Battery and electric equipment with same
By designing the exhaust space between the pole group and the housing, the problem of unstable gas emissions of stacked batteries when thermally runaway is solved, reducing safety risks and improving battery safety.
Patent Information
- Application Number
- CN202420281708.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-05
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-02-05
AI Technical Summary
When the stacked battery is thermally out of control, high-temperature and high-pressure gases are difficult to discharge stably, which easily impacts the pole group and the shell, increasing the risk of explosion.
By designing the shape of the electrode group, an exhaust space is formed between it and the shell, ensuring that the high-temperature and high-pressure gas can be discharged stably when thermally runaway, and reducing the impact on the electrode group and shell.
It effectively reduces the safety risk of the pole group after thermal runaway, ensures that the gas can be discharged stably, avoids explosions, and improves the safety of the battery.
Smart Images
Figure CN222514929U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic batteries, in particular to a battery and an electrical device having the same. Background Art
[0002] With the development of science, cars have become an indispensable item for every family. With the increase in the number of cars in the world, the exhaust emissions from cars are increasing, seriously polluting people's living environment. Therefore, clean energy is getting more and more attention. As the most widely used clean energy, lithium-ion batteries are becoming more and more important to people for their safety while making it convenient for people to travel.
[0003] The laminated battery has a higher space utilization rate inside the electrode group, which makes it have a higher energy density. However, there is less space inside the battery, leaving less space for gas in the event of thermal runaway. When the electrode group experiences thermal runaway, as the gas sprays out from the explosion-proof valve, it will pull the pole column to move, blocking the explosion-proof valve and easily causing the pole ear to tear. If violent gas production occurs, the battery is more likely to explode. Utility Model Content
[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery with good exhaust effect, which can reduce the safety risk after the thermal runaway of the electrode group.
[0005] A battery according to an embodiment of the utility model includes: a shell and a pole group installed in the shell, the pole group has a side surface which is a first side surface, and a side wall of the shell opposite to the first side surface is a first side wall, and the first side surface gradually inclines in a direction from a first end to a second end in a direction away from the first side wall to construct a first exhaust space between the first side surface and the first side wall.
[0006] According to the battery of the embodiment of the utility model, by designing the shape of the electrode group, a first exhaust space is constructed between the electrode group and the shell, so that when the electrode group is in thermal runaway, high-temperature and high-pressure gas can be discharged more stably, and it is not easy to impact the electrode group or the shell, which can reduce the safety risk after the thermal runaway of the electrode group.
[0007] In addition, the battery according to the utility model may also have the following additional technical features:
[0008] In some embodiments of the present invention, the battery also includes a first explosion-proof valve, the shell has a first end wall at the first end, the shell has a second end wall at the second end, the first explosion-proof valve is installed on the second end wall, and at least a portion of the first explosion-proof valve is opposite to the first exhaust space.
[0009] In some embodiments of the present invention, the battery further comprises a first pole, which is mounted on the second end wall and disposed adjacent to a second side surface opposite to the first side surface of the pole group.
[0010] In some embodiments of the present invention, the side opposite to the first side of the pole group is the second side, and the side wall of the shell opposite to the second side is the second side wall, and in the direction from the second end to the first end, the second side gradually inclines toward a direction away from the second side wall to construct a second exhaust space between the second side and the second side wall.
[0011] In some embodiments of the present invention, the battery further includes a second explosion-proof valve, the shell has a first end wall at the first end, the second explosion-proof valve is installed on the first end wall, and at least a portion of the second explosion-proof valve is opposite to the second exhaust space.
[0012] In some embodiments of the present invention, the battery further includes a second pole, which is mounted on the first end wall and disposed adjacent to the first side surface.
[0013] In some embodiments of the present invention, the pole group includes a plurality of stacked pole pieces, and in a projection plane perpendicular to the thickness direction of the pole pieces, the projection of each pole piece is a parallelogram, or the projection of each pole piece is a rhombus.
[0014] In some embodiments of the utility model, in the projection plane, the pole piece has a first side edge on the first side surface, the pole piece has a first end edge at the first end, the pole piece and the second end have a second end edge, the intersection of the first side edge and the first end edge is a first intersection, the intersection of the first side edge and the second end edge is a second intersection, a straight line passing through the first intersection and perpendicular to the first end edge is a first straight line, the straight line where the second end edge is located is opposite to the second straight line, the intersection of the first straight line and the second straight line is a third intersection, and the distance between the third intersection and the second intersection is D1 satisfying: 1mm≤D1≤6mm.
[0015] In some embodiments of the present invention, within the projection plane, the pole piece has a first side edge at the first side surface, the pole piece has a first end edge at the first end, and an angle a between the first end edge and the first side edge satisfies: 80°≤a1≤85°.
[0016] The utility model also provides an electrical device having the battery of the above embodiment.
[0017] According to the electric equipment of the embodiment of the utility model, by being provided with the battery of the above embodiment, the high-temperature and high-pressure gas can be discharged better when the electrode group has thermal runaway, and it is not easy to have impact on the electrode group or the shell, which can reduce the safety risk after the thermal runaway of the electrode group, thereby better protecting the electric equipment.
[0018] Optionally, the power-consuming device may be a vehicle or other device requiring a battery, which is not limited here.
[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0021] Figure 1 It is a schematic diagram of the structure of a battery according to an embodiment of the utility model.
[0022] Figure 2 It is a schematic diagram of the structure of a pole piece according to an embodiment of the utility model.
[0023] Figure 3 It is a schematic structural diagram of the positive electrode sheet and the negative electrode sheet when they are stacked according to an embodiment of the utility model.
[0024] Reference numerals:
[0025] Battery 100,
[0026] Shell 10, first side wall 101, second side wall 102, first end wall 103, second end wall 104,
[0027] Electrode group 20, first side surface 21, second side surface 22, electrode sheet 201, first side edge 211, second side edge 212, first end edge 213, second end edge 214, positive electrode sheet 2, negative electrode sheet 3,
[0028] The first exhaust space 31, the second exhaust space 32,
[0029] The first explosion-proof valve 41, the second explosion-proof valve 42,
[0030] A first pole 51 and a second pole 52 . DETAILED DESCRIPTION
[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0032] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.
[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0034] Reference below Figure 1-Figure 3 A battery 100 according to an embodiment of the present invention is described.
[0035] like Figure 1-Figure 3 As shown, a battery 100 according to an embodiment of the utility model includes a shell 10 and a pole group 20 installed in the shell 10, the pole group 20 has a side surface as a first side surface 21, and the side wall of the shell 10 opposite to the first side surface 21 is a first side wall 101, and the first side surface 21 gradually inclines in a direction away from the first side wall 101 from the first end to the second end, so as to construct a first exhaust space 31 between the first side surface 21 and the first side wall 101.
[0036] That is to say, when the electrode group 20 is installed in the shell 10, a first exhaust space 31 can be formed between the electrode group 20 and the shell 10. When the electrode group 20 has thermal runaway, a large amount of high-temperature and high-pressure gas is discharged from the electrode group 20. The first exhaust space 31 can buffer the gas, which can prevent a large amount of high-temperature and high-pressure gas from directly impacting the shell 10. In addition, when the gas accumulates enough pressure in the first exhaust space 31, it can better impact the explosion-proof valve, making it easier to open the explosion-proof valve, thereby reducing the safety risk of the electrode group 20 after thermal runaway. Moreover, since the first exhaust space 31 is added to the shell 10, the gas can be stably accumulated in the first exhaust space 31 and then stably discharged in the direction of the explosion-proof valve. Compared with the battery 100 in the prior art in which the first exhaust space 31 is not provided, the high-temperature and high-pressure gas in the shell 10 is prone to pressure fluctuations, which not only easily affects the discharge of the gas, but also easily causes impact and pulling on the electrode group 20, thereby easily causing the pole ear to break, and the pole column and other structures to block the explosion-proof valve, which ultimately affects the discharge of the gas.
[0037] Reference Figure 1 In a specific embodiment shown in the figure, the pole group 20 includes a plurality of stacked pole pieces 201, the pole pieces 201 are parallelogram-shaped, and the housing 10 is a rectangular housing 10. Figure 1 The left side is the first end, and the right side is the second end. After the pole group 20 is placed in the shell 10, a first exhaust space 31 of a right triangle is constructed between the pole group 20 and the shell 10. In this way, when the pole group 20 has thermal runaway, the gas can be better gathered near the right angle area, so that the gas can be stably transported toward the explosion-proof valve, which is beneficial to the discharge of the gas. Here, it should be noted that the pole group 20 may not be a stacked structure of pole pieces 201, but may be a pole group 20 of other structures. This is not limited here and will not be repeated in the following embodiments. The present application changes the shape of the pole group 20, so that the first exhaust space 31 is added inside the shell 10 without changing the shape of the shell 10, thereby improving the exhaust effect while ensuring the energy density of the battery 100.
[0038] Therefore, according to the battery 100 of the embodiment of the utility model, by designing the shape of the electrode group 20, a first exhaust space 31 is constructed between the electrode group 20 and the shell 10, so that when the electrode group 20 is in thermal runaway, the high-temperature and high-pressure gas can be discharged more stably, and it is not easy to impact the electrode group 20 or the shell 10, which can reduce the safety risk of the electrode group 20 after thermal runaway.
[0039] In some embodiments of the present invention, Figure 1-Figure 3As shown, the battery 100 further includes a first explosion-proof valve 41, the housing 10 has a first end wall 103 at the first end, the housing 10 has a second end wall 104 at the second end, the first explosion-proof valve 41 is installed on the second end wall 104, and at least part of the first explosion-proof valve 41 is opposite to the first exhaust space 31. In other words, the second end of the first exhaust space 31 has a larger space, which can accommodate more high-temperature and high-pressure gas, and the first explosion-proof valve 41 is installed near the second end of the first exhaust space 31, so that the high-temperature and high-pressure gas can better break through the first explosion-proof valve 41, and can be directly discharged from the first explosion-proof valve 41, which can further prevent the high-temperature and high-pressure gas from impacting the electrode group 20 or the housing 10 during the process of flowing toward the first explosion-proof valve 41 along other flow channels, and effectively reduce the safety risk of the electrode group 20 after thermal runaway.
[0040] Reference Figure 1-Figure 3 In a specific example shown, the pole group 20 includes a plurality of stacked pole pieces 201, the pole pieces 201 are parallelogram-shaped, and the housing 10 is a rectangular housing 10. Figure 1 The left side is the first end, and the right side is the second end. After the pole group 20 is placed in the shell 10, a right-angled triangle first exhaust space 31 is constructed between the pole group 20 and the shell 10. In this way, when the pole group 20 has thermal runaway, the gas can be better gathered near the right-angle area, and the first explosion-proof valve 41 is installed near the right-angle area, so that the high-temperature and high-pressure gas can better break through the first explosion-proof valve 41 and can be directly discharged from the first explosion-proof valve 41.
[0041] In some embodiments of the present invention, the battery 100 further includes a first pole 51, which is mounted on the second end wall 104 and is disposed adjacent to the second side surface 22 opposite to the first side surface 21 of the pole group 20. That is, the installation position of the first pole 51 is far away from the first exhaust space 31, so that the influence of the high-temperature and high-pressure gas on the first pole 51 when the pole group 20 is in thermal runaway can be better avoided, so that the first pole 51 and the pole ear connected to the first pole 51 are not easily deformed or even melted, and the displacement of the pole group 20 in the housing 10 can be better avoided, and the explosion-proof valve can be ensured not to be blocked due to the displacement of the pole group 20, so that the high-temperature and high-pressure gas can be smoothly discharged from the explosion-proof valve.
[0042] In some embodiments of the present invention, the side opposite to the first side 21 of the pole group 20 is the second side 22, and the side wall of the shell 10 opposite to the second side 22 is the second side wall 102, and in the direction from the second end to the first end, the second side 22 gradually inclines toward a direction away from the second side wall 102 to construct a second exhaust space 32 between the second side 22 and the second side wall 102.
[0043] Reference Figure 1-Figure 3In a specific example shown, the pole group 20 includes a plurality of stacked pole pieces 201, the pole pieces 201 are parallelogram-shaped, and the housing 10 is a rectangular housing 10. Figure 1 The left side is the first end, and the right side is the second end. After the pole group 20 is placed in the shell 10, right-angled triangular exhaust spaces are constructed on both sides of the pole group 20 in the upper and lower directions. The two exhaust spaces are the first exhaust space 31 and the second exhaust space 32. In this way, when the pole group 20 has thermal runaway, the gas can be better gathered near the right-angle area, so that the gas can be stably transported toward the explosion-proof valve, which is beneficial to the discharge of the gas.
[0044] In some embodiments of the present invention, the battery 100 further includes a second explosion-proof valve 42, the housing 10 has a first end wall 103 at the first end, the second explosion-proof valve 42 is installed on the first end wall 103, and at least part of the second explosion-proof valve 42 is opposite to the second exhaust space 32. That is, the space at the first end of the second exhaust space 32 is large, which can accommodate more high-temperature and high-pressure gases, and the second explosion-proof valve 42 is installed near the first end of the second exhaust space 32, so that the high-temperature and high-pressure gas can better break through the second explosion-proof valve 42, and can be directly discharged from the second explosion-proof valve 42, which can further avoid the high-temperature and high-pressure gas from impacting the electrode group 20 or the housing 10 during the process of flowing toward the second explosion-proof valve 42 along other flow channels, and effectively reduce the safety risk of the electrode group 20 after thermal runaway. In addition, the present application can further improve the efficiency of high-temperature and high-pressure gas discharge by respectively arranging the first explosion-proof valve 41 and the second explosion-proof valve 42 at both ends of the electrode group 20, thereby helping to reduce the safety risk of the electrode group 20 when thermal runaway occurs.
[0045] In some embodiments of the present invention, Figure 1-Figure 3 As shown, the battery 100 also includes a second pole 52, which is installed on the first end wall 103 and is arranged adjacent to the first side surface 21. That is to say, the installation position of the second pole 52 is far away from the second exhaust space 32, so that the influence of the high-temperature and high-pressure gas on the second pole 52 when the pole group 20 has thermal runaway can be better avoided, so that the second pole 52 and the pole ear connected to the second pole 52 are not easy to be deformed or even melted, and the displacement of the pole group 20 in the shell 10 can be better avoided, and the explosion-proof valve will not be blocked due to the displacement of the pole group 20, so that the high-temperature and high-pressure gas can be smoothly discharged from the explosion-proof valve. Moreover, in the present application, by installing the first pole 51 and the second pole 52 at the two ends of the shell 10 respectively, the first pole 51 and the second pole 52 can be better kept as far away as possible from the high-temperature and high-pressure gas generated when the pole group 20 has thermal runaway.
[0046] In some embodiments of the present invention, Figure 1-Figure 3As shown, the pole group 20 includes a plurality of stacked pole pieces 201. In the projection plane perpendicular to the thickness direction of the pole piece 201, the projection of each pole piece 201 is a parallelogram, or the projection of each pole piece 201 is a rhombus. The parallelogram and rhombus-shaped pole pieces 201 have a simple structure, which can reduce production costs. In addition, the parallelogram or rhombus shape is relatively neat, which can facilitate the stacking operation of the pole pieces 201 and further reduce production costs.
[0047] Alternatively, if Figure 1-Figure 3 As shown, in the projection plane, the pole piece 201 has a first side edge 211 on the first side surface 21, the pole piece 201 has a first end edge 213 at the first end, the pole piece 201 and the second end have a second end edge 214, the intersection of the first side edge 211 and the first end edge 213 is the first intersection, the intersection of the first side edge 211 and the second end edge 214 is the second intersection, the straight line passing through the first intersection and perpendicular to the first end edge 213 is the first straight line, the straight line where the second end edge 214 is located is the second straight line, the intersection of the first straight line and the second straight line is the third intersection, and the distance between the third intersection and the second intersection is D1, which satisfies: 1mm≤D1≤6mm. That is, by making the pole piece 201 meet the above conditions, the first exhaust space 31 can be constructed in the shell 10 without affecting the energy density of the pole group 20, so as to discharge the high-temperature and high-pressure gas generated by the pole group 20 after thermal runaway.
[0048] Alternatively, if Figure 1-Figure 3 As shown, the first accommodating space and the second accommodating space are centrally symmetrical about the center point of the pole group 20, that is, the shapes and sizes of the first accommodating space and the second accommodating space can be exactly the same. In addition, the shapes and sizes of the first accommodating space and the second accommodating space can also be different. The dimensions satisfied by the first accommodating space are also satisfied by the second accommodating space, that is, in the projection plane, the pole piece 201 has a second side edge 212 on the second side surface 22, the pole piece 201 has a first end edge 213 at the first end, the pole piece 201 and the second end have a second end edge 214, the intersection of the second side edge 212 and the first end edge 213 is the fourth intersection, the intersection of the second side edge 212 and the second end edge 214 is the fifth intersection, the straight line passing through the fourth intersection and perpendicular to the first end edge 213 is the third straight line, the straight line where the second end edge 214 is located is the second straight line, the intersection of the third straight line and the second straight line is the sixth intersection, and the distance between the fifth intersection and the sixth intersection is D2, which satisfies: 1mm≤D2≤6mm.
[0049] Alternatively, if Figure 1-Figure 3As shown, in the projection plane, the pole piece 201 has a first side edge 211 on the first side surface 21, and the pole piece 201 has a first end edge 213 at the first end, and the angle a between the first end edge 213 and the first side edge 211 satisfies: 80°≤a1≤85°. That is to say, by making the pole piece 201 satisfy the above conditions, a first exhaust space 31 can be constructed in the shell 10 without affecting the energy density of the pole group 20, so as to discharge the high-temperature and high-pressure gas generated by the pole group 20 after thermal runaway.
[0050] Alternatively, if Figure 1-Figure 3 As shown, the first accommodation space and the second accommodation space are centrally symmetrical about the center point of the pole group 20, that is, the shapes and sizes of the first accommodation space and the second accommodation space can be exactly the same. In addition, the shapes and sizes of the first accommodation space and the second accommodation space can also be different. The dimensions satisfied by the first accommodation space are also satisfied by the second accommodation space, that is, the pole piece 201 has a second side edge 212 on the second side surface 22, and the pole piece 201 has a second end edge 214 at the second end, and the angle a2 between the second end edge 214 and the second side edge 212 satisfies: 80°≤a2≤85°.
[0051] It should be further explained that, in the above example, one of the first pole 51 and the second pole 52 is a positive pole, and the other of the first pole 51 and the second pole 52 is a negative pole. The pole piece 201 can be a positive pole piece 2 or a negative pole piece 3. The positive pole piece 2 and the negative pole piece 3 are similar in shape but different in size.
[0052] The utility model also provides an electrical device having the battery 100 of the above embodiment.
[0053] According to the electric equipment of the embodiment of the utility model, by being provided with the battery 100 of the above embodiment, when the electrode group 20 has thermal runaway, the high-temperature and high-pressure gas can be discharged better, and it is not easy to have an impact on the electrode group 20 or the shell 10, which can reduce the safety risk after the thermal runaway of the electrode group 20, thereby better protecting the electric equipment.
[0054] Optionally, the power-consuming device may be a vehicle or other device requiring the battery 100 , which is not limited here.
[0055] Other structures and operations of the battery 100 and the electrical equipment according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.
[0056] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0057] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.
Claims
1. A battery, characterized in that: include: A shell and a pole group installed in the shell, the pole group has a side surface which is a first side surface, the side wall of the shell opposite to the first side surface is a first side wall, and the first side surface gradually inclines in a direction from the first end to the second end in a direction away from the first side wall to construct a first exhaust space between the first side surface and the first side wall.
2. The battery according to claim 1, characterized in that It also includes a first explosion-proof valve, the shell has a first end wall at the first end, the shell has a second end wall at the second end, the first explosion-proof valve is installed on the second end wall, and at least a part of the first explosion-proof valve is opposite to the first exhaust space.
3. The battery according to claim 2, characterized in that It also includes a first pole, which is mounted on the second end wall and is disposed adjacent to a second side surface of the pole group that is opposite to the first side surface.
4. The battery according to claim 1, characterized in that The side opposite to the first side of the pole group is a second side, and the side wall of the shell opposite to the second side is a second side wall. In a direction from the second end to the first end, the second side surface gradually inclines toward a direction away from the second side wall, so as to construct a second exhaust space between the second side surface and the second side wall.
5. The battery according to claim 4, characterized in that It also includes a second explosion-proof valve. The shell has a first end wall at the first end. The second explosion-proof valve is installed on the first end wall, and at least a part of the second explosion-proof valve is opposite to the second exhaust space.
6. The battery according to claim 5, characterized in that It also includes a second pole, which is installed on the first end wall and is disposed adjacent to the first side surface.
7. The battery according to any one of claims 1 to 6, characterized in that The pole group includes a plurality of stacked pole pieces, and in a projection plane perpendicular to the thickness direction of the pole pieces, the projection of each pole piece is a parallelogram, or the projection of each pole piece is a rhombus.
8. The battery according to claim 7, characterized in that In the projection plane, the pole piece has a first side edge on the first side surface, the pole piece has a first end edge at the first end, the pole piece and the second end have a second end edge, the intersection of the first side edge and the first end edge is a first intersection, the intersection of the first side edge and the second end edge is a second intersection, a straight line passing through the first intersection and perpendicular to the first end edge is a first straight line, the straight line where the second end edge is located is opposite to the second straight line, the intersection of the first straight line and the second straight line is a third intersection, and the distance between the third intersection and the second intersection is D1 satisfying: 1mm≤D1≤6mm.
9. The battery according to claim 7, characterized in that In the projection plane, the pole piece has a first side edge at the first side surface, the pole piece has a first end edge at the first end, and an angle a between the first end edge and the first side edge satisfies: 80°≤a1≤85°.
10. An electrical device, characterized in that: A battery comprising the battery according to any one of claims 1 to 9.