Battery cell shell and battery cell
By designing the welded and pressure-relief sections of the steel battery cell casing, the problems of complex battery cell casing structure and poor safety were solved, achieving safe pressure relief under high pressure and high temperature, and reducing production costs.
Patent Information
- Application Number
- CN202422882371.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-11-25
AI Technical Summary
Existing battery cell casings have complex structures and complicated manufacturing processes, resulting in poor safety, especially under high voltage and high temperature conditions where they are prone to explosion.
The battery cell casing is made of steel. A welded section is formed by welding the first and second ends of the side shell. A pressure relief section is set in the welded section to release pressure under preset conditions, thereby preventing overall explosion and simplifying the structure and process.
It improves the safety of the battery cell casing, reduces production costs, effectively prevents explosions under high pressure and high temperature conditions, and simplifies the manufacturing process.
Smart Images
Figure CN223583065U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of electric core shell and electric core. BACKGROUND
[0002] Now battery is mostly packaged using aluminum plastic film as shell, commonly known as soft package battery.Aluminum plastic film is thin and soft, the advantage is shape can be varied, the shortcoming is unable to bear greater internal pressure, poor safety.A small part of electric core uses thin-walled stainless steel as the shell of electric core, but needs to be opened on stainless steel shell to make explosion-proof valve, thus leading to the structure and manufacturing process of electric core shell are complex. UTILITY MODEL CONTENT
[0003] The utility model solves the technical problems to overcome the defects that the structure and manufacturing process of electric core shell in the prior art are complex, and provide a kind of electric core shell and electric core.
[0004] The utility model solves the above technical problems by the following technical solutions:
[0005] A kind of electric core shell, its material is steel, the electric core shell includes side shell, the side shell at least includes first end and second end, at least one of the first end and the second end is bent to another to enclose space and the first end and the second end are welded to form welded portion, at least part of the welded portion forms pressure relief portion, the pressure relief portion is used to open when the internal pressure and / or temperature of the space meets the first preset condition.
[0006] In the scheme, the electric core shell is steel material, can bear higher pressure, high strength, not easy to deform, the first end and the second end of side shell enclose space for accommodating the laminated core or winding body, first end and second end are connected by welding portion, and pressure relief portion is formed on the welding portion, and the pressure relief portion is used to open to release pressure to the space when meeting the first preset condition.The first preset condition is that when the internal pressure of the space of side shell exceeds the preset pressure, the pressure relief portion will be broken, and the space is relieved, to prevent the whole side shell from exploding, thereby forming an openable explosion-proof valve at the pressure relief portion, improving safety;The first preset condition can also be that when the internal temperature of the space of side shell exceeds the preset temperature, the metal at the pressure relief portion will be melted at this time, forming an opening at the pressure relief portion, and relieving the pressure of the space to prevent the whole side shell from exploding due to the temperature rise of the space;The first preset condition can also be that when the internal pressure and temperature of the space of side shell exceed the preset value at the same time, the opening of the pressure relief portion is realized.
[0007] The cell shell utilizes the feature that the weld metal (welding part) is structurally different from other parts of the side shell, and sets the pressure relief part at the position of the weld metal (welding part), so that there is no need to open a hole on the cell shell to install the explosion-proof valve, thus simplifying the structure and manufacturing process of the cell shell and reducing the production cost. For example, when welding the side shell, the strength of the weld is configured to be different in different regions at one time, and the pressure relief part is formed in the region with weak strength, which is convenient to be burst and melted at high temperature, and at the same time, the welding of the side shell is completed, and the manufacturing of the pressure relief part is also completed.
[0008] Preferably, the cell shell further comprises a reinforcing member, and the region of the welding part except the pressure relief part is a reinforcing part, and the reinforcing member covers the reinforcing part and is welded to the side shell.
[0009] In this scheme, the reinforcing member is used for strength reinforcement of the region of the welding part except the pressure relief part, and only allows the pressure relief part of the welding part to be burst to relieve pressure, avoiding the pressure relief at the position of the reinforcing part. If the pressure relief at the position of the reinforcing part, it is easy to cause temperature out of control of the adjacent cells when multiple cells are integrated.
[0010] Preferably, the reinforcing member covers the outside of the reinforcing part.
[0011] In this scheme, the side of the reinforcing part towards the accommodation space is the inside, and the side of the reinforcing part towards the outside is the outside. By covering the reinforcing member on the outside of the reinforcing part, the strength of the welding part except the pressure relief part is reinforced, and at the same time, the reinforcing member does not occupy the accommodation space, and the inner wall surface of the accommodation space is smooth, which does not affect the energy density of the cell shell. Of course, in other alternative schemes, the reinforcing member can also be covered on the inside of the reinforcing part, so that the outer surface of the side shell is smooth.
[0012] Preferably, the outside of the pressure relief part is provided with a weak part, the thickness of the weak part is less than the thickness of the part of the side shell except the weak part, and the strength of the weak part is greater than the strength of the welding part.
[0013] In this scheme, the weak part can play a guiding role. When the accommodation space of the side shell is subjected to internal pressure exceeding the preset pressure, the pressure relief part located on the inside of the weak part is opened, avoiding the safety problem caused by the too large opening interval. At the same time, since the strength of the weak part is greater than the strength of the welding part, the strength of the weak part is greater than the pressure relief part, so when the accommodation space of the side shell is subjected to internal pressure exceeding the preset pressure, the pressure relief part is opened first, and then the weak part is opened, thereby forming a double explosion-proof valve structure of the weak part and the pressure relief part on the cell shell, and improving the safety.
[0014] Preferably, the weak part is in a ring structure.
[0015] And / or, the number of the weak part is multiple, and the multiple weak parts are arranged at intervals along the length direction of the welding part.
[0016] In the scheme, the weak part of the annular structure forms a regular hole structure when opened, facilitating pressure relief.
[0017] The multiple weak parts are arranged at intervals on the side shell to form multiple explosion-proof valves, facilitating pressure relief at multiple positions of the side shell, reducing the pressure relief path, improving the pressure relief speed, and further improving the safety.
[0018] Preferably, the four peripheral edges of the weak part are provided with a notch groove.
[0019] In the scheme, by arranging the notch groove around the weak part, the strength of the weak part is reduced, and the weak part is easily opened. When the weak part is processed and manufactured, the notch groove is arranged on the inner wall of the side shell, which facilitates the processing of the weak part, the process is simple, and the manufacturing cost is reduced.
[0020] Preferably, the weak part is symmetrical about the welding part.
[0021] In the scheme, the above structure is arranged, so that the structure of the weak part is regular, and the hole formed when the weak part is opened is regular, so that the pressure relief position and direction are constant, and the high-temperature material during pressure relief does not damage the surrounding battery cells.
[0022] Preferably, the side shell includes at least two welding parts, and the at least two welding parts are arranged at intervals along the circumferential direction of the side shell.
[0023] In the scheme, the circumferential direction of the side shell is the direction around the side shell. When the side shell is formed by welding multiple stainless steel plates to enclose a containing space, multiple welding parts will be formed on the side shell, and correspondingly, multiple pressure relief parts can be formed in the circumferential direction of the side shell. The multiple pressure relief parts quickly relieve pressure towards the four peripheries of the side shell, improving safety.
[0024] Preferably, the containing space has two openings at both ends, and the battery shell further includes a top cover and a bottom plate, the top cover and the bottom plate are respectively mounted and sealed to the two openings, and the top cover and the bottom plate are both welded to the side shell.
[0025] Alternatively, the containing space has an opening, and the battery shell further includes a top cover, the top cover is mounted and sealed to the opening, and the top cover is welded to the side shell.
[0026] In the scheme, the top cover and the bottom plate are welded to the openings at both ends of the side shell to form a complete steel shell. The steel shell can withstand a large pressure and is not easy to deform, and has high strength.
[0027] By welding the top cover on the opening of one end of the side shell, a complete steel shell is formed, which can withstand greater pressure, has high strength and is not easy to deform.
[0028] An electric core comprising the electric core shell as described above.
[0029] On the basis of common knowledge in the art, the above-mentioned preferred conditions can be combined arbitrarily, i.e., the preferred embodiments of the present application.
[0030] The positive progress effect of the electric core shell lies in that the electric core shell is made of steel material, can withstand higher pressure, has high strength and is not easy to deform, the accommodating space for accommodating the lamination stack or the winding body is enclosed by the first end and the second end of the side shell, the first end and the second end are connected through the welding portion, and the pressure relief portion is formed on the welding portion, which is used to open the pressure relief of the accommodating space when the first preset condition is met. The first preset condition is that when the internal air pressure of the accommodating space of the side shell exceeds the preset pressure, the pressure relief portion will be burst open to relieve the pressure of the accommodating space and prevent the whole side shell from exploding, so that the openable explosion-proof valve is formed at the pressure relief portion, improving the safety; the first preset condition can also be that when the internal temperature of the accommodating space of the side shell exceeds the preset temperature, the metal at the pressure relief portion will be melted at this time to form an opening at the pressure relief portion to relieve the pressure of the accommodating space and prevent the whole side shell from exploding due to the temperature rise of the accommodating space; the first preset condition can also be that when the internal air pressure and temperature of the accommodating space of the side shell both exceed the preset value, the opening of the pressure relief portion is realized.
[0031] The electric core shell utilizes the characteristic that the welding seam metal (welding portion) is different from other parts of the side shell, so that the pressure relief portion is arranged at the position of the welding seam metal (welding portion), and it is not necessary to open a hole on the electric core shell to install the explosion-proof valve, thereby simplifying the structure and manufacturing process of the electric core shell and reducing the production cost. For example, when the welding seam of the side shell is welded, the strength of the welding seam is configured to be different in different regions at one time, and the pressure relief portion is formed in the region with weak strength, which is convenient to be burst open and melted at high temperature, and at the same time, the welding of the side shell and the manufacturing of the pressure relief portion are both completed. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 Structure diagram of the electric core shell of the embodiment 1 of the present application Figure 1 .
[0033] Figure 2 Structure diagram of the electric core shell of the embodiment 1 of the present application Figure 2 .
[0034] Figure 3 Structure diagram of the electric core shell of the embodiment 1 of the present application Figure 3 .
[0035] Figure 4 Structure diagram of the electric core shell of the embodiment 2 of the utility model Figure 1 .
[0036] Figure 2 Structure diagram of the electric core shell of the embodiment 2 of the utility model Figures 1-5 .
[0037] Mark explanation:
[0038] Side shell 1
[0039] Welding portion 11
[0040] Pressure relief portion 111
[0041] Reinforcing portion 112
[0042] Weak portion 113
[0043] Notch groove 114
[0044] Reinforcing member 2
[0045] Top cover 3
[0046] Bottom plate 4 Specific implementation
[0047] The utility model will be more clearly and completely explained by the way of embodiment and combining with the drawings, but will not therefore limit the utility model in the embodiment range.
[0048] Embodiment 1
[0049] As Figures 1-5 shown, the embodiment discloses an electric core shell, the material quality of the electric core shell is steel, the electric core shell includes side shell 1, side shell 1 includes at least first end and second end, at least one of first end and second end is bent to the other to enclose the accommodating space and first end and second end are welded to form welding portion 11, at least part of welding portion 11 forms pressure relief portion 111, and pressure relief portion 111 is used to open when the internal pressure and / or temperature of the accommodating space satisfy first preset condition.
[0050] As Figure 1As shown, in the present embodiment, the battery cell shell is made of steel material, which can withstand high pressure, has high strength and is not easy to deform. The first end and the second end of the side shell 1 surround a receiving space for accommodating the laminated body or the wound body. The first end and the second end are connected by a welding portion 11, and a pressure relief portion 111 is formed on the welding portion 11. The pressure relief portion 111 is used to open the pressure relief of the receiving space when the first preset condition is met. The first preset condition is that when the internal pressure of the receiving space of the side shell 1 exceeds the preset pressure, the pressure relief portion 111 will be burst open to relieve the pressure of the receiving space, preventing the entire side shell 1 from exploding. Thus, an openable explosion-proof valve is formed at the pressure relief portion 111, improving safety. The first preset condition can also be that when the internal temperature of the receiving space of the side shell 1 exceeds the preset temperature (for example, 500℃), the metal at the pressure relief portion 111 will be melted at this time, forming an opening at the pressure relief portion 111 to relieve the pressure of the receiving space, preventing the entire side shell 1 from exploding due to the temperature rise of the receiving space. The first preset condition can also be that when the internal pressure and temperature of the receiving space of the side shell 1 both exceed the preset value at the same time, the pressure relief portion 111 is opened by being burst and melted, realizing a double insurance structure of the explosion-proof valve.
[0051] The battery cell shell utilizes the characteristic that the welding metal (welding portion 11) is different from other parts of the side shell in structure, so that the pressure relief portion is arranged at the position of the welding metal (welding portion 11). Therefore, it is not necessary to open a hole on the battery cell shell to install the explosion-proof valve, simplifying the structure and manufacturing process of the battery cell shell and reducing the production cost. For example, when welding the side shell 1, the strength of the welding seam is configured to be different in different regions at one time, and the pressure relief portion 111 is formed in the region with weak strength, which is convenient to be burst and melted at high temperature. At the same time, the welding of the side shell 1 is completed, and the manufacturing of the pressure relief portion 111 is also completed.
[0052] As shown in Figure 2 and Figure 1 , a weak portion 113 is arranged outside the pressure relief portion 111. The thickness of the weak portion 113 is smaller than that of the part of the side shell 1 except the weak portion 113, and the strength of the weak portion 113 is greater than that of the welding portion 11. Thus, the weak portion can play a guiding role. When the internal pressure of the receiving space of the side shell 1 exceeds the preset pressure, the pressure relief portion inside the weak portion is guided to open, avoiding safety problems caused by too large opening interval. At the same time, since the strength of the weak portion 113 is greater than that of the welding portion 11, the strength of the weak portion 113 is greater than that of the pressure relief portion 111. Therefore, when the internal pressure of the receiving space of the side shell 1 exceeds the preset pressure, the pressure relief portion 111 is opened first, and then the weak portion 113 is opened. Thus, a double explosion-proof valve structure of the weak portion 113 and the pressure relief portion 111 is formed on the battery cell shell, improving safety.
[0053] As shown in Figure 2 and Figure 1As shown, the weakened portion 113 is in a ring structure, and the ring structure of the weakened portion 113 forms a regular hole structure when opened, facilitating pressure relief.
[0054] Preferably, the number of weakened portions 113 is multiple, and the multiple weakened portions 113 are arranged at intervals along the length direction of the welding portion 11. The multiple weakened portions 113 are arranged at intervals on the side shell 1, forming multiple explosion-proof valves, facilitating pressure relief at multiple positions of the side shell 1, improving the pressure relief speed, and further improving the safety.
[0055] As shown in FIG. 1, Figure 2 and Figures 1-3 As shown, the four peripheral edges of the weakened portion 113 are provided with score grooves 114. By providing the score grooves 114 around the weakened portion 113, the strength of the weakened portion 113 is reduced, facilitating the opening of the weakened portion 113. When the weakened portion 113 is processed and manufactured, the score grooves 114 are provided on the inner wall of the side shell 1, facilitating the processing of the weakened portion 113, the process is simple, and the manufacturing cost is reduced.
[0056] In this embodiment, the weakened portion 113 is symmetrical about the welding portion 11, so that the structure of the weakened portion 113 is regular, and the hole formed when the weakened portion 113 is opened is regular, so that the pressure relief position and direction are constant, and the high-temperature material during pressure relief does not damage the surrounding battery cells.
[0057] In another embodiment, the side shell includes at least two welding portions arranged at intervals in the circumferential direction of the side shell. The circumferential direction of the side shell is the direction around the side shell. When the side shell is formed by welding a plurality of stainless steel plates and surrounding a containing space, a plurality of welding portions will be formed on the side shell, and correspondingly, a plurality of pressure relief portions can be formed in the circumferential direction of the side shell, and the plurality of pressure relief portions can quickly relieve pressure towards the periphery of the side shell, improving safety.
[0058] As shown in FIG. 1, Figure 4 As shown, the two ends of the containing space have openings, and the battery cell shell further includes a top cover 3 and a bottom plate 4, the top cover 3 and the bottom plate 4 are respectively mounted and sealed on the two openings, and the top cover 3 and the bottom plate 4 are welded with the side shell 1. By welding the top cover 3 and the bottom plate 4 on the openings at both ends of the side shell 1, a complete steel shell is formed, which can withstand a large pressure and is not easy to deform, and has high strength.
[0059] In another embodiment, the containing space surrounded by the side shell has an opening, and the battery cell shell further includes a top cover, the top cover is mounted and sealed on the opening, and the top cover is welded with the side shell. By welding the top cover on the opening at one end of the side 1, a complete steel shell is formed, which can withstand a large pressure, has high strength, and is not easy to deform.
[0060] The present embodiment also discloses a battery cell including the battery cell shell as described above.
[0061] Embodiment 2
[0062] As shown in Figure 5 and Figure 4 , the embodiment is basically the same as Embodiment 1, and the difference is that the cell shell further comprises a reinforcing member 2, the area of the welding portion 11 except the pressure relief portion 111 is a reinforcing portion 112, the reinforcing member 2 covers the reinforcing portion 112 and is welded to the side shell 1. The reinforcing member 2 is used for strength reinforcement of the area of the welding portion 11 except the pressure relief portion 111, only allows pressure relief at the pressure relief portion 111 of the welding portion 11, and avoids pressure relief at the position of the reinforcing portion 112. If the pressure relief is at the position of the reinforcing portion 112, it is easy to cause temperature runaway of adjacent cells when multiple cells are integrated.
[0063] As shown in Figure 5 and , the reinforcing member 2 covers the outside of the reinforcing portion 112. The side of the reinforcing portion 112 facing the accommodation space is the inside, and the side of the reinforcing portion 112 facing the outside is the outside. By covering the reinforcing member 2 on the outside of the reinforcing portion 112, the strength of the welding portion 11 except the pressure relief portion 111 is reinforced, and at the same time, the reinforcing member 2 does not occupy the accommodation space, and the inner wall surface of the accommodation space is flat, which does not affect the energy density of the cell shell. Of course, in other alternative schemes, the reinforcing member can also be covered on the inside of the reinforcing portion, so that the outer surface of the side shell is flat.
[0064] In the description herein, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0065] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, and the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, and these changes and modifications all fall within the protection scope of the present application.
Claims
1. An electric cell housing made of steel, characterized in that, The battery cell housing comprises a side shell, the side shell comprises at least a first end and a second end, at least one of the first end and the second end is bent to the other to enclose a containing space, and the first end and the second end are welded to form a welding portion, at least part of the welding portion forms a pressure relief portion, the pressure relief portion is used to open when the pressure and / or temperature inside the containing space meets a first preset condition.
2. The cell housing of claim 1, wherein, The battery cell housing further comprises a reinforcing member, a region of the welding portion other than the pressure relief portion is a reinforcing portion, and the reinforcing member covers the reinforcing portion and is welded to the side shell.
3. The cell housing of claim 2, wherein, The reinforcing member covers the outside of the reinforcing portion.
4. The cell housing of claim 1, wherein, The outside of the pressure relief portion is provided with a weak portion, the thickness of the weak portion is less than the thickness of the part of the side shell other than the weak portion, and the strength of the weak portion is greater than the strength of the welding portion.
5. The cell housing of claim 4, wherein, The weak portion has a ring structure. And / or, the number of the weak portions is multiple, and the multiple weak portions are arranged at intervals along the length direction of the welding portion.
6. The cell housing of claim 4, wherein, The four peripheral edges of the weak portion are provided with a notch groove.
7. The cell housing of claim 4, wherein, The weak portion is symmetrical with the welding portion as the axis of symmetry.
8. The cell housing of claim 1, wherein, The side shell comprises at least two welding portions, and the at least two welding portions are arranged at intervals along the circumferential direction of the side shell.
9. The cell housing of claim 1, wherein, Both ends of the containing space have openings, the battery cell housing further comprises a top cover and a bottom plate, the top cover and the bottom plate are respectively installed and sealed to the two openings, and the top cover and the bottom plate are both welded to the side shell. Alternatively, the containing space has an opening, the battery cell housing further comprises a top cover, the top cover is installed and sealed to the opening, and the top cover is welded to the side shell.
10. An electric cell characterized by The battery cell comprises the battery cell housing according to any one of claims 1-9.