Battery cell connection structure and battery pack
Through the design of the battery cell connection structure, the combination of insulating plate and conductive columns is used to realize the transverse connection of the battery cell, solving the problem that the battery cell cannot be connected to the head to tail, and improving the heat dissipation efficiency and structural stability.
Patent Information
- Application Number
- CN202422131694.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-02
AI Technical Summary
In the prior art, the battery cells can only be placed vertically, and head-to-tail connection cannot be achieved, affecting the battery thermal management effect.
The battery core connection structure is adopted, including a first insulating plate, a second insulating plate, a conductive column, a third conductive plate and an elastic member. The electrical connection of the battery core electrode column is achieved through the connection between the conductive column and the insulating plate, avoiding welding and allowing the battery core to be cross-placed.
The transverse connection of the battery cell is realized, the heat dissipation efficiency and structural stability are improved, the risk of short circuit is avoided, and the heat dissipation effect of the battery cell is enhanced.
Smart Images
Figure CN223124126U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of power batteries, and particularly to a cell connection structure and a battery pack. Background Art
[0002] The cell structure in a power battery system determines the design principles and assembly principles of the battery system. Currently, cells generally adopt the method of having pole columns at both ends or on the same side, and the presence of the pole columns will affect the welding of the busbars. Currently, in order to achieve the connection between cells, people usually use aluminum bar structural parts to weld with the pole columns of two cells. However, limited by the welding equipment, the cell pole columns can only face outward and cannot be blocked, that is, the cells can only be connected in a vertically placed manner, so it is impossible to achieve the head-to-tail connection of the cells, and thus the cells cannot be placed "lying down", affecting the battery thermal management effect. Summary of the Utility Model
[0003] This application discloses a cell connection structure and a battery pack. By connecting the cell connection structure to the positive pole column and the negative pole column of adjacent cells respectively, it is beneficial to achieve the connection between cells, and it is expected to achieve the horizontal placement of the cells, thereby being beneficial to improving the heat dissipation effect.
[0004] To achieve the above object, this application provides the following technical solutions:
[0005] In a first aspect, this application provides a cell connection structure for connecting the pole columns of two adjacent cells, including a first insulating plate, a second insulating plate, a conductive column, a third conductive plate, and an elastic member;
[0006] The first insulating plate is provided with a first through hole, the second insulating plate is provided with a second through hole, the third conductive plate is fixedly arranged on the side of the second insulating plate away from the first insulating plate and is located at the opening of the second through hole; one end of the conductive column penetrates through the first through hole and is fixedly connected to the first insulating plate, and the other end is inserted into the second through hole and is slidably connected to the third conductive plate;
[0007] The elastic member is sleeved outside the conductive column, one end of the elastic member is connected to the first insulating plate, and the other end is connected to the second insulating plate, and is used to provide a force for the second insulating plate to move away from the first insulating plate.
[0008] The above-mentioned battery cell connection structure realizes the electrical connection of adjacent battery cell poles by setting a first insulating plate, a second insulating plate, an elastic member, and a conductive column and a third conductive plate with a conductive function. The pole connection method of the present application does not require welding, and is expected to realize the horizontal placement of the battery cell, which is beneficial to improving the heat dissipation efficiency of the battery cell. Specifically, one end of the conductive column of the battery cell connection structure of the present application passes through the first through hole and is fixedly connected to the first insulating plate, and the other end is inserted into the second through hole and is slidably connected to the third conductive plate. The relative positions of the conductive column and the third conductive plate are adjusted by the elastic member arranged between the first insulating plate and the second insulating plate, so that when the battery cell connection structure is used to connect adjacent battery cells, the conductive column and the third conductive plate are fully in contact with the battery cell poles to achieve good conductive effect. In addition, the first insulating plate and the second insulating plate are conducive to avoiding direct contact between the top covers of adjacent battery cells and the occurrence of short circuits.
[0009] In some embodiments, the conductive column includes an inserting portion, the inserting portion is disposed on a side of the conductive column away from the first insulating plate, and the inserting portion is slidably connected to the third conductive plate.
[0010] In some embodiments, the battery cell connection structure further includes an insulating sleeve, which is disposed outside the conductive column and between the conductive column and the elastic member, and one end of the insulating sleeve is inserted into the first through hole, and the other end is inserted into the second through hole.
[0011] In some embodiments, the first insulating plate, the second insulating plate and the insulating sleeve are made of plastic.
[0012] In some embodiments, the conductive pillar and the third conductive plate are made of metal.
[0013] In some embodiments, the elastic member is a spring.
[0014] In a second aspect, the present application provides a battery pack, comprising at least one layer of battery cell assemblies, each layer of the battery cell assemblies comprising at least one row of battery cell chains, each row of the battery cell chain comprising at least two battery cells, and any two adjacent battery cells being electrically connected by the battery cell connection structure as described in the first aspect;
[0015] In any row of the battery cell chain, the arrangement direction of the at least two battery cells is perpendicular to the thickness direction of the battery cells.
[0016] In some embodiments, the battery cell includes a positive electrode post and a negative electrode post disposed opposite to each other along its width direction. Among any two adjacent battery cells, the first insulating plate of the battery cell connection structure is in contact connection with one of the battery cells, the second insulating plate of the battery cell connection structure is in contact connection with the other battery cell, and the conductive post of the battery cell connection structure is electrically connected to the positive electrode post or the negative electrode post of one of the battery cells, and the third conductive plate of the battery cell connection structure is electrically connected to the negative electrode post or the positive electrode post of the other battery cell.
[0017] In some embodiments, when the battery cell assembly includes multiple rows of battery cell chains, the battery pack further includes a bus bar;
[0018] Among any two adjacent rows of the battery cell chains, one end of the bus bar is connected to one battery cell in one row of the battery cell chains, and the other end is connected to one battery cell in the other row of the battery cell chains.
[0019] In some embodiments, the battery pack further includes a liquid cooling plate;
[0020] When the battery pack includes one layer of the battery cell assembly, the liquid cooling plate is in contact connection with the battery cell assembly;
[0021] When the battery pack includes multiple layers of the battery cell assembly, the liquid cooling plate is disposed between any two adjacent layers of the battery cell assemblies and is in contact connection with both layers of the battery cell assemblies. Description of the Drawings
[0022] Figure 1 It is a schematic structural diagram of a battery cell connection structure provided by an embodiment of the present application;
[0023] Figure 2 It is a three-dimensional structural diagram of a battery cell connection structure provided by an embodiment of the present application;
[0024] Figure 3 It is a side view structural diagram of a battery cell connection structure provided by an embodiment of the present application;
[0025] Figure 4 It is a front view structural diagram of a battery cell connection structure provided by an embodiment of the present application;
[0026] Figure 5 It is a top view structural diagram of a battery cell connection structure provided by an embodiment of the present application;
[0027] Figure 6 It is a schematic structural diagram of a battery cell assembly provided by an embodiment of the present application;
[0028] Figure 7 It is a schematic structural diagram of a battery pack provided by an embodiment of the present application;
[0029] Figure 8Schematic diagram of the structure of a battery pack provided by an embodiment of the present application;
[0030] Icon: 1. First insulating plate; 2. Second insulating plate; 3. Conductive column; 4. Third conductive plate; 5. Elastic member; A. First through hole; B. Second through hole; 6. Insertion part; 7. Insulating sleeve; 10. Battery cell assembly; 11. Battery cell chain; 12. Battery cell; 13. Busbar; 14. Liquid cooling plate. Detailed implementation manners
[0031] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application. Among them, in the description of the embodiments of the present application, unless otherwise specified, " / " means "or". For example, A / B may mean A or B; the "and / or" in the text is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B may mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality of" means two or more than two.
[0032] Among them, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0033] In the first aspect, as Figures 1 - 5 shown, the present application provides a battery cell connection structure for connecting the pole columns of two adjacent battery cells, including a first insulating plate 1, a second insulating plate 2, a conductive column 3, a third conductive plate 4, and an elastic member 5;
[0034] The first insulating plate 1 is provided with a first through hole A, the second insulating plate 2 is provided with a second through hole B, the third conductive plate 4 is fixedly arranged on the side of the second insulating plate 2 away from the first insulating plate 1 and is located at the opening of the second through hole B; one end of the conductive column 3 penetrates through the first through hole A and is fixedly connected to the first insulating plate 1, and the other end is inserted into the second through hole B and is slidably connected to the third conductive plate 4;
[0035] The elastic member 5 is sleeved outside the conductive column 3. One end of the elastic member 5 is connected to the first insulating plate 1, and the other end is connected to the second insulating plate 2, and is used to provide a force for the second insulating plate 2 to move away from the first insulating plate 1.
[0036] The above-mentioned cell connection structure can realize the electrical connection of adjacent cell poles by providing the first insulating plate 1, the second insulating plate 2, the elastic member 5, the conductive column 3 and the third conductive plate 4 with a conductive function, and the pole connection method of the present application does not require welding, and is expected to realize the horizontal placement of the cell, which is beneficial to improving the heat dissipation efficiency of the cell. Specifically, Figure 1 As shown, one end of the conductive column 3 of the cell connection structure of the present application passes through the first through hole A and is fixedly connected to the first insulating plate 1, and the other end is inserted into the second through hole B and slidably connected to the third conductive plate 4, and the relative positions of the conductive column 3 and the third conductive plate 4 are adjusted by the elastic member 5 disposed between the first insulating plate 1 and the second insulating plate 2, so that when the cell connection structure is used to connect adjacent cells, the conductive column 3 and the third conductive plate 4 are fully in contact with the cell pole to achieve a good conductive effect. In addition, the first insulating plate 1 and the second insulating plate 2 are conducive to avoiding the direct contact of the top covers of adjacent cells and the occurrence of a short circuit, and the elastic member 5 can be fixedly connected to the first insulating plate 1 and the second insulating plate 2 to improve the structural stability of the cell connection structure. It should be noted that the end of the conductive column 3 close to the first insulating plate 1 needs to partially protrude from the first through hole A to achieve the electrical connection between the conductive column 3 and the pole. The third conductive plate 4 can also be arranged inside the second through hole B, and partially protrude from the second through hole B to achieve the electrical connection between the third conductive plate 4 and the pole.
[0037] In some embodiments, the conductive column 3 includes an inserting portion 6 , which is disposed on a side of the conductive column 3 away from the first insulating plate 1 , and the inserting portion 6 is slidably connected to the third conductive plate 4 .
[0038] One possible way to achieve this is as follows: Figure 1 As shown, the plug-in portion 6 of the conductive column 3 is partially inserted into the third conductive plate 4 and is slidably connected to the third conductive plate 4. When the elastic member 5 between the first insulating plate 1 and the second insulating plate 2 contracts or stretches, the first insulating plate 1 and the second insulating plate 2 are squeezed by the elastic member 5, and the distance between them will change, so that the plug-in portion 6 will also adjust the length of the insertion into the third conductive plate 4 accordingly, so that the conductive column 3 and the third conductive plate 4 can fully contact with the battery cell pole to play the role of conducting electrons.
[0039] In some embodiments, the battery cell connection structure further includes an insulating sleeve 7, which is sleeved on the outside of the conductive column 3 and located between the conductive column 3 and the elastic member 5, with one end of the insulating sleeve 7 inserted into the first through hole A and the other end inserted into the second through hole B.
[0040] One possible implementation method is Figure 3As shown, an insulating sleeve 7 is also sleeved outside the conductive post 3. The two ends of the insulating sleeve 7 are respectively inserted into the first through-hole A of the first insulating plate 1 and the second through-hole B of the second insulating plate 2. The setting of the insulating sleeve 7 can, on the one hand, prevent metal debris from short-circuiting with the conductive post 3, and on the other hand, prevent the conductive post 3 from detaching from the first through-hole A of the first insulating plate 1 and the second through-hole B of the second insulating plate 2, playing a role in fixing the position of the conductive post 3.
[0041] In some embodiments, the materials of the first insulating plate 1, the second insulating plate 2, and the insulating sleeve 7 are plastics. For example, the first insulating plate 1, the second insulating plate 2, and the insulating sleeve 7 can all be made of polytetrafluoroethylene. It can be understood that the first insulating plate 1, the second insulating plate 2, and the insulating sleeve 7 can also be other insulating materials, and no specific limitation is made.
[0042] In some embodiments, the materials of the conductive post 3 and the third conductive plate 4 are metals. For example, the conductive post 3 and the third conductive plate 4 can both be made of copper or aluminum. It can be understood that the conductive post 3 and the third conductive plate 4 can also be other metal materials, and no specific limitation is made.
[0043] In some embodiments, the elastic member 5 is a spring. It can be understood that the elastic member 5 can also be other elastic elements such as a rubber pad, and no specific limitation is made.
[0044] In a second aspect, as Figures 6 - 8 shown, the present application provides a battery pack, including at least one layer of battery cell assemblies 10. Each layer of battery cell assemblies 10 includes at least one row of battery cell chains 11. Each row of battery cell chains 11 includes at least two battery cells 12. Any two adjacent battery cells 12 are electrically connected through the battery cell connection structure in the first aspect;
[0045] In any row of battery cell chains 11, the arrangement directions of at least two battery cells 12 are perpendicular to the thickness direction of the battery cells 12.
[0046] In a possible implementation manner, as Figure 6 shown, one layer of battery cell assemblies 10 includes 4 rows of battery cell chains 11. Each row of battery cell chains 11 includes 6 battery cells 12. The 6 battery cells 12 are sequentially connected end to end through the battery cell connection structure, that is, in series connection. The battery cells 12 in the present application adopt a horizontal connection method, which is beneficial to increasing the heat dissipation area of the battery cells 12 and improving the heat dissipation effect. It should be noted that the number of layers of battery cell assemblies 10, the number of rows of battery cell chains 11 in each layer of battery cell assemblies 10, and the number of battery cells 12 in each row of battery cell chains 11 in the battery pack in the embodiments of the present application can be set according to actual application situations, and no specific limitations are made on the quantities.
[0047] In some embodiments, the battery cell 12 includes a positive electrode post and a negative electrode post disposed opposite to each other in its width direction. Among any two adjacent battery cells 12, the first insulating plate 1 of the battery cell connection structure is in contact connection with one battery cell 12, the second insulating plate 2 of the battery cell connection structure is in contact connection with the other battery cell 12, the conductive post 3 of the battery cell connection structure is electrically connected to the positive electrode post or the negative electrode post of one battery cell 12, and the third conductive plate 4 of the battery cell connection structure is electrically connected to the negative electrode post or the positive electrode post of the other battery cell 12.
[0048] In a possible implementation manner, as Figure 6 shown, the battery cell 12 of the embodiment of the present application has a structure with electrode posts protruding from both ends in its width direction. The electrode posts of any two adjacent battery cells 12 can be electrically connected through the battery cell connection structure, without the need for welding between the electrode posts, realizing the horizontal placement of the battery cells 12, achieving the head-to-tail connection between different battery cells 12, and being beneficial to improving the heat dissipation effect of the battery cells 12.
[0049] In some embodiments, when the battery cell assembly 10 includes multiple rows of battery cell chains 11, the battery pack further includes a bus bar 13;
[0050] Among any two adjacent rows of battery cell chains 11, one end of the bus bar 13 is connected to one battery cell 12 in one row of battery cell chains 11, and the other end is connected to one battery cell 12 in the other row of battery cell chains 11.
[0051] In a possible implementation manner, as Figure 6 and Figure 7 shown, in order to realize the series connection between different battery cell chains 11, the present application further provides a bus bar 13. In the same layer of battery cell assembly 10, one end of the bus bar 13 is connected to the electrode post of one battery cell 12 in one row of battery cell chains 11, and the other end is connected to the electrode post of one battery cell 12 in the other row of battery cell chains 11.
[0052] In some embodiments, the battery pack further includes a liquid cooling plate 14;
[0053] When the battery pack includes one layer of battery cell assembly 10, the liquid cooling plate 14 is in contact connection with the battery cell assembly 10;
[0054] When the battery pack includes multiple layers of battery cell assemblies 10, the liquid cooling plate 14 is disposed between any two adjacent layers of battery cell assemblies 10 and is in contact connection with both layers of battery cell assemblies 10.
[0055] In a possible implementation manner, when the battery pack only includes one layer of battery cell assembly 10, the liquid cooling plate 14 is disposed on one surface of the layer of battery cell assembly 10 perpendicular to the thickness direction, so that all the battery cells 12 in the battery cell assembly 10 are in contact with the liquid cooling plate 14, increasing the direct contact area between the battery cells 12 and the liquid cooling plate 14, and being beneficial to improving the cooling efficiency of the battery cell assembly 10.
[0056] In another possible implementation, as Figure 8 shown, when the battery pack includes multiple layers of battery cell assemblies 10, the liquid cooling plate 14 is disposed between any two adjacent layers of battery cell assemblies 10, so that each layer of battery cell assembly 10 can directly contact the liquid cooling plate 14, thereby improving the heat dissipation effect and cooling efficiency. That is to say, after the battery cells 12 are arranged horizontally, the number of liquid cooling plates 14 is increased, and the liquid cooling effect of the battery cell assemblies 10 is improved.
[0057] Obviously, those skilled in the art can make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these changes and modifications.
Claims
1. A cell connection structure for connecting the pole columns of two adjacent cells, characterized in that, It includes a first insulating plate, a second insulating plate, a conductive column, a third conductive plate and an elastic member; The first insulating plate is provided with a first through hole, the second insulating plate is provided with a second through hole, and the third conductive plate is fixedly arranged on a side of the second insulating plate away from the first insulating plate and located at the opening of the second through hole; one end of the conductive column passes through the first through hole and is fixedly connected to the first insulating plate, and the other end is inserted into the second through hole and is slidably connected to the third conductive plate; The elastic member is sleeved outside the conductive column, one end of the elastic member is connected to the first insulating plate, and the other end is connected to the second insulating plate, so as to provide a force for the second insulating plate to move away from the first insulating plate.
2. The cell connection structure according to claim 1, characterized in that, The conductive column comprises an inserting portion, the inserting portion is arranged on a side of the conductive column away from the first insulating plate, and the inserting portion is slidably connected to the third conductive plate.
3. The battery cell connection structure according to claim 2, wherein, The battery cell connection structure also includes an insulating sleeve, which is disposed outside the conductive column and between the conductive column and the elastic member. One end of the insulating sleeve is inserted into the first through hole, and the other end is inserted into the second through hole.
4. The cell connection structure according to claim 3, characterized in that, The first insulating plate, the second insulating plate and the insulating sleeve are made of plastic.
5. The cell connection structure according to claim 4, characterized in that, The conductive pillar and the third conductive plate are made of metal.
6. The cell connection structure according to claim 1, characterized in that, The elastic member is a spring.
7. A battery pack, characterized in that, The method comprises at least one layer of battery cell assemblies, each layer of the battery cell assemblies comprises at least one row of battery cell chains, each row of the battery cell chains comprises at least two battery cells, and any two adjacent battery cells are electrically connected by the battery cell connection structure according to any one of claims 1 to 6; In any row of the battery cell chain, the arrangement direction of the at least two battery cells is perpendicular to the thickness direction of the battery cells.
8. The battery pack according to claim 7, characterized in that, The battery cell includes a positive electrode column and a negative electrode column arranged opposite to each other along the width direction thereof. In any two adjacent battery cells, the first insulating plate of the battery cell connection structure is in contact with and connected to one of the battery cells, the second insulating plate of the battery cell connection structure is in contact with and connected to the other battery cell, and the conductive column of the battery cell connection structure is electrically connected to the positive electrode column or the negative electrode column of one of the battery cells, and the third conductive plate of the battery cell connection structure is electrically connected to the negative electrode column or the positive electrode column of the other battery cell.
9. The battery pack according to claim 8, characterized in that, When the battery cell assembly includes multiple rows of battery cell chains, the battery pack further includes a busbar; In any two adjacent rows of the battery cell chains, one end of the busbar is connected to a battery cell in one row of the battery cell chain, and the other end is connected to a battery cell in the other row of the battery cell chain.
10. The battery pack according to claim 9, characterized in that, The battery pack also includes a liquid cooling plate; When the battery pack includes a layer of the battery cell assembly, the liquid cooling plate is in contact with and connected to the battery cell assembly; When the battery pack includes multiple layers of the battery cell assemblies, the liquid cooling plate is disposed between any two adjacent layers of the battery cell assemblies and is in contact and connection with both layers of the battery cell assemblies.