Spot-welding-free battery and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a spot-welding-free battery and a battery pack, which comprise a battery cell, a protection plate and a bracket, and one end of the battery cell is provided with a positive electrode and a negative electrode; two connecting pieces are respectively connected to the positions, corresponding to the positive electrode and the negative electrode, of one side, facing the battery cell, of the protection plate, so that the protection plate is selectively and electrically connected with the battery cell through the connecting pieces; the bracket is connected with one end, provided with the positive electrode and the negative electrode, of the battery cell, and the two connecting pieces penetrate through the bracket, are detachably connected with the bracket and are used for limiting the relative positions of the protection plate and the battery cell. Thus, the protection plate and the battery cell are connected through the connecting piece, stable connection of the protection plate and the battery cell can be kept while the spot welding step is omitted, the situation that the connection effect is affected due to insufficient welding generated during spot welding is avoided, rapid assembly can be achieved, and the connection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a spot welding-free battery and a battery pack. Background Art

[0002] A battery is a device that can convert chemical energy into electrical energy. Multiple batteries can be connected to form a battery pack, increasing the capacity and voltage to suit electrical appliances with different requirements.

[0003] During the manufacturing process of lithium batteries, it is usually necessary to connect the semi-finished battery pack and the protection plate by welding (for example, spot welding), and use nickel strip as the welding medium between the semi-finished battery pack and the protection plate to form an electrical connection between the semi-finished battery pack and the protection plate.

[0004] However, spot welding may cause the risk of cold welding due to improper operation of personnel and poor quality of welding materials, and the equipment cost and labor cost are high. There is a problem that the connection effect and connection efficiency of semi-finished battery packs and protection boards connected by spot welding process are poor. Utility Model Content

[0005] The utility model aims to provide a spot welding-free battery and battery pack, so as to solve the problem that the connection effect and connection efficiency of the semi-finished battery pack and the protection board connected by the spot welding process are poor.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] A spot welding-free battery comprises: a battery cell, wherein a positive electrode and a negative electrode are arranged at one end of the battery cell; a protection plate, wherein two connectors are respectively connected to the side of the protection plate facing the battery cell at positions corresponding to the positive electrode and the negative electrode, so as to selectively electrically connect the protection plate to the battery cell through the connectors; and a bracket, wherein the bracket is connected to one end of the battery cell where the positive electrode and the negative electrode are arranged, and both of the two connectors pass through the bracket and are detachably connected to the bracket, so as to limit the relative position of the protection plate and the battery cell.

[0008] Preferably, the bracket is provided with positioning holes at positions corresponding to the positive electrode and the negative electrode, respectively, and the connecting member is selectively connected to the battery cell through the positioning holes.

[0009] Preferably, a placement groove having a shape matching that of the protection plate is formed at one end of the bracket away from the battery cell, for placing the protection plate.

[0010] Preferably, the connecting member is a spring sheet, one end of which is fixedly connected to one end of the protection plate facing the battery cell, and the other end of which is selectively abutted against the positive electrode or the negative electrode of the battery cell.

[0011] Preferably, the spot welding-free battery further comprises a limiting shell, which is sleeved on the protection plate and the bracket to limit the relative position of the protection plate and the bracket.

[0012] Preferably, the limiting shell covers at least a portion of the side wall of the battery cell, so as to limit the relative position of the bracket and the battery cell.

[0013] Preferably, the spot welding-free battery further comprises a connecting tube, wherein the connecting tube is sleeved on the outside of the battery cell, the protection plate and the bracket, and the length of the connecting tube is greater than the length of the limiting shell.

[0014] Preferably, the limiting shell is made of steel material; and / or the connecting pipe is made of plastic material.

[0015] Preferably, an insulating sheet is connected to one end of the battery cell away from the protection plate.

[0016] Preferably, a battery pack comprises a plurality of spot welding-free batteries as described above.

[0017] Beneficial effects of the utility model:

[0018] A spot welding-free battery comprises a battery cell, a protection plate and a bracket, wherein a positive electrode and a negative electrode are arranged at one end of the battery cell; two connectors are respectively connected to the side of the protection plate facing the battery cell corresponding to the positions of the positive electrode and the negative electrode, so that the protection plate and the battery cell can be selectively electrically connected through the connectors; the bracket is connected to one end of the battery cell where the positive electrode and the negative electrode are arranged, and both of the connectors pass through the bracket and are detachably connected to the bracket, so as to limit the relative position of the protection plate and the battery cell.

[0019] In this way, the protection board and the positive and negative electrodes of the battery cell are connected through the connector, which can achieve quick assembly and maintain a stable connection between the battery cell and the protection board, saving the spot welding step and avoiding the risk of cold welding; the connector passes through the bracket and is detachably connected to the bracket, which can enable the bracket to limit the position of the connector, preventing the connector from shifting and losing connection with the positive or negative electrode, thereby improving the connection effect between the battery cell and the protection board and improving the connection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of a spot welding-free battery in one embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the partial structure of the protection plate and the connecting member in one embodiment of the utility model;

[0022] Figure 3It is a schematic diagram of the local structure of the limiting shell in one embodiment of the utility model;

[0023] Figure 4 It is a structural schematic diagram of a spot welding-free battery in one embodiment of the utility model.

[0024] In the figure:

[0025] 1. Battery cell; 11. Positive electrode; 12. Negative electrode; 13. Insulating sheet; 2. Protective plate; 21. Connector; 3. Bracket; 31. Positioning hole; 32. Placement slot; 4. Limiting shell; 5. Connecting tube. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0027] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0030] See also Figure 1 and Figure 2 The utility model provides a spot welding-free battery, including a battery cell 1, a protection plate 2 and a bracket 3. A positive electrode 11 and a negative electrode 12 are arranged at one end of the battery cell 1; two connectors 21 are respectively connected to the positions corresponding to the positive electrode 11 and the negative electrode 12 on the side of the protection plate 2 facing the battery cell 1, so that the protection plate 2 and the battery cell 1 can be selectively electrically connected through the connectors 21; the bracket 3 is connected to one end of the battery cell 1 where the positive electrode 11 and the negative electrode 12 are arranged, and the two connectors 21 both pass through the bracket 3 and are detachably connected to the bracket 3, so as to limit the relative position of the protection plate 2 and the battery cell 1.

[0031] In this embodiment, the positive electrode 11 is coaxially arranged with the battery cell 1, the negative electrode 12 is a ring structure, the negative electrode 12 is concentric with the positive electrode 11, and the two connecting parts 21 are made of conductive material. When the connecting part 21 abuts against the positive electrode 11 or the negative electrode 12, the bracket 3, the protective plate 2, and the battery cell 1 are coaxially arranged, one connecting part 21 is coaxially arranged with the protective plate 2, and the other connecting part 21 is arranged at the position of the protective plate 2 corresponding to the negative electrode 12.

[0032] It should be noted that the connector 21 is passed through the bracket 3 to connect the protection plate 2 to the bracket 3, and the bracket 3 is connected to one end of the battery cell 1 where the positive electrode 11 and the negative electrode 12 are set, so that the two connectors 21 are respectively in contact with the positive electrode 11 and the negative electrode 12 to achieve electrical connection between the protection plate 2 and the battery cell 1.

[0033] In this way, the protection plate 2 is connected to the battery cell 1 through the connector 21, which can save the spot welding step, and make the connector 21 made of conductive material abut against the battery cell 1, so that the current of the battery cell 1 can be stably transmitted to the protection plate 2 through the connector 21, avoiding the risk of cold welding, enhancing the connection effect between the battery cell 1 and the protection plate 2, and can be quickly assembled to improve the connection efficiency; since the negative electrode 12 is a ring structure, the bracket 3 is assembled to the battery cell 1, so that one of the connectors 21 abuts against the positive electrode 11, and the other connector 21 abuts against the negative electrode 12, which can save positioning time and improve connection efficiency.

[0034] See also Figure 1 In some embodiments, the bracket 3 is provided with positioning holes 31 at positions corresponding to the positive electrode 11 and the negative electrode 12, and the connector 21 passes through the positioning holes 31 and is selectively connected to the battery cell 1. The cross-sectional area of ​​the positioning hole 31 is adapted to the cross-sectional area of ​​the connector 21.

[0035] In this way, the connector 21 passes through the positioning hole 31, which can not only achieve abutment with the battery cell 1, so that the battery cell 1 and the protection plate 2 are quickly connected, eliminating the spot welding step and improving the connection effect, but also enables the connector 21 to be plugged into the bracket 3, limiting the relative position of the connector 21 and the bracket 3, avoiding the connector 21 from being offset and affecting the connection effect between the connector 21 and the battery cell 1.

[0036] See also Figure 1 In some embodiments, a placement groove 32 having a shape matching that of the protection plate 2 is provided at one end of the bracket 3 away from the battery cell 1 for placing the protection plate 2. There are two corresponding positioning holes 31, and both positioning holes 31 are provided at the bottom of the placement groove 32.

[0037] In this way, the protection plate 2 is placed in the placement groove 32 and clamped with the bracket 3, which can facilitate the staff to quickly install the protection plate 2 on the bracket 3, thereby improving the connection efficiency. The protection plate 2 is not easy to fall off or shift when installed on the bracket 3, so that the protection plate 2 is stably connected to the battery cell 1, thereby improving the connection effect between the battery cell 1 and the protection plate 2.

[0038] It can be understood that an elastic buckle can also be provided in the placement groove 32, so that the elastic buckle can limit the position of the protective plate 2 when the protective plate 2 is placed in the placement groove 32, which will not be elaborated here; the depth of the placement groove 32 can be adjusted according to actual needs, and the depth of the placement groove 32 can be equal to the thickness of the protective plate 2, or it can be greater than or less than the thickness of the protective plate 2.

[0039] See also Figure 1 and Figure 2 In some embodiments, the connector 21 is a spring, one end of which is fixedly connected to the protection plate 2 toward the battery cell 1, and the other end of which is selectively abutted against the positive electrode 11 or the negative electrode 12 of the battery cell 1. The spring is welded to the side of the protection plate 2 facing the battery cell 1, and the length direction of the spring is parallel to the length direction of the battery cell 1.

[0040] In this way, passing the spring sheet through the positioning hole 31 can quickly connect the protection plate 2 and the bracket 3, thereby improving the connection efficiency. At the same time, the relative position of the protection plate 2 and the bracket 3 is limited. After the bracket 3 is assembled to one end of the battery cell 1 where the positive electrode 11 and the negative electrode 12 are set, the ends of the two spring sheets facing away from the protection plate 2 can continuously abut against the positive electrode 11 and the negative electrode 12 respectively, thereby achieving stable abutment between the protection plate 2 and the battery cell 1 and improving the connection efficiency.

[0041] It can be understood that since the negative electrode 12 is annular, an annular hole can also be opened at the position of the bracket 3 corresponding to the negative electrode 12. In this embodiment, the cross-sectional shape of the positioning hole 31 is adapted to the longitudinal cross-sectional shape of the spring leaf. This is to fix the relative positions of the protection plate 2 and the bracket 3 when the spring leaf is inserted into the positioning hole 31, thereby improving the connection effect between the battery cell 1 and the protection plate 2.

[0042] Furthermore, the connector 21 may also be a structure made of other elastic materials, such as an elastic sheet, etc. The connector 21 may also be a rigid member, such as a connecting column made of a conductive material. The spring sheet is used in this embodiment to enable the connector 21 to continuously abut against the battery cell 1 when the bracket 3 is assembled on the battery cell 1. The structure of the connector 21 can be flexibly adjusted according to actual needs, and no further examples are given here.

[0043] See also Figure 1 and Figure 3 In some embodiments, the spot welding-free battery further includes a limiting shell 4, which is sleeved on the protection plate 2 and the bracket 3 to limit the relative position of the protection plate 2 and the bracket 3. Further, the limiting shell 4 is made of steel material, and the limiting shell 4 covers at least part of the side wall of the battery cell 1 to limit the relative position of the bracket 3 and the battery cell 1. The limiting shell 4 is pressed on the protection plate 2, the bracket 3, and the outer wall of the battery cell 1.

[0044] In this way, the protection plate 2 is assembled to the bracket 3, and the bracket 3 is connected to the battery cell 1, so that the connecting piece 21 is in contact with the battery cell 1, and the limiting shell 4 is sleeved on the outside of the bracket 3 and the battery cell 1, so as to facilitate the rapid assembly of the bracket 3 to the battery cell 1, and also protect the bracket 3 and the protection plate 2 to avoid external bumps, thereby enhancing the connection effect between the battery cell 1 and the protection plate 2.

[0045] It can be understood that when the depth of the placement groove 32 is less than the height of the protective plate 2, the protective plate 2 protrudes from the bracket 3, and the limiting shell 4 is connected to the protective plate 2 and the bracket 3. When the depth of the placement groove 32 is equal to the height of the protective plate 2, the side of the protective plate 2 facing away from the battery cell 1 is flush with the side of the bracket 3 facing away from the battery cell 1, and the limiting shell 4 is only connected to the bracket 3. The depth of the placement groove 32 can be flexibly adjusted according to actual production conditions.

[0046] See also Figure 1-Figure 4 In some embodiments, the spot welding-free battery further includes a connecting tube 5, which is sleeved on the outside of the battery cell 1, the protection plate 2 and the bracket 3, and the length of the connecting tube 5 is greater than the length of the limiting shell 4. In this embodiment, the connecting tube 5 is sleeved on the battery cell 1 and covers the side wall of the battery cell 1.

[0047] It should be noted that after the bracket 3 is assembled on the battery cell 1, the limiting tube is sleeved and pressed together with the bracket 3, and then the connecting tube 5 is sleeved on the battery cell 1 to realize the assembly of the spot welding-free battery.

[0048] In this way, the connecting tube 5 can fix the relative positions of the assembled battery cell 1, bracket 3, and protective plate 2, prevent the bracket 3 and the protective plate 2 from falling off or shifting, and make the connecting piece 21 continuously abut against the positive electrode 11 or the negative electrode 12 of the battery cell 1, thereby improving the connection effect between the battery cell 1 and the protective plate 2.

[0049] See also Figure 4 In some embodiments, the connecting pipe 5 is made of plastic material, and further, the connecting pipe 5 is made of PVC (Polyvinyl Chloride) material.

[0050] It is understandable that the material of the limiting shell 4 and the material of the connecting pipe 5 can be adjusted according to actual needs, and no further details are given here.

[0051] See also Figure 1 In some embodiments, an insulating sheet 13 is connected to one end of the battery cell 1 away from the protection plate 2 . The insulating sheet 13 abuts against the battery cell 1 and is disposed inside the connecting tube 5 .

[0052] In this way, it is possible to prevent the end of the battery cell 1 away from the bracket 3 from contacting the outside and causing the risk of leakage, thereby improving the safety performance of the spot welding-free battery.

[0053] See also Figure 1 The utility model also provides a battery pack, including a plurality of spot welding-free batteries. Further, each spot welding-free battery includes a battery core 1 and a protection plate 2.

[0054] It is understandable that one battery cell 1 can be connected to one bracket 3 , or a plurality of positioning holes 31 can be provided on one bracket 3 so that a plurality of sets of protection plates 2 can be connected to the battery cells 1 through the positioning holes 31 , which will not be elaborated here.

[0055] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A spot welding-free battery, characterized in that: include: A battery cell (1), wherein one end of the battery cell (1) is provided with a positive electrode (11) and a negative electrode (12); A protection plate (2), wherein two connectors (21) are respectively connected to the positions of the positive electrode (11) and the negative electrode (12) on one side of the protection plate (2) facing the battery cell (1), and are used to selectively electrically connect the protection plate (2) and the battery cell (1) via the connectors (21); A bracket (3), the bracket (3) being connected to one end of the battery cell (1) on which the positive electrode (11) and the negative electrode (12) are arranged, and the two connecting members (21) both pass through the bracket (3) and are detachably connected to the bracket (3), and are used to limit the relative position of the protection plate (2) and the battery cell (1).

2. The spot welding-free battery according to claim 1, characterized in that: The bracket (3) is provided with positioning holes (31) at positions corresponding to the positive electrode (11) and the negative electrode (12), respectively, and the connecting member (21) passes through the positioning holes (31) and is selectively connected to the battery cell (1).

3. The spot welding-free battery according to claim 1, characterized in that: An end of the bracket (3) facing away from the battery core (1) is provided with a placement groove (32) whose shape matches that of the protection plate (2) and is used for placing the protection plate (2).

4. The spot welding-free battery according to claim 1, characterized in that: The connecting member (21) is a spring sheet, one end of which is fixedly connected to one end of the protection plate (2) facing the battery cell (1), and the other end of which is selectively abutted against the positive electrode (11) or the negative electrode (12) of the battery cell (1).

5. The spot welding-free battery according to any one of claims 1 to 4, characterized in that: The spot welding-free battery further comprises a limiting shell (4), wherein the limiting shell (4) is sleeved on the protection plate (2) and the bracket (3) and is used to limit the relative position of the protection plate (2) and the bracket (3).

6. The spot welding-free battery according to claim 5, characterized in that: The limiting shell (4) covers at least a portion of the side wall of the battery cell (1) and is used to limit the relative position of the bracket (3) and the battery cell (1).

7. The spot welding-free battery according to claim 5, characterized in that: The spot welding-free battery further comprises a connecting tube (5), wherein the connecting tube (5) is sleeved outside the battery core (1), the protective plate (2) and the bracket (3), and the length of the connecting tube (5) is greater than the length of the limiting shell (4).

8. The spot welding-free battery according to claim 7, characterized in that: The limiting shell (4) is made of steel material; and / or the connecting pipe (5) is made of plastic material.

9. The spot welding-free battery according to any one of claims 1 to 4, characterized in that: An insulating sheet (13) is connected to one end of the battery core (1) that is away from the protection plate (2).

10. A battery pack, characterized in that: It comprises a plurality of spot welding-free batteries as described in any one of claims 1 to 9.

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