CN220652146U - Partitioned battery shell and battery thereof - Google Patents
Partitioned battery shell and battery thereof Download PDFInfo
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- CN220652146U CN220652146U CN202322285187.1U CN202322285187U CN220652146U CN 220652146 U CN220652146 U CN 220652146U CN 202322285187 U CN202322285187 U CN 202322285187U CN 220652146 U CN220652146 U CN 220652146U
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Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a partitioned battery case, which is provided with an integrally formed case, wherein the case is provided with at least 2 cavities for placing pole cores; the ratio of the side L1 to the side L2 of the cavity ranges from 1 to 2; wherein, the side L1 is the long diameter of the cavity, and the side L2 is the short diameter of the cavity; the total volume of the cavity accounts for not less than 75% of the volume of the shell. The constraint capacity of the shell on the internal winding core is enhanced, the selection range of battery materials is widened, the expansion of the battery is reduced, and the energy density and volume grouping efficiency of the battery are improved.
Description
Technical Field
The utility model relates to the technical field of battery shells, in particular to a partitioned battery shell and a battery thereof.
Background
With the rapid development of new energy automobiles and energy storage industry, the demand and the use amount of lithium ion batteries in the market are rapidly increased. Because of the requirements of the new energy automobile and the energy storage application scene on the high-energy and high-power output of the battery system, the high-energy and high-power battery module or the battery system is generally realized through a plurality of lithium ion batteries connected in series and parallel to meet the scene use requirements. However, due to the limitation of physical space in the practical application scenes of the new energy automobiles and the medium and small energy storage, smaller volume requirements are put forward for battery systems applied to the new energy automobiles and the medium and small energy storage systems.
On the outer structure of mainstream square shell battery in market, wholly be the rectangle, the height and the length of battery are greater than thickness far away, are favorable to the volume utilization ratio promotion of utmost point core in the battery, but can't overcome the inflation of utmost point core at battery cycle in-process battery case to along with the design length or the high increase of battery case, and when using the electrode material that energy density is higher and inflation is more obvious in the battery case, the restraint effect of battery case can reduce, the outside apparent deformation of battery can appear, especially in the volume inflation of battery thickness direction, thereby influence the security performance of battery. Therefore, the battery in the prior art cannot further improve the energy density and the capacity of the battery on the basis of obtaining higher volume utilization rate. In addition, because the volume ratio of the pole cores is increased, the close contact between the pole cores can lead the heat generated by the internal pole cores to be unable to rapidly diffuse to the surface of the pole cores in the cycle process of the battery, and the thermal runaway is easy to be caused; the efficiency of the battery is also reduced due to the concentrated winding of the pole pieces; due to the more winding of the pole pieces, uneven stress at the corners of the pole pieces is easy, resulting in loss of energy density.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model discloses a partitioned battery case, which can be provided with at least two pole core placement areas, fully utilizes the internal space of a battery and promotes the higher volume utilization rate of pole cores in the battery. On the basis that the battery shell further designed can restrict the expansion of the pole core, the uniform heat dissipation of the pole core is improved, so that the safety performance of the battery is improved, and the energy, capacity and energy density of the battery can be further improved.
The utility model is realized by the following technical scheme:
the utility model provides a partitioned battery case, which is provided with an integrally formed case, wherein the case is provided with at least 2 cavities for placing pole cores;
the range (L1/L2) of the ratio of the side L1 to the side L2 of the cavity is 1-2; wherein, the side L1 is the long diameter of the cavity, and the side L2 is the short diameter of the cavity.
The total volume of the cavity accounts for not less than 75% of the volume of the shell.
According to the design, the integrated shell is provided with the cavities, so that the mutual influence among pole cores in the battery can be reduced. On this basis, we have still set up 2 at least cavitys in the casing and are used for placing the utmost point core, on the partition set up the cavity can promote the efficiency of battery on the basis, can also promote the radiating ability of utmost point core in the battery cycle process. In addition, the design of the multiple cavities can promote the volume ratio of the pole core to be equal to that of the existing foundation, and the design of the cavities can give the pole core stronger binding capacity, so that the volume change of the pole core can be limited, and the volume expansion of the battery can be reduced; on one hand, the cavity has higher binding capacity, so that the battery shell can be promoted to extend longer in the length or height direction, and the capacity and energy of the battery can be further improved; on the other hand, more pole cores can be wound in the cavity, and the energy density and the capacity of the battery can be further improved. Therefore, in the battery case, the heat dissipation capacity, the energy density and the capacity of the battery can be further improved through the design of the battery case on the basis that the volume ratio of the pole core in the battery is equal to that of the prior art.
In the utility model, L1 is the long diameter of the cavity, wherein the long diameter refers to the long side in the cross section of the cavity, and L2 is the short diameter of the cavity, wherein the short diameter refers to the short side in the cross section of the cavity. As shown in fig. 3.
As a further solution, the ratio of the side L1 to the side L2 of the cavity ranges from 1 to 1.25. The cavity with a more uniform shape is more favorable for obtaining, so that the heat dissipation to the periphery of the cavity is more favorable for being uniform, and the volume expansion of the battery is more favorable for being reduced.
As a further scheme, the fillet radius R2 of the cavity is 0-0.5 times of L2. The fillet radius of the cavity is designed to control the shape of the cavity, so that on one hand, the clearance between the cavity and the cavity can be reduced, the volume ratio of the pole core in the battery can be further improved, the energy density of the battery can be improved, on the other hand, the limitation of the cavity to the pole core can be facilitated, the constraint of the pole core and the uniform heat dissipation of the pole core can be improved, and the safety of the battery can be improved. The fillet is a section of arc tangent to two sides of the angle and is used for replacing the original angle, and the size of the fillet is represented by the radius of the circle corresponding to the fillet, namely the radius of the fillet; when the fillet radius R2 is 0 times L2, i.e. R2 is 0, the cavity angle is a right angle of 90 °.
As a further scheme, the fillet radius R3 of the shell is 0-1 times of R2. The relation between the fillet radius of the shell and the fillet radius of the cavity is further designed, so that the volume ratio of the cavity in the shell is further improved, and the energy density of the battery is further improved. When the corner radius R3 is 0 times R2, i.e. R3 is 0, the housing angle is a 90 ° right angle.
As a further aspect, the radius R3 of the rounded corner of the shell is 1 time R2. Further increasing the volume ratio of the total volume of the cavity in the housing.
As a further aspect, the arrangement of the cavities in the housing is selected from one of the aspects i-iii:
scheme i: the cavity is arranged in a single column or a single row;
ii scheme: the cavities are arranged in parallel under the arrangement of at least two columns and at least two rows;
iii scheme: the cavities are arranged in parallel and staggered mode in any two adjacent rows or any two adjacent columns which are parallel to each other. On the basis of promoting the even heat dissipation of the pole core in the battery, the battery can also have higher volume utilization rate, thereby being beneficial to improving the quality energy density of the battery.
As a further scheme, a cooling channel is further arranged in the shell, and the cooling channel is used for cooling a cavity adjacent to the cooling channel. The cooling channel can be selected by a person skilled in the art according to practical situations, and the design of the cooling channel can further improve the heat dissipation capacity of the battery.
As a further aspect, the relative position of the cooling channel and the cavity includes at least one of the following:
(I) The cooling channels are arranged between the adjacent cavities;
(II) any four adjacent cavities form two rows and two columns which are parallel to each other, and the cooling channels are arranged in the middle of the four adjacent cavities;
(III) the cooling channels are disposed in the middle of any three adjacent parallel offset disposed cavities of any two adjacent rows or any two adjacent columns that are parallel to each other. On the basis of promoting uniform and rapid heat dissipation among battery pole cores, the battery can be further promoted to have higher volume utilization rate.
As a further solution, in order to improve the heat dissipation effect of the cooling channel, a person skilled in the art may select the shape of the cooling channel according to the actual situation of the person, and may specifically be a regular or irregular shape such as square, rectangle, ellipse, star, polygon, etc. As a preferred example, the cooling channels may be arranged in a circular shape, thereby facilitating uniform heat absorption of the cooling fluid in the cooling channels and thus uniform heat dissipation of the battery.
As a further proposal, the diameter of the cooling channel0mm to R2->Multiple mm.
As a further scheme, the minimum thickness between the cavities is 0.1mm-10mm. The thickness between the cavities is selected to balance heat dissipation inside the cavities and limit the volume change of the pole piece.
As a further proposal, the minimum thickness of the shell is 0.1mm-10mm. The minimum thickness of the housing in the present utility model is the minimum thickness between the housing and the cavity.
As a further proposal, the thickness between the cavities is the same as the thickness of the shell. Is beneficial to industrialized production.
As a further scheme, the fillet radius R2 of the cavity is 0.1 times of L2. The device is more beneficial to improving the volume ratio of the cavity in the shell and the uniformity of stress at the corner of the pole core, so that the service life of the battery is prolonged while the capacity of the battery is improved.
As a further scheme, the shell is made of one of aluminum alloy, steel, copper alloy and magnesium alloy.
The utility model also provides a battery with the partitioned battery shell structure, which is selected from one of the i-ii schemes:
in the scheme of the scheme, the battery further comprises at least 2 pole cores, any one of the pole cores is placed in a single cavity, the ratio of the side H1 to the side H2 of the pole core ranges from 1 to 2, H1 is the long diameter of the pole core, H2 is the short diameter of the pole core, and the radius R1 of a round angle of the pole core is 0.5 times to 1 time of R2;
in the ii scheme, the battery further comprises at least 2 pole cores, at least one pole core is placed in one cavity, the ratio of the side H1 to the side H2 of the pole cores ranges from 1 to 2, H1 is the long diameter of the pole cores, H2 is the short diameter of the pole cores, and the radius R1 of the round corners of the pole cores is 0.5 to 1 time of R2. In order to promote the increase of the volume utilization rate of the battery pole core, so that the weight energy density of the battery is improved, the height-width ratio and the fillet radius R1 of the pole core are further designed, and the volume utilization rate of the pole core in the battery is further improved to the greatest extent on the basis that the pole core in the battery has a higher volume ratio. The design of R1 can also promote the consistency of the shapes of the pole core and the cavity, thereby being beneficial to better binding the volume expansion of the pole core by the cavity; in addition, the heat in the pole core can be uniformly diffused to the periphery in the cycle process of the battery, so that the uniform heating of the battery is improved, the phenomenon of thermal runaway in the cycle process of the battery is reduced, and the safety of the battery is improved; the design of R1 can also solve the technical problem of uneven stress at the corner of the pole core.
Further preferably, the solution i can sufficiently suppress the volume expansion of the pole piece in the cavity and simultaneously can uniformly dissipate heat.
As a further scheme, the pole core is a winding core.
As a further proposal, the ratio of the side H1 and the side H2 of the pole core (H1/H2) is in the range of 1-1.25, wherein H1 is the long diameter of the pole core, and H2 is the short diameter of the pole core. In the utility model, H1 is the long diameter of the pole core, wherein the long diameter refers to the long side in the cross section of the pole core, and H2 is the short diameter of the pole core body, wherein the short diameter refers to the short side in the cross section of the pole core. As shown in fig. 7.
As a further aspect, the fillet radius R1 of the pole core is 1 time R2. The volume ratio of the pole core in the cavity is more beneficial to improvement.
By further adopting the scheme, on the basis of the design, the energy and the capacity of the battery are further improved on the basis that the volume ratio of the cavity in the battery is ensured to be equal to that in the prior art. As an example: compared with more pole cores in the prior art, the design of the cavity can better restrict the volume change of more pole cores, thereby further improving the energy density of the battery.
As a further scheme, the shell further comprises an upper cover plate and a lower cover plate. The construction of the upper cover plate is the same as that of the lower cover plate.
As a further scheme, be provided with first notes liquid hole, first utmost point post, first relief valve, first reservation cooling channel mouth on the upper cover plate.
As a still further aspect, the first reserved cooling channel is in communication with a cooling channel.
As a further scheme, the lower cover plate is provided with a second liquid injection hole, a second pole, a second pressure relief valve and a second reserved cooling channel opening.
As a further scheme, the second reserved cooling channel is communicated with the cooling channel.
As a further scheme, the shell comprises 2 cavities, the radius R2 of the fillets of the cavities is 4.2mm-4.6mm, the edge L1 of the cavities is 42mm-46mm, the edge L2 of the cavities is 42mm-46mm, and the cavities are arranged in a single row or a single column; the R1 of the pole core is 4.2mm-4.6mm, the H1 of the pole core is 42mm-46mm, the H2 of the pole core is 42mm-46mm, the length of the pole core is 270mm-290mm, the R3 of the shell is 4.2mm-4.6mm, the D1 of the shell is 89mm-93mm, the D2 of the shell is 44mm-48mm, and the length of the shell is 290mm-310mm.
As a further scheme, the shell comprises 3 cavities, the radius R2 of the fillets of the cavities is 4.2mm-4.6mm, the edge L1 of the cavities is 42mm-46mm, the edge L2 of the cavities is 42mm-46mm, and the cavities are arranged in a single row or a single column; the R1 of the pole core is 4.2mm-4.6mm, the H1 of the pole core is 42mm-46mm, the H2 of the pole core is 42mm-46mm, the length of the pole core is 270mm-290mm, the R3 of the shell is 4.2mm-4.6mm, the D1 of the shell is 134mm-138mm, the D2 of the shell is 44mm-48mm, and the length of the shell is 290mm-310mm.
As a further scheme, the shell comprises 4 cavities, the radius R2 of the fillets of the cavities is 4.2mm-4.6mm, the edge L1 of the cavities is 42mm-46mm, the edge L2 of the cavities is 42mm-46mm, the cavities are arranged in parallel in two rows and two columns, and a cooling channel is arranged in the middle of the 4 cavities; the R1 of the pole core is 4.2mm-4.6mm, the H1 of the pole core is 42mm-46mm, the H2 of the pole core is 42mm-46mm, the length of the pole core is 270mm-290mm, the R3 of the shell is 4.2mm-4.6mm, the D1 of the shell is 89mm-93mm, the D2 of the shell is 89mm-93mm, and the length of the shell is 290mm-310mm.
The utility model has the characteristics and beneficial effects that:
(1) The utility model adopts the integrated shell, thereby improving the production efficiency and reducing the manufacturing cost.
(2) According to the utility model, the battery shell adopts the partition arrangement, so that the cooling efficiency is improved, and the power density of the battery and the volume utilization rate of the pole core in the battery are improved. The battery of the battery shell has better heat dissipation efficiency, thereby being beneficial to improving the safety of the battery.
(3) According to the design, the multi-cavity design and the integrally formed shell are matched, so that the pole core is ensured to have a higher volume ratio in the battery. The multi-cavity design of the utility model can limit the volume change of the pole core and reduce the volume expansion of the battery; on one hand, the cavity has higher binding capacity, so that the battery shell can be promoted to extend longer in the length or height direction, and the capacity and energy of the battery can be further improved; on the other hand, more pole cores can be wound in the cavity, and the energy density and the capacity of the battery can be further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of a battery of this embodiment.
Fig. 2 is an exploded view of the battery of the present embodiment.
Fig. 3 is a sectional view of the case of the present embodiment and a sectional view of the battery, wherein fig. 3a is a sectional view of the case and fig. 3b is a sectional view of the battery.
Fig. 4 is a sectional view of the case of the present embodiment and a sectional view of the battery, wherein fig. 4a is a sectional view of the case and fig. 4b is a sectional view of the battery.
FIG. 5 is a sectional view of the case of the present embodiment and a sectional view of the battery, wherein FIG. 5a is a sectional view of the case and FIG. 5b is a sectional view of the battery
Fig. 6 is a sectional view of the cavity and a sectional view of the battery of the present embodiment, wherein fig. 6a is a sectional view of the cavity and fig. 6b is a sectional view of the battery.
Fig. 7 is a cross-sectional view of a single pole piece and a schematic view of a single pole piece of the present embodiment, wherein fig. 7a is a cross-sectional view of a single pole piece and fig. 7b is a schematic view of a single pole piece.
Fig. 8 is a sectional view of the case of the present embodiment and a sectional view of the battery, wherein fig. 8a is a sectional view of the case and fig. 8b is a sectional view of the battery.
Fig. 9 is a schematic diagram of an upper cover plate of the present embodiment.
Fig. 10 is a schematic diagram of the lower cover plate of the present embodiment.
Wherein the above figures include the following reference numerals:
1-a housing; 11-a cavity; 12-cooling channels; 2-pole cores; 3-an upper cover plate; 4-a lower cover plate; 31-a first pole; 32-a first reserved cooling channel; 33-a first liquid injection hole; 34-a first pressure relief valve; 41-second pole; 42-a second reserved cooling channel port; 43-a second liquid injection hole; 44-a second pressure relief valve; h1-pole core edges; h2-pole core edges; r1 is the radius of the fillet of the pole piece; l1-cavity edge; l2-cavity side; r2-the fillet radius of the cavity; d1-shell side; d2—a shell side; r3-the radius of the shell; e1-pole piece length; e3-shell length;-diameter of the cooling channel.
Detailed Description
In order to facilitate understanding of the structure of a partitioned battery case of the present utility model, a more complete description of the structure of a partitioned battery case of the present utility model will be provided below, which will not limit the scope of the present utility model.
As can be seen from fig. 1 and fig. 2, the partitioned battery case of the present utility model is an integrally formed case 1, and the integrally formed case 1 is beneficial to reducing welding connection of the battery case in the conventional process, so as to reduce cracking of the case welding part in the use process of the battery, and improve the safety of the battery; and the production efficiency is improved, and the welding production process is reduced. We further set the housing to at least 2 cavities 11, and the volume ratio of the cavities 11 in the housing 1 is not less than 75%, the cavities 11 being used for placing the pole pieces 2. The arrangement of the multiple cavities is beneficial to heat dissipation of the pole core in the battery circulation process, and heat generated in the battery circulation process is dispersed by taking the cavities as units; the second aspect can also limit the pole core, the pole core is arranged in a plurality of cavities in a dispersing way, and therefore the volume expansion rate of the whole battery is reduced; the arrangement of the cavity in the third aspect is beneficial to improving the volume utilization rate in the battery shell, so that the energy density of the battery is improved; the fourth aspect can also improve the safety and cycle performance of the battery. In the utility model, the design of the multiple cavities can promote the pole core in the battery to have higher volume ratio, the cavity 11 can also provide binding capacity, the number of turns of the pole core wound in the battery can be further increased or the pole core can be further extended in the length or height direction of the battery shell, the energy density and the capacity of the battery can be improved, and the volume expansion rate of the battery can not be increased.
We have further devised the relationship between the housing 1 and the cavity 11 in order to further increase the volume ratio of the cavity 11 in the housing 1 on the basis of obtaining a volume ratio of the cavity 11 in the housing 1 of not less than 75%, as illustrated in fig. 3 to 8. In order to promote a better fit between the housing 1 and the cavity 11, we have also devised a range of ratios (L1/L2) of the sides L1 and L2 of the cavity 11 between 1 and 2; the side L1 is the long diameter of the cavity 11, the side L2 is the short diameter of the cavity 11, and the radius R2 of the fillet of the cavity 11 is 0-0.5 times of L2. We can find from fig. 3 and 4 that when the corner radius R2 of the cavity 11 is larger, the corner of the cavity 11 will be more oriented to a large arc, as shown in fig. 4, when the corner radius R2 is smaller, the corner of the cavity will be more oriented to a small arc, as shown in fig. 3, and such a design can not only promote fewer gaps between the corner of the cavity 11 and the corner of the housing 1, and increase the volume ratio of the cavity 11 in the housing 1; and the ratio of L1/L2 of the cavity 11 is used for regulating the size of the shell 1 by using the size of the cavity 11, so that the volume ratio of the cavity 11 in the shell 1 is increased. In order to better promote the cavity 11 and the shell 1 to have smaller pores at the corners, we further design the radius R3 of the rounded corner of the shell 1 to be 0-1 times of R2, and further improve the volume ratio of the cavity in the shell, thereby being beneficial to improving the energy density of the battery, and also being beneficial to better limiting the shape of the pole core and uniformly radiating the pole core, and further being beneficial to improving the safety performance of the battery.
On this basis, we further found that when the ratio of the side L1 to the side L2 of the cavity 11 ranges from 1 to 1.25, the shape of the cavity 11 is more regular, which is beneficial to uniform heat dissipation of the pole core 2 in the cavity 11, and also can reduce the volume expansion of the pole core 2.
We can further increase the volume ratio of the cavity 11 in the housing 1 by arranging the cavity 11 in the housing 1, and first, we can arrange the cavity 11 in a single column or a single row arrangement, as shown in fig. 6 and 8; secondly, we can arrange the cavities 11 in at least two columns and at least two rows parallel to each other, as shown in fig. 3 and 4; thirdly, the cavities 11 can be arranged in parallel and staggered manner in any two adjacent rows or any two adjacent columns which are parallel to each other. The design of the relative position of the cavity is beneficial to the tight connection between the cavity inside the shell and the cavity. On the basis of promoting the inside higher volume utilization rate that has of battery case, improve the even heat dissipation of the utmost point core in the battery, promoted the quality energy density and the security performance of battery.
When the cavities 11 in the case 1 are more and the arrangement is more diversified, we further design the cooling channels 12 in the case 1, and the cooling channels 12 can be used for reducing the temperature of the cavities 11 adjacent to the cooling channels 12, so as to enable the cooling channels 12 to uniformly absorb the heat in the cavities 11, and be beneficial to uniformly radiating the heat in the battery cavities 11. The relative positions of the cooling channels 12 and the cavities 11 may be at least one selected from the following, and first, the cooling channels 12 may be disposed between adjacent cavities 11; second, any four adjacent cavities 11 form two rows and two columns parallel to each other, and the cooling channels 12 are arranged in the middle of the four adjacent cavities 11, as shown in fig. 3 and 4; third, the cooling channels 12 are disposed in the middle of any two adjacent parallel and offset cavities 11 in any two adjacent rows or any two adjacent columns. On the basis of obtaining the heat dissipation effect of the cooling channel, a person skilled in the art can design the shape of the cooling channel 12 according to the actual situation, so that the cavity 11 can sufficiently cool the cavity 11 around the cooling channel 12 on the basis of obtaining a higher volume ratio. In the present utility model, as a preferred example, a circular cooling passage is designed, which is more advantageous in that the cooling liquid in the cooling passage absorbs heat uniformly. The size of the cooling channel can be adjusted according to actual conditions in the field, so that the cooling channel has more remarkable heat dissipation effect on the cavity.
On the basis of designing the cavity 11 and the shell 1, we further design the shape of the pole core 2, so that the mass ratio of the pole core 2 in the cavity 11 is improved. We further design the pole piece 2 to have a shape matching the cavity 11, and further design the range of the ratio of the side H1 and the side H2 of the pole piece 2 (H1/H2) to be 1-2, where H1 is the long diameter of the pole piece 2, H2 is the short diameter of the pole piece 2, and the radius R1 of the round corner of the pole piece 2 is 0.5-1 times of R2. The design of the shape of the pole core 2 is consistent with the cavity 11, so that the volume ratio of the pole core 2 is more, the energy density of the battery is improved, the shape of the winding shape is more uniform and symmetrical, the design of the round corner radius R1 of the pole core 2 is facilitated, the phenomenon of uneven stress at the corner of the pole core in the winding process of the battery can be reduced, the damage of the pole core can be reduced, and the service life of the battery can be prolonged. In order to further promote uniform heat dissipation and reduce volume expansion of the pole piece 2, we further prefer that the ratio of the sides H1 and H2 of the pole piece 2 (H1/H2) range from 1 to 1.25.
In order to promote the cavity 11 to have better binding capacity on the basis, we further design the minimum thickness between the cavity 11 and the minimum thickness of the shell 1 to be 0.1mm-10mm. Where the minimum thickness of the housing 1 refers to the minimum thickness between the housing 1 and the cavity.
We also provide an upper cover plate 3, a lower cover plate 4 in the cell. The construction of the upper cover plate 3 is the same as that of the lower cover plate 4.
As shown in fig. 9, the upper cover plate 3 is provided with a first liquid injection hole 33, a first pole 31, a first pressure release valve 34, and a first reserved cooling channel 32. The first reserved cooling gallery 32 communicates with the cooling gallery 12. Facilitating the flow of coolant into the battery. The lower cover plate 4 is provided with a second liquid injection hole 43, a second pole 41, a second pressure relief valve 44 and a second reserved cooling channel port 42. The second reserved cooling gallery 42 communicates with the cooling gallery 12. Facilitating the flow of coolant into the battery.
In the utility model, filling designs among cavities in the battery shell and between the outer surface of the cavity and the shell can be replaced, for example, regular or irregular hollowed designs such as circles, ellipses, triangles, rectangles, polygons and the like are used for replacing solid filling of the design;
the shape and structural design of the inner and outer surfaces of the shell and/or the inner and outer surfaces of the cavity can be replaced by adding grooves, convex grooves, pits, convex points and the like to replace the smooth and flat surfaces of the shell and/or the cavity.
We have further devised different sizes and different arrangements of cavities to obtain partitioned battery cases, and used the partitioned battery cases with the structure of the present utility model in batteries, and further studied the improvement of the design of the present utility model to the electrical properties of the batteries, as shown in tables 1 to 2.
The material system and preparation process used in the examples of the present utility model are as follows:
1) The mass ratio of the positive electrode material system is active substance Li (Ni 0.9 Co 0.05 Mn 0.05 )O 2 Conductive agent carbon nanotube, conductiveThe binder PVDF (polyvinylidene fluoride) =98:0.5:0.5:1, the current collector is made of 12 mu m carbon-coated aluminum foil, and the positive plate is prepared by pulping, coating and rolling the material;
the mass ratio of the anode material system is that the active substance carbon black, conductive agent Super P, dispersant carboxymethyl cellulose, binder styrene-butadiene rubber=96.3:1:1.2:1.5, the current collector adopts 6 mu m copper foil, and the anode material is prepared into an anode sheet after pulping, coating and rolling;
2) The positive plate, the negative plate and the 12 mu m ceramic-coated polyethylene diaphragm are coiled and shaped to prepare a pole core;
3) The needed pole core is welded by a cover plate, is put into a shell, is welded by a seal, is dried, is injected with liquid and is formed into a corresponding embodiment;
4) The solute of the electrolyte is 1mol/L lithium hexafluorophosphate, and the solvent is ethylene carbonate and diethyl carbonate in a volume ratio of 1:1.
The conditions for the electrical performance test were:
charging at 0.33C rate, discharging at 0.33C rate, and testing voltage range of 2.8V-4.3V, temperature of 17-27 deg.C, relative humidity of 10-90% and atmospheric pressure of 86-106 kPa.
Table 1 dimensional parameters of the batteries of examples and comparative examples of the present utility model
Table 2 test results of the batteries of the examples and comparative examples of the present utility model
| - | capacity/Ah | energy/Wh | Weight energy Density/(Wh/kg) |
| Example 1 | 528 | 1953 | 297 |
| Example 2 | 514 | 1902 | 291 |
| Example 3 | 491 | 1818 | 281 |
| Example 4 | 459 | 1699 | 266 |
| Example 5 | 459 | 1699 | 260 |
| Example 6 | 459 | 1699 | 262 |
| Example 7 | 459 | 1699 | 270 |
| Example 8 | 459 | 1699 | 277 |
| Example 9 | 459 | 1699 | 287 |
| Example 10 | 1188 | 4394 | 300 |
| Example 11 | 792 | 2930 | 298 |
| Example 12 | 396 | 1465 | 294 |
| Example 13 | 264 | 977 | 293 |
| Example 14 | 634 | 2347 | 299 |
| Example 15 | 794 | 2938 | 301 |
| Example 16 | 1060 | 3923 | 302 |
| Comparative example 1 | 26 | 97 | 273 |
| Comparative example 2 | 161 | 595 | 291 |
We first compare the present utility model example 1-example 16 with comparative example 1-comparative example 2, and we find that the battery of the present utility model significantly extends the length direction of the battery case on the basis of the battery case of the prior art, and obtains higher capacity and energy on the premise that the obtained battery has higher energy density. Therefore, the battery case has higher energy and capacity on the basis of higher volume ratio of the pole core. Therefore, by the design of the battery case, the design of the utility model also solves the problems that the electrode core in the battery has higher volume ratio: firstly, in the prior art, on the basis of higher volume occupation of a pole core in a battery, the volume expansion rate of the pole core cannot be well overcome, and secondly, in the prior art, the energy and the capacity of the battery cannot be further improved, so that the expansion of the battery is more remarkable; third, the battery case of the prior art cannot be extended further in the length or height direction, which may result in a significant reduction in the restraining ability of the battery case to the pole piece.
Comparing example 1, example 14-example 16, it was found that when the ratio of the sides L1 and L2 of the cavity ranges from 1 to 2 (L1/L2), it is advantageous to obtain a battery case having a higher cavity volume ratio, and on this basis, it is advantageous to further improve the binding capacity of the battery case to the electrode core, improve the energy density and capacity of the battery, and reduce the expansion of the battery by the following design.
On this basis, we further compare examples 1-4, we can find that example 1 has higher energy density and capacity, we consider that as the ratio of the fillet radius R2 of the cavity to the minor diameter L2 of the cavity increases, we will reduce the volume ratio of the cavity in the housing, thereby reducing the energy density, capacity and energy of the battery, in order to promote the volume ratio of the cavity in the battery of the utility model above 75%, we have chosen that the fillet radius R2 of the cavity is 0-0.5 times the L2. We have further found that when the ratio of the fillet radius R2 of the cavity to the minor diameter L2 of the cavity is reduced, the cavity has a higher volume fraction, and in the present utility model, the cavity is used to limit the pole core, so that the pole core placed in the cavity has a higher volume fraction, and at the same time, the pole core damage caused by the pole core finally wound at the corner is reduced, thereby improving the service life of the battery. Therefore, we further select the fillet radius R2 of the cavity to be 0.1 times L2.
On this basis, we further compare examples 4-6 to find that, although the data of examples 4-6 are not greatly different, we find that the volume fraction of the cavity in the housing can be further increased only when the corner radius R3 of the housing and the corner radius R2 of the cavity are closer; similarly, when the fillet radius R1 of the pole core and the fillet radius R2 of the cavity are closer, the mass ratio of the pole core in the cavity can be further improved, thereby being beneficial to improving the capacity and energy of the battery. Therefore, it is further preferable that the corner radius R3 of the case is 0 to 1 times R2, and the corner radius R1 of the pole core is 0.5 to 1 times R2. And when the fillet radius between the cavity and the pole core is closer, the volume of the pole core in the cavity is the highest, and the battery has higher energy density. On this basis, we still further prefer that the fillet radius R1 of the pole piece is 1 times R2.
We have further devised the distribution of cavities in the housing, as in example 1, example 10-example 13. We can find that the design of the multiple cavities well limits the shape of the pole core and the compactness of the pole core, thereby improving the energy density and capacity of the battery, and being beneficial to the heat dissipation. The arrangement of the cooling channels according to the utility model may be used as a more preferred solution.
We can also design cooling channels in the housing, as found by comparison of example 4, example 7-example 9. The size of the cooling channels can be adjusted by a person skilled in the art according to the actual situation. We can find by comparison of example 4, example 7-example 9 that the weight energy density of the battery increases when the cooling channel is increased. The realization is that the design of the partition shell can promote the cavity to well limit the shape of the pole core and the compactness of the pole core, and promote more pole cores to be wound in the cavity, so that the mass energy density of the battery is increased when the cooling channel is larger; and the size of the cooling channel can be increased, so that the heat dissipation performance of the battery can be increased on the basis of increasing the weight energy density of the battery. The design of the multiple cavities can better limit the pole cores on the basis of higher volume ratio of the pole cores, adjust the compactness between the pole cores, further wind more pole cores and further improve the capacity and energy density of the battery.
In summary, the battery case of the utility model not only can promote the battery core to have a volume ratio of 75% in the battery, but also can further improve the capacity, energy density and heat dissipation of the battery and reduce the volume expansion of the battery.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present utility model, and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A partitioned battery case, characterized in that it has an integrally formed case (1) having at least 2 cavities (11) for placing pole pieces (2);
the ratio of the side L1 to the side L2 of the cavity (11) ranges from 1 to 2; wherein, the side L1 is the long diameter of the cavity, and the side L2 is the short diameter of the cavity;
the volume ratio of the total volume of the cavity (11) in the shell (1) is not less than 75%;
the fillet radius R2 of the cavity (11) is 0-0.5 times of L2;
the fillet radius R3 of the shell (1) is 0-1 times of R2;
the arrangement of the cavity (11) in the housing (1) is selected from one of the i-iii schemes:
scheme i: the cavities (11) are arranged in a single row or a single line;
ii scheme: in the arrangement of at least two columns and at least two rows, the cavities (11) are arranged in parallel;
iii scheme: in any two adjacent rows or any two adjacent columns which are parallel to each other, the cavities (11) are arranged in parallel and staggered mode.
2. A partitioned battery case according to claim 1, wherein the ratio of the sides L1 and L2 of the cavity (11) ranges from 1 to 1.25, and the corner radius R2 of the cavity (11) is 0.1 times L2.
3. A partitioned battery case according to claim 1, wherein the corner radius R3 of the case (1) is 1 time R2.
4. A partitioned battery case according to claim 1, wherein a cooling passage (12) is further provided in the case (1), the cooling passage (12) being for cooling the cavity (11) adjacent to the cooling passage (12).
5. A partitioned battery case according to claim 4, wherein the relative position of the cooling passage (12) and the cavity (11) includes at least one of:
(I) The cooling channels (12) are arranged between the adjacent cavities (11);
(II) any four adjacent cavities (11) form two rows and two columns which are parallel to each other, and the cooling channels (12) are arranged in the middle of the four adjacent cavities (11);
(III) the cooling channels (12) are arranged in the middle of any two adjacent parallel staggered cavities (11) of any two adjacent rows or any three adjacent columns which are parallel to each other.
6. A partitioned battery case according to claim 1, wherein the minimum thickness between the cavities (11) and the cavities (11) is 0.1mm-10mm.
7. A partitioned battery case according to claim 1, wherein the minimum thickness of the case (1) is 0.1mm to 10mm.
8. A battery having the partitioned battery case structure of any one of claims 1-7, wherein the battery is selected from one of the i-ii schemes:
in the scheme of the scheme, the battery further comprises at least 2 pole cores, any one of the pole cores is placed in a single cavity, the ratio of the side H1 to the side H2 of the pole core ranges from 1 to 2, H1 is the long diameter of the pole core, H2 is the short diameter of the pole core, and the radius R1 of a round angle of the pole core is 0.5 times to 1 time of R2;
in the ii scheme, the battery further comprises at least 2 pole cores, at least one pole core is placed in one cavity, the ratio of the side H1 to the side H2 of the pole cores ranges from 1 to 2, H1 is the long diameter of the pole cores, H2 is the short diameter of the pole cores, and the radius R1 of the round corners of the pole cores is 0.5 to 1 time of R2.
9. The battery of claim 8, wherein the pole piece is a jellyroll.
10. The battery of claim 8, wherein the ratio of side H1 to side H2 of the pole piece ranges from 1 to 1.25, wherein H1 is the long diameter of the pole piece and H2 is the short diameter of the pole piece; the fillet radius R1 of the pole core is 1 time of R2.
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Effective date of registration: 20241008 Address after: Room 101, 1st Floor, Building 3, No. 10 Yanqi Hexi 1st Road, Yanqi Economic Development Zone, Huairou District, Beijing 101407 Patentee after: Zhonggu Times (Beijing) New Energy Technology Co.,Ltd. Country or region after: China Address before: 213300 room 228, 29 Chuangzhi Road, Kunlun Street, Liyang City, Changzhou City, Jiangsu Province Patentee before: TIANMU LAKE INSTITUTE OF ADVANCED ENERGY STORAGE TECHNOLOGIES Co.,Ltd. Country or region before: China Patentee before: Zhonggu Times (Beijing) New Energy Technology Co.,Ltd. |