrode 210a includes an original part directly extending from the pouch-type lithium-ion battery cell 200a and an extended part. The extended part is a metal sheet made of the same material as the original part by stamping and is welded to the original part by ultrasonic welding or resistance welding or laser welding.

[0092] It is worth mentioning that in other embodiments, the positive electrode of the pouch-type lithium-ion battery cell 200a may not be extended, and other connection methods may be used to fix and establish an electrical connection between the positive electrode of the pouch-type lithium-ion battery cell 200a and the battery housing 110a or the positive electrode cap, or other methods may be used to introduce the positive electrode of the pouch-type lithium-ion battery cell 200a into the common ground terminal of the charge and discharge control circuit of the controller 400a.

[0093] For the specific structure of the controller 400a, refer to Figures 25 to 30 .

[0094] Refer toFigure 29 and Figure 30 A controller housing 410a is provided around the controller 400a. An inner electrode 340a is provided at one axial end of the controller 400a, and a negative electrode end cap 330a is provided at the other end. A circuit board 300a is provided inside the controller 400a. The inner electrode 340a is welded to the second surface of the circuit board 300a and electrically connected to the circuit board 300a. The negative electrode end cap 330a is welded to the first surface of the circuit board 300a and electrically connected to the circuit board 300a.

[0095] Refer to Figure 25 and Figure 26 The circuit board 300a has opposite first and second surfaces. FIG. 24 shows the first surface of the circuit board 300a. Figure 25 The second surface of the circuit board 300a is shown. As shown in FIGS. 24, Figure 25 Electronic components that make up the charge and discharge control circuit are welded to the first and second surfaces of the circuit board 300a respectively. A first pad 321a (i.e., the controller housing pad), a second pad 322a (i.e., the negative electrode end cap pad), and a third pad 323a (i.e., the inner electrode pad) are provided on the second surface of the circuit board 300a. The first pad 321a is electrically connected to the common ground terminal of the charge and discharge control circuit and the positive electrode P of the charge input and discharge output of the charge and discharge control circuit. The second pad 322a is electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The third pad 323a serves as the negative electrode 220b of the soft-pack lithium-ion battery cell 200a of the charge and discharge control circuit to access the electrode.

[0096] As Figure 26 and Figure 27 shown, the inner electrode 340a is provided on the second surface of the circuit board 300a and is electrically connected to the circuit board 300a. The inner electrode 340 includes an inner electrode contact table 342a parallel to the circuit board and inner electrode welding and positioning feet 341a connected to the inner electrode contact table 342a. The inner electrode welding and positioning feet 341a are fixed on the circuit board 300a and are electrically connected to the circuit board 300a. Specifically, the circuit board 300a is provided with an inner electrode positioning hole 305a penetrating the first and second surfaces. A third pad 323a is provided on the second surface of the circuit board 300a around the inner electrode positioning hole 305a. The inner electrode 340a is positioned by inserting the inner electrode welding and positioning feet 341a into the inner electrode positioning hole 305a, and the inner electrode welding and positioning feet 341a are welded to the circuit board 300a through the third pad 323a to establish an electrical connection.

[0097] As Figure 25 and Figure 28As shown, the negative electrode end cap 330a is made of a metal conductive material, which is electrically connected to the circuit board 300a and disposed on the first surface of the circuit board 300a. The negative electrode end cap 330a includes a circular hollow cap body with one end open and a negative electrode end cap welding and positioning leg 331a integrally extended from the cap body. The negative electrode end cap welding and positioning leg 331a is fixed on the circuit board 300a and electrically connected to the circuit board 300a. Specifically, the circuit board 300a is provided with a positioning groove 304a penetrating through the first surface and the second surface, and a second pad 322a is disposed around the positioning groove 304a on the second surface of the circuit board 300a. The negative electrode end cap 330a is positioned by inserting the negative electrode end cap welding and positioning leg 331a into the positioning groove 304a, and the negative electrode end cap welding and positioning leg 331a is welded to the circuit board 300a through the second pad 322a to establish an electrical connection.

[0098] As Figure 30 shown, the controller housing 410a is provided with an inner cavity. The circuit board 300a is housed in the inner cavity, and the controller housing 410a is electrically connected to the circuit board 300a. The first surface of the circuit board 300a faces the top of the controller housing 410a, and the negative electrode end cap 330a protrudes from the top opening of the controller housing 410a. The second surface of the circuit board 300a faces the bottom of the controller housing 410a, and a through hole is provided at the bottom of the controller housing 410a, and the inner electrode 340a is exposed through the through hole to be electrically connected to the negative electrode 220a of the soft-pack lithium-ion battery cell 200a.

[0099] The controller housing 410a includes a cylindrical side wall 413a and a bottom wall 414a formed at one axial end of the side wall 413a and perpendicular to the side wall 413a. The circuit board 300a is mounted in the inner cavity surrounded by the side wall 413a. A limiting boss made of a conductive metal material protrudes from the inner surface of the side wall 413a. The limiting boss is an annular platform integrally protruding and formed on the inner surface of the side wall 413a. The annular platform has an annular supporting plane protruding from the inner surface of the side wall 413a for supporting the circuit board. The supporting plane and the side wall 413a form an annular inner positioning groove 412a with an L-shaped axial cross section. A through hole is provided at the center of the bottom wall 414a, and the inner electrode contact platform 342a of the inner electrode 340a is exposed outside the controller housing 410a through the through hole. There is a gap between the edge of the inner electrode contact platform 342a and the edge of the through hole. The other end of the controller housing 410a opposite to the bottom wall 414a is a cylindrical open end.

[0100] As Figure 26 and Figure 30As shown, a plurality of first pads 321a are provided around the edge of the circuit board 300a. When the circuit board 300a is mounted on the limiting boss, the first surface of the circuit board 300a is flush with the end face of the open end of the controller housing 410a, and the second surface of the circuit board 300a is in contact welding with the limiting boss 415a through the first pads 321a, thereby establishing an electrical connection with the controller housing 410a.

[0101] As Figure 29 and Figure 30 shown, the controller 400a further has a controller cover plate 460a. The controller cover plate 460a surrounds the outer periphery of the negative electrode end cover 330a and covers the first surface of the circuit board 300a, and the controller cover plate 460a is made of an insulating material to insulate and protect the circuit components on the first surface of the circuit board 300a that are exposed outside the negative electrode end cover 330a.

[0102] The first pads 321a of the circuit board 300a are electrically connected to the common ground terminal GND of the charge and discharge control circuit. The first pads 321a of the circuit board 300a and the controller housing 410a are electrically connected by welding, so that the controller housing 410a is electrically connected to the common ground terminal GND of the charge and discharge control circuit.

[0103] The second pads 322a of the circuit board 300a are electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The negative electrode end cover 330a is welded to the second pads 322a of the circuit board 300a and an electrical connection is established, so that the negative electrode end cover 330a serves as the negative electrode N of the charge input and discharge output of the charge and discharge control circuit.

[0104] The third pads 323a of the circuit board 300a serve as the access electrodes for the negative electrode 220a of the soft-pack lithium-ion battery cell 200a of the charge and discharge control circuit. The inner electrode 340a is welded to the third pads 323a of the circuit board 300a and an electrical connection is established, so that the inner electrode 340a serves as the access electrode for the negative electrode 220a of the soft-pack lithium-ion battery cell 200a of the charge and discharge control circuit.

[0105] Therefore, the negative electrode end cover 330a, the inner electrode 340a, and the controller housing 410a constitute the three structural electrodes of the controller 400a.

[0106] Figure 7 、 Figure 8 is the assembly drawing of the rechargeable battery 100a, where Figure 7 is the assembly drawing of the soft-pack lithium-ion battery cell 200a and the battery housing 110a, Figure 8 is the assembly drawing of the controller 400a, the soft-pack lithium-ion battery cell 200a, and the battery housing 110a.

[0107] As Figure 7As shown, the soft-pack lithium-ion battery cell 200a is inserted into the battery housing 110a with the positive electrode 210a facing the closed end of the battery housing 110a. After that, the positive electrode 210a is welded to the battery housing 110a, making the battery housing 110a the positive electrode for charging input and discharging output of the rechargeable battery 100a.

[0108] As Figure 8 shown, the controller 400a is installed at the open end of the battery housing 110a. The controller housing 410a of the controller 400a is welded and electrically connected to the battery housing 110a, and the internal electrode 340a of the controller 400a is electrically connected to the negative electrode 220a of the soft-pack lithium-ion battery cell.

[0109] After the rechargeable battery 100a is welded and assembled, the internal electrode 340a serves as the negative electrode of the soft-pack lithium-ion battery cell 200a and is connected to the access electrode of the controller 400a. The negative electrode end cap 330a serves as the negative electrode for charging input and discharging output of the rechargeable battery 100a. The battery housing 110a becomes the positive electrode for charging input and discharging output of the rechargeable battery 100a and the common ground terminal of the charge and discharge control circuit.

[0110] Embodiment 2: Embodiment of Aluminum-Cased Lithium-Ion Battery

[0111] Taking the embodiment of the rechargeable battery 100b composed of an aluminum-cased lithium-ion battery cell as an example, the structural features of the aluminum-cased lithium-ion battery of the present disclosure are described. This embodiment is applicable to rechargeable batteries of different models composed of aluminum-cased lithium-ion battery cells, such as No. 5 batteries, No. 7 batteries, No. 3 batteries, etc.

[0112] As Figure 9 and Figure 10 shown, the rechargeable battery 100b (i.e., aluminum-cased lithium-ion battery) is composed of an aluminum-cased lithium-ion battery cell 200b. The internal structure of the rechargeable battery 100b is as Figure 11 shown, and the assembly relationship is as Figure 12 shown.

[0113] Combining Figure 13 and Figure 14 shown, the rechargeable battery 100b (i.e., aluminum-cased lithium-ion battery) includes a cylindrical battery housing 110b, an aluminum-cased lithium-ion battery cell 200b installed in the battery housing 110b, a positive electrode cap 120b connected to one end of the battery housing 110b, and a controller 400b (i.e., battery controller) provided at the other end of the battery housing opposite to the positive electrode cap 120b.

[0114] The battery outer casing 110b is made of aluminum. One end of the battery outer casing 110b forms a closed-end boss 112b, and the closed-end boss 112b is connected to the positive electrode cap 120b. The shape of the positive electrode cap 120b is adapted to the shape of the closed-end boss 112b so that the positive electrode cap 120b can be sleeved on the closed-end boss 112b. By means of interference fit extrusion assembly, the positive electrode cap 120b is assembled and fixed on the closed-end boss 112b of the battery outer casing 110b, so that the positive electrode cap 120b is assembled and fixed with the battery outer casing 110b and an electrical connection is established. The positive electrode cap 120b serves as the positive electrode for charging input and discharging output, and the negative electrode end cover 330b of the controller 400b serves as the negative electrode for charging input and discharging output.

[0115] Combined Figure 14 and Figure 15 As shown, the aluminum-shell lithium-ion battery cell 200b includes an aluminum-shell lithium-ion battery cell core 201b and a cell cap 230b. The aluminum-shell lithium-ion battery cell core 201b is filled with electrolyte inside. The aluminum-shell lithium-ion battery cell core 201b is welded in the battery outer casing 110b, and the battery outer casing 110b and the cell cap 230b jointly complete the encapsulation of the aluminum-shell lithium-ion battery cell core 201b, thereby forming the aluminum-shell lithium-ion battery cell 200b.

[0116] The opposite ends of the aluminum-shell lithium-ion battery cell core 201b respectively have a positive electrode 210b and a negative electrode exposed outside the cell encapsulation.

[0117] The cell cap 230b is arranged at the open end of the battery outer casing 110b and closes the opening of the battery outer casing 110b. The cell cap 230b includes a circular cell cap housing 231b in the shape of a flat-bottomed cap and a lead electrode 232b made of a conductive material riveted on the cell cap housing 231b.

[0118] The cell cap housing 231b includes a circular bottom 2311b and a rim 2312b surrounding the circumference of the bottom 2311b. The lead electrode 232b is riveted at the center of the bottom 2311b and penetrates through the bottom 2311b. The battery outer casing 110b is made of aluminum, the bottom 2311b of the cell cap housing 231b is made of an insulating material, the rim 2312b is made of a conductive material, and the rim 2312b connects the battery outer casing 110b and the controller housing 410b of the controller 400b. One side of the lead electrode 232b exposed outside the cell cap housing 231b is electrically connected to the negative electrode of the aluminum-shell lithium-ion battery cell core 201b.

[0119] The cell cap housing 231b is provided with a flange structure for assembling with the controller 400b, and through this flange structure, the controller 400b is sleeved with the cell cap 230b.

[0120] The cell cap 230b is installed at the open end of the battery housing 110b. The cell cap housing 231b is welded to the battery housing 110b as a whole and electrically connected. After the aluminum-shell lithium-ion cell 200b is welded and assembled, the cell cap housing 231b becomes a part of the battery housing 110b, and the lead-out electrode 232b of the cell cap housing 231b becomes the negative electrode 220b of the aluminum-shell lithium-ion cell 200b.

[0121] For the specific structure of the controller 400b, please refer to Figures 31 to 35 .

[0122] Refer to Figure 34 and Figure 35 . The controller 400b is peripherally provided with a controller housing 410b. One axial end of the controller 400b is provided with an inner electrode 340b, and the other end is provided with a negative electrode end cap 330b. The controller 400b is internally provided with a circuit board 300b. The inner electrode 340b is welded to the second surface of the circuit board 300b and electrically connected to the circuit board 300b. The negative electrode end cap 330b is welded to the first surface of the circuit board 300b and electrically connected to the circuit board 300b.

[0123] As shown in Figure 31 and Figure 32 , electronic components constituting the charge and discharge control circuit are respectively welded on the first surface and the second surface of the circuit board 300b. On the second surface of the circuit board 300b, there are provided a first pad 321b (i.e., the controller housing pad), a second pad 322b (i.e., the negative electrode end cap pad), and a third pad 323b (i.e., the inner electrode pad). The first pad 321b is electrically connected to the common ground terminal of the charge and discharge control circuit and the positive electrode P of the charge input and discharge output of the charge and discharge control circuit. The second pad 322b is electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The third pad 323b serves as the access electrode for the negative electrode 220b of the aluminum-shell lithium-ion cell 200b of the charge and discharge control circuit.

[0124] As shown in Figure 31 and Figure 32 , the inner electrode 340b is disposed on the second surface of the circuit board 300b and is electrically connected to the circuit board 300b. The inner electrode 340b includes an inner electrode welding positioning leg 341b and an inner electrode contact platform 342b. The inner electrode welding positioning leg 341b and the inner electrode contact platform 342b form a strip structure. The inner electrode contact platform 342b is integrally formed with the inner electrode welding positioning leg 341b, and the inner electrode contact platform 342b can be elastically bent relative to the inner electrode welding positioning leg 341b.

[0125] The circuit board 300b is provided with inner electrode positioning holes 305b that penetrate through the first surface and the second surface, and a third pad 323b surrounding the inner electrode positioning holes 305b is provided on the second surface of the circuit board 300b. The inner electrode soldering and positioning feet 341b are inserted into the inner electrode positioning holes 305b, and are soldered to the circuit board through the third pad 323b to establish an electrical connection.

[0126] As Figure 33 and Figure 34 shown, the inner electrode 340b is in a strip shape. During the assembly process of the controller 400b, the inner electrode 340b is not folded and is in an extended state. When the controller 400b is hermetically packaged, the inner electrode contact platform 342b of the inner electrode 340b is folded into a state parallel to the circuit board 300b, and the end of the inner electrode contact platform 342b is suspended relative to the circuit board 300b.

[0127] As Figure 32 and Figure 33 shown, the negative electrode end cap 330b is made of a metal conductive material, is electrically connected to the circuit board 300b and is provided on the first surface of the circuit board 300b. The negative electrode end cap 330b includes a circular hollow cap body with one end open and a negative electrode end cap soldering and positioning foot 331b integrally extended from the cap body. The negative electrode end cap soldering and positioning foot 331b is fixed on the circuit board 300b and is electrically connected to the circuit board 300b. Specifically, the circuit board 300b is provided with a positioning groove 304b that penetrates through the first surface and the second surface, a second pad 322b surrounding the positioning groove 304b is provided on the second surface of the circuit board 300b, and the negative electrode end cap 330b is positioned by inserting the negative electrode end cap soldering and positioning foot 331b into the positioning groove 304b, and the negative electrode end cap soldering and positioning foot 331b is soldered to the circuit board 300b through the second pad 322b to establish an electrical connection, thereby soldering the negative electrode end cap 330b to the circuit board to establish an electrical connection.

[0128] As Figure 33 、 Figure 34 and Figure 35 shown, the controller housing 410b includes a cylindrical side wall 413b and a bottom wall 414b formed at one axial end of the side wall 413b and perpendicular to the side wall 413b. The side wall 413b and the bottom wall 414b enclose an inner cavity. A through hole is opened at the center of the bottom wall 414b, and the other end of the controller housing 410b opposite to the bottom wall 414b is a cylindrical open end. A limiting boss made of a conductive metal material protrudes from the inner surface of the side wall 413b. The limiting boss is an annular platform integrally protruding and formed on the inner surface of the side wall 413b. The annular platform has an annular supporting plane protruding from the inner surface of the side wall 413b for supporting the circuit board, and the supporting plane and the side wall 413b form an annular inner positioning groove 412b with an L-shaped axial cross section.

[0129] The circuit board 300b is received in the inner cavity of the controller housing 410b, and the outer periphery of the circuit board 300b is positioned by the inner positioning groove 412b and is mounted on the limiting boss of the controller housing 410b.

[0130] As Figure 31 、 Figure 33 and Figure 34 shown, a plurality of first pads 321b are provided around the edge of the circuit board 300b. When the circuit board 300b is mounted on the limiting boss, the first surface of the circuit board 300b is flush with the end face of the open end of the controller housing 410b, and the second surface of the circuit board 300b is in contact welding with the limiting boss 415b through the first pads 321b, thereby establishing an electrical connection with the controller housing 410b.

[0131] The first surface of the circuit board 300b faces the open end of the controller housing 410b, and the negative electrode end cap 330b protrudes from the top opening of the controller housing 410b. The second surface of the circuit board 300b faces the bottom of the controller housing 410b, and the inner electrode contact platform 342b of the inner electrode 340b is exposed through the through hole in the center of the bottom wall 414b to be electrically connected to the negative electrode 220b of the aluminum shell lithium-ion battery cell 200b. There is a gap between the edge of the inner electrode contact platform 342b and the edge of the through hole to ensure the insulation between the inner electrode 340b and the controller housing 410b.

[0132] As Figure 34 and Figure 35 shown, the controller 400b further has a controller cover plate 460b. The controller cover plate 460b surrounds the outer periphery of the negative electrode end cap 330b and covers the first surface of the circuit board 300b, and the controller cover plate 460b is made of an insulating material to insulate and protect the circuit components on the first surface of the circuit board 300b that are exposed outside the negative electrode end cap 330b.

[0133] The first pads 321b of the circuit board 300b are electrically connected to the common ground terminal GND of the charge and discharge control circuit. The first pads 321b of the circuit board 300b and the controller housing 410b are electrically connected by welding, so that the controller housing 410b is electrically connected to the common ground terminal GND of the charge and discharge control circuit.

[0134] The second pads 322b of the circuit board 300b are electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The negative electrode end cap 330b is welded to the second pads 322b of the circuit board 300b and an electrical connection is established, so that the negative electrode end cap 330b serves as the negative electrode N of the charge input and discharge output of the charge and discharge control circuit.

[0135] The third pad 323b of the circuit board 300b is connected as the negative electrode 220b access electrode of the aluminum shell lithium-ion battery cell 200b of the charge and discharge control circuit. The inner electrode 340b is welded to the third pad 323b of the circuit board 300b to establish an electrical connection, so that the inner electrode 340b is connected as the negative electrode 220b access electrode of the aluminum shell lithium-ion battery cell 200b of the charge and discharge control circuit.

[0136] Therefore, the negative electrode end cap 330b, the inner electrode 340b, and the controller housing 410b form three structural electrodes of the controller 400b.

[0137] Figure 17 It is an assembly diagram of the controller 400b and the aluminum shell lithium-ion battery cell 200b.

[0138] Such as Figure 17 shown, during assembly, first weld the inner electrode 340b of the controller 400b to the negative electrode 220b of the aluminum shell lithium-ion battery cell 200b to establish an electrical connection between the inner electrode 340b and the negative electrode 220b of the aluminum shell lithium-ion battery cell 200b. Then, coaxially dock the open end of the battery cell cap housing 231b of the aluminum shell lithium-ion battery cell 200b with the controller housing 410b, and weld and establish an electrical connection between the two, so that the controller housing 410b is electrically connected to the battery housing 110b through the battery cell cap housing 231b.

[0139] Such as Figure 15 、 Figure 16 and Figure 17 shown, an insulating layer 470b is provided on the surface of the battery cell cap housing 231b of the aluminum shell lithium-ion battery cell 200b to establish electrical insulation between the battery cell cap housing 231b and the inner electrode 340b of the controller 400b. An insulating layer 470b is also provided on the side of the controller 400b facing the battery cell cap 230b to establish electrical insulation between the controller housing 410b and the inner electrode 340b of the controller 400b.

[0140] After the rechargeable battery 100b is welded and assembled, the inner electrode 340b is connected as the negative electrode of the aluminum shell lithium-ion battery cell 200b to the access electrode of the controller 400b. The negative electrode end cap 330b serves as the negative electrode for the charging input and discharging output of the rechargeable battery 100b, and the battery housing 110b becomes the positive electrode for the charging input and discharging output of the rechargeable battery 100b and the common ground terminal of the charge and discharge control circuit.

[0141] Embodiment 3: Embodiment of a directly sealed lithium-ion battery

[0142] Such as Figure 18 、 Figure 19 shown, the rechargeable battery 100c uses a directly sealed lithium-ion battery cell 200c, and the internal structure of the rechargeable battery 100c is as Figure 20As shown, the structural assembly relationship of the rechargeable battery 100c is as Figure 21 and Figure 22 shown.

[0143] As Figure 18 , Figure 19 and Figure 22 shown, the rechargeable battery 100c (i.e., the directly sealed lithium-ion battery) includes a cylindrical battery outer casing 110c, a directly sealed lithium-ion battery cell 200c installed in the battery outer casing 110c, a positive electrode cap 120c provided at one end of the battery outer casing 110c, and a controller 400c installed at the negative electrode end of the directly sealed lithium-ion battery cell 200c.

[0144] The directly sealed lithium-ion battery cell 200c is filled with electrolyte inside, and the electrolyte inside is directly sealed by the battery outer casing 110c and the controller 400c.

[0145] The battery outer casing 110c can be made of aluminum material. One end of the battery outer casing 110c forms a closed-end boss 112c, and the closed-end boss 112c is connected to the positive electrode cap 120c. The shape of the positive electrode cap 120c is adapted to the shape of the closed-end boss 112c so that the positive electrode cap 120c can be sleeved on the closed-end boss 112c. The positive electrode cap 120c can be assembled and fixed on the closed-end boss 112c of the battery outer casing 110c by the method of interference fit extrusion assembly, and an electrical connection is established.

[0146] As Figure 21 , Figure 22 and Figure 23 shown, the opposite ends of the directly sealed lithium-ion battery cell 200c respectively have a positive electrode 210c and a negative electrode 220c. The controller 400c is provided at the open end of the battery outer casing 110c and is welded to the negative electrode of the directly sealed lithium-ion battery cell 200c to establish an electrical connection, so that the controller 400c directly closes the open end of the battery outer casing 110c.

[0147] For the specific structure diagram of the controller 400c, refer to Figures 36 to 40 .

[0148] As shown in Figure Figure 39 and Figure 40 shown, a controller outer casing assembly 410c is provided on the periphery of the controller 400c. An inner electrode 340c is provided at one axial end of the controller 400c, and a negative electrode end cap 330c is provided at the other end. A circuit board 300c is provided inside the controller 400c. The inner electrode 340c is welded to the second surface of the circuit board 300c and is electrically connected to the circuit board 300c. The negative electrode end cap 330c is welded to the first surface of the circuit board 300c and is electrically connected to the circuit board 300c.

[0149] As Figure 36 and Figure 37As shown, the circuit board structure in this embodiment is the same as that in the above two embodiments. On the second surface of the circuit board 300c in this embodiment, a first pad 321c (i.e., the controller housing pad), a second pad 322c (i.e., the negative electrode end cap pad), and a third pad 323c (i.e., the inner electrode pad) are provided. The first pad 321c is electrically connected to the common ground terminal of the charge and discharge control circuit and the positive electrode P of the charge input and discharge output of the charge and discharge control circuit. The second pad 322c is electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The third pad 323c is connected as the negative electrode 220b of the directly encapsulated lithium-ion battery cell 200c of the charge and discharge control circuit to access the electrode.

[0150] As Figure 36 shown, the inner electrode 340c is provided on the second surface of the circuit board 300c. The inner electrode 340 includes an inner electrode contact stage 342c parallel to the circuit board and inner electrode welding and positioning feet 341c connected to the inner electrode contact stage 342c. The circuit board 300c is provided with an inner electrode positioning hole 305c penetrating the first surface and the second surface. A third pad 323c is provided on the second surface of the circuit board 300c around the inner electrode positioning hole 305c. The inner electrode 340c is positioned by inserting the inner electrode welding and positioning feet 341c into the inner electrode positioning hole 305c, and the inner electrode welding and positioning feet 341c are welded to the circuit board 300c through the third pad 323c to establish an electrical connection.

[0151] As Figure 37 shown, the negative electrode end cap 330c is made of a metal conductive material, which is electrically connected to the circuit board 300c and is provided on the first surface of the circuit board 300c. Negative electrode end cap welding and positioning feet 331c are provided on the negative electrode end cap 330c. A positioning groove 304c and a second pad 322c surrounding the positioning groove 304c are provided on the circuit board 300c. The negative electrode end cap 330c is positioned by inserting the negative electrode end cap welding and positioning feet 331c into the positioning groove 304c, and the negative electrode end cap welding and positioning feet 331c are welded to the circuit board 300c through the second pad 322c to establish an electrical connection.

[0152] As Figure 36 、 Figure 38 and Figure 39As shown, the controller housing assembly 430c includes a controller housing 410c and a circuit board support 420c. The circuit board support 420c is welded inside the controller housing 410c and forms a limiting boss inside the controller housing 410c for mounting the circuit board 300c. The periphery of the second surface of the circuit board 300c is provided with first pads 321c. The circuit board is fixed to the circuit board support 420c through the first pads 321c, and is welded and fixed to the controller housing 410c through the circuit board support 420c to establish an electrical connection. A through hole is opened at the bottom of the controller housing 410c, and the inner electrode contact platform 342c of the inner electrode 340c is exposed through the through hole to be electrically connected to the negative electrode 220c of the directly sealed lithium-ion cell 200c. There is a gap between the edge of the inner electrode contact platform 342c and the edge of the through hole to ensure insulation between the inner electrode 340c and the controller housing 410c.

[0153] As Figure 39 and Figure 40 shown, further, on the end face of the controller 400c where the negative electrode end cap 330c is installed, a controller cover plate 460c and a cover plate light-shielding ring 490c are also provided. The controller cover plate 460c can be made of a transparent or semi-transparent light-conducting insulating material and is used to conduct the light emitted by the indicator light inside the controller 400c. The cover plate light-shielding ring 490c covers above the controller cover plate 460c and is used to block the light emitted by the indicator light inside the controller 400c so that the light is emitted from the side of the controller cover plate 460c.

[0154] The first pads 321c of the circuit board 300c are electrically connected to the common ground terminal GND of the charge and discharge control circuit. The first pads 321c of the circuit board 300c are welded to the circuit board support 420c to establish an electrical connection, and the circuit board support 420c is welded to the controller housing 410c to establish an electrical connection, so that the controller housing 410c is electrically connected to the common ground terminal GND of the charge and discharge control circuit.

[0155] The second pads 322c of the circuit board 300c are electrically connected to the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The negative electrode end cap 330c is welded to the second pads 322c of the circuit board 300c to establish an electrical connection, so that the negative electrode end cap 330c serves as the negative electrode N of the charge input and discharge output of the charge and discharge control circuit.

[0156] The third pads 323c of the circuit board 300c serve as the access electrodes for the negative electrode 220c of the directly sealed lithium-ion cell 200c of the charge and discharge control circuit. The inner electrode 340c is welded to the third pads 323c of the circuit board 300c to establish an electrical connection, so that the inner electrode 340c serves as the access electrode for the negative electrode 220c of the directly sealed lithium-ion cell 200c of the charge and discharge control circuit.

[0157] Therefore, the negative electrode end cap 330c, the inner electrode 340c, and the controller housing 410c form the three structural electrodes of the controller 400c.

[0158] Figure 21 and Figure 22 are the assembly relationship diagrams of the rechargeable battery 100c.

[0159] During assembly, first, the directly sealed lithium-ion battery cell 200c is inserted into the battery housing 110c with the positive electrode 210c facing the closed end of the battery housing 110c, and the positive electrode 210c of the directly sealed lithium-ion battery cell 200c is welded to the closed end of the battery housing 110c. Then, an insulating layer 470c is pasted on the axial bottom surface of the controller housing 410c of the controller 400c facing the directly sealed lithium-ion battery cell. The insulating layer 470c can be composed of a polyimide film with adhesive on one side, which is used to establish electrical insulation between the negative electrode 220c of the directly sealed lithium-ion battery cell 200c and the controller housing 410c. After that, the negative electrode 220c of the directly sealed lithium-ion battery cell 200c is welded to the inner electrode 340c of the controller 400c, so that the negative electrode 220c of the directly sealed lithium-ion battery cell 200c and the inner electrode 340c are fixed by welding and establish an electrical connection. Then, electrolyte is poured into the cavity of the battery housing 110c with the directly sealed lithium-ion battery cell 200c welded at the open end of the battery housing 110c. Finally, the controller 400c is aligned with the battery housing 110c in the coaxial direction, and the controller housing 410c is welded to the battery housing 110c and an electrical connection is established.

[0160] After the welding of the rechargeable battery 100c is completed, the inner electrode 340c serves as the access electrode of the negative electrode of the directly sealed lithium-ion battery cell 200c to access the controller 400c, the negative electrode end cap 330c serves as the negative electrode for charging input and discharging output of the rechargeable battery 100c, and the battery housing 110c becomes the positive electrode for charging input and discharging output of the rechargeable battery 100c and the common grounding end of the charge and discharge control circuit.

[0161] Embodiment 4: Embodiment of the CID battery cell rechargeable battery

[0162] The external structure of the rechargeable battery 100d is as shown in Figure 23a and the structural assembly relationship of the rechargeable battery 100d is as shown in Figure 23b and Figure 23c as shown.

[0163] The rechargeable battery 100d includes a CID lithium-ion battery cell 200d and a controller 400d.

[0164] As shown in Figure 23a , Figure 23b and Figure 23cAs shown, the rechargeable battery 100d uses a CID lithium-ion battery cell 200d. CID is the abbreviation of current interrupt device, that is, a current cut-off device. When the CID lithium-ion battery cell 200d fails (such as overheating, short circuit, overcharging, etc.), a lot of gas will be generated inside. When the pressure increases, the pressure relief sheet inside the battery cell flips over, causing a short circuit inside the battery cell, thereby playing a protective role.

[0165] The CID lithium ion battery cell 200d is filled with electrolyte, and has a negative electrode 220d and a positive electrode 120d at both ends. The outer wall of the CID lithium ion battery cell 200d is the battery shell 110d. The battery shell 110d is connected to the positive electrode 120d of the CID lithium ion battery cell 200d as a whole and establishes an electrical connection. A battery cell pressure relief hole 234d is provided at the negative electrode of the CID lithium ion battery cell 200d, and the gas generated by the CID lithium ion battery cell 200d can be relieved through the battery cell pressure relief hole 234d.

[0166] The controller 400d is installed at the negative electrode end of the CID lithium-ion battery cell 200d. The internal structure of the controller 400d is roughly the same as the structure of the controller 400b of the aluminum shell lithium-ion battery cell rechargeable battery 100b, that is, the controller 400d is provided with a controller outer shell 410d on the periphery, the controller 400d is provided with an inner electrode 340d at one axial end, and a negative electrode end cap 330d is provided at the other end, and a circuit board is provided inside the controller 400d (not shown in the figure). The charge and discharge control circuit is arranged on the circuit board, and the negative electrode end cap 330d serves as the negative electrode N of the charge input and discharge output of the charge and discharge control circuit. The controller outer shell 410d is electrically connected to the common ground terminal GND of the charge and discharge control circuit, so that the inner electrode 340d is connected to the negative electrode 220d of the soft-pack lithium-ion battery cell 200d as the charge and discharge control circuit.

[0167] The inner electrode 340d of the controller 400d is welded and fixed to the negative electrode 220d of the CID lithium-ion battery cell 200d and electrically connected, so that the inner electrode 340d constitutes an access electrode of the negative electrode of the lithium-ion battery cell.

[0168] An insulating layer 470d is provided on the periphery of the negative electrode 220d of the CID lithium-ion battery cell 200d to establish electrical insulation between the controller outer shell 410d and the inner electrode 340d of the controller 400d.

[0169] One end of the battery outer casing 110d is welded and fixed to the controller outer casing 410d of the controller 400d to establish an electrical connection. Also, since the positive electrode 120d of the CID lithium-ion battery cell 200d is electrically connected to the battery outer casing 110d, and the controller outer casing 410d is electrically connected to the common ground terminal GND of the charge and discharge control circuit, the battery outer casing 110d constitutes the positive electrode of the rechargeable battery 100d and the common ground terminal GND of the charge and discharge control circuit.

[0170] The negative electrode end cap 330d serves as the negative electrode of the rechargeable battery 100d and the negative electrode N for the charge input and discharge output of the charge and discharge control circuit.

[0171] The CID lithium-ion battery cell 200d of this embodiment has structures such as a current cut-off protection device and a pressure relief sheet inside, so it has a current cut-off protection function. In other embodiments, if the pressure relief protection function is not required, structures such as the current cut-off protection device, the pressure relief sheet, and the pressure relief hole 234d in the CID lithium-ion battery cell 200d of this embodiment can be omitted.

[0172] The specific structure of the rechargeable battery has been introduced in detail through four specific embodiments above. Although there are differences in the inner electrode structure, the controller outer casing structure, the lithium-ion battery cell structure, and the packaging structure between the lithium-ion battery cell and the controller in each embodiment, the circuit principles of the above four embodiments are the same.

[0173] The following will be through Figure 24a and Figure 24b The working principles of the above four rechargeable battery embodiments will be introduced in detail.

[0174] Figure 24a is the circuit principle block diagram of the rechargeable battery, Figure 24b is the charge and discharge principle block diagram of the rechargeable battery.

[0175] The circuit principle of the rechargeable battery is as follows:

[0176] Refer to Figure 24a , the positive electrode 210 of the lithium-ion battery cell 200 is electrically connected to the battery outer casing 110, the battery outer casing 110 is electrically connected to the controller outer casing 410, the controller outer casing 410 is electrically connected to the circuit board 300 through the first pad 321 provided on the circuit board 300, and is electrically connected to the common ground terminal GND of the charge and discharge control circuit on the circuit board 300 through the first pad 321. The battery outer casing 110 serves as the positive electrode P of the rechargeable battery 100 and the common ground terminal GND of the charge and discharge control circuit.

[0177] The negative electrode end cap 330 of the controller 400 is electrically connected to the circuit board 300 through the second pad 322, and the second pad 322 is electrically connected to the charging input terminal and the discharging output terminal of the charge and discharge control circuit on the circuit board. Therefore, the negative electrode end cap 330 serves as the negative electrode N of the rechargeable battery 100.

[0178] The internal electrode 340 of the controller 400 is electrically connected to the circuit board 300 through the third pad 323, and the internal electrode 340 is also electrically connected to the negative electrode 220 of the lithium-ion battery cell. Thus, the negative electrode 220 of the lithium-ion battery cell is introduced into the charge and discharge control circuit of the circuit board 300 through the internal electrode 340.

[0179] Refer to Figure 24b , a charge and discharge control circuit 310 is provided on the circuit board 300, which specifically includes two parts of circuits, namely, a charging control circuit 311 and a discharging control circuit 312. The charging input terminal of the charging control circuit 311 is electrically connected to the discharging output terminal of the discharging control circuit 312 and both are electrically connected to the second pad 322, and are electrically connected to the negative electrode end cap 330 through the second pad 322. The charging output terminal of the charging control circuit 311 is electrically connected to the discharging input terminal of the discharging control circuit 312 and both are electrically connected to the third pad 323, and are electrically connected to the negative electrode 220 of the lithium-ion battery cell 200 through the third pad 323. The common ground terminal GND of the charging control circuit 311 is electrically connected to the common ground terminal GND of the discharging control circuit 312 and both are electrically connected to the first pad 321, and are electrically connected to the controller housing 410 and the battery housing 110 through the first pad 321.

[0180] When the discharging control circuit 312 detects that an external charging power source is not connected to the rechargeable battery or detects that the connection between the external charging power source and the rechargeable battery is disconnected, the discharging control circuit 312 controls the rechargeable battery 100 to enter the discharging state.

[0181] In the discharging state, when the absolute value of the voltage of the lithium-ion battery cell 200 is higher than the set discharging cut-off voltage, the discharging control circuit 312 converts the discharging voltage of the negative electrode of the lithium-ion battery cell 200 into a set negative electrode discharging voltage by controlling the discharging voltage of the negative electrode of the lithium-ion battery cell 200, and outputs it through the negative electrode N of the rechargeable battery (i.e., the negative electrode end cap 330), so that the lithium-ion battery cell 200 discharges externally; when the absolute value of the voltage of the lithium-ion battery cell 200 is equal to or lower than the discharging cut-off voltage, the discharging control circuit 312 cuts off the discharging loop connected to the negative electrode of the lithium-ion battery cell, so that the lithium-ion battery cell 200 stops discharging externally.

[0182] When the charging control circuit 311 detects that an external charging power source is connected to the rechargeable battery, when the voltage of the external power source meets the charging conditions, the charging control circuit 311 starts charging the lithium-ion battery cell, and when the voltage of the external charging power source does not meet the charging conditions, the charging control circuit 311 stops charging the lithium-ion battery cell.

[0183] In the charging state, the charging control circuit 311 detects the voltage of the lithium-ion battery cell 200, and based on the voltage state of the lithium-ion battery cell, the charging control circuit 311 controls the input voltage and / or current of the negative electrode N of the rechargeable battery (i.e., the negative electrode end cap 330) and outputs it to the negative electrode of the lithium-ion battery cell to charge the lithium-ion battery cell. After the lithium-ion battery cell is fully charged or the rechargeable battery is disconnected from the external charging power supply, the charging control circuit 311 is cut off, and thus the charging of the lithium-ion battery cell is turned off.

[0184] For the control method of charging the lithium-ion battery cell, trickle charging, constant current charging, or constant voltage charging can be adopted, or a combination of trickle, constant current, or constant voltage charging can be used. For example, when the absolute value of the voltage of the lithium-ion battery cell is lower than the set discharge cut-off voltage, the lithium-ion battery cell is charged by trickle charging by controlling the charging current of the negative electrode of the lithium-ion battery cell; when the absolute value of the voltage of the lithium-ion battery cell is equal to or higher than the set discharge cut-off voltage but lower than the set charging upper limit voltage, the lithium-ion battery cell is charged by constant current charging by controlling the charging current of the negative electrode of the lithium-ion battery cell; when the absolute value of the voltage of the lithium-ion battery cell is equal to the set charging upper limit voltage, the lithium-ion battery cell is charged by constant voltage charging by controlling the charging voltage of the negative electrode of the lithium-ion battery cell; when the charging current of the lithium-ion battery cell during constant voltage charging decreases to be equal to or less than the set charging termination current, it is determined that the lithium-ion battery cell is fully charged, and the charging control circuit 311 turns off the charging of the lithium-ion battery cell.

[0185] The discharge control circuit 312 can be a linear buck or boost control circuit, or a DC-DC buck or boost control circuit.

[0186] To facilitate the discharge control circuit 312 to control the discharge voltage of the negative electrode of the lithium-ion battery cell 200, the negative level can be used to control the discharge control circuit 312 to convert the discharge voltage of the negative electrode of the lithium-ion battery cell into a set discharge voltage and output it externally.

[0187] The charging control circuit can be a linear buck or boost control circuit, or a DC-DC buck or boost control circuit.

[0188] To facilitate the charging control circuit 311 to control the input voltage and / or current of the negative electrode of the rechargeable battery and output it to the negative electrode of the lithium-ion battery cell, the negative level can be used to control the charging control circuit 311, and then the input voltage and / or current of the negative electrode of the rechargeable battery can be controlled to charge the lithium-ion battery cell by trickle, constant current, or constant voltage charging.

[0189] When specifically implementing the charge and discharge control circuit, the main circuits of the charging control circuit and the discharge control circuit can be integrated in one chip or integrated separately.

[0190] In other embodiments, the charging control circuit in the controller of the rechargeable battery can also be omitted, and the charging control circuit can be placed in a charging stand that matches the rechargeable battery.

[0191] In other embodiments, the controller housing 410 of the controller can also be omitted, so that the control circuit assembly composed of the circuit board 300, the inner electrode 340, and the negative electrode end cap 330 is directly received in the battery housing 110, and the common ground terminal of the battery housing 110 and the circuit board 300 is electrically connected.

[0192] In other embodiments, the inner electrode 340 can also be omitted, and instead, a wire or other means can be used to establish an electrical connection between the negative electrode 220 of the lithium-ion battery cell and the circuit board 300, or the negative electrode 220 of the lithium-ion battery cell can be directly soldered to the third pad 323 on the circuit board 300.

[0193] Discharge control method of rechargeable battery

[0194] The discharge control method of the rechargeable battery in this embodiment is applied to the electrical system of the rechargeable battery, and specifically includes:

[0195] Electrically connect the positive electrode of the lithium-ion battery cell to the common ground terminal of the discharge control circuit, and use the common ground terminal as the positive electrode for discharging the rechargeable battery.

[0196] Electrically connect the negative electrode of the lithium-ion battery cell to the input terminal of the discharge control circuit, convert it into a set negative electrode discharge voltage through the discharge control circuit, and output it through the output electrode. The output electrode serves as the negative electrode for discharging the rechargeable battery.

[0197] Among them, the specific implementation scheme of "electrically connecting the positive electrode of the lithium-ion battery cell to the common ground terminal of the discharge control circuit" can be the same as the above four embodiments of the rechargeable battery. The discharge control circuit is arranged in a controller, and the common ground terminal of the discharge control circuit is electrically connected through the controller housing of the controller, and the controller housing is respectively electrically connected to the positive electrode of the lithium-ion battery cell and the battery housing to realize the electrical connection between the positive electrode of the lithium-ion battery cell and the common ground terminal of the discharge control circuit. It is also possible not to adopt the specific scheme in the above four embodiments of the rechargeable battery. For example, the controller housing is omitted, and the battery housing is directly electrically connected to the common ground terminal of the discharge control circuit, and the battery housing is electrically connected to the positive electrode of the lithium-ion battery cell.

[0198] Among them, the specific implementation scheme of "electrically connecting the negative electrode of the lithium-ion battery cell to the input end of the discharge control circuit" can be the same as the above four rechargeable battery embodiments, where the discharge control circuit is arranged in a controller, and an internal electrode is arranged in the controller, so that the internal electrode is electrically connected to the input end of the discharge control circuit, and the negative electrode of the lithium-ion battery cell is welded to the internal electrode to establish an electrical connection with the input end of the discharge control circuit. The specific schemes in the above four rechargeable battery embodiments may also not be adopted, such as: omitting the internal electrode, and directly establishing an electrical connection between the negative electrode of the lithium-ion battery cell and the input end of the discharge control circuit in the controller through a wire or other conductive structure, or directly welding the negative electrode of the lithium-ion battery cell to the circuit board.

[0199] Specifically, the discharge control method includes:

[0200] When the discharge control circuit detects that the external charging power source is not connected to the rechargeable battery or detects that the external charging power source is electrically disconnected from the rechargeable battery, the discharge control circuit controls the rechargeable battery to enter a discharge state;

[0201] When the rechargeable battery is in the discharge state, when the absolute value of the voltage of the lithium-ion battery cell is higher than the set discharge cut-off voltage, the discharge control circuit controls the discharge voltage of the negative electrode of the lithium-ion battery cell to allow the lithium-ion battery cell to discharge externally;

[0202] When the rechargeable battery is in the discharge state, when the absolute value of the voltage of the lithium-ion battery cell is equal to or lower than the discharge cut-off voltage, the discharge control circuit stops the lithium-ion battery cell from discharging by shutting down the negative electrode of the lithium-ion battery cell.

[0203] Among them, when the charge and discharge control circuit detects that the external charging power supply is not connected or detects that the external charging power supply is disconnected, the charge and discharge control circuit turns on the discharge control circuit, and converts the discharge voltage of the negative electrode of the lithium-ion battery cell into a set negative electrode discharge voltage before discharging it to the outside; when the absolute value of the lithium-ion battery cell voltage is equal to or lower than the discharge cut-off voltage, the discharge control circuit turns off the lithium-ion battery cell from discharging to the outside.

[0204] Charging control method for rechargeable battery

[0205] The charging control method of the rechargeable battery of this embodiment is applied to the electrical system of the rechargeable battery itself or an electrical system independent of the rechargeable battery (e.g., the electrical system of a charging stand matched with the rechargeable battery), and the charging control method specifically includes:

[0206] The positive electrode of the charging input of the rechargeable battery is electrically connected to the common ground terminal of the charging control circuit, and the common ground terminal is used as the positive electrode of the charging input of the rechargeable battery;

[0207] Use the negative electrode of the charging input of the rechargeable battery as the input terminal of the charging control circuit, so that the charging control circuit controls the input voltage and / or current of the negative electrode and outputs it to the negative electrode of the lithium-ion battery cell to charge the lithium-ion battery cell.

[0208] Among them, the specific implementation of "electrically connect the positive electrode of the charging input of the rechargeable battery to the common ground terminal of the charging control circuit" can be the same as the above four embodiments of the rechargeable battery. Use the positive electrode of the lithium-ion battery cell as the positive electrode of the charging input of the rechargeable battery, arrange the charging control circuit in a controller, electrically connect the common ground terminal of the charging control circuit through the controller housing of the controller, and electrically connect the positive electrode of the lithium-ion battery cell and the battery housing through the controller housing respectively, to achieve the electrical connection of the positive electrode of the rechargeable battery to the common ground terminal of the discharge control circuit. It is also possible not to adopt the specific scheme in the above four embodiments of the rechargeable battery. For example, omit the controller housing, directly electrically connect the battery housing to the common ground terminal of the charging control circuit, and electrically connect the battery housing to the positive electrode of the lithium-ion battery cell.

[0209] Among them, the specific control method of "the charging control circuit controls the input voltage and / or current of the negative electrode" includes:

[0210] When the absolute value of the voltage of the lithium-ion battery cell is lower than the set discharge cut-off voltage, trickle charge the lithium-ion battery cell by controlling the charging current of the negative electrode of the lithium-ion battery cell;

[0211] When the absolute value of the voltage of the lithium-ion battery cell is equal to or higher than the set discharge cut-off voltage but lower than the set charging upper limit voltage, charge the lithium-ion battery cell at a constant current by controlling the charging current of the negative electrode of the lithium-ion battery cell;

[0212] When the absolute value of the voltage of the lithium-ion battery cell is equal to the set charging upper limit voltage, charge the lithium-ion battery cell at a constant voltage by controlling the charging voltage of the negative electrode of the lithium-ion battery cell;

[0213] When the charging current of the lithium-ion battery cell during constant voltage charging decreases to equal to or less than the set charging termination current, it is determined that the lithium-ion battery cell is fully charged, and the charging control circuit closes the charging of the lithium-ion battery cell.

[0214] In other embodiments, it is also possible to select one or two of trickle charging, constant current charging or constant voltage charging.

[0215] Furthermore, in the above charging control method, before the rechargeable battery enters the charging state, it is also necessary to perform a charging power supply detection.

[0216] When the charging control circuit detects that an external charging power source is connected to the rechargeable battery, the charging control circuit controls the rechargeable battery to enter the charging state. When the rechargeable battery is in the charging state, the charging control circuit detects the voltage of the lithium-ion battery cell and, based on the voltage state of the lithium-ion battery cell, controls the charging of the lithium-ion battery cell by controlling the input voltage and / or current of the negative electrode of the lithium-ion battery cell.

[0217] When the charging control circuit detects that the lithium-ion battery cell is fully charged or the rechargeable battery is disconnected from the external charging power source, the charging of the lithium-ion battery cell is turned off.

[0218] Further, in the above charging control method, before the rechargeable battery enters the charging state, it is also necessary to perform a charging condition detection.

[0219] When an external charging power source is connected to the rechargeable battery, the charging control circuit detects the voltage of the external power source. When the voltage of the external power source meets the charging conditions, the charging control circuit starts charging the lithium-ion battery cell.

[0220] When the voltage of the external charging power source does not meet the charging conditions, the charging control circuit stops charging the lithium-ion battery cell.

[0221] Although the present disclosure has been described with reference to several exemplary embodiments, it should be understood that the terms used are descriptive and exemplary, rather than restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be broadly construed within the spirit and scope defined by the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A method for controlling the discharge of a rechargeable battery, which is applied to the electrical system of the rechargeable battery. The electrical system includes a lithium-ion battery cell and a discharge control circuit, and is characterized in that, The discharge control method includes: Electrically connect the positive electrode of the lithium-ion battery cell to the common ground terminal of the discharge control circuit, and use the common ground terminal as the positive electrode for the discharge output of the rechargeable battery; Electrically connect the negative electrode of the lithium-ion battery cell to the input terminal of the discharge control circuit, convert it into a set negative electrode discharge voltage through the discharge control circuit, and output it outward through the output electrode, and the output electrode serves as the negative electrode for the discharge output of the rechargeable battery.

2. The discharge control method of the rechargeable battery according to claim 1, wherein When the discharge control circuit detects that an external charging power source is not connected to the rechargeable battery or detects that the connection between the external charging power source and the rechargeable battery is disconnected, the discharge control circuit controls the rechargeable battery to enter the discharge state; When the rechargeable battery is in the discharge state and the absolute value of the voltage of the lithium-ion battery cell is higher than the set discharge cut-off voltage, the discharge control circuit allows the lithium-ion battery cell to discharge externally by controlling the negative electrode discharge voltage of the lithium-ion battery cell; When the rechargeable battery is in the discharge state and the absolute value of the voltage of the lithium-ion battery cell is equal to or lower than the discharge cut-off voltage, the discharge control circuit stops the lithium-ion battery cell from discharging externally by turning off the negative electrode discharge of the lithium-ion battery cell.

3. A charging control method for a rechargeable battery, which is applied to the rechargeable battery itself or an electrical system independent of the rechargeable battery externally. The electrical system includes a charging control circuit, and the rechargeable battery includes a lithium-ion cell. It is characterized in that, The charge control method includes: Electrically connect the positive electrode of the rechargeable battery charge input to the common ground terminal of the charge control circuit, electrically connect the positive electrode of the lithium-ion battery cell to the common ground terminal of the charge control circuit, and use the common ground terminal as the positive electrode of the rechargeable battery charge input; Electrically connect the negative electrode of the rechargeable battery charge input to the input terminal of the charge control circuit, so that the charge control circuit controls the input voltage and / or current of the negative electrode connected to the rechargeable battery and outputs it to the negative electrode of the lithium-ion battery cell to charge the lithium-ion battery cell.

4. The charge control method of the rechargeable battery according to claim 3, wherein When the charge control circuit detects that an external charging power source is connected to the rechargeable battery, the charge control circuit controls the rechargeable battery to enter the charge state; When the rechargeable battery is in the charge state, the charge control circuit detects the voltage of the lithium-ion battery cell and, based on the voltage state of the lithium-ion battery cell, controls the input voltage and / or current of the negative electrode of the lithium-ion battery cell to charge the lithium-ion battery cell, and turns off the charging of the lithium-ion battery cell after the lithium-ion battery cell is fully charged or the rechargeable battery is disconnected from the external charging power source.

5. The charge control method of the rechargeable battery according to claim 3, wherein In the state where an external charging power source is connected to the rechargeable battery, the charge control circuit detects the voltage of the external power source, and when the voltage of the external power source meets the charging conditions, the charge control circuit starts charging the lithium-ion battery cell; When the voltage of the external charging power source does not meet the charging conditions, the charge control circuit stops charging the lithium-ion battery cell.

6. A rechargeable battery, characterized in that, It includes: A lithium-ion battery cell and a controller installed at one end of the negative electrode of the lithium-ion battery cell. The controller includes: a circuit board, on which a discharge control circuit and a negative electrode end cap are arranged; The common ground terminal of the discharge control circuit is electrically connected to the positive electrode of the lithium-ion battery cell; The negative electrode end cap is welded to the circuit board, and the negative electrode end cap is electrically connected to the discharge output end of the discharge control circuit by welding; The discharge control circuit has a discharge input end, and the negative electrode of the lithium-ion battery cell is welded and electrically connected to the discharge input end; The positive electrode of the lithium-ion battery cell serves as the positive electrode of the rechargeable battery, and the negative electrode end cap serves as the negative electrode of the rechargeable battery.

7. The rechargeable battery according to claim 6, wherein, An internal electrode is also welded on the circuit board. The negative electrode end cap and the internal electrode are respectively arranged on the opposite first surface and second surface of the circuit board. The internal electrode is electrically connected to the discharge input end of the discharge control circuit by welding, so that the internal electrode becomes the access electrode for the negative electrode of the lithium-ion battery cell to access the controller.

8. The rechargeable battery according to claim 6, wherein, A controller housing is arranged around the controller. The circuit board is located in the controller housing, and the controller housing is electrically connected to the common ground end of the discharge control circuit by welding.

9. The rechargeable battery according to claim 8, wherein The outer wall of the lithium-ion battery cell has a battery housing made of a conductive material, and the battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; One end of the battery housing is electrically connected to the controller housing by welding, so that the battery housing is electrically connected to the positive electrode of the lithium-ion battery cell, the controller housing, and the common ground end of the discharge control circuit.

10. The rechargeable battery according to claim 8, wherein The lithium-ion battery cell is placed in a battery housing made of a conductive material. The battery housing has a structure with one end open and the other end closed, and a positive electrode cap is provided at the closed end. The battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; A cell cap housing is provided at the open end of the battery housing. The controller housing is fixed and electrically connected to the battery housing by welding with the cell cap housing.

11. The rechargeable battery according to claim 8, wherein The lithium-ion battery cell is placed in a battery housing made of a conductive material. The battery housing has a structure with one end open and the other end closed, and a positive electrode cap is provided at the closed end. The battery housing is electrically connected to the positive electrode of the lithium-ion battery cell; The controller is arranged at the open end of the battery housing, and the controller housing is welded and electrically connected to the battery housing.

12. The rechargeable battery according to claim 6, wherein, A charging control circuit is also arranged on the circuit board, The common ground end of the charging control circuit is electrically connected to the common ground end of the discharge control circuit; The charging input end of the charging control circuit is electrically connected to the discharge output end of the discharge control circuit, and thus is electrically connected to the negative electrode end cap; The charging output end of the charging control circuit is electrically connected to the discharge input end of the discharge control circuit, and thus is electrically connected to the negative electrode of the lithium-ion battery cell.

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