Battery module and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery module and a battery pack, and the battery module comprises a battery cell stacking body and a supporting device, the supporting device is arranged at one end, provided with a battery cell tab, of the battery cell stacking body; the battery cell tabs comprise positive tabs and negative tabs, and the negative tabs and the positive tabs which are adjacent and connected in series are oppositely bent; the negative pole lug comprises a first attaching part and a folding part connected with the first attaching part, the folding part is bent inwards towards the direction of the supporting device, and the folding part is attached to the side, away from the positive pole lug, of the first attaching part, so that the folding part is located between the first attaching part and the supporting device; and the positive pole lug is welded on the first attaching part. According to the utility model, the raw material cost for producing the battery module is reduced, the manufacturing process is simplified, the complexity and time on a production line are reduced, and the production efficiency is further improved.

Description

Technical Field

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

[0002] The existing battery module is provided with a support frame on the top of the battery cell stack. The battery cell tabs of the battery cell stack pass through the support frame. When the positive and negative tabs of adjacent battery cells are bent and fitted together on the support frame for series welding of the tabs, an aluminum bar is placed between the battery cell tabs and the support frame bracket to prevent the support frame from exploding. Although the aluminum bar plays a supporting and anti-explosion role during welding, it increases the production cost and the complexity and process of the manufacturing process, and reduces production efficiency. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery module and a battery pack, aiming to solve the technical problem that an aluminum bar needs to be placed at the bottom when the tabs are welded in series, which increases the production cost.

[0004] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a battery module, including a battery cell stack and a supporting device;

[0005] The supporting device is arranged at one end of the battery cell stack body where the battery cell tab is arranged;

[0006] The battery cell tabs include a positive tab and a negative tab, wherein the negative tab and the positive tab, which are adjacent and connected in series, are bent relative to each other;

[0007] The negative electrode tab includes a first fitting portion and a folding portion connected to the first fitting portion, the folding portion is bent inward toward the support device, and the folding portion is fitted to the side of the first fitting portion away from the positive electrode tab, so that the folding portion is located between the first fitting portion and the support device, and the positive electrode tab is welded to the first fitting portion.

[0008] Furthermore, the supporting device includes a first supporting portion and a plurality of second supporting portions, the second supporting portion is connected to one end of the first supporting portion close to the battery cell tab, and a first through hole for the battery cell tab to pass through is provided on the second supporting portion.

[0009] Furthermore, reinforcing ribs are provided between adjacent second supporting portions, and the reinforcing ribs extend toward the first supporting portion.

[0010] Furthermore, at least one first opening groove is provided between the first fitting portion and the folding portion, and a connecting portion for connecting the first fitting portion and the folding portion is provided at at least one end of the first opening groove.

[0011] Furthermore, the length of the first opening groove is greater than or equal to half the length of the folding portion and less than the length of the folding portion.

[0012] Furthermore, a plurality of second through holes are provided between the first fitting portion and the folding portion, and the plurality of second through holes are arranged at intervals along the entire length direction of the folding portion.

[0013] Furthermore, a crease line is provided between the first fitting portion and the folding portion, and the crease line extends along the entire length direction of the folding portion.

[0014] Furthermore, the width of the folded portion is greater than or equal to one-third of the width of the entire negative electrode tab, and less than or equal to one-half of the width of the entire negative electrode tab, wherein the width direction is the direction in which the battery cell tab extends outward away from the battery cell.

[0015] Furthermore, the positive electrode tab includes a main body and a second fitting portion connected to the main body, the second fitting portion is connected to the first fitting portion, and the width of the folding portion is greater than or equal to the width of the second fitting portion, wherein the width direction is the direction in which the battery cell tab extends outward away from the battery cell.

[0016] The present invention provides a battery pack, comprising any one of the battery modules described above.

[0017] Beneficial effects:

[0018] The negative electrode tab of the present invention includes a first fitting portion and a folding portion connected to the first fitting portion, the folding portion is bent inwardly toward the support device, and the folding portion is fitted to the side of the first fitting portion away from the positive electrode tab, so that the folding portion is located between the first fitting portion and the support device, and the positive electrode tab is welded to the first fitting portion. Therefore, by eliminating the aluminum bar, the negative electrode tab that needs to be cut off is used for bending and padding between the negative electrode tab and the support device to absorb excess energy during welding, ensuring the welding quality while preventing excess laser energy from being transmitted to the support device to cause the support device to explode, thereby reducing the raw material cost of producing battery modules, simplifying the manufacturing process, reducing the complexity and time on the production line, and thus improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a battery module according to an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of the folding of the positive electrode tab and the negative electrode tab according to an embodiment of the present invention;

[0021] Figure 3This is a schematic diagram of the overall structure of a battery cell according to an embodiment of the present invention;

[0022] Figure 4 For an embodiment of the present utility model Figure 3 A partial schematic diagram of

[0023] Figure 5 This is a schematic diagram of the overall structure of a battery cell according to another embodiment of the present invention;

[0024] Figure 6 Another embodiment of the present invention Figure 5 A partial schematic diagram of

[0025] Figure 7 This is a schematic diagram of the overall structure of a battery cell according to another embodiment of the present invention;

[0026] Figure 8 Another embodiment of the present invention Figure 7 A partial schematic diagram of

[0027] Figure 9 This is an exploded view of a battery module according to an embodiment of the present invention.

[0028] in:

[0029] 1. Battery cell stack; 2. Support device; 3. Battery cell; 4. Battery cell tab;

[0030] 20. First support portion; 21. Second support portion; 22. First through hole; 23. Reinforcement rib; 26. Positive electrode connector; 27. Negative electrode connector;

[0031] 40. Positive electrode tab; 41. Negative electrode tab;

[0032] 401, main body; 402 second bonding part;

[0033] 410. First laminating portion; 411. Folding portion; 412. First opening groove; 414. Connecting portion; 415. Second through hole; 416. Crease line.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] Reference Figure 1-Figure 2 、 Figure 9 , this embodiment provides a battery module, including a battery cell stack 1 and a supporting device 2;

[0040] The supporting device 2 is provided at one end of the battery cell stack 1 where the battery cell tab 4 is provided;

[0041] The cell tabs 4 include a positive tab 40 and a negative tab 41 , wherein the adjacent negative tab 41 and the positive tab 40 connected in series are bent relative to each other;

[0042] The negative electrode tab 41 includes a first fitting portion 410 and a folding portion 411 connected to the first fitting portion 410, the folding portion 411 is bent inward toward the support device 2, and the folding portion 411 is fitted to the side of the first fitting portion 410 away from the positive electrode tab 40, so that the folding portion 411 is located between the first fitting portion 410 and the support device 2, and the positive electrode tab 40 is welded to the first fitting portion 410.

[0043] In the above embodiment, the battery module includes a cell stack 1 and a supporting device 2, wherein the supporting device 2 is arranged on the cell stack 1 and is located at one end of the cell stack 1 where a cell tab 4 is provided. The cell stack 1 includes a plurality of cells 3, and one end of each cell 3 is provided with a positive electrode tab 40 and a negative electrode tab 41, that is, a single-sided tab. In addition, when the plurality of cells 3 are stacked, the positive electrode tabs 40 and the negative electrode tabs 41 of adjacent cells 3 are staggered with each other, and when the positive electrode tabs 40 and the negative electrode tabs 41 are connected in series, the negative electrode tabs 41 of the adjacent cells 3 are bent toward the positive electrode tab 40 of the adjacent cells 3, and the positive electrode tabs 40 of the adjacent cells 3 are bent toward the negative electrode tab 41 of the adjacent cells 3, and The positive pole tab 40 is attached to the negative pole tab 41, so that the negative pole tab 41 is located between the positive pole tab 40 and the supporting device 2, or the positive pole tab 40 and the negative pole tab 41, i.e., double-sided pole tabs, are respectively provided at both ends of each battery cell 3, and the adjacent and series-connected negative pole tabs 41 and positive pole tabs 40 can also be bent relative to each other, and the positive pole tab 40 is attached to the negative pole tab 41, so that the negative pole tab 41 is located between the positive pole tab 40 and the supporting device 2, wherein the material of the positive pole tab 40 is preferably aluminum with a lower melting point, and the material of the negative pole tab 41 is preferably copper with a higher melting point; in addition, the negative pole tab 41 includes a first attaching portion 410 and a folding portion 411, the first attaching portion 410 is connected to the folding portion 411, and the folding portion 411 is located between the first fitting portion 410 and the support device 2, and the first fitting portion 410 and the folding portion 411 are an integral part. When the positive electrode tab 40 and the negative electrode tab 41 are connected in series, the first fitting portion 410 is in close contact with the positive electrode tab 40 to ensure effective transmission of current. The folding portion 411 is bent inward 180 degrees toward the support device 2, so that the folding portion 411 is attached to the side of the first fitting portion 410 away from the positive electrode tab 40, and then the folding portion 411 is folded between the first fitting portion 410 and the support device 2, and the positive electrode tab 40 is welded to the first fitting portion 410 by laser welding. Therefore, by using the part of the negative electrode tab 41 that originally needs to be cut off as the folding portion 411, the pad It replaces the aluminum bar between the negative electrode tab 41 and the support device 2 to absorb excess energy during welding. While ensuring the welding quality, it does not allow the excess energy of the laser to be transmitted to the support device 2, causing the support device 2 to explode, reducing the cost of raw materials when producing battery modules. There is no need to purchase and process aluminum bars, and there is no need to accurately install aluminum bars in each battery module. Instead, the negative electrode tab 41 itself is used to simplify the manufacturing process, reduce the complexity and time on the production line, and the folding portion 411 of the bent negative electrode tab 41 can absorb excess energy during welding, help control the energy transfer during welding, thereby reducing the impact of the laser or arc on the support device 2 frame and ensuring welding quality.

[0044] Reference Figure 1-Figure 2In one embodiment, the supporting device 2 includes a first supporting portion 20 and a plurality of second supporting portions 21, wherein the second supporting portion 21 is connected to one end of the first supporting portion 20 close to the battery cell tab 4, and a first through hole 22 for the battery cell tab 4 to pass through is provided on the second supporting portion 21.

[0045] In the above embodiment, the support device 2 includes a first support portion 20 and a plurality of second support portions 21, the first support portion 20 is connected to the second support portion 21, and the second support portion 21 is connected to the end of the first support portion 20 close to the battery cell tab 4, and the first support portion 20 and the second support portion 21 are integrated to ensure that when the positive pole tab 40 and the negative pole tab 41 are pressed and welded, the support device 2 can provide stable support to avoid the positive pole tab 40 and the negative pole tab 41 from shifting during the welding process. In addition, the materials of the first support portion 20 and the second support portion 21 include but are not limited to plastics with a high melting point such as polyphenylene sulfide, polyetheretherketone, and polyetherketoneetherketone, which ensure that the positive pole tab 40 and the negative pole tab 41 are not easily softened or deformed at high temperatures during welding and can withstand welding. The second support portion 21 is provided with a plurality of first through holes 22, which are mainly used to allow the battery cell tab 4 to pass through the support device 2, and a certain distance is formed between adjacent first through holes 22, so that the positive electrode tab 40 and the negative electrode tab 41 are located above the distance when they are in close contact for welding. In addition, the first through holes 22 include but are not limited to runway shapes or rectangles, and the length of the first through holes 22 is greater than or equal to the length of the battery cell tab 4, ensuring that the battery cell tab 4 can completely pass through the first through hole 22, and the longer length of the first through hole 22 can accommodate battery cell tabs 4 of different sizes, thereby improving the flexibility and applicability of the manufacturing process.

[0046] Furthermore, reinforcing ribs 23 are provided between adjacent second support portions 21, and the reinforcing ribs 23 extend toward the first support portion 20, so that the length of the reinforcing ribs 23 is greater than or equal to the length of the first through hole 22. When the positive electrode tab 40 and the negative electrode tab 41 are welded on the second support portion 21, the reinforcing ribs 23 can significantly improve the structural strength of the support device 2, so that the support device 2 can withstand a larger load or pressure, while increasing the rigidity of the support device 2 and reducing bending or deformation during welding or other operations.

[0047] Reference Figure 1-Figure 2 、 Figure 9In one embodiment, a positive electrode connector 26 and a negative electrode connector 27 are provided on the support device 2, and the positive electrode connector 26 and the negative electrode connector 27 are respectively arranged at two ends of the support device 2, and the positive electrode connector 26 is used to connect the total positive electrode tab of the battery cell stack 1, and the negative electrode connector 27 is used to connect the total negative electrode tab of the battery cell stack 1.

[0048] In the above embodiment, a positive electrode connector 26 and a negative electrode connector 27 are provided on the support device 2, and the positive electrode connector 26 and the negative electrode connector 27 are relatively arranged on opposite sides of the support device 2 in the width direction, wherein the positive electrode connector 26 is used to connect the total positive electrode tab of the battery cell stack 1, and the negative electrode connector 27 is used to connect the total negative electrode tab of the battery cell stack 1, and the material of the positive electrode connector 26 and the negative electrode connector 27 is preferably copper. While improving the current transmission efficiency, a symmetrical electrical connection is provided through the opposite edge design, which helps to reduce electromagnetic interference and improve the overall performance of the battery module. In addition, there can be two support devices 2, which are respectively arranged on the battery cell tabs 4 on both sides of the battery cell stack 1, and a certain gap is formed between the two support devices 2. The two support devices 2 can be an integrated connector or independent separate parts. Therefore, whether it is an integrated connection or a separate part, during the welding process, the support device 2 can fix the position of the battery cell tab 4 in the battery cell stack 1 to prevent movement or vibration, thereby improving the accuracy and quality of the tab welding.

[0049] Reference Figure 1-Figure 4 In one embodiment, at least one first opening groove 412 is provided between the first fitting portion 410 and the folding portion 411, and a connecting portion 414 for connecting the first fitting portion 410 and the folding portion 411 is provided at at least one end of the first opening groove 412.

[0050] In the above embodiment, at least one first opening groove 412 is provided between the first fitting portion 410 and the folding portion 411, and the first opening groove 412 extends a certain distance along the length direction of the folding portion 411, so that a connecting portion 414 is provided at one end of the first opening groove 412 for connecting the first fitting portion 410 and the folding portion 411, and the length of the first opening groove 412 is greater than or equal to half the length of the entire folding portion 411 and less than the length of the entire folding portion 411; in another embodiment, there are two first opening grooves 412 and they are symmetrically arranged with each other, and the two first opening grooves 412 face opposite directions. Extension, a connecting portion 414 with a certain length is formed between the two first opening grooves 412, and the connecting portion 414 is located in the middle position of the entire folding portion 411, or there are two connecting portions 414, which are respectively located at both ends of the first opening groove 412. Therefore, the folding portion 411 can be easily folded on the side of the first fitting portion 410 close to the supporting device 2 through the mutual cooperation of the connecting portion 414 and the first opening groove 412, which effectively improves the folding flexibility. In addition, the existence of the connecting portion 414 provides additional structural support, enhances the stability of the folding portion 411, and reduces the risk of breakage during the folding process.

[0051] Reference Figure 1 、 Figure 2 、 Figure 5 、 Figure 6 In one embodiment, a plurality of second through holes 415 are provided between the first fitting portion 410 and the folding portion 411, and the plurality of second through holes 415 are arranged along the entire length direction of the folding portion 411, wherein the shapes of the second through holes 415 include but are not limited to rectangular, circular, runway-shaped, etc. In addition, the plurality of second through holes 415 are arranged at certain intervals along the entire length direction of the folding portion 411, so that a dotted folding portion 411 is formed between the first fitting portion 410 and the folding portion 411, ensuring that the folding portion 411 is folded on the side of the first fitting portion 410 close to the supporting device 2 through the dotted folding portion 411, thereby improving production efficiency and reducing waste of battery cell tab 4 materials, thereby reducing production costs.

[0052] Reference Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 In one embodiment, a crease line 416 is provided between the first laminating portion 410 and the folding portion 411, and the crease line 416 extends along the entire length of the folding portion 411. The crease line 416 reduces the need for professional equipment in the folding process, thereby reducing production costs, and the precise crease line 416 helps to reduce material waste and improve material utilization.

[0053] Reference Figure 2-Figure 8In one embodiment, the width of the folding portion 411 is greater than or equal to one-third of the width of the entire negative electrode tab 41, and less than or equal to one-half of the width of the entire negative electrode tab 41, wherein the width direction is the direction in which the battery cell tab 4 extends outward away from the battery cell 3, ensuring that the positive electrode tab 40 has sufficient contact area when affixed to the first affixed portion 410, which helps to improve the electrical connection stability between the positive electrode tab 40 and the first affixed portion 410, and can improve the heat conduction efficiency during the welding process, which helps to achieve more uniform welding and reduce welding defects.

[0054] Reference Figure 2 In one embodiment, the positive electrode tab 40 includes a main body 401 and a second fitting portion 402 connected to the main body 401, the second fitting portion 402 is connected to the first fitting portion 410, and the width of the folding portion 411 is greater than or equal to the width of the second fitting portion 402, wherein the width direction is the direction in which the battery cell tab 4 extends outward away from the battery cell 3.

[0055] In the above embodiment, the positive electrode tab 40 includes a main body 401 and a second fitting portion 402, wherein the main body 401 is connected to the second fitting portion 402, and the main body 401 and the second fitting portion 402 are an integral part. When the positive electrode tab 40 and the negative electrode tab 41 are connected in series, the first fitting portion 410 is in close contact with the second fitting portion 402, and the width of the folding portion 411 located on the side of the first fitting portion 410 away from the second fitting portion 402 is greater than or equal to the width of the second fitting portion 402, wherein the width direction is the direction in which the battery cell tab 4 extends outward away from the battery cell 3. The larger width of the folding portion 411 can prevent the weld point of the first fitting portion 410 and the second fitting portion 402 from penetrating the first fitting portion 410 during welding, causing the support device 2 to explode, thereby reducing potential dangers during the welding process and improving the safety of the battery module.

[0056] This embodiment provides a battery pack, comprising the battery module described in any one of the above embodiments.

[0057] In the above embodiment, the battery pack includes a battery module. By utilizing the portion of the negative electrode tab 41 that originally needs to be cut off to make the folding portion 411, and padding it between the negative electrode tab 41 and the support device 2 instead of the aluminum bar, material waste is reduced, the manufacturing process is simplified, and production efficiency is improved. At the same time, the production cost of the battery pack is reduced, and the simplified assembly process helps to improve the efficiency of the overall production line.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery module, characterized in that: It includes a battery cell stack and a supporting device; The supporting device is arranged at one end of the battery cell stack where the battery cell tab is arranged; The battery cell tabs include a positive tab and a negative tab, wherein the negative tab and the positive tab, which are adjacent and connected in series, are bent relative to each other; The negative electrode tab includes a first fitting portion and a folding portion connected to the first fitting portion, the folding portion is bent inward toward the support device, and the folding portion is fitted to the side of the first fitting portion away from the positive electrode tab, so that the folding portion is located between the first fitting portion and the support device, and the positive electrode tab is welded to the first fitting portion.

2. The battery module according to claim 1, wherein: The supporting device includes a first supporting portion and a plurality of second supporting portions. The second supporting portion is connected to one end of the first supporting portion close to the battery cell tab, and a first through hole for the battery cell tab to pass through is provided on the second supporting portion.

3. The battery module according to claim 2, characterized in that: Reinforcing ribs are provided between adjacent second supporting portions, and the reinforcing ribs extend toward the first supporting portion.

4. The battery module according to claim 1, wherein: At least one first opening slot is provided between the first fitting portion and the folding portion, and a connecting portion for connecting the first fitting portion and the folding portion is provided at at least one end of the first opening slot.

5. The battery module according to claim 4, characterized in that: The length of the first opening groove is greater than or equal to half the length of the folding portion and less than the length of the folding portion.

6. The battery module according to claim 1, characterized in that: A plurality of second through holes are provided between the first fitting portion and the folding portion, and the plurality of second through holes are arranged at intervals along the entire length direction of the folding portion.

7. The battery module according to claim 1, characterized in that: A crease line is provided between the first laminating portion and the folding portion, and the crease line extends along the entire length direction of the folding portion.

8. The battery module according to claim 1, wherein: The width of the folded portion is greater than or equal to one-third of the width of the entire negative electrode tab, and less than or equal to one-half of the width of the entire negative electrode tab, wherein the width direction is the direction in which the battery cell tab extends outward away from the battery cell.

9. The battery module according to claim 1, wherein: The positive electrode tab includes a main body and a second fitting portion connected to the main body, the second fitting portion is connected to the first fitting portion, and the width of the folding portion is greater than or equal to the width of the second fitting portion, wherein the width direction is the direction in which the battery cell tab extends outward away from the battery cell.

10. A battery pack, characterized in that: A battery module comprising any one of claims 1 to 9.

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