Battery structure
By designing the first elastic partition supporting battery in the hard-shell battery, the problem of the battery swelling and loose pole plates under full charge is solved, the pole plates are closely contacted, and the service life and safety performance of the battery are improved.
Patent Information
- Application Number
- CN202421882080.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-05
AI Technical Summary
The hard-shell battery is prone to swelling when fully charged, damage the shell and poses safety risks; if the shell ratio is designed to be too small, the internal pole plate of the battery cell will be loose, resulting in poor interface, increased internal resistance and reduced cycle life.
A battery structure is designed, including a housing, a first elastic partition and a plurality of battery cells. The battery cells are arranged symmetrically on both sides of the elastic partition in a certain direction. When charging, the elastic partitions are elastically deformed and support the battery cells to ensure that the pole sheets are in close contact.
Through the elastic deformation of the elastic partition, the distance between the battery cells is adaptively adjusted to ensure close contact of the pole plates, which solves the looseness and poor interface problems caused by excessive swelling, and improves the service life and safety performance of the battery.
Smart Images
Figure CN222980560U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of hard shell batteries, and particularly to a battery structure. Background Art
[0002] Currently, the assembly method of hard shell batteries is generally to stack or wind bare battery cells and then install them into the battery housing. During assembly, the shell assembly ratio between the battery cell and the inner cavity of the housing needs to be between 91% and 94%. When the battery cell is in a fully charged state, the shell assembly ratio is generally between 99% and 100%.
[0003] For batteries with special systems, the full charge rebound is particularly large. If designed according to the conventional shell ratio, the battery is prone to bulge in the fully charged state, which will damage the housing and may also cause safety hazards such as liquid leakage. If the shell ratio of the battery is designed to be too small or extremely small, the electrode sheets inside the battery cell are relatively loose, and there is no binding force between the electrode sheets, which is likely to cause problems such as poor electrode sheet interface, increased internal resistance, and reduced cycle life. Utility Model Content
[0004] To solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a battery structure.
[0005] The present disclosure provides a battery structure, including a housing, an enclosed cavity structure is formed inside the housing, and a first elastic partition and a plurality of battery cells are arranged in the cavity structure;
[0006] A plurality of the battery cells are symmetrically arranged on both sides of the first elastic partition along a first direction, and when the battery cells are charged, they can bulge along the first direction, and the first elastic partition can elastically deform along the first direction and elastically support between the battery cells on both sides.
[0007] Optionally, the battery cell is a stacked battery cell, and the stacked battery cells on both sides each include a plurality of first electrode sheets stacked along the first direction, and the first electrode sheets bulge along the first direction when charged.
[0008] Optionally, the battery cell is a wound battery cell, the wound battery cell is formed by winding, and a plurality of second electrode sheets stacked along the first direction are formed inside the wound battery cell, and the second electrode sheets bulge along the first direction when charged.
[0009] Optionally, the shell ratio of a plurality of the battery cells along the first direction is between 30% and 94%.
[0010] Optionally, the number of the battery cells is an even number, the even number of battery cells are arranged on both sides of the first elastic partition and are arranged in one-to-one correspondence.
[0011] Optionally, the number of the battery cells is at least four, and a second elastic partition is disposed between adjacent battery cells on the same side of the first elastic partition, and the second elastic partition can elastically deform along the first direction.
[0012] Optionally, a plurality of the battery cells are pasted on both sides of the first elastic partition.
[0013] Optionally, the battery cell is a sodium ion battery cell, a lithium ion battery cell or a potassium ion battery cell;
[0014] And / or, the housing is a plastic housing, an aluminum housing or a steel housing.
[0015] Optionally, the first elastic partition is an insulating and corrosion-resistant polypropylene plastic partition, a polyester plastic partition, a soft metal partition or a rubber partition.
[0016] Optionally, a plurality of contacts are provided on the housing, and the plurality of contacts include a positive contact and a negative contact. The battery cell has a positive electrode tab and a negative electrode tab, and the positive electrode tab is electrically connected to the positive contact, and the negative electrode tab is electrically connected to the negative contact.
[0017] The technical solution provided by the embodiment of the present disclosure has the following advantages compared with the prior art:
[0018] The battery structure provided by the present disclosure includes a housing. A sealed cavity structure is formed inside the housing. A first elastic partition and a plurality of battery cells are disposed in the cavity structure. The plurality of battery cells are symmetrically arranged on both sides of the first elastic partition along a first direction, and the battery cells can bulge along the first direction during charging. The first elastic partition can elastically deform along the first direction and elastically support between the battery cells on both sides. The elastic forces received by the battery cells on both sides from the first elastic partition are balanced, which can ensure the service life of the battery cells. By adding a first elastic partition with a certain thickness between the battery cells, even when the assembly ratio design of the battery cells is too low, the first elastic partition can also support between the battery cells to fill the internal space of the cavity structure, and the first elastic partition can elastically deform along the first direction, that is, the first elastic partition can adaptively adjust the thickness according to the bulging change during the charge and discharge process of the battery cells, and an elastic force is generated on the deformed first elastic partition. Under the action of the elastic force, the electrode tabs inside the battery cells can ensure close contact, which can solve problems such as looseness inside the battery cell, poor interface or cycling life drop caused by excessive bulging rate of the electrode tabs, so that the battery performance can be stably exerted, thereby improving the electrochemical and safety performance of the hard shell battery; at the same time, the size, strength, processing accuracy, etc. of the first elastic partition can be designed and processed according to actual needs, with high flexibility. Description of the Drawings
[0019] The accompanying drawings here are incorporated into and form a part of this specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.
[0020] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.
[0021] Figure 1 It is a schematic structural diagram of a battery structure according to an embodiment of the present utility model;
[0022] Figure 2 It is a schematic structural diagram of a battery structure according to another embodiment of the present utility model.
[0023] In the figure: 1. Housing; 2. Battery cell; 3. First elastic separator; 4. Second elastic separator; 5. Contact. Detailed implementation manners
[0024] In order to more clearly understand the above objects, features, and advantages of the present disclosure, the following will further describe the solutions of the present disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.
[0025] Many specific details are set forth in the following description to facilitate a full understanding of the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of the present disclosure, rather than all embodiments.
[0026] The following will detail this battery structure through specific embodiments:
[0027] Referring to Figure 1 and Figure 2 As shown, a battery structure provided by some embodiments of the present utility model includes a housing 1. An enclosed cavity structure is formed inside the housing 1. A first elastic separator 3 and a plurality of battery cells 2 are arranged inside the cavity structure. The plurality of battery cells 2 are symmetrically arranged on both sides of the first elastic separator 3 along a first direction (i.e., the direction indicated by the arrow in Figure 1 and Figure 2 ). When the battery cells 2 are charged, they can bulge along the first direction. The first elastic separator 3 can elastically deform along the first direction and elastically support between the battery cells 2 on both sides. The elastic forces exerted on the battery cells 2 on both sides by the first elastic separator 3 are balanced, which can ensure the service life of the battery cells 2.
[0028] In specific implementation, a first elastic separator 3 with a certain thickness is added between the battery cells 2. Even when the assembly ratio of the battery cells 2 is too low, the first elastic separator 3 can support between the battery cells 2 to fill the internal space of the cavity structure. And the first elastic separator 3 can elastically deform along the first direction, that is, the first elastic separator 3 can deform according to the swelling change during the charge and discharge process of the battery cells 2 to adaptively adjust the thickness. And an elastic force is generated on the deformed first elastic separator 3. Under the action of the elastic force, the electrodes between the battery cells 2 can ensure close contact, which can solve problems such as looseness inside the battery cells 2, poor interface, or sudden drop in cycle life caused by excessive swelling rate of the electrodes, enabling the battery performance to be stably exerted, and thus improving the electrochemical and safety performance of the hard shell battery. At the same time, the size, strength, processing accuracy, etc. of the first elastic separator 3 can be designed and processed according to actual needs, with high flexibility.
[0029] In some embodiments, the battery cells 2 are laminated battery cells. The laminated battery cells on both sides each include a plurality of first electrodes laminated along the first direction. When the first electrodes are charged, they bulge along the first direction, and thus the battery cells 2 can bulge along the first direction when charged.
[0030] That is to say, when the first elastic separator 3 elastically deforms, it can provide an elastic force along the first direction to the battery cells 2. Under the action of the elastic force, the plurality of first electrodes laminated along the first direction can be in close contact with each other. Even when the plurality of first electrodes bulge during charging, they can still be in close contact with each other under the action of the elastic force, and thus the battery performance can be ensured.
[0031] In other embodiments, the battery cell is a wound battery cell, which is formed by winding. And a plurality of second electrodes laminated along the first direction are formed inside the wound battery cell. When the second electrodes are charged, they bulge along the first direction. The first elastic separator 3 elastically supports along the first direction between the second electrodes of the battery cells 2 on both sides, and can provide an elastic force for pressing against the second electrodes to the battery cells 2. Through the elastic force, adjacent second electrodes can be in close contact with each other. Even when the plurality of second electrodes bulge during charging, they can still be in close contact with each other under the action of the elastic force.
[0032] It can be understood that both the laminated battery cells and the wound battery cells are formed into battery cells 2 with a square structure. The thickness direction of the battery cells 2 is the first direction, and the first elastic separator 3 can generate an elastic force along the first direction, thereby enabling the electrodes inside the battery cells 2 to ensure close contact.
[0033] In specific implementation, the shell insertion ratio of the plurality of battery cells 2 along the first direction is between 30% and 94%, that is, the ratio of the outer contour size along the first direction of the combination of the plurality of battery cells 2 to the inner diameter along the first direction of the cavity structure is between 30% and 94%.
[0034] Exemplarily, the cross-section of the cavity structure is square, and a plurality of battery cells 2 are stacked along a first direction. The outer contour dimension of the plurality of battery cells 2 combined along the first direction is the total thickness of the plurality of battery cells 2 along the first direction. The ratio of the total thickness of the plurality of battery cells 2 to the thickness of the cavity structure along the first direction is between 30% and 94%.
[0035] Furthermore, after the plurality of battery cells 2 are combined with the first elastic separator 3, the shell insertion ratio can be between 91% and 94%. Moreover, while ensuring tight contact between the plurality of first electrode plates or second electrode plates, it can prevent bulging and damage to the housing 1 in a fully charged state, and also facilitate the shell insertion operation and avoid excessive frictional force during assembly.
[0036] In some embodiments, the number of battery cells 2 is an even number. The even number of battery cells 2 are arranged on both sides of the first elastic separator 3 and are arranged in one-to-one correspondence. It can be understood that the even number of battery cells 2 arranged in one-to-one correspondence on both sides of the first elastic separator 3 can balance the elastic forces exerted on the battery cells 2 on both sides by the first elastic separator 3, thereby ensuring the service life of the battery cells 2.
[0037] Specifically, when implemented, refer to Figure 2 As shown, the number of battery cells 2 is at least four, that is, at least two battery cells 2 are arranged on the same side of the first elastic separator 3. A second elastic separator 4 is arranged between adjacent battery cells 2 on the same side of the first elastic separator 3. The second elastic separator 4 can elastically deform along the first direction to further improve the tightness of contact between the electrode plates inside each battery cell 2.
[0038] Continuing to refer to Figure 2 As shown, the battery cells 2 on the same side of the first elastic separator 3 are stacked in sequence along the first direction. The second elastic separator 4 is arranged between adjacent battery cells 2, that is, the first elastic separator 3, the second elastic separator 4, and the battery cells 2 are stacked along the first direction in different arrangements. Among them, the second elastic separator 4 can elastically deform along the first direction to jointly improve the battery performance in combination with the first elastic separator 3.
[0039] Of course, it should be noted that the battery cells 2, the first elastic separator 3, and the second elastic separator 4 can be arranged according to actual needs, and the present disclosure does not limit this. As long as it can ensure tight contact between the electrode plates inside the battery cells 2, thereby improving the electrochemical and safety performance of the hard-shell battery.
[0040] Specifically, multiple battery cells 2 are adhered to both sides of the first elastic separator 3. It can be understood that after the battery cells 2 and the first elastic separator 3 are adhered, they form an integral structure, which is convenient for the operation of putting them into the shell. Of course, the battery cells 2 can also be connected to the first elastic separator 3 by other connection methods, and the present disclosure does not limit this, which can be specifically set according to actual needs.
[0041] In some embodiments, the battery cells 2 are sodium-ion battery cells or lithium-ion battery cells or potassium-ion battery cells, and the housing 1 is a plastic shell or an aluminum shell or a steel shell, that is, the housing 1 is a rigid housing 1, so that the battery cells 2 have relatively high strength during charge and discharge, and can ensure the battery performance. Of course, the battery cells 2 can also be battery cell structures of other material systems, and the housing 1 can also be other rigid housings. The present disclosure does not limit this, as long as charge and discharge can be achieved and the battery performance can be ensured.
[0042] Furthermore, the first elastic separator 3 is an insulating and corrosion-resistant polypropylene plastic separator or polyester plastic separator or soft metal separator or rubber separator. Specifically, the first elastic separator 3 is resistant to corrosion by organic solvents and electrolytes and has relatively high safety performance. Of course, the first elastic separator 3 can also be a separator made of other materials with reversible elastic deformation. The present disclosure does not limit this, as long as it can be insulated, corrosion-resistant, and can adaptively adjust the thickness to ensure close contact between the electrode sheets inside the battery cells 2 on both sides.
[0043] In some embodiments, a plurality of contacts 5 are provided on the housing 1. The plurality of contacts 5 include positive contacts and negative contacts. The battery cells 2 have positive electrode sheets and negative electrode sheets, and the positive electrode sheets are electrically connected to the positive contacts, and the negative electrode sheets are electrically connected to the negative contacts. Specifically, the contacts 5 on the housing 1 pass through the housing 1 and can achieve electrical connection between the inside and outside of the housing 1, so that the battery cells 2 can supply power to the outside of the housing 1 through the positive contacts and negative contacts to realize the battery function.
[0044] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.
[0045] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1. A battery structure, characterized in that: It comprises a shell (1), wherein a sealed cavity structure is formed inside the shell (1), and a first elastic partition (3) and a plurality of battery cells (2) are arranged in the cavity structure; The plurality of battery cells (2) are symmetrically arranged on both sides of the first elastic partition (3) along a first direction, and the battery cells (2) can swell along the first direction when charged, and the first elastic partition (3) can elastically deform along the first direction and elastically support the battery cells (2) on both sides.
2. The battery structure according to claim 1, characterized in that: The battery core (2) is a laminated battery core, and the laminated battery cores on both sides each comprise a plurality of first pole pieces stacked along the first direction, and the first pole pieces swell along the first direction when charged.
3. The battery structure according to claim 1, characterized in that: The battery cell (2) is a wound battery cell, which is formed by winding, and a plurality of second pole sheets stacked along the first direction are formed inside the wound battery cell, and the second pole sheets swell along the first direction when charged.
4. The battery structure according to claim 1, characterized in that: The shell insertion ratio of the plurality of battery cells (2) along the first direction is between 30% and 94%.
5. The battery structure according to claim 1, characterized in that: The number of the battery cells (2) is an even number, and the even number of the battery cells (2) are arranged on both sides of the first elastic partition (3) and are arranged in a one-to-one correspondence.
6. The battery structure according to claim 5, characterized in that: The number of the battery cells (2) is at least four, and a second elastic partition (4) is provided between adjacent battery cells (2) located on the same side of the first elastic partition (3), and the second elastic partition (4) is capable of elastic deformation along the first direction.
7. The battery structure according to any one of claims 1 to 6, characterized in that: The plurality of battery cells (2) are adhered to both sides of the first elastic partition (3).
8. The battery structure according to any one of claims 1 to 6, characterized in that: The battery cell (2) is a sodium ion battery cell, a lithium ion battery cell, or a potassium ion battery cell; And / or, the housing (1) is a plastic housing, an aluminum housing, or a steel housing.
9. The battery structure according to any one of claims 1 to 6, characterized in that: The first elastic partition (3) is an insulating and corrosion-resistant polypropylene plastic partition or polyester plastic partition or a soft metal partition or a rubber partition.
10. The battery structure according to any one of claims 1 to 6, characterized in that: The shell (1) is provided with a plurality of contacts (5), the plurality of contacts (5) comprising a positive electrode contact and a negative electrode contact, the battery cell (2) having a positive electrode sheet and a negative electrode sheet, the positive electrode sheet being electrically connected to the positive electrode contact, and the negative electrode sheet being electrically connected to the negative electrode contact.