Welding tool and battery module
By using a busbar-less welding fixture to directly weld the inner tabs of the battery module, the problem of increased weight and cost of the welding fixture is solved, thus achieving lightweighting and cost reduction of the battery module.
Patent Information
- Application Number
- CN202520067321.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-01-13
AI Technical Summary
In existing technologies, there are problems with the welding fixtures being installed in the battery module, which leads to increased weight and higher costs.
A busbar-less welding fixture is used to achieve direct welding connection of the electrode tabs through welding brackets and detachable welding accessories, thus avoiding the need for a busbar.
This reduces the weight and number of parts in the battery module, decreases manufacturing costs, and enables lightweighting and non-destructive testing.
Smart Images
Figure CN223684627U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery module technology, and in particular to a welding fixture and a battery module. Background Technology
[0002] The cost of power batteries accounts for a large proportion of the total cost of new energy vehicles. Reducing the cost of power batteries will help reduce the overall cost of the vehicle, thereby enhancing the competitiveness of new energy vehicles.
[0003] In the production and processing of individual battery modules, laser welding technology is generally used to weld the positive and negative electrodes of adjacent cells together to achieve electrical connection, enabling series and parallel connections between the battery cells. For example, existing technologies typically use aluminum busbars, fixing the busbars to the battery module frame and flattening the tabs to be welded onto the busbars. Laser welding is then used to weld the tabs and busbars together, thus achieving electrical connection. However, the inclusion of busbars in the power battery module not only increases component costs but also leads to an increase in the weight of the power battery module.
[0004] Therefore, there is an urgent need for a welding fixture and battery module to solve the above-mentioned technical problems. Utility Model Content
[0005] The purpose of this invention is to provide a welding fixture that can avoid setting up busbars in the battery module, thereby achieving lightweighting of the battery module and reducing the production cost of the battery module.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] A welding fixture is used to assist in welding tabs to battery cells arranged along a preset first direction. The welding fixture includes a welding bracket and a welding auxiliary component. The welding bracket supports the welding auxiliary component, which is detachably connected to the welding bracket. The welding auxiliary component has an abutment surface and a welding groove. The abutment surface abuts against and limits the tab, and abuts against the side of the tab facing the battery cell after it is bent along a preset second direction. The preset second direction is perpendicular to the preset first direction. The welding groove is positioned directly opposite the welding area of the tab so that the welding area is suspended.
[0008] Preferably, at least three of the battery cells are arranged in an array, the welding bracket extends along the preset first direction, and the welding auxiliary component is detachably connected to the welding bracket at a position opposite to the position between two adjacent battery cells.
[0009] Preferably, the welding tool further comprises a threaded fastener, and the welding auxiliary member and the welding support are detachably connected by the threaded fastener.
[0010] Preferably, the welding auxiliary member further comprises a first limiting structure, and the welding support is provided with a second limiting structure, the first limiting structure and the second limiting structure are capable of being limitingly inserted in a preset third direction to detachably fix the welding auxiliary member and the welding support, and the preset third direction is perpendicular to the preset first direction and the preset second direction.
[0011] Preferably, the welding auxiliary member comprises a body portion, the first limiting structure comprises a buckle portion, the buckle portion is connected to a side of the body portion close to the battery cell, the second limiting structure comprises an insertion slot, and the buckle portion is capable of being inserted into the insertion slot in the preset third direction.
[0012] Preferably, a dimension of the buckle portion in the preset first direction is configured as a width of the buckle portion, and the width of the buckle portion decreases with the proximity to the body portion in the preset second direction to form a limiting recess between the buckle portion and the body portion, and a part of the welding support is capable of being limitingly inserted into the limiting recess.
[0013] Preferably, the welding tool further comprises a base for supporting the welding auxiliary member in a preset third direction, and the preset third direction is perpendicular to the preset first direction and the preset second direction.
[0014] Preferably, the welding tool further comprises a clamping assembly for clamping and fixing the battery cell in the preset first direction.
[0015] Preferably, the welding auxiliary member is further provided with a positioning hole, and the positioning hole is arranged at a side of the welding auxiliary member away from the battery cell, and the positioning hole is used for assisting the welding equipment in positioning.
[0016] The welding tool has the advantages that: by the welding device, the welding connection of the tab in the battery module can be realized, and the direct welding connection of the tab in the mode without bus bar can be realized by the mode of detaching the welding auxiliary member, so that the bus bar is avoided to be arranged in the battery module, the weight of the battery module is greatly reduced, the number and cost of parts are reduced, and the production manufacturing cost and light weight of the battery module can be reduced.
[0017] The utility model discloses a battery module has lower production manufacturing cost, and the weight is lighter.
[0018] To achieve the purpose, the utility model discloses the following technical scheme:
[0019] The battery module comprises at least two electric cores, and the tab of two adjacent electric cores is directly welded and connected in a busbar-free mode.
[0020] The battery module has the advantages that: in the battery module, the busbar is avoided to be arranged, the weight of the battery module is greatly reduced, the number and cost of parts are reduced, and the production manufacturing cost and light weight of the battery module can be reduced. BRIEF DESCRIPTION OF DRAWINGS
[0021] Figure 1 Is the schematic diagram of the welding tool provided in the utility model for welding;
[0022] Figure 2 Is the enlarged view of the welding auxiliary part installed on the welding support;
[0023] Figure 3 Is the enlarged view of the welding auxiliary part separated from the welding support;
[0024] Figure 4 Is the perspective view of the welding auxiliary part provided in the utility model.
[0025] In the drawings:
[0026] 100, electric core;200, tab;
[0027] 1, welding support;11, plug-in slot;
[0028] 2, welding auxiliary part;21, body part;211, abutting surface;212, welding slot;213, positioning hole;22, buckle part;
[0029] 3, base;31, limiting slot;32, clamping assembly. DETAILED DESCRIPTION
[0030] The utility model will be further described in detail in combination with the drawings and examples.It can be understood that the specific examples described here are only used to explain the utility model, and not limit the utility model.In addition, it needs to be explained that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.
[0031] In the description of the utility model, unless another explicit provision and limitation, the term "connect", "connection", "fixed", "abutment" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two elements of the interaction relationship.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0032] In the utility model, unless another explicit provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, can also include the first and second features are not direct contact but contact through another feature between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.
[0033] In the description of the embodiment, the orientation or position relationship of the terms "on", "under", "right", "left" and the like is based on the orientation or position relationship shown in the drawing, only for the convenience of description and simplification of operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.
[0034] The following is according to the drawings Figure 1 to the drawings Figure 4 The utility model provides a welding tool and battery module.
[0035] As Figure 1 , Figure 2 As shown in the embodiment, the welding tool is mainly used for welding the pole lug 200 of the plurality of battery cells 100 arranged and disposed, so as to realize the electrical connection of the plurality of battery cells 100 in the battery module.The welding tool mainly includes a welding support 1 and a welding auxiliary part 2, wherein the welding support 1 is used for supporting the welding auxiliary part 2, so that the welding auxiliary part 2 can abut stably on the pole lug 200, thereby realizing welding.
[0036] Specifically, in the embodiment, as Figure 2As shown, multiple battery cells 100 are arranged along a preset first direction (as shown by the X-axis in the figure), and a welding bracket 1 extends along the preset first direction. A welding auxiliary component 2 is detachably connected to the welding bracket 1. A tab 200 is located at the end of the battery cell 100, and the tabs 200 of two adjacent battery cells 100 bend towards each other, allowing a portion of the two tabs 200 to overlap, forming a welding area. The welding auxiliary component 2 is provided with an abutment surface 211 and a welding groove 212. During welding, the welding auxiliary component 2 is located between the battery cell 100 and the tab 200, allowing the abutment surface 211 to abut against the side of the tab 200 facing the battery cell 100 along a preset second direction (as shown by the Y-axis in the figure). The preset second direction is perpendicular to the preset first direction. The welding groove 212 is directly opposite the overlapping part of the two tabs 200, i.e. the welding area mentioned above, so that the welding area is in a suspended state, which facilitates welding and avoids the heat during welding causing a welded connection between the contact surface 211 and the tab 200. This also allows the welding auxiliary part 2 to be properly separated from the tab 200 after welding.
[0037] When using this welding fixture for welding, exemplarily, refer to Figure 1 , Figure 2 As shown, the battery cells 100 are first arranged along the X-axis, and the welding bracket 1 is fixed so that it extends along the X-axis, and the welding auxiliary component 2 installed on the welding bracket 1 is located between two adjacent battery cells 100. Then, as... Figure 2 As shown, the tabs 200 of two adjacent cells 100 are bent towards each other, overlapping and abutting against the contact surface 211 of the welding aid 2. Then, the shape of the two tabs 200 is fixed by methods such as rolling. Finally, the welding nozzle of the welding equipment is placed against the tabs 200, so that the welding nozzle and the contact surface 211 clamp and fix the two tabs 200 along the Y-axis, allowing welding to be performed on the overlapping part of the tabs 200. At this time, due to the welding groove 212, the tabs 200 are in a suspended state, resulting in less heat loss, higher welding efficiency, and preventing welding connection between the tabs 200 and the welding aid 2 due to heat transfer. After welding, as shown... Figure 3 As shown, the welding auxiliary component 2 can be disassembled, ultimately allowing the tabs 200 of two adjacent cells 100 to be directly welded together without a busbar.
[0038] By the welding device, not only the welding connection of the tab 200 in the battery module can be realized, but also the direct welding connection of the tab 200 without busbar can be realized by the way of dismounting the welding auxiliary part 2, so that the busbar is avoided to be arranged in the battery module, the weight of the battery module is greatly reduced, and the part quantity and part cost are reduced, which can be beneficial to reduce the production manufacturing cost and light weight of the battery module. Moreover, since the welding auxiliary part 2 can be taken out, when the welding quality detection is performed, the side of the tab 200 close to the battery cell 100 can also be observed, so that whether the welding is up to the standard can be detected by means of ultrasonic detection or image CCD detection, compared with the traditional pry detection scheme, the nondestructive detection is realized.
[0039] Of course, the welding tool can also realize the welding connection between more quantity of battery cells 100. Exemplarily, three or more quantity of battery cells 100 are arranged along the preset first direction, the welding support 1 is arranged along the preset first direction, and the welding auxiliary part 2 is detachably connected to the welding support 1 at a position opposite to the adjacent two battery cells 100. When welding, all the tabs 200 to be welded are sequentially rolled and shaped, so that the tabs 200 are attached to the abutting surface 211 of the corresponding welding auxiliary part 2, and then each group of tabs 200 is welded by the welding equipment. Therefore, in the utility model, the quantity of the welding auxiliary part 2 in the welding tool is not specifically limited.
[0040] As shown in Figure 3 , Figure 4 In the embodiment, the welding auxiliary part 2 further comprises a first limiting structure, the welding support 1 is provided with a second limiting structure, and the first limiting structure and the second limiting structure can be limitedly inserted along a preset third direction (as shown by the Z axis in the figure) to detachably fix the welding auxiliary part 2 and the welding support 1. The preset third direction is perpendicular to the preset first direction, and the preset third direction is perpendicular to the preset second direction.
[0041] Continuing to refer to Figure 3 , Figure 4 The welding auxiliary part 2 comprises a body part 21, the body part 21 is provided with the abutting surface 211 and the welding groove 212, and the abutting surface 211 can abut on the tab 200 along the preset second direction. The first limiting structure comprises a buckle part 22, and the buckle part 22 is connected to the side of the body part 21 close to the battery cell 100. The second limiting structure comprises an insertion groove 11, and the buckle part 22 can be inserted into the insertion groove 11 along the preset third direction, and is limitedly fixed with the welding support 1 along the preset second direction and the preset first direction.
[0042] Specifically, in the embodiment, the preset first direction and the preset second direction are both horizontally arranged and perpendicular to each other, and the preset third direction is a vertical direction. After the buckle part 22 is inserted into the insertion slot 11, the welding auxiliary part 2 and the welding support 1 are limited in any direction on the horizontal plane, and can only be separated by moving in the vertical direction. Such a limiting arrangement can ensure that the welding auxiliary part 2 can be clamped and fixed with the copper nozzle of the welding machine to realize clamping and fixing of the tab 200, thereby ensuring the welding quality and welding efficiency.
[0043] More specifically, the size of the buckle part 22 along the preset first direction is defined as the width of the buckle part 22, and along the preset second direction, the width of the buckle part 22 decreases as it approaches the body part 21, thereby achieving limiting and fixing along the preset second direction and the preset first direction. For example, in the embodiment, the buckle part 22 is in a cylindrical shape, and the edge position of the cylindrical shape is fixedly connected with the body part 21. That is, along the preset second direction, the width of the buckle part 22 decreases to less than the diameter of the cylinder as it approaches the body part 21, and a limiting recess is formed between the buckle part 22 and the body part 21. The part of the welding support 1 at the insertion slot 11 forms a limiting protrusion, which can be inserted into the limiting recess, thereby achieving limiting and fixing between the welding support 1 and the welding auxiliary part 2.
[0044] Of course, in some other embodiments, the buckle part 22 can also adopt a T-shaped, triangular or other shaped columnar body, thereby achieving the same limiting and fixing effect, and therefore the specific shape of the buckle part 22 is not limited in the utility model. In addition to the buckle connection mode, a threaded fastener or the like can also be used to achieve detachable connection or further fixation, which also belongs to the scope to be protected by the utility model.
[0045] Preferably, in the embodiment, the welding auxiliary part 2 is also provided with a positioning hole 213, which is arranged on the side of the welding auxiliary part 2 away from the battery cell 100, and is used for assisting the welding equipment in positioning. Figure 4 As shown in the drawings, along the preset third direction, two positioning holes 213 are arranged on the welding auxiliary part 2, and the welding groove 212 is located between the two positioning holes 213.
[0046] Optionally, in some embodiments, the welding tool further comprises a base 3, which is fixedly arranged, and the welding support 1 is arranged above the base 3 in the vertical direction, and the welding auxiliary part 2 can be fixed between the welding support 1 and the base 3. The base 3 is provided with a limiting groove 31, and the bottom end of the welding auxiliary part 2 can be limitedly inserted into the limiting groove 31, and the base 3 can support the welding auxiliary part 2 in the vertical direction to avoid its falling. In this way, the welding auxiliary part 2 can only be detached by pulling it upwards, further ensuring the stability of the welding auxiliary part 2 and the tab 200 during welding.
[0047] Optionally, the welding tool further comprises a clamping assembly 32 arranged on the base 3 and capable of clamping and fixing the battery cell 100 in a preset first direction, so as to avoid movement of the battery cell 100 during welding, causing movement of the tab 200 and welding defects such as virtual welding.
[0048] The utility model further provides a battery module, the battery module includes at least two battery cells 100, and the tab 200 between two adjacent battery cells 100 is directly welded and connected in the mode without bus bar by the welding tool.
[0049] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0050] Obviously, the above embodiments of the present utility model are only examples for clearly illustrating the present utility model, and are not a limitation on the embodiments of the present utility model. For ordinary skilled in the art, various obvious changes, readjustment and replacement can be made without departing from the protection scope of the present utility model. Here, it is not necessary and impossible to enumerate all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the present utility model should be included in the protection scope of the claims of the present utility model.
Claims
1. A welding tooling for assisting tab (200) welding of an electric cell (100) arranged in a preset first direction, characterized in that, The welding tooling comprises a welding support (1) and a welding auxiliary (2), the welding support (1) is used for supporting the welding auxiliary (2), the welding auxiliary (2) is detachably connected to the welding support (1), the welding auxiliary (2) is provided with an abutting surface (211) and a welding groove (212), the abutting surface (211) is used for abutting and limiting the tab (200), and is abutted on one side of the tab (200) towards the battery cell (100) after being bent along a preset second direction, the preset second direction is perpendicular to the preset first direction, and the welding groove (212) is provided opposite to the welding area of the tab (200) to make the welding area in a suspended state.
2. The welding tooling according to claim 1, characterized in that, At least three battery cells (100) are arranged, the welding support (1) is arranged along the preset first direction, and the welding support (1) is detachably connected with the welding auxiliary (2) opposite to the position between the adjacent two battery cells (100).
3. The welding tooling according to claim 1, characterized in that, The welding tooling further comprises a threaded fastener, and the welding auxiliary (2) and the welding support (1) are detachably connected through the threaded fastener.
4. The welding tooling according to claim 1, characterized in that, The welding auxiliary (2) further comprises a first limiting structure, the welding support (1) is provided with a second limiting structure, the first limiting structure and the second limiting structure can be limitedly inserted along a preset third direction to detachably fix the welding auxiliary (2) and the welding support (1), and the preset third direction is perpendicular to the preset first direction and the preset second direction.
5. The welding tooling according to claim 4, characterized in that, The welding auxiliary (2) comprises a body part (21), the first limiting structure comprises a buckle part (22), the buckle part (22) is connected to the side of the body part (21) close to the battery cell (100), the second limiting structure comprises an insertion groove (11), and the buckle part (22) can be inserted into the insertion groove (11) along the preset third direction.
6. The welding tooling according to claim 5, characterized in that, The size of the buckle part (22) along the preset first direction is configured as the width of the buckle part (22), along the preset second direction, the width of the buckle part (22) decreases close to the body part (21) to form a limiting recess between the buckle part (22) and the body part (21), and part of the welding support (1) can be limitedly inserted into the limiting recess.
7. The welding tooling according to claim 1, characterized in that, The welding tooling further comprises a base (3), and the base (3) is used for supporting the welding auxiliary (2) along a preset third direction, and the preset third direction is perpendicular to the preset first direction and the preset second direction.
8. The welding tooling of claim 1, wherein, the welding tooling further comprises a clamping assembly (32) configured to clamp and secure the battery cell (100) in the predetermined first direction.
9. The welding tooling of claim 1, wherein, the welding aid (2) further comprises a positioning hole (213) disposed on a side of the welding aid (2) away from the battery cell (100), the positioning hole (213) configured to assist a welding device in positioning.
10. A battery module, characterized by the battery module comprises at least two battery cells (100), and the tabs (200) of adjacent two battery cells (100) are directly welded and connected in a busbar-free manner, and the busbar-free manner is welding by the welding tooling of any one of claims 1-9.