Battery cell shell, battery cell monomer and battery pack
By setting an exhaust channel on the protective patch of the explosion-proof valve and controlling the distance between the injection hole and the protective patch, combined with the design of the flow-blocking component, the problem of electrolyte contamination of the explosion-proof valve is solved, and the stability and safety protection of the explosion-proof valve are achieved.
Patent Information
- Application Number
- CN202520058214.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-01-10
AI Technical Summary
In existing battery casings, when the containment chamber of the explosion-proof valve is connected to the outside, electrolyte can easily enter the chamber and contaminate the explosion-proof valve, affecting its stability and safety.
An exhaust channel is set on the protective patch of the explosion-proof valve, and the shortest distance between the injection hole and the edge of the protective patch is greater than 2mm. Combined with the flow-blocking component design, the injection hole and the exhaust channel are prevented from being too close to each other, thus preventing electrolyte from entering the explosion-proof valve.
It effectively protects the explosion-proof valve, avoids electrolyte contamination, ensures the stability and safety of the explosion-proof valve, and reduces the risk of electrolyte entering the explosion-proof valve.
Smart Images
Figure CN223757576U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of battery structure, especially to a battery cell shell, a battery cell monomer and a battery pack. BACKGROUND
[0002] The explosion-proof valve and the cover plate are common components of the battery cell shell, and the explosion-proof valve installed on the cover plate is a common technical means for solving the problem of excessive internal pressure of the battery.
[0003] In a common battery cell shell, a protective patch is arranged on the explosion-proof valve to prevent sharp objects from damaging the explosion-proof valve or foreign matter, dust, etc. from falling into the explosion-proof valve to affect the safety of the power battery. The protective patch and the explosion-proof valve form an accommodation chamber, but during the use of the battery, the temperature and volume in the accommodation chamber will change, causing the pressure in the accommodation chamber to change and affecting the stability of the explosion-proof valve burst value.
[0004] Therefore, in the related art, a through hole is formed in the protective patch to communicate the gas in the accommodation chamber with the outside atmosphere, so as to avoid the change of the pressure in the accommodation chamber and ensure the stability of the explosion-proof valve burst value. However, the through hole provides a path for the electrolyte to enter the accommodation chamber, and the electrolyte entering the accommodation chamber will contaminate the explosion-proof valve.
[0005] Therefore, there is an urgent need for a battery cell shell to solve the above technical problems. SUMMARY
[0006] The utility model discloses a battery cell shell, a battery cell monomer and a battery pack, which can prevent electrolyte from entering the explosion-proof valve and contaminating the explosion-proof valve, and protect the explosion-proof valve.
[0007] To achieve this purpose, the utility model adopts the following technical scheme:
[0008] In a first aspect, a battery cell shell is provided, comprising:
[0009] a shell body having an opening;
[0010] a cover plate covering the opening, the cover plate having a liquid injection hole;
[0011] an explosion-proof structure installed on the cover plate, the explosion-proof structure comprising an explosion-proof valve and a protective patch arranged above the explosion-proof valve, the protective patch and the explosion-proof valve forming a chamber, the protective patch having at least one exhaust passage communicating with the chamber, the shortest distance between the liquid injection hole and the edge of the protective patch being d1, the distance between the liquid injection hole and the exhaust passage being d2, wherein (d2-d1) is greater than or equal to 2mm.
[0012] In a second aspect, an electric cell monomer is provided, comprising an electric cell and the electric cell shell according to any one of the preceding aspects, wherein the electric cell is arranged in the electric cell shell.
[0013] In a third aspect, a battery pack is provided, comprising a battery pack shell and the electric cell monomer according to the preceding aspect, wherein the electric cell monomer is arranged in the battery pack shell.
[0014] The electric cell shell, the electric cell monomer and the battery pack provided by the utility model have at least the following beneficial effects:
[0015] The electric cell shell, the electric cell monomer and the battery pack provided by the utility model have at least the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings without creative labor.
[0017] Figure 1 The structural schematic diagram of the electric cell shell provided by the embodiments of the utility model is shown in the figure.
[0018] Figure 2 The top view of the electric cell shell provided by the embodiments of the utility model is shown in the figure.
[0019] Figure 3 The structural schematic diagram of the protection patch provided by the embodiments of the utility model is shown in the figure.
[0020] Figure 4 The structural schematic diagram of the protection patch provided by the embodiments of the utility model is shown in the figure. Figure 3 The local enlarged view of A in the figure.
[0021] In the figure:
[0022] 1, shell main body; 2, cover plate; 21, liquid injection hole; 22, pole; 23, first side wall; 24, second side wall; 3, protection patch; 31, exhaust passage; 4, flow resistance piece. DETAILED DESCRIPTION
[0023] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are merely intended to explain the utility model and not to limit the utility model. In addition, it should be noted that only the parts related to the utility model are shown in the drawings for ease of description, not all the structures.
[0024] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0025] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.
[0026] In the description of the embodiment, the terms "up", "down", "right", etc. orientation or position relationship is based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description and have no special meaning.
[0027] In the prior art, in order to avoid the change of air pressure in the accommodating chamber to ensure the stability of the explosion valve burst value, a through hole is arranged on the protection patch to communicate the accommodating chamber with the outside, and the electrolyte remaining on the cover plate can enter the accommodating chamber through the through hole. Therefore, the utility model embodiment provides a battery cell shell, a battery cell and a battery pack, which can prevent the electrolyte from entering the explosion valve and polluting the explosion valve, and protect the explosion valve.
[0028] As Figures 1-4As shown, the battery cell shell comprises a shell main body 1, a cover plate 2 and an explosion-proof structure, wherein the shell main body 1 has an opening, the shell main body 1 is formed with a mounting cavity, so that the battery cell can be mounted in the mounting cavity; the cover plate 2 is arranged at the opening to seal the mounting cavity, the cover plate 2 has a liquid injection hole 21; the explosion-proof structure is mounted on the cover plate 2, the explosion-proof structure comprises an explosion-proof valve and a protective patch 3 arranged above the explosion-proof valve, a cavity is formed between the protective patch 3 and the explosion-proof valve, the protective patch 3 has at least one exhaust passage 31 communicating with the cavity, the shortest distance between the liquid injection hole 21 and the edge of the protective patch 3 is d1, and the distance between the liquid injection hole 21 and the exhaust passage 31 is d2, wherein (d2-d1)≥2mm.
[0029] The difference between the distance d1 between the liquid injection hole 21 and the exhaust passage and the shortest distance d2 between the liquid injection hole 21 and the edge of the protective patch 3 is greater than or equal to 2mm, so that the distance between the exhaust passage 31 and the liquid injection hole 21 can be adjusted based on the distance between the explosion-proof valve and the liquid injection hole 21, so as to avoid the liquid injection hole 21 being too close to the exhaust passage 31 to pollute the explosion-proof valve, thereby protecting the explosion-proof valve.
[0030] Exemplarily, the materials of the shell main body 1 and the cover plate 2 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic and the like.
[0031] The exhaust passage 31 is specifically a notch arranged on the protective patch 3 towards the explosion-proof valve, and of course the exhaust passage 31 can also be a groove formed by bending the protective patch 3 away from the explosion-proof valve.
[0032] Reference Figure 1 and Figure 2 As shown, the cover plate 2 has a first side wall 23 and a second side wall 24, the shape of the cover plate 2 is a rectangular structure, the first side wall 23 and the second side wall 24 are connected to each other, the second side wall 24 is a long side wall of the cover plate 2, and the first side wall 23 is a short side wall of the cover plate 2.
[0033] In some embodiments, the minimum distance between the exhaust passage 31 and the liquid injection hole 21 is d2, d2 can be the straight-line distance between the exhaust passage 31 and the liquid injection hole 21, and 2mm≤d2≤150mm. For example, the value of d2 can be 2mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm or 150mm, which is not limited in the embodiment. By limiting the value range of d2, the distance between the liquid injection hole 21 and the exhaust passage 31 can be prevented from being too close, so as to prevent the electrolyte from entering the explosion-proof valve through the exhaust passage 31 to pollute the explosion-proof valve.
[0034] The shortest distance between the liquid injection hole 21 and the edge of the protective patch 3 is d1, and 5mm≤d1≤40mm. For example, d1 can be 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm or 40mm, which is not limited in the embodiment. By limiting the value range of d1, the distance between the liquid injection hole 21 and the protective patch 3 can be prevented from being too close, so as to avoid the electrolyte being close to the protective patch 3 and polluting the explosion-proof valve.
[0035] In some embodiments, the second side wall 24 of the cover plate 2 is the side wall closest to the explosion-proof valve. The minimum distance between the second side wall 24 of the cover plate 2 and the side wall of the explosion-proof valve is L. The minimum distance between the exhaust channel 31 and the second side wall 24 of the cover plate 2 is C, wherein C≤1.2L. By setting in this way, the exhaust channel 31 can fall on the side wall (or the adjacent circular arc wall) of the explosion-proof valve, so that the exhaust channel 31 is adjacent to and close to the second side wall 24 of the cover plate 2. When the electrolyte is splashed, the electrolyte is more likely to flow out from the end face of the battery cell shell, reducing the path of the electrolyte flowing out, and thereby reducing the risk of the electrolyte entering the explosion-proof valve.
[0036] The exhaust channel 31 can prevent the internal cavity of the protective patch 3 from deforming due to temperature suction and bulging. For this purpose, in some embodiments, as shown in FIGS. 1, 2 and 3, the exhaust channel 31 is arranged on the second side wall 24 of the cover plate 2, and the exhaust channel 31 is arranged on the second side wall 24 of the cover plate 2. Figure 3 and Figure 4 As shown in FIGS. 1, 2 and 3, the width of the exhaust channel 31 is b, and 1mm≤b≤15mm. For example, b can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm or 15mm, which is not limited in the embodiment. If b is too small, the effect of the exhaust channel 31 cannot be achieved. If b is too large, the electrolyte is more likely to enter the explosion-proof valve. In this way, the exhaust effect can be guaranteed while reducing the probability of the electrolyte entering the explosion-proof valve.
[0037] In some embodiments, a flow resistance member 4 for stopping the electrolyte is arranged on the cover plate 2. The flow resistance member 4 is arranged on the outer periphery of the explosion-proof structure to prevent the electrolyte from entering the exhaust channel 31. Since the flow direction of the splashed electrolyte is not fixed, it will flow in all directions. When the electrolyte flows towards the explosion-proof structure, the electrolyte will be blocked by the flow resistance member 4 and cannot flow directly to the explosion-proof structure beyond the flow resistance member 4, thereby avoiding the exhaust channel 31 entering the electrolyte.
[0038] For example, the flow resistance member 4 is a groove. In this way, when the electrolyte flows towards the explosion-proof structure, part of the electrolyte will flow into the groove first, which can reduce the amount of electrolyte flowing towards the explosion-proof structure while blocking the electrolyte. The other part of the electrolyte will flow out of the cover plate 2. In this way, the groove is used to accommodate the splashed electrolyte, avoiding the electrolyte entering the explosion-proof structure, and playing a protective role for the explosion-proof valve.
[0039] Of course, in other embodiments, the flow-blocking element 4 can also be a protrusion or a rib, so that the flow-blocking element 4 can block the electrolyte from flowing to the explosion-proof structure, prevent the electrolyte from entering the explosion-proof structure, and play a role in protecting the explosion-proof valve.
[0040] Since the current-blocking element 4 protrudes from the cover plate 2, the height of the protrusion or rib is lower than the height of the pole post 22 located outside the cell housing, thus avoiding interference between the current-blocking element 4 and other structures located outside the cell housing.
[0041] Furthermore, combined Figure 1 and Figure 2 As shown, the flow-blocking element 4 is positioned facing the exhaust channel 31, meaning the flow-blocking element 4 and the exhaust channel 31 are directly opposite each other. This prevents the electrolyte from directly entering the exhaust channel 31 and contaminating the explosion-proof valve. The flow-blocking element 4 and the exhaust channel 31 are in one-to-one correspondence; that is, the number of flow-blocking elements 4 is the same as the number of exhaust channels 31, with one flow-blocking element 4 corresponding to one exhaust channel 31. This arrangement ensures that each exhaust channel 31 is protected by the groove, and also reduces the difficulty and cost of processing the flow-blocking element 4. Furthermore, the above arrangement ensures that the flow-blocking element 4 can better protect the exhaust channel 31, and can contain the electrolyte when it spills out.
[0042] Specifically, the minimum distance between the flow-blocking component 4 and the exhaust channel 31 is E, where 0.5mm ≤ E ≤ 20mm. For example, the value of E can be 0.5mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm. In this embodiment, the value of E is not specifically limited. If E is too large, the exhaust channel 31 cannot be better protected; if E is too small, when the flow-blocking component 4 is a groove, the electrolyte in the groove may overflow and enter the explosion-proof valve, posing a high risk of contamination.
[0043] In some embodiments, the explosion-proof valve has a rectangular structure, and the extending direction of the flow-blocking element 4 is parallel to the length extending direction of the second sidewall 24 of the cover plate 2. Thus, the flow-blocking element 4 can be made longer, increasing the area for blocking the electrolyte. Especially when the flow-blocking element 4 is a groove, the groove can hold more electrolyte, thereby increasing the capacity of the groove to hold electrolyte.
[0044] In some other embodiments, the flow blocking member 4 is arranged around the outer periphery of the explosion-proof valve, that is, the flow blocking member 4 has the same shape as the outer periphery of the explosion-proof valve. In addition, the shape of the explosion-proof valve is not limited, and can be a circular structure, a triangular structure or a rectangular structure, so that the flow blocking member 4 can avoid the electrolyte spilt from everywhere of the explosion-proof valve from approaching the explosion-proof valve, so as to prevent the electrolyte from flowing along the side of the explosion-proof valve to the exhaust passage 31, further avoid the electrolyte from entering the exhaust passage 31, thereby protecting the explosion-proof valve. Especially when the flow blocking member 4 is a groove, the capacity of the groove for containing the electrolyte is further improved.
[0045] In some embodiments, the cover plate 2 has oppositely arranged first and second surfaces, the first surface is provided with a groove recessed towards the second surface, so that the second surface is formed with a protrusion protruding, and the flow blocking member 4 is the groove recessed on the first surface. That is, the formation of the groove and the protrusion can be obtained by stamping the cover plate 2, after stamping, the first surface forms the groove, and the second surface forms the protrusion. Compared with the setting of the groove by thinning on the cover plate 2, this setting can improve the strength of the cover plate 2 and avoid the local strength of the cover plate 2 from being reduced. Among the first and second surfaces, one surface is the outer surface of the cover plate 2 away from the shell body 1, and the other surface is the inner surface of the cover plate 2 towards the shell body 1.
[0046] In some embodiments, the top center of the protective patch is without an opening. In this way, foreign matter or liquid can be prevented from entering the chamber through the opening.
[0047] The utility model also provides a kind of battery monomer, including battery and the battery shell provided by the utility model embodiment of the utility model, battery is set in battery shell. Battery monomer uses the battery shell provided by the utility model embodiment, and the battery shell includes cover plate 2, cover plate 2 is provided with explosion-proof structure, explosion-proof structure has exhaust passage 31 communicated with chamber, since the projection of exhaust passage 31 and liquid injection hole 21 on the same side wall of cover plate 2 is not overlapped, so it can prevent the distance between liquid injection hole 21 and exhaust passage 31 from being too close, avoid electrolyte from exhaust passage 31 into explosion-proof valve and pollute explosion-proof valve, play the role of protecting explosion-proof valve.
[0048] Since the battery shell is included, the battery monomer of the utility model embodiment has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.
[0049] The battery monomer is substantially cuboid, and has length, width and height. The length of the battery monomer is greater than the width of the battery monomer, and the height of the battery monomer is greater than the width of the battery monomer. Y direction is the width direction of the battery monomer, Z direction is the height direction of the battery monomer, and X direction is the length direction of the battery monomer.
[0050] The utility model also provides a kind of battery pack, including battery pack shell and the utility model embodiment provided by cell monomer, cell monomer is arranged in battery pack shell inside. Cell monomer uses the utility model embodiment provided by cell shell, and cell shell includes cover plate 2, cover plate 2 is provided with explosion-proof structure, and explosion-proof structure has the exhaust passage 31 communicated with chamber, since the projection of exhaust passage 31 and liquid injection hole 21 in the same side wall of cover plate 2 does not overlap, so as to prevent the distance of liquid injection hole 21 and exhaust passage 31 from being too close, avoid electrolyte from exhaust passage 31 into explosion-proof valve and pollute explosion-proof valve, play the role of protecting explosion-proof valve.
[0051] The number of cell monomers can be multiple, and the multiple cell monomers can be connected in series, parallel or mixed connection to form a whole, and then the whole formed by the multiple cell monomers is directly accommodated in the mounting cavity of the shell main body 1. In other embodiments, the multiple cell monomers can also be connected in series, parallel or mixed connection and arranged and fixed to form a battery module, and the battery module is accommodated in the mounting cavity of the shell main body 1. In still other embodiments, the multiple cell monomers can also be connected in series, parallel or mixed connection and arranged and fixed to form multiple battery modules, and the multiple battery modules are connected in series, parallel or mixed connection to form a whole and are accommodated in the mounting cavity of the shell main body 1.
[0052] As an example, the multiple cell monomers can be fixed to form a battery module by a tie or the like.
[0053] In other embodiments, the number of cell monomers can also be one.
[0054] The cell monomer referred to in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. The cell monomer can be a secondary battery or a primary battery. The cell monomer can be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery. The cell monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes.
[0055] Due to the cell monomer described above, the battery pack of the embodiments of the utility model has all the advantages and beneficial effects of the above embodiments, which will not be repeated here.
[0056] In addition, the above are only preferred embodiments of the utility model and the technical principles applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments described herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model has been described in more detail through the above embodiments, the utility model is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the utility model, and the scope of the utility model is determined by the appended claims.
Claims
1. An electric cell housing, characterized by, The application relates to a shell body (1) with an opening; a cover plate (2) covering the opening, the cover plate (2) having a liquid injection hole (21); an explosion-proof structure installed on the cover plate (2), the explosion-proof structure comprising an explosion-proof valve and a protective patch (3) arranged above the explosion-proof valve, a cavity being formed between the protective patch (3) and the explosion-proof valve, the protective patch having at least one exhaust passage (31) communicating with the cavity, the shortest distance between the liquid injection hole (21) and the edge of the protective patch (3) being defined as d1, and the distance between the liquid injection hole (21) and the exhaust passage (31) being defined as d2, wherein (d2-d1) is greater than or equal to 2 mm. 5mm<=d1<=40mm, 2mm<=d2<=150mm. The second side wall (24) of the cover plate (2) is the side wall closest to the explosion-proof valve, the minimum distance between the second side wall (24) of the cover plate (2) and the side wall of the explosion-proof valve being defined as L, and the minimum distance between the exhaust passage (31) and the second side wall (24) of the cover plate (2) being defined as C, wherein C<=1.2L. The width of the exhaust passage (31) is b, wherein 1mm<=b<=15mm.
2. The cell case of claim 1, wherein, The cover plate (2) is provided with a flow resistance piece (4) for stopping electrolyte, and the flow resistance piece (4) is arranged on the outer periphery of the explosion-proof structure.
3. The cell case of claim 1, wherein, The flow resistance piece (4) is a groove.
4. The cell housing of any one of claims 1-3, wherein, The flow resistance piece (4) is a protrusion or a convex rib.
5. The cell housing of any one of claims 1-3, wherein, The flow resistance piece (4) is arranged towards the exhaust passage (31), and the flow resistance piece (4) corresponds to the exhaust passage (31) one by one.
6. The cell housing of claim 5, wherein, The minimum distance between the flow resistance piece (4) and the exhaust passage (31) is E, wherein 0.5mm<=E<=20mm.
7. The cell case of claim 5, wherein, The explosion-proof valve is in a rectangular structure, and the extension direction of the flow resistance piece (4) is arranged in parallel with the extension direction of the length of the second side wall (24) of the cover plate (2).
8. The cell housing of claim 5, wherein, The flow resistance piece (4) is arranged around the outer periphery of the explosion-proof valve.
9. The electrochemical cell housing of claim 5, wherein, The cover plate (2) has oppositely arranged first and second surfaces, the first surface is provided with a groove recessed towards the second surface, the second surface is formed with a protrusion protruding, and the flow resistance piece (4) is the groove recessed on the first surface.
10. The cell case of claim 5, wherein, The top center of the protective patch (3) is not provided with an opening.
11. The electrochemical cell housing of claim 5, wherein, The application further relates to a battery cell comprising a cell core and a cell shell as claimed in any one of claims 1-13, and the cell core is arranged in the cell shell.
12. The cell case of claim 5, wherein, The application further relates to a battery pack shell and a cell monomer as claimed in claim 14, and the cell monomer is arranged in the battery pack shell.
13. The electrochemical cell housing of any one of claims 1-3, wherein, 14. An electrochemical cell, characterized by 15. A battery pack, characterized by