Battery connection structure, battery, battery pack and battery pack
By using elastic conductive parts in the battery connection structure, the pole ears of the battery cell are kept in contact with the shell to achieve electrical connection, which solves the problems of many welding processes and cumbersome assembly in the existing battery assembly process, simplifies the assembly process and reduces the welding complexity.
Patent Information
- Application Number
- CN202421798927.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-05-23
- Estimated Expiration
- 2034-07-26
AI Technical Summary
There are many welding processes and cumbersome assembly during the existing battery assembly process. The series connection between batteries in the battery pack needs to be through welding pads, which increases complexity and time-consuming.
A battery connection structure is adopted, including a cover plate, a pole, an elastic conductive part and a connecting piece. By setting the elastic conductive part, the pole ear of the battery cell is kept in contact with the shell to achieve electrical connection without welding connection.
The welding process is reduced, the assembly process is simplified, and the series connection between batteries is achieved through direct contact, reducing welding complexity and time-consuming.
Smart Images
Figure CN222896796U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery connection structure, a battery, a battery pack and a battery package. Background Art
[0002] In the prior art, a battery generally includes a positive electrode post, a negative electrode post and a battery cell. The battery cell includes a positive electrode tab and a negative electrode tab. In order to achieve a conductive connection between the tab and the electrode post, the positive electrode tab and the negative electrode tab of the battery cell are respectively welded to the positive electrode adapter plate and the negative electrode adapter plate. The positive electrode adapter plate and the negative electrode adapter plate are then respectively welded to the positive electrode post and the negative electrode post. There are many welding steps and the assembly process is cumbersome.
[0003] In addition, with the development of technology in the field of new energy, the requirements for the capacity of battery packs are getting higher and higher. A battery pack usually includes multiple battery groups, which are formed by connecting more batteries in series to provide a larger capacity. The battery pack can be a battery column that does not include a module frame (such as an end plate, a side plate, etc.), and the battery column is directly fixed in the box of the battery pack. The battery pack can also be a battery module including a module frame. After multiple batteries are fixed to form a battery module, the battery module is fixed in the box of the battery pack. In order to realize the series connection of batteries, the bar sheet and the battery pole are usually welded to realize the electrical connection between the batteries. There are also many welding steps and the assembly process is cumbersome. Of course, in addition to series connection, the batteries in the battery pack can also be further connected in parallel. Utility Model Content
[0004] Based on this, it is necessary to provide a battery connection structure, a battery, a battery pack and a battery pack to address the problems of multiple welding steps and complicated assembly during the assembly of batteries and battery packs.
[0005] In a first aspect, the present application provides a battery connection structure, which adopts the following technical solution:
[0006] A battery connection structure, comprising:
[0007] A cover plate, used for connecting with the shell;
[0008] A pole, the pole is passed through the cover plate;
[0009] An elastic conductive part, the elastic conductive part has a first end and a second end arranged opposite to each other, and the first end is connected to the pole;
[0010] A connecting piece, the connecting piece having a first surface and a second surface arranged opposite to each other, the first surface being connected to the second end of the elastic conductive portion;
[0011] The battery cell has pole ears with different polarities arranged on two opposite sides of the battery cell, the pole ear on one side of the battery cell is connected to the second side of the connecting piece, and the pole ear on the other side of the battery cell is used to contact and electrically connect with the shell.
[0012] In one of the embodiments, the tabs of the battery cell in the provided battery connection structure are full tabs.
[0013] In one embodiment, the shell in the provided battery connection structure is a square shell, and along the length direction of the battery, multiple battery cells are arranged to form a battery cell group, and the connecting sheet is welded to all the battery cells in the battery cell group by a first weld.
[0014] In one of the embodiments, the elastic conductive part in the provided battery connection structure is welded to the connecting piece to form a second weld mark, and the second weld mark is staggered with the first weld mark.
[0015] In one embodiment, the second weld marks in the provided battery connection structure are distributed on the central axis of the connection sheet along the width direction.
[0016] In one embodiment, the battery cell in the provided battery connection structure is a cylindrical winding core.
[0017] In one embodiment, the elastic conductive portion in the provided battery connection structure has an S-shape or a spiral shape.
[0018] In a second aspect, the present application provides a battery, including the battery connection structure as described in the first aspect, and the battery further includes:
[0019] The shell has an opening on a first side, and the cover plate is connected to the shell to seal the opening; the pole ear on the other side of the battery cell is in contact and electrically connected with the second side of the shell, and the second side is arranged opposite to the first side.
[0020] In a third aspect, the present application provides a battery pack, comprising a plurality of batteries as in the second aspect, wherein the plurality of batteries are arranged in sequence along their height direction, and among two adjacent batteries, a pole of one battery is in contact with and electrically connected to a shell of another battery.
[0021] In a fourth aspect, the present application provides a battery pack, comprising the battery pack as described in the third aspect.
[0022] The battery connection structure, battery, battery pack and battery pack, wherein the battery connection structure includes: a cover plate, which is used to connect with the shell; a pole, which is inserted into the cover plate; an elastic conductive part, which has a first end and a second end arranged oppositely, and the first end is connected to the pole; a connecting piece, which has a first face and a second face arranged oppositely, and the first face is connected to the second end of the elastic conductive part; a battery cell, wherein the opposite sides of the battery cell are provided with pole ears with different polarities, the pole ear on one side of the battery cell is connected to the second face of the connecting piece, and the pole ear on the other side of the battery cell is used to contact and electrically connect with the shell. In the present application, by setting the elastic conductive part, a certain elastic force can be applied to the battery cell, so that the pole ear on the other side of the battery cell is kept in contact with the shell to achieve electrical connection, without the need for welding connection, thereby reducing the welding process and simplifying the assembly process. In addition, since one pole ear of the battery cell is connected to the shell, when assembling multiple batteries into a battery pack, the pole of one battery cell can be directly contacted with the shell of another battery cell to achieve the series connection between the two batteries, without the need to achieve it through welding the bar sheet, which can further reduce the welding process and simplify the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 This is a schematic structural diagram of a battery connection structure in one embodiment;
[0024] Figure 2 is a schematic diagram of the structure of a battery cell in an embodiment;
[0025] Figure 3 This is a schematic diagram of the structure of the connecting sheet and each battery cell in an embodiment;
[0026] Figure 4 is a schematic structural diagram of an elastic conductive portion and a connecting sheet in one embodiment;
[0027] Figure 5 This is a schematic diagram of the structure of batteries connected in series in one embodiment;
[0028] Notes on the attached drawings:
[0029] 10. Battery; 11. Battery connection structure; 111. Cover plate; 112. Post; 1121. Contact portion; 1122. Embedded portion; 113. Elastic conductive portion; 114. Connecting piece; 115. Battery core; 1151. Positive electrode tab; 1152. Negative electrode tab; 116. First weld mark; 117. Second weld mark; 12. Shell; 13. Lower plastic part; 14. Seal; 15. Liquid injection hole; 16. Explosion-proof valve; 20. First battery; 30. Second battery; 40. Third battery. DETAILED DESCRIPTION
[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.
[0034] In this application, unless otherwise clearly specified and defined, if there is a description such as a first feature being "on" or "under" a second feature, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature.
[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.
[0036] The following will Figure 1-5 further describe the embodiments of this application in detail.
[0037] Figure 1 The structural schematic diagram of the battery connection structure in an embodiment of this application is shown. Refer to Figure 1 A battery connection structure provided by an embodiment of this application includes a cover plate 111 for connecting to a housing 12; a pole 112 passing through the cover plate 111; an elastic conductive part 113 having a first end and a second end arranged opposite to each other, and the first end of the elastic conductive part 113 is connected to the pole; a connection piece 114 having a first surface and a second surface arranged opposite to each other, and the first surface of the connection piece 114 is connected to the second end of the elastic conductive part 113; a battery cell 115 having pole tabs with different polarities arranged on opposite sides thereof, one pole tab on one side of the battery cell 115 is connected to the second surface of the connection piece 114, and the pole tab on the other side of the battery cell 115 is used to make electrical contact with the housing 12.
[0038] In this embodiment, by providing the elastic conductive part 113, a certain elastic force can be applied to the battery cell 115, so that the pole tab on the other side of the battery cell 115 remains in contact with the housing 12 to achieve electrical connection, without the need for welding connection, thereby reducing the welding process and simplifying the assembly process.
[0039] The following description will be made by taking the example that the positive electrode tab 1151 is connected to the second side of the connecting sheet 114 and the negative electrode tab 1152 is in contact with the shell. In other embodiments, the negative electrode tab 1152 may be connected to the second side of the connecting sheet 114 and the positive electrode tab 1151 may be in contact with the shell. In the present application, the polarity of the tabs on both sides is not limited.
[0040] Figure 2 A schematic diagram of the structure of a battery cell in one embodiment of the present application is shown. The tabs of the battery cell provided in one embodiment of the present application, i.e., the positive tab 1151 and the negative tab 1152, are both full-tab structures. The use of a full-tab structure can enhance the overall strength of the tabs, and avoid excessive bending of the tabs under the elastic force of the elastic conductive portion 113, which affects the battery performance. Specifically, the positive tab 1151 / negative tab 1152 is an aggregate formed by superimposing the empty foil area of the current collector extending from the positive electrode sheet / negative electrode sheet as a whole, and the empty foil area of the current collector is not die-cut. Typically, the positive current collector is aluminum foil, and the negative current collector is copper foil. Such a design can provide a larger electrode area in a limited space, thereby improving the energy density of the battery.
[0041] Optionally, the battery cell 115 is a cylindrical winding core, that is, a cylindrical structure formed by winding the positive electrode sheet, the negative electrode sheet and the separator. The tabs of the cylindrical winding core are shorter and can be kneaded into a whole by ultrasonic flattening, and the shorter tabs can also reduce the risk of excessive bending.
[0042] Optionally, the battery cell 115 is coated with a Mylar film, which is an insulating material and can provide electrical insulation, thermal stability and mechanical protection for the battery cell 115 .
[0043] Figure 3 The schematic diagram of the structure of the connecting sheet and each battery cell in an embodiment of the present application is shown. Optionally, the housing 12 is a square housing, and along the length direction of the battery 10 (i.e. Figure 3 In the left and right directions in FIG. 1 ), a plurality of battery cells 115 are arranged to form a battery cell group, and the connecting sheet 114 is welded to all the battery cells in the battery cell group through the first welding stamp 116. The number of the first welding stamps 116 is not limited in this embodiment, and preferably, more than two first welding stamps 116 may be provided, thereby increasing the welding strength between the positive electrode tab 1151 and the connecting sheet 114.
[0044] In this embodiment, the welding method of forming the first weld mark 116 can quickly and evenly weld the positive electrode ear 1151 of each battery cell 115 in the battery cell group to the second side of the connecting piece 114; by performing through-welding on each battery cell group, it is avoided that each battery cell 115 is welded separately in the prior art, resulting in high welding energy consumption, long welding time and high welding error rate.
[0045] For details, see Figure 3 , the first weld mark 116 can be a straight bar weld mark, or a curved weld mark in other embodiments; and the welding method between the positive electrode tab 1151 and the connecting piece 114 can be laser welding, or resistance welding, electron beam welding, or arc welding. The material of the connecting piece 114 can be aluminum, aluminum alloy, nickel alloy, or other metals, and the width W0 of the connecting piece 114 can be less than or equal to the arrangement width W1 of the battery cell group; the width W0 of the connecting piece 114 can also be greater than the arrangement width W1 of the battery cell group, as long as the effective connection between the battery cell group and the connecting piece 114 and the overcurrent capacity are achieved.
[0046] Figure 4 FIG. 1 shows a schematic diagram of the structure of the elastic conductive portion 113 and the connecting piece 114 in an embodiment of the present application. Figure 3 and Figure 4 The elastic conductive part 113 and the connecting piece 114 are welded to form a second weld mark 117, and the second weld mark 117 is staggered with the first weld mark 116, that is, the positions of the first weld mark and the second weld mark on the adapter sheet do not overlap, thereby avoiding mutual interference between the two welding processes.
[0047] Optionally, the second weld marks are distributed on the central axis of the connecting piece along the width direction, so that the elastic force applied by the elastic conductive part 113 can be more evenly dispersed through the connecting piece 114 .
[0048] Optionally, the elastic conductive portion 113 is in an S shape or a spiral shape. The number of the elastic conductive portions 113 is related to the number of the battery cells 115. The more battery cells 115 there are in the battery 10, the heavier the overall weight of the battery 10 is, and the more elastic conductive portions 113 are required. The number of the elastic conductive portions 113 is not limited here and is set according to actual needs.
[0049] Optionally, the material of the elastic conductive part 113 may be aluminum, aluminum alloy, nickel alloy or stainless steel. The welding method between the elastic conductive part 113 and the connecting piece 114 may be laser welding.
[0050] Continue reading Figure 1The pole 112 in the battery connection structure provided in one embodiment of the present application includes a contact portion 1121 and an embedded portion 1122 connected to each other, and the embedded portion 1122 is welded to the elastic conductive portion 113, so as to realize electrical connection with the positive pole ear 1151 of each battery cell 115 in the battery 10 through the elastic conductive portion 113 and the connecting sheet 114, and the contact portion 1121 is used for electrical connection with the outside. In this embodiment, it is preferred to pass the pole 112 through the middle position of the cover plate 111, so that the elastic conductive portion 113 connected to the pole 112 is located in the middle position of the battery, so that the elastic force applied by the elastic conductive portion 113 to the battery cell 115 is relatively uniform.
[0051] Continue reading Figure 1 , the battery connection structure provided in one embodiment of the present application further includes a lower plastic part 13, a sealing part 14, a liquid injection hole 15 and an explosion-proof valve 16. The lower plastic part 13 is arranged on the side of the cover plate 111 close to the battery cell 115, and is used to insulate the battery cell 115 from the cover plate 111; the sealing part 14 is arranged between the pole 112 and the cover plate 111, and is used to ensure the sealing of the battery, prevent electrolyte leakage and external air from entering, and improve the safety of the battery. The liquid injection hole 15 is penetrated through the cover plate 111, and is used as an opening for injecting electrolyte into the battery; the explosion-proof valve 16 is penetrated through the cover plate 111, and is used to release pressure when the internal pressure of the battery is too high, so as to prevent the battery from exploding or rupturing. These are all conventional designs in the art and will not be described in detail here.
[0052] In one embodiment of the present application, a battery is provided. The battery includes the battery connection structure provided in the above embodiment, and the battery also includes:
[0053] The shell 12 has an opening on its first side, and the cover plate 111 is connected to the shell 12 to seal the opening; the tab on the other side of the battery cell 115 is in contact and electrically connected to the second side of the shell 12, and the second side is arranged opposite to the first side.
[0054] In a possible implementation, the positive electrode tab 1151 of the battery cell 115 is welded to the connecting piece 114 ; and the negative electrode tab 1152 of the battery cell 115 is connected to the second side of the shell 12 .
[0055] Among them, the first side of the shell 12 is connected to a battery connection structure, and the pole 112 in the battery connection structure is connected to the positive pole tab 1151 of the battery cell 115 through the elastic conductive part 113 and the connecting piece 114, and the pole 112 carries a positive voltage. The elastic conductive part 113 in the battery connection structure can provide elastic force to each battery cell 115 in the battery through the connecting piece 114, so as to press the negative pole tab 1152 of the battery cell 115 to the second side of the shell 12, that is, to achieve electrical connection between the negative pole tab 1152 of the battery cell 115 and the second side of the shell 12, so that the shell 12 carries a negative voltage. In this embodiment, the negative pole tab 1152 of the battery cell 115 is tightly attached to the second side of the shell 12 through the elastic force provided by the elastic conductive part 113, and a stable electrical connection can be achieved without welding, thereby simplifying the battery production and manufacturing process and reducing the complexity of battery assembly.
[0056] Optionally, the cover plate 111 in the battery connection structure is welded to the opening on the first side of the shell 12 .
[0057] Optionally, the shell 12 is made of metal such as aluminum, aluminum alloy or steel.
[0058] In a possible implementation, the battery assembly sequence includes:
[0059] Step 1, covering the battery cell 115 with a Mylar film;
[0060] Step 2, welding the connecting piece 114 and the battery cell 115;
[0061] Step 3, welding the connecting piece 114 and the elastic conductive part 113;
[0062] Step 4, welding the elastic conductive part 113 and the pole 112 to form a battery connection structure;
[0063] Step 5: Place the battery connection structure into the housing 12 and weld the cover plate 111 to the housing 12 to obtain a battery.
[0064] Furthermore, it may also include:
[0065] Step 6: coating the surface of the housing 12 with a blue film. When coating the blue film, the portion of the housing that is used to contact the pole of another battery leaks out.
[0066] In one embodiment of the present application, a battery pack is provided, comprising a plurality of batteries 10 provided in the above embodiment, wherein the plurality of batteries 10 are arranged along their height direction (i.e. Figure 4 In the vertical direction of the battery, the electrodes 112 of one battery 10 and the shell 12 of the other battery 10 are in contact and electrically connected with each other.
[0067] Figure 5Schematic diagram of the structure of batteries connected in series in one embodiment of the present application is shown. Figure 5 The adjacent first battery 20 and the second battery 30 are both the batteries 10 in the above embodiment. The pole 112 of the first battery 20 is in contact and electrically connected with the shell 12 of the second battery 30, so that the two batteries can be connected in series by contact, without welding the bar to achieve the series connection between the two batteries, which can reduce the welding process and simplify the assembly process.
[0068] Optionally, the contact portion 1121 of the pole 112 in the first battery 20 is connected to the second side of the shell 12 of the second battery 30, and the contact portion 1121 of the pole 112 in the second battery 30 is connected to the second side of the shell 12 of the adjacent third battery 40, and so on, to form a series circuit.
[0069] In one embodiment of the present application, a battery pack is provided, including the battery pack provided in the above embodiment, referring to Figure 5 The plurality of batteries in the battery pack are arranged in sequence along the height direction thereof, and in two adjacent batteries, the pole 112 of the first battery 20 is in contact and electrically connected with the housing 12 of the second battery 30. Thus, the two batteries can be directly connected in series by contact, without welding the bar sheet to realize the connection between the two batteries, which can reduce the welding process and simplify the assembly process.
[0070] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0071] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.
Claims
1. A battery connection structure, characterized in that: The battery connection structure comprises: A cover plate, used for connecting with the shell; A pole, wherein the pole is passed through the cover plate; An elastic conductive portion, the elastic conductive portion having a first end and a second end arranged opposite to each other, the first end being connected to the pole; A connecting piece, the connecting piece having a first surface and a second surface arranged opposite to each other, the first surface being connected to the second end of the elastic conductive portion; A battery cell, wherein two opposite sides of the battery cell are provided with pole ears with different polarities, the pole ear on one side of the battery cell is connected to the second surface of the connecting piece, and the pole ear on the other side of the battery cell is used to contact and electrically connect with the shell.
2. The battery connection structure according to claim 1, characterized in that: The tabs of the battery cell are full tabs.
3. The battery connection structure according to claim 2, characterized in that: The shell is a square shell. Along the length direction of the battery, a plurality of the battery cells are arranged to form a battery cell group. The connecting sheet is welded to all the battery cells in the battery cell group by a first welding stamp.
4. The battery connection structure according to claim 3, characterized in that: The elastic conductive portion is welded to the connecting sheet to form a second weld mark, and the second weld mark is staggered with the first weld mark.
5. The battery connection structure according to claim 4, characterized in that: The second weld mark is distributed on the central axis of the connecting piece along the width direction.
6. The battery connection structure according to claim 2, characterized in that: The battery core is a cylindrical winding core.
7. The battery connection structure according to claim 1, characterized in that: The elastic conductive part has an S-shape or a spiral shape.
8. A battery, characterized in that: The battery connection structure according to any one of claims 1 to 7, wherein the battery further comprises: A shell, wherein an opening is arranged on a first side of the shell, and the cover plate is connected to the shell to seal the opening; the tab on the other side of the battery cell is in contact and electrically connected with a second side of the shell, and the second side is arranged opposite to the first side.
9. A battery pack, characterized in that: It comprises a plurality of batteries as claimed in claim 8, wherein the plurality of batteries are arranged in sequence along the height direction thereof, and among two adjacent batteries, the pole of one battery is in contact with and electrically connected to the shell of the other battery.
10. A battery pack, characterized in that: Comprising the battery pack as claimed in claim 9.