A power battery pack

Abstract

The utility model discloses a kind of power battery pack, belong to battery technical field, this kind of power battery pack, including shell structure, the height of shell structure and standard lead-acid battery height are adapted, the length of shell member and standard lead-acid battery length are adapted and the width of shell member is N times of standard lead-acid battery width or the width of shell member and standard lead-acid battery width are adapted and the length of shell member is N times of standard lead-acid battery length, N=2, and it is positive integer. By limiting the size of power battery pack based on standard lead-acid battery size, i.e. according to the size of selected lead-acid battery design replaceable integrated battery pack, not single equipped shell, protection component and collection wire harness, reduce production cost, at the same time, avoid the problem that connection is unstable caused by high-voltage wire harness series connection between split type battery pack.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a power battery pack. Background Technology

[0002] With the development of new energy technologies, lithium-ion batteries have been widely used, including in small-powered vehicles such as electric two-wheelers and three-wheelers. Currently, most small-powered vehicles on the market use lead-acid batteries. However, lead-acid batteries have disadvantages such as low energy density, short cycle life, and poor environmental performance, and have been gradually phased out by the market. Replacing lead-acid batteries with lithium-ion batteries can improve these problems, especially for batteries with large capacity and high voltage platforms. Existing battery packs adopt a split design, which connects multiple standard batteries to form a large-capacity, high-voltage platform battery. However, adopting a split design means that multiple battery casings are required, resulting in wasted space and higher costs. In addition, each part of the split battery pack needs to be equipped with protection components and data acquisition harnesses, which also increases costs. Utility Model Content

[0003] The purpose of this invention is to provide a power battery pack to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a power battery pack, including a housing structure, wherein the height of the housing structure is adapted to the height of a standard lead-acid battery, the length of the housing component is adapted to the length of a standard lead-acid battery and the width of the housing component is N times the width of the standard lead-acid battery, or the width of the housing component is adapted to the width of a standard lead-acid battery and the length of the housing component is N times the length of the standard lead-acid battery, where N≥2 and is a positive integer.

[0005] This application limits the size of the power battery pack based on the standard lead-acid battery size. That is, it designs an alternative integral battery pack according to the size of the selected lead-acid battery, without separately equipping the casing, protective components and data acquisition harness, which reduces the production cost and avoids the problem of unstable connection caused by the need for series connection of split battery packs through high voltage harnesses.

[0006] Furthermore, N is 2 or 3.

[0007] Furthermore, the ratio of the capacity of the power battery pack to the capacity of the standard lead-acid battery is greater than or equal to 1.5.

[0008] Furthermore, the housing structure includes: A housing component defining an area for accommodating a battery pack, the battery pack comprising multiple individual cells connected in series and / or parallel; and A cover assembly fitted to the open end of the housing member, the cover assembly comprising: An integrated cover plate is connected to the housing component and is provided with multiple connecting pieces that connect to individual battery cells; A protective plate is installed on the integrated cover plate and is provided with a connecting electrode plate that is connected to the connecting piece. An electrode post is provided on the outer end face of the protective plate. The upper cover component has a groove at the pole position.

[0009] Furthermore, the bottom wall of the housing component is provided with limiting hole structures for limiting the installation of individual cells, and the number of limiting hole structures is not less than the number of individual cells contained in the battery pack.

[0010] Furthermore, the bottom wall of the shell component is provided with a plurality of reinforcing fixing structures extending along the height direction of the shell component, and the reinforcing fixing structure is provided with a first mounting hole. The integrated cover plate is provided with a connecting ear at the corresponding position of the reinforcing fixing structure, and the connecting ear is provided with a second mounting hole that matches the first mounting hole.

[0011] Furthermore, the groove is provided with sealing foam to seal the pole.

[0012] Furthermore, the contact surface between the upper cover component and the housing component is provided with a groove for accommodating sealant.

[0013] Furthermore, the upper cover component and the shell component are sealed together by ultrasonic and thermal fusion methods.

[0014] Furthermore, a lifting groove is provided on the outer end face of the upper cover component, and a lifting structure is arranged in the lifting groove.

[0015] Furthermore, the power battery pack also includes a heating element disposed between the protection plate and the upper cover component, and the protection plate is provided with a control port for the heating element.

[0016] Furthermore, the protective board is equipped with a Bluetooth module.

[0017] Furthermore, the ratio of the height of a single cell to the height of the casing structure is 0.7 to 0.95. Attached Figure Description

[0018] Figure 1 This is a schematic diagram illustrating the conversion between a separate battery pack and a single integrated battery pack. Figure 2 This is a schematic diagram of the arrangement of individual cells in the power battery pack of this application; Figure 3 This is an exploded view of the power battery pack; Figure 4 This is a schematic diagram of the battery pack; Figure 5 A schematic diagram for calculating the safety utilization factor; Figure 6 This is a top view of the interior of the shell component; Figure 7 Schematic diagram of integrated cover plate and protective plate; Figure 8 Schematic diagram of the upper cover component Figure 1 ; Figure 9 Schematic diagram of the upper cover component Figure 2 .

[0019] In the picture: 1-1. Top cover component; 1-2. Integrated cover plate; 1-3. Battery pack; 1-4. Housing component; 1-5. Protective plate; 1-6. Heating element; 1-7. Sealing foam; 2-1. Single cell; 4-1. Exhaust area; 4-2. Reinforcing and fixing structure; 4-2-1. First mounting hole; 4-3. Notch; 4-4. Ventilation area; 4-5. Limiting hole structure; 5-1. Second mounting hole; 5-2. Connecting ear; 5-3. Connecting piece; 5-4. Positioning post; 5-5. Fixing post; 5-6. Wire harness clip; 5-7. Fixing hole; 5-8. Connecting electrode plate; 5-9. Electrode post; 6-1. Glue groove; 6-2. Reinforcing rib; 7-1, Lifting groove; 7-2, Identification features; 7-3, Groove. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] A power battery pack includes a housing structure whose dimensions are adapted to the dimensions of a selected lead-acid battery, and the dimensions of the housing structure are configured to accommodate multiple standard lead-acid battery assembly dimensions (see reference). Figure 1This means the design has changed from a separate unit to a single unit. Specifically, the height of the casing structure is adapted to the size of a standard lead-acid battery, the length of the casing components is adapted to the length of a standard lead-acid battery, and the width of the casing components is N times the width of the standard lead-acid battery, or the width of the casing components is adapted to the width of a standard lead-acid battery, and the length of the casing components is N times the length of the standard lead-acid battery, where N is a positive integer greater than or equal to 2. In some examples, taking a standard lead-acid battery size of 77*181*170mm as an example, the spliced ​​size of three standard lead-acid batteries is 231*181*170mm. At this size, the casing structure perfectly matches most lead-acid battery application scenarios. For example, taking a 20Ah cylindrical cell as an example, a maximum of 24 cells can be arranged to form a 76.8V 20Ah battery; at the same time, the number of cells can be reduced to form battery packs of 73.6V 20Ah, 64V 20Ah, etc. 1-3. The splicing dimensions of two standard lead-acid batteries are 154*181*170mm, and a maximum of 16 cells can be arranged to form a 51.2V 20Ah battery pack 1-3. At the same time, one cell can be reduced to form a 48V 20Ah battery pack 1-3 (refer to...). Figure 2 In conjunction with most lead-acid batteries on the market, in some other examples, the standard 12V 32Ah lead-acid battery has a size of 267*77*170mm (lithium battery is 12.8V 60Ah). Based on the splicing scheme design in this application, it can be used to form batteries with sizes of 38.4V 60Ah (size 231*267*170mm) and 25.6V 60Ah (size 154*267*170mm).

[0022] Reference Figure 3 and combined Figure 4 The aforementioned housing structure includes housing components 1-4 and a cover assembly assembled at the open end (upper end) of housing components 1-4. Housing components 1-4 define an area for accommodating the battery pack 1-3. In some examples, the battery pack 1-3 is composed of multiple battery cells arranged along the length of housing components 1-4, and each battery cell is composed of multiple individual batteries 2-1 spaced along the width of housing components 1-4. In this case, in the dimensional design of the power battery housing structure, if the required replacement lead-acid battery... The length, width, and height of the battery are a, b, and c, respectively. The wall thickness d of the internal battery pack 1-3 is generally 1-3 mm. Then, the cross-sectional area of ​​the internal space where the battery pack 1-3 is placed is S1 = (a-2d)*(b-2d). Assuming that the total voltage of the selected lead-acid battery is V1 and the capacity is H1, and the nominal voltage of the single cell 2-1 in the battery pack 1-3 is V2 and the capacity is H2, then the number of cells in series is e = V1 / V2, and the number of cells in parallel is f = H1 / H2. Correspondingly, the number of single cells 2-1 contained in the battery pack 1-3 is g = e*f.

[0023] Meanwhile, the battery packs for electric two-wheelers fall under the category of small power batteries. Small power batteries require a cross-sectional area safety utilization factor (k) within the range of 0.7 to 0.99. The specific calculation method for the cross-sectional area safety utilization factor is as follows: Where l is the sum of the cross-sectional area of ​​the single cell 2-1 and the area of ​​the safety extension surface. It should be noted that the cross-sectional area of ​​the single cell 2-1 specifically refers to its horizontal cross-sectional area, i.e., the cross-sectional area parallel to the direction of the battery pack cover; the safety extension surface area refers to the area extending outward from the interface surrounding the single cell 2-1. Furthermore, the design requires that the ratio of the safety extension surface area to the cross-sectional area of ​​the single cell 2-1 be less than or equal to 0.05. For example, using… Figure 5 Taking a cylindrical battery as an example, cell 2-1 in the diagram represents a cylindrical single cell 2-1. Figure 5 This is represented as the cross-sectional area of ​​the casing structure and the cylindrical battery along the horizontal direction. In this case, the safe extended surface area of ​​the single cell 2-1 refers to the cross-section of the cylindrical single cell 2-1 extending along the diameter to the dashed circle in the diagram. The annular cross-section formed by the combination of the dashed and solid circles is called the safe extended surface area of ​​the single cell 2-1. In summary, the above-mentioned l=π(r1+r2) 2 Where r1 represents the diameter of the single cell 2-1, and r2 (hereinafter referred to as the safety distance) represents the difference between the dashed circle and the solid circle, which is generally in the range of 0.1 to 10 mm. In this case, the value of r2 is in the range of 0.5 to 6 mm. Meanwhile, in this application, the height of the casing structure is c, and the overall height of the cover assembly is c1. Then, the height s2 for placing the cylindrical battery is s2 = c - c1. The design requires that the ratio of the height of the cylindrical battery to the height for placing the cylindrical battery be between 0.7 and 0.95, that is, the ratio of the height of the single battery to the height of the casing structure is 0.7 to 0.95, preferably 0.75 to 0.9.

[0024] Continue to refer to Figure 6The bottom wall of the aforementioned housing component 1-4 is provided with limiting hole structures 4-5 for mounting and limiting individual battery cells 2-1, and the number of limiting hole structures 4-5 is not less than the number of individual battery cells 2-1 included in the battery pack 1-3, so that the arrangement of individual battery cells 2-1 can be reduced as needed. For example, in the case where a maximum of 24 cells can be arranged to form a 76.8V20Ah battery, the number of cells can be reduced to form battery packs 1-3 such as 73.6V20Ah and 64V20Ah. At the same time, the aforementioned limiting hole structures 4-5 are provided with limiting hole structures 4-5 for mounting and limiting individual battery cells 2-1. The bottom wall of battery 5 and the bottom surface of the single cell 2-1 are spaced to form a venting area 4-4. For a single cell, a gap 4-3 is formed between the limiting hole structure 4-5 of adjacent single cells 2-1. The limiting hole structure 4-5 located at one end of the cell extends outward to form an exhaust area 4-1. When gas is generated in the single cell 2-1, the generated gas will be discharged through the venting area 4-4 and the gap 4-3 into the exhaust area 4-1, which greatly reduces the safety risk caused by gas generation in the power battery.

[0025] Continue to refer to Figure 6 The bottom wall of the aforementioned shell component 1-4 is also provided with a reinforcing fixing structure 4-2 extending along the height direction of the shell component 1-4. The position of the reinforcing fixing structure 4-2 is staggered from the position of the limiting hole structure 4-5. For example, the reinforcing fixing structure 4-2 is provided adjacent to the side wall of the shell component 1-4, and the reinforcing fixing structure 4-2 is provided with a first mounting hole 4-2-1 extending along the height direction of the shell component 1-4. While reinforcing the shell component 1-4, it simplifies the subsequent installation and fixing of the integrated cover plate 1-2.

[0026] Reference Figure 1 and combined Figure 7The aforementioned cover assembly includes an integrated cover plate 1-2, a protective plate 1-5, and an upper cover component 1-1. The integrated cover plate 1-2 is connected to the housing component 1-4 via bolts or other fasteners. Specifically, the integrated cover plate 1-2 has a bracket, which has a triangular connecting lug 5-2 at a corresponding position on the reinforcing fixing structure 4-2 on the housing component 1-4. The connecting lug 5-2 has a second mounting hole 5-1 corresponding to the first mounting hole 4-2-1 on the reinforcing fixing structure 4-2. Based on the synergistic action of the bolts or other fasteners, the first mounting hole 4-2-1, and the second mounting hole 5-1... This allows for the connection between the integrated cover plate 1-2 and the housing component 1-4. Referring to Figure 7, the integrated cover plate 1-2 is provided with multiple connecting pieces 5-3. For example, the integrated cover plate 1-2 is provided with positioning posts 5-4 that mate with the holes on the connecting pieces 5-3. At this time, the connecting pieces 5-3 are fixed to the integrated cover plate 1-2 by means of hot riveting or other methods, and are welded to the individual battery 2-1. The series and parallel connection between the individual batteries 2-1 is realized based on the connecting pieces 5-3. At the same time, the integrated cover plate 1-2 is also provided with wire harness buckles 5-6 for fixing the acquisition wire harnesses led out from the battery pack 1-3.

[0027] The aforementioned protection board 1-5 constitutes the control terminal of the power battery, i.e., it is equipped with the power battery control circuit. Based on this control circuit, parameters such as voltage and temperature in the power battery can be monitored, and the on / off state of the high-voltage circuit of battery pack 1-3 and the safety protection of battery pack 1-3 can be controlled through built-in program logic. For example, the aforementioned protection board 1-5 has control functions such as overcharge protection, over-discharge protection, overcurrent protection, over-temperature protection, charging current limiting, discharging current limiting, and equalization. In some examples, the aforementioned protection board 1-5 is equipped with a Bluetooth module, which can connect to a mobile phone to monitor the relevant real-time data of the battery pack online. In some embodiments, refer to Figure 1 and combined Figure 7The protective plate 1-5 is disposed between the integrated cover plate 1-2 and the upper cover component 1-1, and is installed on the integrated cover plate 1-2. In some embodiments, the upper surface of the integrated cover plate 1-2 is provided with a fixing post 5-5 with a threaded hole structure. Correspondingly, the protective plate 1-5 is provided with a fixing hole 5-7 for the fixing post 5-5 to pass through. The fixing post 5-5 and the fixing hole 5-7 cooperate to realize the connection between the integrated cover plate 1-2 and the protective plate 1-5. At the same time, the protective plate 1-5 is provided with a connecting electrode 5-8. The connecting electrode 5-8 is connected to the connecting piece 5-3 on the integrated cover plate 1-2 by bolt high pressure. Referring to FIG. 7, the outer end face of the protective plate 1-5 is integrated with a pole post 5-9. Exemplarily, the pole post 5-9 can be fixed on the protective plate 1-5 by means of soldering or other methods. The pole post 5-9 constitutes a connector between the power battery and external components. The battery pack 1-3 can be connected in series by means of wire harness or busbar to form a discharge circuit.

[0028] The aforementioned cover component 1-1 is made of a material such as metal or rubber, see reference. Figure 8 The inner end face of the upper cover component 1-1 (i.e., the end face facing the integrated cover plate 1-2) is provided with a reinforcing rib 6-2 structure. Correspondingly, the outer end face of the upper cover component 1-1 is provided with a lifting groove 7-1 to accommodate lifting structures such as handles or nylon straps. Figure 9 The aforementioned upper cover component 1-1 has a groove 7-3 at the corresponding position of the pole 5-9, and a sealing foam 1-7 is arranged at the groove 7-3 to seal the pole 5-9. In some embodiments, the upper cover is coated with sealant of different colors (e.g., red and blue) at different positions of the pole 5-9 for the positive and negative electrode marking features 7-2, while referring to... Figure 8 In some examples, the upper cover component 1-1 is provided with a glue groove 6-1 for accommodating sealant at the connection position with the shell component 1-4, so as to achieve a connection seal between the upper cover component 1-1 and the shell component 1-4. In other examples, the upper cover component 1-1 and the shell component 1-4 are sealed and connected by ultrasonic or heat fusion methods.

[0029] In some embodiments, the power battery further includes a heating element 1-6 disposed between the upper cover component 1-1 and the protective plate 1-5, and the heating element 1-6 is bolted to the integrated cover plate 1-2. Meanwhile, the protective plate 1-5 has a heating control interface. When the power battery is used in a low-temperature environment, the heating element can heat the individual cells 2-1 in the power battery to improve the charging and discharging efficiency of the cells.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A power battery pack, characterized in that, The device includes a housing structure, the height of which is adapted to the height of a standard lead-acid battery, and the length of the housing component is adapted to the length of a standard lead-acid battery and the width of the housing component is N times the width of the standard lead-acid battery, or the width of the housing component is adapted to the width of a standard lead-acid battery and the length of the housing component is N times the length of the standard lead-acid battery, where N≥2 and is a positive integer.

2. The power battery pack according to claim 1, characterized in that: N is 2 or 3.

3. A power battery pack according to claim 1, characterized in that: The ratio of the capacity of the power battery pack to the capacity of the standard lead-acid battery is greater than or equal to 1.

5.

4. A power battery pack according to claim 1, characterized in that: The shell structure includes: A housing component (1-4) defines an area for accommodating a battery pack (1-3), the battery pack (1-3) comprising a plurality of individual cells (2-1) connected in series and / or parallel; and A cover assembly fitted to the open end of the housing member (1-4), the cover assembly comprising: An integrated cover plate (1-2) is connected to the housing component (1-4) and is provided with multiple connecting pieces (5-3) that are connected to the individual battery cells (2-1). The protective plate (1-5) is installed on the integrated cover plate (1-2) and is provided with a connecting electrode (5-8) connected to the connecting piece (5-3), and an electrode post (5-9) is provided on the outer end face of the protective plate (1-5). The upper cover component (1-1) has a groove (7-3) at the position of the pole post (5-9).

5. A power battery pack according to claim 4, characterized in that: The bottom wall of the housing component (1-4) is provided with a limiting hole structure (4-5) for limiting the installation of individual cells (2-1), and the number of limiting hole structures (4-5) is not less than the number of individual cells (2-1) included in the battery pack (1-3).

6. A power battery pack according to claim 4, characterized in that: The bottom wall of the shell component (1-4) is provided with a plurality of reinforcing fixing structures (4-2) extending along the height direction of the shell component (1-4), and the reinforcing fixing structure (4-2) is provided with a first mounting hole (4-2-1). The integrated cover plate (1-2) is provided with a connecting ear (5-2) at the corresponding position of the reinforcing fixing structure (4-2), and the connecting ear (5-2) is provided with a second mounting hole (5-1) that is adapted to the first mounting hole (4-2-1).

7. A power battery pack according to claim 4, characterized in that: The groove (7-3) is provided with sealing foam (1-7) to seal the pole (5-9).

8. A power battery pack according to claim 4, characterized in that: The contact surface between the upper cover component (1-1) and the shell component (1-4) is provided with a sealant groove (6-1) for accommodating sealant.

9. A power battery pack according to claim 4, characterized in that: The upper cover component (1-1) and the shell component (1-4) are sealed together by ultrasonic and heat fusion methods.

10. A power battery pack according to claim 4, characterized in that: The outer end face of the upper cover component (1-1) is provided with a lifting groove (7-1), and the lifting groove (7-1) contains a lifting structure.

11. A power battery pack according to claim 4, characterized in that: The power battery pack also includes a heating element (1-6) disposed between the protection plate (1-5) and the upper cover component (1-1), and the protection plate (1-5) is provided with a control port for the heating element (1-6).

12. A power battery pack according to claim 4, characterized in that: The protective panel (1-6) is equipped with a Bluetooth module.

13. A power battery pack according to claim 4, characterized in that: The ratio of the height of the single cell (2-1) to the height of the casing structure is 0.7 to 0.95.

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