Battery management system and battery

Abstract

The utility model provides a battery management system and a battery, the battery management system comprises a power distribution assembly arranged in a battery shell, the power distribution assembly is provided with a main loop and a fast charging loop, the main loop comprises a main positive loop provided with a main positive contactor and a main negative loop provided with a main negative contactor, and the fast charging loop is provided with a fast charging loop. The fast charging loop comprises a fast charging positive contactor connected with the main positive contactor in parallel and a fast charging negative contactor connected with the main negative contactor in parallel. The battery management system provided by the utility model can solve the problem of large energy consumption caused by simultaneous working of the contactors, so that the operation stability of the contactors can be ensured, and the cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery management system. At the same time, the utility model also relates to a battery provided with the battery management system. Background Art

[0002] The battery management system is an important part of an electric vehicle.

[0003] In the existing battery management system, the high-voltage architectures of the working circuit and the fast-charging circuit adopt a series form. When fast charging is carried out, the main positive and negative contactors and the fast-charging main and negative contactors will work simultaneously, consuming a large amount of energy, which is not conducive to ensuring the stability of the operation of each contactor. At the same time, due to the large energy consumption, contactors of a larger model need to be selected, and usually, the cost required for contactors of a larger model is relatively high, which is not conducive to cost reduction. Summary of the Utility Model

[0004] In view of this, the utility model aims to provide a battery management system to ensure the stability of the operation of each contactor and facilitate cost reduction.

[0005] To achieve the above object, the technical solution of the utility model is realized as follows:

[0006] A battery management system includes a power distribution component disposed inside a battery housing.

[0007] The power distribution component has a main circuit and a fast-charging circuit. The main circuit includes a main positive circuit provided with a main positive contactor and a main negative circuit provided with a main negative contactor. The fast-charging circuit includes a fast-charging positive contactor connected in parallel with the main positive contactor and a fast-charging negative contactor connected in parallel with the main negative contactor.

[0008] Further, a first installation area, a second installation area, and a third installation area are sequentially arranged on the battery housing along its length direction; the fast-charging positive contactor and the fast-charging negative contactor are disposed in the first installation area, the main positive contactor and the main negative contactor are disposed in the third installation area, and the second installation area is used for installing a battery cell module.

[0009] Further, the fast-charging positive contactor and the fast-charging negative contactor are spaced apart along the width direction of the battery housing.

[0010] Further, each of the fast-charging positive contactor and the fast-charging negative contactor includes a fast-charging contactor main body and a protective cover disposed on the fast-charging contactor main body, and a collection terminal on the fast-charging contactor main body is located in the inner cavity of the protective cover.

[0011] Further, the protective cover includes a lower cover body provided on the fast charging contactor main body, and an upper cover body snap-fitted on the lower cover body, and the inner cavity is formed between the lower cover body and the upper cover body.

[0012] Further, the lower cover body and the upper cover body are snap-connected; and / or, the lower cover body and the fast charging contactor main body are screwed together.

[0013] Further, the collecting terminal is L-shaped.

[0014] Further, the bottom and side of the fast charging contactor main body are connected to the battery housing through a thermally conductive structural adhesive layer; and / or, the battery housing is made of aluminum material.

[0015] Further, the power distribution component includes a pre-charging contactor and a pre-charging resistor connected in series, and the main positive contactor and the fast charging positive contactor are both connected in parallel with the pre-charging contactor and the pre-charging resistor connected in series.

[0016] Compared with the prior art, the utility model has the following advantages:

[0017] In the battery management system of the utility model, by setting the main positive contactor and the main negative contactor in the main circuit, and the fast charging positive contactor and the fast charging negative contactor in the fast charging circuit, and connecting the main positive contactor and the fast charging positive contactor in parallel, and the main negative contactor and the fast charging negative contactor in parallel, so that the operation of each contactor does not affect each other, which is beneficial to ensuring the stability of the operation of each contactor, and can also reduce energy consumption, which is beneficial to reducing the type selection requirements of the contactor, thereby facilitating cost reduction.

[0018] Secondly, by setting the first installation area, the second installation area and the third installation area, it is convenient to realize the split design of the fast charging positive and negative contactors and the main positive and negative contactors, which is beneficial to improving the heat dissipation efficiency and facilitating subsequent maintenance. The fast charging positive contactor and the fast charging negative contactor are arranged at intervals, which can further improve the heat dissipation efficiency while improving the stability of the fast charging positive contactor and the fast charging negative contactor during operation. By setting a protective cover on the fast charging contactor main body, the protection level of the contactor main body can be improved, preventing damage to the fast charging contactor main body by external factors, and setting the collecting terminal in the inner cavity of the protective cover can reduce the risk of operators directly contacting the live part, thereby improving the operation safety.

[0019] Furthermore, the protective cover adopts a split design, with the upper cover body buckled on the lower cover body, which facilitates subsequent maintenance and repair, thus helping to improve work efficiency. At the same time, the inner cavity can protect the inside of the protective cover from the external environment. The snap connection design between the lower cover body and the upper cover body helps to reduce the operation difficulty, making it convenient for maintenance and replacement. Moreover, the lower cover body is screwed to the main body of the fast charging contactor, which can enhance the connection strength between the two, thereby improving the overall stability of the device. The collection terminal is set to be L-shaped, which is convenient for the installation of the collection terminal. At the same time, it can also extend the service life of the collection terminal itself and improve the connection reliability between the collection wire and the collection terminal.

[0020] In addition, both the bottom and side of the main body of the fast charging contactor are connected to the battery housing through a thermally conductive structural adhesive layer, which can enhance the connection strength between the main body of the fast charging contactor and the battery housing while improving the heat dissipation efficiency of the main body of the fast charging contactor. At the same time, the battery housing is made of aluminum material, which can further improve the heat dissipation effect. By setting a series-connected pre-charging contactor and a pre-charging resistor, and making the main positive contactor and the fast charging positive contactor both in parallel with the series-connected pre-charging contactor and pre-charging resistor, the architecture can be simplified, which is conducive to cost reduction.

[0021] Another object of the present utility model is to propose a battery, in which the battery management system as described above is adopted.

[0022] The battery of the present utility model and the above-mentioned battery management system have the same beneficial effects as compared with the traditional technology, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model. In the drawings:

[0024] Figure 1 is a schematic diagram of the overall structure of the battery management system according to an embodiment of the present utility model;

[0025] Figure 2 is Figure 1 an enlarged view of the structure shown at A in

[0026] Figure 3 is Figure 1 an enlarged view of the structure shown at B in

[0027] Figure 4 is a schematic diagram of a partial structure of the battery management system according to an embodiment of the present utility model;

[0028] Figure 5 is an assembly drawing between the main body of the fast charging contactor and the battery housing according to an embodiment of the present utility model;

[0029] Figure 6 Explosion diagram of the protective cover described in the embodiment of the present utility model;

[0030] Figure 7 is Figure 6 Enlarged view of the structure shown at position C in

[0031] Figure 8 Schematic diagram of the battery management system described in the embodiment of the present utility model;

[0032] Description of reference numerals:

[0033] 1. Battery housing; 11. First installation area; 12. Second installation area; 121. Cell module; 13. Third installation area;

[0034] 2. Power distribution component; 21. Main circuit; 211. Main positive contactor; 212. Main negative contactor; 22. Fast charging circuit; 220a. Fast charging positive contactor; 220b. Fast charging negative contactor; 221. Fast charging contactor body; 222. Protective cover; 2221. Upper cover body; 22211. Long strip groove; 2222. Lower cover body; 22221. Snap projection; 2223. Acquisition terminal; 22231. Plug-in end; 22232. Fixed end; 2224. Copper busbar; 23. Pre-charge contactor; 24. Pre-charge resistor; 25. Fuse; 26. Current sensor;

[0035] 3. Thermal conductive structural adhesive layer. Specific implementation manners

[0036] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0037] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, if terms such as "first" and "second" appear, they are also only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0038] Taking the battery housing shown in the battery management system described in the present utility model as an example, the orientation terms such as "upper, lower, left, right, front, back" used in the embodiment are based on Figure 1 shown in Figure 1It is defined based on the up-down direction (also known as the height direction or the overall package Z direction), left-right direction (also known as the width direction or the overall package Y direction), and front-back direction (also known as the length direction or the overall package X direction) in the shown state. "Inside and outside" are defined based on the contour of the corresponding component. For example, "inside" and "outside" defined based on the contour of the battery pack, with the side where the middle crossbeam is located being "inside" and the opposite being "outside".

[0039] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installed", "connected", "connected", and "connector" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0040] The present utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0041] Embodiment 1

[0042] This embodiment relates to a battery management system, which can solve the problem of large energy consumption caused by the simultaneous operation of each contactor, is beneficial to ensuring the stability of the operation of each contactor, and is beneficial to cost reduction. In terms of the overall structure, as Figures 1 to 8 shown, the battery management system of this embodiment includes a power distribution component 2 provided in the battery housing 1.

[0043] Among them, the power distribution component 2 has a main circuit 21 and a fast charging circuit 22. The main circuit 21 includes a main positive circuit provided with a main positive contactor 211 and a main negative circuit provided with a main negative contactor 212. The fast charging circuit 22 includes a fast charging positive contactor 220a connected in parallel with the main positive contactor 211 and a fast charging negative contactor 220b connected in parallel with the main negative contactor 212.

[0044] At this time, with the above settings, through the settings of the main positive contactor 211 and the main negative contactor 212 in the main circuit 21, and the fast charging positive contactor 220a and the fast charging negative contactor 220b in the fast charging circuit 22, and making the main positive contactor 211 connected in parallel with the fast charging positive contactor 220a, and the main negative contactor 212 connected in parallel with the fast charging negative contactor 220b, it can enable the operation of each contactor not to affect each other, is beneficial to ensuring the stability of the operation of each contactor, and can also reduce energy consumption, which is beneficial to reducing the selection requirements of the contactor, thereby facilitating cost reduction.

[0045] Based on the above overall introduction, in this embodiment, as a preferred implementation form, referring to Figure 1 、 Figure 2 andFigure 3 As shown in Figure 3 , on the battery housing 1, a first mounting area 11, a second mounting area 12, and a third mounting area 13 are arranged in sequence along its own length direction.

[0046] Moreover, the fast - charge positive contactor 220a and the fast - charge negative contactor 220b are arranged in the first mounting area 11, the main positive contactor 211 and the main negative contactor 212 are arranged in the third mounting area 13, and the second mounting area 12 is used to mount the battery cell module 121. Here, by setting the first mounting area 11 and the third mounting area 13, it is convenient to realize the split design of the fast - charge positive and negative contactors and the main positive and negative contactors, which is beneficial to improving the heat dissipation efficiency and facilitating subsequent maintenance.

[0047] Specifically, in this embodiment, as a preferred implementation form, continue to refer to Figure 2 As shown in Figure 2 , the fast - charge positive contactor 220a and the fast - charge negative contactor 220b are arranged at intervals along the width direction of the battery housing 1. With this arrangement, while further improving the heat dissipation efficiency, the stability of the fast - charge positive contactor 220a and the fast - charge negative contactor 220b during operation can be improved.

[0048] And, in this embodiment, as a preferred implementation form, as shown in Figure 5 、 Figure 6 and Figure 7 As shown in Figure 7 , both the fast - charge positive contactor 220a and the fast - charge negative contactor 220b include a fast - charge contactor main body 221, and a protective cover 222 arranged on the fast - charge contactor main body 221. The acquisition terminal 2223 on the fast - charge contactor main body 221 is located in the inner cavity of the protective cover 222.

[0049] The advantage of this setting is that by setting the protective cover 222 on the fast - charge contactor main body 221, the protection level of the contactor main body can be improved, preventing damage to the fast - charge contactor main body 221 by external factors, and setting the acquisition terminal 2223 in the inner cavity of the protective cover 222 can reduce the risk of operators directly contacting the live part, thus improving the operation safety.

[0050] It should still be noted that the fast - charge positive contactor 220a and the fast - charge negative contactor 220b in this embodiment can both adopt the contactor structures well - known to those skilled in the art. For example, the structures of the fast - charge positive contactor 220a and the fast - charge negative contactor 220b are basically similar, and the main differences lie in their installation positions and functions in the fast - charge circuit 22, etc.

[0051] In addition, as a preferred implementation form, as shown in Figure 6As shown in the figure, the protective cover 222 of this embodiment includes a lower cover body 2222 provided on the fast charging contactor main body 221, and an upper cover body 2221 buckled on the lower cover body 2222, and the inner cavity is formed between the lower cover body 2222 and the upper cover body 2221.

[0052] It can be understood that the protective cover 222 adopts a split design, with the upper cover body 2221 buckled on the lower cover body 2222, which is convenient for subsequent maintenance and repair, thus helping to improve work efficiency. At the same time, the setting of the inner cavity can protect the inside of the protective cover 222 from the external environment.

[0053] Meanwhile, in this embodiment, as a preferred implementation form, referring to Figure 4 and Figure 5 as shown in the figure, the lower cover body 2222 and the upper cover body 2221 are connected by snap connection, and the lower cover body 2222 and the fast charging contactor main body 221 are connected by screwing. Here, the snap connection design between the lower cover body 2222 and the upper cover body 2221 is conducive to reducing the operation difficulty, facilitating maintenance and replacement, and the screwing connection between the lower cover body 2222 and the fast charging contactor main body 221 can improve the connection strength between the two, thereby improving the overall stability of the device.

[0054] It is worth mentioning that a copper busbar 2224 is also provided in the inner cavity of the protective cover 222 of this embodiment, and a fuse 25 and a current sensor 26 are connected in series between the battery cell module 121 and the main positive contactor 211. Of course, for the related structural parts of each contactor not mentioned in this embodiment, the structures of the contactors well-known to those skilled in the art can be referred to, and details will not be elaborated here.

[0055] During specific implementation, the lower cover body 2222 is provided with a snap projection 22221, and the upper cover body 2221 is provided with a long slot 22211 extending downward along the height direction of the battery housing 1. The upper cover body 2221 is snap-connected to the lower cover body 2222 by the long slot 22211 being snap-connected to the snap projection 22221. And when the lower cover body 2222 is screwed to the fast charging contactor main body 221, a bolt can pass through the copper busbar 2224 and the lower cover body 2222 from top to bottom and then be screwed tightly to the fast charging contactor main body 221, thereby improving the connection stability between the lower cover body 2222 and the fast charging contactor main body 221.

[0056] Moreover, considering the connection requirements of the acquisition terminal 2223, in this embodiment, as a preferred implementation form, referring to the figure shown, the acquisition terminal 2223 is L-shaped. Thus, setting the acquisition terminal 2223 to be L-shaped is convenient for the installation of the acquisition terminal 2223, and at the same time can also improve the service life of the acquisition terminal 2223 itself and the connection reliability between the acquisition line and the acquisition terminal 2223.

[0057] In the specific structure, the acquisition terminal 2223 includes a plug-in end 22231 arranged along the height direction of the battery housing 1, and a fixed end 22232 connected to the plug-in end 22231. The fixed end 22232 is arranged along the length direction of the battery housing 1. During specific implementation, the fixed end 22232 is welded to the copper bar 2224 to install the acquisition terminal 2223. Of course, in addition to the welding form, other common connection forms can also be used, such as screwing, etc.

[0058] In addition, in this embodiment, as a preferred implementation form, as Figure 5 shown, the bottom and side of the fast charging contactor body 221 are both connected to the battery housing 1 through the thermal conductive structural adhesive layer 3. With this setting, while improving the connection strength between the fast charging contactor body 221 and the battery housing 1, the heat dissipation efficiency of the fast charging contactor body 221 can be improved. At the same time, the battery housing 1 is made of aluminum material, which can further improve the heat dissipation effect.

[0059] In addition, as a preferred implementation form, as Figure 8 shown, in this embodiment, the power distribution component 2 includes a series-connected pre-charging contactor 23 and a pre-charging resistor 24, and the main positive contactor 211 and the fast charging positive contactor 220a are both connected in parallel with the series-connected pre-charging contactor 23 and pre-charging resistor 24.

[0060] Thus, by setting the series-connected pre-charging contactor 23 and pre-charging resistor 24, and making the main positive contactor 211 and the fast charging positive contactor 220a both connected in parallel with the series-connected pre-charging contactor 23 and pre-charging resistor 24, the architecture can be simplified, which is beneficial to cost reduction.

[0061] Here, it should be noted that the main positive contactor and the main negative contactor in this embodiment, as well as some structures not mentioned in the main circuit and the fast charging circuit in this embodiment, such as electrical components like resistors, can all adopt the relevant structural parts common in the existing power distribution box.

[0062] In summary, the battery management system of this embodiment precisely adopts the above design, making the main positive contactor 211 and the fast charging positive contactor 220a connected in parallel, and the main negative contactor 212 and the fast charging negative contactor 220b connected in parallel, so that the operation of each contactor does not affect each other, which is beneficial to ensuring the stability of the operation of each contactor, and can also reduce energy consumption, which is beneficial to reducing the selection requirements of the contactors, thereby facilitating cost reduction. And, a thermal conductive structural adhesive layer 3 is provided at both the bottom and side of the fast charging contactor body 221. Thus, while improving the connection strength between the fast charging contactor body 221 and the battery housing 1, the heat dissipation efficiency can be improved.

[0063] Embodiment Two

[0064] This embodiment relates to a battery, which includes the battery management system in Embodiment 1.

[0065] For the battery of this embodiment, by adopting the battery management system in Embodiment 1, the main positive contactor 211 is connected in parallel with the fast charge positive contactor 220a, and the main negative contactor 212 is connected in parallel with the fast charge negative contactor 220b, so that the operation of each contactor is not affected by each other, which is beneficial to ensuring the stability of the operation of each contactor. It can also reduce energy consumption, which is beneficial to reducing the type selection requirements of the contactor, thereby facilitating cost reduction.

[0066] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery management system, characterized in that: It includes a power distribution component arranged inside the battery case; The power distribution component has a main circuit and a fast charging circuit. The main circuit includes a main positive circuit provided with a main positive contactor and a main negative circuit provided with a main negative contactor. The fast charging circuit includes a fast charging positive contactor connected in parallel with the main positive contactor and a fast charging negative contactor connected in parallel with the main negative contactor.

2. The battery management system according to claim 1, characterized in that: The battery case is provided with a first installation area, a second installation area, and a third installation area arranged in sequence along its length direction; The fast charging positive contactor and the fast charging negative contactor are arranged in the first installation area, the main positive contactor and the main negative contactor are arranged in the third installation area, and the second installation area is used for installing the battery cell module.

3. The battery management system according to claim 2, characterized in that: The fast charging positive contactor and the fast charging negative contactor are arranged at intervals along the width direction of the battery case.

4. The battery management system according to claim 3, characterized in that: Both the fast charging positive contactor and the fast charging negative contactor include a fast charging contactor main body and a protective cover arranged on the fast charging contactor main body. The acquisition terminal on the fast charging contactor main body is located in the inner cavity of the protective cover.

5. The battery management system according to claim 4, characterized in that: The protective cover includes a lower cover body arranged on the fast charging contactor main body and an upper cover body buckled on the lower cover body. The inner cavity is formed between the lower cover body and the upper cover body.

6. The battery management system according to claim 5, characterized in that: The lower cover body and the upper cover body are connected by snap connection; and / or, The lower cover body and the fast charging contactor main body are connected by screwing.

7. The battery management system according to claim 4, characterized in that: The acquisition terminal is L-shaped.

8. The battery management system according to claim 4, characterized in that: The bottom and side of the fast charging contactor main body are both connected to the battery case through a thermally conductive structural adhesive layer; and / or, The battery case is made of aluminum material.

9. The battery management system according to any one of claims 1 to 8, characterized in that: The power distribution component includes a pre-charge contactor and a pre-charge resistor connected in series, and the main positive contactor and the fast charging positive contactor are both connected in parallel with the series-connected pre-charge contactor and pre-charge resistor.

10. A battery, characterized in that: The battery is configured with the battery management system according to any one of claims 1 to 9.

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