CN210403781U

CN210403781U - Battery module and device using battery module as power supply

Info

Publication number: CN210403781U
Application number: CN202020396590.5U
Authority: CN
Inventors: 薛丹月; 陈宜锋; 王庆; 任帅; 陈彬彬
Original assignee: Jiangsu Contemporary Amperex Technology Ltd
Current assignee: Jiangsu Contemporary Amperex Technology Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-04-24
Anticipated expiration: 2030-03-25

Abstract

The utility model relates to a battery module and use device of battery module as power. The battery module includes: the secondary battery comprises a shell and a top cover, wherein the top cover is connected with the shell, and a fixing part is formed at the connection part; the insulating part sets up in secondary cell's tip, has the cavity between tip and the insulating part, and at least part fixed part corresponds the setting with the cavity, and the cavity is used for dodging the fixed part. The utility model discloses a fixed part on the secondary battery among the battery module is difficult for taking place the contact collision with the insulating part to reduce the fixed part and receive the impulsive force effect and lead to the fixed part to take place the possibility of fracture.

Description

Battery module and device using battery module as power supply

Technical Field

The utility model relates to a battery technology field especially relates to a battery module and use device of battery module as power.

Background

With the development of scientific technology, the field of application of rechargeable secondary batteries is becoming more and more extensive, for example, secondary batteries may be used in automobiles, electric bicycles, wireless electric tools, and the like. The secondary battery includes a case and an electrode assembly enclosed in the case. A plurality of secondary batteries are accommodated in the case, but the secondary batteries are found to be cracked during the use of the secondary batteries, causing the leakage of electrolyte, which affects the safety of the secondary batteries during the use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery module and use battery module as the device of power, the fixed part on the secondary battery in the battery module is difficult for taking place the contact collision with the insulating part to reduce the fixed part and receive the impact force effect and lead to the fixed part to take place the possibility of fracture.

On the one hand, the utility model provides a battery module, it includes:

the secondary battery comprises a shell and a top cover, wherein the top cover is connected with the shell, and a fixing part is formed at the connection part; the insulating part sets up in secondary cell's tip, has the cavity between tip and the insulating part, and at least part fixed part corresponds the setting with the cavity, and the cavity is used for dodging the fixed part.

According to an aspect of the present invention, the insulating member or the secondary battery includes a concave portion, the concave portion is provided corresponding to the fixing portion, and the concave portion forms a cavity.

According to an aspect of the utility model, the insulating part still includes the portion of holding, and secondary battery's tip is pegged graft in the portion of holding in order to be spacing by the insulating part, concave part and the portion of holding intercommunication.

According to one aspect of the present invention, the concave portion is provided in the insulating member, the accommodating portion has a bottom wall disposed opposite to the end surface of the end portion, and the concave portion is located in the bottom wall;

and/or the presence of a gas in the gas,

the accommodating portion has a side wall disposed opposite to a circumferential direction of the end portion, and the recess is located in the side wall.

According to an aspect of the present invention, the concave portion is provided in the secondary battery, the concave portion is provided in the end surface of the secondary battery and/or the circumferential surface of the secondary battery, and the fixing portion is provided corresponding to the concave portion.

According to an aspect of the present invention, the battery module further includes a buffer member, at least a part of which is located in the cavity and isolates the fixing portion and the insulating member.

According to an aspect of the present invention, the buffer member covers the fixing portion.

According to an aspect of the present invention, the accommodating portion has a gap with the end portion in a radial direction of the end portion, and a part of the buffer member is located in the gap to restrict the end portion from moving in the radial direction.

According to an aspect of the utility model, the fixed part is the welding seam that top cap and casing connection formed.

According to the utility model discloses a battery module includes secondary battery and insulating part. The joint of the top cover and the shell of the secondary battery forms a fixing part. The insulating member is provided at an end portion of the secondary battery. The secondary battery has a cavity between an end portion thereof and the insulating member. When the battery module falls or impacts and vibrates, the secondary battery and the insulating part move relatively. Because the cavity can avoid the fixing part, when the secondary battery and the insulating member move relatively, the fixing part on the secondary battery is not easy to contact and collide with the insulating member, so that the possibility of contact and collision between the part, corresponding to the cavity, on the fixing part and the insulating member is reduced, the possibility of cracking of the fixing part caused by the impact force of collision from the outside on the fixing part is reduced, and the use safety of the battery module is improved.

In another aspect, according to the present invention, there is provided a device using a battery module as a power source, which includes the battery module as described above, the battery module being used for supplying electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present invention will be described below by referring to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a battery module disclosed in the present invention;

fig. 2 is a schematic view illustrating an exploded structure of a battery module according to the present invention;

FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention taken along the line A-A in FIG. 1;

fig. 4 is a schematic view of a partial structure of a secondary battery according to an embodiment of the present invention;

FIG. 5 is an enlarged view at B in FIG. 3;

fig. 6 is a schematic view of a partial cross-sectional structure of a battery module according to an embodiment of the present invention;

fig. 7 is a schematic view of a partial structure of a secondary battery according to another embodiment of the present invention;

fig. 8 is a schematic view of a battery module according to another embodiment of the present invention;

fig. 9 is a schematic view of a battery module according to another embodiment of the present invention;

fig. 10 is a schematic view of a battery module according to another embodiment of the present invention;

fig. 11 is a schematic view of a partial cross-sectional structure of a battery module according to still another embodiment of the present invention.

In the drawings, the drawings are not necessarily drawn to scale.

Description of the labeling:

10. a battery module;

20. a box body;

30. a secondary battery; 30a, end portions; 30b, and a second side wall; a fixed part; 31. a housing; 32. a top cover; 33. an electrode assembly; 34. an electrode terminal;

40. an insulating member; 41. an accommodating portion; 411. a side wall; 412. a bottom wall;

50. an upper cover body;

60. a lower cover body;

70. a buffer member;

99. a cavity;

100. a recess;

x, axial direction.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like, indicate orientations or positional relationships only for convenience in describing the present invention and to simplify the description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The directional terms appearing in the following description are directions shown in the drawings and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

When the problem of electrolyte leakage of the secondary battery in the prior art is solved, the applicant optimizes the fixation of the secondary battery and the overall strength of the box body. However, after a period of use, the problem of electrolyte leakage still occurs. Accordingly, the applicant has conducted research and analysis on the respective structures of the secondary battery and found that the case is generally of a split structure in order to facilitate smooth installation of the electrode assembly into the case during the design process. After the electrode assembly is mounted to a predetermined position, the respective parts included in the case are joined to enclose the electrode assembly. The fixing part is formed after the parts are spliced. In order to ensure the safety of the entire secondary battery, the secondary battery is generally isolated by an insulating member. Finally, the applicant has found that the case of the secondary battery includes various parts and components which are cracked at the splicing position, so that the electrolyte in the case leaks to the outside of the case from the cracked position, thereby causing the secondary battery to have poor electrochemical performance and safety performance. The applicant further studies and analyzes the problem that the shell of the secondary battery cracks, and finds that the cracking of the shell is not caused by the processing technology and the splicing mode of the shell, but the secondary battery can be subjected to the impact of falling, vibration and the like in the using process to cause the position of the secondary battery to move, so that the splicing position of each part and the adjacent insulating part are in contact collision, and the splicing position of each part is cracked under the action of the impact force.

For a better understanding of the present invention, it will be described below with reference to fig. 1 to 11.

The utility model discloses an use device of battery module as power. The device may be, but is not limited to, a vehicle, a boat, an aircraft, or a power tool, etc. One embodiment of the present invention provides a vehicle, which includes a vehicle main body and a battery module 10. The battery module 10 is provided in a vehicle body. The vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle. The vehicle body is provided with a drive motor electrically connected to the battery module 10. The battery module 10 supplies power to the driving motor. The driving motor is connected with wheels on the vehicle body through a transmission mechanism, so that the automobile is driven to move. Alternatively, the battery module 10 may be horizontally disposed at the bottom of the vehicle body.

Referring to fig. 1 and 2, the present invention discloses a battery module 10, wherein the battery module 10 includes a case 20, a secondary battery 30, an insulator 40, an upper cover 50, and a lower cover 60. The case 20 has a cylindrical structure with two opposite openings. The secondary battery 30 may be loaded into the case 20 through one of the openings. The upper cover 50 and the lower cover 60 are respectively disposed at opposite ends of the case 20 and close the corresponding openings. The insulating member 40 is disposed between the upper cover 50 and the secondary battery 30, and/or the insulating member 40 is disposed between the lower cover 60 and the secondary battery 30. Preferably, the insulating member 40 is disposed between the upper cover 50 and the secondary battery 30 and between the lower cover 60 and the secondary battery 30. The two insulators 40 are provided at intervals in the axial direction X of the secondary battery 30. The two insulators 40 are provided corresponding to the two end portions 30a of the secondary battery 30, respectively, and are capable of pressing the secondary battery 30 in the axial direction X through the end portions 30a, thereby restricting positional movement of the secondary battery 30 in the axial direction X. The insulating member 40 can insulate and isolate the secondary battery 30 from other adjacent structural members, such as a bus member, a circuit board, or a wire harness, and improve the safety of the secondary battery 30 in use. In one example, the insulator 40 is a one-piece injection molded structure. Referring to FIG. 2, the housing 20 is shown as a square or other shape. The case 20 may be made of a material such as aluminum, aluminum alloy, or plastic.

The secondary battery 30 includes a case 31, an electrode assembly 33 disposed within the case 31, a top cap 32 hermetically connected to the case 31, and electrode terminals 34 disposed on the top cap 32. Referring to fig. 2, the number of the secondary batteries 30 provided in the case 20 may be plural. The plurality of secondary batteries 30 may be connected in series or in parallel with each other by the bus member. The bus member is electrically connected to the electrode terminal 34.

The housing 31 of the present invention is a cylindrical structure. It will be appreciated that the housing 31 may also be square or other shape. The case 31 has an inner space accommodating the electrode assembly 33 and the electrolyte and an opening communicating with the inner space. The housing 31 may be made of a material such as aluminum, aluminum alloy, or plastic.

The utility model discloses an electrode assembly 33 accessible piles up or convolutes first pole piece, second pole piece and the diaphragm that is located between first pole piece and the second pole piece together and forms the main part, and wherein, the diaphragm is the insulator between first pole piece and second pole piece. The main body part is provided with two opposite end surfaces. In the present invention, the first pole piece is exemplarily used as the positive pole piece, and the second pole piece is used as the negative pole piece for illustration. The positive electrode sheet active material is coated on the coating region of the positive electrode sheet, and the negative electrode sheet active material is coated on the coating region of the negative electrode sheet. A plurality of uncoated regions extending from the coated region of the body portion are laminated as tabs. The electrode assembly 33 includes two tabs, i.e., a positive tab and a negative tab. The positive tab extends from the coated region of the positive tab and the negative tab extends from the coated region of the negative tab. The utility model discloses in, extend a utmost point ear on two relative terminal surfaces of main part respectively. The same polarity tab is connected to the electrode terminal 34.

The top cover 32 of the present invention has an outer surface and an inner surface opposite to each other in the axial direction X of the secondary battery 30, and an electrode lead-out hole. The top cover 32 is a plate-like structure. The top cover 32 can cover the opening of the housing 31 and be connected with the housing 31 in a sealing manner. The electrode terminal 34 is provided at the top cap 32 and is disposed corresponding to the electrode lead-out hole. A part of the electrode terminal 34 is exposed to the outer surface of the top cover 32 and is used for welding with the bus bar member. The housing 31 has a cylindrical structure and has two openings. The number of the top covers 32 is two. Two top covers 32 are respectively provided at both end portions 30a of the housing 31 to cover the corresponding openings. Two electrode terminals 34 having opposite polarities are respectively disposed on the corresponding top caps 32. The number of the insulating members 40 is two. One insulating member 40 is disposed between the upper cover 50 and the secondary battery 30, and the other insulating member 40 is disposed between the lower cover 60 and the secondary battery 30.

Referring to fig. 2 to 5, the top cover 32 and the case 31 are joined to each other to form an outer case of the secondary battery 30. After the top cover 32 and the housing 31 are coupled and fixed to each other, a fixing portion 30b is formed at the coupling portion of the two. The fixing portion 30b is located at an end 30a of the secondary battery 30. After the assembly work of the battery module 10 is completed, the end 30a of the secondary battery 30 and the insulator 40 have a cavity 99 therebetween.

In one example, the entire retainer portion 30b is disposed in correspondence with the cavity 99. The cavity 99 is a space to be evacuated, and can be evacuated from the fixing portion 30 b. When the battery module 10 itself is subjected to an external impact, there is a relative movement between the secondary battery 30 and the insulator 40. Since the cavity 99 is provided between the end 30a of the secondary battery 30 and the insulating member 40, the cavity 99 can absorb the relative displacement between the fixing portion 30b and the insulating member 40, so that when the secondary battery 30 and the insulating member 40 move relative to each other, the fixing portion 30b is not easily contacted with the insulating member 40, the possibility of contact collision between the fixing portion 30b and the insulating member 40 is effectively reduced, and the possibility of cracking of the fixing portion 30b caused by the impact force of collision from the insulating member 40 on the fixing portion 30b is further reduced. In another example, a portion of the fixing portion 30b is disposed corresponding to the cavity 99. When the relative movement occurs between the secondary battery 30 and the insulator 40, the portion of the fixing portion 30b corresponding to the cavity 99 is less likely to contact the insulator 40, so that the possibility of contact collision between the portion of the fixing portion 30b corresponding to the cavity 99 and the insulator 40 can be reduced, and the area of contact collision between the fixing portion 30b and the insulator 40 can be reduced, whereby the possibility of cracking of the fixing portion 30b due to the impact force of collision from the insulator 40 on the whole fixing portion 30b can also be reduced.

In one example, the secondary battery 30 is a cylindrical battery. The maximum diameter of the top cover 32 is the same as the diameter of the opening of the housing 31 or the maximum diameter of the top cover 32 is smaller than the diameter of the opening of the housing 31. The top cover 32 may be inserted into the housing 31 through the opening. In one example, the two may be connected by welding. The fixing portion 30b is a weld formed by welding the top cover 32 and the housing 31. The weld is located on the end face of the secondary battery 30 and has a ring shape.

In one example, referring to fig. 2 and 5, the insulating member 40 further includes a receiving portion 41. The end 30a of the secondary battery 30 is inserted into the receiving part 41 to be restrained by the insulating member 40. The accommodating portion 41 has a side wall 411 and a bottom wall 412. The bottom wall 412 is provided in correspondence with the end surface of the housing 31 in the axial direction X. The side wall 411 is disposed around the end 30a of the secondary battery 30 so that the side wall 411 can separate adjacent two end 30 a. The recess 100 is provided in the bottom wall 412 of the housing portion 41. The insulating member 40 has a lead-out hole for leading out the electrode terminal 34. The electrode terminals 34 of the secondary batteries 30 may be passed through the lead-out holes and electrically connected to the bus bar member. A recess 100 is provided around the exit aperture. It will be appreciated that a portion of the recess 100 may also extend to the side wall 411.

The outer surface of the top cover 32 is flush with the end face of the housing 31, and the edge of the top cover 32 is welded to the end face of the housing 31 to form a weld. The weld protrudes beyond the outer surface of the cap 32 toward the raised surface of the insulator 40. The insulator 40 is provided with a recess 100. The recess 100 is annular and is disposed in correspondence with the weld. The recess 100 forms the cavity 99 of the above-described embodiment. The portion of the insulating member 40 surrounded by the recess 100 may abut against the outer surface of the top cap 32, thereby limiting the position of the secondary battery 30 in the axial direction X of the secondary battery 30 and reducing the play of the secondary battery 30 in the axial direction X. The opening size of the recess 100 is larger than the size of the weld in the radial direction of the secondary battery 30, so that the entire weld is disposed corresponding to the recess 100. The radial direction of the secondary battery 30 is perpendicular to the axial direction X. In the event of a drop or impact vibration of the battery module 10, there may be a relative movement between the secondary battery 30 and the insulator 40 in the axial direction X of the secondary battery 30. Since the insulating member 40 is provided with the recess 100 for avoiding the weld, the weld of the secondary battery 30 is less likely to come into contact with the insulating member 40, and the weld itself is less likely to receive an impact force in the axial direction X, thereby reducing the possibility of cracking of the weld.

It will be appreciated that a portion of the weld is positioned in correspondence with the recess 100 and another portion is positioned outside the recess 100. In the case where there is relative movement between the secondary battery 30 and the insulator 40 in the axial direction X of the secondary battery 30, only the portion of the weld located outside the recess 100 comes into contact with the insulator 40 and receives an impact force in the axial direction X, and therefore, since the weld is not entirely subjected to the impact force, the possibility of cracking of the weld can be reduced.

In other examples, the insulator 40 may be a plate-like structure. The secondary battery 30 is disposed at one side of the insulating member 40. The insulator 40 restricts the position of the secondary battery 30 in the axial direction X, but does not restrict the position of the end 30a of the secondary battery 30 in the radial direction of the secondary battery 30. The recess 100 is provided on the surface of the insulator 40 facing the secondary battery 30.

In one embodiment, referring to fig. 2 and 6, a recess 100 is provided on an end 30a of the secondary battery 30. The recess 100 is provided on an end face of the end portion 30a and corresponds to the weld. The recess 100 forms the cavity 99 of the above-described embodiment. A part of the insulating member 40 may abut against a surface of the top cover 32 inside the weld, thereby limiting the secondary battery 30 in the axial direction X of the secondary battery 30 and reducing the occurrence of play of the secondary battery 30 in the axial direction X. In the event of a drop or impact vibration of the battery module 10, there may be a relative movement between the secondary battery 30 and the insulator 40 in the axial direction X of the secondary battery 30. Since the end portion 30a of the secondary battery 30 is provided with the recess 100 for avoiding the bead, the bead of the secondary battery 30 is less likely to contact and collide with the insulating member 40, and the bead itself is less likely to receive an impact force in the axial direction X, thereby reducing the possibility of cracking of the bead.

Optionally, the outer surface of the top cover 32 is lower than the opening edge of the housing 31 so that the top cover 32 is located inside the housing 31. The top cover 32 and a portion of the housing 31 together form the recess 100, and the edge of the top cover 32 is welded to the inner wall of the housing 31 to form a weld.

In another embodiment, referring to fig. 7, the secondary battery 30 is a cylindrical battery. The maximum diameter of the top cover 32 is larger than the diameter of the opening of the housing 31, so that a part of the top cover 32 overlaps the end face of the housing 31. In one example, the two may be connected by welding. In the present embodiment, the fixing portion 30b is a weld formed by welding the top cover 32 and the housing 31. The bead is located on the circumferential surface of the end 30a of the secondary battery 30 and has a ring shape.

In one example, referring to fig. 2 and 8, the outer peripheral surface of the top cover 32 is flush with the outer peripheral surface of the housing 31, and the top cover 32 is welded to the housing 31 at the splice area to form a weld. The insulating member 40 further includes a receiving portion 41. The accommodating portion 41 has a bottom wall 412 and a side wall 411. The end 30a of the secondary battery 30 is inserted into the receiving part 41 to be restrained by the insulating member 40. The bottom wall 412 is provided corresponding to the end surface of the case 31 in the axial direction X, and can limit the position of the secondary battery 30 in the axial direction X. The side wall 411 is provided around the end 30a of the secondary battery 30, so that the end 30a of two adjacent secondary batteries 30 can be insulated and isolated, and the end 30a of the secondary battery 30 can be restrained. The insulating member 40 has a lead-out hole for leading out the electrode terminal 34. The electrode terminals 34 of the secondary batteries 30 may be passed through the lead-out holes and electrically connected to the bus bar member.

The insulating member 40 is provided with a recess 100 communicating with the accommodating portion 41. The recess 100 is provided on the side wall 411 of the accommodating portion 41. The recess 100 forms the cavity 99 of the above-described embodiment. The recesses 100 are provided corresponding to the weld in the radial direction of the secondary battery 30. The bottom wall 412 of the accommodating portion 41 abuts against the outer surface of the top cover 32, so that the secondary battery 30 is limited in the axial direction X of the secondary battery 30, and the play of the secondary battery 30 in the axial direction X is reduced. The opening size of the recess 100 is larger than the size of the weld in the axial direction X of the secondary battery 30, so that the entire weld is disposed corresponding to the recess 100. In the event of a drop or impact vibration of the battery module 10, there may be a relative movement between the secondary battery 30 and the insulator 40 in the axial direction X and/or the radial direction of the secondary battery 30. Since the insulating member 40 is provided with the recess 100 for avoiding the weld, the weld of the secondary battery 30 is less likely to come into contact with the insulating member 40, and the weld itself is less likely to be subjected to an impact force in the axial direction X and/or the radial direction, thereby reducing the possibility of cracking of the weld.

It will be appreciated that a portion of the weld is positioned in correspondence with the recess 100 and another portion is positioned outside the recess 100. When there is relative movement between the secondary battery 30 and the insulating member 40 in the axial direction X of the secondary battery 30, only the portion of the weld located outside the recess 100 is subjected to the impact force in the axial direction X and/or the radial direction, and the weld is not subjected to the impact force as a whole, so that the possibility of cracking of the weld can be reduced.

In another embodiment, referring to fig. 2 and 9, a recess 100 is provided on an end 30a of the secondary battery 30. The recesses 100 are provided in the circumferential direction of the secondary battery 30 and correspond to the welds. The recess 100 forms the cavity 99 of the above-described embodiment. Optionally, the recess 100 is annular. In the event of a drop or impact vibration of the battery module 10, there may be a relative movement between the secondary battery 30 and the insulator 40 in the axial direction X and/or the radial direction of the secondary battery 30. Since the end portion 30a of the secondary battery 30 is provided with the recess 100 for avoiding the bead, the bead of the secondary battery 30 is less likely to come into contact with the insulating member 40, and the bead itself is less likely to be subjected to an impact force in the axial direction X and/or the radial direction, thereby reducing the possibility of cracking of the bead. Optionally, the recess 100 is formed by rolling the cap 32 and/or the housing 31 in the region corresponding to the weld.

Referring to fig. 9, the outer circumferential surface of the top cap 32 may be flush with the outer circumferential surface of the case 31 in the radial direction of the secondary battery 30, forming a recess 100 at the location of the connection of the two, and alternatively, the region of the outer circumferential surface of the top cap 32 not used for welding with the case 31 may be beyond the outer circumferential surface of the case 31 in the radial direction of the secondary battery 30, so that the portion of the top cap 32 and the case 31 near the top cap 32 forms the recess 100, and the edge of the case 31 and the top cap 32 are welded to form a weld.

In yet another embodiment, referring to fig. 2 and 10, the battery module 10 of the embodiment of the present invention further includes a buffer member 70. At least a portion of the cushioning component 70 is positioned within the cavity 99 and isolates the retainer portion 30b from the insulator 40. The fixing portion 30b and the insulating member 40 can press the buffer member 70 together when the secondary battery 30 and the insulating member 40 move relative to each other. The buffering member 70 is disposed to absorb the impact force, thereby reducing the impact force applied to the fixing portion 30b and reducing the possibility of the fixing portion 30b cracking due to the impact force. Optionally, the cushioning component 70 is a flexible structure. The material of the cushioning member 70 may be foam, rubber, silicone, or the like. Alternatively, the buffer member 70 is formed by applying and curing adhesive glue. Optionally, the cushioning component 70 is of annular configuration. In the assembly process, the buffer member 70 is previously provided at a predetermined position of the end 30a of the secondary battery 30, and then the insulator 40 is assembled with the secondary battery 30.

In one example, the cushioning member 70 covers the fixing portion 30b, so that the entire fixing portion 30b can be shielded. In one example, the fixing portion 30b is a weld formed by welding the top cover 32 and the housing 31. After the buffer member 70 covers the entire welding seam, the buffer member 70 may also prevent metal debris remaining or falling off at the welding seam from scattering to other regions inside the battery module 10, so that the safety of the battery module 10 can be improved.

In one example, the insulating member 40 includes a receiving portion 41 having a bottom wall 412 and a side wall 411, and a recess 100 provided on the bottom wall 412. The recess 100 forms the cavity 99 of the above-described embodiment. The secondary battery 30 has a fixing portion 30b on an end surface thereof. In the radial direction of the secondary battery 30, there is a gap between the end 30a of the secondary battery 30 and the side wall 411 of the housing portion 41. A portion of the cushioning member 70 is received in the recess 100 and another portion is located in the gap. The portion of the cushioning member 70 housed in the recess 100 covers the fixing portion 30 b. The portion of the cushioning member 70 located within the gap can restrict the end 30a of the secondary battery 30 from moving radially.

In still another embodiment, referring to fig. 2 and 11, the insulating member 40 includes a receiving portion 41 having a bottom wall 412 and a side wall 411, and a recess 100 provided on the side wall 411. The fixing portions 30b are provided on the circumferential surface of the secondary battery 30. The portion of the cushioning member 70 housed in the recess 100 covers the fixing portion 30b, so that, on the one hand, the cushioning member 70 can restrict the end portion 30a of the secondary battery 30 from moving radially; on the other hand, the cushioning member 70 can protect the entire fixing portion 30b, and reduce the possibility of cracking of the fixing portion 30b due to impact.

The battery module 10 of the present invention includes a case 20, a secondary battery 30, an upper cover 50, a lower cover 60, and an insulator 40. The junction of the top cover 32 and the case 31 of the secondary battery 30 forms a fixing portion 30 b. The insulating member 40 is provided at the end 30a of the secondary battery 30. The end 30a of the secondary battery 30 and the insulator 40 have a cavity 99 therebetween. At least a portion of the fixing portion 30b is disposed corresponding to the cavity 99. In the event of a drop or impact vibration of the battery module 10, the secondary battery 30 and the insulator 40 move relative to each other. Since the cavity 99 can escape from the fixing portion 30b, when the secondary battery 30 and the insulator 40 move relative to each other, the fixing portion 30b of the secondary battery 30 is less likely to contact and collide with the insulator 40, and the possibility of contact and collision between the portion of the fixing portion 30b corresponding to the cavity 99 and the insulator 40 is reduced, so that the possibility of cracking of the fixing portion 30b due to the impact force of collision from the outside on the fixing portion 30b is reduced, and the safety of use of the battery module 10 is improved.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention, and particularly, various features shown in the various embodiments may be combined in any combination as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery module, comprising:

a secondary battery including a case and a top cover connected to the case and forming a fixing portion at a connection;

the insulating part, the insulating part set up in secondary battery's tip, the tip with have the cavity between the insulating part, at least part the fixed part with the cavity corresponds the setting, the cavity is used for dodging the fixed part.

2. The battery module according to claim 1, wherein the insulating member or the secondary battery includes a recess provided corresponding to the fixing portion, the recess forming the cavity.

3. The battery module according to claim 2, wherein the insulating member further comprises an accommodating portion to which an end of the secondary battery is inserted to be restrained by the insulating member, and the recess is communicated with the accommodating portion.

4. The battery module according to claim 3, wherein the recess is provided in the insulating member, the receiving portion has a bottom wall disposed opposite to an end surface of the end portion, and the recess is located in the bottom wall;

and/or the presence of a gas in the gas,

5. The battery module according to claim 2, wherein the recess is provided in the secondary battery, the recess is provided in an end surface of the secondary battery and/or a circumferential surface of the secondary battery, and the fixing portion is provided corresponding to the recess.

6. The battery module according to claim 3 or 4, further comprising a buffer member, at least a portion of which is located in the cavity and separates the fixing part and the insulating member.

7. The battery module according to claim 6, wherein the buffer member covers the fixing part.

8. The battery module according to claim 6, wherein the receiving portion has a gap with the end portion in a radial direction of the end portion, and a portion of the buffer member is located in the gap to restrict the end portion from moving in the radial direction.

9. The battery module according to any one of claims 1 to 5, wherein the fixing portion is a weld formed by connecting the top cover and the case.

10. An apparatus using a battery module as a power source, comprising the battery module according to any one of claims 1 to 9 for supplying electric power.