Battery device

Abstract

The utility model relates to the technical field of batteries, and discloses a battery device. The battery device comprises a box body with an accommodating space; the battery pack is arranged in the accommodating space and comprises a plurality of single batteries, the large surfaces of every two adjacent single batteries are attached to each other, and an electrode leading-out part of each single battery extends out of one end, in the length direction, of the single battery; the conducting bars are arranged on the sides, away from the single batteries, of the electrode leading-out parts in the length direction, each conducting bar is connected with the corresponding electrode leading-out part, and each conducting bar is provided with a turned edge which is perpendicular to the length direction and turned to the top face of the corresponding single battery; and the wire harness plate assembly is arranged on the top surface of the battery pack and is welded with the turned-over edge. The flanging of the conducting bar is welded with the wiring harness plate assembly on the top surface of the battery pack, so that a flanging is not required to be arranged on the wiring harness plate assembly, the flexible wiring harness plate assembly is not easy to damage when being arranged in the box body, the wiring harness plate assembly normally acquires parameters such as current, voltage and temperature of the battery, and the battery normally works.

Description

Technical Field

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

[0002] As lithium-ion battery technology becomes increasingly mature, lithium-ion batteries are increasingly used as power batteries in electric vehicles and energy storage fields.

[0003] A lithium-ion battery pack typically includes multiple cells. An existing type of battery has an appearance similar to a blade, which can be called a blade battery. The blade battery adopts a flat, long strip design. Its shape is as thin and long as a blade, which makes it easier to integrate the battery into the vehicle's battery pack and can more efficiently utilize space, thereby providing better safety performance while maintaining a higher energy density.

[0004] At present, multiple blade batteries are connected through conductive bars, and then multiple blade batteries are connected in series or parallel to form the required voltage or current output. The conductive bars are also connected to the flexible circuit board, and the current, voltage, temperature and other parameters of the blade battery are collected through the flexible circuit board to ensure the safe operation of the battery.

[0005] Usually, the conductive strip and flexible circuit board of the blade battery are arranged on the side of the blade battery. Since the strength of the flexible circuit board is not high, the flexible circuit board is easily damaged during a side collision. After the flexible circuit board is installed in the box, due to insufficient side space, the flexible circuit board cannot be welded to the conductive strip on the side.

[0006] Therefore, the flexible circuit board is placed above the battery. When the flexible circuit board is welded to the conductive bus, a connecting flange connected to the conductive bus on the side is provided on the flexible circuit board. Since the strength of the flexible circuit board is not high, the connecting flange is easily damaged when the flexible circuit board is installed in the box, which causes the flexible circuit board to be unable to collect the battery's current, voltage, temperature and other parameters. The battery cannot be charged or discharged normally, and overcharging, over-discharging, short circuit and other situations may occur, which in turn causes the risk of battery heating, bulging and even explosion. Utility Model Content

[0007] In view of this, the present invention provides a battery device to solve the problem that the connection flange is easily damaged when the flexible circuit board is installed in the box, resulting in the battery not being able to work properly.

[0008] The utility model provides a battery device, comprising: a box body having an accommodating space; a battery pack arranged in the accommodating space, the battery pack comprising a plurality of stacked single cells, each single cell having two large surfaces extending along its length direction, the large surfaces of two adjacent single cells being arranged in contact with each other, and an electrode lead-out portion of the single cell extending from one end of the single cell along its length direction; a plurality of conductive bars arranged on a side of the electrode lead-out portion away from the single cell along the length direction, each conductive bar being connected to a corresponding electrode lead-out portion, the conductive bar having a flange perpendicular to the length direction and folded onto the top surface of the corresponding single cell; a wiring harness plate assembly arranged on the top surface of the battery pack, the wiring harness plate assembly being welded to the flange, and the wiring harness plate assembly being used to collect electrical signals and / or temperature signals of the single cell.

[0009] Beneficial effect: A flange is provided on the conductive bar, and the flange is welded to the wiring harness plate assembly on the top surface of the battery pack. There is no need to provide a flange on the wiring harness plate assembly, and the wiring harness plate assembly is not easily damaged when it is installed in the box, so that the wiring harness plate assembly can normally collect the battery's current, voltage, temperature and other parameters, and the battery can work normally, effectively solving the problem that the connection flange is easily damaged when the wiring harness plate assembly is installed in the box, resulting in the battery not being able to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 This is a three-dimensional diagram of the interior of a battery device according to an embodiment of the present invention;

[0012] Figure 2 for Figure 1 A three-dimensional diagram of two single cells, an insulating bracket and a conductive bar;

[0013] Figure 3 for Figure 2 A partial exploded view of two single cells, an insulating bracket, and a conductive bar is shown;

[0014] Figure 4 for Figure 3 A partial schematic diagram of the right side of the two single cells, the insulating bracket and the conductive bar shown;

[0015] Figure 5 for Figure 4 A three-dimensional view of the two single cells, the insulating bracket and the conductive row from another perspective;

[0016] Figure 6 for Figure 3 A three-dimensional view of the two single cells, the insulating bracket and the conductive row from another perspective;

[0017] Figure 7 for Figure 5 A perspective view of the insulating bracket and the conductive bar shown;

[0018] Figure 8 for Figure 7 A top view of the conductive bar shown;

[0019] Figure 9 for Figure 1 A top view of a single cell is shown;

[0020] Figure 10 for Figure 1 The schematic diagram of the structure of the wiring harness plate assembly and crossbeam of the battery device is shown.

[0021] Description of reference numerals:

[0022] 2. Single cell; 201. End; 2011. Thinning area; 2012. Avoidance space; 2013. Electrode lead-out portion; 202. Flange edge;

[0023] 3. Conductive bar; 301. Flanged edge; 302. Main body; 303. Bend piece;

[0024] 4. Insulating bracket; 401. Top folding portion; 402. Bottom folding portion; 403. Groove; 404. Reinforcement structure; 405. Matching portion;

[0025] 5. Wire harness board assembly;

[0026] 6. Crossbeam. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0028] The following combination Figures 1 to 10 , describing the embodiments of the present utility model.

[0029] According to an embodiment of the present utility model, a battery device is provided, comprising: a box, a battery pack, a plurality of conductive bars 3 and a wiring harness plate assembly 5, the box having a accommodating space; each single cell 2 having two large surfaces extending along its length direction, the large surfaces of two adjacent single cells 2 being arranged in affixed relation, and the electrode lead-out portion 2013 of the single cell 2 extending from one end of the single cell 2 along its length direction; a plurality of conductive bars 3 being arranged on a side of the electrode lead-out portion 2013 away from the single cell 2 along the length direction, each conductive bar 3 being connected to a corresponding electrode lead-out portion 2013, the conductive bar 3 having a flange 301 perpendicular to the length direction and folded onto the top surface of the corresponding single cell 2; the wiring harness plate assembly 5 being arranged on the top surface of the battery pack, the wiring harness plate assembly 5 being welded to the flange 301, and the wiring harness plate assembly 5 being used to collect electrical signals and / or temperature signals of the single cell 2.

[0030] In the battery device using this embodiment, a flange 301 is provided on the conductive bar 3, which is welded to the wiring harness plate assembly 5 on the top surface of the battery pack through the flange 301. There is no need to provide a flange 301 on the wiring harness plate assembly 5. The flexible wiring harness plate assembly 5 is not easily damaged when it is installed in the box, so that the wiring harness plate assembly 5 can normally collect the current, voltage, temperature and other parameters of the battery, and the battery can work normally, effectively solving the problem that the connection flange is easily damaged when the wiring harness plate assembly is installed in the box, resulting in the battery not being able to work normally.

[0031] In one embodiment, Figures 4 to 7 As shown, the battery device also includes an insulating bracket 4 between the electrode lead-out portion 2013 and the conductive bar 3. The insulating bracket 4 has a top folded portion 401 that folds onto the top surface of the single battery cell 2. The top folded portion 401 supports the corresponding flange 301. When the flange 301 is welded to the wiring harness plate assembly 5, the top folded portion 401 of the insulating bracket 4 supports the flange 301, making the welding more stable and reliable. In turn, the weld between the conductive bar 3 and the wiring harness plate assembly 5 is more secure and reliable, improving structural stability.

[0032] Furthermore, the flange 301 is fixed to the wiring harness plate assembly 5 by laser welding. Laser welding has the advantages of high precision, high speed and high energy efficiency. It can not only improve the welding quality and efficiency, but also reduce the thermal damage during the welding process, thereby ensuring the safety and reliability of the battery.

[0033] In one embodiment, Figure 8 As shown, the length L1 of the flange 301 along the length direction of the single battery 2 is 8mm-20mm. Figure 8 The transverse dimension of the middle flange 301.

[0034] Furthermore, the length L1 of the flange 301 should be neither too long nor too short. If the length L1 of the flange 301 is longer, it means that more material is used for the flange 301, which is more expensive and will increase the weight of the conductive bar 3, thereby affecting the weight of the entire battery device. A longer flange 301 will occupy more space inside the battery device, which is not conducive to the arrangement of other components. The longer length of the flange 301 makes the conductive path longer, thereby increasing the resistance of the conductive bar 3. The greater resistance causes increased energy loss during power transmission, and generates additional heat under high current conditions, which puts higher requirements on the heat dissipation design; if the length L1 of the flange 301 is shorter, the welding area between the flange 301 and the wiring harness plate assembly 5 is smaller, resulting in insufficient welding strength between the conductive bar 3 and the wiring harness plate assembly 5, thereby affecting the reliability between the conductive bar 3 and the wiring harness plate assembly 5.

[0035] Therefore, the length of the flange 301 is set to 8mm-20mm, that is, the length of the flange 301 is set within a reasonable range, which not only ensures the welding area between the flange 301 and the wiring harness plate assembly, and thus ensures the welding strength between the conductive bar 3 and the wiring harness plate assembly, but also controls the material usage of the flange 301, the weight of the conductive bar 3, the occupied space, and the conductive path, thereby reducing costs and facilitating the arrangement of other components. It can also reserve space for a second welding to ensure that a second welding can be met after a welding error.

[0036] Specifically, the length of the flange 301 may preferably be 9 mm, 10 mm, 12 mm, 12.5 mm, 13 mm, 14.5 mm, 14 mm, 15.5 mm, 15 mm, 16 mm, 17 mm, 18 mm, 18.5 mm or 19 mm.

[0037] In one embodiment, Figure 6 、 Figure 7 and Figure 10 As shown, a crossbeam 6 is provided in the accommodating space, and the crossbeam 6 divides the accommodating space into two battery spaces. The wiring harness plate assembly 5 spans over the crossbeam 6 and is welded to the flange 301 of the conductive bar 3 in the two battery spaces. The provision of the crossbeam 6 can significantly enhance the structural rigidity of the battery pack and reduce deformation caused by vibration or impact during vehicle driving. In the event of a collision, the crossbeam can act as a buffer, absorbing part of the impact energy through its own deformation, reducing the energy transferred to the single cell, and thus reducing the risk of battery damage. The wiring harness plate assembly 5 spans over the crossbeam 6, simplifying the structure. There is no need to set an avoidance structure when the wiring harness plate assembly spans the crossbeam, which makes the process complicated.

[0038] In one embodiment, Figure 4 and Figure 5As shown, the single cell 2 also has two small surfaces arranged between the two large surfaces, the two small surfaces are the top surface and the bottom surface respectively, the top surface and the bottom surface have flange edges 202, the insulating bracket 4 also has a bottom folding portion 402 folded onto the bottom surface of the single cell 2, one side of the top folding portion 401 and the bottom folding portion 402 extending in the length direction has a groove 403 for accommodating the flange edge 202, and the other side of the top folding portion 401 and the bottom folding portion 402 extending in the length direction has a reinforcement structure 404.

[0039] The provision of grooves 403 on the top and bottom folds 401 and 402 to accommodate the flange 202 allows for positioning of the insulating bracket 4, ensuring proper installation. The provision of grooves 403 also increases the bending rigidity of the material, improving its load-bearing capacity by altering the cross-sectional shapes of the top and bottom folds 401 and 402. The reinforcing structure 404 enhances the structural strength and rigidity of the insulating bracket 4, preventing deformation during welding of the flange 301 and the wiring harness plate assembly 5, thereby improving welding quality.

[0040] Specifically, the reinforcement structure 404 is a reinforcement rib protruding from the top surface of the flange 301 .

[0041] Furthermore, flange edges 202 are also provided on the two end faces of the single cell 2. At this time, a flange edge 202 is provided around the single cell 2. At this time, the part of the insulating bracket 4 located between the top folded portion 401 and the bottom folded portion 402 forms a matching portion 405 that matches the end 201.

[0042] It should be noted that the top folding portion 401 , the bottom folding portion 402 , the reinforcement structure 404 , and the matching portion 405 are integrally formed.

[0043] In one embodiment, Figure 8 and Figure 9 As shown, the ratio of the length L1 of the flange 301 to the length L of the single battery 2 is 1%-5%. Figure 9 The lateral dimension of the single cell 2.

[0044] Furthermore, the ratio of the length L1 of the flange 301 to the length L of the single cell 2 should be neither too large nor too small. If the ratio of the length L1 of the flange 301 to the length L of the single cell 2 is large, it means that the length L1 of the flange 301 is long, the flange 301 uses more material, the cost is higher, and the weight of the conductive bar 3 is increased, which in turn affects the weight of the entire battery device. The longer flange 301 will occupy more space inside the battery device, which is not conducive to the arrangement of other components. The longer length of the flange 301 makes the conductive path longer, which in turn leads to increased resistance of the conductive bar 3. The greater resistance causes increased energy loss during power transmission and generates additional heat under high current conditions, which puts higher requirements on the heat dissipation design. If the ratio of the length L1 of the flange 301 to the length L of the single cell 2 is small, it means that the length L1 of the flange 301 is short, and the welding area between the flange 301 and the wiring harness plate assembly 5 is small, resulting in insufficient welding strength between the conductive bar 3 and the wiring harness plate assembly, which in turn affects the reliability of the conductive bar 3 and the wiring harness plate assembly.

[0045] Therefore, the ratio of the length L1 of the flange 301 to the length L of the single cell 2 is set to 1%-5%, that is, the ratio of the length L1 of the flange 301 to the length L of the single cell 2 is set within a reasonable range. This not only ensures the welding area between the flange 301 and the wiring harness plate assembly 5, and thus ensures the welding strength between the conductive bar 3 and the wiring harness plate assembly 5, but also controls the material usage of the flange 301, the weight of the conductive bar 3, the occupied space, and the conductive path, thereby reducing costs and facilitating the arrangement of other components. It can also reserve space for a second welding to ensure that a second welding can be met after a welding error.

[0046] Specifically, the ratio of the length L1 of the flange 301 to the length L of the single battery 2 may preferably be 2%, 2.5%, 3%, 3.5%, 4% or 4.5%.

[0047] In one embodiment, Figure 8 and Figure 9 As shown, the ratio of the width W1 of the flange 301 along the width direction of the single battery 2 to the width W of the single battery 2 is 40%-60%. Figure 8 The vertical dimension of the middle flange 301 is the width W of the single battery 2. Figure 9 The vertical dimension of the single cell 2.

[0048] Furthermore, the ratio of the width W1 of the flange 301 to the width W of the cell 2 should be neither too large nor too small. If the ratio of the width W1 of the flange 301 to the width W of the cell 2 is large, the flange 301 is longer, which can provide a larger welding space, facilitate welding and fixing, and also improve the mechanical strength of the conductive bar 3, making the conductive bar 3 less likely to deform during installation and use. However, a longer flange 301 requires more material, increases the weight of the conductive bar 3, and takes up more space, thereby affecting the battery layout. If the ratio of the width W1 of the flange 301 to the width W of the cell 2 is small, the flange 301 is shorter, which can reduce the amount of material used, reduce the weight of the conductive bar 3, and occupy less space. However, a shorter flange 301 results in a smaller contact area between the flange 301 and the wiring harness plate assembly 5, which in turn affects welding reliability. The mechanical strength of the conductive bar 3 is also reduced, making it more likely to deform during installation and use.

[0049] Therefore, the ratio of the width W1 of the flange 301 to the width W of the single cell 2 is set to 40%-60%, that is, the ratio of the width W1 of the flange 301 to the width W of the single cell 2 is set within a reasonable range. This not only ensures the mechanical strength of the conductive bar 3, but also controls the material usage, weight, occupied space, and cost, which is beneficial to the battery layout.

[0050] Specifically, the ratio of the width W1 of the flange 301 to the width W of the single battery 2 may preferably be 45%, 48%, 50%, 52% or 55%.

[0051] In one embodiment, Figure 8 As shown, the width W1 of the flange 301 along the width direction of the single battery 2 is 8mm-18mm. Figure 8 The vertical dimension of the middle flange 301.

[0052] Furthermore, the width W1 of the flange 301 should be neither too large nor too small. If the flange 301 is longer, it can provide a larger welding space, facilitate welding and fixing, and also increase the mechanical strength of the conductive bar 3. The conductive bar 3 is less likely to deform during installation and use. However, a longer flange 301 requires more material, increases the weight of the conductive bar 3, and also takes up more space, which in turn affects the battery layout. If the flange 301 is shorter, the amount of material used can be reduced, the weight of the conductive bar 3 is reduced, and the space occupied is smaller. However, a shorter flange 301 results in a smaller contact area between the flange 301 and the wiring harness board assembly, which in turn affects welding reliability. The mechanical strength of the conductive bar 3 is also reduced, and the conductive bar 3 is prone to deformation during installation and use.

[0053] Therefore, setting the width W1 of the flange 301 to 8 mm-18 mm, that is, setting the width W1 of the flange 301 to a reasonable range, can not only ensure the mechanical strength of the conductive bar 3, but also control the amount, weight, occupied space, and cost of materials, which is beneficial to the layout of the battery.

[0054] Specifically, the width W1 of the flange 301 may preferably be 9 mm, 10 mm, 12 mm, 12.5 mm, 13 mm, 14.5 mm, 14 mm, 15.5 mm, 15 mm, 16 mm, 17 mm or 17.5 mm.

[0055] In one embodiment, Figure 4 、 Figure 5 and Figure 7 As shown, the conductive bar 3 includes a main body 302 and a bent piece 303. The upper side of the main body 302 is folded upward toward the top surface of the corresponding single cell 2 to form a flange 301. The bent piece 303 is provided on one side of the main body 302 and is connected to the corresponding electrode lead portion 2013. The provision of the bent piece 303 can enhance the mechanical strength of the conductive bar 3, helping to resist external impact and vibration. It also makes the connection between the conductive bar 3 and the electrode lead portion 2013 more stable, reducing the problem of poor contact caused by vibration or impact.

[0056] It should be noted that the plurality of conductive bars 3 form a plurality of first conductive bars, second conductive bars and third conductive sheets. The first conductive bar has two bent sheets 303 arranged opposite to each other. The first conductive bar is used to connect the electrode lead portions 2013 of two adjacent single batteries 2, that is, the first conductive bar is a series conductive bar. The second conductive bar is provided with a lead sheet, and the third conductive bar is provided with a lead sheet. The second conductive bar and the lead sheet thereon form a first lead-out conductive bar, and the third conductive bar and the lead sheet thereon form a first lead-out conductive bar.

[0057] It is worth noting that the main body 302 , the bending piece 303 and the flange 301 are formed by cutting and bending a piece of sheet material, which simplifies the processing and reduces the processing cost.

[0058] In one embodiment, Figure 4 、 Figure 5 and Figure 9As shown, each single cell 2 has two ends 201 along the length direction. Each end 201 has a thinned region 2011 and a corresponding avoidance space 2012. Each end 201 has an electrode lead-out portion 2013 protruding from its side surface on a side away from the avoidance space 2012. The avoidance space 2012 is used to avoid the corresponding electrode lead-out portion 2013. The avoidance space 2012 at the end 201 of a single single cell 2 can accommodate the electrode lead-out portion 2013 of an adjacent single cell 2, facilitating the avoidance of the electrode lead-out portion 2013. This eliminates the need for the electrode lead-out portion 2013 of the single cell 2 to occupy additional space, reduces material usage, and saves cost and weight.

[0059] It should be noted that the single cell 2 adopts a flat design, similar to a blade, and the single cell 2 can be called a blade battery. The electrode lead-out portion 2013 is specifically a pole.

[0060] Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery device, characterized in that: include: The box body has a receiving space; A battery pack is arranged in the accommodation space, the battery pack comprising a plurality of stacked single cells (2), each of the single cells (2) having two large surfaces extending along its length direction, the large surfaces of two adjacent single cells (2) being arranged in contact with each other, and the electrode lead-out portion (2013) of the single cell (2) extending from one end of the single cell (2) along its length direction; A plurality of conductive bars (3) are arranged on a side of the electrode lead-out portion (2013) away from the single battery (2) along the length direction, each conductive bar (3) is connected to the corresponding electrode lead-out portion (2013), and the conductive bar (3) has a flange (301) perpendicular to the length direction and folded onto the top surface of the corresponding single battery (2); A wiring harness plate assembly (5) is arranged on the top surface of the battery pack, the wiring harness plate assembly (5) is welded to the flange (301), and the wiring harness plate assembly (5) is used to collect electrical signals and / or temperature signals of the single battery (2).

2. The battery device according to claim 1, wherein: The battery device further comprises an insulating support (4) between the electrode lead-out portion (2013) and the conductive bar (3), the insulating support (4) having a top folding portion (401) folded onto the top surface of the single battery (2), the top folding portion (401) supporting the corresponding flange (301).

3. The battery device according to claim 1 or 2, characterized in that The length L1 of the flange (301) along the length direction of the single battery (2) is 8 mm to 20 mm.

4. The battery device according to claim 1 or 2, characterized in that: A crossbeam (6) is provided in the accommodation space, the crossbeam dividing the accommodation space into two battery spaces, the wiring harness plate assembly (5) spans above the crossbeam (6) and is welded to the flanges (301) of the conductive bars (3) in the two battery spaces.

5. The battery device according to claim 2, wherein: The single cell (2) further comprises two small faces arranged between the two large faces, the two small faces being a top face and a bottom face respectively, the top face and the bottom face both having flange edges (202), the insulating bracket (4) further comprising a bottom folding portion (402) folded onto the bottom face of the single cell (2), one side of the top folding portion (401) and the bottom folding portion (402) extending in the longitudinal direction comprising a groove (403) for accommodating the flange edges (202), and the other side of the top folding portion (401) and the bottom folding portion (402) extending in the longitudinal direction comprising a reinforcement structure (404).

6. The battery device according to claim 1 or 2, characterized in that: In the length direction, the ratio of the length L1 of the flange (301) to the length L of the single battery (2) is 1%-5%.

7. The battery device according to claim 1 or 2, characterized in that: The ratio of the width W1 of the flange (301) along the width direction of the single battery (2) to the width W of the single battery (2) is 40%-60%.

8. The battery device according to claim 1 or 2, characterized in that: The width W1 of the flange (301) along the width direction of the single battery (2) is 8 mm to 18 mm.

9. The battery device according to claim 1 or 2, characterized in that: The conductive bar (3) comprises a main body (302) and a bending piece (303), wherein the upper side of the main body (302) is folded toward the top surface of the corresponding single battery (2) to form the flange (301), and the bending piece (303) is provided on one side of the main body (302) and is connected to the corresponding electrode lead-out portion (2013).

10. The battery device according to claim 1 or 2, characterized in that: Each of the single cells (2) has two ends (201) along the length direction, each of the ends (201) has a thinning area (2011) and an escape space (2012) corresponding to the thinning area (2011), and each of the ends (201) has an electrode lead-out portion (2013) protruding from a side thereof on a side away from the escape space (2012), and the escape space (2012) is used to escape the corresponding electrode lead-out portion (2013).

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