Rechargeable battery, battery controller, and method of assembling a rechargeable battery

Abstract

The present invention provides a rechargeable battery, a battery controller, and a packaging method for a rechargeable battery. The rechargeable battery includes an electric core and a battery controller. The outer shell of the electric core includes a main body part and a head part, and the outer diameter of the head part of the electric core is smaller than the outer diameter of the main body part. The battery controller includes a controller housing and an electric control component; the controller housing includes a controller side wall in a cylindrical shape; the electric control component includes an inner electrode, a conversion circuit, and a positive electrode end cover; the positive electrode end cover of the electric control component is exposed outside the controller side wall and protrudes outward along one axial end of the controller side wall; the controller side wall extends out of the electric control component to form an electric core connection part, and the electric core connection part and the electric control component together form a receiving cavity; the electric core connection part of the controller side wall is sleeved on the outer periphery of the head part of the electric core, the head part of the electric core is received in the receiving cavity of the battery controller, and the head part of the electric core is in interference fit with the electric core connection part, and the positive electrode of the electric core abuts against the inner electrode of the battery controller to achieve electrical connection.

Description

Technical Field

[0001] The present invention relates to the technical field of secondary batteries, and particularly to a rechargeable battery, a battery controller, and an assembly method of a rechargeable battery. Background Art

[0002] With the rapid development of the charge and discharge control technology of lithium-ion batteries, a method is adopted in which a charge and / or discharge control circuit, a DC-DC conversion circuit and a lithium-ion battery are encapsulated together. The control circuit controls the charging and / or discharging of the lithium-ion battery, and then the DC-DC conversion circuit converts the voltage of the lithium-ion battery into a required voltage for regulated discharge, so as to form a rechargeable battery that is compatible with the standardized primary battery of GB / T 8897.2 (IEC 60086-2). It is superior to the existing simple electrochemically rechargeable batteries in terms of nominal voltage compatibility, discharge voltage stability, charging rate, weight and volume specific energy, charge and discharge memory effect, abuse protection and tolerance, cycle service life, etc., and can replace other electrochemically rechargeable batteries in the field of rechargeable battery products that are compatible with the standardized primary battery of GB / T 8897.2 (IEC 60086-2).

[0003] This type of electronically controlled rechargeable battery formed by encapsulating a charge and / or discharge control circuit and a lithium-ion cell together has currently been widely recognized in the battery consumer market and is gradually replacing traditional standardized primary batteries and electrochemically rechargeable batteries such as nickel-metal hydride batteries that are compatible with standardized primary batteries.

[0004] At present, a relatively high-standard encapsulation process for an electronically controlled rechargeable battery is to encapsulate the control circuit and the lithium-ion cell separately, and then connect the two by using a laser sealing and welding process. The specific encapsulation method is as follows: First, the control circuit is encapsulated inside a metal shell to form a controller; the lithium-ion cell is installed inside the metal shell; then, the outer shell of the lithium-ion cell and the controller are coaxially fixed respectively by a jig. After ensuring that the two are concentric, the metal at the mating part of the outer shell of the controller and the outer shell of the cell is laser-welded to connect the two together, thereby producing a finished battery.

[0005] However, the above process has the following disadvantages: 1. The process has high requirements for the precision of the laser sealing jig. The battery cell and the controller each require a jig to clamp them. Moreover, the jig is easy to wear out after a long time of use and needs to be replaced regularly. After each replacement of the jig, the precision needs to be readjusted. Otherwise, it is easy to cause the welding between the controller and the battery cell to be skewed, which seriously affects the appearance of the finished battery. 2. The laser energy adjustment is cumbersome. If the energy is too large, it is easy to weld through the battery cell and directly scrap it. If the energy is too small, it is easy to cause empty welding or insufficient welding strength. 3. The laser sealing process has relatively high requirements for structural parts, such as the controller housing and the battery cell housing. The matching part between the end of the controller housing and the battery cell housing is relatively sensitive. In terms of the molding process of the controller housing, it is easy to cause undesirable phenomena such as a bell-shaped mouth at the tail of the controller housing. When undesirable phenomena such as a bell-shaped mouth occur, it is very difficult to weld the battery cell, and empty welding and poor welding spots are prone to occur. The thickness of the controller shell and the battery shell also affects the welding. Generally, the thickness of the controller shell is larger than that of the battery shell. This ensures that when the laser is welding the metal, the controller shell can melt a little more, and the metal at the R corner of the battery shell can melt a little less, so as not to weld through the battery shell, thereby avoiding leakage of the battery. Taking all factors into consideration, the supplier level of structural parts and the consistency of products are very high, especially for iron shell batteries. For the current iron shell battery suppliers, to meet the requirements of laser sealing, the cost of the battery will increase greatly. 4. With the laser sealing process, even if no leakage is found at the time after welding is completed, existing examples have shown that after the laser sealing welding, the battery will still leak after being left for a few days. Once the leaking battery flows into the hands of the user, it will be a serious quality accident.

[0006] In summary, the laser sealing welding connection process is not an ideal solution for mass production, so it is necessary to find an alternative solution. Summary of the invention

[0007] The object of the present invention is to provide a rechargeable battery with simple packaging, a battery controller and a packaging method for the rechargeable battery, so as to reduce the packaging difficulty of the rechargeable battery and improve the packaging quality.

[0008] In order to solve the above technical problems, the present invention provides a rechargeable battery, comprising:

[0009] The battery cell is a lithium-ion battery cell having a positive electrode and a negative electrode; the shell of the battery cell comprises a cylindrical main body and a head with a cylindrical shape formed at one axial end of the main body, the outer diameter of the head of the battery cell is smaller than the outer diameter of the main body, the positive electrode is arranged at one end of the head, and the negative electrode is arranged at one end of the main body facing away from the head; and,

[0010] A battery controller, comprising a controller housing and an electronic control component; the controller housing includes a controller side wall in a cylindrical shape; the electronic control component includes: an inner electrode for contacting and electrically connecting to the battery cell, a conversion circuit electrically connected to the inner electrode and performing voltage and / or current conversion thereon, and a positive electrode end cap electrically connected to the conversion circuit; the controller side wall is fixedly surrounded around the electronic control component to accommodate the electronic control component therein, and the positive electrode end cap of the electronic control component is exposed outside the controller side wall and protrudes outward along one axial end of the controller side wall; the controller side wall extends out of the electronic control component to form a battery cell connection portion, and the battery cell connection portion and the electronic control component together form a receiving cavity, and the electrical contact surface of the inner electrode for electrically connecting to the battery cell is exposed in the receiving cavity;

[0011] The battery cell connection portion of the controller side wall is sleeved on the outer periphery of the head of the battery cell, the head of the battery cell is received in the receiving cavity of the battery controller, and the head of the battery cell is in interference fit with the battery cell connection portion, and the positive electrode of the battery cell abuts against the inner electrode of the battery controller to achieve electrical connection.

[0012] In one embodiment, the outer periphery of the end of the head of the battery cell far from the main body has a chamfered corner circumferentially arranged along the circumference, and the chamfered corner makes the end of the head close to its positive electrode gradually reduce the diameter in the direction away from the main body.

[0013] In one embodiment, a rolling groove recessed in the direction of the axis of the battery cell is arranged around the junction of the head of the battery cell and the main body.

[0014] In one embodiment, a shoulder with a chamfered corner is formed at the junction of the main body of the battery cell and the rolling groove, the shoulder extends beyond the outer diameter of the head along the radial direction of the battery cell, and when the battery controller is docked with the battery cell, the battery cell connection portion abuts against the shoulder.

[0015] In one embodiment, the outer diameter of the head of the battery cell is greater than the inner diameter of the controller side wall, so that the head is in interference fit with the controller side wall;

[0016] The outer diameter of the controller side wall is the same as the outer diameter of the main body of the battery cell.

[0017] In one embodiment, the controller housing is made of a conductive metal material, the outer shell of the battery cell is also made of a conductive metal material, the negative electrode of the battery cell is arranged at one end of the outer shell of the battery cell opposite to the head and is electrically connected to the outer shell of the battery cell, and the controller housing is electrically connected to the outer shell of the battery cell.

[0018] In one embodiment, a plurality of welding holes are circumferentially and spacedly formed at the battery cell connection portion of the controller sidewall. The head of the battery cell is exposed through the welding holes, and the head of the battery cell is fixed to the controller sidewall through the welding holes.

[0019] The present invention also provides a battery controller, which includes:

[0020] A controller housing, including a controller sidewall in a cylindrical shape; and,

[0021] An electric control assembly, including: an inner electrode for contacting and electrically connecting a battery cell, a conversion circuit electrically connected to the inner electrode and performing voltage and / or current conversion thereon, and a positive electrode end cap electrically connected to the conversion circuit;

[0022] The controller sidewall is fixedly surrounded around the electric control assembly to accommodate the electric control assembly therein, and the positive electrode end cap of the electric control assembly protrudes outward along one axial end of the controller sidewall and is exposed outside the controller housing; the controller sidewall protrudes the electric control assembly in a direction away from the positive electrode end cap to form a battery cell connection portion, and the battery cell connection portion and the electric control assembly together form a receiving cavity for receiving the head of the battery cell, and the electrical contact surface of the inner electrode for electrically connecting the battery cell is exposed in the receiving cavity.

[0023] In one embodiment, a plurality of welding holes are circumferentially and spacedly formed at the battery cell connection portion of the controller sidewall.

[0024] In one embodiment, the electric control assembly further includes a circuit board, the positive electrode end cap is welded and fixed on a first surface of the circuit board, the controller housing further includes a controller end wall located at one end of the controller sidewall and perpendicular to the controller sidewall, the controller end wall is integrally formed with the controller sidewall, the controller end wall is welded and fixed on the first surface of the circuit board, the controller housing and the positive electrode end cap are both made of a conductive metal material, and the positive electrode end cap and the controller end wall are spaced apart from each other to form electrical insulation.

[0025] The present invention also provides a packaging method for a rechargeable battery, and the packaging method includes the following steps:

[0026] Provide a battery controller, and make the controller housing of the battery controller protrude from its electric control assembly to form a battery cell connection portion, so that the battery cell connection portion and the electric control assembly together form a receiving cavity;

[0027] Provide a battery cell, make it have a head with a smaller diameter and a body with a larger diameter, and make the positive electrode of the battery cell located at the outer end of the head;

[0028] Squeeze the head of the battery cell into the cell connection part of the battery controller, fix the head of the battery cell in the accommodation cavity by interference fit, and make the positive electrode of the battery cell abut against and be electrically connected to the electronic control component.

[0029] In one embodiment, a plurality of welding holes for exposing the head of the battery cell are arranged at intervals in the circumferential direction of the cell connection part, and the head of the battery cell is welded to the cell connection part by using the welding holes.

[0030] In one embodiment, a rolling groove is pressed between the head and the main part of the battery cell, so that a shoulder that radially exceeds the outer diameter of the head of the battery cell is formed at the junction of the main part of the battery cell and the rolling groove. When the head of the battery cell is squeezed into the cell connection part of the battery controller, the cell connection part abuts against the shoulder.

[0031] As can be seen from the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0032] The rechargeable battery of the present invention includes a battery cell and a battery controller. The battery cell has a head and a main part, and the outer diameter of its head is smaller than that of the main part, so that the battery cell presents a necked-down structure. The battery controller has a cell connection part, which can perform interference fit with the head of the battery cell to realize the encapsulation of the battery controller and the battery cell. The rechargeable battery can realize the connection between the two by means of interference fit. Compared with the traditional encapsulation process, laser welding is not required, thereby reducing the encapsulation difficulty and cost of the rechargeable battery.

[0033] At the same time, it is ensured that the encapsulation of the battery controller and the battery cell is realized without damaging the outer shell of the battery cell, reducing the probability of battery leakage, and even eliminating the phenomenon of battery leakage. This is a qualitative leap in improving the quality of rechargeable batteries and will greatly improve the competitiveness of products. Description of the Drawings

[0034] Figure 1 is a schematic structural diagram of the battery controller and the battery cell of the rechargeable battery in the present invention before assembly.

[0035] Figure 2 is a schematic structural diagram of the battery controller and the battery cell of the rechargeable battery in the present invention after assembly.

[0036] Figure 3 is in the present invention Figure 2 is a cross-sectional view taken along the I-I direction.

[0037] Figure 4 is a schematic structural diagram of the battery cell in the present invention.

[0038] Figure 5 is a schematic structural diagram of the battery controller in the present invention.

[0039] Figure 6 This is a cross-sectional view of the battery controller in the present invention.

[0040] The reference numerals are explained as follows: 1, rechargeable battery; 11, battery cell; 111, head; 1111, chamfered corner; 1112, rolling groove; 112, main body; 1121, shoulder; 12, battery controller; 121, positive electrode end cap; 122, controller housing; 1221, controller side wall; 1222, controller end wall; 1223, welding hole; 1225, battery cell connection part. Detailed Embodiment

[0041] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments, all of which do not depart from the scope of the present invention, and the descriptions and illustrations therein are for illustrative purposes in nature and not intended to limit the present invention.

[0042] To further illustrate the principle and structure of the present invention, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0043] The present invention provides a rechargeable battery, which includes a battery cell and a battery controller. The battery cell and the battery controller can be encapsulated through interference fit. Compared with the traditional encapsulation process, laser welding is not required, thereby reducing the encapsulation difficulty and cost of the rechargeable battery.

[0044] Refer to Figure 1 , Figure 2 and Figure 3 , which respectively show the structures of the rechargeable battery 1 before and after encapsulation. The battery controller 12 and the battery cell 11 will be specifically described below.

[0045] The battery cell 11 is a lithium-ion battery cell 11, which has a positive electrode and a negative electrode.

[0046] The material of the outer shell of the battery cell 11 is a metal conductive material. Exemplarily, for example, iron or steel.

[0047] Refer to Figure 4 , the outer shell of the battery cell 11 sequentially includes a head 111 and a main body 112 along its axial direction. Among them, the positive electrode is disposed at one end of the head 111 facing away from the main body 112, and the negative electrode is disposed at one end of the main body 112 facing away from the head 111. The negative electrode is electrically connected to the outer shell of the battery cell 11, so that the entire outer shell of the battery cell 11 becomes the negative electrode.

[0048] The outer shape of the head 111 is cylindrical, and its outer diameter is smaller than the outer diameter of the main body 112, so that the battery cell 11 presents a necked structure.

[0049] The outer periphery of the end of the head 111 away from the main body 112 has a circumferentially arranged rounded corner 1111, and this rounded corner 1111 causes the diameter of one end of the head 111 near its positive electrode to gradually decrease in the direction away from the main body 112.

[0050] The overall shape of the main body 112 is cylindrical.

[0051] A rolling groove 1112 recessed in the direction of the axis of the battery cell 11 is provided in a ring at the junction of the head 111 and the main body 112. The structure of this rolling groove 1112 not only limits the winding core of the battery cell 11, but also facilitates the docking of the head 111 and the main body 112, and further facilitates the sealing of the outer shell of the battery cell 11.

[0052] Furthermore, a shoulder 1121 with a rounded corner 1111 is formed at the junction of the main body 112 and the rolling groove 1112. This shoulder 1121 extends beyond the outer diameter of the head 111 in the radial direction of the battery cell 11.

[0053] Refer to Figure 5 and Figure 6 , the battery controller 12 includes an electric control component and a controller housing 122.

[0054] The electric control component includes an inner electrode, a conversion circuit, a positive electrode end cap 121, and a circuit board.

[0055] The circuit board has a first surface and a second surface arranged opposite to each other.

[0056] The positive electrode end cap 121 is welded and fixed to the first surface of the circuit board. The positive electrode end cap 121 is made of a conductive metal material, and it can be fixed to the circuit board by welding and achieve electrical connection, and then be electrically connected to the conversion circuit through the circuit board.

[0057] The conversion circuit is mainly used to convert the non-standard voltage and current output of the battery cell 11 into a voltage and current output that complies with the GB / T8897.2 (IEC60086-2) standard. For a rechargeable battery with a built-in charging module, the conversion circuit is also used to convert the external voltage and current obtained at the positive electrode end cap 121 and charge the battery cell 11 through the inner electrode. The conversion circuit is electrically connected to the inner electrode, and the inner electrode is electrically connected to the positive electrode of the battery cell 11. Thus, the battery cell 11 can be electrically connected to the conversion circuit through the inner electrode, and the voltage and / or current can be converted into a voltage and current that complies with the GB / T 8897.2 (IEC60086-2) standard through the conversion circuit, and be output to the outside through the positive electrode end cap 121.

[0058] The inner electrode is located at the second surface of the circuit board and is used to contact and electrically connect to the positive electrode of the battery cell 11. Specifically, the inner electrode can be provided with an elastic boss, and the elastic boss abuts against the boss of the positive electrode, so as to realize the abutment of the inner electrode and the positive electrode.

[0059] The inner electrode can be made of a conductive metal material, which can be fixed to the circuit board by welding and achieve electrical connection, and then be electrically connected to the conversion circuit through the circuit board. That is, both the positive electrode end cap 121 and the inner electrode are electrically connected to the conversion circuit through the circuit board. When the rechargeable battery is in the discharge mode, the inner electrode serves as the discharge input end of the conversion circuit, and the positive electrode end cap 121 serves as the discharge output end of the conversion circuit; while when the rechargeable battery is in the charging mode, the positive electrode end cap 121 serves as the charging input end of the conversion circuit, and the inner electrode serves as the charging input end of the conversion circuit.

[0060] The controller housing 122 is electrically connected to the outer shell of the battery cell 11. Specifically, the controller housing 122 includes a controller end wall 1222 and a controller side wall 1221 that are integrally formed. Among them, both the controller end wall 1222 and the controller side wall 1221 of the controller housing 122 are made of a conductive metal material. For example, iron or steel.

[0061] The controller side wall 1221 is cylindrical, and its inner diameter is smaller than the outer diameter of the head 111 of the battery cell 11, that is, the outer diameter of the head 111 is slightly larger than the inner diameter of the controller side wall 1221, so that the head 111 can be inserted into the controller side wall 1221 and have an interference fit with the controller side wall 1221.

[0062] At the same time, the outer diameter of the controller side wall 1221 is the same as the outer diameter of the main body 112 of the battery cell 11.

[0063] The controller side wall 1221 is circumferentially fixed around the electronic control component, that is, the electronic control component is received inside the controller side wall 1221. Specifically, in this embodiment, the axial direction of the controller side wall 1221 is the same as the axial direction of the circuit board.

[0064] Among them, the positive electrode end cap 121 is exposed outside the controller side wall 1221 and protrudes outward along one end of the axial direction of the controller side wall 1221.

[0065] The controller side wall 1221 extends out of the electronic control component to form a battery cell connection portion 1225, and the battery cell connection portion 1225 and the electronic control component together form a receiving cavity.

[0066] The electrical contact surface of the inner electrode for electrically connecting the battery cell 11 is exposed in the receiving cavity. In this embodiment, the electrical contact surface of the inner electrode is an elastic convex platform contact surface.

[0067] The battery cell connection portion 1225 is cylindrical. After it is connected to the head 111 of the battery cell 11 with an interference fit. And because the outer diameter of the controller side wall 1221 is the same as the outer diameter of the main body 112 of the battery cell 11, after the battery cell 11 is connected to the battery controller 12, the main body 112 is flush with the outer periphery of the controller housing 122.

[0068] A plurality of welding holes 1223 are circumferentially spaced at the cell connection portion 1225. Specifically, in this embodiment, the plurality of welding holes 1223 are evenly arranged along the circumference of the controller side wall 1221. In other embodiments, the welding holes 1223 can also be arranged according to actual situations.

[0069] Each welding hole 1223 is elongated, and its length extends along the axial direction of the controller side wall 1221. The axis of each welding hole 1223 extends along the radial direction of the controller side wall 1221. The processing difficulty of the welding hole 1223 with an elongated structure is relatively low, thereby reducing the processing difficulty of the controller side wall 1221.

[0070] In the controller housing 122 of this embodiment, its length in the axial direction is greater than that of the traditional controller housing 122, and thus has a cell connection portion 1225 that can be sleeved around the periphery of the head 111. And after the controller housing 122 and the cell 11 are encapsulated, the axial length of the rechargeable battery 1 still meets the national standard requirements for the length of the battery.

[0071] The controller end wall 1222 is located at one end of the controller side wall 1221 close to the positive electrode end cap 121 and is perpendicular to the controller side wall 1221. The controller end wall 1222 is welded and fixed to the first surface of the circuit board, and the controller end wall 1222 and the positive electrode end cap 121 are spaced apart from each other to form electrical insulation.

[0072] When the cell connection portion 1225 of the controller side wall 1221 is sleeved around the outer periphery of the head 111 of the cell 11, the head 111 of the cell 11 first extends into the cell connection portion 1225. At this time, the chamfer 1111 on the head 111 first enters the accommodation cavity. The structure of the chamfer 1111 plays a guiding role, making the connection between the controller side wall 1221 and the head 111 easier.

[0073] After the head 111 of the cell 11 is squeezed into the cell connection portion 1225, the cell connection portion 1225 abuts against the shoulder 1121. That is, the cell connection portion 1225 abuts against the shoulder 1121 of the cell 11.

[0074] In this embodiment, when the controller housing 122 and the cell 11 are docked, the connection between the two is achieved through the interference fit between the head 111 and the cell connection portion 1225 of the controller side wall 1221, and the positive electrode of the cell 11 abuts against the inner electrode of the battery controller 12 to achieve electrical connection. And after the two are assembled, the axial length of the controller housing 122 and the cell 11, that is, the length of the rechargeable battery 1, still meets the national standard requirements.

[0075] Furthermore, after the controller housing 122 and the cell 11 are in interference fit, the connection strength between the controller housing 122 and the cell 11 can also be increased by welding the cell 11 and the cell connection portion 1225 at the welding holes 1223.

[0076] Specifically, at the welding hole 1223, the head 111 of the battery cell 11 is exposed to the outside through the welding hole 1223, thereby forming a welding surface. The welding surface and the peripheral walls of the welding hole 1223 are welded to achieve the welded connection between the head 111 of the battery cell 11 and the battery cell connection part 1225. After welding and fixing, the rotation of the head 111 along the circumferential direction with respect to the extended housing is avoided, thereby increasing the connection strength between the head 111 and the battery cell connection part 1225.

[0077] Furthermore, the welding spots after welding between the head 111 of the battery cell 11 and the battery cell connection part 1225 do not exceed the outer peripheral surface of the battery cell connection part 1225, which can ensure that the appearance is more beautiful after the label is heat-shrunk.

[0078] The provision of the welding hole 1223 can also cause the gas to leak from the welding hole 1223 when the pressure in the battery cell 11 becomes too high due to aging or abnormal use, thereby playing a role in pressure relief and avoiding or reducing the possibility of the rechargeable battery exploding.

[0079] The rechargeable battery 1 in this embodiment is connected by the interference fit between the head 111 and the battery cell connection part 1225 supplemented by welding connection. This connection strength can ensure the compressive stress received by the rechargeable battery 1 during use.

[0080] Therefore, compared with the laser sealing and welding process in the related art, the interference fit supplemented by welding in this embodiment realizes the connection with the battery controller 12 without damaging the outer casing of the battery cell 11, naturally reducing the proportion of battery liquid leakage and even preventing the occurrence of liquid leakage. This is a qualitative leap in product quality improvement and will greatly enhance the competitiveness of the product.

[0081] The present invention also provides a packaging method for the rechargeable battery 1, including the following steps:

[0082] S1. Provide a battery cell 11 having a head 111 with a smaller diameter and a main part 112 with a larger diameter, and make the positive electrode of the battery cell 11 located at the outer end of the head 111.

[0083] Specifically, the battery cell 11 is a lithium-ion battery cell 11, which has a positive electrode and a negative electrode.

[0084] The material of the outer casing of the battery cell 11 is a metal conductive material. Exemplarily, for example, iron or steel.

[0085] Refer to Figure 4, the outer shell of the battery cell 11 sequentially includes a head 111 and a main body 112 along its axial direction. Among them, the positive electrode is disposed at one end of the head 111, and the negative electrode is disposed at one end of the main body 112 facing away from the head 111. The negative electrode is electrically connected to the outer shell of the battery cell 11, making the entire outer shell of the battery cell 11 the negative electrode.

[0086] The outer shape of the head 111 is cylindrical, and its outer diameter is smaller than that of the main body 112, making the battery cell 11 have a necked-down structure.

[0087] The outer periphery of the end of the head 111 far from the main body 112 is provided with a chamfer 1111 arranged in a circumferential ring. The chamfer 1111 makes the diameter of one end of the head 111 close to its positive electrode gradually decrease in the direction away from the main body 112.

[0088] The outer shape of the main body 112 is generally cylindrical.

[0089] A rolling groove 1112 recessed toward the axis of the battery cell 11 is arranged in a circumferential ring at the junction of the head 111 and the main body 112. The structure of the rolling groove 1112 not only limits the winding core of the battery cell 11 but also facilitates the docking of the head 111 and the main body 112, and further facilitates the sealing of the outer shell of the battery cell 11.

[0090] Furthermore, a shoulder 1121 with a chamfer 1111 is formed at the junction of the main body 112 and the rolling groove 1112. The shoulder 1121 extends beyond the outer diameter of the head 111 along the radial direction of the battery cell 11.

[0091] S2. Provide a battery controller 12, making the controller housing 122 of the battery controller 12 protrude from its electronic control component to form a battery cell connection part 1225, so that the battery cell connection part 1225 and the electronic control component together form a receiving cavity.

[0092] Specifically, the battery controller 12 includes an electronic control component and a controller housing 122.

[0093] The electronic control component includes an internal electrode, a conversion circuit, a positive electrode end cover 121, and a circuit board.

[0094] The circuit board has a first surface and a second surface arranged opposite to each other. The first surface of the circuit board is welded and fixed to the positive electrode end cover 121.

[0095] The positive electrode end cover 121 is welded and fixed to the first surface of the circuit board. The positive electrode end cover 121 is made of a conductive metal material. And the positive electrode end cover 121 is electrically connected to the conversion circuit.

[0096] The conversion circuit is located at the second surface of the circuit board, and the conversion circuit is electrically connected to the internal electrode and performs voltage and / or current conversion on it.

[0097] The inner electrode is located at the second surface of the circuit board and is used to contact and electrically connect to the positive electrode of the battery cell 11.

[0098] The controller housing 122 is electrically connected to the outer shell of the battery cell 11. Specifically, the controller housing 122 includes an integrally formed controller end wall 1222 and controller side walls 1221. Among them, both the controller end wall 1222 and the controller side walls 1221 of the controller housing 122 are made of conductive metal materials.

[0099] The controller side walls 1221 are cylindrical, and their inner diameter is smaller than the outer diameter of the head 111 of the battery cell 11, that is, the outer diameter of the head 111 is greater than the inner diameter of the controller side walls 1221, so that the head 111 and the controller side walls 1221 are in interference fit.

[0100] At the same time, the outer diameter of the controller side walls 1221 is the same as the outer diameter of the main body 112 of the battery cell 11. After the head 111 of the battery cell 11 and the battery cell connection part 1225 are in interference fit to achieve connection, the main body 112 is flush with the outer periphery of the controller housing 122.

[0101] The controller side walls 1221 are circumferentially fixed around the electronic control assembly, that is, the electronic control assembly is housed inside the controller side walls 1221. Specifically, in this embodiment, the axial direction of the controller side walls 1221 is the same as the axial direction of the circuit board.

[0102] Among them, the positive electrode end cover 121 of the electronic control assembly is exposed outside the controller side walls 1221 and protrudes outward along one axial end of the controller side walls 1221.

[0103] The controller side walls 1221 protrude from the electronic control assembly in the direction away from the positive electrode end cover 121 to form a battery cell connection part 1225, and the battery cell connection part 1225 and the electronic control assembly together form a receiving cavity. The electrical contact surface of the inner electrode for electrically connecting to the battery cell 11 is exposed in the receiving cavity.

[0104] In the controller housing 122 of this embodiment, its axial length is greater than the length of the traditional controller housing 122, and thus has a battery cell connection part 1225 that can be sleeved around the periphery of the head 111. After the controller housing 122 and the battery cell 11 are encapsulated, the axial length of the rechargeable battery 1 still meets the national standard requirements for the length of the battery.

[0105] The controller end wall 1222 is located at one end of the controller side walls 1221 close to the positive electrode end cover 121 and is perpendicular to the controller side walls 1221. The controller end wall 1222 is welded and fixed to the first surface of the circuit board, and the controller end wall 1222 and the positive electrode end cover 121 are spaced apart from each other to form electrical insulation.

[0106] Among them, S1 and S2 can be carried out simultaneously, or S2 can be carried out first and S1 later.

[0107] S3. Squeeze the head 111 of the battery cell 11 into the cell connection part 1225 of the battery controller 12, fix the head 111 of the battery cell 11 in the accommodation cavity by interference fit, and make the positive electrode of the battery cell 11 abut against and be electrically connected to the electronic control component.

[0108] Further, a rolling groove 1112 can be pressed between the head 111 and the main part 112 of the battery cell 11, so that a shoulder 1121 that radially exceeds the outer diameter of the head 111 of the battery cell 11 is formed at the junction of the main part 112 of the battery cell 11 and the rolling groove 1112. After the head 111 of the battery cell 11 is squeezed into the cell connection part 1225 of the battery controller 12, the cell connection part 1225 abuts against the shoulder 1121.

[0109] S4. A plurality of welding holes 1223 exposing the head 111 of the battery cell 11 are circumferentially spaced apart in the cell connection part 1225, and the head 111 of the battery cell 11 is welded to the cell connection part 1225 by using the welding holes 1223.

[0110] Specifically, a plurality of welding holes 1223 are circumferentially spaced apart at the cell connection part 1225. Specifically, in this embodiment, the plurality of welding holes 1223 are uniformly arranged along the circumference of the controller side wall 1221. In other embodiments, the welding holes 1223 can also be arranged according to actual situations.

[0111] Each of the welding holes 1223 is in a long shape, and its length extends along the axial direction of the controller side wall 1221. The axes of each of the welding holes 1223 extend along the radial direction of the controller side wall 1221. The processing difficulty of the long-shaped welding holes 1223 is relatively low, thereby reducing the processing difficulty of the controller side wall 1221.

[0112] Among them, the welding is carried out by means of resistance welding or spot tin welding, and the welding spots do not exceed the outer peripheral surface of the extended housing.

[0113] The packaging method of the rechargeable battery 1 in the present invention has a simple process, strong operability, and is suitable for mass production.

[0114] As can be seen from the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0115] The rechargeable battery of the present invention includes a battery cell and a battery controller. The battery cell has a head and a main part, and the outer diameter of its head is smaller than the outer diameter of the main part, so that the battery cell presents a necked-down structure. The battery controller has a cell connection part, which can be in interference fit with the head of the battery cell, thereby realizing the packaging of the battery controller and the battery cell. The rechargeable battery can realize the connection between the two by means of interference fit. Compared with the traditional packaging process, laser welding is not required, thereby reducing the packaging difficulty and packaging cost of the rechargeable battery.

[0116] Meanwhile, it ensures the encapsulation of the battery controller and the battery cell without damaging the outer shell of the battery cell, reduces the probability of battery leakage, and even eliminates the phenomenon of battery leakage. This is a qualitative leap in improving the quality of rechargeable batteries and will greatly enhance the competitiveness of products.

[0117] Although the present invention has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative 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, such as the connection between the controller and the battery cell. In addition to interference press fitting, there are also methods of filling adhesive in the rolling groove of the battery cell and wire filling welding; the inner electrode circuit board can also use tracking resistant insulating plastics, etc. Instead, it should be broadly interpreted within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A rechargeable battery, characterized in that, it includes: a battery cell, which is a lithium-ion battery cell and has a positive electrode and a negative electrode; the outer shell of the battery cell includes a cylindrical main body and a head with a cylindrical outer shape formed at one axial end of the main body, the outer diameter of the head of the battery cell is smaller than the outer diameter of the main body, the positive electrode is arranged at one end of the head, and the negative electrode is arranged at one end of the main body facing away from the head; and, a battery controller, including a controller housing and an electronic control component; the controller housing includes a cylindrical controller side wall; the electronic control component includes: an inner electrode for contacting and electrically connecting the battery cell, a conversion circuit electrically connected to the inner electrode and performing voltage and / or current conversion on it, and a positive electrode end cover electrically connected to the conversion circuit; the controller side wall is fixedly surrounded around the electronic control component to accommodate the electronic control component therein, and the positive electrode end cover of the electronic control component is exposed outside the controller side wall and protrudes outward along one axial end of the controller side wall; the controller side wall extends out of the electronic control component to form a battery cell connection part, and the battery cell connection part and the electronic control component together form a receiving cavity, and the electrical contact surface of the inner electrode for electrically connecting the battery cell is exposed in the receiving cavity; the battery cell connection part of the controller side wall is sleeved on the outer periphery of the head of the battery cell, the head of the battery cell is received in the receiving cavity of the battery controller, and the head of the battery cell is in interference fit with the battery cell connection part, and the positive electrode of the battery cell abuts against the inner electrode of the battery controller to achieve electrical connection.

2. The rechargeable battery according to claim 1, characterized in that, the outer periphery of the end of the head of the battery cell away from the main body has a chamfered corner circumferentially arranged along the circumference, and the chamfered corner makes the end of the head close to its positive electrode gradually taper in diameter along the direction away from the main body.

3. The rechargeable battery according to claim 1, characterized in that, a rolling groove recessed in the direction of the axis of the battery cell is arranged around the junction of the head and the main body of the battery cell.

4. The rechargeable battery according to claim 3, characterized in that, a shoulder with a chamfered corner is formed at the junction of the main body of the battery cell and the rolling groove, and the shoulder extends beyond the outer diameter of the head along the radial direction of the battery cell. When the battery controller is docked with the battery cell, the battery cell connection part abuts against the shoulder.

5. The rechargeable battery according to claim 1, characterized in that, the outer diameter of the head of the battery cell is larger than the inner diameter of the controller side wall, so that the head is in interference fit with the controller side wall; the outer diameter of the controller side wall is the same as the outer diameter of the main body of the battery cell.

6. The rechargeable battery according to claim 1, characterized in that, the controller housing is made of a conductive metal material, the outer shell of the battery cell is also made of a conductive metal material, the negative electrode of the battery cell is arranged at one end of the outer shell of the battery cell relative to the head and is electrically connected to the outer shell of the battery cell, and the controller housing is electrically connected to the outer shell of the battery cell.

7. The rechargeable battery according to claim 1, characterized in that, A plurality of welding holes are circumferentially spaced at the battery cell connection portion of the side wall of the controller. The head of the battery cell is exposed through the welding holes, and the head of the battery cell is fixed to the side wall of the controller through the welding holes.

8. A battery controller characterized in that the battery controller comprises: a controller housing including a cylindrical controller side wall for sleeving around the outer periphery of the head of the battery cell and electrically connecting to the outer shell of the battery cell; and an electronic control assembly including: an inner electrode for contacting and electrically connecting to the battery cell, a conversion circuit electrically connected to the inner electrode and performing voltage and / or current conversion thereon, and a positive electrode end cap electrically connected to the conversion circuit; the controller side wall is fixedly surrounded around the electronic control assembly to accommodate the electronic control assembly therein, and the positive electrode end cap of the electronic control assembly protrudes outward along one axial end of the controller side wall and is exposed outside the controller housing; the controller side wall protrudes from the electronic control assembly in a direction away from the positive electrode end cap to form a battery cell connection portion, the battery cell connection portion and the electronic control assembly together form a receiving cavity for receiving the head of the battery cell, the battery cell connection portion is used for sleeving around the outer periphery of the head of the battery cell, and the electrical contact surface of the inner electrode for electrically connecting to the battery cell is exposed in the receiving cavity.

9. The battery controller according to claim 8 characterized in that a plurality of welding holes are circumferentially spaced at the battery cell connection portion of the controller side wall.

10. The battery controller according to claim 8 characterized in that the electronic control assembly further includes a circuit board, the positive electrode end cap is welded and fixed on the first surface of the circuit board, the controller housing further includes a controller end wall located at one end of the controller side wall and perpendicular to the controller side wall, the controller end wall is integrally formed with the controller side wall, the controller end wall is welded and fixed on the first surface of the circuit board, the controller housing and the positive electrode end cap are both made of conductive metal materials, and the positive electrode end cap and the controller end wall are spaced apart from each other to form electrical insulation.

11. A packaging method for a rechargeable battery characterized in that the packaging method includes the following steps: providing a battery cell having a head with a smaller diameter and a body with a larger diameter, and making the positive electrode of the battery cell located at the outer end of the head; providing a battery controller such that the controller housing of the battery controller protrudes from its electronic control assembly to form a battery cell connection portion, so that the battery cell connection portion and the electronic control assembly together form a receiving cavity; squeezing the head of the battery cell into the battery cell connection portion of the battery controller, fixing the head of the battery cell in the receiving cavity by interference fit, and making the positive electrode of the battery cell abut against and electrically connect to the electronic control assembly.

12. The packaging method for a rechargeable battery according to claim 11 characterized in that a plurality of welding holes exposing the head of the battery cell are circumferentially spaced at the battery cell connection portion, and the head of the battery cell is welded to the battery cell connection portion by using the welding holes.

13. The packaging method for a rechargeable battery according to claim 11 characterized in that Press a rolling groove between the head and the main body of the battery cell, so that a shoulder extending radially beyond the outer diameter of the head of the battery cell is formed at the junction of the main body of the battery cell and the rolling groove. When the head of the battery cell is inserted into the cell connection part of the battery controller, the cell connection part abuts against the shoulder.

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